PIMCO FUNDS
485BPOS, 1998-07-31
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<PAGE>

      As filed with the Securities and Exchange Commission on July 31, 1998     
                                                              File Nos. 33-12113
                                                                        811-5028

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                 FORM N-1A

            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933      /X/

                        Post-Effective Amendment No. 41                  /X/

                                    and/or

        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940  /X/

                               Amendment No. 45                          /X/

                                  PIMCO FUNDS
                                  -----------
              (Exact Name of Registrant as Specified in Charter)

                           840 Newport Center Drive
                        Newport Beach, California 92660
                        -------------------------------
             (Address of Principal Executive Offices)  (Zip Code)
              Registrant's Telephone Number, including area code)
                                (714) 760-4867

Robert W. Helm, Esq.                   R. Wesley Burns
Dechert Price & Rhoads                 Pacific Investment Management Company
1775 Eye Street, N.W.                  840 Newport Center Drive
Washington, D.C. 20006                 Newport Beach, California 92660

                    (Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

              /X/ Immediately upon filing pursuant to paragraph (b)     

              / / on (date) pursuant to paragraph (b)     

              / / 60 days after filing pursuant to paragraph (a)(1)

              / / on (date) pursuant to paragraph (a)(2) of Rule 485

     If appropriate, check the following box:

              / / This post-effective amendment designates a new effective
                  date for a previously filed post-effective amendment.     

<PAGE>
 
                             CROSS-REFERENCE SHEET
                             REQUIRED BY RULE 495
                       UNDER THE SECURITIES ACT OF 1933


                                    PART A

            Institutional Class and Administrative Class Prospectus

                      Information Required in Prospectus
                      ----------------------------------


    Item Number               Heading
    -----------               -------
                      
       1                      Cover Page
                      
       2                      Prospectus Summary, Expense Information
                      
       3                      Financial Highlights
                      
       4                      Investment Objectives and Policies;
                              Characteristics and Risks of Securities and
                              Investment Techniques; Other Information
                      
       5                      Management of the Trust
                      
       5A                     Not Applicable
                      
       6                      Dividends, Distributions and Taxes;
                              Other Information
                      
       7                      Purchase of Shares; Net Asset Value
                      
       8                      Redemption of Shares
                      
       9                      Not Applicable
<PAGE>
 
                                    PART A

                  Class A, Class B, and Class C Prospectuses

                      Information Required in Prospectus
                      ----------------------------------


      Item Number                Heading
      -----------                -------
                         
         1                       Cover Page
                         
         2                       Schedule of Fees
                         
         3                       Financial Highlights
                         
         4                       Investment Objectives and Policies;
                                 Characteristics and Risks of Securities and
                                 Investment Techniques
                         
         5                       Management of the Trust
                         
         5A                      Not Applicable
                         
         6                       Distributions; Taxes; Description
                                 of the Trust
                         
         7                       How to Buy Shares; Alternative Purchase
                                 Arrangements; Exchange Privilege; Distributor
                                 and Distribution and Servicing Plans; How Net
                                 Asset Value is Determined
                         
         8                       How to Redeem
                         
         9                       Not Applicable
<PAGE>
 
                                    PART A

                             Class D Prospectuses

                      Information Required in Prospectus
                      ----------------------------------


      Item Number                Heading
      -----------                -------
                        
         1                       Cover Page
                        
         2                       Schedule of Fees
                        
         3                       Financial Highlights
                        
         4                       Investment Objectives and Policies;
                                 Characteristics and Risks of Securities and
                                 Investment Techniques
                        
         5                       Management of the Trust
                        
         5A                      Not Applicable
                        
         6                       Distributions; Taxes; Description
                                 of the Trust
                        
         7                       How to Buy Shares; Exchange Privilege;
                                 Distributor; How Net Asset Value is Determined
                        
         8                       How to Redeem
                        
         9                       Not Applicable
<PAGE>
 
                                    PART A

                            PIMCO Total Return Fund
                              Class A Prospectus

                      Information Required in Prospectus
                      ----------------------------------

          Item Number                Heading
          -----------                -------
                              
              1                      Cover Page
                              
              2                      Schedule of Fees
                              
              3                      Financial Highlights
                              
              4                      Investment Objective and Policies;
                                     Characteristics and Risks of Securities
                                     and Investment Techniques
                              
              5                      Management of the Trust
                              
              5A                     Not Applicable
                              
              6                      Distributions; Taxes; Description of
                                     the Trust
                              
              7                      How to Buy Shares; Exchange Privilege;
                                     Distributor and Distribution and
                                     Servicing Plan; How Net Asset Value is
                                     Determined
                              
              8                      How to Redeem
                              
              9                      Not Applicable
<PAGE>
 
                                 PART B

          Information Required in Statement of Additional Information
          -----------------------------------------------------------


      Item Number                Heading
      -----------                -------
                           
         10                      Cover Page
                           
         11                      Table of Contents
                           
         12                      Not Applicable
                           
         13                      Investment Objectives and Policies; Investment
                                 Restrictions
                           
         14                      Trustees and Officers
                           
         15                      Voting Rights
                           
         16                      Management of the Trust; Distribution of Trust
                                 Shares; Custodian, Transfer Agent and Dividend
                                 Disbursing Agent
                           
         17                      Portfolio Transactions and Brokerage
                           
         18                      Other Information
                           
         19                      Distribution of Trust Shares; Net Asset Value
                           
         20                      Taxation
                           
         21                      Distribution of Trust Shares
                           
         22                      Performance Information
                           
         23                      Financial Statements


 
<PAGE>
 
                            PIMCO FUNDS PROSPECTUS



PACIFIC
INVESTMENT
MANAGEMENT
SERIES:
INSTITUTIONAL &
ADMINISTRATIVE 
SHARE CLASSES

AUGUST 1, 1998

SHORT-TERM BOND FUNDS
Money Market Fund                      Low Duration Fund II      
Short-Term Fund                        Low Duration Fund III     
Low Duration Fund                      Low Duration Mortgage Fund 

INTERMEDIATE-TERM BOND FUNDS
Moderate Duration Fund                 Total Return Fund III                
Real Return Bond Fund                  Total Return Mortgage Fund           
Total Return Fund                      Commercial Mortgage Securities Fund  
Total Return Fund II                   High Yield Fund                       

LONG-TERM BOND FUNDS
Long-Term U.S. Government Fund    

INTERNATIONAL BOND FUNDS
Global Bond Fund                       International Bond Fund      
Global Bond Fund II                    Emerging Markets Bond Fund   
Foreign Bond Fund                      Emerging Markets Bond Fund II 

TAX EXEMPT FUNDS
Municipal Bond Fund

STOCK AND BOND FUNDS
Strategic Balanced Fund

STOCK FUNDS
StocksPLUS Fund                        StocksPLUS Short Strategy Fund


                                                           [LOGO OF PIMCO FUNDS]
<PAGE>
 
PIMCO Funds: Pacific Investment Management Series
Prospectus
   
August 1, 1998     
 
PIMCO Funds (the "Trust") is an open-end management investment company
("mutual fund") consisting of twenty-five separate investment portfolios (the
"Funds"). Each Fund has its own investment objective and policies. The Trust
is designed to provide access to the professional investment management
services offered by Pacific Investment Management Company ("PIMCO"), which
serves as investment adviser to the Funds.
 
This Prospectus describes two classes of shares offered by each Fund: the
"Institutional Class" and the "Administrative Class." Through separate
prospectuses, certain Funds may offer up to four additional classes of shares,
Class A, Class B, Class C and Class D shares. See "Other Information--Multiple
Classes of Shares."
 
This Prospectus sets forth concisely the information a prospective investor
should know before investing in the Funds. It should be read and retained for
ready reference to information about the Funds. Information about the
investment objective of each Fund, along with a detailed description of the
types of securities in which each Fund may invest, and of investment policies
and restrictions applicable to each Fund, are set forth in this Prospectus.
There can be no assurance that the investment objective of any Fund will be
achieved. Because the market value of the Funds' investments will change, the
investment returns and net asset value per share of each Fund will vary.
   
A Statement of Additional Information, dated August 1, 1998, as amended or
supplemented from time to time, containing additional and more detailed
information about the Funds, has been filed with the Securities and Exchange
Commission and is hereby incorporated by reference into this Prospectus. The
Securities and Exchange Commission maintains an Internet World Wide Web site
(at www.sec.gov) which contains the Statement of Additional Information,
materials that are incorporated by reference into this Prospectus and the
Statement of Additional Information, and other information about the Funds.
The Statement of Additional Information is available without charge and may be
obtained by writing or calling:     
 
                  PIMCO Funds
                     
                  840 Newport Center Drive, Suite 300     
                  Newport Beach, CA 92660
                  Telephone: (800) 927-4648
                           (800) 987-4626 (PIMCO Infolink Audio Response
                            Network)
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
A CRIMINAL OFFENSE.
 
SHARES OF THE FUNDS ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
ENDORSED BY, ANY FINANCIAL INSTITUTION, AND THE SHARES ARE NOT FEDERALLY
INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE
BOARD, OR ANY OTHER AGENCY, AND ENTAIL RISK, INCLUDING THE POSSIBLE LOSS OF
PRINCIPAL.
 
INVESTMENT IN THE PIMCO MONEY MARKET FUND (OR IN ANY OTHER FUND) IS NEITHER
INSURED NOR GUARANTEED BY THE U.S. GOVERNMENT. THERE CAN BE NO ASSURANCE THAT
THE MONEY MARKET FUND WILL BE ABLE TO MAINTAIN A STABLE NET ASSET VALUE OF
$1.00 PER SHARE.
 
EACH OF THE FUNDS, EXCEPT THE PIMCO MONEY MARKET AND MUNICIPAL BOND FUNDS, MAY
INVEST ALL OF ITS ASSETS IN DERIVATIVE INSTRUMENTS, SOME OF WHICH MAY BE
PARTICULARLY SENSITIVE TO CHANGES IN PREVAILING INTEREST RATES. UNEXPECTED
CHANGES IN INTEREST RATES MAY ADVERSELY AFFECT THE VALUE OF A FUND'S
INVESTMENTS IN PARTICULAR DERIVATIVE INSTRUMENTS.
 
THE PIMCO HIGH YIELD, EMERGING MARKETS BOND AND EMERGING MARKETS BOND II FUNDS
MAY INVEST ALL OF THEIR ASSETS, AND THE PIMCO COMMERCIAL MORTGAGE SECURITIES
FUND MAY INVEST UP TO 35% OF ITS ASSETS, IN JUNK BONDS, WHICH ARE SUBJECT TO
HIGH RISK, AND SPECULATIVE WITH REGARD TO PAYMENT OF INTEREST AND RETURN OF
PRINCIPAL. INVESTORS SHOULD CAREFULLY CONSIDER THESE RISKS BEFORE INVESTING IN
THESE FUNDS. SEE "CHARACTERISTICS AND RISKS OF SECURITIES AND INVESTMENT
TECHNIQUES--HIGH YIELD SECURITIES ("JUNK BONDS")."
 
 1  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
   <S>                                                                      <C>
   Prospectus Summary......................................................   3
   Expense Information.....................................................   7
   Financial Highlights....................................................   9
   Investment Objectives and Policies......................................  15
   Investment Restrictions.................................................  25
   Characteristics and Risks of Securities and Investment Techniques.......  28
   Management of the Trust.................................................  46
   Purchase of Shares......................................................  49
   Redemption of Shares....................................................  52
   Portfolio Transactions..................................................  54
   Net Asset Value.........................................................  55
   Dividends, Distributions and Taxes......................................  56
   Other Information.......................................................  58
   Appendix A -- Description of Duration................................... A-1
   Appendix B -- Description of Securities Ratings......................... B-1
</TABLE>    
 
                                                    August 1, 1998 Prospectus  2
<PAGE>
 
                               PROSPECTUS SUMMARY
 
 
  PIMCO Funds (the "Trust") is an open-end management investment company
("mutual fund") organized as a Massachusetts business trust on February 19,
1987. The Trust consists of twenty-five separate investment portfolios (the
"Funds"). The following chart provides general information about each of the
PIMCO Funds. It is qualified in its entirety by the more complete descriptions
of the Funds appearing elsewhere in this Prospectus.
 
<TABLE>   
SHORT-TERM BOND      PRIMARY INVESTMENTS                                        DURATION     CREDIT QUALITY(1) FOREIGN(2)
FUNDS
- -------------------------------------------------------------------------------------------------------------------------
<S>                  <C>                                                        <C>          <C>               <C>
Money Market         Money market instruments                                   less than    Min 95% Aaa or    0%
                                                                                or equal     Prime 1; less 
                                                                                to 90 days   than or equal 
                                                                                dollar-      to 5% Aa or 
                                                                                weighted     Prime 2      
                                                                                average                      
                                                                                maturity                     
- -------------------------------------------------------------------------------------------------------------------------
Short-Term           Money market instruments and short maturity fixed          0-1 yr       B to Aaa; max     0-5%
                     income securities                                                       10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Low Duration         Short and intermediate maturity fixed income securities    1-3 yrs      B to Aaa; max     0-20%
                                                                                             10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Low Duration II      Same as Low Duration Fund, except quality and foreign      1-3 yrs      A to Aaa          0%
                     issuer restrictions
- -------------------------------------------------------------------------------------------------------------------------
Low Duration III     Same as Low Duration Fund, except prohibitions on          1-3 yrs      B to Aaa; max     0-20%
                     firms engaged in socially sensitive practices                           10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Low Duration         Short and intermediate maturity mortgage-related           1-3 yrs      Baa to Aaa; max   0%
Mortgage             securities                                                              10% below Aaa
- -------------------------------------------------------------------------------------------------------------------------
INTERMEDIATE-TERM
BOND FUNDS
- -------------------------------------------------------------------------------------------------------------------------
Moderate Duration    Short and intermediate maturity fixed income securities    2-5 yrs      B to Aaa; max     0-20%
                                                                                             10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Real Return Bond     Inflation-indexed fixed income securities                  N/A, but see B to Aaa; max     0-35%
                                                                                Fund         10% below Baa
                                                                                description
- -------------------------------------------------------------------------------------------------------------------------
Total Return         Intermediate maturity fixed income securities              3-6 yrs      B to Aaa; max     0-20%
                                                                                             10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Total Return II      Same as Total Return Fund, except quality and foreign      3-6 yrs      Baa to Aaa        0%
                     issuer restrictions
- -------------------------------------------------------------------------------------------------------------------------
Total Return III     Same as Total Return Fund, except prohibitions on firms    3-6 yrs      B to Aaa; max     0-20%
                     engaged in socially sensitive practices                                 10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Total Return         Intermediate maturity mortgage-related securities          2-6 yrs      Baa to Aaa; max   0%
Mortgage                                                                                     10% below Aaa
- -------------------------------------------------------------------------------------------------------------------------
Commercial Mortgage  Commercial mortgage-backed securities                      3-8 yrs      B to Aaa; max     0%
Securities                                                                                   35% below Baa
- -------------------------------------------------------------------------------------------------------------------------
High Yield           Higher yielding fixed income securities                    2-6 yrs      B to Aaa; min     0%
                                                                                             65% below Baa
- -------------------------------------------------------------------------------------------------------------------------
LONG-TERM BOND
FUNDS
- -------------------------------------------------------------------------------------------------------------------------
Long-Term U.S.       Long-term maturity fixed income securities                 greater      A to Aaa          0% 
Government                                                                      than or  
                                                                                equal to 
                                                                                8 yrs       
- -------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL BOND
FUNDS
- -------------------------------------------------------------------------------------------------------------------------
Global Bond          Intermediate maturity U.S. and foreign fixed               3-6 yrs      B to Aaa; max     25-75%
                     income securities                                                       10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Global Bond II       Intermediate maturity U.S. and hedged foreign fixed        3-6 yrs      B to Aaa; max     25-75%
                     income securities                                                       10% below Baa
- -------------------------------------------------------------------------------------------------------------------------
Foreign Bond         Intermediate maturity hedged foreign fixed income          3-6 yrs      B to Aaa; max     greater   
                     securities                                                              10% below Baa     than or   
                                                                                                               equal to  
                                                                                                               85%
- -------------------------------------------------------------------------------------------------------------------------
International Bond   Foreign fixed income securities (Fund offered only to      0-8 yrs      Baa to Aaa        greater    
                     PIMCO private account clients)                                                            than or    
                                                                                                               equal to   
                                                                                                               65% 
- -------------------------------------------------------------------------------------------------------------------------
Emerging Markets     Emerging market fixed income securities                    0-8 yrs      B to Aaa          greater   
Bond                                                                                                           than or   
                                                                                                               equal to   
                                                                                                               80% 
- -------------------------------------------------------------------------------------------------------------------------
Emerging Markets     Emerging market fixed income securities (Fund offered      0-8 yrs      B to Aaa; max     greater   
Bond II              only to PIMCO private account clients)                                  10% below BB      than or   
                                                                                                               equal to  
                                                                                                               80% 
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>    
 
3  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                         PROSPECTUS SUMMARY (CONTINUED)
 
 
<TABLE>
TAX EXEMPT FUNDS     PRIMARY INVESTMENTS                                         DURATION     CREDIT QUALITY(1) FOREIGN(2)
- --------------------------------------------------------------------------------------------------------------------------
<S>                  <C>                                                         <C>          <C>               <C>
Municipal Bond       Investment grade municipal securities (tax-exempt bonds)    3-10 yrs     Ba to Aaa; max    0%
                                                                                              10% below Baa
- --------------------------------------------------------------------------------------------------------------------------
<CAPTION>
STOCK AND BOND
FUNDS
- --------------------------------------------------------------------------------------------------------------------------
<S>                  <C>                                                         <C>          <C>               <C>
Strategic Balanced   Same as Total Return and StocksPLUS Funds according to      0-6 yrs      B to Aaa; max     0-20%
                     PIMCO's allocation strategy                                              10% below Baa
- --------------------------------------------------------------------------------------------------------------------------
<CAPTION>
STOCK FUNDS
- --------------------------------------------------------------------------------------------------------------------------
<S>                  <C>                                                         <C>          <C>               <C>
StocksPLUS           S&P 500 stock index derivatives backed by a portfolio       0-1 yr       B to Aaa; max     0-20%
                     of short-term fixed income securities                                    10% below Baa
- --------------------------------------------------------------------------------------------------------------------------
StocksPLUS Short     Inversely correlated S&P 500 derivatives backed by a        0-1 yr       B to Aaa; max     0-20%
Strategy             portfolio of short-term fixed income securities                          10% below Baa
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>
   
(1) As rated by Moody's Investors Service, Inc., or if unrated, determined to
    be of comparable quality.     
   
(2) Percentage limitations relate to foreign currency-denominated securities for
    all Funds except the PIMCO Global Bond, Global Bond II, Foreign Bond,
    International Bond, Emerging Markets Bond and Emerging Markets Bond II
    Funds. Percentage limitations for these six Funds relate to securities of
    foreign issuers, denominated in any currency. Each Fund (except the PIMCO
    Low Duration II, Total Return II, Long-Term U.S. Government and Municipal
    Bond Funds) may invest beyond these limits in U.S. dollar-denominated
    securities of foreign issuers. Neither the PIMCO Low Duration II, Total
    Return II, Long-Term U.S. Government nor Municipal Bond Funds may invest in
    any securities of foreign issuers.     
 
                    INVESTMENT OBJECTIVES OF THE PIMCO FUNDS
   
  The investment objective of each of the PIMCO Money Market and Short-Term
Funds is to seek to obtain maximum current income consistent with preservation
of capital and daily liquidity. The investment objective of the PIMCO Real
Return Bond Fund is to seek to realize maximum real return, consistent with the
preservation of real capital and prudent investment management. The investment
objective of the PIMCO Global Bond Fund II is to seek maximum total return,
consistent with the preservation of capital. The investment objective of the
PIMCO Municipal Bond Fund is to seek high current income exempt from federal
income tax, consistent with preservation of capital. Capital appreciation is a
secondary objective of the PIMCO Municipal Bond Fund. The investment objective
of each of the remaining Fixed Income Funds and the PIMCO Strategic Balanced
Fund is to seek to realize maximum total return, consistent with preservation
of capital and prudent investment management. The investment objective of the
PIMCO StocksPLUS Fund is to seek to achieve a total return which exceeds the
total return performance of the Standard & Poor's 500 Composite Stock Price
Index ("S&P 500"). The investment objective of the PIMCO StocksPLUS Short
Strategy Fund is to seek total return through the implementation of short
investment positions on the S&P 500.     
 
                      INVESTMENT RISKS AND CONSIDERATIONS
 
  The following are some of the primary risks relevant to an investment in the
Funds and to the securities in which the Funds invest. Investors should read
this Prospectus carefully for a more complete discussion of the risks relating
to an investment in the Funds.
   
  The value of all securities and other instruments held by the Funds will vary
from time to time in response to a wide variety of market factors.
Consequently, the net asset value per share of each Fund will vary, except that
the PIMCO Money Market Fund shall attempt to maintain a net asset value of
$1.00 per share, although there can be no assurance that the Fund will be
successful in doing so. The net asset value per share of any Fund may be less
at the time of redemption than it was at the time of investment.     
 
                                                    August 1, 1998 Prospectus  4
<PAGE>
 
 
                         PROSPECTUS SUMMARY (CONTINUED)
   
  Generally, the value of fixed income securities can be expected to vary
inversely with changes in prevailing interest rates, i.e., as interest rates
rise, market value tends to decrease, and vice versa, although this may not be
true in the case of inflation-indexed bonds. In addition, certain of the Funds
may invest in securities rated lower than Baa by Moody's Investors Service,
Inc. ("Moody's") or BBB by Standard & Poor's Ratings Services ("S&P"). Such
securities carry a high degree of credit risk and are considered speculative by
the major rating agencies.     
 
  Certain Funds may invest in securities of foreign issuers, which may be
subject to additional risk factors, including foreign currency and political
risks, not applicable to securities of U.S. issuers. Certain of the Funds'
investment techniques may involve a form of borrowing, which may tend to
exaggerate the effect on net asset value of any increase or decrease in the
market value of a Fund's portfolio and may require liquidation of portfolio
positions when it is not advantageous to do so. Certain Funds may sell
securities short, which exposes the Fund to a risk of loss if the value of the
security sold short should increase.
 
  All Funds (except the PIMCO Money Market Fund) may use derivative
instruments, consisting of futures, options, options on futures, and swap
agreements, for hedging purposes or as part of their investment strategies. Use
of these instruments may involve certain costs and risks, including the risk
that a Fund could not close out a position when it would be most advantageous
to do so, the risk of an imperfect correlation between the value of the
securities being hedged and the value of the particular derivative instrument,
and the risk that unexpected changes in interest rates may adversely affect the
value of a Fund's investments in particular derivative instruments.
 
  Investors should carefully consider the possible tax consequences from
investing in the PIMCO Real Return Bond Fund. The Fund invests primarily in
securities that for tax purposes may be considered to have been issued
originally at a discount. Accordingly, the Fund may be required to make annual
distributions to shareholders in excess of the cash received by the Fund in a
given period from those investments. See "Characteristics and Risks of
Securities and Investment Techniques -- Inflation-Indexed Bonds" and
"Dividends, Distributions and Taxes" for additional information.
 
  Some of the Funds offer their shares to both retail and institutional
investors. Institutional shareholders, some of whom also may be investment
advisory clients of PIMCO, may hold large positions in certain of the Funds.
Such shareholders may on occasion make large redemptions of their holdings in
the Funds to meet their liquidity needs, in connection with strategic
adjustments to their overall portfolio of investments, or for other purposes.
Large redemptions from some Funds could require the Adviser to liquidate
portfolio positions when it is not most desirable to do so. Liquidation of
portfolio holdings also may cause a Fund to realize taxable capital gains.
 
  The PIMCO Real Return Bond, Commercial Mortgage Securities, Global Bond,
Global Bond II, Foreign Bond, International Bond, Emerging Markets Bond and
Emerging Markets Bond II Funds are "non-diversified" for purposes of the
Investment Company Act of 1940 (the "1940 Act"), meaning that they may invest a
greater percentage of their assets in the securities of one issuer than the
other Funds. As "non-diversified" portfolios, these Funds may be more
susceptible to risks associated with a single economic, political or regulatory
occurrence than a diversified portfolio might be. See "Investment Objectives
and Policies" and "Characteristics and Risks of Securities and Investment
Techniques" for additional information.
 
                   INVESTMENT ADVISER AND FUND ADMINISTRATOR
 
  Pacific Investment Management Company ("PIMCO") serves as investment adviser
("Adviser") to the Trust, and also serves as the Trust's administrator. The
Adviser is an investment management firm established in 1971 that had
approximately
 
5  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
                         PROSPECTUS SUMMARY (CONTINUED)
   
$138 billion of assets under management as of June 30, 1998. The Adviser is a
subsidiary of PIMCO Advisors L.P. ("PIMCO Advisors"), which had approximately
$229 billion of assets under management as of June 30, 1998. See "Management of
the Trust."     
 
                               PURCHASE OF SHARES
 
  This Prospectus describes two classes of shares of each Fund: the
"Institutional Class" and the "Administrative Class." Shares of the
Institutional Class are offered primarily for direct investment by
institutional investors (Institutional Class shares may also be offered through
certain financial intermediaries that charge their customers transaction or
other fees with respect to the customers' investments in the Funds). Shares of
the Administrative Class are offered primarily through employee benefit plan
alliances, broker-dealers, and other intermediaries, and each Fund pays service
and distribution fees to such entities for services they provide to such Fund's
shareholders of that class. Administrative Class shares of certain Funds are
not currently available for investment.
   
  Shares of the Institutional Class and Administrative Class of the Funds are
offered at the relevant next determined net asset value with no sales charge.
The minimum initial investment for shares of either class is $5 million,
subject to certain exceptions. Shares of either class may also be offered to
clients of the Adviser and its affiliates. Shares of the PIMCO International
Bond and Emerging Markets Bond II Funds are offered only to private account
clients of PIMCO. See "Purchase of Shares."     
 
                           REDEMPTIONS AND EXCHANGES
 
  Institutional Class and Administrative Class shares of each Fund may be
redeemed without cost at the relevant net asset value per share of the class of
that Fund next determined after receipt of the redemption request. The PIMCO
StocksPLUS Short Strategy Fund imposes a redemption fee, payable to the Fund,
of 1% on all shares of the Fund held for less than three months. The redemption
price may be more or less than the purchase price.
   
  Institutional Class and Administrative Class shares of any Fund may be
exchanged on the basis of relative net asset values, for shares of the same
class of any other Fund of the Trust offered generally to the public, except
that only private account clients of PIMCO may purchase shares of the PIMCO
International Bond and Emerging Markets Bond II Funds. Shares of a Fund may
also be exchanged for shares of the same class of a series of PIMCO Funds:
Multi-Manager Series, an affiliated mutual fund family, composed primarily of
equity portfolios managed by the subsidiary partnerships of PIMCO Advisors. See
"Redemption of Shares."     
 
                          DIVIDENDS AND DISTRIBUTIONS
 
  Each Fund will distribute dividends from net investment income at least
monthly (quarterly in the case of the PIMCO International Bond Fund, PIMCO
Strategic Balanced Fund and Stock Funds), and any net realized capital gains at
least annually. All dividends and distributions will be reinvested
automatically at net asset value in additional shares of the same class of the
same Fund, unless cash payment is requested. Dividends from net investment
income with respect to Administrative Class shares will be lower than those
paid with respect to Institutional Class shares, reflecting the payment of
service or distribution fees by that class. See "Dividends, Distributions and
Taxes."
 
                                                    August 1, 1998 Prospectus  6
<PAGE>
 
                              EXPENSE INFORMATION
 
SHAREHOLDER TRANSACTION EXPENSES (INSTITUTIONAL CLASS AND ADMINISTRATIVE
CLASS):
<TABLE>
<S>                                                                         <C>
  Sales Load Imposed on Purchases.......................................... None
  Sales Load Imposed on Reinvested Dividends............................... None
  Redemption Fee:
    StocksPLUS Short Strategy Fund.........................................  1%*
    All Other Funds........................................................ None
  Exchange Fee............................................................. None
</TABLE>
*On shares held less than 3 months.
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS):
<TABLE>
<CAPTION>
                                            ADVISORY    ADMINISTRATIVE   TOTAL
   INSTITUTIONAL CLASS SHARES                 FEE             FEE       EXPENSES
   --------------------------            -------------- --------------- --------
   <S>                                   <C>            <C>             <C>
   Money Market Fund...................       0.15%          0.20%        0.35%
   Short-Term Fund.....................       0.25           0.20         0.45
   Low Duration Fund...................       0.25           0.18         0.43
   Low Duration Fund II................       0.25           0.25         0.50
   Low Duration Fund III...............       0.25           0.25         0.50
   Low Duration Mortgage Fund..........       0.25           0.25         0.50
   Moderate Duration Fund..............       0.25           0.20         0.45
   Real Return Bond Fund...............       0.25           0.25         0.50
   Total Return Fund...................       0.25           0.18         0.43
   Total Return Fund II................       0.25           0.25         0.50
   Total Return Fund III...............       0.25           0.25         0.50
   Total Return Mortgage Fund..........       0.25           0.25         0.50
   Commercial Mortgage Securities Fund.       0.40           0.25         0.65
   High Yield Fund.....................       0.25           0.25         0.50
   Long-Term U.S. Government Fund......       0.25           0.25         0.50
   Global Bond Fund....................       0.25           0.30         0.55
   Global Bond Fund II.................       0.25           0.30         0.55
   Foreign Bond Fund...................       0.25           0.25         0.50
   International Bond Fund.............       0.25           0.25         0.50
   Emerging Markets Bond Fund..........       0.45           0.40         0.85
   Emerging Markets Bond Fund II.......       0.45           0.40         0.85
   Municipal Bond Fund.................       0.25           0.25         0.50
   Strategic Balanced Fund.............       0.40           0.25         0.65
   StocksPLUS Fund.....................       0.40           0.25         0.65
   StocksPLUS Short Strategy Fund......       0.40           0.25         0.65
<CAPTION>
                                ADVISORY ADMINISTRATIVE 12B-1 (SERVICE)  TOTAL
   ADMINISTRATIVE CLASS SHARES    FEE         FEE             FEE       EXPENSES
   ---------------------------  -------- -------------- --------------- --------
   <S>                          <C>      <C>            <C>             <C>
   Money Market Fund..........    0.15%       0.20%          0.25%        0.60%
   Short-Term Fund............    0.25        0.20           0.25         0.70
   Low Duration Fund..........    0.25        0.18           0.25         0.68
   Low Duration Fund II.......    0.25        0.25           0.25         0.75
   Low Duration Fund III......    0.25        0.25           0.25         0.75
   Low Duration Mortgage Fund.    0.25        0.25           0.25         0.75
   Moderate Duration Fund.....    0.25        0.20           0.25         0.70
   Real Return Bond Fund......    0.25        0.25           0.25         0.75
   Total Return Fund..........    0.25        0.18           0.25         0.68
   Total Return Fund II.......    0.25        0.25           0.25         0.75
   Total Return Fund III......    0.25        0.25           0.25         0.75
   Total Return Mortgage Fund.    0.25        0.25           0.25         0.75
   Commercial Mortgage
    Securities Fund...........    0.40        0.25           0.25         0.90
   High Yield Fund............    0.25        0.25           0.25         0.75
   Long-Term U.S. Government
    Fund......................    0.25        0.25           0.25         0.75
   Global Bond Fund...........    0.25        0.30           0.25         0.80
   Global Bond Fund II........    0.25        0.30           0.25         0.80
   Foreign Bond Fund..........    0.25        0.25           0.25         0.75
   International Bond Fund....    0.25        0.25           0.25         0.75
   Emerging Markets Bond Fund.    0.45        0.40           0.25         1.10
   Emerging Markets Bond Fund
    II........................    0.45        0.40           0.25         1.10
   Municipal Bond Fund........    0.25        0.25           0.25         0.75
   Strategic Balanced Fund....    0.40        0.25           0.25         0.90
   StocksPLUS Fund............    0.40        0.25           0.25         0.90
   StocksPLUS Short Strategy
    Fund......................    0.40        0.25           0.25         0.90
</TABLE>
 
7  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                         
                      EXPENSE INFORMATION (CONTINUED)     
  For a more detailed discussion of the Funds' fees and expenses, see "Fund
Administrator," "Advisory and Administrative Fees," and "Service and
Distribution Fees" under the caption "Management of the Trust."
 
EXAMPLE OF FUND EXPENSES:
 
  An investor would pay the following expenses on a $1,000 investment, assuming
(1) a hypothetical 5% annual return and (2) redemption at the end of each time
period:
 
<TABLE>   
<CAPTION>
   INSTITUTIONAL CLASS SHARES                    1 YEAR 3 YEARS 5 YEARS 10 YEARS
   --------------------------                    ------ ------- ------- --------
   <S>                                           <C>    <C>     <C>     <C>
   Money Market Fund............................   $4     $11     $20     $44
   Short-Term Fund..............................    5      14      25      57
   Low Duration Fund............................    4      14      24      54
   Low Duration Fund II.........................    5      16      28      63
   Low Duration Fund III........................    5      16      28      63
   Low Duration Mortgage Fund...................    5      16      28      63
   Moderate Duration Fund.......................    5      14      25      57
   Real Return Bond Fund........................    5      16      28      63
   Total Return Fund............................    4      14      24      54
   Total Return Fund II.........................    5      16      28      63
   Total Return Fund III........................    5      16      28      63
   Total Return Mortgage Fund...................    5      16      28      63
   Commercial Mortgage Securities Fund..........    7      21      36      81
   High Yield Fund..............................    5      16      28      63
   Long-Term U.S. Government Fund...............    5      16      28      63
   Global Bond Fund.............................    6      18      31      69
   Global Bond Fund II..........................    6      18      31      69
   Foreign Bond Fund............................    5      16      28      63
   International Bond Fund......................    5      16      28      63
   Emerging Markets Bond Fund...................    9      27      47     105
   Emerging Markets Bond Fund II................    9      27      47     105
   Municipal Bond Fund..........................    5      16      28      63
   Strategic Balanced Fund......................    7      21      36      81
   StocksPLUS Fund..............................    7      21      36      81
   StocksPLUS Short Strategy Fund...............    7      21      36      81
<CAPTION>
   ADMINISTRATIVE CLASS SHARES                   1 YEAR 3 YEARS 5 YEARS 10 YEARS
   ---------------------------                   ------ ------- ------- --------
   <S>                                           <C>    <C>     <C>     <C>
   Money Market Fund............................   $6     $19     $33     $75
   Short-Term Fund..............................    7      22      39      87
   Low Duration Fund............................    7      22      38      85
   Low Duration Fund II.........................    8      24      42      93
   Low Duration Fund III........................    8      24      42      93
   Low Duration Mortgage Fund...................    8      24      42      93
   Moderate Duration Fund.......................    7      22      39      87
   Real Return Bond Fund........................    8      24      42      93
   Total Return Fund............................    7      22      38      85
   Total Return Fund II.........................    8      24      42      93
   Total Return Fund III........................    8      24      42      93
   Total Return Mortgage Fund...................    8      24      42      93
   Commercial Mortgage Securities Fund..........    9      29      50     111
   High Yield Fund..............................    8      24      42      93
   Long-Term U.S. Government Fund...............    8      24      42      93
   Global Bond Fund.............................    8      26      44      99
   Global Bond Fund II..........................    8      26      44      99
   Foreign Bond Fund ...........................    8      24      42      93
   International Bond Fund......................    8      24      42      93
   Emerging Markets Bond Fund...................   11      35      61     134
   Emerging Markets Bond Fund II................   11      35      61     134
   Municipal Bond Fund..........................    8      24      42      93
   Strategic Balanced Fund......................    9      29      50     111
   StocksPLUS Fund..............................    9      29      50     111
   StocksPLUS Short Strategy Fund...............    9      29      50     111
</TABLE>    
 
  The above tables are provided to assist investors in understanding the
various expenses which may be borne directly or indirectly in connection with
an investment in the Funds. The information is based upon each Funds' current
fees and expenses. This example should not be considered a representation of
past or future expenses or performance. Actual expenses may be higher or lower
than those shown.
 
                                                    August 1, 1998 Prospectus  8
<PAGE>
 
                              FINANCIAL HIGHLIGHTS
   
  The following information regarding selected per share data and ratios for
shares of certain of the Funds is part of the Trust's audited financial
statements, which are included in the Trust's Annual Report dated March 31,
1998, which is incorporated by reference in the Statement of Additional
Information. The Trust's audited financial statements and selected per share
data and ratios appearing below have been examined by PricewaterhouseCoopers
LLP (formerly Price Waterhouse LLP), independent accountants, whose opinion
thereon is also included in the Annual Report, which may be obtained without
charge. Information is presented for each Fund of the Trust which had
investment operations during the reporting periods. Information regarding the
PIMCO Money Market and Total Return II Funds reflects the operational history
of the Money Market Fund and PIMCO Managed Bond and Income Fund, respectively,
two former series of PIMCO Funds: Multi-Manager Series which were reorganized
as series of the Trust as of November 1, 1995. On that date, the investment
advisory responsibilities of Pacific Life Insurance Company (formerly Pacific
Mutual Life Insurance Company) with respect to the Money Market Fund were
assumed by PIMCO.     
 
  Selected data for a share outstanding throughout each period:
 
<TABLE>   
<CAPTION>
                   NET ASSET              NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS DISTRIBUTIONS
  YEAR OR            VALUE      NET      AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    IN EXCESS OF
   PERIOD          BEGINNING INVESTMENT  GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    NET REALIZED
   ENDED           OF PERIOD   INCOME     INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS CAPITAL GAINS
- -------------------------------------------------------------------------------------------------------------------------
<S>                <C>       <C>         <C>            <C>          <C>        <C>           <C>           <C>
MONEY MARKET FUND
 Institutional Class
        3/31/98     $ 1.00     $0.05(+)      $ 0.00 (+)    $0.05       $(0.05)     $ 0.00        $ 0.00         $0.00
        3/31/97       1.00      0.05           0.00         0.05        (0.05)       0.00          0.00          0.00
11/1/95-3/31/96       1.00      0.02           0.00         0.02        (0.02)       0.00          0.00          0.00
       10/31/95       1.00      0.06           0.00         0.06        (0.06)       0.00          0.00          0.00
       10/31/94       1.00      0.03           0.00         0.03        (0.03)       0.00          0.00          0.00
       10/31/93       1.00      0.03           0.00         0.03        (0.03)       0.00          0.00          0.00
       10/31/92       1.00      0.04           0.00         0.04        (0.04)       0.00          0.00          0.00
       10/31/91(a)    1.00      0.04           0.00         0.04        (0.04)       0.00          0.00          0.00
 Administrative Class
        3/31/98       1.00      0.05(+)        0.00 (+)     0.05        (0.05)       0.00          0.00          0.00
        3/31/97       1.00      0.05           0.00         0.05        (0.05)       0.00          0.00          0.00
        3/31/96       1.00      0.02           0.00         0.02        (0.02)       0.00          0.00          0.00
       10/31/95(b)    1.00      0.05           0.00         0.05        (0.05)       0.00          0.00          0.00
SHORT-TERM FUND
 Institutional Class
        3/31/98     $10.00     $0.62(+)      $ 0.06 (+)    $0.68       $(0.60)     $(0.01)       $(0.01)        $0.00
        3/31/97       9.92      0.61           0.08         0.69        (0.59)      (0.02)         0.00          0.00
        3/31/96       9.79      0.69           0.12         0.81        (0.65)      (0.03)         0.00          0.00
        3/31/95       9.92      0.56          (0.13)        0.43        (0.55)      (0.01)         0.00          0.00
        3/31/94      10.03      0.48          (0.12)        0.36        (0.47)       0.00          0.00          0.00
        3/31/93      10.01      0.37           0.02         0.39        (0.37)       0.00          0.00          0.00
        3/31/92      10.02      0.55           0.00         0.55        (0.55)       0.00         (0.01)         0.00
        3/31/91       9.99      0.77           0.04         0.81        (0.78)       0.00          0.00          0.00
        3/31/90      10.00      0.86          (0.01)        0.85        (0.86)       0.00          0.00          0.00
        3/31/89      10.00      0.81          (0.01)        0.80        (0.80)       0.00          0.00          0.00
 Administrative Class
        3/31/98      10.00      0.59(+)        0.07 (+)     0.66        (0.58)      (0.01)        (0.01)         0.00
        3/31/97       9.92      0.58           0.08         0.66        (0.57)      (0.01)         0.00          0.00
        3/31/96(c)    9.98      0.11          (0.07)        0.04        (0.10)       0.00          0.00          0.00
LOW DURATION FUND
 Institutional Class
        3/31/98     $ 9.98     $0.65(+)      $ 0.23 (+)    $0.88       $(0.63)     $(0.02)       $(0.03)        $0.00
        3/31/97       9.95      0.64           0.03         0.67        (0.63)      (0.01)         0.00          0.00
        3/31/96       9.76      0.66           0.21         0.87        (0.68)       0.00          0.00          0.00
        3/31/95      10.04      0.65          (0.30)        0.35        (0.54)       0.00          0.00          0.00
        3/31/94      10.30      0.62          (0.16)        0.46        (0.64)      (0.03)        (0.05)         0.00
        3/31/93      10.20      0.75           0.22         0.97        (0.74)       0.00         (0.13)         0.00
        3/31/92      10.02      0.83           0.25         1.08        (0.82)       0.00         (0.08)         0.00
        3/31/91       9.89      0.89           0.12         1.01        (0.88)       0.00          0.00          0.00
        3/31/90       9.70      0.88           0.20         1.08        (0.88)       0.00         (0.01)         0.00
        3/31/89       9.99      0.89          (0.25)        0.64        (0.90)       0.00         (0.03)         0.00
 Administrative Class
        3/31/98       9.98      0.63(+)        0.22 (+)     0.85        (0.60)      (0.02)        (0.03)         0.00
        3/31/97       9.95      0.62           0.03         0.65        (0.60)      (0.02)         0.00          0.00
        3/31/96       9.76      0.63           0.21         0.84        (0.65)       0.00          0.00          0.00
        3/31/95(d)    9.67      0.18           0.07         0.25        (0.14)       0.00          0.00          0.00
LOW DURATION FUND II
 Institutional Class
        3/31/98     $ 9.81     $0.22(+)      $ 0.59 (+)    $0.81       $(0.56)     $(0.04)       $(0.02)        $0.00
        3/31/97       9.82      0.62          (0.03)        0.59        (0.58)      (0.02)         0.00          0.00
        3/31/96       9.77      0.66           0.04         0.70        (0.60)      (0.03)         0.00          0.00
        3/31/95       9.94      0.62          (0.16)        0.46        (0.58)      (0.03)         0.00          0.00
        3/31/94      10.25      0.60          (0.28)        0.32        (0.58)       0.00         (0.05)         0.00
        3/31/93      10.04      0.63           0.25         0.88        (0.64)       0.00         (0.03)         0.00
        3/31/92(e)   10.00      0.28           0.03         0.31        (0.27)       0.00          0.00          0.00
 Administrative Class
        3/31/98(f)   10.03      0.14(+)       (0.08)(+)     0.06        (0.08)      (0.01)         0.00          0.00
</TABLE>    
- --------
<TABLE>     
<S>                                                             <C> 
(a) From commencement of operations, March 1, 1991.             (d) From commencement of operations, January 3, 1995.      
(b) From commencement of operations, January 25, 1995.          (e) From commencement of operations, November 1, 1991.      
(c) From commencement of operations, February 1, 1996.          (f) From commencement of operations, February 2, 1998.      
+ Per share amounts based on average number of shares outstanding during the period.
</TABLE>      

 
9  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
 
 
 
<TABLE>   
<CAPTION>
                                                                   RATIO OF NET
                          NET ASSET         NET ASSETS  RATIO OF    INVESTMENT
TAX BASIS                   VALUE              END     EXPENSES TO  INCOME TO   PORTFOLIO
  RETURN        TOTAL        END    TOTAL   OF PERIOD    AVERAGE     AVERAGE    TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN   (000'S)   NET ASSETS   NET ASSETS    RATE
- -----------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>     <C>        <C>         <C>          <C>
  $ 0.00       $(0.05)     $ 1.00    5.40%  $   55,335    0.35%        5.29%       N/A
    0.00        (0.05)       1.00    5.19       23,497    0.40         5.08        N/A
    0.00        (0.02)       1.00    2.58       25,935    0.33+        5.44+       N/A
    0.00        (0.06)       1.00    5.67        7,741    0.40         5.53        N/A
    0.00        (0.03)       1.00    3.53        7,454    0.40         3.52        N/A
    0.00        (0.03)       1.00    2.83        5,836    0.40         2.78        N/A
    0.00        (0.04)       1.00    3.85        7,817    0.40         4.02        N/A
    0.00        (0.04)       1.00    3.78       45,406    0.53+        5.20        N/A
    0.00        (0.05)       1.00    5.12          749    0.60         5.04        N/A
    0.00        (0.05)       1.00    4.94           12    0.66         4.83        N/A
    0.00        (0.02)       1.00    2.47           10    0.61+        5.95+       N/A
    0.00        (0.05)       1.00    4.21           10    0.68+        5.94+       N/A
  $ 0.00       $(0.62)     $10.06    7.06%  $  172,846    0.45%        6.12%        48%
    0.00        (0.61)      10.00    7.12      156,515    0.47         6.12         77
    0.00        (0.68)       9.92    8.49      101,797    0.58         6.86        215
    0.00        (0.56)       9.79    4.46       90,114    0.50         5.67         79
    0.00        (0.47)       9.92    3.66       73,176    0.50         4.87         46
    0.00        (0.37)      10.03    3.94       46,905    0.50         3.67         55
    0.00        (0.56)      10.01    5.66       44,172    0.50         5.52         95
    0.00        (0.78)      10.02    8.44       44,820    0.50         7.83        115
    0.00        (0.86)       9.99    8.86       13,649    0.50         8.61        140
    0.00        (0.80)      10.00    8.29       14,401    0.50         8.57        178
    0.00        (0.60)      10.06    6.80        5,147    0.70         5.86         48
    0.00        (0.58)      10.00    6.86        4,513    0.72         5.87         77
    0.00        (0.10)       9.92    0.41        3,999    0.52+        4.44+       215
  $ 0.00       $(0.68)     $10.18    9.00%  $2,759,531    0.43%        6.39%       309%
    0.00        (0.64)       9.98    6.97    2,797,001    0.43         6.46        240
    0.00        (0.68)       9.95    9.13    2,677,574    0.42         6.88        209
   (0.09)       (0.63)       9.76    3.60    2,332,032    0.41         6.46         77
    0.00        (0.72)      10.04    4.56    2,298,255    0.43         6.05         43
    0.00        (0.87)      10.30    9.91    1,403,594    0.45         7.21         68
    0.00        (0.90)      10.20   11.30      906,650    0.50         8.08         37
    0.00        (0.88)      10.02   10.60      516,325    0.57         8.97         44
    0.00        (0.89)       9.89   11.36      317,425    0.60         8.83        162
    0.00        (0.93)       9.70    6.49      172,046    0.60         8.83         56
    0.00        (0.65)      10.18    8.73       46,186    0.68         6.16        309
    0.00        (0.62)       9.98    6.71       23,564    0.68         6.21        240
    0.00        (0.65)       9.95    8.83        2,536    0.69         6.73        209
   (0.02)       (0.16)       9.76    2.53          771    0.66+        6.93+        77
  $ 0.00       $(0.62)     $10.00    8.29%  $  401,204    0.50%        5.98%       335%
    0.00        (0.60)       9.81    6.33      339,375    0.51         6.31        237
   (0.02)       (0.65)       9.82    7.30      253,299    0.48         6.61        225
   (0.02)       (0.63)       9.77    4.80      170,866    0.47         6.35        102
    0.00        (0.63)       9.94    3.15      141,411    0.50         5.73         54
    0.00        (0.67)      10.25    8.95      101,025    0.50         6.16         95
    0.00        (0.27)      10.04    7.72+      31,027    0.51+        6.80+        13
    0.00        (0.09)      10.00    0.58           56    0.75+        8.53+       335
</TABLE>    
- --------
+ Annualized.
 
                                                   August 1, 1998 Prospectus  10
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
 
<TABLE>   
<CAPTION>
                   NET ASSET              NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS DISTRIBUTIONS
  YEAR OR            VALUE      NET      AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    IN EXCESS OF
   PERIOD          BEGINNING INVESTMENT  GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    NET REALIZED
   ENDED           OF PERIOD   INCOME     INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS CAPITAL GAINS
- -------------------------------------------------------------------------------------------------------------------------
<S>                <C>       <C>         <C>            <C>          <C>        <C>           <C>           <C>
LOW DURATION FUND III
 Institutional Class
        3/31/98     $ 9.91     $0.53(+)      $ 0.24 (+)    $ 0.77      $(0.60)     $ 0.00        $(0.03)       $ 0.00
        3/31/97(g)   10.00      0.15          (0.09)         0.06       (0.15)       0.00          0.00          0.00
LOW DURATION MORTGAGE FUND
 Institutional Class
        3/31/98(h)  $10.00     $0.43(+)      $ 0.14 (+)    $ 0.57      $(0.42)     $ 0.00        $(0.02)       $ 0.00
MODERATE DURATION FUND
 Institutional Class
        3/31/98     $ 9.83     $0.38(+)      $ 0.56(+)     $ 0.94      $(0.60)     $ 0.00        $(0.03)       $ 0.00
        3/31/97(g)   10.00      0.15          (0.17)        (0.02)      (0.15)       0.00          0.00          0.00
REAL RETURN BOND FUND
 Institutional Class
        3/31/98     $ 9.93     $0.44(+)      $ 0.05 (+)    $ 0.49      $(0.48)     $(0.03)       $(0.14)       $ 0.00
        3/31/97(i)    9.92      0.11          (0.02)         0.09       (0.08)       0.00          0.00          0.00
TOTAL RETURN FUND
 Institutional Class
        3/31/98     $10.27     $0.64(+)      $ 0.62 (+)    $ 1.26      $(0.62)     $(0.02)       $(0.27)       $ 0.00
        3/31/97      10.29      0.68          (0.02)         0.66       (0.66)      (0.02)         0.00          0.00
        3/31/96      10.02      0.81           0.29          1.10       (0.61)      (0.10)        (0.12)         0.00
        3/31/95      10.25      0.64          (0.24)         0.40       (0.56)      (0.05)         0.00          0.00
        3/31/94      10.91      0.68          (0.16)         0.52       (0.71)      (0.15)        (0.30)        (0.02)
        3/31/93      10.46      0.76           0.76          1.52       (0.76)       0.00         (0.31)         0.00
        3/31/92      10.15      0.86           0.60          1.46       (0.86)       0.00         (0.29)         0.00
        3/31/91       9.77      0.90           0.39          1.29       (0.90)       0.00         (0.01)         0.00
        3/31/90       9.62      0.87           0.21          1.08       (0.87)       0.00         (0.06)         0.00
        3/31/89      10.04      0.90          (0.23)         0.67       (0.91)       0.00         (0.18)         0.00
 Administrative Class
        3/31/98      10.27      0.61(+)        0.63 (+)      1.24       (0.60)      (0.02)        (0.27)         0.00
        3/31/97      10.29      0.66(+)       (0.02)(+)      0.64       (0.64)      (0.02)         0.00          0.00
        3/31/96      10.01      0.80           0.29          1.09       (0.60)      (0.09)        (0.12)         0.00
        3/31/95(j)   10.00      0.31           0.06          0.37       (0.32)      (0.03)         0.00          0.00
TOTAL RETURN FUND II
 Institutional Class
        3/31/98     $ 9.85     $0.63(+)      $ 0.52 (+)    $ 1.15      $(0.60)     $(0.03)       $(0.11)       $ 0.00
        3/31/97(b)    9.89      0.61          (0.02)         0.59       (0.62)      (0.01)         0.00          0.00
11/1/95-3/31/96      10.21      0.25          (0.17)         0.08       (0.26)       0.00         (0.09)        (0.05)
       10/31/95       9.39      0.69           0.76          1.45       (0.62)       0.00         (0.01)         0.00
       10/31/94      10.38      0.51          (0.88)        (0.37)      (0.51)       0.00         (0.05)         0.00
       10/31/93       9.99      0.61           0.74          1.35       (0.61)       0.00         (0.35)         0.00
       10/31/92(k)   10.00      0.49           0.23          0.72       (0.49)       0.00         (0.24)         0.00
 Administrative Class
        3/31/98       9.85      0.60(+)        0.52 (+)      1.12       (0.57)      (0.03)        (0.11)         0.00
        3/31/97       9.89      0.59          (0.02)         0.57       (0.60)      (0.01)         0.00          0.00
        3/31/96      10.22      0.24          (0.17)         0.07       (0.26)       0.00         (0.09)        (0.05)
       10/31/95(l)    9.34      0.56           0.88          1.44       (0.55)       0.00         (0.01)         0.00
TOTAL RETURN FUND III
 Institutional Class
        3/31/98     $ 9.15     $0.57(+)      $ 0.56 (+)    $ 1.13      $(0.54)     $(0.03)       $(0.16)       $ 0.00
        3/31/97       9.13      0.55           0.05          0.60       (0.55)      (0.02)         0.00         (0.01)
        3/31/96       8.99      0.72           0.17          0.89       (0.54)      (0.09)        (0.12)         0.00
        3/31/95       9.18      0.59          (0.16)         0.43       (0.52)      (0.02)         0.00          0.00
        3/31/94       9.81      0.59          (0.03)         0.56       (0.66)      (0.12)        (0.20)        (0.21)
        3/31/93      10.31      0.64           0.75          1.39       (0.64)       0.00         (1.25)         0.00
        3/31/92(m)   10.00      0.63           0.58          1.21       (0.63)       0.00         (0.27)         0.00
 Administrative Class
     3/31/98(n)       9.12      0.54(+)        0.58 (+)      1.12       (0.50)      (0.03)        (0.16)         0.00
TOTAL RETURN MORTGAGE FUND
 Institutional Class
     3/31/98(h)     $10.00     $0.41(+)      $ 0.30 (+)    $ 0.71      $(0.46)     $ 0.00        $(0.01)       $ 0.00
HIGH YIELD FUND
 Institutional Class
        3/31/98     $11.10     $0.98(+)      $ 0.65 (+)    $ 1.63      $(0.98)     $ 0.00        $ 0.00        $(0.09)
        3/31/97      10.94      0.92           0.34          1.26       (0.97)       0.00         (0.13)         0.00
        3/31/96      10.42      1.04           0.54          1.58       (1.01)       0.00         (0.05)         0.00
        3/31/95      10.52      0.99          (0.12)         0.87       (0.93)      (0.02)         0.00         (0.02)
        3/31/94      10.41      0.90           0.18          1.08       (0.90)       0.00         (0.07)         0.00
        3/31/93(o)   10.00      0.24           0.41          0.65       (0.24)       0.00          0.00          0.00
 Administrative Class
        3/31/98      11.10      0.95(+)        0.65 (+)      1.60       (0.95)       0.00          0.00         (0.09)
        3/31/97      10.94      0.85(+)        0.38 (+)      1.23       (0.94)       0.00         (0.13)         0.00
        3/31/96      10.41      1.02(+)        0.54 (+)      1.56       (0.98)       0.00         (0.05)         0.00
        3/31/95(p)   10.14      0.23           0.25          0.48       (0.21)       0.00          0.00          0.00
</TABLE>    
- --------
<TABLE>     
<S>                                                                   <C> 
(g) From commencement of operations, December 31, 1996.               (l) From commencement of operations, November 30, 1994.    
(h) From commencement of operations, July 31, 1997.                   (m) From commencement of operations, May 1, 1991.
(i) From commencement of operations, January 29, 1997.                (n) From commencement of operations, April 11, 1997. 
(j) From commencement of operations, September 8, 1994.               (o) From commencement of operations, December 16, 1992. 
(k) From commencement of operations, December 30, 1991.               (p) From commencement of operations, January 16, 1995. 
</TABLE>      
                                       
 
11  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
 
<TABLE>   
<CAPTION>
                          NET ASSET         NET ASSETS   RATIO OF      RATIO OF NET
TAX BASIS                   VALUE               END     EXPENSES TO     INVESTMENT     PORTFOLIO
  RETURN        TOTAL        END    TOTAL    OF PERIOD    AVERAGE    INCOME TO AVERAGE TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN    (000'S)   NET ASSETS      NET ASSETS       RATE
- ------------------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>     <C>         <C>          <C>               <C>
  $ 0.00       $(0.63)     $10.05     7.93% $    23,896    0.50%            5.98%         307%
    0.00        (0.15)       9.91     0.58       10,056    0.49+            6.00+         155
  $ 0.00       $(0.44)     $10.13     5.86% $     3,748    1.81%(q)         6.30%         486%
  $ 0.00       $(0.63)     $10.14     9.80% $   239,152    0.45%            3.75%          96%
    0.00        (0.15)       9.83    (0.25)      13,458    0.44+            6.01+          49
  $ 0.00       $(0.65)     $ 9.77     4.70% $     5,526    0.52%            4.46%         967%
    0.00        (0.08)       9.93     0.09        5,638    0.51+            6.54+         160
  $ 0.00       $(0.91)     $10.62    12.63% $16,484,119    0.43%            6.06%         206%
    0.00        (0.68)      10.27     6.60   12,528,536    0.43             6.60          173
    0.00        (0.83)      10.29    11.14   10,247,605    0.42             6.85          221
   (0.02)       (0.63)      10.02     4.22    7,239,735    0.41             6.72           98
    0.00        (1.18)      10.25     4.55    5,008,160    0.41             6.27          177
    0.00        (1.07)      10.91    15.29    3,155,441    0.43             7.07           90
    0.00        (1.15)      10.46    14.90    1,813,935    0.46             8.18          110
    0.00        (0.91)      10.15    13.74      975,619    0.49             9.10           99
    0.00        (0.93)       9.77    11.36      659,663    0.60             8.60          110
    0.00        (1.09)       9.62     5.96      192,613    0.60             8.53          195
    0.00        (0.89)      10.62    12.36      481,730    0.68             5.74          206
    0.00        (0.66)      10.27     6.34      151,194    0.68             6.35          173
    0.00        (0.81)      10.29    10.99      104,618    0.68             6.64          221
   (0.01)       (0.36)      10.01     3.76        9,037    0.66+            6.54+          98
  $ 0.00       $(0.74)     $10.26    11.99% $   574,587    0.50%            6.15%         361%
    0.00        (0.63)       9.85     6.15      478,451    0.50             6.38          293
    0.00        (0.40)       9.89     0.78      455,583    0.51+            6.36+          73
    0.00        (0.63)      10.21    15.96      442,091    0.50             6.47           41
   (0.06)       (0.62)       9.39    (3.58)     357,900    0.50             5.22           99
    0.00        (0.96)      10.38    13.79      371,260    0.50             5.38           50
    0.00        (0.73)       9.99     7.52      287,113    0.50+            5.83+         134
    0.00        (0.71)      10.26    11.71       15,172    0.75             5.86          361
    0.00        (0.61)       9.85     5.88        5,304    0.75             6.13          293
    0.00        (0.40)       9.89     0.57        3,320    0.76+            6.06+          73
    0.00        (0.56)      10.22    15.92        3,163    0.76+            6.22+          41
  $ 0.00       $(0.73)     $ 9.55    12.62% $   365,249    0.51%            5.99%         183%
    0.00        (0.58)       9.15     6.76      193,297    0.51             6.21           90
    0.00        (0.75)       9.13    10.06      142,223    0.50             6.82          177
   (0.08)       (0.62)       8.99     4.92       99,497    0.50             6.95          146
    0.00        (1.19)       9.18     5.64       97,522    0.50             6.00           95
    0.00        (1.89)       9.81    14.47       65,349    0.51             6.06          161
    0.00        (0.90)      10.31    13.61+      47,908    0.60+            6.75+         521
    0.00        (0.69)       9.55    12.46          178    0.76+            5.85+         183
  $ 0.00       $(0.47)     $10.24     6.69% $     3,588    0.52%+           6.07%+        593%
  $ 0.00       $(1.07)     $11.66    15.26% $ 1,628,930    0.50%            8.52%          37%
    0.00        (1.10)      11.10    12.04      744,498    0.50             8.77           67
    0.00        (1.06)      10.94    15.70      536,983    0.47             9.28           66
    0.00        (0.97)      10.42     8.81      336,310    0.48             9.37           78
    0.00        (0.97)      10.52    10.65      219,976    0.50             8.40          112
    0.00        (0.24)      10.41    24.43+      24,069    0.50+            8.24+          30
    0.00        (1.04)      11.66    14.98       69,937    0.75             8.21           37
    0.00        (1.07)      11.10    11.76       10,428    0.76             8.48           67
    0.00        (1.03)      10.94    15.54        1,007    0.80+            9.16+          66
    0.00        (0.21)      10.41     4.66           41    0.73+           10.12+          78
</TABLE>    
- --------
+ Annualized.
   
(q) Ratio of expenses to average net assets excluding interest expense on
    reverse repurchase agreements is .50%.     
       
                                                   August 1, 1998 Prospectus  12
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
 
<TABLE>   
<CAPTION>
                        NET ASSET               NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS DISTRIBUTIONS
  YEAR OR                 VALUE      NET       AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    IN EXCESS OF
   PERIOD               BEGINNING INVESTMENT   GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    NET REALIZED
   ENDED                OF PERIOD   INCOME      INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS CAPITAL GAINS
- -------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>       <C>          <C>            <C>          <C>        <C>           <C>           <C>
LONG-TERM U.S. GOV'T FUND
 Institutional Class
            3/31/98      $ 9.39     $0.52(+)       $ 1.34 (+)    $ 1.86      $(0.62)     $ 0.00        $(0.06)        $0.00
            3/31/97        9.96      0.79           (0.35)         0.44       (0.68)       0.00          0.00         (0.33)
            3/31/96        9.85      0.83            0.66          1.49       (0.68)      (0.04)        (0.50)        (0.16)
            3/31/95        9.96      0.60           (0.09)         0.51       (0.60)      (0.02)         0.00          0.00
            3/31/94       11.36      0.62           (0.06)         0.56       (1.05)      (0.04)        (0.70)        (0.17)
            3/31/93       10.82      0.70            1.66          2.36       (0.70)       0.00         (1.12)         0.00
            3/31/92(r)    10.00      0.64            0.85          1.49       (0.64)       0.00         (0.03)         0.00
 Administrative Class
            3/31/98(s)    10.17      0.26(+)         0.51(+)       0.77       (0.31)       0.00         (0.06)         0.00
GLOBAL BOND FUND
 Institutional Class
            3/31/98      $ 9.86     $0.66(+)       $(0.10)(+)    $ 0.56      $(0.53)     $ 0.00        $ 0.00        $(0.19)
            3/31/97       10.05      0.70           (0.01)         0.69       (0.44)       0.00         (0.44)         0.00
            3/31/96        9.87      0.45            0.72          1.17       (0.61)       0.00         (0.21)        (0.17)
            3/31/95        9.85      0.69           (0.14)         0.55       (0.29)      (0.24)         0.00          0.00
            3/31/94(t)    10.00      0.16           (0.15)         0.01       (0.16)       0.00          0.00          0.00
 Administrative Class
            3/31/98        9.86      0.59(+)        (0.05)(+)      0.54       (0.51)       0.00          0.00         (0.19)
            3/31/97(u)    10.28      0.51           (0.23)         0.28       (0.26)       0.00         (0.44)         0.00
FOREIGN BOND FUND
 Institutional Class
            3/31/98      $10.41     $0.66(+)       $ 0.61 (+)    $ 1.27      $(0.63)     $ 0.00        $(0.31)       $ 0.00
            3/31/97       10.50      0.80            1.00          1.80       (0.40)       0.00         (1.49)         0.00
            3/31/96        9.38      0.96            1.03          1.99       (0.34)      (0.25)        (0.25)        (0.03)
            3/31/95       10.18      0.38           (0.57)        (0.19)       0.00        0.00          0.00          0.00
            3/31/94       10.34      0.55            0.27          0.82       (0.55)       0.00         (0.06)        (0.37)
            3/31/93(v)    10.00      0.16            0.34          0.50       (0.16)       0.00          0.00          0.00
 Administrative Class
            3/31/98       10.41      0.63 (+)        0.61 (+)      1.24       (0.60)       0.00         (0.31)         0.00
            3/31/97(w)    10.54      0.59           (0.67)        (0.08)      (0.05)       0.00          0.00          0.00
INTERNATIONAL BOND FUND
 Institutional Class
            3/31/98      $ 7.79     $0.64          $ 0.19        $ 0.83      $(0.25)     $ 0.00        $(0.24)       $(0.95)
            3/31/97        8.04      0.84            0.42          1.26       (0.50)       0.00         (1.01)         0.00
            3/31/96        7.44      0.63            0.49          1.12       (0.39)      (0.13)         0.00          0.00
            3/31/95        9.93      2.18           (2.41)        (0.23)      (2.26)       0.00          0.00          0.00
            3/31/94       10.53      0.47            0.24          0.71       (0.96)       0.00         (0.35)         0.00
            3/31/93       10.02      0.62            0.42          1.04       (0.48)       0.00         (0.05)         0.00
            3/31/92        9.94      0.79            0.27          1.06       (0.78)       0.00         (0.20)++       0.00
            3/31/91        9.78      0.79            0.30          1.09       (0.83)       0.00         (0.10)         0.00
            3/31/90(x)    10.00      0.15           (0.27)        (0.12)      (0.10)       0.00          0.00          0.00
EMERGING MARKETS BOND FUND
Institutional Class
            3/31/98(h)   $10.00     $0.46(+)       $(0.18)(+)    $ 0.28      $(0.46)     $ 0.00        $(0.15)       $ 0.00
STRATEGIC BALANCED FUND
 Institutional Class
            3/31/98      $10.32     $1.30(+)       $ 2.05        $ 3.35      $(0.84)     $ 0.00        $(0.23)       $ 0.00
            3/31/97(y)    10.00      0.85            0.31          1.16       (0.63)       0.00         (0.21)         0.00
STOCKSPLUS FUND
 Institutional Class
            3/31/98      $11.46     $1.90(+)       $ 3.23 (+)    $ 5.13      $(1.41)     $ 0.00        $(1.09)       $ 0.00
            3/31/97       11.16      1.27            0.82          2.09       (1.27)       0.00         (0.52)         0.00
            3/31/96       10.48      0.91            2.48          3.39       (1.05)       0.00         (1.62)        (0.04)
            3/31/95        9.52      1.03            0.69          1.72       (0.76)       0.00          0.00          0.00
            3/31/94(z)    10.00      0.34            0.10          0.44       (0.34)      (0.01)        (0.10)        (0.47)
 Administrative Class
            3/31/98       11.46      1.89(+)         3.19 (+)      5.08       (1.39)       0.00         (1.09)         0.00
            3/31/97(aa)   11.56      0.14           (0.09)         0.05       (0.15)       0.00          0.00          0.00
</TABLE>    
- --------
<TABLE>     
<S>                                                                  <C> 
(r) From commencement of operations, July 1, 1991.                   (w) From commencement of operations, January 28, 1997. 
(s) From commencement of operations, September 23, 1997.             (x) From commencement of operations, December 13, 1989. 
(t) From commencement of operations, November 23, 1993.                  Formerly the PIMCO International Fund. 
    Formerly the PIMCO Global Fund.                                  (y) From commencement of operations, June 28, 1996. 
(u) From commencement of operations, July 31, 1996.                  (z) From commencement of operations, May 14, 1993.  
    Formerly the PIMCO Global Fund.                                  (aa) From commencement of operations, January 7, 1997.        
(v) From commencement of operations, December 3, 1992.               ++ Gain distribution includes $0.14 per share characterized 
    Formerly the PIMCO Foreign Fund.                                    for tax purposes as distributions from ordinary income. 
</TABLE>      
                                                                               
 
13  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
 
<TABLE>   
<CAPTION>
                          NET ASSET          NET ASSETS  RATIO OF     RATIO OF NET
TAX BASIS                   VALUE               END     EXPENSES TO    INVESTMENT     PORTFOLIO
  RETURN        TOTAL        END    TOTAL    OF PERIOD    AVERAGE   INCOME TO AVERAGE TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN    (000'S)   NET ASSETS     NET ASSETS       RATE
- -----------------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>      <C>        <C>         <C>               <C>
  $0.00        $(0.68)     $10.57   20.23%   $   48,547    0.51%           4.88%          177%
   0.00         (1.01)       9.39    4.48        19,995    0.63            7.63           402
   0.00         (1.38)       9.96   14.83        32,511    0.56            6.80           238
   0.00         (0.62)       9.85    5.50        32,349    0.50            6.62            89
   0.00         (1.96)       9.96    4.13        25,978    0.50            5.37            98
   0.00         (1.82)      11.36   23.42        22,946    0.50            6.16           320
   0.00         (0.67)      10.82   20.57+       15,900    0.50+           7.91+          428
   0.00         (0.37)      10.57    7.60         4,957    0.76+           4.87+          177
  $0.00        $(0.72)     $ 9.70    5.85%   $  256,274    0.55%           6.64%          389%
   0.00         (0.88)       9.86    6.78       215,631    0.56            7.51           911
   0.00         (0.99)      10.05   12.04       133,833    0.58            5.88         1,083
   0.00         (0.53)       9.87   10.35        76,476    0.64            5.59           461
   0.00         (0.16)       9.85    0.08        40,485    0.50+           4.55+          132
   0.00         (0.70)       9.70    5.57         1,548    0.80            6.39           389
   0.00         (0.70)       9.86    2.97           346    0.78+           5.66+          911
  $0.00        $(0.94)     $10.74   12.64%   $  392,198    0.50%           6.32%          280%
   0.00         (1.89)      10.41   17.69       234,880    0.50            7.88           984
   0.00         (0.87)      10.50   21.80       258,493    0.52            5.83         1,234
  (0.61)        (0.61)       9.38   (1.85)      232,700    0.47            6.44           299
   0.00         (0.98)      10.18    7.79       498,521    0.54            5.12           260
   0.00         (0.16)      10.34   16.23+      178,895    0.65+           4.97+          123
   0.00         (0.91)      10.74   12.34           315    0.75            6.07           280
   0.00         (0.05)      10.41   (0.72)           30    0.79+           7.63+          984
  $0.00        $(1.44)     $ 7.18   11.49%   $  730,622    0.51%           8.17%          255%
   0.00         (1.51)       7.79   15.86       957,950    0.50            7.17           875
   0.00         (0.52)       8.04   15.08     2,271,940    0.50            6.09         1,046
   0.00         (2.26)       7.44   (1.27)       45,950    0.43            5.90           674
   0.00         (1.31)       9.93    6.54     2,296,978    0.43            5.51           370
   0.00         (0.53)      10.53   10.61     2,589,677    0.46            6.67           301
   0.00         (0.98)      10.02   10.97     1,314,661    0.51            8.24           201
   0.00         (0.93)       9.94   11.55       609,660    0.55            8.23           202
   0.00         (0.10)       9.78   (4.18)+     407,210    0.75+           7.94+           49
  $0.00        $(0.61)     $ 9.67    3.10%   $    3,676    0.86%+          7.21%+         695%
  $0.00        $(1.07)     $12.60   33.40%   $   38,806    0.65%          10.84%           56%
   0.00         (0.84)      10.32   11.83        10,360    0.90+           9.72+           95
  $0.00        $(2.50)     $14.09   47.75%   $  416,600    0.65%          13.74%           30%
   0.00         (1.79)      11.46   19.44       235,829    0.65           11.78            47
   0.00         (2.71)      11.16   34.07       151,869    0.70           15.23           102
   0.00         (0.76)      10.48   18.64        46,498    0.50           11.89           177
   0.00         (0.92)       9.52    1.55        14,330    0.50+           4.00+           33
   0.00         (2.48)      14.06   47.19         2,143    0.90           13.49            30
   0.00         (0.15)      11.46    0.34           682    0.95+           4.83+           47
</TABLE>    
 
+ Annualized.
 
                                                   August 1, 1998 Prospectus  14
<PAGE>
 
                      INVESTMENT OBJECTIVES AND POLICIES
 
  The investment objective and general investment policies of each Fund are
described below. There can be no assurance that the investment objective of
any Fund will be achieved. For temporary, defensive or emergency purposes, a
Fund may invest without limit in U.S. debt securities, including short-term
money market securities, when in the opinion of the Adviser it is appropriate
to do so. It is impossible to predict for how long such alternative strategies
will be utilized. Because the market value of each Fund's investments will
change, the net asset value per share of each Fund (except the PIMCO Money
Market Fund) also will vary. Specific portfolio securities eligible for
purchase by the Funds, investment techniques that may be used by the Funds,
and the risks associated with these securities and techniques are described
more fully under "Characteristics and Risks of Securities and Investment
Techniques" in this Prospectus and "Investment Objectives and Policies" in the
Statement of Additional Information.
 
FIXED INCOME FUNDS
 
  With the exception of the PIMCO Strategic Balanced, StocksPLUS and
StocksPLUS Short Strategy Funds, each remaining Fund (together, the "Fixed
Income Funds") differs from the others primarily in the length of the Fund's
duration or the proportion of its investments in certain types of fixed income
securities. For a discussion of the concept of duration, see "Appendix A--
Description of Duration."
   
  The investment objective of the PIMCO Money Market and Short-Term Funds is
to seek to obtain maximum current income consistent with preservation of
capital and daily liquidity. The PIMCO Money Market Fund also attempts to
maintain a stable net asset value of $1.00 per share, although there can be no
assurance that it will be successful in doing so. The investment objective of
the PIMCO Real Return Bond Fund is to seek to realize maximum real return,
consistent with the preservation of real capital and prudent investment
management. For a discussion of "real return," see "Total Return and Real
Return," below. The investment objective of the PIMCO Global Bond Fund II is
to seek maximum total return, consistent with the preservation of capital. The
investment objective of the PIMCO Municipal Bond Fund is to seek high current
income exempt from federal income tax, consistent with preservation of
capital. Capital appreciation is a secondary objective of the PIMCO Municipal
Bond Fund. Each of the remaining Fixed Income Funds seeks to maximize total
return, consistent with preservation of capital and prudent investment
management.     
 
  In selecting securities for each Fixed Income Fund, the Adviser utilizes
economic forecasting, interest rate anticipation, credit and call risk
analysis, foreign currency exchange rate forecasting, and other security
selection techniques. The proportion of each Fund's assets committed to
investment in securities with particular characteristics (such as maturity,
type and coupon rate) will vary based on the Adviser's outlook for the U.S.
and foreign economies, the financial markets, and other factors.
   
  Each of the Fixed Income Funds will invest at least 65% of its assets in the
following types of securities, which, unless specifically provided otherwise
in the descriptions of the Funds that follows, may be issued by domestic or
foreign entities and denominated in U.S. dollars or foreign currencies:
securities issued or guaranteed by the U.S. Government, its agencies or
instrumentalities ("U.S. Government securities"); corporate debt securities,
including convertible securities and corporate commercial paper; mortgage-
backed and other asset-backed securities; inflation-indexed bonds issued by
both governments and corporations; structured notes, including hybrid or
"indexed" securities, catastrophe bonds, and loan participations; delayed
funding loans and revolving credit facilities; bank certificates of deposit,
fixed time deposits and bankers' acceptances; repurchase agreements and
reverse repurchase agreements; debt securities issued by states or local
governments and their agencies, authorities and other instrumentalities;
obligations of foreign governments or their subdivisions, agencies and
instrumentalities; and obligations of international agencies or     
 
15  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
supranational entities. Fixed income securities may have fixed, variable, or
floating rates of interest, including rates of interest that vary inversely at
a multiple of a designated or floating rate, or that vary according to changes
in relative values of currencies. Each of the Fixed Income Funds may hold
different percentages of its assets in these various types of securities, and
each Fund, except the PIMCO Money Market and Municipal Bond Funds, may invest
all of its assets in derivative instruments or in mortgage- or asset-backed
securities. Each of the Fixed Income Funds, except the PIMCO Money Market
Fund, may adhere to its investment policy by entering into a series of
purchase and sale contracts or utilizing other investment techniques by which
it may obtain market exposure to the securities in which it primarily invests.
    
  In addition, each of the Fixed Income Funds may lend its portfolio
securities to brokers, dealers and other financial institutions in order to
earn income. Each of the Fixed Income Funds may purchase and sell options and
futures subject to the limits discussed below, engage in credit spread trades
and enter into forward foreign currency contracts.
 
  The compositions of the Fixed Income Funds differ as follows:
 
  PIMCO MONEY MARKET FUND seeks maximum current income consistent with the
preservation of capital and daily liquidity. It attempts to achieve this
objective by investing at least 95% of its total assets, measured at the time
of investment, in a diversified portfolio of the highest quality money market
securities. The Fund may also invest up to 5% of its total assets, measured at
the time of investment, in money market securities that are in the second-
highest rating category for short-term obligations. The Fund's investments in
securities will be limited to U.S. dollar-denominated securities that mature
in 397 days or less from the date of purchase. The dollar-weighted average
portfolio maturity of the Fund will not exceed 90 days. The Fund may invest in
the following: obligations of the U.S. Government (including its agencies and
instrumentalities); short-term corporate debt securities of domestic and
foreign corporations; obligations of domestic and foreign commercial banks,
savings banks, and savings and loan associations; and commercial paper. The
Fund may invest more than 25% of its total assets in securities or obligations
issued by U.S. banks.
 
  The Fund may invest only in securities that comply with the quality,
maturity and diversification requirements of Rule 2a-7 under the Investment
Company Act of 1940, which regulates money market funds.
   
  PIMCO SHORT-TERM FUND invests in a diversified portfolio of fixed income
securities of varying maturities. The average portfolio duration of this Fund
will normally not exceed one year. The Fund may invest up to 10% of its assets
in fixed income securities that are rated below investment grade (rated below
Baa by Moody's or BBB by S&P) but rated B or higher by Moody's or S&P (or, if
unrated, determined by the Adviser to be of comparable quality). Securities
rated below investment grade may be referred to as "junk bonds." For
information on the risks associated with investments in securities rated below
investment grade, see "Appendix B--Description of Securities Ratings." The
Fund may invest up to 5% of its assets in securities denominated in foreign
currencies, and may invest beyond this limit in U.S. dollar-denominated
securities of foreign issuers.     
 
  PIMCO LOW DURATION FUND invests in a diversified portfolio of fixed income
securities of varying maturities. The average portfolio duration of this Fund
will normally vary within a one- to three-year time frame based on the
Adviser's forecast for interest rates. The Fund may invest up to 10% of its
assets in fixed income securities that are rated below investment grade but
rated B or higher by Moody's or S&P (or, if unrated, determined by the Adviser
to be of comparable quality). For information on the risks associated with
investments in securities rated below investment grade, see "Appendix B--
Description of Securities Ratings." The Fund may invest up to 20% of its
assets in securities denominated in foreign currencies, and may invest beyond
this limit in U.S. dollar-denominated securities of foreign issuers. The total
rate of return for this Fund is expected to exhibit less volatility than that
of the PIMCO Moderate Duration Fund or the PIMCO Total Return Fund because its
duration will be shorter.
 
                                                  August 1, 1998 Prospectus  16
<PAGE>
 
  PIMCO LOW DURATION FUND II has the same policies as the PIMCO Low Duration
Fund, except that its investments in fixed income securities are limited to
those of domestic (U.S.) issuers that are rated at least A by Moody's or S&P
(or, if unrated, determined by the Adviser to be of comparable quality).
 
  PIMCO LOW DURATION FUND III has the same policies as the PIMCO Low Duration
Fund, except that it limits its investments with respect to certain socially
sensitive issues. As a matter of non-fundamental policy, the Fund will not
invest in the securities of any issuer determined by the Adviser to be engaged
principally in the provision of healthcare services, the manufacture of
alcoholic beverages, tobacco products, pharmaceuticals or military equipment,
or the operation of gambling casinos. The Fund will also avoid, to the extent
possible on the basis of information available to the Adviser, the purchase of
securities of issuers engaged in the production or trade of pornographic
materials. An issuer will be deemed to be principally engaged in an activity
if it derives more than 10% of its gross revenues from such activities.
 
  PIMCO LOW DURATION MORTGAGE FUND invests under normal circumstances at least
80% of its assets in a diversified portfolio of mortgage-related securities.
The Fund will not acquire a security if, as a result, more than 10% of the
Fund's total assets would be invested in securities rated below Aaa by Moody's
or AAA by S&P, subject to a minimum rating of Baa by Moody's or BBB by S&P
(or, if unrated, determined by the Adviser to be of comparable quality). The
average portfolio duration of this Fund will normally vary within a one- to
three-year time frame based on the Adviser's view of the potential for total
return offered by a particular duration strategy. The Fund may invest without
limit in U.S. dollar-denominated securities of foreign issuers. The total rate
of return and share price for this Fund are expected to exhibit less
volatility than that of the PIMCO Total Return Mortgage Fund because its
duration will be shorter.
 
  PIMCO MODERATE DURATION FUND invests in a diversified portfolio of fixed
income securities of varying maturities. The average portfolio duration of
this Fund will normally vary within a two- to five-year time frame based on
the Adviser's forecast for interest rates. The Fund may invest up to 10% of
its assets in fixed income securities that are rated below investment grade
but rated B or higher by Moody's or S&P (or, if unrated, determined by the
Adviser to be of comparable quality). For information on the risks associated
with investments in securities rated below investment grade, see "Appendix B--
Description of Securities Ratings." The Fund may invest up to 20% of its
assets in securities denominated in foreign currencies, and may invest beyond
this limit in U.S. dollar-denominated securities of foreign issuers. The total
rate of return for this Fund is expected to exhibit less volatility than that
of the PIMCO Total Return Fund because its duration will normally be shorter.
However, the total rate of return for this Fund is expected to exhibit more
volatility than that of the PIMCO Low Duration Fund because its duration will
normally be longer.
   
  PIMCO REAL RETURN BOND FUND invests under normal circumstances at least 65%
of its total assets in inflation-indexed bonds issued by U.S. and foreign
governments, their agencies or instrumentalities. The Fund may invest up to
10% of its assets in fixed income securities that are rated below investment
grade but rated B or higher by Moody's or S&P (or, if unrated, determined by
the Adviser to be of comparable quality). The Fund may invest up to 35% of its
assets in other types of fixed income instruments, including securities
denominated in foreign currencies, (and the Fund may also invest beyond this
limit in U.S. dollar-denominated securities of foreign issuers).     
 
  Inflation-indexed bonds are fixed income securities whose principal value is
periodically adjusted according to the rate of inflation. Such bonds generally
are issued at an interest rate lower than non-inflation related bonds, but are
expected to retain their value against inflation over time. For a more
complete discussion of inflation-indexed bonds, including the risks associated
with investing in such securities, see "Characteristics and Risks of
Securities and Investment Techniques--Inflation-Indexed Bonds." See
"Dividends, Distributions and Taxes" for information about the possible tax
consequences of investing in the Fund and in inflation-indexed bonds.
 
17  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
  In managing fixed income securities, one of the principal tools generally
used by the Adviser is "duration," which is a measure of the expected life of
a fixed income security on a present value basis, incorporating a bond's
yield, coupon interest payments, final maturity and call features. See
"Appendix A--Description of Duration." Because of the unique features of
inflation-indexed bonds, the Adviser utilizes a modified form of duration for
the PIMCO Real Return Bond Fund ("modified real duration") which measures
price changes in such bonds as a result of changes in real, rather than
nominal, interest rates. Although there is no limit on the modified real
duration of the PIMCO Real Return Bond Fund, it is expected that the average
modified real duration of the Fund will normally vary approximately within the
range of the average modified real duration of all inflation-indexed bonds
issued by the U.S. Treasury in the aggregate.     
 
  PIMCO TOTAL RETURN FUND invests under normal circumstances at least 65% of
its assets in a diversified portfolio of fixed income securities of varying
maturities. The average portfolio duration of this Fund will normally vary
within a three- to six-year time frame based on the Adviser's forecast for
interest rates. The Fund may invest up to 10% of its assets in fixed income
securities that are rated below investment grade but rated B or higher by
Moody's or S&P (or, if unrated, determined by the Adviser to be of comparable
quality). For information on the risks associated with investments in
securities rated below investment grade, see "Appendix B--Description of
Securities Ratings." The Fund may also invest up to 20% of its assets in
securities denominated in foreign currencies, and may invest beyond this limit
in U.S. dollar-denominated securities of foreign issuers. Portfolio holdings
will be concentrated in areas of the bond market (based on quality, sector,
coupon or maturity) which the Adviser believes to be relatively undervalued.
The total rate of return for this Fund is expected to exhibit less volatility
than that of the PIMCO Long-Term U.S. Government Fund because its duration
will normally be shorter.
 
  PIMCO TOTAL RETURN FUND II has the same policies as the PIMCO Total Return
Fund, except that its investments in fixed income securities are limited to
those of domestic (U.S.) issuers that are rated at least Baa by Moody's or BBB
by S&P (or, if unrated, determined by the Adviser to be of comparable
quality).
 
  PIMCO TOTAL RETURN FUND III has the same policies as the PIMCO Total Return
Fund, except that it limits its investments with respect to certain socially
sensitive issues in the same manner as the PIMCO Low Duration Fund III.
   
  PIMCO TOTAL RETURN MORTGAGE FUND has the same policies as the PIMCO Low
Duration Mortgage Fund, except that its average portfolio duration will
normally vary within a two- to six-year time frame based on the Adviser's view
of the potential for total return offered by a particular duration strategy.
    
  PIMCO COMMERCIAL MORTGAGE SECURITIES FUND invests at least 65% of its assets
in commercial mortgage-backed securities rated at least Baa by Moody's or BBB
by S&P (or, if unrated, determined by the Adviser to be of comparable
quality). The Fund also may invest up to 35% of its assets in lower-rated
securities (but rated at least B, or, if unrated, determined by the Adviser to
be of comparable quality) if such securities are considered by the Adviser to
have attractive investment characteristics. For information on the risks
associated with investments in securities rated below investment grade, see
"Appendix B--Description of Securities Ratings." The average portfolio
duration of this Fund will normally vary within a three- to eight-year time
frame depending on the Adviser's view of the potential for total return
offered by a particular duration strategy. The Fund may invest in securities
of foreign issuers, but only those that are U.S. dollar-denominated.
 
  PIMCO HIGH YIELD FUND invests under normal circumstances at least 65% of its
assets in a diversified portfolio of fixed income securities rated lower than
Baa by Moody's or lower than BBB by S&P but rated at least B by Moody's or
 
                                                  August 1, 1998 Prospectus  18
<PAGE>
 
   
S&P (or, if unrated, determined by the Adviser to be of comparable quality).
Securities rated below investment grade may be referred to as "junk bonds."
The remainder of the Fund's assets may be invested in investment grade (i.e.,
securities rated at least Baa by Moody's or BBB by S&P, or, if unrated, deemed
by the Adviser to be of comparable quality) fixed income securities. The
average portfolio duration of this Fund will normally vary within a two- to
six-year time frame depending on the Adviser's view of the potential for total
return offered by a particular duration strategy. The Fund may invest in
securities of foreign issuers, but only those that are U.S. dollar-
denominated. The Fund may also engage in hedging strategies involving equity
options.     
 
  Investments in high yield securities, while generally providing greater
potential opportunity for capital appreciation and higher yields than
investments in higher rated securities, also entail greater risk, including
the possibility of default or bankruptcy of the issuer of such securities.
Risk of default or bankruptcy may be greater in periods of economic
uncertainty or recession, as the issuers of high yield securities may be less
able to withstand general economic downturns. The Adviser seeks to reduce risk
through diversification, credit analysis and attention to current developments
and trends in both the economy and financial markets. The value of all fixed
income securities, including those held by the Fund, can be expected to change
inversely with interest rates. For a further discussion of the special risks
of investing in lower rated securities, see "Characteristics and Risks of
Securities and Investment Techniques--High Yield Securities ("Junk Bonds")."
 
  PIMCO LONG-TERM U.S. GOVERNMENT FUND invests in a diversified portfolio of
primarily U.S. Government securities, which may be represented by futures
contracts (including related options) with respect to such securities, and
options on such securities, when the Adviser deems it appropriate to do so.
The Fund will have a minimum average portfolio duration of eight years. For
point of reference, the dollar-weighted average portfolio maturity of the Fund
is normally expected to be more than ten years. The total rate of return is
expected to exhibit more volatility than that of the other Fixed Income Funds
due to the greater investment risk normally associated with longer duration
investments. The PIMCO Long-Term U.S. Government Fund's investments in fixed
income securities are limited to those of U.S. dollar-denominated securities
of domestic (U.S.) issuers that are rated at least A by Moody's or S&P (or, if
unrated, determined by the Adviser to be of comparable quality). In addition,
the Fund will not acquire a security if, as a result, more than 10% of the
Fund's total assets would be invested in securities rated below Aa by Moody's
or below AA by S&P, or if more than 25% of the Fund's total assets would be
invested in securities rated Aa by Moody's or AA by S&P.
 
  PIMCO GLOBAL BOND FUND invests in a portfolio of fixed income securities
denominated in major foreign currencies, baskets of foreign currencies (such
as the ECU), and the U.S. dollar. Under normal circumstances, at least 65% of
its assets will be invested in fixed income securities of issuers located in
at least three countries (one of which may be the United States), which may be
represented by futures contracts (including related options) with respect to
such securities, and options on such securities, when the Adviser deems it
appropriate to do so. Depending on the Adviser's current opinion as to the
proper allocation of assets among domestic and foreign issuers, investments in
the securities of issuers located outside the United States will normally vary
between 25% and 75% of the Fund's assets. The Fund may invest up to 10% of its
assets in fixed income securities that are rated below investment grade but
rated B or higher by Moody's or S&P (or, if unrated, determined by the Adviser
to be of comparable quality). For information on the risks associated with
investments in securities rated below investment grade, see "Appendix B--
Description of Securities Ratings." The average portfolio duration of this
Fund will normally vary within a three- to six-year time frame.
 
  PIMCO GLOBAL BOND FUND II has the same policies as the PIMCO Global Bond
Fund, except as set forth below. The PIMCO Global Bond Fund II expects to
hedge its foreign currency exposure so that generally no more than 25% of the
Fund's total net assets will be invested in unhedged foreign currency-
denominated securities. The PIMCO Global
 
19  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
Bond Fund II may not borrow in excess of 10% of the value of its total assets
and then only from banks as a temporary measure to facilitate the meeting of
redemption requests (not for leverage), or for extraordinary or emergency
purposes. The PIMCO Global Bond Fund II may only engage in short sales that
are "against the box," and may not loan its portfolio securities if their
market value exceeds 25% of the total assets of the Fund. In addition, the
PIMCO Global Bond Fund II is subject to different fundamental and non-
fundamental investment restrictions than the PIMCO Global Bond Fund. See
"Investment Restrictions" in this Prospectus and in the Statement of
Additional Information.
 
  PIMCO FOREIGN BOND FUND invests in a portfolio of fixed income securities
primarily denominated in major foreign currencies and baskets of foreign
currencies (such as the European Currency Unit, or "ECU"). The Adviser will
invest the assets of the Fund in a number of international bond markets so
that, under normal circumstances, the Fund will invest at least 85% of its
assets in securities of issuers located outside the United States,
representing at least three foreign countries, which may be represented by
futures contracts (including related options) with respect to such securities,
and options on such securities, when the Adviser deems it appropriate to do
so. The Fund may invest up to 10% of its assets in fixed income securities
that are rated below investment grade but rated B or higher by Moody's or S&P
(or, if unrated, determined by the Adviser to be of comparable quality). For
information on the risks associated with investments in securities rated below
investment grade, see "Appendix B--Description of Securities Ratings." The
average portfolio duration of this Fund will normally vary within a three- to
six-year time frame.
 
  The PIMCO Foreign Bond Fund differs from the PIMCO Global Bond and Global
Bond II Funds primarily in the extent to which assets are invested in the
securities of issuers located outside the United States. The Adviser will
select these Funds' foreign country and currency compositions based on an
evaluation of relative interest rates, exchange rates, monetary and fiscal
policies, trade and current account balances, and any other specific factors
the Adviser believes to be relevant.
 
  PIMCO INTERNATIONAL BOND FUND is available only to private account clients
of PIMCO. The Fund invests in a portfolio of fixed income securities
denominated in major foreign currencies, baskets of foreign currencies, and
the U.S. dollar. The Adviser will invest the assets of the Fund in a number of
international bond markets so that, under normal conditions, the Fund will
invest at least 65% of its assets in fixed income securities of foreign
issuers representing at least three foreign countries or currencies, which may
be represented by futures contracts (including related options) with respect
to such securities, and options on such securities, when the Adviser deems it
appropriate to do so. The PIMCO International Bond Fund will invest only in
investment grade securities, i.e., in securities rated at least Baa by Moody's
or BBB by S&P (or, if unrated, deemed by the Adviser to be of comparable
quality). The average portfolio duration of this Fund will vary based on the
strategy currently being used by the Adviser in managing the assets of the
Fund within the overall PIMCO private account management program, but is
normally not expected to exceed eight years. The Adviser will select the
Fund's foreign country and currency composition based on its evaluation of
relative interest rates, inflation rates, exchange rates, monetary and fiscal
policies, trade and current account balances, and any other specific factors
the Adviser believes to be relevant.
 
  PIMCO EMERGING MARKETS BOND FUND invests in a portfolio of fixed income
securities denominated in foreign currencies and the U.S. dollar. Under normal
market conditions, the Fund will invest at least 80% of its assets in fixed
income securities of issuers that economically are tied to countries with
emerging securities markets. The Fund may invest up to 20% of its assets in
other types of fixed income instruments, including securities of issuers
located in, or securities denominated in currencies of, countries with
developed foreign securities markets. The Fund also may invest up to 10% of
its assets in shares of investment companies that invest primarily in emerging
market debt securities. The average portfolio duration of the Fund will vary
based on the Adviser's view of the potential for total return offered by a
particular duration strategy and, under normal market conditions, is not
expected to exceed eight years.
 
                                                  August 1, 1998 Prospectus  20
<PAGE>
 
  The Adviser has broad discretion to identify and invest in countries that it
considers to qualify as emerging securities markets. However, the Adviser
generally considers an emerging securities market to be one located in any
country that is defined as an emerging or developing economy by any of the
following: the International Bank for Reconstruction and Development (i.e.,
the World Bank), including its various offshoots, such as the International
Finance Corporation, or the United Nations or its authorities. The Fund's
investments in emerging market fixed income securities may be represented by
futures contracts (including related options) with respect to such securities,
options on such securities, equity securities (including common stocks) upon
the conversion of convertible securities, or securities the return on which is
derived primarily from emerging securities markets, when the Adviser deems it
appropriate to do so.
 
  The Fund emphasizes countries with relatively low gross national product per
capita and with the potential for rapid economic growth. The Adviser will
select the Fund's country and currency composition based on its evaluation of
relative interest rates, inflation rates, exchange rates, monetary and fiscal
policies, trade and current account balances, and any other specific factors
the Adviser believes to be relevant. The Fund likely will concentrate its
investments in Asia, Africa, the Middle East, Latin America and the developing
countries of Europe. Accordingly, the Fund will be particularly susceptible to
the effects of political and economic developments in these regions. This
effect may be exacerbated by a relative scarcity of issuers in certain of
these markets, which may result in the Fund being highly concentrated in a
small number of issuers. For a further discussion of the special risks of
investing in foreign and emerging market countries, see "Characteristics and
Risks of Securities and Investment Techniques--Foreign Securities."
 
  The Fund may invest substantially all of its assets in securities rated
below investment grade but rated B or higher by Moody's or S&P (or, if
unrated, determined by the Adviser to be of comparable quality). Such
securities are colloquially referred to as "junk bonds." While these
securities generally provide greater potential opportunity for capital
appreciation and higher yields than investments in higher rated securities,
they also entail greater risk, including the possibility of default or
bankruptcy of the issuer of the securities. Risk of default or bankruptcy may
be greater in periods of economic uncertainty or recession, as the issuers may
be less able to withstand general economic downturns affecting the regions in
which the Fund invests. The Adviser seeks to reduce risk through
diversification, credit analysis and attention to current developments and
trends in emerging market economies and markets. The value of most fixed
income securities, including those held by the Fund, can be expected to change
inversely with interest rates. For a further discussion of the special risks
of investing in lower rated securities, see "Characteristics and Risks of
Securities and Investment Techniques--High Yield Securities ("Junk Bonds")."
 
  PIMCO EMERGING MARKETS BOND FUND II  is available only to private account
clients of PIMCO. The Fund has the same policies as the PIMCO Emerging Markets
Bond Fund, except that the Fund (i) may only invest up to 15% of its assets in
securities denominated in currencies of emerging market countries, and (ii)
may only invest up to 10% of its assets in securities rated B by Moody's or
S&P (or, if unrated, determined by the Adviser to be of comparable quality).
 
  Each of the PIMCO Real Return Bond, Foreign Bond, Global Bond, Global Bond
II, International Bond, Emerging Markets Bond and Emerging Markets Bond II
Funds will normally invest at least 80% of its total assets in "bonds." For
this purpose, each of these Funds considers the various types of debt or fixed
income securities in which it invests, as specifically described elsewhere in
this Prospectus, to be "bonds" as referenced in that Fund's name. The use of
this name is not meant to restrict a Fund's investment to the narrow category
of debt securities that are formally called "bonds."
 
  As a non-fundamental, operating policy, the Adviser intends to use foreign
currency-related derivative instruments (currency futures and related options,
currency options, forward contracts and swap agreements) in an effort to hedge
foreign currency risk with respect to at least 75% of the assets of the Fixed
Income Funds (other than the PIMCO Global
 
21  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
Bond, Emerging Markets Bond and Emerging Markets Bond II Funds) denominated in
currencies other than the U.S. dollar. There can be no assurance that the
Adviser will be successful in doing so. The active use of currency derivatives
involves transaction costs which may adversely effect yield and return.
 
  The PIMCO Real Return Bond, Commercial Mortgage Securities, Foreign Bond,
Global Bond, Global Bond II, International Bond, Emerging Markets Bond and
Emerging Markets Bond II Funds are "non-diversified" for purposes of the 1940
Act, meaning that they may invest a greater percentage of their assets in the
securities of one issuer than the other Funds. The Funds are still, however,
subject to diversification requirements imposed by the Internal Revenue Code
of 1986, as amended, which means that as of the end of each calendar quarter,
a Fund may have no more than 25% of its assets invested in the securities of a
single issuer, and may, with respect to 50% of its assets, have no more than
5% of its assets invested in the securities of a single issuer. As "non-
diversified" portfolios, these Funds may be more susceptible to risks
associated with a single economic, political or regulatory occurrence than a
diversified portfolio might be.
 
  PIMCO MUNICIPAL BOND FUND seeks high current income exempt from federal
income tax, consistent with preservation of capital. Capital appreciation is a
secondary objective. The Fund seeks its objectives by investing in debt
securities whose interest is, in the opinion of bond counsel for the issuer at
the time of issuance, exempt from federal income tax ("Municipal Bonds").
Municipal Bonds generally are issued by states and local governments and their
agencies, authorities and other instrumentalities. It is a policy of the Fund
that, under normal market conditions, at least 80% of its net assets will be
invested in Municipal Bonds. The Fund may invest up to 20% of net assets in
U.S. Government securities, money market instruments and/or "private activity"
bonds. Under normal circumstances, the average portfolio duration of the PIMCO
Municipal Bond Fund will vary within a three- to ten-year time frame, based on
the Adviser's forecast for interest rates.
 
  The Fund may invest up to 10% of its net assets, under normal market
conditions, in Municipal Bonds or "private activity" bonds which are rated
below Baa by Moody's or BBB by S&P but which are rated at least Ba by Moody's
or BB by S&P (or, if unrated, determined by the Adviser to be of comparable
quality). For information on the risks associated with investments in
securities rated below investment grade, see "Appendix B--Description of
Securities Ratings."
 
STOCK AND BOND FUNDS
   
  PIMCO STRATEGIC BALANCED FUND has as its investment objective the
maximization of total return, consistent with preservation of capital and
prudent investment management. In seeking to achieve this objective, the Fund
invests in the securities eligible for purchase by the PIMCO StocksPLUS and
Total Return Funds. The percentage of the Fund's assets allocated to equity or
fixed income exposure will vary in accordance with an asset allocation
methodology developed by the Adviser. The methodology builds upon the
Adviser's long-standing process of economic forecasting of business cycle
stages by applying to this process a disciplined asset allocation model which
employs certain statistical variance techniques. Depending on the outcome of
this asset allocation methodology, the Fund's equity exposure will vary
between 45% and 75% of its total assets, and its fixed income exposure will
vary between 25% and 55%. There can be no assurance that the Adviser's asset
allocation methodology will be successful.     
 
STOCK FUNDS
   
  The Stock Funds are the PIMCO StocksPLUS and StocksPLUS Short Strategy
Funds. The investment objective of PIMCO StocksPLUS Fund is to seek to achieve
a total return which exceeds the total return performance of the S&P 500. The
investment objective of the PIMCO StocksPLUS Short Strategy Fund is to seek
total return through the implementation of short investment positions on the
S&P 500.     
 
                                                  August 1, 1998 Prospectus  22
<PAGE>
 
  Each of the Stock Funds invests in common stocks, options, futures, options
on futures and swaps consistent with its portfolio management strategy as set
forth below. Assets not invested in equity securities may be invested in
securities eligible for purchase by the Fixed Income Funds. Each of the Stock
Funds may invest up to 10% of its assets in fixed income securities that are
below "investment grade," i.e., rated below Baa by Moody's or BBB by S&P, but
at least B (or, if unrated, determined by the Adviser to be of comparable
quality). In addition, each of the Stock Funds may lend its portfolio
securities to brokers, dealers and other financial institutions in order to
earn income. Each of the Stock Funds may invest all of its assets in
derivative instruments, as described below and under "Characteristics of
Securities and Investment Techniques--Derivative Instruments." Each of the
Stock Funds may invest up to 20% of its assets in securities of foreign
issuers, may purchase and sell options and futures on foreign currencies, and
may enter into forward currency contracts.
 
  The Stock Funds differ in composition or strategy as follows:
 
  PIMCO STOCKSPLUS FUND StocksPLUS is the name of a proprietary portfolio
management strategy which utilizes S&P 500 derivatives in addition to or in
place of S&P 500 stocks in an attempt to equal or exceed the performance of
the S&P 500. The Adviser expects that under normal market conditions, the Fund
will invest substantially all of its assets in S&P 500 derivatives, backed by
a portfolio of fixed income securities. The Adviser will actively manage the
fixed income assets serving as cover for derivatives, as well as any other
fixed income assets held by the Fund, with a view toward enhancing the Fund's
total return investment performance, subject to an overall portfolio duration
which is normally not expected to exceed one year. See "Appendix A--
Description of Duration."
 
  The S&P 500 is composed of 500 selected common stocks, most of which are
listed on the New York Stock Exchange. S&P chooses the stocks to be included
in the S&P 500 solely on a statistical basis. The weightings of stocks in the
index are based on each stock's relative total market value, that is, its
market price per share times the number of shares outstanding. Stocks
represented currently in the S&P 500 represent approximately two-thirds of the
total market value of all U.S. common stocks. The Fund is neither sponsored by
nor affiliated with S&P. The Fund will seek to remain invested in S&P 500
derivatives or S&P 500 stocks even when the S&P 500 is declining.
 
  When S&P 500 derivatives appear to be overvalued relative to the S&P 500,
the Fund may invest up to 100% of its assets in a "basket" of S&P 500 stocks.
The composition of this basket will be determined by standard statistical
techniques that analyze the historical correlation between the return of every
stock currently in the S&P 500 and the return on the S&P 500 itself. The
Adviser may employ fundamental stock analysis only to choose among stocks that
have already satisfied the statistical correlation tests. Stocks chosen for
the Fund are not limited to those with any particular weighting in the S&P
500.
 
  Positions in S&P 500 futures and options on futures will be entered into
only to the extent they constitute permissible positions for the Fund
according to applicable rules of the Commodity Futures Trading Commission
("CFTC"). From time to time, the Adviser may be constrained in its ability to
use S&P 500 derivatives either by requirements of the Internal Revenue Code or
by an unanticipated inability to close out positions when it would be most
advantageous to do so. A large number of investors use S&P 500 derivatives for
both hedging and speculative purposes, and although generally this helps
guarantee a liquid market in those instruments, at times liquidity may be
limited. For more information about S&P 500 derivatives, see "Characteristics
and Risks of Securities and Investment Techniques--Derivative Instruments."
   
  To the extent that the Fund invests in S&P 500 derivatives backed by a
portfolio of fixed income securities, under certain conditions, generally in a
market where the value of both S&P 500 derivatives and fixed income securities
are     
 
23  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
declining, the Fund may experience greater losses than would be the case if it
were to invest directly in a portfolio of S&P 500 stocks.     
 
  PIMCO STOCKSPLUS SHORT STRATEGY FUND invests primarily in S&P 500 short
positions such that the Fund's net asset value is generally expected to vary
inversely to the value of the S&P 500. The Fund is designed for investors
seeking to take advantage of declines in the value of the S&P 500, or
investors wishing to hedge existing long equity positions. The Fund will
generally realize gains only when the price of the S&P 500 is declining. When
the S&P 500 is rising, the Fund will generally incur a loss.
   
  The Fund will maintain short positions through the use of a combination of
S&P 500 derivatives, including options, futures and swap agreements. All S&P
500 derivatives will be covered by the segregation of assets determined to be
liquid by the Adviser in accordance with procedures established by the Board
of Trustees, or through the maintenance of offsetting positions. It is
anticipated that the Fund will generally remain fully invested in S&P 500
short positions at all times, even during periods when the S&P 500 is rising.
However, the Fund may purchase call options on S&P 500 futures contracts from
time to time in an effort to limit the total potential decline in the Fund's
net asset value. There can be no assurance that the use of such call options
would be effective in limiting the potential decline in net asset value of the
Fund.     
 
  The Adviser will actively manage the fixed income portion of the Fund's
investment portfolio that is used as coverage for S&P 500 derivatives in an
attempt to provide incremental returns. Thus, there will not be a perfect
inverse correlation between the performance of the S&P 500 and the performance
of the Fund. A perfect inverse correlation would exist if the net asset value
of the Fund, including the value of its dividend and capital gains
distributions, increased in exact proportion to decreases in the S&P 500 (or
decreased in exact proportion to increases in the S&P 500). Rather, because of
the Adviser's management of the fixed income securities that are held by the
Fund as cover for the Fund's short positions, it is expected that, if the
value of the S&P 500 were to decrease by 10%, for example, the amount by which
the Fund's net asset value would increase would be an amount slightly in
excess of 10%. Conversely, an increase in the S&P 500 of 10% would result in a
loss to the Fund of slightly less than this amount. There can be no assurance
that the use of such active fixed income management techniques will produce
the intended results.
 
TOTAL RETURN AND REAL RETURN
 
  The "total return" sought by certain of the Funds will consist of interest
and dividends from underlying securities, capital appreciation reflected in
unrealized increases in value of portfolio securities (realized by the
shareholder only upon selling shares), or realized from the purchase and sale
of securities and use of futures and options, or gains from favorable changes
in foreign currency exchange rates. Generally, over the long term, the total
return obtained by a portfolio investing primarily in fixed income securities
is not expected to be as great as that obtained by a portfolio that invests
primarily in equity securities. At the same time, the market risk and price
volatility of a fixed income portfolio is expected to be less than that of an
equity portfolio, so that a fixed income portfolio is generally considered to
be a more conservative investment. The change in market value of fixed income
securities (and therefore their capital appreciation or depreciation) is
largely a function of changes in the current level of interest rates.
Generally, when interest rates are falling, a portfolio with a shorter
duration will not generate as high a level of total return as a portfolio with
a longer duration. Conversely, when interest rates are rising, a portfolio
with a shorter duration will generally outperform longer duration portfolios.
When interest rates are flat, shorter duration portfolios generally will not
generate as high a level of total return as longer duration portfolios
(assuming that long-term interest rates are higher than short-term rates,
which is commonly the case). With respect to the composition of any fixed
income portfolio, the longer the duration of the portfolio, the greater the
anticipated potential for total return, with, however, greater attendant
market risk and price
 
                                                  August 1, 1998 Prospectus  24
<PAGE>
 
volatility than for a portfolio with a shorter duration. The market value of
fixed income securities denominated in currencies other than the U.S. dollar
also may be affected by movements in foreign currency exchange rates.
 
  The change in market value of equity securities (and therefore their capital
appreciation or depreciation) may depend upon a number of factors, including:
conditions in the securities markets, the business success of the security's
issuer, changing interest rates, real or perceived economic and competitive
industry conditions, and foreign currency exchange rates. Historically, the
total return performance of equity-oriented portfolios has generally been
greater over the long term than fixed income portfolios. However, the market
risk and price volatility of an equity portfolio is generally greater than
that of a fixed income portfolio, and is generally considered to be a more
aggressive investment.
 
  "Real Return," or "Inflation Adjusted Return," as referenced in the name and
investment objective of the PIMCO Real Return Bond Fund, is a measure of the
change in purchasing power of money invested in a particular instrument after
adjusting for inflation. An investment in a security generating a high nominal
return (such as a typical U.S. Government Treasury bond) may not generate a
high real return once inflation is considered. For example, an instrument
generating a 9% nominal return at a time when inflation is 6% has a real
return of approximately 3%; that is, the purchasing power of the money
invested in that instrument would only increase by approximately 3%. On the
other hand, an inflation-indexed instrument generating a 5% real return would
generate a 5% increase in purchasing power regardless of the rate of
inflation. As stated above, the investment objective of the Fund is to seek to
achieve maximum real return. The total return (not adjusted for inflation)
attained by this Fund may be less than the total return attained by other of
the PIMCO Funds that do not invest primarily in inflation-indexed securities.
 
  In the case of inflation-indexed bonds, changes in market value are tied to
the relationship between nominal interest rates and the rate of inflation. If
inflation were to rise at a faster rate than nominal interest rates, real
interest rates might decline, leading to an increase in value of inflation-
indexed bonds. In contrast, if nominal interest rates increase at a faster
rate than inflation, real interest rates might increase, leading to a decrease
in value of inflation-indexed bonds.
 
                            INVESTMENT RESTRICTIONS
 
  Each Fund's investment objective (except the PIMCO Global Fund II) as set
forth under "Investment Objectives and Policies," and the investment
restrictions set forth below are fundamental policies of the Fund and may not
be changed with respect to a Fund without shareholder approval by vote of a
majority of the outstanding shares of that Fund. Under these restrictions, a
Fund may not:
 
  (1) (a) invest in a security if, as a result of such investment, more than 25%
          of its total assets (taken at market value at the time of such
          investment) would be invested in the securities of issuers in any
          particular industry, or, in the case of the PIMCO Municipal Bond Fund,
          an industrial development revenue bonds based, directly or indirectly,
          on the credit of private entities in any one industry; except that
          this restriction does not apply (i) to securities issued or guaranteed
          by the U.S. Government or its agencies or instrumentalities (or
          repurchase agreements with respect thereto) and (ii) with respect to
          the Money Market Fund, to securities or obligations issued by U.S.
          banks. Investments of the PIMCO Municipal Bond Fund, in utilities,
          gas, electric water and telephone companies will be considered as
          being in separate industries;
 
      (b) for the Global Bond Fund II, concentrate more than 25% of the value of
          its total assets in any one industry (The SEC staff takes the position
          that investments in government securities of a single foreign country,
          including agencies and instrumentalities of such government, to the
          extent such obligations are backed by the assets and revenues of such
          government, represent investments in a separate industry for these
          purposes.);
 
 
25  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
  (2) with respect to 75% of its assets, invest in a security if, as a result
      of such investment, more than 5% of its total assets (taken at market
      value at the time of such investment) would be invested in the
      securities of any one issuer, except that this restriction does not
      apply to securities issued or guaranteed by the U.S. Government or its
      agencies or instrumentalities (This investment restriction is not
      applicable to the PIMCO Real Return Bond, Commercial Mortgage
      Securities, Global Bond, Global Bond II, Foreign Bond, International
      Bond, Emerging Markets Bond or Emerging Markets Bond II Funds). For the
      purpose of this restriction, each state and each separate political
      subdivision, agency, authority or instrumentality of such state, each
      multi-state agency or authority, and each guarantor, if any, are treated
      as separate issuers of Municipal Bonds;     
   
  (3) with respect to 75% of its assets, invest in a security if, as a result
      of such investment, it would hold more than 10% (taken at the time of
      such investment) of the outstanding voting securities of any one issuer
      (This restriction is not applicable to the Real Return Bond, Commercial
      Mortgage Securities, Global Bond, Global Bond II, Foreign Bond,
      International Bond, Emerging Markets Bond or Emerging Markets Bond II
      Funds);     
 
  (4) (a) purchase or sell real estate, although it may purchase securities
          secured by real estate or interests therein, or securities issued by
          companies which invest in real estate or interests therein;
 
      (b) for the Global Bond Fund II, purchase or sell real estate, although
          it may purchase securities of issuers which deal in real estate,
          including securities of real estate investment trusts, and may
          purchase securities which are secured by interests in real estate;
 
  (5) purchase or sell commodities or commodities contracts or oil, gas or
      mineral programs. This restriction shall not prohibit a Fund, subject to
      restrictions described in this Prospectus and in the Statement of
      Additional Information, from purchasing, selling or entering into
      futures contracts, options on futures contracts, foreign currency
      forward contracts, foreign currency options, or any interest rate,
      securities-related or foreign currency-related hedging instrument,
      including swap agreements and other derivative instruments, subject to
      compliance with any applicable provisions of the federal securities or
      commodities laws (this restriction is not applicable to the Global Bond
      Fund II.);
 
  (6) for the Total Return III, High Yield, International Bond and StocksPLUS
      Funds: purchase securities on margin, except for use of short-term
      credit necessary for clearance of purchases and sales of portfolio
      securities, but it may make margin deposits in connection with
      transactions in options, futures, and options on futures;
 
  (7) (a) borrow money, issue senior securities, or pledge, mortgage or
          hypothecate its assets, except that a Fund may (i) borrow from banks
          or enter into reverse repurchase agreements, or employ similar
          investment techniques, and pledge its assets in connection
          therewith, but only if immediately after each borrowing there is
          asset coverage of 300% and (ii) enter into transactions in options,
          futures, options on futures, and other derivative instruments as
          described in this Prospectus and in the Statement of Additional
          Information (the deposit of assets in escrow in connection with the
          writing of covered put and call options and the purchase of
          securities on a when-issued or delayed delivery basis, collateral
          arrangements with respect to initial or variation margin deposits
          for futures contracts, and commitments entered into under swap
          agreements or other derivative instruments will not be deemed to be
          pledges of a Fund's assets);
 
      (b) for the Global Bond Fund II: (i) borrow money in excess of 10% of
          the value (taken at the lower of cost or current value) of the
          Fund's total assets (not including the amount borrowed) at the time
          the borrowing is made, and then only from banks as a temporary
          measure to facilitate the meeting of redemption requests (not for
          leverage) which might otherwise require the untimely disposition of
          portfolio investments or for extraordinary or emergency purposes
          (Such borrowings will be repaid before any additional investments
          are purchased.); or (ii) pledge, hypothecate, mortgage or otherwise
          encumber its assets in excess of 10% of the
 
                                                  August 1, 1998 Prospectus  26
<PAGE>
 
        Fund's total assets (taken at cost) and then only to secure borrowings
        permitted above; (The deposit of securities or cash or cash
        equivalents in escrow in connection with the writing of covered call
        or put options, respectively, is not deemed to be pledges or other
        encumbrances.) (For the purpose of this restriction, collateral
        arrangements with respect to the writing of options, futures
        contracts, options on futures contracts, and collateral arrangements
        with respect to initial and variation margin are not deemed to be a
        pledge of assets and neither such arrangements nor the purchase or
        sale of futures or related options are deemed to be the issuance of a
        senior security.)
 
  (8) lend any funds or other assets, except that a Fund may, consistent with
      its investment objective and policies: (a) invest in debt obligations,
      including bonds, debentures, or other debt securities, bankers'
      acceptances and commercial paper, even though the purchase of such
      obligations may be deemed to be the making of loans, (b) enter into
      repurchase agreements, and (c) lend its portfolio securities in an
      amount not to exceed one-third of the value of its total assets,
      provided such loans are made in accordance with applicable guidelines
      established by the Securities and Exchange Commission and the Trustees
      of the Trust. (This restriction is not applicable to the Global Bond
      Fund II.)
 
  (9) (a) act as an underwriter of securities of other issuers, except to the
          extent that in connection with the disposition of portfolio
          securities, it may be deemed to be an underwriter under the federal
          securities laws; or
 
      (b) for the Global Bond Fund II, underwrite securities issued by other
          persons except to the extent that, in connection with the
          disposition of its portfolio investments, it may be deemed to be an
          underwriter under federal securities laws; or
 
  (10)(a) for the Total Return III, High Yield, and StocksPLUS Funds: maintain
          a short position, or purchase, write or sell puts, calls, straddles,
          spreads or combinations thereof, except as set forth in this
          Prospectus and in the Statement of Additional Information for
          transactions in options, futures, options on futures, and
          transactions arising under swap agreements or other derivative
          instruments;
 
      (b) for the Money Market, Short-Term, Low Duration, Low Duration II, Low
          Duration III, Low Duration Mortgage, Moderate Duration, Real Return
          Bond, Total Return, Total Return II, Total Return Mortgage,
          Commercial Mortgage Securities, Long-Term U.S. Government, Global
          Bond, Foreign Bond, International Bond, Emerging Markets Bond,
          Emerging Markets Bond II, Strategic Balanced and StocksPLUS Short
          Strategy Funds: maintain a short position, or purchase, write or
          sell puts, calls, straddles, spreads or combinations thereof, except
          on such conditions as may be set forth in this Prospectus and in the
          Statement of Additional Information.
   
  To the extent a Fund covers its commitment under a reverse repurchase
agreement (or economically similar transaction) by the segregation of assets
determined to be liquid in accordance with procedures adopted by the Trustees,
equal in value to the amount of the Fund's commitment to repurchase, such an
agreement will not be considered a "senior security" by the Fund and therefore
will not be subject to the 300% asset coverage requirement otherwise
applicable to borrowings by the Fund.     
 
  Each Fund is also subject to non-fundamental restrictions and policies
(which may be changed without shareholder approval) relating to the investment
of its assets and activities. As indicated above, certain fundamental
investment restrictions do not apply to certain Funds. However, certain non-
fundamental restrictions, set forth in the Statement of Additional
Information, place comparable limitations on these Funds. See "Investment
Restrictions" in the Statement of Additional Information.
 
 
27  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  Unless otherwise indicated, all limitations applicable to Fund investments
(as stated above and elsewhere in this Prospectus and in the Statement of
Additional Information) apply only at the time a transaction is entered into.
Any subsequent change in a rating assigned by any rating service to a security
(or, if unrated, deemed to be of comparable quality), or change in the
percentage of Fund assets invested in certain securities or other instruments,
or change in the average duration of a Fund's investment portfolio, resulting
from market fluctuations or other changes in a Fund's total assets will not
require a Fund to dispose of an investment until the Adviser determines that
it is practicable to sell or close out the investment without undue market or
tax consequences to the Fund. In the event that ratings services assign
different ratings to the same security, the Adviser will determine which
rating it believes best reflects the security's quality and risk at that time,
which may be the higher of the several assigned ratings.
 
       CHARACTERISTICS AND RISKS OF SECURITIES AND INVESTMENT TECHNIQUES
 
  The following describes in greater detail different types of securities and
investment techniques used by the individual Funds, and discusses certain
concepts relevant to the investment policies of the Funds. Additional
information about the Funds' investments and investment practices may be found
in the Statement of Additional Information.
 
U.S. GOVERNMENT SECURITIES
 
  U.S. Government securities are obligations of, or guaranteed by, the U.S.
Government, its agencies or instrumentalities. The U.S. Government does not
guarantee the net asset value of the Funds' shares. Some U.S. Government
securities, such as Treasury bills, notes and bonds, and securities guaranteed
by the Government National Mortgage Association ("GNMA"), are supported by the
full faith and credit of the United States; others, such as those of the
Federal Home Loan Banks, are supported by the right of the issuer to borrow
from the U.S. Treasury; others, such as those of the Federal National Mortgage
Association ("FNMA"), are supported by the discretionary authority of the U.S.
Government to purchase the agency's obligations; and still others, such as
those of the Student Loan Marketing Association, are supported only by the
credit of the instrumentality. U.S. Government securities include securities
that have no coupons, or have been stripped of their unmatured interest
coupons, individual interest coupons from such securities that trade
separately, and evidences of receipt of such securities. Such securities may
pay no cash income, and are purchased at a deep discount from their value at
maturity. Because interest on zero coupon securities is not distributed on a
current basis but is, in effect, compounded, zero coupon securities tend to be
subject to greater market risk than interest-paying securities of similar
maturities. Custodial receipts issued in connection with so-called trademark
zero coupon securities, such as CATs and TIGRs, are not issued by the U.S.
Treasury, and are therefore not U.S. Government securities, although the
underlying bond represented by such receipt is a debt obligation of the U.S.
Treasury. Other zero coupon Treasury securities (STRIPs and CUBEs) are direct
obligations of the U.S. Government.
 
CORPORATE DEBT SECURITIES
 
  Corporate debt securities include corporate bonds, debentures, notes and
other similar corporate debt instruments, including convertible securities.
Debt securities may be acquired with warrants attached. Corporate income-
producing securities may also include forms of preferred or preference stock.
The rate of interest on a corporate debt security may be fixed, floating or
variable, and may vary inversely with respect to a reference rate. See
"Variable and Floating Rate Securities" below. The rate of return or return of
principal on some debt obligations may be linked or indexed to the level of
exchange rates between the U.S. dollar and a foreign currency or currencies.
 
                                                  August 1, 1998 Prospectus  28
<PAGE>
 
  Investments in corporate debt securities that are rated below investment
grade (rated below Baa (Moody's) or BBB (S&P)) are described as "speculative"
both by Moody's and S&P. Such securities are sometimes referred to as "junk
bonds," and may be subject to greater market fluctuations, less liquidity and
greater risk of loss of income or principal, including a greater possibility
of default or bankruptcy of the issuer of such securities, than are more
highly rated debt securities. Moody's also describes securities rated Baa as
having speculative characteristics. The Adviser seeks to minimize these risks
through diversification, in-depth credit analysis and attention to current
developments in interest rates and market conditions. See "Appendix B--
Description of Securities Ratings." Investments in high yield securities are
discussed separately below under "High Yield Securities ("Junk Bonds")."
 
CONVERTIBLE SECURITIES
 
  Each Fund (except the PIMCO Municipal Bond Fund) may invest in convertible
securities, which may offer higher income than the common stocks into which
they are convertible. Typically, convertible securities are callable by the
company, which may, in effect, force conversion before the holder would
otherwise choose.
 
  The convertible securities in which the Funds may invest consist of bonds,
notes, debentures and preferred stocks which may be converted or exchanged at
a stated or determinable exchange ratio into underlying shares of common
stock. A Fund may be required to permit the issuer of a convertible security
to redeem the security, convert it into the underlying common stock, or sell
it to a third party. Thus, a Fund may not be able to control whether the
issuer of a convertible security chooses to convert that security. If the
issuer chooses to do so, this action could have an adverse effect on a Fund's
ability to achieve its investment objectives.
 
  While the Fixed Income Funds intend to invest primarily in fixed income
securities, each may invest in convertible securities or equity securities.
While some countries or companies may be regarded as favorable investments,
pure fixed income opportunities may be unattractive or limited due to
insufficient supply, legal or technical restrictions. In such cases, a Fund
may consider equity securities or convertible bonds to gain exposure to such
investments.
 
LOAN PARTICIPATIONS AND ASSIGNMENTS
 
  Certain Funds may invest in fixed- and floating-rate loans arranged through
private negotiations between an issuer of debt instruments and one or more
financial institutions ("lenders"). Generally, the Funds' investments in loans
are expected to take the form of loan participations and assignments of
portions of loans from third parties.
 
  Large loans to corporations or governments may be shared or syndicated among
several lenders, usually banks. The Funds may participate in such syndicates,
or can buy part of a loan, becoming a direct lender. Participations and
assignments involve special types of risk, including limited marketability and
the risks of being a lender. See "Illiquid Securities" for a discussion of the
limits on a Fund's investments in loan participations and assignments with
limited marketability. If a Fund purchases a participation, it may only be
able to enforce its rights through the lender, and may assume the credit risk
of the lender in addition to the borrower. In assignments, the Funds' rights
against the borrower may be more limited than those held by the original
lender.
 
DELAYED FUNDING LOANS AND REVOLVING CREDIT FACILITIES
 
  The Funds (except the PIMCO Money Market and Municipal Bond Funds) may also
enter into, or acquire participations in, delayed funding loans and revolving
credit facilities. Delayed funding loans and revolving credit facilities are
borrowing arrangements in which the lender agrees to make loans up to a
maximum amount upon demand by the borrower during a specified term. A
revolving credit facility differs from a delayed funding loan in that as the
 
29  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
borrower repays the loan, an amount equal to the repayment may be borrowed
again during the term of the revolving credit facility. These commitments may
have the effect of requiring a Fund to increase its investment in a company at
a time when it might not otherwise decide to do so (including at a time when
the company's financial condition makes it unlikely that such amounts will be
repaid).
 
  The Funds may acquire a participation interest in delayed funding loans or
revolving credit facilities from a bank or other financial institution. See
"Loan Participations and Assignments." The terms of the participation require
the Fund to make a pro rata share of all loans extended to the borrower and
entitles the Fund to a pro rata share of all payments made by the borrower.
Delayed funding loans and revolving credit facilities usually provide for
floating or variable rates of interest. To the extent that a Fund is committed
to advance additional funds, it will at all times segregate assets, determined
to be liquid by the Adviser in accordance with procedures established by the
Board of Trustees, in an amount sufficient to meet such commitments.
 
VARIABLE AND FLOATING RATE SECURITIES
 
  Variable and floating rate securities provide for a periodic adjustment in
the interest rate paid on the obligations. The terms of such obligations must
provide that interest rates are adjusted periodically based upon an interest
rate adjustment index as provided in the respective obligations. The
adjustment intervals may be regular, and range from daily up to annually, or
may be event based, such as based on a change in the prime rate. The PIMCO
Money Market Fund may invest in a variable rate security having a stated
maturity in excess of 397 calendar days if the interest rate will be adjusted,
and the Fund may demand payment of principal from the issuer, within that
period.
 
  Each of the Fixed Income Funds may invest in floating rate debt instruments
("floaters") and (except the PIMCO Money Market and Municipal Bond Funds)
engage in credit spread trades. The interest rate on a floater is a variable
rate which is tied to another interest rate, such as a money-market index or
Treasury bill rate. The interest rate on a floater resets periodically,
typically every six months. While, because of the interest rate reset feature,
floaters provide a Fund with a certain degree of protection against rises in
interest rates, a Fund will participate in any declines in interest rates as
well. A credit spread trade is an investment position relating to a difference
in the prices or interest rates of two securities or currencies, where the
value of the investment position is determined by movements in the difference
between the prices or interest rates, as the case may be, of the respective
securities or currencies.
   
  Each of the Fixed Income Funds (except the PIMCO Money Market and Municipal
Bond Funds) may also invest in inverse floating rate debt instruments
("inverse floaters"). The interest rate on an inverse floater resets in the
opposite direction from the market rate of interest to which the inverse
floater is indexed. An inverse floating rate security may exhibit greater
price volatility than a fixed rate obligation of similar credit quality. The
Funds have adopted a policy under which no Fund will invest more than 5% (10%
in the case of the PIMCO Low Duration Mortgage and Total Return Mortgage
Funds) of its net assets in any combination of inverse floater, interest only
("IO"), or principal only ("PO") securities. See "Mortgage-Related and Other
Asset-Backed Securities" for a discussion of IOs and POs.     
 
INFLATION-INDEXED BONDS
 
  Inflation-indexed bonds are fixed income securities whose principal value is
periodically adjusted according to the rate of inflation. Such bonds generally
are issued at an interest rate lower than typical bonds, but are expected to
retain their principal value over time. The interest rate on these bonds is
fixed at issuance, but over the life of the bond this interest may be paid on
an increasing principal value, which has been adjusted for inflation.
 
                                                  August 1, 1998 Prospectus  30
<PAGE>
 
  Inflation-indexed securities issued by the U.S. Treasury will initially have
maturities of five or ten years, although it is anticipated that securities
with other maturities will be issued in the future. The securities will pay
interest on a semi-annual basis, equal to a fixed percentage of the inflation-
adjusted principal amount. For example, if a Fund purchased an inflation-
indexed bond with a par value of $1,000 and a 3% real rate of return coupon
(payable 1.5% semi-annually), and inflation over the first six months were 1%,
the mid-year par value of the bond would be $1,010 and the first semi-annual
interest payment would be $15.15 ($1,010 times 1.5%). If inflation during the
second half of the year reached 3%, the end-of-year par value of the bond
would be $1,030 and the second semi-annual interest payment would be $15.45
($1,030 times 1.5%).
 
  If the periodic adjustment rate measuring inflation falls, the principal
value of inflation-indexed bonds will be adjusted downward, and consequently
the interest payable on these securities (calculated with respect to a smaller
principal amount) will be reduced. Repayment of the original bond principal
upon maturity (as adjusted for inflation) is guaranteed in the case of U.S.
Treasury inflation-indexed bonds, even during a period of deflation. However,
the current market value of the bonds is not guaranteed, and will fluctuate.
The Funds may also invest in other inflation related bonds which may or may
not provide a similar guarantee. If a guarantee of principal is not provided,
the adjusted principal value of the bond repaid at maturity may be less than
the original principal.
 
  The value of inflation-indexed bonds is expected to change in response to
changes in real interest rates. Real interest rates in turn are tied to the
relationship between nominal interest rates and the rate of inflation.
Therefore, if inflation were to rise at a faster rate than nominal interest
rates, real interest rates might decline, leading to an increase in value of
inflation-indexed bonds. In contrast, if nominal interest rates increased at a
faster rate than inflation, real interest rates might rise, leading to a
decrease in value of inflation-indexed bonds.
 
  While these securities are expected to be protected from long-term
inflationary trends, short-term increases in inflation may lead to a decline
in value. If interest rates rise due to reasons other than inflation (for
example, due to changes in currency exchange rates), investors in these
securities may not be protected to the extent that the increase is not
reflected in the bond's inflation measure.
 
  The U.S. Treasury has only recently begun issuing inflation-indexed bonds.
As such, there is no trading history of these securities, and there can be no
assurance that a liquid market in these instruments will develop, although one
is expected. Lack of a liquid market may impose the risk of higher transaction
costs and the possibility that a Fund may be forced to liquidate positions
when it would not be advantageous to do so. There also can be no assurance
that the U.S. Treasury will issue any particular amount of inflation-indexed
bonds. Certain foreign governments, such as the United Kingdom, Canada and
Australia, have a longer history of issuing inflation-indexed bonds, and there
may be a more liquid market in certain of these countries for these
securities.
 
  The periodic adjustment of U.S. inflation-indexed bonds is tied to the
Consumer Price Index for Urban Consumers ("CPI-U"), which is calculated
monthly by the U.S. Bureau of Labor Statistics. The CPI-U is a measurement of
changes in the cost of living, made up of components such as housing, food,
transportation and energy. Inflation-indexed bonds issued by a foreign
government are generally adjusted to reflect a comparable inflation index,
calculated by that government. There can be no assurance that the CPI-U or any
foreign inflation index will accurately measure the real rate of inflation in
the prices of goods and services. Moreover, there can be no assurance that the
rate of inflation in a foreign country will be correlated to the rate of
inflation in the United States.
 
31  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  Any increase in the principal amount of an inflation-indexed bond will be
considered taxable ordinary income, even though investors do not receive their
principal until maturity. See "Dividends, Distributions and Taxes" for
information about the possible tax consequences of investing in the PIMCO Real
Return Bond Fund and in inflation-indexed bonds.
 
MORTGAGE-RELATED AND OTHER ASSET-BACKED SECURITIES
   
  Each of the Funds (except the PIMCO Money Market and Municipal Bond Funds)
may invest all of its assets in mortgage- or other asset-backed securities.
The value of some mortgage- or asset-backed securities in which the Funds
invest may be particularly sensitive to changes in prevailing interest rates,
and, like other fixed income investments, the ability of a Fund to
successfully utilize these instruments may depend in part upon the ability of
the Adviser to forecast interest rates and other economic factors correctly.
    
  Mortgage Pass-Through Securities are securities representing interests in
"pools" of mortgage loans secured by residential or commercial real property
in which payments of both interest and principal on the securities are
generally made monthly, in effect "passing through" monthly payments made by
the individual borrowers on the mortgage loans which underlie the securities
(net of fees paid to the issuer or guarantor of the securities). Early
repayment of principal on some mortgage-related securities (arising from
prepayments of principal due to sale of the underlying property, refinancing,
or foreclosure, net of fees and costs which may be incurred) may expose a Fund
to a lower rate of return upon reinvestment of principal. Also, if a security
subject to prepayment has been purchased at a premium, the value of the
premium would be lost in the event of prepayment. Like other fixed income
securities, when interest rates rise, the value of a mortgage-related security
generally will decline; however, when interest rates are declining, the value
of mortgage-related securities with prepayment features may not increase as
much as other fixed income securities. The rate of prepayments on underlying
mortgages will affect the price and volatility of a mortgage-related security,
and may have the effect of shortening or extending the effective maturity of
the security beyond what was anticipated at the time of purchase. To the
extent that unanticipated rates of prepayment on underlying mortgages increase
the effective maturity of a mortgage-related security, the volatility of such
security can be expected to increase.
 
  Payment of principal and interest on some mortgage pass-through securities
(but not the market value of the securities themselves) may be guaranteed by
the full faith and credit of the U.S. Government (in the case of securities
guaranteed by GNMA); or guaranteed by agencies or instrumentalities of the
U.S. Government (in the case of securities guaranteed by FNMA or the Federal
Home Loan Mortgage Corporation ("FHLMC"), which are supported only by the
discretionary authority of the U.S. Government to purchase the agency's
obligations). Mortgage-related securities created by non-governmental issuers
(such as commercial banks, savings and loan institutions, private mortgage
insurance companies, mortgage bankers and other secondary market issuers) may
be supported by various forms of insurance or guarantees, including individual
loan, title, pool and hazard insurance and letters of credit, which may be
issued by governmental entities, private insurers or the mortgage poolers.
 
  Collateralized Mortgage Obligations ("CMOs") are hybrid mortgage-related
instruments. Interest and pre-paid principal on a CMO are paid, in most cases,
on a monthly basis. CMOs may be collateralized by whole mortgage loans but are
more typically collateralized by portfolios of mortgage pass-through
securities guaranteed by GNMA, FHLMC, or FNMA. CMOs are structured into
multiple classes, with each class bearing a different stated maturity. Monthly
payments of principal, including prepayments, are first returned to investors
holding the shortest maturity class; investors holding the longer maturity
classes receive principal only after the first class has been retired. CMOs
that are issued or guaranteed by the U.S. Government or by any of its agencies
or instrumentalities will be considered U.S. Government securities by the
Funds, while other CMOs, even if collateralized by U.S. Government securities,
will have the same status as other privately issued securities for purposes of
applying a Fund's diversification tests.
 
                                                  August 1, 1998 Prospectus  32
<PAGE>
 
  Commercial Mortgage-Backed Securities include securities that reflect an
interest in, and are secured by, mortgage loans on commercial real property.
The market for commercial mortgage-backed securities developed more recently
and in terms of total outstanding principal amount of issues is relatively
small compared to the market for residential single-family mortgage-backed
securities. Many of the risks of investing in commercial mortgage-backed
securities reflect the risks of investing in the real estate securing the
underlying mortgage loans. These risks reflect the effects of local and other
economic conditions on real estate markets, the ability of tenants to make
loan payments, and the ability of a property to attract and retain tenants.
Commercial mortgage-backed securities may be less liquid and exhibit greater
price volatility than other types of mortgage-related or asset-backed
securities.
 
  Mortgage-Related Securities include securities other than those described
above that directly or indirectly represent a participation in, or are secured
by and payable from, mortgage loans on real property, such as mortgage dollar
rolls (see "Reverse Repurchase Agreements, Dollar Rolls, and Borrowings"), CMO
residuals or stripped mortgage-backed securities ("SMBS"), and may be
structured in classes with rights to receive varying proportions of principal
and interest.
 
  A common type of SMBS will have one class receiving some of the interest and
most of the principal from the mortgage assets, while the other class will
receive most of the interest and the remainder of the principal. In the most
extreme case, one class will receive all of the interest (the interest-only,
or "IO" class), while the other class will receive all of the principal (the
principal-only, or "PO" class). The yield to maturity on an IO class is
extremely sensitive to the rate of principal payments (including prepayments)
on the related underlying mortgage assets, and a rapid rate of principal
payments may have a material adverse effect on a Fund's yield to maturity from
these securities. The Funds have adopted a policy under which no Fund will
invest more than 5% (10% in the case of the PIMCO Low Duration Mortgage and
Total Return Mortgage Funds) of its net assets in any combination of IO, PO,
or inverse floater securities. The Funds may invest in other asset-backed
securities that have been offered to investors. For a discussion of the
characteristics of some of these instruments, see the Statement of Additional
Information.
 
MUNICIPAL BONDS
 
  The PIMCO Municipal Bond Fund invests in Municipal Bonds which are generally
issued by states and local governments and their agencies, authorities and
other instrumentalities. The Municipal Bonds which the PIMCO Municipal Bond
Fund may purchase include general obligation bonds and limited obligation
bonds (or revenue bonds), including industrial development bonds issued
pursuant to former federal tax law. General obligation bonds are obligations
involving the credit of an issuer possessing taxing power and are payable from
such issuer's general revenues and not from any particular source. Limited
obligation bonds are payable only from the revenues derived from a particular
facility or class of facilities or, in some cases, from the proceeds of a
special excise or other specific revenue source. Tax-exempt "private activity"
bonds and industrial development bonds generally are also revenue bonds and
thus are not payable from the issuer's general revenues. The PIMCO Municipal
Bond Fund may invest in Municipal Bonds with credit enhancements such as
letters of credit, municipal bond insurance and Standby Bond Purchase
Agreements. The PIMCO Municipal Bond Fund may also invest in municipal lease
obligations, as well as securities derived from Municipal Bonds, such as
residual interest bonds and participation interests.
 
  Municipal Bonds are subject to credit and market risk. Credit risk relates
to the ability of the issuer to make payments of principal and interest. The
ability of an issuer to make such payments could be affected by litigation,
legislation or other political events or the bankruptcy of the issuer. Market
risk relates to changes in a security's value as a result of changes in
interest rates. Lower rated Municipal Bonds generally provide higher yields
but are subject to greater credit and market risk than higher quality
Municipal Bonds.
 
33  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
REPURCHASE AGREEMENTS
 
  For the purpose of achieving income, each of the Funds may enter into
repurchase agreements, which entail the purchase of a portfolio-eligible
security from a bank or broker-dealer that agrees to repurchase the security
at the Fund's cost plus interest within a specified time (normally one day).
If the party agreeing to repurchase should default, as a result of bankruptcy
or otherwise, the Fund will seek to sell the securities which it holds, which
action could involve procedural costs or delays in addition to a loss on the
securities if their value should fall below their repurchase price. No Fund
will invest more than 15% of its net assets (10% in the case of the PIMCO
Money Market Fund) (taken at current market value) in repurchase agreements
maturing in more than seven days.
 
REVERSE REPURCHASE AGREEMENTS, DOLLAR ROLLS, AND BORROWINGS
   
  A reverse repurchase agreement involves the sale of a security by a Fund and
its agreement to repurchase the instrument at a specified time and price.
Under a reverse repurchase agreement, the Fund continues to receive any
principal and interest payments on the underlying security during the term of
the agreement. The Fund generally will segregate assets determined to be
liquid by the Adviser in accordance with procedures established by the Board
of Trustees to cover its obligations under reverse repurchase agreements and,
to this extent, a reverse repurchase agreement (or economically similar
transaction) will not be considered a "senior security" subject to the 300%
asset coverage requirements otherwise applicable to borrowings by a Fund.     
   
  A Fund may enter into dollar rolls, in which the Fund sells mortgage-backed
or other securities for delivery in the current month and simultaneously
contracts to purchase substantially similar securities on a specified future
date. In the case of dollar rolls involving mortgage-backed securities, the
mortgage-backed securities that are purchased will be of the same type and
will have the same interest rate as those sold, but will be supported by
different pools of mortgages. The Fund forgoes principal and interest paid
during the roll period on the securities sold in a dollar roll, but the Fund
is compensated by the difference between the current sales price and the lower
price for the future purchase as well as by any interest earned on the
proceeds of the securities sold. The Fund also could be compensated through
the receipt of fee income equivalent to a lower forward price. The Fund will
segregate assets determined to be liquid by the Adviser in accordance with
procedures established by the Board of Trustees, to cover its obligations
under dollar rolls.     
   
  To the extent that positions in reverse repurchase agreements, dollar rolls
or similar transactions are not covered through the maintenance of segregated
liquid assets at least equal to the amount of any forward purchase commitment,
such transactions would be subject to the Funds' limitations on borrowings,
which would restrict the aggregate of such transactions (plus any other
borrowings) to 33 1/3% (for each Fund except the PIMCO Global Bond Fund II) of
a Fund's total assets. Apart from such transactions, a Fund will not borrow
money, except for temporary administrative purposes. The PIMCO Global Bond
Fund II may not borrow in excess of 10% of the value of its total assets and
then only from banks as a temporary measure to facilitate the meeting of
redemption requests (not for leverage) or for extraordinary or emergency
purposes.     
 
LOANS OF PORTFOLIO SECURITIES
 
  For the purpose of achieving income, the Funds may lend their portfolio
securities to brokers, dealers, and other financial institutions, provided:
  (i)   the loan is secured continuously by collateral consisting of U.S.
        Government securities, cash or cash equivalents (negotiable
        certificates of deposit, bankers' acceptances or letters of credit)
        maintained on a daily mark-to-market basis in an amount at least equal
        to the current market value of the securities loaned;
  (ii)  the Fund may at any time call the loan and obtain the return of the
        securities loaned;
 
                                                  August 1, 1998 Prospectus  34
<PAGE>
 
  (iii)  the Fund will receive any interest or dividends paid on the loaned
         securities; and
  (iv)  the aggregate market value of securities loaned will not at any time
        exceed 33 1/3% (25% in the case of the PIMCO Global Bond Fund II) of
        the total assets of the Fund.
 
  Each Fund's performance will continue to reflect changes in the value of the
securities loaned and will also reflect the receipt of either interest through
investment of cash collateral by the Fund in permissible investments, or a
fee, if the collateral is U.S. Government securities. Securities lending
involves the risk of loss of rights in the collateral or delay in recovery of
the collateral should the borrower fail to return the securities loaned or
become insolvent. The Funds may pay lending fees to the party arranging the
loan.
 
WHEN-ISSUED, DELAYED DELIVERY, AND FORWARD COMMITMENT TRANSACTIONS
   
  Each of the Funds may purchase or sell securities on a when-issued, delayed
delivery, or forward commitment basis. These transactions involve a commitment
by the Fund to purchase or sell securities for a predetermined price or yield,
with payment and delivery taking place more than seven days in the future, or
after a period longer than the customary settlement period for that type of
security. When such purchases are outstanding, the Fund will segregate until
the settlement date assets determined to be liquid by the Adviser in
accordance with procedures established by the Board of Trustees, in an amount
sufficient to meet the purchase price. Typically, no income accrues on
securities a Fund has committed to purchase prior to the time delivery of the
securities is made, although a Fund may earn income on securities it has
segregated.     
   
  When purchasing a security on a when-issued, delayed delivery, or forward
commitment basis, the Fund assumes the rights and risks of ownership of the
security, including the risk of price and yield fluctuations, and takes such
fluctuations into account when determining its net asset value. Because the
Fund is not required to pay for the security until the delivery date, these
risks are in addition to the risks associated with the Fund's other
investments. If the Fund remains substantially fully invested at a time when
when-issued, delayed delivery, or forward commitment purchases are
outstanding, the purchases may result in a form of leverage.     
   
  When the Fund has sold a security on a when-issued, delayed delivery, or
forward commitment basis, the Fund does not participate in future gains or
losses with respect to the security. If the other party to a transaction fails
to deliver or pay for the securities, the Fund could miss a favorable price or
yield opportunity or could suffer a loss. A Fund may dispose of or renegotiate
a transaction after it is entered into, and may sell when-issued, delayed
delivery or forward commitment securities before they are delivered, which may
result in a capital gain or loss. There is no percentage limitation on the
extent to which the Funds may purchase or sell securities on a when-issued,
delayed delivery, or forward commitment basis.     
 
SHORT SALES
   
  Each of the Funds (except the PIMCO Total Return III, High Yield and
StocksPLUS Funds), and particularly the PIMCO StocksPLUS Short Strategy Fund,
may from time to time effect short sales as part of their overall portfolio
management strategies, including the use of derivative instruments, or to
offset potential declines in value of long positions in similar securities as
those sold short. A short sale (other than a short sale against the box) is a
transaction in which a Fund sells a security it does not own at the time of
the sale in anticipation that the market price of that security will decline.
To the extent that a Fund engages in short sales, it must (except in the case
of short sales "against the box") maintain asset coverage in the form of
segregated assets determined to be liquid by the Adviser in accordance with
procedures established by the Board of Trustees or otherwise cover its
position in a permissible manner. A short     
 
35  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
sale is "against the box" to the extent that the Fund contemporaneously owns,
or has the right to obtain at no added cost, securities identical to those
sold short. The PIMCO Global Bond Fund II may only engage in short sales that
are "against the box."
 
FOREIGN SECURITIES
 
  Each of the Funds (except the PIMCO Low Duration II, Total Return II, Long-
Term U.S. Government and Municipal Bond Funds) may invest directly in fixed
income securities of non-U.S. issuers. The PIMCO Money Market, Low Duration
Mortgage, Total Return Mortgage, Commercial Mortgage Securities and High Yield
Funds may only invest in U.S. dollar-denominated fixed income securities of
non-U.S. issuers. Each of the Stock Funds may invest directly in foreign
equity securities.
   
  Except for the PIMCO Emerging Markets Bond and Emerging Markets Bond II
Funds, each of the Funds will concentrate its foreign investments in
securities of issuers based in developed countries. However, the PIMCO Short-
Term, Low Duration and Low Duration III Funds may each invest up to 5% of its
assets in securities of issuers based in the emerging market countries in
which the PIMCO Emerging Markets Bond and Emerging Markets Bond II Funds may
invest, and each of the remaining Fixed Income Funds that may invest in
foreign securities may invest up to 10% of its assets in such securities.     
 
  Individual foreign economies may differ favorably or unfavorably from the
U.S. economy in such respects as growth of gross domestic product, rate of
inflation, capital reinvestment, resources, self-sufficiency and balance of
payments position. The securities markets, values of securities, yields and
risks associated with securities markets in different countries may change
independently of each other. Investing in the securities of issuers in any
foreign country involves special risks and considerations not typically
associated with investing in U.S. companies. Shareholders should consider
carefully the substantial risks involved in investing in securities issued by
companies and governments of foreign nations. These risks include: differences
in accounting, auditing and financial reporting standards; generally higher
commission rates on foreign portfolio transactions; the possibility of
nationalization, expropriation or confiscatory taxation; adverse changes in
investment or exchange control regulations (which may include suspension of
the ability to transfer currency from a country); and political instability
which could affect U.S. investments in foreign countries. Additionally,
foreign securities and dividends and interest payable on those securities may
be subject to foreign taxes, including taxes withheld from payments on those
securities. Foreign securities often trade with less frequency and volume than
domestic securities and therefore may exhibit greater price volatility.
Additional costs associated with an investment in foreign securities may
include higher custodial fees than apply to domestic custodial arrangements
and transaction costs of foreign currency conversions. Changes in foreign
exchange rates also will affect the value of securities denominated or quoted
in currencies other than the U.S. dollar.
   
  Certain of the Funds, and particularly the PIMCO Emerging Markets Bond and
Emerging Markets Bond II Funds, may invest in the securities of issuers based
in countries with developing economies. Investing in developing (or "emerging
market") countries involves certain risks not typically associated with
investing in U.S. securities, and imposes risks greater than, or in addition
to, risks of investing in foreign, developed countries. A number of emerging
market countries restrict, to varying degrees, foreign investment in
securities. Repatriation of investment income, capital, and the proceeds of
sales by foreign investors may require governmental registration and/or
approval in some emerging market countries. A number of the currencies of
emerging market countries have experienced significant declines against the
U.S. dollar in recent years, and devaluation may occur subsequent to
investments in these currencies by a Fund. Inflation and rapid fluctuations in
inflation rates have had, and may continue to have, negative effects on the
economies and     
 
                                                  August 1, 1998 Prospectus  36
<PAGE>
 
securities markets of certain emerging market countries. Many of the emerging
securities markets are relatively small, have low trading volumes, suffer
periods of relative illiquidity, and are characterized by significant price
volatility. There is a risk in emerging market countries that a future
economic or political crisis could lead to price controls, forced mergers of
companies, expropriation or confiscatory taxation, seizure, nationalization,
or creation of government monopolies, any of which may have a detrimental
effect on a Fund's investment.
 
  Additional risks of investing in emerging market countries may include:
currency exchange rate fluctuations; greater social, economic and political
uncertainty and instability (including the risk of war); more substantial
governmental involvement in the economy; less governmental supervision and
regulation of the securities markets and participants in those markets;
unavailability of currency hedging techniques in certain emerging market
countries; the fact that companies in emerging market countries may be newly
organized and may be smaller and less seasoned companies; the difference in,
or lack of, auditing and financial reporting standards, which may result in
unavailability of material information about issuers; the risk that it may be
more difficult to obtain and/or enforce a judgment in a court outside the
United States; and significantly smaller market capitalization of securities
markets. Also, any change in the leadership or policies of Eastern European
countries, or the countries that exercise a significant influence over those
countries, may halt the expansion of or reverse the liberalization of foreign
investment policies now occurring and adversely affect existing investment
opportunities.
 
  In addition, emerging securities markets may have different clearance and
settlement procedures, which may be unable to keep pace with the volume of
securities transactions or otherwise make it difficult to engage in such
transactions. Settlement problems may cause a Fund to miss attractive
investment opportunities, hold a portion of its assets in cash pending
investment, or delay in disposing of a portfolio security. Such a delay could
result in possible liability to a purchaser of the security.
 
  Each of the Fixed Income Funds (except the PIMCO Low Duration II, Total
Return II, Long-Term U.S. Government and Municipal Bond Funds) may invest in
Brady Bonds. Brady Bonds are securities created through the exchange of
existing commercial bank loans to sovereign entities for new obligations in
connection with debt restructurings under a debt restructuring plan introduced
by former U.S. Secretary of the Treasury, Nicholas F. Brady. Brady Bonds have
been issued only recently, and for that reason do not have a long payment
history. Brady Bonds may be collateralized or uncollateralized, are issued in
various currencies (but primarily the U.S. dollar), and are actively traded in
the over-the-counter secondary market. Brady Bonds are not considered to be
U.S. Government securities. In light of the residual risk of Brady Bonds and,
among other factors, the history of defaults with respect to commercial bank
loans by public and private entities in countries issuing Brady Bonds,
investments in Brady Bonds may be viewed as speculative. There can be no
assurance that Brady Bonds acquired by a Fund will not be subject to
restructuring arrangements or to requests for new credit, which may cause the
Fund to suffer a loss of interest or principal on any of its holdings. For
further information, see the Statement of Additional Information.
 
  Certain of the Funds also may invest in sovereign debt (other than Brady
Bonds) issued by governments, their agencies or instrumentalities, or other
government-related entities located in emerging market countries. Holders of
sovereign debt may be requested to particpate in the rescheduling of such debt
and to extend further loans to governmental entities. In addition, there is no
bankruptcy proceeding by which defaulted sovereign debt may be collected.
 
  A Fund's investments in foreign currency denominated debt obligations and
hedging activities will likely produce a difference between its book income
and its taxable income. This difference may cause a portion of the Fund's
income
 
37  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
distributions to constitute returns of capital for tax purposes or require the
Fund to make distributions exceeding book income to qualify as a regulated
investment company for federal tax purposes.
 
FOREIGN CURRENCY TRANSACTIONS
 
  Foreign currency exchange rates may fluctuate significantly over short
periods of time. They generally are determined by the forces of supply and
demand in the foreign exchange markets and the relative merits of investments
in different countries, actual or perceived changes in interest rates and
other complex factors, as seen from an international perspective. Currency
exchange rates also can be affected unpredictably by intervention (or the
failure to intervene) by U.S. or foreign governments or central banks, by
currency controls or political developments in the U.S. or abroad. For
example, significant uncertainty surrounds the proposed introduction of the
euro (a common currency for the European Union) in January 1999 and its effect
on the value of securities denominated in local European currencies. These and
other currencies in which the Funds' assets are denominated may be devalued
against the U.S. dollar, resulting in a loss to the Funds.
   
  All Funds that may invest in securities denominated in foreign currencies
may buy and sell foreign currencies on a spot and forward basis to reduce the
risks of adverse changes in foreign exchange rates. A forward foreign currency
exchange contract involves an obligation to purchase or sell a specific
currency at a future date, which may be any fixed number of days from the date
of the contract agreed upon by the parties, at a price set at the time of the
contract. By entering into a forward foreign currency exchange contract, the
Fund "locks in" the exchange rate between the currency it will deliver and the
currency it will receive for the duration of the contract. As a result, a Fund
reduces its exposure to changes in the value of the currency it will deliver
and increases its exposure to changes in the value of the currency it will
exchange into. The effect on the value of a Fund is similar to selling
securities denominated in one currency and purchasing securities denominated
in another. Contracts to sell foreign currency would limit any potential gain
which might be realized by a Fund if the value of the hedged currency
increases. A Fund may enter into these contracts for the purpose of hedging
against foreign exchange risk arising from the Fund's investment or
anticipated investment in securities denominated in foreign currencies. A Fund
also may enter into these contracts for purposes of increasing exposure to a
foreign currency or to shift exposure to foreign currency fluctuations from
one country to another. A Fund may use one currency (or a basket of
currencies) to hedge against adverse changes in the value of another currency
(or a basket of currencies) when exchange rates between the two currencies are
positively correlated. Each Fund will segregate assets determined to be liquid
by the Adviser in accordance with procedures established by the Board of
Trustees, to cover its obligations under forward foreign currency exchange
contracts entered into for non-hedging purposes.     
 
  All Funds that may invest in securities denominated in foreign currencies
may invest in options on foreign currencies and foreign currency futures and
options thereon. The Funds also may invest in foreign currency exchange-
related securities, such as foreign currency warrants and other instruments
whose return is linked to foreign currency exchange rates. Each Fund that may
invest in securities denominated in foreign currencies, except the PIMCO
Global Bond, Emerging Markets Bond and Emerging Markets Bond II Funds, will
use these techniques to hedge at least 75% of its exposure to foreign
currency. For a description of these instruments, see "Derivative Instruments"
below and the Statement of Additional Information.
 
HIGH YIELD SECURITIES ("JUNK BONDS")
 
  The PIMCO High Yield Fund invests at least 65% of its assets, the PIMCO
Emerging Markets Bond Fund may invest up to 100% of its assets, and the PIMCO
Commercial Mortgage Securities Fund may invest up to 35% of its assets, in
fixed income securities rated lower than Baa by Moody's or lower than BBB by
S&P but rated at least B by Moody's or S&P
 
                                                  August 1, 1998 Prospectus  38
<PAGE>
 
   
(or, if not rated, determined by the Adviser to be of comparable quality). In
addition, each of the PIMCO Short-Term, Low Duration, Low Duration III,
Moderate Duration, Real Return Bond, Total Return, Total Return III, Global
Bond, Global Bond II, Foreign Bond, Strategic Balanced, StocksPLUS and
StocksPLUS Short Strategy Funds may invest up to 10% of its assets in such
securities. The Emerging Markets Bond Fund II may invest up to 10% of its
assets in securities rated B by Moody's or S&P and may invest up to 100% of
its assets in securities rated Ba by Moody's or BB by S&P (or, if not rated,
determined by the Adviser to be of comparable quality). The Municipal Bond
Fund may invest up to 10% of its assets in securities rated lower than Baa by
Moody's or BBB by S&P but rated at least Ba by Moody's or BB by S&P.
Securities rated lower than Baa by Moody's or lower than BBB by S&P are
sometimes referred to as "high yield" or "junk" bonds. Securities rated Baa
are considered by Moody's to have some speculative characteristics. Investors
should consider the following risks associated with high yield securities
before investing in these Funds.     
 
  Investing in high yield securities involves special risks in addition to the
risks associated with investments in higher rated fixed income securities.
High yield securities may be regarded as predominately speculative with
respect to the issuer's continuing ability to meet principal and interest
payments. Analysis of the creditworthiness of issuers of high yield securities
may be more complex than for issuers of higher quality debt securities, and
the ability of a Fund to achieve its investment objective may, to the extent
of its investments in high yield securities, be more dependent upon such
creditworthiness analysis than would be the case if the Fund were investing in
higher quality securities.
 
  High yield securities may be more susceptible to real or perceived adverse
economic and competitive industry conditions than higher grade securities. The
prices of high yield securities have been found to be less sensitive to
interest rate changes than more highly rated investments, but more sensitive
to adverse economic downturns or individual corporate developments. A
projection of an economic downturn or of a period of rising interest rates,
for example, could cause a decline in high yield security prices because the
advent of a recession could lessen the ability of a highly leveraged company
to make principal and interest payments on its debt securities. If the issuer
of high yield securities defaults, a Fund may incur additional expenses to
seek recovery. In the case of high yield securities structured as zero coupon
or payment-in-kind securities, the market prices of such securities are
affected to a greater extent by interest rate changes, and therefore tend to
be more volatile than securities which pay interest periodically and in cash.
 
  The secondary markets on which high yield securities are traded may be less
liquid than the market for higher grade securities. Less liquidity in the
secondary trading markets could adversely affect and cause large fluctuations
in the daily net asset value of a Fund's shares. Adverse publicity and
investor perceptions, whether or not based on fundamental analysis, may
decrease the values and liquidity of high yield securities, especially in a
thinly traded market.
 
  The use of credit ratings as the sole method of evaluating high yield
securities can involve certain risks. For example, credit ratings evaluate the
safety of principal and interest payments, not the market value risk of high
yield securities. Also, credit rating agencies may fail to change credit
ratings in a timely fashion to reflect events since the security was last
rated. The Adviser does not rely solely on credit ratings when selecting
securities for the Funds, and develops its own independent analysis of issuer
credit quality. If a credit rating agency changes the rating of a portfolio
security held by a Fund, the Fund may retain the portfolio security if the
Adviser deems it in the best interest of shareholders.
 
39  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
  During the year ended March 31, 1998, based upon the dollar-weighted average
ratings of the Funds' portfolio holdings at the end of each month in the
Funds' fiscal year, each operational Fund that may invest greater than 5% of
its assets in securities rated below investment grade had the following
percentages of its net assets invested in securities rated in the categories
indicated as rated by Moody's (or, if unrated, determined by the Adviser to be
of comparable quality). See "Appendix B--Description of Securities Ratings,"
for further information.     
 
<TABLE>   
<CAPTION>
                                       RATING
                       --------------------------------------------
                                               BELOW
FUND                   PRIME 1 AAA  AA    A   PRIME 1 BAA  BA    B
- ----                   ------- ---  ---  ---  ------- ---  ---  ---
<S>                    <C>     <C>  <C>  <C>  <C>     <C>  <C>  <C>
Short-Term                17%   35%   2%  15%    16%    9%   6%   0%
Low Duration               6    75    1    1      5     7    5    0
Low Duration III          40    54    0    4      0     2    0    0
Moderate Duration         23    45    2    8      6     9    7    0
Total Return              20    47    0   13      6     8    6    0
Total Return III          16    44    1   17      9     8    5    0
High Yield                 5     2    0    0      2     6   43   42
Global Bond               34    44    4   10      1     3    4    0
Global Bond II            65    21    3    6      0     2    3    0
Foreign Bond              54    31    4    2      1     2    6    0
Emerging Markets Bond     16    14    0    0      0    18   47    5
Strategic Balanced        17    58    1    9      4     2    9    0
StocksPLUS                26    38    1   10     11     7    7    0
</TABLE>    
 
  These figures are intended solely to provide disclosure about each Fund's
asset composition during its most recent fiscal year. The asset composition
after this time may or may not be approximately the same as represented by
such figures. In addition, the categories reflect ratings by Moody's, and
ratings assigned by  S&P may not be consistent with ratings assigned by
Moody's or other credit ratings services, and the Adviser may not necessarily
agree with a rating assigned by any credit rating agency.
 
DERIVATIVE INSTRUMENTS
   
  To the extent permitted by the investment objectives and policies of the
Funds, the Funds may (except the PIMCO Money Market Fund) purchase and write
call and put options on securities, securities indexes and foreign currencies,
and enter into futures contracts and use options on futures contracts as
further described below. The Funds (except the PIMCO Money Market and
Municipal Bond Funds) also may enter into swap agreements with respect to
foreign currencies, interest rates, and securities indexes. The Funds may use
these techniques to hedge against changes in interest rates, foreign currency
exchange rates or securities prices or as part of their overall investment
strategies. The Funds (except the PIMCO Money Market and Municipal Bond Funds)
may also purchase and sell options relating to foreign currencies for purposes
of increasing exposure to a foreign currency or to shift exposure to foreign
currency fluctuations from one country to another. Each Fund will segregate
assets determined to be liquid by the Adviser in accordance with procedures
established by the Board of Trustees (or, as permitted by applicable
regulation, enter into certain offsetting positions) to cover its obligations
under options, futures, and swaps to limit leveraging of the Fund.     
   
  Derivative instruments are considered for these purposes to consist of
securities or other instruments whose value is derived from or related to the
value of some other instrument or asset, and not to include those securities
whose payment of principal and/or interest depends upon cash flows from
underlying assets, such as mortgage-related or asset-backed securities. Each
Fund (except the PIMCO Money Market and Municipal Bond Funds) may invest all
of its assets in derivative instruments, subject only to the Fund's investment
objective and policies. The value of some     
 
                                                  August 1, 1998 Prospectus  40
<PAGE>
 
derivative instruments in which the Funds invest may be particularly sensitive
to changes in prevailing interest rates, and, like the other investments of
the Funds, the ability of a Fund to successfully utilize these instruments may
depend in part upon the ability of the Adviser to forecast interest rates and
other economic factors correctly. If the Adviser incorrectly forecasts such
factors and has taken positions in derivative instruments contrary to
prevailing market trends, the Funds could be exposed to the risk of loss.
 
  The Funds might not employ any of the strategies described below, and no
assurance can be given that any strategy used will succeed. If the Adviser
incorrectly forecasts interest rates, market values or other economic factors
in utilizing a derivatives strategy for a Fund, the Fund might have been in a
better position if it had not entered into the transaction at all. The use of
these strategies involves certain special risks, including a possible
imperfect correlation, or even no correlation, between price movements of
derivative instruments and price movements of related investments. While some
strategies involving derivative instruments can reduce the risk of loss, they
can also reduce the opportunity for gain or even result in losses by
offsetting favorable price movements in related investments or otherwise, due
to the possible inability of a Fund to purchase or sell a portfolio security
at a time that otherwise would be favorable or the possible need to sell a
portfolio security at a disadvantageous time because the Fund is required to
maintain asset coverage or offsetting positions in connection with
transactions in derivative instruments, and the possible inability of a Fund
to close out or to liquidate its derivatives positions.
 
  Options on Securities, Securities Indexes, and Currencies A Fund may
purchase put options on securities and indexes. One purpose of purchasing put
options is to protect holdings in an underlying or related security against a
substantial decline in market value. A Fund may also purchase call options on
securities and indexes. One purpose of purchasing call options is to protect
against substantial increases in prices of securities the Fund intends to
purchase pending its ability to invest in such securities in an orderly
manner. An option on a security (or index) is a contract that gives the holder
of the option, in return for a premium, the right to buy from (in the case of
a call) or sell to (in the case of a put) the writer of the option the
security underlying the option (or the cash value of the index) at a specified
exercise price at any time during the term of the option. The writer of an
option on a security has the obligation upon exercise of the option to deliver
the underlying security upon payment of the exercise price or to pay the
exercise price upon delivery of the underlying security. Upon exercise, the
writer of an option on an index is obligated to pay the difference between the
cash value of the index and the exercise price multiplied by the specified
multiplier for the index option. An index is designed to reflect specified
facets of a particular financial or securities market, a specific group of
financial instruments or securities, or certain economic indicators.
 
  A Fund may sell put or call options it has previously purchased, which could
result in a net gain or loss depending on whether the amount realized on the
sale is more or less than the premium and other transaction costs paid on the
put or call option which is sold. A Fund may write a call or put option only
if the option is "covered" by the Fund holding a position in the underlying
securities or by other means which would permit immediate satisfaction of the
Fund's obligation as writer of the option. Prior to exercise or expiration, an
option may be closed out by an offsetting purchase or sale of an option of the
same series.
 
  The Funds may write covered straddles consisting of a combination of a call
and a put written on the same underlying security. A straddle will be covered
when sufficient assets are deposited to meet the Funds' immediate obligations.
The Funds may use the same liquid assets to cover both the call and put
options where the exercise price of the call and put are the same, or the
exercise price of the call is higher than that of the put. In such cases, the
Funds will also segregate liquid assets equivalent to the amount, if any, by
which the put is "in the money."
 
41  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  The purchase and writing of options involves certain risks. During the
option period, the covered call writer has, in return for the premium on the
option, given up the opportunity to profit from a price increase in the
underlying security above the exercise price, but, as long as its obligation
as a writer continues, has retained the risk of loss should the price of the
underlying security decline. The writer of an option has no control over the
time when it may be required to fulfill its obligation as a writer of the
option. Once an option writer has received an exercise notice, it cannot
effect a closing purchase transaction in order to terminate its obligation
under the option and must deliver the underlying security at the exercise
price. If a put or call option purchased by the Fund is not sold when it has
remaining value, and if the market price of the underlying security remains
equal to or greater than the exercise price (in the case of a put), or remains
less than or equal to the exercise price (in the case of a call), the Fund
will lose its entire investment in the option. Also, where a put or call
option on a particular security is purchased to hedge against price movements
in a related security, the price of the put or call option may move more or
less than the price of the related security. There can be no assurance that a
liquid market will exist when a Fund seeks to close out an option position.
Furthermore, if trading restrictions or suspensions are imposed on the options
markets, a Fund may be unable to close out a position.
 
  Funds that invest in foreign currency-denominated securities may buy or sell
put and call options on foreign currencies. Currency options traded on U.S. or
other exchanges may be subject to position limits which may limit the ability
of a Fund to reduce foreign currency risk using such options.
 
  Over-the-counter options in which certain Funds may invest differ from
traded options in that they are two-party contracts, with price and other
terms negotiated between buyer and seller, and generally do not have as much
market liquidity as exchange-traded options. The Funds may be required to
treat as illiquid over-the-counter options purchased and securities being used
to cover certain written over-the-counter options.
 
  Swap Agreements The Funds (except the PIMCO Money Market and Municipal Bond
Funds) may enter into interest rate, index, equity and currency exchange rate
swap agreements. These transactions would be entered into in an attempt to
obtain a particular return when it is considered desirable to do so, possibly
at a lower cost to the Fund than if the Fund had invested directly in the
asset that yielded the desired return. Swap agreements are two-party contracts
entered into primarily by institutional investors for periods ranging from a
few weeks to more than one year. In a standard swap transaction, two parties
agree to exchange the returns (or differentials in rates of return) earned or
realized on particular predetermined investments or instruments, which may be
adjusted for an interest factor. The gross returns to be exchanged or
"swapped" between the parties are generally calculated with respect to a
"notional amount," i.e., the return on or increase in value of a particular
dollar amount invested at a particular interest rate, in a particular foreign
currency, or in a "basket" of securities representing a particular index.
Forms of swap agreements include interest rate caps, under which, in return
for a premium, one party agrees to make payments to the other to the extent
that interest rates exceed a specified rate, or "cap"; interest rate floors,
under which, in return for a premium, one party agrees to make payments to the
other to the extent that interest rates fall below a specified level, or
"floor"; and interest rate collars, under which a party sells a cap and
purchases a floor or vice versa in an attempt to protect itself against
interest rate movements exceeding given minimum or maximum levels.
   
  Most swap agreements entered into by the Funds calculate the obligations of
the parties to the agreement on a "net basis." Consequently, a Fund's current
obligations (or rights) under a swap agreement will generally be equal only to
the net amount to be paid or received under the agreement based on the
relative values of the positions held by each party to the agreement (the "net
amount"). A Fund's current obligations under a swap agreement will be accrued
daily (offset against amounts owed to the Fund), and any accrued but unpaid
net amounts owed to a swap counterparty will be covered by the segregation of
assets determined to be liquid by the Adviser in accordance with procedures
established by     
 
                                                  August 1, 1998 Prospectus  42
<PAGE>
 
the Board of Trustees, to limit any potential leveraging of the Fund's
portfolio. Obligations under swap agreements so covered will not be construed
to be "senior securities" for purposes of the Funds' investment restriction
concerning senior securities. A Fund will not enter into a swap agreement with
any single party if the net amount owed or to be received under existing
contracts with that party would exceed 5% of the Fund's assets.
 
  Whether a Fund's use of swap agreements will be successful in furthering its
investment objective will depend on the Adviser's ability to predict correctly
whether certain types of investments are likely to produce greater returns
than other investments. Because they are two-party contracts and because they
may have terms of greater than seven days, swap agreements may be considered
to be illiquid investments. Moreover, a Fund bears the risk of loss of the
amount expected to be received under a swap agreement in the event of the
default or bankruptcy of a swap agreement counterparty. The Funds will enter
into swap agreements only with counterparties that meet certain standards for
creditworthiness (generally, such counterparties would have to be eligible
counterparties under the terms of the Funds' repurchase agreement guidelines).
Certain restrictions imposed on the Funds by the Internal Revenue Code may
limit the Funds' ability to use swap agreements. The swaps market is a
relatively new market and is largely unregulated. It is possible that
developments in the swaps market, including potential government regulation,
could adversely affect a Fund's ability to terminate existing swap agreements
or to realize amounts to be received under such agreements.
   
  Futures Contracts and Options on Futures Contracts Each of the Fixed Income
Funds (except the PIMCO Money Market and Municipal Bond Funds) may invest in
interest rate futures contracts and options thereon ("futures options"), and
to the extent it may invest in foreign currency-denominated securities, may
also invest in foreign currency futures contracts and options thereon. The
PIMCO Municipal Bond Fund may purchase and sell futures contracts on U.S.
Government securities and Municipal Bonds, as well as purchase put and call
options on such futures contracts. Each of the Stock Funds and the PIMCO
Strategic Balanced Fund may invest in interest rate, stock index and foreign
currency futures contracts and options thereon.     
 
  There are several risks associated with the use of futures and futures
options for hedging purposes. There can be no guarantee that there will be a
correlation between price movements in the hedging vehicle and in the
portfolio securities being hedged. An incorrect correlation could result in a
loss on both the hedged securities in a Fund and the hedging vehicle so that
the portfolio return might have been greater had hedging not been attempted.
There can be no assurance that a liquid market will exist at a time when a
Fund seeks to close out a futures contract or a futures option position. Most
futures exchanges and boards of trade limit the amount of fluctuation
permitted in futures contract prices during a single day; once the daily limit
has been reached on a particular contract, no trades may be made that day at a
price beyond that limit. In addition, certain of these instruments are
relatively new and without a significant trading history. As a result, there
is no assurance that an active secondary market will develop or continue to
exist. Lack of a liquid market for any reason may prevent a Fund from
liquidating an unfavorable position, and the Fund would remain obligated to
meet margin requirements until the position is closed.
 
  The Funds may write covered straddles consisting of a call and a put written
on the same underlying futures contract. A straddle will be covered when
sufficient assets are deposited to meet the Funds' immediate obligations. A
Fund may use the same liquid assets to cover both the call and put options
where the exercise price of the call and put are the same, or the exercise
price of the call is higher than that of the put. In such cases, the Funds
will also segregate liquid assets equivalent to the amount, if any, by which
the put is "in the money."
 
  The Funds will only enter into futures contracts or futures options which
are standardized and traded on a U.S. or foreign exchange or board of trade,
or similar entity, or quoted on an automated quotation system. Each Fund will
use
 
43  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
financial futures contracts and related options only for "bona fide hedging"
purposes, as such term is defined in applicable regulations of the Commodity
Futures Trading Commission ("CFTC"), or, with respect to positions in
financial futures and related options that do not qualify as "bona fide
hedging" positions, will enter such positions only to the extent that
aggregate initial margin deposits plus premiums paid by it for open futures
option positions, less the amount by which any such positions are "in-the-
money," would not exceed 5% of the Fund's net assets.
 
HYBRID INSTRUMENTS
 
  A hybrid instrument can combine the characteristics of securities, futures,
and options. For example, the principal amount or interest rate of a hybrid
could be tied (positively or negatively) to the price of some commodity,
currency or securities index or another interest rate (each a "benchmark").
The interest rate or (unlike most fixed income securities) the principal
amount payable at maturity of a hybrid security may be increased or decreased,
depending on changes in the value of the benchmark.
 
  Hybrids can be used as an efficient means of pursuing a variety of
investment goals, including currency hedging, duration management, and
increased total return. Hybrids may not bear interest or pay dividends. The
value of a hybrid or its interest rate may be a multiple of a benchmark and,
as a result, may be leveraged and move (up or down) more steeply and rapidly
than the benchmark. These benchmarks may be sensitive to economic and
political events, such as commodity shortages and currency devaluations, which
cannot be readily foreseen by the purchaser of a hybrid. Under certain
conditions, the redemption value of a hybrid could be zero. Thus, an
investment in a hybrid may entail significant market risks that are not
associated with a similar investment in a traditional, U.S. dollar-denominated
bond that has a fixed principal amount and pays a fixed rate or floating rate
of interest. The purchase of hybrids also exposes a Fund to the credit risk of
the issuer of the hybrids. These risks may cause significant fluctuations in
the net asset value of the Fund. Accordingly, no Fund will invest more than 5%
of its assets in hybrid instruments.
 
  Certain issuers of structured products such as hybrid instruments may be
deemed to be investment companies as defined in the 1940 Act. As a result, the
Funds' investments in these products will be subject to limits applicable to
investments in investment companies and may be subject to restrictions
contained in the 1940 Act.
   
CATASTROPHE
BONDS     
   
  Each of the Fixed Income Funds (except the PIMCO Money Market Fund) and the
PIMCO StocksPLUS Fund may invest in "catastrophe bonds." Catastrophe bonds are
fixed income securities, for which the return of principal and payment of
interest is contingent on the non-occurrence of a specific "trigger"
catastrophic event, such as a hurricane or an earthquake. They may be issued
by government agencies, insurance companies, reinsurers, special purpose
corporations or other on-shore or off-shore entities. If a trigger event
causes losses exceeding a specific amount in the geographic region and time
period specified in a bond, a Fund investing in the bond may lose a portion or
all of its principal invested in the bond. If no trigger event occurs, the
Fund will recover its principal plus interest. For some catastrophe bonds, the
trigger event or losses may be based on companywide losses, index-portfolio
losses, industry indices, or readings of scientific instruments rather than
specified actual losses. Often the catastrophe bonds provide for extensions of
maturity that are mandatory, or optional at the discretion of the issuer, in
order to process and audit loss claims in those cases where a trigger event
has, or possibly has, occurred. In addition to the specified trigger events,
catastrophe bonds may also expose the Fund to certain unanticipated risks
including but not limited to issuer (credit) default, adverse regulatory or
jurisdictional interpretations, and adverse tax consequences.     
   
  Catastrophe bonds are a relatively new type of financial instrument. As
such, there is no significant trading history of these securities, and there
can be no assurance that a liquid market in these instruments will develop.
See "Illiquid     
 
                                                  August 1, 1998 Prospectus  44
<PAGE>
 
   
Securities" below. Lack of a liquid market may impose the risk of higher
transaction costs and the possibility that a Fund may be forced to liquidate
positions when it would not be advantageous to do so. Catastrophe bonds are
typically rated, and a Fund will only invest in catastrophe bonds that meet
the credit quality requirements for the Fund.     
 
INVESTMENT IN INVESTMENT COMPANIES
 
  Each of the Funds may invest in securities of other investment companies,
such as closed-end management investment companies, or in pooled accounts or
other investment vehicles. As a shareholder of an investment company, a Fund
may indirectly bear service and other fees which are in addition to the fees
the Fund pays its service providers.
 
ILLIQUID SECURITIES
 
  Each of the Funds may invest up to 15% of its net assets in illiquid
securities (10% in the case of the PIMCO Money Market Fund). Certain illiquid
securities may require pricing at fair value as determined in good faith under
the supervision of the Board of Trustees. The Adviser may be subject to
significant delays in disposing of illiquid securities, and transactions in
illiquid securities may entail registration expenses and other transaction
costs that are higher than those for transactions in liquid securities. The
term "illiquid securities" for this purpose means securities that cannot be
disposed of within seven days in the ordinary course of business at
approximately the amount at which a Fund has valued the securities. Illiquid
securities are considered to include, among other things, written over-the-
counter options, securities or other liquid assets being used as cover for
such options, repurchase agreements with maturities in excess of seven days,
certain loan participation interests, fixed time deposits which are not
subject to prepayment or provide for withdrawal penalties upon prepayment
(other than overnight deposits), securities that are subject to legal or
contractual restrictions on resale and other securities which legally or in
the Adviser's opinion may be deemed illiquid (not including securities issued
pursuant to Rule 144A under the Securities Act of 1933 and certain commercial
paper that PIMCO has determined to be liquid under procedures approved by the
Board of Trustees).
 
  Illiquid securities may include privately placed securities, which are sold
directly to a small number of investors, usually institutions. Unlike public
offerings, such securities are not registered under the federal securities
laws. Although certain of these securities may be readily sold, for example,
under Rule 144A, others may be illiquid, and their sale may involve
substantial delays and additional costs.
 
SERVICE SYSTEMS--YEAR 2000 PROBLEM
 
  Many of the services provided to the Funds depend on the smooth functioning
of computer systems. Many systems in use today cannot distinguish between the
year 1900 and the year 2000. Should any of the service systems fail to process
information properly, that could have an adverse impact on the Funds'
operations and services provided to shareholders. The Adviser, Distributor,
Shareholder Servicing and Transfer Agent, Custodian, and certain other service
providers to the Funds have reported that each is working toward mitigating
the risks associated with the so-called "year 2000 problem." However, there
can be no assurance that the problem will be corrected in all respects and
that the Funds' operations and services provided to shareholders will not be
adversely affected.
 
45  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                            MANAGEMENT OF THE TRUST
 
  The business affairs of the Trust are managed under the direction of the
Board of Trustees. The Trustees are Guilford C. Babcock, R. Wesley Burns, Vern
O. Curtis, Brent R. Harris, Thomas P. Kemp, and William J. Popejoy. Additional
information about the Trustees and the Trust's executive officers may be found
in the Statement of Additional Information under the heading "Management--
Trustees and Officers."
 
INVESTMENT ADVISER
   
  Pacific Investment Management Company ("PIMCO") serves as investment adviser
("Adviser") to the Funds pursuant to an investment advisory contract. The
Adviser is an investment management company founded in 1971, and had
approximately $138 billion in assets under management as of June 30, 1998.
       
  PIMCO is a subsidiary of PIMCO Advisors L.P. ("PIMCO Advisors"). The general
partners of PIMCO Advisors are PIMCO Partners, G.P. and PIMCO Advisors
Holdings L.P. ("PAH"). PIMCO Partners, G.P. is a general partnership between
PIMCO Holding LLC, a Delaware limited liability company and an indirect
wholly-owned subsidiary of Pacific Life Insurance Company, and PIMCO Partners
LLC, a California limited liability company controlled by the PIMCO
Managing Directors. PIMCO Partners, G.P. is the sole general partner of PAH.
PIMCO's address is 840 Newport Center Drive, Suite 300, Newport Beach,
California 92660. PIMCO is registered as an investment adviser with the
Securities and Exchange Commission ("SEC") and as a commodity trading advisor
with the CFTC.     
 
  The Adviser manages the investment and reinvestment of the assets of each
Fund. The Adviser is responsible for placing orders for the purchase and sale
of each Fund's investments directly with brokers or dealers selected by it in
its discretion. See "Portfolio Transactions."
 
                                                  August 1, 1998 Prospectus  46
<PAGE>
 
  Information about the individual portfolio managers responsible for
management of the Trust's currently operational Funds, including their
occupations for the past five years, is provided below.
 
<TABLE>
<CAPTION>
                                PORTFOLIO MANAGER AND BUSINESS EXPERIENCE (PAST
 FUND                           FIVE YEARS)
 ----                           -----------------------------------------------
 <C>                            <S>
 Money Market Fund              Leslie Barbi, Senior Vice President, PIMCO. A
                                Fixed Income Portfolio Manager, Ms. Barbi has
                                managed the PIMCO Money Market Fund since
                                November 1, 1995. Prior to joining PIMCO in
                                1993, Ms. Barbi was associated with Salomon
                                Brothers as a proprietary Portfolio Manager.
 Short-Term Fund                William H. Gross, Managing Director, PIMCO. A
 Low Duration Fund              Fixed Income Portfolio Manager, Mr. Gross is
 Low Duration Fund II           one of the founders of PIMCO and has managed
 Low Duration Fund III          the PIMCO Low Duration, Low Duration II, Low
 Moderate Duration Fund         Duration III, Total Return, Total Return II and
 Total Return Fund              Total Return III Funds since their inception,
 Total Return Fund II           May 11, 1987, November 1, 1991, December 31,
 Total Return Fund III          1996, May 11, 1987, December 30, 1991, and May
 Strategic Balanced Fund        1, 1991, respectively. Mr. Gross is the leader
 StocksPLUS Fund                of the team which has managed the PIMCO Short-
                                Term, StocksPLUS, Strategic Balanced and
                                Moderate Duration Funds since January 6, 1998.
 Low Duration Mortgage Fund     William C. Powers, Managing Director, PIMCO. A
                                Fixed Income Portfolio Manager, Mr. Powers
                                joined PIMCO in 1991.
 Real Return Bond Fund          John Brynjolfsson, Vice President, PIMCO. A
                                Fixed Income Portfolio Manager, Mr.
                                Brynjolfsson joined PIMCO in 1989, and has
                                managed the PIMCO Real Return Bond Fund since
                                its inception, January 29, 1997.
 Total Return Mortgage Fund     Pasi Hamalainen, Executive Vice President,
 Long-Term U.S. Government Fund PIMCO. A Fixed Income Portfolio Manager, Mr.
                                Hamalainen joined PIMCO in 1994 and has managed
                                the PIMCO Long-Term U.S. Government Fund since
                                July 1, 1997 and the Total Return Mortgage Fund
                                since its inception, July 31, 1997.
 High Yield Fund                Benjamin Trosky, Managing Director, PIMCO. A
                                Fixed Income Portfolio Manager, Mr. Trosky
                                joined PIMCO in 1990 and has managed the PIMCO
                                High Yield Fund since its inception, December
                                16, 1992.
 Global Bond Fund               Lee R. Thomas, III, Managing Director and
 Global Bond Fund II            Senior International Portfolio Manager, PIMCO.
 Foreign Bond Fund              A Fixed Income Portfolio Manager, Mr. Thomas
 International Bond Fund        has managed the PIMCO Foreign Bond, Global Bond
                                and International Bond Funds since July 13,
                                1995, and the PIMCO Global Bond Fund II since
                                October 1, 1995. Prior to joining PIMCO in
                                1995, Mr. Thomas was associated with Investcorp
                                as a member of the management committee
                                responsible for global securities and foreign
                                exchange trading. Prior to Investcorp, he was
                                associated with Goldman Sachs as an Executive
                                Director in foreign fixed income.
 Emerging Markets Bond Fund     Michael J. Rosborough, Senior Vice President,
 Emerging Markets Bond Fund II  PIMCO . A Fixed Income Portfolio Manager, Mr.
                                Rosborough was associated with RBC Dominion in
                                Tokyo as a Vice President and Manager in
                                foreign fixed income prior to joining PIMCO in
                                1994.
 Municipal Bond Fund            Benjamin Ehlert, Executive Vice President,
                                PIMCO. A Fixed Income Portfolio Manager, Mr.
                                Ehlert has been associated with PIMCO for over
                                23 years.
</TABLE>
 
FUND ADMINISTRATOR
 
  PIMCO also serves as administrator for the Funds' Institutional Class and
Administrative Class shares pursuant to an administration agreement with the
Trust. PIMCO provides administrative services for Institutional Class and
Administrative Class shareholders of the Funds, which include clerical help
and accounting, bookkeeping, internal audit services, and certain other
services required by the Funds, preparation of reports to the Funds'
shareholders and regulatory filings. In addition, PIMCO, at its own expense,
arranges for the provision of legal, audit, custody, transfer agency and other
services for the Funds, and is responsible for the costs of registration of
the Trust's shares and the printing of prospectuses and shareholder reports
for current shareholders.
 
47  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  The Funds (and not PIMCO) are responsible for the following expenses:
(i) salaries and other compensation of any of the Trust's executive officers
and employees who are not officers, directors, stockholders or employees of
PIMCO or its subsidiaries or affiliates; (ii) taxes and governmental fees;
(iii) brokerage fees and commissions and other portfolio transaction expenses;
(iv) the costs of borrowing money, including interest expenses; (v) fees and
expenses of the Trustees who are not "interested persons" of PIMCO or the
Trust, and any counsel retained exclusively for their benefit; (vi)
extraordinary expenses, including costs of litigation and indemnification
expenses; (vii) expenses, such as organizational expenses, which are
capitalized in accordance with generally accepted accounting principles; and
(viii) any expenses allocated or allocable to a specific class of shares,
which include fees payable with respect to the Administrative Class shares,
and may include certain other expenses as permitted by the Trust's Multi-Class
Plan adopted pursuant to Rule 18f-3 under the 1940 Act and subject to review
and approval by the Trustees.
 
ADVISORY AND ADMINISTRATIVE FEES
 
  The Funds feature fixed advisory and administrative fee rates. For providing
investment advisory and administrative services to the Funds as described
above, PIMCO receives monthly fees from each Fund at an annual rate based on
the average daily net assets of the Fund as follows:
 
<TABLE>
<CAPTION>
                                                                    ADVISORY
   FUND                                                             FEE RATE
   ----                                                             --------
   <S>                                                           <C>
   Money Market Fund............................................     0.15%
   Commercial Mortgage Securities, Strategic Balanced,
    StocksPLUS and
    StocksPLUS Short Strategy Funds.............................     0.40%
   Emerging Markets Bond and Emerging Markets Bond II Funds.....     0.45%
   All other Funds..............................................     0.25%
<CAPTION>
                                                                 ADMINISTRATIVE
   FUND                                                             FEE RATE
   ----                                                          --------------
   <S>                                                           <C>
   Money Market, Short-Term and Moderate Duration Funds.........     0.20%
   Low Duration and Total Return Funds..........................     0.18%
   Global Bond and Global Bond II Funds.........................     0.30%
   Emerging Markets Bond and Emerging Markets Bond II Funds.....     0.40%
   All other Funds..............................................     0.25%
</TABLE>
 
  Both the investment advisory contract and administration agreement for the
Funds may be terminated by the Trustees at any time on 60 days' written
notice. The investment advisory contract may be terminated by PIMCO on 60
days' written notice. Following the expiration of the two-year period
commencing with the effectiveness of the administration agreement, it may be
terminated by PIMCO on 60 days' written notice. Following their initial two-
year terms, the investment advisory contract and administration agreement will
continue from year to year if approved by the Trustees.
 
SERVICE AND DISTRIBUTION FEES
 
  The Trust has adopted an Administrative Services Plan and a Distribution
Plan (the "Plans") with respect to the Administrative Class shares of each
Fund. Under the terms of the Plans, the Trust is permitted to reimburse, out
of the Administrative Class assets of each Fund, in an amount up to 0.25% on
an annual basis of the average daily net assets of that class, financial
intermediaries that provide services in connection with the distribution and
marketing of shares and/or the provision of certain shareholder services (in
the case of the Distribution Plan) or the administration of plans or programs
that use Fund shares as their funding medium (in the case of the
Administrative Services Plan), and to reimburse certain other related
expenses. The same entity may not receive both distribution and administrative
services fees with respect to the same assets but may with respect to separate
assets receive fees under both a Distribution Plan
 
                                                  August 1, 1998 Prospectus  48
<PAGE>
 
and Administrative Services Plan. Fees paid pursuant to either type of Plan
may be paid for shareholder service and the maintenance of accounts and
therefore may constitute "service fees" for purposes of applicable rules of
the National Association of Securities Dealers, Inc. Each Plan has been
adopted in accordance with the requirements of Rule 12b-1 under the 1940 Act
and will be administered in accordance with the provisions of that rule,
except that shareholders will not have the voting rights set forth in Rule
12b-1 with respect to the Administrative Services Plan that they will have
with respect to the Distribution Plan. For more complete disclosure regarding
the Plans and their terms, see the Statement of Additional Information.
   
  Institutional and Administrative Class shares of the Trust may also be
offered through certain brokers and financial intermediaries ("service
agents") that have established a shareholder servicing relationship with the
Trust on behalf of their customers. The Trust pays no compensation to such
entities other than service fees paid with respect to Administrative Class
shares. Service agents may impose additional or different conditions on the
purchase or redemption of Fund shares by their customers and may charge their
customers transaction or other account fees on the purchase and redemption of
Fund shares. Each service agent is responsible for transmitting to its
customers a schedule of any such fees and information regarding any additional
or different conditions regarding purchases and redemptions. Shareholders who
are customers of service agents should consult their service agent for
information regarding these fees and conditions.     
 
DISTRIBUTOR
 
  Shares of the Trust are distributed through PIMCO Funds Distributors LLC
(the "Distributor"), a wholly owned subsidiary of PIMCO Advisors. The
Distributor, which is located at 2187 Atlantic Street, Stamford, Connecticut
06902, is a broker-dealer registered with the SEC.
 
                              PURCHASE OF SHARES
 
  Each Fund offers its shares in up to six classes: Institutional Class,
Administrative Class, Class A, Class B, Class C, and Class D. This Prospectus
relates only to the Institutional Class and Administrative Class shares of the
Funds. For information regarding Class A, Class B, Class C, and Class D
shares, see "Other Information--Multiple Classes of Shares" below.
 
  Shares of the Institutional Class are offered primarily for direct
investment by investors such as pension and profit-sharing plans, employee
benefit trusts, endowments, foundations, corporations and high net worth
individuals (Institutional Class shares may also be offered through certain
financial intermediaries that charge their customers transaction or other fees
with respect to their customers' investments in the Funds). Shares of the
Administrative Class are offered primarily through employee benefit plan
alliances, broker-dealers, and other intermediaries, and each Fund pays
service and/or distribution fees to such entities for services they provide to
shareholders of that class.
   
  Shares of either the Institutional Class or the Administrative Class of the
Funds may be purchased at the relevant net asset value of that class without a
sales charge. The minimum initial investment for shares of either class is $5
million, except that the minimum initial investment for a registered
investment adviser purchasing Institutional Class shares for its clients
through omnibus accounts is $250,000 per Fund. Shares of either class may also
be offered to clients of the Adviser and its affiliates and to the benefit
plans of the Adviser and its affiliates. Shares of the PIMCO International
Bond and Emerging Markets Bond II Funds are offered only to clients of PIMCO
who maintain separately managed private accounts. In addition, the minimum
initial investment does not apply to shares of the Institutional Class offered
through fee-based programs sponsored and maintained by a registered broker-
dealer and approved by the Distributor pursuant to which each investor pays an
asset based fee to a financial intermediary for investment advisory and/or
administrative services.     
 
49  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  Pension and profit-sharing plans, employee benefit trusts and employee
benefit plan alliances and "wrap account" programs established with broker-
dealers or other financial intermediaries may purchase shares of either class
only if the plan or program for which the shares are being acquired will
maintain an omnibus or pooled account for each Fund and will not require a
Fund to pay any type of administrative payment per participant account to any
third party.
   
  The investment minimums discussed in this section do not apply to
participants in PIMCO Advisors Portfolio Strategies, a managed product
sponsored by PIMCO Advisors.     
 
INITIAL INVESTMENT
   
  An account may be opened by completing and signing a Client Registration
Application and mailing it to PIMCO Funds at the following address: 840
Newport Center Drive, Suite 300, Newport Beach, California 92660. A Client
Registration Application may be obtained by calling (800) 800-0952.     
 
  Except as provided below, purchases of shares can only be made by wiring
federal funds to Investors Fiduciary Trust Company (the "Transfer Agent"), 801
Pennsylvania, Kansas City, Missouri 64105. Before wiring federal funds, the
investor must first telephone the Trust at (800) 927-4648 to receive
instructions for wire transfer, and the following information will be
requested: name of authorized person; shareholder name; shareholder account
number; name of Fund and share class; amount being wired; and wiring bank
name.
 
  Shares may be purchased without first wiring federal funds if the proceeds
of the investment are derived from an advisory account maintained by the
investor with PIMCO, PIMCO Advisors or one of their affiliates; from surrender
or other payment from an annuity, insurance, or other contract held by Pacific
Life Insurance Company; or from an investment by broker-dealers, institutional
clients or other financial intermediaries which have established a shareholder
servicing relationship with the Trust on behalf of their customers.
   
  A purchase order, together with payment in proper form, received by the
Transfer Agent prior to the close of regular trading on the New York Stock
Exchange (the "Exchange") (normally 4:00 p.m., Eastern time) on a day the
Trust is open for business will be effected at that day's net asset value. In
order to facilitate efficient operation of the PIMCO StocksPLUS, StocksPLUS
Short Strategy and Strategic Balanced Funds, the Trust requests that all
purchase or exchange orders for these Funds be received by the Transfer Agent
at least one hour prior to the close of regular trading on the Exchange
(normally 3:00 p.m., Eastern time). An order received after the close of
regular trading on the Exchange will be effected at the net asset value
determined on the next business day. However, orders received by certain
retirement plans and other financial intermediaries by the close of business
and communicated to the Transfer Agent by 9:00 a.m., Eastern time, on the
following business day will be effected at the net asset value determined on
the prior business day. The Trust is "open for business" on each day the
Exchange is open for trading, which excludes the following holidays: New
Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Good Friday,
Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day.
Purchase orders will be accepted only on days on which the Trust is open for
business.     
   
  With respect to the Funds whose policy is to declare dividends daily (i.e.,
each of the Fixed Income Funds except the PIMCO International Bond Fund), if a
purchase order for shares is received prior to 12:00 noon, Eastern time, and
payment in federal funds is received by the Transfer Agent by the close of the
federal funds wire on the day the purchase order is received, dividends will
accrue starting that day. If a purchase order is received after 12:00 noon,
Eastern time, and payment in federal funds is received by the Transfer Agent
by the close of the federal funds wire on the day the purchase order is
received, or as otherwise agreed to by the Trust, the order will be effected
at that day's net asset value, but dividends will not begin to accrue until
the federal funds wire is received.     
 
 
                                                  August 1, 1998 Prospectus  50
<PAGE>
 
ADDITIONAL INVESTMENTS
 
  Additional investments may be made at any time at the relevant net asset
value for that class by calling the Trust and wiring federal funds to the
Transfer Agent as outlined above.
 
OTHER PURCHASE INFORMATION
 
  Purchases of a Fund's Institutional Class and Administrative Class shares
will be made in full and fractional shares. In the interest of economy and
convenience, certificates for shares will not be issued.
 
  The Trust and the Distributor each reserves the right, in its sole
discretion, to suspend the offering of shares of the Funds or to reject any
purchase order, in whole or in part, or to redeem shares, in whole or in part,
when, in the judgment of management, such suspension or rejection is in the
best interests of the Trust. The Trust and the Distributor may also waive the
minimum initial investment for certain investors.
 
  Purchases and sales of Fund shares should be made for long-term investment
purposes only. The Trust and Adviser each reserves the right to restrict
purchases of Fund shares (including exchanges) when a pattern of frequent
purchases and sales made in response to short-term fluctuations in share price
appears evident.
 
  Institutional Class and Administrative Class shares of the Trust are not
qualified or registered for sale in all states. Prospective investors should
inquire as to whether shares of a particular Fund are available for offer and
sale in their state of residence. Shares of the Trust may not be offered or
sold in any state unless registered or qualified in that jurisdiction or
unless an exemption from registration or qualification is available.
 
  Investors may, subject to the approval of the Trust, purchase shares of a
Fund with liquid securities that are eligible for purchase by the Fund
(consistent with such Fund's investment policies and restrictions) and that
have a value that is readily ascertainable in accordance with the Trust's
valuation policies. These transactions will be effected only if the Adviser
intends to retain the security in the Fund as an investment. Assets so
purchased by a Fund will be valued in generally the same manner as they would
be valued for purposes of pricing the Fund's shares, if such assets were
included in the Fund's assets at the time of purchase. The Trust reserves the
right to amend or terminate this practice at any time.
 
RETIREMENT PLANS
 
  Shares of the Funds are available for purchase by retirement plans,
including Keogh plans, 401(k) plans, 403(b) plans and Individual Retirement
Accounts. The administrator of a plan or employee benefits office can provide
participants or employees with detailed information on how to participate in
the plan and how to elect a Fund as an investment option. Participants in a
retirement or savings plan may be permitted to elect different investment
options, alter the amounts contributed to the plan, or change how
contributions are allocated among investment options in accordance with the
plan's specific provisions. The plan administrator or employee benefits office
should be consulted for details. For questions about participant accounts,
participants should contact their employee benefits office, the plan
administrator, or the organization that provides recordkeeping services for
the plan. Investors who purchase shares through retirement plans should be
aware that plan administrators may aggregate purchase and redemption orders
for participants in the plan. Therefore, there may be a delay between the time
the investor places an order with the plan administrator, and the time the
order is forwarded to the Transfer Agent for execution.
 
51  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                             REDEMPTION OF SHARES
 
REDEMPTIONS BY MAIL
   
  Institutional Class and Administrative Class shares may be redeemed by
submitting a written request to PIMCO Funds, 840 Newport Center Drive, Suite
300, Newport Beach, California 92660, stating the Fund from which the shares
are to be redeemed, the class of shares, the number or dollar amount of the
shares to be redeemed and the account number. The request must be signed
exactly as the names of the registered owners appear on the Trust's account
records, and the request must be signed by the minimum number of persons
designated on the Client Registration Application that are required to effect
a redemption. In order to discourage short-term trading, the PIMCO StocksPLUS
Short Strategy Fund imposes a redemption fee, payable to the Fund, of 1% on
all shares of the Fund held for less than three months.     
 
REDEMPTIONS BY TELEPHONE OR OTHER WIRE COMMUNICATION
   
  If an election is made on the Client Registration Application (or
subsequently in writing), redemptions of shares may be requested by calling
the Trust at (800) 927-4648, by sending a facsimile to (949) 760-4456, or by
other means of wire communication. Investors should state the Fund and class
from which the shares are to be redeemed, the number or dollar amount of the
shares to be redeemed and the account number. Redemption requests of an amount
of $10 million or more may be initiated by telephone, but must be confirmed in
writing by an authorized party prior to processing.     
 
  In electing a telephone redemption, the investor authorizes PIMCO and the
Transfer Agent to act on telephone instructions from any person representing
himself to be the investor, and reasonably believed by PIMCO and the Transfer
Agent to be genuine. Neither the Trust nor its Transfer Agent will be liable
for any loss, cost or expense for acting on instructions (whether in writing
or by telephone) believed by the party receiving such instructions to be
genuine and in accordance with the procedures described in this Prospectus.
Shareholders should realize that by electing the telephone or wire redemption
option, they may be giving up a measure of security that they might have if
they were to redeem their shares in writing. Furthermore, interruptions in
telephone service may mean that a shareholder will be unable to effect a
redemption by telephone when desired. The Transfer Agent provides written
confirmation of transactions initiated by telephone as a procedure designed to
confirm that telephone instructions are genuine (written confirmation is also
provided for redemption requests received in writing). All telephone
transactions are recorded, and PIMCO or the Transfer Agent may request certain
information in order to verify that the person giving instructions is
authorized to do so. All redemptions, whether initiated by letter or
telephone, will be processed in a timely manner and proceeds will be forwarded
by wire in accordance with the redemption policies of the Trust detailed
below. See "Redemption of Shares--Other Redemption Information."
 
  Shareholders may decline telephone exchange or redemption privileges after
an account is opened by instructing the Transfer Agent in writing at least
seven business days prior to the date the instruction is to be effective.
Shareholders may experience delays in exercising telephone redemption
privileges during periods of abnormal market activity. During periods of
volatile economic or market conditions, shareholders may wish to consider
transmitting redemption orders by telegram, facsimile or overnight courier.
 
OTHER REDEMPTION INFORMATION
   
  Redemption requests for Fund shares are effected at the net asset value per
share next determined after receipt in good order of the redemption request by
the Trust or its designee. A redemption request received by the Trust or its
designee prior to the close of regular trading on the Exchange (normally 4:00
p.m., Eastern time) on a day the Trust is open for business, is effective on
that day. A redemption request received after that time becomes effective on
the next business day.     
 
                                                  August 1, 1998 Prospectus  52
<PAGE>
 
  Payment of the redemption price will ordinarily be wired to the investor's
bank one business day after the redemption request, but may take up to seven
business days. Redemption proceeds will be sent by wire only to the bank name
designated on the Client Registration Application. The Trust may suspend the
right of redemption or postpone the payment date at times when the Exchange is
closed, or during certain other periods as permitted under the federal
securities laws.
 
  For shareholder protection, a request to change information contained in an
account registration (for example, a request to change the bank designated to
receive wire redemption proceeds) must be received in writing, signed by the
minimum number of persons designated on the Client Registration Application
that are required to effect a redemption, and accompanied by a signature
guarantee from any eligible guarantor institution, as determined in accordance
with the Trust's procedures. Shareholders should inquire as to whether a
particular institution is an eligible guarantor institution. A signature
guarantee cannot be provided by a notary public. In addition, corporations,
trusts, and other institutional organizations are required to furnish evidence
of the authority of the persons designated on the Client Registration
Application to effect transactions for the organization.
   
  Due to the relatively high cost of maintaining small accounts, the Trust
reserves the right to redeem Institutional Class and Administrative Class
shares in any account for their then-current value (which will be promptly
paid to the investor) if at any time, due to redemption by the investor, the
shares in the account do not have a value of at least $100,000. A shareholder
will receive advance notice of a mandatory redemption and will be given at
least 30 days to bring the value of its account up to at least $100,000, or
$10,000, as the case may be. This mandatory redemption policy does not apply
to participants in PIMCO Advisors Portfolio Strategies, a managed product
sponsored by PIMCO Advisors.     
 
  The Trust agrees to redeem shares of each Fund solely in cash up to the
lesser of $250,000 or 1% of the net assets during any 90-day period for any
one shareholder. In consideration of the best interests of the remaining
shareholders, the Trust reserves the right to pay any redemption proceeds
exceeding this amount in whole or in part by a distribution in kind of
securities held by a Fund in lieu of cash. It is highly unlikely that shares
would ever be redeemed in kind. If shares are redeemed in kind, however, the
redeeming shareholder should expect to incur transaction costs upon the
disposition of the securities received in the distribution.
 
EXCHANGE PRIVILEGE
   
  Shares of a Fund may be exchanged for shares of the same class of any other
Fund based on the respective net asset values of the shares involved, except
that shares of the PIMCO International Bond and Emerging Markets Bond II Funds
are available only to private account clients of PIMCO. An exchange may be
made by following the redemption procedure described above under "Redemptions
by Mail" or, if the telephone redemption option has been elected, by calling
the Trust at (800) 927-4648. Shares of a Fund may also be exchanged for shares
of the same class of a series of PIMCO Funds: Multi-Manager Series, an
affiliated mutual fund family composed primarily of equity portfolios managed
by the subsidiary partnerships of PIMCO Advisors. Shareholders interested in
such an exchange may request a prospectus for these funds by contacting PIMCO
Funds at the same address and telephone number as the Trust.     
   
  Exchanges may be made only with respect to Funds, or series of PIMCO Funds:
Multi-Manager Series, registered in the state of residence of the investor or
where an exemption from registration is available. An exchange order is
treated the same for tax purposes as a redemption followed by a purchase and
may result in a capital gain or loss, and special rules may apply in computing
tax basis when determining gain or loss. See "Taxation" in the Statement of
Additional Information. Although each Fund will attempt to give shareholders
prior notice whenever it is reasonably able to do so, it may impose additional
restrictions on exchanges at any time.     
 
53  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
          
  The Trust reserves the right to refuse exchange purchases if, in the
judgment of the Adviser, the purchase would adversely affect a Fund and its
shareholders. In particular, a pattern of exchanges characteristic of "market-
timing" strategies may be deemed by the Adviser to be detrimental to the Trust
or a particular Fund. Currently, the Trust limits the number of "round trip"
exchanges an investor may make. An investor makes a "round trip" exchange when
the investor purchases shares of a particular Fund, subsequently exchanges
those shares for shares of a different Fund, and then exchanges back into the
originally purchased Fund. The Trust has the right to refuse any exchange for
any investor who completes (by making the exchange back into shares of the
originally purchased Fund) more than six round trip exchanges in any twelve-
month period. Although the Trust has no current intention of terminating or
modifying the exchange privilege other than as set forth in the preceding
sentence, it reserves the right to do so at any time.     
 
                            PORTFOLIO TRANSACTIONS
 
  Pursuant to the advisory contract, the Adviser places orders for the
purchase and sale of portfolio investments for the Funds' accounts with
brokers or dealers selected by it in its discretion. In effecting purchases
and sales of portfolio securities for the account of the Funds, the Adviser
will seek the best price and execution of the Funds' orders. In doing so, a
Fund may pay higher commission rates than the lowest available when the
Adviser believes it is reasonable to do so in light of the value of the
brokerage and research services provided by the broker effecting the
transaction.
 
  The Adviser manages the Funds without regard generally to restrictions on
portfolio turnover, except those imposed on its ability to engage in short-
term trading by provisions of the federal tax laws. The use of certain
derivative instruments with relatively short maturities may tend to exaggerate
the portfolio turnover rate for some of the Funds. Trading in fixed income
securities does not generally involve the payment of brokerage commissions,
but does involve indirect transaction costs. The use of futures contracts may
involve the payment of commissions to futures commission merchants. High
portfolio turnover (e.g., over 100%) involves correspondingly greater expenses
to a Fund, including commissions or dealer mark-ups and other transaction
costs on the sale of securities and reinvestments in other securities. Such
sales may result in realization of taxable gains. See "Dividends,
Distributions and Taxes." The portfolio turnover rate for each Fund for which
financial highlights are provided in this Prospectus is set forth under
"Financial Highlights." The portfolio turnover rate for certain of the
remaining Funds is incorporated by reference in the Statement of Additional
Information.
 
  Some securities considered for investment by the Funds may also be
appropriate for other clients served by the Adviser. If a purchase or sale of
securities consistent with the investment policies of a Fund and one or more
of these clients served by the Adviser is considered at or about the same
time, transactions in such securities will be allocated among the Fund and
clients in a manner deemed fair and reasonable by the Adviser. The Adviser may
aggregate orders for the Funds with simultaneous transactions entered into on
behalf of other clients of the Adviser so long as price and transaction
expenses are averaged either for that transaction or for the day.
 
                                                  August 1, 1998 Prospectus  54
<PAGE>
 
                                NET ASSET VALUE
   
  The net asset values of Institutional and Administrative Class shares of
each Fund will be determined once on each day on which the Exchange is open as
of the close of regular trading on the Exchange (normally 4:00 p.m., Eastern
time). Net asset value will not be determined on days on which the Exchange is
closed.     
 
  The PIMCO Money Market Fund's securities are normally valued using the
amortized cost method of valuation. This involves valuing a security at cost
on the date of acquisition and thereafter assuming a constant accretion of a
discount or amortization of a premium to maturity. See the Statement of
Additional Information for a description of certain conditions and procedures
followed by the PIMCO Money Market Fund in connection with amortized cost
valuation. For all other Funds, portfolio securities and other assets for
which market quotations are readily available are stated at market value.
Market value is determined on the basis of last reported sales prices, or if
no sales are reported, as is the case for most securities traded over-the-
counter, at the mean between representative bid and asked quotations obtained
from a quotation reporting system or from established market makers. Fixed
income securities, including those to be purchased under firm commitment
agreements (other than obligations having a maturity of 60 days or less), are
normally valued on the basis of quotations obtained from brokers and dealers
or pricing services, which take into account appropriate factors such as
institutional-sized trading in similar groups of securities, yield, quality,
coupon rate, maturity, type of issue, trading characteristics, and other
market data.
 
  Quotations of foreign securities in foreign currency are converted to U.S.
dollar equivalents using foreign exchange quotations received from independent
dealers. Short-term investments having a maturity of 60 days or less are
valued at amortized cost, when the Board of Trustees determines that amortized
cost is their fair value. Certain fixed income securities for which daily
market quotations are not readily available may be valued, pursuant to
guidelines established by the Board of Trustees, with reference to fixed
income securities whose prices are more readily obtainable and whose durations
are comparable to the securities being valued. Subject to the foregoing, other
securities for which market quotations are not readily available are valued at
fair value as determined in good faith by the Board of Trustees.
 
  Each Fund's liabilities are allocated among its classes. The total of such
liabilities allocated to a class plus that class' distribution and/or
servicing fees and any other expenses specially allocated to that class are
then deducted from the class' proportionate interest in the Fund's assets, and
the resulting amount for each class is divided by the number of shares of that
class outstanding to produce the "net asset value" per share. Under certain
circumstances, the per share net asset value of the Administrative Class
shares of the Funds that do not declare regular income dividends on a daily
basis may be lower than the per share net asset value of the Institutional
Class shares as a result of the daily expense accruals of the service fee
applicable to the Administrative Class shares. Generally, for Funds that pay
income dividends, those dividends are expected to differ over time by
approximately the amount of the expense accrual differential between a
particular Fund's classes.
 
55  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                      DIVIDENDS, DISTRIBUTIONS AND TAXES
 
  Shares begin earning dividends on the effective date of purchase, provided
notification deadlines are met. See "Purchase of Shares." For the Fixed Income
Funds (other than the PIMCO International Bond Fund), dividends are declared
daily from net investment income to shareholders of record at the close of the
previous business day, and distributed to shareholders monthly. The PIMCO
International Bond, Strategic Balanced and Stock Funds intend to declare and
pay as a dividend substantially all of their net investment income on a
quarterly basis. Any net realized capital gains from the sale of portfolio
securities will be distributed no less frequently than once yearly. Dividend
and capital gain distributions of a Fund will be reinvested in additional
shares of that Fund unless the shareholder elects to have them paid in cash.
Dividends from net investment income with respect to Administrative Class
shares will be lower than those paid with respect to Institutional Class
shares, reflecting the payment of service and distribution fees by that class.
 
  Each Fund intends to qualify as a regulated investment company annually and
to elect to be treated as a regulated investment company under the Internal
Revenue Code of 1986, as amended. As such, a Fund generally will not pay
federal income tax on the income and gains it pays as dividends to its
shareholders. In order to avoid a 4% federal excise tax, each Fund intends to
distribute each year substantially all of its net income and gains.
 
  Shareholders subject to U.S. federal income tax will be subject to tax on
dividends received from a Fund, regardless of whether received in cash or
reinvested in additional shares. Distributions received by tax-exempt
shareholders generally will not be subject to federal income tax to the extent
permitted under applicable tax law. All shareholders must treat dividends,
other than capital gain dividends or dividends that represent a return of
capital to shareholders, as ordinary income.
   
  Dividends designated by a Fund as capital gain dividends derived from the
Fund's net capital gain (that is, the excess of net long-term gain over net
short-term loss) are taxable to shareholders as long-term capital gain except
as provided by an applicable tax exemption. Any distributions that are not
from a Fund's net investment income, short-term capital gain, or net capital
gain may be characterized as a return of capital to shareholders or, in some
cases, as capital gain. Certain dividends declared in October, November or
December of a calendar year are taxable to shareholders (who otherwise are
subject to tax on dividends) as though received on December 31 of that year if
paid to shareholders during January of the following calendar year. Each Fund
will advise shareholders annually of the amount and nature of the dividends
paid to them.     
 
  Dividends paid to shareholders by the PIMCO Municipal Bond Fund which are
derived from interest on Municipal Bonds are expected to be designated by the
Fund as "exempt-interest dividends," and shareholders generally may exclude
such dividends from gross income for federal income tax purposes. However, if
a shareholder receives social security or railroad retirement benefits, the
shareholder may be taxed on a portion of those benefits as a result of
receiving tax-exempt income. In addition, certain exempt-interest dividends
could, as discussed below, cause certain shareholders to become subject to the
alternative minimum tax and may increase the alternative minimum tax liability
of shareholders already subject to this tax.
 
  To the extent that dividends paid to shareholders by the PIMCO Municipal
Bond Fund are derived from taxable interest or from capital gains, such
dividends will be subject to federal income tax. Any gain realized on a
redemption of shares will be taxable gain, subject to any applicable tax
exemption for which an investor may qualify.
   
  Dividends derived from interest on certain U.S. Government securities may be
exempt from state and local taxes, although interest on mortgage-backed U.S.
Government securities (for example, interest on FNMA and GNMA     
 
                                                  August 1, 1998 Prospectus  56
<PAGE>
 
   
Certificates) is generally not so exempt. The distributions of "exempt-
interest dividends" paid by the PIMCO Municipal Bond Fund may be exempt from
state and local taxation when received by a shareholder to the extent that
they are derived from interest on Municipal Bonds issued by the state or
political subdivision in which such shareholder resides. The federal exemption
for "exempt-interest dividends" attributable to Municipal Bonds does not
necessarily result in exemption of such dividends from income for the purpose
of state and local taxes. The Trust will report annually on a state-by-state
basis the source of income the PIMCO Municipal Bond Fund receives on Municipal
Bonds that was paid out as dividends during the preceding year.     
 
  The Code also provides that exempt-interest dividends allocable to interest
received from "private activity bonds" issued after August 7, 1986 are an item
of tax preference for individual and corporate alternative minimum tax at the
applicable rate for individuals and corporations. Therefore, if the PIMCO
Municipal Bond Fund invests in such private activity bonds, certain of its
shareholders may become subject to the alternative minimum tax on that part of
its distributions to them that are derived from interest income on such bonds,
and certain shareholders already subject to such tax may have increased
liability therefor. However, it is the present policy of the PIMCO Municipal
Bond Fund to invest no more than 20% of its assets in such bonds. Other
provisions of the Code affect the tax treatment of distributions from the
PIMCO Municipal Bond Fund for corporations, casualty insurance companies, and
financial institutions. In particular, under the Code, for corporations,
alternative minimum taxable income will be increased by a percentage of the
amount by which the corporation's "adjusted current earnings" (which includes
various items of tax exempt income) exceeds the amount otherwise determined to
be alternative minimum taxable income. Accordingly, an investment in the PIMCO
Municipal Bond Fund may cause shareholders to be subject to (or result in an
increased liability under) the alternative minimum tax.
 
  Dividends to shareholders of the PIMCO Municipal Bond Fund derived from
money market instruments and U.S. Government securities are generally taxable
as ordinary income. The Fund may seek to reduce fluctuations in its net asset
value by engaging in portfolio strategies involving options on securities,
futures contracts, and options on futures contracts. Any gain derived by the
Fund from the use of such instruments, including by reason of "marking to
market," will be treated as a combination of short-term and long-term capital
gain and, if not offset by realized capital losses incurred by the Fund, will
be distributed to shareholders (possibly requiring the liquidation of other
portfolio securities) and will be taxable to shareholders as a combination of
ordinary income and long-term capital gain.
   
  Interest accrued by a Fund from inflation-indexed bonds will be includable
in the Fund's gross income in the period in which it accrues. Periodic
adjustments for inflation in the principal value of these securities also may
give rise to original issue discount, which, likewise, will be includable in
the Fund's gross income on a current basis, regardless of whether the Fund
receives any cash payments. See "Taxation--Original Issue Discount" in the
Statement of Additional Information. Amounts includable in a Fund's gross
income become subject to tax-related distribution requirements. Accordingly, a
Fund may be required to make annual distributions to shareholders in excess of
the cash received in a given period from these investments. As a result, the
Fund may be required to liquidate certain investments at a time when it is not
advantageous to do so. If the principal value of an inflation-indexed bond is
adjusted downward in any period as a result of deflation, the reduction may be
treated as a loss to the extent the reduction exceeds coupon payments received
in that period; in that case, the amount distributable by the Fund may be
reduced and amounts distributed previously in the taxable year may be
characterized in some circumstances as a return of capital.     
 
  Taxable shareholders should note that the timing of their investment could
have undesirable tax consequences. If shares are purchased on or just before
the record date of a dividend, taxable shareholders will pay full price for
the shares and may receive a portion of their investment back as a taxable
distribution.
 
57  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  The preceding discussion relates only to federal income tax; the
consequences under other tax laws may differ. For additional information
relating to the tax aspects of investing in a Fund, see the Statement of
Additional Information.
 
                               OTHER INFORMATION
 
CAPITALIZATION
 
  The Trust was organized as a Massachusetts business trust on February 19,
1987. The Board of Trustees may establish additional portfolios in the future.
The capitalization of the Trust consists solely of an unlimited number of
shares of beneficial interest with a par value of $0.0001 each. When issued,
shares of the Trust are fully paid, non-assessable and freely transferable.
 
  Under Massachusetts law, shareholders could, under certain circumstances, be
held personally liable for the obligations of the Trust. However, the
Declaration of Trust disclaims liability of the shareholders, Trustees or
officers of the Trust for acts or obligations of the Trust, which are binding
only on the assets and property of the Trust, and requires that notice of the
disclaimer be given in each contract or obligation entered into or executed by
the Trust or the Trustees. The Declaration of Trust also provides for
indemnification out of Trust property for all loss and expense of any
shareholder held personally liable for the obligations of the Trust. The risk
of a shareholder incurring financial loss on account of shareholder liability
is limited to circumstances in which such disclaimer is inoperative or the
Trust itself is unable to meet its obligations, and thus should be considered
remote.
 
MULTIPLE CLASSES OF SHARES
   
  In addition to Institutional and Administrative Class shares, certain Funds
also offer Class A, Class B, Class C, and Class D shares through separate
prospectuses. This Prospectus relates only to the Institutional Class and
Administrative Class shares of the Funds. The other classes of the Funds have
different sales charges and expense levels, which will affect performance
accordingly. To obtain more information about the other classes of shares,
please call the Distributor at 800-426-0107 (for Class A, Class B and Class C)
or 888-87-PIMCO (for Class D).     
 
VOTING
 
  Shareholders have the right to vote on the election of Trustees and on any
and all matters on which the law or the Declaration of Trust states they may
be entitled to vote. The Trust is not required to hold regular annual meetings
of Trust shareholders and does not intend to do so. Shareholders of a class of
shares or Fund have separate voting rights with respect to matters that only
affect that class or Fund. See "Other Information--Voting Rights" in the
Statement of Additional Information.
 
  The Declaration of Trust provides that the holders of not less than two-
thirds of the outstanding shares of the Trust may remove a person serving as
Trustee either by declaration in writing or at a meeting called for such
purpose. The Trustees are required to call a meeting for the purpose of
considering the removal of a person serving as Trustee if requested in writing
to do so by the holders of not less than 10% of the outstanding shares of the
Trust.
   
  Shares entitle their holders to one vote per share (with proportionate
voting for fractional shares). As of July 7, 1998, the following were
shareholders of record of at least 25% of the outstanding voting securities of
the indicated Funds: William Barron Hilton, Trustee (Beverly Hills,
California) with respect to the PIMCO Short-Term Fund; Sprint Corporation
(Westwood, Kansas) with respect to the PIMCO Low Duration Fund II; Loyola
Academy Endowment Fund (Chicago, Illinois) and Sisters of St. Joseph/Michigan
(Nazareth, Michigan) with respect to the PIMCO Low Duration     
 
                                                  August 1, 1998 Prospectus  58
<PAGE>
 
   
Fund III; National Financial Services Corporation (New York, New York) with
respect to the Real Return Bond Fund; Charles Schwab & Co., Inc. (San
Francisco, California) with respect to the PIMCO Foreign Bond Fund; IBM
Retirement Plan (Brooklyn, New York) with respect to the PIMCO Emerging
Markets Bond Fund II; and California Community Foundation (Los Angeles,
California) with respect to the PIMCO Strategic Balanced Fund. To the extent
such shareholders are also the beneficial owners of such securities, they may
be deemed to control (as that term is defined in the 1940 Act) the relevant
Fund. As used in this Prospectus, the phrase "vote of a majority of the
outstanding shares" of a Fund (or the Trust) means the vote of the lesser of:
(1) 67% of the shares of the Fund (or the Trust) present at a meeting, if the
holders of more than 50% of the outstanding shares are present in person or by
proxy; or (2) more than 50% of the outstanding shares of the Fund (or the
Trust).     
 
PERFORMANCE INFORMATION
 
  The Trust may, from time to time, include the yield and total return for
each class of shares of its Funds in advertisements or reports to shareholders
or prospective investors. Yield quotations for the PIMCO Money Market Fund may
include current yield and effective yield. Current yield will be based on
income received by a hypothetical investment over a given seven-day period
(less expenses accrued during the period) and "annualized" (i.e., assuming
that the seven-day yield would be received for 52 weeks, stated in terms of an
annual percentage return on the investment). Effective yield for the Fund is
calculated in the manner similar to that used to calculate current yield, but
reflects the compounding effect on earnings of reinvested dividends. For the
remaining Funds, quotations of yield for a Fund or class will be based on the
investment income per share (as defined by the SEC) during a particular 30-day
(or one-month) period (including dividends and interest), less expenses
accrued during the period ("net investment income"), and will be computed by
dividing net investment income by the maximum public offering price per share
on the last day of the period. The tax equivalent yield of the PIMCO Municipal
Bond Fund's shares may also be advertised, calculated like yield except that,
for any given tax bracket, net investment income will be calculated as the sum
of (i) any taxable income of the class plus (ii) the tax exempt income of the
class divided by the difference between 1 and the effective federal income tax
rates for taxpayers in that tax bracket.
 
  Quotations of average annual total return for a Fund or class will be
expressed in terms of the average annual compounded rate of return of a
hypothetical investment in the Fund or class over periods of one, five and ten
years (up to the life of the Fund), reflect the deduction of a proportional
share of Fund or class expenses (on an annual basis), and assume that all
dividends and distributions are reinvested when paid. Total return for each
class is measured by comparing the value of an investment in the Fund at the
beginning of the relevant period to the redemption value of the investment in
the Fund at the end of the period (assuming immediate reinvestment of any
dividends or capital gains distributions at net asset value). The Funds may
advertise total return using alternative methods that reflect all elements of
return, but that may be adjusted to reflect the cumulative impact of
alternative fee and expense structures, such as the currently effective
advisory and administrative fees for the Funds.
 
  The Trust also may provide current distribution information to its
shareholders in shareholder reports or other shareholder communications, or in
certain types of sales literature provided to prospective investors. Current
distribution information for a particular class of a Fund will be based on
distributions for a specified period (i.e., total dividends from net
investment income), divided by the relevant class net asset value per share on
the last day of the period and annualized. The rate of current distributions
does not reflect deductions for unrealized losses from transactions in
derivative instruments such as options and futures, which may reduce total
return. Current distribution rates differ from standardized yield rates in
that they represent what a class of a Fund has declared and paid to
shareholders as of the end of a specified period rather than the Fund's actual
net investment income for that period.
 
59  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  Performance information for the Trust may also be compared to various
unmanaged indexes, such as the Standard & Poor's 500 Composite Stock Price
Index, the Lehman Brothers Aggregate Bond Index, the Lehman Brothers Mortgage-
Backed Securities Index, the Merrill Lynch 1 to 3 Year Treasury Index, the
Lehman Intermediate and 20+ Year Treasury Blend Index, the Lehman BB
Intermediate Corporate Index, indexes prepared by Lipper Analytical Services,
the J.P. Morgan Global Index, the J.P. Morgan Emerging Markets Bond Index
Plus, the Salomon Brothers World Government Bond Index-10 Non U.S.-Dollar
Hedged and the J.P. Morgan Government Bond Index Non U.S.-Dollar Hedged, and
other entities or organizations which track the performance of investment
companies or investment advisers. Unmanaged indexes (i.e., other than Lipper)
generally do not reflect deductions for administrative and management costs
and expenses. PIMCO may also report to shareholders or to the public in
advertisements concerning the performance of PIMCO as adviser to clients other
than the Trust, and on the comparative performance or standing of PIMCO in
relation to other money managers. Such comparative information may be compiled
or provided by independent ratings services or by news organizations. Any
performance information, whether related to the Funds or to the Adviser,
should be considered in light of a Fund's investment objectives and policies,
characteristics and quality of the portfolio, and the market conditions during
the time period indicated, and should not be considered to be representative
of what may be achieved in the future. For a description of the methods used
to determine yield and total return for the Funds, see the Statement of
Additional Information.
   
  Investment results of the Funds will fluctuate over time, and any
presentation of the Funds' total return or yield for any prior period should
not be considered as a representation of what an investor's total return or
yield may be in any future period.     
 
                                                  August 1, 1998 Prospectus  60
<PAGE>
 
                                  APPENDIX A
 
                            DESCRIPTION OF DURATION
 
  Duration is a measure of the expected life of a fixed income security that
was developed as a more precise alternative to the concept of "term to
maturity." Traditionally, a fixed income security's "term to maturity" has
been used as a proxy for the sensitivity of the security's price to changes in
interest rates (which is the "interest rate risk" or "volatility" of the
security). However, "term to maturity" measures only the time until a fixed
income security provides its final payment, taking no account of the pattern
of the security's payments prior to maturity. In contrast, duration
incorporates a bond's yield, coupon interest payments, final maturity and call
features into one measure. Duration management is one of the fundamental tools
used by the Adviser.
 
  Duration is a measure of the expected life of a fixed income security on a
present value basis. Duration takes the length of the time intervals between
the present time and the time that the interest and principal payments are
scheduled or, in the case of a callable bond, expected to be received, and
weights them by the present values of the cash to be received at each future
point in time. For any fixed income security with interest payments occurring
prior to the payment of principal, duration is always less than maturity. In
general, all other things being equal, the lower the stated or coupon rate of
interest of a fixed income security, the longer the duration of the security;
conversely, the higher the stated or coupon rate of interest of a fixed income
security, the shorter the duration of the security.
 
  Futures, options and options on futures have durations which, in general,
are closely related to the duration of the securities which underlie them.
Holding long futures or call option positions (backed by a segregated account
of cash and cash equivalents) will lengthen a Fund's duration by approximately
the same amount that holding an equivalent amount of the underlying securities
would.
 
  Short futures or put option positions have durations roughly equal to the
negative duration of the securities that underlie these positions, and have
the effect of reducing portfolio duration by approximately the same amount
that selling an equivalent amount of the underlying securities would.
 
  There are some situations where even the standard duration calculation does
not properly reflect the interest rate exposure of a security. For example,
floating and variable rate securities often have final maturities of ten or
more years; however, their interest rate exposure corresponds to the frequency
of the coupon reset. For inflation-indexed bonds, duration is calculated on
the basis of modified real duration, which measures price changes of
inflation-indexed bonds on the basis of changes in real, rather than nominal,
interest rates. Another example where the interest rate exposure is not
properly captured by duration is the case of mortgage pass-through securities.
The stated final maturity of such securities is generally 30 years, but
current prepayment rates are more critical in determining the securities'
interest rate exposure. Finally, the duration of a fixed income security may
vary over time in response to changes in interest rates and other market
factors. In these and other similar situations, the Adviser will use more
sophisticated analytical techniques that incorporate the anticipated economic
life of a security into the determination of its interest rate exposure.
 
 
A-1  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                                  APPENDIX B
 
                       DESCRIPTION OF SECURITIES RATINGS
 
  Certain of the Funds make use of average portfolio credit quality standards
to assist institutional investors whose own investment guidelines limit their
investments accordingly. In determining a Fund's overall dollar-weighted
average quality, unrated securities are treated as if rated, based on the
Adviser's view of their comparability to rated securities. A Fund's use of
average quality criteria is intended to be a guide for those institutional
investors whose investment guidelines require that assets be invested
according to comparable criteria. Reference to an overall average quality
rating for a Fund does not mean that all securities held by the Fund will be
rated in that category or higher. A Fund's investments may range in quality
from securities rated in the lowest category in which the Fund is permitted to
invest to securities rated in the highest category (as rated by Moody's or S&P
or, if unrated, determined by the Adviser to be of comparable quality). The
percentage of a Fund's assets invested in securities in a particular rating
category will vary. Following is a description of Moody's and S&P's ratings
applicable to fixed income securities.
 
MOODY'S INVESTORS SERVICE, INC.
 
 CORPORATE AND MUNICIPAL BOND RATINGS
 
  Aaa: Bonds which are rated Aaa are judged to be of the best quality. They
carry the smallest degree of investment risk and are generally referred to as
"gilt edge." Interest payments are protected by a large or by an exceptionally
stable margin and principal is secure. While the various protective elements
are likely to change, such changes as can be visualized are most unlikely to
impair the fundamentally strong position of such issues.
 
  Aa: Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group they comprise what are generally known
as high-grade bonds. They are rated lower than the best bonds because margins
of protection may not be as large as in Aaa securities or fluctuation of
protective elements may be of greater amplitude or there may be other elements
present that make the long-term risks appear somewhat larger than with Aaa
securities.
 
  A: Bonds which are rated A possess many favorable investment attributes and
are to be considered as upper-medium-grade obligations. Factors giving
security to principal and interest are considered adequate but elements may be
present that suggest a susceptibility to impairment sometime in the future.
 
  Baa: Bonds which are rated Baa are considered as medium-grade obligations
(i.e., they are neither highly protected nor poorly secured). Interest
payments and principal security appear adequate for the present but certain
protective elements may be lacking or may be characteristically unreliable
over any great length of time. Such bonds lack outstanding investment
characteristics and in fact have speculative characteristics as well.
 
  Ba: Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well-assured. Often the protection of interest
and principal payments may be very moderate and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.
 
  B: Bonds which are rated B generally lack characteristics of a desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.
 
  Caa: Bonds which are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal
or interest.
 
  Ca: Bonds which are rated Ca represent obligations which are speculative in
a high degree. Such issues are often in default or have other marked
shortcomings.
 
                                                 August 1, 1998 Prospectus  B-1
<PAGE>
 
  C: Bonds which are rated C are the lowest rated class of bonds and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.
 
  Moody's applies numerical modifiers, 1, 2, and 3 in each generic rating
classified from Aa through B in its corporate bond rating system. The modifier
1 indicates that the security ranks in the higher end of its generic rating
category; the modifier 2 indicates a mid-range ranking; and the modifier 3
indicates that the issue ranks in the lower end of its generic rating
category.
 
 CORPORATE SHORT-TERM DEBT RATINGS
 
  Moody's short-term debt ratings are opinions of the ability of issuers to
repay punctually senior debt obligations which have an original maturity not
exceeding one year. Obligations relying upon support mechanisms such as
letters of credit and bonds of indemnity are excluded unless explicitly rated.
 
  Moody's employs the following three designations, all judged to be
investment grade, to indicate the relative repayment ability of rated issuers:
 
  PRIME-1: Issuers rated Prime-1 (or supporting institutions) have a superior
ability for repayment of senior short-term debt obligations. Prime-1 repayment
ability will often be evidenced by many of the following characteristics:
leading market positions in well-established industries; high rates of return
on funds employed; conservative capitalization structure with moderate
reliance on debt and ample asset protection; broad margins in earnings
coverage of fixed financial charges and high internal cash generation; and
well-established access to a range of financial markets and assured sources of
alternate liquidity.
 
  PRIME-2: Issuers rated Prime-2 (or supporting institutions) have a strong
ability for repayment of senior short-term debt obligations. This will
normally be evidenced by many of the characteristics cited above but to a
lesser degree. Earnings trends and coverage ratios, while sound, may be more
subject to variation. Capitalization characteristics, while still appropriate,
may be more affected by external conditions. Ample alternate liquidity is
maintained.
 
  PRIME-3: Issuers rated Prime-3 (or supporting institutions) have an
acceptable ability for repayment of senior short-term obligations. The effect
of industry characteristics and market compositions may be more pronounced.
Variability in earnings and profitability may result in changes in the level
of debt protection measurements and may require relatively high financial
leverage. Adequate alternate liquidity is maintained.
 
  NOT PRIME: Issuers rated Not Prime do not fall within any of the Prime
rating categories.
 
STANDARD & POOR'S RATINGS SERVICES
 
 CORPORATE AND MUNICIPAL BOND RATINGS
 
 Investment Grade
 
  AAA: Debt rated AAA has the highest rating assigned by S&P. Capacity to pay
interest and repay principal is extremely strong.
 
  AA: Debt rated AA has a very strong capacity to pay interest and repay
principal and differs from the highest rated issues only in small degree.
 
 
B-2  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
  A: Debt rated A has a strong capacity to pay interest and repay principal
although it is somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than debt in higher rated categories.
 
  BBB: Debt rated BBB is regarded as having an adequate capacity to pay
interest and repay principal. Whereas it normally exhibits adequate protection
parameters, adverse economic conditions, or changing circumstances are more
likely to lead to a weakened capacity to pay interest and repay principal for
debt in this category than in higher-rated categories.
 
 Speculative Grade
 
  Debt rated BB, B, CCC, CC, and C is regarded as having predominantly
speculative characteristics with respect to capacity to pay interest and repay
principal. BB indicates the least degree of speculation and C the highest.
While such debt will likely have some quality and protective characteristics,
these are outweighed by large uncertainties or major exposures to adverse
conditions.
 
  BB: Debt rated BB has less near-term vulnerability to default than other
speculative issues. However, it faces major ongoing uncertainties or exposure
to adverse business, financial, or economic conditions which could lead to
inadequate capacity to meet timely interest and principal payments. The BB
rating category is also used for debt subordinated to senior debt that is
assigned an actual or implied BBB- rating.
 
  B: Debt rated B has a greater vulnerability to default but currently has the
capacity to meet interest payments and principal repayments. Adverse business,
financial, or economic conditions will likely impair capacity or willingness
to pay interest and repay principal. The B rating category is also used for
debt subordinated to senior debt that is assigned an actual or implied BB or
BB- rating.
 
  CCC: Debt rated CCC has a currently identifiable vulnerability to default
and is dependent upon favorable business, financial, and economic conditions
to meet timely payment of interest and repayment of principal. In the event of
adverse business, financial or economic conditions, it is not likely to have
the capacity to pay interest and repay principal. The CCC rating category is
also used for debt subordinated to senior debt that is assigned an actual or
implied B or B- rating.
 
  CC: The rating CC is typically applied to debt subordinated to senior debt
that is assigned an actual or implied CCC rating.
 
  C: The rating C is typically applied to debt subordinated to senior debt
that is assigned an actual or implied CCC- debt rating. The C rating may be
used to cover a situation where a bankruptcy petition has been filed, but debt
service payments are continued.
 
  CI: The rating CI is reserved for income bonds on which no interest is being
paid.
 
  D: Debt rated D is in payment default. The D rating category is used when
interest payments or principal payments are not made on the date due even if
the applicable grace period has not expired, unless S&P believes that such
payments will be made during such grace period. The D rating will also be used
upon the filing of a bankruptcy petition if debt service payments are
jeopardized.
 
  Plus (+) or Minus (-): The ratings from AA to CCC may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
 
                                                 August 1, 1998 Prospectus  B-3
<PAGE>
 
  Provisional ratings: The letter "p" indicates that the rating is
provisional. A provisional rating assumes the successful completion of the
project being financed by the debt being rated and indicates that payment of
debt service requirements is largely or entirely dependent upon the successful
and timely completion of the project. This rating, however, while addressing
credit quality subsequent to completion of the project, makes no comment on
the likelihood of, or the risk of default upon failure of, such completion.
The investor should exercise his own judgment with respect to such likelihood
and risk.
 
  r: The "r" is attached to highlight derivative, hybrid, and certain other
obligations that S&P believes may experience high volatility or high
variability in expected returns due to non-credit risks. Examples of such
obligations are: securities whose principal or interest return is indexed to
equities, commodities, or currencies; certain swaps and options; and interest
only and principal only mortgage securities.
 
  The absence of an "r" symbol should not be taken as an indication that an
obligation will exhibit no volatility or variability in total return.
 
  N.R.: Not rated.
 
  Debt obligations of issuers outside the United States and its territories
are rated on the same basis as domestic corporate and municipal issues. The
ratings measure the creditworthiness of the obligor but do not take into
account currency exchange and related uncertainties.
 
 COMMERCIAL PAPER RATING DEFINITIONS
 
  An S&P commercial paper rating is a current assessment of the likelihood of
timely payment of debt having an original maturity of no more than 365 days.
Ratings are graded into several categories, ranging from A for the highest
quality obligations to D for the lowest. These categories are as follows:
 
  A-1: This highest category indicates that the degree of safety regarding
timely payment is strong. Those issues determined to possess extremely strong
safety characteristics are denoted with a plus sign (+) designation.
 
  A-2: Capacity for timely payment on issues with this designation is
satisfactory. However, the relative degree of safety is not as high as for
issues designated A-1.
 
  A-3: Issues carrying this designation have adequate capacity for timely
payment. They are, however, more vulnerable to the adverse effects of changes
in circumstances than obligations carrying the higher designations.
 
  B: Issues rated B are regarded as having only speculative capacity for
timely payment.
 
  C: This rating is assigned to short-term debt obligations with a doubtful
capacity for payment.
 
  D: Debt rated D is in payment default. The D rating category is used when
interest payments or principal payments are not made on the date due, even if
the applicable grace period has not expired, unless S&P believes that such
payments will be made during such grace period.
 
  A commercial paper rating is not a recommendation to purchase, sell or hold
a security inasmuch as it does not comment as to market price or suitability
for a particular investor. The ratings are based on current information
furnished to S&P by the issuer or obtained from other sources it considers
reliable. S&P does not perform an audit in connection with any rating and may,
on occasion, rely on unaudited financial information. The ratings may be
changed, suspended, or withdrawn as a result of changes in or unavailability
of such information.
 
 
B-4  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
FOR MORE INFORMATION

Two documents are available that offer further information on the Funds of 
PIMCO Funds: Pacific Investment Management Series.

ANNUAL/SEMI-ANNUAL REPORTS TO SHAREHOLDERS  The Trust's annual reports include a
discussion of the market conditions and investment strategies that significantly
affected the Funds' performance during its last fiscal year.

STATEMENT OF ADDITIONAL INFORMATION (SAI)  The SAI contains additional 
information about the Funds. A current SAI has been filed with the Securities 
and Exchange Commission, and is incorporated into this prospectus by reference. 

To request a free copy of these documents or to make inquiries about the Funds, 
please write or call:

PIMCO Funds: Pacific Investment Management Series
840 Newport Center Drive Suite 300
Newport Beach, CA 92660

Telephone:
(800)927-4648
(800)987-4626 (PIMCO Infolink Audio Response Network)

Information about the Trust (including the SAI) can be reviewed and copied at 
the Securities and Exchange Commission's Public Reference Room in Washington,
D.C. Information on the operation of the public reference room may be obtained
by calling the Commission at 1-800-SEC-0330. Reports and other information about
the Trust are available on the Commission's Internet site at www.sec.gov, and
copies of that information may be obtained, upon payment of a duplicating fee,
by writing the Public Reference Section of the Commission, Washington, D.C.
20549-6009.


SEC File Number 811-5028


[LOGO OF PIMCO FUNDS]

PIMCO Funds
840 Newport Center Drive
Suite 300
Newport Beach, CA 92660
www.pimco.com
<PAGE>
 
                            PIMCO Funds Prospectus

Pacific             SHORT-TERM BOND FUNDS
Investment          Money Market Fund
Management          Short-Term Fund                 
Series:  Class      Low Duration Fund   
A, B, C Shares      

August 1, 1998      INTERMEDIATE-TERM BOND FUNDS
                    Real Return Bond Fund
                    Total Return Fund
                    High Yield Fund

                    LONG-TERM BOND FUNDS
                    Municipal Bond Fund
                    Long-Term U.S. Government Fund

                    INTERNATIONAL BOND FUNDS
                    Global Bond Fund II
                    Foreign Bond Fund
                    Emerging Markets Bond Fund

                    STOCK FUNDS
                    StocksPLUS Fund

                                                                   P  I  M  C  O
                                                                       F U N D S


<PAGE>
 
            PIMCO Funds: Pacific Investment Management Series
            Prospectus
               
            August 1, 1998     
               
            PIMCO Funds (the "Trust") is an open-end series management invest-
            ment company offering twelve separate investment portfolios (each
            a "Fund") in this Prospectus, each with different investment ob-
            jectives and strategies. The Trust is designed to provide access
            to the professional investment management services offered by Pa-
            cific Investment Management Company ("Pacific Investment Manage-
            ment"), which serves as investment adviser (the "Adviser") to the
            Funds. The address of PIMCO Funds is 840 Newport Center Drive,
            Suite 300, Newport Beach, CA 92660.     
 
            Each Fund offers three classes of shares in this Prospectus: Class
            A shares (generally sold subject to an initial sales charge),
            Class B shares (sold subject to a contingent deferred sales
            charge) and Class C shares (sold subject to an asset based sales
            charge). Through separate prospectuses, certain Funds and other
            series of the Trust may offer up to three additional classes of
            shares, Class D, Institutional Class and Administrative Class
            shares. See "Alternative Purchase Arrangements."
 
            This Prospectus concisely describes the information investors
            should know before investing in Class A, Class B or Class C shares
            of the Funds. Please read this Prospectus carefully and keep it
            for further reference. Information about the investment objective
            of each Fund, along with a detailed description of the types of
            securities in which each Fund may invest and of investment poli-
            cies and restrictions applicable to each Fund, are set forth in
            this Prospectus. There can be no assurance that the investment ob-
            jective of any Fund will be achieved. Because the market value of
            each Fund's investments will change, the investment returns and
            net asset value per share of each Fund will vary.
               
            A Statement of Additional Information, dated August 1, 1998, as
            amended or supplemented from time to time, is available free of
            charge by writing to PIMCO Funds Distributors LLC (the "Distribu-
            tor"), 2187 Atlantic Street, Stamford, Connecticut 06902, or by
            telephoning 800-426-0107. The Statement of Additional Information,
            which contains more detailed information about the Trust, has been
            filed with the Securities and Exchange Commission and is incorpo-
            rated by reference in this Prospectus. The Securities and Exchange
            Commission maintains an Internet World Wide Web site (at
            www.sec.gov) which contains the Statement of Additional Informa-
            tion, materials that are incorporated by reference into this Pro-
            spectus and the Statement of Additional Information, and other in-
            formation about the Funds.     
 
            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SE-
            CURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMIS-
            SION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
            SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
            PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OF-
            FENSE.
 
            SHARES OF THE FUNDS ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARAN-
            TEED OR ENDORSED BY, ANY FINANCIAL INSTITUTION, AND THE SHARES ARE
            NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORA-
            TION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY, AND ENTAIL
            RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
            INVESTMENT IN THE MONEY MARKET FUND (OR IN ANY OTHER FUND) IS NEI-
            THER INSURED NOR GUARANTEED BY THE U.S. GOVERNMENT. THERE CAN BE
            NO ASSURANCE THAT THE MONEY MARKET FUND WILL BE ABLE TO MAINTAIN A
            STABLE NET ASSET VALUE OF $1.00 PER SHARE.
 
            EACH OF THE FUNDS, EXCEPT THE MONEY MARKET FUND AND THE MUNICIPAL
            BOND FUND, MAY INVEST ALL OF ITS ASSETS IN DERIVATIVE INSTRUMENTS,
            SOME OF WHICH MAY BE PARTICULARLY SENSITIVE TO CHANGES IN PREVAIL-
            ING INTEREST RATES. UNEXPECTED CHANGES IN INTEREST RATES MAY AD-
            VERSELY AFFECT THE VALUE OF A FUND'S INVESTMENTS IN PARTICULAR DE-
            RIVATIVE INSTRUMENTS.
 
            THE HIGH YIELD AND EMERGING MARKETS BOND FUNDS MAY INVEST ALL OF
            THEIR ASSETS IN JUNK BONDS, WHICH ARE SUBJECT TO HIGH RISK, AND
            SPECULATIVE WITH REGARD TO PAYMENT OF INTEREST AND RETURN OF PRIN-
            CIPAL. INVESTORS SHOULD CAREFULLY CONSIDER THESE RISKS BEFORE IN-
            VESTING IN THE HIGH YIELD FUND. SEE "CHARACTERISTICS AND RISKS OF
            SECURITIES AND INVESTMENT TECHNIQUES--HIGH YIELD SECURITIES ("JUNK
            BONDS")."
 
 
              TABLE OF CONTENTS
 
<TABLE>   
<S>                            <C>
PIMCO Funds Overview..........   3
Financial Highlights..........   8
Investment Objectives and
Policies......................  12
Investment Risks and
Considerations................  19
Characteristics and Risks of
 Securities
 and Investment Techniques....  20
Performance Information.......  35
How to Buy Shares.............  37
Alternative Purchase
Arrangements..................  40
Exchange Privilege............  49
</TABLE>    
<TABLE>   
<S>                                <C>
How to Redeem.....................  50
Distributor and Distribution and
Servicing Plans...................  54
How Net Asset Value Is Determined
 ..................................  57
Distributions.....................  58
Taxes.............................  58
Management of the Trust...........  60
Description of the Trust..........  63
Mailings to Shareholders..........  64
Appendix A--Description of
Duration..........................  65
Appendix B--Description of
Securities Ratings................  66
</TABLE>    
 PIMCO Funds: Pacific Investment Management Series
2
<PAGE>
 
 
            PIMCO Funds Overview
               
            Pacific Investment Management, a subsidiary partnership of PIMCO
            Advisors L.P., is the investment adviser of all the Funds. Pacific
            Investment Management is one of the premier fixed income invest-
            ment management firms in the U.S. As of June 30, 1998, Pacific In-
            vestment Management had approximately $138 billion in assets under
            management. Pacific Investment Management invests in all sectors
            of the fixed income market, using its total return philosophy--
            seeking capital appreciation as well as yield.     

FUND
PROFILES
 
<TABLE>   
<CAPTION>
                            PIMCO                     PRIMARY
                            FUND NAME                 OBJECTIVE                              DURATION          CREDIT QUALITY(/1/)
              ---------------------------------------------------------------------------------------------------------
           <S>              <C>                       <C>                                    <C>               <C>
           SHORT-TERM BOND
            FUNDS           Money Market              Maximum current income, consistent     * 90 days dollar- Min 95% Aaa or
                                                      with preservation of capital and       weighted average  Prime 1; * 5% Aa
                                                      daily liquidity                        maturity          or Prime 2
                            ---------------------------------------------------------------------------------
                            Short-Term                Maximum current income, consistent     0-1 year          B to Aaa; max
                                                      with preservation of capital and                         10% below Baa
                                                      daily liquidity
                            ---------------------------------------------------------------------------------
                            Low Duration              Maximum total return consistent        1-3 years         B to Aaa; max-
                                                      with preservation of real capital                        10% below Baa
                                                      and prudent investment management
              ---------------------------------------------------------------------------------------------------------
           INTERMEDIATE-    Real Return Bond          Maximum real return, consistent        Not applicable,   B to Aaa; max
           TERM                                       with preservation of real capital      but see Fund      10% below Baa
           BOND FUNDS
                                                      and prudent investment management      description
                            ---------------------------------------------------------------------------------
                            Total Return              Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                                                      and prudent investment management
                            ---------------------------------------------------------------------------------
                            High Yield                Maximum total return, consistent       2-6 years         B to Aaa; min
                                                      with preservation of capital                             65% below Baa
                                                      and prudent investment management
              ---------------------------------------------------------------------------------------------------------
           LONG-TERM BOND
            FUNDS           Municipal Bond            High current income exempt from        3-10 years        Ba to Aaa; max
                                                      federal income tax, consistent with                      10% below Baa
                                                      preservation of capital
                            ---------------------------------------------------------------------------------
                            Long-Term U.S. Government Maximum total return, consistent       18 years          A to Aaa
                                                      with preservation of capital
                                                      and prudent investment management
              ---------------------------------------------------------------------------------------------------------
           INTERNATIONAL    Global Bond II            Maximum total return, consistent       3-6 years         B to Aaa; max
           BOND FUNDS                                 with preservation of capital                             10% below Baa
                                                      (U.S. and non-U.S.)
                            ---------------------------------------------------------------------------------
                            Foreign Bond              Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                                                      and prudent investment management
                                                      (non-U.S.)
                            ---------------------------------------------------------------------------------
                            Emerging Markets Bond     Maximum total return, consistent       0-8 years         B to Aaa
                                                      with preservation of capital
                                                      and prudent investment management
                                                      (non-U.S.)
              ---------------------------------------------------------------------------------------------------------
           STOCK FUND       StocksPLUS(/2/)           Total return which exceeds that of the 0-1 year          B to Aaa; max
                                                      S&P 500                                                  10% below Baa
</TABLE>    
            * = Denotes greater than or equal to.

            1. As rated by Moody's Investors Service, Inc., or if unrated, de-
            termined to be of comparable quality. For specific information
            concerning the credit quality of the securities in each Fund's
            portfolio, see "Investment Objectives and Policies."

            2. The StocksPLUS Fund may invest all of its assets in stock index
            futures backed by short-term bonds.
                                                     August 1, 1998 Prospectus
                                                                               3
<PAGE>
 
 
SHAREHOLDER
TRANSACTION
EXPENSES
 
 
<TABLE>
<CAPTION>
                                   CLASS A     CLASS B     CLASS C
                                   SHARES      SHARES      SHARES
              -------------------------------------------------------
       <S>                         <C>         <C>         <C>
       MAXIMUM INITIAL SALES
        CHARGE IMPOSED ON
        PURCHASES
        (as a percentage of
        offering price at time
        of purchase)
         TOTAL RETURN, HIGH
          YIELD, LONG-TERM U.S.
          GOVERNMENT, GLOBAL
          BOND II, FOREIGN BOND
          AND EMERGING MARKETS
          BOND FUNDS                4.50%       None        None
         LOW DURATION, REAL
          RETURN BOND, MUNICIPAL
          BOND AND STOCKSPLUS
          FUNDS                     3.00%       None        None
         SHORT-TERM FUND            2.00%       None        None
         MONEY MARKET FUND           None(/1/)  None        None
              -------------------------------------------------------
       MAXIMUM SALES CHARGE
        IMPOSED ON REINVESTED
        DIVIDENDS
        (as a percentage of net
        asset value at time of
        purchase)                    None       None        None
              -------------------------------------------------------
       MAXIMUM CONTINGENT
        DEFERRED SALES CHARGE
        ("CDSC")
        (as a percentage of
        original purchase price)       1%(/2/)    5%(/3/)     1%(/4/)
              -------------------------------------------------------
       EXCHANGE FEE                  None(/1/)  None        None
</TABLE>
 
 
            1. Regular sales charges apply when Class A shares of the Money
            Market Fund (on which no sales charge was paid at time of pur-
            chase) are exchanged for shares of any other Fund.
            2. Imposed only in certain circumstances where Class A shares are
            purchased without a front-end sales charge at the time of pur-
            chase. See "Alternative Purchase Arrangements" in this Prospectus.
            3. The maximum CDSC is imposed on shares redeemed in the first
            year. For shares held longer than one year, the CDSC declines ac-
            cording to the schedule set forth under "Alternative Purchase Ar-
            rangements--Deferred Sales Charge Alternative--Class B Shares" in
            this Prospectus.
            4. The CDSC on Class C shares is imposed only on shares redeemed
            in the first year.
 
 
<TABLE>
<CAPTION>
                                                                            EXAMPLE: You would EXAMPLE: You would
                                                                            pay the            pay the
                                                                            following expenses
                                                                            on a $1,000        following expenses
                                                                            investment         on a $1,000
                                                                            assuming (1) 5%    investment
                                                                            annual return and  assuming (1) 5%
                                                                            (2) redemption at  annual return and
                                  ANNUAL FUND OPERATING EXPENSES            the end of each    (2) no redemption:
                                  (As a percentage of average net assets):  time period:
                                                                 TOTAL
                                            ADMINI-              FUND
                                  ADVISORY  STRATIVE  12B-1      OPERATING  YEAR               YEAR
           FUND                   FEE       FEE       FEES(/1/)  EXPENSES   1    3   5    10   1    3   5    10
              ---------------------------------------------------------------------------------------------------
           <S>                    <C>       <C>       <C>        <C>        <C>  <C> <C>  <C>  <C>  <C> <C>  <C>
           MONEY MARKET           .15%      .35%      .10%(/2/)   .60%(/3/) $ 6  $19 $ 33 $ 75 $ 6  $19 $ 33 $ 75
              ---------------------------------------------------------------------------------------------------
           SHORT-TERM             .25       .35       .25         .85        29   47   66  123  29   47   66  123
              ---------------------------------------------------------------------------------------------------
           LOW DURATION           .25       .40       .25         .90        39   58   78  137  39   58   78  137
              ---------------------------------------------------------------------------------------------------
           REAL RETURN BOND       .25       ,40       .25         .90        39   58   78  137  39   58   78  137
              ---------------------------------------------------------------------------------------------------
           TOTAL RETURN           .25       .40       .25         .90        54   72   93  151  54   72   93  151
              ---------------------------------------------------------------------------------------------------
           HIGH YIELD             .25       .40       .25         .90        54   72   93  151  54   72   93  151
              ---------------------------------------------------------------------------------------------------
           MUNICIPAL BOND         .25       .35       .25         .85        38   56  N/A  N/A  38   56  N/A  N/A
              ---------------------------------------------------------------------------------------------------
           LONG-TERM U.S.
           GOVERNMENT             .25       .40       .25         .90        54   72   93  151  54   72   93  151
              ---------------------------------------------------------------------------------------------------
           GLOBAL BOND II         .25       .45       .25         .95        54   74   95  156  54   74   95  156
              ---------------------------------------------------------------------------------------------------
           FOREIGN BOND           .25       .45       .25         .95        54   74   95  156  54   74   95  156
              ---------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND  .45       .55       .25        1.25        57   83  111  189  57   83  111  189
              ---------------------------------------------------------------------------------------------------
           STOCKSPLUS             .40       .40       .25        1.05        40   62   86  154  40   62   86  154
              ---------------------------------------------------------------------------------------------------
</TABLE>
 
 
CLASS A
SHARES
 
            1. 12b-1 fees represent servicing fees which are paid to the Dis-
            tributor and repaid to participating brokers, certain banks and
            other financial intermediaries. See "Distributor and Distribution
            and Servicing Plans."
            2. The Distributor has voluntarily undertaken to reduce the 12b-1
            fee it receives with respect to the Money Market Fund to .10% of
            the Fund's average daily net assets until further notice. Absent
            such undertaking, the 12b-1 fee would be .20% of the Fund's aver-
            age daily net assets.
            3. Absent the undertaking noted, the "Total Fund Operating Ex-
            penses" for the Money Market Fund would be .70% of the Fund's av-
            erage daily net assets.
 
 PIMCO Funds: Pacific Investment Management Series
4
<PAGE>
 
 
 
<TABLE>
<CAPTION>
                                                                                EXAMPLE: You would EXAMPLE: You would
                                                                                pay the following  pay the following
                                                                                expenses on a      expenses on a
                                                                                $1,000 investment  $1,000 investment
                                                                                assuming (1) 5%    assuming (1) 5%
                                                                                annual return and  annual return and
                                                                                (2) redemption at  (2) no redemption:
                                  ANNUAL FUND OPERATING EXPENSES                the end of each
                                  (As a percentage of average net assets):      time period:
                                                                    TOTAL
                                             ADMINI-                FUND
                                  ADVISORY   STRATIVE   12B-1       OPERATING   YEAR               YEAR
           FUND                   FEE        FEE        FEES(/1/)   EXPENSES    1    3   5    10   1    3   5    10
              -------------------------------------------------------------------------------------------------------
           <S>                    <C>        <C>        <C>         <C>         <C>  <C> <C>  <C>  <C>  <C> <C>  <C>
           MONEY MARKET                 .15%       .35%       1.00%       1.50% $65  $77 $102 $143 $15  $47 $ 82 $143
              -------------------------------------------------------------------------------------------------------
           SHORT-TERM                   .25        .35        1.00        1.60   66   80  107  160  16   50   87  160
              -------------------------------------------------------------------------------------------------------
           LOW DURATION                 .25        .40        1.00        1.65   67   82  110  166  17   52   90  166
CLASS B       -------------------------------------------------------------------------------------------------------
SHARES     REAL RETURN BOND             .25        .40        1.00        1.65   67   82  110  166  17   52   90  166
              -------------------------------------------------------------------------------------------------------
           TOTAL RETURN                 .25        .40        1.00        1.65   67   82  110  166  17   52   90  166
              -------------------------------------------------------------------------------------------------------
           HIGH YIELD                   .25        .40        1.00        1.65   67   82  110  166  17   52   90  166
              -------------------------------------------------------------------------------------------------------
           MUNICIPAL BOND               .25        .35        1.00        1.60   66   80  N/A  N/A  16   50  N/A  N/A
              -------------------------------------------------------------------------------------------------------
           LONG-TERM U.S.
           GOVERNMENT                   .25        .40        1.00        1.65   67   82  110  166  17   52   90  166
              -------------------------------------------------------------------------------------------------------
           GLOBAL BOND II               .25        .45        1.00        1.70   67   84  112  171  17   54   92  171
              -------------------------------------------------------------------------------------------------------
           FOREIGN BOND                 .25        .45        1.00        1.70   67   84  112  171  17   54   92  171
              -------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND        .45        .55        1.00        2.00   70   93  128  204  20   63  108  204
              -------------------------------------------------------------------------------------------------------
           STOCKSPLUS                   .40        .40        1.00        1.80   68   87  117  182  18   57   97  182
              -------------------------------------------------------------------------------------------------------
</TABLE>
            1. 12b-1 fees which equal or are less than .25% represent servic-
            ing fees which are paid to the Distributor and repaid to partici-
            pating brokers, certain banks and other financial intermediaries.
            12b-1 fees which exceed .25% represent aggregate distribution and
            servicing fees. See "Distributor and Distribution and Servicing
            Plans."
                                                     August 1, 1998 Prospectus
                                                                               5
<PAGE>
 
CLASS C
SHARES
 
 
<TABLE>
<CAPTION>
                                                                                                             EXAMPLE: You
                                                                                          EXAMPLE: You would would pay the
                                                                                          pay the following  following
                                                                                          expenses on a      expenses on a
                                                                                          $1,000 investment  $1,000 investment
                                                                                          assuming (1) 5%    assuming (1) 5%
                                                                                          annual return and  annual return and
                                                                                          (2) redemption at  (2) no
                                  ANNUAL FUND OPERATING EXPENSES                          the end of each    redemption:
                                  (As a percentage of average net assets):                time period:
                                                                         TOTAL
                                             ADMINI-                     FUND
                                  ADVISORY   STRATIVE   12B-1            OPERATING        YEAR               YEAR
           FUND                   FEE        FEE        FEES(/1/)        EXPENSES         1    3   5    10   1    3   5   10
              ---------------------------------------------------------------------------------------------------------
           <S>                    <C>        <C>        <C>              <C>              <C>  <C> <C>  <C>  <C>  <C> <C> <C>
           MONEY MARKET                 .15%       .35%        .10(/2/)%        .60(/3/)% $16  $19 $ 33 $ 75 $ 6  $19 $33 $ 75
              ---------------------------------------------------------------------------------------------------------
           SHORT-TERM                   .25        .35         .55(/2/)        1.15(/3/)   22   37   63  140  12   37  63  140
              ---------------------------------------------------------------------------------------------------------
           LOW DURATION                 .25        .40         .75             1.40        24   44   77  168  14   44  77  168
              ---------------------------------------------------------------------------------------------------------
           REAL RETURN BOND             .25        .40         .75(/2/)        1.40(/3/)   24   44   77  168  14   44  77  168
              ---------------------------------------------------------------------------------------------------------
           TOTAL RETURN                 .25        .40        1.00             1.65        27   52   90  195  17   52  90  195
              ---------------------------------------------------------------------------------------------------------
           HIGH YIELD                   .25        .40        1.00             1.65        27   52   90  195  17   52  90  195
              ---------------------------------------------------------------------------------------------------------
           MUNICIPAL BOND               .25        .35         .75(/2/)        1.35(/3/)   24   43  N/A  N/A  14   43 N/A  N/A
              ---------------------------------------------------------------------------------------------------------
           LONG-TERM U.S.
           GOVERNMENT                   .25        .40        1.00             1.65        27   52   90  195  17   52  90  195
              ---------------------------------------------------------------------------------------------------------
           GLOBAL BOND II               .25        .45        1.00             1.70        27   54   92  201  17   54  92  201
              ---------------------------------------------------------------------------------------------------------
           FOREIGN BOND                 .25        .45        1.00             1.70        27   54   92  201  17   54  92  201
              ---------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND        .45        .55        1.00             2.00        30   63  108  233  20   63 108  233
              ---------------------------------------------------------------------------------------------------------
           STOCKSPLUS                   .40        .40         .75(/2/)        1.55(/3/)   26   49   84  185  16   49  84  185
              ---------------------------------------------------------------------------------------------------------
</TABLE>
 
            1. 12b-1 fees which equal or are less than .25% represent servic-
            ing fees which are paid to the Distributor and repaid to partici-
            pating brokers, certain banks and other financial intermediaries.
            12b-1 fees which exceed .25% represent aggregate distribution and
            servicing fees. See "Distributor and Distribution and Servicing
            Plans."
            2. The Distributor has voluntarily undertaken to reduce the 12b-1
            fee it may receive with respect to each of the Money Market,
            Short-Term, Real Return Bond, Municipal Bond and StocksPLUS Funds
            to the following annual rates based on the Fund's average daily
            net assets until further notice: Money Market--.10%; Short-Term--
            .55%; Real Return Bond--.75%; Municipal Bond--.75%; and
            StocksPLUS--.75%. Absent such undertakings, the 12b-1 fee for each
            such Fund would be as follows: Money Market--.20%; Short-Term--
            1.00%; Real Return Bond--1.00%; Municipal Bond--1.00%; and
            StocksPLUS--1.00%.
            3. Absent the undertakings noted, the "Total Fund Operating Ex-
            penses" for the Money Market, Short-Term, Real Return Bond, Munic-
            ipal Bond and StocksPLUS Funds would be as follows (based on aver-
            age daily net assets): Money Market--.70%; Short-Term--1.60%; Real
            Return Bond--1.65%; Municipal Bond--1.60%; and StocksPLUS--1.80%.
 
            The purpose of the foregoing tables is to assist investors in un-
            derstanding the various costs and expenses of the Trust that are
            borne directly or indirectly by Class A, Class B and Class C
            shareholders of the Funds. The information is based upon each
            Funds' current fees and expenses. The Examples for Class A shares
            assume payment of the current maximum applicable sales load. Due
            to the 12b-1 distribution fee imposed on Class B and Class C
            shares, a Class B or Class C shareholder of the Trust may, depend-
            ing on the length of time the shares are held, pay more than the
            economic equivalent of the maximum front-end sales charges permit-
            ted by relevant rules of the National Association of Securities
            Dealers, Inc.
 
            NOTE: THE FIGURES SHOWN IN THE EXAMPLES ARE ENTIRELY HYPOTHETICAL.
            THEY ARE NOT REPRESENTATIONS OF PAST OR FUTURE PERFORMANCE OR EX-
            PENSES; ACTUAL PERFORMANCE AND/OR EXPENSES MAY BE MORE OR LESS
            THAN SHOWN.
 PIMCO Funds: Pacific Investment Management Series
6
<PAGE>
 
                      (This page left blank intentionally)
                                                     August 1, 1998 Prospectus
                                                                               7
<PAGE>
 
 
Financial Highlights
   
The following information regarding selected per share data and ratios for
shares of certain of the Funds is part of the Trust's audited financial state-
ments, which are included in the Trust's Annual Report dated March 31, 1998,
which is incorporated by reference in the Statement of Additional Information.
The Trust's audited financial statements and selected per share data and ratios
appearing below have been examined by PricewaterhouseCoopers LLP (formerly
Price Waterhouse LLP) independent accountants, whose opinion thereon is also
included in the Annual Report, which may be obtained without charge. Informa-
tion is presented for each Fund described herein which had investment opera-
tions during the reporting periods. Information regarding the Global Bond Fund
II reflects the operational history of the Global Income Fund, a former series
of PIMCO Advisors Funds that was reorganized as a series of the Trust on Janu-
ary 17, 1997.     
 
Selected data for a share outstanding throughout each period:
 
<TABLE>   
<CAPTION>
                 NET ASSET              NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS DISTRIBUTIONS
        YEAR OR    VALUE      NET      AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    IN EXCESS OF
         PERIOD  BEGINNING INVESTMENT  GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    NET REALIZED
         ENDED   OF PERIOD   INCOME     INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS CAPITAL GAINS
- -----------------------------------------------------------------------------------------------------------------------
<S>              <C>       <C>         <C>            <C>          <C>        <C>           <C>           <C>
MONEY MARKET FUND
 Class A
 03/31/98         $ 1.00     $0.05(+)      $ 0.00 (+)    $0.05       $(0.05)     $ 0.00        $ 0.00        $ 0.00
 03/31/97(a)        1.00      0.01           0.00         0.01        (0.01)       0.00          0.00          0.00
 Class B
 03/31/98           1.00      0.04(+)        0.00 (+)     0.04        (0.04)       0.00          0.00          0.00
 03/31/97(a)        1.00      0.01           0.00         0.01        (0.01)       0.00          0.00          0.00
 Class C
 03/31/98           1.00      0.05(+)        0.00 (+)     0.05        (0.05)       0.00          0.00          0.00
 03/31/96(a)        1.00      0.01           0.00         0.01        (0.01)       0.00          0.00          0.00
SHORT-TERM FUND
 Class A
 03/31/98         $10.00     $0.55(+)      $ 0.09 (+)    $0.64       $(0.56)     $(0.01)       $ 0.00        $ 0.00
 03/31/97(b)       10.04      0.10          (0.03)        0.07        (0.10)      (0.01)         0.00          0.00
 Class B
 03/31/98          10.00      0.50(+)        0.08 (+)     0.58        (0.50)      (0.01)         0.00          0.00
 03/31/97(b)       10.04      0.09          (0.03)        0.06        (0.10)       0.00          0.00          0.00
 Class C
 03/31/98          10.00      0.54(+)        0.07 (+)     0.61        (0.53)      (0.01)         0.00          0.00
 03/31/97(b)       10.04      0.09          (0.03)        0.06        (0.10)       0.00          0.00          0.00
LOW DURATION FUND
 Class A
 03/31/98         $ 9.98     $0.60(+)      $ 0.23 (+)    $0.83       $(0.58)     $(0.02)       $(0.03)       $ 0.00
 03/31/97(a)       10.02      0.12          (0.03)        0.09        (0.12)      (0.01)         0.00          0.00
 Class B
 03/31/98           9.98      0.53(+)        0.22 (+)     0.75        (0.50)      (0.02)        (0.03)         0.00
 03/31/97(a)       10.02      0.10          (0.03)        0.07        (0.11)       0.00          0.00          0.00
 Class C
 03/31/98           9.98      0.55(+)        0.23 (+)     0.78        (0.53)      (0.02)        (0.03)         0.00
 03/31/97(a)       10.02      0.11          (0.03)        0.08        (0.11)      (0.01)         0.00          0.00
HIGH YIELD FUND
 Class A
 03/31/98         $11.10     $0.93(+)      $ 0.66 (+)    $1.59       $(0.94)     $ 0.00        $ 0.00        $(0.09)
 03/31/97(a)       11.18      0.17          (0.05)        0.12        (0.20)       0.00          0.00          0.00
 Class B
 03/31/98          11.10      0.84(+)        0.66 (+)     1.50        (0.85)       0.00          0.00         (0.09)
 03/31/97(a)       11.18      0.15          (0.05)        0.10        (0.18)       0.00          0.00          0.00
 Class C
 03/31/98          11.10      0.85(+)        0.65 (+)     1.50        (0.85)       0.00          0.00         (0.09)
 03/31/97(a)       11.18      0.15          (0.05)        0.10        (0.18)       0.00          0.00          0.00
</TABLE>    
- -------
(+)Per share amounts based on average number of shares outstanding during the
period.
       
(a)From commencement of operations, January 13, 1997.
          
(b)From commencement of operations, January 20, 1997.     
       
 PIMCO Funds: Pacific Investment Management Series
8
<PAGE>
 
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
<TABLE>   
<CAPTION>
                                                                   RATIO OF NET
                          NET ASSET         NET ASSETS  RATIO OF    INVESTMENT
TAX BASIS                   VALUE              END     EXPENSES TO  INCOME TO   PORTFOLIO
  RETURN        TOTAL        END    TOTAL   OF PERIOD    AVERAGE     AVERAGE    TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN   (000'S)   NET ASSETS   NET ASSETS    RATE
- -----------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>     <C>        <C>         <C>          <C>
  $0.00        $ (0.05)    $ 1.00    5.10%   $ 41,375     0.60%        5.02%       N/A
   0.00          (0.01)      1.00    1.01      43,589     0.57+        4.44+       N/A
   0.00          (0.04)      1.00    4.21       2,937     1.50         4.15        N/A
   0.00          (0.01)      1.00    0.83       3,143     1.41+        3.62+       N/A
   0.00          (0.05)      1.00    5.14      55,696     0.60         5.05        N/A
   0.00          (0.01)      1.00    1.02      85,398     0.58+        4.47+       N/A
  $0.00        $ (0.58)    $10.06    6.64%   $ 24,182     0.85%        5.48%        48%
   0.00          (0.11)     10.00    0.66       2,533     0.86+        5.07+        77
   0.00          (0.52)     10.06    5.96       1,258     1.60         4.97         48
   0.00          (0.10)     10.00    0.58         114     1.62+        4.83+        77
   0.00          (0.55)     10.06    6.33       6,763     1.15         5.33         48
   0.00          (0.10)     10.00    0.63       1,359     1.14+        4.78+        77
  $0.00         $(0.63)    $10.18    8.49%   $109,531     0.90%        5.93%       309%
   0.00          (0.13)      9.98    0.85      59,348     0.91+        5.84+       240
   0.00          (0.55)     10.18    7.68      17,624     1.65         5.16        309
   0.00          (0.11)      9.98    0.68       5,296     1.67+        5.03+       240
   0.00          (0.58)     10.18    8.01      68,766     1.40         5.46        309
   0.00          (0.12)      9.98    0.75      63,606     1.42+        5.36+       240
  $0.00        $()1.03)    $11.66   14.80%   $ 70,858     0.90%        8.02%        37%
   0.00          (0.20)     11.10    1.06      28,873     0.92+        8.28+        67
   0.00          (0.94)     11.66   13.94     156,099     1.65         7.27         37
   0.00          (0.18)     11.10    0.86      60,269     1.67+        7.52+        67
   0.00          (0.94)     11.66   13.95     284,836     1.65         7.36         37
   0.00          (0.18)     11.10    0.88     205,297     1.68+        7.56+        67
</TABLE>    
- -------
 +Annualized.
       
                                                     August 1, 1998 Prospectus
                                                                               9
<PAGE>
 
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
<TABLE>   
<CAPTION>
                    NET ASSET               NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS DISTRIBUTIONS
        YEAR OR       VALUE      NET       AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    IN EXCESS OF
         PERIOD     BEGINNING INVESTMENT   GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    NET REALIZED
         ENDED      OF PERIOD   INCOME      INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS CAPITAL GAINS
- -------------------------------------------------------------------------------------------------------------------------------
<S>                 <C>       <C>          <C>            <C>          <C>        <C>           <C>           <C>           <C>
TOTAL RETURN FUND
 Class A
 03/31/98            $10.27     $ 0.58 (+)     $ 0.63 (+)    $ 1.21      $(0.57)     $(0.02)       $(0.27)        $0.00
 03/31/97(a)          10.40       0.12          (0.12)         0.00       (0.13)       0.00          0.00          0.00
 Class B
 03/31/98             10.27       0.50 (+)       0.63 (+)      1.13       (0.50)      (0.01)        (0.27)         0.00
 03/31/97(a)          10.40       0.11          (0.12)        (0.01)      (0.12)       0.00          0.00          0.00
 Class C
 03/31/98             10.27       0.51 (+)       0.63 (+)      1.14       (0.51)      (0.01)        (0.27)         0.00
 03/31/97(a)          10.40       0.11          (0.12)        (0.01)      (0.12)       0.00          0.00          0.00
REAL RETURN BOND FUND
 Class A
 03/31/98            $ 9.93     $ 0.40 (+)     $ 0.03 (+)    $ 0.43      $(0.42)     $(0.03)       $(0.14)        $0.00
 03/31/97(c)          10.00       0.11 (+)      (0.10)(+)      0.01       (0.08)       0.00          0.00          0.00
 Class B
 03/31/98              9.93       0.33 (+)       0.03 (+)      0.36       (0.36)      (0.02)        (0.14)         0.00
 03/31/97(c)          10.00       0.09          (0.10)        (0.01)      (0.06)       0.00          0.00          0.00
 Class C
 03/31/98              9.93       0.35 (+)       0.04 (+)      0.39       (0.38)      (0.03)        (0.14)         0.00
 03/31/97(c)          10.00       0.09          (0.10)        (0.01)      (0.06)       0.00          0.00          0.00
LONG-TERM U.S. GOVERNMENT FUND
 Class A
 03/31/98            $ 9.39     $ 0.48 (+)     $ 1.34 (+)    $ 1.82      $(0.58)     $ 0.00        $(0.06)        $0.00
 03/31/97(b)           9.67       0.32          (0.47)        (0.15)      (0.13)       0.00          0.00          0.00
 Class B
 03/31/98              9.39       0.39 (+)       1.35 (+)      1.74       (0.50)       0.00         (0.06)         0.00
 03/31/97(b)           9.67       0.29          (0.47)        (0.18)      (0.10)       0.00          0.00          0.00
 Class C
 03/31/98              9.39       0.39 (+)       1.35 (+)      1.74       (0.50)       0.00         (0.06)         0.00
 03/31/97(b)           9.67       0.29          (0.47)        (0.18)      (0.10)       0.00          0.00          0.00
FOREIGN BOND FUND
 Class A
 03/31/98            $10.41     $ 0.61 (+)     $ 0.62 (+)    $ 1.23      $(0.59)     $ 0.00        $(0.31)        $0.00
 03/31/97(b)          10.59       0.59          (0.72)        (0.13)      (0.05)       0.00          0.00          0.00
 Class B
 03/31/98             10.41       0.53 (+)       0.61 (+)      1.14       (0.50)       0.00         (0.31)         0.00
 03/31/97(b)          10.59       0.58          (0.72)        (0.14)      (0.04)       0.00          0.00          0.00
 Class C
 03/31/98             10.41       0.52 (+)       0.62 (+)      1.14       (0.50)       0.00         (0.31)         0.00
 03/31/97(b)          10.59       0.58          (0.72)        (0.14)      (0.04)       0.00          0.00          0.00
GLOBAL BOND FUND II
 Class A
 03/31/98            $10.84     $ 0.64 (+)     $ 0.51 (+)    $ 1.15      $ 0.00      $(0.54)       $(1.53)        $0.00
 10/01/96--03/31/97   10.96       0.66          (0.16)         0.50       (0.22)       0.00         (0.40)         0.00
 09/30/96(d)          10.00       0.32 (e)       0.95          1.27       (0.31)       0.00          0.00          0.00
 Class B
 03/31/98             10.84       0.66 (+)       0.41 (+)      1.07        0.00       (0.46)        (1.53)         0.00
 10/01/96--03/31/97   10.96       0.62          (0.16)         0.46       (0.18)       0.00         (0.40)         0.00
 09/30/96(d)          10.00       0.30 (e)       0.92          1.22       (0.26)       0.00          0.00          0.00
 Class C
 03/31/98             10.84       0.55 (+)       0.52 (+)      1.07        0.00       (0.46)        (1.53)         0.00
 10/01/96--03/31/97   10.96       0.62          (0.16)         0.46       (0.18)       0.00         (0.40)         0.00
 09/30/96(d)          10.00       0.30 (e)       0.92          1.22       (0.26)       0.00          0.00          0.00
EMERGING MARKETS BOND FUND
 Class A
 03/31/98(f)         $10.00     $ 0.44 (+)     $(0.18)(+)    $ 0.26      $(0.44)     $ 0.00        $(0.15)        $0.00
 Class B
 03/31/98(f)          10.00       0.40 (+)     (0.20)(+)       0.20       (0.38)       0.00         (0.15)         0.00
 Class C
 09/30/97(f)          10.00       0.38 (+)      (0.18)(+)      0.20       (0.38)       0.00         (0.15)         0.00
STOCKSPLUS FUND
 Class A
 03/31/98            $11.46     $ 1.66 (+)     $ 3.41 (+)    $ 5.07      $(1.38)     $ 0.00        $(1.09)        $0.00
 03/31/97(b)          11.91      (0.10)         (0.20)        (0.30)      (0.15)       0.00          0.00          0.00
 Class B
 03/301/98            11.44       1.61 (+)       3.35 (+)      4.96       (1.30)       0.00         (1.09)         0.00
 03/31/97(b)          11.91      (0.13)         (0.20)        (0.33)      (0.14)       0.00          0.00          0.00
 Class C
 03/31/98             11.45       1.64 (+)       3.35 (+)      4.99       (1.32)       0.00         (1.09)         0.00
 03/31/97(b)          11.91      (0.12)         (0.20)        (0.32)      (0.14)       0.00          0.00          0.00
<CAPTION>
        YEAR OR
         PERIOD
         ENDED
- -------------------------------------------------------------------------------------------------------------------------------
<S>                 <C>
TOTAL RETURN FUND
 Class A
 03/31/98
 03/31/97(a)
 Class B
 03/31/98
 03/31/97(a)
 Class C
 03/31/98
 03/31/97(a)
REAL RETURN BOND FUND
 Class A
 03/31/98
 03/31/97(c)
 Class B
 03/31/98
 03/31/97(c)
 Class C
 03/31/98
 03/31/97(c)
LONG-TERM U.S. GOVERNMENT FUND
 Class A
 03/31/98
 03/31/97(b)
 Class B
 03/31/98
 03/31/97(b)
 Class C
 03/31/98
 03/31/97(b)
FOREIGN BOND FUND
 Class A
 03/31/98
 03/31/97(b)
 Class B
 03/31/98
 03/31/97(b)
 Class C
 03/31/98
 03/31/97(b)
GLOBAL BOND FUND II
 Class A
 03/31/98
 10/01/96--03/31/97
 09/30/96(d)
 Class B
 03/31/98
 10/01/96--03/31/97
 09/30/96(d)
 Class C
 03/31/98
 10/01/96--03/31/97
 09/30/96(d)
EMERGING MARKETS BOND FUND
 Class A
 03/31/98(f)
 Class B
 03/31/98(f)
 Class C
 09/30/97(f)
STOCKSPLUS FUND
 Class A
 03/31/98
 03/31/97(b)
 Class B
 03/301/98
 03/31/97(b)
 Class C
 03/31/98
 03/31/97(b)
</TABLE>    
- -------
   
(c)From commencement of operations, January 29, 1997.     
          
(d)From commencement of operations, October 2, 1995.     
   
(e)Reflects voluntary waiver of investment advisory fee of $12,041 (.01 per
share) by the Adviser.     
   
(f)From commencement of operations, July 31, 1997.     
       
10
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
<TABLE>   
<CAPTION>
                                                                   RATIO OF NET
                          NET ASSET         NET ASSETS  RATIO OF    INVESTMENT
TAX BASIS                   VALUE              END     EXPENSES TO  INCOME TO   PORTFOLIO
  RETURN        TOTAL        END    TOTAL   OF PERIOD    AVERAGE     AVERAGE    TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN   (000'S)   NET ASSETS   NET ASSETS    RATE
- -----------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>     <C>        <C>         <C>          <C>
  $0.00        $(0.86)     $10.62   12.11%   $533,893     0.90%         5.46%       206%
   0.00         (0.13)      10.27    0.02     115,742     0.91+         6.08+       173
   0.00         (0.78)      10.62   11.26     186,932     1.65          4.74        206
   0.00         (0.12)      10.27   (0.10)     74,130     1.67+         5.28+       173
   0.00         (0.79)      10.62   11.28     405,037     1.65          4.83        206
   0.00         (0.12)      10.27   (0.11)    329,104     1.67+         5.32+       173
  $0.00        $(0.59)     $ 9.77    4.12%   $    370     0.92%         4.06%       967%
   0.00         (0.08)       9.93    0.15           1     0.90+         6.14+       160
   0.00         (0.52)       9.77    3.50       1,496     1.67          3.32        967
   0.00         (0.06)       9.93   (0.08)        509     1.59+         3.43+       160
   0.00         (0.55)       9.77    3.73         490     1.42          3.56        967
   0.00         (0.06)       9.93   (0.07)        148     1.62+         5.13+       160
  $0.00        $(0.64)     $10.57   19.78%   $  6,161     0.91%         4.49%       177%
   0.00         (0.13)       9.39   (1.72)      1,204     1.12+         6.91+       402
   0.00         (0.56)      10.57   18.85       7,516     1.66          4.64        177
   0.00         (0.10)       9.39   (1.92)        454     1.87+         4.95+       402
   0.00         (0.56)      10.57   18.86       7,258     1.66          4.64        177
   0.00         (0.10)       9.39   (1.83)        275     1.88+         5.52+       402
  $0.00        $(0.90)     $10.74   12.14%   $  9,582     0.95%         5.88%       280%
   0.00         (0.05)      10.41   (1.21)        704     0.97+         4.95+       984
   0.00         (0.81)      10.74   11.29      10,631     1.70          5.13        280
   0.00         (0.04)      10.41   (1.34)      1,221     1.75+         3.73+       984
   0.00         (0.81)      10.74   11.29      17,080     1.70          5.13        280
   0.00         (0.04)      10.41   (1.32)      1,788     1.76+         4.09+       984
  $0.00        $(2.07)     $ 9.92   11.21%   $  6,816     0.95%         5.88%       369%
   0.00         (0.62)      10.84    4.55       7,652     2.05+         5.60+       307
   0.00         (0.31)      10.96   15.01       7,360     1.27(g)       4.88(h)   1,246
   0.00         (1.99)       9.92   10.39       4,473     1.70          5.12        369
   0.00         (0.58)      10.84    4.17       3,925     2.57+         4.22+       307
   0.00         (0.26)      10.96   14.54       3,240     2.49(g)       4.09(h)   1,246
   0.00         (1.99)       9.92   10.39       6,096     1.70          5.12        369
   0.00         (0.58)      10.84    4.17       5,323     2.43+         4.14+       307
   0.00         (0.26)      10.96   14.54       3,459     2.49(g)       4.09(h)   1,246
  $0.00        $(0.59)     $ 9.67    2.84%   $    317     1.26%         6.93%       695%
   0.00         (0.53)       9.67    2.29         304     2.01          6.33        695
   0.00         (0.53)       9.67    2.29         136     2.01          6.11        695
  $0.00        $(2.47)     $14.06   47.07%   $ 62,970     1.05%        13.34%        30%
   0.00         (0.15)      11.46   (2.59)      5,790     1.10+       (10.69)+       47
   0.00         (2.39)      14.01   46.11      99,039     1.80         12.60         30
   0.00         (0.14)      11.44   (2.81)      8,281     1.88+       (15.13)+       47
   0.00         (2.41)      14.03   46.38      96,960     1.55         12.85         30
   0.00         (0.14)      11.45   (2.71)     11,254     1.65+       (12.79)+       47
</TABLE>    
- -------
 +Annualized.
          
(g)The Ratio of Expenses to Average Net Assets without the waiver would have
been 1.57%.     
   
(h)The Ratio of Net Investment Income to Average Net Assets without the waiver
would have been 4.58%.     
       
                                                     August 1, 1998 Prospectus
                                                                              11
<PAGE>
 
            Investment Objectives and Policies
               
            The investment objective and general investment policies of each
            Fund are described below. There can be no assurance that the in-
            vestment objective of any Fund will be achieved. For temporary,
            defensive or emergency purposes, a Fund may invest without limit
            in U.S. debt securities, including short-term money market securi-
            ties, when in the opinion of the Adviser it is appropriate to do
            so. It is impossible to predict for how long such alternative
            strategies will be utilized. The value of all securities and other
            instruments held by the Funds will vary from time to time in re-
            sponse to a wide variety of market factors. Consequently, the net
            asset value per share of each Fund will vary, except that the
            Money Market Fund will attempt to maintain a net asset value of
            $1.00 per share, although there can be no assurance that the Fund
            will be successful in doing so.     
               The investment objective of the Global Bond Fund II described
            in this Prospectus may be changed by the Board of Trustees without
            shareholder approval. The investment objective of each other Fund
            is fundamental and may not be changed without shareholder approval
            by vote of a majority of the outstanding shares of that Fund. If
            there is a change in a Fund's investment objective, including a
            change approved by a shareholder vote, shareholders should con-
            sider whether the Fund remains an appropriate investment in light
            of their then current financial position and needs.
               Specific portfolio securities eligible for purchase by the
            Funds, investment techniques that may be used by the Funds, and
            the risks associated with these securities and techniques are de-
            scribed more fully under "Characteristics and Risks of Securities
            and Investment Techniques" in this Prospectus and "Investment Ob-
            jectives and Policies" in the Statement of Additional Information.
 
 
FIXED       With the exception of the StocksPLUS Fund, each remaining Fund
INCOME FUND (together, the "Fixed Income Funds") differs from the others pri-
DESCRIPTIONSmarily in the length of the Fund's duration or the proportion of
            its investments in certain types of fixed income securities. For a
            discussion of the concept of duration, see "Appendix A--Descrip-
            tion of Duration."
               The investment objective of the Money Market and Short-Term
            Funds is to seek to obtain maximum current income consistent with
            preservation of capital and daily liquidity. The Money Market Fund
            also attempts to maintain a stable net asset value of $1.00 per
            share, although there can be no assurance that it will be success-
            ful in doing so. The investment objective of the Real Return Bond
            Fund is to seek to realize maximum real return, consistent with
            the preservation of real capital and prudent investment manage-
            ment. For a discussion of "real return," see "Total Return and
            Real Return," below. The investment objective of the Municipal
            Bond Fund is to seek high current income exempt from federal in-
            come tax, consistent with preservation of capital. Capital appre-
            ciation is a secondary objective of the Municipal Bond Fund. The
            investment objective of the Global Bond Fund II is to seek maximum
            total return, consistent with the preservation of capital. Each of
            the remaining Fixed Income Funds seeks to maximize total return,
            consistent with preservation of capital and prudent investment
            management.
               
               In selecting securities for each Fixed Income Fund, the Adviser
            utilizes economic forecasting, interest rate anticipation, credit
            and call risk analysis, foreign currency exchange rate forecast-
            ing, and other security selection techniques. The proportion of
            each Fund's assets committed to investment in securities with par-
            ticular characteristics (such as maturity, type and coupon rate)
            will vary based on the Adviser's outlook for the U.S. and foreign
            economies, the financial markets, and other factors.     
               
               Each of the Fixed Income Funds will invest at least 65% of its
            assets in the following types of securities, which, unless specif-
            ically provided otherwise in the descriptions of the Funds that
            follow, may be issued by domestic or foreign entities and denomi-
            nated in U.S. dollars or foreign currencies: securities issued or
            guaranteed by the U.S. Government, its agencies or instrumentali-
            ties ("U.S. Government securities"); corporate debt securities,
            including convertible securities and corporate commercial paper;
            mortgage-backed and other asset-backed securities; inflation-in-
            dexed bonds issued by both governments and corporations; struc-
            tured notes, including hybrid or "indexed" securities, catastrophe
            bonds, and loan participations; delayed funding loans and revol-
            ving credit facilities; bank certificates of deposit, fixed time
            deposits and bankers' acceptances; repurchase agreements and re-
            verse repurchase agreements; debt securities issued by states or
            local governments and their agencies, authorities and other in-
            strumentalities; obligations of foreign governments or their sub-
            divisions, agencies and instrumentalities; and obligations of in-
            ternational agencies or supranational     
 
12
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            entities. Fixed income securities may have fixed, variable, or
            floating rates of interest, including rates of interest that vary
            inversely at a multiple of a designated or floating rate, or that
            vary according to changes in relative values of currencies. Each
            of the Fixed Income Funds may hold different percentages of its
            assets in these various types of securities, and each Fund, except
            the Money Market Fund and the Municipal Bond Fund, may invest all
            of its assets in derivative instruments or in mortgage- or asset-
            backed securities. Each of the Fixed Income Funds, except the
            Money Market Fund, may adhere to its investment policy by entering
            into a series of purchase and sale contracts or utilizing other
            investment techniques by which it may obtain market exposure to
            the securities in which it primarily invests.
               In addition, each of the Fixed Income Funds may lend its port-
            folio securities to brokers, dealers and other financial institu-
            tions in order to earn income. Each of the Fixed Income Funds may
            purchase and sell options and futures subject to the limits dis-
            cussed below, engage in credit spread trades and enter into for-
            ward foreign currency contracts.
               Each of the Real Return Bond, Global Bond II, Foreign Bond, and
            Emerging Markets Bond Funds will normally invest at least 80% of
            its total assets in "bonds." For this purpose, each of these Funds
            considers the various types of debt or fixed income securities in
            which it invests, as specifically described elsewhere in this Pro-
            spectus, to be "bonds" as referenced in that Fund's name. The use
            of this name is not meant to restrict a Fund's investment to the
            narrow category of debt securities that are formally called
            "bonds."
               
               As a non-fundamental, operating policy, the Adviser intends to
            use foreign currency-related derivative instruments (currency
            futures and related options, currency options, forward contracts
            and swap agreements) in an effort to hedge foreign currency risk
            with respect to at least 75% of the assets of the Fixed Income
            Funds (other than the Emerging Markets Bond Fund) denominated in
            currencies other than the U.S. dollar. There can be no assurance
            that the Adviser will be successful in doing so. The active use of
            currency derivatives involves transaction costs which may ad-
            versely effect yield and return.     
 
            The compositions of the Fixed Income Funds differ as follows:
 
            MONEY MARKET FUND seeks maximum current income consistent with the
            preservation of capital and daily liquidity. It attempts to
            achieve this objective by investing at least 95% of its total as-
            sets, measured at the time of investment, in a diversified portfo-
            lio of the highest quality money market securities. The Fund may
            also invest up to 5% of its total assets, measured at the time of
            investment, in money market securities that are in the second-
            highest rating category for short-term obligations. The Fund's in-
            vestments in securities will be limited to U.S. dollar-denominated
            securities that mature in 397 days or less from the date of pur-
            chase. The dollar-weighted average portfolio maturity of the Fund
            will not exceed 90 days. The Fund may invest in the following: ob-
            ligations of the U.S. Government (including its agencies and in-
            strumentalities); short-term corporate debt securities of domestic
            and foreign corporations; obligations of domestic and foreign com-
            mercial banks, savings banks, and savings and loan associations;
            and commercial paper. The Fund may invest more than 25% of its to-
            tal assets in securities or obligations issued by U.S. banks.
               The Fund may invest only in securities that comply with the
            quality, maturity and diversification requirements of Rule 2a-7
            under the Investment Company Act of 1940, which regulates money
            market funds.
               
            SHORT-TERM FUND invests in a diversified portfolio of fixed income
            securities of varying maturities. The average portfolio duration
            of this Fund will normally not exceed one year. The Fund may in-
            vest up to 10% of its assets in fixed income securities that are
            rated below investment grade (rated below Baa by Moody's Investors
            Service, Inc. ("Moody's") or BBB by Standard and Poor's Ratings
            Services ("S&P")) but rated B or higher by Moody's or S&P (or, if
            unrated, determined by the Adviser to be of comparable quality).
            For information on the risks associated with investments in secu-
            rities rated below investment grade, see "Appendix B--Description
            of Securities Ratings." The Fund may invest up to 5% of its assets
            in securities denominated in foreign currencies, and may invest
            beyond this limit in U.S. dollar-denominated securities of foreign
            issuers.     
                                                     August 1, 1998 Prospectus
                                                                              13
<PAGE>
 
               
            LOW DURATION FUND invests in a diversified portfolio of fixed in-
            come securities of varying maturities. The average portfolio dura-
            tion of this Fund will normally vary within a one- to three-year
            time frame based on the Adviser's forecast for interest rates. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Adviser to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings." The Fund may invest
            up to 20% of its assets in securities denominated in foreign cur-
            rencies, and may invest beyond this limit in U.S. dollar-denomi-
            nated securities of foreign issuers. The total rate of return for
            this Fund is expected to exhibit less volatility than that of the
            Total Return Fund because its duration will be shorter.     
               
            REAL RETURN BOND FUND invests under normal circumstances at least
            65% of its total assets in inflation-indexed bonds issued by U.S.
            and foreign governments, their agencies or instrumentalities. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Adviser to be of
            comparable quality).The Fund may invest up to 35% of its assets in
            other types of fixed income instruments, including securities de-
            nominated in foreign currencies, (and the Fund may also invest be-
            yond this limit in U.S. dollar-denominated securities of foreign
            issuers).     
               Inflation-indexed bonds are fixed income securities whose prin-
            cipal value is periodically adjusted according to the rate of in-
            flation. Such bonds generally are issued at an interest rate lower
            than non-inflation related bonds, but are expected to retain their
            value against inflation over time. For a more complete discussion
            of inflation-indexed bonds, including the risks associated with
            investing in such securities, see "Characteristics and Risks of
            Securities and Investment Techniques--Inflation-Indexed Bonds."
            See "Taxes" for information about the possible tax consequences of
            investing in the Fund and in inflation-indexed bonds.
               
               In managing fixed income securities, one of the principal tools
            generally used by the Adviser is "duration," which is a measure of
            the expected life of a fixed income security on a present value
            basis, incorporating a bond's yield, coupon interest payments, fi-
            nal maturity and call features. See "Appendix A--Description of
            Duration." Because of the unique features of inflation-indexed
            bonds, the Adviser utilizes a modified form of duration for the
            Real Return Bond Fund ("modified real duration") which measures
            price changes in such bonds as a result of changes in real, rather
            than nominal, interest rates. Although there is no limit on the
            modified real duration of the Real Return Bond Fund, it is ex-
            pected that the average modified real duration of the Fund will
            normally vary approximately within the range of the average modi-
            fied real duration of all inflation-indexed bonds issued by the
            U.S. Treasury in the aggregate.     
               
            TOTAL RETURN FUND invests under normal circumstances at least 65%
            of its assets in a diversified portfolio of fixed income securi-
            ties of varying maturities. The average portfolio duration of this
            Fund will normally vary within a three- to six-year time frame
            based on the Adviser's forecast for interest rates. The Fund may
            invest up to 10% of its assets in fixed income securities that are
            rated below investment grade but rated B or higher by Moody's or
            S&P (or, if unrated, determined by the Adviser to be of comparable
            quality). For information on the risks associated with investments
            in securities rated below investment grade, see "Appendix B--De-
            scription of Securities Ratings." The Fund may also invest up to
            20% of its assets in securities denominated in foreign currencies,
            and may invest beyond this limit in U.S. dollar-denominated secu-
            rities of foreign issuers. Portfolio holdings will be concentrated
            in areas of the bond market (based on quality, sector, coupon or
            maturity) which the Adviser believes to be relatively undervalued.
            The total rate of return for this Fund is expected to exhibit less
            volatility than that of the Long-Term U.S. Government Fund because
            its duration will normally be shorter.     
               
            HIGH YIELD FUND invests under normal circumstances at least 65% of
            its assets in a diversified portfolio of fixed income securities
            rated lower than Baa by Moody's or lower than BBB by S&P but rated
            at least B by Moody's or S&P (or, if unrated, determined by the
            Adviser to be of comparable quality). The remainder of the Fund's
            assets may be invested in investment grade fixed income securities
            (i.e., securities rated at least Baa by Moody's or BBB by S&P, or,
            if unrated,     
 
14
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            deemed by the Adviser to be of comparable quality). The average
            portfolio duration of this Fund will normally vary within a two-
            to six-year time frame depending on the Adviser's view of the po-
            tential for total return offered by a particular duration strate-
            gy. The Fund may invest in securities of foreign issuers, but only
            those that are U.S. dollar-denominated. The Fund may also engage
            in hedging strategies involving equity options.     
               
               Investments in high yield securities, while generally providing
            greater potential opportunity for capital appreciation and higher
            yields than investments in higher rated securities, also entail
            greater risk, including the possibility of default or bankruptcy
            of the issuer of such securities. Risk of default or bankruptcy
            may be greater in periods of economic uncertainty or recession, as
            the issuers of high yield securities may be less able to withstand
            general economic downturns. The Adviser seeks to reduce risk
            through diversification, credit analysis and attention to current
            developments and trends in both the economy and financial markets.
            The value of all fixed income securities, including those held by
            the Fund, can be expected to change inversely with interest rates.
            Securities rated below investment grade may sometimes be referred
            to as "junk bonds." For a further discussion of the special risks
            of investing in lower rated securities, see "Characteristics and
            Risks of Securities and Investment Techniques--High Yield Securi-
            ties ("Junk Bonds")."     
               
            MUNICIPAL BOND FUND seeks high current income exempt from federal
            income tax, consistent with preservation of capital. Capital ap-
            preciation is a secondary objective. The Fund seeks its objectives
            by investing in debt securities whose interest is, in the opinion
            of bond counsel for the issuer at the time of issuance, exempt
            from federal income tax ("Municipal Bonds"). Municipal Bonds gen-
            erally are issued by states and local governments and their agen-
            cies, authorities and other instrumentalities. It is a policy of
            the Fund that, under normal market conditions, at least 80% of its
            net assets will be invested in Municipal Bonds. The Fund may in-
            vest up to 20% of its net assets in U.S. Government securities,
            money market instruments and/or "private activity" bonds. Under
            normal circumstances, the average portfolio duration of the Munic-
            ipal Bond Fund will vary within a three- to ten-year time frame,
            based on the Adviser's forecast for interest rates.     
               
               The Fund may invest up to 10% of its net assets in Municipal
            Bonds or "private activity" bonds which are rated below Baa by
            Moody's or BBB by S&P but which are rated at least Ba by Moody's
            or BB by S&P (or, if unrated, determined by the Adviser to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings."     
               
            LONG-TERM U.S. GOVERNMENT FUND invests in a diversified portfolio
            of primarily U.S. Government securities, which may be represented
            by futures contracts (including related options) with respect to
            such securities, and options on such securities, when the Adviser
            deems it appropriate to do so. The Fund will have a minimum aver-
            age portfolio duration of eight years. For point of reference, the
            dollar-weighted average portfolio maturity of the Fund is normally
            expected to be more than ten years. The total rate of return is
            expected to exhibit more volatility than that of the other Fixed
            Income Funds due to the greater investment risk normally associ-
            ated with longer duration investments. The Long-Term U.S. Govern-
            ment Fund's investments in fixed income securities are limited to
            those of U.S. dollar-denominated securities of domestic (U.S.) is-
            suers that are rated at least A by Moody's or S&P (or, if unrated,
            determined by the Adviser to be of comparable quality). In addi-
            tion, the Fund will not acquire a security if, as a result, more
            than 10% of the Fund's total assets would be invested in securi-
            ties rated below Aa by Moody's or below AA by S&P, or if more than
            25% of the Fund's total assets would be invested in securities
            rated Aa by Moody's or AA by S&P.     
               
            GLOBAL BOND FUND II invests in a portfolio of fixed income securi-
            ties denominated in major currencies, baskets of foreign curren-
            cies (such as the ECU), and the U.S. dollar. Under normal circum-
            stances, at least 65% of the Fund's assets will be invested in
            fixed income securities of issuers located in at least three coun-
            tries (one of which may be the United States), which may be repre-
            sented by futures contracts (including related options) with re-
            spect to such securities, and options on such securities, when the
            Adviser deems it appropriate to do so. Depending on the Adviser's
            current opinion as to the proper allocation of assets among domes-
            tic and foreign issuers, investments in the securities of issuers
            located     
 
                                                                             15
                                                     August 1, 1998 Prospectus
<PAGE>
 
               
            outside the United States will normally vary between 25% and 75%
            of the Fund's assets. The Fund may invest up to 10% of its assets
            in fixed income securities that are rated below investment grade
            but rated B or higher by Moody's or S&P (or, if unrated, deter-
            mined by the Adviser to be of comparable quality). For information
            on the risks associated with investments in securities rated below
            investment grade, see "Appendix B--Description of Securities Rat-
            ings." The average portfolio duration of this Fund will normally
            vary within a three- to six-year time frame.     
               
              The Foreign Bond Fund differs from the Global Bond Fund II pri-
            marily in the extent to which assets are invested in the securi-
            ties of issuers located outside the United States. The Adviser
            will select these Funds' foreign country and currency compositions
            based on an evaluation of relative interest rates, exchange rates,
            monetary and fiscal policies, trade and current account balances,
            and any other specific factors the Adviser believes to be rele-
            vant.     
               
            FOREIGN BOND FUND invests in a portfolio of fixed income securi-
            ties primarily denominated in major foreign currencies and baskets
            of foreign currencies (such as the European Currency Unit, or
            "ECU"). The Adviser will invest the assets of the Fund in a number
            of international bond markets so that, under normal circumstances,
            the Fund will invest at least 85% of its assets in securities of
            issuers located outside the United States, representing at least
            three foreign countries, which may be represented by futures con-
            tracts (including related options) with respect to such securi-
            ties, and options on such securities, when the Adviser deems it
            appropriate to do so. The Fund may invest up to 10% of its assets
            in fixed income securities that are rated below investment grade
            but rated B or higher by Moody's or S&P (or, if unrated, deter-
            mined by the Adviser to be of comparable quality). Securities
            rated below investment grade may sometimes be referred to as "junk
            bonds." For information on the risks associated with investments
            in securities rated below investment grade, see "Appendix B--De-
            scription of Securities Ratings." The average portfolio duration
            of this Fund will normally vary within a three- to six-year time
            frame.     
               
            EMERGING MARKETS BOND FUND invests in a portfolio of fixed income
            securities denominated in foreign currencies and the U.S. dollar.
            Under normal market conditions, the Fund will invest at least 80%
            of its assets in fixed income securities of issuers that economi-
            cally are tied to countries with emerging securities markets. The
            Fund may invest up to 20% of its assets in other types of fixed
            income instruments, including securities of issuers located in, or
            securities denominated in currencies of, countries with developed
            foreign securities markets. The Fund also may invest up to 10% of
            its assets in shares of investment companies that invest primarily
            in emerging market debt securities. The average portfolio duration
            of the Fund will vary based on the Adviser's view of the potential
            for total return offered by a particular duration strategy and,
            under normal market conditions, is not expected to exceed eight
            years.     
               
               The Adviser has broad discretion to identify and invest in
            countries that it considers to qualify as emerging securities mar-
            kets. However, the Adviser generally considers an emerging securi-
            ties market to be one located in any country that is defined as an
            emerging or developing economy by any of the following: the Inter-
            national Bank for Reconstruction and Development (i.e., the World
            Bank), including its various offshoots, such as the International
            Finance Corporation, or the United Nations or its authorities. The
            Fund's investments in emerging market fixed income securities may
            be represented by futures contracts (including related options)
            with respect to such securities, options on such securities, eq-
            uity securities (including common stocks) upon the conversion of
            convertible securities, or securities the return on which is de-
            rived primarily from emerging securities markets, when the Adviser
            deems it appropriate to do so.     
               
               The Fund emphasizes countries with relatively low gross na-
            tional product per capita and with the potential for rapid eco-
            nomic growth. The Adviser will select the Fund's country and cur-
            rency composition based on its evaluation of relative interest
            rates, inflation rates, exchange rates, monetary and fiscal poli-
            cies, trade and current account balances, and any other specific
            factors the Adviser believes to be relevant. The Fund likely will
            concentrate its investments in Asia, Africa, the Middle East,
            Latin America and the developing countries of Europe. Accordingly,
            the Fund will be particularly susceptible to the effects of polit-
            ical and economic developments in these regions. This effect may
            be exacerbated by a relative scarcity of issuers in certain of
            these markets, which may result in the Fund being highly     
 
16
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            concentrated in a small number of issuers. For a further discus-
            sion of the special risks of investing in foreign and emerging
            market countries, see "Characteristics and Risks of Securities and
            Investment Techniques--Foreign Securities."
               
               The Fund may invest substantially all of its assets in securi-
            ties rated below investment grade but rated B or higher by Moody's
            or S&P (or, if unrated, determined by the Adviser to be of compa-
            rable quality). Such securities are sometimes referred to as "junk
            bonds." While these securities generally provide greater potential
            opportunity for capital appreciation and higher yields than in-
            vestments in higher rated securities, they also entail greater
            risk, including the possibility of default or bankruptcy of the
            issuer of the securities. Risk of default or bankruptcy may be
            greater in periods of economic uncertainty or recession, as the
            issuers may be less able to withstand general economic downturns
            affecting the regions in which the Fund invests. The Adviser seeks
            to reduce risk through diversification, credit analysis and atten-
            tion to current developments and trends in emerging market econo-
            mies and markets. The value of all fixed income securities, in-
            cluding those held by the Fund, can be expected to change in-
            versely with interest rates. For a further discussion of the spe-
            cial risks of investing in lower rated securities, see "Character-
            istics and Risks of Securities and Investment Techniques--High
            Yield Securities ("Junk Bonds")."     
 
 
STOCK FUND     
DESCRIPTION STOCKSPLUS FUND, as its investment objective, seeks to achieve to-
            tal return which exceeds the total return performance of the Stan-
            dard & Poor's 500 Composite Stock Price Index ("S&P 500").
            StocksPLUS is the name of a proprietary portfolio management
            strategy which utilizes S&P 500 derivatives in addition to or in
            place of S&P 500 stocks to equal or exceed the performance of the
            S&P 500. The Adviser expects that under normal market conditions,
            the Fund will invest substantially all of its assets in S&P 500
            derivatives, backed by a portfolio of fixed income securities. The
            Adviser will actively manage the fixed income assets serving as
            cover for derivatives, as well as any other fixed income assets
            held by the Fund, with a view toward enhancing the Fund's total
            return investment performance, subject to an overall portfolio du-
            ration which is normally not expected to exceed one year. See "Ap-
            pendix A--Description of Duration."     
               The S&P 500 is composed of 500 selected common stocks, most of
            which are listed on the New York Stock Exchange. S&P chooses the
            stocks to be included in the S&P 500 solely on a statistical ba-
            sis. The weightings of stocks in the index are based on each
            stock's relative total market value, that is, its market price per
            share times the number of shares outstanding. Stocks represented
            currently in the S&P 500 represent approximately two-thirds of the
            total market value of all U.S. common stocks. The Fund is neither
            sponsored by nor affiliated with S&P. The Fund will seek to remain
            invested in S&P 500 derivatives or S&P 500 stocks even when the
            S&P 500 is declining.
               
               When S&P 500 derivatives appear to be overvalued relative to
            the S&P 500, the Fund may invest up to 100% of its assets in a
            "basket" of S&P 500 stocks. The composition of this basket will be
            determined by standard statistical techniques that analyze the
            historical correlation between the return of every stock currently
            in the S&P 500 and the return on the S&P 500 itself. The Adviser
            may employ fundamental stock analysis only to choose among stocks
            that have already satisfied the statistical correlation tests.
            Stocks chosen for the Fund are not limited to those with any par-
            ticular weighting in the S&P 500.     
               
               Positions in S&P 500 futures and options on futures will be en-
            tered into only to the extent they constitute permissible posi-
            tions for the Fund according to applicable rules of the Commodity
            Futures Trading Commission ("CFTC"). From time to time, the Ad-
            viser may be constrained in its ability to use S&P 500 derivatives
            either by requirements of the Internal Revenue Code or by an unan-
            ticipated inability to close out positions when it would be most
            advantageous to do so. A large number of investors use S&P 500 de-
            rivatives for both hedging and speculative purposes, and although
            generally this helps guarantee a liquid market in those instru-
            ments, at times liquidity may be     
            limited. For more information about S&P 500 derivatives, see
            "Characteristics and Risks of Securities and Investment Tech-
            niques--Derivative Instruments."
               Assets of the StocksPLUS Fund not invested in equity securities
            may be invested in securities eligible for purchase by the Fixed
            Income Funds. The Fund may invest up to 10% of its assets in fixed
            income securities that are below "investment grade," i.e., rated
            below Baa by Moody's or BBB by S&P, but at least B (or, if
            unrated, determined by the
 
                                                                             17
                                                     August 1, 1998 Prospectus
<PAGE>
 
               
            Adviser to be of comparable quality). In addition, the StocksPLUS
            Fund may lend its portfolio securities to brokers, dealers and
            other financial institutions in order to earn income. The Fund may
            also invest all of its assets in derivative instruments, as de-
            scribed under "Characteristics of Securities and Investment Tech-
            niques--Derivative Instruments." In addition, the Fund may invest
            up to 20% of its assets in securities of foreign issuers, may pur-
            chase and sell options and futures on foreign currencies, and may
            enter into forward foreign currency contracts.     
               
               To the extent that the Fund invests in S&P 500 derivatives
            backed by a portfolio of fixed income securities, under certain
            conditions, generally in a market where the value of both S&P 500
            derivatives and fixed income securities are declining, the Fund
            may experience greater losses than would be the case if it were to
            invest directly in a portfolio of S&P 500 stocks.     
 
 
TOTAL       The "total return" sought by certain of the Funds will consist of
RETURN AND  interest and dividends from underlying securities, capital appre-
REAL RETURN ciation reflected in unrealized increases in value of portfolio
            securities (realized by the shareholder only upon selling shares),
            or realized from the purchase and sale of securities and use of
            futures and options, or gains from favorable changes in foreign
            currency exchange rates. Generally, over the long term, the total
            return obtained by a portfolio investing primarily in fixed income
            securities is not expected to be as great as that obtained by a
            portfolio that invests primarily in equity securities. At the same
            time, the market risk and price volatility of a fixed income port-
            folio is expected to be less than that of an equity portfolio, so
            that a fixed income portfolio is generally considered to be a more
            conservative investment. The change in market value of fixed in-
            come securities (and therefore their capital appreciation or de-
            preciation) is largely a function of changes in the current level
            of interest rates. Generally, when interest rates are falling, a
            portfolio with a shorter duration will not generate as high a
            level of total return as a portfolio with a longer duration. Con-
            versely, when interest rates are rising, a portfolio with a
            shorter duration will generally outperform longer duration portfo-
            lios. When interest rates are flat, shorter duration portfolios
            generally will not generate as high a level of total return as
            longer duration portfolios (assuming that long-term interest rates
            are higher than short-term rates, which is commonly the case).
            With respect to the composition of any fixed income portfolio, the
            longer the duration of the portfolio, the greater the anticipated
            potential for total return, with, however, greater attendant mar-
            ket risk and price volatility than for a portfolio with a shorter
            duration. The market value of fixed income securities denominated
            in currencies other than the U.S. dollar also may be affected by
            movements in foreign currency exchange rates.
               The change in market value of equity securities (and therefore
            their capital appreciation or depreciation) may depend upon a num-
            ber of factors, including: conditions in the securities markets,
            the business success of the security's issuer, changing interest
            rates, real or perceived economic and competitive industry condi-
            tions, and foreign currency exchange rates. Historically, the to-
            tal return performance of equity-oriented portfolios has generally
            been greater over the long term than fixed income portfolios. How-
            ever, the market risk and price volatility of an equity portfolio
            is generally greater than that of a fixed income portfolio, and is
            generally considered to be a more aggressive investment.
               "Real Return," or "Inflation Adjusted Return," as referenced in
            the name and investment objective of the Real Return Bond Fund, is
            a measure of the change in purchasing power of money invested in a
            particular instrument after adjusting for inflation. An investment
            in a security generating a high nominal return (such as a typical
            U.S. Government Treasury bond) may not generate a high real return
            once inflation is considered. For example, an instrument generat-
            ing a 9% nominal return at a time when inflation is 6% has a real
            return of approximately 3%; that is, the purchasing power of the
            money invested in that instrument would only increase by approxi-
            mately 3%. On the other hand, an inflation-indexed instrument gen-
            erating a 5% real return would generate a 5% increase in purchas-
            ing power regardless of the rate of inflation. As stated above,
            the investment objective of the Fund is to seek to achieve maximum
            real return. The total return (not adjusted for inflation) at-
            tained by this Fund may be less than the total return attained by
            other of the Funds that do not invest primarily in inflation-in-
            dexed securities.
               In the case of inflation-indexed bonds, changes in market value
            are tied to the relationship between nominal interest rates and
            the rate of inflation. If inflation were to rise at a faster rate
            than nominal interest rates, real interest
 
18
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            rates might decline, leading to an increase in value of inflation-
            indexed bonds. In contrast, if nominal interest rates increase at
            a faster rate than inflation, real interest rates might increase,
            leading to a decrease in value of inflation-indexed bonds.
 
            Investment Risks and Considerations
 
            The following are some of the principal risks of investing in the
            Funds. Investors should read this Prospectus carefully for a more
            complete discussion of the risks relating to an investment in the
            Funds. The net asset value per share of any Fund may be less at
            the time of redemption than it was at the time of investment. Gen-
            erally, the value of fixed income securities can be expected to
            vary inversely with changes in prevailing interest rates, i.e., as
            interest rates rise, market value tends to decrease, and vice
            versa, although this may not be true in the case of inflation-
            indexed bonds. In addition, certain of the Funds may invest in se-
            curities rated lower than Baa by Moody's or S&P. Such securities
            carry a high degree of credit risk and are considered speculative
            by the major rating agencies.
               Certain Funds may invest in securities of foreign issuers,
            which may be subject to additional risk factors, including foreign
            currency and political risks, not applicable to securities of U.S.
            issuers. Certain of the Funds' investment techniques may involve a
            form of borrowing, which may tend to exaggerate the effect on net
            asset value of any increase or decrease in the market value of a
            Fund's portfolio and may require liquidation of portfolio posi-
            tions when it is not advantageous to do so. Certain Funds may sell
            securities short, which exposes the Fund to a risk of loss if the
            value of the security sold short should increase.
               
               All Funds (except the Money Market Fund) may use derivative in-
            struments, consisting of futures, options, options on futures, and
            swap agreements, for hedging purposes or as part of their invest-
            ment strategies. Use of these instruments may involve certain
            costs and risks, including the risk that a Fund could not close
            out a position when it would be most advantageous to do so, the
            risk of an imperfect correlation between the value of the securi-
            ties being hedged and the value of the particular derivative in-
            strument, and the risk that unexpected changes in interest rates
            may adversely affect the value of a Fund's investments in particu-
            lar derivative instruments. Unless otherwise indicated, all limi-
            tations applicable to Fund investments (as stated in this Prospec-
            tus and in the Statement of Additional Information) apply only at
            the time a transaction is entered into. Any subsequent change in a
            rating assigned by any rating service to a security (or, if
            unrated, deemed to be of comparable quality), or change in the
            percentage of Fund assets invested in certain securities or other
            instruments, or change in the average duration of a Fund's invest-
            ment portfolio, resulting from market fluctuations or other
            changes in a Fund's total assets, will not require a Fund to dis-
            pose of an investment until the Adviser determines that is practi-
            cable to sell or close out the investment without undue market or
            tax consequences to the Fund. In the event that ratings services
            assign different ratings to the same security, the Adviser will
            determine which rating it believes best reflects the security's
            quality and risk at that time, which may be the higher of the sev-
            eral assigned ratings.     
               Investors should carefully consider the possible tax conse-
            quences from investing in the Real Return Bond Fund. The Fund in-
            vests primarily in securities that for tax purposes may be consid-
            ered to have been issued originally at a discount. Accordingly,
            the Fund may be required to make annual distributions to share-
            holders in excess of the cash received by the Fund in a given pe-
            riod from those investments. See "Characteristics and Risks of Se-
            curities and Investment Techniques--Inflation-Indexed Bonds" and
            "Taxes" for additional information.
               
               The Real Return Bond, Global Bond II, Foreign Bond and Emerging
            Markets Bond Funds are "non-diversified" for purposes of the In-
            vestment Company Act of 1940 ("1940 Act"), meaning that they may
            invest a greater percentage of their assets in the securities of
            one issuer than the other Funds. The Funds are still, however,
            subject to diversification requirements imposed by the Internal
            Revenue Code of 1986, as amended, which means that as of the end
            of each calendar quarter, a Fund may have no more than 25% of its
            assets invested in the securities of a single issuer, and may,
            with respect to 50% of its assets, have no more than 5% of its as-
            sets invested in the securities of a single issuer. As "non-diver-
            sified" portfolios, these Funds may be more susceptible to risks
            associated with a single economic, political or regulatory occur-
            rence than a diversified portfolio might be.     
 
                                                                             19
                                                     August 1, 1998 Prospectus
<PAGE>
 
               
               The Funds offer their shares to both retail and institutional
            investors. Institutional shareholders, some of whom also may be
            investment advisory clients of Pacific Investment Management, may
            hold large positions in certain of the Funds. Such shareholders
            may on occasion make large redemptions of their holdings in the
            Funds to meet their liquidity needs, in connection with strategic
            adjustments to their overall portfolio of investments, or for
            other purposes. Large redemptions from some Funds could require
            the Adviser to liquidate portfolio positions when it is not most
            desirable to do so. Liquidation of portfolio holdings also may
            cause a Fund to realize taxable capital gains.     
 
            Characteristics and Risks of
            Securities and Investment Techniques
 
            The following describes in greater detail different types of secu-
            rities and investment techniques used by the individual Funds, and
            discusses certain concepts relevant to the investment policies of
            the Funds. Additional information about the Funds' investments and
            investment practices may be found in the Statement of Additional
            Information.
 
 
U.S.        U.S. Government securities are obligations of, or guaranteed by,
GOVERNMENT  the U.S. Government, its agencies or instrumentalities. The U.S.
SECURITIES  Government does not guarantee the net asset value of the Funds'
            shares. Some U.S. Government securities, such as Treasury bills,
            notes and bonds, and securities guaranteed by the Government Na-
            tional Mortgage Association ("GNMA"), are supported by the full
            faith and credit of the United States; others, such as those of
            the Federal Home Loan Banks, are supported by the right of the is-
            suer to borrow from the U.S. Treasury; others, such as those of
            the Federal National Mortgage Association ("FNMA"), are supported
            by the discretionary authority of the U.S. Government to purchase
            the agency's obligations; and still others, such as those of the
            Student Loan Marketing Association, are supported only by the
            credit of the instrumentality. U.S. Government securities include
            securities that have no coupons, or have been stripped of their
            unmatured interest coupons, individual interest coupons from such
            securities that trade separately, and evidences of receipt of such
            securities. Such securities may pay no cash income, and are pur-
            chased at a deep discount from their value at maturity. Because
            interest on zero coupon securities is not distributed on a current
            basis but is, in effect, compounded, zero coupon securities tend
            to be subject to greater market risk than interest-paying securi-
            ties of similar maturities. Custodial receipts issued in connec-
            tion with so-called trademark zero coupon securities, such as CATs
            and TIGRs, are not issued by the U.S. Treasury, and are therefore
            not U.S. Government securities, although the underlying bond rep-
            resented by such receipt is a debt obligation of the U.S. Trea-
            sury. Other zero coupon Treasury securities (STRIPs and CUBEs) are
            direct obligations of the U.S. Government.
 
 
CORPORATE   Corporate debt securities include corporate bonds, debentures,
DEBT        notes and other similar corporate debt instruments, including con-
SECURITIES  vertible securities. Debt securities may be acquired with warrants
            attached. Corporate income-producing securities may also include
            forms of preferred or preference stock. The rate of interest on a
            corporate debt security may be fixed, floating or variable, and
            may vary inversely with respect to a reference rate. See "Variable
            and Floating Rate Securities" below. The rate of return or return
            of principal on some debt obligations may be linked or indexed to
            the level of exchange rates between the U.S. dollar and a foreign
            currency or currencies.
               
               Investments in corporate debt securities that are rated below
            investment grade (rated below Baa (Moody's) or BBB (S&P)) are de-
            scribed as "speculative" both by Moody's and S&P. Such securities
            are sometimes referred to as "junk bonds," and may be subject to
            greater market fluctuations, less liquidity and greater risk of
            loss of income or principal, including a greater possibility of
            default or bankruptcy of the issuer of such securities, than are
            more highly rated debt securities. Moody's also describes securi-
            ties rated Baa as having speculative characteristics. The Adviser
            seeks to minimize these risks through diversification, in-depth
            credit analysis and attention to current developments in interest
            rates and market conditions. See "Appendix B--Description of Secu-
            rities Ratings." Investments in high yield securities are dis-
            cussed separately below under "High Yield Securities ("Junk
            Bonds")."     
 
20
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
 
CONVERTIBLE Each Fund (except the Municipal Bond Fund) may invest in convert-
SECURITIES  ible securities, which may offer higher income than the common
            stocks into which they are convertible. Typically, convertible se-
            curities are callable by the company, which may, in effect, force
            conversion before the holder would otherwise choose.
               The convertible securities in which the Funds may invest con-
            sist of bonds, notes, debentures and preferred stocks which may be
            converted or exchanged at a stated or determinable exchange ratio
            into underlying shares of common stock. A Fund may be required to
            permit the issuer of a convertible security to redeem the securi-
            ty, convert it into the underlying common stock, or sell it to a
            third party. Thus, a Fund may not be able to control whether the
            issuer of a convertible security chooses to convert that security.
            If the issuer chooses to do so, this action could have an adverse
            effect on a Fund's ability to achieve its investment objectives.
               While the Fixed Income Funds intend to invest primarily in
            fixed income securities, each may invest in convertible securities
            or equity securities. While some countries or companies may be re-
            garded as favorable investments, pure fixed income opportunities
            may be unattractive or limited due to insufficient supply, legal
            or technical restrictions. In such cases, a Fund may consider eq-
            uity securities or convertible bonds to gain exposure to such in-
            vestments.
 
 
LOAN
PARTICIPATIONS
AND
ASSIGNMENTS
            Certain Funds may invest in fixed- and floating-rate loans ar-
            ranged through private negotiations between an issuer of debt in-
            struments and one or more financial institutions ("lenders"). Gen-
            erally, the Funds' investments in loans are expected to take the
            form of loan participations and assignments of portions of loans
            from third parties.
               Large loans to corporations or governments may be shared or
            syndicated among several lenders, usually banks. The Funds may
            participate in such syndicates, or can buy part of a loan, becom-
            ing a direct lender. Participations and assignments involve spe-
            cial types of risk, including limited marketability and the risks
            of being a lender. See "Illiquid Securities" for a discussion of
            the limits on a Fund's investments in loan participations and as-
            signments with limited marketability. If a Fund purchases a par-
            ticipation, it may only be able to enforce its rights through the
            lender, and may assume the credit risk of the lender in addition
            to the borrower. In assignments, the Funds' rights against the
            borrower may be more limited than those held by the original lend-
            er.
 
 
DELAYED     The Funds (except the PIMCO Money Market and Municipal Bond Funds)
FUNDING     may also enter into, or acquire participations in, delayed funding
LOANS AND   loans and revolving credit facilities. Delayed funding loans and
REVOLVING   revolving credit facilities are borrowing arrangements in which
CREDIT      the lender agrees to make loans up to a maximum amount upon demand
FACILITIES  by the borrower during a specified term. A revolving credit facil-
            ity differs from a delayed funding loan in that as the borrower
            repays the loan, an amount equal to the repayment may be borrowed
            again during the term of the revolving credit facility. These com-
            mitments may have the effect of requiring a Fund to increase its
            investment in a company at a time when it might not otherwise de-
            cide to do so (including at a time when the company's financial
            condition makes it unlikely that such amounts will be repaid).
               
               The Funds may acquire a participation interest in delayed fund-
            ing loans or revolving credit facilities from a bank or other fi-
            nancial institution. See "Loan Participations and Assignments."
            The terms of the participation require the Fund to make a pro rata
            share of all loans extended to the borrower and entitles the Fund
            to a pro rata share of all payments made by the borrower. Delayed
            funding loans and revolving credit facilities usually provide for
            floating or variable rates of interest. To the extent that a Fund
            is committed to advance additional funds, it will at all times
            segregate assets, determined to be liquid by the Adviser in accor-
            dance with procedures established by the Board of Trustees, in an
            amount sufficient to meet such commitments.     
 
VARIABLE
AND         Variable and floating rate securities provide for a periodic ad-
FLOATING    justment in the interest rate paid on the obligations. The terms
RATE        of such obligations must provide that interest rates are adjusted
SECURITIES  periodically based upon an interest rate adjustment index as pro-
            vided in the respective obligations. The adjustment intervals may
            be regular, and range from daily up to annually, or may be event
            based, such as based on a change in the prime rate. The Money Mar-
            ket Fund may invest
                                                     August 1, 1998 Prospectus
                                                                              21
<PAGE>
 
            in a variable rate security having a stated maturity in excess of
            397 calendar days if the interest rate will be adjusted, and the
            Fund may demand payment of principal from the issuer, within the
            period.
               Each of the Fixed Income Funds may invest in floating rate debt
            instruments ("floaters") and (except the Money Market and Munici-
            pal Bond Funds) engage in credit spread trades. The interest rate
            on a floater is a variable rate which is tied to another interest
            rate, such as a money-market index or Treasury bill rate. The in-
            terest rate on a floater resets periodically, typically every six
            months. While, because of the interest rate reset feature, float-
            ers provide a Fund with a certain degree of protection against
            rises in interest rates, a Fund will participate in any declines
            in interest rates as well. A credit spread trade is an investment
            position relating to a difference in the prices or interest rates
            of two securities or currencies, where the value of the investment
            position is determined by movements in the difference between the
            prices or interest rates, as the case may be, of the respective
            securities or currencies.
               Each of the Fixed Income Funds (except the Money Market Fund
            and the Municipal Bond Fund) may also invest in inverse floating
            rate debt instruments ("inverse floaters"). The interest rate on
            an inverse floater resets in the opposite direction from the mar-
            ket rate of interest to which the inverse floater is indexed. An
            inverse floating rate security may exhibit greater price volatil-
            ity than a fixed rate obligation of similar credit quality. The
            Funds have adopted a policy under which no Fund will invest more
            than 5% of its net assets in any combination of inverse floater,
            interest only ("IO"), or principal only ("PO") securities. See
            "Mortgage-Related and Other Asset-Backed Securities" for a discus-
            sion of IOs and POs.
 
 
INFLATION-  Inflation-indexed bonds are fixed income securities whose princi-
INDEXED     pal value is periodically adjusted according to the rate of infla-
BONDS       tion. The interest rate on these bonds is generally fixed at issu-
            ance at a rate lower than typical bonds. Over the life of an in-
            flation-indexed bond, however, interest will be paid based on a
            principal value which is adjusted for inflation.
               Inflation-indexed securities issued by the U.S. Treasury will
            initially have maturities of five or ten years, although it is an-
            ticipated that securities with other maturities will be issued in
            the future. The securities will pay interest on a semi-annual ba-
            sis, equal to a fixed percentage of the inflation-adjusted princi-
            pal amount. For example, if an investor purchased an inflation-in-
            dexed bond with a par value of $1,000 and a 3% real rate of return
            coupon (payable 1.5% semi-annually), and inflation over the first
            six months were 1%, the mid-year par value of the bond would be
            $1,010 and the first semi-annual interest payment would be $15.15
            ($1,010 times 1.5%). If inflation during the second half of the
            year reached 3%, the end-of-year par value of the bond would be
            $1,030 and the second semi-annual interest payment would be $15.45
            ($1,030 times 1.5%).
               If the periodic adjustment rate measuring inflation falls, the
            principal value of inflation-indexed bonds will be adjusted down-
            ward, and consequently the interest payable on these securities
            (calculated with respect to a smaller principal amount) will be
            reduced. Repayment of the original bond principal upon maturity
            (as adjusted for inflation) is guaranteed in the case of U.S.
            Treasury inflation-indexed bonds, even during a period of defla-
            tion. However, the current market value of the bonds is not guar-
            anteed, and will fluctuate. The Funds may also invest in other in-
            flation related bonds which may or may not provide a similar guar-
            antee. If such a guarantee of principal is not provided, the ad-
            justed principal value of the bond repaid at maturity may be less
            than the original principal.
               The value of inflation-indexed bonds is expected to change in
            response to changes in real interest rates. Real interest rates in
            turn are tied to the relationship between nominal interest rates
            and the rate of inflation. Therefore, if inflation were to rise at
            a faster rate than nominal interest rates, real interest rates
            might decline, leading to an increase in value of inflation-in-
            dexed bonds. In contrast, if nominal interest rates increased at a
            faster rate than inflation, real interest rates might rise, lead-
            ing to a decrease in value of inflation-indexed bonds.
               While these securities are expected to be protected from long-
            term inflationary trends, short-term increases in inflation may
            lead to a decline in value. If interest rates rise due to reasons
            other than inflation (for example, due to changes in currency ex-
            change rates), investors in these securities may not be protected
            to the extent that the increase is not reflected in the bond's in-
            flation measure.
 
22
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               The U.S. Treasury has only recently begun issuing inflation-in-
            dexed bonds. As such, there is no trading history of these securi-
            ties, and there can be no assurance that a liquid market in these
            instruments will develop, although one is expected. Lack of a liq-
            uid market may impose the risk of higher transaction costs and the
            possibility that a Fund may be forced to liquidate positions when
            it would not be advantageous to do so. There also can be no assur-
            ance that the U.S. Treasury will issue any particular amount of
            inflation-indexed bonds. Certain foreign governments, such as the
            United Kingdom, Canada and Australia, have a longer history of is-
            suing inflation-indexed bonds, and there may be a more liquid mar-
            ket in certain of these countries for these securities.
               The periodic adjustment of U.S. inflation-indexed bonds is tied
            to the Consumer Price Index for Urban Consumers ("CPI-U"), which
            is calculated monthly by the U.S. Bureau of Labor Statistics. The
            CPI-U is a measurement of changes in the cost of living, made up
            of components such as housing, food, transportation and energy.
            Inflation-indexed bonds issued by a foreign government are gener-
            ally adjusted to reflect a comparable inflation index, calculated
            by that government. There can be no assurance that the CPI-U or
            any foreign inflation index will accurately measure the real rate
            of inflation in the prices of goods and services. Moreover, there
            can be no assurance that the rate of inflation in a foreign coun-
            try will be correlated to the rate of inflation in the United
            States.
               Any increase in the principal amount of an inflation-indexed
            bond will be considered taxable ordinary income, even though in-
            vestors do not receive their principal until maturity. See "Taxes"
            for information about the possible tax consequences of investing
            in the Real Return Bond Fund and in inflation-indexed bonds.
 
MORTGAGE-      
RELATED AND Each of the Funds (except the Money Market Fund and the Municipal
OTHER       Bond Fund) may invest all of its assets in mortgage- or other as-
ASSET-      set-backed securities. The value of some mortgage- or asset-backed
BACKED      securities in which the Funds invest may be particularly sensitive
SECURITIES  to changes in prevailing interest rates, and, like the other in-
            vestments of the Funds, the ability of a Fund to successfully uti-
            lize these instruments may depend in part upon the ability of the
            Adviser to forecast interest rates and other economic factors cor-
            rectly.     
 
            MORTGAGE-PASS-THROUGH SECURITIES are securities representing in-
            terests in "pools" of mortgage loans secured by residential or
            commercial real property in which payments of both interest and
            principal on the securities are generally made monthly, in effect
            "passing through" monthly payments made by the individual borrow-
            ers on the mortgage loans which underlie the securities (net of
            fees paid to the issuer or guarantor of the securities). Early re-
            payment of principal on some mortgage-related securities (arising
            from prepayments of principal due to sale of the underlying prop-
            erty, refinancing, or foreclosure, net of fees and costs which may
            be incurred) may expose a Fund to a lower rate of return upon re-
            investment of principal. Also, if a security subject to prepayment
            has been purchased at a premium, the value of the premium would be
            lost in the event of prepayment. Like other fixed income securi-
            ties, when interest rates rise, the value of a mortgage-related
            security generally will decline; however, when interest rates are
            declining, the value of mortgage-related securities with prepay-
            ment features may not increase as much as other fixed income secu-
            rities. The rate of prepayments on underlying mortgages will af-
            fect the price and volatility of a mortgage-related security, and
            may have the effect of shortening or extending the effective matu-
            rity of the security beyond what was anticipated at the time of
            purchase. To the extent that unanticipated rates of prepayment on
            underlying mortgages increase the effective maturity of a mort-
            gage-related security, the volatility of such security can be ex-
            pected to increase.
               Payment of principal and interest on some mortgage pass-through
            securities (but not the market value of the securities themselves)
            may be guaranteed by the full faith and credit of the U.S. Govern-
            ment (in the case of securities guaranteed by GNMA); or guaranteed
            by agencies or instrumentalities of the U.S. Government (in the
            case of securities guaranteed by FNMA or the Federal Home Loan
            Mortgage Corporation ("FHLMC"), which are supported only by the
            discretionary authority of the U.S. Government to purchase the
            agency's obligations). Mortgage-related securities created by non-
            governmental issuers (such as commercial banks, savings and loan
            institutions, private mortgage insurance companies, mortgage bank-
            ers and other secondary market issuers) may be supported by vari-
            ous forms of insurance or guarantees, including individual loan,
            title, pool and hazard insurance and letters of credit, which may
            be issued by governmental entities, private insurers or the mort-
            gage poolers.
                                                     August 1, 1998 Prospectus
                                                                              23
<PAGE>
 
 
            COLLATERALIZED MORTGAGE OBLIGATIONS ("CMOs") are hybrid mortgage-
            related instruments. Interest and pre-paid principal on a CMO are
            paid, in most cases, on a monthly basis. CMOs may be collateral-
            ized by whole mortgage loans but are more typically collateralized
            by portfolios of mortgage pass-through securities guaranteed by
            GNMA, FHLMC, or FNMA. CMOs are structured into multiple classes,
            with each class bearing a different stated maturity. Monthly pay-
            ments of principal, including prepayments, are first returned to
            investors holding the shortest maturity class; investors holding
            the longer maturity classes receive principal only after the first
            class has been retired. CMOs that are issued or guaranteed by the
            U.S. Government or by any of its agencies or instrumentalities
            will be considered U.S. Government securities by the Funds, while
            other CMOs, even if collateralized by U.S. Government securities,
            will have the same status as other privately issued securities for
            purposes of applying a Fund's diversification tests.
 
            COMMERCIAL MORTGAGE-BACKED SECURITIES include securities that re-
            flect an interest in, and are secured by, mortgage loans on com-
            mercial real property. The market for commercial mortgage-backed
            securities developed more recently and in terms of total outstand-
            ing principal amount of issues is relatively small compared to the
            market for residential single-family mortgage-backed securities.
            Many of the risks of investing in commercial mortgage-backed secu-
            rities reflect the risks of investing in the real estate securing
            the underlying mortgage loans. These risks reflect the effects of
            local and other economic conditions on real estate markets, the
            ability of tenants to make loan payments, and the ability of a
            property to attract and retain tenants. Commercial mortgage-backed
            securities may be less liquid and exhibit greater price volatility
            than other types of mortgage-related or asset-backed securities.
 
            MORTGAGE-RELATED SECURITIES include securities other than those
            described above that directly or indirectly represent a participa-
            tion in, or are secured by and payable from, mortgage loans on
            real property, such as mortgage dollar rolls (see "Reverse Repur-
            chase Agreements, Dollar Rolls, and Borrowings"), CMO residuals or
            stripped mortgage-backed securities ("SMBS"), and may be struc-
            tured in classes with rights to receive varying proportions of
            principal and interest.
               A common type of SMBS will have one class receiving some of the
            interest and most of the principal from the mortgage assets, while
            the other class will receive most of the interest and the remain-
            der of the principal. In the most extreme case, one class will re-
            ceive all of the interest (the interest-only, or "IO" class),
            while the other class will receive all of the principal (the prin-
            cipal-only, or "PO" class). The yield to maturity on an IO class
            is extremely sensitive to the rate of principal payments (includ-
            ing prepayments) on the related underlying mortgage assets, and a
            rapid rate of principal payments may have a material adverse ef-
            fect on a Fund's yield to maturity from these securities. The
            Funds have adopted a policy under which no Fund will invest more
            than 5% of its net assets in any combination of IO, PO, or inverse
            floater securities. The Funds may invest in other asset-backed se-
            curities that have been offered to investors. For a discussion of
            the characteristics of some of these instruments, see the State-
            ment of Additional Information.
 
MUNICIPAL   The Municipal Bond Fund invests in Municipal Bonds which are gen-
BONDS       erally issued by states and local governments and their agencies,
            authorities and other instrumentalities. The Municipal Bonds which
            the Municipal Bond Fund may purchase include general obligation
            bonds and limited obligation bonds (or revenue bonds), including
            industrial development bonds issued pursuant to former federal tax
            law. General obligation bonds are obligations involving the credit
            of an issuer possessing taxing power and are payable from such is-
            suer's general revenues and not from any particular source. Lim-
            ited obligation bonds are payable only from the revenues derived
            from a particular facility or class of facilities or, in some
            cases, from the proceeds of a special excise or other specific
            revenue source. Tax-exempt "private activity" bonds and industrial
            development bonds generally are also revenue bonds and thus are
            not payable from the issuer's general revenues. The Municipal Bond
            Fund may invest in Municipal Bonds with credit enhancements such
            as letters of credit, municipal bond insurance and Standby Bond
            Purchase Agreements. The Municipal Bond Fund may also invest in
            municipal lease obligations, as well as securities derived from
            Municipal Bonds, such as residual interest bonds and participation
            interests.
 
24
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
              Municipal Bonds are subject to credit and market risk. Credit
            risk relates to the ability of the issuer to make payments of
            principal and interest. The ability of an issuer to make such pay-
            ments could be affected by litigation, legislation or other polit-
            ical events or the bankruptcy of the issuer. Market risk relates
            to changes in a security's value as a result of changes in inter-
            est rates. Lower rated Municipal Bonds generally provide higher
            yields but are subject to greater credit and market risk than
            higher quality Municipal Bonds.
 
REPURCHASE  For the purpose of achieving income, each of the Funds may enter
AGREEMENTS  into repurchase agreements, which entail the purchase of a portfo-
            lio-eligible security from a bank or broker-dealer that agrees to
            repurchase the security at the Fund's cost plus interest within a
            specified time (normally one day). If the party agreeing to repur-
            chase should default, as a result of bankruptcy or otherwise, the
            Fund will seek to sell the securities which it holds, which action
            could involve procedural costs or delays in addition to a loss on
            the securities if their value should fall below their repurchase
            price. No Fund will invest more than 15% of its net assets (10% in
            the case of the Money Market Fund) (taken at current market value)
            in repurchase agreements maturing in more than seven days.
 
 
REVERSE        
REPURCHASE  A reverse repurchase agreement involves the sale of a security by
AGREEMENTS, a Fund and its agreement to repurchase the instrument at a speci-
DOLLAR      fied time and price. Under a reverse repurchase agreement, the
ROLLS, AND  Fund continues to receive any principal and interest payments on
BORROWINGS  the underlying security during the term of the agreement. The Fund
            generally will segregate assets determined to be liquid by the Ad-
            viser in accordance with procedures established by the Board of
            Trustees to cover its obligations under reverse repurchase agree-
            ments and, to this extent, a reverse repurchase agreement (or eco-
            nomically similar transaction) will not be considered a "senior
            security" subject to the 300% asset coverage requirements other-
            wise applicable to borrowings by a Fund.     
               
               A Fund may enter into dollar rolls, in which the Fund sells
            mortgage-backed or other securities for delivery in the current
            month and simultaneously contracts to purchase substantially simi-
            lar securities on a specified future date. In the case of dollar
            rolls involving mortgage-backed securities, the mortgage-backed
            securities that are purchased will be of the same type and will
            have the same interest rate as those sold, but will be supported
            by different pools of mortgages. The Fund forgoes principal and
            interest paid during the roll period on the securities sold in a
            dollar roll, but the Fund is compensated by the difference between
            the current sales price and the lower price for the future pur-
            chase as well as by any interest earned on the proceeds of the se-
            curities sold. The Fund also could be compensated through the re-
            ceipt of fee income equivalent to a lower forward price. The Fund
            will segregate assets determined to be liquid by the Adviser in
            accordance with procedures established by the Board of Trustees to
            cover its obligations under dollar rolls.     
               
               To the extent that positions in reverse repurchase agreements,
            dollar rolls or similar transactions are not covered through the
            maintenance of segregated liquid assets at least equal to the
            amount of any forward purchase commitment, such transactions would
            be subject to the Funds' limitations on borrowings, which would
            restrict the aggregate of such transactions (plus any other
            borrowings) to 33 1/3% (for each Fund except the Global Bond
            Fund II) of such Fund's total assets. Apart from such transac-
            tions, a Fund will not borrow money, except for temporary adminis-
            trative purposes. The Global Bond Fund II may not borrow in excess
            of 10% of the value of its total assets and then only from banks
            as a temporary measure to facilitate the meeting of redemption re-
            quests (not for leverage) or for extraordinary or emergency pur-
            poses.     
 
 
LOANS OF
PORTFOLIO   For the purpose of achieving income, each Fund may lend its port-
SECURITIES  folio securities to brokers, dealers, and other financial institu-
            tions, provided:
                (i) the loan is secured continuously by collateral consisting
                    of U.S. Government securities, cash or cash equivalents
                    (negotiable certificates of deposit, bankers' acceptances
                    or letters of credit) maintained on a daily mark-to-market
                    basis in an amount at least equal to the current market
                    value of the securities loaned;
                (ii) the Fund may at any time call the loan and obtain the re-
                     turn of the securities loaned;
 
                                                                             25
                                                     August 1, 1998 Prospectus
<PAGE>
 
                (iii) the Fund will receive any interest or dividends paid on
                      the loaned securities; and
                (iv) the aggregate market value of securities loaned will not
                     at any time exceed 33 1/3% (25% in the case of the Global
                     Bond Fund II) of the total assets of the Fund.
            Each Fund's performance will continue to reflect changes in the
            value of the securities loaned and will also reflect the receipt
            of either interest, through investment of cash collateral by the
            Fund in permissible investments, or a fee, if the collateral is
            U.S. Government securities. Securities lending involves the risk
            of loss of rights in the collateral or delay in recovery of the
            collateral should the borrower fail to return the security loaned
            or become insolvent. The Funds may pay lending fees to the party
            arranging the loan.
 
 
WHEN-          
ISSUED,     Each of the Funds may purchase or sell securities on a when-is-
DELAYED     sued, delayed delivery, or forward commitment basis. These trans-
DELIVERY    actions involve a commitment by the Fund to purchase or sell secu-
AND FORWARD rities for a predetermined price or yield, with payment and deliv-
COMMITMENT  ery taking place more than seven days in the future, or after a
TRANSACTIONSperiod longer than the customary settlement period for that type
            of security. When such purchases are outstanding, the Fund will
            segregate until the settlement date assets determined to be liquid
            by the Adviser in accordance with procedures established by the
            Board of Trustees, in an amount sufficient to meet the purchase
            price. Typically, no income accrues on securities a Fund has com-
            mitted to purchase prior to the time delivery of the securities is
            made, although a Fund may earn income on securities it has segre-
            gated.     
               When purchasing a security on a when-issued, delayed delivery,
            or forward commitment basis, the Fund assumes the rights and risks
            of ownership of the security, including the risk of price and
            yield fluctuations, and takes such fluctuations into account when
            determining its net asset value. Because the Fund is not required
            to pay for the security until the delivery date, these risks are
            in addition to the risks associated with the Fund's other invest-
            ments. If the Fund remains substantially fully invested at a time
            when when-issued, delayed delivery, or forward commitment pur-
            chases are outstanding, the purchases may result in a form of lev-
            erage.
               
               When the Fund has sold a security on a when-issued, delayed de-
            livery, or forward commitment basis, the Fund does not participate
            in future gains or losses with respect to the security. If the
            other party to a transaction fails to deliver or pay for the secu-
            rities, the Fund could miss a favorable price or yield opportunity
            or could suffer a loss. A Fund may dispose of or renegotiate a
            transaction after it is entered into, and may sell when-issued,
            delayed delivery or forward commitment securities before they are
            delivered, which may result in a capital gain or loss. There is no
            percentage limitation on the extent to which the Funds may pur-
            chase or sell securities on a when-issued, delayed delivery, or
            forward commitment basis.     
 
 
SHORT SALES    
            Each of the Funds (except the High Yield and StocksPLUS Funds) may
            from time to time effect short sales as part of their overall
            portfolio management strategies, including the use of derivative
            instruments, or to offset potential declines in value of long po-
            sitions in similar securities as those sold short. A short sale
            (other than a short sale against the box) is a transaction in
            which a Fund sells a security it does not own at the time of the
            sale in anticipation that the market price of that security will
            decline. To the extent that a Fund engages in short sales, it must
            (except in the case of short sales "against the box") maintain as-
            set coverage in the form of segregated assets determined to be
            liquid by the Adviser in accordance with procedures established by
            the Board of Trustees or otherwise cover its position in a permis-
            sible manner. A short sale is "against the box" to the extent that
            the Fund contemporaneously owns, or has the right to obtain at no
            added cost, securities identical to those sold short. The Global
            Bond Fund II may only engage in short sales that are "against the
            box."     
 
 
FOREIGN
SECURITIES
            Each of the Funds (except the Municipal Bond Fund and the Long-
            Term U.S. Government Fund) may invest directly in fixed income se-
            curities of non-U.S. issuers. The Money Market and High Yield
            Funds may only invest in U.S. dollar-denominated fixed income se-
            curities of non-U.S. issuers. The StocksPLUS Fund may invest di-
            rectly in foreign equity securities.
               Except for the Emerging Markets Bond Fund, each of the Funds
            will concentrate its foreign investments in securities of issuers
            based in developed countries. However, the Short-Term and Low Du-
            ration Funds may each invest
 
26
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            up to 5% of its assets in securities of issuers based in the
            emerging market countries in which the Emerging Markets Bond Fund
            may invest, and each of the remaining Fixed Income Funds that may
            invest in foreign securities may invest up to 10% of its assets in
            such securities.
               Individual foreign economies may differ favorably or unfavor-
            ably from the U.S. economy in such respects as growth of gross do-
            mestic product, rate of inflation, capital reinvestment, re-
            sources, self-sufficiency and balance of payments position. The
            securities markets, values of securities, yields, and risks asso-
            ciated with securities markets in different countries may change
            independently of each other. Investing in the securities of is-
            suers in any foreign country involves special risks and considera-
            tions not typically associated with investing in U.S. companies.
            Shareholders should consider carefully the substantial risks in-
            volved in investing in securities issued by companies and govern-
            ments of foreign nations. These risks include: differences in ac-
            counting, auditing and financial reporting standards; generally
            higher commission rates on foreign portfolio transactions; the
            possibility of nationalization, expropriation or confiscatory tax-
            ation; adverse changes in investment or exchange control regula-
            tions (which may include suspension of the ability to transfer
            currency from a country); and political instability which could
            affect U.S. investments in foreign countries. Additionally, for-
            eign securities and dividends and interest payable on those secu-
            rities may be subject to foreign taxes, including taxes withheld
            from payments on those securities. Foreign securities often trade
            with less frequency and volume than domestic securities and there-
            fore may exhibit greater price volatility. Additional costs asso-
            ciated with an investment in foreign securities may include higher
            custodial fees than apply to domestic custodial arrangements and
            transaction costs of foreign currency conversions. Changes in for-
            eign exchange rates also will affect the value of securities de-
            nominated or quoted in currencies other than the U.S. dollar.
               Certain of the Funds, and particularly the Emerging Markets
            Bond Fund, will invest in the securities of issuers based in coun-
            tries with developing economies. Investing in developing (or
            "emerging market") countries involves certain risks not typically
            associated with investing in U.S. securities, and imposes risks
            greater than, or in addition to, risks of investing in foreign,
            developed countries. A number of emerging market countries re-
            strict, to varying degrees, foreign investment in securities. Re-
            patriation of investment income, capital, and the proceeds of
            sales by foreign investors may require governmental registration
            and/or approval in some emerging market countries. A number of the
            currencies of emerging market countries have experienced signifi-
            cant declines against the U.S. dollar in recent years, and devalu-
            ation may occur subsequent to investments in these currencies by a
            Fund. Inflation and rapid fluctuations in inflation rates have
            had, and may continue to have, negative effects on the economies
            and securities markets of certain emerging market countries. Many
            of the emerging securities markets are relatively small, have low
            trading volumes, suffer periods of relative illiquidity, and are
            characterized by significant price volatility. There is a risk in
            emerging market countries that a future economic or political cri-
            sis could lead to price controls, forced mergers of companies, ex-
            propriation or confiscatory taxation, seizure, nationalization, or
            creation of government monopolies, any of which may have a detri-
            mental effect on a Fund's investment.
               Additional risks of investing in emerging market countries may
            include: currency exchange rate fluctuations; greater social, eco-
            nomic and political uncertainty and instability (including the
            risk of war); more substantial governmental involvement in the
            economy; less governmental supervision and regulation of the secu-
            rities markets and participants in those markets; unavailability
            of currency hedging techniques in certain emerging market coun-
            tries; the fact that companies in emerging market countries may be
            newly organized and may be smaller and less seasoned companies;
            the difference in, or lack of, auditing and financial reporting
            standards, which may result in unavailability of material informa-
            tion about issuers; the risk that it may be more difficult to ob-
            tain and/or enforce a judgment in a court outside the United
            States; and significantly smaller market capitalization of securi-
            ties markets. Also, any change in the leadership or policies of
            Eastern European countries, or the countries that exercise a sig-
            nificant influence over those countries, may halt the expansion of
            or reverse the liberalization of foreign investment policies now
            occurring and adversely affect existing investment opportunities.
               In addition, emerging securities markets may have different
            clearance and settlement procedures, which may be unable to keep
            pace with the volume of securities transactions or otherwise make
            it difficult to engage in such transac-
                                                     August 1, 1998 Prospectus
                                                                              27
<PAGE>
 
            tions. Settlement problems may cause a Fund to miss attractive in-
            vestment opportunities, hold a portion of its assets in cash pend-
            ing investment, or delay in disposing of a portfolio security.
            Such a delay could result in possible liability to a purchaser of
            the security.
               Each of the Fixed Income Funds (except the Municipal Bond and
            Long-Term U.S. Government Funds) may invest in Brady Bonds. Brady
            Bonds are securities created through the exchange of existing com-
            mercial bank loans to sovereign entities for new obligations in
            connection with debt restructurings under a debt restructuring
            plan introduced by former U.S. Secretary of the Treasury, Nicholas
            F. Brady. Brady Bonds have been issued only recently, and for that
            reason do not have a long payment history. Brady Bonds may be col-
            lateralized or uncollateralized, are issued in various currencies
            (but primarily the U.S. dollar), and are actively traded in the
            over-the-counter secondary market. Brady Bonds are not considered
            to be U.S. Government securities. In light of the residual risk of
            Brady Bonds and, among other factors, the history of defaults with
            respect to commercial bank loans by public and private entities in
            countries issuing Brady Bonds, investments in Brady Bonds may be
            viewed as speculative. There can be no assurance that Brady Bonds
            acquired by a Fund will not be subject to restructuring arrange-
            ments or to requests for new credit, which may cause the Fund to
            suffer a loss of interest or principal on any of its holdings. For
            further information, see the Statement of Additional Information.
               Certain of the Funds also may invest in sovereign debt (other
            than Brady Bonds) issued by governments, their agencies or instru-
            mentalities, or other government-related entities located in
            emerging market countries. Holders of sovereign debt may be re-
            quested to participate in the rescheduling of such debt and to ex-
            tend further loans to governmental entities. In addition, there is
            no bankruptcy proceeding by which defaulted sovereign debt may be
            collected.
               A Fund's investments in foreign currency denominated debt obli-
            gations and hedging activities will likely produce a difference
            between its book income and its taxable income. This difference
            may cause a portion of the Fund's income distributions to consti-
            tute returns of capital for tax purposes or require the Fund to
            make distributions exceeding book income to qualify as a regulated
            investment company for federal tax purposes.
 
 
FOREIGN     Foreign currency exchange rates may fluctuate significantly over
CURRENCY    short periods of time. They generally are determined by the forces
TRANSACTIONSof supply and demand in the foreign exchange markets and the rela-
            tive merits of investments in different countries, actual or per-
            ceived changes in interest rates and other complex factors, as
            seen from an international perspective. Currency exchange rates
            also can be affected unpredictably by intervention (or the failure
            to intervene) by U.S. or foreign governments or central banks, by
            currency controls or political developments in the U.S. or abroad.
            For example, significant uncertainty surrounds the proposed intro-
            duction of the euro (a common currency for the European Union) in
            January 1999 and its effect on the value of securities denominated
            in local European currencies. These and other currencies in which
            the Funds' assets are denominated may be devalued against the U.S.
            dollar, resulting in a loss to the Funds.
               All Funds that may invest in securities denominated in foreign
            currencies may buy and sell foreign currencies on a spot and for-
            ward basis to reduce the risks of adverse changes in foreign ex-
            change rates. A forward foreign currency exchange contract in-
            volves an obligation to purchase or sell a specific currency at a
            future date, which may be any fixed number of days from the date
            of the contract agreed upon by the parties, at a price set at the
            time of the contract. By entering into a forward foreign currency
            exchange contract, the Fund "locks in" the exchange rate between
            the currency it will deliver and the currency it will receive for
            the duration of the contract. As a result, a Fund reduces its ex-
            posure to changes in the value of the currency it will deliver and
            increases its exposure to changes in the value of the currency it
            will exchange into. The effect on the value of a Fund is similar
            to selling securities denominated in one currency and purchasing
            securities denominated in another. Contracts to sell foreign cur-
            rency would limit any potential gain which might be realized by a
            Fund if the value of the hedged currency increases. A Fund may en-
            ter into these contracts for the purpose of hedging against for-
            eign exchange risk arising from the Fund's investment or antici-
            pated investment in securities denominated in foreign currencies.
            A Fund also may enter into these contracts for purposes of in-
            creasing exposure to a foreign currency or to shift exposure to
            foreign currency fluctuations from one country to
 
28
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            another. A Fund may use one currency (or a basket of currencies)
            to hedge against adverse changes in the value of another currency
            (or a basket of currencies) when exchange rates between the two
            currencies are positively correlated. Each Fund will segregate as-
            sets determined to be liquid by the Adviser in accordance with
            procedures established by the Board of Trustees, to cover its ob-
            ligations under forward foreign currency exchange contracts en-
            tered into for non-hedging purposes.     
               All Funds that may invest in securities denominated in foreign
            currencies may invest in options on foreign currencies and foreign
            currency futures and options thereon. The Funds also may invest in
            foreign currency exchange-related securities, such as foreign cur-
            rency warrants and other instruments whose return is linked to
            foreign currency exchange rates. Each Fund that may invest in se-
            curities denominated in foreign currencies, except the Emerging
            Markets Bond Fund, will use these techniques to hedge at least 75%
            of its exposure to foreign currency. For a description of these
            instruments, see "Derivative Instruments" below and the Statement
            of Additional Information.
 
 
HIGH YIELD     
SECURITIES  The High Yield Fund invests at least 65% of its assets, and the
("JUNK      Emerging Markets Bond Fund may invest up to 100% of its assets, in
BONDS")     fixed income securities rated lower than Baa by Moody's or lower
            than BBB by S&P but rated at least B by Moody's or S&P (or, if not
            rated, determined by the Adviser to be of comparable quality). In
            addition, each of the Short-Term, Low Duration, Real Return Bond,
            Total Return, Global Bond II, Foreign Bond and StocksPLUS Funds
            may invest up to 10% of its assets in such securities. The Munici-
            pal Bond Fund may invest up to 10% of its assets in securities
            rated lower than Baa by Moody's or BBB by S&P but rated at least
            Ba by Moody's or BB by S&P. Securities rated lower than Baa by
            Moody's or lower than BBB by S&P are sometimes referred to as
            "high yield" or "junk" bonds. Securities rated Baa are considered
            by Moody's to have some speculative characteristics. Investors
            should consider the following risks associated with high yield se-
            curities before investing in these Funds.     
               Investing in high yield securities involves special risks in
            addition to the risks associated with investments in higher rated
            fixed income securities. High yield securities may be regarded as
            predominately speculative with respect to the issuer's continuing
            ability to meet principal and interest payments. Analysis of the
            creditworthiness of issuers of high yield securities may be more
            complex than for issuers of higher quality debt securities, and
            the ability of a Fund to achieve its investment objective may, to
            the extent of its investments in high yield securities, be more
            dependent upon such creditworthiness analysis than would be the
            case if the Fund were investing in higher quality securities.
               High yield securities may be more susceptible to real or per-
            ceived adverse economic and competitive industry conditions than
            higher grade securities. The prices of high yield securities have
            been found to be less sensitive to interest rate changes than more
            highly rated investments, but more sensitive to adverse economic
            downturns or individual corporate developments. A projection of an
            economic downturn or of a period of rising interest rates, for ex-
            ample, could cause a decline in high yield security prices because
            the advent of a recession could lessen the ability of a highly
            leveraged company to make principal and interest payments on its
            debt securities. If the issuer of high yield securities defaults,
            a Fund may incur additional expenses to seek recovery. In the case
            of high yield securities structured as zero coupon or payment-in-
            kind securities, the market prices of such securities are affected
            to a greater extent by interest rate changes, and therefore tend
            to be more volatile than securities which pay interest periodi-
            cally and in cash.
               The secondary markets on which high yield securities are traded
            may be less liquid than the market for higher grade securities.
            Less liquidity in the secondary trading markets could adversely
            affect and cause large fluctuations in the daily net asset value
            of a Fund's shares. Adverse publicity and investor perceptions,
            whether or not based on fundamental analysis, may decrease the
            values and liquidity of high yield securities, especially in a
            thinly traded market.
               
               The use of credit ratings as the sole method of evaluating high
            yield securities can involve certain risks. For example, credit
            ratings evaluate the safety of principal and interest payments,
            not the market value risk of high yield securities. Also, credit
            rating agencies may fail to change credit ratings in a timely
            fashion to reflect events since the security was last rated. The
            Adviser does not rely solely on credit ratings when selecting se-
            curities for the Funds, and develops its own independent analysis
            of issuer credit quality. If a credit rating agency changes the
            rating of a portfolio security held by a Fund, the Fund may retain
            the portfolio security if the Adviser deems it in the best inter-
            est of shareholders.     
                                                     August 1, 1998 Prospectus
                                                                              29
<PAGE>
 
               
               During the year ended March 31, 1998, based upon the dollar-
            weighted average ratings of the Funds' portfolio holdings at the
            end of each month in the Funds' fiscal year, each operational Fund
            that may invest greater than 5% of its assets in securities rated
            below investment grade had the following percentages of its net
            assets invested in securities rated in the categories indicated as
            rated by Moody's (or, if unrated, determined by the Adviser to be
            of comparable quality). See "Appendix B--Description of Securities
            Ratings," for further information.     
 
 
              FIXED INCOME SECURITIES RATINGS
 
<TABLE>   
<CAPTION>
                                                          BELOW
           FUND                   PRIME 1 AAA  AA    A   PRIME 1 BAA  BA    B
              -----------------------------------------------------------------
           <S>                    <C>     <C>  <C>  <C>  <C>     <C>  <C>  <C>
           SHORT-TERM                17%   35%   2%  15%    16%    9%   6%   0%
              -----------------------------------------------------------------
           LOW DURATION               6    75    1    1      5     7    5    0
              -----------------------------------------------------------------
           TOTAL RETURN              20    47    0   13      6     8    6    0
              -----------------------------------------------------------------
           HIGH YIELD                 5     2    0    0      2     6   43   42
              -----------------------------------------------------------------
           GLOBAL BOND II            65    21    3    6      0     2    3    0
              -----------------------------------------------------------------
           FOREIGN BOND              54    31    4    2      1     2    6    0
              -----------------------------------------------------------------
           EMERGING MARKETS BOND     16    14    0    0      0    18   47    5
              -----------------------------------------------------------------
           STOCKSPLUS                26    38    1   10     11     7    7    0
</TABLE>    
               
               These figures are intended solely to provide disclosure about
            each Fund's asset composition during its most recent fiscal year.
            The asset composition after this time may or may not be approxi-
            mately the same as represented by such figures. In addition, the
            categories reflect ratings by Moody's, and ratings assigned by S&P
            may not be consistent with ratings assigned by Moody's or other
            credit ratings services, and the Adviser may not necessarily agree
            with a rating assigned by any credit rating agency.     
 
 
DERIVATIVE     
INSTRUMENTS To the extent permitted by the investment objectives and policies
            of the Funds, the Funds may (except the Money Market Fund) pur-
            chase and write call and put options on securities, securities in-
            dexes and foreign currencies, and enter into futures contracts and
            use options on futures contracts as further described below. The
            Funds (except the Money Market Fund and the Municipal Bond Fund)
            also may enter into swap agreements with respect to foreign cur-
            rencies, interest rates, and securities indexes. The Funds may use
            these techniques to hedge against changes in interest rates, for-
            eign currency exchange rates or securities prices or as part of
            their overall investment strategies. The Funds (except the Money
            Market Fund and the Municipal Bond Fund) may also purchase and
            sell options relating to foreign currencies for purposes of in-
            creasing exposure to a foreign currency or to shift exposure to
            foreign currency fluctuations from one country to another. Each
            Fund will segregate assets determined to be liquid by the Adviser
            in accordance with procedures established by the Board of Trustees
            (or, as permitted by applicable regulation, enter into certain
            offsetting positions) to cover its obligations under options,
            futures, and swaps to limit leveraging of the Fund.     
               
               Derivative instruments are considered for these purposes to
            consist of securities or other instruments whose value is derived
            from or related to the value of some other instrument or asset,
            and not to include those securities whose payment of principal
            and/or interest depends upon cash flows from underlying assets,
            such as mortgage-related or asset-backed securities. Each Fund
            (except the Money Market Fund and the Municipal Bond Fund) may in-
            vest all of its assets in derivative instruments, subject only to
            the Fund's investment objective and policies. The value of some
            derivative instruments in which the Funds invest may be particu-
            larly sensitive to changes in prevailing interest rates, and, like
            the other investments of the Funds, the ability of a Fund to suc-
            cessfully utilize these instruments may depend in part upon the
            ability of the Adviser to forecast interest rates and other eco-
            nomic factors correctly. If the Adviser incorrectly forecasts such
            factors and has taken positions in derivative instruments contrary
            to prevailing market trends, the Funds could be exposed to the
            risk of loss.     
 
30
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
               The Funds might not employ any of the strategies described be-
            low, and no assurance can be given that any strategy used will
            succeed. If the Adviser incorrectly forecasts interest rates, mar-
            ket values or other economic factors in utilizing a derivatives
            strategy for a Fund, the Fund might have been in a better position
            if it had not entered into the transaction at all. The use of
            these strategies involves certain special risks, including a pos-
            sible imperfect correlation, or     
            even no correlation, between price movements of derivative instru-
            ments and price movements of related investments. While some
            strategies involving derivative instruments can reduce the risk of
            loss, they can also reduce the opportunity for gain or even result
            in losses by offsetting favorable price movements in related in-
            vestments or otherwise, due to the possible inability of a Fund to
            purchase or sell a portfolio security at a time that otherwise
            would be favorable or the possible need to sell a portfolio secu-
            rity at a disadvantageous time because the Fund is required to
            maintain asset coverage or offsetting positions in connection with
            transactions in derivative instruments, and the possible inability
            of a Fund to close out or to liquidate its derivatives positions.
 
            OPTIONS ON SECURITIES, SECURITIES INDEXES, AND CURRENCIES A Fund
            may purchase put options on securities and indexes. One purpose of
            purchasing put options is to protect holdings in an underlying or
            related security against a substantial decline in market value. A
            Fund may also purchase call options on securities and indexes. One
            purpose of purchasing call options is to protect against substan-
            tial increases in prices of securities the Fund intends to pur-
            chase pending its ability to invest in such securities in an or-
            derly manner. An option on a security (or index) is a contract
            that gives the holder of the option, in return for a premium, the
            right to buy from (in the case of a call) or sell to (in the case
            of a put) the writer of the option the security underlying the op-
            tion (or the cash value of the index) at a specified exercise
            price at any time during the term of the option. The writer of an
            option on a security has the obligation upon exercise of the op-
            tion to deliver the underlying security upon payment of the exer-
            cise price or to pay the exercise price upon delivery of the un-
            derlying security. Upon exercise, the writer of an option on an
            index is obligated to pay the difference between the cash value of
            the index and the exercise price multiplied by the specified mul-
            tiplier for the index option. An index is designed to reflect
            specified facets of a particular financial or securities market, a
            specific group of financial instruments or securities, or certain
            economic indicators.
               A Fund may sell put or call options it has previously pur-
            chased, which could result in a net gain or loss depending on
            whether the amount realized on the sale is more or less than the
            premium and other transaction costs paid on the put or call option
            which is sold. A Fund may write a call or put option only if the
            option is "covered" by the Fund holding a position in the under-
            lying securities or by other means which would permit immediate
            satisfaction of the Fund's obligation as writer of the option.
            Prior to exercise or expiration, an option may be closed out by an
            offsetting purchase or sale of an option of the same series.
               The Funds may write covered straddles consisting of a combina-
            tion of a call and a put written on the same underlying security.
            A straddle will be covered when sufficient assets are deposited to
            meet the Funds' immediate obligations. The Funds may use the same
            liquid assets to cover both the call and put options where the ex-
            ercise price of the call and put are the same, or the exercise
            price of the call is higher than that of the put. In such cases,
            the Funds will also segregate liquid assets equivalent to the
            amount, if any, by which the put is "in the money."
               The purchase and writing of options involves certain risks.
            During the option period, the covered call writer has, in return
            for the premium on the option, given up the opportunity to profit
            from a price increase in the underlying security above the exer-
            cise price, but, as long as its obligation as a writer continues,
            has retained the risk of loss should the price of the underlying
            security decline. The writer of an option has no control over the
            time when it may be required to fulfill its obligation as a writer
            of the option. Once an option writer has received an exercise no-
            tice, it cannot effect a closing purchase transaction in order to
            terminate its obligation under the option and must deliver the un-
            derlying security at the exercise price. If a put or call option
            purchased by the Fund is not sold when it has remaining value, and
            if the market price of the underlying security remains equal to or
            greater than the exercise price (in the case of a put), or remains
            less than or equal to the exercise price (in the case of a call),
            the Fund will lose its entire investment in the option. Also,
            where a put or call option on a particular security is purchased
            to hedge against price movements in a related security,
 
                                                                             31
                                                    August 1, 1998 Prospectus
<PAGE>
 
            the price of the put or call option may move more or less than the
            price of the related security. There can be no assurance that a
            liquid market will exist when a Fund seeks to close out an option
            position. Furthermore, if trading restrictions or suspensions are
            imposed on the options markets, a Fund may be unable to close out
            a position.
               Funds that invest in foreign currency-denominated securities
            may buy or sell put and call options on foreign currencies. Cur-
            rency options traded on U.S. or other exchanges may be subject to
            position limits which may limit the ability of a Fund to reduce
            foreign currency risk using such options.
               Over-the-counter options in which certain Funds may invest dif-
            fer from traded options in that they are two-party contracts, with
            price and other terms negotiated between buyer and seller, and
            generally do not have as much market liquidity as exchange-traded
            options. The Funds may be required to treat as illiquid over-the-
            counter options purchased and securities being used to cover cer-
            tain written over-the-counter options.
 
            SWAP AGREEMENTS The Funds (except the Money Market Fund and the
            Municipal Bond Fund) may enter into interest rate, index, equity
            and currency exchange rate swap agreements. These transactions
            would be entered into in an attempt to obtain a particular return
            when it is considered desirable to do so, possibly at a lower cost
            to the Fund than if the Fund had invested directly in the asset
            that yielded the desired return. Swap agreements are two-party
            contracts entered into primarily by institutional investors for
            periods ranging from a few weeks to more than one year. In a stan-
            dard swap transaction, two parties agree to exchange the returns
            (or differentials in rates of return) earned or realized on par-
            ticular predetermined investments or instruments, which may be ad-
            justed for an interest factor. The gross returns to be exchanged
            or "swapped" between the parties are generally calculated with re-
            spect to a "notional amount," i.e., the return on or increase in
            value of a particular dollar amount invested at a particular in-
            terest rate, in a particular foreign currency, or in a "basket" of
            securities representing a particular index. Forms of swap agree-
            ments include interest rate caps, under which, in return for a
            premium, one party agrees to make payments to the other to the ex-
            tent that interest rates exceed a specified rate, or "cap"; inter-
            est rate floors, under which, in return for a premium, one party
            agrees to make payments to the other to the extent that interest
            rates fall below a specified level, or "floor"; and interest rate
            collars, under which a party sells a cap and purchases a floor or
            vice versa in an attempt to protect itself against interest rate
            movements exceeding given minimum or maximum levels.
               
               Most swap agreements entered into by the Funds calculate the
            obligations of the parties to the agreement on a "net basis." Con-
            sequently, a Fund's current obligations (or rights) under a swap
            agreement will generally be equal only to the net amount to be
            paid or received under the agreement based on the relative values
            of the positions held by each party to the agreement (the "net
            amount"). A Fund's current obligations under a swap agreement will
            be accrued daily (offset against amounts owed to the Fund), and
            any accrued but unpaid net amounts owed to a swap counterparty
            will be covered by the segregation of assets determined to be liq-
            uid by the Adviser in accordance with procedures established by
            the Board of Trustees, to limit any potential leveraging of the
            Fund's portfolio. Obligations under swap agreements so covered
            will not be construed to be "senior securities" for purposes of
            the Funds' investment restriction concerning senior securities. A
            Fund will not enter into a swap agreement with any single party if
            the net amount owed or to be received under existing contracts
            with that party would exceed 5% of the Fund's assets.     
               
               Whether a Fund's use of swap agreements will be successful in
            furthering its investment objective will depend on the Adviser's
            ability to predict correctly whether certain types of investments
            are likely to produce greater returns than other investments. Be-
            cause they are two-party contracts and because they may have terms
            of greater than seven days, swap agreements may be considered to
            be illiquid investments. Moreover, a Fund bears the risk of loss
            of the amount expected to be received under a swap agreement in
            the event of the default or bankruptcy of a swap agreement
            counterparty. The Funds will enter into swap agreements only with
            counterparties that meet certain standards for creditworthiness
            (generally, such counterparties would have to be eligible
            counterparties under the terms of the Funds' repurchase agreement
            guidelines). Certain restrictions imposed on the Funds by the In-
            ternal Revenue Code may limit the Funds' ability to use swap
            agreements. The swaps market is a relatively new market and is
            largely unregulated. It is     
 
32
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            possible that developments in the swaps market, including poten-
            tial government regulation, could adversely affect a Fund's abil-
            ity to terminate existing swap agreements or to realize amounts to
            be received under such agreements.
 
            FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS Each of the
            Fixed Income Funds (except the Money Market Fund and the Municipal
            Bond Fund) may invest in interest rate futures contracts and op-
            tions thereon ("futures options"), and to the extent it may invest
            in foreign currency-denominated securities, may also invest in
            foreign currency futures contracts and options thereon. The Munic-
            ipal Bond Fund may purchase and sell futures contracts on U.S.
            Government securities and Municipal Bonds, as well as purchase put
            and call options on such futures contracts. The StocksPLUS Fund
            may invest in interest rate, stock index and foreign currency
            futures contracts and options thereon.
               There are several risks associated with the use of futures and
            futures options for hedging purposes. There can be no guarantee
            that there will be a correlation between price movements in the
            hedging vehicle and in the portfolio securities being hedged. An
            incorrect correlation could result in a loss on both the hedged
            securities in a Fund and the hedging vehicle, so that the portfo-
            lio return might have been greater had hedging not been attempted.
            There can be no assurance that a liquid market will exist at a
            time when a Fund seeks to close out a futures contract or a
            futures option position. Most futures exchanges and boards of
            trade limit the amount of fluctuation permitted in futures con-
            tract prices during a single day; once the daily limit has been
            reached on a particular contract, no trades may be made that day
            at a price beyond that limit. In addition, certain of these in-
            struments are relatively new and without a significant trading
            history. As a result, there is no assurance that an active second-
            ary market will develop or continue to exist. Lack of a liquid
            market for any reason may prevent a Fund from liquidating an unfa-
            vorable position, and the Fund would remain obligated to meet mar-
            gin requirements until the position is closed.
               The Funds may write covered straddles consisting of a call and
            a put written on the same underlying futures contract. A straddle
            will be covered when sufficient assets are deposited to meet the
            Funds' immediate obligations. A Fund may use the same liquid as-
            sets to cover both the call and put options where the exercise
            price of the call and put are the same, or the exercise price of
            the call is higher than that of the put. In such cases, the Funds
            will also segregate liquid assets equivalent to the amount, if
            any, by which the put is "in the money."
               The Funds will only enter into futures contracts or futures op-
            tions which are standardized and traded on a U.S. or foreign ex-
            change or board of trade, or similar entity, or quoted on an auto-
            mated quotation system. Each Fund will use financial futures con-
            tracts and related options only for "bona fide hedging" purposes,
            as such term is defined in applicable regulations of the CFTC or,
            with respect to positions in financial futures and related options
            that do not qualify as "bona fide hedging" positions, will enter
            such positions only to the extent that aggregate initial margin
            deposits plus premiums paid by it for open futures option posi-
            tions, less the amount by which any such positions are "in-the-
            money," would not exceed 5% of the Fund's net assets.
 
 
HYBRIDINSTRUMENTS
            A hybrid instrument can combine the characteristics of securities,
            futures, and options. For example, the principal amount or
            interest rate of a hybrid could be tied (positively or negatively)
            to the price of some commodity, currency or securities index or
            another interest rate (each a "benchmark"). The interest rate or
            (unlike most fixed income securities) the principal amount payable
            at maturity of a hybrid security may be increased or decreased,
            depending on changes in the value of the benchmark.
               Hybrids can be used as an efficient means of pursuing a variety
            of investment goals, including currency hedging, duration manage-
            ment, and increased total return. Hybrids may not bear interest or
            pay dividends. The value of a hybrid or its interest rate may be a
            multiple of a benchmark and, as a result, may be leveraged and
            move (up or down) more steeply and rapidly than the benchmark.
            These benchmarks may be sensitive to economic and political
            events, such as commodity shortages and currency devaluations,
            which cannot be readily foreseen by the purchaser of a hybrid. Un-
            der certain conditions, the redemption value of a hybrid could be
            zero. Thus, an investment in a hybrid may entail significant mar-
            ket risks that are not associated with a similar investment in a
            traditional, U.S. dollar-denominated bond that
 
                                                                             33
                                                     August 1, 1998 Prospectus
<PAGE>
 
            has a fixed principal amount and pays a fixed rate or floating
            rate of interest. The purchase of hybrids also exposes a Fund to
            the credit risk of the issuer of the hybrids. These risks may
            cause significant fluctuations in the net asset value of the Fund.
            Accordingly, no Fund will invest more than 5% of its assets in hy-
            brid instruments.
               Certain issuers of structured products such as hybrid instru-
            ments may be deemed to be investment companies as defined in the
            1940 Act. As a result, the Funds' investments in these products
            will be subject to limits applicable to investments in investment
            companies and may be subject to restrictions contained in the 1940
            Act.
            
CATASTROPHE Each of the Fixed Income Funds (except the Money Market Fund) and
BONDS       the StocksPLUS Fund may invest in "catastrophe bonds." Catastrophe
            bonds are fixed income securities, for which the return of princi-
            pal and payment of interest is contingent on the non-occurrence of
            a specific "trigger" catastrophic event, such as a hurricane or an
            earthquake. They may be issued by government agencies, insurance
            companies, reinsurers, special purpose corporations or other on-
            shore or off-shore entities. If a trigger event causes losses ex-
            ceeding a specific amount in the geographic region and time period
            specified in a bond, a Fund investing in the bond may lose a por-
            tion or all of its principal invested in the bond. If no trigger
            event occurs, the Fund will recover its principal plus interest.
            For some catastrophe bonds, the trigger event or losses may be
            based on companywide losses, index-portfolio losses, industry in-
            dices, or readings of scientific instruments rather than specified
            actual losses. Often the catastrophe bonds provide for extensions
            of maturity that are mandatory, or optional at the discretion of
            the issuer, in order to process and audit loss claims in those
            cases where a trigger event has, or possibly has, occurred. In ad-
            dition to the specified trigger events, catastrophe bonds may also
            expose the Fund to certain unanticipated risks including but not
            limited to issuer (credit) default, adverse regulatory or juris-
            dictional interpretations, and adverse tax consequences.     
               
               Catastrophe bonds are a relatively new type of financial in-
            strument. As such, there is no significant trading history of
            these securities, and there can be no assurance that a liquid mar-
            ket in these instruments will develop. See "Illiquid Securities"
            below. Lack of a liquid market may impose the risk of higher
            transaction costs and the possibility that a Fund may be forced to
            liquidate positions when it would not be advantageous to do so.
            Catastrophe bonds are typically rated, and a Fund will only invest
            in catastrophe bonds that meet the credit quality requirements for
            the Fund.     
 
 
 
INVESTMENT  Each of the Funds may invest in securities of other investment
IN          companies, such as closed-end management investment companies, or
INVESTMENT  in pooled accounts or other investment vehicles. As a shareholder
COMPANIES   of an investment company, a Fund may indirectly bear service and
            other fees which are in addition to the fees the Fund pays its
            service providers.
 
 
PORTFOLIO   The length of time a Fund has held a particular security is not
TURNOVER    generally a consideration in investment decisions. The investment
            policies of a Fund may lead to frequent changes in the Fund's in-
            vestments, particularly in periods of volatile market movements.
            High portfolio turnover (e.g., over 100%) involves correspondingly
            greater expenses to a Fund, including commissions or dealer mark-
            ups and other transaction costs on the sale of securities and
            reinvestments in other securities. See "Management of the Trust--
            Portfolio Transactions." Such sales may result in realization of
            taxable capital gains. See "Taxes." The portfolio turnover rate
            for certain of the Funds is set forth under "Financial High-
            lights." The portfolio turnover rate for certain of the Funds,
            which offer Institutional or Administrative Class shares, is in-
            corporated by reference in the Statement of Additional Informa-
            tion.
 
 
ILLIQUID
SECURITIES     
            Each of the Funds may invest up to 15% of its net assets in illiq-
            uid securities (10% in the case of the Money Market Fund). Certain
            illiquid securities may require pricing at fair value as deter-
            mined in good faith under the supervision of the Board of Trust-
            ees. The Adviser may be subject to significant delays in disposing
            of illiquid securities, and transactions in illiquid securities
            may entail registration expenses and other transaction costs that
            are higher than those for transactions in liquid securities. The
            term "illiquid securities" for this purpose means securities that
            cannot be disposed of within seven days in the ordinary course of
            business at approximately the amount at which a Fund has valued
            the     
 
34
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            securities. Illiquid securities are considered to include, among
            other things, written over-the-counter options, securities or
            other liquid assets being used as cover for such options, repur-
            chase agreements with maturities in excess of seven days, certain
            loan participation interests, fixed time deposits which are not
            subject to prepayment or provide for withdrawal penalties upon
            prepayment (other than overnight deposits), securities that are
            subject to legal or contractual restrictions on resale and other
            securities which legally or in the Adviser's opinion may be deemed
            illiquid (not including securities issued pursuant to Rule 144A
            under the Securities Act of 1933 and certain commercial paper that
            Pacific Investment Management has determined to be liquid under
            procedures approved by the Board of Trustees).     
               Illiquid securities may include privately placed securities,
            which are sold directly to a small number of investors, usually
            institutions. Unlike public offerings, such securities are not
            registered under the federal securities laws. Although certain of
            these securities may be readily sold, for example, under Rule
            144A, others may be illiquid, and their sale may involve substan-
            tial delays and additional costs.
 
 
SERVICE        
SYSTEMS--   Many of the services provided to the Funds depend on the smooth
YEAR 2000   functioning of computer systems. Many systems in use today cannot
PROBLEM     distinguish between the year 1900 and the year 2000. Should any of
            the service systems fail to process information properly, that
            could have an adverse impact on the Funds' operations and services
            provided to shareholders. The Adviser, Distributor, Shareholder
            Servicing and Transfer Agent, Custodian, and certain other service
            providers to the Funds have reported that each is working toward
            mitigating the risks associated with the so-called "year 2000
            problem." However, there can be no assurance that the problem will
            be corrected in all respects and that the Funds' operations and
            services provided to shareholders will not be adversely affected.
                
            Performance Information
               
            From time to time the Trust may make available certain information
            about the performance of the Class A, Class B and Class C shares
            of some or all of the Funds. Information about a Fund's perfor-
            mance is based on that Fund's (or its predecessor's) record to a
            recent date and is not intended to indicate future performance.
            Performance information is computed separately for each Fund's
            Class A, Class B and Class C shares in accordance with the formu-
            las described below. Because Class B and Class C shares bear the
            expense of the distribution fee attending the deferred sales
            charge (Class B) and asset based sales charge (Class C) alterna-
            tives and certain other expenses, it is expected that, under nor-
            mal circumstances, the yield and the level of performance of a
            Fund's Class B and Class C shares will be lower than that of the
            Fund's Class A shares although an investment in Class B or Class C
            shares is not reduced by the front-end sales charge generally ap-
            plicable to an investment in Class A shares.     
               From time to time, the yield and total return for each class of
            shares of the Funds may be included in advertisements or reports
            to shareholders or prospective investors. Yield quotations for the
            Money Market Fund may include current yield and effective yield.
            Current yield will be based on income received by a hypothetical
            investment over a given seven-day period (less expenses accrued
            during the period) and "annualized" (i.e., assuming that the sev-
            en-day yield would be received for 52 weeks, stated in terms of an
            annual percentage return on the investment). Effective yield for
            the Fund is calculated in the manner similar to that used to cal-
            culate current yield, but reflects the compounding effect on earn-
            ings of reinvested dividends. For the remaining Funds, quotations
            of yield for a Fund or class will be based on the investment in-
            come per share (as defined by the Securities and Exchange Commis-
            sion) during a particular 30-day (or one-month) period (including
            dividends and interest), less expenses accrued during the period
            ("net investment income"), and will be computed by dividing net
            investment income by the maximum public offering price per share
            on the last day of the period. The tax equivalent yield of the Mu-
            nicipal Bond Fund's Class A, Class B and Class C shares may also
            be advertised, calculated like yield except that, for any given
            tax bracket, net investment income will be calculated as the sum
            of (i) any taxable income of the class plus (ii) the tax exempt
            income of the class divided by the difference between 1 and the
            effective federal income tax rates for taxpayers in that tax
            bracket.
 
                                                                             35
                                                     August 1, 1998 Prospectus
<PAGE>
 
               
               The total return of Class A, Class B and/or Class C shares of
            all Funds may be included in advertisements or other written mate-
            rial. When a Fund's total return is advertised with respect to its
            Class A, Class B and Class C shares, it will be calculated for the
            past year, the past five years, and the past ten years (or if the
            Fund has been offered for a period shorter than one, five or ten
            years, that period will be substituted) since the establishment of
            the Fund (or its predecessor series of PIMCO Advisors Funds for
            the Global Bond Fund II), as more fully described in the Statement
            of Additional Information. For periods prior to the initial offer-
            ing date of a particular class of shares, total return presenta-
            tions for the class will be based on the historical performance of
            an older class of the Fund (if any) restated to reflect current
            sales charges (if any) of the newer class. The older class to be
            used in each case is set forth in the Statement of Additional In-
            formation. For these purposes, the performance of the older class
            will also be restated to reflect any different operating expenses
            (such as different administrative fees and/or 12b-1/servicing fee
            charges) associated with the newer class. In certain cases, such a
            restatement will result in performance of the newer class which is
            higher than if the performance of the older class were not re-
            stated to reflect the different operating expenses of the newer
            class. In such cases, the Trust's advertisements will also, to the
            extent appropriate, show the lower performance figure reflecting
            the actual operating expenses incurred by the older class for pe-
            riods prior to the initial offering date of the newer class. Total
            return for each class is measured by comparing the value of an in-
            vestment in the Fund at the beginning of the relevant period (in
            the case of Class A shares, giving effect to the maximum initial
            sales charge) to the redemption value of the investment in the
            Fund at the end of the period (assuming immediate reinvestment of
            any dividends or capital gains distributions at net asset value
            and giving effect to the deduction of the maximum CDSC which would
            be payable). Total return may be advertised using alternative
            methods that reflect all elements of return, but that may be ad-
            justed to reflect the cumulative impact of alternative fee and ex-
            pense structures, such as the currently effective advisory and ad-
            ministrative fees for the Funds.     
               The Funds may also provide current distribution information to
            its shareholders in shareholder reports or other shareholder com-
            munications, or in certain types of sales literature provided to
            prospective investors. Current distribution information for a par-
            ticular class of a Fund will be based on distributions for a spec-
            ified period (i.e., total dividends from net investment income),
            divided by the relevant class net asset value per share on the
            last day of the period and annualized. The rate of current distri-
            butions does not reflect deductions for unrealized losses from
            transactions in derivative instruments such as options and
            futures, which may reduce total return. Current distribution rates
            differ from standardized yield rates in that they represent what a
            class of a Fund has declared and paid to shareholders as of the
            end of a specified period rather than the Fund's actual net in-
            vestment income for that period.
               
               Performance information for the Trust may also be compared to
            various unmanaged indexes, such as the Standard & Poor's 500 Com-
            posite Stock Price Index, the Lehman Brothers Aggregate Bond In-
            dex, the Lehman Brothers Mortgage-Backed Securities Index, the
            Merrill Lynch 1 to 3 Year Treasury Index, the Lehman Intermediate
            and 20+ Year Treasury Blend Index, the Lehman BB Intermediate Cor-
            porate Index, indexes prepared by Lipper Analytical Services, the
            J.P. Morgan Global Index, the J.P. Morgan Emerging Markets Bond
            Index Plus, the Salomon Brothers World Government Bond Index-10
            Non U.S.-Dollar Hedged and the J.P. Morgan Government Bond Index
            Non U.S.-Dollar Hedged, and other entities or organizations which
            track the performance of investment companies or investment advis-
            ers. Unmanaged indexes (i.e., other than Lipper) generally do not
            reflect deductions for administrative and management costs and ex-
            penses. The Adviser may also report to shareholders or to the pub-
            lic in advertisements concerning the performance of the Adviser as
            adviser to clients other than the Trust, and on the comparative
            performance or standing of the Adviser in relation to other money
            managers. Such comparative information may be compiled or provided
            by independent ratings services or by news organizations. Any per-
            formance information, whether related to the Funds or to the Ad-
            viser, should be considered in light of the Funds' investment ob-
            jectives and policies, characteristics and quality of the Funds'
            portfolios, and the market conditions during the time period indi-
            cated, and should not be considered to be representative of what
            may be achieved in the future. For a description of the methods
            used to determine yield and total return for the Funds, see the
            Statement of Additional Information.     
 
36
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               Investment results of the Funds will fluctuate over time, and
            any presentation of the Funds' total return or yield for any prior
            period should not be considered as a representation of what an in-
            vestor's total return or yield may be in any future period.
 
            How to Buy Shares
 
            Class A, Class B and Class C shares of each Fund of the Trust are
            continuously offered through the Trust's principal underwriter,
            PIMCO Funds Distributors LLC (the "Distributor"), and through
            other firms which have dealer agreements with the Distributor
            ("participating brokers") or which have agreed to act as introduc-
            ing brokers for the Distributor ("introducing brokers").
               There are two ways to purchase Class A, Class B or Class C
            shares: either 1) through your dealer or broker which has a dealer
            agreement with the Distributor; or 2) directly by mailing a PIMCO
            Funds account application (the "account application") with pay-
            ment, as described below under the heading Direct Investment, to
            the Distributor (if no dealer is named in the account application,
            the Distributor may act as dealer).
               Each Fund currently offers and sells three classes of shares in
            this Prospectus (Class A, Class B and Class C). Shares may be pur-
            chased at a price equal to their net asset value per share next
            determined after receipt of an order, plus a sales charge which,
            at the election of the purchaser, may be imposed either (i) at the
            time of the purchase in the case of Class A shares (the "initial
            sales charge alternative"), (ii) on a contingent deferred basis in
            the case of Class B shares (the "deferred sales charge alterna-
            tive"), or (iii) by the deduction of an ongoing asset based sales
            charge in the case of Class C shares (the "asset based sales
            charge alternative"). In certain circumstances, Class A and Class
            C shares are also subject to a CDSC. See "Alternative Purchase Ar-
            rangements." Purchase payments for Class B and Class C shares are
            fully invested at the net asset value next determined after ac-
            ceptance of the trade. Purchase payments for Class A shares, less
            the applicable sales charge, are invested at the net asset value
            next determined after acceptance of the trade.
               All purchase orders received by the Distributor prior to the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            New York Stock Exchange (the "Exchange"), on a regular business
            day, are processed at that day's offering price. However, orders
            received by the Distributor from dealers or brokers after the of-
            fering price is determined that day will receive such offering
            price if the orders were received by the dealer or broker from its
            customer prior to such determination and were transmitted to and
            received by the Distributor prior to its close of business that
            day (normally 5:00 p.m., Eastern time) or, in the case of certain
            retirement plans, received by the Distributor prior to 9:30 a.m.,
            Eastern time on the next business day. Purchase orders received on
            other than a regular business day will be executed on the next
            succeeding regular business day. The Distributor, in its sole dis-
            cretion, may accept or reject any order for purchase of Fund
            shares. The sale of shares will be suspended during any period in
            which the Exchange is closed for other than weekends or holidays,
            or if permitted by the rules of the Securities and Exchange Com-
            mission, when trading on the Exchange is restricted or during an
            emergency which makes it impracticable for the Funds to dispose of
            their securities or to determine fairly the value of their net as-
            sets, or during any other period as permitted by the Securities
            and Exchange Commission for the protection of investors.
               Except for purchases through the PIMCO Funds Auto-Invest plan,
            the PIMCO Funds Auto-Exchange plan, investments pursuant to the
            Uniform Gifts to Minors Act, and tax-qualified and wrap programs
            referred to below under "Tax-Qualified Retirement Plans" and
            "Sales at Net Asset Value", the minimum initial investment in
            Class A, Class B or Class C shares of any Fund of the Trust or any
            series of PIMCO Funds: Multi-Manager Series is $2,500, and the
            minimum additional investment is $100 per Fund. For information
            about dealer commissions, see "Alternative Purchase Arrangements"
            below. Persons selling Fund shares may receive different compensa-
            tion for selling Class A, Class B or Class C shares. Normally,
            Fund shares purchased through participating brokers are held in
            the investor's account with that broker. No share certificates
            will be issued unless specifically requested in writing by an in-
            vestor or broker-dealer.
 
                                                     August 1, 1998 Prospectus
                                                                              37
<PAGE>
 
 
DIRECT      Investors who wish to invest in Class A, Class B or Class C shares
INVESTMENT  of the Trust directly, rather than through a participating broker,
            may do so by opening an account with the Distributor. To open an
            account, an investor should complete the account application. All
            shareholders who open direct accounts with the Distributor will
            receive from the Distributor individual confirmations of each pur-
            chase, redemption, dividend reinvestment, exchange or transfer of
            Trust shares, including the total number of Trust shares owned as
            of the confirmation date, except that purchases which result from
            the reinvestment of daily-accrued dividends and/or distributions
            will be confirmed once each calendar quarter. See "Distributions"
            below. Information regarding direct investment or any other fea-
            tures or plans offered by the Trust may be obtained by calling the
            Distributor at 800-426-0107 or by calling your broker.
 
 
PURCHASE BY Investors who wish to invest directly may send a check payable to
MAIL        PIMCO Funds Distributors LLC, along with a completed application
            form to:
 
               PIMCO Funds Distributors LLC
               P.O. Box 5866
               Denver, CO 80217-5866
 
               Purchases are accepted subject to collection of checks at full
            value and conversion into federal funds. Payment by a check drawn
            on any member of the Federal Reserve System can normally be con-
            verted into federal funds within two business days after receipt
            of the check. Checks drawn on a non-member bank may take up to 15
            days to convert into federal funds. In all cases, the purchase
            price is based on the net asset value next determined after the
            purchase order and check are accepted, even though the check may
            not yet have been converted into federal funds.
 
 
SUBSEQUENT  Subsequent purchases of Class A, Class B or Class C shares can be
PURCHASES   made as indicated above by mailing a check with a letter describ-
OF SHARES   ing the investment or with the additional investment portion of a
            confirmation statement. Except for subsequent purchases through
            the PIMCO Funds Auto-Invest plan, the PIMCO Funds Auto-Exchange
            plan, tax-qualified programs and PIMCO Funds Fund Link referred to
            below, and except during periods when an Automatic Withdrawal plan
            is in effect, the minimum subsequent purchase is $100 in any Fund.
            All payments should be made payable to PIMCO Funds Distributors
            LLC and should clearly indicate the shareholder's account number.
            Checks should be mailed to the address above under "Purchase by
            Mail."
 
 
TAX-        The Distributor makes available retirement plan services and docu-
QUALIFIED   ments for Individual Retirement Accounts (IRAs), including Roth
RETIREMENT  IRAs, for which First National Bank of Boston serves as trustee
PLANS       and for IRA accounts established with Form 5305-SIMPLE under the
            Internal Revenue Code. These accounts include Simplified Employee
            Pension Plan (SEP) and Salary Reduction Simplified Employee Pen-
            sion Plan (SAR/SEP) IRA accounts and prototype documents. In addi-
            tion, prototype documents are available for establishing 403(b)(7)
            Custodial Accounts with First National Bank of Boston as custodi-
            an. This type of plan is available to employees of certain non-
            profit organizations.
               The Distributor also makes available prototype documents for
            establishing Money Purchase and/or Profit Sharing Plans and 401(k)
            Retirement Savings Plans. Investors should call the Distributor at
            800-426-0107 for further information about these plans and should
            consult with their own tax advisers before establishing any re-
            tirement plan. Investors who maintain their accounts with partici-
            pating brokers should consult their broker about similar types of
            accounts that may be offered through the broker. The minimum ini-
            tial investment for all tax qualified plans (except for employer-
            sponsored plans, SIMPLE IRAs, SEPs and SAR/SEPs) is $1,000 per
            Fund and the minimum subsequent investment is $100 and the minimum
            initial investment for employer-sponsored plans, SIMPLE IRAs, SEPs
            and SAR/SEPs and the minimum subsequent investment per Fund for
            all such plans is $50.
 
38
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
 
PIMCO FUNDS The PIMCO Funds Auto-Invest plan provides for periodic investments
AUTO-INVEST into the shareholder's account with the Trust by means of auto-
            matic transfers of a designated amount from the shareholder's bank
            account. The minimum investment for eligibility in the PIMCO Funds
            Auto-Invest plan is $1,000 per Fund. Subsequent investments may be
            made monthly or quarterly, and may be in any amount subject to a
            minimum of $50 per month for each Fund in which shares are pur-
            chased through the plan. Further information regarding the PIMCO
            Funds Auto-Invest plan is available from the Distributor or par-
            ticipating brokers. You may enroll by completing the appropriate
            section on the account application, or you may obtain an Auto-In-
            vest application by calling the Distributor or your broker.
 
 
PIMCO FUNDS The PIMCO Funds Auto-Exchange plan establishes regular, periodic
AUTO-       exchanges from one Fund to another Fund or a series of PIMCO
EXCHANGE    Funds: Multi-Manager Series which offers Class A, Class B or Class
            C shares. The plan provides for regular investments into a share-
            holder's account in a specific Fund by means of automatic ex-
            changes of a designated amount from another Fund account of the
            same class of shares and with identical account registration.
               Exchanges may be made monthly or quarterly, and may be in any
            amount subject to a minimum of $50 for each Fund whose shares are
            purchased through the plan. Further information regarding the
            PIMCO Funds Auto-Exchange plan is available from the Distributor
            at 800-426-0107 or participating brokers. You may enroll by com-
            pleting an application which may be obtained from the Distributor
            or by telephone request at 800-426-0107. For more information on
            exchanges, see "Exchange Privilege."
 
 
PIMCO FUNDS PIMCO Funds Fund Link ("Fund Link") connects your Fund account
FUND LINK   with a bank account. Fund Link may be used for subsequent pur-
            chases and for redemptions and other transactions described under
            "How to Redeem." Purchase transactions are effected by electronic
            funds transfers from the shareholder's account at a U.S. bank or
            other financial institution that is an Automated Clearing House
            ("ACH") member. Investors may use Fund Link to make subsequent
            purchases of shares in amounts from $50 to $10,000. To initiate
            such purchases, call 800-426-0107. All such calls will be record-
            ed. Fund Link is normally established within 45 days of receipt of
            a Fund Link application by Shareholder Services, Inc. (the "Trans-
            fer Agent"). The minimum investment by Fund Link is $50 per Fund.
            Shares will be purchased on the regular business day the Distribu-
            tor receives the funds through the ACH system, provided the funds
            are received before the close of regular trading on the Exchange.
            If the funds are received after the close of regular trading, the
            shares will be purchased on the next regular business day.
               Fund Link privileges must be requested on the account applica-
            tion. To establish Fund Link on an existing account, complete a
            Fund Link application, which is available from the Distributor or
            your broker, with signatures guaranteed from all shareholders of
            record for the account. See "Signature Guarantee" below. Such
            privileges apply to each shareholder of record for the account un-
            less and until the Distributor receives written instructions from
            a shareholder of record canceling such privileges. Changes of bank
            account information must be made by completing a new Fund Link ap-
            plication signed by all owners of record of the account, with all
            signatures guaranteed. The Distributor, the Transfer Agent and the
            Fund may rely on any telephone instructions believed to be genuine
            and will not be responsible to shareholders for any damage, loss
            or expenses arising out of such instructions. The Fund reserves
            the right to amend, suspend or discontinue Fund Link privileges at
            any time without prior notice. Fund Link does not apply to shares
            held in broker "street name" accounts.
 
 
SIGNATURE
GUARANTEE
            When a signature guarantee is called for, the shareholder should
            have "Signature Guaranteed" stamped under his signature and guar-
            anteed by any of the following entities: U.S. banks, foreign banks
            having a U.S. correspondent bank, credit unions, savings associa-
            tions, U.S. registered dealers and brokers, municipal securities
            dealers and brokers, government securities dealers and brokers,
            national securities exchanges, registered securities associations
            and clearing agencies (each an "Eligible Guarantor Institution").
            The Distributor reserves the right to reject any signature guaran-
            tee pursuant to its written signature guarantee standards or pro-
            cedures, which may be revised in the future to permit it to reject
            signature guarantees from Eligible Guarantor Institutions that do
            not, based on credit guidelines, satisfy such written
                                                     August 1, 1998 Prospectus
                                                                              39
<PAGE>
 
            standards or procedures. The Trust may change the signature guar-
            antee requirements from time to time upon notice to shareholders,
            which may be given by means of a new or supplemented Prospectus.
 
 
ACCOUNT     Changes in registration or account privileges may be made in writ-
REGISTRATIONing to the Transfer Agent. Signature guarantees may be required.
CHANGES     See "Signature Guarantee" above. All correspondence must include
            the account number and must be sent to:
 
                PIMCO Funds Distributors LLC
                P.O. Box 5866
                Denver, CO 80217-5866
 
 
SMALL       Because of the disproportionately high costs of servicing accounts
ACCOUNT FEE with low balances, a fee at an annual rate of $16, paid to Pacific
            Investment Management, the Funds' administrator, will automati-
            cally be deducted from direct accounts with balances falling below
            a minimum level. The valuation of accounts and the deduction are
            expected to take place during the last five days of each calendar
            quarter. The fee will be deducted in quarterly installments from
            accounts with balances below $2,500 except for Uniform Gift to Mi-
            nors, IRA, Roth IRA and Auto-Invest accounts, for which the limit
            is $1,000. The fee will not apply to employer-sponsored retirement
            accounts or 403(b)(7) custodial accounts. (A separate custodial
            fee may apply to IRAs, Roth IRAs and other retirement accounts.)
            No fee will be charged on any account of a shareholder if the ag-
            gregate value of all of the shareholder's accounts is at least
            $50,000. No small account fee will be charged to employee and em-
            ployee-related accounts of PIMCO Advisors and/or its affiliates.
 
 
MINIMUM     Due to the relatively high cost to the Funds of maintaining small
ACCOUNT     accounts, you are asked to maintain an account balance of at least
SIZE        the amount necessary to open the type of account involved. If your
            balance is below such minimum for three months or longer, the
            Fund's administrator shall have the right (except in the case of
            employer-sponsored retirement accounts) to close your account af-
            ter giving you 60 days in which to increase your balance. Your ac-
            count will not be liquidated if the reduction in size is due
            solely to market decline in the value of your Fund shares or if
            the aggregate value of all your accounts in PIMCO Funds exceeds
            $50,000.
 
            Alternative Purchase Arrangements
               
            The Trust offers investors three classes of shares in this Pro-
            spectus (Class A, Class B and Class C) which bear sales charges in
            different forms and amounts and which bear different levels of ex-
            penses. Through separate prospectuses, certain of the Funds offer
            up to three additional classes of shares, Class D, Institutional
            Class and Administrative Class shares. Class D shares are offered
            through financial intermediaries. Institutional Class and Adminis-
            trative Class shares are offered to pension and profit sharing
            plans, employee benefit plans, endowments, foundations, corpora-
            tions and other high net worth individuals. Class D, Institutional
            Class and Administrative Class shares are sold without sales
            charges and have different expenses than Class A, Class B and
            Class C shares. As a result of lower sales charges and/or operat-
            ing expenses, Class D, Administrative Class and Institutional
            Class shares are generally expected to achieve higher investment
            returns than Class A, Class B or Class C shares. To obtain more
            information about the other classes of shares, please call the
            Distributor at 800-927-4648 (for Institutional and Administrative
            Classes) or 888-87-PIMCO (for Class D).     
               The alternative purchase arrangements offered in this Prospec-
            tus are designed to enable a retail investor to choose the method
            of purchasing Fund shares that is most beneficial to the investor
            based on all factors to be considered, which include: the amount
            and intended length of the investment; the particular Fund; and
            whether the investor intends to exchange shares for shares of
            other Funds. Generally, when making an investment decision, in-
            vestors should consider the anticipated life of an intended in-
            vestment in the Funds, the accumulated distribution and servicing
            fees plus CDSCs
 
40
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            on Class B or Class C shares, the initial sales charge plus accu-
            mulated servicing fees on Class A shares (plus a CDSC in certain
            circumstances), the possibility that the anticipated higher return
            on Class A shares due to the lower ongoing charges will offset the
            initial sales charge paid on such shares, the automatic conversion
            of Class B shares to Class A shares and the difference in the
            CDSCs applicable to Class A, Class B and Class C shares.
 
            CLASS A The initial sales charge alternative (Class A) might be
            preferred by investors purchasing shares of sufficient aggregate
            value to qualify for reductions in the initial sales charge appli-
            cable to such shares. Similar reductions are not available on the
            contingent deferred sales charge alternative (Class B) or the as-
            set based sales charge alternative (Class C). Class A shares are
            subject to a servicing fee but are not subject to a distribution
            fee and, accordingly, such shares are expected to pay correspond-
            ingly higher dividends on a per share basis. However, because ini-
            tial sales charges are deducted at the time of purchase, not all
            of the purchase payment for Class A shares is invested initially.
            Class B and Class C shares might be preferable to investors who
            wish to have all purchase payments invested initially, although
            remaining subject to higher distribution and servicing fees and,
            for certain periods, being subject to a CDSC. An investor who
            qualifies for an elimination of the Class A initial sales charge
            should also consider whether he or she anticipates redeeming
            shares in a time period which will subject such shares to a CDSC
            as described below. See "Initial Sales Charge Alternative--Class A
            Shares--Class A Deferred Sales Charge" below.
 
            CLASS B Class B shares might be preferred by investors who intend
            to invest in the Funds for longer periods and who do not intend to
            purchase shares of sufficient aggregate value to qualify for sales
            charge reductions applicable to Class A shares. Both Class B and
            Class C shares can be purchased at net asset value without an ini-
            tial sales charge. However, unlike Class C shares, Class B shares
            convert into Class A shares after the shares have been held for
            seven years. After the conversion takes place, the shares will no
            longer be subject to a CDSC, and will be subject to the servicing
            fees charged for Class A shares which are lower than the distribu-
            tion and servicing fees charged on either Class B or Class C
            shares. See "Deferred Sales Charge Alternative--Class B Shares"
            below. Class B shares are not available for purchase by employer
            sponsored retirement plans.
 
            CLASS C Class C shares might be preferred by investors who intend
            to purchase shares which are not of sufficient aggregate value to
            qualify for Class A sales charges of 1% or less and who wish to
            have all purchase payments invested initially. Class C shares are
            preferable to Class B shares for investors who intend to maintain
            their investment for intermediate periods and therefore may also
            be preferable for investors who are unsure of the intended length
            of their investment. Unlike Class B shares, Class C shares are not
            subject to a CDSC after they have been held for one year and are
            subject to only a 1% CDSC during the first year. However, because
            Class C shares do not convert into Class A shares, Class B shares
            are preferable to Class C shares for investors who intend to main-
            tain their investment in the Funds for long periods. See "Asset
            Based Sales Charge Alternative--Class C Shares" below.
               In determining which class of shares to purchase, an investor
            should always consider whether any waiver or reduction of a sales
            charge or a CDSC is available. See generally "Initial Sales Charge
            Alternative--Class A Shares" and "Waiver of Contingent Deferred
            Sales Charges" below.
               The maximum single purchase of Class B shares of the Trust and
            series of PIMCO Funds: Multi-Manager Series accepted is $249,999.
            The maximum single purchase of Class C shares of the Trust and se-
            ries of PIMCO Funds: Multi-Manager Series accepted is $999,999.
            The Funds may refuse any order to purchase shares.
               For a description of the Distribution and Servicing Plans and
            distribution and servicing fees payable thereunder with respect to
            Class A, Class B and Class C shares, see "Distributor and Distri-
            bution and Servicing Plans" below.
 
            WAIVER OF CONTINGENT DEFERRED SALES CHARGES The CDSC applicable to
            Class A and Class C shares is currently waived for (i) any partial
            or complete redemption in connection with any of the following
            distributions from a retirement plan, including a 403(b)(7) custo-
            dial account or an IRA (with the exception of a Roth IRA), that
            qualify for exemption
                                                     August 1, 1998 Prospectus
                                                                              41
<PAGE>
 
               
            from the additional tax on early distributions under Section 72(t)
            of the Internal Revenue Code of 1986, as amended (the "Code"): (a)
            upon attaining age 59 1/2, (b) on account of death or disability,
            (c) as part of a series of substantially equal periodic payments,
            (d) in the case of an IRA (with the exception of a Roth IRA), at-
            tributable to qualified higher education expenses or to qualified
            first-time home-buyer expenses, or (e) in the case of a retirement
            plan other than an IRA, upon separation from service after attain-
            ing age 55; (ii) any partial or complete redemption in connection
            with a qualifying loan or hardship withdrawal from an employer
            sponsored retirement plan; (iii) any complete redemption in con-
            nection with a distribution from a qualified employer retirement
            plan in connection with termination of employment or termination
            of the employer's plan and the transfer to another employer's plan
            or to an IRA (with the exception of a Roth IRA); (iv) any partial
            or complete redemption following death or disability (as defined
            in the Code) of a shareholder (including one who owns the shares
            as joint tenant with his or her spouse) from an account in which
            the deceased or disabled is named, provided the redemption is re-
            quested within one year of the death or initial determination of
            disability; (v) any redemption resulting from a return of an ex-
            cess contribution to a qualified employer retirement plan or an
            IRA (with the exception of a Roth IRA); (vi) up to 10% per year of
            the value of an account which (a) has the value of at least
            $10,000 at the start of such year and (b) is subject to an Auto-
            matic Withdrawal Plan; (vii) redemptions by Trustees, officers and
            employees of the Trust, and by directors, officers and employees
            of the Distributor and the Adviser; (viii) redemptions effected
            pursuant to a Fund's right to involuntarily redeem a shareholder's
            account if the aggregate net asset value of shares held in such
            shareholder's account is less than a minimum account size speci-
            fied in such Fund's prospectus; (ix) involuntary redemptions
            caused by operation of law; (x) redemption of shares of any Fund
            that is combined with another Fund, investment company, or per-
            sonal holding company by virtue of a merger, acquisition or other
            similar reorganization transaction; (xi) redemptions by a share-
            holder who is a participant making periodic purchases of not less
            than $50 through certain employer sponsored savings plans that are
            clients of a broker-dealer with which the Distributor has an
            agreement with respect to such purchases; (xii) redemptions ef-
            fected by trustees or other fiduciaries who have purchased shares
            for employer sponsored plans, the trustee, administrator, fiducia-
            ry, broker, trust company or registered investment adviser for
            which has an agreement with the Distributor with respect to such
            purchases; or (xiii) redemptions in connection with IRA accounts
            established with Form 5305-SIMPLE under the Code for which the
            Trust is the designated financial institution.     
               The CDSC applicable to Class B shares is currently waived for
            any partial or complete redemption in each of the following cases:
            (a) in connection with a distribution without penalty under Sec-
            tion 72(t) of the Code from a 403(b)(7) plan or an IRA (with the
            exception of a Roth IRA) upon attaining age 59 1/2; (b) following
            death or disability (as defined in the Code) of a shareholder (in-
            cluding one who owns the shares as joint tenant with his or her
            spouse) from an account in which the deceased or disabled is
            named, provided the redemption is requested within one year of the
            death or initial determination of disability; and (c) up to 10%
            per year of the value of an account which (i) has a value of at
            least $100,000 at the start of such year and (ii) is subject to an
            Automatic Withdrawal Plan. See "How to Redeem--Automatic With-
            drawal Plan."
               The Distributor may require documentation prior to waiver of
            the CDSC for any class, including distribution letters, certifica-
            tion by plan administrators, applicable tax forms, death certifi-
            cates, physicians' certificates, etc.
 
 
42
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
INITIAL
SALES
CHARGE
ALTERNATIVE --
            Class A shares are sold at a public offering price equal to their
            net asset value per share plus a sales charge, as set forth below.
            As indicated below under "Class A Deferred Sales Charge," certain
            investors that purchase $1,000,000 ($250,000 in the case of the
CLASS A     Short-Term Fund) or more of any Fund's Class A shares (and thus
SHARES      pay no initial sales charge) may be subject to a 1% CDSC if they
            redeem such shares during the first 18 months after their pur-
            chase.
 
 
              TOTAL RETURN, HIGH YIELD, LONG-TERM U.S. GOVERNMENT, GLOBAL BOND
              II, FOREIGN BOND AND EMERGING MARKETS BOND FUNDS
 
<TABLE>
<CAPTION>
                                SALES CHARGE                    DISCOUNT OR
                                AS % OF NET  SALES CHARGE       COMMISSION TO
           AMOUNT OF            AMOUNT       AS % OF THE PUBLIC DEALERS AS % OF
           PURCHASE             INVESTED     OFFERING PRICE     PUBLIC OFFERING PRICE
              -----------------------------------------------------------------------
           <S>                  <C>          <C>                <C>
           $0 - $49,999         4.71%        4.50%              4.00%
              -----------------------------------------------------------------------
           $50,000 - $99,999    4.17%        4.00%              3.50%
              -----------------------------------------------------------------------
           $100,000 - $249,999  3.63%        3.50%              3.00%
              -----------------------------------------------------------------------
           $250,000 - $499,999  2.56%        2.50%              2.00%
              -----------------------------------------------------------------------
           $500,000 - $999,999  2.04%        2.00%              1.75%
              -----------------------------------------------------------------------
           $1,000,000+          0.00%(/1/)   0.00%(/1/)         0.50%(/2/)
</TABLE>
 
 
              LOW DURATION, REAL RETURN BOND, MUNICIPAL BOND AND STOCKSPLUS
              FUNDS
 
<TABLE>
<CAPTION>
                                SALES CHARGE                    DISCOUNT OR
                                AS % OF NET  SALES CHARGE       COMMISSION TO
           AMOUNT OF            AMOUNT       AS % OF THE PUBLIC DEALERS AS % OF
           PURCHASE             INVESTED     OFFERING PRICE     PUBLIC OFFERING PRICE
              -----------------------------------------------------------------------
           <S>                  <C>          <C>                <C>
           $0 - $49,999         3.09%        3.00%              2.50%
              -----------------------------------------------------------------------
           $50,000 - $99,999    2.56%        2.50%              2.00%
              -----------------------------------------------------------------------
           $100,000 - $249,999  2.04%        2.00%              1.75%
              -----------------------------------------------------------------------
           $250,000 - $499,999  1.52%        1.50%              1.25%
              -----------------------------------------------------------------------
           $500,000 - $999,999  1.27%        1.25%              1.00%
              -----------------------------------------------------------------------
           $1,000,000+          0.00%(/1/)   0.00%(/1/)         0.50%(/2/)
</TABLE>
 
 
 
              SHORT-TERM FUND
 
<TABLE>
<CAPTION>
                                SALES CHARGE                    DISCOUNT OR
                                AS % OF NET  SALES CHARGE       COMMISSION TO
           AMOUNT OF            AMOUNT       AS % OF THE PUBLIC DEALERS AS % OF
           PURCHASE             INVESTED     OFFERING PRICE     PUBLIC OFFERING PRICE
              -----------------------------------------------------------------------
           <S>                  <C>          <C>                <C>
           $0 - $49,999         2.04%        2.00%              1.75%
              -----------------------------------------------------------------------
           $50,000 - $99,999    1.78%        1.75%              1.50%
              -----------------------------------------------------------------------
           $100,000 - $249,999  1.52%        1.50%              1.25%
              -----------------------------------------------------------------------
           $250,000+            0.00%(/1/)   0.00%(/1/)         0.25%(/2/)
</TABLE>
 
            1. As shown, investors that purchase more than $1,000,000 of any
            Fund's Class A shares ($250,000 in the case of the Short-Term
            Fund) will not pay any initial sales charge on such purchase. How-
            ever, except with regard to purchases of Class A shares of the
            Money Market Fund, purchasers of $1,000,000 ($250,000 in the case
            of the Short-Term Fund) or more of Class A shares (other than
            those purchasers described below under "Sales at Net Asset Value"
            where no commission is paid) will be subject to a CDSC of 1% if
            such shares are redeemed during the first 18 months after such
            shares are purchased unless such purchaser is eligible for a
            waiver of the CDSC as described under "Waiver of Contingent De-
            ferred Sales Charges" above. See "Class A Deferred Sales Charge"
            below.
 
            2. The Distributor will pay a commission to dealers who sell
            amounts of $1,000,000 ($250,000 in the case of the Short-Term
            Fund) or more of Class A shares (or who sell Class A shares at net
            asset value to certain employer-sponsored plans as outlined in
            "Sales at Net Asset Value") of each of the Funds except for the
            Money Market Fund (for which no payment is made) and the Short-
            Term Fund, according to the following schedule: 0.50% of the first
            $2,000,000 and 0.25% of amounts over $2,000,000; and 0.25% of
            sales of Class A shares of the Short-Term Fund in excess of
            $250,000.
 
               No initial sales charge applies to purchases of Class A shares
            of the Money Market Fund. However, if a shareholder exchanges
            Class A shares of the Money Market Fund, for which no sales load
            was paid at the time of purchase, for Class A shares of any other
            Fund, the sales charge shown above for the other Fund applies at
            the time of the exchange.
                                                     August 1, 1998 Prospectus
                                                                              43
<PAGE>
 
               Each Fund receives the entire net asset value of its Class A
            shares purchased by investors. The Distributor receives the sales
            charge shown above less any applicable discount or commission
            "reallowed" to participating brokers in the amounts indicated in
            the table above. The Distributor may, however, elect to reallow
            the entire sales charge to participating brokers for all sales
            with respect to which orders are placed with the Distributor for
            any particular Fund during a particular period. During such peri-
            ods as may from time to time be designated by the Distributor, the
            Distributor will pay an additional amount of up to .50% of the
            purchase price on sales of Class A shares of all or selected Funds
            purchased to each participating broker which obtains purchase or-
            ders in amounts exceeding thresholds established from time to time
            by the Distributor. From time to time, the Distributor, its parent
            and/or its affiliates may make additional payments to one or more
            participating brokers based upon factors such as the level of
            sales or the length of time clients' assets have remained in the
            Trust.
               Shares issued pursuant to the automatic reinvestment of income
            dividends or capital gains distributions are issued at net asset
            value and are not subject to any sales charges.
               Under the circumstances described below, investors may be enti-
            tled to pay reduced sales charges for Class A shares.
 
            COMBINED PURCHASE PRIVILEGE Investors may qualify for a reduced
            sales charge by combining purchases of the Class A shares of one
            or more Funds or series of PIMCO Funds: Multi-Manager Series which
            offer Class A shares (together, "eligible PIMCO Funds") into a
            "single purchase," if the resulting purchase totals at least
            $50,000. The term single purchase refers to:
                (i) a single purchase by an individual, or concurrent
                    purchases, which in the aggregate are at least equal to
                    the prescribed amounts, by an individual, his or her
                    spouse and their children under the age of 21 years
                    purchasing Class A shares of the eligible PIMCO Funds for
                    his, her or their own account;
                (ii) a single purchase by a trustee or other fiduciary
                     purchasing shares for a single trust, estate or fiduciary
                     account although more than one beneficiary is involved;
                     or
                (iii) a single purchase for the employee benefit plans of a
                      single employer.
            For further information, call the Distributor at 800-426-0107 or
            your broker.
 
            CUMULATIVE QUANTITY DISCOUNT (RIGHT OF ACCUMULATION) A purchase of
            additional Class A shares of any eligible PIMCO Fund may qualify
            for a Cumulative Quantity Discount at the rate applicable to the
            discount bracket obtained by adding:
                (i) the investor's current purchase;
                (ii) the value (at the close of business on the day of the
                     current purchase) of all Class A shares of any eligible
                     PIMCO Fund (other than the Money Market Fund) held by the
                     investor computed at the maximum offering price; and
                (iii) the value of all shares described in paragraph (ii)
                      owned by another shareholder eligible to be combined
                      with the investor's purchase into a "single purchase" as
                      defined above under "Combined Purchase Privilege."
              For example, if you owned Class A shares of the Total Return
            Fund worth $25,000 at the current maximum offering price and
            wished to purchase Class A shares of the Global Bond Fund II worth
            an additional $30,000, the sales charge for the $30,000 purchase
            would be at the 4.00% rate applicable to a single $55,000 purchase
            of shares of the Global Bond Fund II, rather than the 4.50% rate.
 
            LETTER OF INTENT An investor may also obtain a reduced sales
            charge by means of a written Letter of Intent, which expresses an
            intention to invest not less than $50,000 within a period of 13
            months in Class A shares of any eligible PIMCO Fund(s) (other than
            the Money Market Fund). Each purchase of shares under a Letter of
            Intent will be made at the public offering price or prices appli-
            cable at the time of such purchase to a single transaction of the
            dollar amount indicated in the Letter. At the investor's option, a
            Letter of Intent may include purchases of Class A shares of any
            eligible PIMCO Fund (other than the Money Market Fund) made not
            more than 90 days prior to the date the Letter of
 
44
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Intent is signed; however, the 13-month period during which the
            Letter is in effect will begin on the date of the earliest pur-
            chase to be included and the sales charge on any purchases prior
            to the Letter will not be adjusted.
               Investors qualifying for the Combined Purchase Privilege de-
            scribed above may purchase shares of the eligible PIMCO Funds un-
            der a single Letter of Intent. For example, if at the time you
            sign a Letter of Intent to invest at least $100,000 in Class A
            shares of any Fund (other than the Money Market Fund), you and
            your spouse each purchase Class A shares of the Global Bond Fund
            II worth $30,000 (for a total of $60,000), it will only be neces-
            sary to invest a total of $40,000 during the following 13 months
            in Class A shares of any of the Funds (other than the Money Market
            Fund) to qualify for the 3.50% sales charge on the total amount
            being invested (the sales charge applicable to an investment of
            $100,000 in any of the Funds other than the Money Market, Short-
            Term, Low Duration, Real Return Bond, Municipal Bond and
            StocksPLUS Funds).
               A Letter of Intent is not a binding obligation to purchase the
            full amount indicated. The minimum initial investment under a Let-
            ter of Intent is 5% of such amount. Shares purchased with the
            first 5% of such amount will be held in escrow (while remaining
            registered in your name) to secure payment of the higher sales
            charge applicable to the shares actually purchased in the event
            the full intended amount is not purchased. If the full amount in-
            dicated is not purchased, a sufficient amount of such escrowed
            shares will be involuntarily redeemed to pay the additional sales
            charge applicable to the amount actually purchased, if necessary.
            Dividends on escrowed shares, whether paid in cash or reinvested
            in additional eligible PIMCO Fund shares, are not subject to es-
            crow. When the full amount indicated has been purchased, the es-
            crow will be released.
               If you wish to enter into a Letter of Intent in conjunction
            with your initial investment in Class A shares of a Fund, you
            should complete the appropriate portion of the account
            application. If you are a current Class A shareholder desiring to
            do so you can obtain a form of Letter of Intent by contacting the
            Distributor at 800-426-0107 or any broker participating in this
            program.
 
            REINSTATEMENT PRIVILEGE A Class A shareholder who has caused any
            or all of his shares (other than Money Market Fund shares that
            were not acquired by exchanging Class A shares of another Fund) to
            be redeemed may reinvest all or any portion of the redemption pro-
            ceeds in Class A shares of any eligible PIMCO Fund at net asset
            value without any sales charge, provided that such reinvestment is
            made within 120 calendar days after the redemption or repurchase
            date. Shares are sold to a reinvesting shareholder at the net as-
            set value next determined. See "How Net Asset Value is Deter-
            mined." A reinstatement pursuant to this privilege will not cancel
            the redemption transaction and, consequently, any gain or loss so
            realized may be recognized for federal tax purposes except that no
            loss may be recognized to the extent that the proceeds are rein-
            vested in shares of the same Fund within 30 days. The reinstate-
            ment privilege may be utilized by a shareholder only once, irre-
            spective of the number of shares redeemed, except that the privi-
            lege may be utilized without limit in connection with transactions
            whose sole purpose is to transfer a shareholder's interest in a
            Fund to his Individual Retirement Account or other qualified re-
            tirement plan account. An investor may exercise the reinstatement
            privilege by written request sent to the Distributor or to the in-
            vestor's broker.
               
            SALES AT NET ASSET VALUE Each Fund may sell its Class A shares at
            net asset value without a sales charge to (a) current or retired
            officers, trustees, directors or employees of the Trust, the Ad-
            viser or the Distributor, a parent, brother or sister of any such
            officer, trustee, director or employee or a spouse or child of any
            of the foregoing persons, or any trust, profit sharing or pension
            plan for the benefit of any such person and to any other person if
            the Distributor anticipates that there will be minimal sales ex-
            penses associated with the sale, (b) current or retired trustees
            of PIMCO Funds: Multi-Manager Series, a registered investment com-
            pany for which PIMCO Advisors L.P., an affiliate of the Adviser,
            acts as investment adviser, (c) current registered representatives
            and other full-time employees of participating brokers or such
            persons' spouses or for trust or custodial accounts for their mi-
            nor children, (d) trustees or other fiduciaries purchasing shares
            for certain employer sponsored plans that have at least 100 eligi-
            ble participants or at least $1 million in total plan assets,
            (e) trustees or other fiduciaries purchasing shares for certain
            plans sponsored by employers, profes     -
                                                     August 1, 1998 Prospectus
                                                                              45
<PAGE>
 
               
            sional organizations or associations, or charitable organizations,
            the trustee, administrator, fiduciary, broker, trust company or
            registered investment adviser for which has an agreement with the
            Distributor with respect to such purchases, and to participants in
            such plans and their spouses purchasing for their accounts(s) or
            IRAs (with the exception of Roth IRAs), (f) participants investing
            through accounts known as "wrap accounts" established with brokers
            or dealers approved by the Distributor where such brokers or deal-
            ers are paid a single, inclusive fee for brokerage and investment
            management services, (g) client accounts of broker-dealers or reg-
            istered investment advisers affiliated with such broker-dealers
            with which the Distributor has an agreement for the use of PIMCO
            Funds in particular investment products or programs, and (h) ac-
            counts for which a trust company affiliated with the Trust or the
            Adviser serves as trustee or custodian. As described above, the
            Distributor will not pay any initial commission to dealers upon
            the sale of Class A shares to the purchasers described in this
            paragraph except for sales to purchasers described under (d) or
            (e) in this paragraph.     
 
            NOTIFICATION OF DISTRIBUTOR An investor or participating broker
            must notify the Distributor whenever a quantity discount or re-
            duced sales charge is applicable to a purchase and must provide
            the Distributor with sufficient information at the time of pur-
            chase to verify that each purchase qualifies for the privilege or
            discount. Upon such notification, the investor will receive the
            lowest applicable sales charge. The quantity discounts described
            above may be modified or terminated at any time.
 
            CLASS A DEFERRED SALES CHARGE For all Funds except the Money Mar-
            ket Fund, investors who purchase $1,000,000 ($250,000 in the case
            of the Short-Term Fund) or more of Class A shares (and, thus, pur-
            chase such shares without any initial sales charge) may be subject
            to a 1% CDSC (the "Class A CDSC") if such shares are redeemed
            within 18 months of their purchase. The Class A CDSC does not ap-
            ply to investors purchasing $1,000,000 or more of any Fund's Class
            A shares ($250,000 in the case of the Short-Term Fund) if such in-
            vestors are otherwise eligible to purchase Class A shares without
            any sales charge because they are described under "Sales at Net
            Asset Value" above.
               For purchases subject to the Class A CDSC, a 1% CDSC will apply
            for any redemption of such Class A shares that occurs within 18
            months of their purchase. No CDSC will be imposed if the shares
            redeemed have been acquired through the reinvestment of dividends
            or capital gains distributions or if the amount redeemed is de-
            rived from increases in the value of the account above the amount
            of purchase payments subject to the CDSC. In determining whether a
            CDSC is payable, it is assumed that Class A shares acquired
            through the reinvestment of dividends and distributions are re-
            deemed first, and thereafter that Class A shares that have been
            held by an investor for the longest period of time are redeemed
            first.
               The Class A CDSC does not apply to Class A shares of the Money
            Market Fund but, if Money Market Fund Class A shares are purchased
            in a transaction that, for any other Fund, would be subject to the
            CDSC (i.e., a purchase of $1,000,000 ($250,000 in the case of the
            Short-Term Fund) or more) and are subsequently exchanged for Class
            A shares of any other Fund, a Class A CDSC will apply to the
            shares of the Fund acquired by exchange for a period of 18 months
            from the date of the exchange.
               The Class A CDSC is currently waived in connection with certain
            redemptions as described above under "Alternative Purchase Ar-
            rangements--Waiver of Contingent Deferred Sales Charges." For more
            information about the Class A CDSC, call the Distributor at 800-
            426-0107.
 
            PARTICIPATING BROKERS Investment dealers and other financial in-
            termediaries provide varying arrangements for their clients to
            purchase and redeem Fund shares. Some may establish higher minimum
            investment requirements than set forth above. Firms may arrange
            with their clients for other investment or administrative services
            and may independently establish and charge transaction fees and/or
            other additional amounts to their clients for such services, which
            charges would reduce clients' return. Firms also may hold Fund
            shares in nominee or street name as agent for and on behalf of
            their customers. In such instances, the Trust's transfer agent
            will have no information with respect to or control
 
46
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            over accounts of specific shareholders. Such shareholders may ob-
            tain access to their accounts and information about their accounts
            only from their broker. In addition, certain privileges with re-
            spect to the purchase and redemption of shares or the reinvestment
            of dividends may not be available through such firms. Some firms
            may participate in a program allowing them access to their cli-
            ents' accounts for servicing including, without limitation, trans-
            fers of registration and dividend payee changes; and may perform
            functions such as generation of confirmation statements and dis-
            bursement of cash dividends. This Prospectus should be read in
            connection with such firms' material regarding their fees and
            services.
 
 
DEFERRED
SALES
CHARGE
ALTERNATIVE --
CLASS B
SHARES
            Class B shares are sold at their current net asset value without
            any initial sales charge. The full amount of an investor's pur-
            chase payment will be invested in shares of the Fund(s) selected.
            A CDSC will be imposed on Class B shares of all Funds if an in-
            vestor redeems an amount which causes the current value of the in-
            vestor's account for a Fund to fall below the total dollar amount
            of purchase payments subject to the CDSC, except that no CDSC is
            imposed if the shares redeemed have been acquired through the re-
            investment of dividends or capital gains distributions or if the
            amount redeemed is derived from increases in the value of the ac-
            count above the amount of purchase payments subject to the CDSC.
               Class B shares of the Short-Term Fund and the Money Market Fund
            are not offered for initial purchase but may be obtained through
            exchanges of Class B shares of other Funds. See "Exchange Privi-
            lege" below. Class B shares are not available for purchase by em-
            ployer sponsored retirement plans.
               Whether a CDSC is imposed and the amount of the CDSC will de-
            pend on the number of years since the investor made a purchase
            payment from which an amount is being redeemed. Purchases are sub-
            ject to the CDSC according to the following schedule:
 
 
<TABLE>
<CAPTION>
           YEAR SINCE PURCHASE   PERCENTAGE CONTINGENT
           PAYMENT WAS MADE      DEFERRED SALES CHARGE
              ----------------------------------------
           <S>                   <C>
           First                   5%
              ----------------------------------------
           Second                  4
              ----------------------------------------
           Third                   3
              ----------------------------------------
           Fourth                  3
              ----------------------------------------
           Fifth                   2
              ----------------------------------------
           Sixth                   1
              ----------------------------------------
           Seventh                 0*
</TABLE>
 
            *After the seventh year,
            Class B shares convert into
            Class A shares as described
            below.
 
               In determining whether a CDSC is payable, it is assumed that
            the purchase payment from which a redemption is made is the earli-
            est purchase payment from which a redemption or exchange has not
            already been fully effected.
               The following example will illustrate the operation of the
            Class B CDSC:
               Assume that an individual opens an account and makes a purchase
            payment of $10,000 for Class B shares of a Fund (except the Money
            Market and Short-Term Funds) and that six months later the value
            of the investor's account for that Fund has grown through invest-
            ment performance and reinvestment of distributions to $11,000. The
            investor then may redeem up to $1,000 from that Fund ($11,000 mi-
            nus $10,000) without incurring a CDSC. If the investor should re-
            deem $3,000, a CDSC would be imposed on $2,000 of the redemption
            (the amount by which the investor's account for the Fund was re-
            duced below the amount of the purchase payment). At the rate of
            5%, the Class B CDSC would be $100.
               In determining whether an amount is available for redemption
            without incurring a CDSC, the purchase payments made for all Class
            B shares in the shareholder's account with the particular Fund are
            aggregated, and the current value of all such shares is aggregat-
            ed. Any CDSC imposed on a redemption of Class B shares is paid to
            the Distributor.
                                                     August 1, 1998 Prospectus
                                                                              47
<PAGE>
 
               Class B shares are subject to higher distribution fees than
            Class A shares for a fixed period after their purchase, after
            which they automatically convert to Class A shares and are no
            longer subject to such higher distribution fees. Class B shares of
            each Fund automatically convert into Class A shares after they
            have been held for seven years.
               For sales of Class B shares made and services rendered to Class
            B shareholders, the Distributor intends to make payments to par-
            ticipating brokers, at the time a shareholder purchases Class B
            shares, of 4% of the purchase amount for each of the Funds. During
            such periods as may from time to time be designated by the Dis-
            tributor, the Distributor will pay selected participating brokers
            an additional amount of up to .50% of the purchase price on sales
            of Class B shares of all or selected Funds purchased to each par-
            ticipating broker which obtains purchase orders in amounts exceed-
            ing thresholds established from time to time by the Distributor.
               The Class B CDSC is currently waived in connection with certain
            redemptions as described above under "Alternative Purchase Ar-
            rangements--Waiver of Contingent Deferred Sales Charges." For more
            information about the Class B CDSC, call the Distributor at 800-
            426-0107.
 
 
ASSET BASED
SALES
CHARGE
ALTERNATIVE --
CLASS C
SHARES
            Class C shares are sold at their current net asset value without
            any initial sales charge. A CDSC is imposed on Class C shares of
            all Funds if an investor redeems an amount which causes the cur-
            rent value of the investor's account for a Fund to fall below the
            total dollar amount of purchase payments subject to the CDSC, ex-
            cept that no CDSC is imposed if the shares redeemed have been ac-
            quired through the reinvestment of dividends or capital gains dis-
            tributions or if the amount redeemed is derived from increases in
            the value of the account above the amount of purchase payments
            subject to the CDSC. All of an investor's purchase payments are
            invested in shares of the Fund(s) selected.
               Whether a CDSC is imposed and the amount of the CDSC will de-
            pend on the number of years since the investor made a purchase
            payment from which an amount is being redeemed. Purchases are sub-
            ject to the CDSC according to the following schedule:
 
 
<TABLE>
<CAPTION>
           YEAR SINCE PURCHASE   PERCENTAGE CONTINGENT
           PAYMENT WAS MADE      DEFERRED SALES CHARGE
              ----------------------------------------
           <S>                   <C>
           First                   1
              ----------------------------------------
           Thereafter              0
</TABLE>
 
 
               In determining whether a CDSC is payable, it is assumed that
            the purchase payment from which the redemption is made is the ear-
            liest purchase payment (from which a redemption or exchange has
            not already been effected).
               The following example will illustrate the operation of the
            Class C CDSC:
               Assume that an individual opens an account and makes a purchase
            payment of $10,000 for Class C shares of a Fund and that six
            months later the value of the investor's account for that Fund has
            grown through investment performance and reinvestment of distribu-
            tions to $11,000. The investor then may redeem up to $1,000 from
            that Fund ($11,000 minus $10,000) without incurring a CDSC. If the
            investor should redeem $3,000, a CDSC would be imposed on $2,000
            of the redemption (the amount by which the investor's account for
            the Fund was reduced below the amount of the purchase payment). At
            the rate of 1%, the Class C CDSC would be $20.
               In determining whether an amount is available for redemption
            without incurring a CDSC, the purchase payments made for all Class
            C shares in the shareholder's account with the particular Fund are
            aggregated, and the current value of all such shares is aggregat-
            ed. Any CDSC imposed on a redemption of Class C shares is paid to
            the Distributor. Unlike Class B shares, Class C shares do not au-
            tomatically convert to any other class of shares of the Funds.
               Except as described below, for sales of Class C shares made and
            services rendered to Class C shareholders, the Distributor expects
            to make payments to participating brokers, at the time the share-
            holder purchases Class C shares, of 1.00% (representing .75% dis-
            tribution fees and .25% servicing fees) of the purchase amount for
            all Funds except the Money Market, Short-Term, Low Duration, Real
            Return Bond, Municipal Bond and StocksPLUS Funds. For the Low
 
48
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Duration, Real Return Bond, Municipal Bond and StocksPLUS Funds,
            the Distributor expects to make payments of .75% (representing
            .50% distribution fees and .25% service fees); for the Short-Term
            Fund, the Distributor expects to make payments of .55% (represent-
            ing .30% distribution fees and .25% service fees); and for the
            Money Market Fund, the Distributor expects to make no payment. For
            sales of Class C shares made to participants making periodic pur-
            chases of not less than $50 through certain employer sponsored
            savings plans which are clients of a broker-dealer with which the
            Distributor has an agreement with respect to such purchases, no
            payments are made at the time of purchase. During such periods as
            may from time to time be designated by the Distributor, the Dis-
            tributor will pay an additional amount of up to .50% of the pur-
            chase price on sales of Class C shares of all or selected Funds
            purchased to each participating broker which obtains purchase or-
            ders in amounts exceeding thresholds established from time to time
            by the Distributor.
               The Class C CDSC is currently waived in connection with certain
            redemptions as described above under "Alternative Purchase Ar-
            rangements--Waiver of Contingent Deferred Sales Charges." For more
            information about the Class C CDSC, contact the Distributor at
            800-426-0107.
 
            Exchange Privilege
               
            A shareholder may exchange Class A, Class B and Class C shares of
            any Fund for the same Class of shares of any other Fund in an ac-
            count with identical registration on the basis of their respective
            net asset values (except that a sales charge will apply on ex-
            changes of Class A shares of the Money Market Fund on which no
            sales charge was paid at the time of purchase). Class A, Class B
            and Class C shares of each Fund may also be exchanged for shares
            of the same class of a series which offers such classes (except
            for the Opportunity Fund if a restriction applies) of PIMCO Funds:
            Multi-Manager Series, an affiliated mutual fund family composed
            primarily of equity portfolios managed by the subsidiary partner-
            ships of PIMCO Advisors L.P. Class A shares of the Money Market
            Fund may be exchanged for Class A shares of any other Fund, but
            the usual sales charges applicable to investments in such other
            Fund apply on shares for which no sales load was paid at the time
            of purchase. There are currently no exchange fees or charges. Ex-
            cept with respect to tax- qualified programs and exchanges ef-
            fected through the PIMCO Funds Auto-Exchange plan, exchanges are
            subject to the $2,500 minimum initial purchase requirement for
            each Fund. An exchange will constitute a taxable sale for federal
            income tax purposes.     
               
               Investors who maintain their account with the Distributor may
            exchange shares by a written exchange request sent to PIMCO Funds
            Distributors LLC, P.O. Box 5866, Denver, CO 80217-5866 or, unless
            the investor has specifically declined telephone exchange privi-
            leges on the account application or elected in writing not to uti-
            lize telephone exchanges, by a telephone request to the Transfer
            Agent at 800-426-0107. The Trust will employ reasonable procedures
            to confirm that instructions communicated by telephone are genu-
            ine, and may be liable for any losses due to unauthorized or
            fraudulent instructions if it fails to employ such procedures. The
            Trust will require a form of personal identification prior to act-
            ing on a caller's telephone instructions, will provide written
            confirmations of such transactions and will record telephone in-
            structions. Exchange forms are available from the Distributor at
            800-426-0107 and may be used if there will be no change in the
            registered name or address of the shareholder. Changes in regis-
            tration information or account privileges may be made in writing
            to the Transfer Agent, Shareholder Services, Inc., P.O. Box 5866,
            Denver, Colorado 80217-5866, or by use of forms which are avail-
            able from the Distributor. A signature guarantee is required. See
            "How to Buy Shares--Signature Guarantee." Telephone exchanges may
            be made between 9:00 a.m., Eastern time and the close of regular
            trading (normally 4:00 p.m., Eastern time) on the Exchange on any
            day the Exchange is open (generally weekdays other than normal
            holidays). The Trust reserves the right to refuse exchange pur-
            chases if, in the judgment of the Adviser, the purchase would ad-
            versely affect the Fund and its shareholders. In particular, a
            pattern of exchanges characteristic of "market-timing" strategies
            may be deemed by the Adviser to be detrimental to the Trust or a
            particular Fund. Currently, the Trust limits the number of "round
            trip" exchanges an investor may make. An investor makes a "round
            trip" exchange when the investor purchases shares of a particular
            Fund, subsequently exchanges these shares for shares of a differ-
            ent Fund and then exchanges back into the originally purchased
            Fund. The Trust has the     
                                                     August 1, 1998 Prospectus
                                                                              49
<PAGE>
 
               
            right to refuse any exchange for any investor who completes (by
            making the exchange back into the shares of the originally pur-
            chased Fund) more than six round trip exchanges in any twelve-
            month period. Although the Trust has no current intention of ter-
            minating or modifying the exchange privilege other than as set
            forth in the preceding sentence, it reserves the right to do so at
            any time. Except as otherwise permitted by Securities and Exchange
            Commission regulations, the Trust will give 60 days' advance no-
            tice to shareholders of any termination or material modification
            of the exchange privilege. For further information about exchange
            privileges, contact your participating broker or call the Transfer
            Agent at 800-426-0107.     
               With respect to Class B and Class C shares, or Class A shares
            subject to a CDSC, if less than all of an investment is exchanged
            out of a Fund, any portion of the investment attributable to capi-
            tal appreciation and/or reinvested dividends or capital gains dis-
            tributions will be exchanged first, and thereafter any portions
            exchanged will be from the earliest investment made in the Fund
            from which the exchange was made. Shareholders should take into
            account the effect of any exchange on the applicability of any
            CDSC that may be imposed upon any subsequent redemption. Although
            the Class A CDSC does not apply to Class A shares of the Money
            Market Fund, Class A shares purchased in a transaction that would
            otherwise be subject to the Class A CDSC (i.e., most purchases of
            $1,000,000 or more) are subsequently exchanged for Class A shares
            of any other Fund, a Class A CDSC will apply to the shares of the
            Fund acquired by exchange for a period of 18 months from the date
            of the exchange. See "Initial Sales Charge Alternative--Class A
            Shares--Class A Deferred Sales Charge" above.
               Investors may also select the PIMCO Funds Auto-Exchange plan
            which establishes automatic periodic exchanges. For further infor-
            mation on automatic exchanges see "How to Buy Shares--PIMCO Funds
            Auto-Exchange" above.
 
            How to Redeem
 
            Class A, Class B or Class C shares may be redeemed through a par-
            ticipating broker, by telephone, by submitting a written redemp-
            tion request directly to the Transfer Agent (for non-broker ac-
            counts), or through an Automatic Withdrawal Plan or PIMCO Funds
            Fund Link.
               A CDSC may apply to a redemption of Class A, Class B or Class C
            shares. See "Alternative Purchase Arrangements" above. Shares are
            redeemed at their net asset value next determined after a proper
            redemption request has been received, less any applicable CDSC.
            There is no charge by the Distributor (other than an applicable
            CDSC) with respect to a redemption; however, a participating bro-
            ker who processes a redemption for an investor may charge custom-
            ary commissions for its services. Dealers and other financial
            services firms are obligated to transmit orders promptly. Requests
            for redemption received by dealers or other firms prior to the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            Exchange on a regular business day and received by the Distributor
            prior to the close of the Distributor's business day will be con-
            firmed at the net asset value effective as of the closing of the
            Exchange on that day, less any applicable CDSC.
 
 
DIRECT      A shareholder's original account application permits the share-
REDEMPTION  holder to redeem by written request and by telephone (unless the
            shareholder specifically elects not to utilize telephone redemp-
            tions) and to elect one or more of the additional redemption pro-
            cedures described below. A shareholder may change the instructions
            indicated on his original account application, or may request ad-
            ditional redemption options, only by transmitting a written direc-
            tion to the Transfer Agent. Requests to institute or change any of
            the additional redemption procedures will require a signature
            guarantee.
               Redemption proceeds will normally be mailed to the redeeming
            shareholder within seven days or, in the case of wire transfer or
            Fund Link redemptions, sent to the designated bank account within
            one business day. Fund Link redemptions may be received by the
            bank on the second or third business day. In cases where shares
            have recently been purchased by personal check, redemption pro-
            ceeds may be withheld until the check has been collected, which
            may take up to 15 days. To avoid such withholding, investors
            should purchase shares by certified or bank check or by wire
            transfer.
 
50
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
 
WRITTEN     To redeem shares in writing (whether or not represented by certif-
REQUESTS    icates), a shareholder must send the following items to the Trans-
            fer Agent, Shareholder Services, Inc., P.O. Box 5866, Denver, Col-
            orado 80217-5866:
                (1) a written request for redemption signed by all registered
                    owners exactly as the account is registered on the
                    Transfer Agent's records, including fiduciary titles, if
                    any, and specifying the account number and the dollar
                    amount or number of shares to be redeemed;
                (2) for certain redemptions described below, a guarantee of
                    all signatures on the written request or on the share
                    certificate or accompanying stock power, if required, as
                    described under "How to Buy Shares--Signature Guarantee";
                (3) any share certificates issued for any of the shares to be
                    redeemed (see "Certificated Shares" below); and
                (4) any additional documents which may be required by the
                    Transfer Agent for redemption by corporations,
                    partnerships or other organizations, executors,
                    administrators, trustees, custodians or guardians, or if
                    the redemption is requested by anyone other than the
                    shareholder(s) of record.
               Transfers of shares are subject to the same requirements. A
            signature guarantee is not required for redemptions of $50,000 or
            less, requested by and payable to all shareholders of record for
            the account, to be sent to the address of record for that account.
            To avoid delay in redemption or transfer, shareholders having any
            questions about these requirements should contact the Transfer
            Agent in writing or by calling 1-800-426-0107 before submitting a
            request. Redemption or transfer requests will not be honored until
            all required documents in the proper form have been received by
            the Transfer Agent. This redemption option does not apply to
            shares held in broker "street name" accounts.
               If the proceeds of the redemption (i) exceed $50,000, (ii) are
            to be paid to a person other than the record owner, (iii) are to
            be sent to an address other than the address of the account on the
            Transfer Agent's records, or (iv) are to be paid to a corporation,
            partnership, trust or fiduciary, the signature(s) on the redemp-
            tion request and on the certificates, if any, or stock power must
            be guaranteed as described above, except that the Distributor may
            waive the signature guarantee requirement for redemptions up to
            $2,500 by a trustee of a qualified retirement plan, the adminis-
            trator for which has an agreement with the Distributor.
 
 
TELEPHONE   The Trust accepts telephone requests for redemption of shares for
REDEMPTIONS amounts up to $50,000 within any 7 calendar day period, except for
            investors who have specifically declined telephone redemption
            privileges on the account application or elected in writing not to
            utilize telephone redemptions. The proceeds of a telephone redemp-
            tion will be sent to the record shareholder at his record address.
            Changes in account information must be made in a written authori-
            zation with a signature guarantee. See "How to Buy Shares--Signa-
            ture Guarantee". Telephone redemptions will not be accepted during
            the 30-day period following any change in an account's record ad-
            dress. This redemption option does not apply to shares held in
            broker "street name" accounts.
               By completing an account application, an investor agrees that
            the Trust, the Distributor and the Transfer Agent shall not be li-
            able for any loss incurred by the investor by reason of the Trust
            accepting unauthorized telephone redemption requests for his ac-
            count if the Trust reasonably believes the instructions to be gen-
            uine. Thus, shareholders risk possible losses in the event of a
            telephone redemption not authorized by them. The Trust may accept
            telephone redemption instructions from any person identifying him-
            self as the owner of an account or the owner's broker where the
            owner has not declined in writing to utilize this service. The
            Trust will employ reasonable procedures to confirm that instruc-
            tions communicated by telephone are genuine, and may be liable for
            any losses due to unauthorized or fraudulent instructions if it
            fails to employ such procedures. The Trust will require a form of
            personal identification prior to acting on a caller's telephone
            instructions, will provide written confirmations of such transac-
            tions and will record telephone instructions.
               A shareholder making a telephone redemption should call the
            Transfer Agent at 800-426-0107 and state (i) the name of the
            shareholder as it appears on the Transfer Agent's records, (ii)
            his account number with the Trust, (iii) the amount to be with-
            drawn and (iv) the name of the person requesting the redemption.
            Usually the proceeds are sent to the investor on the next Trust
            business day after the redemption is effected, provided the re-
            demption request is received prior to the close of regular trading
            (normally 4:00 p.m., Eastern time) on the Exchange that day. If
            the redemption
 
                                                                             51
                                                     August 1, 1998 Prospectus
<PAGE>
 
            request is received after the close of the Exchange, the redemp-
            tion is effected on the following Trust business day at that day's
            net asset value and the proceeds are usually sent to the investor
            on the second following Trust business day. The Trust reserves the
            right to terminate or modify the telephone redemption service at
            any time. During times of severe disruptions in the securities
            markets, the volume of calls may make it difficult to redeem by
            telephone, in which case a shareholder may wish to send a written
            request for redemption as described under "Written Requests"
            above. Telephone communications may be recorded by the Distributor
            or the Transfer Agent.
 
 
FUND LINK   If a shareholder has established Fund Link, the shareholder may
REDEMPTIONS redeem shares by telephone and have the redemption proceeds sent
            to a designated account at a financial institution. Fund Link is
            normally established within 45 days of receipt of a Fund Link ap-
            plication by the Transfer Agent. To use Fund Link for redemptions,
            call the Transfer Agent at 800-426-0107. Subject to the limita-
            tions set forth above under "Telephone Redemptions," the Distribu-
            tor, the Trust and the Transfer Agent may rely on instructions by
            any registered owner believed to be genuine and will not be re-
            sponsible to any shareholder for any loss, damage or expense aris-
            ing out of such instructions. Requests received by the Transfer
            Agent prior to the close of regular trading (normally 4:00 p.m.,
            Eastern time) on the Exchange on a business day will be processed
            at the net asset value on that day and the proceeds (less any
            CDSC) will normally be sent to the designated bank account on the
            following business day and received by the bank on the second or
            third business day. If the redemption request is received after
            the close of regular trading on the Exchange, the redemption is
            effected on the following business day. Shares purchased by check
            may not be redeemed through Fund Link until such shares have been
            owned (i.e., paid for) for at least 15 days. Fund Link may not be
            used to redeem shares held in certificated form. Changes in bank
            account information must be made by completing a new Fund Link ap-
            plication, signed by all owners of record of the account, with all
            signatures guaranteed. See "How to Buy Shares--Signature Guaran-
            tee." See "How to Buy Shares-- PIMCO Funds Fund Link" for informa-
            tion on establishing the Fund Link privilege. The Trust may termi-
            nate the Fund Link program at any time without notice to share-
            holders. This redemption option does not apply to shares held in
            broker "street name" accounts.
 
 
PIMCO FUNDS PIMCO Funds Automated Telephone System ("ATS") is an automated
AUTOMATED   telephone system that enables shareholders to perform a number of
TELEPHONE   account transactions automatically using a touch-tone telephone.
SYSTEM      ATS may be used on already-established Fund accounts after you ob-
            tain a Personal Identification Number (PIN) by calling the special
            ATS number: 1-800-223-2413.
            PURCHASING SHARES. You may purchase shares in amounts up to
            $100,000 by telephone by calling 1-800-223-2413. You must have es-
            tablished ATS privileges to link your bank account with the Fund
            to pay for these purchases.
            EXCHANGING SHARES. With the PIMCO Funds Exchange Privilege, you
            can exchange shares automatically by telephone from your Fund Link
            Account to another PIMCO Funds account you have already estab-
            lished by calling 1-800-223-2413. Please refer to "Exchange Privi-
            lege" below for details.
            REDEMPTIONS. You may redeem shares by telephone automatically by
            calling 1-800-223-2413 and the Fund will send the proceeds di-
            rectly to your Fund bank account. Please refer to "How to Redeem"
            below for details.
 
 
EXPEDITED
WIRE        If a shareholder has given authorization for expedited wire re-
TRANSFER    demption, shares can be redeemed and the proceeds sent by federal
REDEMPTIONS wire transfer to a single previously designated bank account. Re-
            quests received by the Trust prior to the close of the Exchange
            will result in shares being redeemed that day at the next deter-
            mined net asset value (less any CDSC) and normally the proceeds
            being sent to the designated bank account the following business
            day. The bank must be a member of the Federal Reserve wire system.
            Delivery of the proceeds of a wire redemption request may be de-
            layed by the Trust for up to 7 days if the Distributor deems it
            appropriate under then current market conditions. Once authoriza-
            tion is on file, the Trust will honor requests by any person iden-
            tifying himself as the owner of an account or the owner's broker
            by telephone at 800-426-0107 or by written instructions. The Trust
            cannot be responsible for the efficiency of
 
52
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            the Federal Reserve wire system or the shareholder's bank. The
            Trust does not currently charge for wire transfers. The share-
            holder is responsible for any charges imposed by the shareholder's
            bank. The minimum amount that may be wired is $2,500. The Trust
            reserves the right to change this minimum or to terminate the wire
            redemption privilege. Shares purchased by check may not be re-
            deemed by wire transfer until such shares have been owned (i.e.,
            paid for) for at least 15 days. Expedited wire transfer redemp-
            tions may be authorized by completing a form available from the
            Distributor. Wire redemptions may not be used to redeem shares in
            certificated form. To change the name of the single bank account
            designated to receive wire redemption proceeds, it is necessary to
            send a written request with signatures guaranteed to PIMCO Funds
            Distributors LLC, P.O. Box 5866, Denver, CO 80217-5866. See "How
            to Buy Shares-- Signature Guarantee." This redemption option does
            not apply to shares held in broker "street name" accounts.
 
 
CERTIFICATEDTo redeem shares for which certificates have been issued, the cer-
SHARES      tificates must be mailed to or deposited with the Trust, duly en-
            dorsed or accompanied by a duly endorsed stock power or by a writ-
            ten request for redemption. Signatures must be guaranteed as de-
            scribed under "How to Buy Shares--Signature Guarantee." Further
            documentation may be requested from institutions or fiduciary ac-
            counts, such as corporations, custodians (e.g., under the Uniform
            Gifts to Minors Act), executors, administrators, trustees or
            guardians ("institutional account owners"). The redemption request
            and stock power must be signed exactly as the account is regis-
            tered, including indication of any special capacity of the regis-
            tered owner.
 
 
AUTOMATIC   An investor who owns or buys shares of a Fund having a net asset
WITHDRAWAL  value of $10,000 or more may open an Automatic Withdrawal Plan and
PLAN        have a designated sum of money (not less than $100 per Fund) paid
            monthly (or quarterly) to the investor or another person. Such a
            plan may be established by completing the appropriate section of
            the Account Application or you may obtain an Automatic Withdrawal
            Plan Application from the Distributor or your broker. If an Auto-
            matic Withdrawal Plan is set up after the account is established
            providing for payment to a person other than the record share-
            holder or to an address other than the address of record, a signa-
            ture guarantee is required. See "How to Buy Shares--Signature
            Guarantee." Class A, Class B and Class C shares of any Fund are
            deposited in a plan account and all distributions are reinvested
            in additional shares of that class of the Fund at net asset value.
            Shares in a plan account are then redeemed at net asset value
            (less any applicable CDSC) to make each withdrawal payment. Any
            applicable CDSC may be waived for certain redemptions under an Au-
            tomatic Withdrawal Plan. See "Alternative Purchase Arrangements--
            Waiver of Contingent Deferred Sales Charges."
               Redemptions for the purpose of withdrawals are ordinarily made
            on the business day preceding the day of payment at that day's
            closing net asset value and checks are mailed on the day of pay-
            ment selected by the shareholder. The Transfer Agent may acceler-
            ate the redemption and check mailing date by one day to avoid
            weekend delays. Payment will be made to any person the investor
            designates; however, if the shares are registered in the name of a
            trustee or other fiduciary, payment will be made only to the fidu-
            ciary, except in the case of a profit-sharing or pension plan
            where payment will be made to the designee. As withdrawal payments
            may include a return of principal, they cannot be considered a
            guaranteed annuity or actual yield of income to the investor. The
            redemption of shares in connection with an Automatic Withdrawal
            Plan may result in a gain or loss for tax purposes. Continued
            withdrawals in excess of income will reduce and possibly exhaust
            invested principal, especially in the event of a market decline.
            The maintenance of an Automatic Withdrawal Plan concurrently with
            purchases of additional shares of the Fund would be disadvanta-
            geous to the investor because of the CDSC that may become payable
            on such withdrawals in the case of Class A, Class B or Class C
            shares and because of the initial sales charge in the case of
            Class A shares. For this reason, the minimum investment accepted
            for a Fund while an Automatic Withdrawal Plan is in effect for
            that Fund is $1,000, and an investor may not maintain a plan for
            the accumulation of shares of the Fund (other than through rein-
            vestment of distributions) and an Automatic Withdrawal Plan at the
            same time. The Trust or the Distributor may terminate or change
            the terms of the Automatic Withdrawal Plan at any time.
                                                     August 1, 1998 Prospectus
                                                                              53
<PAGE>
 
               Because the Automatic Withdrawal Plan may involve invasion of
            capital, investors should consider carefully with their own finan-
            cial advisers whether the plan and the specified amounts to be
            withdrawn are appropriate in their circumstances. The Trust and
            the Distributor make no recommendations or representations in this
            regard.
 
            Distributor and Distribution and Servicing Plans
 
            The Distributor, a wholly owned subsidiary of PIMCO Advisors L.P.,
            is the principal underwriter of the Trust's shares and in that
            connection makes distribution and servicing payments to partici-
            pating brokers and servicing payments to certain banks and other
            financial intermediaries in connection with the sale of Class B
            and Class C shares and servicing payments to participating bro-
            kers, certain banks and other financial intermediaries in connec-
            tion with the sale of Class A shares. In the case of Class A
            shares, these parties are also compensated based on the amount of
            the front-end sales charge reallowed by the Distributor, except in
            cases where Class A shares are sold without a front-end sales
            charge. In the case of Class B shares, participating brokers and
            other financial intermediaries are compensated by an advance of a
            sales commission by the Distributor. In the case of Class C
            shares, part or all of the first year's distribution and servicing
            fee is generally paid at the time of sale. Pursuant to a Distribu-
            tion Contract with the Trust, with respect to each Fund's Class A,
            Class B and Class C shares, the Distributor bears various other
            promotional and sales related expenses, including the cost of
            printing and mailing prospectuses to persons other than current
            shareholders. The Distributor, located at 2187 Atlantic Street,
            Stamford, Connecticut 06902, is a broker-dealer registered with
            the Securities and Exchange Commission.
 
            CLASS A SERVICING FEES As compensation for services rendered and
            expenses borne by the Distributor in connection with personal
            services rendered to Class A shareholders of the Trust and the
            maintenance of Class A shareholder accounts, the Trust pays the
            Distributor servicing fees up to the annual rates set forth below
            (calculated as a percentage of each Fund's average daily net as-
            sets attributable to Class A shares):
 
 
<TABLE>
<CAPTION>
                                  SERVICING
           FUND                   FEE
              -----------------------------
           <S>                    <C>
           All Funds except the
            Money Market Fund     .25%
              -----------------------------
           Money Market Fund*     .10%
</TABLE>
 
 
            *Subject to increase by action of the Trust's Trustees to a rate
            not exceeding .25% per annum. Also, subject to increase to a rate
            not exceeding .20% if the Distributor ceases to voluntarily waive
            any portion of the fee.
 
            CLASS B DISTRIBUTION AND SERVICING FEES As compensation for serv-
            ices rendered and expenses borne by the Distributor in connection
            with the distribution of Class B shares of the Trust and, in con-
            nection with personal services rendered to Class B shareholders of
            the Trust and the maintenance of Class B shareholder accounts, the
            Trust pays the Distributor servicing fees and distribution fees up
            to the annual rates set forth below (calculated as a percentage of
            each Fund's average daily net assets attributable to Class B
            shares):
 
 
<TABLE>
<CAPTION>
                      SERVICING DISTRIBUTION
           FUND       FEE       FEE
              ------------------------------
           <S>        <C>       <C>
           All Funds  .25%      .75%
</TABLE>
 
            CLASS C DISTRIBUTION AND SERVICING FEES As compensation for serv-
            ices rendered and expenses borne by the Distributor in connection
            with the distribution of Class C shares of the Trust and, in con-
            nection with personal services rendered to Class C shareholders of
            the Trust and the maintenance of Class C shareholder accounts, the
            Trust pays the Distributor
 
54
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            servicing fees and distribution fees up to the annual rates set
            forth below (calculated as a percentage of each Fund's average
            daily net assets attributable to Class C shares):
 
 
<TABLE>   
<CAPTION>
                             SERVICING DISTRIBUTION
           FUND              FEE       FEE
              -------------------------------------
           <S>               <C>       <C>
           Total Return,
            High Yield,
            Long-Term U.S.
            Government,
            Global Bond II,
            Foreign Bond
            and Emerging
            Markets Bond
            Funds            .25%      .75%
              -------------------------------------
           Low Duration,
            Real Return
            Bond, Municipal
            Bond and
            StocksPLUS
            Funds*           .25%      .50%
              -------------------------------------
           Short-Term Fund*  .25%      .30%
              -------------------------------------
           Money Market
            Fund*            .10%      .00%
</TABLE>    
               
            *Subject to increase by action of the Trust's Trustees to a rate
            not exceeding .75% per annum with respect to the distribution fee
            on shares of the Low Duration and Money Market Funds, and .25% per
            annum with respect to the servicing fee on shares of the Money
            Market Fund. With respect to the servicing fee on shares of the
            Money Market Fund, such fee is subject to increase to a rate of
            .20% if the Distributor ceases to voluntarily waive any portion of
            the fee. With respect to the distribution fee on shares of each of
            the Short-Term, Real Return Bond, Municipal Bond and StocksPLUS
            Funds, such fee is subject to an increase to a rate of .75% if the
            Distributor ceases to voluntarily waive any portion of the fee.
                
               The Class A servicing fees and Class B and Class C distribution
            and servicing fees paid to the Distributor are made under Distri-
            bution and Servicing Plans adopted pursuant to Rule 12b-l under
            the 1940 Act and are of the type known as "compensation" plans.
            This means that, although the Trustees of the Trust are expected
            to take into account the expenses of the Distributor and its pred-
            ecessors in their periodic review of the Distribution and Servic-
            ing Plans, the fees are payable to compensate the Distributor for
            services rendered even if the amount paid exceeds the Distribu-
            tor's expenses.
               The distribution fee applicable to Class B and Class C shares
            may be spent by the Distributor on any activities or expenses pri-
            marily intended to result in the sale of Class B or Class C
            shares, respectively, including compensation to, and expenses (in-
            cluding overhead and telephone expenses) of, financial consultants
            or other employees of the Distributor or of participating or in-
            troducing brokers who engage in distribution of Class B or Class C
            shares, printing of prospectuses and reports for other than exist-
            ing Class B or Class C shareholders, advertising, and preparation,
            printing and distribution of sales literature. The servicing fee,
            applicable to Class A, Class B and Class C shares of the Trust,
            may be spent by the Distributor on personal services rendered to
            shareholders of the Trust and the maintenance of shareholder ac-
            counts, including compensation to, and expenses (including tele-
            phone and overhead expenses) of, financial consultants or other
            employees of participating or introducing brokers, certain banks
            and other financial intermediaries who aid in the processing of
            purchase or redemption requests or the processing of dividend pay-
            ments, who provide information periodically to shareholders show-
            ing their positions in a Fund's shares, who forward communications
            from the Trust to shareholders, who render ongoing advice concern-
            ing the suitability of particular investment opportunities offered
            by the Trust in light of the shareholders' needs, who respond to
            inquiries from shareholders relating to such services, or who
            train personnel in the provision of such services. Distribution
            and servicing fees may also be spent on interest relating to
            unreimbursed distribution or servicing expenses from prior years.
               Many of the Distributor's sales and servicing efforts involve
            the Trust as a whole, so that fees paid by Class A, Class B or
            Class C shares of any Fund may indirectly support sales and ser-
            vicing efforts relating to the other Funds' shares of the same
            class. In reporting its expenses to the Trustees, the Distributor
            itemizes expenses that relate to the distribution and/or servicing
            of a single Fund's shares, and allocates other expenses among the
            Funds based on their relative net assets. Expenses allocated to
            each Fund are further allocated among its classes of shares annu-
            ally based on the relative sales of each class, except for any ex-
            penses that relate only to the sale or servicing of a single
            class. The
                                                     August 1, 1998 Prospectus
                                                                              55
<PAGE>
 
            Distributor may make payments to brokers (and with respect to ser-
            vicing fees only, to certain banks and other financial intermedi-
            aries) of up to the following percentages annually of the average
            daily net assets attributable to shares in the accounts of their
            customers or clients:
 
 
              CLASS A SHARES
 
<TABLE>
<CAPTION>
                                  SERVICING
                                  FEE(/1/)
              -----------------------------
           <S>                    <C>
           All Funds except the
            Money Market Fund     .25%
              -----------------------------
           Money Market Fund      .10%
</TABLE>
 
 
 
              CLASS B SHARES(/2/)
 
<TABLE>
<CAPTION>
                      SERVICING
                      FEE
              -----------------
           <S>        <C>
           All Funds  .25%
</TABLE>
 
 
 
              CLASS C SHARES--
              PURCHASED ON OR AFTER
              7/1/91(/3/)
 
<TABLE>
<CAPTION>
                            SERVICING DISTRIBUTION
                            FEE(/1/)  FEE(/1/)
              ------------------------------------
           <S>              <C>       <C>
           Total Return,
            High Yield,
            Long-Term U.S.
            Government,
            Global Bond II,
            Foreign Bond
            and Emerging
            Markets Bond
            Funds           .25%      .65%
              ------------------------------------
           Low Duration,
            Real Return
            Bond, Municipal
            Bond and
            StocksPLUS
            Funds           .25%      .45%
              ------------------------------------
           Short-Term Fund  .25%      .25%
              ------------------------------------
           Money Market
            Fund            .10%      .00%
</TABLE>
 
 
 
              CLASS C SHARES--
              PURCHASED BEFORE 7/1/91
 
<TABLE>
<CAPTION>
                                  SERVICING
                                  FEE(/1/)
              -----------------------------
           <S>                    <C>
           All Funds except the
            Money Market Fund     .25%
              -----------------------------
           Money Market Fund      .10%
</TABLE>
 
            1. Applies, in part, to Class A, Class B and Class C shares of the
            Trust issued to former shareholders of PIMCO Advisors Funds in
            connection with the reorganizations/mergers of series of PIMCO Ad-
            visors Funds as/with Funds of the Trust in a transaction which
            took place on January 17, 1997.
            2. Payable only with respect to shares outstanding for one year or
            more.
            3. Payable only with respect to shares outstanding for one year or
            more except in the case of shares for which no payment is made to
            the party at the time of sale.
 
               The Distributor may from time to time pay additional cash bo-
            nuses or other incentives to selected participating brokers in
            connection with the sale or servicing of Class A, Class B and
            Class C shares of the Funds. On some occasions, such bonuses or
            incentives may be conditioned upon the sale of a specified minimum
            dollar amount of the shares of a Fund and/or all of the Funds to-
            gether or a particular class of shares, during a specific period
            of time. The Distributor currently expects that such additional
            bonuses or incentives will not exceed .50% of the amount of any
            sale. Pacific Investment Management (in its capacity as adminis-
            trator) may also pay participating brokers and other intermediar-
            ies for transfer agency and other services.
               If in any year the Distributor's expenses incurred in connec-
            tion with the distribution of Class B and Class C shares and, for
            Class A, Class B and Class C Shares, in connection with the ser-
            vicing of shareholders and the maintenance of shareholder ac-
            counts, exceed the distribution and/or servicing fees paid by the
            Trust, the Distributor would recover such excess only if the Dis-
            tribution and Servicing Plan with respect to such class of shares
            continues to be in
 
56
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            effect in some later year when the distribution and/or servicing
            fees exceed the Distributor's expenses. The Trust is not obligated
            to repay any unreimbursed expenses that may exist at such time, if
            any, as the relevant Distribution and Servicing Plan terminates.
               
               From time to time, expenses of principal underwriters incurred
            in connection with the sale of shares of the Funds and in connec-
            tion with the servicing of shareholders of the Funds and the main-
            tenance of shareholder accounts may exceed the distribution and
            servicing fees collected by the Distributor. As of March 31, 1998,
            such expenses were approximately $2,927,000 in excess of payments
            under the Funds' Class A Distribution and Servicing Plan,
            $12,538,000 in excess of payments under the Funds' Class B Distri-
            bution and Servicing Plan, and $222,000 in excess of payments un-
            der the Funds' Class C Distribution and Servicing Plan.     
 
            How Net Asset Value Is Determined
               
            The net asset values of Class A, Class B and Class C shares of
            each Fund will be determined once on each day on which the Ex-
            change is open as of the close of regular trading (normally 4:00
            p.m., Eastern time) on the Exchange. Net asset value will not be
            determined on days on which the Exchange is closed.     
               The Money Market Fund's securities are normally valued using
            the amortized cost method of valuation. This involves valuing a
            security at cost on the date of acquisition and thereafter assum-
            ing a constant accretion of a discount or amortization of a pre-
            mium to maturity. See the Statement of Additional Information for
            a description of certain conditions and procedures followed by the
            Money Market Fund in connection with amortized cost valuation. For
            all other Funds, portfolio securities and other assets for which
            market quotations are readily available are stated at market val-
            ue. Market value is determined on the basis of last reported sales
            prices, or if no sales are reported, as is the case for most secu-
            rities traded over-the-counter, at the mean between representative
            bid and asked quotations obtained from a quotation reporting sys-
            tem or from established market makers. Fixed income securities,
            including those to be purchased under firm commitment agreements
            (other than obligations having a maturity of 60 days or less), are
            normally valued on the basis of quotations obtained from brokers
            and dealers or pricing services, which take into account appropri-
            ate factors such as institutional-sized trading in similar groups
            of securities, yield, quality, coupon rate, maturity, type of is-
            sue, trading characteristics, and other market data.
               Quotations of foreign securities in foreign currency are con-
            verted to U.S. dollar equivalents using foreign exchange quota-
            tions received from independent dealers. Short-term investments
            having a maturity of 60 days or less are valued at amortized cost,
            when the Board of Trustees determines that amortized cost is their
            fair value. Certain fixed income securities for which daily market
            quotations are not readily available may be valued, pursuant to
            guidelines established by the Board of Trustees, with reference to
            fixed income securities whose prices are more readily obtainable
            and whose durations are comparable to the securities being valued.
            Subject to the foregoing, other securities for which market quota-
            tions are not readily available are valued at fair value as deter-
            mined in good faith by the Board of Trustees.
               Each Fund's liabilities are allocated among its classes. The
            total of such liabilities allocated to a class plus that class's
            distribution and/or servicing fees and any other expenses spe-
            cially allocated to that class are then deducted from the class's
            proportionate interest in the Fund's assets, and the resulting
            amount for each class is divided by the number of shares of that
            class outstanding to produce the class's "net asset value" per
            share. Under certain circumstances, the per share net asset value
            of the Class B and Class C shares of the Funds that do not declare
            regular income dividends on a daily basis may be lower than the
            per share net asset value of the Class A shares as a result of the
            daily expense accruals of the distribution fee applicable to the
            Class B and Class C shares. Generally, for Funds that pay income
            dividends, those dividends are expected to differ over time by ap-
            proximately the amount of the expense accrual differential between
            a particular Fund's classes.
 
                                                     August 1, 1998 Prospectus
                                                                              57
<PAGE>
 
            Distributions
 
            Each Fund pays out as dividends substantially all of its net in-
            vestment income (which comes from dividends and interest it re-
            ceives or is deemed to receive from its investments) and net real-
            ized short-term capital gains. For these purposes and for federal
            income tax purposes, a portion of the premiums from certain ex-
            pired call or put options written by the Fund, net gains from
            closing purchase and sale transactions with respect to such op-
            tions, and net gains from futures transactions are treated as
            short-term capital gains. Each Fund distributes substantially all
            of its net realized capital gains, if any, after giving effect to
            any available capital loss carry-over.
               Shares begin earning dividends on the day after the date that
            funds are received by the Trust for the purchase of shares. For
            the Fixed Income Funds, dividends are declared daily from net in-
            vestment income to shareholders of record at the close of the pre-
            vious business day, and distributed to shareholders monthly. The
            StocksPLUS Fund intends to declare and pay as a dividend substan-
            tially all of its net investment income on a quarterly basis. Any
            net realized capital gains from the sale of portfolio securities
            will be distributed no less frequently than once yearly. Dividend
            and capital gain distributions of a Fund will be reinvested in ad-
            ditional shares of that Fund unless the shareholder elects to have
            them paid in cash. There are no sales charges on reinvested divi-
            dends. If a shareholder has elected to receive dividends and/or
            capital gain distributions in cash and the postal or other deliv-
            ery service is unable to deliver checks to the shareholder's ad-
            dress of record, such shareholder's distributions will automati-
            cally be invested in the Money Market Fund until such shareholder
            is located. Dividends from net investment income with respect to
            Class B and Class C shares are expected to be lower than those
            paid with respect to Class A shares as a result of the distribu-
            tion fees applicable to Class B and C shares.
               Shareholders may elect to invest dividends and/or distributions
            paid by any Fund in shares of the same class of any other Fund of
            the Trust at net asset value. The shareholder must have an account
            existing in the Fund selected for investment with the identical
            registered name and address and must elect this option on the ac-
            count application, on a form provided for that purpose or by a
            telephone request to the Transfer Agent at 800-426-0107. For fur-
            ther information on this option, contact your broker or call the
            Distributor at 800-426-0107.
 
            Taxes
 
            Each Fund intends to qualify as a regulated investment company an-
            nually and to elect to be treated as a regulated investment com-
            pany under the Code. As such, a Fund generally will not pay fed-
            eral income tax on the income and gains it pays as dividends to
            its shareholders. In order to avoid a 4% federal excise tax, each
            Fund intends to distribute each year substantially all of its net
            income and gains.
               Shareholders subject to U.S. federal income tax will be subject
            to tax on dividends received from a Fund, regardless of whether
            received in cash or reinvested in additional shares. Distributions
            received by tax-exempt shareholders will not be subject to federal
            income tax to the extent permitted under applicable tax law. All
            shareholders must treat dividends, other than capital gain divi-
            dends or dividends that represent a return of capital to share-
            holders, as ordinary income.
               
               Dividends designated by a Fund as capital gain dividends de-
            rived from the Fund's net capital gain (that is, the excess of net
            long-term gain over net short-term loss) are taxable to sharehold-
            ers as long-term capital gain except as provided by an applicable
            tax exemption. Any distributions that are not from a Fund's net
            investment income, short-term capital gain, or net capital gain
            may be characterized as a return of capital to shareholders or, in
            some cases, as capital gain. Certain dividends declared in Octo-
            ber, November or December of a calendar year are taxable to share-
            holders (who are subject to tax on dividends) as though received
            on December 31 of that year if paid to shareholders during January
            of the following calendar year. Each Fund will advise shareholders
            annually of the amount and nature of the dividends paid to them.
                
58
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               Dividends paid to shareholders by the Municipal Bond Fund which
            are derived from interest on Municipal Bonds are expected to be
            designated by the Fund as "exempt-interest dividends," and share-
            holders may generally exclude such dividends from gross income for
            federal income tax purposes. However, if a shareholder receives
            social security or railroad retirement benefits, the shareholder
            may be taxed on a portion of those benefits as a result of receiv-
            ing tax-exempt income. In addition, certain exempt-interest divi-
            dends could, as discussed below, cause certain shareholders to be-
            come subject to the alternative minimum tax and may increase the
            alternative minimum tax liability of shareholders already subject
            to this tax.
               To the extent that dividends paid to shareholders by the Munic-
            ipal Bond Fund are derived from taxable interest or from capital
            gains, such dividends will be subject to federal income tax. Any
            gain realized on a redemption of shares will be taxable gain, sub-
            ject to any applicable tax exemption for which an investor may
            qualify.
               
               Dividends derived from interest on certain U.S. Government se-
            curities may be exempt from state and local taxes, although inter-
            est on mortgage-backed U.S. Government securities (for example,
            interest on FNMA and GNMA Certificates) is generally not so ex-
            empt. The distributions of "exempt-interest dividends" paid by the
            Municipal Bond Fund may be exempt from state and local taxation
            when received by a shareholder to the extent that they are derived
            from interest on Municipal Bonds issued by the state or political
            subdivision in which such shareholder resides. The federal exemp-
            tion for "exempt-interest dividends" attributable to Municipal
            Bonds does not necessarily result in exemption of such dividends
            from income for the purpose of state and local taxes. The Trust
            will report annually on a state-by-state basis the source of in-
            come the Municipal Bond Fund receives on Municipal Bonds that was
            paid out as dividends during the preceding year.     
               The Code also provides that exempt-interest dividends allocable
            to interest received from "private activity bonds" issued after
            August 7, 1986 are an item of tax preference for individual and
            corporate alternative minimum tax at the applicable rate for indi-
            viduals and corporations. Therefore, if the Municipal Bond Fund
            invests in such private activity bonds, certain of its sharehold-
            ers may become subject to the alternative minimum tax on that part
            of its distributions to them that are derived from interest income
            on such bonds, and certain shareholders already subject to such
            tax may have increased liability therefor. However, it is the
            present policy of the Municipal Bond Fund to invest no more than
            20% of its assets in such bonds. Other provisions of the Code af-
            fect the tax treatment of distributions from the Municipal Bond
            Fund for corporations, casualty insurance companies, and financial
            institutions. In particular, under the Code, for corporations, al-
            ternative minimum taxable income will be increased by a percentage
            of the amount by which the corporation's "adjusted current earn-
            ings" (which includes various items of tax exempt income) exceeds
            the amount otherwise determined to be alternative minimum taxable
            income. Accordingly, an investment in the Municipal Bond Fund may
            cause shareholders to be subject to (or result in an increased li-
            ability under) the alternative minimum tax.
               Dividends to shareholders of the Municipal Bond Fund derived
            from money market instruments and U.S. Government securities are
            generally taxable as ordinary income. The Fund may seek to reduce
            fluctuations in its net asset value by engaging in portfolio
            strategies involving options on securities, futures contracts, and
            options on futures contracts. Any gain derived by the Fund from
            the use of such instruments, including by reason of "marking to
            market," will be treated as a combination of short-term and long-
            term capital gain and, if not offset by realized capital losses
            incurred by the Fund, will be distributed to shareholders (possi-
            bly requiring the liquidation of other portfolio securities) and
            will be taxable to shareholders as a combination of ordinary in-
            come and long-term capital gain.
               
               Interest accrued by a Fund from inflation-indexed bonds will be
            includable in the Fund's gross income in the period in which it
            accrues. Periodic adjustments for inflation in the principal value
            of these securities also may give rise to original issue discount,
            which, likewise, will be includable in the Fund's gross income on
            a current basis, regardless of whether the Fund receives any cash
            payments. See "Taxation--Original Issue Discount" in the Statement
            of Additional Information. Amounts includable in a Fund's gross
            income become subject to tax-related distribution requirements.
            Accordingly, a Fund may be required to make annual distributions
            to shareholders in excess of the cash received in a given period
            from these investments. As a result, the Fund may be required to
            liquidate certain investments at a time when it is not advanta-
            geous to do so. If the principal value of an inflation-indexed
            bond is adjusted downward in     
 
                                                                             59
                                                     August 1, 1998 Prospectus
<PAGE>
 
            any period as a result of deflation, the reduction may be treated
            as a loss to the extent the reduction exceeds coupon payments re-
            ceived in that period; in that case, the amount distributable by
            the Fund may be reduced and amounts distributed previously in the
            taxable year may be characterized in some circumstances as a re-
            turn of capital.
               Taxable shareholders should note that the timing of their in-
            vestment could have undesirable tax consequences. If shares are
            purchased on or just before the record date of a dividend, taxable
            shareholders will pay full price for the shares and may receive a
            portion of their investment back as a taxable distribution.
               The preceding discussion relates only to federal income tax;
            the consequences under other tax laws may differ. For additional
            information relating to the tax aspects of investing in a Fund,
            see the Statement of Additional Information.
 
            Management of the Trust
 
            The business affairs of the Trust are managed under the direction
            of the Board of Trustees. The Trustees are Guilford C. Babcock, R.
            Wesley Burns, Vern O. Curtis, Brent R. Harris, Thomas P. Kemp, and
            William J. Popejoy. Additional information about the Trustees and
            the Trust's executive officers may be found in the Statement of
            Additional Information under the heading "Management--Trustees and
            Officers."
            
INVESTMENT  Pacific Investment Management serves as investment adviser ("Ad-
ADVISER     viser") to the Funds pursuant to an investment advisory contract.
            The Adviser is an investment management company founded in 1971,
            and had approximately $138 billion in assets under management as
            of June 30, 1998.     
               
               Pacific Investment Management is a subsidiary of PIMCO Advisors
            L.P. ("PIMCO Advisors"). The general partners of PIMCO Advisors
            are PIMCO Partners, G.P. and PIMCO Advisors Holdings L.P. PIMCO
            Partners, G.P. is a general partnership between PIMCO Holding LLC,
            a Delaware limited liability company and an indirect wholly-owned
            subsidiary of Pacific Life Insurance Company, and PIMCO Partners
            LLC, a California limited liability company controlled by the Man-
            aging Directors of Pacific Investment Management. PIMCO Partners,
            G.P. is the sole general partner of PIMCO Advisors Holdings L.P.
            Pacific Investment Management's address is 840 Newport Center
            Drive, Suite 300, Newport Beach, California 92660. Pacific Invest-
            ment Management is registered as an investment adviser with the
            Securities and Exchange Commission and as a commodity trading ad-
            visor with the CFTC.     
               
               The Adviser manages the investment and reinvestment of the as-
            sets of each Fund. The Adviser is responsible for placing orders
            for the purchase and sale of each Fund's investments directly with
            brokers or dealers selected by it in its discretion. See "Portfo-
            lio Transactions" in the Statement of Additional Information.     
 
60
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               Information about the individual portfolio managers responsible
            for management of the Trust's currently operational Funds offered
            in this Prospectus, including their occupations for the past five
            years, is provided below.
 
<TABLE>
<CAPTION>
                                          PORTFOLIO MANAGER AND BUSINESS
           FUND                           EXPERIENCE (PAST FIVE YEARS)
              -----------------------------------------------------------------
           <C>                            <S>
           MONEY MARKET FUND              Leslie Barbi, Senior Vice President,
                                          Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Ms.
                                          Barbi has managed the Money Market
                                          Fund since November 1, 1995. Prior to
                                          joining Pacific Investment Management
                                          in 1993, Ms. Barbi was associated
                                          with Salomon Brothers as a proprie-
                                          tary Portfolio Manager.
              -----------------------------------------------------------------
           SHORT-TERM FUND                William H. Gross, Managing Director,
           LOW DURATION FUND              Pacific Investment Management. A
           TOTAL RETURN FUND              Fixed Income Portfolio Manager, Mr.
           STOCKSPLUS FUND                Gross is one of the founders of Pa-
                                          cific Investment Management and has
                                          managed the Total Return and Low Du-
                                          ration Funds since their inception,
                                          May 11, 1987. Mr. Gross is the leader
                                          of the team which has managed the
                                          Short-Term and StocksPLUS Funds since
                                          January 6, 1998.
              -----------------------------------------------------------------
           REAL RETURN BOND FUND          John Brynjolfsson, Vice President,
                                          Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Brynjolfsson joined Pacific Invest-
                                          ment Management in 1989, and has man-
                                          aged the Real Return Bond Fund since
                                          its inception, January 29, 1997.
              -----------------------------------------------------------------
           HIGH YIELD FUND                Benjamin Trosky, Managing Director,
                                          Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Trosky joined Pacific Investment
                                          Management in 1990 and has managed
                                          the High Yield Fund since its incep-
                                          tion, December 16, 1992.
              -----------------------------------------------------------------
           MUNICIPAL BOND FUND            Benjamin Ehlert, Executive Vice Pres-
                                          ident, PIMCO. A Fixed Income Portfo-
                                          lio Manager, Mr. Ehlert has been as-
                                          sociated with PIMCO for over 23
                                          years.
              -----------------------------------------------------------------
           LONG-TERM U.S. GOVERNMENT FUND Pasi Hamalainen, Executive Vice Pres-
                                          ident, Pacific Investment Management.
                                          A Fixed Income Portfolio Manager, Mr.
                                          Hamalainen joined Pacific Investment
                                          Management in 1994 and has managed
                                          the Long-Term U.S. Government Fund
                                          since July 1, 1997.
              -----------------------------------------------------------------
           GLOBAL BOND FUND II            Lee R. Thomas, III, Managing Director
           FOREIGN BOND FUND              and Senior International Portfolio
                                          Manager, Pacific Investment Manage-
                                          ment. A Fixed Income Portfolio
                                          Manager, Mr. Thomas has managed the
                                          Foreign Bond Fund since July 13,
                                          1995, and the Global Bond Fund II
                                          since October 1, 1995. Prior to join-
                                          ing Pacific Investment Management in
                                          1995, Mr. Thomas was associated with
                                          Investcorp as a member of the manage-
                                          ment committee responsible for global
                                          securities and foreign exchange trad-
                                          ing. Prior to Investcorp, he was as-
                                          sociated with Goldman Sachs as an Ex-
                                          ecutive Director in foreign fixed in-
                                          come.
              -----------------------------------------------------------------
           EMERGING MARKETS BOND FUND     Michael J. Rosborough, Senior Vice
                                          President, Pacific Investment Manage-
                                          ment. A Fixed Income Portfolio Manag-
                                          er, Mr. Rosborough was associated
                                          with RBC Dominion in Tokyo as a Vice
                                          President and Manager in foreign
                                          fixed income prior to joining Pacific
                                          Investment Management in 1994.
</TABLE>
 
 
 
FUND
ADMINISTRATOR
            Pacific Investment Management also serves as administrator for the
            Funds' Class A, Class B and Class C shares pursuant to an adminis-
            tration agreement with the Trust. Pacific Investment Management
            provides administrative services for Class A, Class B and Class C
            shareholders of the Funds, which include clerical help and ac-
            counting, bookkeeping, internal audit services, and certain other
            services required by the Funds, preparation of reports to the
            Funds' shareholders and regulatory filings. Pacific Investment
            Management may also retain certain of its affiliates to provide
            certain of these services. In addition, Pacific Investment Manage-
            ment, at its own expense, arranges for the provision of legal, au-
            dit, custody, transfer agency (including sub-transfer agency and
            other administrative services) and other services for the Funds,
            and is responsible for the costs of registration of the Trust's
            shares and the printing of prospectuses and shareholder reports
            for current shareholders.
               The Funds (and not Pacific Investment Management) are responsi-
            ble for the following expenses: (i) salaries and other compensa-
            tion of any of the Trust's executive officers and employees who
            are not officers, directors, stockholders or employees of Pacific
            Investment Management or its subsidiaries or affiliates; (ii)
            taxes and governmental fees; (iii) brokerage fees and commissions
            and other portfolio transaction expenses; (iv) the costs of bor-
            rowing money, including
 
                                                                             61
                                                     August 1, 1998 Prospectus
<PAGE>
 
 
            interest expenses; (v) fees and expenses of the Trustees who are
            not "interested persons" of Pacific Investment Management or the
            Trust, and any counsel retained exclusively for their benefit;
            (vi) extraordinary expenses, including costs of litigation and in-
            demnification expenses; (vii) expenses, such as organizational ex-
            penses, which are capitalized in accordance with generally ac-
            cepted accounting principles; and (viii) any expenses allocated or
            allocable to a specific class of shares, which include distribu-
            tion and servicing fees payable with respect to Class A, Class B
            and Class C shares, and may include certain other expenses as per-
            mitted by the Trust's Multi-Class Plan adopted pursuant to Rule
            18f-3 under the 1940 Act, subject to review and approval by the
            Trustees.
 
 
            The Funds feature fixed advisory and administrative fee rates. For
            providing investment advisory and administrative services to the
            Funds as described above, Pacific Investment Management receives
            monthly fees from each Fund at an annual rate (i) based on the av-
            erage daily net assets of the Fund for advisory fees and, (ii) at-
            tributable in the aggregate to the Fund's Class A, Class B and
            Class C shares for administrative fees, as follows:
ADVISORY
AND
ADMINISTRATIVE
FEES
 
 
<TABLE>
<CAPTION>
                                                  ADVISORY
           FUND                                   FEE RATE
              --------------------------------------------------
           <S>                                    <C>
           Money Market Fund                      .15%
              --------------------------------------------------
           StocksPLUS Fund                        .40%
              --------------------------------------------------
           Emerging Markets Bond Fund             .45%
              --------------------------------------------------
           All other Funds                        .25%
 
 
 
<CAPTION>
                                                  ADMINISTRATIVE
           FUND                                   FEE RATE
              --------------------------------------------------
           <S>                                    <C>
           Money Market, Short-Term and Munici-
            pal Bond Funds                        .35%
              --------------------------------------------------
           Global Bond II and Foreign Bond Funds  .45%
              --------------------------------------------------
           Emerging Markets Bond Fund             .55%
              --------------------------------------------------
           All other Funds                        .40%
</TABLE>
 
 
               Both the investment advisory contract and administration agree-
            ment with respect to Class A, Class B and Class C shares of the
            Funds may be terminated by the Trustees at any time on 60 days'
            written notice. The investment advisory contract may be terminated
            by Pacific Investment Management on 60 days' written notice. Fol-
            lowing the expiration of the one-year period commencing with the
            effectiveness of the administration agreement, it may be
            terminated by Pacific Investment Management on 60 days' written
            notice. Following its initial two-year term, the investment advi-
            sory contract will continue from year to year if approved by the
            Trustees. Following its initial one-year term, the administration
            agreement with respect to Class A, Class B and Class C shares of
            the Funds will continue from year-to-year if approved by the
            Trustees.
 
PORTFOLIO      
TRANSACTIONSPursuant to the advisory contract, the Adviser places orders for
            the purchase and sale of portfolio investments for the Funds' ac-
            counts with brokers or dealers selected by it in its discretion.
            In effecting purchases and sales of portfolio securities for the
            account of the Funds, the Adviser will seek the best price and ex-
            ecution of the Funds' orders. In doing so, a Fund may pay higher
            commission rates than the lowest available when the Adviser be-
            lieves it is reasonable to do so in light of the value of the bro-
            kerage and research services provided by the broker effecting the
            transaction.     
               
               The Adviser manages the Funds without regard generally to re-
            strictions on portfolio turnover, except those imposed on its
            ability to engage in short-term trading by provisions of the fed-
            eral tax laws. The use of certain derivative instruments with rel-
            atively short maturities may tend to exaggerate the portfolio
            turnover rate for some of the Funds. Trading in fixed income secu-
            rities does not generally involve the payment of brokerage commis-
            sions, but does involve indirect transaction costs. The use of
            futures contracts may involve the payment of commissions to
            futures commission merchants. The higher the rate of portfolio
            turnover of a Fund, the higher all these transaction costs borne
            by the Fund     
 
62
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            generally will be. The portfolio turnover rate for each Fund for
            which financial highlights are provided in this Prospectus is set
            forth under "Financial Highlights."
               
               Some securities considered for investments by the Funds may
            also be appropriate for other clients served by the Adviser. If a
            purchase or sale of securities consistent with the investment pol-
            icies of a Fund and one or more of these clients served by the Ad-
            viser is considered at or about the same time, transactions in
            such securities will be allocated among the Fund and clients in a
            manner deemed fair and reasonable by the Adviser. The Adviser may
            aggregate orders for the Funds with simultaneous transactions en-
            tered into on behalf of other clients of the Adviser so long as
            price and transaction expenses are averaged either for that trans-
            action or for the day.     
 
            Description of the Trust
 
 
CAPITALIZATION
            The Trust was organized as a Massachusetts business trust on Feb-
            ruary 19, 1987. The Board of Trustees may establish additional
            portfolios in the future. The capitalization of the Trust consists
            solely of an unlimited number of shares of beneficial interest
            with a par value of $0.0001 each. When issued, shares of the Trust
            are fully paid, non-assessable and freely transferable.
               Under Massachusetts law, shareholders could, under certain cir-
            cumstances, be held personally liable for the obligations of the
            Trust. However, the Declaration of Trust disclaims liability of
            the shareholders, Trustees or officers of the Trust for acts or
            obligations of the Trust, which are binding only on the assets and
            property of the Trust, and requires that notice of the disclaimer
            be given in each contract or obligation entered into or executed
            by the Trust or the Trustees. The Declaration of Trust also pro-
            vides for indemnification out of Trust property for all loss and
            expense of any shareholder held personally liable for the obliga-
            tions of the Trust. The risk of a shareholder incurring financial
            loss on account of shareholder liability is limited to circum-
            stances in which such disclaimer is inoperative or the Trust it-
            self is unable to meet its obligations, and thus should be consid-
            ered remote.
 
 
MULTIPLE       
CLASSES OF  In addition to Class A, Class B and Class C shares, certain Funds
SHARES      also offer Class D, Institutional Class and Administrative Class
            shares through separate prospectuses. See "Alternative Purchase
            Arrangements." These other classes of shares of the Funds may have
            different sales charges and expense levels, which will affect per-
            formance accordingly. This Prospectus relates only to the Class A,
            Class B and Class C shares of the Funds.     
 
VOTING      Shareholders have the right to vote on the election of Trustees
            and on any and all matters on which the law or the Declaration of
            Trust states they may be entitled to vote. The Trust is not re-
            quired to hold regular annual meetings of Trust shareholders and
            does not intend to do so. Shareholders of a class of shares or
            Fund have separate voting rights with respect to matters that only
            affect that class or Fund. See "Other Information--Voting Rights"
            in the Statement of Additional Information.
               The Declaration of Trust provides that the holders of not less
            than two-thirds of the outstanding shares of the Trust may remove
            a person serving as Trustee either by declaration in writing or at
            a meeting called for such purpose. The Trustees are required to
            call a meeting for the purpose of considering the removal of a
            person serving as Trustee if requested in writing to do so by the
            holders of not less than 10% of the outstanding shares of the
            Trust.
               
               Shares entitle their holders to one vote per share (with
            proportionate voting for fractional shares). As of July 7, 1998,
            the following were shareholders of record of at least 25% of the
            outstanding voting securities of the indicated Fund: William
            Barron Hilton, Trustee (Beverly Hills, California) with respect to
            the Short-Term Fund; National Financial Services Corporation (New
            York, New York) with respect to the Real Return Bond Fund; and
            Charles Schwab & Co., Inc. (San Francisco, California) with
            respect to the Foreign Bond Fund. To the extent such shareholders
            are also the beneficial owners of those shares, they may be deemed
            to control (as that term is defined in the 1940 Act) the relevant
            Fund. As used in this Prospectus, the phrase "vote of a majority
            of the outstanding shares" of a Fund (or the Trust) means the vote
            of the lesser of: (1) 67% of the shares of the Fund (or the Trust)
            present at a meeting, if the holders of more than 50% of the
            outstanding shares are present in person or by proxy; or (2) more
            than 50% of the outstanding shares of the Fund (or the Trust).
                
                                                                             63
                                                     August 1, 1998 Prospectus
<PAGE>
 
            Mailings to Shareholders
 
            To reduce the volume of mail shareholders receive, it is antici-
            pated that only one copy of most Trust reports, such as the
            Trust's annual report, will be mailed to a shareholder's household
            (same surname, same address). A shareholder may call 800-227-7337
            if additional shareholder reports are desired.
 
64
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Appendix A
            Description of Duration
               
            Duration is a measure of the expected life of a fixed income secu-
            rity that was developed as a more precise alternative to the con-
            cept of "term to maturity." Traditionally, a fixed income
            security's "term to maturity" has been used as a proxy for the
            sensitivity of the security's price to changes in interest rates
            (which is the "interest rate risk" or "volatility" of the securi-
            ty). However, "term to maturity" measures only the time until a
            fixed income security provides its final payment, taking no ac-
            count of the pattern of the security's payments prior to maturity.
            In contrast, duration incorporates a bond's yield, coupon interest
            payments, final maturity and call features into one measure. Dura-
            tion management is one of the fundamental tools used by the Advis-
            er.     
               Duration is a measure of the expected life of a fixed income
            security on a present value basis. Duration takes the length of
            the time intervals between the present time and the time that the
            interest and principal payments are scheduled or, in the case of a
            callable bond, expected to be received, and weights them by the
            present values of the cash to be received at each future point in
            time. For any fixed income security with interest payments occur-
            ring prior to the payment of principal, duration is always less
            than maturity. In general, all other things being equal, the lower
            the stated or coupon rate of interest of a fixed income security,
            the longer the duration of the security; conversely, the higher
            the stated or coupon rate of interest of a fixed income security,
            the shorter the duration of the security.
               Futures, options and options on futures have durations which,
            in general, are closely related to the duration of the securities
            which underlie them. Holding long futures or call option positions
            (backed by a segregated account of cash and cash equivalents) will
            lengthen a Fund's duration by approximately the same amount that
            holding an equivalent amount of the underlying securities would.
               Short futures or put option positions have durations roughly
            equal to the negative duration of the securities that underlie
            these positions, and have the effect of reducing portfolio dura-
            tion by approximately the same amount that selling an equivalent
            amount of the underlying securities would.
               
               There are some situations where even the standard duration cal-
            culation does not properly reflect the interest rate exposure of a
            security. For example, floating and variable rate securities often
            have final maturities of ten or more years; however, their inter-
            est rate exposure corresponds to the frequency of the coupon re-
            set. For inflation-indexed bonds, duration is calculated on the
            basis of modified real duration, which measures price changes of
            inflation-indexed bonds on the basis of changes in real, rather
            than nominal, interest rates. Another example where the interest
            rate exposure is not properly captured by duration is the case of
            mortgage pass-through securities. The stated final maturity of
            such securities is generally 30 years, but current prepayment
            rates are more critical in determining the securities' interest
            rate exposure. Finally, the duration of a fixed income security
            may vary over time in response to changes in interest rates and
            other market factors. In these and other similar situations, the
            Adviser will use more sophisticated analytical techniques that in-
            corporate the anticipated economic life of a security into the de-
            termination of its interest rate exposure.     
 
                                                                             65
                                                     August 1, 1998 Prospectus
<PAGE>
 
            Appendix B
            Description of Securities Ratings
               
            Certain of the Funds make use of average portfolio credit quality
            standards to assist institutional investors whose own investment
            guidelines limit their investments accordingly. In determining a
            Fund's overall dollar-weighted average quality, unrated securities
            are treated as if rated, based on the Adviser's view of their com-
            parability to rated securities. A Fund's use of average quality
            criteria is intended to be a guide for those institutional invest-
            ors whose investment guidelines require that assets be invested
            according to comparable criteria. Reference to an overall average
            quality rating for a Fund does not mean that all securities held
            by the Fund will be rated in that category or higher. A Fund's in-
            vestments may range in quality from securities rated in the lowest
            category in which the Fund is permitted to invest to securities
            rated in the highest category (as rated by Moody's or S&P or, if
            unrated, determined by the Adviser to be of comparable quality).
            The percentage of a Fund's assets invested in securities in a par-
            ticular rating category will vary. Following is a description of
            Moody's and S&P's ratings applicable to fixed income securities.
                
MOODY'S     CORPORATE AND MUNICIPAL BOND RATINGS
INVESTORS      Aaa: Bonds which are rated Aaa are judged to be of the best
SERVICE,    quality. They carry the smallest degree of investment risk and are
INC.        generally referred to as "gilt edge." Interest payments are pro-
            tected by a large or by an exceptionally stable margin and princi-
            pal is secure. While the various protective elements are likely to
            change, such changes as can be visualized are most unlikely to im-
            pair the fundamentally strong position of such issues.
               Aa: Bonds which are rated Aa are judged to be of high quality
            by all standards. Together with the Aaa group they comprise what
            are generally known as high-grade bonds. They are rated lower than
            the best bonds because margins of protection may not be as large
            as in Aaa securities or fluctuation of protective elements may be
            of greater amplitude or there may be other elements present that
            make the long-term risks appear somewhat larger than with Aaa se-
            curities.
               A: Bonds which are rated A possess many favorable investment
            attributes and are to be considered as upper-medium-grade obliga-
            tions. Factors giving security to principal and interest are con-
            sidered adequate but elements may be present that suggest a sus-
            ceptibility to impairment sometime in the future.
               Baa: Bonds which are rated Baa are considered as medium-grade
            obligations (i.e., they are neither highly protected nor poorly
            secured). Interest payments and principal security appear adequate
            for the present but certain protective elements may be lacking or
            may be characteristically unreliable over any great length of
            time. Such bonds lack outstanding investment characteristics and
            in fact have speculative characteristics as well.
               Ba: Bonds which are rated Ba are judged to have speculative el-
            ements; their future cannot be considered as well-assured. Often
            the protection of interest and principal payments may be very mod-
            erate and thereby not well safeguarded during both good and bad
            times over the future. Uncertainty of position characterizes bonds
            in this class.
               B: Bonds which are rated B generally lack characteristics of a
            desirable investment. Assurance of interest and principal payments
            or of maintenance of other terms of the contract over any long pe-
            riod of time may be small.
               Caa: Bonds which are rated Caa are of poor standing. Such is-
            sues may be in default or there may be present elements of danger
            with respect to principal or interest.
               Ca: Bonds which are rated Ca represent obligations which are
            speculative in a high degree. Such issues are often in default or
            have other marked shortcomings.
               C: Bonds which are rated C are the lowest rated class of bonds
            and issues so rated can be regarded as having extremely poor pros-
            pects of ever attaining any real investment standing.
               Moody's applies numerical modifiers, 1, 2, and 3 in each ge-
            neric rating classified from Aa through B in its corporate bond
            rating system. The modifier 1 indicates that the security ranks in
            the higher end of its generic rating category; the modifier 2 in-
            dicates a mid-range ranking; and the modifier 3 indicates that the
            issue ranks in the lower end of its generic rating category.
 
66
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
            CORPORATE SHORT-TERM DEBT RATINGS
            Moody's short-term debt ratings are opinions of the ability of is-
            suers to repay punctually senior debt obligations which have an
            original maturity not exceeding one year. Obligations relying upon
            support mechanisms such as letters of credit and bonds of indem-
            nity are excluded unless explicitly rated.
               Moody's employs the following three designations, all judged to
            be investment grade, to indicate the relative repayment ability of
            rated issuers:
               PRIME-1: Issuers rated Prime-1 (or supporting institutions)
            have a superior ability for repayment of senior short-term debt
            obligations. Prime-1 repayment ability will often be evidenced by
            many of the following characteristics: leading market positions in
            well-established industries; high rates of return on funds em-
            ployed; conservative capitalization structure with moderate reli-
            ance on debt and ample asset protection; broad margins in earnings
            coverage of fixed financial charges and high internal cash genera-
            tion; and well-established access to a range of financial markets
            and assured sources of alternate liquidity.
               PRIME-2: Issuers rated Prime-2 (or supporting institutions)
            have a strong ability for repayment of senior short-term debt ob-
            ligations. This will normally be evidenced by many of the charac-
            teristics cited above but to a lesser degree. Earnings trends and
            coverage ratios, while sound, may be more subject to variation.
            Capitalization characteristics, while still appropriate, may be
            more affected by external conditions. Ample alternate liquidity is
            maintained.
               PRIME-3: Issuers rated Prime-3 (or supporting institutions)
            have an acceptable ability for repayment of senior short-term ob-
            ligations. The effect of industry characteristics and market com-
            positions may be more pronounced. Variability in earnings and
            profitability may result in changes in the level of debt protec-
            tion measurements and may require relatively high financial lever-
            age. Adequate alternate liquidity is maintained.
               NOT PRIME: Issuers rated Not Prime do not fall within any of
            the Prime rating categories.
 
 
STANDARD &  CORPORATE AND MUNICIPAL BOND RATINGS
POOR'S
RATINGS
SERVICES
 
            INVESTMENT GRADE
               AAA: Debt rated AAA has the highest rating assigned by S&P. Ca-
            pacity to pay interest and repay principal is extremely strong.
               AA: Debt rated AA has a very strong capacity to pay interest
            and repay principal and differs from the highest rated issues only
            in small degree.
               A: Debt rated A has a strong capacity to pay interest and repay
            principal although it is somewhat more susceptible to the adverse
            effects of changes in circumstances and economic conditions than
            debt in higher rated categories.
               BBB: Debt rated BBB is regarded as having an adequate capacity
            to pay interest and repay principal. Whereas it normally exhibits
            adequate protection parameters, adverse economic conditions, or
            changing circumstances are more likely to lead to a weakened ca-
            pacity to pay interest and repay principal for debt in this cate-
            gory than in higher-rated categories.
 
            SPECULATIVE GRADE
            Debt rated BB, B, CCC, CC, and C is regarded as having predomi-
            nantly speculative characteristics with respect to capacity to pay
            interest and repay principal. BB indicates the least degree of
            speculation and C the highest. While such debt will likely have
            some quality and protective characteristics, these are outweighed
            by large uncertainties or major exposures to adverse conditions.
               BB: Debt rated BB has less near-term vulnerability to default
            than other speculative issues. However, it faces major ongoing un-
            certainties or exposure to adverse business, financial, or eco-
            nomic conditions which could lead to inadequate capacity to meet
            timely interest and principal payments. The BB rating category is
            also used for debt subordinated to senior debt that is assigned an
            actual or implied BBB- rating.
                                                     August 1, 1998 Prospectus
                                                                              67
<PAGE>
 
               B: Debt rated B has a greater vulnerability to default but cur-
            rently has the capacity to meet interest payments and principal
            repayments. Adverse business, financial, or economic conditions
            will likely impair capacity or willingness to pay interest and re-
            pay principal. The B rating category is also used for debt subor-
            dinated to senior debt that is assigned an actual or implied BB or
            BB- rating.
               CCC: Debt rated CCC has a currently identifiable vulnerability
            to default and is dependent upon favorable business, financial,
            and economic conditions to meet timely payment of interest and re-
            payment of principal. In the event of adverse business, financial
            or economic conditions, it is not likely to have the capacity to
            pay interest and repay principal. The CCC rating category is also
            used for debt subordinated to senior debt that is assigned an ac-
            tual or implied B or B- rating.
               CC: The rating CC is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC rating.
               C: The rating C is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC- debt rat-
            ing. The C rating may be used to cover a situation where a bank-
            ruptcy petition has been filed, but debt service payments are con-
            tinued.
               CI: The rating CI is reserved for income bonds on which no in-
            terest is being paid.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period. The D rating will also be used upon the filing of a
            bankruptcy petition if debt service payments are jeopardized.
               Plus (+) or Minus (-): The ratings from AA to CCC may be modi-
            fied by the addition of a plus or minus sign to show relative
            standing within the major rating categories.
               Provisional ratings: The letter "p" indicates that the rating
            is provisional. A provisional rating assumes the successful com-
            pletion of the project being financed by the debt being rated and
            indicates that payment of debt service requirements is largely or
            entirely dependent upon the successful and timely completion of
            the project. This rating, however, while addressing credit quality
            subsequent to completion of the project, makes no comment on the
            likelihood of, or the risk of default upon failure of, such com-
            pletion. The investor should exercise his own judgment with re-
            spect to such likelihood and risk.
               r: The "r" is attached to highlight derivative, hybrid, and
            certain other obligations that S&P believes may experience high
            volatility or high variability in expected returns due to non-
            credit risks. Examples of such obligations are: securities whose
            principal or interest return is indexed to equities, commodities,
            or currencies; certain swaps and options; and interest only and
            principal only mortgage securities.
               The absence of an "r" symbol should not be taken as an indica-
            tion that an obligation will exhibit no volatility or variability
            in total return.
               N.R.: Not rated.
               Debt obligations of issuers outside the United States and its
            territories are rated on the same basis as domestic corporate and
            municipal issues. The ratings measure the creditworthiness of the
            obligor but do not take into account currency exchange and related
            uncertainties.
 
            COMMERCIAL PAPER RATING DEFINITIONS
            An S&P commercial paper rating is a current assessment of the
            likelihood of timely payment of debt having an original maturity
            of no more than 365 days. Ratings are graded into several catego-
            ries, ranging from A for the highest quality obligations to D for
            the lowest. These categories are as follows:
               A-1: This highest category indicates that the degree of safety
            regarding timely payment is strong. Those issues determined to
            possess extremely strong safety characteristics are denoted with a
            plus sign (+) designation.
               A-2: Capacity for timely payment on issues with this designa-
            tion is satisfactory. However, the relative degree of safety is
            not as high as for issues designated A-1.
 
68
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               A-3: Issues carrying this designation have adequate capacity
            for timely payment. They are, however, more vulnerable to the ad-
            verse effects of changes in circumstances than obligations carry-
            ing the higher designations.
               B: Issues rated B are regarded as having only speculative ca-
            pacity for timely payment.
               C: This rating is assigned to short-term debt obligations with
            a doubtful capacity for payment.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due, even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period.
               A commercial paper rating is not a recommendation to purchase,
            sell or hold a security inasmuch as it does not comment as to mar-
            ket price or suitability for a particular investor. The ratings
            are based on current information furnished to S&P by the issuer or
            obtained from other sources it considers reliable. S&P does not
            perform an audit in connection with any rating and may, on occa-
            sion, rely on unaudited financial information. The ratings may be
            changed, suspended, or withdrawn as a result of changes in or un-
            availability of such information.
                   
                                                     August 1, 1998 Prospectus
                                                                              69
<PAGE>
 
               -----------------------------------------------------------------
PIMCO FUNDS:   INVESTMENT ADVISER AND AMINISTRATOR
PACIFIC        Pacific Investment Management Company, 840 Newport Center
INVESTMENT     Drive, Suite 300,
MANAGEMENT     Newport Beach, CA 92660
SERIES         
               -----------------------------------------------------------------
               DISTRIBUTOR
               PIMCO Funds Distributors LLC, 2187 Atlantic Street, Stamford,
               CT 06902

               -----------------------------------------------------------------
               CUSTODIAN
               Investors Fiduciary Trust Company, 801 Pennsylvania, Kansas
               City, MO 64105

               -----------------------------------------------------------------
               SHAREHOLDER SERVICING AGENT AND TRANSFER AGENT
               Shareholder Services, Inc. P.O. Box 5866, Denver, CO 80217

               -----------------------------------------------------------------
               INDEPENDENT ACCOUNTANTS
               PricewaterhouseCoopers LLP, 1055 Broadway, Kansas City, MO 64105

               -----------------------------------------------------------------
               LEGAL COUNSEL
               Dechert Price & Rhoads, 1775 Eye Street N.W. Washington, D.C.
               20006-2401

               -----------------------------------------------------------------
               For further information about the PIMCO Funds, call
               1-800-426-0107 or visit our Web site at www.pimcofunds.com.
<PAGE>

                    PIMCO Funds Prospectus


Pacific             SHORT-TERM BOND FUNDS
Investment          Short-Term Fund
Management          Low Duration Fund
Series: Class  
D Shares 
                    INTERMEDIATE-TERM BOND FUNDS
August 1, 1998      Real Return Bond Fund
                    Total Return Fund
                    Total Return Mortgage Fund
                    High Yield Fund

                    LONG-TERM BOND FUNDS
                    Municipal Bond Fund

                    INTERNATIONAL BOND FUNDS
                    Foreign Bond Fund

                    STOCK AND BOND FUNDS
                    Strategic Balanced Fund

                    STOCK FUNDS
                    StocksPLUS Fund

                                              [LOGO OF PIMCO FUNDS APPEARS HERE]
<PAGE>
 
            PIMCO Funds: Pacific Investment Management Series
            Prospectus
               
            August 1, 1998     
               
            PIMCO Funds: Pacific Investment Management Series (the "Trust") is
            an open-end series management investment company offering ten sep-
            arate investment portfolios (each a "Fund") in this prospectus.
            The Trust is designed to provide access to the professional in-
            vestment management services offered by Pacific Investment Manage-
            ment Company ("Pacific Investment Management"), which serves as
            investment adviser (the "Adviser") to the Funds. The address of
            PIMCO Funds is 840 Newport Center Drive, Suite 300, Newport Beach,
            CA 92660.     
 
            Each Fund offers Class D shares in this Prospectus. Through sepa-
            rate prospectuses, certain Funds and other series of the Trust of-
            fer up to five additional classes of shares, Institutional Class,
            Administrative Class, Class A, Class B and Class C shares. See
            "Description of the Trust--Multiple Classes of Shares."
 
            This Prospectus concisely describes the information investors
            should know before investing in Class D shares of the Funds.
            Please read this Prospectus carefully and keep it for further ref-
            erence. Information about the investment objective of each Fund,
            along with a detailed description of the types of securities in
            which each Fund may invest and of investment policies and restric-
            tions applicable to each Fund, are set forth in this Prospectus.
            There can be no assurance that the investment objective of any
            Fund will be achieved. Because the market value of each Fund's in-
            vestments will change, the investment returns and net asset value
            per share of each Fund will vary.
 
            Class D shares are offered only through financial service firms,
            such as broker-dealers or registered investment advisers, with
            which the Funds' distributor has an agreement for the use of the
            Funds in particular investment products, programs or accounts for
            which a fee may be charged. See "How to Buy Shares." If you wish
            to purchase shares directly from the Trust or the Funds' distribu-
            tor, please consider one of the other classes of shares. See "De-
            scription of the Trust--Multiple Classes of Shares."
               
            A Statement of Additional Information, dated August 1, 1998, as
            amended or supplemented from time to time, is available free of
            charge by writing to PIMCO Funds Distributors LLC (the "Distribu-
            tor"), 2187 Atlantic Street, Stamford, Connecticut 06902, or by
            telephoning 888-87-PIMCO. The Statement of Additional Information,
            which contains more detailed information about the Trust, has been
            filed with the Securities and Exchange Commission and is incorpo-
            rated by reference into this Prospectus. The Securities and Ex-
            change Commission maintains an Internet World Wide Web site (at
            www.sec.gov) which contains the Statement of Additional Informa-
            tion, materials that are incorporated by reference into this Pro-
            spectus and the Statement of Additional Information, and other in-
            formation about the Funds.     
 
            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SE-
            CURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMIS-
            SION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
            SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
            PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OF-
            FENSE.
 
            SHARES OF THE FUNDS ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARAN-
            TEED OR ENDORSED BY, ANY FINANCIAL INSTITUTION, AND THE SHARES ARE
            NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORA-
            TION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND ENTAIL
            RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
            EACH OF THE FUNDS, EXCEPT THE MUNICIPAL BOND FUND, MAY INVEST ALL
            OF ITS ASSETS IN DERIVATIVE INSTRUMENTS, SOME OF WHICH MAY BE PAR-
            TICULARLY SENSITIVE TO CHANGES IN PREVAILING INTEREST RATES. UNEX-
            PECTED CHANGES IN INTEREST RATES MAY ADVERSELY AFFECT THE VALUE OF
            A FUND'S INVESTMENTS IN PARTICULAR DERIVATIVE INSTRUMENTS.
 
            THE HIGH YIELD FUND MAY INVEST ALL OF ITS ASSETS IN JUNK BONDS,
            WHICH ARE SUBJECT TO HIGH RISK, AND SPECULATIVE WITH REGARD TO
            PAYMENT OF INTEREST AND RETURN OF PRINCIPAL. INVESTORS SHOULD
            CAREFULLY CONSIDER THESE RISKS BEFORE INVESTING IN THE HIGH YIELD
            FUND. SEE "CHARACTERISTICS AND RISKS OF SECURITIES AND INVESTMENT
            TECHNIQUES--HIGH YIELD SECURITIES ("JUNK BONDS")."
 
 
              TABLE OF CONTENTS
 
<TABLE>   
           <S>                                <C>
           Distributor.......................  30
           How Net Asset Value Is Determined
           ..................................  30
           Distributions.....................  30
           Taxes.............................  31
           Management of the Trust...........  33
           Description of the Trust..........  35
           Appendix A--Description of
           Duration..........................  37
           Appendix B--Description of
           Securities Ratings................  38
           PIMCO Funds Overview..............   3
           Schedule of Fees..................   4
           Investment Objectives and
           Policies..........................   5
           Investment Risks and
           Considerations....................  10
           Characteristics and Risks of
            Securities
            and Investment Techniques........  11
           Performance Information...........  26
           How to Buy Shares.................  28
           Exchange Privilege................  29
           How to Redeem.....................  29
</TABLE>    
 PIMCO Funds: Pacific Investment Management Series
2
<PAGE>
 
            PIMCO Funds Overview
               
            Pacific Investment Management, a subsidiary of PIMCO Advisors
            L.P., is the investment adviser of all of the Funds. Pacific In-
            vestment Management is one of the premier fixed income investment
            management firms in the U.S. As of June 30, 1998, Pacific Invest-
            ment Management had over $138 billion in assets under management.
            Pacific Investment Management invests in all sectors of the fixed
            income market, using its total return philosophy--seeking capital
            appreciation as well as yield.     

FUND
PROFILES
 
<TABLE>   
<CAPTION>
                            PIMCO                 PRIMARY
                            FUND NAME             OBJECTIVE                              DURATION        CREDIT QUALITY(/1/)
              ---------------------------------------------------------------------------------------------------------
           <S>              <C>                   <C>                                    <C>             <C>
           SHORT-TERM BOND
            FUNDS           Short-Term            Maximum current income, consistent     0-1 year        B to Aaa; max
                                                  with preservation of capital and                       10% below Baa
                                                  daily liquidity
                             ---------------------------------------------------------------------------------
                            Low Duration          Maximum total return, consistent       1-3 years       B to Aaa; max
                                                  with preservation of capital                           10% below Baa
                                                  and prudent investment management
              ---------------------------------------------------------------------------------------------------------
           INTERMEDIATE-
            TERM            Real Return Bond      Maximum real return, consistent        Not applicable, B to Aaa; max
            BOND FUNDS                            with preservation of real capital      but see Fund    10% below Baa
                                                  and prudent investment management      description
                             ---------------------------------------------------------------------------------
                            Total Return          Maximum total return, consistent       3-6 years       B to Aaa; max
                                                  with preservation of capital                           10% below Baa
                                                  and prudent investment management
                             ---------------------------------------------------------------------------------
                            Total Return Mortgage Maximum total return, consistent       2-6 years       Baa to Aaa; max
                                                  with preservation of capital                           10% below Aaa
                                                  and prudent investment management
                             ---------------------------------------------------------------------------------
                            High Yield            Maximum total return, consistent       2-6 years       B to Aaa; min
                                                  with preservation of capital                           65% below Baa
                                                  and prudent investment management
              ---------------------------------------------------------------------------------------------------------
           LONG-TERM BOND
            FUNDS           Municipal Bond        High current income exempt from        3-10 years      Ba to Aaa; max
                                                  federal income tax, consistent with                    10% below Baa
                                                  preservation of capital
              ---------------------------------------------------------------------------------------------------------
           INTERNATIONAL    Foreign Bond          Maximum total return, consistent       3-6 years       B to Aaa; max
           BOND FUNDS                             with preservation of capital                           10% below Baa
                                                  and prudent investment management
                                                  (non-U.S.)
              ---------------------------------------------------------------------------------------------------------
           STOCK AND BOND
            FUNDS           Strategic Balanced    Maximum total return, consistent       0-6 years       B to Aaa; max
                                                  with preservation of capital                           10% below Baa
              ---------------------------------------------------------------------------------------------------------
           STOCK FUNDS      StocksPLUS(/2/)       Total return which exceeds that of the 0-1 year        B to Aaa; max
                                                  S&P 500                                                10% below Baa
</TABLE>    
 
 
            1. As rated by Moody's Investors Service, Inc., or if unrated, de-
            termined to be of comparable quality. For specific information
            concerning the credit quality of the securities in each Fund's
            portfolio, see "Investment Objectives and Policies."
            2. The StocksPLUS Fund may invest all of its assets in stock index
            futures backed by short-term bonds.
                                                     August 1, 1998 Prospectus
                                                                               3
<PAGE>
 
            Schedule of Fees

SHAREHOLDER
TRANSACTION
EXPENSES
 
<TABLE>
<CAPTION>
           ALL FUNDS-CLASS D SHARES
              ------------------------------------------------------------
           <S>                                                        <C>
           MAXIMUM INITIAL SALES CHARGE IMPOSED ON PURCHASES
            (as a percentage of offering price at time of purchase)   None
              ------------------------------------------------------------
           MAXIMUM SALES CHARGE IMPOSED ON REINVESTED DIVIDENDS
            (as a percentage of net asset value at time of purchase)  None
              ------------------------------------------------------------
           MAXIMUM DEFERRED SALES CHARGE
            (as a percentage of original purchase price)              None
              ------------------------------------------------------------
           EXCHANGE FEE                                               None
</TABLE>
 
 
<TABLE>
<CAPTION>
                                                                            EXAMPLE: You
                                                                            would
                                                                            pay
                                                                            the
                                                                            following
                                                                            expenses
                                                                            on a
                                                                            $1,000
                                                                            investment
                                                                            assuming
                                                                            (1) 5%
                                                                            annual
                                                                            return
                                                                            and
                                                                            (2) redemption
                                                                            at the
                                                                            end of
                                                                            each
                                  ANNUAL FUND OPERATING EXPENSES            time
                                  (As a percentage of average net assets):  period:
                                                                 TOTAL
                                            ADMINIS-  12B-1      FUND
                                  ADVISORY  TRATIVE   (SERVICE)  OPERATING  YEAR
           FUND                   FEE       FEE(1)    FEE(1)     EXPENSES   1      3     5     10
              -------------------------------------------------------------------------------------
           <S>                    <C>       <C>       <C>        <C>        <C>    <C>   <C>   <C>
           SHORT-TERM             .25%      .25%      .25%        .75%        $ 8  $24   $42   $ 93
              -------------------------------------------------------------------------------------
           LOW DURATION           .25       .25       .25         .75           8   24    42     93
              -------------------------------------------------------------------------------------
           REAL RETURN BOND       .25       .40       .25         .90           9   29    50    111
              -------------------------------------------------------------------------------------
           TOTAL RETURN           .25       .25       .25         .75           8   24    42     93
              -------------------------------------------------------------------------------------
           TOTAL RETURN MORTGAGE  .25       .40       .25         .90           9   29    50    111
              -------------------------------------------------------------------------------------
           HIGH YIELD             .25       .40       .25         .90           9   29    50    111
              -------------------------------------------------------------------------------------
           MUNICIPAL BOND         .25       .35       .25         .85           9   27    47    105
              -------------------------------------------------------------------------------------
           FOREIGN BOND           .25       .45       .25         .95          10   30    53    117
              -------------------------------------------------------------------------------------
           STRATEGIC BALANCED     .40       .40       .25        1.05          11   33    58    128
              -------------------------------------------------------------------------------------
           STOCKSPLUS             .40       .40       .25        1.05          11   33    58    128
              -------------------------------------------------------------------------------------
</TABLE>
 
 
 
            1. The Funds' administration agreement includes a plan for Class D
            shares that has been adopted in conformity with the requirements
            set forth in Rule 12b-1 of the Investment Company Act of 1940. The
            plan provides that up to .25% per annum of the total fees paid un-
            der the administration agreement may represent reimbursement for
            expenses in respect of activities ("subject activities") that may
            be deemed to be primarily intended to result in the sale of Class
            D shares. The Short-Term, Low Duration and Total Return Funds will
            pay a total of .50% per annum, the Municipal Bond Fund will pay a
            total of .60% per annum, the Foreign Bond Fund will pay a total of
            .70% per annum, and each remaining Fund will pay a total of .65%
            per annum, under the administration agreement regardless of
            whether a portion or none of the .25% authorized under the plan is
            paid for subject services. To the extent that any payments are
            deemed to be made pursuant to the plan, the Funds intend to treat
            such payments as "service fees" for purposes of applicable rules
            of the National Association of Securities Dealers, Inc. (the
            "NASD"). See "Management of the Trust--Fund Administrator." To the
            extent that such payments for subject activities are deemed not to
            be "service fees," Class D shareholders may, depending on the
            length of time the shares are held, pay more than the economic
            equivalent of the maximum front-end sales charges permitted by
            relevant rules of the NASD.
            The purpose of the foregoing tables is to assist investors in un-
            derstanding the various costs and expenses of the Trust that are
            borne directly or indirectly by Class D shareholders of the Funds.
            The information is based upon each Fund's current fees and ex-
            penses.
 
            NOTE: THE FIGURES SHOWN IN THE EXAMPLE ARE ENTIRELY HYPOTHETICAL.
            THEY ARE NOT REPRESENTATIONS OF PAST OR FUTURE PERFORMANCE OR EX-
            PENSES; ACTUAL PERFORMANCE AND/OR EXPENSES MAY BE MORE OR LESS
            THAN SHOWN.
 
 PIMCO Funds: Pacific Investment Management Series
4
<PAGE>
 
            Investment Objectives and Policies
               
            The investment objective and general investment policies of each
            Fund are described below. There can be no assurance that the in-
            vestment objective of any Fund will be achieved. For temporary,
            defensive or emergency purposes, a Fund may invest without limit
            in U.S. debt securities, including short-term money market securi-
            ties, when in the opinion of the Adviser it is appropriate to do
            so. It is impossible to predict for how long such alternative
            strategies will be utilized. The value of all securities and other
            instruments held by the Funds will vary from time to time in re-
            sponse to a wide variety of market factors. Consequently, the net
            asset value per share of each Fund will vary.     
               The investment objective of each Fund is fundamental and may
            not be changed without shareholder approval by vote of a majority
            of the outstanding shares of that Fund. If there is a change in a
            Fund's investment objective, including a change approved by a
            shareholder vote, shareholders should consider whether the Fund
            remains an appropriate investment in light of their then current
            financial position and needs.
               Specific portfolio securities eligible for purchase by the
            Funds, investment techniques that may be used by the Funds, and
            the risks associated with these securities and techniques are de-
            scribed more fully under "Characteristics and Risks of Securities
            and Investment Techniques" in this Prospectus and "Investment Ob-
            jectives and Policies" in the Statement of Additional Information.
 
 
FIXED       With the exception of the Strategic Balanced and StocksPLUS Funds,
INCOME FUND each remaining Fund (together, the "Fixed Income Funds") differs
DESCRIPTIONSfrom the others primarily in the length of the Fund's duration or
            the proportion of its investments in certain types of fixed income
            securities. For a discussion of the concept of duration, see "Ap-
            pendix A--Description of Duration."
               The investment objective of the Short-Term Fund is to seek to
            obtain maximum current income consistent with preservation of cap-
            ital and daily liquidity. The investment objective of the Real Re-
            turn Bond Fund is to seek to realize maximum real return, consis-
            tent with the preservation of real capital and prudent investment
            management. For a discussion of "real return," see "Total Return
            and Real Return," below. The investment objective of the Municipal
            Bond Fund is to seek high current income exempt from federal in-
            come tax, consistent with preservation of capital. Capital appre-
            ciation is a secondary objective of the Municipal Bond Fund. Each
            of the remaining Fixed Income Funds and the Strategic Balanced
            Fund seek to maximize total return, consistent with preservation
            of capital and prudent investment management.
               
               In selecting securities for each Fixed Income Fund, the Adviser
            utilizes economic forecasting, interest rate anticipation, credit
            and call risk analysis, foreign currency exchange rate forecast-
            ing, and other security selection techniques. The proportion of
            each Fund's assets committed to investment in securities with par-
            ticular characteristics (such as maturity, type and coupon rate)
            will vary based on the Adviser's outlook for the U.S. and foreign
            economies, the financial markets, and other factors.     
               
               Each of the Fixed Income Funds will invest at least 65% of its
            assets in the following types of securities, which, unless specif-
            ically provided otherwise in the descriptions of the Funds that
            follow, may be issued by domestic or foreign entities and denomi-
            nated in U.S. dollars or foreign currencies: securities issued or
            guaranteed by the U.S. Government, its agencies or instrumentali-
            ties ("U.S. Government securities"); corporate debt securities,
            including convertible securities and corporate commercial paper;
            mortgage-backed and other asset-backed securities; inflation-in-
            dexed bonds issued by both governments and corporations; struc-
            tured notes, including hybrid or "indexed" securities, catastrophe
            bonds, and loan participations; delayed funding loans and revolv-
            ing credit facilities; bank certificates of deposit, fixed time
            deposits and bankers' acceptances; repurchase agreements and re-
            verse repurchase agreements; debt securities issued by states or
            local governments and their agencies, authorities and other in-
            strumentalities; obligations of foreign governments or their sub-
            divisions, agencies and instrumentalities; and obligations of in-
            ternational agencies or supranational entities. Fixed income secu-
            rities may have fixed, variable, or floating rates of interest,
            including rates of interest that vary inversely at a multiple of a
            designated or floating rate, or that vary according to changes in
            relative values of currencies. Each of the Fixed Income Funds may
            hold different percentages of its assets in these various types of
            securities, and each Fund may invest all of its assets in deriva-
            tive instruments or in mortgage- or asset-backed securities.     
                                                   August 1, 1998 Prospectus 5
<PAGE>
 
            Each of the Fixed Income Funds may adhere to its investment policy
            by entering into a series of purchase and sale contracts or util-
            izing other investment techniques by which it may obtain market
            exposure to the securities in which it primarily invests.
               In addition, each of the Fixed Income Funds may lend its port-
            folio securities to brokers, dealers and other financial institu-
            tions in order to earn income. Each of the Fixed Income Funds may
            purchase and sell options and futures subject to the limits dis-
            cussed below, engage in credit spread trades and enter into for-
            ward foreign currency contracts.
               The Real Return Bond and Foreign Bond Funds will normally in-
            vest at least 80% of its total assets in "bonds." For this pur-
            pose, each of these Funds considers the various types of debt or
            fixed income securities in which it invests, as specifically de-
            scribed elsewhere in this Prospectus, to be "bonds" as referenced
            in that Fund's name. The use of this name is not meant to restrict
            a Fund's investment to the narrow category of debt securities that
            are formally called "bonds."
               
               As a non-fundamental, operating policy, the Adviser intends to
            use foreign currency-related derivative instruments (currency
            futures and related options, currency options, forward contracts
            and swap agreements) in an effort to hedge foreign currency risk
            with respect to at least 75% of the assets of the Fixed Income
            Funds denominated in currencies other than the U.S. dollar. There
            can be no assurance that the Adviser will be successful in doing
            so. The active use of currency derivatives involves transaction
            costs which may adversely effect yield and return.     
 
            The compositions of the Fixed Income Funds differ as follows:
               
            SHORT-TERM FUND invests in a diversified portfolio of fixed income
            securities of varying maturities. The average portfolio duration
            of this Fund will normally not exceed one year. The Fund may in-
            vest up to 10% of its assets in fixed income securities that are
            rated below investment grade (rated below Baa by Moody's Investors
            Service, Inc. ("Moody's") or BBB by Standard & Poor's Ratings
            Services ("S&P")) but rated B or higher by Moody's or S&P (or, if
            unrated, determined by the Adviser to be of comparable quality).
            For information on the risks associated with investments in secu-
            rities rated below investment grade, see "Appendix B--Description
            of Securities Ratings." The Fund may invest up to 5% of its assets
            in securities denominated in foreign currencies, and may invest
            beyond this limit in U.S. dollar-denominated securities of foreign
            issuers.     
               
            LOW DURATION FUND invests in a diversified portfolio of fixed in-
            come securities of varying maturities. The average portfolio dura-
            tion of this Fund will normally vary within a one- to three-year
            time frame based on the Adviser's forecast for interest rates. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Adviser to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings." The Fund may invest
            up to 20% of its assets in securities denominated in foreign cur-
            rencies, and may invest beyond this limit in U.S. dollar-denomi-
            nated securities of foreign issuers.     
            The total rate of return for this Fund is expected to exhibit less
            volatility than that of the Total Return Fund because its duration
            will be shorter.
               
            REAL RETURN BOND FUND invests under normal circumstances at least
            65% of its total assets in inflation-indexed bonds issued by U.S.
            and foreign governments, their agencies or instrumentalities. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Adviser to be of
            comparable quality).The Fund may invest up to 35% of its assets in
            other types of fixed income instruments, including securities de-
            nominated in foreign currencies (and the Fund may also invest be-
            yond this limit in U.S. dollar-denominated securities of foreign
            issuers).     
               Inflation-indexed bonds are fixed income securities whose prin-
            cipal value is periodically adjusted according to the rate of in-
            flation. Such bonds generally are issued at an interest rate lower
            than non-inflation related bonds, but are
 PIMCO Funds: Pacific Investment Management Series
6
<PAGE>
 
            expected to retain their value against inflation over time. For a
            more complete discussion of inflation-indexed bonds, including the
            risks associated with investing in such securities, see "Charac-
            teristics and Risks of Securities and Investment Techniques--In-
            flation-Indexed Bonds." See "Taxes" for information about the pos-
            sible tax consequences of investing in the Fund and in inflation-
            indexed bonds.
               
               In managing fixed income securities, one of the principal tools
            generally used by the Adviser is "duration," which is a measure of
            the expected life of a fixed income security on a present value
            basis, incorporating a bond's yield, coupon interest payments, fi-
            nal maturity and call features. See "Appendix A--Description of
            Duration." Because of the unique features of inflation-indexed
            bonds, the Adviser utilizes a modified form of duration for the
            Real Return Bond Fund ("modified real duration") which measures
            price changes in such bonds as a result of changes in real, rather
            than nominal, interest rates. Although there is no limit on the
            modified real duration of the Real Return Bond Fund, it is ex-
            pected that the average modified real duration of the Fund will
            normally vary approximately within the range of the average modi-
            fied real duration of all inflation-indexed bonds issued by the
            U.S. Treasury in the aggregate.     
               
            TOTAL RETURN FUND invests under normal circumstances at least 65%
            of its assets in a diversified portfolio of fixed income securi-
            ties of varying maturities. The average portfolio duration of this
            Fund will normally vary within a three- to six-year time frame
            based on the Adviser's forecast for interest rates. The Fund may
            invest up to 10% of its assets in fixed income securities that are
            rated below investment grade but rated B or higher by Moody's or
            S&P (or, if unrated, determined by the Adviser to be of comparable
            quality). For information on the risks associated with investments
            in securities rated below investment grade, see "Appendix B--De-
            scription of Securities Ratings." The Fund may also invest up to
            20% of its assets in securities denominated in foreign currencies,
            and may invest beyond this limit in U.S. dollar-denominated secu-
            rities of foreign issuers. Portfolio holdings will be concentrated
            in areas of the bond market (based on quality, sector, coupon or
            maturity) which the Adviser believes to be relatively undervalued.
            The total rate of return for this Fund is expected to exhibit less
            volatility than that of the Long-Term U.S. Government Fund because
            its duration will normally be shorter.     
               
            TOTAL RETURN MORTGAGE FUND invests under normal circumstances at
            least 80% of its assets in a diversified portfolio of mortgage-re-
            lated securities. The Fund will not acquire a security if, as a
            result, more than 10% of the Fund's total assets would be invested
            in securities rated below Aaa by Moody's of AAA by S&P, subject to
            a minimum rating of Baa by Moody's or BBB by S&P (or, if unrated,
            determined by the Adviser to be of comparable quality). The aver-
            age portfolio duration of this Fund will normally vary within a
            two- to six-year time frame based on the Adviser's view of the po-
            tential for total return offered by a particular duration strate-
            gy.     
               
            HIGH YIELD FUND invests under normal circumstances at least 65% of
            its assets in a diversified portfolio of fixed income securities
            rated lower than Baa by Moody's or lower than BBB by S&P but rated
            at least B by Moody's or S&P (or, if unrated, determined by the
            Adviser to be of comparable quality). The remainder of the Fund's
            assets may be invested in investment grade fixed income securities
            (i.e., securities rated at least Baa by Moody's or BBB by S&P, or,
            if unrated, deemed by the Adviser to be of comparable quality).
            The average portfolio duration of this Fund will normally vary
            within a two- to six-year time frame depending on the Adviser's
            view of the potential for total return offered by a particular du-
            ration strategy. The Fund may invest in securities of foreign is-
            suers, but only those that are U.S. dollar-denominated. The Fund
            may also engage in hedging strategies involving equity options.
                   
               Investments in high yield securities, while generally providing
            greater potential opportunity for capital appreciation and higher
            yields than investments in higher rated securities, also entail
            greater risk, including the possibility of default or bankruptcy
            of the issuer of such securities. Risk of default or bankruptcy
            may be greater in periods of economic uncertainty or recession, as
            the issuers of high yield securities may be less able to withstand
            general economic downturns. The Adviser seeks to reduce risk
            through diversification, credit analysis and attention to current
            developments and trends in both the economy and financial markets.
            The value of all fixed income securities, including those held by
            the Fund, can be expected to change inversely with interest rates.
            Securities rated below investment grade may     
                                                     August 1, 1998 Prospectus
                                                                               7
<PAGE>
 
               
            sometimes be referred to as "junk bonds." For a further discussion
            of the special risks of investing in lower-rated securities, see
            "Characteristics and Risks of Securities and Investment Tech-
            niques--High Yield Securities ("Junk Bonds")."     
               
            MUNICIPAL BOND FUND seeks high current income exempt from federal
            income tax, consistent with preservation of capital. Capital ap-
            preciation is a secondary objective. The Fund seeks its objectives
            by investing in debt securities whose interest is, in the opinion
            of bond counsel for the issuer at the time of issuance, exempt
            from federal income tax ("Municipal Bonds"). Municipal Bonds gen-
            erally are issued by states and local governments and their agen-
            cies, authorities and other instrumentalities. It is a policy of
            the Fund that, under normal market conditions, at least 80% of its
            net assets will be invested in Municipal Bonds. The Fund may in-
            vest up to 20% of its net assets in U.S. Government securities,
            money market instruments and/or "private activity" bonds. Under
            normal circumstances, the average portfolio duration of the Munic-
            ipal Bond Fund will vary within a three- to ten-year time frame,
            based on the Adviser's forecast for interest rates.     
               
               The Fund may invest up to 10% of its net assets in Municipal
            Bonds or "private activity" bonds which are rated below Baa by
            Moody's or BBB by S&P but which are rated at least Ba by Moody's
            or BB by S&P (or, if unrated, determined by the Adviser to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings."     
               
            FOREIGN BOND FUND invests in a portfolio of fixed income securi-
            ties primarily denominated in major foreign currencies and baskets
            of foreign currencies (such as the European Currency Unit, or
            "ECU"). The Adviser will invest the assets of the Fund in a number
            of international bond markets so that, under normal circumstances,
            the Fund will invest at least 85% of its assets in securities of
            issuers located outside the United States, representing at least
            three foreign countries, which may be represented by futures con-
            tracts (including related options) with respect to such securi-
            ties, and options on such securities, when the Adviser deems it
            appropriate to do so. The Fund may invest up to 10% of its assets
            in fixed income securities that are rated below investment grade
            but rated B or higher by Moody's or S&P (or, if unrated, deter-
            mined by the Adviser to be of comparable quality). Securities
            rated below investment grade may sometimes be referred to as "junk
            bonds." For information on the risks associated with investments
            in securities rated below investment grade, see "Appendix B--De-
            scription of Securities Ratings." The average portfolio duration
            of this Fund will normally vary within a three- to six-year time
            frame.     
 
 
STOCK AND      
BOND FUND   STRATEGIC BALANCED FUND has as its investment objective the maxi-
DESCRIPTION mization of total return, consistent with preservation of capital
            and prudent investment management. In seeking to achieve this ob-
            jective, the Fund invests in the securities eligible for purchase
            by the StocksPLUS Fund and the Total Return Fund. The percentage
            of the Fund's assets allocated to equity or fixed income exposure
            will vary in accordance with an asset allocation methodology de-
            veloped by the Adviser. The methodology builds upon the Adviser's
            long-standing process of economic forecasting of business cycle
            stages by applying to this process a disciplined asset allocation
            model which employs certain statistical variance techniques. De-
            pending on the outcome of this asset allocation methodology, the
            Fund's equity exposure will vary between 45% and 75% of its total
            assets, and its fixed income exposure will vary between 25% and
            55%. There can be no assurance that the Adviser's asset allocation
            methodology will be successful.     
 
 
STOCK FUND
DESCRIPTION    
            STOCKSPLUS FUND, as its investment objective, seeks to achieve to-
            tal return which exceeds the total return performance of the Stan-
            dard & Poor's 500 Composite Stock Price Index ("S&P 500").
            StocksPLUS is the name of a proprietary portfolio management
            strategy which utilizes S&P 500 derivatives in addition to or in
            place of S&P 500 stocks to equal or exceed the performance of the
            S&P 500. The Adviser expects that under normal market conditions,
            the Fund will invest substantially all of its assets in S&P 500
            derivatives, backed by a portfolio of fixed income securities. The
            Adviser will actively manage the fixed income assets serving as
            cover for derivatives, as well as any other fixed income assets
                
 PIMCO Funds: Pacific Investment Management Series
8
<PAGE>
 
            held by the Fund, with a view toward enhancing the Fund's total
            return investment performance, subject to an overall portfolio du-
            ration which is normally not expected to exceed one year. See "Ap-
            pendix A--Description of Duration."
               The S&P 500 is composed of 500 selected common stocks, most of
            which are listed on the New York Stock Exchange. S&P chooses the
            stocks to be included in the S&P 500 solely on a statistical ba-
            sis. The weightings of stocks in the index are based on each
            stock's relative total market value, that is, its market price per
            share times the number of shares outstanding. Stocks represented
            currently in the S&P 500 represent approximately two-thirds of the
            total market value of all U.S. common stocks. The Fund is neither
            sponsored by nor affiliated with S&P. The Fund will seek to remain
            invested in S&P 500 derivatives or S&P 500 stocks even when the
            S&P 500 is declining.
               
               When S&P 500 derivatives appear to be overvalued relative to
            the S&P 500, the Fund may invest up to 100% of its assets in a
            "basket" of S&P 500 stocks. The composition of this basket will be
            determined by standard statistical techniques that analyze the
            historical correlation between the return of every stock currently
            in the S&P 500 and the return on the S&P 500 itself. The Adviser
            may employ fundamental stock analysis only to choose among stocks
            that have already satisfied the statistical correlation tests.
            Stocks chosen for the Fund are not limited to those with any par-
            ticular weighting in the S&P 500.     
               
               Positions in S&P 500 futures and options on futures will be en-
            tered into only to the extent they constitute permissible posi-
            tions for the Fund according to applicable rules of the Commodity
            Futures Trading Commission ("CFTC"). From time to time, the Ad-
            viser may be constrained in its ability to use S&P 500 derivatives
            either by requirements of the Internal Revenue Code or by an unan-
            ticipated inability to close out positions when it would be most
            advantageous to do so. A large number of investors use S&P 500 de-
            rivatives for both hedging and speculative purposes, and although
            generally this helps guarantee a liquid market in those instru-
            ments, at times liquidity may be     
            limited. For more information about S&P 500 derivatives, see
            "Characteristics and Risks of Securities and Investment Tech-
            niques--Derivative Instruments."
               
               Assets of the StocksPLUS Fund not invested in equity securities
            may be invested in securities eligible for purchase by the Fixed
            Income Funds. The Fund may invest up to 10% of its assets in fixed
            income securities that are below "investment grade," i.e., rated
            below Baa by Moody's or BBB by S&P, but at least B (or, if
            unrated, determined by the Adviser to be of comparable quality).
            In addition, the StocksPLUS Fund may lend its portfolio securities
            to brokers, dealers and other financial institutions in order to
            earn income. The Fund may also invest all of its assets in deriva-
            tive instruments, as described under "Characteristics of Securi-
            ties and Investment Techniques--Derivative Instruments." In addi-
            tion, the Fund may invest up to 20% of its assets in securities of
            foreign issuers, may purchase and sell options and futures on for-
            eign currencies, and may enter into forward foreign currency con-
            tracts.     
               
               To the extent that the Fund invests in S&P 500 derivatives
            backed by a portfolio of fixed income securities, under certain
            conditions, generally in a market where the value of both S&P 500
            derivatives and fixed income securities are declining, the Fund
            may experience greater losses than would be the case if it were to
            invest directly in a portfolio of S&P 500 stocks.     
 
 
TOTAL       The "total return" sought by certain of the Funds will consist of
RETURN AND  interest and dividends from underlying securities, capital appre-
REAL RETURN ciation reflected in unrealized increases in value of portfolio
            securities (realized by the shareholder only upon selling shares),
            or realized from the purchase and sale of securities and use of
            futures and options, or gains from favorable changes in foreign
            currency exchange rates. Generally, over the long term, the total
            return obtained by a portfolio investing primarily in fixed income
            securities is not expected to be as great as that obtained by a
            portfolio that invests primarily in equity securities. At the same
            time, the market risk and price volatility of a fixed income port-
            folio is expected to be less than that of an equity portfolio, so
            that a fixed income portfolio is generally considered to be a more
            conservative investment. The change in market value of fixed in-
            come securities (and therefore their capital appreciation or de-
            preciation) is largely a function of changes in the current level
            of interest rates. Generally, when interest rates are falling, a
            portfolio with a shorter duration will not generate as high a
            level of total return as a portfolio with a longer duration. Con-
            versely, when interest rates are rising, a portfolio with a
            shorter duration will generally outperform
                                                     August 1, 1998 Prospectus
                                                                              9
<PAGE>
 
            longer duration portfolios. When interest rates are flat, shorter
            duration portfolios generally will not generate as high a level of
            total return as longer duration portfolios (assuming that long-
            term interest rates are higher than short-term rates, which is
            commonly the case). With respect to the composition of any fixed
            income portfolio, the longer the duration of the portfolio, the
            greater the anticipated potential for total return, with, however,
            greater attendant market risk and price volatility than for a
            portfolio with a shorter duration. The market value of fixed in-
            come securities denominated in currencies other than the U.S. dol-
            lar also may be affected by movements in foreign currency ex-
            change rates.
               The change in market value of equity securities (and therefore
            their capital appreciation or depreciation) may depend upon a num-
            ber of factors, including: conditions in the securities markets,
            the business success of the security's issuer, changing interest
            rates, real or perceived economic and competitive industry condi-
            tions, and foreign currency exchange rates. Historically, the to-
            tal return performance of equity-oriented portfolios has generally
            been greater over the long term than fixed income portfolios. How-
            ever, the market risk and price volatility of an equity portfolio
            is generally greater than that of a fixed income portfolio, and is
            generally considered to be a more aggressive investment.
               "Real Return," or "Inflation Adjusted Return," as referenced in
            the name and investment objective of the Real Return Bond Fund, is
            a measure of the change in purchasing power of money invested in a
            particular instrument after adjusting for inflation. An investment
            in a security generating a high nominal return (such as a typical
            U.S. Government Treasury bond) may not generate a high real return
            once inflation is considered. For example, an instrument generat-
            ing a 9% nominal return at a time when inflation is 6% has a real
            return of approximately 3%; that is, the purchasing power of the
            money invested in that instrument would only increase by approxi-
            mately 3%. On the other hand, an inflation-indexed instrument gen-
            erating a 5% real return would generate a 5% increase in purchas-
            ing power regardless of the rate of inflation. As stated above,
            the investment objective of the Fund is to seek to achieve maximum
            real return. The total return (not adjusted for inflation) at-
            tained by this Fund may be less than the total return attained by
            other of the Funds that do not invest primarily in inflation-in-
            dexed securities.
               In the case of inflation-indexed bonds, changes in market value
            are tied to the relationship between nominal interest rates and
            the rate of inflation. If inflation were to rise at a faster rate
            than nominal interest rates, real interest rates might decline,
            leading to an increase in value of inflation-indexed bonds. In
            contrast, if nominal interest rates increase at a faster rate than
            inflation, real interest rates might increase, leading to a de-
            crease in value of inflation-indexed bonds.
 
            Investment Risks and Considerations
 
            The following are some of the principal risks of investing in the
            Funds. Investors should read this Prospectus carefully for a more
            complete discussion of the risks relating to an investment in the
            Funds. The net asset value per share of any Fund may be less at
            the time of redemption than it was at the time of investment. Gen-
            erally, the value of fixed income securities can be expected to
            vary inversely with changes in prevailing interest rates, i.e., as
            interest rates rise, market value tends to decrease, and vice
            versa, although this may not be true in the case of inflation-
            indexed bonds. In addition, certain of the Funds may invest in se-
            curities rated lower than Baa by Moody's or S&P. Such securities
            carry a high degree of credit risk and are considered speculative
            by the major rating agencies.
               Certain Funds may invest in securities of foreign issuers,
            which may be subject to additional risk factors, including foreign
            currency and political risks, not applicable to securities of U.S.
            issuers. Certain of the Funds' investment techniques may involve a
            form of borrowing, which may tend to exaggerate the effect on net
            asset value of any increase or decrease in the market value of a
            Fund's portfolio and may require liquidation of portfolio posi-
            tions when it is not advantageous to do so. Certain Funds may sell
            securities short, which exposes the Fund to a risk of loss if the
            value of the security sold short should increase.
               All Funds may use derivative instruments, consisting of
            futures, options, options on futures, and swap agreements, for
            hedging purposes or as part of their investment strategies. Use of
            these instruments may involve certain costs and
 
10
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            risks, including the risk that a Fund could not close out a posi-
            tion when it would be most advantageous to do so, the risk of an
            imperfect correlation between the value of the securities being
            hedged and the value of the particular derivative instrument, and
            the risk that unexpected changes in interest rates may adversely
            affect the value of a Fund's investments in particular derivative
            instruments. Unless otherwise indicated, all limitations applica-
            ble to Fund investments (as stated in this Prospectus and in the
            Statement of Additional Information) apply only at the time a
            transaction is entered into. Any subsequent change in a rating as-
            signed by any rating service to a security (or, if unrated, deemed
            to be of comparable quality), or change in the percentage of Fund
            assets invested in certain securities or other instruments, or
            change in the average duration of a Fund's investment portfolio,
            resulting from market fluctuations or other changes in a Fund's
            total assets, will not require a Fund to dispose of an investment
            until the Adviser determines that is practicable to sell or close
            out the investment without undue market or tax consequences to the
            Fund. In the event that ratings services assign different ratings
            to the same security, the Adviser will determine which rating it
            believes best reflects the security's quality and risk at that
            time, which may be the higher of the several assigned ratings.
                
               Investors should carefully consider the possible tax conse-
            quences from investing in the Real Return Bond Fund. The Fund in-
            vests primarily in securities that for tax purposes may be consid-
            ered to have been issued originally at a discount. Accordingly,
            the Fund may be required to make annual distributions to share-
            holders in excess of the cash received by the Fund in a given pe-
            riod from those investments. See "Characteristics and Risks of Se-
            curities and Investment Techniques--Inflation-Indexed Bonds" and
            "Taxes" for additional information.
               The Real Return Bond and Foreign Bond Funds are "non-diversi-
            fied" for purposes of the Investment Company Act of 1940 ("1940
            Act"), meaning that they may invest a greater percentage of their
            assets in the securities of one issuer than the other Funds. The
            Funds are still, however, subject to diversification requirements
            imposed by the Internal Revenue Code of 1986, as amended, which
            means that as of the end of each calendar quarter, a Fund may have
            no more than 25% of its assets invested in the securities of a
            single issuer, and may, with respect to 50% of its assets, have no
            more than 5% of its assets invested in the securities of a single
            issuer. As "non-diversified" portfolios, these Funds may be more
            susceptible to risks associated with a single economic, political
            or regulatory occurrence than a diversified portfolio might be.
               
               The Funds offer their shares to both retail and institutional
            investors. Institutional shareholders, some of whom also may be
            investment advisory clients of Pacific Investment Management, may
            hold large positions in certain of the Funds. Such shareholders
            may on occasion make large redemptions of their holdings in the
            Funds to meet their liquidity needs, in connection with strategic
            adjustments to their overall portfolio of investments, or for
            other purposes. Large redemptions from some Funds could require
            the Adviser to liquidate portfolio positions when it is not most
            desirable to do so. Liquidation of portfolio holdings also may
            cause a Fund to realize taxable capital gains.     
 
            Characteristics and Risks of
            Securities and Investment Techniques
 
            The following describes in greater detail different types of secu-
            rities and investment techniques used by the individual Funds, and
            discusses certain concepts relevant to the investment policies of
            the Funds. Additional information about the Funds' investments and
            investment practices may be found in the Statement of Additional
            Information.
 
 
U.S.
GOVERNMENT  U.S. Government securities are obligations of, or guaranteed by,
SECURITIES  the U.S. Government, its agencies or instrumentalities. The U.S.
            Government does not guarantee the net asset value of the Funds'
            shares. Some U.S. Government securities, such as Treasury bills,
            notes and bonds, and securities guaranteed by the Government Na-
            tional Mortgage Association ("GNMA"), are supported by the full
            faith and credit of the United States; others, such as those of
            the Federal Home Loan Banks, are supported by the right of the is-
            suer to borrow from the U.S. Treasury; others, such as those of
            the Federal National Mortgage Association ("FNMA"), are supported
            by the discretionary authority of the U.S. Govern-
                                                     August 1, 1998 Prospectus
                                                                              11
<PAGE>
 
            ment to purchase the agency's obligations; and still others, such
            as those of the Student Loan Marketing Association, are supported
            only by the credit of the instrumentality. U.S. Government securi-
            ties include securities that have no coupons, or have been
            stripped of their unmatured interest coupons, individual interest
            coupons from such securities that trade separately, and evidences
            of receipt of such securities. Such securities may pay no cash in-
            come, and are purchased at a deep discount from their value at ma-
            turity. Because interest on zero coupon securities is not distrib-
            uted on a current basis but is, in effect, compounded, zero coupon
            securities tend to be subject to greater market risk than inter-
            est-paying securities of similar maturities. Custodial receipts
            issued in connection with so-called trademark zero coupon securi-
            ties, such as CATs and TIGRs, are not issued by the U.S. Treasury,
            and are therefore not U.S. Government securities, although the un-
            derlying bond represented by such receipt is a debt obligation of
            the U.S. Treasury. Other zero coupon Treasury securities (STRIPs
            and CUBEs) are direct obligations of the U.S. Government.
 
 
CORPORATE   Corporate debt securities include corporate bonds, debentures,
DEBT        notes and other similar corporate debt instruments, including con-
SECURITIES  vertible securities. Debt securities may be acquired with warrants
            attached. Corporate income-producing securities may also include
            forms of preferred or preference stock. The rate of interest on a
            corporate debt security may be fixed, floating or variable, and
            may vary inversely with respect to a reference rate. See "Variable
            and Floating Rate Securities" below. The rate of return or return
            of principal on some debt obligations may be linked or indexed to
            the level of exchange rates between the U.S. dollar and a foreign
            currency or currencies.
               
               Investments in corporate debt securities that are rated below
            investment grade (rated below Baa (Moody's) or BBB (S&P)) are de-
            scribed as "speculative" both by Moody's and S&P. Such securities
            are sometimes referred to as "junk bonds," and may be subject to
            greater market fluctuations, less liquidity and greater risk of
            loss of income or principal, including a greater possibility of
            default or bankruptcy of the issuer of such securities, than are
            more highly rated debt securities. Moody's also describes securi-
            ties rated Baa as having speculative characteristics. The Adviser
            seeks to minimize these risks through diversification, in-depth
            credit analysis and attention to current developments in interest
            rates and market conditions. See "Appendix B--Description of Secu-
            rities Ratings." Investments in high yield securities are dis-
            cussed separately below under "High Yield Securities ("Junk
            Bonds")."     
 
 
CONVERTIBLE Each Fund (except the Municipal Bond Fund) may invest in convert-
SECURITIES  ible securities, which may offer higher income than the common
            stocks into which they are convertible. Typically, convertible se-
            curities are callable by the company, which may, in effect, force
            conversion before the holder would otherwise choose.
               The convertible securities in which the Funds may invest con-
            sist of bonds, notes, debentures and preferred stocks which may be
            converted or exchanged at a stated or determinable exchange ratio
            into underlying shares of common stock. A Fund may be required to
            permit the issuer of a convertible security to redeem the securi-
            ty, convert it into the underlying common stock, or sell it to a
            third party. Thus, a Fund may not be able to control whether the
            issuer of a convertible security chooses to convert that security.
            If the issuer chooses to do so, this action could have an adverse
            effect on a Fund's ability to achieve its investment objectives.
               While the Fixed Income Funds intend to invest primarily in
            fixed income securities, each may invest in convertible securities
            or equity securities. While some countries or companies may be re-
            garded as favorable investments, pure fixed income opportunities
            may be unattractive or limited due to insufficient supply, legal
            or technical restrictions. In such cases, a Fund may consider eq-
            uity securities or convertible bonds to gain exposure to such in-
            vestments.
 
 
LOAN
PARTICIPATIONS
AND
ASSIGNMENTS
            Certain Funds may invest in fixed- and floating-rate loans ar-
            ranged through private negotiations between an issuer of debt in-
            struments and one or more financial institutions ("lenders"). Gen-
            erally, the Funds' investments in loans are expected to take the
            form of loan participations and assignments of portions of loans
            from third parties.
               Large loans to corporations or governments may be shared or
            syndicated among several lenders, usually banks. The Funds may
            participate in such syndicates, or can buy part of a loan, becom-
            ing a direct lender. Participations and assignments involve spe-
            cial types of risk, including limited marketability and the risks
            of being a lender. See "Illiquid
 
12
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Securities" for a discussion of the limits on a Fund's investments
            in loan participations and assignments with limited marketability.
            If a Fund purchases a participation, it may only be able to en-
            force its rights through the lender, and may assume the credit
            risk of the lender in addition to the borrower. In assignments,
            the Funds' rights against the borrower may be more limited than
            those held by the original lender.
 
 
DELAYED     The Funds (except the PIMCO Municipal Bond Fund) may also enter
FUNDING     into, or acquire participations in, delayed funding loans and re-
LOANS AND   volving credit facilities. Delayed funding loans and revolving
REVOLVING   credit facilities are borrowing arrangements in which the lender
CREDIT      agrees to make loans up to a maximum amount upon demand by the
FACILITIES  borrower during a specified term. A revolving credit facility dif-
            fers from a delayed funding loan in that as the borrower repays
            the loan, an amount equal to the repayment may be borrowed again
            during the term of the revolving credit facility. These commit-
            ments may have the effect of requiring a Fund to increase its in-
            vestment in a company at a time when it might not otherwise decide
            to do so (including at a time when the company's financial condi-
            tion makes it unlikely that such amounts will be repaid).
               
               The Funds may acquire a participation interest in delayed fund-
            ing loans or revolving credit facilities from a bank or other fi-
            nancial institution. See "Loan Participations and Assignments."
            The terms of the participation require the Fund to make a pro rata
            share of all loans extended to the borrower and entitles the Fund
            to a pro rata share of all payments made by the borrower. Delayed
            funding loans and revolving credit facilities usually provide for
            floating or variable rates of interest. To the extent that a Fund
            is committed to advance additional funds, it will at all times
            segregate assets, determined to be liquid by the Adviser in accor-
            dance with procedures established by the Board of Trustees, in an
            amount sufficient to meet such commitments.     
 
 
 
VARIABLE    Variable and floating rate securities provide for a periodic ad-
AND         justment in the interest rate paid on the obligations. The terms
FLOATING    of such obligations must provide that interest rates are adjusted
RATE        periodically based upon an interest rate adjustment index as pro-
SECURITIES  vided in the respective obligations. The adjustment intervals may
            be regular, and range from daily up to annually, or may be event
            based, such as based on a change in the prime rate.
               Each of the Fixed Income Funds may invest in floating rate debt
            instruments ("floaters") and (except the Municipal Bond Fund) en-
            gage in credit spread trades. The interest rate on a floater is a
            variable rate which is tied to another interest rate, such as a
            money-market index or Treasury bill rate. The interest rate on a
            floater resets periodically, typically every six months. While,
            because of the interest rate reset feature, floaters provide a
            Fund with a certain degree of protection against rises in interest
            rates, a Fund will participate in any declines in interest rates
            as well. A credit spread trade is an investment position relating
            to a difference in the prices or interest rates of two securities
            or currencies, where the value of the investment position is de-
            termined by movements in the difference between the prices or in-
            terest rates, as the case may be, of the respective securities or
            currencies.
               Each of the Fixed Income Funds (except the Municipal Bond Fund)
            may also invest in inverse floating rate debt instruments ("in-
            verse floaters"). The interest rate on an inverse floater resets
            in the opposite direction from the market rate of interest to
            which the inverse floater is indexed. An inverse floating rate se-
            curity may exhibit greater price volatility than a fixed rate ob-
            ligation of similar credit quality. The Funds have adopted a pol-
            icy under which no Fund will invest more than 5% (10% in the case
            of the Total Return Mortgage Fund) of its net assets in any combi-
            nation of inverse floater, interest only ("IO"), or principal only
            ("PO") securities. See "Mortgage-Related and Other Asset-Backed
            Securities" for a discussion of IOs and POs.
 
 
INFLATION-
INDEXED     Inflation-indexed bonds are fixed income securities whose princi-
BONDS       pal value is periodically adjusted according to the rate of infla-
            tion. The interest rate on these bonds is generally fixed at issu-
            ance at a rate lower than typical bonds. Over the life of an in-
            flation-indexed bond, however, interest will be paid based on a
            principal value which is adjusted for inflation.
               Inflation-indexed securities issued by the U.S. Treasury will
            initially have maturities of five or ten years, although it is an-
            ticipated that securities with other maturities will be issued in
            the future. The securities will pay interest on a semi-annual ba-
            sis, equal to a fixed percentage of the inflation-adjusted princi-
            pal amount. For example, if an investor
                                                     August 1, 1998 Prospectus
                                                                              13
<PAGE>
 
            purchased an inflation-indexed bond with a par value of $1,000 and
            a 3% real rate of return coupon (payable 1.5% semi-annually), and
            inflation over the first six months were 1%, the mid-year par
            value of the bond would be $1,010 and the first semi-annual inter-
            est payment would be $15.15 ($1,010 times 1.5%). If inflation dur-
            ing the second half of the year reached 3%, the end-of-year par
            value of the bond would be $1,030 and the second semi-annual in-
            terest payment would be $15.45 ($1,030 times 1.5%).
               If the periodic adjustment rate measuring inflation falls, the
            principal value of inflation-indexed bonds will be adjusted down-
            ward, and consequently the interest payable on these securities
            (calculated with respect to a smaller principal amount) will be
            reduced. Repayment of the original bond principal upon maturity
            (as adjusted for inflation) is guaranteed in the case of U.S.
            Treasury inflation-indexed bonds, even during a period of defla-
            tion. However, the current market value of the bonds is not guar-
            anteed, and will fluctuate. The Funds may also invest in other in-
            flation related bonds which may or may not provide a similar guar-
            antee. If such a guarantee of principal is not provided, the ad-
            justed principal value of the bond repaid at maturity may be less
            than the original principal.
               The value of inflation-indexed bonds is expected to change in
            response to changes in real interest rates. Real interest rates in
            turn are tied to the relationship between nominal interest rates
            and the rate of inflation. Therefore, if inflation were to rise at
            a faster rate than nominal interest rates, real interest rates
            might decline, leading to an increase in value of inflation-in-
            dexed bonds. In contrast, if nominal interest rates increased at a
            faster rate than inflation, real interest rates might rise, lead-
            ing to a decrease in value of inflation-indexed bonds.
               While these securities are expected to be protected from long-
            term inflationary trends, short-term increases in inflation may
            lead to a decline in value. If interest rates rise due to reasons
            other than inflation (for example, due to changes in currency ex-
            change rates), investors in these securities may not be protected
            to the extent that the increase is not reflected in the bond's in-
            flation measure.
               The U.S. Treasury has only recently begun issuing inflation-in-
            dexed bonds. As such, there is no trading history of these securi-
            ties, and there can be no assurance that a liquid market in these
            instruments will develop, although one is expected. Lack of a liq-
            uid market may impose the risk of higher transaction costs and the
            possibility that a Fund may be forced to liquidate positions when
            it would not be advantageous to do so. There also can be no assur-
            ance that the U.S. Treasury will issue any particular amount of
            inflation-indexed bonds. Certain foreign governments, such as the
            United Kingdom, Canada and Australia, have a longer history of is-
            suing inflation-indexed bonds, and there may be a more liquid mar-
            ket in certain of these countries for these securities.
               The periodic adjustment of U.S. inflation-indexed bonds is tied
            to the Consumer Price Index for Urban Consumers ("CPI-U"), which
            is calculated monthly by the U.S. Bureau of Labor Statistics. The
            CPI-U is a measurement of changes in the cost of living, made up
            of components such as housing, food, transportation and energy.
            Inflation-indexed bonds issued by a foreign government are gener-
            ally adjusted to reflect a comparable inflation index, calculated
            by that government. There can be no assurance that the CPI-U or
            any foreign inflation index will accurately measure the real rate
            of inflation in the prices of goods and services. Moreover, there
            can be no assurance that the rate of inflation in a foreign coun-
            try will be correlated to the rate of inflation in the United
            States.
               Any increase in the principal amount of an inflation-indexed
            bond will be considered taxable ordinary income, even though in-
            vestors do not receive their principal until maturity. See "Taxes"
            for information about the possible tax consequences of investing
            in the Real Return Bond Fund and in inflation-indexed bonds.
 
MORTGAGE-      
RELATED AND Each of the Funds (except the Municipal Bond Fund) may invest all
OTHER       of its assets in mortgage- or other asset-backed securities. The
ASSET-      value of some mortgage- or asset-backed securities in which the
BACKED      Funds invest may be particularly sensitive to changes in prevail-
SECURITIES  ing interest rates, and, like the other investments of the Funds,
            the ability of a Fund to successfully utilize these instruments
            may depend in part upon the ability of the Adviser to forecast in-
            terest rates and other economic factors correctly.     
 
14
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
            MORTGAGE-PASS-THROUGH SECURITIES are securities representing in-
            terests in "pools" of mortgage loans secured by residential or
            commercial real property in which payments of both interest and
            principal on the securities are generally made monthly, in effect
            "passing through" monthly payments made by the individual borrow-
            ers on the mortgage loans which underlie the securities (net of
            fees paid to the issuer or guarantor of the securities). Early re-
            payment of principal on some mortgage-related securities (arising
            from prepayments of principal due to sale of the underlying prop-
            erty, refinancing, or foreclosure, net of fees and costs which may
            be incurred) may expose a Fund to a lower rate of return upon re-
            investment of principal. Also, if a security subject to prepayment
            has been purchased at a premium, the value of the premium would be
            lost in the event of prepayment. Like other fixed income securi-
            ties, when interest rates rise, the value of a mortgage-related
            security generally will decline; however, when interest rates are
            declining, the value of mortgage-related securities with prepay-
            ment features may not increase as much as other fixed income secu-
            rities. The rate of prepayments on underlying mortgages will af-
            fect the price and volatility of a mortgage-related security, and
            may have the effect of shortening or extending the effective matu-
            rity of the security beyond what was anticipated at the time of
            purchase. To the extent that unanticipated rates of prepayment on
            underlying mortgages increase the effective maturity of a mort-
            gage-related security, the volatility of such security can be ex-
            pected to increase.
               Payment of principal and interest on some mortgage pass-through
            securities (but not the market value of the securities themselves)
            may be guaranteed by the full faith and credit of the U.S. Govern-
            ment (in the case of securities guaranteed by GNMA); or guaranteed
            by agencies or instrumentalities of the U.S. Government (in the
            case of securities guaranteed by FNMA or the Federal Home Loan
            Mortgage Corporation ("FHLMC"), which are supported only by the
            discretionary authority of the U.S. Government to purchase the
            agency's obligations). Mortgage-related securities created by non-
            governmental issuers (such as commercial banks, savings and loan
            institutions, private mortgage insurance companies, mortgage bank-
            ers and other secondary market issuers) may be supported by vari-
            ous forms of insurance or guarantees, including individual loan,
            title, pool and hazard insurance and letters of credit, which may
            be issued by governmental entities, private insurers or the mort-
            gage poolers.
 
            COLLATERALIZED MORTGAGE OBLIGATIONS ("CMOs") are hybrid mortgage-
            related instruments. Interest and pre-paid principal on a CMO are
            paid, in most cases, on a monthly basis. CMOs may be collateral-
            ized by whole mortgage loans but are more typically collateralized
            by portfolios of mortgage pass-through securities guaranteed by
            GNMA, FHLMC, or FNMA. CMOs are structured into multiple classes,
            with each class bearing a different stated maturity. Monthly pay-
            ments of principal, including prepayments, are first returned to
            investors holding the shortest maturity class; investors holding
            the longer maturity classes receive principal only after the first
            class has been retired. CMOs that are issued or guaranteed by the
            U.S. Government or by any of its agencies or instrumentalities
            will be considered U.S. Government securities by the Funds, while
            other CMOs, even if collateralized by U.S. Government securities,
            will have the same status as other privately issued securities for
            purposes of applying a Fund's diversification tests.
 
            COMMERCIAL MORTGAGE-BACKED SECURITIES include securities that re-
            flect an interest in, and are secured by, mortgage loans on com-
            mercial real property. The market for commercial mortgage-backed
            securities developed more recently and in terms of total outstand-
            ing principal amount of issues is relatively small compared to the
            market for residential single-family mortgage-backed securities.
            Many of the risks of investing in commercial mortgage-backed secu-
            rities reflect the risks of investing in the real estate securing
            the underlying mortgage loans. These risks reflect the effects of
            local and other economic conditions on real estate markets, the
            ability of tenants to make loan payments, and the ability of a
            property to attract and retain tenants. Commercial mortgage-backed
            securities may be less liquid and exhibit greater price volatility
            than other types of mortgage-related or asset-backed securities.
 
            MORTGAGE-RELATED SECURITIES include securities other than those
            described above that directly or indirectly represent a participa-
            tion in, or are secured by and payable from, mortgage loans on
            real property, such as mortgage dollar rolls (see "Reverse Repur-
            chase Agreements, Dollar Rolls, and Borrowings"), CMO residuals or
            stripped mortgage-backed securities ("SMBS"), and may be struc-
            tured in classes with rights to receive varying proportions of
            principal and interest.
 
                                                                             15
                                                     August 1, 1998 Prospectus
<PAGE>
 
               A common type of SMBS will have one class receiving some of the
            interest and most of the principal from the mortgage assets, while
            the other class will receive most of the interest and the remain-
            der of the principal. In the most extreme case, one class will re-
            ceive all of the interest (the interest-only, or "IO" class),
            while the other class will receive all of the principal (the prin-
            cipal-only, or "PO" class). The yield to maturity on an IO class
            is extremely sensitive to the rate of principal payments (includ-
            ing prepayments) on the related underlying mortgage assets, and a
            rapid rate of principal payments may have a material adverse ef-
            fect on a Fund's yield to maturity from these securities. The
            Funds have adopted a policy under which no Fund will invest more
            than 5% (10% in the case of the Total Return Mortgage Fund) of its
            net assets in any combination of IO, PO, or inverse floater secu-
            rities. The Funds may invest in other asset-backed securities that
            have been offered to investors. For a discussion of the character-
            istics of some of these instruments, see the Statement of Addi-
            tional Information.
 
MUNICIPAL   The Municipal Bond Fund invests in Municipal Bonds which are gen-
BONDS       erally issued by states and local governments and their agencies,
            authorities and other instrumentalities. The Municipal Bonds which
            the Municipal Bond Fund may purchase include general obligation
            bonds and limited obligation bonds (or revenue bonds), including
            industrial development bonds issued pursuant to former federal tax
            law. General obligation bonds are obligations involving the credit
            of an issuer possessing taxing power and are payable from such is-
            suer's general revenues and not from any particular source. Lim-
            ited obligation bonds are payable only from the revenues derived
            from a particular facility or class of facilities or, in some
            cases, from the proceeds of a special excise or other specific
            revenue source. Tax-exempt "private activity" bonds and industrial
            development bonds generally are also revenue bonds and thus are
            not payable from the issuer's general revenues. The Municipal Bond
            Fund may invest in Municipal Bonds with credit enhancements such
            as letters of credit, municipal bond insurance and Standby Bond
            Purchase Agreements. The Municipal Bond Fund may also invest in
            municipal lease obligations, as well as securities derived from
            Municipal Bonds, such as residual interest bonds, and participa-
            tion interests.
               Municipal Bonds are subject to credit and market risk. Credit
            risk relates to the ability of the issuer to make payments of
            principal and interest. The ability of an issuer to make such pay-
            ments could be affected by litigation, legislation or other polit-
            ical events or the bankruptcy of the issuer. Market risk relates
            to changes in a security's value as a result of changes in inter-
            est rates. Lower rated Municipal Bonds generally provide higher
            yields but are subject to greater credit and market risk than
            higher quality Municipal Bonds.
 
REPURCHASE  For the purpose of achieving income, each of the Funds may enter
AGREEMENTS  into repurchase agreements, which entail the purchase of a portfo-
            lio-eligible security from a bank or broker-dealer that agrees to
            repurchase the security at the Fund's cost plus interest within a
            specified time (normally one day). If the party agreeing to repur-
            chase should default, as a result of bankruptcy or otherwise, the
            Fund will seek to sell the securities which it holds, which action
            could involve procedural costs or delays in addition to a loss on
            the securities if their value should fall below their repurchase
            price. No Fund will invest more than 15% of its net assets (taken
            at current market value) in repurchase agreements maturing in more
            than seven days.
 
REVERSE
REPURCHASE     
AGREEMENTS, A reverse repurchase agreement involves the sale of a security by
DOLLAR      a Fund and its agreement to repurchase the instrument at a speci-
ROLLS, AND  fied time and price. Under a reverse repurchase agreement, the
BORROWINGS  Fund continues to receive any principal and interest payments on
            the underlying security during the term of the agreement. The Fund
            generally will segregate assets determined to be liquid by the Ad-
            viser in accordance with procedures established by the Board of
            Trustees to cover its obligations under reverse repurchase agree-
            ments and, to this extent, a reverse repurchase agreement (or eco-
            nomically similar transaction) will not be considered a "senior
            security" subject to the 300% asset coverage requirements other-
            wise applicable to borrowings by a Fund.     
               A Fund may enter into dollar rolls, in which the Fund sells
            mortgage-backed or other securities for delivery in the current
            month and simultaneously contracts to purchase substantially simi-
            lar securities on a specified future date. In the case of dollar
            rolls involving mortgage-backed securities, the mortgage-backed
            securities that are purchased will be of the
 
16
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            same type and will have the same interest rate as those sold, but
            will be supported by different pools of mortgages. The Fund for-
            goes principal and interest paid during the roll period on the se-
            curities sold in a dollar roll, but the Fund is compensated by the
            difference between the current sales price and the lower price for
            the future purchase as well as by any interest earned on the pro-
            ceeds of the securities sold. The Fund also could be compensated
            through the receipt of fee income equivalent to a lower forward
            price. The Fund will segregate assets determined to be liquid by
            the Adviser in accordance with procedures established by the Board
            of Trustees to cover its obligations under dollar rolls.     
               
               To the extent that positions in reverse repurchase agreements,
            dollar rolls or similar transactions are not covered through the
            maintenance of segregated liquid assets at least equal to the
            amount of any forward purchase commitment, such transactions would
            be subject to the Funds' limitations on borrowings, which would
            restrict the aggregate of such transactions (plus any other
            borrowings) to 33 1/3% of such Fund's total assets. Apart from
            such transactions, a Fund will not borrow money, except for tempo-
            rary administrative purposes.     
 
 
LOANS OF    For the purpose of achieving income, each Fund may lend its port-
PORTFOLIO   folio securities to brokers, dealers, and other financial institu-
SECURITIES  tions, provided:
                (i) the loan is secured continuously by collateral consisting
                    of U.S. Government securities, cash or cash equivalents
                    (negotiable certificates of deposit, bankers' acceptances
                    or letters of credit) maintained on a daily mark-to-market
                    basis in an amount at least equal to the current market
                    value of the securities loaned;
                (ii) the Fund may at any time call the loan and obtain the
                     return of the securities loaned;
                (iii) the Fund will receive any interest or dividends paid on
                      the loaned securities; and
                (iv) the aggregate market value of securities loaned will not
                     at any time exceed 33 1/3% of the total assets of the
                     Fund.
               Each Fund's performance will continue to reflect changes in the
            value of the securities loaned and will also reflect the receipt
            of either interest, through investment of cash collateral by the
            Fund in permissible investments, or a fee, if the collateral is
            U.S. Government securities. Securities lending involves the risk
            of loss of rights in the collateral or delay in recovery of the
            collateral should the borrower fail to return the security loaned
            or become insolvent. The Funds may pay lending fees to the party
            arranging the loan.
               
WHEN-       Each of the Funds may purchase or sell securities on a when-is-
ISSUED,     sued, delayed delivery, or forward commitment basis. These trans-
DELAYED     actions involve a commitment by the Fund to purchase or sell secu-
DELIVERY    rities for a predetermined price or yield, with payment and deliv-
AND FORWARD ery taking place more than seven days in the future, or after a
COMMITMENT  period longer than the customary settlement period for that type
TRANSACTIONSof security. When such purchases are outstanding, the Fund will
            segregate until the settlement date assets determined to be liquid
            by the Adviser in accordance with procedures established by the
            Board of Trustees, in an amount sufficient to meet the purchase
            price. Typically, no income accrues on securities a Fund has com-
            mitted to purchase prior to the time delivery of the securities is
            made, although a Fund may earn income on securities it has segre-
            gated.     
               When purchasing a security on a when-issued, delayed delivery,
            or forward commitment basis, the Fund assumes the rights and risks
            of ownership of the security, including the risk of price and
            yield fluctuations, and takes such fluctuations into account when
            determining its net asset value. Because the Fund is not required
            to pay for the security until the delivery date, these risks are
            in addition to the risks associated with the Fund's other invest-
            ments. If the Fund remains substantially fully invested at a time
            when when-issued, delayed delivery, or forward commitment pur-
            chases are outstanding, the purchases may result in a form of lev-
            erage.
               
               When the Fund has sold a security on a when-issued, delayed de-
            livery, or forward commitment basis, the Fund does not participate
            in future gains or losses with respect to the security. If the
            other party to a transaction fails to deliver or pay for the secu-
            rities, the Fund could miss a favorable price or yield opportunity
            or could suffer a loss. A Fund may dispose of or renegotiate a
            transaction after it is entered into, and may sell when-issued,
            delayed delivery or forward commitment securities before they are
            delivered, which may result in a capital gain or loss. There is no
            percentage     
 
                                                                             17
                                                     August 1, 1998 Prospectus
<PAGE>
 
            limitation on the extent to which the Funds may purchase or sell
            securities on a when-issued, delayed delivery, or forward commit-
            ment basis.
 
 
SHORT SALES    
            Each of the Funds (except the High Yield and StocksPLUS Funds) may
            from time to time effect short sales as part of their overall
            portfolio management strategies, including the use of derivative
            instruments, or to offset potential declines in value of long po-
            sitions in similar securities as those sold short. A short sale
            (other than a short sale against the box) is a transaction in
            which a Fund sells a security it does not own at the time of the
            sale in anticipation that the market price of that security will
            decline. To the extent that a Fund engages in short sales, it must
            (except in the case of short sales "against the box") maintain as-
            set coverage in the form of segregated assets determined to be
            liquid by the Adviser in accordance with procedures established by
            the Board of Trustees or otherwise cover its position in a permis-
            sible manner. A short sale is "against the box" to the extent that
            the Fund contemporaneously owns, or has the right to obtain at no
            added cost, securities identical to those sold short.     
 
 
FOREIGN     Each of the Funds (except the Municipal Bond Fund) may invest di-
SECURITIES  rectly in fixed income securities of non-U.S. issuers. The Total
            Return Mortgage and High Yield Funds may only invest in U.S. dol-
            lar-denominated fixed income securities of non-U.S. issuers. The
            StocksPLUS Fund may invest directly in foreign equity securities.
               Each of the Funds will concentrate its foreign investments in
            securities of issuers based in developed countries. However, the
            Short-Term and Low Duration Funds may each invest up to 5% of its
            assets in securities of issuers based in emerging market coun-
            tries, and each of the remaining Fixed Income Funds that may in-
            vest in foreign securities may invest up to 10% of its assets in
            such securities.
               Individual foreign economies may differ favorably or unfavor-
            ably from the U.S. economy in such respects as growth of gross do-
            mestic product, rate of inflation, capital reinvestment, re-
            sources, self-sufficiency and balance of payments position. The
            securities markets, values of securities, yields, and risks asso-
            ciated with securities markets in different countries may change
            independently of each other. Investing in the securities of is-
            suers in any foreign country involves special risks and considera-
            tions not typically associated with investing in U.S. companies.
            Shareholders should consider carefully the substantial risks in-
            volved in investing in securities issued by companies and govern-
            ments of foreign nations. These risks include: differences in ac-
            counting, auditing and financial reporting standards; generally
            higher commission rates on foreign portfolio transactions; the
            possibility of nationalization, expropriation or confiscatory tax-
            ation; adverse changes in investment or exchange control regula-
            tions (which may include suspension of the ability to transfer
            currency from a country); and political instability which could
            affect U.S. investments in foreign countries. Additionally, for-
            eign securities and dividends and interest payable on those secu-
            rities may be subject to foreign taxes, including taxes withheld
            from payments on those securities. Foreign securities often trade
            with less frequency and volume than domestic securities and there-
            fore may exhibit greater price volatility. Additional costs asso-
            ciated with an investment in foreign securities may include higher
            custodial fees than apply to domestic custodial arrangements and
            transaction costs of foreign currency conversions. Changes in for-
            eign exchange rates also will affect the value of securities de-
            nominated or quoted in currencies other than the U.S. dollar.
               Certain of the Funds will invest in the securities of issuers
            based in countries with developing economies. Investing in devel-
            oping (or "emerging market") countries involves certain risks not
            typically associated with investing in U.S. securities, and im-
            poses risks greater than, or in addition to, risks of investing in
            foreign, developed countries. A number of emerging market coun-
            tries restrict, to varying degrees, foreign investment in securi-
            ties. Repatriation of investment income, capital, and the proceeds
            of sales by foreign investors may require governmental registra-
            tion and/or approval in some emerging market countries. A number
            of the currencies of emerging market countries have experienced
            significant declines against the U.S. dollar in recent years, and
            devaluation may occur subsequent to investments in these curren-
            cies by a Fund. Inflation and rapid fluctuations in inflation
            rates have had, and may continue to have, negative effects on the
            economies and securities markets of certain emerging market coun-
            tries. Many of the emerging securities markets are relatively
            small, have low trading volumes, suffer periods of relative illi-
            quidity, and are characterized by significant
 
18
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            price volatility. There is a risk in emerging market countries
            that a future economic or political crisis could lead to price
            controls, forced mergers of companies, expropriation or confisca-
            tory taxation, seizure, nationalization, or creation of government
            monopolies, any of which may have a detrimental effect on a Fund's
            investment.
               Additional risks of investing in emerging market countries may
            include: currency exchange rate fluctuations; greater social, eco-
            nomic and political uncertainty and instability (including the
            risk of war); more substantial governmental involvement in the
            economy; less governmental supervision and regulation of the secu-
            rities markets and participants in those markets; unavailability
            of currency hedging techniques in certain emerging market coun-
            tries; the fact that companies in emerging market countries may be
            newly organized and may be smaller and less seasoned companies;
            the difference in, or lack of, auditing and financial reporting
            standards, which may result in unavailability of material informa-
            tion about issuers; the risk that it may be more difficult to ob-
            tain and/or enforce a judgment in a court outside the United
            States; and significantly smaller market capitalization of securi-
            ties markets. Also, any change in the leadership or policies of
            Eastern European countries, or the countries that exercise a sig-
            nificant influence over those countries, may halt the expansion of
            or reverse the liberalization of foreign investment policies now
            occurring and adversely affect existing investment opportunities.
               In addition, emerging securities markets may have different
            clearance and settlement procedures, which may be unable to keep
            pace with the volume of securities transactions or otherwise make
            it difficult to engage in such transactions. Settlement problems
            may cause a Fund to miss attractive investment opportunities, hold
            a portion of its assets in cash pending investment, or delay in
            disposing of a portfolio security. Such a delay could result in
            possible liability to a purchaser of the security.
               Each of the Fixed Income Funds (except the Municipal Bond Fund)
            may invest in Brady Bonds. Brady Bonds are securities created
            through the exchange of existing commercial bank loans to sover-
            eign entities for new obligations in connection with debt
            restructurings under a debt restructuring plan introduced by for-
            mer U.S. Secretary of the Treasury, Nicholas F. Brady. Brady Bonds
            have been issued only recently, and for that reason do not have a
            long payment history. Brady Bonds may be collateralized or
            uncollateralized, are issued in various currencies (but primarily
            the U.S. dollar), and are actively traded in the over-the-counter
            secondary market. Brady Bonds are not considered to be U.S. Gov-
            ernment securities. In light of the residual risk of Brady Bonds
            and, among other factors, the history of defaults with respect to
            commercial bank loans by public and private entities in countries
            issuing Brady Bonds, investments in Brady Bonds may be viewed as
            speculative. There can be no assurance that Brady Bonds acquired
            by a Fund will not be subject to restructuring arrangements or to
            requests for new credit, which may cause the Fund to suffer a loss
            of interest or principal on any of its holdings. For further in-
            formation, see the Statement of Additional Information.
               Certain of the Funds also may invest in sovereign debt (other
            than Brady Bonds) issued by governments, their agencies or instru-
            mentalities, or other government-related entities located in
            emerging market countries. Holders of sovereign debt may be re-
            quested to participate in the rescheduling of such debt and to ex-
            tend further loans to governmental entities. In addition, there is
            no bankruptcy proceeding by which defaulted sovereign debt may be
            collected.
               A Fund's investments in foreign currency denominated debt obli-
            gations and hedging activities will likely produce a difference
            between its book income and its taxable income. This difference
            may cause a portion of the Fund's income distributions to consti-
            tute returns of capital for tax purposes or require the Fund to
            make distributions exceeding book income to qualify as a regulated
            investment company for federal tax purposes.
 
 
FOREIGN
CURRENCY    Foreign currency exchange rates may fluctuate significantly over
TRANSACTIONSshort periods of time. They generally are determined by the forces
            of supply and demand in the foreign exchange markets and the rela-
            tive merits of investments in different countries, actual or per-
            ceived changes in interest rates and other complex factors, as
            seen from an international perspective. Currency exchange rates
            also can be affected unpredictably by intervention (or the failure
            to intervene) by U.S. or foreign governments or central banks, by
            currency controls or political developments in the U.S. or abroad.
            For example, significant uncertainty surrounds the proposed intro-
            duction of the euro (a common currency for the European Union) in
            January 1999 and its effect on the value of securities denominated
            in local European currencies. These and
 
                                                                             19
                                                     August 1, 1998 Prospectus
<PAGE>
 
            other currencies in which the Funds' assets are denominated may be
            devalued against the U.S. dollar, resulting in a loss to the
            Funds.
               
               All Funds that may invest in securities denominated in foreign
            currencies may buy and sell foreign currencies on a spot and for-
            ward basis to reduce the risks of adverse changes in foreign ex-
            change rates. A forward foreign currency exchange contract in-
            volves an obligation to purchase or sell a specific currency at a
            future date, which may be any fixed number of days from the date
            of the contract agreed upon by the parties, at a price set at the
            time of the contract. By entering into a forward foreign currency
            exchange contract, the Fund "locks in" the exchange rate between
            the currency it will deliver and the currency it will receive for
            the duration of the contract. As a result, a Fund reduces its ex-
            posure to changes in the value of the currency it will deliver and
            increases its exposure to changes in the value of the currency it
            will exchange into. The effect on the value of a Fund is similar
            to selling securities denominated in one currency and purchasing
            securities denominated in another. Contracts to sell foreign cur-
            rency would limit any potential gain which might be realized by a
            Fund if the value of the hedged currency increases. A Fund may en-
            ter into these contracts for the purpose of hedging against for-
            eign exchange risk arising from the Fund's investment or antici-
            pated investment in securities denominated in foreign currencies.
            A Fund also may enter into these contracts for purposes of in-
            creasing exposure to a foreign currency or to shift exposure to
            foreign currency fluctuations from one country to another. A Fund
            may use one currency (or a basket of currencies) to hedge against
            adverse changes in the value of another currency (or a basket of
            currencies) when exchange rates between the two currencies are
            positively correlated. Each Fund will segregate assets determined
            to be liquid by the Adviser in accordance with procedures estab-
            lished by the Board of Trustees, to cover its obligations under
            forward foreign currency exchange contracts entered into for non-
            hedging purposes.     
               All Funds that may invest in securities denominated in foreign
            currencies may invest in options on foreign currencies and foreign
            currency futures and options thereon. The Funds also may invest in
            foreign currency exchange- related securities, such as foreign
            currency warrants and other instruments whose return is linked to
            foreign currency exchange rates. Each Fund that may invest in se-
            curities denominated in foreign currencies, except the Emerging
            Markets Bond Fund, will use these techniques to hedge at least 75%
            of its exposure to foreign currency. For a description of these
            instruments, see "Derivative Instruments" below and the Statement
            of Additional Information.
 
 
HIGH YIELD     
SECURITIES  The High Yield Fund invests at least 65% of its assets in fixed
("JUNK      income securities rated lower than Baa by Moody's or lower than
BONDS")     BBB by S&P but rated at least B by Moody's or S&P (or, if not rat-
            ed, of comparable quality). In addition, each of the Short-Term,
            Low Duration, Real Return Bond, Total Return, Foreign Bond, Stra-
            tegic Balanced and StocksPLUS Funds may invest up to 10% of its
            assets in such securities. The Municipal Bond Fund may invest up
            to 10% of its assets in securities rated lower than Baa by Moody's
            or BBB by S&P but rated at least Ba by Moody's or BB by S&P. Secu-
            rities rated lower than Baa by Moody's or lower than BBB by S&P
            are sometimes referred to as "high yield" or "junk" bonds. Securi-
            ties rated Baa are considered by Moody's to have some speculative
            characteristics. Investors should consider the following risks as-
            sociated with high yield securities before investing in these
            Funds.     
               Investing in high yield securities involves special risks in
            addition to the risks associated with investments in higher rated
            fixed income securities. High yield securities may be regarded as
            predominately speculative with respect to the issuer's continuing
            ability to meet principal and interest payments. Analysis of the
            creditworthiness of issuers of high yield securities may be more
            complex than for issuers of higher quality debt securities, and
            the ability of a Fund to achieve its investment objective may, to
            the extent of its investments in high yield securities, be more
            dependent upon such creditworthiness analysis than would be the
            case if the Fund were investing in higher quality securities.
               High yield securities may be more susceptible to real or per-
            ceived adverse economic and competitive industry conditions than
            higher grade securities. The prices of high yield securities have
            been found to be less sensitive to interest rate changes than more
            highly rated investments, but more sensitive to adverse economic
            downturns or individual corporate developments. A projection of an
            economic downturn or of a period of rising interest rates, for ex-
            ample, could cause a decline in high yield security prices because
            the advent of a recession could lessen the ability of a highly
 
20
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            leveraged company to make principal and interest payments on its
            debt securities. If the issuer of high yield securities defaults,
            a Fund may incur additional expenses to seek recovery. In the case
            of high yield securities structured as zero coupon or payment-in-
            kind securities, the market prices of such securities are affected
            to a greater extent by interest rate changes, and therefore tend
            to be more volatile than securities which pay interest periodi-
            cally and in cash.
               The secondary markets on which high yield securities are traded
            may be less liquid than the market for higher grade securities.
            Less liquidity in the secondary trading markets could adversely
            affect and cause large fluctuations in the daily net asset value
            of a Fund's shares. Adverse publicity and investor perceptions,
            whether or not based on fundamental analysis, may decrease the
            values and liquidity of high yield securities, especially in a
            thinly traded market.
               
               The use of credit ratings as the sole method of evaluating high
            yield securities can involve certain risks. For example, credit
            ratings evaluate the safety of principal and interest payments,
            not the market value risk of high yield securities. Also, credit
            rating agencies may fail to change credit ratings in a timely
            fashion to reflect events since the security was last rated. The
            Adviser does not rely solely on credit ratings when selecting se-
            curities for the Funds, and develops its own independent analysis
            of issuer credit quality. If a credit rating agency changes the
            rating of a portfolio security held by a Fund, the Fund may retain
            the portfolio security if the Adviser deems it in the best inter-
            est of shareholders.     
               
               During the year ended March 31, 1998, based upon the dollar-
            weighted average ratings of the Funds' portfolio holdings at the
            end of each month in the Funds' fiscal year, each operational Fund
            that may invest greater than 5% of its assets in securities rated
            below investment grade had the following percentages of its net
            assets invested in securities rated in the categories indicated as
            rated by Moody's (or, if unrated, determined by the Adviser to be
            of comparable quality). See "Appendix B--Description of Securities
            Ratings," for further information.     
 
 
              FIXED INCOME SECURITIES RATINGS
<TABLE>   
<CAPTION>
                                                       BELOW
           FUND                PRIME 1 AAA  AA    A   PRIME 1 BAA  BA    B
              --------------------------------------------------------------
           <S>                 <C>     <C>  <C>  <C>  <C>     <C>  <C>  <C>
           SHORT-TERM             17%   35%   2%  15%    16%    9%   6%   0%
              --------------------------------------------------------------
           LOW DURATION            6    75    1    1      5     7    5    0
              --------------------------------------------------------------
           TOTAL RETURN           20    47    0   13      6     8    6    0
              --------------------------------------------------------------
           HIGH YIELD              5     2    0    0      2     6   43   42
              --------------------------------------------------------------
           FOREIGN BOND           54    31    4    2      1     2    6    0
              --------------------------------------------------------------
           STRATEGIC BALANCED     17    58    1    9      4     2    9    0
              --------------------------------------------------------------
           STOCKSPLUS             26    38    1   10     11     7    7    0
</TABLE>    
               
               These figures are intended solely to provide disclosure about
            each Fund's asset composition during its most recent fiscal year.
            The asset composition after this time may or may not be approxi-
            mately the same as represented by such figures. In addition, the
            categories reflect ratings by Moody's, and ratings assigned by S&P
            may not be consistent with ratings assigned by Moody's or other
            credit ratings services, and the Adviser may not necessarily agree
            with a rating assigned by any credit rating agency.     
 
 
DERIVATIVE     
INSTRUMENTS To the extent permitted by the investment objectives and policies
            of the Funds, the Funds may purchase and write call and put op-
            tions on securities, securities indexes and foreign currencies,
            and enter into futures contracts and use options on futures con-
            tracts as further described below. The Funds (except the Municipal
            Bond Fund) also may enter into swap agreements with respect to
            foreign currencies, interest rates, and securities indexes. The
            Funds may use these techniques to hedge against changes in inter-
            est rates, foreign currency exchange rates or securities prices or
            as part of their overall investment strategies. The Funds (except
            the Municipal Bond Fund) may also purchase and sell options relat-
            ing to foreign currencies for purposes of increasing exposure to a
            foreign currency or to shift exposure to foreign currency fluctua-
            tions from one country to another. Each Fund will segregate assets
            determined to be liquid by the Adviser in accordance with proce-
            dures established by the Board of Trustees (or, as permitted by
            applicable regulation, enter into certain offsetting positions) to
            cover its obligations under options, futures, and swaps to limit
            leveraging of the Fund.     
                                                     August 1, 1998 Prospectus
                                                                              21
<PAGE>
 
               
               Derivative instruments are considered for these purposes to
            consist of securities or other instruments whose value is derived
            from or related to the value of some other instrument or asset,
            and not to include those securities whose payment of principal
            and/or interest depends upon cash flows from underlying assets,
            such as mortgage-related or asset-backed securities. Each Fund
            (except the Municipal Bond Fund) may invest all of its assets in
            derivative instruments, subject only to the Fund's investment ob-
            jective and policies. The value of some derivative instruments in
            which the Funds invest may be particularly sensitive to changes in
            prevailing interest rates, and, like the other investments of the
            Funds, the ability of a Fund to successfully utilize these instru-
            ments may depend in part upon the ability of the Adviser to fore-
            cast interest rates and other economic factors correctly. If the
            Adviser incorrectly forecasts such factors and has taken positions
            in derivative instruments contrary to prevailing market trends,
            the Funds could be exposed to the risk of loss.     
               
               The Funds might not employ any of the strategies described be-
            low, and no assurance can be given that any strategy used will
            succeed. If the Adviser incorrectly forecasts interest rates, mar-
            ket values or other economic factors in utilizing a derivatives
            strategy for a Fund, the Fund might have been in a better position
            if it had not entered into the transaction at all. The use of
            these strategies involves certain special risks, including a pos-
            sible imperfect correlation, or even no correlation, between price
            movements of derivative instruments and price movements of related
            investments. While some strategies involving derivative instru-
            ments can reduce the risk of loss, they can also reduce the oppor-
            tunity for gain or even result in losses by offsetting favorable
            price movements in related investments or otherwise, due to the
            possible inability of a Fund to purchase or sell a portfolio secu-
            rity at a time that otherwise would be favorable or the possible
            need to sell a portfolio security at a disadvantageous time be-
            cause the Fund is required to maintain asset coverage or offset-
            ting positions in connection with transactions in derivative in-
            struments, and the possible inability of a Fund to close out or to
            liquidate its derivatives positions.     
 
            OPTIONS ON SECURITIES, SECURITIES INDEXES, AND CURRENCIES A Fund
            may purchase put options on securities and indexes. One purpose of
            purchasing put options is to protect holdings in an underlying or
            related security against a substantial decline in market value. A
            Fund may also purchase call options on securities and indexes. One
            purpose of purchasing call options is to protect against substan-
            tial increases in prices of securities the Fund intends to pur-
            chase pending its ability to invest in such securities in an or-
            derly manner. An option on a security (or index) is a contract
            that gives the holder of the option, in return for a premium, the
            right to buy from (in the case of a call) or sell to (in the case
            of a put) the writer of the option the security underlying the op-
            tion (or the cash value of the index) at a specified exercise
            price at any time during the term of the option. The writer of an
            option on a security has the obligation upon exercise of the op-
            tion to deliver the underlying security upon payment of the exer-
            cise price or to pay the exercise price upon delivery of the un-
            derlying security. Upon exercise, the writer of an option on an
            index is obligated to pay the difference between the cash value of
            the index and the exercise price multiplied by the specified mul-
            tiplier for the index option. An index is designed to reflect
            specified facets of a particular financial or securities market, a
            specific group of financial instruments or securities, or certain
            economic indicators.
               A Fund may sell put or call options it has previously pur-
            chased, which could result in a net gain or loss depending on
            whether the amount realized on the sale is more or less than the
            premium and other transaction costs paid on the put or call option
            which is sold. A Fund may write a call or put option only if the
            option is "covered" by the Fund holding a position in the under-
            lying securities or by other means which would permit immediate
            satisfaction of the Fund's obligation as writer of the option.
            Prior to exercise or expiration, an option may be closed out by an
            offsetting purchase or sale of an option of the same series.
               The Funds may write covered straddles consisting of a combina-
            tion of a call and a put written on the same underlying security.
            A straddle will be covered when sufficient assets are deposited to
            meet the Funds' immediate obligations. The Funds may use the same
            liquid assets to cover both the call and put options where the ex-
            ercise price of the call and put are the same, or the exercise
            price of the call is higher than that of the put. In such cases,
            the Funds will also segregate liquid assets equivalent to the
            amount, if any, by which the put is "in the money."
 
22
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               The purchase and writing of options involves certain risks.
            During the option period, the covered call writer has, in return
            for the premium on the option, given up the opportunity to profit
            from a price increase in the underlying security above the exer-
            cise price, but, as long as its obligation as a writer continues,
            has retained the risk of loss should the price of the underlying
            security decline. The writer of an option has no control over the
            time when it may be required to fulfill its obligation as a writer
            of the option. Once an option writer has received an exercise no-
            tice, it cannot effect a closing purchase transaction in order to
            terminate its obligation under the option and must deliver the un-
            derlying security at the exercise price. If a put or call option
            purchased by the Fund is not sold when it has remaining value, and
            if the market price of the underlying security remains equal to or
            greater than the exercise price (in the case of a put), or remains
            less than or equal to the exercise price (in the case of a call),
            the Fund will lose its entire investment in the option. Also,
            where a put or call option on a particular security is purchased
            to hedge against price movements in a related security, the price
            of the put or call option may move more or less than the price of
            the related security. There can be no assurance that a liquid mar-
            ket will exist when a Fund seeks to close out an option position.
            Furthermore, if trading restrictions or suspensions are imposed on
            the options markets, a Fund may be unable to close out a position.
               Funds that invest in foreign currency-denominated securities
            may buy or sell put and call options on foreign currencies. Cur-
            rency options traded on U.S. or other exchanges may be subject to
            position limits which may limit the ability of a Fund to reduce
            foreign currency risk using such options.
               Over-the-counter options in which certain Funds may invest dif-
            fer from traded options in that they are two-party contracts, with
            price and other terms negotiated between buyer and seller, and
            generally do not have as much market liquidity as exchange-traded
            options. The Funds may be required to treat as illiquid over-the-
            counter options purchased and securities being used to cover cer-
            tain written over-the-counter options.
 
            SWAP AGREEMENTS The Funds (except the Municipal Bond Fund) may en-
            ter into interest rate, index, equity and currency exchange rate
            swap agreements. These transactions would be entered into in an
            attempt to obtain a particular return when it is considered desir-
            able to do so, possibly at a lower cost to the Fund than if the
            Fund had invested directly in the asset that yielded the desired
            return. Swap agreements are two-party contracts entered into pri-
            marily by institutional investors for periods ranging from a few
            weeks to more than one year. In a standard swap transaction, two
            parties agree to exchange the returns (or differentials in rates
            of return) earned or realized on particular predetermined invest-
            ments or instruments, which may be adjusted for an interest fac-
            tor. The gross returns to be exchanged or "swapped" between the
            parties are generally calculated with respect to a "notional
            amount," i.e., the return on or increase in value of a particular
            dollar amount invested at a particular interest rate, in a partic-
            ular foreign currency, or in a "basket" of securities representing
            a particular index. Forms of swap agreements include interest rate
            caps, under which, in return for a premium, one party agrees to
            make payments to the other to the extent that interest rates ex-
            ceed a specified rate, or "cap"; interest rate floors, under
            which, in return for a premium, one party agrees to make payments
            to the other to the extent that interest rates fall below a speci-
            fied level, or "floor"; and interest rate collars, under which a
            party sells a cap and purchases a floor or vice versa in an at-
            tempt to protect itself against interest rate movements exceeding
            given minimum or maximum levels.
               
               Most swap agreements entered into by the Funds calculate the
            obligations of the parties to the agreement on a "net basis." Con-
            sequently, a Fund's current obligations (or rights) under a swap
            agreement will generally be equal only to the net amount to be
            paid or received under the agreement based on the relative values
            of the positions held by each party to the agreement (the "net
            amount"). A Fund's current obligations under a swap agreement will
            be accrued daily (offset against amounts owed to the Fund), and
            any accrued but unpaid net amounts owed to a swap counterparty
            will be covered by the segregation of assets determined to be liq-
            uid by the Adviser in accordance with procedures established by
            the Board of Trustees, to limit any potential leveraging of the
            Fund's portfolio. Obligations under swap agreements so covered
            will not be construed to be "senior securities" for purposes of
            the Funds' investment restriction concerning senior securities. A
            Fund will not enter into a swap agreement with any single party if
            the net amount owed or to be received under existing contracts
            with that party would exceed 5% of the Fund's assets.     
 
                                                                             23
                                                    August 1, 1998 Prospectus
<PAGE>
 
               
               Whether a Fund's use of swap agreements will be successful in
            furthering its investment objective will depend on the Adviser's
            ability to predict correctly whether certain types of investments
            are likely to produce greater returns than other investments. Be-
            cause they are two-party contracts and because they may have terms
            of greater than seven days, swap agreements may be considered to
            be illiquid investments. Moreover, a Fund bears the risk of loss
            of the amount expected to be received under a swap agreement in
            the event of the default or bankruptcy of a swap agreement
            counterparty. The Funds will enter into swap agreements only with
            counterparties that meet certain standards for creditworthiness
            (generally, such counterparties would have to be eligible
            counterparties under the terms of the Funds' repurchase agreement
            guidelines). Certain restrictions imposed on the Funds by the In-
            ternal Revenue Code may limit the Funds' ability to use swap
            agreements. The swaps market is a relatively new market and is
            largely unregulated. It is possible that developments in the swaps
            market, including potential government regulation, could adversely
            affect a Fund's ability to terminate existing swap agreements or
            to realize amounts to be received under such agreements.     
 
            FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS Each of the
            Fixed Income Funds (except the Municipal Bond Fund) may invest in
            interest rate futures contracts and options thereon ("futures op-
            tions"), and to the extent it may invest in foreign currency-de-
            nominated securities, may also invest in foreign currency futures
            contracts and options thereon. The Municipal Bond Fund may pur-
            chase and sell futures contracts on U.S. Government securities and
            Municipal Bonds, as well as purchase put and call options on such
            futures contracts. The StocksPLUS Fund may invest in interest
            rate, stock index and foreign currency futures contracts and op-
            tions thereon.
               There are several risks associated with the use of futures and
            futures options for hedging purposes. There can be no guarantee
            that there will be a correlation between price movements in the
            hedging vehicle and in the portfolio securities being hedged. An
            incorrect correlation could result in a loss on both the hedged
            securities in a Fund and the hedging vehicle, so that the portfo-
            lio return might have been greater had hedging not been attempted.
            There can be no assurance that a liquid market will exist at a
            time when a Fund seeks to close out a futures contract or a
            futures option position. Most futures exchanges and boards of
            trade limit the amount of fluctuation permitted in futures con-
            tract prices during a single day; once the daily limit has been
            reached on a particular contract, no trades may be made that day
            at a price beyond that limit. In addition, certain of these in-
            struments are relatively new and without a significant trading
            history. As a result, there is no assurance that an active second-
            ary market will develop or continue to exist. Lack of a liquid
            market for any reason may prevent a Fund from liquidating an unfa-
            vorable position, and the Fund would remain obligated to meet mar-
            gin requirements until the position is closed.
               The Funds may write covered straddles consisting of a call and
            a put written on the same underlying futures contract. A straddle
            will be covered when sufficient assets are deposited to meet the
            Funds' immediate obligations. A Fund may use the same liquid as-
            sets to cover both the call and put options where the exercise
            price of the call and put are the same, or the exercise price of
            the call is higher than that of the put. In such cases, the Funds
            will also segregate liquid assets equivalent to the amount, if
            any, by which the put is "in the money."
               The Funds will only enter into futures contracts or futures op-
            tions which are standardized and traded on a U.S. or foreign ex-
            change or board of trade, or similar entity, or quoted on an auto-
            mated quotation system. Each Fund will use financial futures con-
            tracts and related options only for "bona fide hedging" purposes,
            as such term is defined in applicable regulations of the CFTC or,
            with respect to positions in financial futures and related options
            that do not qualify as "bona fide hedging" positions, will enter
            such positions only to the extent that aggregate initial margin
            deposits plus premiums paid by it for open futures option posi-
            tions, less the amount by which any such positions are "in-the-
            money," would not exceed 5% of the Fund's net assets.
 
 
HYBRID
INSTRUMENTS
            A hybrid instrument can combine the characteristics of securities,
            futures, and options. For example, the principal amount or inter-
            est rate of a hybrid could be tied (positively or negatively) to
            the price of some commodity, currency or securities index or an-
            other interest rate (each a "benchmark"). The interest rate or
            (unlike most fixed income securi-
 
24
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            ties) the principal amount payable at maturity of a hybrid secu-
            rity may be increased or decreased, depending on changes in the
            value of the benchmark.
               Hybrids can be used as an efficient means of pursuing a variety
            of investment goals, including currency hedging, duration manage-
            ment, and increased total return. Hybrids may not bear interest or
            pay dividends. The value of a hybrid or its interest rate may be a
            multiple of a benchmark and, as a result, may be leveraged and
            move (up or down) more steeply and rapidly than the benchmark.
            These benchmarks may be sensitive to economic and political
            events, such as commodity shortages and currency devaluations,
            which cannot be readily foreseen by the purchaser of a hybrid. Un-
            der certain conditions, the redemption value of a hybrid could be
            zero. Thus, an investment in a hybrid may entail significant mar-
            ket risks that are not associated with a similar investment in a
            traditional, U.S. dollar-denominated bond that has a fixed princi-
            pal amount and pays a fixed rate or floating rate of interest. The
            purchase of hybrids also exposes a Fund to the credit risk of the
            issuer of the hybrids. These risks may cause significant fluctua-
            tions in the net asset value of the Fund. Accordingly, no Fund
            will invest more than 5% of its assets in hybrid instruments.
               Certain issuers of structured products such as hybrid instru-
            ments may be deemed to be investment companies as defined in the
            1940 Act. As a result, the Funds' investments in these products
            will be subject to limits applicable to investments in investment
            companies and may be subject to restrictions contained in the 1940
            Act.
           
CATASTROPHE Each of the Fixed Income Funds and the StocksPLUS Fund may invest
BONDS       in "catastrophe bonds." Catastrophe bonds are fixed income securi-
            ties, for which the return of principal and payment of interest is
            contingent on the non-occurrence of a specific "trigger" cata-
            strophic event, such as a hurricane or an earthquake. They may be
            issued by government agencies, insurance companies, reinsurers,
            special purpose corporations or other on-shore or off-shore enti-
            ties. If a trigger event causes losses exceeding a specific amount
            in the geographic region and time period specified in a bond, a
            Fund investing in the bond may lose a portion or all of its prin-
            cipal invested in the bond. If no trigger event occurs, the Fund
            will recover its principal plus interest. For some catastrophe
            bonds, the trigger event or losses may be based on companywide
            losses, index-portfolio losses, industry indices, or readings of
            scientific instruments rather than specified actual losses. Often
            the catastrophe bonds provide for extensions of maturity that are
            mandatory, or optional at the discretion of the issuer, in order
            to process and audit loss claims in those cases where a trigger
            event has, or possibly has, occurred. In addition to the specified
            trigger events, catastrophe bonds may also expose the Fund to cer-
            tain unanticipated risks including but not limited to issuer
            (credit) default, adverse regulatory or jurisdictional interpreta-
            tions, and adverse tax consequences.     
               
               Catastrophe bonds are a relatively new type of financial in-
            strument. As such, there is no significant trading history of
            these securities, and there can be no assurance that a liquid mar-
            ket in these instruments will develop. See "Illiquid Securities"
            below. Lack of a liquid market may impose the risk of higher
            transaction costs and the possibility that a Fund may be forced to
            liquidate positions when it would not be advantageous to do so.
            Catastrophe bonds are typically rated, and a Fund will only invest
            in catastrophe bonds that meet the credit quality requirements for
            the Fund.     
 
 
INVESTMENT  Each of the Funds may invest in securities of other investment
IN          companies, such as closed-end management investment companies, or
INVESTMENT  in pooled accounts or other investment vehicles. As a shareholder
COMPANIES   of an investment company, a Fund may indirectly bear service and
            other fees which are in addition to the fees the Fund pays its
            service providers.
 
 
PORTFOLIO
TURNOVER
               
            The length of time a Fund has held a particular security is not
            generally a consideration in investment decisions. The investment
            policies of a Fund may lead to frequent changes in the Fund's in-
            vestments, particularly in periods of volatile market movements.
            High portfolio turnover (e.g., over 100%) involves correspondingly
            greater expenses to a Fund, including commissions or dealer mark-
            ups and other transaction costs on the sale of securities and
            reinvestments in other securities. See "Management of the Trust--
            Portfolio Transactions." Such sales may result in realization of
            taxable capital gains. See "Taxes." The portfolio turnover rate
            for the following Funds for the last two fiscal years (1998 and
            1997, respectively) was: Short-Term--48% and 77%; Low Duration--
            309% and 240%; Total Return--206% and 173%; High Yield--37% and
            67%; and Foreign Bond--280% and 984%.     
                                                     August 1, 1998 Prospectus
                                                                              25
<PAGE>
 
 
 
ILLIQUID       
SECURITIES  Each of the Funds may invest up to 15% of its net assets in illiq-
            uid securities. Certain illiquid securities may require pricing at
            fair value as determined in good faith under the supervision of
            the Board of Trustees. The Adviser may be subject to significant
            delays in disposing of illiquid securities, and transactions in
            illiquid securities may entail registration expenses and other
            transaction costs that are higher than those for transactions in
            liquid securities. The term "illiquid securities" for this purpose
            means securities that cannot be disposed of within seven days in
            the ordinary course of business at approximately the amount at
            which a Fund has valued the securities. Illiquid securities are
            considered to include, among other things, written over-the-
            counter options, securities or other liquid assets being used as
            cover for such options, repurchase agreements with maturities in
            excess of seven days, certain loan participation interests, fixed
            time deposits which are not subject to prepayment or provide for
            withdrawal penalties upon prepayment (other than overnight depos-
            its), securities that are subject to legal or contractual restric-
            tions on resale and other securities which legally or in the Ad-
            viser's opinion may be deemed illiquid (not including securities
            issued pursuant to Rule 144A under the Securities Act of 1933 and
            certain commercial paper that Pacific Investment Management has
            determined to be liquid under procedures approved by the Board of
            Trustees).     
               Illiquid securities may include privately placed securities,
            which are sold directly to a small number of investors, usually
            institutions. Unlike public offerings, such securities are not
            registered under the federal securities laws. Although certain of
            these securities may be readily sold, for example, under Rule
            144A, others may be illiquid, and their sale may involve substan-
            tial delays and additional costs.
 
SERVICE        
SYSTEMS--   Many of the services provided to the Funds depend on the smooth
YEAR 2000   functioning of computer systems. Many systems in use today cannot
PROBLEM     distinguish between the year 1900 and the year 2000. Should any of
            the service systems fail to process information properly, that
            could have an adverse impact on the Funds' operations and services
            provided to shareholders. The Adviser, Distributor, Shareholder
            Servicing and Transfer Agent, Custodian, and certain other service
            providers to the Funds have reported that each is working toward
            mitigating the risks associated with the so-called "year 2000
            problem." However, there can be no assurance that the problem will
            be corrected in all respects and that the Funds' operations and
            services provided to shareholders will not be adversely affected.
                
            Performance Information
 
            From time to time the Trust may make available certain information
            about the performance of the Class D shares of some or all of the
            Funds. Information about a Fund's performance is based on that
            Fund's (or its predecessor's) record to a recent date and is not
            intended to indicate future performance.
               From time to time, the yield and total return for each class of
            shares of the Funds may be included in advertisements or reports
            to shareholders or prospective investors. Quotations of yield for
            a Fund or class will be based on the investment income per share
            (as defined by the Securities and Exchange Commission) during a
            particular 30-day (or one-month) period (including dividends and
            interest), less expenses accrued during the period ("net invest-
            ment income"), and will be computed by dividing net investment in-
            come by the maximum public offering price per share on the last
            day of the period. The tax equivalent yield of the Municipal Bond
            Fund's Class D shares may also be advertised, calculated like
            yield except that, for any given tax bracket, net investment in-
            come will be calculated as the sum of (i) any taxable income of
            the class plus (ii) the tax exempt income of the class divided by
            the difference between 1 and the effective federal income tax
            rates for taxpayers in that tax bracket.
               
               The total return of Class D shares of all Funds may be included
            in advertisements or other written material. When a Fund's total
            return is advertised with respect to its Class D shares, it will
            be calculated for the past year, the past five years, and the past
            ten years (or if the Fund has been offered for a period shorter
            than one, five or ten years, that period will be substituted)
            since the establishment of the Fund, as more fully described in
            the Statement of Additional Information. For periods prior to the
            initial offering date of Class D shares, total return presenta-
            tions for the Class D     
 
26
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            shares will be based on the historical performance of an older
            class of the Fund (if any) restated, as necessary, to reflect that
            there are no sales charges associated with Class D shares. The
            older class to be used in each case is set forth in the Statement
            of Additional Information. For these purposes, the performance of
            the older class will also be restated to reflect any different op-
            erating expenses (such as different administrative fees and/or
            12b-1/servicing fee charges) associated with Class D shares. In
            certain cases, such a restatement will result in Class D perfor-
            mance which is higher than if the performance of the older class
            were not restated to reflect the different Class D operating ex-
            penses. In such cases, the Trust's advertisements will also, to
            the extent appropriate, show the lower performance figure reflect-
            ing the actual operating expenses incurred by the older class for
            periods prior to the initial offering date of Class D shares.
            Total return is measured by comparing the value of an investment
            in Class D shares of the Fund at the beginning of the relevant pe-
            riod to the redemption value of the investment in the Fund at the
            end of the period (assuming immediate reinvestment of any divi-
            dends or capital gains distributions at net asset value). Total
            return may be advertised using alternative methods that reflect
            all elements of return, but that may be adjusted to reflect the
            cumulative impact of alternative fee and expense structures, such
            as the currently effective advisory and administrative fees for
            Class D shares of the Funds.     
               The Funds may also provide current distribution information to
            its shareholders in shareholder reports or other shareholder com-
            munications, or in certain types of sales literature provided to
            prospective investors. Current distribution information for a
            Class D shares of a Fund will be based on distributions for a
            specified period (i.e., total dividends from net investment in-
            come), divided by the net asset value per Class D share on the
            last day of the period and annualized. The rate of current distri-
            butions does not reflect deductions for unrealized losses from
            transactions in derivative instruments such as options and
            futures, which may reduce total return. Current distribution rates
            differ from standardized yield rates in that they represent what
            Class D shares of a Fund have declared and paid to shareholders as
            of the end of a specified period rather than the Fund's actual net
            investment income for that period.
               
               Performance information for the Trust may also be compared to
            various unmanaged indexes, such as the S&P 500, the Lehman Broth-
            ers Aggregate Bond Index, the Lehman Brothers Mortgage-Backed Se-
            curities Index, the Merrill Lynch 1 to 3 Year Treasury Index, the
            Lehman Intermediate and 20+ Year Treasury Blend Index, the Lehman
            Inflation Linked Treasury Index, the Lehman Municipal Bond Index,
            the Lehman BB Intermediate Corporate Index, indexes prepared by
            Lipper Analytical Services, the J.P. Morgan Global Index, the J.P.
            Morgan Emerging Markets Bond Index Plus, the Salomon Brothers
            World Government Bond Index-10 Non U.S.-Dollar Hedged and the J.P.
            Morgan Government Bond Index Non U.S.-Dollar Hedged, and other en-
            tities or organizations which track the performance of investment
            companies or investment advisers. Unmanaged indexes (i.e., other
            than Lipper) generally do not reflect deductions for administra-
            tive and management costs and expenses. The Adviser may also re-
            port to shareholders or to the public in advertisements concerning
            the performance of the Adviser as adviser to clients other than
            the Trust, and on the comparative performance or standing of the
            Adviser in relation to other money managers. Such comparative in-
            formation may be compiled or provided by independent ratings serv-
            ices or by news organizations. Any performance information,
            whether related to the Funds or to the Adviser, should be consid-
            ered in light of the Funds' investment objectives and policies,
            characteristics and quality of the portfolio, and the market con-
            ditions during the time period indicated, and should not be con-
            sidered to be representative of what may be achieved in the fu-
            ture. For a description of the methods used to determine yield and
            total return for the Funds, see the Statement of Additional Infor-
            mation.     
               Investment results of the Funds will fluctuate over time, and
            any presentation of the Funds' total return or yield for any prior
            period should not be considered as a representation of what an in-
            vestor's total return or yield may be in any future period.
                                                     August 1, 1998 Prospectus
                                                                              27
<PAGE>
 
 
            How to Buy Shares
 
            Class D shares of each Fund are continuously offered through fi-
            nancial service firms, such as broker-dealers or registered in-
            vestment advisers, with which the Trust's principal underwriter,
            PIMCO Funds Distributors LLC (the "Distributor"), has an agreement
            for the use of the Funds in particular investment products, pro-
            grams or accounts for which a fee may be charged. See "Financial
            Service Firms" below.
               You may purchase Class D shares only through your financial
            service firm. In connection with purchases, your financial service
            firm is responsible for forwarding all necessary documentation to
            the Distributor, and may charge you for such services. Investors
            who wish to purchase shares of the Funds directly from the Trust
            or the Distributor should inquire as to the other classes of
            shares. See "Description of the Trust--Multiple Classes of
            Shares."
               Class D shares may be purchased at a price equal to their net
            asset value per share next determined after receipt of an order.
            Purchase payments for Class D shares are fully invested at the net
            asset value next determined after acceptance of the trade. All
            purchase orders received by the Distributor from your financial
            service firm prior to the close of regular trading (normally 4:00
            p.m., Eastern time) on the New York Stock Exchange (the "Ex-
            change"), on a regular business day, are processed at that day's
            offering price. In addition, orders received by the Distributor
            from financial service firms after the offering price is deter-
            mined that day will receive such offering price if the orders were
            received by the firm from its customer prior to such determination
            and were transmitted to and received by the Distributor prior to
            its close of business that day (normally 7:00 p.m., Eastern time).
            Purchase orders received on other than a regular business day will
            be executed on the next succeeding regular business day.
               The Distributor, in its sole discretion, may accept or reject
            any order for purchase of Fund shares. The sale of shares will be
            suspended during any period in which the Exchange is closed for
            other than weekends or holidays, or if permitted by the rules of
            the Securities and Exchange Commission, when trading on the Ex-
            change is restricted or during an emergency which makes it imprac-
            ticable for the Funds to dispose of their securities or to deter-
            mine fairly the value of their net assets, or during any other pe-
            riod as permitted by the Securities and Exchange Commission for
            the protection of investors.
               Class D shares of the Funds will be held in your account with
            your financial service firm and, generally, your firm will hold
            your Class D shares in nominee or street name as your agent. Ac-
            cordingly, in most cases, the Trust's transfer agent will have no
            information with respect to or control over accounts of specific
            Class D shareholders and you may obtain information about your ac-
            counts only through your financial service firm. In certain cir-
            cumstances, your firm may arrange to have your shares held in your
            own name or you may subsequently become a holder of record for
            some other reason (for instance, if you terminate your relation-
            ship with your firm). In such circumstances, please contact the
            Distributor at 888-87-PIMCO for information about your account. If
            you wish to invest in the Funds through your own account with the
            Trust or the Distributor, please inquire as to the other classes
            of shares of the Funds. See "Description of the Trust--Multiple
            Classes of Shares." In the interest of economy and convenience,
            certificates for Class D shares will not be issued.
 
 
FINANCIAL      
SERVICE     Broker-dealers, registered investment advisers and other financial
FIRMS       service firms provide varying investment products, programs or ac-
            counts, pursuant to arrangements with the Distributor, through
            which their clients may purchase and redeem Class D shares of the
            Funds. Firms will generally provide or arrange for the provision
            of some or all of the shareholder servicing and account mainte-
            nance services required by your account, including, without limi-
            tation, transfers of registration and dividend payee changes; and
            may perform functions such as generation of confirmation state-
            ments and disbursement of cash dividends. Firms may also arrange
            with their clients for other investment or administrative servic-
            es. Your firm may independently establish and charge you transac-
            tion fees and/or other additional amounts for such services, which
            charges could reduce your investment returns on Class D shares of
            the Funds.     
               Your financial service firm may have omnibus accounts and simi-
            lar arrangements with the Trust and may be paid for providing sub-
            transfer agency and other services. A firm may be paid for its
            services directly or indirectly by the
 
28
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            Funds, the Adviser or an affiliate (normally not to exceed an an-
            nual rate of 0.35% of a Fund's average daily net assets attribut-
            able to its Class D shares and purchased through such firm for its
            clients). Your firm may establish various minimum investment re-
            quirements for Class D shares of the Funds and may also establish
            certain privileges with respect to purchases, redemptions and ex-
            changes of Class D shares or the reinvestment of dividends.     
               This Prospectus should be read in connection with your firm's
            materials regarding its fees and services.
 
            Exchange Privilege
               
            A shareholder may exchange Class D shares of any Fund for Class D
            shares of any other Fund in an account with identical registration
            on the basis of their respective net asset values. Class D shares
            of each Fund may also be exchanged for Class D shares of certain
            series of PIMCO Funds: Multi-Manager Series, an affiliated mutual
            fund family composed primarily of stock portfolios managed by
            subsidiaries of PIMCO Advisors L.P., an affiliate of the Adviser.
            There are currently no exchange fees or charges imposed by the
            Trust, although your financial service firm may impose various
            fees and charges, investment minimums and other requirements with
            respect to exchanges. Please contact your financial service firm
            for details. An exchange will constitute a taxable sale for
            federal income tax purposes.     
               
               The Trust reserves the right to refuse exchange purchases if,
            in the judgment of the Adviser, the purchase would adversely af-
            fect a Fund and its shareholders. In particular, a pattern of ex-
            changes characteristic of "market-timing" strategies may be deemed
            by the Adviser to be detrimental to the Trust or a particular
            Fund. Currently, the Trust limits the number of "round trip" ex-
            changes an investor may make. An investor makes a "round trip" ex-
            change when the investor purchases shares of a particular Fund,
            subsequently exchanges those shares for shares of a different
            Fund, and then exchanges back into the originally purchased Fund.
            The Trust has the right to refuse any exchange for any investor
            who completes (by making the exchange back into shares of the
            originally purchased Fund) more than six round trip exchanges in
            any twelve-month period. Although the Trust has no current inten-
            tion of terminating or modifying the exchange privilege other than
            as set forth in the preceding sentence, it reserves the right to
            do so at any time. Except as otherwise permitted by Securities and
            Exchange Commission regulations, the Trust will give 60 days' ad-
            vance notice to your financial service firm of any termination or
            material modification of the exchange privilege. For further in-
            formation about exchange privileges, please contact your financial
            service firm.     
 
            How to Redeem
 
            Class D shares may be redeemed through your financial service firm
            on any day the Exchange is open. Shares are redeemed at their net
            asset value next determined after a proper redemption request has
            been received from your financial service firm. There is no charge
            by the Trust or the Distributor with respect to a redemption, al-
            though your financial service firm may charge you for its services
            in processing your redemption request. Please contact your finan-
            cial service firm for details. If you are the holder of record of
            your Class D shares, you may contact the Distributor at 888-87-
            PIMCO for information regarding how to redeem your shares directly
            from the Trust.
               Your financial service firm is obligated to transmit your re-
            demption orders to the Distributor promptly and is responsible for
            ensuring that your redemption request is in proper form. Requests
            for redemption received by financial service firms prior to the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            Exchange on a regular business day and received by the Distributor
            prior to the close of the Distributor's business day will be con-
            firmed at the net asset value effective as of the closing of the
            Exchange on that day. Your financial service firm will be respon-
            sible for furnishing all necessary documentation to the Distribu-
            tor or the Trust's transfer agent and may charge you for its serv-
            ices. Redemption proceeds will be forwarded to your financial
            service firm as promptly as possible and in any event within seven
            days after the redemption request is received by the Distributor
            in good order. Under unusual circumstances, the Trust may suspend
            redemptions or postpone payment for more than seven days, as per-
            mitted by federal securities law.
                                                     August 1, 1998 Prospectus
                                                                              29
<PAGE>
 
 
            Distributor
 
            The Distributor, a wholly owned subsidiary of PIMCO Advisors L.P.,
            is the principal underwriter of the Trust's shares. Pursuant to a
            Distribution Contract with the Trust, with respect to each Fund's
            Class D shares, the Distributor bears various promotional and
            sales related expenses, including the cost of printing and mailing
            prospectuses to persons other than current shareholders. The Dis-
            tributor, located at 2187 Atlantic Street, Stamford, Connecticut
            06902, is a broker-dealer registered with the SEC.
 
            How Net Asset Value Is Determined
               
            The net asset value of Class D shares of each Fund will be deter-
            mined once on each day on which the Exchange is open as of the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            Exchange. Net asset value will not be determined on days on which
            the Exchange is closed.     
               For all Funds, portfolio securities and other assets for which
            market quotations are readily available are stated at market. Mar-
            ket value is determined on the basis of last reported sales pric-
            es, or if no sales are reported, as is the case for most securi-
            ties traded over-the-counter, at the mean between representative
            bid and asked quotations obtained from a quotation reporting sys-
            tem or from established market makers. Fixed income securities,
            including those to be purchased under firm commitment agreements
            (other than obligations having a maturity of 60 days or less), are
            normally valued on the basis of quotations obtained from brokers
            and dealers or pricing services, which take into account appropri-
            ate factors such as institutional-sized trading in similar groups
            of securities, yield, quality, coupon rate, maturity, type of is-
            sue, trading characteristics, and other market data.
               Quotations of foreign securities in foreign currency are con-
            verted to U.S. dollar equivalents using foreign exchange quota-
            tions received from independent dealers. Short-term investments
            having a maturity of 60 days or less are valued at amortized cost,
            when the Board of Trustees determines that amortized cost is their
            fair value. Certain fixed income securities for which daily market
            quotations are not readily available may be valued, pursuant to
            guidelines established by the Board of Trustees, with reference to
            fixed income securities whose prices are more readily obtainable
            and whose durations are comparable to the securities being valued.
            Subject to the foregoing, other securities for which market quota-
            tions are not readily available are valued at fair value as deter-
            mined in good faith by the Board of Trustees.
               Each Fund's liabilities are allocated among its classes. The
            total of such liabilities allocated to a class plus that class's
            distribution and/or servicing fees and any other expenses spe-
            cially allocated to that class are then deducted from the class's
            proportionate interest in the Fund's assets, and the resulting
            amount for each class is divided by the number of shares of that
            class outstanding to produce the class's "net asset value" per
            share. Generally, for Funds that pay income dividends, those divi-
            dends are expected to differ over time by approximately the amount
            of the expense accrual differential between a particular Fund's
            classes.
 
            Distributions
 
            Each Fund pays out as dividends substantially all of its net in-
            vestment income (which comes from dividends and interest it re-
            ceives or is deemed to receive from its investments) and net real-
            ized short-term capital gains. For these purposes and for federal
            income tax purposes, a portion of the premiums from certain ex-
            pired call or put options written by the Fund, net gains from
            closing purchase and sale transactions with respect to such op-
            tions, and net gains from futures transactions are treated as
            short-term capital gains. Each Fund distributes substantially all
            of its net realized capital gains, if any, after giving effect to
            any available capital loss carry-over.
 
30
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               Shares begin earning dividends on the day after the date that
            funds are received by the Trust for the purchase of shares. For
            the Fixed Income Funds, dividends are declared daily from net in-
            vestment income to shareholders of record at the close of the pre-
            vious business day, and distributed to shareholders monthly. The
            StocksPLUS and Strategic Balanced Funds intend to declare and pay
            as a dividend substantially all of their net investment income on
            a quarterly basis. Any net realized capital gains from the sale of
            portfolio securities will be distributed no less frequently than
            once yearly. Dividend and capital gain distributions of a Fund
            will be reinvested in additional shares of that Fund unless the
            shareholder elects to have them paid in cash. There are no sales
            charges on reinvested dividends. If a shareholder has elected to
            receive dividends and/or capital gain distributions in cash and
            the postal or other delivery service is unable to
            deliver checks to the shareholder's address of record, such share-
            holder's distributions will automatically be invested in the Money
            Market Fund until such shareholder is located.
               Your financial service firm may offer a program pursuant to
            which you may elect to invest dividends and/or distributions paid
            by any Fund in shares of the same class of any other Fund of the
            Trust at net asset value. Please contact your financial service
            firm for details.
 
            Taxes
 
            Each Fund intends to qualify as a regulated investment company an-
            nually and to elect to be treated as a regulated investment com-
            pany under the Code. As such, a Fund generally will not pay fed-
            eral income tax on the income and gains it pays as dividends to
            its shareholders. In order to avoid a 4% federal excise tax, each
            Fund intends to distribute each year substantially all of its net
            income and gains.
               Shareholders subject to U.S. federal income tax will be subject
            to tax on dividends received from a Fund, regardless of whether
            received in cash or reinvested in additional shares. Distributions
            received by tax-exempt shareholders generally will not be subject
            to federal income tax to the extent permitted under applicable tax
            law. All shareholders must treat dividends, other than capital
            gain dividends or dividends that represent a return of capital to
            shareholders, as ordinary income.
               
               Dividends designated by a Fund as capital gain dividends de-
            rived from the Fund's net capital gain (that is, the excess of net
            long-term gain over net short-term loss) are taxable to sharehold-
            ers as long-term capital gain except as provided by an applicable
            tax exemption. Any distributions that are not from a Fund's net
            investment income, short-term capital gain, or net capital gain
            may be characterized as a return of capital to shareholders or, in
            some cases, as capital gain. Certain dividends declared in Octo-
            ber, November or December of a calendar year are taxable to share-
            holders (who otherwise are subject to tax on dividends) as though
            received on December 31 of that year if paid to shareholders dur-
            ing January of the following calendar year. Each Fund will advise
            shareholders annually of the amount and nature of the dividends
            paid to them.     
               Dividends paid to shareholders by the Municipal Bond Fund which
            are derived from interest on Municipal Bonds are expected to be
            designated by the Fund as "exempt-interest dividends," and share-
            holders may generally exclude such dividends from gross income for
            federal income tax purposes. However, if a shareholder receives
            social security or railroad retirement benefits, the shareholder
            may be taxed on a portion of those benefits as a result of receiv-
            ing tax- exempt income. In addition, certain exempt-interest divi-
            dends could, as discussed below, cause certain shareholders to be-
            come subject to the alternative minimum tax and may increase the
            alternative minimum tax liability of shareholders already subject
            to this tax.
               To the extent that dividends paid to shareholders by the Munic-
            ipal Bond Fund are derived from taxable interest or from capital
            gains, such dividends will be subject to federal income tax. Any
            gain realized on a redemption of shares will be taxable gain, sub-
            ject to any applicable tax exemption for which an investor may
            qualify.
               
               Dividends derived from interest on certain U.S. Government se-
            curities may be exempt from state and local taxes, although inter-
            est on mortgage-backed U.S. Government securities (for example,
            interest on FNMA and GNMA Certifi     -
                                                     August 1, 1998 Prospectus
                                                                              31
<PAGE>
 
               
            cates) is generally not so exempt. The distributions of "exempt-
            interest dividends" paid by the Municipal Bond Fund may be exempt
            from state and local taxation when received by a shareholder to
            the extent that they are derived from interest on Municipal Bonds
            issued by the state or political subdivision in which such share-
            holder resides. The federal exemption for "exempt-interest divi-
            dends" attributable to Municipal Bonds does not necessarily result
            in exemption of such dividends from income for the purpose of
            state and local taxes. The Trust will report annually on a state-
            by-state basis the source of income the Municipal Bond Fund re-
            ceives on Municipal Bonds that was paid out as dividends during
            the preceding year.     
               The Code also provides that exempt-interest dividends allocable
            to interest received from "private activity bonds" issued after
            August 7, 1986 are an item of tax preference for individual and
            corporate alternative minimum tax at the applicable rate for indi-
            viduals and corporations. Therefore, if the Municipal Bond Fund
            invests in such private activity bonds, certain of its sharehold-
            ers may become subject to the alternative minimum tax on that part
            of its distributions to them that are derived from interest income
            on such bonds, and certain shareholders already subject to such
            tax may have increased liability therefor. However, it is the
            present policy of the Municipal Bond Fund to invest no more than
            20% of its assets in such bonds. Other provisions of the Code af-
            fect the tax treatment of distributions from the Municipal Bond
            Fund for corporations, casualty insurance companies, and financial
            institutions. In particular, under the Code, for corporations, al-
            ternative minimum taxable income will be increased by a percentage
            of the amount by which the corporation's "adjusted current earn-
            ings" (which includes various items of tax exempt income) exceeds
            the amount otherwise determined to be alternative minimum taxable
            income. Accordingly, an investment in the Municipal Bond Fund may
            cause shareholders to be subject to (or result in an increased li-
            ability under) the alternative minimum tax.
               Dividends to shareholders of the Municipal Bond Fund derived
            from money market instruments and U.S. Government securities are
            generally taxable as ordinary income. The Fund may seek to reduce
            fluctuations in its net asset value by engaging in portfolio
            strategies involving options on securities, futures contracts, and
            options on futures contracts. Any gain derived by the Fund from
            the use of such instruments, including by reason of "marking to
            market," will be treated as a combination of short-term and long-
            term capital gain and, if not offset by realized capital losses
            incurred by the Fund, will be distributed to shareholders (possi-
            bly requiring the liquidation of other portfolio securities) and
            will be taxable to shareholders as a combination of ordinary in-
            come and long-term capital gain.
               
               Interest accrued by a Fund from inflation-indexed bonds will be
            includable in the Fund's gross income in the period in which it
            accrues. Periodic adjustments for inflation in the principal value
            of these securities also may give rise to original issue discount,
            which, likewise, will be includable in the Fund's gross income on
            a current basis, regardless of whether the Fund receives any cash
            payments. See "Taxation--Original Issue Discount" in the Statement
            of Additional Information. Amounts includable in a Fund's gross
            income become subject to tax-related distribution requirements.
            Accordingly, a Fund may be required to make annual distributions
            to shareholders in excess of the cash received in a given period
            from these investments. As a result, the Fund may be required to
            liquidate certain investments at a time when it is not advanta-
            geous to do so. If the principal value of an inflation-indexed
            bond is adjusted downward in any period as a result of deflation,
            the reduction may be treated as a loss to the extent the reduction
            exceeds coupon payments received in that period; in that case, the
            amount distributable by the Fund may be reduced and amounts dis-
            tributed previously in the taxable year may be characterized in
            some circumstances as a return of capital.     
               Taxable shareholders should note that the timing of their in-
            vestment could have undesirable tax consequences. If shares are
            purchased on or just before the record date of a dividend, taxable
            shareholders will pay full price for the shares and may receive a
            portion of their investment back as a taxable distribution.
               The preceding discussion relates only to federal income tax;
            the consequences under other tax laws may differ. For additional
            information relating to the tax aspects of investing in a Fund,
            see the Statement of Additional Information.
 
32
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
            Management of the Trust
 
            The business affairs of the Trust are managed under the direction
            of the Board of Trustees. The Trustees are Guilford C. Babcock, R.
            Wesley Burns, Vern O. Curtis, Brent R. Harris, Thomas P. Kemp, and
            William J. Popejoy. Additional information about the Trustees and
            the Trust's executive officers may be found in the Statement of
            Additional Information under the heading "Management--Trustees and
            Officers."
   
INVESTMENT  Pacific Investment Management serves as investment adviser
ADVISER     ("Adviser") to the Funds pursuant to an investment advisory
            contract. The Adviser is an investment management company founded
            in 1971, and had approximately $138 billion in assets under
            management as of June 30, 1998.     
               
               Pacific Investment Management is a subsidiary of PIMCO Advisors
            L.P. ("PIMCO Advisors"). The general partners of PIMCO Advisors
            are PIMCO Partners, G.P. and PIMCO Advisors Holdings L.P. ("PAH").
            PIMCO Partners, G.P. is a general partnership between PIMCO Hold-
            ing LLC, a Delaware limited liability company and an indirect
            wholly-owned subsidiary of Pacific Life Insurance Company, and
            PIMCO Partners LLC, a California limited liability company con-
            trolled by the Managing Directors of Pacific Investment Manage-
            ment. PIMCO Partners, G.P. is the sole general partner of PAH. Pa-
            cific Investment Management's address is 840 Newport Center Drive,
            Suite 300, Newport Beach, California 92660. Pacific Investment
            Management is registered as an investment adviser with the Securi-
            ties and Exchange Commission and as a commodity trading adviser
            with the CFTC.     
               
               The Adviser manages the investment and reinvestment of the as-
            sets of each Fund. The Adviser is responsible for placing orders
            for the purchase and sale of each Fund's investments directly with
            brokers or dealers selected by it in its discretion. See "Portfo-
            lio Transactions" in the Statement of Additional Information.     
               Information about the individual portfolio managers responsible
            for management of the Trust's currently operational Funds offered
            in this Prospectus, including their occupations for the past five
            years, is provided below.
 
<TABLE>   
<CAPTION>
                                      PORTFOLIO MANAGER AND BUSINESS EXPERIENCE
           FUND                       (PAST FIVE YEARS)
              -----------------------------------------------------------------
           <C>                        <S>
           SHORT-TERM FUND            William H. Gross, Managing Director, Pa-
           LOW DURATION FUND          cific Investment Management. A Fixed In-
           TOTAL RETURN FUND          come Portfolio Manager, Mr. Gross is one
           STRATEGIC BALANCED FUND    of the founders of Pacific Investment
           STOCKSPLUS FUND            Management and has managed the Total Re-
                                      turn and Low Duration Funds since their
                                      inception, May 11, 1987. Mr. Gross is the
                                      leader of the team which has managed the
                                      Short-Term, StocksPLUS and Strategic Bal-
                                      anced Funds since January 6, 1998.
              -----------------------------------------------------------------
           REAL RETURN BOND FUND      John Brynjolfsson, Vice President, Pa-
                                      cific Investment Management. A Fixed In-
                                      come Portfolio Manager, Mr. Brynjolfsson
                                      joined Pacific Investment Management in
                                      1989, and has managed the Real Return
                                      Bond Fund since its inception, January
                                      29, 1997.
              -----------------------------------------------------------------
           TOTAL RETURN MORTGAGE FUND Pasi Hamalainen, Executive Vice Presi-
                                      dent, Pacific Investment Management. A
                                      Fixed Income Portfolio Manager, Mr.
                                      Hamalainen joined Pacific Investment Man-
                                      agement in 1994 and has managed the Total
                                      Return Mortgage Fund since its inception,
                                      July 31, 1997.
              -----------------------------------------------------------------
           HIGH YIELD FUND            Benjamin Trosky, Managing Director, Pa-
                                      cific Investment Management. A Fixed In-
                                      come Portfolio Manager, Mr. Trosky joined
                                      Pacific Investment Management in 1990 and
                                      has managed the High Yield Fund since its
                                      inception, December 16, 1992.
              -----------------------------------------------------------------
           MUNICIPAL BOND FUND        Benjamin Ehlert, Executive Vice Presi-
                                      dent, PIMCO. A Fixed Income Portfolio
                                      Manager, Mr. Ehlert has been associated
                                      with PIMCO for over 23 years.
              -----------------------------------------------------------------
           FOREIGN BOND FUND          Lee R. Thomas, III, Managing Director and
                                      Senior International Portfolio Manager,
                                      Pacific Investment Management. A Fixed
                                      Income Portfolio Manager, Mr. Thomas has
                                      managed the Foreign Bond Fund since July
                                      13, 1995. Prior to joining Pacific In-
                                      vestment Management in 1995, Mr. Thomas
                                      was associated with Investcorp as a mem-
                                      ber of the management committee responsi-
                                      ble for global securities and foreign ex-
                                      change trading. Prior to Investcorp, he
                                      was associated with Goldman Sachs as an
                                      Executive Director in foreign fixed in-
                                      come.
</TABLE>    
 
                                                     August 1, 1998 Prospectus
                                                                              33
<PAGE>
 
 
 
FUND
ADMINISTRATOR
            Pacific Investment Management also serves as administrator to the
            Funds' Class D shares pursuant to an administration agreement with
            the Trust. Pacific Investment Management provides administrative
            services for Class D shareholders of the Funds, which include
            clerical help and accounting, bookkeeping, internal audit servic-
            es, and certain other services required by the Funds, preparation
            of reports to the Funds' shareholders and regulatory filings. Pa-
            cific Investment Management may also retain certain of its affili-
            ates to provide certain of these services. In addition, Pacific
            Investment Management, at its own expense, arranges for the provi-
            sion of legal, audit, custody, transfer agency (including sub-
            transfer agency and other administrative services) and other serv-
            ices for the Funds, and is responsible for the costs of registra-
            tion of the Trust's shares and the printing of prospectuses and
            shareholder reports for current shareholders.
               Pacific Investment Management or an affiliate may pay financial
            service firms a portion of the Class D administration fees in re-
            turn for the firms' services (normally not to exceed an annual
            rate of .35% of a Fund's average daily net assets attributable to
            Class D shares purchased through such firms). The Funds' adminis-
            tration agreement includes a plan for Class D shares that has been
            adopted in conformity with the requirements set forth under Rule
            12b-1 of the 1940 Act to allow for the payment of up to .25% per
            annum of the Class D administrative fees for activities that may
            be deemed to be primarily intended to result in the sale of Class
            D shares. The principal types of activities for which such pay-
            ments may be made are services in connection with the distribution
            of Class D shares and/or the provision of shareholder services.
               The Funds (and not Pacific Investment Management) are responsi-
            ble for the following expenses: (i) salaries and other compensa-
            tion of any of the Trust's executive officers and employees who
            are not officers, directors, stockholders or employees of Pacific
            Investment Management or its subsidiaries or affiliates; (ii)
            taxes and governmental fees; (iii) brokerage fees and commissions
            and other portfolio transaction expenses; (iv) the costs of bor-
            rowing money, including interest expenses; (v) fees and expenses
            of the Trustees who are not "interested persons" of Pacific In-
            vestment Management or the Trust, and any counsel retained exclu-
            sively for their benefit; (vi) extraordinary expenses, including
            costs of litigation and indemnification expenses; (vii) expenses,
            such as organizational expenses, which are capitalized in accor-
            dance with generally accepted accounting principles; and (viii)
            any expenses allocated or allocable to a specific class of shares,
            which include servicing fees payable with respect to Class D
            shares, and may include certain other expenses as permitted by the
            Trust's Multi-Class Plan adopted pursuant to Rule 18f-3 under the
            1940 Act, subject to review and approval by the Trustees.
ADVISORY
AND
ADMINISTRATIVE
FEES
            The Funds feature fixed advisory and administrative fee rates. For
            providing investment advisory and administrative services to the
            Funds as described above, Pacific Investment Management receives
            monthly fees from each Fund at an annual rate (i) based on the av-
            erage daily net assets of the Fund for advisory fees and, (ii) at-
            tributable in the aggregate to the Fund's Class D shares for ad-
            ministrative fees, as follows:
 
 
<TABLE>
<CAPTION>
                                                 ADVISORY
           FUND                                  FEE RATE
              -------------------------------------------------
           <S>                                   <C>
           Strategic Balanced and StocksPLUS
            Funds                                .40%
              -------------------------------------------------
           All other Funds                       .25%
 
 
 
<CAPTION>
                                                 ADMINISTRATIVE
           FUND                                  FEE RATE*
              -------------------------------------------------
           <S>                                   <C>
           Foreign Bond Fund                     .70%
              -------------------------------------------------
           Municipal Bond Fund                   .60%
              -------------------------------------------------
           Short-Term, Low Duration and Total
            Return Funds                         .50%
              -------------------------------------------------
           All other Funds                       .65%
</TABLE>
 
            * As described under "Fund Administrator," the administration
            agreement includes a plan adopted in conformity with Rule 12b-1
            which provides for the payment of up to .25% of the Administrative
            Fee Rate as reimbursement for expenses in respect of activities
            that may be deemed to be primarily intended to result in the sale
            of Class D shares. The "Annual Fund Operating Expenses" table on
            page 4 of this Prospectus shows the Administrative Fee Rate under
            two separate columns entitled "Administrative Fee" and "12b-1
            (Service) Fee."
 
34
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
               Both the investment advisory contract and administration agree-
            ment with respect to Class D shares of the Funds may be terminated
            by the Trustees at any time on 60 days' written notice. The in-
            vestment advisory contract may be terminated by Pacific Investment
            Management on 60 days' written notice. Following the expiration of
            the one-year period commencing with the effectiveness of the ad-
            ministration agreement, it may be terminated by Pacific Investment
            Management on 60 days' written notice. Following its initial two-
            year term, the investment advisory contract will continue from
            year to year if approved by the Trustees. Following its initial
            one-year term, the administration agreement with respect to Class
            D shares of the Funds will continue from year-to-year if approved
            by the Trustees.
 
PORTFOLIO      
TRANSACTIONSPursuant to the advisory contract, the Adviser places orders for
            the purchase and sale of portfolio investments for the Funds' ac-
            counts with brokers or dealers selected by it in its discretion.
            In effecting purchases and sales of portfolio securities for the
            account of the Funds, the Adviser will seek the best price and ex-
            ecution of the Funds' orders. In doing so, a Fund may pay higher
            commission rates than the lowest available when the Adviser be-
            lieves it is reasonable to do so in light of the value of the bro-
            kerage and research services provided by the broker effecting the
            transaction.     
               
               The Adviser manages the Funds without regard generally to re-
            strictions on portfolio turnover, except those imposed on its
            ability to engage in short-term trading by provisions of the fed-
            eral tax laws. The use of certain derivative instruments with rel-
            atively short maturities may tend to exaggerate the portfolio
            turnover rate for some of the Funds. Trading in fixed income secu-
            rities does not generally involve the payment of brokerage commis-
            sions, but does involve indirect transaction costs. The use of
            futures contracts may involve the payment of commissions to
            futures commission merchants. The higher the rate of portfolio
            turnover of a Fund, the higher all these transaction costs borne
            by the Fund generally will be. The portfolio turnover rate for
            each Fund for which financial highlights are provided in this Pro-
            spectus is set forth under "Financial Highlights."     
               
               Some securities considered for investments by the Funds may
            also be appropriate for other clients served by the Adviser. If a
            purchase or sale of securities consistent with the investment pol-
            icies of a Fund and one or more of these clients served by the Ad-
            viser is considered at or about the same time, transactions in
            such securities will be allocated among the Fund and clients in a
            manner deemed fair and reasonable by the Adviser. The Adviser may
            aggregate orders for the Funds with simultaneous transactions en-
            tered into on behalf of other clients of the Adviser so long as
            price and transaction expenses are averaged either for that trans-
            action or for the day.     
 
            Description of the Trust
 
CAPITALIZATION 
            The Trust was organized as a Massachusetts business trust on Feb-
            ruary 19, 1987. The Board of Trustees may establish additional
            portfolios in the future. The capitalization of the Trust consists
            solely of an unlimited number of shares of beneficial interest
            with a par value of $0.0001 each. When issued, shares of the Trust
            are fully paid, non-assessable and freely transferable.

               Under Massachusetts law, shareholders could, under certain cir-
            cumstances, be held personally liable for the obligations of the
            Trust. However, the Declaration of Trust disclaims liability of
            the shareholders, Trustees or officers of the Trust for acts or
            obligations of the Trust, which are binding only on the assets and
            property of the Trust, and requires that notice of the disclaimer
            be given in each contract or obligation entered into or executed
            by the Trust or the Trustees. The Declaration of Trust also pro-
            vides for indemnification out of Trust property for all loss and
            expense of any shareholder held personally liable for the obliga-
            tions of the Trust. The risk of a shareholder incurring financial
            loss on account of shareholder liability is limited to circum-
            stances in which such disclaimer is inoperative or the Trust it-
            self is unable to meet its obligations, and thus should be consid-
            ered remote.
 
 
MULTIPLE
CLASSES OF  In addition to Class D shares, each Fund also offers up to five
SHARES      additional classes of shares, Class A, Class B, Class C, Institu-
            tional Class and Administrative Class shares, through separate
            prospectuses. The other classes are subject to different sales
            charges and expense levels than Class D shares, which will affect
            performance accordingly. This Prospectus relates only to the Class
            D shares of the Funds. Unlike Class D shares, which may be pur-
            chased only through financial service firms, the
                                                     August 1, 1998 Prospectus
                                                                              35
<PAGE>
 
            other classes may be purchased directly from the Trust and/or the
            Distributor. Shareholders of a particular class may also receive
            additional services or services different from those received by
            the other classes. To obtain more information about the other
            classes of shares, please call the Distributor at 800-927-4648
            (for Institutional and Administrative Classes) or 800-426-0107
            (for Class A, Class B or Class C).
 
VOTING      Shareholders have the right to vote on the election of Trustees
            and on any and all matters on which the law or the Declaration of
            Trust states they may be entitled to vote. The Trust is not re-
            quired to hold regular annual meetings of Trust shareholders and
            does not intend to do so. Shareholders of a class of shares or
            Fund have separate voting rights with respect to matters that only
            affect that class or Fund. See "Other Information--Voting Rights"
            in the Statement of Additional Information.
               The Declaration of Trust provides that the holders of not less
            than two-thirds of the outstanding shares of the Trust may remove
            a person serving as Trustee either by declaration in writing or at
            a meeting called for such purpose. The Trustees are required to
            call a meeting for the purpose of considering the removal of a
            person serving as Trustee if requested in writing to do so by the
            holders of not less than 10% of the outstanding shares of the
            Trust.
               
               Shares entitle their holders to one vote per share (with pro-
            portionate voting for fractional shares). As of July 7, 1998, the
            following were shareholders of record of at least 25% of the out-
            standing voting securities of the indicated Fund: William Barron
            Hilton, Trustee (Beverly Hills, California) with respect to the
            Short-Term Fund; National Financial Services Corporation (New
            York, New York) with respect to the Real Return Bond Fund; Charles
            Schwab & Co., Inc. (San Francisco, California) with respect to the
            Foreign Bond Fund; and California Community Foundation (Los Ange-
            les, California) with respect to the Strategic Balanced Fund. To
            the extent such shareholders are also the beneficial owners of
            those shares, they may be deemed to control (as that term is de-
            fined in the 1940 Act) the relevant Fund. As used in this Prospec-
            tus, the phrase "vote of a majority of the outstanding shares" of
            a Fund (or the Trust) means the vote of the lesser of: (1) 67% of
            the shares of the Fund (or the Trust) present at a meeting, if the
            holders of more than 50% of the outstanding shares are present in
            person or by proxy; or (2) more than 50% of the outstanding shares
            of the Fund (or the Trust).     
 
36
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Appendix A
            Description of Duration
               
            Duration is a measure of the expected life of a fixed income secu-
            rity that was developed as a more precise alternative to the con-
            cept of "term to maturity." Traditionally, a fixed income
            security's "term to maturity" has been used as a proxy for the
            sensitivity of the security's price to changes in interest rates
            (which is the "interest rate risk" or "volatility" of the securi-
            ty). However, "term to maturity" measures only the time until a
            fixed income security provides its final payment, taking no ac-
            count of the pattern of the security's payments prior to maturity.
            In contrast, duration incorporates a bond's yield, coupon interest
            payments, final maturity and call features into one measure. Dura-
            tion management is one of the fundamental tools used by the Advis-
            er.     
               Duration is a measure of the expected life of a fixed income
            security on a present value basis. Duration takes the length of
            the time intervals between the present time and the time that the
            interest and principal payments are scheduled or, in the case of a
            callable bond, expected to be received, and weights them by the
            present values of the cash to be received at each future point in
            time. For any fixed income security with interest payments occur-
            ring prior to the payment of principal, duration is always less
            than maturity. In general, all other things being equal, the lower
            the stated or coupon rate of interest of a fixed income security,
            the longer the duration of the security; conversely, the higher
            the stated or coupon rate of interest of a fixed income security,
            the shorter the duration of the security.
               Futures, options and options on futures have durations which,
            in general, are closely related to the duration of the securities
            which underlie them. Holding long futures or call option positions
            (backed by a segregated account of cash and cash equivalents) will
            lengthen a Fund's duration by approximately the same amount that
            holding an equivalent amount of the underlying securities would.
               Short futures or put option positions have durations roughly
            equal to the negative duration of the securities that underlie
            these positions, and have the effect of reducing portfolio dura-
            tion by approximately the same amount that selling an equivalent
            amount of the underlying securities would.
               
               There are some situations where even the standard duration cal-
            culation does not properly reflect the interest rate exposure of a
            security. For example, floating and variable rate securities often
            have final maturities of ten or more years; however, their inter-
            est rate exposure corresponds to the frequency of the coupon re-
            set. For inflation-indexed bonds, duration is calculated on the
            basis of modified real duration, which measures price changes of
            inflation-indexed bonds on the basis of changes in real, rather
            than nominal, interest rates. Another example where the interest
            rate exposure is not properly captured by duration is the case of
            mortgage pass-through securities. The stated final maturity of
            such securities is generally 30 years, but current prepayment
            rates are more critical in determining the securities' interest
            rate exposure. Finally, the duration of a fixed income security
            may vary over time in response to changes in interest rates and
            other market factors. In these and other similar situations, the
            Adviser will use more sophisticated analytical techniques that in-
            corporate the anticipated economic life of a security into the de-
            termination of its interest rate exposure.     
 
                                                                             37
                                                     August 1, 1998 Prospectus
<PAGE>
 
 
            Appendix B
            Description of Securities Ratings
               
            Certain of the Funds make use of average portfolio credit quality
            standards to assist institutional investors whose own investment
            guidelines limit their investments accordingly. In determining a
            Fund's overall dollar-weighted average quality, unrated securities
            are treated as if rated, based on the Adviser's view of their com-
            parability to rated securities. A Fund's use of average quality
            criteria is intended to be a guide for those institutional invest-
            ors whose investment guidelines require that assets be invested
            according to comparable criteria. Reference to an overall average
            quality rating for a Fund does not mean that all securities held
            by the Fund will be rated in that category or higher. A Fund's in-
            vestments may range in quality from securities rated in the lowest
            category in which the Fund is permitted to invest to securities
            rated in the highest category (as rated by Moody's or S&P or, if
            unrated, determined by the Adviser to be of comparable quality).
            The percentage of a Fund's assets invested in securities in a par-
            ticular rating category will vary. Following is a description of
            Moody's and S&P's ratings applicable to fixed income securities.
                
MOODY'S     CORPORATE AND MUNICIPAL BOND RATINGS
INVESTORS      Aaa: Bonds which are rated Aaa are judged to be of the best
SERVICE,    quality. They carry the smallest degree of investment risk and are
INC.        generally referred to as "gilt edge." Interest payments are pro-
            tected by a large or by an exceptionally stable margin and princi-
            pal is secure. While the various protective elements are likely to
            change, such changes as can be visualized are most unlikely to im-
            pair the fundamentally strong position of such issues.
               Aa: Bonds which are rated Aa are judged to be of high quality
            by all standards. Together with the Aaa group they comprise what
            are generally known as high-grade bonds. They are rated lower than
            the best bonds because margins of protection may not be as large
            as in Aaa securities or fluctuation of protective elements may be
            of greater amplitude or there may be other elements present that
            make the long-term risks appear somewhat larger than with Aaa se-
            curities.
               A: Bonds which are rated A possess many favorable investment
            attributes and are to be considered as upper-medium-grade obliga-
            tions. Factors giving security to principal and interest are con-
            sidered adequate but elements may be present that suggest a sus-
            ceptibility to impairment sometime in the future.
               Baa: Bonds which are rated Baa are considered as medium-grade
            obligations (i.e., they are neither highly protected nor poorly
            secured). Interest payments and principal security appear adequate
            for the present but certain protective elements may be lacking or
            may be characteristically unreliable over any great length of
            time. Such bonds lack outstanding investment characteristics and
            in fact have speculative characteristics as well.
               Ba: Bonds which are rated Ba are judged to have speculative el-
            ements; their future cannot be considered as well-assured. Often
            the protection of interest and principal payments may be very mod-
            erate and thereby not well safeguarded during both good and bad
            times over the future. Uncertainty of position characterizes bonds
            in this class.
               B: Bonds which are rated B generally lack characteristics of a
            desirable investment. Assurance of interest and principal payments
            or of maintenance of other terms of the contract over any long pe-
            riod of time may be small.
               Caa: Bonds which are rated Caa are of poor standing. Such is-
            sues may be in default or there may be present elements of danger
            with respect to principal or interest.
               Ca: Bonds which are rated Ca represent obligations which are
            speculative in a high degree. Such issues are often in default or
            have other marked shortcomings.
               C: Bonds which are rated C are the lowest rated class of bonds
            and issues so rated can be regarded as having extremely poor pros-
            pects of ever attaining any real investment standing.
               Moody's applies numerical modifiers, 1, 2, and 3 in each ge-
            neric rating classified from Aa through B in its corporate bond
            rating system. The modifier 1 indicates that the security ranks in
            the higher end of its generic rating category; the modifier 2 in-
            dicates a mid-range ranking; and the modifier 3 indicates that the
            issue ranks in the lower end of its generic rating category.
 
38
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
            CORPORATE SHORT-TERM DEBT RATINGS
            Moody's short-term debt ratings are opinions of the ability of is-
            suers to repay punctually senior debt obligations which have an
            original maturity not exceeding one year. Obligations relying upon
            support mechanisms such as letters of credit and bonds of indem-
            nity are excluded unless explicitly rated.
               Moody's employs the following three designations, all judged to
            be investment grade, to indicate the relative repayment ability of
            rated issuers:
               PRIME-1: Issuers rated Prime-1 (or supporting institutions)
            have a superior ability for repayment of senior short-term debt
            obligations. Prime-1 repayment ability will often be evidenced by
            many of the following characteristics: leading market positions in
            well-established industries; high rates of return on funds em-
            ployed; conservative capitalization structure with moderate reli-
            ance on debt and ample asset protection; broad margins in earnings
            coverage of fixed financial charges and high internal cash genera-
            tion; and well-established access to a range of financial markets
            and assured sources of alternate liquidity.
               PRIME-2: Issuers rated Prime-2 (or supporting institutions)
            have a strong ability for repayment of senior short-term debt ob-
            ligations. This will normally be evidenced by many of the charac-
            teristics cited above but to a lesser degree. Earnings trends and
            coverage ratios, while sound, may be more subject to variation.
            Capitalization characteristics, while still appropriate, may be
            more affected by external conditions. Ample alternate liquidity is
            maintained.
               PRIME-3: Issuers rated Prime-3 (or supporting institutions)
            have an acceptable ability for repayment of senior short-term ob-
            ligations. The effect of industry characteristics and market com-
            positions may be more pronounced. Variability in earnings and
            profitability may result in changes in the level of debt protec-
            tion measurements and may require relatively high financial lever-
            age. Adequate alternate liquidity is maintained.
               NOT PRIME: Issuers rated Not Prime do not fall within any of
            the Prime rating categories.
 
 
STANDARD &  CORPORATE AND MUNICIPAL BOND RATINGS
POOR'S
RATINGS
SERVICES
 
            INVESTMENT GRADE
               AAA: Debt rated AAA has the highest rating assigned by S&P. Ca-
            pacity to pay interest and repay principal is extremely strong.
               AA: Debt rated AA has a very strong capacity to pay interest
            and repay principal and differs from the highest rated issues only
            in small degree.
               A: Debt rated A has a strong capacity to pay interest and repay
            principal although it is somewhat more susceptible to the adverse
            effects of changes in circumstances and economic conditions than
            debt in higher rated categories.
               BBB: Debt rated BBB is regarded as having an adequate capacity
            to pay interest and repay principal. Whereas it normally exhibits
            adequate protection parameters, adverse economic conditions, or
            changing circumstances are more likely to lead to a weakened ca-
            pacity to pay interest and repay principal for debt in this cate-
            gory than in higher-rated categories.
 
            SPECULATIVE GRADE
            Debt rated BB, B, CCC, CC, and C is regarded as having predomi-
            nantly speculative characteristics with respect to capacity to pay
            interest and repay principal. BB indicates the least degree of
            speculation and C the highest. While such debt will likely have
            some quality and protective characteristics, these are outweighed
            by large uncertainties or major exposures to adverse conditions.
               BB: Debt rated BB has less near-term vulnerability to default
            than other speculative issues. However, it faces major ongoing un-
            certainties or exposure to adverse business, financial, or eco-
            nomic conditions which could lead to inadequate capacity to meet
            timely interest and principal payments. The BB rating category is
            also used for debt subordinated to senior debt that is assigned an
            actual or implied BBB- rating.
               B: Debt rated B has a greater vulnerability to default but cur-
            rently has the capacity to meet interest payments and principal
            repayments. Adverse business, financial, or economic conditions
            will likely impair capacity or willingness to
                                                     August 1, 1998 Prospectus
                                                                              39
<PAGE>
 
            pay interest and repay principal. The B rating category is also
            used for debt subordinated to senior debt that is assigned an ac-
            tual or implied BB or BB- rating.
               CCC: Debt rated CCC has a currently identifiable vulnerability
            to default and is dependent upon favorable business, financial,
            and economic conditions to meet timely payment of interest and re-
            payment of principal. In the event of adverse business, financial
            or economic conditions, it is not likely to have the capacity to
            pay interest and repay principal. The CCC rating category is also
            used for debt subordinated to senior debt that is assigned an ac-
            tual or implied B or B- rating.
               CC: The rating CC is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC rating.
               C: The rating C is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC- debt rat-
            ing. The C rating may be used to cover a situation where a bank-
            ruptcy petition has been filed, but debt service payments are con-
            tinued.
               CI: The rating CI is reserved for income bonds on which no in-
            terest is being paid.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period. The D rating will also be used upon the filing of a
            bankruptcy petition if debt service payments are jeopardized.
               Plus (+) or Minus (-): The ratings from AA to CCC may be modi-
            fied by the addition of a plus or minus sign to show relative
            standing within the major rating categories.
               Provisional ratings: The letter "p" indicates that the rating
            is provisional. A provisional rating assumes the successful com-
            pletion of the project being financed by the debt being rated and
            indicates that payment of debt service requirements is largely or
            entirely dependent upon the successful and timely completion of
            the project. This rating, however, while addressing credit quality
            subsequent to completion of the project, makes no comment on the
            likelihood of, or the risk of default upon failure of, such com-
            pletion. The investor should exercise his own judgment with re-
            spect to such likelihood and risk.
               r: The "r" is attached to highlight derivative, hybrid, and
            certain other obligations that S&P believes may experience high
            volatility or high variability in expected returns due to non-
            credit risks. Examples of such obligations are: securities whose
            principal or interest return is indexed to equities, commodities,
            or currencies; certain swaps and options; and interest only and
            principal only mortgage securities.
               The absence of an "r" symbol should not be taken as an indica-
            tion that an obligation will exhibit no volatility or variability
            in total return.
               N.R.: Not rated.
               Debt obligations of issuers outside the United States and its
            territories are rated on the same basis as domestic corporate and
            municipal issues. The ratings measure the creditworthiness of the
            obligor but do not take into account currency exchange and related
            uncertainties.
 
            COMMERCIAL PAPER RATING DEFINITIONS
            An S&P commercial paper rating is a current assessment of the
            likelihood of timely payment of debt having an original maturity
            of no more than 365 days. Ratings are graded into several catego-
            ries, ranging from A for the highest quality obligations to D for
            the lowest. These categories are as follows:
               A-1: This highest category indicates that the degree of safety
            regarding timely payment is strong. Those issues determined to
            possess extremely strong safety characteristics are denoted with a
            plus sign (+) designation.
               A-2: Capacity for timely payment on issues with this designa-
            tion is satisfactory. However, the relative degree of safety is
            not as high as for issues designated A-1.
 
40
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               A-3: Issues carrying this designation have adequate capacity
            for timely payment. They are, however, more vulnerable to the ad-
            verse effects of changes in circumstances than obligations carry-
            ing the higher designations.
               B: Issues rated B are regarded as having only speculative ca-
            pacity for timely payment.
               C: This rating is assigned to short-term debt obligations with
            a doubtful capacity for payment.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due, even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period.
               A commercial paper rating is not a recommendation to purchase,
            sell or hold a security inasmuch as it does not comment as to mar-
            ket price or suitability for a particular investor. The ratings
            are based on current information furnished to S&P by the issuer or
            obtained from other sources it considers reliable. S&P does not
            perform an audit in connection with any rating and may, on occa-
            sion, rely on unaudited financial information. The ratings may be
            changed, suspended, or withdrawn as a result of changes in or un-
            availability of such information.
 
                                                     August 1, 1998 Prospectus
                                                                              41
<PAGE>
 
<TABLE> 
<C>                      <S>                                                                                       
                         ------------------------------------------------------------------------------------------
PIMCO Funds:             INVESTMENT ADVISER AND ADMINISTRATOR                                                      
Pacific Investment       Pacific Investment Management Company, 840 Newport Center Drive, Suite 300,               
Management Series        Newport Beach, CA 92660                                                                   
                         ------------------------------------------------------------------------------------------
                         DISTRIBUTOR                                                                               
                         PIMCO Funds Distributors LLC, 2187 Atlantic Street, Stamford,
                         CT 06902                     
                         ------------------------------------------------------------------------------------------
                         CUSTODIAN                                                                                 
                         Investors Fiduciary Trust Company, 801 Pennsylvania, Kansas City, MO 64105                
                         ------------------------------------------------------------------------------------------
                         SHAREHOLDER SERVICING AGENT AND TRANSFER AGENT                                            
                         Shareholder Services, Inc., P.O. Box 5866, Denver, CO 80217                               
                         ------------------------------------------------------------------------------------------
                         INDEPENDENT ACCOUNTANTS 
                         PricewaterhouseCoopers LLP, 1055 Broadway, Kansas City, MO 64105                          
                         ------------------------------------------------------------------------------------------
                         LEGAL COUNSEL
                         Dechert Price & Rhoads, 1775 Eye Street N.W., Washington, D.C. 20006-2401
                         ------------------------------------------------------------------------------------------
                         For further information about the PIMCO Funds, call 1-888-87-PIMCO or visit our Web site  
                         at www.pimcofunds.com.                                                                    
</TABLE> 
<PAGE>
 
                            PIMCO TOTAL RETURN FUND

- --------------------------------------------------------------------------------
OBJECTIVE

Seeking maximum total return, consistent with preservation of capital and 
prudent investment management.

- --------------------------------------------------------------------------------
PRIMARY INVESTMENTS

An intermediate-term portfolio of investment grade fixed income securities.

- --------------------------------------------------------------------------------
INVESTMENT STYLE

TOTAL RETURN STRATEGY  The Fund seeks total return -- yield plus appreciation.

RISK MANAGEMENT  The portfolio manager seeks to manage risk in a number of ways,
such as maintaining an intermediate-term portfolio with a duration that normally
varies within a 3- to 6-year time frame. However, net asset value will
fluctuate.

QUALITY  The Fund maintains a portfolio primarily consisting of investment 
grade fixed income securities.

DIVERSIFICATION  Subject to market conditions, the fund actively invests across 
all sectors of the fixed income market in order to maximize investment 
opportunities.

- --------------------------------------------------------------------------------
PORTFOLIO MANAGER

Bill Gross of Pacific Investment Management Company, a PIMCO Advisors 
institutional investment firm. With approximately $138 billion in assets under 
management ($35.6 billion in mutual funds), the firm is one of the largest bond 
managers in the country.  Bill Gross has over 27 years investment experience.

- --------------------------------------------------------------------------------
FUND PERFORMANCE 

For the latest PIMCO Total Return Fund performance, call 1-800-227-7337 or visit
our Web site at www.pimcofunds.com.

For more information about the Fund, see the following prospectus.  PIMCO Funds 
Distributors LLC, 2187 Atlantic Street, Stamford, CT 06902, www.pimcofunds.com.

                                                                       P I M C O
                                                                           FUNDS
<PAGE>
 
            Prospectus
            PIMCO Total Return Fund
               
            August 1, 1998     
               
            PIMCO Funds (the "Trust") is an open-end series management invest-
            ment company consisting of twenty-five separate investment portfo-
            lios, each with different investment objectives and strategies.
            The Total Return Fund (the "Fund") is described herein. The Trust
            is designed to provide access to the professional investment man-
            agement services offered by Pacific Investment Management Company
            ("Pacific Investment Management"), which serves as investment ad-
            viser (the "Adviser") to the Fund. The address of PIMCO Funds is
            840 Newport Center Drive, Suite 300, Newport Beach, CA 92660.     
 
            The Fund offers Class A shares in this Prospectus, which is in-
            tended for participants in designated employer-sponsored retire-
            ment or savings plans. Through other prospectuses, the Fund and
            the other series of the Trust offer Class A shares (sold subject
            to a front-end sales charge) for public investment, and offer up
            to five additional classes of shares, including Institutional
            Class shares, Administrative Class shares, Class B shares (sold
            subject to a contingent deferred sales charge), Class C shares
            (sold subject to an asset based sales charge) and Class D Shares.
            See "Description of the Trust--Multiple Classes of Shares."
 
 
            This Prospectus concisely describes the information investors
            should know before investing in the Fund. Please read this Pro-
            spectus carefully and keep it for further reference. Information
            about the investment objective of the Fund, along with a detailed
            description of the types of securities in which the Fund may in-
            vest and of investment policies and restrictions applicable to the
            Fund, are set forth in this Prospectus. There can be no assurance
            that the investment objective of the Fund will be achieved. Be-
            cause the market value of the Fund's investments will change, the
            investment returns and net asset value per share of the Fund will
            vary.
 
            The Fund is an investment option under an employer-sponsored re-
            tirement or savings program. The administrator of a retirement
            plan or an employee benefits office can provide participants with
            detailed information on how to participate in such a plan and how
            to elect the Fund as an investment option. Please call 800-426-
            0107 with any questions about the Fund. Questions about a partici-
            pant's plan account should be directed to the plan administrator
            or the organization that provides recordkeeping services for the
            plan.
               
            A Statement of Additional Information, dated August 1, 1998, as
            amended or supplemented from time to time, is available free of
            charge by writing to PIMCO Funds Distributors LLC (the "Distribu-
            tor"), 2187 Atlantic Street, Stamford, Connecticut 06902, or by
            telephoning 800-426-0107. The Statement of Additional Information,
            which contains more detailed information about the Trust, has been
            filed with the Securities and Exchange Commission and is incorpo-
            rated by reference in this Prospectus. The Securities and Exchange
            Commission maintains an Internet World Wide Web site (at
            www.sec.gov) which contains the Statement of Additional Informa-
            tion, materials that are incorporated by reference in this Pro-
            spectus and the Statement of Additional Information, and other in-
            formation about the Fund.     
 
            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SE-
            CURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMIS-
            SION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
            SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
            PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OF-
            FENSE.
 
            SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARAN-
            TEED OR ENDORSED BY, ANY FINANCIAL INSTITUTION, AND THE SHARES ARE
            NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORA-
            TION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY.
 
            THE FUND MAY INVEST ALL OF ITS ASSETS IN DERIVATIVE INSTRUMENTS,
            SOME OF WHICH MAY BE PARTICULARLY SENSITIVE TO CHANGES IN PREVAIL-
            ING INTEREST RATES. UNEXPECTED CHANGES IN INTEREST RATES MAY AD-
            VERSELY AFFECT THE VALUE OF THE FUND'S INVESTMENTS IN PARTICULAR
            DERIVATIVE INSTRUMENTS.
 
              TABLE OF CONTENTS
 
<TABLE>   
<S>                            <C>
Overview......................   3
Schedule of Fees..............   3
Financial Highlights..........   4
Investment Objective and
Policies......................   5
Investment Risks and
Considerations................   6
Characteristics and Risks of
 Securities
 and Investment Techniques....   7
Performance Information.......  21
How to Buy Shares.............  22
Exchange Privilege............  23
</TABLE>    
<TABLE>   
<S>                                <C>
How to Redeem.....................  23
Distributor and Distribution and
Servicing Plan....................  23
How Net Asset Value Is Determined
 ..................................  24
Distributions.....................  25
Taxes.............................  25
Management of the Trust...........  26
Description of the Trust..........  28
Mailings to Shareholders..........  29
Appendix A -- Description of
Duration..........................  30
Appendix B -- Description of
Securities Ratings................  31
</TABLE>    
 PIMCO Funds: Pacific Investment Management Series
2
<PAGE>
 
            Overview
               
            Pacific Investment Management, a subsidiary partnership of PIMCO
            Advisors L.P., is the investment adviser of the Fund. Pacific In-
            vestment Management is one of the premier fixed income investment
            management firms in the U.S. As of June 30, 1998, Pacific Invest-
            ment Management had over $138 billion in assets under management.
            Pacific Investment Management invests in all sectors of the fixed
            income market, using its total return philosophy--seeking capital
            appreciation as well as yield.     
 
 
FUND
PROFILE  <TABLE>
         <CAPTION>
           PIMCO FUND NAME   PRIMARY OBJECTIVE                 DURATION  CREDIT QUALITY(/1/)
              ------------------------------------------------------------------------------
           <S>               <C>                               <C>       <C>
           TOTAL
            RETURN
            FUND             Maximum total return, consistent  3-6 years B to Aaa; max
                             with preservation of capital                10% below Baa
                             and prudent investment management
         </TABLE>
 
            1. As rated by Moody's Investors Service, Inc., or if unrated, de-
            termined to be of comparable quality. For specific information
            concerning the credit quality of the securities in the Fund's
            portfolio, see "Investment Objective and Policies."
 
            Schedule of Fees
 
 
SHAREHOLDER
TRANSACTION
EXPENSES
 
<TABLE>
<CAPTION>
                                                           CLASS A SHARES
              -----------------------------------------------------------
           <S>                                         <C>
           MAXIMUM INITIAL SALES CHARGE IMPOSED ON
            PURCHASES                                         None(/1/)
              -----------------------------------------------------------
           MAXIMUM SALES CHARGE IMPOSED ON REINVESTED
            DIVIDENDS                                         None
              -----------------------------------------------------------
           MAXIMUM CONTINGENT DEFERRED SALES CHARGE
            ("CDSC")                                          None(/1/)
              -----------------------------------------------------------
           EXCHANGE FEE                                       None
</TABLE>
 
            1. Applies only to shares purchased through designated 401(k)
            plans.
 
 
OPERATING
EXPENSES <TABLE>
         <CAPTION>
                                                                 EXAMPLE: You
                                                                 would pay the
                                                                 following
                                                                 expenses on a
                                                                 $1,000 investment
                                                                 assuming (1) 5%
                                                                 annual return and
                                                                 (2) redemption at
                    ANNUAL FUND OPERATING EXPENSES               the end of each
                    (As a percentage of average net assets):     time period:
                                                      TOTAL FUND
                    ADVISORY ADMINISTRATIVE 12B-1     OPERATING  YEAR
           FUND     FEE      FEE            FEES(/1/) EXPENSES   1    3   5   10
              --------------------------------------------------------------------
           <S>      <C>      <C>            <C>       <C>        <C>  <C> <C> <C>
           TOTAL
            RETURN  .25%     .40%           .25%      .90%       $9   $29 $50 $111
              --------------------------------------------------------------------
         </TABLE>
 
            1. 12b-1 fees represent servicing fees which are paid annually to
            the Distributor and repaid to participating brokers, certain banks
            and other financial intermediaries. See "Distributor and Distribu-
            tion and Servicing Plans."
 
            The purpose of the foregoing tables is to assist investors in un-
            derstanding the various costs and expenses of the Trust that are
            borne directly or indirectly by Class A shareholders of the Fund.
            The information has been restated to reflect the Fund's current
            fees and expenses.
 
            NOTE: THE FIGURES SHOWN IN THE EXAMPLE ARE ENTIRELY HYPOTHETICAL,
            AND ASSUME NO PAYMENT OF A SALES LOAD. THEY ARE NOT REPRESENTA-
            TIONS OF PAST OR FUTURE PERFORMANCE OR EXPENSES; ACTUAL PERFOR-
            MANCE AND/OR EXPENSES MAY BE MORE OR LESS THAN SHOWN.
                                                     August 1, 1998 Prospectus
                                                                               3
<PAGE>
 
            Financial Highlights
               
            The following information regarding selected per share data and
            ratios for shares of the Total Return Fund is part of the Trust's
            financial statements, which are included in the Trust's Annual Re-
            port dated March 31, 1998, and incorporated by reference in the
            Statement of Additional Information. The Trust's audited financial
            statements and selected per share data and ratios appearing below
            have been examined by PricewaterhouseCoopers LLP (formerly Price
            Waterhouse LLP), independent accountants, whose opinion thereon is
            also included in the Annual Report, which may be obtained without
            charge.     
 
            Selected data for a share outstanding throughout each period:
 
 
 
<TABLE>   
<CAPTION>
           TOTAL RETURN FUND--CLASS A                     3/31/98   3/31/97 (A)
              -----------------------------------------------------------------
           <S>                                            <C>       <C>
           NET ASSET VALUE, BEGINNING OF PERIOD           $  10.27   $  10.40
                                                          --------   --------
           INCOME FROM INVESTMENT OPERATIONS:
           NET INVESTMENT INCOME                              0.58+      0.12
           NET GAINS OR LOSSES ON SECURITIES (BOTH
            REALIZED AND UNREALIZED)                          0.63+     (0.12)
                                                          --------   --------
           TOTAL INCOME FROM INVESTMENT OPERATIONS            1.21      (0.00)
                                                          --------   --------
           LESS DISTRIBUTIONS:
           DIVIDENDS FROM NET INVESTMENT INCOME              (0.57)     (0.13)
           DIVIDENDS IN EXCESS OF NET INVESTMENT INCOME      (0.02)      0.00
           DIVIDENDS FROM NET REALIZED CAPITAL GAINS         (0.27)      0.00
                                                          --------   --------
           TOTAL DISTRIBUTIONS                               (0.86)     (0.13)
                                                          --------   --------
           NET ASSET VALUE, END OF PERIOD                 $  10.62   $  10.27
                                                          ========   ========
           TOTAL RETURN (WITHOUT SALES CHARGE)               12.11%      0.02%
           RATIOS/SUPPLEMENTAL DATA
           NET ASSETS, END OF PERIOD (IN 000S)            $533,893   $115,742
           RATIO OF EXPENSES TO AVERAGE NET ASSETS            0.90%      0.91%+
           RATIO OF NET INVESTMENT INCOME TO AVERAGE NET
            ASSETS                                            5.46%      6.08%+
           PORTFOLIO TURNOVER RATE                             206%       173%
</TABLE>    
 
            a   From commencement of operations, January 13, 1997.
               
            +   Annualized.     
               
            +   Per share amounts based on average number of shares outstand-
            ing during the period.     
 PIMCO Funds: Pacific Investment Management Series
4
<PAGE>
 
            Investment Objective and Policies
               
            The investment objective and general investment policies of the
            Fund are described below. There can be no assurance that the in-
            vestment objective of the Fund will be achieved. For temporary,
            defensive or emergency purposes, the Fund may invest without limit
            in U.S. debt securities, including short-term money market securi-
            ties, when in the opinion of the Adviser it is appropriate to do
            so. It is impossible to predict for how long such alternative
            strategies will be utilized. The value of all securities and other
            instruments held by the Fund will vary from time to time in re-
            sponse to a wide variety of market factors. Consequently, the net
            asset value per share of the Fund will vary.     
               The investment objective of the Fund is fundamental and may not
            be changed without shareholder approval by vote of a majority of
            the outstanding shares of the Fund. If there is a change in the
            Fund's investment objective, including a change approved by a
            shareholder vote, shareholders should consider whether the Fund
            remains an appropriate investment in light of their then current
            financial position and needs.
               Specific portfolio securities eligible for purchase by the
            Fund, investment techniques that may be used by the Fund, and the
            risks associated with these securities and techniques are de-
            scribed more fully under "Characteristics and Risks of Securities
            and Investment Techniques" in this Prospectus and "Investment Ob-
            jectives and Policies" in the Statement of Additional Information.
 
 
TOTAL       The investment objective of the Fund is to seek to maximize total
RETURN FUND return, consistent with preservation of capital and prudent in-
DESCRIPTION vestment management.
               
               In selecting securities for the Fund, the Adviser utilizes eco-
            nomic forecasting, interest rate anticipation, credit and call
            risk analysis, foreign currency exchange rate forecasting, and
            other security selection techniques. The proportion of the Fund's
            assets committed to investment in securities with particular char-
            acteristics (such as maturity, type and coupon rate) will vary
            based on the Adviser's outlook for the U.S. and foreign economies,
            the financial markets, and other factors.     
               
               The Fund invests under normal circumstances at least 65% of its
            assets in a diversified portfolio of the following types of secu-
            rities, which may have a variety of maturities: securities issued
            or guaranteed by the U.S. Government, its agencies or instrumen-
            talities ("U.S. Government securities"); corporate debt securi-
            ties, including convertible securities and corporate commercial
            paper; mortgage-backed and other asset-backed securities; infla-
            tion-indexed bonds issued by both governments and corporations;
            structured notes, including hybrid or "indexed" securities, catas-
            trophe bonds, and loan participations; delayed funding loans and
            revolving credit facilities; bank certificates of deposit, fixed
            time deposits and bankers' acceptances; repurchase agreements and
            reverse repurchase agreements; obligations of foreign governments
            or their subdivisions, agencies and instrumentalities; and obliga-
            tions of international agencies or supranational entities. Fixed
            income securities may have fixed, variable, or floating rates of
            interest, including rates of interest that vary inversely at a
            multiple of a designated or floating rate, or that vary according
            to changes in relative values of currencies.     
               
               The average portfolio duration of the Fund will normally vary
            within a three- to six-year time frame based on the Adviser's
            forecast for interest rates. The Fund may invest up to 10% of its
            assets in fixed income securities that are rated below investment
            grade (i.e., securities rated at least Baa by Moody's Investors
            Service, Inc. ("Moody's") or BBB by Standard & Poor's Ratings
            Services ("S&P")) but rated B or higher by Moody's or S&P (or, if
            unrated, determined by the Adviser to be of comparable quality).
            For information on the risks associated with investments in secu-
            rities rated below investment grade, see "Appendix B--Description
            of Securities Ratings." The Fund may also invest up to 20% of its
            assets in securities denominated in foreign currencies, and may
            invest beyond this limit in U.S. dollar-denominated securities of
            foreign issuers. Portfolio holdings will be concentrated in areas
            of the bond market (based on quality, sector, coupon or maturity)
            which the Adviser believes to be relatively undervalued. The Fund
            may invest all of its assets in derivative instruments or in mort-
            gage- or asset-backed securities.     
               The Fund may adhere to its investment policy by entering into a
            series of purchase and sale contracts or utilizing other invest-
            ment techniques by which it may obtain market exposure to the se-
            curities in which it primarily invests. In addition, the Fund may
            lend its portfolio securities to brokers, dealers and other finan-
            cial institutions in order to earn income. The Fund may purchase
            and sell options and futures subject to the limits discussed be-
            low, engage in credit spread trades and enter into forward foreign
            currency contracts.
                                                     August 1, 1998 Prospectus
                                                                              5
<PAGE>
 
               
              As a non-fundamental, operating policy, the Adviser intends to
            use foreign currency-related derivative instruments (currency
            futures and related options, currency options, forward contracts
            and swap agreements) in an effort to hedge foreign currency risk
            with respect to at least 75% of the assets of the Fund denominated
            in currencies other than the U.S. dollar. There can be no assur-
            ance that the Adviser will be successful in doing so. The active
            use of currency derivatives involves transaction costs which may
            adversely affect yield and return.     
 
 
 
TOTAL       The "total return" sought by the Fund will consist of interest and
RETURN      dividends from underlying securities, capital appreciation re-
            flected in unrealized increases in value of portfolio securities
            (realized by the shareholder only upon selling shares), or real-
            ized from the purchase and sale of securities and use of futures
            and options, or gains from favorable changes in foreign currency
            exchange rates. Generally, over the long term, the total return
            obtained by a portfolio investing primarily in fixed income secu-
            rities is not expected to be as great as that obtained by a port-
            folio that invests primarily in equity securities. At the same
            time, the market risk and price volatility of a fixed income port-
            folio is expected to be less than that of an equity portfolio, so
            that a fixed income portfolio is generally considered to be a more
            conservative investment. The change in market value of fixed in-
            come securities (and therefore their capital appreciation or de-
            preciation) is largely a function of changes in the current level
            of interest rates.
               
               In managing fixed income securities, one of the principal tools
            generally used by the Adviser is "duration," which is a measure of
            the expected life of a fixed income security on a present value
            basis, incorporating a bond's yield, coupon interest payments, fi-
            nal maturity and call features. See "Appendix A--Description of
            Duration." Generally, when interest rates are falling, a portfolio
            with a shorter duration will not generate as high a level of total
            return as a portfolio with a longer duration. Conversely, when in-
            terest rates are rising, a portfolio with a shorter duration will
            generally outperform longer duration portfolios. When interest
            rates are flat, shorter duration portfolios generally will not
            generate as high a level of total return as longer duration port-
            folios (assuming that long-term interest rates are higher than
            short-term rates, which is commonly the case). With respect to the
            composition of any fixed income portfolio, the longer the duration
            of the portfolio, the greater the anticipated potential for total
            return, with, however, greater attendant market risk and price
            volatility than for a portfolio with a shorter duration. The mar-
            ket value of fixed income securities denominated in currencies
            other than the U.S. dollar also may be affected by movements in
            foreign currency exchange rates.     
 
            Investment Risks and Considerations
 
            The following are some of the principal risks of investing in the
            Fund. Investors should read this Prospectus carefully for a more
            complete discussion of the risks relating to an investment in the
            Fund. The net asset value per share of the Fund may be less at the
            time of redemption than it was at the time of investment. General-
            ly, the value of fixed income securities can be expected to vary
            inversely with changes in prevailing interest rates, i.e., as in-
            terest rates rise, market value tends to decrease, and vice versa.
            In addition, the Fund may invest in securities rated lower than
            Baa by Moody's or BBB by S&P. Such securities carry a high degree
            of credit risk and are considered speculative by the major rating
            agencies.
               The Fund may invest in securities of foreign issuers, which may
            be subject to additional risk factors, including foreign currency
            and political risks, not applicable to securities of U.S. issuers.
            The Fund's investment techniques may involve a form of borrowing,
            which may tend to exaggerate the effect on net asset value of any
            increase or decrease in the market value of the Fund's portfolio
            and may require liquidation of portfolio positions when it is not
            advantageous to do so. The Fund may sell securities short, which
            exposes the Fund to a risk of loss if the value of the security
            sold short should increase.
               The Fund may use derivative instruments, consisting of futures,
            options, options on futures, and swap agreements, for hedging pur-
            poses or as part of its investment strategies. Use of these in-
            struments may involve certain costs and risks,
 PIMCO Funds: Pacific Investment Management Series
6
<PAGE>
 
               
            including the risk that the Fund could not close out a position
            when it would be most advantageous to do so, the risk of an imper-
            fect correlation between the value of the securities being hedged
            and the value of the particular derivative instrument, and the
            risk that unexpected changes in interest rates may adversely af-
            fect the value of the Fund's investments in particular derivative
            instruments. Unless otherwise indicated, all limitations applica-
            ble to the Fund's investments (as stated in this Prospectus and in
            the Statement of Additional Information) apply only at the time a
            transaction is entered into. Any subsequent change in a rating as-
            signed by any rating service to a security (or, if unrated, deemed
            to be of comparable quality), or change in the percentage of the
            Fund's assets invested in certain securities or other instruments,
            or change in the average duration of the Fund's investment portfo-
            lio, resulting from market fluctuations or other changes in the
            Fund's total assets, will not require the Fund to dispose of an
            investment until the Adviser determines that it is practicable to
            sell or close out the investment without undue market or tax con-
            sequences to the Fund. In the event that ratings services assign
            different ratings to the same security, the Adviser will determine
            which rating it believes best reflects the security's quality and
            risk at that time, which may be the higher of the several assigned
            ratings.     
               
               The Fund offers its shares to both retail and institutional in-
            vestors. Institutional shareholders, some of whom also may be in-
            vestment advisory clients of Pacific Investment Management, may
            hold large positions in the Fund. Such shareholders may on occa-
            sion make large redemptions of their holdings in the Fund to meet
            their liquidity needs, in connection with strategic adjustments to
            their overall portfolio of investments, or for other purposes.
            Large redemptions from the Fund could require the Adviser to liq-
            uidate portfolio positions when it is not most desirable to do so.
            Liquidation of portfolio holdings also may cause the Fund to real-
            ize taxable capital gains.     
 
            Characteristics and Risks of
            Securities and Investment Techniques
 
            The following describes in greater detail different types of secu-
            rities and investment techniques used by the Fund, and discusses
            certain concepts relevant to the investment policies of the Fund.
            Additional information about the Fund's investments and investment
            practices may be found in the Statement of Additional Information.
 
 
U.S.        U.S. Government securities are obligations of, or guaranteed by,
GOVERNMENT  the U.S. Government, its agencies or instrumentalities. The U.S.
SECURITIES  Government does not guarantee the net asset value of the Fund's
            shares. Some U.S. Government securities, such as Treasury bills,
            notes and bonds, and securities guaranteed by the Government Na-
            tional Mortgage Association ("GNMA"), are supported by the full
            faith and credit of the United States; others, such as those of
            the Federal Home Loan Banks, are supported by the right of the is-
            suer to borrow from the U.S. Treasury; others, such as those of
            the Federal National Mortgage Association ("FNMA"), are supported
            by the discretionary authority of the U.S. Government to purchase
            the agency's obligations; and still others, such as those of the
            Student Loan Marketing Association, are supported only by the
            credit of the instrumentality. U.S. Government securities include
            securities that have no coupons, or have been stripped of their
            unmatured interest coupons, individual interest coupons from such
            securities that trade separately, and evidences of receipt of such
            securities. Such securities may pay no cash income, and are pur-
            chased at a deep discount from their value at maturity. Because
            interest on zero coupon securities is not distributed on a current
            basis but is, in effect, compounded, zero coupon securities tend
            to be subject to greater market risk than interest-paying securi-
            ties of similar maturities. Custodial receipts issued in connec-
            tion with so-called trademark zero
            coupon securities, such as CATs and TIGRs, are not issued by the
            U.S. Treasury, and are therefore not U.S. Government securities,
            although the underlying bond represented by such receipt is a debt
            obligation of the U.S. Treasury. Other zero coupon Treasury secu-
            rities (STRIPs and CUBEs) are direct obligations of the U.S. Gov-
            ernment.
                                                     August 1, 1998 Prospectus
                                                                               7
<PAGE>
 
 
 
            Corporate debt securities include corporate bonds, debentures,
CORPORATE   notes and other similar corporate debt instruments, including con-
DEBT        vertible securities. Debt securities may be acquired with warrants
SECURITIES  attached. Corporate income-producing securities may also include
            forms of preferred or preference stock. The rate of interest on a
            corporate debt security may be fixed, floating or variable, and
            may vary inversely with respect to a reference rate. See "Variable
            and Floating Rate Securities" below. The rate of return or return
            of principal on some debt obligations may be linked or indexed to
            the level of exchange rates between the U.S. dollar and a foreign
            currency or currencies.
               
               Investments in corporate debt securities that are rated below
            investment grade (rated below Baa (Moody's) or BBB (S&P)) are de-
            scribed as "speculative" both by Moody's and S&P. Such securities
            are sometimes referred to as "junk bonds," and may be subject to
            greater market fluctuations, less liquidity and greater risk of
            loss of income or principal, including a greater possibility of
            default or bankruptcy of the issuer of such securities, than are
            more highly rated debt securities. Moody's also describes securi-
            ties rated Baa as having speculative characteristics. The Adviser
            seeks to minimize these risks through diversification, in-depth
            credit analysis and attention to current developments in interest
            rates and market conditions. See "Appendix B--Description of Secu-
            rities Ratings." Investments in high yield securities are dis-
            cussed separately below under "High Yield Securities ("Junk
            Bonds")."     
 
 
CONVERTIBLE The Fund may invest in convertible securities, which may offer
SECURITIES  higher income than the common stocks into which they are convert-
            ible. Typically, convertible securities are callable by the compa-
            ny, which may, in effect, force conversion before the holder would
            otherwise choose.
               The convertible securities in which the Fund may invest consist
            of bonds, notes, debentures and preferred stocks which may be con-
            verted or exchanged at a stated or determinable exchange ratio
            into underlying shares of common stock. The Fund may be required
            to permit the issuer of a convertible security to redeem the secu-
            rity, convert it into the underlying common stock, or sell it to a
            third party. Thus, the Fund may not be able to control whether the
            issuer of a convertible security chooses to convert that security.
            If the issuer chooses to do so, this action could have an adverse
            effect on the Fund's ability to achieve its investment objectives.
               While the Fund intends to invest primarily in fixed income se-
            curities, it may invest in convertible securities or equity secu-
            rities. While some countries or companies may be regarded as fa-
            vorable investments, pure fixed income opportunities may be unat-
            tractive or limited due to insufficient supply, legal or technical
            restrictions. In such cases, the Fund may consider equity securi-
            ties or convertible bonds to gain exposure to such investments.
 
 
LOAN
PARTICIPATIONS
AND
ASSIGNMENTS
            The Fund may invest in fixed- and floating-rate loans arranged
            through private negotiations between an issuer of debt instruments
            and one or more financial institutions ("lenders"). Generally, the
            Fund's investments in loans are expected to take the form of loan
            participations and assignments of portions of loans from third
            parties.
               Large loans to corporations or governments may be shared or
            syndicated among several lenders, usually banks. The Fund may par-
            ticipate in such syndicates, or can buy part of a loan, becoming a
            direct lender. Participations and assignments involve special
            types of risk, including limited marketability and the risks of
            being a lender. See "Illiquid Securities" for a discussion of the
            limits on the Fund's investments in loan participations and as-
            signments with limited marketability. If the Fund purchases a par-
            ticipation, it may only be able to enforce its rights through the
            lender, and may assume the credit risk of the lender in addition
            to the borrower. In assignments, the Fund's rights against the
            borrower may be more limited than those held by the original lend-
            er.
 
 
DELAYED
FUNDING     The Fund may also enter into, or acquire participations in, de-
LOANS AND   layed funding loans and revolving credit facilities. Delayed fund-
REVOLVING   ing loans and revolving credit facilities are borrowing arrange-
CREDIT      ments in which the lender agrees to make loans up to a maximum
FACILITIES  amount upon demand by the borrower during a specified term. A re-
            volving credit facility differs from a delayed funding loan in
            that as the borrower repays the loan, an amount equal to the re-
            payment may be borrowed again during the term of the revolving
            credit facility. These commitments may have the effect of requir-
            ing the Fund to
 PIMCO Funds: Pacific Investment Management Series
8
<PAGE>
 
            increase its investment in a company at a time when it might not
            otherwise decide to do so (including at a time when the company's
            financial condition makes it unlikely that such amounts will be
            repaid).
               
               The Fund may acquire a participation interest in delayed fund-
            ing loans or revolving credit facilities from a bank or other fi-
            nancial institution. See "Loan Participations and Assignments."
            The terms of the participation require the Fund to make a pro rata
            share of all loans extended to the borrower and entitles the Fund
            to a pro rata share of all payments made by the borrower. Delayed
            funding loans and revolving credit facilities usually provide for
            floating or variable rates of interest. To the extent that the
            Fund is committed to advance additional funds, it will at all
            times segregate assets, determined to be liquid by the Adviser in
            accordance with procedures established by the Board of Trustees,
            in an amount sufficient to meet such commitments.     
 
 
VARIABLE    Variable and floating rate securities provide for a periodic ad-
AND         justment in the interest rate paid on the obligations. The terms
FLOATING    of such obligations must provide that interest rates are adjusted
RATE        periodically based upon an interest rate adjustment index as pro-
SECURITIES  vided in the respective obligations. The adjustment intervals may
            be regular, and range from daily up to annually, or may be event
            based, such as based on a change in the prime rate.
               The Fund may engage in credit spread trades and invest in
            floating rate debt instruments ("floaters"). A credit spread trade
            is an investment position relating to a difference in the prices
            or interest rates of two securities or currencies, where the value
            of the investment position is determined by movements in the dif-
            ference between the prices or interest rates, as the case may be,
            of the respective securities or currencies. The interest rate on a
            floater is a variable rate which is tied to another interest rate,
            such as a money-market index or Treasury bill rate. The interest
            rate on a floater resets periodically, typically every six months.
            While, because of the interest rate reset feature, floaters pro-
            vide the Fund with a certain degree of protection against rises in
            interest rates, the Fund will participate in any declines in in-
            terest rates as well.
               The Fund may also invest in inverse floating rate debt instru-
            ments ("inverse floaters"). The interest rate on an inverse
            floater resets in the opposite direction from the market rate of
            interest to which the inverse floater is indexed. An inverse
            floating rate security may exhibit greater price volatility than a
            fixed rate obligation of similar credit quality. The Fund has
            adopted a policy under which the Fund will invest no more than 5%
            of its net assets in any combination of inverse floater, interest
            only ("IO"), or principal only ("PO") securities. See "Mortgage-
            Related and Other Asset-Backed Securities" for a discussion of IOs
            and POs.
 
 
INFLATION-  Inflation-indexed bonds are fixed income securities whose princi-
INDEXED     pal value is periodically adjusted according to the rate of infla-
BONDS       tion. The interest rate on these bonds is generally fixed at issu-
            ance at a rate lower than typical bonds. Over the life of an in-
            flation-indexed bond, however, interest will be paid based on a
            principal value which is adjusted for inflation.
               Inflation-indexed securities issued by the U.S. Treasury will
            initially have maturities of five or ten years, although it is an-
            ticipated that securities with other maturities will be issued in
            the future. The securities will pay interest on a semi-annual ba-
            sis, equal to a fixed percentage of the inflation-adjusted princi-
            pal amount. For example, if an investor purchased an inflation-in-
            dexed bond with a par value of $1,000 and a 3% real rate of return
            coupon (payable 1.5% semi-annually), and inflation over the first
            six months were 1%, the mid-year par value of the bond would be
            $1,010 and the first semi-annual interest payment would be $15.15
            ($1,010 times 1.5%). If inflation during the second half of the
            year reached 3%, the end-of-year par value of the bond would be
            $1,030 and the second semi-annual interest payment would be $15.45
            ($1,030 times 1.5%).
               If the periodic adjustment rate measuring inflation falls, the
            principal value of inflation-indexed bonds will be adjusted down-
            ward, and consequently the interest payable on these securities
            (calculated with respect to a smaller principal amount) will be
            reduced. Repayment of the original bond principal upon maturity
            (as adjusted for inflation) is guaranteed in the case of U.S.
            Treasury inflation-indexed bonds, even during a period of defla-
            tion. However, the current market value of the bonds is not guar-
            anteed, and will fluctuate. The Fund may also invest in other in-
            flation
                                                     August 1, 1998 Prospectus
                                                                               9
<PAGE>
 
            related bonds which may or may not provide a similar guarantee. If
            such a guarantee of principal is not provided, the adjusted prin-
            cipal value of the bond repaid at maturity may be less than the
            original principal.
               The value of inflation-indexed bonds is expected to change in
            response to changes in real interest rates. Real interest rates in
            turn are tied to the relationship between nominal interest rates
            and the rate of inflation. Therefore, if inflation were to rise at
            a faster rate than nominal interest rates, real interest rates
            might decline, leading to an increase in value of inflation-in-
            dexed bonds. In contrast, if nominal interest rates increased at a
            faster rate than inflation, real interest rates might rise, lead-
            ing to a decrease in value of inflation-indexed bonds.
               While these securities are expected to be protected from long-
            term inflationary trends, short-term increases in inflation may
            lead to a decline in value. If interest rates rise due to reasons
            other than inflation (for example, due to changes in currency ex-
            change rates), investors in these securities may not be protected
            to the extent that the increase is not reflected in the bond's in-
            flation measure.
               The U.S. Treasury has only recently begun issuing inflation-in-
            dexed bonds. As such, there is no trading history of these securi-
            ties, and there can be no assurance that a liquid market in these
            instruments will develop, although one is expected. Lack of a liq-
            uid market may impose the risk of higher transaction costs and the
            possibility the Fund may be forced to liquidate positions when it
            would not be advantageous to do so. There also can be no assurance
            that the U.S. Treasury will issue any particular amount of infla-
            tion-indexed bonds. Certain foreign governments, such as the
            United Kingdom, Canada and Australia, have a longer history of is-
            suing inflation-indexed bonds, and there may be a more liquid mar-
            ket in certain of these countries for these securities.
               The periodic adjustment of U.S. inflation-indexed bonds is tied
            to the Consumer Price Index for Urban Consumers ("CPI-U"), which
            is calculated monthly by the U.S. Bureau of Labor Statistics. The
            CPI-U is a measurement of changes in the cost of living, made up
            of components such as housing, food, transportation and energy.
            Inflation-indexed bonds issued by a foreign government are gener-
            ally adjusted to reflect a comparable inflation index, calculated
            by that government. There can be no assurance that the CPI-U or
            any foreign inflation index will accurately measure the real rate
            of inflation in the prices of goods and services. Moreover, there
            can be no assurance that the rate of inflation in a foreign coun-
            try will be correlated to the rate of inflation in the United
            States.
 
MORTGAGE-      
RELATED AND The Fund may invest all of its assets in mortgage- or other asset-
OTHER       backed securities. The value of some mortgage- or asset-backed se-
ASSET-      curities in which the Fund invests may be particularly sensitive
BACKED      to changes in prevailing interest rates, and, like the other in-
SECURITIES  vestments of the Fund, the ability of the Fund to successfully
            utilize these instruments may depend in part upon the ability of
            the Adviser to forecast interest rates and other economic factors
            correctly.     
 
            MORTGAGE-PASS-THROUGH SECURITIES are securities representing in-
            terests in "pools" of mortgage loans secured by residential or
            commercial real property in which payments of both interest and
            principal on the securities are generally made monthly, in effect
            "passing through" monthly payments made by the individual borrow-
            ers on the mortgage loans which underlie the securities (net of
            fees paid to the issuer or guarantor of the securities). Early re-
            payment of principal on some mortgage-related securities (arising
            from prepayments of principal due to sale of the underlying prop-
            erty, refinancing, or foreclosure, net of fees and costs which may
            be incurred) may expose the Fund to a lower rate of return upon
            reinvestment of principal. Also, if a security subject to prepay-
            ment has been purchased at a premium, the value of the premium
            would be lost in the event of prepayment. Like other fixed income
            securities, when interest rates rise, the value of a mortgage-re-
            lated security generally will decline; however, when interest
            rates are declining, the value of mortgage-related securities with
            prepayment features may not increase as much as other fixed income
            securities. The rate of prepayments on underlying mortgages will
            affect the price and volatility of a mortgage-related security,
            and may have the effect of shortening or extending the effective
            maturity of the security beyond what was anticipated at the time
            of purchase. To the extent that unanticipated rates of prepayment
            on underlying mortgages increase the effective maturity of a mort-
            gage-related security, the volatility of such security can be ex-
            pected to increase.
               Payment of principal and interest on some mortgage pass-through
            securities (but not the market value of the securities themselves)
            may be guaranteed by the full faith and credit of the U.S. Govern-
            ment (in the case of securities guaranteed by GNMA); or guaranteed
            by agencies or instrumentalities of the U.S. Government (in the
            case of securi-
 
10
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            ties guaranteed by FNMA or the Federal Home Loan Mortgage Corpora-
            tion ("FHLMC"), which are supported only by the discretionary au-
            thority of the U.S. Government to purchase the agency's obliga-
            tions). Mortgage-related securities created by non-governmental
            issuers (such as commercial banks, savings and loan institutions,
            private mortgage insurance companies, mortgage bankers and other
            secondary market issuers) may be supported by various forms of in-
            surance or guarantees, including individual loan, title, pool and
            hazard insurance and letters of credit, which may be issued by
            governmental entities, private insurers or the mortgage poolers.
 
            COLLATERALIZED MORTGAGE OBLIGATIONS ("CMOs") are hybrid mortgage-
            related instruments. Interest and pre-paid principal on a CMO are
            paid, in most cases, on a monthly basis. CMOs may be collateral-
            ized by whole mortgage loans but are more typically collateralized
            by portfolios of mortgage pass-through securities guaranteed by
            GNMA, FHLMC, or FNMA. CMOs are structured into multiple classes,
            with each class bearing a different stated maturity. Monthly pay-
            ments of principal, including prepayments, are first returned to
            investors holding the shortest maturity class; investors holding
            the longer maturity classes receive principal only after the first
            class has been retired. CMOs that are issued or guaranteed by the
            U.S. Government or by any of its agencies or instrumentalities
            will be considered U.S. Government securities by the Fund, while
            other CMOs, even if collateralized by U.S. Government securities,
            will have the same status as other privately issued securities for
            purposes of applying the Fund's diversification tests.
 
            COMMERCIAL MORTGAGE-BACKED SECURITIES include securities that re-
            flect an interest in, and are secured by, mortgage loans on com-
            mercial real property. The market for commercial mortgage-backed
            securities developed more recently and in terms of total outstand-
            ing principal amount of issues is relatively small compared to the
            market for residential single-family mortgage-backed securities.
            Many of the risks of investing in commercial mortgage-backed secu-
            rities reflect the risks of investing in the real estate securing
            the underlying mortgage loans. These risks reflect the effects of
            local and other economic conditions on real estate markets, the
            ability of tenants to make loan payments, and the ability of a
            property to attract and retain tenants. Commercial mortgage-backed
            securities may be less liquid and exhibit greater price volatility
            than other types of mortgage-related or asset-backed securities.
 
            MORTGAGE-RELATED SECURITIES include securities other than those
            described above that directly or indirectly represent a participa-
            tion in, or are secured by and payable from, mortgage loans on
            real property, such as mortgage dollar rolls (see "Reverse Repur-
            chase Agreements, Dollar Rolls, and Borrowings"), CMO residuals or
            stripped mortgage-backed securities ("SMBS"), and may be struc-
            tured in classes with rights to receive varying proportions of
            principal and interest.
               A common type of SMBS will have one class receiving some of the
            interest and most of the principal from the mortgage assets, while
            the other class will receive most of the interest and the remain-
            der of the principal. In the most extreme case, one class will re-
            ceive all of the interest (the interest-only, or "IO" class),
            while the other class will receive all of the principal (the prin-
            cipal-only, or "PO" class). The yield to maturity on an IO class
            is extremely sensitive to the rate of principal payments (includ-
            ing prepayments) on the related underlying mortgage assets, and a
            rapid rate of principal payments may have a material adverse ef-
            fect on the Fund's yield to maturity from these securities. The
            Fund has adopted a policy under which the Fund will invest no more
            than 5% of its net assets in any combination of IO, PO, or inverse
            floater securities. The Fund may invest in other asset-backed se-
            curities that have been offered to investors. For a discussion of
            the characteristics of some of these instruments, see the State-
            ment of Additional Information.
 
 
REPURCHASE
AGREEMENTS  For the purpose of achieving income, the Fund may enter into re-
            purchase agreements, which entail the purchase of a portfolio-eli-
            gible security from a bank or broker-dealer that agrees to repur-
            chase the security at the Fund's cost plus interest within a spec-
            ified time (normally one day). If the party agreeing to repurchase
            should default, as a result of bankruptcy or otherwise, the Fund
            will seek to sell the securities which it holds, which action
            could involve procedural costs or delays in addition to a loss on
            the securities if their value should fall below their repurchase
            price. The Fund will invest no more than 15% of its net assets
            (taken at current market value) in repurchase agreements maturing
            in more than seven days.
 
                                                                             11
                                                     August 1, 1998 Prospectus
<PAGE>
 
 
 
REVERSE        
REPURCHASE  A reverse repurchase agreement involves the sale of a security by
AGREEMENTS, the Fund and its agreement to repurchase the instrument at a spec-
DOLLAR      ified time and price. Under a reverse repurchase agreement, the
ROLLS, AND  Fund continues to receive any principal and interest payments on
BORROWINGS  the underlying security during the term of the agreement. The Fund
            generally will segregate assets determined to be liquid by the Ad-
            viser in accordance with procedures established by the Board of
            Trustees to cover its obligations under reverse repurchase agree-
            ments and, to this extent, a reverse repurchase agreement (or eco-
            nomically similar transaction) will not be considered a "senior
            security" subject to the 300% asset coverage requirements other-
            wise applicable to borrowings by the Fund.     
               
               The Fund may enter into dollar rolls, in which the Fund sells
            mortgage-backed or other securities for delivery in the current
            month and simultaneously contracts to purchase substantially simi-
            lar securities on a specified future date. In the case of dollar
            rolls involving mortgage-backed securities, the mortgage-backed
            securities that are purchased will be of the same type and will
            have the same interest rate as those sold, but will be supported
            by different pools of mortgages. The Fund forgoes principal and
            interest paid during the roll period on the securities sold in a
            dollar roll, but the Fund is compensated by the difference between
            the current sales price and the lower price for the future pur-
            chase as well as by any interest earned on the proceeds of the se-
            curities sold. The Fund also could be compensated through the re-
            ceipt of fee income equivalent to a lower forward price. The Fund
            will segregate assets determined to be liquid by the Adviser in
            accordance with procedures established by the Board of Trustees to
            cover its obligations under dollar rolls.     
               
               To the extent that positions in reverse repurchase agreements,
            dollar rolls or similar transactions are not covered through the
            maintenance of segregated liquid assets at least equal to the
            amount of any forward purchase commitment, such transactions would
            be subject to the Fund's limitations on borrowings, which would
            restrict the aggregate of such transactions (plus any other
            borrowings) to 33 1/3% of the Fund's total assets. Apart from such
            transactions, the Fund will not borrow money, except for temporary
            administrative purposes.     
 
 
LOANS OF    For the purpose of achieving income, the Fund may lend its portfo-
PORTFOLIO   lio securities to brokers, dealers, and other financial institu-
SECURITIES  tions, provided:
            (i)  the loan is secured continuously by collateral consisting of
                 U.S. Government securities, cash or cash equivalents (nego-
                 tiable certificates of deposit, bankers' acceptances or let-
                 ters of credit) maintained on a daily mark-to-market basis in
                 an amount at least equal to the current market value of the
                 securities loaned;
            (ii)the Fund may at any time call the loan and obtain the return
            of the securities loaned;
            (iii)the Fund will receive any interest or dividends paid on the
            loaned securities; and
            (iv) the aggregate market value of securities loaned will not at
                 any time exceed 33 1/3% of the total assets of the Fund.
            The Fund's performance will continue to reflect changes in the
            value of the securities loaned and will also reflect the receipt
            of either interest, through investment of cash collateral by the
            Fund in permissible investments, or a fee, if the collateral is
            U.S. Government securities. Securities lending involves the risk
            of loss of rights in the collateral or delay in recovery of the
            collateral should the borrower fail to return the security loaned
            or become insolvent. The Fund may pay lending fees to the party
            arranging the loan.
 
 
WHEN-
ISSUED,        
DELAYED     The Fund may purchase or sell securities on a when-issued, delayed
DELIVERY    delivery, or forward commitment basis. These transactions involve
AND FORWARD a commitment by the Fund to purchase or sell securities for a pre-
COMMITMENT  determined price or yield, with payment and delivery taking place
TRANSACTIONSmore than seven days in the future, or after a period longer than
            the customary settlement period for that type of security. When
            such purchases are outstanding, the Fund will segregate until the
            settlement date assets determined to be liquid by the Adviser in
            accordance with procedures established by the Board of Trustees,
            in an amount sufficient to meet the purchase price. Typically, no
            income accrues on securities the Fund has committed to purchase
            prior to the time delivery of the securities is made, although the
            Fund may earn income on securities it has segregated.     
 
12
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               When purchasing a security on a when-issued, delayed delivery,
            or forward commitment basis, the Fund assumes the rights and risks
            of ownership of the security, including the risk of price and
            yield fluctuations, and takes such fluctuations into account when
            determining its net asset value. Because the Fund is not required
            to pay for the security until the delivery date, these risks are
            in addition to the risks associated with the Fund's other invest-
            ments. If the Fund remains substantially fully invested at a time
            when when-issued, delayed delivery, or forward commitment pur-
            chases are outstanding, the purchases may result in a form of lev-
            erage.
               
               When the Fund has sold a security on a when-issued, delayed de-
            livery, or forward commitment basis, the Fund does not participate
            in future gains or losses with respect to the security. If the
            other party to a transaction fails to deliver or pay for the secu-
            rities, the Fund could miss a favorable price or yield opportunity
            or could suffer a loss. The Fund may dispose of or renegotiate a
            transaction after it is entered into, and may sell when-issued,
            delayed delivery or forward commitment securities before they are
            delivered, which may result in a capital gain or loss. There is no
            percentage limitation on the extent to which the Fund may purchase
            or sell securities on a when-issued, delayed delivery, or forward
            commitment basis.     
 
 
SHORT SALES    
            The Fund may from time to time effect short sales as part of its
            overall portfolio management strategies, including the use of de-
            rivative instruments, or to offset potential declines in value of
            long positions in similar securities as those sold short. A short
            sale (other than a short sale against the box) is a transaction in
            which the Fund sells a security it does not own at the time of the
            sale in anticipation that the market price of that security will
            decline. To the extent that the Fund engages in short sales, it
            must (except in the case of short sales "against the box") main-
            tain asset coverage in the form of segregated assets determined to
            be liquid by the Adviser in accordance with procedures established
            by the Board of Trustees or otherwise cover its position in a per-
            missible manner. A short sale is "against the box" to the extent
            that the Fund contemporaneously owns, or has the right to obtain
            at no added cost, securities identical to those sold short.     
 
 
FOREIGN     The Fund may invest directly in fixed income securities of non-
SECURITIES  U.S. issuers. The Fund will concentrate its foreign investments in
            securities of issuers based in developed countries; however, the
            Fund may invest up to 10% of its assets in securities of issuers
            based in emerging market countries.
               Individual foreign economies may differ favorably or unfavor-
            ably from the U.S. economy in such respects as growth of gross do-
            mestic product, rate of inflation, capital reinvestment, re-
            sources, self-sufficiency and balance of payments positions. The
            securities markets, values of securities, yields and risks associ-
            ated with securities markets in differ- ent countries may change
            independently of each other. Investing in the securities of is-
            suers in any foreign country involves special risks and considera-
            tions not typically associated with investing in U.S. companies.
            Shareholders should consider carefully the substantial risks in-
            volved in investing in securities issued by companies and govern-
            ments of foreign nations. These risks include: differences in ac-
            counting, auditing and financial reporting standards; generally
            higher commission rates on foreign portfolio transactions; the
            possibility of nationalization, expropriation or confiscatory tax-
            ation; adverse changes in investment or exchange control regula-
            tions (which may include suspension of the ability to transfer
            currency from a country); and political instability which could
            affect U.S. investments in foreign countries. Additionally, for-
            eign securities and dividends and interest payable on those secu-
            rities may be subject to foreign taxes, including taxes withheld
            from payments on those securities. Foreign securities often trade
            with less frequency and volume than domestic securities and there-
            fore may exhibit greater price volatility. Additional costs asso-
            ciated with an investment in foreign securities may include higher
            custodial fees than apply to domestic custodial arrangements and
            transaction costs of foreign currency conversions. Changes in for-
            eign exchange rates also will affect the value of securities de-
            nominated or quoted in currencies other than the U.S. dollar.
               The Fund may invest in the securities of issuers based in coun-
            tries with developing economies. Investing in developing (or
            "emerging market") countries involves certain risks not typically
            associated with investing in U.S. securities, and imposes risks
            greater than, or in addition to, risks of investing in foreign,
            developed countries. A number of emerging market countries re-
            strict, to varying degrees, foreign investment in securities. Re-
            patriation of investment
 
                                                                             13
                                                     August 1, 1998 Prospectus
<PAGE>
 
            income, capital, and the proceeds of sales by foreign investors
            may require governmental registration and/or approval in some
            emerging market countries. A number of the currencies of emerging
            market countries have experienced significant declines against the
            U.S. dollar in recent years, and devaluation may occur subsequent
            to investment in these currencies by the Fund. Inflation and rapid
            fluctuations in inflation rates have had, and may continue to
            have, negative effects on the economies and securities markets of
            certain emerging market countries. Many of the emerging securities
            markets are relatively small, have low trading volumes, suffer pe-
            riods of relative illiquidity, and are characterized by signifi-
            cant price volatility. There is a risk in emerging market coun-
            tries that a future economic or political crisis could lead to
            price controls, forced mergers of companies, expropriation or con-
            fiscatory taxation, seizure, nationalization, or creation of gov-
            ernment monopolies, any of which may have a detrimental effect on
            the Fund's investment.
               Additional risks of investing in emerging market countries may
            include: currency exchange rate fluctuations; greater social, eco-
            nomic and political uncertainty and instability (including the
            risk of war); more substantial governmental involvement in the
            economy; less governmental supervision and regulation of the secu-
            rities markets and participants in those markets; unavailability
            of currency hedging techniques in certain emerging market coun-
            tries; the fact that companies in emerging market countries may be
            newly organized and may be smaller and less seasoned companies;
            the difference in, or lack of, auditing and financial reporting
            standards, which may result in unavailability of material informa-
            tion about issuers; the risk that it may be more difficult to ob-
            tain and/or enforce a judgment in a court outside the United
            States; and significantly smaller market capitalization of securi-
            ties markets. Also, any change in the leadership or policies of
            Eastern European countries, or the countries that exercise a sig-
            nificant influence over those countries, may halt the expansion of
            or reverse the liberalization of foreign investment policies now
            occurring and adversely affect existing investment opportunities.
               Emerging securities markets may have different clearance and
            settlement procedures, which may be unable to keep pace with the
            volume of securities transactions or otherwise make it difficult
            to engage in such transactions. Settlement problems may cause the
            Fund to miss attractive investment opportunities, hold a portion
            of its assets in cash pending investment, or delay in disposing of
            a portfolio security. Such a delay could result in possible lia-
            bility to a purchaser of the security.
               The Fund may invest in Brady Bonds, which are securities cre-
            ated through the exchange of existing commercial bank loans to
            sovereign entities for new obligations in connection with debt
            restructurings under a debt restructuring plan introduced by for-
            mer U.S. Secretary of the Treasury, Nicholas F. Brady. Brady Bonds
            have been issued only recently, and for that reason do not have a
            long payment history. Brady Bonds may be collateralized or
            uncollateralized, are issued in various currencies (but primarily
            the U.S. dollar), and are actively traded in the over-the-counter
            secondary market. Brady Bonds are not considered to be U.S. Gov-
            ernment securities. In light of the residual risk of Brady Bonds
            and, among other factors, the history of defaults with respect to
            commercial bank loans by public and private entities in countries
            issuing Brady Bonds, investments in Brady Bonds may be viewed as
            speculative. There can be no assurance that Brady Bonds acquired
            by the Fund will not be subject to restructuring arrangements or
            to requests for new credit, which may cause the Fund to suffer a
            loss of interest or principal on any of its holdings. For further
            information, see the Statement of Additional Information.
               The Fund's investments in foreign currency denominated debt ob-
            ligations and hedging activities will likely produce a difference
            between its book income and its taxable income. This difference
            may cause a portion of the Fund's income distributions to consti-
            tute returns of capital for tax purposes or require the Fund to
            make distributions exceeding book income to qualify as a regulated
            investment company for federal tax purposes.
 
 
FOREIGN
CURRENCY    Foreign currency exchange rates may fluctuate significantly over
TRANSACTIONSshort periods of time. They generally are determined by the forces
            of supply and demand in the foreign exchange markets and the rela-
            tive merits of investments in different countries, actual or per-
            ceived changes in interest rates and other complex factors, as
            seen from an international perspective. Currency exchange rates
            also can be affected unpredictably by intervention (or the failure
            to intervene) by U.S. or foreign governments or central banks, by
            currency controls or political developments in the U.S. or abroad.
            For example, significant uncertainty surrounds the proposed
            intoduction of the euro (a common currency unit for the European
 
14
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Union) in January 1999 and its effect on the value of securities
            denominated in local European currencies. These and other curren-
            cies in which the Fund's assets are denominated may be devalued
            against the U.S. dollar, resulting in a loss to the Fund.
               
               The Fund may buy and sell foreign currencies on a spot and for-
            ward basis to reduce the risks of adverse changes in foreign ex-
            change rates. A forward foreign currency exchange contract in-
            volves an obligation to purchase or sell a specific currency at a
            future date, which may be any fixed number of days from the date
            of the contract agreed upon by the parties, at a price set at the
            time of the contract. By entering into a forward foreign currency
            exchange contract, the Fund "locks in" the exchange rate between
            the currency it will deliver and the currency it will receive for
            the duration of the contract. As a result, the Fund reduces its
            exposure to changes in the value of the currency it will deliver
            and increases its exposure to changes in the value of the currency
            it will exchange into. The effect on the value of the Fund is sim-
            ilar to selling securities denominated in one currency and pur-
            chasing securities denominated in another. Contracts to sell for-
            eign currency would limit any potential gain which might be real-
            ized by the Fund if the value of the hedged currency increases.
            The Fund may enter into these contracts for the purpose of hedging
            against foreign exchange risk arising from the Fund's investment
            or anticipated investment in securities denominated in foreign
            currencies. The Fund also may enter into these contracts for pur-
            poses of increasing exposure to a foreign currency or to shift ex-
            posure to foreign currency fluctuations from one country to anoth-
            er. The Fund may use one currency (or a basket of currencies) to
            hedge against adverse changes in the value of another currency (or
            a basket of currencies) when exchange rates between the two cur-
            rencies are positively correlated. The Fund will segregate assets
            determined to be liquid by the Adviser in accordance with proce-
            dures established by the Board of Trustees, to cover its obliga-
            tions under forward foreign currency exchange contracts entered
            into for non-hedging purposes.     
               The Fund may invest in options on foreign currencies and for-
            eign currency futures and options thereon. The Fund also may in-
            vest in foreign currency exchange-related securities, such as for-
            eign currency warrants and other instruments whose return is
            linked to foreign currency exchange rates. The Fund will use these
            techniques to hedge at least 75% of its exposure to foreign cur-
            rency. For a description of these instruments, see "Derivative In-
            struments" below and the Statement of Additional Information.
 
 
HIGH YIELD  The Fund may invest up to 10% of its assets in fixed income secu-
SECURITIES  rities rated lower than Baa by Moody's or lower than BBB by S&P
("JUNK      but rated at least B by Moody's or S&P (or, if not rated, of com-
BONDS")     parable quality). Securities rated lower than Baa by Moody's or
            lower than BBB by S&P are sometimes referred to as "high yield" or
            "junk" bonds. Securities rated Baa are considered by Moody's to
            have some speculative characteristics. Investors should consider
            the following risks associated with high yield securities before
            investing in the Fund.
               Investing in high yield securities involves special risks in
            addition to the risks associated with investments in higher rated
            fixed income securities. High yield securities may be regarded as
            predominately speculative with respect to the issuer's continuing
            ability to meet principal and interest payments. Analysis of the
            creditworthiness of issuers of high yield securities may be more
            complex than for issuers of higher quality debt securities, and
            the ability of the Fund to achieve its investment objective may,
            to the extent of its investments in high yield securities, be more
            dependent upon such creditworthiness analysis than would be the
            case if the Fund were investing in higher quality securities.
               High yield securities may be more susceptible to real or per-
            ceived adverse economic and competitive industry conditions than
            higher grade securities. The prices of high yield securities have
            been found to be less sensitive to interest rate changes than more
            highly rated investments, but more sensitive to adverse economic
            downturns or individual corporate developments. A projection of an
            economic downturn or of a period of rising interest rates, for ex-
            ample, could cause a decline in high yield security prices because
            the advent of a recession could lessen the ability of a highly
            leveraged company to make principal and interest payments on its
            debt securities. If the issuer of high yield securities defaults,
            the Fund may incur additional expenses to seek recovery. In the
            case of high yield securities structured as zero coupon or pay-
            ment-in-kind securities, the market prices of such securities are
            affected to a greater extent by interest rate changes, and there-
            fore tend to be more volatile than securities which pay interest
            periodically and in cash.
                                                     August 1, 1998 Prospectus
                                                                              15
<PAGE>
 
               The secondary markets on which high yield securities are traded
            may be less liquid than the market for higher grade securities.
            Less liquidity in the secondary trading markets could adversely
            affect and cause large fluctuations in the daily net asset value
            of the Fund's shares. Adverse publicity and investor perceptions,
            whether or not based on fundamental analysis, may decrease the
            values and liquidity of high yield securities, especially in a
            thinly traded market.
               
               The use of credit ratings as the sole method of evaluating high
            yield securities can involve certain risks. For example, credit
            ratings evaluate the safety of principal and interest payments,
            not the market value risk of high yield securities. Also, credit
            rating agencies may fail to change credit ratings in a timely
            fashion to reflect events since the security was last rated. The
            Adviser does not rely solely on credit ratings when selecting se-
            curities for the Fund, and develops its own independent analysis
            of issuer credit quality. If a credit rating agency changes the
            rating of a portfolio security held by the Fund, the Fund may re-
            tain the portfolio security if the Adviser deems it in the best
            interest of shareholders.     
               
               During the year ended March 31, 1998, based upon the dollar-
            weighted average ratings of the Fund's portfolio holdings at the
            end of each month in the Fund's fiscal year, the Fund had the fol-
            lowing percentages of its net assets invested in securities rated
            in the categories indicated as rated by Moody's (or, if unrated,
            determined by the Adviser to be of comparable quality). See "Ap-
            pendix B--Description of Securities Ratings," for further informa-
            tion.     
 
 
              FIXED INCOME SECURITIES RATINGS
 
<TABLE>   
           <S>         <C>       <C>       <C>       <C>           <C>       <C>       <C>
                                                     Below
           Prime 1     Aaa       Aa        A         Prime 1       Baa       Ba        B
              ----------------------------------------------------------------------------
<CAPTION>
           20%         47%       0%        13%       6%            8%        6%        0%
</TABLE>    
               
               These figures are intended solely to provide disclosure about
            the Fund's asset composition during its most recent fiscal year.
            The asset composition after this time may or may not be approxi-
            mately the same as represented by such figures. In addition, the
            categories reflect ratings by Moody's, and ratings assigned by S&P
            may not be consistent with ratings assigned by Moody's or other
            credit ratings services, and the Adviser may not necessarily agree
            with a rating assigned by any credit rating agency.     
 
 
DERIVATIVE     
INSTRUMENTS The Fund may purchase and write call and put options on securi-
            ties, securities indexes and foreign currencies, and enter into
            futures contracts and use options on futures contracts as further
            described below. The Fund also may enter into swap agreements with
            respect to foreign currencies, interest rates, and securities in-
            dexes. The Fund may use these techniques to hedge against changes
            in interest rates, foreign currency exchange rates or securities
            prices or as part of its overall investment strategies. The Fund
            may also purchase and sell options relating to foreign currencies
            for purposes of increasing exposure to a foreign currency or to
            shift exposure to foreign currency fluctuations from one country
            to another. The Fund will segregate assets determined to be liquid
            by the Adviser in accordance with procedures established by the
            Board of Trustees (or, as permitted by applicable regulation, en-
            ter into certain offsetting positions) to cover its obligations
            under options, futures, and swaps to avoid leveraging of the Fund.
                   
               The Fund considers derivative instruments to consist of securi-
            ties or other instruments whose value is derived from or related
            to the value of some other instrument or asset, and not to include
            those securities whose payment of principal and/or interest de-
            pends upon cash flows from underlying assets, such as mortgage-re-
            lated or asset-backed securities. The Fund may invest all of its
            assets in derivative instruments.The value of some derivative in-
            struments in which the Fund invests may be particularly sensitive
            to changes in prevailing interest rates, and, like the other in-
            vestments of the Fund, the ability of the Fund to successfully
            utilize these instruments may depend in part upon the ability of
            the Adviser to forecast interest rates and other economic factors
            correctly. If the Adviser incorrectly forecasts such factors and
            has taken positions in derivative instruments contrary to prevail-
            ing market trends, the Fund could be exposed to the risk of loss.
                
16
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
               The Fund might not employ any of the strategies described be-
            low, and no assurance can be given that any strategy used will
            succeed. If the Adviser incorrectly forecasts interest rates, mar-
            ket values or other economic factors in utilizing a derivatives
            strategy for the Fund, the Fund might have been in a better posi-
            tion if it had not entered into the transaction at all. The use of
            these strategies involves certain special risks, including a pos-
            sible imperfect correlation, or even no correlation, between price
            movements of derivative instruments and price movements of related
            investments. While some strategies involving derivative instru-
            ments can reduce the risk of loss, they can also reduce the oppor-
            tunity for gain or even result in losses by offsetting favorable
            price movements in related investments, or due to the possible in-
            ability of the Fund to purchase or sell a portfolio security at a
            time that otherwise would be favorable for it to do so, or the
            possible need for the Fund to sell a portfolio security at a dis-
            advantageous time, because the Fund is required to maintain asset
            coverage or offsetting positions in connection with transactions
            in derivative instruments, and the possible inability of the Fund
            to close out or to liquidate its derivatives positions.     
 
            OPTIONS ON SECURITIES, SECURITIES INDEXES, AND CURRENCIES The Fund
            may purchase put options on securities and indexes. One purpose of
            purchasing put options is to protect holdings in an underlying or
            related security against a substantial decline in market value.
            The Fund may also purchase call options on securities and indexes.
            One purpose of purchasing call options is to protect against sub-
            stantial increases in prices of securities the Fund intends to
            purchase pending its ability to invest in such securities in an
            orderly manner. An option on a security (or index) is a contract
            that gives the holder of the option, in return for a premium, the
            right to buy from (in the case of a call) or sell to (in the case
            of a put) the writer of the option the security underlying the op-
            tion (or the cash value of the index) at a specified exercise
            price at any time during the term of the option. The writer of an
            option on a security has the obligation upon exercise of the op-
            tion to deliver the underlying security upon payment of the exer-
            cise price or to pay the exercise price upon delivery of the un-
            derlying security. Upon exercise, the writer of an option on an
            index is obligated to pay the difference between the cash value of
            the index and the exercise price multiplied by the specified mul-
            tiplier for the index option. An index is designed to reflect
            specified facets of a particular financial or securities market, a
            specific group of financial instruments or securities, or certain
            economic indicators.
               The Fund may sell put or call options it has previously pur-
            chased, which could result in a net gain or loss depending on
            whether the amount realized on the sale is more or less than the
            premium and other transaction costs paid on the put or call option
            which is sold. The Fund may write a call or put option only if the
            option is "covered" by the Fund holding a position in the under-
            lying securities or by other means which would permit immediate
            satisfaction of the Fund's obligation as writer of the option.
            Prior to exercise or expiration, an option may be closed out by an
            offsetting purchase or sale of an option of the same series.
               The Fund may write covered straddles consisting of a combina-
            tion of a call and a put written on the same underlying security.
            A straddle will be covered when sufficient assets are deposited to
            meet the Fund's immediate obligations. The Fund may use the same
            liquid assets to cover both the call and put options where the ex-
            ercise price of the call and put are the same, or the exercise
            price of the call is higher than that of the put. In such cases,
            the Fund will also segregate liquid assets equivalent to the
            amount, if any, by which the put is "in the money."
               The purchase and writing of options involves certain risks.
            During the option period, the covered call writer has, in return
            for the premium on the option, given up the opportunity to profit
            from a price increase in the underlying security above the exer-
            cise price, but, as long as its obligation as a writer continues,
            has retained the risk of loss should the price of the underlying
            security decline. The writer of an option has no control over the
            time when it may be required to fulfill its obligation as a writer
            of the option. Once an option writer has received an exercise no-
            tice, it cannot effect a closing purchase transaction in order to
            terminate its obligation under the option and must deliver the un-
            derlying security at the exercise price. If a put or call option
            purchased by the Fund is not sold when it has remaining value, and
            if the market price of the underlying security remains equal to or
            greater than the exercise price (in the case of a put), or remains
            less than or equal to the exercise price (in the case of a call),
            the Fund will lose its entire investment in the option. Also,
            where a put or call option on a particular security is purchased
            to hedge against price
                                                     August 1, 1998 Prospectus
                                                                              17
<PAGE>
 
            movements in a related security, the price of the put or call op-
            tion may move more or less than the price of the related security.
            There can be no assurance that a liquid market will exist when the
            Fund seeks to close out an option position. Furthermore, if trad-
            ing restrictions or suspensions are imposed on the options mar-
            kets, the Fund may be unable to close out a position.
               The Fund may buy or sell put and call options on foreign cur-
            rencies. Currency options traded on U.S. or other exchanges may be
            subject to position limits which may limit the ability of the Fund
            to reduce foreign currency risk using such options. Over-the-
            counter options differ from traded options in that they are two-
            party contracts, with price and other terms negotiated between
            buyer and seller, and generally do not have as much market liquid-
            ity as exchange-traded options. The Fund may be required to treat
            as illiquid over-the-counter options purchased and securities be-
            ing used to cover certain written over-the-counter options.
 
            SWAP AGREEMENTS The Fund may enter into interest rate, index, eq-
            uity and currency exchange rate swap agreements. These transac-
            tions would be entered into in an attempt to obtain a particular
            return when it is considered desirable to do so, possibly at a
            lower cost to the Fund than if the Fund had invested directly in
            the asset that yielded the desired return. Swap agreements are
            two-party contracts entered into primarily by institutional in-
            vestors for periods ranging from a few weeks to more than one
            year. In a standard swap transaction, two parties agree to ex-
            change the returns (or differentials in rates of return) earned or
            realized on particular predetermined investments or instruments,
            which may be adjusted for an interest factor. The gross returns to
            be exchanged or "swapped" between the parties are generally calcu-
            lated with respect to a "notional amount," i.e., the return on or
            increase in value of a particular dollar amount invested at a par-
            ticular interest rate, in a particular foreign currency, or in a
            "basket" of securities representing a particular index. Forms of
            swap agreements include interest rate caps, under which, in return
            for a premium, one party agrees to make payments to the other to
            the extent that interest rates exceed a specified rate, or "cap";
            interest rate floors, under which, in return for a premium, one
            party agrees to make payments to the other to the extent that in-
            terest rates fall below a specified level, or "floor"; and inter-
            est rate collars, under which a party sells a cap and purchases a
            floor or vice versa in an attempt to protect itself against inter-
            est rate movements exceeding given minimum or maximum levels.
               
               Most swap agreements entered into by the Fund calculate the ob-
            ligations of the parties to the agreement on a "net basis." Conse-
            quently, the Fund's current obligations (or rights) under a swap
            agreement will generally be equal only to the net amount to be
            paid or received under the agreement based on the relative values
            of the positions held by each party to the agreement (the "net
            amount"). The Fund's current obligations under a swap agreement
            will be accrued daily (offset against amounts owed to the Fund),
            and any accrued but unpaid net amounts owed to a swap counterparty
            will be covered by the segregation of assets determined to be liq-
            uid by the Adviser in accordance with procedures established by
            the Board of Trustees, to limit any potential leveraging of the
            Fund's portfolio. Obligations under swap agreements so covered
            will not be construed to be "senior securities" for purposes of
            the Fund's investment restriction concerning senior securities.
            The Fund will not enter into a swap agreement with any single
            party if the net amount owed or to be received under existing con-
            tracts with that party would exceed 5% of the Fund's assets.     
               
               Whether the Fund's use of swap agreements will be successful in
            furthering its investment objective will depend on the Adviser's
            ability to predict correctly whether certain types of investments
            are likely to produce greater returns than other investments. Be-
            cause they are two-party contracts and because they may have terms
            of greater than seven days, swap agreements may be considered to
            be illiquid investments. Moreover, the Fund bears the risk of loss
            of the amount expected to be received under a swap agreement in
            the event of the default or bankruptcy of a swap agreement
            counterparty. The Fund will enter into swap agreements only with
            counterparties that meet certain standards for creditworthiness
            (generally, such counterparties would have to be eligible
            counterparties under the terms of the Fund's repurchase agreement
            guidelines). Certain restrictions imposed on the Fund by the In-
            ternal Revenue Code may limit the Fund's ability to use swap
            agreements. The swaps market is a relatively new market and is
            largely unregulated. It is     
 
18
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            possible that developments in the swaps market, including poten-
            tial government regulation, could adversely affect the Fund's
            ability to terminate existing swap agreements or to realize
            amounts to be received under such agreements.
 
            FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS The Fund may
            invest in interest rate futures contracts and options thereon
            ("futures options"), and to the extent it may invest in foreign
            currency-denominated securities, may also invest in foreign cur-
            rency futures contracts and options thereon.
               There are several risks associated with the use of futures and
            futures options for hedging purposes. There can be no guarantee
            that there will be a correlation between price movements in the
            hedging vehicle and in the portfolio securities being hedged. An
            incorrect correlation could result in a loss on both the hedged
            securities in the Fund and the hedging vehicle, so that the port-
            folio return might have been greater had hedging not been attempt-
            ed. There can be no assurance that a liquid market will exist at a
            time when the Fund seeks to close out a futures contract or a
            futures option position. Most futures exchanges and boards of
            trade limit the amount of fluctuation permitted in futures con-
            tract prices during a single day; once the daily limit has been
            reached on a particular contract, no trades may be made that day
            at a price beyond that limit. In addition, certain of these in-
            struments are relatively new and without a significant trading
            history. As a result, there is no assurance that an active second-
            ary market will develop or continue to exist. Lack of a liquid
            market for any reason may prevent the Fund from liquidating an un-
            favorable position, and the Fund would remain obligated to meet
            margin requirements until the position is closed.
               The Fund may write covered straddles consisting of a call and a
            put written on the same underlying futures contract. A straddle
            will be covered when sufficient assets are deposited to meet the
            Fund's immediate obligations. The Fund may use the same liquid as-
            sets to cover both the call and put options where the exercise
            price of the call and put are the same, or the exercise price of
            the call is higher than that of the put. In such cases, the Fund
            will also segregate liquid assets equivalent to the amount, if
            any, by which the put is "in the money."
               The Fund will only enter into futures contracts or futures op-
            tions which are standardized and traded on a U.S. or foreign ex-
            change or board of trade, or similar entity, or quoted on an auto-
            mated quotation system. The Fund will use financial futures con-
            tracts and related options only for "bona fide hedging" purposes,
            as such term is defined in applicable regulations of the Commodity
            Futures Trading Commission ("CFTC") or, with respect to positions
            in financial futures and related options that do not qualify as
            "bona fide hedging" positions, will enter such positions only to
            the extent that aggregate initial margin deposits plus premiums
            paid by it for open futures option positions, less the amount by
            which any such positions are "in-the-money," would not exceed 5%
            of the Fund's net assets.
 
 
HYBRID      A hybrid instrument can combine the characteristics of securities,
INSTRUMENTS futures, and options. For example, the principal amount or inter-
            est rate of a hybrid could be tied (positively or negatively) to
            the price of some commodity, currency or securities index or an-
            other interest rate (each a "benchmark"). The interest rate or
            (unlike most fixed income securities) the principal amount payable
            at maturity of a hybrid security may be increased or decreased,
            depending on changes in the value of the benchmark.
               Hybrids can be used as an efficient means of pursuing a variety
            of investment goals, including currency hedging, duration manage-
            ment, and increased total return. Hybrids may not bear interest or
            pay dividends. The value of a hybrid or its interest rate may be a
            multiple of a benchmark and, as a result, may be leveraged and
            move (up or down) more steeply and rapidly than the benchmark.
            These benchmarks may be sensitive to economic and political
            events, such as commodity shortages and currency devaluations,
            which cannot be readily foreseen by the purchaser of a hybrid. Un-
            der certain conditions, the redemption value of a hybrid could be
            zero. Thus, an investment in a hybrid may entail significant mar-
            ket risks that are not associated with a similar investment in a
            traditional, U.S. dollar-denominated bond that has a fixed princi-
            pal amount and pays a fixed rate or floating rate of interest. The
            purchase of hybrids also exposes the Fund to the credit risk of
            the issuer of the hybrids. These risks may cause significant fluc-
            tuations in the net asset value of the Fund. Accordingly, the Fund
            will invest no more than 5% of its assets in hybrid instruments.
 
                                                                             19
                                                     August 1, 1998 Prospectus
<PAGE>
 
               Certain issuers of structured products such as hybrid instru-
            ments may be deemed to be investment companies as defined in the
            Investment Company Act of 1940 (the "1940 Act"). As a result, the
            Fund's investments in these products will be subject to limits ap-
            plicable to investments in investment companies and may be subject
            to restrictions contained in the 1940 Act.
   
CATASTROPHE The Fund may invest in "catastrophe bonds." Catastrophe bonds are
BONDS       fixed income securities, for which the return of principal and
            payment of interest is contingent on the non-occurrence of a spe-
            cific "trigger" catastrophic event, such as a hurricane or an
            earthquake. They may be issued by government agencies, insurance
            companies, reinsurers, special purpose corporations or other on-
            shore or off-shore entities. If a trigger event causes losses ex-
            ceeding a specific amount in the geographic region and time period
            specified in a bond, a Fund investing in the bond may lose a por-
            tion or all of its principal invested in the bond. If no trigger
            event occurs, the Fund will recover its principal plus interest.
            For some catastrophe bonds, the trigger event or losses may be
            based on companywide losses, index-portfolio losses, industry in-
            dices, or readings of scientific instruments rather than specified
            actual losses. Often the catastrophe bonds provide for extensions
            of maturity that are mandatory, or optional at the discretion of
            the issuer, in order to process and audit loss claims in those
            cases where a trigger event has, or possibly has, occurred. In ad-
            dition to the specified trigger events, catastrophe bonds may also
            expose the Fund to certain unanticipated risks including but not
            limited to issuer (credit) default, adverse regulatory or juris-
            dictional interpretations, and adverse tax consequences.     
               
               Catastrophe bonds are a relatively new type of financial in-
            strument. As such, there is no significant trading history of
            these securities, and there can be no assurance that a liquid mar-
            ket in these instruments will develop. See "Illiquid Securities"
            below. Lack of a liquid market may impose the risk of higher
            transaction costs and the possibility that a Fund may be forced to
            liquidate positions when it would not be advantageous to do so.
            Catastrophe bonds are typically rated, and the Fund will only in-
            vest in catastrophe bonds that meet the credit quality require-
            ments for the Fund.     
 
 
INVESTMENT  The Fund may invest in securities of other investment companies,
IN          such as closed-end management investment companies, or in pooled
INVESTMENT  accounts or other investment vehicles. As a shareholder of an in-
COMPANIES   vestment company, the Fund may indirectly bear service and other
            fees which are in addition to the fees the Fund pays its service
            providers.
 
 
PORTFOLIO   The length of time the Fund has held a particular security is not
TURNOVER    generally a consideration in investment decisions. The investment
            policies of the Fund may lead to frequent changes in the Fund's
            investments, particularly in periods of volatile market movements.
            A change in the securities held by the Fund is known as "portfolio
            turnover." High portfolio turnover (e.g., over 100%) involves cor-
            respondingly greater expenses to the Fund, including brokerage
            commissions or dealer mark-ups and other transaction costs on the
            sale of securities and reinvestments in other securities. Such
            sales may result in realization of taxable capital gains. See
            "Taxes." The portfolio turnover rate for the Fund is set forth un-
            der "Financial Highlights."
 
 
ILLIQUID       
SECURITIES  The Fund may invest up to 15% of its net assets in illiquid secu-
            rities. Certain illiquid securities may require pricing at fair
            value as determined in good faith under the supervision of the
            Board of Trustees. The Adviser may be subject to significant de-
            lays in disposing of illiquid securities, and transactions in il-
            liquid securities may entail registration expenses and other
            transaction costs that are higher than transactions in liquid se-
            curities. The term "illiquid securities" for this purpose means
            securities that cannot be disposed of within seven days in the or-
            dinary course of business at approximately the amount at which the
            Fund has valued the securities. Illiquid securities are considered
            to include, among other things, written over-the-counter options,
            securities or other liquid assets being used as cover for such op-
            tions, repurchase agreements with maturities in excess of seven
            days, certain loan participation interests, fixed time deposits
            which are not subject to prepayment or provide for withdrawal pen-
            alties upon prepayment (other than overnight deposits), securities
            that are subject to legal or contractual restrictions on resale
            (such as privately placed debt securities) and other securities
            whose disposition is restricted under the federal securities laws
            (other than securities issued pursuant     
 
20
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            to Rule 144A under the Securities Act of 1933 and certain commer-
            cial paper that Pacific Investment Management has determined to be
            liquid under procedures approved by the Board of Trustees).
               Illiquid securities may include privately placed securities,
            which are sold directly to a small number of investors, usually
            institutions. Unlike public offerings, such securities are not
            registered under the federal securities laws. Although certain of
            these securities may be readily sold, for example, under Rule
            144A, others may be illiquid, and their sale may involve substan-
            tial delays and additional costs.
 
 
SERVICE        
SYSTEMS--   Many of the services provided to the Fund depend on the smooth
YEAR 2000   functioning of computer systems. Many systems in use today cannot
PROBLEM     distinguish between the year 1900 and the year 2000. Should any of
            the service systems fail to process information properly, that
            could have an adverse impact on the Fund's operations and services
            provided to the shareholders. The Adviser, Distributor, Share-
            holder Servicing and Transfer Agent, Custodian, and certain other
            service providers to the Fund have reported that each is working
            toward mitigating the risks associated with the so-called
            "year 2000 problem." However, there can be no assurance that the
            problem will be corrected in all respects and that the Fund's op-
            erations and services provided to shareholders will not be ad-
            versely effected.     
 
            Performance Information
               
            From time to time the Trust may make available certain information
            about the performance of the Class A shares of the Fund. Informa-
            tion about the Fund's performance is based on the Fund's record to
            a recent date and is not intended to indicate future performance.
            Performance information is compiled separately for each class of
            the Fund's shares in accordance with the formulas described below.
                
               From time to time, the yield and total return for each class of
            shares of the Fund may be included in advertisements or reports to
            shareholders or prospective investors. Quotations of yield for the
            Fund or class will be based on the investment income per share (as
            defined by the Securities and Exchange Commission) during a par-
            ticular 30-day (or one-month) period (including dividends and in-
            terest), less expenses accrued during the period ("net investment
            income"), and will be computed by dividing net investment income
            by the maximum public offering price per share on the last day of
            the period.
               
               The total return of Class A shares of the Fund may be included
            in advertisements or other written material. When the Fund's total
            return is advertised with respect to its Class A shares, it will
            be calculated for the past year, the past five years, and since
            the establishment of the Fund, as more fully described in the
            Statement of Additional Information. For periods prior to the ini-
            tial offering date of Class A shares, total return presentations
            for the class will be based on the historical performance of an
            older class of the Fund restated to reflect current sales charges
            (if any) of the newer class. The older class to be used is set
            forth in the Statement of Additional Information. For these pur-
            poses, the performance of the older class will also be restated to
            reflect any different operating expenses (such as different admin-
            istrative fees and/or 12b-1/servicing fee charges) associated with
            the newer class. Total return for each class is measured by com-
            paring the value of an investment in the Fund at the beginning of
            the relevant period (in the case of Class A shares, giving effect
            to the maximum initial sales charge generally applicable to Class
            A shares) to the redemption value of the investment in the Fund at
            the end of the period (assuming immediate reinvestment of any div-
            idends or capital gains distributions at net asset value and giv-
            ing effect to the deduction of the maximum CDSC which would be
            payable). Total return may be advertised using alternative methods
            that reflect all elements of return, but that may be adjusted to
            reflect the cumulative impact of alternative fee and expense
            structures, such as the currently effective advisory and adminis-
            trative fees for the Fund.     
               Current distribution information may also be provided to the
            Trust's shareholders in shareholder reports or other shareholder
            communications, or in certain types of sales literature provided
            to prospective investors. Current distribution information for a
            particular class of the Fund will be based on distributions for a
            specified period (i.e., total dividends
                                                     August 1, 1998 Prospectus
                                                                              21
<PAGE>
 
            from net investment income), divided by the relevant class net as-
            set value per share on the last day of the period and annualized.
            The rate of current distributions does not reflect deductions for
            unrealized losses from transactions in derivative instruments such
            as options and futures, which may reduce total return. Current
            distribution rates differ from standardized yield rates in that
            they represent what a class of the Fund has declared and paid to
            shareholders as of the end of a specified period rather than the
            Fund's actual net investment income for that period.
               
               Performance information for the Trust may also be compared to
            various unmanaged indexes, such as the Standard & Poor's 500 Com-
            posite Stock Price Index, the Lehman Brothers Aggregate Bond In-
            dex, the Lehman Brothers Mortgage-Backed Securities Index, the
            Merrill Lynch 1 to 3 Year Treasury Index, the Lehman Intermediate
            and 20+ Year Treasury Blend Index, the Lehman BB Intermediate Cor-
            porate Index, indexes prepared by Lipper Analytical Services, the
            J.P. Morgan Global Index, the J.P. Morgan Emerging Markets Bond
            Index Plus, the Salomon Brothers World Government Bond Index-10
            Non U.S.-Dollar Hedged and the J.P. Morgan Government Bond Index
            Non U.S.-Dollar Hedged, and other entities or organizations which
            track the performance of investment companies or investment advis-
            ers. Unmanaged indexes (i.e., other than Lipper) generally do not
            reflect deductions for administrative and management costs and ex-
            penses. The Adviser may also report to shareholders or to the pub-
            lic in advertisements concerning the performance of the Adviser as
            adviser to clients other than the Trust, and on the comparative
            performance or standing of the Adviser in relation to other money
            managers. Such comparative information may be compiled or provided
            by independent ratings services or by news organizations. Any per-
            formance information, whether related to the Fund or to the Advis-
            er, should be considered in light of the Fund's investment objec-
            tives and policies, characteristics and quality of the portfolio,
            and the market conditions during the time period indicated, and
            should not be considered to be representative of what may be
            achieved in the future. For a description of the methods used to
            determine yield and total return for the Fund, see the Statement
            of Additional Information.     
               Investment results of the Fund will fluctuate over time, and
            any presentation of the Fund's total return or yield for any prior
            period should not be considered as a representation of what an in-
            vestor's total return or yield may be in any future period.
 
            How to Buy Shares
 
            Class A shares of the Fund of the Trust are continuously offered
            through the Trust's principal underwriter, PIMCO Funds Distribu-
            tors LLC (the "Distributor"). Class A shares of the Fund are
            available as an investment option in retirement or savings plans.
            The administrator of such a plan or a prospective participant's
            employee benefits office can provide detailed information on how
            to participate in such a plan and how to elect the Fund as an in-
            vestment option.
               A participant may be permitted to elect different investment
            options, alter the amounts contributed to the participant's plan,
            or change how contributions are allocated among investment options
            in accordance with the plan's specific provisions. A participant
            should consult the plan administrator or the participant's em-
            ployee benefits office for more details.
               Questions about the Fund should be directed to the Distributor
            at 800-426-0107. Questions about a participant's plan account
            should be directed to the plan administrator or the organization
            that provides recordkeeping services for the plan.
               All contributions received by the Distributor prior to the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            New York Stock Exchange (the "Exchange"), on a regular business
            day, are processed at that day's offering price, which will be net
            asset value next determined after acceptance of a contribution.
            However, contributions received by the Distributor after the of-
            fering price is determined that day will receive such offering
            price if the contributions were received by the plan administrator
            prior to such determination and were transmitted to and received
            by the Distributor prior to 10:00 a.m. Eastern time on the next
            business day. Contributions received on other than a regular busi-
            ness day will be executed on the next succeeding regular business
            day. The Distributor, in its sole discretion, may accept or reject
 
22
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            any order for purchase of Fund shares. The sale of shares will be
            suspended during any period in which the Exchange is closed for
            other than weekends or holidays, or if permitted by the rules of
            the Securities and Exchange Commission, when trading on the Ex-
            change is restricted or during an emergency which makes it imprac-
            ticable for the Fund to dispose of its securities or to determine
            fairly the value of its net assets, or during any other period as
            permitted by the Securities and Exchange Commission for the pro-
            tection of investors. No share certificates will be issued.
 
            SALES AT NET ASSET VALUE The Fund may sell its Class A shares at
            net asset value without a sales charge to, among others, (a)
            trustees or other fiduciaries purchasing shares for certain em-
            ployer sponsored plans that have at least 100 eligible partici-
            pants or at least $1 million in total plan assets, and (b) trust-
            ees or other fiduciaries purchasing shares for certain employer-
            sponsored plans, the trustee, administrator, fiduciary, broker,
            trust company or registered investment adviser for which has an
            agreement with the Distributor with respect to such purchases. The
            Distributor will pay a commission to dealers who sell Class A
            shares of the Fund at net asset value to certain employer-spon-
            sored plans according to the following schedule: .50% of the first
            $2,000,000 and .25% of amounts over $2,000,000. From time to time,
            the Distributor, its parent and/or its affiliates may make addi-
            tional payments to one or more participating brokers based upon
            factors such as the level of sales or the length of time clients'
            assets have remained in the Trust.
 
            Exchange Privilege
 
            A participant's plan may allow exchanges from one investment op-
            tion to another. A participant should check with the plan adminis-
            trator for details on the rules governing exchanges in the plan,
            including the frequency of permitted exchanges. Certain investment
            options may be subject to unique restrictions. Exchanges are ac-
            cepted by the Trust only as permitted by a participant's plan.
 
            How to Redeem
               
            Shares are redeemed at their net asset value next determined after
            a proper redemption request has been received. There is no charge
            by the Distributor with respect to a redemption. Requests for re-
            demption received during a day by the Distributor prior to the ac-
            tual close of that day's regular trading on the Exchange (normal-
            ly, 4:00 p.m. Eastern time) will be confirmed at the net asset
            value effective as of the closing of the Exchange on that day.
                
            Distributor and Distribution and Servicing Plan
 
 
            The Distributor, a wholly owned subsidiary of PIMCO Advisors L.P.,
            is the principal underwriter of the Fund's shares and in that con-
            nection makes servicing payments to participating brokers, certain
            banks and other financial intermediaries in connection with the
            sale of Class A shares. Pursuant to a Distribution Contract with
            the Trust, with respect to the Fund's Class A shares, the Distrib-
            utor bears various other promotional and sales related expenses,
            including the cost of printing and mailing prospectuses to persons
            other than current shareholders. The Distributor, located at 2187
            Atlantic Street, Stamford, Connecticut 06902 is a broker-dealer
            registered with the Securities and Exchange Commission.
 
            CLASS A SERVICING FEES As compensation for services rendered and
            expenses borne by the Distributor in connection with personal
            services rendered to Class A shareholders of the Fund and the
            maintenance of Class A shareholder accounts, the Trust pays the
            Distributor servicing fees up to the annual rate of .25% of the
            Fund's average daily net assets attributable to Class A shares.
 
                                                                             23
                                                     August 1, 1998 Prospectus
<PAGE>
 
               The Class A servicing fees paid to the Distributor are paid un-
            der a Distribution and Servicing Plan adopted pursuant to Rule
            12b-l under the 1940 Act, and is of the type known as a "compensa-
            tion" plan. This means that, although the Trustees of the Trust
            are expected to take into account the expenses of the Distributor
            and its predecessors in their periodic review of the Distribution
            and Servicing Plan, the fees are payable to compensate the Dis-
            tributor for services rendered even if the amount paid exceeds the
            Distributor's expenses.
               The servicing fee applicable to Class A shares of the Fund may
            be spent by the Distributor on personal services rendered to
            shareholders of the Fund and the maintenance of shareholder ac-
            counts, including compensation to, and expenses (including tele-
            phone and overhead expenses) of, financial consultants or other
            employees of participating or introducing brokers, certain banks
            and other financial intermediaries who aid in the processing of
            purchase or redemption requests or the processing of dividend pay-
            ments, who provide information periodically to shareholders show-
            ing their positions in the Fund's shares, who forward communica-
            tions from the Trust to shareholders, who render ongoing advice
            concerning the suitability of particular investment opportunities
            offered by the Trust in light of the shareholders' needs, who re-
            spond to inquiries from shareholders relating to such services, or
            who train personnel in the provision of such services. Distribu-
            tion and servicing fees may also be spent on interest relating to
            unreimbursed distribution or servicing expenses from prior years.
               Many of the Distributor's servicing efforts involve the Trust
            as a whole, so that fees paid by Class A shares of the Fund may
            indirectly support servicing efforts relating to shares of the
            same class of the other series of the Trust. In reporting its ex-
            penses to the Trustees, the Distributor itemizes expenses that re-
            late to the distribution and/or servicing of the Fund's shares,
            and allocates other expenses among all of the operational series
            based on their relative net assets. Expenses allocated to the Fund
            are further allocated among its classes of shares annually based
            on the relative sales of each class, except for any expenses that
            relate only to the sale or servicing of a single class. The Dis-
            tributor may make payments to brokers (and with respect to servic-
            ing fees only, to certain banks and other financial intermediar-
            ies) of up to .25% annually of the average daily net assets at-
            tributable to shares in the accounts of their customers or cli-
            ents. Payments may be made, in part, with respect to Class A
            shares of the Fund issued to former shareholders of PIMCO Advisors
            Funds in connection with the reorganizations of series of PIMCO
            Advisors Funds with series of the Trust, including the Fund, in a
            transaction which took place on January 17, 1997.
               The Distributor may from time to time pay additional cash bo-
            nuses or other incentives to selected participating brokers in
            connection with the servicing of Class A shares of the Fund. On
            some occasions, such bonuses or incentives may be conditioned upon
            the sale of a specified minimum dollar amount of the shares of the
            Fund and/or all of the series of the Trust together or a particu-
            lar class of shares, during a specific period of time. The Dis-
            tributor currently expects that such additional bonuses or incen-
            tives will not exceed .50% of the amount of any sale. Pacific In-
            vestment Management (in its capacity as administrator) may also
            pay participating brokers and other intermediaries for transfer
            agency and other services.
               If in any year the Distributor's expenses incurred in connec-
            tion with the servicing of shareholders and the maintenance of
            shareholder accounts exceed the servicing fees paid by the Trust,
            the Distributor would recover such excess only if the Distribution
            and Servicing Plan with respect to Class A shares continues to be
            in effect in some later year when the servicing fees exceed the
            Distributor's expenses. The Trust is not obligated to repay any
            unreimbursed expenses that may exist at such time, if any, as the
            relevant Distribution and Servicing Plan terminates.
 
            How Net Asset Value Is Determined
               
            The net asset value of Class A shares of the Fund will be deter-
            mined once on each day on which the Exchange is open as of the
            close of regular trading on the Exchange (normally 4:00 p.m.,
            Eastern time). Net asset value will not be determined on days on
            which the Exchange is closed.     
 
24
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               Portfolio securities and other assets for which market quota-
            tions are readily available are stated at market value. Market
            value is determined on the basis of last reported sales prices, or
            if no sales are reported, as is the case for most securities
            traded over-the-counter, at the mean between representative bid
            and asked quotations obtained from a quotation reporting system or
            from established market makers. Fixed income securities, including
            those to be purchased under firm commitment agreements (other than
            obligations having a maturity of 60 days or less), are normally
            valued on the basis of quotations obtained from brokers and deal-
            ers or pricing services, which take into account appropriate fac-
            tors such as institutional-sized trading in similar groups of se-
            curities, yield, quality, coupon rate, maturity, type of issue,
            trading characteristics, and other market data.
               Quotations of foreign securities in foreign currency are con-
            verted to U.S. dollar equivalents using foreign exchange quota-
            tions received from independent dealers. Short-term investments
            having a maturity of 60 days or less are valued at amortized cost,
            when the Board of Trustees determines that amortized cost is their
            fair value. Certain fixed income securities for which daily market
            quotations are not readily available may be valued, pursuant to
            guidelines established by the Board of Trustees, with reference to
            fixed income securities whose prices are more readily obtainable
            and whose durations are comparable to the securities being valued.
            Subject to the foregoing, other securities for which market quota-
            tions are not readily available are valued at fair value as deter-
            mined in good faith by the Board of Trustees.
               The Fund's liabilities are allocated among its classes. The to-
            tal of such liabilities allocated to a class plus that class's
            distribution and/or servicing fees and any other expenses spe-
            cially allocated to that class are then deducted from the class's
            proportionate interest in the Fund's assets, and the resulting
            amount for each class is divided by the number of shares of that
            class outstanding to produce the class's "net asset value" per
            share.
 
            Distributions
 
            The Fund pays out as dividends substantially all of its net in-
            vestment income (which comes from dividends and interest it re-
            ceives or is deemed to receive from its investments) and net real-
            ized short-term capital gains. For these purposes and for federal
            income tax purposes, a portion of the premiums from certain ex-
            pired call or put options written by the Fund, net gains from
            closing purchase and sale transactions with respect to such op-
            tions, and net gains from futures transactions are treated as
            short-term capital gains. The Fund distributes substantially all
            of its net realized capital gains, if any, after giving effect to
            any available capital loss carry-over.
               Shares begin earning dividends on the effective date of pur-
            chase, which is the date that funds are received by the Trust for
            the purchase of shares. Dividends are declared daily from net in-
            vestment income to shareholders of record at the close of the pre-
            vious business day, and distributed to shareholders monthly. Any
            net realized capital gains from the sale of portfolio securities
            will be distributed no less frequently than once yearly. Dividend
            and capital gain distributions of the Fund will be reinvested in
            additional shares of the Fund unless the shareholder elects to
            have them paid in cash.
               Dividends and capital gains distributions may be declared more
            or less frequently in the discretion of the Trustees. There are no
            sales charges on reinvested dividends.
 
            Taxes
 
            The Fund intends to qualify as a regulated investment company an-
            nually and to elect to be treated as a regulated investment com-
            pany under the Internal Revenue Code of 1986, as amended. As such,
            the Fund generally will not pay federal income tax on the income
            and gains it pays as dividends to its shareholders. In order to
            avoid a 4% federal excise tax, the Fund intends to distribute each
            year substantially all of its net income and gains.
               Distributions received by tax-exempt shareholders will not be
            subject to federal income tax to the extent permitted under appli-
            cable tax law. To the extent that a shareholder is not exempt from
            tax on Fund distributions, such share-
                                                     August 1, 1998 Prospectus
                                                                              25
<PAGE>
 
            holder will be subject to tax on dividends received from the Fund,
            regardless of whether received in cash or reinvested in additional
            shares. All shareholders must treat dividends, other than capital
            gain dividends or dividends that represent a return of capital to
            shareholders, as ordinary income.
               
               Dividends designated by the Fund as capital gain dividends
            derived from the Fund's net capital gain (that is, the excess of
            net long-term gain over net short-term loss) are taxable to
            shareholders as long-term capital gain except as provided by an
            applicable tax exemption. Any distributions that are not from the
            Fund's net investment income, short-term capital gain, or net
            capital gain may be characterized as a return of capital to
            shareholders or, in some cases, as capital gain. Certain dividends
            declared in October, November or December of a calendar year are
            taxable to shareholders (who are subject to tax on dividends) as
            though received on December 31 of that year if paid to
            shareholders during January of the following calendar year. The
            Fund will advise shareholders annually of the amount and nature of
            the dividends paid to them.     
               
               Interest accrued by the Fund from inflation-indexed bonds will
            be includable in the Fund's gross income in the period in which it
            accrues. Periodic adjustments for inflation in the principal value
            of these securities also may give rise to original issue discount,
            which, likewise, will be includable in the Fund's gross income on
            a current basis, regardless of whether the Fund receives any cash
            payments. See "Taxation--Original Issue Discount" in the Statement
            of Additional Information. Amounts includable in the Fund's gross
            income become subject to tax-related distribution requirements.
            Accordingly, the Fund may be required to make annual distributions
            to shareholders in excess of the cash received in a given period
            from these investments. As a result, the Fund may be required to
            liquidate certain investments at a time when it is not advanta-
            geous to do so. If the principal value of an inflation-indexed
            bond is adjusted downward in any period as a result of deflation,
            the reduction may be treated as a loss to the extent the reduction
            exceeds coupon payments received in that period; in that case, the
            amount distributable by the Fund may be reduced and amounts dis-
            tributed previously in the taxable year may be characterized in
            some circumstances as a return of capital.     
               Taxable shareholders should note that the timing of their in-
            vestment could have undesirable tax consequences. If shares are
            purchased on or just before the record date of a dividend, taxable
            shareholders will pay full price for the shares and may receive a
            portion of their investment back as a taxable distribution.
               
               If the Fund is used as an investment option in an employer-
            sponsored retirement savings plan, dividend and capital gains
            distributions from the Fund generally will not be subject to
            current taxation, but will accumulate on a tax-deferred basis. In
            general, employer-sponsored retirement and savings plans are
            governed by a complex set of tax rules. Participants in such a
            plan should consult the plan administrator, the plan's Summary
            Plan Description, or a professional tax adviser regarding the tax
            consequences of participation in the plan and of any plan
            contributions or withdrawals.     
               The preceding discussion relates only to federal income tax;
            the consequences under other tax laws may differ. For additional
            information relating to the tax aspects of investing in the Fund,
            see the Statement of Additional Information.
 
            Management of the Trust
 
            The business affairs of the Trust are managed under the direction
            of the Board of Trustees. The Trustees are Guilford C. Babcock, R.
            Wesley Burns, Vern O. Curtis, Brent R. Harris, Thomas P. Kemp, and
            William J. Popejoy. Additional information about the Trustees and
            the Trust's executive officers may be found in the Statement of
            Additional Information under the heading "Management--Trustees and
            Officers."
   
INVESTMENT  
ADVISER     Pacific Investment Management serves as investment adviser ("Ad-
            viser") to the Fund pursuant to an investment advisory contract.
            The Adviser is an investment management company founded in 1971,
            and had approximately $138 billion in assets under management as
            of June 30, 1998.     
 
26
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
               Pacific Investment Management is a subsidiary of PIMCO Advisors
            L.P. ("PIMCO Advisors"). The general partners of PIMCO Advisors
            are PIMCO Partners, G.P. and PIMCO Advisors Holdings L.P. PIMCO
            Partners, G.P. is a general partnership between PIMCO Holding LLC,
            a Delaware limited liability company and an indirect wholly-owned
            subsidiary of Pacific Life Insurance Company, and PIMCO Partners
            LLC, a California limited liability company controlled by the Man-
            aging Directors of Pacific Investment Management. PIMCO Partners,
            G.P. is the sole general partner of PIMCO Advisors Holdings L.P.
            Pacific Investment Management's address is 840 Newport Center
            Drive, Suite 300, Newport Beach, California 92660. Pacific Invest-
            ment Management is registered as an investment adviser with the
            Securities and Exchange Commission and as a commodity trading ad-
            visor with the CFTC.     
               
               The Adviser manages the investment and reinvestment of the as-
            sets of the Fund. The Adviser is responsible for placing orders
            for the purchase and sale of the Fund's investments directly with
            brokers or dealers selected by it in its discretion. See "Portfo-
            lio Transactions" in the Statement of Additional Information.     
               The portfolio manager responsible for management of the Fund is
            William H. Gross, Managing Director, Pacific Investment Manage-
            ment. A Fixed Income Portfolio Manager, Mr. Gross is one of the
            founders of Pacific Investment Management and has managed the Fund
            since its inception, May 11, 1987.
 
 
FUND
ADMINISTRATOR
            Pacific Investment Management also serves as administrator for the
            Fund's Class A shares pursuant to an administration agreement with
            the Trust. Pacific Investment Management provides administrative
            services for Class A shareholders of the Fund, which include cler-
            ical help and accounting, bookkeeping, internal audit services,
            and certain other services required by the Fund, preparation of
            reports to the Fund's shareholders and regulatory filings. Pacific
            Investment Management may also retain certain of its affiliates to
            provide certain of these services. In addition, Pacific Investment
            Management, at its own expense, arranges for the provision of le-
            gal, audit, custody, transfer agency (including sub-transfer
            agency and other administrative services) and other services for
            the Fund, and is responsible for the costs of registration of the
            Fund's shares and the printing of prospectuses and shareholder re-
            ports for current shareholders.
               The Fund (and not Pacific Investment Management) is responsible
            for the following expenses: (i) salaries and other compensation of
            any of the Trust's executive officers and employees who are not
            officers, directors, stockholders or employees of Pacific Invest-
            ment Management or its subsidiaries or affiliates; (ii) taxes and
            governmental fees; (iii) brokerage fees and commissions and other
            portfolio transaction expenses; (iv) the costs of borrowing money,
            including interest expenses; (v) fees and expenses of the Trustees
            who are not "interested persons" of Pacific Investment Management
            or the Trust, and any counsel retained exclusively for their bene-
            fit; (vi) extraordinary expenses, including costs of litigation
            and indemnification expenses; (vii) expenses, such as organiza-
            tional expenses, which are capitalized in accordance with gener-
            ally accepted accounting principles; and (viii) any expenses allo-
            cated or allocable to a specific class of shares, which include
            servicing fees payable with respect to Class A shares, and may in-
            clude certain other expenses as permitted by the Trust's Multi-
            Class Plan adopted pursuant to Rule 18f-3 under the 1940 Act, sub-
            ject to review and approval by the Trustees.
 
 
ADVISORY
AND
ADMINISTRATIVE
FEES
            The Fund features fixed advisory and administrative fee rates. For
            providing investment advisory and administrative services to the
            Fund as described above, Pacific Investment Management receives
            monthly fees from the Fund at an annual rate (i) based on the av-
            erage daily net assets of the Fund for advisory fees and, (ii) at-
            tributable in the aggregate to the Fund's Class A, Class B and
            Class C shares for administrative fees, as follows:
 
 
<TABLE>
<CAPTION>
           ADVISORY    ADMINISTRATIVE
           FEE RATE    FEE RATE
              -----------------------
           <S>         <C>
           .25%        .40%
</TABLE>
 
                                                     August 1, 1998 Prospectus
                                                                              27
<PAGE>
 
 
               Both the investment advisory contract and administration agree-
            ment with respect to Class A shares of the Fund may be terminated
            by the Trustees at any time on 60 days' written notice. The in-
            vestment advisory contract may be terminated by Pacific Investment
            Management on 60 days' written notice. Following the expiration of
            the one-year period commencing with the effectiveness of the ad-
            ministration agreement, it may be terminated by Pacific Investment
            Management on 60 days' written notice. Following its initial two-
            year term, the investment advisory contract will continue from
            year to year if approved by the Trustees. Following its initial
            one-year term, the administration agreement with respect to Class
            A shares of the Fund will continue from year-to-year if approved
            by the Trustees.
 
PORTFOLIO      
TRANSACTIONSPursuant to the advisory contract, the Adviser places orders for
            the purchase and sale of portfolio investments for the Fund's ac-
            counts with brokers or dealers selected by it in its discretion.
            In effecting purchases and sales of portfolio securities for the
            account of the Fund, the Adviser will seek the best price and exe-
            cution of the Fund's orders. In doing so, the Fund may pay higher
            commission rates than the lowest available when the Adviser be-
            lieves it is reasonable to do so in light of the value of the bro-
            kerage and research services provided by the broker effecting the
            transaction. The Adviser also may consider sales of shares of the
            Trust as a factor in the selection of broker-dealers to execute
            portfolio transactions for the Fund.     
               
               The Adviser manages the Fund without regard generally to re-
            strictions on portfolio turnover, except those imposed on its
            ability to engage in short-term trading by provisions of the fed-
            eral tax laws. The use of certain derivative instruments with rel-
            atively short maturities may tend to exaggerate the portfolio
            turnover rate for the Fund. Trading in fixed income securities
            does not generally involve the payment of brokerage commissions,
            but does involve indirect transaction costs. The use of futures
            contracts may involve the payment of commissions to futures com-
            mission merchants. The higher the rate of portfolio turnover of
            the Fund, the higher all these transaction costs borne by the Fund
            generally will be. The portfolio turnover rate for the Fund is set
            forth under "Financial Highlights."     
               
               Some securities considered for investments by the Fund may also
            be appropriate for other clients served by the Adviser. If a pur-
            chase or sale of securities consistent with the investment poli-
            cies of the Fund and one or more of these clients served by the
            Adviser is considered at or about the same time, transactions in
            such securities will be allocated among the Fund and clients in a
            manner deemed fair and reasonable by the Adviser.     
 
            Description of the Trust
 
CAPITALIZATION 
            The Trust was organized as a Massachusetts business trust on Feb-
            ruary 19, 1987. The Board of Trustees may establish additional
            portfolios in the future. The capitalization of the Trust consists
            solely of an unlimited number of shares of beneficial interest
            with a par value of $0.0001 each. When issued, shares of the Trust
            are fully paid, non-assessable and freely transferable.

               Under Massachusetts law, shareholders could, under certain cir-
            cumstances, be held personally liable for the obligations of the
            Trust. However, the Declaration of Trust disclaims liability of
            the shareholders, Trustees or officers of the Trust for acts or
            obligations of the Trust, which are binding only on the assets and
            property of the Trust, and requires that notice of the disclaimer
            be given in each contract or obligation entered into or executed
            by the Trust or the Trustees. The Declaration of Trust also pro-
            vides for indemnification out of Trust property for all loss and
            expense of any shareholder held personally liable for the obliga-
            tions of the Trust. The risk of a shareholder incurring financial
            loss on account of shareholder liability is limited to circum-
            stances in which such disclaimer is inoperative or the Trust it-
            self is unable to meet its obligations, and thus should be consid-
            ered remote.
 
 
MULTIPLE
CLASSES OF  In addition to Class A shares, the Fund offers Class B, Class C,
SHARES      Class D, Institutional Class and Administrative Class shares,
            through separate propectuses. Class A shares sold for personal in-
            vestment and the other classes of the Fund may have different
            sales charges and expense levels, which will affect performance
            accordingly. This Prospectus relates only to the Class A shares of
            the Fund. To obtain more information about the other classes,
            please call the Distributor at 800-927-4648 (for Institutional and
            Administrative Classes), 800-426-0107 (for Class B and C), or 888-
            87-PIMCO (for Class D).
 
28
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
VOTING      Shareholders have the right to vote on the election of Trustees
            and on any and all matters on which the law or the Declaration of
            Trust states they may be entitled to vote. The Trust is not re-
            quired to hold regular annual meetings of Trust shareholders and
            does not intend to do so. Shareholders of Class A shares or the
            Fund have separate voting rights with respect to matters that only
            affect that class or the Fund. See "Other Information--Voting
            Rights" in the Statement of Additional Information.
               The Declaration of Trust provides that the holders of not less
            than two-thirds of the outstanding shares of the Trust may remove
            a person serving as Trustee either by declaration in writing or at
            a meeting called for such purpose. The Trustees are required to
            call a meeting for the purpose of considering the removal of a
            person serving as Trustee if requested in writing to do so by the
            holders of not less than 10% of the outstanding shares of the
            Trust. Shares entitle their holders to one vote per share (with
            proportionate voting for fractional shares).
 
            Mailings to Shareholders
 
            To reduce the volume of mail shareholders receive, it is antici-
            pated that only one copy of most Trust reports, such as the
            Trust's annual report, will be mailed to a shareholder's household
            (same surname, same address). A shareholder may call 800-426-0107
            if additional shareholder reports are desired.
                                                     August 1, 1998 Prospectus
                                                                              29
<PAGE>
 
            Appendix A
            Description of Duration
               
            Duration is a measure of the expected life of a fixed income secu-
            rity that was developed as a more precise alternative to the con-
            cept of "term to maturity." Traditionally, a fixed income
            security's "term to maturity" has been used as a proxy for the
            sensitivity of the security's price to changes in interest rates
            (which is the "interest rate risk" or "volatility" of the securi-
            ty). However, "term to maturity" measures only the time until a
            fixed income security provides its final payment, taking no ac-
            count of the pattern of the security's payments prior to maturity.
            In contrast, duration incorporates a bond's yield, coupon interest
            payments, final maturity and call features into one measure. Dura-
            tion management is one of the fundamental tools used by the Advis-
            er.     
               Duration is a measure of the expected life of a fixed income
            security on a present value basis. Duration takes the length of
            the time intervals between the present time and the time that the
            interest and principal payments are scheduled or, in the case of a
            callable bond, expected to be received, and weights them by the
            present values of the cash to be received at each future point in
            time. For any fixed income security with interest payments occur-
            ring prior to the payment of principal, duration is always less
            than maturity. In general, all other things being equal, the lower
            the stated or coupon rate of interest of a fixed income security,
            the longer the duration of the security; conversely, the higher
            the stated or coupon rate of interest of a fixed income security,
            the shorter the duration of the security.
               Futures, options and options on futures have durations which,
            in general, are closely related to the duration of the securities
            which underlie them. Holding long futures or call option positions
            (backed by a segregated account of cash and cash equivalents) will
            lengthen the Fund's duration by approximately the same amount that
            holding an equivalent amount of the underlying securities would.
               Short futures or put option positions have durations roughly
            equal to the negative duration of the securities that underlie
            these positions, and have the effect of reducing portfolio dura-
            tion by approximately the same amount that selling an equivalent
            amount of the underlying securities would.
               
               There are some situations where even the standard duration cal-
            culation does not properly reflect the interest rate exposure of a
            security. For example, floating and variable rate securities often
            have final maturities of ten or more years; however, their inter-
            est rate exposure corresponds to the frequency of the coupon re-
            set. For inflation-indexed bonds, duration is calculated on the
            basis of modified real duration, which measures price changes of
            inflation-indexed bonds on the basis of changes in real, rather
            than nominal, interest rates. Another example where the interest
            rate exposure is not properly captured by duration is the case of
            mortgage pass-through securities. The stated final maturity of
            such securities is generally 30 years, but current prepayment
            rates are more critical in determining the securities' interest
            rate exposure. Finally, the duration of a fixed income security
            may vary over time in response to changes in interest rates and
            other market factors. In these and other similar situations, the
            Adviser will use more sophisticated analytical techniques that in-
            corporate the anticipated economic life of a security into the de-
            termination of its interest rate exposure.     
 
30
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Appendix B
            Description of Securities Ratings
               
            The Fund's investments may range in quality from securities rated
            in the lowest category in which the Fund is permitted to invest to
            securities rated in the highest category (as rated by Moody's or
            S&P or, if unrated, determined by the Adviser to be of comparable
            quality). The percentage of the Fund's assets invested in securi-
            ties in a particular rating category will vary. Following is a de-
            scription of Moody's and S&P's ratings applicable to fixed income
            securities.     
 
 
MOODY'S     CORPORATE AND MUNICIPAL BOND RATINGS
INVESTORS      Aaa: Bonds which are rated Aaa are judged to be of the best
SERVICE,    quality. They carry the smallest degree of investment risk and are
INC.        generally referred to as "gilt edge." Interest payments are pro-
            tected by a large or by an exceptionally stable margin and princi-
            pal is secure. While the various protective elements are likely to
            change, such changes as can be visualized are most unlikely to im-
            pair the fundamentally strong position of such issues.
               Aa: Bonds which are rated Aa are judged to be of high quality
            by all standards. Together with the Aaa group they comprise what
            are generally known as high-grade bonds. They are rated lower than
            the best bonds because margins of protection may not be as large
            as in Aaa securities or fluctuation of protective elements may be
            of greater amplitude or there may be other elements present that
            make the long-term risks appear somewhat larger than with Aaa se-
            curities.
               A: Bonds which are rated A possess many favorable investment
            attributes and are to be considered as upper-medium-grade obliga-
            tions. Factors giving security to principal and interest are con-
            sidered adequate but elements may be present that suggest a sus-
            ceptibility to impairment sometime in the future.
               Baa: Bonds which are rated Baa are considered as medium-grade
            obligations (i.e., they are neither highly protected nor poorly
            secured). Interest payments and principal security appear adequate
            for the present but certain protective elements may be lacking or
            may be characteristically unreliable over any great length of
            time. Such bonds lack outstanding investment characteristics and
            in fact have speculative characteristics as well.
               Ba: Bonds which are rated Ba are judged to have speculative el-
            ements; their future cannot be considered as well-assured. Often
            the protection of interest and principal payments may be very mod-
            erate and thereby not well safeguarded during both good and bad
            times over the future. Uncertainty of position characterizes bonds
            in this class.
               B: Bonds which are rated B generally lack characteristics of a
            desirable investment. Assurance of interest and principal payments
            or of maintenance of other terms of the contract over any long pe-
            riod of time may be small.
               Caa: Bonds which are rated Caa are of poor standing. Such is-
            sues may be in default or there may be present elements of danger
            with respect to principal or interest.
               Ca: Bonds which are rated Ca represent obligations which are
            speculative in a high degree. Such issues are often in default or
            have other marked shortcomings.
               C: Bonds which are rated C are the lowest rated class of bonds
            and issues so rated can be regarded as having extremely poor pros-
            pects of ever attaining any real investment standing.
               Moody's applies numerical modifiers, 1, 2, and 3 in each ge-
            neric rating classified from Aa through B in its corporate bond
            rating system. The modifier 1 indicates that the security ranks in
            the higher end of its generic rating category; the modifier 2 in-
            dicates a mid-range ranking; and the modifier 3 indicates that the
            issue ranks in the lower end of its generic rating category.
 
            CORPORATE SHORT-TERM DEBT RATINGS
            Moody's short-term debt ratings are opinions of the ability of is-
            suers to repay punctually senior debt obligations which have an
            original maturity not exceeding one year. Obligations relying upon
            support mechanisms such as letters of credit and bonds of indem-
            nity are excluded unless explicitly rated.
 
                                                                             31
                                                     August 1, 1998 Prospectus
<PAGE>
 
               Moody's employs the following three designations, all judged to
            be investment grade, to indicate the relative repayment ability of
            rated issuers:
               PRIME-1: Issuers rated Prime-1 (or supporting institutions)
            have a superior ability for repayment of senior short-term debt
            obligations. Prime-1 repayment ability will often be evidenced by
            many of the following characteristics: leading market positions in
            well-established industries; high rates of return on funds em-
            ployed; conservative capitalization structure with moderate reli-
            ance on debt and ample asset protection; broad margins in earnings
            coverage of fixed financial charges and high internal cash genera-
            tion; and well-established access to a range of financial markets
            and assured sources of alternate liquidity.
               PRIME-2: Issuers rated Prime-2 (or supporting institutions)
            have a strong ability for repayment of senior short-term debt ob-
            ligations. This will normally be evidenced by many of the charac-
            teristics cited above but to a lesser degree. Earnings trends and
            coverage ratios, while sound, may be more subject to variation.
            Capitalization characteristics, while still appropriate, may be
            more affected by external conditions. Ample alternate liquidity is
            maintained.
               PRIME-3: Issuers rated Prime-3 (or supporting institutions)
            have an acceptable ability for repayment of senior short-term ob-
            ligations. The effect of industry characteristics and market com-
            positions may be more pronounced. Variability in earnings and
            profitability may result in changes in the level of debt protec-
            tion measurements and may require relatively high financial lever-
            age. Adequate alternate liquidity is maintained.
               NOT PRIME: Issuers rated Not Prime do not fall within any of
            the Prime rating categories.
 
 
STANDARD &  CORPORATE AND MUNICIPAL BOND RATINGS
POOR'S
RATINGS
SERVICES
 
            Investment Grade
               AAA: Debt rated AAA has the highest rating assigned by S&P. Ca-
            pacity to pay interest and repay principal is extremely strong.
               AA: Debt rated AA has a very strong capacity to pay interest
            and repay principal and differs from the highest rated issues only
            in small degree.
               A: Debt rated A has a strong capacity to pay interest and repay
            principal although it is somewhat more susceptible to the adverse
            effects of changes in circumstances and economic conditions than
            debt in higher rated categories.
               BBB: Debt rated BBB is regarded as having an adequate capacity
            to pay interest and repay principal. Whereas it normally exhibits
            adequate protection parameters, adverse economic conditions, or
            changing circumstances are more likely to lead to a weakened ca-
            pacity to pay interest and repay principal for debt in this cate-
            gory than in higher-rated categories.
 
            Speculative Grade
            Debt rated BB, B, CCC, CC, and C is regarded as having predomi-
            nantly speculative characteristics with respect to capacity to pay
            interest and repay principal. BB indicates the least degree of
            speculation and C the highest. While such debt will likely have
            some quality and protective characteristics, these are outweighed
            by large uncertainties or major exposures to adverse conditions.
               BB: Debt rated BB has less near-term vulnerability to default
            than other speculative issues. However, it faces major ongoing un-
            certainties or exposure to adverse business, financial, or eco-
            nomic conditions which could lead to inadequate capacity to meet
            timely interest and principal payments. The BB rating category is
            also used for debt subordinated to senior debt that is assigned an
            actual or implied BBB- rating.
               B: Debt rated B has a greater vulnerability to default but cur-
            rently has the capacity to meet interest payments and principal
            repayments. Adverse business, financial, or economic conditions
            will likely impair capacity or willingness to pay interest and re-
            pay principal. The B rating category is also used for debt subor-
            dinated to senior debt that is assigned an actual or implied BB or
            BB- rating.
 
32
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               CCC: Debt rated CCC has a currently identifiable vulnerability
            to default and is dependent upon favorable business, financial,
            and economic conditions to meet timely payment of interest and re-
            payment of principal. In the event of adverse business, financial
            or economic conditions, it is not likely to have the capacity to
            pay interest and repay principal. The CCC rating category is also
            used for debt subordinated to senior debt that is assigned an ac-
            tual or implied B or B- rating.
               CC: The rating CC is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC rating.
               C: The rating C is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC- debt rat-
            ing. The C rating may be used to cover a situation where a bank-
            ruptcy petition has been filed, but debt service payments are con-
            tinued.
               CI: The rating CI is reserved for income bonds on which no in-
            terest is being paid.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period. The D rating will also be used upon the filing of a
            bankruptcy petition if debt service payments are jeopardized.
               Plus (+) or Minus (-): The ratings from AA to CCC may be modi-
            fied by the addition of a plus or minus sign to show relative
            standing within the major rating categories.
               Provisional ratings: The letter "p" indicates that the rating
            is provisional. A provisional rating assumes the successful com-
            pletion of the project being financed by the debt being rated and
            indicates that payment of debt service requirements is largely or
            entirely dependent upon the successful and timely completion of
            the project. This rating, however, while addressing credit quality
            subsequent to completion of the project, makes no comment on the
            likelihood of, or the risk of default upon failure of, such com-
            pletion. The investor should exercise his own judgment with re-
            spect to such likelihood and risk.
               r: The "r" is attached to highlight derivative, hybrid, and
            certain other obligations that S&P believes may experience high
            volatility or high variability in expected returns due to non-
            credit risks. Examples of such obligations are: securities whose
            principal or interest return is indexed to equities, commodities,
            or currencies; certain swaps and options; and interest only and
            principal only mortgage securities.
               The absence of an "r" symbol should not be taken as an indica-
            tion that an obligation will exhibit no volatility or variability
            in total return.
               N.R.: Not rated.
               Debt obligations of issuers outside the United States and its
            territories are rated on the same basis as domestic corporate and
            municipal issues. The ratings measure the creditworthiness of the
            obligor but do not take into account currency exchange and related
            uncertainties.
 
            COMMERCIAL PAPER RATING DEFINITIONS
            An S&P commercial paper rating is a current assessment of the
            likelihood of timely payment of debt having an original maturity
            of no more than 365 days. Ratings are graded into several catego-
            ries, ranging from A for the highest quality obligations to D for
            the lowest. These categories are as follows:
               A-1: This highest category indicates that the degree of safety
            regarding timely payment is strong. Those issues determined to
            possess extremely strong safety characteristics are denoted with a
            plus sign (+) designation.
               A-2: Capacity for timely payment on issues with this designa-
            tion is satisfactory. However, the relative degree of safety is
            not as high as for issues designated A-1.
               A-3: Issues carrying this designation have adequate capacity
            for timely payment. They are, however, more vulnerable to the ad-
            verse effects of changes in circumstances than obligations carry-
            ing the higher designations.
               B: Issues rated B are regarded as having only speculative ca-
            pacity for timely payment.
               C: This rating is assigned to short-term debt obligations with
            a doubtful capacity for payment.
 
                                                                             33
                                                     August 1, 1998 Prospectus
<PAGE>
 
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due, even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period.
               A commercial paper rating is not a recommendation to purchase,
            sell or hold a security inasmuch as it does not comment as to mar-
            ket price or suitability for a particular investor. The ratings
            are based on current information furnished to S&P by the issuer or
            obtained from other sources it considers reliable. S&P does not
            perform an audit in connection with any rating and may, on occa-
            sion, rely on unaudited financial information. The ratings may be
            changed, suspended, or withdrawn as a result of changes in or un-
            availability of such information.
 
34
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
<TABLE> 
<CAPTION> 
<C>                 <S> 
                    ------------------------------------------------------------------------------------------
PIMCO               INVESTMENT ADVISOR AND ADMINISTRATOR
Total Return Fund   
                    Pacific Investment Management Company, 840 Newport Center Drive, Suite 300,
                    Newport Beach, CA 92660
                    ------------------------------------------------------------------------------------------
                    DISTRIBUTOR

                    PIMCO Funds Distributors LLC, 2187 Atlantic Street, Stamford CT 06902
                    ------------------------------------------------------------------------------------------
                    CUSTODIAN

                    Investors Fiduciary Trust Company, 801 Pennsylvania, Kansas City, MO 64105
                    ------------------------------------------------------------------------------------------
                    SHAREHOLDER SERVICING AGENT AND TRANSFER AGENT

                    Shareholder Services, Inc., P.O. Box 5866, Denver, CO 80217
                    ------------------------------------------------------------------------------------------
                    INDEPENDENT ACCOUNTANTS

                    PricewaterhouseCoopers LLP, 1055 Broadway, Kansas City, MO 64105
                    ------------------------------------------------------------------------------------------
                    LEGAL COUNSEL

                    Dechert Price & Rhoads, 1775 Eye Street N.W., Washington, D.C. 20006
                    ------------------------------------------------------------------------------------------
                    For further information about the PIMCO Funds, call 1-800-426-0107 or visit our Web site  
                    at www.pimcofunds.com.
</TABLE> 
<PAGE>
 
PIMCO Funds

Prospectus

        
AUGUST 1, 1998       


    
                 ---------------------------------------------------------------
PIMCO Funds:     STOCK FUNDS
Pacific
Investment       StocksPLUS Fund
Management       StocksPLUS Short Strategy Fund*
Series
Class A, B       ---------------------------------------------------------------
and C Shares     STOCK AND BOND FUNDS
     
                 Strategic Balanced Fund*

                 ---------------------------------------------------------------
                 LONG-TERM BOND FUNDS

                 Long-Term U.S. Government Fund

                 ---------------------------------------------------------------
                     
                 INTERMEDIATE-TERM BOND FUNDS

                 Emerging Markets Bond Fund         Total Return Fund II*      
                 Emerging Markets Bond Fund II*     Total Return Fund III*     
                 Foreign Bond Fund                  Total Return Mortgage Fund*
                 Global Bond Fund*                  Commercial Mortgage        
                 Global Bond Fund II                 Securities Fund*          
                 International Bond Fund*           Moderate Duration Fund*    
                 High Yield Fund                    Real Return Bond Fund       
                 Total Return Fund                       

                 ---------------------------------------------------------------
                     
                 SHORTER-TERM BOND FUNDS

                 Low Duration Fund            Low Duration Mortgage Fund*
                 Low Duration Fund II*        Short-Term Fund  
                 Low Duration Fund III*       Money Market Fund      

                     
                 ---------------------------------------------------------------

                 MUNICIPAL BOND FUNDS         

                 Municipal Bond Fund      


                 *  These Funds are not available for investment as of the date 
                 of this Prospectus.

         
                 P I M C O
<PAGE>
 
                
            PIMCO Funds: Pacific Investment Management Series
            Prospectus
            August 1, 1998      
 
                
            PIMCO Funds (the "Trust") is an open-end series management invest-
            ment company offering twenty-five separate investment portfolios
            (each a "Fund"), each with different investment objectives and
            strategies. Each of the Funds is described herein. The Trust is
            designed to provide access to the professional investment manage-
            ment services offered by Pacific Investment Management Company
            ("Pacific Investment Management"), which serves as investment ad-
            viser (the "Advisor") to the Funds. The address of PIMCO Funds is
            840 Newport Center Drive, Suite 300, Newport Beach, CA 92660.      
                   
            Each Fund offers three classes of shares in this Prospectus: Class A
            shares (generally sold subject to an initial sales charge), Class B
            shares (sold subject to a contingent deferred sales charge) and
            Class C shares (sold subject to an asset based sales charge).
            Through a separate prospectus, certain Funds offer up to three
            additional classes of shares, Class D, Institutional Class and
            Administrative Class shares. See "Description of the Trust--Multiple
            Classes of Shares."     
            
            This Prospectus concisely describes the information investors
            should know before investing in Class A, Class B or Class C shares
            of the Funds. Please read this Prospectus carefully and keep it
            for further reference. Information about the investment objective
            of each Fund, along with a detailed description of the types of
            securities in which each Fund may invest and of investment poli-
            cies and restrictions applicable to each Fund, is set forth in
            this Prospectus. There can be no assurance that the investment ob-
            jective of any Fund will be achieved. Because the market value of
            each Fund's investments will change, the investment returns and
            net asset value per share of each Fund will vary.     
 
                    
            A Statement of Additional Information dated August 1, 1998, as
            amended or supplemented from time to time, is available free of
            charge by writing to PIMCO Funds Distributors LLC (the "Dis-
            tributor"), 2187 Atlantic Street, Stamford, Connecticut 06902, or
            by telephoning 800-426-0107. The Statement of Additional Informa-
            tion, which contains more detailed information about the Trust,
            has been filed with the Securities and Exchange Commission and is
            incorporated by reference in this Prospectus.      
 
            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SE-
            CURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMIS-
            SION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
            SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
            PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OF-
            FENSE.
 
            SHARES OF THE FUNDS ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARAN-
            TEED OR ENDORSED BY, ANY FINANCIAL INSTITUTION, AND THE SHARES ARE
            NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORA-
            TION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY.
 
            INVESTMENT IN THE MONEY MARKET FUND (OR IN ANY OTHER FUND) IS NEI-
            THER INSURED NOR GUARANTEED BY THE U.S. GOVERNMENT. THERE CAN BE
            NO ASSURANCE THAT THE MONEY MARKET FUND WILL BE ABLE TO MAINTAIN A
            STABLE NET ASSET VALUE OF $1.00 PER SHARE.
                
            EACH OF THE FUNDS, EXCEPT THE MONEY MARKET FUND, MAY INVEST ALL OF
            ITS ASSETS IN DERIVATIVE INSTRUMENTS, SOME OF WHICH MAY BE PARTIC-
            ULARLY SENSITIVE TO CHANGES IN PREVAILING INTEREST RATES. UNEX-
            PECTED CHANGES IN INTEREST RATES MAY ADVERSELY AFFECT THE VALUE OF
            A FUND'S INVESTMENTS IN PARTICULAR DERIVATIVE INSTRUMENTS.     
 
            THE HIGH YIELD FUND MAY INVEST ALL OF ITS ASSETS, AND THE COMMER-
            CIAL MORTGAGE SECURITIES FUND MAY INVEST UP TO 35% OF ITS ASSETS,
            IN JUNK BONDS, WHICH ARE SUBJECT TO HIGH RISK, AND SPECULATIVE
            WITH REGARD TO PAYMENT OF INTEREST AND RETURN OF PRINCIPAL. IN-
            VESTORS SHOULD CAREFULLY CONSIDER THESE RISKS BEFORE INVESTING IN
            THESE FUNDS. SEE "CHARACTERISTICS AND RISKS OF SECURITIES AND IN-
            VESTMENT TECHNIQUES--HIGH YIELD SECURITIES ("JUNK BONDS")."
 
              TABLE OF CONTENTS
 
<TABLE>     
<S>                                                                          <C>
Overview...................................................................   3
Schedule of Fees...........................................................   4
Financial Highlights.......................................................   8
Investment Objectives and Policies.........................................  13
Investment Risks and Considerations........................................  23
Characteristics and Risks of Securities and Investment Techniques..........  24
Performance Information....................................................  40
How to Buy Shares..........................................................  41
Alternative Purchase Arrangements..........................................  44
Exchange Privilege.........................................................  53
How to Redeem..............................................................  54
Distributor and Distribution and Servicing Plans...........................  58
How Net Asset Value Is Determined..........................................  62
Distributions..............................................................  63
Taxes......................................................................  63
Management of the Trust....................................................  64
Description of the Trust...................................................  67
Mailings to Shareholders...................................................  68
Appendix A -- Description of Duration......................................  69
Appendix B -- Description of Securities Ratings............................  70
</TABLE>      
         
<PAGE>
 
            Overview
               
            Pacific Investment Management, a subsidiary partnership of PIMCO
            Advisors L.P., is the investment adviser of all of the Funds. Pa-
            cific Investment Management is one of the premier fixed income in-
            vestment management firms in the U.S. As of June 30, 1998, Pacific
            Investment Management had approximately $138 billion in assets under
            manage-ment. Pacific Investment Management invests in all sectors of
            the fixed income market, using its total return philosophy--seeking
            capital appreciation as well as yield.     
 
<TABLE>   
<CAPTION>
                             PIMCO                     PRIMARY
                             FUND NAME                 OBJECTIVE                              DURATION          CREDIT QUALITY/1/
              ---------------------------------------------------------------------------------------------------------
           <S>               <C>                       <C>                                    <C>               <C>
           STOCK FUNDS       StocksPLUS/2/             Total return which exceeds that of the 0-1 year          B to Aaa; max
                                                       S&P 500                                                  10% below Baa
                           ------------------------------------------------------------------------------------
                             StocksPLUS Short          Total return through implementation    0-1 year          B to Aaa; max
                             Strategy                  of short positions on the S&P 500                        10% below Baa
              ---------------------------------------------------------------------------------------------------------
           STOCK AND BOND
            FUNDS            Strategic Balanced        Maximum total return, consistent       0-6 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
              ---------------------------------------------------------------------------------------------------------
           LONG-TERM BOND
            FUNDS            Long-Term U.S. Government Maximum total return, consistent       greater than      A to Aaa
                                                       with preservation of capital           or equal to
                                                                                              8 years  
                           ------------------------------------------------------------------------------------
                             Municipal Bond            High current income exempt from        3-10 years        B to Aaa; max
                                                       federal income tax, consistent with                      10% below Baa
                                                       preservation of capital
              ---------------------------------------------------------------------------------------------------------
           INTERMEDIATE-     Emerging Markets Bond     Maximum total return, consistent       0-8 years         B to Aaa
            TERM BOND FUNDS                            with preservation of capital and
                                                       prudent investment management
                           ------------------------------------------------------------------------------------
                             Emerging Markets Bond II  Maximum total return, consistent       0-8 years         B to Aaa
                                                       with preservation of capital and
                                                       prudent investment management
                           ------------------------------------------------------------------------------------
                             Foreign Bond              Maximum total return, consistent       3-6 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
                                                       (non-U.S.)
                           ------------------------------------------------------------------------------------
                             Global Bond               Maximum total return, consistent       3-6 years         B to Aaa; max
                                                       with preservation of capital (U.S.                       10% below Baa
                                                       and non-U.S.)
                           ------------------------------------------------------------------------------------
                             Global Bond II            Maximum total return, consistent       3-6 years         B to Aaa; max
                                                       with preservation of capital (U.S.                       10% below Baa
                                                       and non-U.S.)
                           ------------------------------------------------------------------------------------
                             International Bond        Maximum total return, consistent       0-8 years         Baa to Aaa
                                                       with preservation of capital (U.S.
                                                       and non-U.S.)
                           ------------------------------------------------------------------------------------
                             High Yield                Maximum total return, consistent       3-6 years         B to Aaa; min
                                                       with preservation of capital                             65% below Baa
                           ------------------------------------------------------------------------------------
                             Total Return              Maximum total return, consistent       3-6 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
                           ------------------------------------------------------------------------------------
                             Total Return II           Maximum total return, consistent       3-6 years         Baa to Aaa
                                                       with preservation of capital
                           ------------------------------------------------------------------------------------
                             Total Return III          Maximum total return, consistent       3-6 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
                           ------------------------------------------------------------------------------------
                             Total Return Mortgage     Maximum total return, consistent       2-6 years         B to Aaa; max
                                                       with preservation of capital and                         10% below Aaa
                                                       prudent investment management 
                           ------------------------------------------------------------------------------------
                             Commercial Mortgage       Maximum total return, consistent       3-8 years         B to Aaa; max
                             Securities                with preservation of capital                             35% below Baa
                           ------------------------------------------------------------------------------------
                             Moderate Duration         Maximum total return, consistent       2-5 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
                           ------------------------------------------------------------------------------------
                             Real Return Bond          Maximum real return, consistent        Not applicable,   B to Aaa; max
                                                       with preservation of real capital      but see Fund      10% below Baa
                                                                                              description
              ---------------------------------------------------------------------------------------------------------
           SHORTER-TERM
            BOND FUNDS       Low Duration              Maximum total return, consistent       1-3 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
                           ------------------------------------------------------------------------------------
                             Low Duration II           Maximum total return, consistent       1-3 years         A to Aaa
                                                       with preservation of capital
                           ------------------------------------------------------------------------------------
                             Low Duration III          Maximum total return, consistent       1-3 years         B to Aaa; max
                                                       with preservation of capital                             10% below Baa
                           ------------------------------------------------------------------------------------
                             Low Duration Mortgage     Maximum total return, consistent       1-3 years         B to Aaa;
                                                       with preservation of capital and                         10% below Aaa
                                                       prudent investment management
                           ------------------------------------------------------------------------------------
                             Short-Term                Maximum current income, consistent     0-1 year          B to Aaa; max
                                                       with preservation of capital and                         10% below Baa
                                                       daily liquidity
                           ------------------------------------------------------------------------------------
                             Money Market              Maximum current income, consistent     less than or      Min 95% Aaa or
                                                       with preservation of capital and       equal to          Prime 1; less
                                                       daily liquidity                        90 days dollar-   than or equal
                                                                                              weighted average  to 5% Aa  
                                                                                              maturity          or Prime 2 
</TABLE>     

PIMCO FUND
PROFILES
                
            1. As rated by Moody's Investors Service, Inc., or if unrated, de-
            termined to be of comparable quality. For specific information
            concerning the credit quality of the securities in each Fund's
            portfolio, see "Investment Objectives and Policies."     
               
            2. The Fund may invest all of its assets in stock index futures
            backed by short term bonds.    

                                                        
<PAGE>
 
            Schedule of Fees
 
SHAREHOLDER
TRANSACTION
EXPENSES
 
 
<TABLE>    
<CAPTION>
                                                       CLASS A   CLASS B CLASS C
                                                       SHARES    SHARES  SHARES
              ------------------------------------------------------------------
           <S>                                         <C>       <C>     <C>
           MAXIMUM INITIAL SALES CHARGE IMPOSED ON
            PURCHASES
            (as a percentage of offering price at
            time of purchase)
             ALL FUNDS EXCEPT FOR MONEY MARKET,
              SHORT-TERM, REAL RETURN BOND, LOW DU-
              RATION, LOW DURATION MORTGAGE AND
              STOCKSPLUS FUNDS                             4.50%    None    None
             REAL RETURN BOND, LOW DURATION, LOW DU-
              RATION MORTGAGE AND STOCKSPLUS FUNDS         3.00%    None    None
             SHORT-TERM FUND                               2.00%    None    None
             MONEY MARKET FUND                         None(/1/)    None    None
              ------------------------------------------------------------------
           MAXIMUM SALES CHARGE IMPOSED ON REIN-
            VESTED DIVIDENDS
            (as a percentage of net asset value at
            time of purchase)                               None    None    None
              ------------------------------------------------------------------
           MAXIMUM CONTINGENT DEFERRED SALES CHARGE
            ("CDSC")
            (as a percentage of original purchase
            price)                                       1%(/2/) 5%(/3/) 1%(/4/)
              ------------------------------------------------------------------
           REDEMPTION FEE
             STOCKSPLUS SHORT STRATEGY FUND              1%(/5/) 1%(/5/) 1%(/5/)
             ALL OTHER FUNDS                                None    None    None
              ------------------------------------------------------------------
           EXCHANGE FEE                                     None    None    None
</TABLE>     
 
            1. Regular sales charges apply when Class A shares of the Money
            Market Fund (on which no sales charge was paid at time of pur-
            chase) are exchanged for shares of any other Fund.
            2. Imposed only in certain circumstances where Class A shares are
            purchased without a front-end sales charge at the time of pur-
            chase. See "Alternative Purchase Arrangements" in this Prospectus.
            3. The maximum CDSC is imposed on shares redeemed in the first
            year. For shares held longer than one year, the CDSC declines ac-
            cording to the schedule set forth under "Alternative Purchase Ar-
            rangements--Deferred Sales Charge Alternative--Class B Shares" in
            this Prospectus.
            4. The CDSC on Class C shares is imposed only on shares redeemed
            in the first year.
            5. On shares held less than 3 months.

       
<PAGE>
 
               
            The purpose of the following tables is to assist investors in un-
            derstanding the various costs and expenses of the Trust that are
            borne directly or indirectly by Class A, Class B and Class C
            shareholders of the Funds. The Examples for Class A shares assume
            payment of the current maximum applicable sales load. Due to the 
            12b-1 distribution fee imposed on Class B and Class C shares, a 
            Class B or Class C shareholder of the Trust may, depending on the
            length of time the shares are held, pay more than the economic
            equivalent of the maximum front-end sales charges permitted by
            relevant rules of the National Association of Securities Dealers,
            Inc.    
 
            NOTE: THE FIGURES SHOWN IN THE EXAMPLES ARE ENTIRELY HYPOTHETICAL.
            THEY ARE NOT REPRESENTATIONS OF PAST OR FUTURE PERFORMANCE OR EX-
            PENSES; ACTUAL PERFORMANCE AND/OR EXPENSES MAY BE MORE OR LESS
            THAN SHOWN.
 
 
<TABLE>        
<CAPTION>
                                                                               EXAMPLE: You
                                                                               would pay the     EXAMPLE: You
                                                                               following         would pay the
                                                                               expenses on a     following
                                                                               $1,000 investment expenses on a
                                                                               assuming (1) 5%   $1,000 investment
                                                                               annual return and assuming (1) 5%
                                                                               (2) redemption at annual return and
                                     ANNUAL FUND OPERATING EXPENSES            the end of each   (2) no
                                     (As a percentage of average net assets):  time period:      redemption:
                                                                    TOTAL
                                               ADMINI-              FUND
CLASS A                              ADVISORY  STRATIVE  12B-1      OPERATING  YEAR              YEAR
SHARES     FUND                      FEE       FEE       FEES(/1/)  EXPENSES   1    3   5   10   1    3   5   10
- -------    -------------------------------------------------------------------------------------------------------
           <S>                       <C>       <C>       <C>        <C>        <C>  <C> <C> <C>  <C>  <C> <C> <C>
           STOCKSPLUS                .40%      .40%      .25%       1.05%      $40  $62 $86 $154 $40  $62 $86 $154
           -------------------------------------------------------------------------------------------------------
           STOCKSPLUS SHORT STRAT-
            EGY                      .40       .40       .25        1.05        55   77 100  167  55   77 100  167
           -------------------------------------------------------------------------------------------------------
           STRATEGIC BALANCED        .40       .40       .25        1.05        55   77 100  167  55   77 100  167
           -------------------------------------------------------------------------------------------------------
           LONG-TERM U.S.
            GOVERNMENT               .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           MUNICIPAL BOND            .25       .35       .25         .85        38   56 N/A  N/A  38   56 N/A  N/A
           -------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND     .45       .55       .25        1.25        57   83 111  189  57   83 111  189
           -------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND II  .45       .55       .25        1.25        57   83 111  189  57   83 111  189
           -------------------------------------------------------------------------------------------------------
           FOREIGN BOND              .25       .45       .25         .95        54   74  95  156  54   74  95  156
           -------------------------------------------------------------------------------------------------------
           GLOBAL BOND               .25       .45       .25         .95        54   74  95  156  54   74  95  156
           -------------------------------------------------------------------------------------------------------
           GLOBAL BOND II            .25       .45       .25         .95        54   74  95  156  54   74  95  156
           -------------------------------------------------------------------------------------------------------
           INTERNATIONAL BOND        .25       .45       .25         .95        54   74  95  156  54   74  95  156
           -------------------------------------------------------------------------------------------------------
           HIGH YIELD                .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           TOTAL RETURN              .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           TOTAL RETURN II           .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           TOTAL RETURN III          .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           TOTAL RETURN MORTGAGE     .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           COMMERCIAL MORTGAGE
            SECURITIES               .40       .40       .25        1.05        55   77 100  167  55   77 100  167
           -------------------------------------------------------------------------------------------------------
           MODERATE DURATION         .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           REAL RETURN BOND          .25       ,40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           LOW DURATION              .25       .40       .25         .90        39   58  78  137  39   58  78  137
           -------------------------------------------------------------------------------------------------------
           LOW DURATION II           .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           LOW DURATION III          .25       .40       .25         .90        54   72  93  151  54   72  93  151
           -------------------------------------------------------------------------------------------------------
           LOW DURATION MORTGAGE     .25       .40       .25         .90        39   58  78  137  39   58  78  137
           -------------------------------------------------------------------------------------------------------
           SHORT-TERM                .25       .35       .25         .85        29   47  66  123  29   47  66  123
           -------------------------------------------------------------------------------------------------------
           MONEY MARKET              .15       .35       .10(2)      .60(3)      6   19  33   75   6   19  33   75
           -------------------------------------------------------------------------------------------------------
</TABLE>          
 
            1. 12b-1 fees represent servicing fees which are paid annually to
            the Distributor and repaid to participating brokers, certain banks
            and other financial intermediaries. See "Distributor and Distribu-
            tion and Servicing Plans."
            2. The Distributor has voluntarily undertaken to reduce the 12b-1
            fee it receives with respect to the Money Market Fund to .10% of
            the Fund's average daily net assets until further notice. Absent
            such undertaking, the 12b-1 fee would be .20% of the Fund's aver-
            age daily net assets.
            3. Absent the undertaking noted, the "Total Fund Operating Ex-
            penses" for the Money Market Fund would be .70% of the Fund's av-
            erage daily net assets.

                                                             
<PAGE>
 
 
 
<TABLE>        
<CAPTION>
                                                                                EXAMPLE: You would EXAMPLE: You
                                                                                pay the following  would pay the
                                                                                expenses on a      following
                                                                                $1,000 investment  expenses on a
                                                                                assuming (1) 5%    $1,000 investment
                                                                                annual return and  assuming (1) 5%
                                                                                (2) redemption at  annual return and
                                  ANNUAL FUND OPERATING EXPENSES                the end of each    (2) no
                                  (As a percentage of average net assets):      time period:       redemption:
                                                                    TOTAL
                                             ADMINI-                FUND
                                  ADVISORY   STRATIVE   12B-1       OPERATING   YEAR               YEAR
           FUND                   FEE        FEE        FEES(/1/)   EXPENSES    1    3   5    10   1    3   5   10
           ---------------------------------------------------------------------------------------------------------
CLASS B    <S>                    <C>        <C>        <C>         <C>         <C>  <C> <C>  <C>  <C>  <C> <C> <C>
SHARES     STOCKSPLUS             .40%       .40%       1.00%       1.80%       $68  $87 $117 $182 $18  $57 $97 $182
           ---------------------------------------------------------------------------------------------------------
           STOCKSPLUS SHORT                                              
            STRATEGY              .40        .40        1.00        1.80         68   87  117  182  18   57  97  182
           ---------------------------------------------------------------------------------------------------------
           STRATEGIC BALANCED     .40        .40        1.00        1.80         68   87  117  182  18   57  97  182
           ---------------------------------------------------------------------------------------------------------
           LONG-TERM U.S.                                                
            GOVERNMENT            .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           MUNICIPAL BOND         .25        .35        1.00        1.65         66   80  N/A  N/A  16   50 N/A  N/A
           ---------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND  .45        .55        1.00        2.00         70   93  128  204  20   63 108  204
           ---------------------------------------------------------------------------------------------------------
           EMERGING MARKETS                                              
            BOND II               .45        .55        1.00        2.00         70   93  128  204  20   63 108  204
           ---------------------------------------------------------------------------------------------------------
           FOREIGN BOND           .25        .45        1.00        1.70         67   84  112  171  17   54  92  171
           ---------------------------------------------------------------------------------------------------------
           GLOBAL BOND            .25        .45        1.00        1.70         67   84  112  171  17   54  92  171
           ---------------------------------------------------------------------------------------------------------
           GLOBAL BOND II         .25        .45        1.00        1.70         67   84  112  171  17   54  92  171
           ---------------------------------------------------------------------------------------------------------
           INTERNATIONAL BOND     .25        .45        1.00        1.70         67   84  112  171  17   54  92  171
           ---------------------------------------------------------------------------------------------------------
           HIGH YIELD             .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           TOTAL RETURN           .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           TOTAL RETURN II        .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           TOTAL RETURN III       .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           TOTAL RETURN MORTGAGE  .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           COMMERCIAL MORTGAGE                                           
            SECURITIES            .40        .40        1.00        1.80         68   87  117  182  18   57  97  182
           ---------------------------------------------------------------------------------------------------------
           MODERATE DURATION      .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           REAL RETURN BOND       .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           LOW DURATION           .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           LOW DURATION II        .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           LOW DURATION III       .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           LOW DURATION MORTGAGE  .25        .40        1.00        1.65         67   82  110  166  17   52  90  166
           ---------------------------------------------------------------------------------------------------------
           SHORT-TERM             .25        .35        1.00        1.60         66   80  107  160  16   50  87  160
           ---------------------------------------------------------------------------------------------------------
           MONEY MARKET           .15        .35        1.00        1.50         65   77  102  143  15   47  82  143
           ---------------------------------------------------------------------------------------------------------
</TABLE>          
            1. 12b-1 fees which equal or are less than .25% represent servic-
            ing fees which are paid annually to the Distributor and repaid to
            participating brokers, certain banks and other financial interme-
            diaries. 12b-1 fees which exceed .25% represent aggregate distri-
            bution and servicing fees. See "Distributor and Distribution and
            Servicing Plans."
         
<PAGE>
 
<TABLE>     
<CAPTION>
                                                                                            EXAMPLE: You      EXAMPLE: You
                                                                                            would pay the     would pay the
                                                                                            following         following
                                                                                            expenses on a     expenses on a
                                                                                            $1,000 investment $1,000 investment
                                                                                            assuming (1) 5%   assuming (1) 5%
                                                                                            annual return and annual return and
                                                                                            (2) redemption at (2) no
                                     ANNUAL FUND OPERATING EXPENSES                         the end of each   redemption:
                                     (As a percentage of average net assets):               time period:
                                                                            TOTAL
                                     ADVIS-     ADMINI-                     FUND
                                     ORY        STRATIVE   12B-1            OPERATING       YEAR              YEAR
           FUND                      FEE        FEE        FEES(/1/)        EXPENSES        1    3   5   10   1    3   5   10
           ------------------------------------------------------------------------------------------------------------------
CLASS C   <S>                        <C>        <C>        <C>              <C>             <C>  <C> <C> <C>  <C>  <C> <C> <C>
SHARES    STOCKSPLUS                 .40%       .40%        .75%(/2/)       1.55%           $26  $49 $84 $185 $16  $49 $84 $185
          ---------------------------------------------------------------------------------------------------------------------
           STOCKSPLUS SHORT                                                          
            STRATEGY                 .40        .40        1.00             1.80             28   57  97  212  18   57  97  212
          ---------------------------------------------------------------------------------------------------------------------
           STRATEGIC BALANCED        .40        .40        1.00             1.80             28   57  97  212  18   57  97  212
          ---------------------------------------------------------------------------------------------------------------------
           LONG-TERM U.S.                                                            
            GOVERNMENT               .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           MUNICIPAL BOND            .25        .35         .75(/2/)        1.35(/3/)        24   43 N/A  N/A  14   43 N/A  N/A 
          ---------------------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND     .45        .55        1.00             2.00             30   63 108  233  20   63 108  233
          ---------------------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND II  .45        .55        1.00             2.00             30   63 108  233  20   63 108  233
          ---------------------------------------------------------------------------------------------------------------------
           FOREIGN BOND              .25        .45        1.00             1.70             27   54  92  201  17   54  92  201
          ---------------------------------------------------------------------------------------------------------------------
           GLOBAL BOND               .25        .45        1.00             1.70             27   54  92  201  17   54  92  201
          ---------------------------------------------------------------------------------------------------------------------
           GLOBAL BOND II            .25        .45        1.00             1.70             27   54  92  201  17   54  92  201
          ---------------------------------------------------------------------------------------------------------------------
           INTERNATIONAL BOND        .25        .45        1.00             1.70             27   54  92  201  17   54  92  201
          ---------------------------------------------------------------------------------------------------------------------
           HIGH YIELD                .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           TOTAL RETURN              .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           TOTAL RETURN II           .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           TOTAL RETURN III          .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           TOTAL RETURN MORTGAGE     .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           COMMERCIAL MORTGAGE                                                       
            SECURITIES               .40        .40        1.00             1.80             28   57  97  212  18   57  97  212
          ---------------------------------------------------------------------------------------------------------------------
           MODERATE DURATION         .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           REAL RETURN BOND          .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           LOW DURATION              .25        .40         .75             1.40             24   44  77  168  14   44  77  168
          ---------------------------------------------------------------------------------------------------------------------
           LOW DURATION II           .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           LOW DURATION III          .25        .40        1.00             1.65             27   52  90  195  17   52  90  195
          ---------------------------------------------------------------------------------------------------------------------
           LOW DURATION MORTGAGE     .25        .40         .75             1.40             24   44  77  168  14   44  77  168
          ---------------------------------------------------------------------------------------------------------------------
           SHORT-TERM                .25        .35         .55(/2/)        1.15(/3/)        22   37  63  140  12   37  63  140
          ---------------------------------------------------------------------------------------------------------------------
           MONEY MARKET              .15        .35         .10(/2/)         .60(/3/)        16   19  33   75   6   19  33   75
          ---------------------------------------------------------------------------------------------------------------------
</TABLE>      

<PAGE>

            1. 12b-1 fees which equal or are less than .25% represent servic-
            ing fees which are paid annually to the Distributor and repaid to
            participating brokers, certain banks and other financial interme-
            diaries. 12b-1 fees which exceed .25% represent aggregate distri-
            bution and servicing fees. See "Distributor and Distribution and
            Servicing Plans."
                
            2. The Distributor has voluntarily undertaken to reduce the 12b-1
            fee it may receive with respect to each of the StocksPLUS, Short-
            Term, Real Return Bond, Municipal Bond and Money Market Funds to the
            following annual rates based on the Fund's average daily net assets
            until further notice: StocksPLUS--.75%; Short-Term--.55%; Real
            Return Bond--.75%; Municipal Bond--.75%; and Money Market--.10%.
            Absent such undertakings, the 12b-1 fee for each such Fund would be
            as follows: StocksPLUS--1.00%; Short-Term--1.00%; Real Return Bond--
            1.00%; Municipal Bond--1.00%; and Money Market--.20%.      
                
            3. Absent the undertakings noted, the "Total Fund Operating Ex-
            penses" for the StockPLUS, Short-Term and Money Market Funds would
            be as follows (based on average daily net assets): StocksPLUS--
            1.80%; Short-Term--1.60%; Real Return Bond--1.65%; Municipal Bond--
            1.60%; and Money Market--.70%.      
                
              The purpose of the foregoing tables is to assist investors in
            understanding the various costs and expenses of the Trust that are
            borne directly or indirectly by Class A, Class B and Class C
            shareholders of the Funds. The information has been restated to
            reflect the Funds' current fees and expenses. The examples for
            Class A shares assume payment of the current maximum applicable
            sales load. Due to the 12b-1 distribution fee imposed on Class B
            and Class C shares, a Class B or Class C shareholder of the Trust
            may, depending on the length of time the shares are held, pay more
            than the economic equivalent of the maximum front-end sales
            charges permitted by relevant rules of the National Association of
            Securities Dealers, Inc.     
                
            NOTE: THE FIGURES SHOWN IN THE EXAMPLES ARE ENTIRELY HYPOTHETICAL.
            THEY ARE NOT REPRESENTATIONS OF PAST OR FUTURE PERFORMANCE OR EX-
            PENSES; ACTUAL PERFORMANCE AND/OR EXPENSES MAY BE MORE OR LESS
            THAN SHOWN.     
         

<PAGE>

     
Financial Highlights     
    
The following information regarding selected per share data and ratios for
shares of certain of the Funds is part of the Trust's audited financial state-
ments, which are included in the Trust's Annual Report dated March 31, 1998,
which is incorporated by reference in the Statement of Additional Information.
The Trust's audited financial statements and selected per share data and ratios
appearing below have been examined by PricewaterhouseCoopers LLP (formerly
Price Waterhouse LLP) independent accountants, whose opinion thereon is also
included in the Annual Report, which may be obtained without charge. Informa-
tion is presented for each Fund described herein which had investment opera-
tions during the reporting periods. Information regarding the Global Bond Fund
II reflects the operational history of the Global Income Fund, a former series
of PIMCO Advisors Funds that was reorganized as a series of the Trust on Janu-
ary 17, 1997.     
     
Selected data for a share outstanding throughout each period:     
 
<TABLE>    
<CAPTION>
                          NET ASSET              NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS DISTRIBUTIONS
        YEAR OR             VALUE      NET      AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    IN EXCESS OF  
         PERIOD           BEGINNING INVESTMENT  GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    NET REALIZED  
         ENDED            OF PERIOD   INCOME     INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS CAPITAL GAINS  
- --------------------------------------------------------------------------------------------------------------------------------
<S>       <C>             <C>       <C>         <C>            <C>          <C>        <C>           <C>           <C> 
MONEY MARKET FUND
 Class A
          03/31/98         $ 1.00     $0.05(+)      $ 0.00 (+)    $0.05       $(0.05)     $ 0.00        $ 0.00        $ 0.00
          03/31/97(a)        1.00      0.01           0.00         0.01        (0.01)       0.00          0.00          0.00 
 Class B
          03/31/98           1.00      0.04(+)        0.00 (+)     0.04        (0.04)       0.00          0.00          0.00
          03/31/97(a)        1.00      0.01           0.00         0.01        (0.01)       0.00          0.00          0.00 
 Class C
          03/31/98           1.00      0.05(+)        0.00 (+)     0.05        (0.05)       0.00          0.00          0.00
          03/31/96(a)        1.00      0.01           0.00         0.01        (0.01)       0.00          0.00          0.00 
SHORT-TERM FUND
 Class A
          03/31/98         $10.00     $0.55(+)      $ 0.09 (+)    $0.64       $(0.56)     $(0.01)       $ 0.00        $ 0.00
          03/31/97(b)       10.04      0.10          (0.03)        0.07        (0.10)      (0.01)         0.00          0.00
 Class B
          03/31/98          10.00      0.50(+)        0.08 (+)     0.58        (0.50)      (0.01)         0.00          0.00
          03/31/97(b)       10.04      0.09          (0.03)        0.06        (0.10)       0.00          0.00          0.00
 Class C
          03/31/98          10.00      0.54(+)        0.07 (+)     0.61        (0.53)      (0.01)         0.00          0.00
          03/31/97(b)       10.04      0.09          (0.03)        0.06        (0.10)       0.00          0.00          0.00
LOW DURATION FUND
 Class A
          03/31/98         $ 9.98     $0.60(+)      $ 0.23 (+)    $0.83       $(0.58)     $(0.02)       $(0.03)       $ 0.00
          03/31/97(a)       10.02      0.12          (0.03)        0.09        (0.12)      (0.01)         0.00          0.00
 Class B
          03/31/98           9.98      0.53(+)        0.22 (+)     0.75        (0.50)      (0.02)        (0.03)         0.00
          03/31/97(a)       10.02      0.10          (0.03)        0.07        (0.11)       0.00          0.00          0.00
 Class C
          03/31/98           9.98      0.55(+)        0.23 (+)     0.78        (0.53)      (0.02)        (0.03)         0.00
          03/31/97(a)       10.02      0.11          (0.03)        0.08        (0.11)      (0.01)         0.00          0.00
HIGH YIELD FUND
 Class A
          03/31/98         $11.10     $0.93(+)      $ 0.66 (+)    $1.59       $(0.94)     $ 0.00        $ 0.00        $(0.09)
          03/31/97(a)       11.18      0.17          (0.05)        0.12        (0.20)       0.00          0.00          0.00
 Class B
          03/31/98          11.10      0.84(+)        0.66 (+)     1.50        (0.85)       0.00          0.00         (0.09)
          03/31/97(a)       11.18      0.15          (0.05)        0.10        (0.18)       0.00          0.00          0.00
 Class C
          03/31/98          11.10      0.85(+)        0.65 (+)     1.50        (0.85)       0.00          0.00         (0.09)
          03/31/97(a)       11.18      0.15          (0.05)        0.10        (0.18)       0.00          0.00          0.00
</TABLE>     
    
- -------
(+) Per share amounts based on average number of shares outstanding during the
    period.
(a) From commencement of operations, January 13, 1997.
(b) From commencement of operations, January 20, 1997.
    PIMCO Funds: Pacific Investment Management Series     
 

<PAGE>

    
                        FINANCIAL HIGHLIGHTS (CONTINUED)     
<TABLE>    
<CAPTION>
                                                                   RATIO OF NET
                          NET ASSET         NET ASSETS  RATIO OF    INVESTMENT
TAX BASIS                   VALUE              END     EXPENSES TO  INCOME TO   PORTFOLIO
  RETURN        TOTAL        END    TOTAL   OF PERIOD    AVERAGE     AVERAGE    TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN   (000'S)   NET ASSETS   NET ASSETS    RATE
- -----------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>     <C>        <C>         <C>          <C>
  $0.00        $ (0.05)    $ 1.00    5.10%   $ 41,375     0.60%        5.02%       N/A
   0.00          (0.01)      1.00    1.01      43,589     0.57+        4.44+       N/A
   0.00          (0.04)      1.00    4.21       2,937     1.50         4.15        N/A
   0.00          (0.01)      1.00    0.83       3,143     1.41+        3.62+       N/A
   0.00          (0.05)      1.00    5.14      55,696     0.60         5.05        N/A
   0.00          (0.01)      1.00    1.02      85,398     0.58+        4.47+       N/A
  $0.00        $ (0.58)    $10.06    6.64%   $ 24,182     0.85%        5.48%        48%
   0.00          (0.11)     10.00    0.66       2,533     0.86+        5.07+        77
   0.00          (0.52)     10.06    5.96       1,258     1.60         4.97         48
   0.00          (0.10)     10.00    0.58         114     1.62+        4.83+        77
   0.00          (0.55)     10.06    6.33       6,763     1.15         5.33         48
   0.00          (0.10)     10.00    0.63       1,359     1.14+        4.78+        77
  $0.00         $(0.63)    $10.18    8.49%   $109,531     0.90%        5.93%       309%
   0.00          (0.13)      9.98    0.85      59,348     0.91+        5.84+       240
   0.00          (0.55)     10.18    7.68      17,624     1.65         5.16        309
   0.00          (0.11)      9.98    0.68       5,296     1.67+        5.03+       240
   0.00          (0.58)     10.18    8.01      68,766     1.40         5.46        309
   0.00          (0.12)      9.98    0.75      63,606     1.42+        5.36+       240
  $0.00        $()1.03)    $11.66   14.80%   $ 70,858     0.90%        8.02%        37%
   0.00          (0.20)     11.10    1.06      28,873     0.92+        8.28+        67
   0.00          (0.94)     11.66   13.94     156,099     1.65         7.27         37
   0.00          (0.18)     11.10    0.86      60,269     1.67+        7.52+        67
   0.00          (0.94)     11.66   13.95     284,836     1.65         7.36         37
   0.00          (0.18)     11.10    0.88     205,297     1.68+        7.56+        67
</TABLE>     
    
- -------
 +Annualized.     
 

<PAGE>

     
                        FINANCIAL HIGHLIGHTS (CONTINUED)     
 
<TABLE>    
<CAPTION>
                              NET ASSET               NET REALIZED  TOTAL INCOME DIVIDENDS  DIVIDENDS IN  DISTRIBUTIONS 
        YEAR OR                 VALUE      NET       AND UNREALIZED (LOSS) FROM   FROM NET  EXCESS OF NET   FROM NET    
         PERIOD               BEGINNING INVESTMENT   GAIN (LOSS) ON  INVESTMENT  INVESTMENT  INVESTMENT     REALIZED    
         ENDED                OF PERIOD   INCOME      INVESTMENTS    OPERATIONS    INCOME      INCOME     CAPITAL GAINS 
- ------------------------------------------------------------------------------------------------------------------------
<S>                           <C>       <C>          <C>            <C>          <C>        <C>           <C>           
TOTAL RETURN FUND                                                                                                       
 Class A                                                                                                                
          03/31/98            $10.27     $ 0.58 (+)     $ 0.63 (+)    $ 1.21      $(0.57)     $(0.02)       $(0.27)     
          03/31/97(a)          10.40       0.12          (0.12)         0.00       (0.13)       0.00          0.00      
 Class B                                                                                                                
          03/31/98             10.27       0.50 (+)       0.63 (+)      1.13       (0.50)      (0.01)        (0.27)     
          03/31/97(a)          10.40       0.11          (0.12)        (0.01)      (0.12)       0.00          0.00      
 Class C                                                                                                                
          03/31/98             10.27       0.51 (+)       0.63 (+)      1.14       (0.51)      (0.01)        (0.27)     
          03/31/97(a)          10.40       0.11          (0.12)        (0.01)      (0.12)       0.00          0.00      
REAL RETURN BOND FUND                                                                                                   
 Class A                                                                                                                
          03/31/98            $ 9.93     $ 0.40 (+)     $ 0.03 (+)    $ 0.43      $(0.42)     $(0.03)       $(0.14)     
          03/31/97(c)          10.00       0.11 (+)      (0.10)(+)      0.01       (0.08)       0.00          0.00      
 Class B                                                                                                                
          03/31/98              9.93       0.33 (+)       0.03 (+)      0.36       (0.36)      (0.02)        (0.14)     
          03/31/97(c)          10.00       0.09          (0.10)        (0.01)      (0.06)       0.00          0.00      
 Class C                                                                                                                
          03/31/98              9.93       0.35 (+)       0.04 (+)      0.39       (0.38)      (0.03)        (0.14)     
          03/31/97(c)          10.00       0.09          (0.10)        (0.01)      (0.06)       0.00          0.00      
LONG-TERM U.S. GOVERNMENT FUND                                                                                          
 Class A                                                                                                                
          03/31/98            $ 9.39     $ 0.48 (+)     $ 1.34 (+)    $ 1.82      $(0.58)     $ 0.00        $(0.06)     
          03/31/97(b)           9.67       0.32          (0.47)        (0.15)      (0.13)       0.00          0.00      
 Class B                                                                                                                
          03/31/98              9.39       0.39 (+)       1.35 (+)      1.74       (0.50)       0.00         (0.06)     
          03/31/97(b)           9.67       0.29          (0.47)        (0.18)      (0.10)       0.00          0.00      
 Class C                                                                                                                
          03/31/98              9.39       0.39 (+)       1.35 (+)      1.74       (0.50)       0.00         (0.06)     
          03/31/97(b)           9.67       0.29          (0.47)        (0.18)      (0.10)       0.00          0.00      
FOREIGN BOND FUND                                                                                                       
 Class A                                                                                                                
          03/31/98            $10.41     $ 0.61 (+)     $ 0.62 (+)    $ 1.23      $(0.59)     $ 0.00        $(0.31)     
          03/31/97(b)          10.59       0.59          (0.72)        (0.13)      (0.05)       0.00          0.00      
 Class B                                                                                                                
          03/31/98             10.41       0.53 (+)       0.61 (+)      1.14       (0.50)       0.00         (0.31)     
          03/31/97(b)          10.59       0.58          (0.72)        (0.14)      (0.04)       0.00          0.00      
 Class C                                                                                                                
          03/31/98             10.41       0.52 (+)       0.62 (+)      1.14       (0.50)       0.00         (0.31)     
          03/31/97(b)          10.59       0.58          (0.72)        (0.14)      (0.04)       0.00          0.00      
GLOBAL BOND FUND II                                                                                                     
 Class A                                                                                                                
          03/31/98            $10.84     $ 0.64 (+)     $ 0.51 (+)    $ 1.15      $ 0.00      $(0.54)       $(1.53)     
          10/01/96--03/31/97   10.96       0.66          (0.16)         0.50       (0.22)       0.00         (0.40)     
          09/30/96(d)          10.00       0.32 (e)       0.95          1.27       (0.31)       0.00          0.00      
 Class B                                                                                                                
          03/31/98             10.84       0.66 (+)       0.41 (+)      1.07        0.00       (0.46)        (1.53)     
          10/01/96--03/31/97   10.96       0.62          (0.16)         0.46       (0.18)       0.00         (0.40)     
          09/30/96(d)          10.00       0.30 (e)       0.92          1.22       (0.26)       0.00          0.00      
 Class C                                                                                                                
          03/31/98             10.84       0.55 (+)       0.52 (+)      1.07        0.00       (0.46)        (1.53)     
          10/01/96--03/31/97   10.96       0.62          (0.16)         0.46       (0.18)       0.00         (0.40)     
          09/30/96(d)          10.00       0.30 (e)       0.92          1.22       (0.26)       0.00          0.00      
EMERGING MARKETS BOND FUND                                                                                              
 Class A                                                                                                                
          03/31/98(f)         $10.00     $ 0.44 (+)     $(0.18)(+)    $ 0.26      $(0.44)     $ 0.00        $(0.15)     
 Class B                                                                                                                
          03/31/98(f)          10.00       0.40 (+)     (0.20)(+)       0.20       (0.38)       0.00         (0.15)     
 Class C                                                                                                                
          09/30/97(f)          10.00       0.38 (+)      (0.18)(+)      0.20       (0.38)       0.00         (0.15)     
STOCKSPLUS FUND                                                                                                         
 Class A                                                                                                                
          03/31/98            $11.46     $ 1.66 (+)     $ 3.41 (+)    $ 5.07      $(1.38)     $ 0.00        $(1.09)     
          03/31/97(b)          11.91      (0.10)         (0.20)        (0.30)      (0.15)       0.00          0.00      
 Class B                                                                                                                
          03/301/98            11.44       1.61 (+)       3.35 (+)      4.96       (1.30)       0.00         (1.09)     
          03/31/97(b)          11.91      (0.13)         (0.20)        (0.33)      (0.14)       0.00          0.00      
 Class C                                                                                                                
          03/31/98             11.45       1.64 (+)       3.35 (+)      4.99       (1.32)       0.00         (1.09)     
          03/31/97(b)          11.91      (0.12)         (0.20)        (0.32)      (0.14)       0.00          0.00      
<CAPTION>
                                DISTRIBUTIONS
        YEAR OR                 IN EXCESS OF
         PERIOD                 NET REALIZED
         ENDED                  CAPITAL GAINS
- -------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>       
TOTAL RETURN FUND
 Class A
          03/31/98                  $0.00
          03/31/97(a)                0.00
 Class B                      
          03/31/98                   0.00
          03/31/97(a)                0.00
 Class C                      
          03/31/98                   0.00
          03/31/97(a)                0.00
REAL RETURN BOND FUND         
 Class A                      
          03/31/98                  $0.00
          03/31/97(c)                0.00
 Class B                      
          03/31/98                   0.00
          03/31/97(c)                0.00
 Class C                      
          03/31/98                   0.00
          03/31/97(c)                0.00
LONG-TERM U.S. GOVERNMENT FUND
 Class A                      
          03/31/98                  $0.00
          03/31/97(b)                0.00
 Class B                      
          03/31/98                   0.00
          03/31/97(b)                0.00
 Class C                      
          03/31/98                   0.00
          03/31/97(b)                0.00
FOREIGN BOND FUND             
 Class A                      
          03/31/98                  $0.00
          03/31/97(b)                0.00
 Class B                      
          03/31/98                   0.00
          03/31/97(b)                0.00
 Class C                      
          03/31/98                   0.00
          03/31/97(b)                0.00
GLOBAL BOND FUND II           
 Class A                      
          03/31/98                  $0.00
          10/01/96--03/31/97         0.00
          09/30/96(d)                0.00
 Class B                      
          03/31/98                   0.00
          10/01/96--03/31/97         0.00
          09/30/96(d)                0.00
 Class C                      
          03/31/98                   0.00
          10/01/96--03/31/97         0.00
          09/30/96(d)                0.00
EMERGING MARKETS BOND FUND    
 Class A                      
          03/31/98(f)               $0.00
 Class B                      
          03/31/98(f)                0.00
 Class C                      
          09/30/97(f)                0.00
STOCKSPLUS FUND               
 Class A                      
          03/31/98                  $0.00
          03/31/97(b)                0.00
 Class B                      
          03/301/98                  0.00
          03/31/97(b)                0.00
 Class C                      
          03/31/98                   0.00
          03/31/97(b)                0.00
</TABLE>     
    
- -------
(c) From commencement of operations, January 29, 1997.
(d) From commencement of operations, October 2, 1995.
(e) Reflects voluntary waiver of investment advisory fee of $12,041 (.01 per
    share) by the Adviser.
(f) From commencement of operations, July 31, 1997.     


<PAGE>

     
                        FINANCIAL HIGHLIGHTS (CONTINUED)     
<TABLE>    
<CAPTION>
                                                                   RATIO OF NET
                          NET ASSET         NET ASSETS  RATIO OF    INVESTMENT
TAX BASIS                   VALUE              END     EXPENSES TO  INCOME TO   PORTFOLIO
  RETURN        TOTAL        END    TOTAL   OF PERIOD    AVERAGE     AVERAGE    TURNOVER
OF CAPITAL  DISTRIBUTIONS OF PERIOD RETURN   (000'S)   NET ASSETS   NET ASSETS    RATE
- -----------------------------------------------------------------------------------------
<S>         <C>           <C>       <C>     <C>        <C>         <C>          <C>
  $0.00        $(0.86)     $10.62   12.11%   $533,893     0.90%         5.46%       206%
   0.00         (0.13)      10.27    0.02     115,742     0.91+         6.08+       173
   0.00         (0.78)      10.62   11.26     186,932     1.65          4.74        206
   0.00         (0.12)      10.27   (0.10)     74,130     1.67+         5.28+       173
   0.00         (0.79)      10.62   11.28     405,037     1.65          4.83        206
   0.00         (0.12)      10.27   (0.11)    329,104     1.67+         5.32+       173
  $0.00        $(0.59)     $ 9.77    4.12%   $    370     0.92%         4.06%       967%
   0.00         (0.08)       9.93    0.15           1     0.90+         6.14+       160
   0.00         (0.52)       9.77    3.50       1,496     1.67          3.32        967
   0.00         (0.06)       9.93   (0.08)        509     1.59+         3.43+       160
   0.00         (0.55)       9.77    3.73         490     1.42          3.56        967
   0.00         (0.06)       9.93   (0.07)        148     1.62+         5.13+       160
  $0.00        $(0.64)     $10.57   19.78%   $  6,161     0.91%         4.49%       177%
   0.00         (0.13)       9.39   (1.72)      1,204     1.12+         6.91+       402
   0.00         (0.56)      10.57   18.85       7,516     1.66          4.64        177
   0.00         (0.10)       9.39   (1.92)        454     1.87+         4.95+       402
   0.00         (0.56)      10.57   18.86       7,258     1.66          4.64        177
   0.00         (0.10)       9.39   (1.83)        275     1.88+         5.52+       402
  $0.00        $(0.90)     $10.74   12.14%   $  9,582     0.95%         5.88%       280%
   0.00         (0.05)      10.41   (1.21)        704     0.97+         4.95+       984
   0.00         (0.81)      10.74   11.29      10,631     1.70          5.13        280
   0.00         (0.04)      10.41   (1.34)      1,221     1.75+         3.73+       984
   0.00         (0.81)      10.74   11.29      17,080     1.70          5.13        280
   0.00         (0.04)      10.41   (1.32)      1,788     1.76+         4.09+       984
  $0.00        $(2.07)     $ 9.92   11.21%   $  6,816     0.95%         5.88%       369%
   0.00         (0.62)      10.84    4.55       7,652     2.05+         5.60+       307
   0.00         (0.31)      10.96   15.01       7,360     1.27(g)       4.88(h)   1,246
   0.00         (1.99)       9.92   10.39       4,473     1.70          5.12        369
   0.00         (0.58)      10.84    4.17       3,925     2.57+         4.22+       307
   0.00         (0.26)      10.96   14.54       3,240     2.49(g)       4.09(h)   1,246
   0.00         (1.99)       9.92   10.39       6,096     1.70          5.12        369
   0.00         (0.58)      10.84    4.17       5,323     2.43+         4.14+       307
   0.00         (0.26)      10.96   14.54       3,459     2.49(g)       4.09(h)   1,246
  $0.00        $(0.59)     $ 9.67    2.84%   $    317     1.26%         6.93%       695%
   0.00         (0.53)       9.67    2.29         304     2.01          6.33        695
   0.00         (0.53)       9.67    2.29         136     2.01          6.11        695
  $0.00        $(2.47)     $14.06   47.07%   $ 62,970     1.05%        13.34%        30%
   0.00         (0.15)      11.46   (2.59)      5,790     1.10+       (10.69)+       47
   0.00         (2.39)      14.01   46.11      99,039     1.80         12.60         30
   0.00         (0.14)      11.44   (2.81)      8,281     1.88+       (15.13)+       47
   0.00         (2.41)      14.03   46.38      96,960     1.55         12.85         30
   0.00         (0.14)      11.45   (2.71)     11,254     1.65+       (12.79)+       47
</TABLE>     
    
- -------
 +  Annualized.
(g) The Ratio of Expenses to Average Net Assets without the waiver would have
    been 1.57%.
(h) The Ratio of Net Investment Income to Average Net Assets without the waiver
    would have been 4.58%.      
<PAGE>

              Investment Objectives and Policies
                  
              The investment objective and general investment policies of each
              Fund are described below. There can be no assurance that the in-
              vestment objective of any Fund will be achieved. For temporary,
              defensive or emergency purposes, a Fund may invest without limit
              in U.S. debt securities, including short-term money market securi-
              ties, when in the opinion of the Advisor it is appropriate to do
              so. It is impossible to predict for how long such alternative
              strategies will be utilized. The value of all securities and other
              instruments held by the Funds will vary from time to time in re-
              sponse to a wide variety of market factors. Consequently, the net
              asset value per share of each Fund will vary, except that the
              Money Market Fund will attempt to maintain a net asset value of
              $1.00 per share, although there can be no assurance that the Fund
              will be successful in doing so.     
                  
                 The investment objective of the Global Bond Fund II described
              in this Prospectus may be changed by the Board of Trustees without
              shareholder approval. The investment objective of each other Fund
              is fundamental and may not be changed without shareholder approval
              by vote of a majority of the outstanding shares of that Fund. If
              there is a change in a Fund's investment objective, including a
              change approved by a shareholder vote, shareholders should con-
              sider whether the Fund remains an appropriate investment in light
              of their then current financial position and needs.     
                 Specific portfolio securities eligible for purchase by the
              Funds, investment techniques that may be used by the Funds, and
              the risks associated with these securities and techniques are de-
              scribed more fully under "Characteristics and Risks of Securities
              and Investment Techniques" in the Prospectus and "Investment Ob-
              jectives and Policies" in the Statement of Additional Information.
    
EQUITY FUND   The Equity Funds are the StocksPLUS Fund and the StocksPLUS Short
DESCRIPTIONS  Strategy Fund. The investment objective of the StockPLUS Fund is
              to seek to achieve a total return which exceeds the total return
              performance of the Standard & Poor's Composite Stock Price Index
              ("S&P 500"). The investment objective of the StocksPLUS Short
              Strategy Fund is to seek total return through the implementation
              of short investment positions on the S&P 500.     
                  
                 Each of the Equity Funds invests in common stocks, options,
              futures, options on futures and swaps consistent with its portfo-
              lio management strategy as set forth below. Assets not invested in
              equity securities may be invested in securities eligible for pur-
              chase by the Fixed Income Funds. Each of the Equity Funds may in-
              vest up to 10% of its assets in fixed income securities that are
              below "investment grade," i.e., rated below Baa by Moody's or BBB
              by S&P, but at least B (or, if unrated, determined by the Advisor
              to be of comparable quality). In addition, each of the Equity
              Funds may lend its portfolio securities to brokers, dealers and
              other financial institutions in order to earn income. Each of the
              Equity Funds may invest all of its assets in derivative instru-
              ments, as described below and under "Characteristics of Securities
              and Investment Techniques--Derivative Instruments." Each of the
              Equity Funds may invest up to 20% of its assets in securities of
              foreign issuers, may purchase and sell options and futures on for-
              eign currencies, and may enter into forward foreign currency con-
              tracts.     
                 The Equity Funds differ in composition or strategy as follows:
                  
              STOCKSPLUS FUND StocksPLUS is the name of a proprietary portfolio
              management strategy which utilizes S&P 500 derivatives in addition
              to or in place of S&P 500 stocks to equal or exceed the perfor-
              mance of the S&P 500. The Advisor expects that under normal market
              conditions, the Fund will invest substantially all of its assets
              in S&P 500 derivatives, backed by a portfolio of fixed income se-
              curities. The Advisor will actively manage the fixed income assets
              serving as cover for derivatives, as well as any other fixed in-
              come assets held by the Fund, with a view toward enhancing the
              Fund's total return investment performance, subject to an overall
              portfolio duration which is normally not expected to exceed one
              year. See "Appendix A--Description of Duration."     
                 The S&P 500 is composed of 500 selected common stocks, most of
              which are listed on the New York Stock Exchange. Standard and
              Poor's ("S&P") chooses the stocks to be included in the S&P 500
              solely on a statistical basis.
           
<PAGE>
 
            The weightings of stocks in the index are based on each stock's
            relative total market value, that is, its market price per share
            times the number of shares outstanding. Stocks represented cur-
            rently in the S&P 500 represent approximately two-thirds of the
            total market value of all U.S. common stocks. The Fund is neither
            sponsored by nor affiliated with S&P. The Fund will seek to remain
            invested in S&P 500 derivatives or S&P 500 stocks even when the
            S&P 500 is declining.     
               When S&P 500 derivatives appear to be overvalued relative to
            the S&P 500, the Fund may invest up to 100% of its assets in a
            "basket" of S&P 500 stocks. The composition of this basket will be
            determined by standard statistical techniques that analyze the
            historical correlation between the return of every stock currently
            in the S&P 500 and the return on the S&P 500 itself. The Advisor
            may employ fundamental stock analysis only to choose among stocks
            that have already satisfied the statistical correlation tests.
            Stocks chosen for the Fund are not limited to those with any par-
            ticular weighting in the S&P 500.
               Positions in S&P 500 futures and options on futures will be en-
            tered into only to the extent they constitute permissible posi-
            tions for the Fund according to applicable rules of the Commodity
            Futures Trading Commission ("CFTC"). From time to time, the Advi-
            sor may be constrained in its ability to use S&P 500 derivatives
            either by requirements of the Internal Revenue Code or by an unan-
            ticipated inability to close out positions when it would be most
            advantageous to do so. A large number of investors use S&P 500 de-
            rivatives for both hedging and speculative purposes, and although
            generally this helps guarantee a liquid market in those instru-
            ments, at times liquidity may be limited. For more information
            about S&P 500 derivatives, see "Characteristics and Risks of Secu-
            rities and Investment Techniques--Derivative Instruments."
                 
               To the extent that the Fund invests in S&P 500 derivatives backed
            by a portfolio of fixed income securities, under certain conditions,
            generally in a market where the value of both S&P 500 derivatives
            and fixed income securities are declining, the Fund may experience
            greater losses than would be the case if it were to invest directly
            in a portfolio of S&P 500 stocks.      

            STOCKSPLUS SHORT STRATEGY FUND invests primarily in S&P 500 short
            positions such that the Fund's net asset value is generally ex-
            pected to vary inversely to the value of the S&P 500. The Fund is
            designed for investors seeking to take advantage of declines in
            the value of the S&P 500, or investors wishing to hedge existing
            long equity positions. The Fund will generally realize gains only
            when the price of the S&P 500 Index is declining. When the S&P 500
            is rising, the Fund will generally incur a loss.
               The Fund will maintain short positions through the use of a
            combination of S&P 500 derivatives, including options, futures and
            swap agreements. All S&P 500 derivatives will be covered by the
            maintenance of a segregated account consisting of assets deter-
            mined to be liquid by the Advisor in accordance with procedures
            established by the Board of Trustees, or through the maintenance
            of offsetting positions. It is anticipated that the Fund will gen-
            erally remain fully invested in S&P 500 short positions at all
            times, even during periods when the S&P 500 Index is rising. How-
            ever, the Fund may purchase call options on S&P 500 futures con-
            tracts from time to time in an effort to limit the total potential
            decline in the Fund's net asset value. There can be no assurance
            that the use of such call options would be effective in limiting
            the potential decline in net asset value of the Fund.
               The Advisor will actively manage the fixed income portion of
            the Fund's investment portfolio that is used as coverage for S&P
            500 derivatives in an attempt to provide incremental returns.
            Thus, there will not be a perfect inverse correlation between the
            performance of the S&P 500 and the performance of the Fund. A per-
            fect inverse correlation would exist if the net asset value of the
            Fund, including the value of its dividend and capital gains dis-
            tributions, increased in exact proportion to decreases in the S&P
            500 (or decreased in exact proportion to increases in the S&P
            500). Rather, because of the Advisor's management of the fixed in-
            come securities that are held by the Fund as cover for the Fund's
            short positions, it is expected that, if the value of the S&P 500
            were to decrease by 10%, for example, the amount by which the
            Fund's net asset value would increase would be an amount slightly
            in excess of 10%. Conversely, an increase in the S&P 500 of 10%
            would result in a loss to the Fund of slightly less than this
            amount. There can be no assurance that the use of such active
            fixed income management techniques will produce the intended re-
            sults.

         
<PAGE>
                
BALANCED      STRATEGIC BALANCED FUND has as its investment objective the maxi-
FUND          mization of total return, consistent with preservation of capital
DESCRIPTION   and prudent investment management. In seeking to achieve this ob-
              jective, the Fund invests in the securities eligible for purchase
              by the StocksPLUS Fund and the Total Return Fund. The percentage
              of the Fund's assets allocated to equity or fixed income exposure
              will vary in accordance with an asset allocation methodology de-
              veloped by the Advisor. The methodology builds upon the Advisor's
              long-standing process of economic forecasting of business cycle
              stages by applying to this process a disciplined asset allocation
              model which employs certain statistical variance techniques. De-
              pending on the outcome of this asset allocation methodology, the
              Fund's equity exposure will vary between 45% and 75% of its total
              assets, and its fixed income exposure will vary between 25% and
              55%. There can be no assurance that the Advisor's asset allocation
              methodology will be successful.
 
 
FIXED         With the exception of the StocksPLUS, StocksPLUS Short Strategy
INCOME FUND   and Strategic Balanced Funds, each remaining Fund (together, the
DESCRIPTIONS  "Fixed Income Funds") differs from the others primarily in the
              length of the Fund's duration or the proportion of its investments
              in certain types of fixed income securities. For a discussion of
              the concept of duration, see "Appendix A--Description of Dura-
              tion."
                  
                 The investment objective of the Global Bond Fund II is to seek
              maximum total return, consistent with the preservation of capital.
              The investment objective of the Real Return Bond Fund is to seek
              to realize maximum real return, consistent with the preservation
              of real capital and prudent investment management. For a discus-
              sion of "real return," see "Total Return and Real Return," below.
              The investment objective of the Money Market Fund and Short-Term
              Fund is to seek to obtain maximum current income consistent with
              preservation of capital and daily liquidity. The Money Market Fund
              also attempts to maintain a stable net asset value of $1.00 per
              share, although there can be no assurance that it will be success-
              ful in doing so. Each of the remaining Fixed Income Funds seeks to
              maximize total return, consistent with preservation of capital and
              prudent investment management.     
                 In selecting securities for each Fixed Income Fund, the Advisor
              utilizes economic forecasting, interest rate anticipation, credit
              and call risk analysis, foreign currency exchange rate forecast-
              ing, and other security selection techniques. The proportion of
              each Fund's assets committed to investment in securities with par-
              ticular characteristics (such as maturity, type and coupon rate)
              will vary based on the Advisor's outlook for the U.S. and foreign
              economies, the financial markets, and other factors.

                                    
                 Each of the Fixed Income Funds will invest at least 65% of its
              assets in the following types of securities, which, unless specif-
              ically provided otherwise in the descriptions of the Funds that
              follow, may be issued by domestic or foreign entities and denomi-
              nated in U.S. dollars or foreign currencies: securities issued or
              guaranteed by the U.S. Government, its agencies or instrumentali-
              ties ("U.S. Government securities"); corporate debt securities,
              including convertible securities and corporate commercial paper;
              mortgage-backed and other asset-backed securities; inflation-in-
              dexed bonds issued both by governments and corporations; struc-
              tured notes, including hybrid or "indexed" securities, catastrophe
              bonds, and loan participations; delayed funding loans and
              revolving credit facilities; bank certificates of deposit, fixed
              time deposits and bankers' acceptances; repurchase agreements and
              reverse repur-chase agreements; obligations of foreign governments
              or their sub-divisions, agencies and instrumentalities; and
              obligations of in-ternational agencies or supranational entities.
              Fixed income secu-rities may have fixed, variable, or floating
              rates of interest, including rates of interest that vary inversely
              at a multiple of a designated or floating rate, or that vary
              according to changes in relative values of currencies. Each of the
              Fixed Income Funds may hold different percentages of its assets in
              these various types of securities, and each Fund, except the Money
              Market Fund, may in-vest all of its assets in derivative
              instruments or in mortgage-or asset-backed securities. Each of the
              Fixed Income Funds, except the Money Market Fund, may adhere to
              its investment policy by en-entering into a series of purchase and
              sale contracts or utilizing other investment techniques by which
              it may obtain market exposure to the securities in which it
              primarily invests.       
          
<PAGE>
 
               In addition, each of the Fixed Income Funds may lend its port-
            folio securities to brokers, dealers and other financial institu-
            tions in order to earn income. Each of the Fixed Income Funds may
            purchase and sell options and futures subject to the limits dis-
            cussed below, engage in credit spread trades and enter into for-
            ward foreign currency contracts.     
                
               Each of the Real Return Bond, Foreign Bond, Global Bond, Global
            Bond II, International Bond, Emerging Markets Bond, and Emerging
            Markets Bond II Funds will normally invest at least 80% of its to-
            tal assets in "bonds." For this purpose, each of these Funds con-
            siders the various types of debt or fixed income securities in
            which it invests, as specifically described elsewhere in this Pro-
            spectus, to be "bonds" as referenced in that Fund's name. The use
            of this name is not meant to restrict a Fund's investment to the
            narrow category of debt securities that are formally called
            "bonds."     
                
               As a non-fundamental, operating policy, the Advisor intends to
            use foreign currency-related derivative instruments (currency
            futures and related options, currency options, forward contracts
            and swap agreements) in an effort to hedge foreign currency risk
            with respect to at least 75% of the assets of the Fixed Income
            Funds (other than the Global Bond, Emerging Markets Bond, and
            Emerging Markets Bond II Funds) denominated in currencies other
            than the U.S. dollar. There can be no assurance that the Advisor
            will be successful in doing so. The active use of currency
            derivatives involves transaction costs which may adversely effect
            yield and return.     
               The compositions of the Fixed Income Funds differ as follows:
                
            LONG-TERM U.S. GOVERNMENT FUND invests in a diversified portfolio
            of primarily U.S. Government securities, which may be represented
            by futures contracts (including related options) with respect to
            such securities, and options on such securities, when the Advisor
            deems it appropriate to do so. The Fund will have a minimum aver-
            age portfolio duration of eight years. For point of reference, the
            dollar-weighted average portfolio maturity of the Fund is normally
            expected to be more than ten years. The total rate of return is
            expected to exhibit more volatility than that of the other Fixed
            Income Funds due to the greater investment risk normally associ-
            ated with longer duration investments. The Long-Term U.S. Govern-
            ment Fund's investments in fixed income securities are limited to
            those of U.S. dollar-denominated securities of domestic and for-
            eign issuers that are rated at least A by Moody's Investors Serv-
            ice, Inc. ("Moody's") or Standard & Poor's Corporation ("S&P")
            (or, if unrated, determined by the Advisor to be of comparable
            quality). In addition, the Fund will not acquire a security if, as
            a result, more than 10% of the Fund's total assets would be in-
            vested in securities rated below Aa by Moody's or below AA by S&P,
            or if more than 25% of the Fund's total assets would be invested
            in securities rated Aa by Moody's or AA by S&P.     
                
            PIMCO EMERGING MARKETS BOND FUND invests in a portfolio of fixed
            income securities denominated in foreign currencies and the U.S.
            dollar. Under normal market conditions, the Fund will invest at
            least 80% of its assets in fixed income securities of issuers that
            economically are tied to countries with emerging securities mar-
            kets. The Fund may invest up to 20% of its assets in other types
            of fixed income instruments, including securities of issuers lo-
            cated in, or securities denominated in currencies of, countries
            with developed foreign securities markets. The Fund also may in-
            vest up to 10% of its assets in shares of investment companies
            that invest primarily in emerging market debt securities. The av-
            erage portfolio duration of the Fund will vary based on the Advis-
            or's view of the potential for total return offered by a particu-
            lar duration strategy and, under normal market conditions, is not
            expected to exceed eight years.     
                
               The Advisor has broad discretion to identify and invest in
            countries that it considers to qualify as emerging securities mar-
            kets. However, the Advisor generally considers an emerging securi-
            ties market to be one located in any country that is defined as an
            emerging or developing economy by any of the following: the Inter-
            national Bank for Reconstruction and Development (i.e., the World
            Bank), including its various offshoots, such as the International
            Finance Corporation, or the United Nations or its authorities. The
            Fund's investments in emerging market fixed in-     

                                                            
<PAGE>
                
            come securities may be represented by futures contracts (including
            related options) with respect to such securities, options on such
            securities, equity securities (including common stocks) upon the
            conversion of convertible securities, or securities the return on
            which is derived primarily from emerging securities markets, when
            the Advisor deems it appropriate to do so.     
                
               The Fund emphasizes countries with relatively low gross
            national product per capita and with the potential for rapid
            economic growth. The Advisor will select the Fund's country and
            currency composition based on its evaluation of relative interest
            rates, inflation rates, exchange rates, monetary and fiscal
            policies, trade and current account balances, and any other
            specific factors the Advisor believes to be relevant. The Fund
            likely will concentrate its investments in Asia, Africa, the
            Middle East, Latin America and the developing countries of Europe.
            Accordingly, the Fund will be particularly susceptible to the
            effects of political and economic developments in these regions.
            This effect may be exacerbated by a relative scarcity of issuers
            in certain of these markets, which may result in the Fund being
            highly concentrated in a small number of issuers. For a further
            discussion of the special risks of investing in foreign and
            emerging market countries, see "Characteristics and Risks of
            Securities and Investment Techniques--Foreign Securities."     
                
               The Fund may invest substantially all of its assets in
            securities rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Advisor to be of
            comparable quality). Such securities are colloquially referred to
            as "junk bonds." While these securities generally provide greater
            potential opportunity for capital appreciation and higher yields
            than investments in higher rated securities, they also entail
            greater risk, including the possibility of default or bankruptcy
            of the issuer of the securities. Risk of default or bankruptcy may
            be greater in periods of economic uncertainty or recession, as the
            issuers may be less able to withstand general economic downturns
            affecting the regions in which the Fund invests. The Advisor seeks
            to reduce risk through diversification, credit analysis and
            attention to current developments and trends in emerging market
            economies and markets. The value of most fixed income securities,
            including those held by the Fund, can be expected to change
            inversely with interest rates. For a further discussion of the
            special risks of investing in lower rated securities, see
            "Characteristics and Risks of Securities and Investment
            Techniques--High Yield Securities ("Junk Bonds")."     
                
            PIMCO EMERGING MARKETS BOND FUND II has the same policies as the
            PIMCO Emerging Markets Bond Fund, except that it is available only
            to private account clients of PIMCO.     
 
            FOREIGN BOND FUND invests in a portfolio of fixed income securi-
            ties primarily denominated in major foreign currencies and baskets
            of foreign currencies (such as the European Currency Unit, or
            "ECU"). The Advisor will invest the assets of the Fund in a number
            of international bond markets so that, under normal circumstances,
            the Fund will invest at least 85% of its assets in securities of
            issuers located outside the United States, representing at least
            three foreign countries, which may be represented by futures con-
            tracts (including related options) with respect to such securi-
            ties, and options on such securities, when the Advisor deems it
            appropriate to do so. The Fund may invest up to 10% of its assets
            in fixed income securities that are rated below investment grade
            but rated B or higher by Moody's or S&P (or, if unrated, deter-
            mined by the Advisor to be of comparable quality). For information
            on the risks associated with investments in securities rated below
            investment grade, see "Appendix B--Description of Securities Rat-
            ings." The average portfolio duration of this Fund will normally
            vary within a three- to six-year time frame.
 
            GLOBAL BOND FUND invests in a portfolio of fixed income securities
            denominated in major currencies, baskets of foreign currencies
            (such as the ECU), and the U.S. dollar. Under normal circumstanc-
            es, at least 65% of the Fund's assets will be invested in fixed
            income securities of issuers located in at least three countries
            (one of which may be the United States), which may be represented
            by futures contracts (including related options) with respect to
            such securities, and
 
       
<PAGE>
                 
            options on such securities, when the Advisor deems it appropriate
            to do so. Depending on the Advisor's current opinion as to the
            proper allocation of assets among domestic and foreign issuers,
            investments in the securities of issuers located outside the
            United States will normally vary between 25% and 75% of the Fund's
            assets. The Fund may invest up to 10% of its assets in fixed in-
            come securities that are rated below investment grade but rated B
            or higher by Moody's or S&P (or, if unrated, determined by the Ad-
            visor to be of comparable quality). For information on the risks
            associated with investments in securities rated below investment
            grade, see "Appendix B--Description of Securities Ratings." The
            average portfolio duration of this Fund will normally vary within
            a three- to six-year time frame.
 
            GLOBAL BOND FUND II has the same policies as the Global Bond Fund
            except as set forth below. The Global Bond Fund II expects to
            hedge its foreign currency exposure so that generally no more than
            25% of the Fund's total net assets will be invested in unhedged
            foreign currency-denominated securities. The Global Bond Fund II
            may not borrow in excess of 10% of the value of its total assets
            and then only from banks as a temporary measure to facilitate the
            meeting of redemption requests (not for leverage), or for extraor-
            dinary or emergency purposes. The Global Bond Fund II may only en-
            gage in short sales that are "against the box," and may not loan
            its portfolio securities if their market value exceeds 25% of the
            total assets of the Fund. In addition, the Global Bond Fund II is
            subject to different fundamental and non-fundamental investment
            restrictions than the Global Bond Fund. See "Investment Restric-
            tions" in the Statement of Additional Information.
               The Foreign Bond Fund differs from the Global Bond and Global
            Bond II Funds primarily in the extent to which assets are invested
            in the securities of issuers located outside the United States.
            The Advisor will select these Funds' foreign country and currency
            compositions based on an evaluation of relative interest rates,
            exchange rates, monetary and fiscal policies, trade and current
            account balances, and any other specific factors the Advisor be-
            lieves to be relevant.
 
            INTERNATIONAL BOND FUND invests in a portfolio of fixed income se-
            curities denominated in major foreign currencies, baskets of for-
            eign currencies, and the U.S. dollar. The Advisor will invest the
            assets of the Fund in a number of international bond markets so
            that, under normal conditions, the Fund will invest at least 65%
            of its assets in fixed income securities of foreign issuers repre-
            senting at least three foreign countries or currencies, which may
            be represented by futures contracts (including related options)
            with respect to such securities, and options on such securities,
            when the Advisor deems it appropriate to do so. The International
            Bond Fund will invest only in investment grade securities, i.e.,
            in securities rated at least Baa by Moody's or BBB by S&P (or, if
            unrated, deemed by the Advisor to be of comparable quality). The
            average portfolio duration of this Fund will vary based on the
            strategy currently being used by the Advisor in managing the as-
            sets of the Fund within the overall PIMCO private account manage-
            ment program, but is normally not expected to exceed eight years.
            The Advisor will select the Fund's foreign country and currency
            composition based on its evaluation of relative interest rates,
            inflation rates, exchange rates, monetary and fiscal policies,
            trade and current account balances, and any other specific factors
            the Advisor believes to be relevant.
          
            HIGH YIELD FUND invests under normal circumstances at least 65% of
            its assets in a diversified portfolio of fixed income securities
            rated lower than Baa by Moody's or lower than BBB by S&P but rated
            at least B by Moody's or S&P (or, if unrated, determined by the
            Advisor to be of comparable quality). Such securities are collo-
            quially referred to as "junk bonds." The remainder of the Fund's
            assets may be invested in investment grade fixed income securities
            (i.e., securities rated at least Baa by Moody's or BBB by S&P, or,
            if unrated, deemed by the Advisor to be of comparable quality).
            The average portfolio duration of this Fund will normally vary
            within a two- to six-year time frame depending on the Advisor's
            view of the potential for total return offered by a particular du-
            ration strategy. The Fund may invest in securities of foreign is-
            suers, but only those that are U.S. dollar-denominated. The Fund
            may also engage in hedging strategies involving equity options.

                                                            
<PAGE>
 
               Investments in high yield securities, while generally providing
            greater potential opportunity for capital appreciation and higher
            yields than investments in higher rated securities, also entail
            greater risk, including the possibility of default or bankruptcy
            of the issuer of such securities. Risk of default or bankruptcy
            may be greater in periods of economic uncertainty or recession, as
            the issuers of high yield securities may be less able to withstand
            general economic downturns. The Advisor seeks to reduce risk
            through diversification, credit analysis and attention to current
            developments and trends in both the economy and financial markets.
            The value of all fixed income securities, including those held by
            the Fund, can be expected to change inversely with interest rates.
            For a further discussion of the special risks of investing in
            lower rated securities, see "Characteristics and Risks of Securi-
            ties and Investment Techniques--High Yield Securities ("Junk
            Bonds")."     
 
            TOTAL RETURN FUND invests under normal circumstances at least 65%
            of its assets in a diversified portfolio of fixed income securi-
            ties of varying maturities. The average portfolio duration of this
            Fund will normally vary within a three- to six-year time frame
            based on the Advisor's forecast for interest rates. The Fund may
            invest up to 10% of its assets in fixed income securities that are
            rated below investment grade but rated B or higher by Moody's or
            S&P (or, if unrated, determined by the Advisor to be of comparable
            quality). For information on the risks associated with investments
            in securities rated below investment grade, see "Appendix B--De-
            scription of Securities Ratings." The Fund may also invest up to
            20% of its assets in securities denominated in foreign currencies,
            and may invest beyond this limit in U.S. dollar-denominated secu-
            rities of foreign issuers. Portfolio holdings will be concentrated
            in areas of the bond market (based on quality, sector, coupon or
            maturity) which the Advisor believes to be relatively undervalued.
            The total rate of return for this Fund is expected to exhibit less
            volatility than that of the Long-Term U.S. Government Fund because
            its duration will normally be shorter.
 
            TOTAL RETURN FUND II has the same policies as the Total Return
            Fund, except that its investments in fixed income securities are
            limited to those of domestic (U.S.) issuers that are rated at
            least Baa by Moody's or BBB by S&P (or, if unrated, determined by
            the Advisor to be of comparable quality).
 
            TOTAL RETURN FUND III has the same policies as the Total Return
            Fund, except that it limits its investments with respect to cer-
            tain socially sensitive issues in the same manner as the Low Dura-
            tion Fund III.
                   
            PIMCO TOTAL RETURN MORTGAGE FUND has the same policies as the
            PIMCO Low Duration Mortgage Fund (described below), except that its
            average portfolio duration will normally vary within a two- to six-
            year time frame based on the Adviser's view of the potential for
            total return offered by a particular duration strategy.     
 
            COMMERCIAL MORTGAGE SECURITIES FUND invests at least 65% of its
            assets in commercial mortgage-backed securities rated at least Baa
            by Moody's or BBB by S&P (or, if unrated, determined by the Advi-
            sor to be of comparable quality). The Fund also may invest up to
            35% of its assets in lower-rated securities (but rated at least B,
            or, if unrated, determined by the Advisor to be of comparable
            quality) if such securities are considered by the Advisor to have
            attractive investment characteristics. For information on the
            risks associated with investments in securities rated below in-
            vestment grade, see "Appendix B--Description of Securities Rat-
            ings." The average portfolio duration of this Fund will normally
            vary within a three- to eight-year time frame depending on the Ad-
            visor's view of the potential for total return offered by a par-
            ticular duration strategy. The Fund may invest in securities of
            foreign issuers, but only those that are U.S. dollar-denominated.
 
       
<PAGE>
                 
            MODERATE DURATION FUND invests in a diversified portfolio of fixed
            income securities of varying maturities. The average portfolio du-
            ration of this Fund will normally vary within a two- to five-year
            time frame based on the Advisor's forecast for interest rates. For
            information on the risks associated with investments in securities
            rated below investment grade, see "Ap-pendix B--Description of
            Securities Ratings." The Fund may invest up to 20% of its assets in
            securities denominated in foreign cur-rencies, and may invest beyond
            this limit in U.S. dollar-denomi-nated securities of foreign
            issuers. The total rate of return for this Fund is expected to
            exhibit less volatility than that of the Total Return Fund because
            its duration will normally be shorter. However, the total rate of
            return for this Fund is expected to ex-hibit more volatility than
            that of the Low Duration Fund because its duration will normally be
            longer. 
               
            REAL RETURN BOND FUND invests under normal circumstances at least
            65% of its total assets in inflation-indexed bonds issued by U.S.
            and foreign governments, their agencies or instrumentalities. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Advisor to be of
            comparable quality). The Fund may invest up to 35% of its assets in
            other types of fixed income instruments, including securities de-
            nominated in foreign currencies, (and the Fund may also invest be-
            yond this limit in U.S. dollar-denominated securities of foreign
            issuers).      
               Inflation-indexed bonds are fixed income securities whose prin-
            cipal value is periodically adjusted according to the rate of in-
            flation. Such bonds generally are issued at an interest rate lower
            than non-inflation related bonds, but are expected to retain their
            value against inflation over time. For a more complete discussion
            of inflation-indexed bonds, including the risks associated with
            investing in such securities, see "Characteristics and Risks of
            Securities and Investment Techniques--Inflation-Indexed Bonds."
            See "Taxes" for information about the possible tax consequences of
            investing in the Fund and in inflation-indexed bonds.
               In managing fixed income securities, one of the principal tools
            generally used by the Advisor is "duration," which is a measure of
            the expected life of a fixed income security on a present value
            basis, incorporating a bond's yield, coupon interest payments, fi-
            nal maturity and call features. See "Appendix A--Description of
            Duration." Because of the unique features of inflation-indexed
            bonds, the Advisor utilizes a modified form of duration for the
            Real Return Bond Fund ("modified real duration") which measures
            price changes in such bonds as a result of changes in real, rather
            than nominal, interest rates. Although there is no limit on the
            modified real duration of the Real Return Bond Fund, it is ex-
            pected that the average modified real duration of the Fund will
            normally vary approximately with the range of the average modified
            real duration of all inflation-indexed bonds issued by the U.S.
            Treasury in the aggregate.
                 
            MUNICIPAL BOND FUND seeks high current income exempt from federal
            income tax, consistent with preservation of capital. Capital ap-
            preciation is a secondary objective. The Fund seeks its objectives
            by investing in debt securities whose interest is, in the opinion
            of bond counsel for the issuer at the time of issuance, exempt
            from federal income tax ("Municipal Bonds"). Municipal Bonds gen-
            erally are issued by states and local governments and their agen-
            cies, authorities and other instrumentalities. It is a policy of
            the Fund that, under normal market conditions, at least 80% of its
            net assets will be invested in Municipal Bonds. The Fund may in-
            vest up to 20% of its net assets in U.S. Government securities,
            money market instruments and/or "private activity" bonds. Under
            normal circumstances, the average portfolio duration of the Munic-
            ipal Bond Fund will vary within a three- to ten-year time frame,
            based on the Adviser's forecast for interest rates.
               The Fund may invest up to 10% of its net assets in Municipal
            Bonds or "private activity" bonds which are rated below Baa by
            Moody's or BBB by S&P but which are rated at least Ba by Moody's
            or BB by S&P (or, if unrated, determined by the Adviser to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings."      

            LOW DURATION FUND invests in a diversified portfolio of fixed in-
            come securities of varying maturities. The average portfolio dura-
            tion of this Fund will normally vary within a one- to three-year
            time frame based on the Advisor's forecast for interest rates. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Advisor to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings." The Fund may invest
            up to 20% of its assets in securities denominated in foreign cur-
            rencies, and may invest beyond this limit in U.S. dollar-denomi-
            nated securities of foreign issuers. The total rate of return for
            this Fund is expected to exhibit less volatility than that of the
            Moderate Duration Fund or the Total Return Fund because its dura-
            tion will be shorter.
 
         
<PAGE>
 
            LOW DURATION FUND II has the same policies as the Low Duration
            Fund, except that its investments in fixed income securities are
            limited to those of domestic (U.S.) issuers that are rated at
            least A by Moody's or S&P (or, if unrated, determined by the Advi-
            sor to be of comparable quality).
 
            LOW DURATION FUND III has the same policies as the Low Duration
            Fund, except that it limits its investments with respect to cer-
            tain socially sensitive issues. As a matter of non-fundamental
            policy, the Fund will not invest in the securities of any issuer
            determined by the Advisor to be engaged principally in the provi-
            sion of healthcare services, the manufacture of alcoholic bever-
            ages, tobacco products, pharmaceuticals or military equipment, or
            the operation of gambling casinos. The Fund will also avoid, to
            the extent possible on the basis of information available to the
            Advisor, the purchase of securities of issuers engaged in the pro-
            duction or trade of pornographic materials. An issuer will be
            deemed to be principally engaged in an activity if it derives more
            than 10% of its gross revenues from such activities.
                 
            PIMCO LOW DURATION MORTGAGE FUND invests under normal circum-
            stances at least 80% of its assets in a diversified portfolio of
            mortgage-related securities. The Fund will not acquire a security
            if, as a result, more than 10% of the Fund's total assets would be
            invested in securities rated below Aaa by Moody's or AAA by S&P,
            subject to a minimum rating of Baa by Moody's or BBB by S&P (or,
            if unrated, determined by the Advisor to be of comparable quali-
            ty). The average portfolio duration of this Fund will normally
            vary within a one- to three-year time frame based on the Advisor's
            view of the potential for total return offered by a particular du-
            ration strategy. The Fund may invest without limit in U.S. dollar-
            denominated securities of foreign issuers. The total rate of re-
            turn and share price for this Fund are expected to exhibit less
            volatility than that of the PIMCO Total Return Mortgage Fund be-
            cause its duration will be shorter.     
 
            SHORT-TERM FUND invests in a diversified portfolio of fixed income
            securities of varying maturities. The average portfolio duration
            of this Fund will normally not exceed one year. The Fund may in-
            vest up to 10% of its assets in fixed income securities that are
            rated below investment grade (rated below Baa by Moody's or BBB by
            S&P) but rated B or higher by Moody's or S&P (or, if unrated, de-
            termined by the Advisor to be of comparable quality). Securities
            rated below investment grade may be referred to colloquially as
            "junk bonds." For information on the risks associated with invest-
            ments in securities rated below investment grade, see "Appendix
            B--Description of Securities Ratings." The Fund may invest up to
            5% of its assets in securities denominated in foreign currencies,
            and may invest beyond this limit in U.S. dollar-denominated secu-
            rities of foreign issuers.
 
            MONEY MARKET FUND seeks maximum current income consistent with the
            preservation of capital and daily liquidity. It attempts to
            achieve this objective by investing at least 95% of its total as-
            sets, measured at the time of investment, in a diversified portfo-
            lio of the highest quality money market securities. The Fund may
            also invest up to 5% of its total assets, measured at the time of
            investment, in money market securities that are in the second-
            highest rating category for short-term obligations. The Fund's in-
            vestments in securities will be limited to U.S. dollar-denominated
            securities that mature in 397 days or less from the date of pur-
            chase. The Fund may invest in the following: obligations of the
            U.S. Government (including its agencies and instrumentalities);
            short-term corporate debt securities of domestic and foreign cor-
            porations; obligations of domestic and foreign commercial banks,
            savings banks, and savings and loan associations; and commercial
            paper. The Fund may invest more than 25% of its total assets in
            securities or obligations issued by U.S. banks. The dollar-
            weighted average portfolio maturity of the Fund will not exceed 90
            days.
               The Money Market Fund may invest only in U.S. dollar-denomi-
            nated money market instruments that present minimal credit risk
            and, with respect to at least 95% of its total assets, measured at
            the time of investment, that are of the highest quality. The Advi-
            sor will make a determination as to whether a security presents
            minimal credit risk under procedures adopted by the Board of
            Trustees. A money market instrument will be considered to be of
            the highest quality (1) if rated in the highest rating category
            (i) by any two nationally recognized statistical rating organiza-
            tions ("NRSROs") (e.g., Aaa or Prime-1 by Moody's, AAA or A-1 by
            S&P), or, (ii) if rated by only one NRSRO, by that NRSRO, and
            whose acquisition is approved or ratified by the Board of Trust-
            ees; (2) if unrated but issued by an issuer that has short-term
            debt obligations of comparable maturity, priority, and security,
            and that are rated in the highest rating category by (i) any two
            NRSROs or, (ii) if rated by only one NRSRO, by that NRSRO, and
            whose acquisition is approved or ratified by the Board of Trust-
            ees; or (3) an unrated security that is of comparable quality to a
            security rated in the highest rating category as determined by the
            Advisor and whose acquisition is approved or ratified by the Board
            of Trustees. With respect to no more than 5% of its total assets,
            measured at the time of investment, the Fund may also
 
         
<PAGE>
 
            invest in money market instruments that are in the second-highest
            rating category for short-term debt obligations (e.g., rated Aa or
            Prime-2 by Moody's or AA or A-2 by S&P). A money market instrument
            will be considered to be in the second-highest rating category un-
            der the criteria described above with respect to instruments con-
            sidered to be of the highest quality, as applied to instruments in
            the second-highest rating category. See "Appendix B--Description
            of Securities Ratings" for a description of Moody's and S&P's rat-
            ings applicable to fixed income securities.
               The Money Market Fund may not invest more than 5% of its total
            assets, measured at the time of investment, in securities of any
            one issuer that are of the highest quality, except that (1) the
            Fund may invest more than 5% of its total assets in the securities
            of a single issuer if rated in the highest rating category for a
            period of up to three business days after purchase, provided that
            the Fund may not make more than one investment at a time in accor-
            dance with this exception, and (2) this limitation shall not apply
            to U.S. Government securities and repurchase agreements with re-
            spect thereto. The Fund may not invest more than the greater of 1%
            of its total assets or $1,000,000, measured at the time of invest-
            ment, in securities of any one issuer that are in the second-high-
            est rating category, except that this limitation shall not apply
            to U.S. Government securities. In the event that an instrument ac-
            quired by the Fund is downgraded or otherwise ceases to be of the
            quality that is required for securities purchased by the Fund, the
            Advisor, under procedures approved by the Board of Trustees (or
            the Board of Trustees itself if the Advisor becomes aware an
            unrated security is downgraded below high quality and the Advisor
            does not dispose of the security or such security does not mature
            within five business days) shall promptly reassess whether such
            security presents minimal credit risk and determine whether to re-
            tain the instrument.
 
 
TOTAL       The "total return" sought by certain of the Funds will consist of
RETURN AND  interest and dividends from underlying securities, capital appre-
REAL RETURN ciation reflected in unrealized increases in value of portfolio
            securities (realized by the shareholder only upon selling shares),
            or realized from the purchase and sale of securities and use of
            futures and options, or gains from favorable changes in foreign
            currency exchange rates. Generally, over the long term, the total
            return obtained by a portfolio investing primarily in fixed income
            securities is not expected to be as great as that obtained by a
            portfolio that invests primarily in equity securities. At the same
            time, the market risk and price volatility of a fixed income port-
            folio is expected to be less than that of an equity portfolio, so
            that a fixed income portfolio is generally considered to be a more
            conservative investment. The change in market value of fixed in-
            come securities (and therefore their capital appreciation or de-
            preciation) is largely a function of changes in the current level
            of interest rates. Generally, when interest rates are falling, a
            portfolio with a shorter duration will not generate as high a
            level of total return as a portfolio with a longer duration. Con-
            versely, when interest rates are rising, a portfolio with a
            shorter duration will generally outperform longer duration portfo-
            lios. When interest rates are flat, shorter duration portfolios
            generally will not generate as high a level of total return as
            longer duration portfolios (assuming that long-term interest rates
            are higher than short-term rates, which is commonly the case).
            With respect to the composition of any fixed income portfolio, the
            longer the duration of the portfolio, the greater the anticipated
            potential for total return, with, however, greater attendant mar-
            ket risk and price volatility than for a portfolio with a shorter
            duration. The market value of fixed income securities denominated
            in currencies other than the U.S. dollar also may be affected by
            movements in foreign currency exchange rates.
               The change in market value of equity securities (and therefore
            their capital appreciation or depreciation) may depend upon a num-
            ber of factors, including: conditions in the securities markets,
            the business success of the security's issuer, changing interest
            rates, real or perceived economic and competitive industry condi-
            tions, and foreign currency exchange rates. Historically, the to-
            tal return performance of equity-oriented portfolios has generally
            been greater over the long term than fixed income portfolios. How-
            ever, the market risk and price volatility of an equity portfolio
            is generally greater than that of a fixed income portfolio, and is
            generally considered to be a more aggressive investment.

         
<PAGE>
 
               "Real Return," or "Inflation Adjusted Return," as referenced in
            the name and investment objective of the Real Return Bond Fund, is
            a measure of the change in purchasing power of money invested in a
            particular instrument after adjusting for inflation. An investment
            in a security generating a high nominal return (such as a typical
            U.S. Government Treasury bond) may not generate a high real return
            once inflation is considered. For example, an instrument generat-
            ing a 9% nominal return at a time when inflation is 6% has a real
            return of approximately 3%; that is, the purchasing power of the
            money invested in that instrument would only increase by approxi-
            mately 3%. On the other hand, an inflation-indexed instrument gen-
            erating a 5% real return would generate a 5% increase in purchas-
            ing power regardless of the rate of inflation. As stated above,
            the investment objective of the Fund is to seek to achieve maximum
            real return. The total return (not adjusted for inflation) at-
            tained by this Fund may be less than the total return attained by
            other of the PIMCO Funds that do not invest primarily in infla-
            tion-indexed securities.
               In the case of inflation-indexed bonds, changes in market value
            are tied to the relationship between nominal interest rates and
            the rate of inflation. If inflation were to rise at a faster rate
            than nominal interest rates, real interest rates might decline,
            leading to an increase in value of inflation-indexed bonds. In
            contrast, if nominal interest rates increase at a faster rate than
            inflation, real interest rates might increase, leading to a de-
            crease in value of inflation-indexed bonds.
 
            Investment Risks and Considerations
                 
            The following are some of the principal risks of investing in the
            Funds. Investors should read this Prospectus carefully for a more
            complete discussion of the risks relating to an investment in the
            Funds. The net asset value per share of any Fund may be less at
            the time of redemption than it was at the time of investment. Gen-
            erally, the value of fixed income securities can be expected to
            vary inversely with changes in prevailing interest rates, i.e., as
            interest rates rise, market value tends to decrease, and vice
            versa, although this may not be true in the case of inflation-
            indexed bonds. In addition, certain of the Funds may invest in se-
            curities rated lower than Baa by Moody's or BBB by S&P. Such secu-
            rities carry a high degree of credit risk and are considered spec-
            ulative by the major rating agencies.     
               Certain Funds may invest in securities of foreign issuers,
            which may be subject to additional risk factors, including foreign
            currency and political risks, not applicable to securities of U.S.
            issuers. Certain of the Funds' investment techniques may involve a
            form of borrowing, which may tend to exaggerate the effect on net
            asset value of any increase or decrease in the market value of a
            Fund's portfolio and may require liquidation of portfolio posi-
            tions when it is not advantageous to do so. Certain Funds may sell
            securities short, which exposes the Fund to a risk of loss if the
            value of the security sold short should increase.
               All Funds (except the Money Market Fund) may use derivative in-
            struments, consisting of futures, options, options on futures, and
            swap agreements, for hedging purposes or as part of their invest-
            ment strategies. Use of these instruments may involve certain
            costs and risks, including the risk that a Fund could not close
            out a position when it would be most advantageous to do so, the
            risk of an imperfect correlation between the value of the securi-
            ties being hedged and the value of the particular derivative in-
            strument, and the risk that unexpected changes in interest rates
            may adversely affect the value of a Fund's investments in particu-
            lar derivative instruments. Unless otherwise indicated, all limi-
            tations applicable to Fund investments (as stated in this Prospec-
            tus and in the Statement of Additional Information) apply only at
            the time a transaction is entered into. Any subsequent change in a
            rating assigned by any rating service to a security (or, if
            unrated, deemed to be of comparable quality), or change in the
            percentage of Fund assets invested in certain securities or other
            instruments, or change in the average duration of a Fund's invest-
            ment portfolio, resulting from market fluctuations
 
         
<PAGE>
 
            or other changes in a Fund's total assets, will not require a Fund
            to dispose of an investment until the Advisor determines that is
            practicable to sell or close out the investment without undue mar-
            ket or tax consequences to the Fund. In the event that ratings
            services assign different ratings to the same security, the Advi-
            sor will determine which rating it believes best reflects the
            security's quality and risk at that time, which may be the higher
            of the several assigned ratings.
               Investors should carefully consider the possible tax conse-
            quences from investing in the Real Return Bond Fund. The Fund in-
            vests primarily in securities that for tax purposes may be consid-
            ered to have been issued originally at a discount. Accordingly,
            the Fund may be required to make annual distributions to share-
            holders in excess of the cash received by the Fund in a given pe-
            riod from those investments. See "Characteristics and Risks of Se-
            curities and Investment Techniques--Inflation-Indexed Bonds" and
            "Taxes" for additional information.
                
               The Commercial Mortgage Securities, Real Return Bond, Foreign
            Bond, Global Bond, Global Bond II, International Bond, Emerging
            Markets Bond and Emerging Markets Bond II Funds are "non-diversi-
            fied" for purposes of the Investment Company Act of 1940 ("1940
            Act"), meaning that they may invest a greater percentage of their
            assets in the securities of one issuer than the other Funds. As
            "non-diversified" portfolios, these Funds may be more susceptible
            to risks associated with a single economic, political or regula-
            tory occurrence than a diversified portfolio might be.     
               The Funds offer their shares to both retail and institutional
            investors. Institutional shareholders, some of whom also may be
            investment advisory clients of Pacific Investment Management, may
            hold large positions in certain of the Funds. Such shareholders
            may on occasion make large redemptions of their holdings in the
            Funds to meet their liquidity needs, in connection with strategic
            adjustments to their overall portfolio of investments, or for
            other purposes. Large redemptions from some Funds could require
            the Advisor to liquidate portfolio positions when it is not most
            desirable to do so. Liquidation of portfolio holdings also may
            cause a Fund to realize taxable capital gains.
 
            Characteristics and Risks of Securities and Investment Techniques
 
            The following describes in greater detail different types of secu-
            rities and investment techniques used by the individual Funds, and
            discusses certain concepts relevant to the investment policies of
            the Funds. Additional information about the Funds' investments and
            investment practices may be found in the Statement of Additional
            Information.
 
 
U.S.        U.S. Government securities are obligations of, or guaranteed by,
GOVERNMENT  the U.S. Government, its agencies or instrumentalities. The U.S.
SECURITIES  Government does not guarantee the net asset value of the Funds'
            shares. Some U.S. Government securities, such as Treasury bills,
            notes and bonds, and securities guaranteed by the Government Na-
            tional Mortgage Association ("GNMA"), are supported by the full
            faith and credit of the United States; others, such as those of
            the Federal Home Loan Banks, are supported by the right of the is-
            suer to borrow from the U.S. Treasury; others, such as those of
            the Federal National Mortgage Association ("FNMA"), are supported
            by the discretionary authority of the U.S. Government to purchase
            the agency's obligations; and still others, such as those of the
            Student Loan Marketing Association, are supported only by the
            credit of the instrumentality. U.S. Government securities include
            securities that have no coupons, or have been stripped of their
            unmatured interest coupons, individual interest coupons from such
            securities that trade separately, and evidences of receipt of such
            securities. Such securities may pay no cash income, and are pur-
            chased at a deep discount from their value at maturity. Because
            interest on zero coupon securities is not distributed on a current
            basis but is, in effect, compounded, zero coupon securities tend
            to be subject to greater market risk than interest-paying securi-
            ties of similar maturities. Custodial receipts issued in connec-
            tion with so-called trademark zero coupon securities, such as CATs
            and TIGRs, are not issued by the U.S. Treasury, and are therefore
            not U.S. Government securities, although the underlying bond rep-
            resented by such receipt is a debt obligation of the U.S. Trea-
            sury. Other zero coupon Treasury securities (STRIPs and CUBEs) are
            direct obligations of the U.S. Government.

         
<PAGE>
 
CORPORATE   Corporate debt securities include corporate bonds, debentures,
DEBT        notes and other similar corporate debt instruments, including con-
SECURITIES  vertible securities. Debt securities may be acquired with warrants
            attached. Corporate income-producing securities may also include
            forms of preferred or preference stock. The rate of interest on a
            corporate debt security may be fixed, floating or variable, and
            may vary inversely with respect to a reference rate. See "Variable
            and Floating Rate Securities" below. The rate of return or return
            of principal on some debt obligations may be linked or indexed to
            the level of exchange rates between the U.S. dollar and a foreign
            currency or currencies.
               Investments in corporate debt securities that are rated below
            investment grade (rated below Baa (Moody's) or BBB (S&P)) are de-
            scribed as "speculative" both by Moody's and S&P. Such securities
            are sometimes referred to as "junk bonds," and may be subject to
            greater market fluctuations, less liquidity and greater risk of
            loss of income or principal, including a greater possibility of
            default or bankruptcy of the issuer of such securities, than are
            more highly rated debt securities. Moody's also describes securi-
            ties rated Baa as having speculative characteristics. The Advisor
            seeks to minimize these risks through diversification, in-depth
            credit analysis and attention to current developments in interest
            rates and market conditions. See "Appendix B--Description of Secu-
            rities Ratings." Investments in high yield securities are dis-
            cussed separately below under "High Yield Securities ("Junk
            Bonds")."
                               
CONVERTIBLE Each Fund (except the Municipal Bond Fund) may invest in 
SECURITIES  convertible securities, which may offer higher income than the
            common stocks into which they are convertible. Typically,
            convertible securities are callable by the company, which may, in
            effect, force conversion before the holder would otherwise choose.
                 
               The convertible securities in which the Funds may invest con-
            sist of bonds, notes, debentures and preferred stocks which may be
            converted or exchanged at a stated or determinable exchange ratio
            into underlying shares of common stock. A Fund may be required to
            permit the issuer of a convertible security to redeem the securi-
            ty, convert it into the underlying common stock, or sell it to a
            third party. Thus, a Fund may not be able to control whether the
            issuer of a convertible security chooses to convert that security.
            If the issuer chooses to do so, this action could have an adverse
            effect on a Fund's ability to achieve its investment objectives.    
                
               While the Fixed Income Funds intend to invest primarily in
            fixed income securities, each may invest in convertible securities
            or equity securities. While some countries or companies may be re-
            garded as favorable investments, pure fixed income opportunities
            may be unattractive or limited due to insufficient supply, legal
            or technical restrictions. In such cases, a Fund may consider eq-
            uity securities or convertible bonds to gain exposure to such in-
            vestments.     
                    
LOAN        Certain Funds may invest in fixed- and floating-rate loans arranged
PARTICIPA-  through private negotiations between an issuer of debt instruments
TIONS AND   and one or more financial institutions ("lenders"). Generally, the
ASSIGNMENTS Funds' investments in loans are expected to take the form of loan
            participations and assignments of portions of loans from third
            parties.           
                
               Large loans to corporations or governments may be shared or
            syndicated among several lenders, usually banks. The Funds may
            participate in such syndicates, or can buy part of a loan, becom-
            ing a direct lender. Participations and assignments involve spe-
            cial types of risk, including limited marketability and the risks
            of being a lender. See "Illiquid Securities" for a discussion of
            the limits on a Fund's investments in loan participations and as-
            signments with limited marketability. If a Fund purchases a par-
            ticipation, it may only be able to enforce its rights through the
            lender, and may assume the credit risk of the lender in addition
            to the borrower. In assignments, the Funds' rights against the
<PAGE>

            borrower may be more limited than those held by the original
            lender.     
    
DELAYED     The Funds (except the PIMCO Money Market and Municipal Bond Funds)
FUNDING     may also enter into, or acquire participations in, delayed funding
LOANS AND   loans and revolving credit facilities. Delayed funding loans and
REVOLVING   revolving credit facilities are borrowing arrangements in which
CREDIT      the lender agrees to make loans up to a maximum amount upon demand
FACILITIES  by the borrower during a specified term. A revolving credit facil-
            ity differs from a delayed funding loan in that as the borrower
            repays the loan, an amount equal to the repayment may be borrowed
            again during the term of the revolving credit facility. These com-
            mitments may have the effect of requiring a Fund to increase its
            investment in a company at a time when it might not otherwise de-
            cide to do so (including at a time when the company's financial
            condition makes it unlikely that such amounts will be repaid).
               The Funds may acquire a participation interest in delayed fund-
            ing loans or revolving credit facilities from a bank or other fi-
            nancial institution. See "Loan Participations and Assignments."
            The terms of the participation require the Fund to make a pro rata
            share of all loans extended to the borrower and entitles the Fund
            to a pro rata share of all payments made by the borrower. Delayed
            funding loans and revolving credit facilities usually provide for
            floating or variable rates of interest. To the extent that a Fund
            is committed to advance additional funds, it will at all times
            segregate assets, determined to be liquid by the Adviser in accor-
            dance with procedures established by the Board of Trustees, in an
            amount sufficient to meet such commitments.      

VARIABLE    Variable and floating rate securities provide for a periodic ad-
AND         justment in the interest rate paid on the obligations. The terms
FLOATING    of such obligations must provide that interest rates are adjusted
RATE        periodically based upon an interest rate adjustment index as pro-
SECURITIES  vided in the respective obligations. The adjustment intervals may
            be regular, and range from daily up to annually, or may be event
            based, such as based on a change in the prime rate. The Money Mar-
            ket Fund may invest in a variable rate security having a stated
            maturity in excess of 397 calendar days if the interest rate will
            be adjusted, and the Fund may demand payment of principal from the
            issuer, within the period.
                
               Each of the Fixed Income Funds may engage in credit spread
            trades and invest in floating rate debt instruments ("floaters").
            A credit spread trade is an investment position relating to a dif-
            ference in the prices or interest rates of two securities or cur-
            rencies, where the value of the investment position is determined
            by movements in the difference between the prices or interest
            rates, as the case may be, of the respective securities or curren-
            cies. The interest rate on a floater is a variable rate which is
            tied to another interest rate, such as a money-market index or
            Treasury bill rate. The interest rate on a floater resets periodi-
            cally, typically every six months. While, because of the interest
            rate reset feature, floaters provide a Fund with a certain degree
            of protection against rises in interest rates, a Fund will partic-
            ipate in any declines in interest rates as well.     
                
               Each of the Fixed Income Funds (except the Money Market Fund)
            may also invest in inverse floating rate debt instruments ("in-
            verse floaters"). The interest rate on an inverse floater resets
            in the opposite direction from the market rate of interest to
            which the inverse floater is indexed. An inverse floating rate se-
            curity may exhibit greater price volatility than a fixed rate ob-
            ligation of similar credit quality. The Funds have adopted a pol-
            icy under which no Fund will invest more than 5% (10% in the case
            of the Total Return Mortgage Fund and the Low Duration Mortgage
            Fund) of its net assets in any combination of inverse floater, in-
            terest only ("IO"), or principal only ("PO") securities. See
            "Mortgage-Related and Other Asset-Backed Securities" for a discus-
            sion of IOs and POs.     
 
INFLATION-  Inflation-indexed bonds are fixed income securities whose princi-
INDEXED     pal value is periodically adjusted according to the rate of infla-
BONDS       tion. Such bonds generally are issued at an interest rate lower
            than typical bonds, but are expected to retain their principal
            value over time. The interest rate on these bonds is fixed at is-
            suance, but over the life of the bond this interest may be paid on
            an increasing principal value, which has been adjusted for infla-
            tion.
               Inflation-indexed securities issued by the U.S. Treasury will
            initially have maturities of ten years, although it is anticipated
            that securities with other maturities will be issued in the fu-
            ture. The securities will pay interest on a semi-annual basis,
            equal to a fixed percentage of the inflation-adjusted principal
            amount. For example, if an investor purchased an inflation-indexed
            bond with a par value of $1,000 and a 3% real rate of return cou-
            pon (payable 1.5% semi-annually), and inflation over the first six
            months were 1%, the mid-year par value of the bond would be $1,010
            and the first semi-annual interest payment would be $15.15 ($1,010
            times 1.5%). If inflation during the second half of the year
            reached 3%, the end-of-year par value of the bond would be $1,030
            and the second semi-annual interest payment would be $15.45
            ($1,030 times 1.5%).
 
         
<PAGE>
 
               If the periodic adjustment rate measuring inflation falls, the
            principal value of inflation-indexed bonds will be adjusted down-
            ward, and consequently the interest payable on these securities
            (calculated with respect to a smaller principal amount) will be
            reduced. Repayment of the original bond principal upon maturity
            (as adjusted for inflation) is guaranteed in the case of U.S.
            Treasury inflation-indexed bonds, even during a period of defla-
            tion. However, the current market value of the bonds is not guar-
            anteed, and will fluctuate. The Funds may also invest in other in-
            flation related bonds which may or may not provide a similar guar-
            antee. If such a guarantee of principal is not provided, the ad-
            justed principal value of the bond repaid at maturity may be less
            than the original principal.
               The value of inflation-indexed bonds is expected to change in
            response to changes in real interest rates. Real interest rates in
            turn are tied to the relationship between nominal interest rates
            and the rate of inflation. Therefore, if inflation were to rise at
            a faster rate than nominal interest rates, real interest rates
            might decline, leading to an increase in value of inflation-in-
            dexed bonds. In contrast, if nominal interest rates increased at a
            faster rate than inflation, real interest rates might rise, lead-
            ing to a decrease in value of inflation-indexed bonds.
               While these securities are expected to be protected from long-
            term inflationary trends, short-term increases in inflation may
            lead to a decline in value. If interest rates rise due to reasons
            other than inflation (for example, due to changes in currency ex-
            change rates), investors in these securities may not be protected
            to the extent that the increase is not reflected in the bond's in-
            flation measure.
                
               The U.S. Treasury has only recently begun issuing inflation-in-
            dexed bonds. As such, there is no trading history of these securi-
            ties, and there can be no assurance that a liquid market in these
            instruments will develop, although one is expected. Lack of a liq-
            uid market may impose the risk of higher transaction costs and the
            possibility that a Fund may be forced to liquidate positions when
            it would not be advantageous to do so. There also can be no assur-
            ance that the U.S. Treasury will issue any particular amount of
            inflation-indexed bonds. Certain foreign governments, such as the
            United Kingdom, Canada and Australia, have a longer history of is-
            suing inflation-indexed bonds, and there may be a more liquid mar-
            ket in certain of these countries for these securities.     
               The periodic adjustment of U.S. inflation-indexed bonds is tied
            to the Consumer Price Index for Urban Consumers ("CPI-U"), which
            is calculated monthly by the U.S. Bureau of Labor Statistics. The
            CPI-U is a measurement of changes in the cost of living, made up
            of components such as housing, food, transportation and energy.
            Inflation-indexed bonds issued by a foreign government are gener-
            ally adjusted to reflect a comparable inflation index, calculated
            by that government. There can be no assurance that the CPI-U or
            any foreign inflation index will accurately measure the real rate
            of inflation in the prices of goods and services. Moreover, there
            can be no assurance that the rate of inflation in a foreign coun-
            try will be correlated to the rate of inflation in the United
            States.
               Any increase in the principal amount of an inflation-indexed
            bond will be considered taxable ordinary income, even though in-
            vestors do not receive their principal until maturity. See "Taxes"
            for information about the possible tax consequences of investing
            in the Real Return Bond Fund and in inflation-indexed bonds.
               
MORTGAGE-   Each of the Funds (except the Money Market and Municipal Bond Funds)
RELATED AND may invest all of its assets in mortgage- or other asset-backed 
OTHER       securities. The value of some mortgage- or asset-backed securities 
ASSET-      in which the Funds invest may be particularly sensitive to changes 
BACKED      in prevailing interest rates, and, like the other investments of the
SECURITIES  Funds, the ability of a Fund to successfully utilize these
            instruments may depend in part upon the ability of the Advisor to
            forecast in-terest rates and other economic factors correctly.    
 
            MORTGAGE-PASS-THROUGH SECURITIES are securities representing in-
            terests in "pools" of mortgage loans secured by residential or
            commercial real property in which payments of both interest and
            principal on the securities are generally made monthly, in effect
            "passing through" monthly payments made by the individual borrow-
            ers on the mortgage loans which underlie the securities (net of
            fees paid to the issuer or guarantor of the securities). Early re-
            payment of principal on some mortgage-related securities (arising
            from prepayments of principal due to sale of the underlying prop-
            erty,

                                                            
<PAGE>
 
            refinancing, or foreclosure, net of fees and costs which may be
            incurred) may expose a Fund to a lower rate of return upon rein-
            vestment of principal. Also, if a security subject to prepayment
            has been purchased at a premium, the value of the premium would be
            lost in the event of prepayment. Like other fixed income securi-
            ties, when interest rates rise, the value of a mortgage-related
            security generally will decline; however, when interest rates are
            declining, the value of mortgage-related securities with prepay-
            ment features may not increase as much as other fixed income secu-
            rities. The rate of prepayments on underlying mortgages will af-
            fect the price and volatility of a mortgage-related security, and
            may have the effect of shortening or extending the effective matu-
            rity of the security beyond what was anticipated at the time of
            purchase. To the extent that unanticipated rates of prepayment on
            underlying mortgages increase the effective maturity of a mort-
            gage-related security, the volatility of such security can be ex-
            pected to increase.
               Payment of principal and interest on some mortgage pass-through
            securities (but not the market value of the securities themselves)
            may be guaranteed by the full faith and credit of the U.S. Govern-
            ment (in the case of securities guaranteed by GNMA); or guaranteed
            by agencies or instrumentalities of the U.S. Government (in the
            case of securities guaranteed by FNMA or the Federal Home Loan
            Mortgage Corporation ("FHLMC"), which are supported only by the
            discretionary authority of the U.S. Government to purchase the
            agency's obligations). Mortgage-related securities created by non-
            governmental issuers (such as commercial banks, savings and loan
            institutions, private mortgage insurance companies, mortgage bank-
            ers and other secondary market issuers) may be supported by vari-
            ous forms of insurance or guarantees, including individual loan,
            title, pool and hazard insurance and letters of credit, which may
            be issued by governmental entities, private insurers or the mort-
            gage poolers.
                 
            COLLATERALIZED MORTGAGE OBLIGATIONS ("CMOs") are hybrid mortgage-
            related instruments. Interest and pre-paid principal on a CMO are
            paid, in most cases, on a monthly basis. CMOs may be collateral-
            ized by whole mortgage loans but are more typically collateralized
            by portfolios of mortgage pass-through securities guaranteed by
            GNMA, FHLMC, or FNMA. CMOs are structured into multiple classes,
            with each class bearing a different stated maturity. Monthly pay-
            ments of principal, including prepayments, are first returned to
            investors holding the shortest maturity class; investors holding
            the longer maturity classes receive principal only after the first
            class has been retired. CMOs that are issued or guaranteed by the
            U.S. Government or by any of its agencies or instrumentalities
            will be considered U.S. Government securities by the Funds, while
            other CMOs, even if collateralized by U.S. Government securities,
            will have the same status as other privately issued securities for
            purposes of applying a Fund's diversification tests.     
 
            COMMERCIAL MORTGAGE-BACKED SECURITIES include securities that re-
            flect an interest in, and are secured by, mortgage loans on com-
            mercial real property. The market for commercial mortgage-backed
            securities developed more recently and in terms of total outstand-
            ing principal amount of issues is relatively small compared to the
            market for residential single-family mortgage-backed securities.
            Many of the risks of investing in commercial mortgage-backed secu-
            rities reflect the risks of investing in the real estate securing
            the underlying mortgage loans. These risks reflect the effects of
            local and other economic conditions on real estate markets, the
            ability of tenants to make loan payments, and the ability of a
            property to attract and retain tenants. Commercial mortgage-backed
            securities may be less liquid and exhibit greater price volatility
            than other types of mortgage-related or asset-backed securities.
                
            MORTGAGE-RELATED SECURITIES include securities other than those
            described above that directly or indirectly represent a participa-
            tion in, or are secured by and payable from, mortgage loans on
            real property, such as mortgage dollar rolls (see "Reverse Repur-
            chase Agreements, Dollar Rolls, and Borrowings"), CMO residuals or
            stripped mortgage-backed securities ("SMBS"), and may be struc-
            tured in classes with rights to receive varying proportions of
            principal and interest.     
 
       
<PAGE>
 
                 
               A common type of SMBS will have one class receiving some of the
            interest and most of the principal from the mortgage assets, while
            the other class will receive most of the interest and the remain-
            der of the principal. In the most extreme case, one class will re-
            ceive all of the interest (the interest-only, or "IO" class),
            while the other class will receive all of the principal (the prin-
            cipal-only, or "PO" class). The yield to maturity on an IO class
            is extremely sensitive to the rate of principal payments (includ-
            ing prepayments) on the related underlying mortgage assets, and a
            rapid rate of principal payments may have a material adverse ef-
            fect on a Fund's yield to maturity from these securities. The
            Funds have adopted a policy under which no Fund will invest more
            than 5% (10% in the case of the Total Return Mortgage Fund and Low
            Duration Mortgage Fund) of its net assets in any combination of
            IO, PO, or inverse floater securities. The Funds may invest in
            other asset-backed securities that have been offered to investors.
            For a discussion of the characteristics of some of these instru-
            ments, see the Statement of Additional Information.     
    
MUNICIPAL   The Municipal Bond Fund invests in Municipal Bonds which are gen-
BONDS       erally issued by states and local governments and their agencies,
            authorities and other instrumentalities. The Municipal Bonds which
            the Municipal Bond Fund may purchase include general obligation
            bonds and limited obligation bonds (or revenue bonds), including
            industrial development bonds issued pursuant to former federal tax
            law. General obligation bonds are obligations involving the credit
            of an issuer possessing taxing power and are payable from such is-
            suer's general revenues and not from any particular source. Lim-
            ited obligation bonds are payable only from the revenues derived
            from a particular facility or class of facilities or, in some
            cases, from the proceeds of a special excise or other specific
            revenue source. Tax-exempt "private activity" bonds and industrial
            development bonds generally are also revenue bonds and thus are
            not payable from the issuer's general revenues. The Municipal Bond
            Fund may invest in Municipal Bonds with credit enhancements such
            as letters of credit, municipal bond insurance and Standby Bond
            Purchase Agreements. The Municipal Bond Fund may also invest in
            municipal lease obligations, as well as securities derived from
            Municipal Bonds, such as residual interest bonds and participation
            interests.     
               
               Municipal Bonds are subject to credit and market risk. Credit
            risk relates to the ability of the issuer to make payments of
            principal and interest. The ability of an issuer to make such pay-
            ments could be affected by litigation, legislation or other polit-
            ical events or the bankruptcy of the issuer. Market risk relates
            to changes in a security's value as a result of changes in inter-
            est rates. Lower rated Municipal Bonds generally provide higher
            yields but are subject to greater credit and market risk than
            higher quality Municipal Bonds.     
 
REPURCHASE  For the purpose of achieving income, each of the Funds may enter
AGREEMENTS  into repurchase agreements, which entail the purchase of a portfo-
            lio-eligible security from a bank or broker-dealer that agrees to
            repurchase the security at the Fund's cost plus interest within a
            specified time (normally one day). If the party agreeing to repur-
            chase should default, as a result of bankruptcy or otherwise, the
            Fund will seek to sell the securities which it holds, which action
            could involve procedural costs or delays in addition to a loss on
            the securities if their value should fall below their repurchase
            price. No Fund will invest more than 15% of its net assets (10% in
            the case of the Money Market Fund) (taken at current market value)
            in repurchase agreements maturing in more than seven days.
          
REVERSE     A reverse repurchase agreement involves the sale of a security by
REPURCHASE  a Fund and its agreement to repurchase the instrument at a speci-
AGREEMENTS, fied time and price. Under a reverse repurchase agreement, the
DOLLAR      Fund continues to receive any principal and interest payments on
ROLLS, AND  the underlying security during the term of the agreement. The Fund
OTHER       generally will segregate assets determined to be liquid by the
BORROWINGS  Advisor in accordance with procedures established by the Board of
            Trustees to cover its obligations under reverse repurchase
            agreements and, to this extent, a reverse repurchase agreement (or
            economically similar transaction) will not be considered a "senior
            security" subject to the 300% asset coverage requirements otherwise
            applicable to borrowings by a Fund.      
                  
                A Fund may enter into dollar rolls, in which the Fund sells
            mortgage-backed or other securities for delivery in the current
            month and simultaneously contracts to purchase substantially simi-
            lar securities on a specified future date. In the case of dollar
            rolls involving mortgage-backed securities, the mortgage-backed
            securities that are purchased will be of the same type and will
            have the same interest rate as those sold, but will be supported
            by different pools of mortgages. The Fund forgoes principal and
            interest paid during the roll period on the securities sold in a
            dollar roll, but the Fund is compensated by the difference between
            the current sales price and the lower price for the future pur-
            chase as well as by any interest earned on the proceeds of the se-
            curities sold. The Fund also could be compensated through the re-
            ceipt of fee income equivalent to a lower forward price. The Fund
            will segregate assets determined to be liquid by the Advisor in
            accordance with procedures established by the Board of Trustees, to
            cover its obligations under dollar rolls.      
                                
               To the extent that positions in reverse repurchase agreements,
            dollar rolls or similar transactions are not covered through the
            maintenance of segregated liquid assets at lease equal to the amount
            of any forward purchase commitment, such transactions would be
            subject to the Funds' limitations on borrowings, which will restrict
            the aggregate of such transactions (plus any other borrowings) to 33
            1/3% (for each Fund except the Global Bond Fund II) of such Fund's
            total assets. Apart from such transactions, a Fund will not borrow
            money, except for temporary administrative purposes. The Global Bond
            Fund II may not borrow in excess of 10% of the value of its total
            assets and then only from banks as a temporary measure to facilitate
            the meeting of redemption requests (not for leverage) or for
            extraordinary or emergency purposes.      

LOANS OF    For the purpose of achieving income, each Fund may lend its port-  
PORTFOLIO   folio securities to brokers, dealers, and other financial institu- 
SECURITIES  tions, provided: (i) the loan is secured continuously by collat-   
            eral consisting of U.S. Government securities, cash or cash equiv- 
            alents (negotiable certificates of deposit, bankers' acceptances   
            or letters of credit) maintained on a daily                         
            
 
 
                                                              
<PAGE>
 
            mark-to-market basis in an amount at least equal to the current
            market value of the securities loaned; (ii) the Fund may at any
            time call the loan and obtain the return of the securities loaned;
            (iii) the Fund will receive any interest or dividends paid on the
            loaned securities; and (iv) the aggregate market value of securi-
            ties loaned will not at any time exceed 33 1/3% (25% in the case
            of the Global Bond Fund II) of the total assets of the Fund. Each
            Fund's performance will continue to reflect changes in the value
            of the securities loaned and will also reflect the receipt of ei-
            ther interest, through investment of cash collateral by the Fund
            in permissible investments, or a fee, if the collateral is U.S.
            Government securities. Securities lending involves the risk of
            loss of rights in the collateral or delay in recovery of the col-
            lateral should the borrower fail to return the security loaned or
            become insolvent. The Funds may pay lending fees to the party ar-
            ranging the loan.
 
     
DELAYED     Each of the Funds may purchase or sell securities on a when-is-
DELIVERY,   sued, delayed delivery, or forward commitment basis. These trans-
WHEN-       actions involve a commitment by the Fund to purchase or sell secu-
ISSUED, AND rities for a predetermined price or yield, with payment and deliv-
FORWARD     ery taking place more than seven days in the future, or after a
COMMITMENT  period longer than the customary settlement period for that type
TRANS-      of security. When such purchases are outstanding, the Fund will
ACTIONS     until the settlement date segregate assets determined to be liquid
            by the Advisor in accordance with procedures established by the
            Board of Trustees, in an amount sufficient to meet the purchase
            price. Typically, no income accrues on securities a Fund has
            committed to purchase prior to the time delivery of the securities
            is made, although a Fund may earn income on securities it has
            segregated. When purchasing a security on a when-issued, delayed
            deliv-ery, or forward commitment basis, the Fund assumes the rights
            and risks of ownership of the security, including the risk of price
            and yield fluctuations, and takes such fluctuations into account
            when determining its net asset value. Because the Fund is not re-
            quired to pay for the security until the delivery date, these risks
            are in addition to the risks associated with the Fund's other
            investments. If the Fund remains substantially fully invested at a
            time when when-issued, delayed delivery, or forward commitment
            purchases are outstanding, the purchases may result in a form of
            leverage. When the Fund has sold a security on a when-issued,
            delayed delivery, or forward commitment basis, the Fund does not
            participate in future gains or losses with respect to the security.
            If the other party to a transaction fails to deliver or pay for the
            securities, the Fund could miss a favorable price or yield
            opportunity or could suffer a loss. A Fund may dispose of or
            renegotiate a transaction after it is entered into, and may sell
            when-issued, delayed delivery or forward commitment securities
            before they are delivered, which may result in a capital gain or
            loss. There is no percentage limitation on the extent to which the
            Funds may purchase or sell securities on a when-issued, delayed
            delivery, or forward commitment basis.     
     
SHORT SALES Each of the Funds (except the StocksPLUS, High Yield and Total Re-
            turn III Funds), and particularly the StocksPLUS Short Strategy
            Fund, may from time to time effect short sales as part of their
            overall portfolio management strategies, including the use of de-
            rivative instruments, or to offset potential declines in value of
            long positions in similar securities as those sold short. A short
            sale (other than a short sale against the box) is a transaction in
            which a Fund sells a security it does not own at the time of the
            sale in anticipation that the market price of that security will
            decline. To the extent that a Fund engages in short sales, it must
            (except in the case of short sales "against the box") maintain
            segregated asset coverage in the form of assets determined to be
            liquid by the Advisor in accordance with procedures established by
            the Board of Trustees, or otherwise cover its position in a
            permissible manner. A short sale is "against the box" to the extent
            that the Fund contemporaneously owns, or has the right to obtain at
            no added cost, securities identical to those sold short. The Global
            Bond Fund II may only engage in short sales that are "against the
            box."      
 

          
<PAGE>
 
                     
FOREIGN     Each of the Funds (except the PIMCO Low Duration II, Municipal Bond,
SECURITIES  Long-Term U.S. Government and Total Return II Funds) may invest
            directly in fixed income securities of non-U.S. issuers. The PIMCO
            Money Market, High Yield, Commercial Mortgage Securities, Low
            Duration Mortgage, Total Return Mortgage and Long-Term U.S.
            Government Funds may only invest in U.S. dollar-denominated fixed
            income securities of non-U.S. issuers. Each of the Equity Funds may
            invest directly in foreign equity securities.     
                
               Except for the PIMCO Emerging Markets Bond Fund and the PIMCO
            Emerging Markets Bond Fund II, each of the Funds will concentrate
            its foreign investments in securities of issuers based in devel-
            oped countries. However, the PIMCO Short-Term, Low Duration and
            Low Duration III Funds may each invest up to 5% of its assets in
            securities of issuers based in the emerging market countries in
            which the PIMCO Emerging Markets Bond Fund and PIMCO Emerging Mar-
            kets Bond Fund II may invest, and each of the remaining Fixed In-
            come Funds that may invest in foreign securities may invest up to
            10% of its assets in such securities.     
                
               Individual foreign economies may differ favorably or unfavor-
            ably from the U.S. economy in such respects as growth of gross do-
            mestic product, rate of inflation, capital reinvestment, re-
            sources, self-sufficiency and balance of payments position. The
            securities markets, values of securities, yields and risks associ-
            ated with securities markets in different countries may change in-
            dependently of each other. Investing in the securities of issuers
            in any foreign country involves special risks and considerations
            not typically associated with investing in U.S. companies. Share-
            holders should consider carefully the substantial risks involved
            in investing in securities issued by companies and governments of
            foreign nations. These risks include: differences in accounting,
            auditing and financial reporting standards; generally higher com-
            mission rates on foreign portfolio transactions; the possibility
            of nationalization, expropriation or confiscatory taxation; ad-
            verse changes in investment or exchange control regulations (which
            may include suspension of the ability to transfer currency from a
            country); and political instability which could affect U.S. in-
            vestments in foreign countries. Additionally, foreign securities
            and dividends and interest payable on those securities may be sub-
            ject to foreign taxes, including taxes withheld from payments on
            those securities. Foreign securities often trade with less fre-
            quency and volume than domestic securities and therefore may ex-
            hibit greater price volatility. Additional costs associated with
            an investment in foreign securities may include higher custodial
            fees than apply to domestic custodial arrangements and transaction
            costs of foreign currency conversions. Changes in foreign exchange
            rates also will affect the value of securities denominated or
            quoted in currencies other than the U.S. dollar.     
                
               Certain of the Funds, and particularly the PIMCO Emerging Mar-
            kets Bond Fund and PIMCO Emerging Markets Bond Fund II, may invest
            in the securities of issuers based in countries with developing
            economies. Investing in developing (or "emerging market") coun-
            tries involves certain risks not typically associated with invest-
            ing in U.S. securities, and imposes risks greater than, or in ad-
            dition to, risks of investing in foreign, developed countries. A
            number of emerging market countries restrict, to varying degrees,
            foreign investment in securities. Repatriation of investment in-
            come, capital, and the proceeds of sales by foreign investors may
            require governmental registration and/or approval in some emerging
            market countries. A number of the currencies of emerging market
            countries have experienced significant declines against the U.S.
            dollar in recent years, and devaluation may occur subsequent to
            investments in these currencies by a Fund. Inflation and rapid
            fluctuations in inflation rates have had, and may continue to
            have, negative effects on the economies and securities markets of
            certain emerging market countries. Many of the emerging securities
            markets are relatively small, have low trading volumes, suffer pe-
            riods of relative illiquidity, and are characterized by signifi-
            cant price volatility. There is a risk in emerging market coun-
            tries that a future economic or political crisis could lead to
            price controls, forced mergers of companies, expropriation or con-
            fiscatory taxation, seizure, nationalization, or creation of gov-
            ernment monopolies, any of which may have a detrimental effect on
            a Fund's investment.     
                
               Additional risks of investing in emerging market countries may
            include: currency exchange rate fluctuations; greater social, eco-
            nomic and political uncertainty and instability (including the
            risk of war); more substantial govern-     

                                                              
<PAGE>
 
                 
            mental involvement in the economy; less governmental supervision
            and regulation of the securities markets and participants in those
            markets; unavailability of currency hedging techniques in certain
            emerging market countries; the fact that companies in emerging
            market countries may be newly organized and may be smaller and
            less seasoned companies; the difference in, or lack of, auditing
            and financial reporting standards, which may result in unavaila-
            bility of material information about issuers; the risk that it may
            be more difficult to obtain and/or enforce a judgment in a court
            outside the United States; and significantly smaller market capi-
            talization of securities markets. Also, any change in the leader-
            ship or policies of Eastern European countries, or the countries
            that exercise a significant influence over those countries, may
            halt the expansion of or reverse the liberalization of foreign in-
            vestment policies now occurring and adversely affect existing in-
            vestment opportunities.     
                
               Emerging securities markets may have different clearance and
            settlement procedures, which may be unable to keep pace with the
            volume of securities transactions or otherwise make it difficult
            to engage in such transactions. Settlement problems may cause a
            Fund to miss attractive investment opportunities, hold a portion
            of its assets in cash pending investment, or delay in disposing of
            a portfolio security. Such a delay could result in possible lia-
            bility to a purchaser of the security.     
                

               
                Each of the Fixed Income Funds (except the PIMCO Low Duration 
            II, Municipal Bond, Long-Term U.S. Government and Total Return II
            Funds) may invest in Brady Bonds. Brady Bonds are securities created
            through the exchange of existing commercial bank loans to sovereign
            entities for new obligations in connection with debt restructurings
            under a debt restructuring plan introduced by former U.S. Secretary
            of the Treasury, Nicholas F. Brady. Brady Bonds have been issued
            only recently, and for that reason do not have a long payment
            history. Brady Bonds may be collateralized or uncollateralized, are
            issued in various currencies (but primarily the U.S. dollar), and
            are actively traded in the over-the-counter secondary market. Brady
            Bonds are not considered to be U.S. Government securities. In light
            of the residual risk of Brady Bonds and, among other factors, the
            history of defaults with respect to commercial bank loans by public
            and private entities in countries issuing Brady Bonds, investments
            in Brady Bonds may be viewed as speculative. There can be no assur-
            ance that Brady Bonds acquired by a Fund will not be subject to
            restructuring arrangements or to requests for new credit, which may
            cause the Fund to suffer a loss of interest or principal on any of
            its holdings. For further information, see the Statement of
            Additional Information.     

               Certain of the Funds also may invest in sovereign debt (other
            than Brady Bonds) issued by governments, their agencies or instru-
            mentalities, or other government-related entities located in
            emerging market countries. Holders of sovereign debt may be re-
            quested to particpate in the rescheduling of such debt and to ex-
            tend further loans to governmental entities. In addition, there is
            no bankruptcy proceeding by which defaulted sovereign debt may be
            collected.     
                
               A Fund's investments in foreign currency denominated debt obli-
            gations and hedging activities will likely produce a difference
            between its book income and its taxable income. This difference
            may cause a portion of the Fund's income distributions to consti-
            tute returns of capital for tax purposes or require the Fund to
            make distributions exceeding book income to qualify as a regulated
            investment company for federal tax purposes.     
 
         
 
<PAGE>
 
FOREIGN     Foreign currency exchange rates may fluctuate significantly over
CURRENCY    short periods of time. They generally are determined by the forces
TRANS-      of supply and demand in the foreign exchange markets and the rela-
ACTIONS     tive merits of investments in different countries, actual or per-
            ceived changes in interest rates and other complex factors, as
            seen from an international perspective. Currency exchange rates
            also can be affected unpredictably by intervention (or the failure
            to intervene) by U.S. or foreign governments or central banks, by
            currency controls or political developments in the U.S. or abroad.
            Currencies in which the Funds' assets are denominated may be de-
            valued against the U.S. dollar, resulting in a loss to the Funds.
                
               All Funds that may invest in securities denominated in foreign
            currencies may buy and sell foreign currencies on a spot and for-
            ward basis to reduce the risks of adverse changes in foreign ex-
            change rates. A forward foreign currency exchange contract in-
            volves an obligation to purchase or sell a specific currency at a
            future date, which may be any fixed number of days from the date
            of the contract agreed upon by the parties, at a price set at the
            time of the contract. By entering into a forward foreign currency
            exchange contract, the Fund "locks in" the exchange rate between
            the currency it will deliver and the currency it will receive for
            the duration of the contract. As a result, a Fund reduces its ex-
            posure to changes in the value of the currency it will deliver and
            increases its exposure to changes in the value of the currency it
            will exchange into. The effect on the value of a Fund is similar
            to selling securities denominated in one currency and purchasing
            securities denominated in another. Contracts to sell foreign cur-
            rency would limit any potential gain which might be realized by a
            Fund if the value of the hedged currency increases. A Fund may en-
            ter into these contracts for the purpose of hedging against for-
            eign exchange risk arising from the Fund's investment or antici-
            pated investment in securities denominated in foreign currencies.
            A Fund also may enter into these contracts for purposes of in-
            creasing exposure to a foreign currency or to shift exposure to
            foreign currency fluctuations from one country to another. A Fund
            may use one currency (or a basket of currencies) to hedge against
            adverse changes in the value of another currency (or a basket of
            currencies) when exchange rates between the two currencies are
            positively correlated. Each Fund will segregate assets determined
            to be liquid by the Advisor in accordance with procedures estab-
            lished by the Board of Trustees, to cover its obligations under
            forward foreign currency exchange contracts entered into for non-
            hedging purposes.      
                
               All Funds that may invest in securities denominated in foreign
            currencies may invest in options on foreign currencies and foreign
            currency futures and options thereon. The Funds also may invest in
            foreign currency exchange-related securities, such as foreign cur-
            rency warrants and other instruments whose return is linked to
            foreign currency exchange rates. Each Fund that may invest in se-
            curities denominated in foreign currencies, except the Global
            Bond, Emerging Markets Bond, and Emerging Markets Bond II Funds,
            will use these techniques to hedge at least 75% of its exposure to
            foreign currency. For a description of these instruments, see "De-
            rivative Instruments" below and the Statement of Additional Infor-
            mation.     
                        
         

<PAGE>
 
 
                     
HIGH YIELD  The High Yield Fund invests at least 65% of its assets, each of
SECURITIES  the Emerging Markets Bond Fund and Emerging Markets Bond Fund II
("JUNK      may invest up to 100% of its assets, and the Commercial Mortgage
BONDS")     Securities Fund may invest up to 35% of its assets, in fixed in-
            come securities rated lower than Baa by Moody's or lower than BBB
            by S&P but rated at least B by Moody's or S&P (or, if not rated,
            of comparable quality). In addition, each of the StocksPLUS,
            StocksPLUS Short Strategy, Strategic Balanced, Foreign Bond, Global
            Bond, Global Bond II, Total Return, Total Return III, Real Return
            Bond, Moderate Duration, Low Duration, Low Duration III and Short-
            Term Funds may invest up to 10% of its assets in such securities.
            The Municipal Bond Fund may invest up to 10% of its assets in
            securities rated lower than Baa by Moody's or BBB by S&P but rated
            at least Ba by Moody's or S&P. Securities rated lower than Baa by
            Moody's or lower than BBB by S&P are sometimes referred to as "high
            yield" or "junk" bonds. Securities rated Baa are considered by
            Moody's to have some speculative characteristics. Investors should
            consider the following risks associated with high yield securities
            before investing in these Funds.     
               Investing in high yield securities involves special risks in
            addition to the risks associated with investments in higher rated
            fixed income securities. High yield securities may be regarded as
            predominately speculative with respect to the issuer's continuing
            ability to meet principal and interest payments. Analysis of the
            creditworthiness of issuers of high yield securities may be more
            complex than for issuers of higher quality debt securities, and
            the ability of a Fund to achieve its investment objective may, to
            the extent of its investments in high yield securities, be more
            dependent upon such creditworthiness analysis than would be the
            case if the Fund were investing in higher quality securities.
               High yield securities may be more susceptible to real or per-
            ceived adverse economic and competitive industry conditions than
            higher grade securities. The prices of high yield securities have
            been found to be less sensitive to interest rate changes than more
            highly rated investments, but more sensitive to adverse economic
            downturns or individual corporate developments. A projection of an
            economic downturn or of a period of rising interest rates, for ex-
            ample, could cause a decline in high yield security prices because
            the advent of a recession could lessen the ability of a highly
            leveraged company to make principal and interest payments on its
            debt securities. If the issuer of high yield securities defaults,
            a Fund may incur additional expenses to seek recovery. In the case
            of high yield securities structured as zero coupon or payment-in-
            kind securities, the market prices of such securities are affected
            to a greater extent by interest rate changes, and therefore tend
            to be more volatile than securities which pay interest periodi-
            cally and in cash.
               The secondary markets on which high yield securities are traded
            may be less liquid than the market for higher grade securities.
            Less liquidity in the secondary trading markets could adversely
            affect and cause large fluctuations in the daily net asset value
            of a Fund's shares. Adverse publicity and investor perceptions,
            whether or not based on fundamental analysis, may decrease the
            values and liquidity of high yield securities, especially in a
            thinly traded market.
               The use of credit ratings as the sole method of evaluating high
            yield securities can involve certain risks. For example, credit
            ratings evaluate the safety of principal and interest payments,
            not the market value risk of high yield securities. Also, credit
            rating agencies may fail to change credit ratings in a timely
            fashion to reflect events since the security was last rated. The
            Advisor does not rely solely on credit ratings when selecting se-
            curities for the Funds, and develops its own independent analysis
            of issuer credit quality. If a credit rating agency changes the
            rating of a portfolio security held by a Fund, the Fund may retain
            the portfolio security if the Advisor deems it in the best inter-
            est of shareholders.
                
               During the year ended March 31, 1998, based upon the dollar-
            weighted average ratings of the Funds' portfolio holdings at the
            end of each month in the Funds' fiscal year, each operational Fund
            that may invest greater than 5% of its assets in securities rated
            below investment grade had the following percentages of its net
            assets invested in securities rated in the categories indicated as
            rated by Moody's (or, if unrated, determined by the Advisor to be
            of comparable quality). See "Appendix B--Description of Securities
            Ratings," for further information.           
  
 
          
<PAGE>
 
              FIXED INCOME SECURITIES RATINGS
 
 
<TABLE>         
<CAPTION>
                                              RATING
                           --------------------------------------------
                                                      BELOW
       FUND                PRIME 1 AAA  AA    A   PRIME 1 Baa  Ba    B
       ----                ------- ---  ---  ---  ------- ---  ---  ---
       <S>                 <C>     <C>  <C>  <C>  <C>     <C>  <C>  <C> 
       Short-Term               17% 35%   2%  15%      16%  9%   6%   0%    
       Low Duration              6  75    1    1        5   7    5    0     
       Low Duration III         40  54    0    4        0   2    0    0     
       Moderate Duration        23  45    2    8        6   9    7    0     
       Total Return             20  47    0   13        6   8    6    0     
       Total Return III         16  44    1   17        9   8    5    0     
       High Yield                5   2    0    0        2   6   43   42     
       Global Bond              34  44    4   10        1   3    4    0     
       Global Bond II           65  21    3    6        0   2    3    0     
       Foreign Bond             54  31    4    2        1   2    6    0     
       Emerging Markets Bond    16  14    0    0        0  18   47    5     
       Strategic Balanced       17  58    1    9        4   2    9    0     
       StocksPLUS               26  38    1   10       11   7    7    0      
</TABLE>      
 
               These figures are intended solely to provide disclosure about
            each Fund's asset composition during its most recent fiscal year.
            The asset composition after this time may or may not be approxi-
            mately the same as represented by such figures. In addition, the
            categories reflect ratings by Moody's, and ratings assigned by S&P
            may not be consistent with ratings assigned by Moody's or other
            credit ratings services, and the Advisor may not necessarily agree
            with a rating assigned by any credit rating agency.
 
                 
DERIVATIVE  To the extent permitted by the investment objectives and policies
INSTRUMENTS of the Funds, the Funds may (except the Money Market Fund) pur-
            chase and write call and put options on securities, securities in-
            dexes and foreign currencies, and enter into futures contracts and
            use options on futures contracts as further described below. The
            Funds (except the Money Market and Municipal Bond Funds) also may
            enter into swap agreements with respect to foreign currencies,
            interest rates, and securities indexes. The Funds may use these
            techniques to hedge against changes in interest rates, foreign
            currency exchange rates or securities prices or as part of their
            overall investment strategies. The Funds (except the Money Market
            and Municipal Bond Funds) may also purchase and sell options
            relating to foreign currencies for purposes of increasing exposure
            to a foreign currency or to shift exposure to foreign currency
            fluctuations from one country to another. Each Fund will segregate
            assets determined to be liquid by the Advisor in accordance with
            procedures established by the Board of Trustees (or, as permitted by
            applicable regulation, enter into certain offsetting positions) to
            cover its obligations under options, futures, and swaps to avoid
            leveraging of the Fund.     
                
               Derivative instruments are considered for this purpose to consist
            of securities or other instruments whose value is derived from or
            related to the value of some other instrument or asset, and not to
            include those securities whose payment of principal and/or interest
            depends upon cash flows from underlying assets, such as mortgage-
            related or asset-backed securities. Each Fund (except the Money
            Market and Municipal Bond Funds) may invest all of its assets in
            derivative instruments, subject only to the Fund's investment
            objective and policies. The value of some derivative instruments in
            which the Funds invest may be particularly sensitive to changes in
            prevailing interest rates, and, like the other investments of the
            Funds, the ability of a Fund to successfully utilize these
            instruments may depend in part upon the ability of the Advisor to
            forecast interest rates and other economic factors correctly. If the
            Advisor incorrectly forecasts such factors and has taken positions
            in derivative instruments contrary to prevailing market trends, the
            Funds could be exposed to the risk of loss.     
               The Funds might not employ any of the strategies described be-
            low, and no assurance can be given that any strategy used will
            succeed. If the Advisor incorrectly forecasts interest rates, mar-
            ket values or other economic factors in

         
<PAGE>
 
            utilizing a derivatives strategy for a Fund, the Fund might have
            been in a better position if it had not entered into the transac-
            tion at all. The use of these strategies involves certain special
            risks, including a possible imperfect correlation, or even no cor-
            relation, between price movements of derivative instruments and
            price movements of related investments. While some strategies in-
            volving derivative instruments can reduce the risk of loss, they
            can also reduce the opportunity for gain or even result in losses
            by offsetting favorable price movements in related investments, or
            due to the possible inability of a Fund to purchase or sell a
            portfolio security at a time that otherwise would be favorable for
            it to do so, or the possible need for a Fund to sell a portfolio
            security at a disadvantageous time, because the Fund is required
            to maintain asset coverage or offsetting positions in connection
            with transactions in derivative instruments, and the possible in-
            ability of a Fund to close out or to liquidate its derivatives po-
            sitions.
 
            OPTIONS ON SECURITIES, SECURITIES INDEXES, AND CURRENCIES A Fund
            may purchase put options on securities and indexes. One purpose of
            purchasing put options is to protect holdings in an underlying or
            related security against a substantial decline in market value. A
            Fund may also purchase call options on securities and indexes. One
            purpose of purchasing call options is to protect against substan-
            tial increases in prices of securities the Fund intends to pur-
            chase pending its ability to invest in such securities in an or-
            derly manner. An option on a security (or index) is a contract
            that gives the holder of the option, in return for a premium, the
            right to buy from (in the case of a call) or sell to (in the case
            of a put) the writer of the option the security underlying the op-
            tion (or the cash value of the index) at a specified exercise
            price at any time during the term of the option. The writer of an
            option on a security has the obligation upon exercise of the op-
            tion to deliver the underlying security upon payment of the exer-
            cise price or to pay the exercise price upon delivery of the un-
            derlying security. Upon exercise, the writer of an option on an
            index is obligated to pay the difference between the cash value of
            the index and the exercise price multiplied by the specified mul-
            tiplier for the index option. An index is designed to reflect
            specified facets of a particular financial or securities market, a
            specific group of financial instruments or securities, or certain
            economic indicators.
               A Fund may sell put or call options it has previously pur-
            chased, which could result in a net gain or loss depending on
            whether the amount realized on the sale is more or less than the
            premium and other transaction costs paid on the put or call option
            which is sold. A Fund may write a call or put option only if the
            option is "covered" by the Fund holding a position in the under-
            lying securities or by other means which would permit immediate
            satisfaction of the Fund's obligation as writer of the option.
            Prior to exercise or expiration, an option may be closed out by an
            offsetting purchase or sale of an option of the same series.
               The Funds may write covered straddles consisting of a combina-
            tion of a call and a put written on the same underlying security.
            A straddle will be covered when sufficient assets are deposited to
            meet the Funds' immediate obligations. The Funds may use the same
            liquid assets to cover both the call and put options where the ex-
            ercise price of the call and put are the same, or the exercise
            price of the call is higher than that of the put. In such cases,
            the Funds will also segregate liquid assets equivalent to the
            amount, if any, by which the put is "in the money."
               The purchase and writing of options involves certain risks.
            During the option period, the covered call writer has, in return
            for the premium on the option, given up the opportunity to profit
            from a price increase in the underlying security above the exer-
            cise price, but, as long as its obligation as a writer continues,
            has retained the risk of loss should the price of the underlying
            security decline. The writer of an option has no control over the
            time when it may be required to fulfill its obligation as a writer
            of the option. Once an option writer has received an exercise no-
            tice, it cannot effect a closing purchase transaction in order to
            terminate its obligation under the option and must deliver the un-
            derlying security at the exercise price. If a put or call option
            purchased by the Fund is not sold when it has remaining value, and
            if the market price of the underlying security remains equal to or
            greater than the exercise price (in the case of a put), or remains
            less than or equal to the exercise price (in the case of a call),
            the Fund will lose its entire
 
          
<PAGE>
 
            investment in the option. Also, where a put or call option on a
            particular security is purchased to hedge against price movements
            in a related security, the price of the put or call option may
            move more or less than the price of the related security. There
            can be no assurance that a liquid market will exist when a Fund
            seeks to close out an option position. Furthermore, if trading re-
            strictions or suspensions are imposed on the options markets, a
            Fund may be unable to close out a position.
               Funds that invest in foreign currency-denominated securities
            may buy or sell put and call options on foreign currencies. Cur-
            rency options traded on U.S. or other exchanges may be subject to
            position limits which may limit the ability of a Fund to reduce
            foreign currency risk using such options. Over-the-counter options
            differ from traded options in that they are two-party contracts,
            with price and other terms negotiated between buyer and seller,
            and generally do not have as much market liquidity as exchange-
            traded options. The Funds may be required to treat as illiquid
            over-the-counter options purchased and securities being used to
            cover certain written over-the-counter options.
                 
            SWAP AGREEMENTS The Fund (except the Money Market and Municipal Bond
            Funds) may enter into interest rate, index, equity and currency
            exchange rate swap agreements. These transactions would be entered
            into in an attempt to obtain a particular return when it is
            considered desirable to do so, possibly at a lower cost to the Fund
            than if the Fund had invested directly in the asset that yielded the
            desired return. Swap agreements are two-party contracts entered into
            primarily by institutional investors for periods ranging from a few
            weeks to more than one year. In a standard swap transaction, two
            parties agree to exchange the returns (or differentials in rates of
            return) earned or realized on particular predetermined investments
            or instruments, which may be adjusted for an interest factor. The
            gross returns to be exchanged or "swapped" between the parties are
            generally calculated with respect to a "notional amount," i.e., the
            return on or increase in value of a particular dollar amount
            invested at a particular interest rate, in a particular foreign
            currency, or in a "basket" of securities representing a particular
            index. Forms of swap agreements include interest rate caps, under
            which, in return for a premium, one party agrees to make payments to
            the other to the extent that interest rates exceed a specified rate,
            or "cap"; interest rate floors, under which, in return for a
            premium, one party agrees to make payments to the other to the
            extent that interest rates fall below a specified level, or
            "floor"; and interest rate collars, under which a party sells a cap
            and purchases a floor or vice versa in an attempt to protect itself
            against interest rate movements exceeding given minimum or maximum
            levels.      
               
               Most swap agreements entered into by the Funds calculate the
            obligations of the parties to the agreement on a "net basis." Con-
            sequently, a Fund's current obligations (or rights) under a swap
            agreement will generally be equal only to the net amount to be
            paid or received under the agreement based on the relative values
            of the positions held by each party to the agreement (the "net
            amount"). A Fund's current obligations under a swap agreement will
            be accrued daily (offset against amounts owed to the Fund), and
            any accrued but unpaid net amounts owed to a swap counterparty
            will be covered by segregation of assets determined to be liquid 
            by the Advisor in accordance with procedures established by the 
            Board of Trustees, to limit any potential leveraging of the Fund's
            portfolio. Obligations under swap agreements so covered will not be
            construed to be "senior securities" for purposes of the Funds' 
            investment restriction concerning senior securities. A Fund will not
            enter into a swap agreement with any single party if the net amount
            owed or to be received under existing contracts with that party 
            would exceed 5% of the Fund's assets.     
               Whether a Fund's use of swap agreements will be successful in
            furthering its investment objective will depend on the Advisor's
            ability to predict correctly whether certain types of investments
            are likely to produce greater returns than other investments. Be-
            cause they are two-party contracts and because they may have terms
            of greater than seven days, swap agreements may be considered to
            be illiquid investments. Moreover, a Fund bears the risk of loss
            of the amount expected to be received under a swap agreement in
            the event of the default or bankruptcy of a swap agreement

         
<PAGE>
 
            counterparty. The Funds will enter into swap agreements only with
            counterparties that meet certain standards for creditworthiness
            (generally, such counterparties would have to be eligible
            counterparties under the terms of the Funds' repurchase agreement
            guidelines). Certain restrictions imposed on the Funds by the In-
            ternal Revenue Code may limit the Funds' ability to use swap
            agreements. The swaps market is a relatively new market and is
            largely unregulated. It is possible that developments in the swaps
            market, including potential government regulation, could adversely
            affect a Fund's ability to terminate existing swap agreements or
            to realize amounts to be received under such agreements.
                 
            FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS Each of the Fixed
            Income Funds (except the Money Market and Municipal Bond Funds) may
            invest in interest rate futures contracts and options thereon
            ("futures options"), and to the extent it may invest in foreign
            currency-denominated securities, may also invest in foreign
            currency futures contracts and options thereon. Each of the Equity
            Funds and the Strategic Balanced Fund may invest in interest rate,
            stock index and foreign currency futures contracts and options
            thereon.      
               There are several risks associated with the use of futures and
            futures options for hedging purposes. There can be no guarantee
            that there will be a correlation between price movements in the
            hedging vehicle and in the portfolio securities being hedged. An
            incorrect correlation could result in a loss on both the hedged
            securities in a Fund and the hedging vehicle, so that the portfo-
            lio return might have been greater had hedging not been attempted.
            There can be no assurance that a liquid market will exist at a
            time when a Fund seeks to close out a futures contract or a
            futures option position. Most futures exchanges and boards of
            trade limit the amount of fluctuation permitted in futures con-
            tract prices during a single day; once the daily limit has been
            reached on a particular contract, no trades may be made that day
            at a price beyond that limit. In addition, certain of these in-
            struments are relatively new and without a significant trading
            history. As a result, there is no assurance that an active second-
            ary market will develop or continue to exist. Lack of a liquid
            market for any reason may prevent a Fund from liquidating an unfa-
            vorable position, and the Fund would remain obligated to meet mar-
            gin requirements until the position is closed.
               The Funds may write covered straddles consisting of a call and
            a put written on the same underlying futures contract. A straddle
            will be covered when sufficient assets are deposited to meet the
            Funds' immediate obligations. A Fund may use the same liquid as-
            sets to cover both the call and put options where the exercise
            price of the call and put are the same, or the exercise price of
            the call is higher than that of the put. In such cases, the Funds
            will also segregate liquid assets equivalent to the amount, if
            any, by which the put is "in the money."
               The Funds will only enter into futures contracts or futures op-
            tions which are standardized and traded on a U.S. or foreign ex-
            change or board of trade, or similar entity, or quoted on an auto-
            mated quotation system. Each Fund will use financial futures con-
            tracts and related options only for "bona fide hedging" purposes,
            as such term is defined in applicable regulations of the Commodity
            Futures Trading Commission ("CFTC"), or, with respect to positions
            in financial futures and related options that do not qualify as
            "bona fide hedging" positions, will enter such positions only to
            the extent that aggregate initial margin deposits plus premiums
            paid by it for open futures option positions, less the amount by
            which any such positions are "in-the-money," would not exceed 5%
            of the Fund's net assets.
     
HYBRID      A hybrid instrument can combine the characteristics of securities, 
INSTRU-     futures, and options. For example, the principal amount or inter-  
MENTS       est rate of a hybrid could be tied (positively or negatively) to   
            the price of some commodity, currency or securities index or an-   
            other interest rate (each a "benchmark"). The interest rate or     
            (unlike most fixed income securities) the principal amount payable 
            at maturity of a hybrid security may be increased or decreased,    
            depending on changes in the value of the benchmark.     
                
               Hybrids can be used as an efficient means of pursuing a variety 
            of investment goals, including currency hedging, duration manage-  
            ment, and increased total return. Hybrids may not bear interest or 
            pay dividends. The value of a hybrid or its interest rate may be a 
            multiple of a benchmark and, as a result, may be leveraged and     
            move (up or down) more      
            
          
<PAGE>
 
                 
            steeply and rapidly than the benchmark. These benchmarks may be
            sensitive to economic and political events, such as commodity
            shortages and currency devaluations, which cannot be readily fore-
            seen by the purchaser of a hybrid. Under certain conditions, the
            redemption value of a hybrid could be zero. Thus, an investment in
            a hybrid may entail significant market risks that are not associ-
            ated with a similar investment in a traditional, U.S. dollar-de-
            nominated bond that has a fixed principal amount and pays a fixed
            rate or floating rate of interest. The purchase of hybrids also
            exposes a Fund to the credit risk of the issuer of the hybrids.
            These risks may cause significant fluctuations in the net asset
            value of the Fund. Accordingly, no Fund will invest more than 5%
            of its assets in hybrid instruments.     
                
               Certain issuers of structured products such as hybrid instru-
            ments may be deemed to be investment companies as defined in the
            1940 Act. As a result, the Funds' investments in these products
            will be subject to limits applicable to investments in investment
            companies and may be subject to restrictions contained in the 1940
            Act.     
    
CATASTROPHE Each of the Fixed Income Funds (except the Money Market Fund) and
BONDS       the StocksPLUS Fund may invest in "catastrophe bonds." Catastrophe
            bonds are fixed income securities, for which the return of princi-
            pal and payment of interest is contingent on the non-occurrence of
            a specific "trigger" catastrophic event, such as a hurricane or an
            earthquake. They may be issued by government agencies, insurance
            companies, reinsurers, special purpose corporations or other on-
            shore or off-shore entities. If a trigger event causes losses ex-
            ceeding a specific amount in the geographic region and time period
            specified in a bond, a Fund investing in the bond may lose a por-
            tion or all of its principal invested in the bond. If no trigger
            event occurs, the Fund will recover its principal plus interest.
            For some catastrophe bonds, the trigger event or losses may be
            based on companywide losses, index-portfolio losses, industry in-
            dices, or readings of scientific instruments rather than specified
            actual losses. Often the catastrophe bonds provide for extensions
            of maturity that are mandatory, or optional at the discretion of
            the issuer, in order to process and audit loss claims in those
            cases where a trigger event has, or possibly has, occurred. In ad-
            dition to the specified trigger events, catastrophe bonds may also
            expose the Fund to certain unanticipated risks including but not
            limited to issuer (credit) default, adverse regulatory or juris-
            dictional interpretations, and adverse tax consequences.
               Catastrophe bonds are a relatively new type of financial in-
            strument. As such, there is no significant trading history of
            these securities, and there can be no assurance that a liquid mar-
            ket in these instruments will develop. See "Illiquid Securities"
            below. Lack of a liquid market may impose the risk of higher
            transaction costs and the possibility that a Fund may be forced to
            liquidate positions when it would not be advantageous to do so.
            Catastrophe bonds are typically rated, and a Fund will only invest
            in catastrophe bonds that meet the credit quality requirements for
            the Fund.      
    
INVESTMENT  Each of the Funds may invest in securities of other investment    
IN INVEST-  companies, such as closed-end management investment companies, or 
MENT        in pooled accounts or other investment vehicles. As a shareholder 
COMPANIES   of an investment company, a Fund may indirectly bear service and  
            other fees which are in addition to the fees the Fund pays its    
            service providers.     
 
     
PORTFOLIO   The length of time a Fund has held a particular security is not
TURNOVER    generally a consideration in investment decisions. The investment
            policies of a Fund may lead to frequent changes in the Fund's in-
            vestments, particularly in periods of volatile market movements. A
            change in the securities held by a Fund is known as "portfolio
            turnover." High portfolio turnover (e.g., over 100%) involves cor-
            respondingly greater expenses to a Fund, including brokerage com-
            missions or dealer mark-ups and other transaction costs on the
            sale of securities and reinvestments in other securities. Such
            sales may result in realization of taxable capital gains. See
            "Taxes." The portfolio turnover rate for certain of the Funds is
            set forth under "Financial Highlights." The portfolio turnover
            rate for certain of the Funds which offer Institutional or Admin-
            istrative Class shares, is incorporated by reference in the State-
            ment of Additional Information.     
 
     
ILLIQUID    Each of the Funds may invest up to 15% of its net assets in illiq-
SECURITIES  uid securities (10% in the case of the Money Market Fund). Certain
            illiquid securities may require pricing at fair value as deter-
            mined in good faith under the supervision of the Board of Trust-
            ees. The Advisor may be subject to significant delays in disposing
            of illiquid securities, and transactions in illiquid securities
            may entail registration expenses and other transaction costs that
            are higher than transactions in liquid securities. The term "il-
            liquid securities" for this purpose means securities that cannot
            be disposed of within seven days in the ordinary course of busi-
            ness at approximately the amount at which a Fund has valued the
            securities. Illiquid securities are considered to include, among
            other things, written over-the-counter options, securities or
            other liquid assets being used as cover for such options, repur-
            chase agreements with maturities in excess of seven days, certain
            loan participation interests, fixed time deposits which are not
            subject to prepayment or provide for withdrawal penalties upon
            prepayment (other than overnight deposits), securities that are
            subject to legal or contractual restrictions on resale and other
            securities whose disposition is restricted under the federal secu-
            rities laws (other than securities issued pursuant to Rule 144A
            under the Securities Act of 1933 and certain commercial paper that
            Pacific Investment Management has determined to be liquid under
            procedures approved by the Board of Trustees).     
    
            Illiquid securities may include privately placed securities, which
            are sold directly to a small number of investors, usually 
            institutions.  Unlike public offerings, such securities are not
            registered under the federal securities laws.  Although certain of
            these securities may be readily sold, for example, under Rule 144A,
            others may be illiquid, and their sale may involve substantial
            delays and additional costs.     
    
SERVICE     Many of the services provided to the Funds depend on the smooth
SYSTEMS--   functioning of computer systems. Many systems in use today cannot
YEAR 2000   distinguish between the year 1900 and the year 2000. Should any of
PROBLEM     the service systems fail to process information properly, that
            could have an adverse impact on the Funds' operations and services
            provided to shareholders. The Adviser, Distributor, Shareholder
            Servicing and Transfer Agent, Custodian, and certain other service
            providers to the Funds have reported that each is working toward
            mitigating the risks associated with the so-called "year 2000
            problem." However, there can be no assurance that the problem will
            be corrected in all respects and that the Funds' operations and
            services provided to shareholders will not be adversely 
            affected.      

         
<PAGE>

            Performance Information
 
            From time to time the Trust may make available certain information
            about the performance of the Class A, Class B and Class C shares
            of some or all of the Funds. Performance information is computed
            separately for each Fund's Class A, Class B and Class C shares in
            accordance with the formulas described below. Because Class B and
            Class C shares bear the expense of the distribution fee attending
            the deferred sales charge (Class B) and asset based sales charge
            (Class C) alternatives and certain other expenses, it is expected
            that, under normal circumstances, the yield and the level of per-
            formance of a Fund's Class B and Class C shares will be lower than
            that of the Fund's Class A shares although an investment in Class
            B or Class C shares is not reduced by the front-end sales charge
            generally applicable to an investment in Class A shares.
               The Trust may, from time to time, include the yield and total
            return for each class of shares of its Funds in advertisements or
            reports to shareholders or prospective investors. Yield quotations
            for the Money Market Fund may include current yield and effective
            yield. Current yield will be based on income received by a hypo-
            thetical investment over a given seven-day period (less expenses
            accrued during the period) and "annualized" (i.e., assuming that
            the seven-day yield would be received for 52 weeks, stated in
            terms of an annual percentage return on the investment). Effective
            yield for the Fund is calculated in the manner similar to that
            used to calculate current yield, but reflects the compounding ef-
            fect on earnings of reinvested dividends. For the remaining Funds,
            quotations of yield for a Fund or class will be based on the in-
            vestment income per share (as defined by the Securities and Ex-
            change Commission) during a particular 30-day (or one-month) pe-
            riod (including dividends and interest), less expenses accrued
            during the period ("net investment income"), and will be computed
            by dividing net investment income by the maximum public offering
            price per share on the last day of the period.
                                
               The total return of Class A, Class B and/or Class C shares of
            all Funds may be included in advertisements or other written mate-
            rial. When a Fund advertises its total return with respect to its
            Class A, Class B and Class C shares, it will be calculated for the
            past year, the past five years, and the past ten years (or if the
            Fund has been offered for a period shorter than one-, five- or
            ten- years, that period will be substituted) since the establish-
            ment of the Fund (or its predecessor series of PIMCO Advisors
            Funds for the Global Bond Fund II), as more fully described in the
            Statement of Additional Information. For periods prior to the
            initial offering date of a particular class, total return
            presentations for the class will be based on the historical
            performance of an older class of the Fund (if any) restated to
            reflect current sales charges (if any) of the newer class. The older
            class to be used in each case is set forth in the Statement of
            Additional Information. For these purposes, the performance of the
            older class will also be restated to reflect any different operating
            expenses (such as different administrative fees and/or 12b-
            1/servicing fee charges) associated with the newer class. In certain
            cases, such a restatement will result in performance of the newer
            class which is higher than if the performance of the older class
            were not restated to reflect the different operating expenses of
            the newer class. In such cases, the Trust's advertisements will
            also, to the extent appropriate, show the lower performance figure
            reflecting the actual operating expenses incurred by the older class
            for periods prior to the initial offering date of the newer class.
            Total return for each class is measured by comparing the value of an
            investment in the Fund at the beginning of the relevant pe-riod (in
            the case of Class A shares, giving effect to the maximum initial
            sales charge) to the redemption value of the investment in the Fund
            at the end of the period (assuming immediate reinvestment of any
            dividends or capital gains distributions at net asset value and
            giving effect to the deduction of the maximum CDSC which would be
            payable). The Funds may advertise total return using alternative
            methods that reflect all elements of return, but that may be
            adjusted to reflect the cumulative impact of alternative fee and
            expense structures, such as the currently effective advisory and
            administrative fees for the Funds.                     

               Current distribution information may also be provided to the
            Trust's shareholders in shareholder reports or other shareholder
            communications, or in certain types of sales literature provided to
            prospective investors. Current distribution information for a
            particular class of a Fund will be based on distributions for a
            specified period (i.e., total dividends from net investment
            income), divided by the relevant class net asset value per share on
            the last day of the period and annualized. The rate of current
            distributions does not reflect deductions for unrealized losses
            from transactions in derivative instruments such as options and
            futures, which may reduce total return. Current distribution rates
            differ from standardized yield rates in that they represent what a
            class of a Fund has declared and paid to shareholders as of the end
            of a specified period rather than the Fund's actual net investment
            income for that period.     
                
               Performance information for the Trust may also be compared to
            various unmanaged indexes, such as the Standard & Poor's 500 Com-
            posite Stock Price Index, the Lehman Brothers Aggregate Bond In-
            dex, the Lehman Brothers Mortgage-Backed Securities Index, the
            Merrill Lynch 1 to 3 Year Treasury Index, the Lehman Intermediate
            and 20+ Year Treasury Blend Index, the Lehman BB Intermediate Cor-
            porate Index, indexes prepared by Lipper Analytical Services, the
            J.P. Morgan Global Index, the J.P. Morgan Emerging Markets Bond
            Index Plus, the Salomon Brothers World Government Bond Index-10
            Non U.S.-Dollar Hedged and the J.P. Morgan Government Bond Index
            Non U.S.-Dollar Hedged, and other entities or organizations which
            track the performance of investment companies or investment advis-
            ers. Unmanaged indexes (i.e., other than Lipper) generally do not
            reflect deductions for administrative and management costs and ex-
            penses. The Advisor may also report to shareholders or to the pub-
            lic in advertisements concerning the performance of the Advisor as
            adviser to clients other than the Trust, and on the comparative
            performance or standing of the Advisor in relation to other money
            managers. Such comparative information may be compiled or provided
            by independent ratings services or by news organizations. Any per-
            formance information, whether related to the Funds or to the Advi-
            sor, should be considered in light of a Fund's investment objec-
            tives and policies, characteristics and quality of the portfolio,
            and the market conditions during the time period indicated, and
            should not be considered     
 
          
<PAGE>
 
            to be representative of what may be achieved in the future. For a
            description of the methods used to determine yield and total re-
            turn for the Funds, see the Statement of Additional Information.
               Investment results of the Funds will fluctuate over time, and
            any presentation of the Funds' total return or yield for any prior
            period should not be considered as a representation of what an in-
            vestor's total return or yield may be in any future period.
 
            How to Buy Shares
               
            Class A, Class B and Class C shares of each Fund of the Trust are
            continuously offered through the Trust's principal underwriter,
            PIMCO Funds Distributors LLC (the "Distributor"), and through other
            firms which have dealer agreements with the Distributor
            ("participating brokers") or which have agreed to act as introduc-
            ing brokers for the Distributor ("introducing brokers").     
               There are two ways to purchase Class A, Class B or Class C
            shares: either 1) through your dealer or broker which has a dealer
            agreement with the Distributor; or 2) directly by mailing a PIMCO
            Funds Account Application included with this Prospectus (the "Ac-
            count Application") with payment, as described below under the
            heading Direct Investment, to the Distributor (if no dealer is
            named in the Account Application, the Distributor may act as deal-
            er).
               Each Fund currently offers and sells three classes of shares in
            this Prospectus (Class A, Class B and Class C). Institutional
            Class shares and Administrative Class shares of certain of the
            Funds are offered through a separate prospectus. Shares may be
            purchased at a price equal to their net asset value per share next
            determined after receipt of an order, plus a sales charge which,
            at the election of the purchaser, may be imposed either (i) at the
            time of the purchase in the case of Class A shares (the "initial
            sales charge alternative"), (ii) on a contingent deferred basis in
            the case of Class B shares (the "deferred sales charge alterna-
            tive"), or (iii) by the deduction of an ongoing asset based sales
            charge in the case of Class C shares (the "asset based sales
            charge alternative"). In certain circumstances, Class A and Class
            C shares are also subject to a CDSC, and, in the case of the
            StocksPLUS Short Strategy Fund, a redemption fee. See "Alternative
            Purchase Arrangements." Purchase payments for Class B and Class C
            shares are fully invested at the net asset value next determined
            after acceptance of the trade. Purchase payments for Class A
            shares, less the applicable sales charge, are invested at the net
            asset value next determined after acceptance of the trade.
               All purchase orders received by the Distributor prior to the
            close of regular trading (normally 4:00 p.m. Eastern time) on the
            New York Stock Exchange (the "Exchange"), on a regular business
            day, are processed at that day's offering price. However, orders
            received by the Distributor from dealers or brokers after the of-
            fering price is determined that day will receive such offering
            price if the orders were received by the dealer or broker from its
            customer prior to such determination and were transmitted to and
            received by the Distributor prior to its close of business that
            day (normally 5:00 p.m. Eastern time) or, in the case of certain
            retirement plans, received by the Distributor prior to 9:30 a.m.
            Eastern time on the next business day. Purchase orders received on
            other than a regular business day will be executed on the next
            succeeding regular business day. The Distributor, in its sole dis-
            cretion, may accept or reject any order for purchase of Fund
            shares. The sale of shares will be suspended during any period in
            which the Exchange is closed for other than weekends or holidays,
            or if permitted by the rules of the Securities and Exchange Com-
            mission when trading on the Exchange is restricted or during an
            emergency which makes it impracticable for the Funds to dispose of
            their securities or to determine fairly the value of their net as-
            sets, or during any other period as permitted by the Securities
            and Exchange Commission for the protection of investors.     

                                                            
<PAGE>

               
               Except for gifts to minors or purchases through the PIMCO Auto
            Invest plan, the PIMCO Auto Exchange plan and tax-qualified pro-
            grams referred to below, the minimum initial investment in Class
            A, Class B or Class C shares of any Fund of the Trust is $2,500, and
            the minimum additional investment is $100 per Fund. The minimum
            initial investment for gifts to minors is $250 per Fund. For
            information about dealer commissions, see "Alternative Purchase
            Arrangements" below. Persons selling Fund shares may receive
            different compensation for selling Class A, Class B or Class C
            shares. Normally, Fund shares purchased through participating
            brokers are held in the investor's account with that broker. No
            share certificates will be issued unless specifically requested in
            writing by an investor or broker-dealer.     
 
DIRECT      Investors who wish to invest in Class A, Class B or Class C shares
INVESTMENT  of the Trust directly, rather than through a participating broker,
            may do so by opening an account with the Distributor. To open an
            account, an investor should complete the Account Application in-
            cluded with this Prospectus. All shareholders who open direct ac-
            counts with the Distributor will receive from the Distributor in-
            dividual confirmations of each purchase, redemption, dividend re-
            investment, exchange or transfer of Trust shares, including the
            total number of Trust shares owned as of the confirmation date,
            except that purchases which result from the reinvestment of daily-
            accrued dividends and/or distributions will be confirmed once each
            calendar quarter. See "Distributions" below. Information regarding
            direct investment or any other features or plans offered by the
            Trust may be obtained by calling the Distributor at 800-426-0107
            or by calling your broker.

               
PURCHASE BY Investors who wish to invest directly may send a check payable to
MAIL        PIMCO Funds Distributors LLC, along with a completed application 
            form to:     
                  
               PIMCO Funds Distributors LLC
               P.O. Box 5866
               Denver, CO 80217-5866     
 
               Purchases are accepted subject to collection of checks at full
            value and conversion into federal funds. Payment by a check drawn
            on any member of the Federal Reserve System can normally be con-
            verted into federal funds within two business days after receipt
            of the check. Checks drawn on a non-member bank may take up to 15
            days to convert into federal funds. In all cases, the purchase
            price is based on the net asset value next determined after the
            purchase order and check are accepted, even though the check may
            not yet have been converted into federal funds.
 
               
SUBSEQUENT  Subsequent purchases of Class A, Class B or Class C shares can be
PURCHASES   made as indicated above by mailing a check with a letter describ-
OF SHARES   ing the investment or with the additional investment portion of a
            confirmation statement. Except for subsequent purchases through
            the PIMCO Auto Invest plan, the PIMCO Auto Exchange plan, tax-
            qualified programs and PIMCO Fund Link referred to below, and ex-
            cept during periods when an Automatic Withdrawal plan is in ef-
            fect, the minimum subsequent purchase is $100 in any Fund. All
            payments should be made payable to PIMCO Funds Distributors LLC and
            should clearly indicate the shareholder's account number. Checks
            should be mailed to the address above under "Purchase by Mail."     
            
               
TAX-        The Distributor makes available retirement plan services and docu-
QUALIFIED   ments for Individual Retirement Accounts (IRAs), including Roth 
RETIREMENT  IRAs, for which First National Bank of Boston serves as trustee and 
PLANS       or IRA accounts established with Form 5305-SIMPLE under the Internal
            Revenue Code. These accounts include Simplified Employee Pension
            Plan (SEP) and Salary     
       
<PAGE>
 
            Reduction Simplified Employee Pension Plan (SAR/SEP) IRA accounts
            and prototype documents. In addition, prototype documents are
            available for establishing 403(b)(7) Custodial Accounts with First
            National Bank of Boston as custodian. This type of plan is avail-
            able to employees of certain non-profit organizations.
               
               The Distributor also makes available prototype documents for
            establishing Money Purchase and/or Profit Sharing Plans and 401(k)
            Retirement Savings Plans. Investors should call the Distributor at
            800-426-0107 for further information about these plans and should
            consult with their own tax advisers before establishing any re-
            tirement plan. Investors who maintain their accounts with partici-
            pating brokers should consult their broker about similar types of
            accounts that may be offered through the broker. The minimum initial
            investment for all tax qualified plans (except for employer-
            sponsored plans, SIMPLE IRAs, SEPs and SAR/SEPs) is $1,000 per Fund
            and the minimum subsequent investment is $100 and the minimum
            initial investment for employer-sponsored plans, SIMPLE IRAs, SEPs
            and SAR/SEPs and the minimum subsequent investment per Fund for all
            such plans is $50.     
 
               
PIMCO AUTO  The PIMCO Auto Invest plan provides for periodic investments into
INVEST      the shareholder's account with the Trust by means of automatic
            transfers of a designated amount from the shareholder's bank ac-
            count. The minimum investment for eligibility in the PIMCO Auto 
            Invest plan is $1,000 per Fund. Subsequent investments may be made
            monthly or quarterly, and may be in any amount subject to a minimum
            of $50 per month for each Fund in which shares are purchased through
            the plan. Further information regarding the PIMCO Auto Invest plan
            is available from the Distributor or participating brokers. You may
            enroll by completing the appropriate section on the Account
            Application, or you may obtain an Auto Invest Application by calling
            the Distributor or your broker.     
 
 
PIMCO AUTO  The PIMCO Auto Exchange plan establishes regular, periodic ex-
EXCHANGE    changes from one Fund to another Fund or a series of PIMCO Funds:
            Multi-Manager Series which offers Class A, Class B or Class C
            shares. The plan provides for regular investments into a share-
            holder's account in a specific Fund by means of automatic ex-
            changes of a designated amount from another Fund account of the
            same class of shares and with identical account registration.
               Exchanges may be made monthly or quarterly, and may be in any
            amount subject to a minimum of $50 for each Fund whose shares are
            purchased through the plan. Further information regarding the
            PIMCO Auto Exchange plan is available from the Distributor at 800-
            426-0107 or participating brokers. You may enroll by completing an
            application which may be obtained from the Distributor or by tele-
            phone request at 800-426-0107. For more information on exchanges,
            see "Exchange Privilege."
 
     
PIMCO FUND  PIMCO Fund Link ("Fund Link") connects your Fund account with a
LINK        bank account. Fund Link may be used for subsequent purchases and
            for redemptions and other transactions described under "How to Re-
            deem." Purchase transactions are effected by electronic funds
            transfers from the shareholder's account at a U.S. bank or other
            financial institution that is an Automated Clearing House ("ACH")
            member. Investors may use Fund Link to make subsequent purchases
            of shares in amounts from $50 to $10,000. To initiate such pur-
            chases, call 800-426-0107. All such calls will be recorded. Fund
            Link is normally established within 45 days of receipt of a Fund
            Link Application by Shareholder Services, Inc. (the "Transfer
            Agent"). The minimum investment by Fund Link is $50 per Fund.
            Shares will be purchased on the regular business day the Distribu-
            tor receives the funds through the ACH system, provided the funds
            are received before the close of regular trading on the Exchange.
            If the funds are received after the close of regular trading, the
            shares will be purchased on the next regular business day.     
               Fund Link privileges must be requested on the Account Applica-
            tion. To establish Fund Link on an existing account, complete a
            Fund Link Application, which is available from the Distributor or
            your broker, with signatures guaranteed from all shareholders of
            record for the account. See "Signature Guarantee" below. Such
            privileges apply to each shareholder of record for the account un-
            less and until the Distributor receives written instructions from
            a shareholder of record canceling such privileges. Changes of bank
            account information must be made by completing a new Fund Link Ap-
            plication signed by all owners of record of the account, with all
            signatures guaranteed. The Distributor,

                                                            
<PAGE>

              the Transfer Agent and the Fund may rely on any telephone instruc-
              tions believed to be genuine and will not be responsible to share-
              holders for any damage, loss or expenses arising out of such in-
              structions. The Fund reserves the right to amend, suspend or dis-
              continue Fund Link privileges at any time without prior notice.
              Fund Link does not apply to shares held in broker "street name"
              accounts.
 
SIGNATURE     When a signature guarantee is called for, the shareholder should
GUARANTEE     have "Signature Guaranteed" stamped under his signature and guar-
              anteed by any of the following entities: U.S. banks, foreign banks
              having a U.S. correspondent bank, credit unions, savings associa-
              tions, U.S. registered dealers and brokers, municipal securities
              dealers and brokers, government securities dealers and brokers,
              national securities exchanges, registered securities associations
              and clearing agencies (each an "Eligible Guarantor Institution").
              The Distributor reserves the right to reject any signature guaran-
              tee pursuant to its written signature guarantee standards or pro-
              cedures, which may be revised in the future to permit it to reject
              signature guarantees from Eligible Guarantor Institutions that do
              not, based on credit guidelines, satisfy such written standards or
              procedures. The Trust may change the signature guarantee require-
              ments from time to time upon notice to shareholders, which may be
              given by means of a new or supplemented Prospectus.
  
ACCOUNT       Changes in registration or account privileges may be made in writ-
REGISTRATION  ing to the Transfer Agent. Signature guarantees may be required.
CHANGES       See "Signature Guarantee" above. All correspondence must include
              the account number and must be sent to:
                       
                  PIMCO Funds Distributors LLC
                  P.O. Box 5866
                  Denver, CO 80217-5866      
    
SMALL         Because of the disproportionately high costs of servicing accounts
ACCOUNT FEE   with low balances, a fee at an annual rate of $16, paid to Pacific
              Investment Management, the Funds' administrator, will automati-
              cally be deducted from direct accounts with balances falling below
              a minimum level. The valuation of accounts and the deduction are
              expected to take place during the last five days of each calendar
              quarter. The fee will be deducted in quarterly installments from
              accounts with balances below $2,500 except for Uniform Gift to Mi-
              nors, IRA, Roth IRA and Auto-Invest accounts, for which the limit
              is $1,000. The fee will not apply to employer-sponsored retirement
              accounts or 403(b)(7) custodial accounts. (A separate custodial
              fee may apply to IRAs, Roth IRAs and other retirement accounts.)
              No fee will be charged on any account of a shareholder if the ag-
              gregate value of all of the shareholder's accounts is at least
              $50,000. No small account fee will be charged to employee and em-
              ployee-related accounts of PIMCO Advisors and/or its affiliates.
                   
     
MINIMUM       Due to the relatively high cost to the Funds of maintaining small
ACCOUNT       accounts, you are asked to maintain an account balance of at least
SIZE          the amount necessary to open the type of account involved. If your
              balance is below such minimum for three months or longer, the
              Fund's administrator shall have the right (except in the case of
              employer-sponsored retirement accounts) to close your account af-
              ter giving you 60 days in which to increase your balance. Your ac-
              count will not be liquidated if the reduction in size is due
              solely to market decline in the value of your Fund shares or if
              the aggregate value of all your accounts in PIMCO Funds exceeds
              $50,000.        
 
              Alternative Purchase Arrangements
                                   
              The Trust offers investors three classes of shares in this Pro-
              spectus (Class A, Class B and Class C) which bear sales charges in
              different forms and amounts and which bear different levels of ex-
              penses. Through a separate prospectus, certain of the Funds offer
              up to three additional classes of shares, Class D, Institutional
              Class shares and Administrative Class shares. Class D shares are
              offered through financial intermediaries. Institutional and
              Administrative Class shares are offered to pension and profit
              sharing plans, employee benefit plans, endowments, foundations,
              corporations and other high net worth individuals. Class D,
              Institutional Class and Administrative Class shares are sold
              without sales charges and have different expenses than Class A,
              Class B and Class C shares. As a result of lower sales charges
              and/or operating expenses, Class D, Administrative Class and
              Institutional Class shares are generally expected to achieve a
              higher investment return than Class A, Class B or Class C shares.
              To obtain more information about the other classes of shares,
              please call the Distributor at 800-927-4648 (Institutional Class
              or Administrative Class) or 888-87-PIMCO (Class D).      

                 The alternative purchase arrangements offered in this Prospec-
              tus are designed to enable a retail investor to choose the method
              of purchasing Fund shares that is most beneficial to the investor
              based on all factors to be considered, which include: the amount
              and intended length of the investment; the particular Fund; and
              whether the investor intends to exchange shares for shares of
              other Funds. Generally, when making an investment decision, in-
              vestors should consider the anticipated life of an intended in-
              vestment in the Funds, the accumulated distribution and servicing
              fees plus CDSCs on Class B or Class C shares, the initial sales
              charge plus accumulated servicing fees on Class A shares (plus a
              CDSC in certain circumstances), the possibility that the antici-
              pated higher return on Class A shares due to the lower ongoing
              charges will offset the initial sales charge paid on such shares,
              the automatic conversion of Class B shares to Class A shares and
              the difference in the CDSCs applicable to Class A, Class B and
              Class C shares.
 
         
<PAGE>
 
            CLASS A The initial sales charge alternative (Class A) might be
            preferred by investors purchasing shares of sufficient aggregate
            value to qualify for reductions in the initial sales charge appli-
            cable to such shares. Similar reductions are not available on the
            contingent deferred sales charge alternative (Class B) or the as-
            set based sales charge alternative (Class C). Class A shares are
            subject to a servicing fee but are not subject to a distribution
            fee and, accordingly, such shares are expected to pay correspond-
            ingly higher dividends on a per share basis. However, because ini-
            tial sales charges are deducted at the time of purchase, not all
            of the purchase payment for Class A shares is invested initially.
            Class B and Class C shares might be preferable to investors who
            wish to have all purchase payments invested initially, although
            remaining subject to higher distribution and servicing fees and,
            for certain periods, being subject to a CDSC. An investor who
            qualifies for an elimination of the Class A initial sales charge
            should also consider whether he or she anticipates redeeming
            shares in a time period which will subject such shares to a CDSC
            as described below. See "Initial Sales Charge Alternative--Class A
            Shares--Class A Deferred Sales Charge" below.
                
            CLASS B Class B shares might be preferred by investors who intend
            to invest in the Funds for longer periods and who do not intend to
            purchase shares of sufficient aggregate value to qualify for sales
            charge reductions applicable to Class A shares. Both Class B and
            Class C shares can be purchased at net asset value without an ini-
            tial sales charge. However, unlike Class C shares, Class B shares
            convert into Class A shares after the shares have been held for
            seven years. After the conversion takes place, the shares will no
            longer be subject to a CDSC, and will be subject to the servicing
            fees charged for Class A shares which are lower than the distribu-
            tion and servicing fees charged on either Class B or Class C
            shares. See "Deferred Sales Charge Alternative--Class B Shares"
            below. Class B shares are not available for purchase by employer 
            sponsored retirement plans.     
 
            CLASS C Class C shares might be preferred by investors who intend
            to purchase shares which are not of sufficient aggregate value to
            qualify for Class A sales charges of 1% or less and who wish to
            have all purchase payments invested initially. Class C shares are
            preferable to Class B shares for investors who intend to maintain
            their investment for intermediate periods and therefore may also
            be preferable for investors who are unsure of the intended length
            of their investment. Unlike Class B shares, Class C shares are not
            subject to a CDSC after they have been held for one year and are
            subject to only a 1% CDSC during the first year. However, because
            Class C shares do not convert into Class A shares, Class B shares
            are preferable to Class C shares for investors who intend to main-
            tain their investment in the Funds for long periods. See "Asset
            Based Sales Charge Alternative--Class C Shares" below.
               In determining which class of shares to purchase, an investor
            should always consider whether any waiver or reduction of a sales
            charge or a CDSC is available. See generally "Initial Sales Charge
            Alternative--Class A Shares" and "Waiver of Contingent Deferred
            Sales Charges" below.
               The maximum single purchase of Class B shares accepted is
            $249,999. The maximum single purchase of Class C shares accepted
            is $999,999. The Funds may refuse any order to purchase shares.
               For a description of the Distribution and Servicing Plans and
            distribution and servicing fees payable thereunder with respect to
            Class A, Class B and Class C shares, see "Distributor and Distri-
            bution and Servicing Plans" below.
                
            WAIVER OF CONTINGENT DEFERRED SALES CHARGES The CDSC applicable to
            Class A and Class C shares is currently waived for (i) any partial
            or complete redemption in connection with any of the following
            distributions from a retirement plan, including a 403(b)(7)
            custodial account or an IRA (with the exception of a Roth IRA), that
            qualify for exemption from the additional tax on early distributions
            under Section 72(t) of the Internal Revenue Code of 1986, as amended
            (the "Code"): (a) upon attaining age 59 1/2, (b) on account of death
            or disability, (c) as part of a series of substantially equal
            periodic payments, (d) in the case of an IRA (with the exception of
            a Roth IRA), attributable to qualified higher education expenses or
            to qualified first-time home-buyer expenses, or (e) in the case of a
            retirement plan other than an IRA, upon separation from service
            after attaining age 55; (ii) any partial or complete redemption in
            connection with a qualifying loan or hardship withdrawal from an
            employer sponsored retirement plan; (iii) any complete redemption in
            connection with a distribution from a qualified employer retirement
            plan in connec-     

        
<PAGE>
 
            tion with termination of employment or termination of the employ-
            er's plan and the transfer to another employer's plan or to an
            IRA; (iv) any partial or complete redemption following death or
            disability (as defined in the Code) of a shareholder (including
            one who owns the shares as joint tenant with his or her spouse)
            from an account in which the deceased or disabled is named, pro-
            vided the redemption is requested within one year of the death or
            initial determination of disability; (v) any redemption resulting
            from a return of an excess contribution to a qualified employer
            retirement plan or an IRA; (vi) certain periodic redemptions under
            an Automatic Withdrawal Plan from an account meeting certain mini-
            mum balance requirements, in amounts meeting certain maximums es-
            tablished from time to time by the Distributor; (vii) redemptions
            by Trustees, officers and employees of the Trust, and by direc-
            tors, officers and employees of the Distributor and the Advisor;
            (viii) redemptions effected pursuant to a Fund's right to involun-
            tarily redeem a shareholder's account if the aggregate net asset
            value of shares held in such shareholder's account is less than a
            minimum account size specified in such Fund's prospectus; (ix) in-
            voluntary redemptions caused by operation of law; (x) redemption
            of shares of any Fund that is combined with another Fund, invest-
            ment company, or personal holding company by virtue of a merger,
            acquisition or other similar reorganization transaction; (xi) re-
            demptions by a shareholder who is a participant making periodic
            purchases of not less than $50 through certain employer sponsored
            savings plans that are clients of a broker-dealer with which the
            Distributor has an agreement with respect to such purchases; (xii)
            redemptions effected by trustees or other fiduciaries who have
            purchased shares for employer sponsored plans, the administrator
            for which has an agreement with the Distributor with respect to
            such purchases; or (xiii) redemptions in connection with IRA ac-
            counts established with Form 5305-SIMPLE under the Code for which
            the Trust is the designated financial institution.
               The CDSC applicable to Class B shares is currently waived for
            any partial or complete redemption (a) in connection with a dis-
            tribution without penalty under Section 72(t) of the Code from a
            403(b)(7) plan or an IRA upon attaining age 59 1/2; (b) following
            death or disability (as defined in the Code) of a shareholder (in-
            cluding one who owns the shares as joint tenant with his or her
            spouse) from an account in which the deceased or disabled is
            named, provided the redemption is requested within one year of the
            death or initial determination of disability; and (c) of up to 10%
            per year of the value of an account subject to an Automatic With-
            drawal Plan. See "How to Redeem--Automatic Withdrawal Plan."
               The Distributor may require documentation prior to waiver of
            the CDSC for any class, including distribution letters, certifica-
            tion by plan administrators, applicable tax forms, death certifi-
            cates, physicians' certificates, etc.
 
       
<PAGE>
 
INITIAL     Class A shares are sold at a public offering price equal to their
SALES       net asset value per share plus a sales charge, as set forth below.
CHARGE      As indicated below under "Class A Deferred Sales Charge," certain
ALTERNA-    investors that purchase $1,000,000 or more of any Fund's Class A
TIVE --     shares (and thus pay no initial sales charge) may be subject to a
CLASS A     1% CDSC if they redeem such shares during the first 18 months af-
SHARES      ter their purchase.
                 
              ALL FUNDS (EXCEPT MONEY MARKET, SHORT-TERM, REAL RETURN BOND, 
              MUNICIPAL BOND, LOW DURATION, LOW DURATION MORTGAGE AND STOCKSPLUS
              FUNDS)         
 
<TABLE>
<CAPTION>
                                SALES CHARGE                    DISCOUNT OR
                                AS % OF NET  SALES CHARGE       COMMISSION TO
           AMOUNT OF            AMOUNT       AS % OF THE PUBLIC DEALERS AS % OF
           PURCHASE             INVESTED     OFFERING PRICE     PUBLIC OFFERING PRICE
              -----------------------------------------------------------------------
           <S>                  <C>          <C>                <C>
           $0 - $49,999         4.71%           4.50%              4.00%
              -----------------------------------------------------------------------
           $50,000 - $99,999    4.17%           4.00%              3.50%
              -----------------------------------------------------------------------
           $100,000 - $249,999  3.63%           3.50%              3.00%
              -----------------------------------------------------------------------
           $250,000 - $499,999  2.56%           2.50%              2.00%
              -----------------------------------------------------------------------
           $500,000 - $999,999  2.04%           2.00%              1.75%
              -----------------------------------------------------------------------
           $1,000,000+          0.00%/1/     0.00%/1/           0.50%/2/
</TABLE>
                 
              REAL RETURN BOND, MUNICIPAL BOND, LOW DURATION, LOW DURATION 
              MORTGAGE AND STOCKSPLUS FUNDS          
<TABLE>
<CAPTION>
                                SALES CHARGE                    DISCOUNT OR
                                AS % OF NET  SALES CHARGE       COMMISSION TO
           AMOUNT OF            AMOUNT       AS % OF THE PUBLIC DEALERS AS % OF
           PURCHASE             INVESTED     OFFERING PRICE     PUBLIC OFFERING PRICE
              -----------------------------------------------------------------------
           <S>                  <C>          <C>                <C>
           $0 - $49,999         3.09%        3.00%                 2.50%
              -----------------------------------------------------------------------
           $50,000 - $99,999    2.56%        2.50%                 2.00%
              -----------------------------------------------------------------------
           $100,000 - $249,999  2.04%        2.00%                 1.75%
              -----------------------------------------------------------------------
           $250,000 - $499,999  1.52%        1.50%                 1.25%
              -----------------------------------------------------------------------
           $500,000 - $999,999  1.27%        1.25%                 1.00%
              -----------------------------------------------------------------------
           $1,000,000+          0.00%/1/     0.00%/1/           0.50%/2/
</TABLE>
 
              SHORT-TERM FUND
<TABLE>
<CAPTION>
                                SALES CHARGE                    DISCOUNT OR
                                AS % OF NET  SALES CHARGE       COMMISSION TO
           AMOUNT OF            AMOUNT       AS % OF THE PUBLIC DEALERS AS % OF
           PURCHASE             INVESTED     OFFERING PRICE     PUBLIC OFFERING PRICE
              -----------------------------------------------------------------------
           <S>                  <C>          <C>                <C>
           $0 - $49,999         2.04%        2.00%                 1.75%
              -----------------------------------------------------------------------
           $50,000 - $99,999    1,78%        1.75%                 1.50%
              -----------------------------------------------------------------------
           $100,000 - $249,999  1.52%        1.50%                 1.25%
              -----------------------------------------------------------------------
           $250,000 - $499,999  1.27%        1.25%                 1.00%
              -----------------------------------------------------------------------
           $500,000 - $999,999  1.01%        1.00%                 0.75%
              -----------------------------------------------------------------------
           $1,000,000+          0.00%/1/     0.00%/1/           0.25%/2/
</TABLE>
               
            1. As shown, investors that purchase more than $1,000,000 of any
            Fund's Class A shares ($250,000 in the case of the Short-Term Fund)
            will not pay any initial sales charge on such purchase. However,
            except with regard to purchases of Class A shares of the Money
            Market Fund, purchasers of $1,000,000 ($250,000 in the case of the
            Short-Term Fund) or more of Class A shares (other than those
            purchasers described below un-der "Sales at Net Asset Value" where
            no commission is paid) will be subject to a CDSC of 1% if such
            shares are redeemed during the first 18 months after such shares are
            purchased unless such pur-chaser is eligible for a waiver of the
            CDSC as described under "Waiver of Contingent Deferred Sales Charge"
            above. See "Class A Deferred Sales Charge" below.     
               
            2. The Distributor will pay a commission to dealers who sell
            amounts of $1,000,000 ($250,000 in the case of the Short-Term Fund)
            or more of Class A shares (or who sell Class A shares at net asset
            value to certain employer-sponsored plans as outlined in "Sales at
            Net Asset Value") of each of the Funds ex-cept for the Money Market
            Fund (for which no payment is made) and the Short-Term Fund,
            according to the following schedule: 0.50% of the first $2,000,000
            and 0.25% of amounts over $2,000,000; and 0.25% of sales of Class A
            shares of the Short-Term Fund in excess of $250,000.     

                                                          
<PAGE>
 
               No initial sales charge applies to purchases of Class A shares
            of the Money Market Fund. However, if a shareholder exchanges
            Class A shares of the Money Market Fund, for which no sales load
            was paid at the time of purchase, for Class A shares of any other
            Fund, the sales charge shown above for the other Fund applies at
            the time of the exchange.
               Each Fund receives the entire net asset value of its Class A
            shares purchased by investors. The Distributor receives the sales
            charge shown above less any applicable discount or commission
            "reallowed" to participating brokers in the amounts indicated in
            the table above. The Distributor may, however, elect to reallow
            the entire sales charge to participating brokers for all sales
            with respect to which orders are placed with the Distributor for
            any particular Fund during a particular period. During such peri-
            ods as may from time to time be designated by the Distributor, the
            Distributor will pay an additional amount of up to 0.50% of the
            purchase price on sales of Class A shares of all or selected Funds
            purchased to each participating broker which obtains purchase or-
            ders in amounts exceeding thresholds established from time to time
            by the Distributor. From time to time, the Distributor, its parent
            and/or its affiliates may make additional payments to one or more
            participating brokers based upon factors such as the level of
            sales or the length of time clients' assets have remained in the
            Trust.
               Shares issued pursuant to the automatic reinvestment of income
            dividends or capital gains distributions are issued at net asset
            value and are not subject to any sales charges.
               Under the circumstances described below, investors may be enti-
            tled to pay reduced sales charges for Class A shares.
 
            COMBINED PURCHASE PRIVILEGE Investors may qualify for a reduced
            sales charge by combining purchases of the Class A shares of one
            or more Funds or series of PIMCO Funds: Multi-Manager Series which
            offer Class A shares (together, "eligible PIMCO Funds") into a
            "single purchase," if the resulting purchase totals at least
            $50,000. The term single purchase refers to: (i) a single purchase
            by an individual, or concurrent purchases, which in the aggregate
            are at least equal to the prescribed amounts, by an individual,
            his or her spouse and their children under the age of 21 years
            purchasing Class A shares of the eligible PIMCO Funds for his, her
            or their own account; (ii) a single purchase by a trustee or other
            fiduciary purchasing shares for a single trust, estate or fidu-
            ciary account although more than one beneficiary is involved; or
            (iii) a single purchase for the employee benefit plans of a single
            employer. For further information, call the Distributor at 800-
            426-0107 or your broker.
 
            CUMULATIVE QUANTITY DISCOUNT (RIGHT OF ACCUMULATION) A purchase of
            additional Class A shares of any eligible PIMCO Fund may qualify
            for a Cumulative Quantity Discount at the rate applicable to the
            discount bracket obtained by adding:
                 (i) the investor's current purchase;
                 (ii) the value (at the close of business on the day of the
                 current purchase) of all Class A shares of any eligible PIMCO
                 Fund (other than the Money Market Fund) held by the investor
                 computed at the maximum offering price; and
                 (iii) the value of all shares described in paragraph (ii)
                 owned by another shareholder eligible to be combined with the
                 investor's purchase into a "single purchase" as defined above
                 under "Combined Purchase Privilege."
            For example, if you owned Class A shares of the Total Return Fund
            worth $25,000 at the current maximum offering price and wished to
            purchase Class A shares of the Global Bond Fund II worth an addi-
            tional $30,000, the sales charge for the $30,000 purchase would be
            at the 4.00% rate applicable to a single $55,000 purchase of
            shares of the Global Bond Fund II, rather than the 4.50% rate.
 
       
<PAGE>
 
 
            LETTER OF INTENT An investor may also obtain a reduced sales
            charge by means of a written Letter of Intent, which expresses an
            intention to invest not less than $50,000 within a period of 13
            months in Class A shares of any eligible PIMCO Fund(s) (other than
            the Money Market Fund). Each purchase of shares under a Letter of
            Intent will be made at the public offering price or prices appli-
            cable at the time of such purchase to a single transaction of the
            dollar amount indicated in the Letter. At the investor's option, a
            Letter of Intent may include purchases of Class A shares of any
            eligible PIMCO Fund (other than the Money Market Fund) made not
            more than 90 days prior to the date the Letter of Intent is
            signed; however, the 13-month period during which the Letter is in
            effect will begin on the date of the earliest purchase to be in-
            cluded and the sales charge on any purchases prior to the Letter
            will not be adjusted.
               
               Investors qualifying for the Combined Purchase Privilege de-
            scribed above may purchase shares of the eligible PIMCO Funds un-
            der a single Letter of Intent. For example, if at the time you
            sign a Letter of Intent to invest at least $100,000 in Class A
            shares of any Fund (other than the Money Market Fund), you and
            your spouse each purchase Class A shares of the Global Bond Fund
            II worth $30,000 (for a total of $60,000), it will only be neces-
            sary to invest a total of $40,000 during the following 13 months
            in Class A shares of any of the Funds (other than the Money Market
            Fund) to qualify for the 3.50% sales charge on the total amount
            being invested (the sales charge applicable to an investment of
            $100,000 in any of the Funds other than Money Market, Short-Term,
            Low Duration, Municipal Bond and StocksPLUS Funds).     
               A Letter of Intent is not a binding obligation to purchase the
            full amount indicated. The minimum initial investment under a Let-
            ter of Intent is 5% of such amount. Shares purchased with the
            first 5% of such amount will be held in escrow (while remaining
            registered in your name) to secure payment of the higher sales
            charge applicable to the shares actually purchased in the event
            the full intended amount is not purchased. If the full amount in-
            dicated is not purchased, a sufficient amount of such escrowed
            shares will be involuntarily redeemed to pay the additional sales
            charge applicable to the amount actually purchased, if necessary.
            Dividends on escrowed shares, whether paid in cash or reinvested
            in additional eligible PIMCO Fund shares, are not subject to es-
            crow. When the full amount indicated has been purchased, the es-
            crow will be released.
               If you wish to enter into a Letter of Intent in conjunction
            with your initial investment in Class A shares of a Fund, you
            should complete the appropriate portion of the Account Application
            included with this Prospectus. If you are a current Class A share-
            holder desiring to do so you can obtain a form of Letter of Intent
            by contacting the Distributor at 800-426-0107 or any broker par-
            ticipating in this program.
 
            REINSTATEMENT PRIVILEGE A Class A shareholder who has caused any
            or all of his shares (other than Money Market Fund shares that
            were not acquired by exchanging Class A shares of another Fund) to
            be redeemed may reinvest all or any portion of the redemption pro-
            ceeds in Class A shares of any eligible PIMCO Fund at net asset
            value without any sales charge, provided that such reinvestment is
            made within 120 calendar days after the redemption or repurchase
            date. Shares are sold to a reinvesting shareholder at the net as-
            set value next determined. See "How Net Asset Value is Deter-
            mined." A reinstatement pursuant to this privilege will not cancel
            the redemption transaction and, consequently, any gain or loss so
            realized may be recognized for federal tax purposes except that no
            loss may be recognized to the extent that the proceeds are rein-
            vested in shares of the same Fund within 30 days. The reinstate-
            ment privilege may be utilized by a shareholder only once, irre-
            spective of the number of shares redeemed, except that the privi-
            lege may be utilized without limit in connection with transactions
            whose sole purpose is to transfer a shareholder's interest in a
            Fund to his Individual Retirement Account or other qualified re-
            tirement plan account. An investor may exercise the reinstatement
            privilege by written request sent to the Distributor or to the in-
            vestor's broker.
 
                                                            
<PAGE>
 
                
            SALES AT NET ASSET VALUE Each Fund may sell its Class A shares at
            net asset value without a sales charge to (a) current or retired
            officers, trustees, directors or employees of the Trust, the Advisor
            or the Distributor, a parent, brother or sister of any such officer,
            trustee, director or employee or a spouse or child of such person or
            any trust, profit sharing or pension plan for the benefit of any
            such person, (b) current or retired trustees of PIMCO Funds: Multi-
            Manager Series or Cash Accumulation Trust, registered investment
            companies for which PIMCO Advisors L.P., an affiliate of the
            Advisor, acts as investment adviser, (c) current registered repre-
            sentatives and other full-time employees of participating brokers or
            such persons' spouses, (d) trustees or other fiduciaries purchasing
            shares for certain employer sponsored plans that have at least 100
            eligible participants or at least $1 million in total plan assets,
            (e) trustees or other fiduciaries purchasing shares for certain
            employer-sponsored plans, the trustee, fiduciary or administrator
            for which has an agreement with the Distributor with respect to such
            purchases, (f) participants investing through accounts known as
            "wrap accounts" established with brokers or dealers approved by the
            Distributor where such brokers or dealers are paid a single,
            inclusive fee for brokerage and investment management services, (g)
            broker-dealers or registered investment advisers affiliated with
            such broker-dealers with which the Distributor has an agreement for
            the use of PIMCO Funds in particular investment products for which a
            fee is charged, and (h) trust accounts for which trust companies
            affiliated with the Trust or the Advisor serve as trustee. As
            described above, the Distributor will not pay any initial commission
            to dealers upon the sale of Class A shares to the purchasers
            described in this paragraph except for sales to purchasers described
            under (d) or (e) in this paragraph.     
                   
 
            An investor or participating broker must notify the Distributor
            whenever a quantity discount or reduced sales charge is applicable
            to a purchase and must provide the Distributor with sufficient in-
            formation at the time of purchase to verify that each purchase
            qualifies for the privilege or discount. Upon such notification,
            the investor will receive the lowest applicable sales charge. The
            quantity discounts described above may be modified or terminated
            at any time.
               
            CLASS A DEFERRED SALES CHARGE For all Funds except the Money Mar-ket
            Fund, investors who purchase $1,000,000 ($250,000 in the case of the
            Short-Term Fund) or more of Class A shares (and, thus, purchase such
            shares without any initial sales charge) may be subject to a 1% CDSC
            (the "Class A CDSC") if such shares are redeemed within 18 months of
            their purchase. The Class A CDSC does not apply to investors
            purchasing $1,000,000 or more of any Fund's Class A shares ($250,000
            in the case of the Short-Term Fund) if such investors are otherwise
            eligible to purchase Class A shares without any sales charge because
            they are described under "Sales at Net Asset Value" above.     
               For purchases subject to the Class A CDSC, a 1% CDSC will apply
            for any redemption of such Class A shares that occurs within 18
            months of their purchase. No CDSC will be imposed if the shares
            redeemed have been acquired through the reinvestment of dividends
            or capital gains distributions or if the amount redeemed is de-
            rived from increases in the value of the account above the amount
            of purchase payments subject to the CDSC. In determining whether a
            CDSC is payable, it is assumed that Class A shares acquired
            through the reinvestment of dividends and distributions are re-
            deemed first, and thereafter that Class A shares that have been
            held by an investor for the longest period of time are redeemed
            first.
               
               The Class A CDSC does not apply to Class A shares of the Money
            Market Fund but, if Money Market Fund Class A shares are purchased
            in a transaction that, for any other Fund, would be subject to the
            CDSC (i.e., a purchase of $1,000,000 ($250,000 in the case of the
            Short-Term Fund) or more) and are subsequently exchanged for Class A
            shares of any other Fund, a Class A CDSC will apply to the shares of
            the Fund acquired by exchange for a period of 18 months from the
            date of the exchange.     
 
       
<PAGE>
 
               The Class A CDSC is currently waived in connection with certain
            redemptions as described above under "Alternative Purchase Ar-
            rangements--Waiver of Contingent Deferred Sales Charge."
               For more information about the Class A CDSC, call the Distribu-
            tor at 800-426-0107.
 
            PARTICIPATING BROKERS Investment dealers and other financial in-
            termediaries provide varying arrangements for their clients to
            purchase and redeem Fund shares. Some may establish higher minimum
            investment requirements than set forth above. Firms may arrange
            with their clients for other investment or administrative services
            and may independently establish and charge additional amounts to
            their clients for such services, which charges would reduce cli-
            ents' return. Firms also may hold Fund shares in nominee or street
            name as agent for and on behalf of their customers. In such in-
            stances, the Trust's transfer agent will have no information with
            respect to or control over accounts of specific shareholders. Such
            shareholders may obtain access to their accounts and information
            about their accounts only from their broker. In addition, certain
            privileges with respect to the purchase and redemption of shares
            or the reinvestment of dividends may not be available through such
            firms. Some firms may participate in a program allowing them ac-
            cess to their clients' accounts for servicing including, without
            limitation, transfers of registration and dividend payee changes;
            and may perform functions such as generation of confirmation
            statements and disbursement of cash dividends. This Prospectus
            should be read in connection with such firms' material regarding
            their fees and services.
 
DEFERRED    Class B shares are sold at their current net asset value without
SALES       any initial sales charge. The full amount of an investor's pur-
CHARGE      chase payment will be invested in shares of the Fund(s) selected.
ALTER-      A CDSC will be imposed on Class B shares of all Funds if an in-
NATIVE--    vestor redeems an amount which causes the current value of the in-
CLASS B     vestor's account for a Fund to fall below the total dollar amount
SHARES      of purchase payments subject to the CDSC, except that no CDSC is
            imposed if the shares redeemed have been acquired through the re-
            investment of dividends or capital gains distributions or if the
            amount redeemed is derived from increases in the value of the ac-
            count above the amount of purchase payments subject to the CDSC.
               Class B shares of the Short-Term Fund and the Money Market Fund
            are not offered for initial purchase but may be obtained through
            exchanges of Class B shares of other Funds. See "Exchange Privi-
            lege" below. Class B shares are not available for purchase by em-
            ployer sponsored retirement plans.
               Whether a CDSC is imposed and the amount of the CDSC will de-
            pend on the number of years since the investor made a purchase
            payment from which an amount is being redeemed. Purchases are sub-
            ject to the CDSC according to the following schedule:
 
 
<TABLE>
<CAPTION>
           YEAR SINCE PURCHASE   CONTINGENT
           PAYMENT WAS MADE      DEFERRED SALES CHARGE
           -------------------------------------------
           <S>                   <C>
           First                   5%
           -------------------------------------------
           Second                  4
           -------------------------------------------
           Third                   3
           -------------------------------------------
           Fourth                  3
           -------------------------------------------
           Fifth                   2
           -------------------------------------------
           Sixth                   1
           -------------------------------------------
           Seventh                 0*
</TABLE>
 
            *After the seventh year,
            Class B shares convert into
            Class A shares as described
            below.

                                                           
<PAGE>
 
 
               In determining whether a CDSC is payable, it is assumed that
            the purchase payment from which a redemption is made is the earli-
            est purchase payment from which a redemption or exchange has not
            already been fully effected.
               The following example will illustrate the operation of the
            Class B CDSC:
                   Assume that an individual opens an account and makes a pur-
                chase payment of $10,000 for Class B shares of a Fund (except
                the Money Market and Short-Term Funds) and that six months
                later the value of the investor's account for that Fund has
                grown through investment performance and reinvestment of dis-
                tributions to $11,000. The investor then may redeem up to
                $1,000 from that Fund ($11,000 minus $10,000) without incur-
                ring a CDSC. If the investor should redeem $3,000, a CDSC
                would be imposed on $2,000 of the redemption (the amount by
                which the investor's account for the Fund was reduced below
                the amount of the purchase payment). At the rate of 5%, the
                Class B CDSC would be $100.
               In determining whether an amount is available for redemption
            without incurring a CDSC, the purchase payments made for all Class
            B shares in the shareholder's account with the particular Fund are
            aggregated, and the current value of all such shares is aggregat-
            ed. Any CDSC imposed on a redemption of Class B shares is paid to
            the Distributor.
               Class B shares are subject to higher distribution fees than
            Class A shares for a fixed period after their purchase, after
            which they automatically convert to Class A shares and are no
            longer subject to such higher distribution fees. Class B shares of
            each Fund automatically convert into Class A shares after they
            have been held for seven years.
               For sales of Class B shares made and services rendered to Class
            B shareholders, the Distributor intends to make payments to par-
            ticipating brokers, at the time a shareholder purchases Class B
            shares, of 4% of the purchase amount for each of the Funds. During
            such periods as may from time to time be designated by the Dis-
            tributor, the Distributor will pay selected participating brokers
            an additional amount of up to .50% of the purchase price on sales
            of Class B shares of all or selected Funds purchased to each par-
            ticipating broker which obtains purchase orders in amounts exceed-
            ing thresholds established from time to time by the Distributor.
               The Class B CDSC is currently waived in connection with certain
            redemptions as described above under "Alternative Purchase Ar-
            rangements--Waiver of Contingent Deferred Sales Charges."
               For more information about the Class B CDSC, call the Distribu-
            tor at 800-426-0107.
 
ASSET BASED Class C shares are sold at their current net asset value without
SALES       any initial sales charge. A CDSC is imposed on Class C shares of
CHARGE      all Funds if an investor redeems an amount which causes the cur-
ALTERNA-    rent value of the investor's account for a Fund to fall below the
TIVE--CLASS total dollar amount of purchase payments subject to the CDSC, ex-
C SHARES    cept that no CDSC is imposed if the shares redeemed have been ac-
            quired through the reinvestment of dividends or capital gains dis-
            tributions or if the amount redeemed is derived from increases in
            the value of the account above the amount of purchase payments
            subject to the CDSC. All of an investor's purchase payments are
            invested in shares of the Fund(s) selected.
               Whether a CDSC is imposed and the amount of the CDSC will de-
            pend on the number of years since the investor made a purchase
            payment from which an amount is being redeemed. Purchases are sub-
            ject to the CDSC according to the following schedule:
 
<TABLE>
<CAPTION>
           YEAR SINCE PURCHASE   PERCENTAGE CONTINGENT
           PAYMENT WAS MADE      DEFERRED SALES CHARGE
              ----------------------------------------
           <S>                   <C>
           First                   1
              ----------------------------------------
           Thereafter              0
</TABLE>
               In determining whether a CDSC is payable, it is assumed that
            the purchase payment from which the redemption is made is the ear-
            liest purchase payment (from which a redemption or exchange has
            not already been effected).
 
       
<PAGE>
 
               The following example will illustrate the operation of the
            Class C CDSC:
                   Assume that an individual opens an account and makes a pur-
                chase payment of $10,000 for Class C shares of a Fund and that
                six months later the value of the investor's account for that
                Fund has grown through investment performance and reinvestment
                of distributions to $11,000. The investor then may redeem up
                to $1,000 from that Fund ($11,000 minus $10,000) without in-
                curring a CDSC. If the investor should redeem $3,000, a CDSC
                would be imposed on $2,000 of the redemption (the amount by
                which the investor's account for the Fund was reduced below
                the amount of the purchase payment). At the rate of 1%, the
                Class C CDSC would be $20.
               In determining whether an amount is available for redemption
            without incurring a CDSC, the purchase payments made for all Class
            C shares in the shareholder's account with the particular Fund are
            aggregated, and the current value of all such shares is aggregat-
            ed. Any CDSC imposed on a redemption of Class C shares is paid to
            the Distributor. Unlike Class B shares, Class C shares do not au-
            tomatically convert to any other class of shares of the Funds.
                
               Except as described below, for sales of Class C shares made and
            services rendered to Class C shareholders, the Distributor expects
            to make payments to participating brokers, at the time the share-
            holder purchases Class C shares, of 1.00% (representing .75% dis-
            tribution fees and .25% servicing fees) of the purchase amount for
            all Funds except the Real Return Bond, Municipal Bond, StocksPLUS,
            Low Duration, Low Duration Mortgage, Short-Term and Money Market
            Funds. For the Real Return Bond, Municipal Bond, StocksPLUS, Low
            Duration and Low Duration Mort-gage Funds, the Distributor expects
            to make payments of .75% (rep-resenting .50% distribution fees and
            .25% service fees); for the Short-Term Fund, the Distributor expects
            to make payments of .55% (representing .30% distribution fees and
            .25% service fees); and for the Money Market Fund, the Distributor
            expects to make no pay-ment. For sales of Class C shares made to
            participants making pe-riodic purchases of not less than $50 through
            certain employer sponsored savings plans which are clients of a
            broker-dealer with which the Distributor has an agreement with
            respect to such pur-chases, no payments are made at the time of
            purchase. During such periods as may from time to time be designated
            by the Distributor, the Distributor will pay an additional amount of
            up to .50% of the purchase price on sales of Class C shares of all
            or selected Funds purchased to each participating broker which
            obtains purchase or-ders in amounts exceeding thresholds established
            from time to time by the Distributor.       
               The Class C CDSC is currently waived in connection with certain
            redemptions as described above under "Alternative Purchase Ar-
            rangements--Waiver of Contingent Deferred Sales Charges."
               For more information about the Class C CDSC, contact the Dis-
            tributor at 800-426-0107.
 
            Exchange Privilege
 
            A shareholder may exchange Class A, Class B and Class C shares of
            any Fund for the same Class of shares of any other Fund in an ac-
            count with identical registration on the basis of their respective
            net asset values (except that a sales charge will apply on ex-
            changes of Class A shares of the Money Market Fund on which no
            sales load was paid at the time of purchase). Class A, Class B and
            Class C shares of each Fund may also be exchanged for shares of
            the same Class of a series which offers such classes (except for
            the Opportunity Fund if a restriction applies) of PIMCO Funds:
            Multi-Manager Series, an affiliated mutual fund family comprised
            primarily of equity portfolios managed by the subsidiary partner-
            ships of PIMCO Advisors L.P. Class A shares of the Money Market
            Fund may be exchanged for Class A shares of any other Fund, but
            the usual sales charges applicable to investments in such other
            Fund apply on shares for which no sales load was paid at the time
            of purchase. There are currently no exchange fees or charges. Ex-
            cept with respect to tax- qualified programs and exchanges ef-
            fected through the PIMCO Auto Exchange plan, exchanges are subject
            to the $250 minimum initial purchase requirement for each Fund. An
            exchange will constitute a taxable sale for federal income tax
            purposes.
                
               Investors who maintain their account with the Distributor may
            exchange shares by a written exchange request sent to PIMCO Funds
            Distributors LLC, P.O. Box 5866, Denver, CO 80217-5866 or, un-
            less the investor has specifically declined telephone exchange
            privileges on the Account Application or elected in writing not to
            utilize       

         
<PAGE>
 
               
            telephone exchanges, by a telephone request to the Transfer Agent
            at 800-426-0107. The Trust will employ reasonable procedures to
            confirm that instructions communicated by telephone are genuine,
            and may be liable for any losses due to unauthorized or fraudulent
            instructions if it fails to employ such procedures. The Trust will
            require a form of personal identification prior to acting on a
            caller's telephone instructions, will provide written confirma-
            tions of such transactions and will record telephone instructions.
            Exchange forms are available from the Distributor at 800-426-0107
            and may be used if there will be no change in the registered name
            or address of the shareholder. Changes in registration information
            or account privileges may be made in writing to the Transfer
            Agent, Shareholder Services, Inc., P.O. Box 5866, Denver, Colorado
            80217-5866, or by use of forms which are available from the Dis-
            tributor. A signature guarantee is required. See "How to Buy
            Shares--Signature Guarantee." Telephone exchanges may be made be-
            tween 9:00 a.m. Eastern time and the close of regular trading
            (normally 4:00 p.m. Eastern time) on the Exchange on any day the
            Exchange is open (generally weekdays other than normal holidays).
            The Trust reserves the right to refuse exchange purchases if, in
            the judgment of the Advisor, the purchase would adversely affect
            the Fund and its shareholders. In particular, a pattern of ex-
            changes characteristic of "market-timing" strategies may be deemed
            by the Advisor to be detrimental to the Trust or a particular Fund.
            Currently, the Trust limits the number of "round trip" exchanges an
            investor may make. An investor makes a "round trip" exchange when
            the investor purchases shares of a particular Fund, subsequently
            exchanges these shares for shares of a different Fund and then
            exchanges back into the originally purchased Fund. The Trust has the
            right to refuse any exchange for any investor who completes (by
            making the exchange back into the shares of the originally purchased
            Fund) more than six round trip exchanges in any twelve-month period.
            Although the Trust has no current intention of terminating or
            modifying the exchange privilege other than as set forth in the
            preceding sentence, it reserves the right to do so at any time.
            Except as otherwise permitted by Securities and Exchange Commission
            regulations, the Trust will give 60 days' ad-vance notice to
            shareholders of any termination or material modi-fication of the
            exchange privilege. For further information about exchange
            privileges, contact your participating broker or call the Transfer
            Agent at 800-426-0107.     
               With respect to Class B and Class C shares, or Class A shares
            subject to a CDSC, if less than all of an investment is exchanged
            out of a Fund, any portion of the investment attributable to capi-
            tal appreciation and/or reinvested dividends or capital gains dis-
            tributions will be exchanged first, and thereafter any portions
            exchanged will be from the earliest investment made in the Fund
            from which the exchange was made. Shareholders should take into
            account the effect of any exchange on the applicability of any
            CDSC that may be imposed upon any subsequent redemption. Although
            the Class A CDSC does not apply to Class A shares of the Money
            Market Fund, Class A shares purchased in a transaction that would
            otherwise be subject to the Class A CDSC (i.e., most purchases of
            $1,000,000 or more) are subsequently exchanged for Class A shares
            of any other Fund, a Class A CDSC will apply to the shares of the
            Fund acquired by exchange for a period of 18 months from the date
            of the exchange. See "Initial Sales Charge Alternative--Class A
            Shares--Class A Deferred Sales Charge" above.
     
            Investors may also select the PIMCO Auto Exchange plan which es-
            tablishes automatic periodic exchanges. For further information on
            automatic exchanges see "How to Buy Shares--PIMCO Auto Exchange"
            above.     
 
            How to Redeem
 
            Class A, Class B or Class C shares may be redeemed through a par-
            ticipating broker, by telephone, by submitting a written redemp-
            tion request directly to the Transfer Agent (for non-broker ac-
            counts), or through an Automatic Withdrawal Plan or PIMCO Fund
            Link.
               A CDSC may apply to a redemption of Class A, Class B or Class C
            shares. See "Alternative Purchase Arrangements" above. Shares are
            redeemed at their net asset value next determined after a proper
            redemption request has been received, less any applicable CDSC. In
            order to discourage short-term trading, the StocksPLUS Short
            Strategy Fund imposes a redemption fee, payable to the Fund, of 1%
            on all shares of the Fund held for less than three months, which
 
         
<PAGE>
 
            is in addition to any CDSC that may be payable to the Distributor
            in respect of Class A, Class B or Class C shares. There is no
            charge by the Distributor (other than an applicable CDSC) with re-
            spect to a redemption; however, a participating broker who
            processes a redemption for an investor may charge customary com-
            missions for its services. Dealers and other financial services
            firms are obligated to transmit orders promptly. Requests for re-
            demption received by dealers or other firms prior to the close of
            regular trading (normally 4:00 p.m. Eastern time) on the Exchange
            on a regular business day and received by the Distributor prior to
            the close of the Distributor's business day will be confirmed at
            the net asset value effective as of the closing of the Exchange on
            that day, less any applicable CDSC.
     
DIRECT      A shareholder's original Account Application permits the share-
REDEMPTION  holder to redeem by written request and by telephone (unless the
            shareholder specifically elects not to utilize telephone redemp-
            tions) and to elect one or more of the additional redemption pro-
            cedures described below. A shareholder may change the instructions
            indicated on his original Account Application, or may request ad-
            ditional redemption options, only by transmitting a written direc-
            tion to the Transfer Agent. Requests to institute or change any of
            the additional redemption procedures will require a signature
            guarantee.     
               Redemption proceeds will normally be mailed to the redeeming
            shareholder within seven days or, in the case of wire transfer or
            Fund Link redemptions, sent to the designated bank account within
            one business day. Fund Link redemptions may be received by the
            bank on the second or third business day. In cases where shares
            have recently been purchased by personal check, redemption pro-
            ceeds may be withheld until the check has been collected, which
            may take up to 15 days. To avoid such withholding, investors
            should purchase shares by certified or bank check or by wire
            transfer.
     
WRITTEN     To redeem shares in writing (whether or not represented by certif-
REQUESTS    icates), a shareholder must send the following items to the Trans-
            fer Agent, Shareholder Services, Inc., P.O. Box 5866, Denver, Col-
            orado 80217-5866: (1) a written request for redemption signed by
            all registered owners exactly as the account is registered on the
            Transfer Agent's records, including fiduciary titles, if any, and
            specifying the account number and the dollar amount or number of
            shares to be redeemed; (2) for certain redemptions described be-
            low, a guarantee of all signatures on the written request or on
            the share certificate or accompanying stock power, if required, as
            described under "How to Buy Shares--Signature Guarantee"; (3) any
            share certificates issued for any of the shares to be redeemed
            (see "Certificated Shares" below); and (4) any additional docu-
            ments which may be required by the Transfer Agent for redemption
            by corporations, partnerships or other organizations, executors,
            administrators, trustees, custodians or guardians, or if the re-
            demption is requested by anyone other than the shareholder(s) of
            record. Transfers of shares are subject to the same requirements.
            A signature guarantee is not required for redemptions of $50,000
            or less, requested by and payable to all shareholders of record
            for the account, to be sent to the address of record for that ac-
            count. To avoid delay in redemption or transfer, shareholders hav-
            ing any questions about these requirements should contact the
            Transfer Agent in writing or by calling 1-800-426-0107 before sub-
            mitting a request. Redemption or transfer requests will not be
            honored until all required documents in the proper form have been
            received by the Transfer Agent. This redemption option does not
            apply to shares held in broker "street name" accounts.     
               If the proceeds of the redemption (i) exceed $50,000, (ii) are
            to be paid to a person other than the record owner, (iii) are to
            be sent to an address other than the address of the account on the
            Transfer Agent's records, or (iv) are to be paid to a corporation,
            partnership, trust or fiduciary, the signature(s) on the redemp-
            tion request and on the certificates, if any, or stock power must
            be guaranteed as described above, except that the Distributor may
            waive the signature guarantee requirement for redemptions up to
            $2,500 by a trustee of a qualified retirement plan, the adminis-
            trator for which has an agreement with the Distributor.

         
<PAGE>
 
     
TELEPHONE   The Trust accepts telephone requests for redemption of shares for
REDEMPTIONS amounts up to $50,000 within any 7 calendar day period, except for
            investors who have specifically declined telephone redemption
            privileges on the Account Application or elected in writing not to
            utilize telephone redemptions. The proceeds of a telephone redemp-
            tion will be sent to the record shareholder at his record address.
            Changes in account information must be made in a written authori-
            zation with a signature guarantee. See "How to Buy Shares--Signa-
            ture Guarantee". Telephone redemptions will not be accepted during
            the 30-day period following any change in an account's record ad-
            dress. This redemption option does not apply to shares held in
            broker "street name" accounts.     
               By completing an Account Application, an investor agrees that
            the Trust, the Distributor and the Transfer Agent shall not be li-
            able for any loss incurred by the investor by reason of the Trust
            accepting unauthorized telephone redemption requests for his ac-
            count if the Trust reasonably believes the instructions to be gen-
            uine. Thus, shareholders risk possible losses in the event of a
            telephone redemption not authorized by them. The Trust may accept
            telephone redemption instructions from any person identifying him-
            self as the owner of an account or the owner's broker where the
            owner has not declined in writing to utilize this service. The
            Trust will employ reasonable procedures to confirm that instruc-
            tions communicated by telephone are genuine, and may be liable for
            any losses due to unauthorized or fraudulent instructions if it
            fails to employ such procedures. The Trust will require a form of
            personal identification prior to acting on a caller's telephone
            instructions, will provide written confirmations of such transac-
            tions and will record telephone instructions.
                
               A shareholder making a telephone redemption should call the
            Transfer Agent at 800-426-0107 and state (i) the name of the
            shareholder as it appears on the Transfer Agent's records, (ii)
            his account number with the Trust, (iii) the amount to be with-
            drawn and (iv) the name of the person requesting the redemption.
            Usually the proceeds are sent to the investor on the next Trust
            business day after the redemption is effected, provided the re-
            demption request is received prior to the close of regular trading
            (normally 4:00 p.m. Eastern time) on the Exchange that day. If the
            redemption request is received after the close of the Exchange,
            the redemption is effected on the following Trust business day at
            that day's net asset value and the proceeds are usually sent to
            the investor on the second following Trust business day. The Trust
            reserves the right to terminate or modify the telephone redemption
            service at any time. During times of severe disruptions in the se-
            curities markets, the volume of calls may make it difficult to re-
            deem by telephone, in which case a shareholder may wish to send a
            written request for redemption as described under "Written Re-
            quests" above. Telephone communications may be recorded by the
            Distributor or the Transfer Agent.     

     
FUND LINK   If a shareholder has established Fund Link, the shareholder may
REDEMPTIONS redeem shares by telephone and have the redemption proceeds sent
            to a designated account at a financial institution. Fund Link is
            normally established within 45 days of receipt of a Fund Link Ap-
            plication by the Transfer Agent. To use Fund Link for redemptions,
            call the Transfer Agent at 800-426-0107. Subject to the limita-
            tions set forth above under "Telephone Redemptions," the Distribu-
            tor, the Trust and the Transfer Agent may rely on instructions by
            any registered owner believed to be genuine and will not be re-
            sponsible to any shareholder for any loss, damage or expense aris-
            ing out of such instructions. Requests received by the Transfer
            Agent prior to the close of regular trading (normally 4:00 p.m.
            Eastern time) on the Exchange on a business day will be processed
            at the net asset value on that day and the proceeds (less any
            CDSC) will normally be sent to the designated bank account on the
            following business day and received by the bank on the second or
            third business day. If the redemption request is received after
            the close of regular trading on the Exchange, the redemption is
            effected on the following business day. Shares purchased by check
            may not be redeemed through Fund Link until such shares have been
            owned (i.e., paid for) for at least 15 days. Fund Link may not be
            used to redeem shares held in certificated form. Changes in bank
            account information must be made by completing a new Fund Link Ap-
            plication, signed by all owners of record of the account,     
 
         
<PAGE>
 
             with all signatures guaranteed. See "How to Buy Shares--Signature 
             Guarantee." See "How to Buy Shares-- PIMCO Fund Link" for informa-
             tion on establishing the Fund Link privilege. The Trust may termi-
             nate the Fund Link program at any time without notice to share-   
             holders. This redemption option does not apply to shares held in  
             broker "street name" accounts.                                     
         
PIMCO FUNDS  PIMCO Funds Automated Telephone System ("ATS") is an automated
AUTOMATED    telephone system that enables shareholders to perform a number of
TELEPHONE    account transactions automatically using a touch-tone telephone.
SYSTEM       ATS may be used on already-established Fund accounts after you ob-
             tain a Personal Identification Number (PIN) by calling the special
             ATS number: 1-800-223-2413.
             PURCHASING SHARES. You may purchase shares in amounts up to
             $100,000 by telephone by calling 1-800-223-2413. You must have es-
             tablished ATS privileges to link your bank account with the Fund
             to pay for these purchases.
             EXCHANGING SHARES. With the PIMCO Funds Exchange Privilege, you
             can exchange shares automatically by telephone from your Fund Link
             Account to another PIMCO Funds account you have already estab-
             lished by calling 1-800-223-2413. Please refer to "Exchange Privi-
             lege" below for details.      

EXPEDITED    If a shareholder has given authorization for expedited wire re-    
WIRE         demption, shares can be redeemed and the proceeds sent by federal  
TRANSFER     wire transfer to a single previously designated bank account. Re-  
REDEMPTIONS  quests received by the Trust prior to the close of the Exchange    
             will result in shares being redeemed that day at the next deter-   
             mined net asset value (less any CDSC) and normally the proceeds    
             being sent to the designated bank account the following business   
             day. The bank must be a member of the Federal Reserve wire system. 
             Delivery of the proceeds of a wire redemption request may be de-   
             layed by the Trust for up to 7 days if the Distributor deems it    
             appropriate under then current market conditions. Once authoriza-  
             tion is on file, the Trust will honor requests by any person iden- 
             tifying himself as the owner of an account or the owner's broker   
             by telephone at 800-426-0107 or by written instructions. The Trust 
             cannot be responsible for the efficiency of the Federal Reserve    
             wire system or the shareholder's bank. The Trust does not cur-     
             rently charge for wire transfers. The shareholder is responsible   
             for any charges imposed by the shareholder's bank. The minimum     
             amount that may be wired is $2,500. The Trust reserves the right   
             to change this minimum or to terminate the wire redemption privi-  
             lege. Shares purchased by check may not be redeemed by wire trans- 
             fer until such shares have been owned (i.e., paid for) for at      
             least 15 days. Expedited wire transfer redemptions may be autho-   
             rized by completing a form available from the Distributor. Wire    
             redemptions may not be used to redeem shares in certificated form. 
             To change the name of the single bank account designated to re-    
             ceive wire redemption proceeds, it is necessary to send a written  
             request with signatures guaranteed to PIMCO Funds Distribution     
             Company, P.O. Box 5866, Denver, CO 80217-5866. See "How to Buy     
             Shares -- Signature Guarantee." This redemption option does not    
             apply to shares held in broker "street name" accounts.     
     
CERTIFICATED To redeem shares for which certificates have been issued, the cer-
SHARES       tificates must be mailed to or deposited with the Trust, duly en- 
             dorsed or accompanied by a duly endorsed stock power or by a writ-
             ten request for redemption. Signatures must be guaranteed as de-  
             scribed under "How to Buy Shares--Signature Guarantee." Further   
             documentation may be requested from institutions or fiduciary ac- 
             counts, such as corporations, custodians (e.g., under the Uniform 
             Gifts to Minors Act), executors, administrators, trustees or      
             guardians ("institutional account owners"). The redemption request
             and stock power must be signed exactly as the account is regis-   
             tered, including indication of any special capacity of the regis- 
             tered owner.     

     
AUTOMATIC    An investor who owns or buys shares of a Fund having a net asset  
WITHDRAWAL   value of $10,000 or more may open an Automatic Withdrawal Plan and
PLAN         have a designated sum of money (not less than $100 per Fund) paid 
             monthly (or quarterly) to the investor or another person. Such a  
             plan may be established by completing the appropriate section of  
             the Account Application or you may obtain an Automatic Withdrawal 
             Plan Application from the Distributor or your broker. If an Auto- 
             matic Withdrawal Plan is set up after the account is established  
             providing for payment to a person other than the record share-    
             holder or to an address other than the address of record, a signa-
             ture guarantee is required. See "How to Buy Shares--Signature     
             Guarantee." Class A, Class B, and Class C shares of any Fund are  
             deposited in a plan account and all distributions are reinvested  
             in additional shares of that class of the Fund at net asset value.
             Shares in a plan account are then redeemed at net asset value     
             (less any applicable CDSC) to make each withdrawal payment. Any   
             applicable CDSC may be waived for certain redemptions under an Au-
             tomatic Withdrawal Plan. See "Alternative Purchase Arrangements-- 
             Waiver of Contingent Deferred Sales Charges."     
 
         
<PAGE>
 
               Redemptions for the purpose of withdrawals are ordinarily made
            on the business day preceding the day of payment at that day's
            closing net asset value and checks are mailed on the day of pay-
            ment selected by the shareholder. The Transfer Agent may acceler-
            ate the redemption and check mailing date by one day to avoid
            weekend delays. Payment will be made to any person the investor
            designates; however, if the shares are registered in the name of a
            trustee or other fiduciary, payment will be made only to the fidu-
            ciary, except in the case of a profit-sharing or pension plan
            where payment will be made to the designee. As withdrawal payments
            may include a return of principal, they cannot be considered a
            guaranteed annuity or actual yield of income to the investor. The
            redemption of shares in connection with an Automatic Withdrawal
            Plan may result in a gain or loss for tax purposes. Continued
            withdrawals in excess of income will reduce and possibly exhaust
            invested principal, especially in the event of a market decline.
            The maintenance of an Automatic Withdrawal Plan concurrently with
            purchases of additional shares of the Fund would be disadvanta-
            geous to the investor because of the CDSC that may become payable
            on such withdrawals in the case of Class A, Class B or Class C
            shares and because of the initial sales charge in the case of
            Class A shares. For this reason, the minimum investment accepted
            for a Fund while an Automatic Withdrawal Plan is in effect for
            that Fund is $1,000, and an investor may not maintain a plan for
            the accumulation of shares of the Fund (other than through rein-
            vestment of distributions) and an Automatic Withdrawal Plan at the
            same time. The Trust or the Distributor may terminate or change
            the terms of the Automatic Withdrawal Plan at any time.
               Because the Automatic Withdrawal Plan may involve invasion of
            capital, investors should consider carefully with their own finan-
            cial advisers whether the plan and the specified amounts to be
            withdrawn are appropriate in their circumstances. The Trust and
            the Distributor make no recommendations or representations in this
            regard.
 
            Distributor and Distribution and Servicing Plans
                                 
            The Distributor, a wholly owned subsidiary of PIMCO Advisors L.P.,
            is the principal underwriter of the Trust's shares and in that
            connection makes distribution and servicing payments to partici-
            pating brokers and servicing payments to certain banks and other
            financial intermediaries in connection with the sale of Class B
            and Class C shares and servicing payments to participating bro-
            kers, certain banks and other financial intermediaries in connec-
            tion with the sale of Class A shares. In the case of Class A
            shares, these parties are also compensated based on the amount of
            the front-end sales charge reallowed by the Distributor, except in
            cases where Class A shares are sold without a front-end sales
            charge. In the case of Class B shares, participating brokers and
            other financial intermediaries are compensated by an advance of a
            sales commission by the Distributor. In the case of Class C
            shares, part or all of the first year's distribution and servicing
            fee is generally paid at the time of sale. Pursuant to a Distribu-
            tion Contract with the Trust, with respect to each Fund's Class A,
            Class B and Class C shares, the Distributor bears various other
            promotional and sales related expenses, including the cost of
            printing and mailing prospectuses to persons other than current
            shareholders. The Distributor, located at 2187 Atlantic Street,
            Stamford, Connecticut 06902, is a broker-dealer registered with the
            Securities and Exchange Commission.       





  
 
         
<PAGE>
 
            CLASS A SERVICING FEES As compensation for services rendered and
            expenses borne by the Distributor in connection with personal
            services rendered to Class A shareholders of the Trust and the
            maintenance of Class A shareholder accounts, the Trust pays the
            Distributor servicing fees up to the annual rates set forth below
            (calculated as a percentage of each Fund's average daily net as-
            sets attributable to Class A shares):
<TABLE>
<CAPTION>
                                  SERVICING
           FUND                   FEE
              -----------------------------
           <S>                    <C>
           All Funds except the
            Money Market Fund     .25%
              -----------------------------
           Money Market Fund*     .10%
</TABLE>
            *Subject to increase by action of the Trust's Trustees to a rate
            not exceeding .25% per annum. Also, subject to increase to a rate
            not exceeding 0.20% if the Distributor ceases to voluntarily waive
            any portion of the fee.
 
            CLASS B DISTRIBUTION AND SERVICING FEES As compensation for serv-
            ices rendered and expenses borne by the Distributor in connection
            with the distribution of Class B shares of the Trust and, in con-
            nection with personal services rendered to Class B shareholders of
            the Trust and the maintenance of Class B shareholder accounts, the
            Trust pays the Distributor servicing fees and distribution fees up
            to the annual rates set forth below (calculated as a percentage of
            each Fund's average daily net assets attributable to Class B
            shares):
 
<TABLE>
<CAPTION>
                      SERVICING DISTRIBUTION
           FUND       FEE       FEE
              ------------------------------
           <S>        <C>       <C>
           All Funds  .25%      .75%
</TABLE>
 
            CLASS C DISTRIBUTION AND SERVICING FEES As compensation for serv-
            ices rendered and expenses borne by the Distributor in connection
            with the distribution of Class C shares of the Trust and, in con-
            nection with personal services rendered to Class C shareholders of
            the Trust and the maintenance of Class C shareholder accounts, the
            Trust pays the Distributor servicing fees and distribution fees up
            to the annual rates set forth below (calculated as a percentage of
            each Fund's average daily net assets attributable to Class C
            shares):
  
<TABLE>     
<CAPTION>
                             SERVICING DISTRIBUTION
           FUND              FEE       FEE
              -------------------------------------
           <S>               <C>       <C>
           All Funds except
            the StocksPlus,
            Real Return
            Bond, Low
            Duration
            Mortgage, Low
            Duration,
            Short-Term and
            Money Market
            Funds            .25%      .75%
              -------------------------------------
           StocksPLUS, Real
            Return Bond,
            Municipal Bond,
            Low Duration
            Mortgage and
            Low Duration
            Funds*           .25%      .50%
              -------------------------------------
           Short-Term Fund*  .25%      .30%
              -------------------------------------
           Money Market
            Fund*            .10%      .00%
</TABLE>       
                 
            *Subject to increase by action of the Trust's Trustees to a rate
            not exceeding .75% per annum with respect to the distribution fee
            on shares of the Low Duration and Money Market Funds, and .25% per
            annum with respect to the servicing fee on shares of the Money
            Market Fund. With respect to the servicing fee on shares of the
            Money Market Fund, such fee is subject to increase to a rate of
            .20% if the Distributor ceases to voluntarily waive any portion of
            the fee. With respect to the distribution fee on shares of each of
            the StocksPLUS, Real Return Bond, Municipal Bond and Short-Term
            Funds, such fee is subject to an in-crease to a rate of .75% if the
            Distributor ceases to voluntarily waive any portion of the fee.     
         
<PAGE>
 
 
               The Class A servicing fees and Class B and Class C distribution
            and servicing fees paid to the Distributor are made under Distri-
            bution and Servicing Plans adopted pursuant to Rule 12b-l under
            the Investment Company Act of 1940 and are of the type known as
            "compensation" plans. This means that, although the Trustees of
            the Trust are expected to take into account the expenses of the
            Distributor and its predecessors in their periodic review of the
            Distribution and Servicing Plans, the fees are payable to compen-
            sate the Distributor for services rendered even if the amount paid
            exceeds the Distributor's expenses.
               The distribution fee applicable to Class B and Class C shares
            may be spent by the Distributor on any activities or expenses pri-
            marily intended to result in the sale of Class B or Class C
            shares, respectively, including compensation to, and expenses (in-
            cluding overhead and telephone expenses) of, financial consultants
            or other employees of the Distributor or of participating or in-
            troducing brokers who engage in distribution of Class B or Class C
            shares, printing of prospectuses and reports for other than exist-
            ing Class B or Class C shareholders, advertising, and preparation,
            printing and distribution of sales literature. The servicing fee,
            applicable to Class A, Class B and Class C shares of the Trust,
            may be spent by the Distributor on personal services rendered to
            shareholders of the Trust and the maintenance of shareholder ac-
            counts, including compensation to, and expenses (including tele-
            phone and overhead expenses) of, financial consultants or other
            employees of participating or introducing brokers, certain banks
            and other financial intermediaries who aid in the processing of
            purchase or redemption requests or the processing of dividend pay-
            ments, who provide information periodically to shareholders show-
            ing their positions in a Fund's shares, who forward communications
            from the Trust to shareholders, who render ongoing advice concern-
            ing the suitability of particular investment opportunities offered
            by the Trust in light of the shareholders' needs, who respond to
            inquiries from shareholders relating to such services, or who
            train personnel in the provision of such services. Distribution
            and servicing fees may also be spent on interest relating to
            unreimbursed distribution or servicing expenses from prior years.
               Many of the Distributor's sales and servicing efforts involve
            the Trust as a whole, so that fees paid by Class A, Class B or
            Class C shares of any Fund may indirectly support sales and ser-
            vicing efforts relating to the other Funds' shares of the same
            class. In reporting its expenses to the Trustees, the Distributor
            itemizes expenses that relate to the distribution and/or servicing
            of a single Fund's shares, and allocates other expenses among the
            Funds based on their relative net assets. Expenses allocated to
            each Fund are further allocated among its classes of shares annu-
            ally based on the relative sales of each class, except for any ex-
            penses that relate only to the sale or servicing of a single
            class. The Distributor may make payments to brokers (and with re-
            spect to servicing fees only, to certain banks and other financial
            intermediaries) of up to the following percentages annually of the
            average daily net assets attributable to shares in the accounts of
            their customers or clients:

<TABLE>    
<CAPTION>
            CLASS A SHARES
                                                      SERVICING
                                                      FEE(1)
           ----------------------------------------------------
           <S>                                        <C>
           All Funds except the Money Market Fund     .25%
           ----------------------------------------------------
           Money Market Fund                          .10%

           CLASS B SHARES(2)
                                                      SERVICING
                                                      FEE(1)
           ----------------------------------------------------
           All Funds                                  .25%
</TABLE>     
 
         
<PAGE>
 
                  
              CLASS C SHARES--
              PURCHASED ON OR AFTER
              7/1/91(3)     
 
<TABLE>        
<CAPTION>
                             SERVICING DISTRIBUTION
                             FEE(1)    FEE(1)
           ----------------------------------------
<S>                          <C>       <C>
           All Funds except
            the StocksPLUS,
            Real Return
            Bond, Low Dura-
            tion Mortgage,
            Low Duration,
            Short-Term and
            Money Market
            Funds            .25%      .65%
           ----------------------------------------
           StocksPLUS, Real
            Return Bond, 
            Municipal Bond,
            Low Duration
            Mortgage and
            Low Duration
            Funds            .25%      .45%
           ----------------------------------------
           Short-Term Fund   .25%      .25%
           ----------------------------------------
           Money Market
            Fund             .10%      .00%
</TABLE>          
 
 
 
              CLASS C SHARES--
              PURCHASED BEFORE 7/1/91     
 
<TABLE>    
<CAPTION>
                                  SERVICING
                                  FEE(1)
           --------------------------------
<S>                               <C>
           All Funds except the
            Money Market Fund     .25%
           --------------------------------
           Money Market Fund      .10%
</TABLE>     
                
            (1) Applies, in part, to Class A, Class B and Class C shares of
                the Trust issued to former shareholders of PIMCO Advisors
                Funds in connection with the reorganizations/mergers of series
                of PIMCO Advisors Funds as/with Funds of the Trust in a trans-
                action which took place on January 17, 1997.     
                
            (2) Payable only with respect to shares outstanding for one year
                or more.     
                
            (3) Payable only with respect to shares outstanding for one year
                or more except in the case of shares for which no payment is
                made to the party at the time of sale.     
 
               The Distributor may from time to time pay additional cash bo-
            nuses or other incentives to selected participating brokers in
            connection with the sale or servicing of Class A, Class B and
            Class C shares of the Funds. On some occasions, such bonuses or
            incentives may be conditioned upon the sale of a specified minimum
            dollar amount of the shares of a Fund and/or all of the Funds to-
            gether or a particular class of shares, during a specific period
            of time. The Distributor currently expects that such additional
            bonuses or incentives will not exceed .50% of the amount of any
            sale. Pacific Investment Management (in its capacity as adminis-
            trator) may also pay participating brokers and other intermediar-
            ies for transfer agency and other services.
               If in any year the Distributor's expenses incurred in connec-
            tion with the distribution of Class B and Class C shares and, for
            Class A, Class B and Class C Shares, in connection with the ser-
            vicing of shareholders and the maintenance of shareholder ac-
            counts, exceed the distribution and/or servicing fees paid by the
            Trust, the Distributor would recover such excess only if the Dis-
            tribution and Servicing Plan with respect to such class of shares
            continues to be in effect in some later year when the distribution
            and/or servicing fees exceed the Distributor's expenses. The Trust
            is not obligated to repay any unreimbursed expenses that may exist
            at such time, if any, as the relevant Distribution and Servicing
            Plan terminates.
                
               From time to time, expenses of principal underwriters incurred in
            connection with the sale of shares of the Funds and in connection
            with the servicing of shareholders of the Funds and the maintenance
            of shareholder accounts may exceed the distribution and servicing
            fees collected by the Distributor. As of March 31, 1998, such
            expenses were approximately $2,927,000 in excess of payments under
            the Funds' Class A Distribution and Servicing Plan, $12,538,000 in
            excess of payments under the Funds' Class B Distribution and
            Servicing Plan, and $220,000 in excess of payments under the Funds'
            Class C Distribution and Servicing Plan.      

         
<PAGE>
 
        
            How Net Asset Value Is Determined
                 
            The net asset values of Class A, Class B and Class C shares of each
            Fund will be determined on each day the Exchange is open as of the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            Exchange. Net asset value will not be determined on days on which
            the Exchange is closed.      
               The Money Market Fund's securities are normally valued using
            the amortized cost method of valuation. This involves valuing a
            security at cost on the date of acquisition and thereafter assum-
            ing a constant accretion of a discount or amortization of a pre-
            mium to maturity. See the Statement of Additional Information for
            a description of certain conditions and procedures followed by the
            Money Market Fund in connection with amortized cost valuation. For
            all other Funds, portfolio securities and other assets for which
            market quotations are readily available are stated at market val-
            ue. Market value is determined on the basis of last reported sales
            prices, or if no sales are reported, as is the case for most secu-
            rities traded over-the-counter, at the mean between representative
            bid and asked quotations obtained from a quotation reporting sys-
            tem or from established market makers. Fixed income securities,
            including those to be purchased under firm commitment agreements
            (other than obligations having a maturity of 60 days or less), are
            normally valued on the basis of quotations obtained from brokers
            and dealers or pricing services, which take into account appropri-
            ate factors such as institutional-sized trading in similar groups
            of securities, yield, quality, coupon rate, maturity, type of is-
            sue, trading characteristics, and other market data.
               Quotations of foreign securities in foreign currency are con-
            verted to U.S. dollar equivalents using foreign exchange quota-
            tions received from independent dealers. Short-term investments
            having a maturity of 60 days or less are valued at amortized cost,
            when the Board of Trustees determines that amortized cost is their
            fair value. Certain fixed income securities for which daily market
            quotations are not readily available may be valued, pursuant to
            guidelines established by the Board of Trustees, with reference to
            fixed income securities whose prices are more readily obtainable
            and whose durations are comparable to the securities being valued.
            Subject to the foregoing, other securities for which market quota-
            tions are not readily available are valued at fair value as deter-
            mined in good faith by the Board of Trustees.
               Each Fund's liabilities are allocated among its classes. The
            total of such liabilities allocated to a class plus that class's
            distribution and/or servicing fees and any other expenses spe-
            cially allocated to that class are then deducted from the class's
            proportionate interest in the Fund's assets, and the resulting
            amount for each class is divided by the number of shares of that
            class outstanding to produce the class's "net asset value" per
            share. Under certain circumstances, the per share net asset value
            of the Class B and Class C shares of the Funds that do not declare
            regular income dividends on a daily basis may be lower than the
            per share net asset value of the Class A shares as a result of the
            daily expense accruals of the distribution fee applicable to the
            Class B and Class C shares. Generally, for Funds that pay income
            dividends, those dividends are expected to differ over time by ap-
            proximately the amount of the expense accrual differential between
            a particular Fund's classes.
 
          
<PAGE>
 
 
            Distributions

            Each Fund pays out as dividends substantially all of its net in-
            vestment income (which comes from dividends and interest it re-
            ceives or is deemed to receive from its investments) and net real-
            ized short-term capital gains. For these purposes and for federal
            income tax purposes, a portion of the premiums from certain ex-
            pired call or put options written by the Fund, net gains from
            closing purchase and sale transactions with respect to such op-
            tions, and net gains from futures transactions are treated as
            short-term capital gains. Each Fund distributes substantially all
            of its net realized capital gains, if any, after giving effect to
            any available capital loss carry-over.
                
               Shares begin earning dividends on the day after the date that
            funds are received by the Trust for the purchase of shares. For the
            Fixed Income Funds (other than the International Bond Fund),
            dividends are declared daily from net investment income to
            shareholders of record at the close of the previous business day,
            and distributed to shareholders monthly. The International Bond,
            Strategic Balanced and the Equity Funds intend to declare and pay as
            a dividend substantially all of their net investment income on a
            quarterly basis. Any net realized capital gains from the sale of
            portfolio securities will be distributed no less frequently than
            once yearly. Dividend and capital gain distributions of a Fund will
            be reinvested in additional shares of that Fund unless the
            shareholder elects to have them paid in cash. There are no sales
            charges on reinvested dividends. Dividends from net investment
            income with respect to Class B and Class C shares are expected to be
            lower than those paid with respect to Class A shares as a result of
            the distribution fees applicable to Class B and C shares.     
         
               Shareholders may elect to invest dividends and/or distributions
            paid by any Fund in shares of the same class of any other Fund of
            the Trust at net asset value. The shareholder must have an account
            existing in the Fund selected for investment with the identical
            registered name and address and must elect this option on the Ac-
            count Application, on a form provided for that purpose or by a
            telephone request to the Transfer Agent at 800-426-0107. For fur-
            ther information on this option, contact your broker or call the
            Distributor at 800-426-0107.
 
            Taxes
                
            Each Fund intends to qualify as a regulated investment company an-
            nually and to elect to be treated as a regulated investment com-
            pany under the Code. As such, a Fund generally will not pay fed-
            eral income tax on the income and gains it pays as dividends to
            its shareholders. In order to avoid a 4% federal excise tax, each
            Fund intends to distribute each year substantially all of its net
            income and gains.     
                   
               Shareholders subject to U.S. federal income tax will be subject
            to tax on dividends received from a Fund, regardless of whether
            received in cash or reinvested in additional shares. Distributions
            received by tax-exempt shareholders will not be subject to federal
            income tax to the extent permitted under applicable tax law. All
            shareholders must treat dividends, other than capital gain divi-
            dends or dividends that represent a return of capital to share-
            holders, as ordinary income.      
               
                Interest accrued by a Fund from inflation-indexed bonds will be
            includable in the Fund's gross income in the period in which it
            accrues. Periodic adjustments for inflation in the principal value
            of these securities also may give rise to original issue discount,
            which, likewise, will be includable in the Fund's gross income on a
            current basis, regardless of whether the Fund receives any cash
            payments. See "Taxation--Original Issue Discount" in the Statement
            of Additional Information. Amounts includable in a Fund's gross
            income become subject to tax-related distribution requirements.
            Accordingly, a Fund may be required to make annual distributions to
            shareholders in excess of the cash received in a given period from
            these investments. As a result, the Fund may be required to
            liquidate certain investments as a time when it is not advantageous
            to do so. If the principal value of an inflation-indexed bond is
            adjusted downward in any period as a result of deflation, the
            reduction may be treated as a loss to the extent the reduction
            exceeds coupon payments received in that period; in that case, the
            amount distributable by the Fund may be reduced and amounts
            distributed previously in the taxable year may be characterized in
            some circumstances as a return of capital.     

        
<PAGE>
                     
               Taxable shareholders should note that the timing of their in-
            vestment could have undesirable tax consequences. If shares are
            purchased on or just before the record date of a dividend, taxable
            shareholders will pay full price for the shares and may receive a
            portion of their investment back as a taxable distribution.
               The preceding discussion relates only to federal income tax;
            the consequences under other tax laws may differ. For additional
            information relating to the tax aspects of investing in a Fund,
            see the Statement of Additional Information.
 
            Management of the Trust
                    
            The business affairs of the Trust are managed under the direction of
            the Board of Trustees. The Trustees are Guilford C. Babcock, R.
            Wesley Burns, Vern O. Curtis, Brent R. Harris, Thomas P. Kemp, and
            William J. Popejoy. Additional information about the Trustees and
            the Trust's executive officers may be found in the Statement of
            Additional In-formation under the heading "Management--Trustees and
            Officers."      
         
INVESTMENT  Pacific Investment Management serves as investment adviser ("Advi-
ADVISOR     sor") to the Funds pursuant to an investment advisory contract.
            The Advisor is an investment management company founded in 1971, and
            had approximately $138 billion in assets under management as of
            June 30, 1998. Pacific Investment Management is a subsidiary of
            PIMCO Advisors L.P. ("PIMCO Advisors"). The general partners of
            PIMCO Advisors are PIMCO Partners, G.P. and PIMCO Advisors Holdings
            L.P. PIMCO Partners, G.P. is a general partnership between PIMCO
            Holding LLC, a Delaware limited liability company and an indirect
            wholly-owned subsidiary of Pacific Life Insurance Company, and PIMCO
            Partners LLC, a California limited liability company controlled by
            the Managing Directors of Pacific Investment Management. PIMCO
            Partners, G.P. is the sole general partner of PIMCO Advisors
            Holdings L.P. Pacific Investment Management's address is 840 Newport
            Center Drive, Suite 300, Newport Beach, California 92660. Pacific
            Investment Management is registered as an investment adviser with
            the Securities and Exchange Commission and as a commodity trading 
            advisor with the CFTC.     
               The Advisor manages the investment and reinvestment of the as-
            sets of each Fund. The Advisor is responsible for placing orders
            for the purchase and sale of each Fund's investments directly with
            brokers or dealers selected by it in its discretion. See "Portfo-
            lio Transactions" in the Statement of Additional Information.
 
         
<PAGE>
 
               Information about the individual portfolio managers responsible
            for management of the Trust's currently operational Funds, includ-
            ing their occupations for the past five years, is provided below.
 
<TABLE>     
<CAPTION>
                                          PORTFOLIO MANAGER AND BUSINESS
           FUND                           EXPERIENCE (PAST FIVE YEARS)
            -------------------------------------------------------------------
           <C>                            <S>
           Money Market Fund              Leslie Barbi, Senior Vice President,
                                          PIMCO. A Fixed Income Portfolio
                                          Manager, Ms. Barbi has managed the
                                          PIMCO Money Market Fund since November
                                          1, 1995. Prior to joining PIMCO in
                                          1993, Ms. Barbi was associated with
                                          Salomon Brothers as a proprietary
                                          Portfolio Manager.

           Short-Term Fund                William H. Gross, Managing Director,
           Low Duration Fund              PIMCO. A Fixed Income Portfolio
           Low Duration Fund II           Manager, Mr. Gross is one of the
           Low Duration Fund III          founders of PIMCO and has managed the
           Moderate Duration Fund         PIMCO Low Duration, Low Duration II,
           Total Return Fund              Low Duration III, Total Return, Total
           Total Return Fund II           Return II and Total Return III Funds
           Total Return Fund III          since their inception, May 11, 1987,
           Strategic Balanced Fund        November 1, 1991, December 31, 1996,
           StocksPLUS Fund                May 11, 1987, December 30, 1991, and
                                          May 1, 1991, respectively. Mr. Gross
                                          is the leader of the team which has
                                          managed the PIMCO Short-Term,
                                          StocksPLUS, Strategic Balanced and
                                          Moderate Duration Funds since January
                                          6, 1998.

           Low Duration Mortgage Fund     William C. Powers, Managing Director,
                                          PIMCO. A Fixed Income Portfolio
                                          Manager, Mr. Powers joined PIMCO in
                                          1991.

           Real Return Bond Fund          John Brynjolfsson, Vice President,
                                          PIMCO. A Fixed Income Portfolio
                                          Manager, Mr. Brynjolfsson joined PIMCO
                                          in 1989, and has managed the PIMCO
                                          Real Return Bond Fund since its
                                          inception, January 29, 1997.

           Total Return Mortgage Fund     Pasi Hamalainen, Executive Vice
           Long-Term U.S. Government Fund President, PIMCO. A Fixed Income
                                          Portfolio Manager, Mr. Hamalainen
                                          joined PIMCO in 1994 and has managed
                                          the PIMCO Long-Term U.S. Government
                                          Fund since July 1, 1997 and the Total
                                          Return Mortgage Fund since its
                                          inception, July 31, 1997.

           High Yield Fund                Benjamin Trosky, Managing Director,
                                          PIMCO. A Fixed Income Portfolio
                                          Manager, Mr. Trosky joined PIMCO in
                                          1990 and has managed the PIMCO High
                                          Yield Fund since its inception,
                                          December 16, 1992.

           Global Bond Fund               Lee R. Thomas, III, Managing Director
           Global Bond Fund II            and Senior International Portfolio
           Foreign Bond Fund              Manager, PIMCO. A Fixed Income
           International Bond Fund        Portfolio Manager, Mr. Thomas has
                                          managed the PIMCO Foreign Bond, Global
                                          Bond and International Bond Funds
                                          since July 13, 1995, and the PIMCO
                                          Global Bond Fund II since October 1,
                                          1995. Prior to joining PIMCO in 1995,
                                          Mr. Thomas was associated with
                                          Investcorp as a member of the
                                          management committee responsible for
                                          global securities and foreign exchange
                                          trading. Prior to Investcorp, he was
                                          associated with Goldman Sachs as an
                                          Executive Director in foreign fixed
                                          income.

           Emerging Markets Bond Fund     Michael J. Rosborough, Senior Vice
           Emerging Markets Bond Fund II  President, PIMCO. A Fixed Income
                                          Portfolio Manager, Mr. Rosborough was
                                          associated with RBC Dominion in Tokyo
                                          as a Vice President and Manager in
                                          foreign fixed income prior to joining
                                          PIMCO in 1994.

           Municipal Bond Fund            Benjamin Ehlert, Executive Vice
                                          President, PIMCO. A Fixed Income
                                          Portfolio Manager, Mr. Ehlert has been
                                          associated with PIMCO for over 23
                                          years.
</TABLE>      
 
         
<PAGE>
 

FUND        Pacific Investment Management also serves as administrator to the 
ADMINI-     Funds pursuant to an administration agreement with the Trust. Pa- 
STRATOR     cific Investment Management provides administrative services to    
            the Funds, which include clerical help and accounting, bookkeep-   
            ing, internal audit services, and certain other services required  
            by the Funds, preparation of reports to the Funds' shareholders    
            and regulatory filings. In addition, Pacific Investment Manage-    
            ment, at its own expense, arranges for the provision of legal, au- 
            dit, custody, transfer agency (including sub-transfer agency and   
            other administrative services) and other services for the Funds,   
            and is responsible for the costs of registration of the Trust's    
            shares and the printing of prospectuses and shareholder reports    
            for current shareholders.                                           
                 
               The Funds (and not Pacific Investment Management) are responsi-
            ble for the following expenses: (i) salaries and other compensa-
            tion of any of the Trust's executive officers and employees who
            are not officers, directors, stockholders or employees of Pacific
            Investment Management or its subsidiaries or affiliates; (ii)
            taxes and governmental fees; (iii) brokerage fees and commissions
            and other portfolio transaction expenses; (iv) the costs of bor-
            rowing money, including interest expenses; (v) fees and expenses
            of the Trustees who are not "interested persons" of Pacific In-
            vestment Management or the Trust, and any counsel retained exclu-
            sively for their benefit; (vi) extraordinary expenses, including
            costs of litigation and indemnification expenses; (vii) expenses,
            such as organizational expenses, which are capitalized in accor-
            dance with generally accepted accounting principles; and (viii)
            any expenses allocated or allocable to a specific class of shares,
            which include distribution and servicing fees payable with respect
            to Class A, Class B and Class C shares, and may include certain
            other expenses as permitted by the Trust's Multi-Class Plan
            adopted pursuant to Rule 18f-3 under the 1940 Act, subject to re-
            view and approval by the Trustees.     
 
 
ADVISORY    The Funds feature fixed advisory and administrative fee rates. For 
AND         providing investment advisory and administrative services to the   
ADMINI-     Funds as described above, Pacific Investment Management receives   
STRATIVE    monthly fees from each Fund at an annual rate (i) based on the av- 
FEES        erage daily net assets of the Fund for advisory fees and, (ii) at- 
            tributable in the aggregate to the Fund's Class A, Class B and     
            Class C shares for administrative fees, as follows:                 
            
<TABLE>        
<CAPTION>
                                                  ADVISORY
           FUND                                   FEE RATE
           --------------------------------------------------
<S>                                               <C>
           Emerging Markets Bond and Emerging
            Markets Bond II Funds                 .45%
           --------------------------------------------------
           StocksPLUS, StocksPLUS Short Strate-
            gy, Strategic Balanced and
            Commercial Mortgage Securities Funds  .40%
           --------------------------------------------------
           Money Market Fund                      .15%
           --------------------------------------------------
           All other Funds                        .25%

 
                                                  ADMINISTRATIVE
           FUND                                   FEE RATE
           -----------------------------------------------------
           <S>                                    <C>
           Emerging Markets Bond and Emerging
            Markets Bond II Funds                 .55%
           -----------------------------------------------------
           Foreign Bond, Global Bond, Global
            Bond II and International Bond Funds  .45%
           -----------------------------------------------------
           Short-Term Money Market and Municipal 
            Bond Funds                            .35%
           -----------------------------------------------------
           All other Funds                        .40%
</TABLE>          
 
 
               Both the investment advisory contract and administration agree-
            ment with respect to Class A, Class B and Class C shares of the
            Funds may be terminated by the Trustees at any time on 60 days'
            written notice. The investment advisory contract may be terminated
            by Pacific Investment Management on 60 days' written notice. Fol-
            lowing the expiration of the one-year period commencing with the
            effectiveness of the administration agreement, it may be
 
         
<PAGE>
 
                
            terminated by Pacific Investment Management on 60 days' written
            notice. Following its initial two-year term, the investment advi-
            sory contract will continue from year to year if approved by the
            Trustees. Following its initial one-year term, the administration
            agreement with respect to Class A, Class B and Class C shares of
            the Funds will continue from year-to-year if approved by the
            Trustees.     
                 
PORTFOLIO   Pursuant to the advisory contract, the Advisor places orders for
TRANS-      the purchase and sale of portfolio investments for the Funds' ac-   
ACTIONS     counts with brokers or dealers selected by it in its discretion.    
            In effecting purchases and sales of portfolio securities for the    
            account of the Funds, the Advisor will seek the best price and ex-  
            ecution of the Funds' orders. In doing so, a Fund may pay higher    
            commission rates than the lowest available when the Advisor be-     
            lieves it is reasonable to do so in light of the value of the bro-  
            kerage and research services provided by the broker effecting the   
            transaction.       
                
               The Advisor manages the Fund without regard generally to re-     
            strictions on portfolio turnover, except those imposed on its       
            ability to engage in short-term trading by provisions of the fed-   
            eral tax laws. The use of certain derivative instruments with rel-  
            atively short maturities may tend to exaggerate the portfolio       
            turnover rate for some of the Funds. Trading in fixed income secu-  
            rities does not generally involve the payment of brokerage commis-  
            sions, but does involve indirect transaction costs. The use of      
            futures contracts may involve the payment of commissions to         
            futures commission merchants. The higher the rate of portfolio      
            turnover of a Fund, the higher all these transaction costs borne    
            by the Fund generally will be. The portfolio turnover rate for      
            each Fund for which financial highlights are provided in this Pro-  
            spectus is set forth under "Financial Highlights." The portfolio    
            turnover rate for certain of the remaining Funds is incorporated    
            by reference in the Statement of Additional Information.      
                
               Some securities considered for investments by the Funds may      
            also be appropriate for other clients served by the Advisor. If a   
            purchase or sale of securities consistent with the investment pol-  
            icies of a Fund and one or more of these clients served by the Ad-  
            visor is considered at or about the same time, transactions in      
            such securities will be allocated among the Fund and clients in a
            manner deemed fair and reasonable by the Advisor. The Adviser may
            aggregate orders for the Funds with simultaneous transactions
            entered into on behalf of other clients of the Adviser so long as
            price and transaction expenses are averaged either for that
            transaction or for the day.      
 
            Description of the Trust
 
CAPITALI-   The Trust was organized as a Massachusetts business trust on Feb-  
ZATION      ruary 19, 1987. The Board of Trustees may establish additional     
            portfolios in the future. The capitalization of the Trust consists 
            solely of an unlimited number of shares of beneficial interest     
            with a par value of $0.0001 each. When issued, shares of the Trust 
            are fully paid, non-assessable and freely transferable.            
               Under Massachusetts law, shareholders could, under certain cir- 
            cumstances, be held personally liable for the obligations of the   
            Trust. However, the Declaration of Trust disclaims liability of    
            the shareholders, Trustees or officers of the Trust for acts or    
            obligations of the Trust, which are binding only on the assets and 
            property of the Trust, and requires that notice of the disclaimer  
            be given in each contract or obligation entered into or executed   
            by the Trust or the Trustees. The Declaration of Trust also pro-   
            vides for indemnification out of Trust property for all loss and   
            expense of any shareholder held personally liable for the obliga-  
            tions of the Trust. The risk of a shareholder incurring financial  
            loss on account of shareholder liability is limited to circum-     
            stances in which such disclaimer is inoperative or the Trust it-   
            self is unable to meet its obligations, and thus should be consid- 
            ered remote.                                                        
                                
MULTIPLE    In addition to Class A, Class B and Class C shares, certain Funds 
CLASSES OF  also offer Class D, Institutional Class and Administrative Class 
SHARES      shares through separate prospectuses. See "Alternative Purchase
            Arrangements." These other classes of the Funds may have different
            sales charges and expense levels, which will affect performance
            accordingly. This Prospectus relates only to the Class A, Class B
            and Class C shares of the Funds.      
 
VOTING      Shareholders have the right to vote on the election of Trustees
            and on any and all matters on which the law or the Declaration of
            Trust states they may be entitled to vote. The Trust is not re-
            quired to hold regular annual meetings of Trust shareholders and
            does not intend to do so. Shareholders of a class of shares or
            Fund have separate voting rights with respect to matters that only
            affect that class or Fund. See "Other Information--Voting Rights"
            in the Statement of Additional Information.
               The Declaration of Trust provides that the holders of not less
            than two-thirds of the outstanding shares of the Trust may remove
            a person serving as Trustee either by declaration in writing or at
            a meeting called for such purpose. The Trustees are required to
            call a meeting for the purpose of considering the removal of a
            person serving as Trustee if requested in writing to do so by the
            holders of not less than 10% of the outstanding shares of the
            Trust.
 
                                                         
<PAGE>
 
                     
               Shares entitle their holders to one vote per share (with pro-
            portionate voting for fractional shares). William Barron Hilton,
            Trustee (Beverly Hills, California) with respect to the PIMCO Short-
            Term Fund; Sprint Corporation (Westwood, Kansas) with respect to the
            PIMCO Low Duration Fund II; Loyola Academy Endowment Fund (Chicago,
            Illinois) and Sisters of St. Joseph/Michigan (Nazareth, Michigan)
            with respect to the PIMCO Low Duration Fund III; National Financial
            Services Corporation (New York, New York) with respect to the Real
            Return Bond Fund; Charles Schwab & Co., Inc. (San Francisco,
            California) with respect to the PIMCO Foreign Bond Fund; IBM
            Retirement Plan (Brooklyn, New York) with respect to the PIMCO
            Emerging Markets Bond Fund II; and California Community Foundation
            (Los Angeles, California) with respect to the PIMCO Strategic
            Balanced Fund. To the extent such share-holders are also the
            beneficial owners of those shares, they may be deemed to control (as
            that term is defined in the 1940 Act) the relevant Fund.     
 
            Mailings to Shareholders
 
            To reduce the volume of mail shareholders receive, it is antici-
            pated that only one copy of most Trust reports, such as the
            Trust's annual report, will be mailed to a shareholder's household
            (same surname, same address). A shareholder may call 800-227-7337
            if additional shareholder reports are desired.
 

          

 

<PAGE>
 
 
            Appendix A
            Description of Duration
 
            Duration is a measure of the expected life of a fixed income secu-
            rity that was developed as a more precise alternative to the con-
            cept of "term to maturity." Traditionally, a fixed income
            security's "term to maturity" has been used as a proxy for the
            sensitivity of the security's price to changes in interest rates
            (which is the "interest rate risk" or "volatility" of the securi-
            ty). However, "term to maturity" measures only the time until a
            fixed income security provides its final payment, taking no ac-
            count of the pattern of the security's payments prior to maturity.
            In contrast, duration incorporates a bond's yield, coupon interest
            payments, final maturity and call features into one measure. Dura-
            tion management is one of the fundamental tools used by the Advi-
            sor.
               Duration is a measure of the expected life of a fixed income
            security on a present value basis. Duration takes the length of
            the time intervals between the present time and the time that the
            interest and principal payments are scheduled or, in the case of a
            callable bond, expected to be received, and weights them by the
            present values of the cash to be received at each future point in
            time. For any fixed income security with interest payments occur-
            ring prior to the payment of principal, duration is always less
            than maturity. In general, all other things being equal, the lower
            the stated or coupon rate of interest of a fixed income security,
            the longer the duration of the security; conversely, the higher
            the stated or coupon rate of interest of a fixed income security,
            the shorter the duration of the security.
               Futures, options and options on futures have durations which,
            in general, are closely related to the duration of the securities
            which underlie them. Holding long futures or call option positions
            (backed by a segregated account of cash and cash equivalents) will
            lengthen a Fund's duration by approximately the same amount that
            holding an equivalent amount of the underlying securities would.
               Short futures or put option positions have durations roughly
            equal to the negative duration of the securities that underlie
            these positions, and have the effect of reducing portfolio dura-
            tion by approximately the same amount that selling an equivalent
            amount of the underlying securities would.
               There are some situations where even the standard duration cal-
            culation does not properly reflect the interest rate exposure of a
            security. For example, floating and variable rate securities often
            have final maturities of ten or more years; however, their inter-
            est rate exposure corresponds to the frequency of the coupon re-
            set. For inflation-indexed bonds, duration is calculated on the
            basis of modified real duration, which measures price changes of
            inflation-indexed bonds on the basis of changes in real, rather
            than nominal, interest rates. Another example where the interest
            rate exposure is not properly captured by duration is the case of
            mortgage pass-through securities. The stated final maturity of
            such securities is generally 30 years, but current prepayment
            rates are more critical in determining the securities' interest
            rate exposure. Finally, the duration of a fixed income security
            may vary over time in response to changes in interest rates and
            other market factors. In these and other similar situations, the
            Advisor will use more sophisticated analytical techniques that in-
            corporate the anticipated economic life of a security into the de-
            termination of its interest rate exposure.
 
                                                            
<PAGE>
 
 
            Appendix B
            Description of Securities Ratings
 
            Certain of the Funds make use of average portfolio credit quality
            standards to assist institutional investors whose own investment
            guidelines limit their investments accordingly. In determining a
            Fund's overall dollar-weighted average quality, unrated securities
            are treated as if rated, based on the Advisor's view of their com-
            parability to rated securities. A Fund's use of average quality
            criteria is intended to be a guide for those institutional invest-
            ors whose investment guidelines require that assets be invested
            according to comparable criteria. Reference to an overall average
            quality rating for a Fund does not mean that all securities held
            by the Fund will be rated in that category or higher. A Fund's in-
            vestments may range in quality from securities rated in the lowest
            category in which the Fund is permitted to invest to securities
            rated in the highest category (as rated by Moody's or S&P or, if
            unrated, determined by the Advisor to be of comparable quality).
            The percentage of a Fund's assets invested in securities in a par-
            ticular rating category will vary. Following is a description of
            Moody's and S&P's ratings applicable to fixed income securities.
 
 
MOODY'S     CORPORATE AND MUNICIPAL BOND RATINGS
INVESTORS   Aaa: Bonds which are rated Aaa are judged to be of the best quali-
SERVICE,    ty. They carry the smallest degree of investment risk and are gen-
INC.        erally referred to as "gilt edge." Interest payments are protected
            by a large or by an exceptionally stable margin and principal is
            secure. While the various protective elements are likely to
            change, such changes as can be visualized are most unlikely to im-
            pair the fundamentally strong position of such issues.
               Aa: Bonds which are rated Aa are judged to be of high quality
            by all standards. Together with the Aaa group they comprise what
            are generally known as high-grade bonds. They are rated lower than
            the best bonds because margins of protection may not be as large
            as in Aaa securities or fluctuation of protective elements may be
            of greater amplitude or there may be other elements present that
            make the long-term risks appear somewhat larger than with Aaa se-
            curities.
               A: Bonds which are rated A possess many favorable investment
            attributes and are to be considered as upper-medium-grade obliga-
            tions. Factors giving security to principal and interest are con-
            sidered adequate but elements may be present that suggest a sus-
            ceptibility to impairment sometime in the future.
               Baa: Bonds which are rated Baa are considered as medium-grade
            obligations (i.e., they are neither highly protected nor poorly
            secured). Interest payments and principal security appear adequate
            for the present but certain protective elements may be lacking or
            may be characteristically unreliable over any great length of
            time. Such bonds lack outstanding investment characteristics and
            in fact have speculative characteristics as well.
               Ba: Bonds which are rated Ba are judged to have speculative el-
            ements; their future cannot be considered as well-assured. Often
            the protection of interest and principal payments may be very mod-
            erate and thereby not well safeguarded during both good and bad
            times over the future. Uncertainty of position characterizes bonds
            in this class.
               B: Bonds which are rated B generally lack characteristics of a
            desirable investment. Assurance of interest and principal payments
            or of maintenance of other terms of the contract over any long pe-
            riod of time may be small.
               Caa: Bonds which are rated Caa are of poor standing. Such is-
            sues may be in default or there may be present elements of danger
            with respect to principal or interest.
               Ca: Bonds which are rated Ca represent obligations which are
            speculative in a high degree. Such issues are often in default or
            have other marked shortcomings.
               C: Bonds which are rated C are the lowest rated class of bonds
            and issues so rated can be regarded as having extremely poor pros-
            pects of ever attaining any real investment standing.
               Moody's applies numerical modifiers, 1, 2, and 3 in each ge-
            neric rating classified from Aa through B in its corporate bond
            rating system. The modifier 1 indicates that the security ranks in
            the higher end of its generic rating category; the modifier 2 in-
            dicates a mid-range ranking; and the modifier 3 indicates that the
            issue ranks in the lower end of its generic rating category.
 
          
<PAGE>
 
 
            CORPORATE SHORT-TERM DEBT RATINGS
            Moody's short-term debt ratings are opinions of the ability of is-
            suers to repay punctually senior debt obligations which have an
            original maturity not exceeding one year. Obligations relying upon
            support mechanisms such as letters of credit and bonds of indem-
            nity are excluded unless explicitly rated.
               Moody's employs the following three designations, all judged to
            be investment grade, to indicate the relative repayment ability of
            rated issuers:
               PRIME-1: Issuers rated Prime-1 (or supporting institutions)
            have a superior ability for repayment of senior short-term debt
            obligations. Prime-1 repayment ability will often be evidenced by
            many of the following characteristics: leading market positions in
            well-established industries; high rates of return on funds em-
            ployed; conservative capitalization structure with moderate reli-
            ance on debt and ample asset protection; broad margins in earnings
            coverage of fixed financial charges and high internal cash genera-
            tion; and well-established access to a range of financial markets
            and assured sources of alternate liquidity.
               PRIME-2: Issuers rated Prime-2 (or supporting institutions)
            have a strong ability for repayment of senior short-term debt ob-
            ligations. This will normally be evidenced by many of the charac-
            teristics cited above but to a lesser degree. Earnings trends and
            coverage ratios, while sound, may be more subject to variation.
            Capitalization characteristics, while still appropriate, may be
            more affected by external conditions. Ample alternate liquidity is
            maintained.
               PRIME-3: Issuers rated Prime-3 (or supporting institutions)
            have an acceptable ability for repayment of senior short-term ob-
            ligations. The effect of industry characteristics and market com-
            positions may be more pronounced. Variability in earnings and
            profitability may result in changes in the level of debt protec-
            tion measurements and may require relatively high financial lever-
            age. Adequate alternate liquidity is maintained.
               NOT PRIME: Issuers rated Not Prime do not fall within any of
            the Prime rating categories.
 
 
STANDARD &  CORPORATE AND MUNICIPAL BOND RATINGS
POOR'S
CORPORATION
 
            Investment Grade
            AAA: Debt rated AAA has the highest rating assigned by Standard &
            Poor's. Capacity to pay interest and repay principal is extremely
            strong.
               AA: Debt rated AA has a very strong capacity to pay interest
            and repay principal and differs from the highest rated issues only
            in small degree.
               A: Debt rated A has a strong capacity to pay interest and repay
            principal although it is somewhat more susceptible to the adverse
            effects of changes in circumstances and economic conditions than
            debt in higher rated categories.
               BBB: Debt rated BBB is regarded as having an adequate capacity
            to pay interest and repay principal. Whereas it normally exhibits
            adequate protection parameters, adverse economic conditions, or
            changing circumstances are more likely to lead to a weakened ca-
            pacity to pay interest and repay principal for debt in this cate-
            gory than in higher-rated categories.
 
            Speculative Grade
            Debt rated BB, B, CCC, CC, and C is regarded as having predomi-
            nantly speculative characteristics with respect to capacity to pay
            interest and repay principal. BB indicates the least degree of
            speculation and C the highest. While such debt will likely have
            some quality and protective characteristics, these are outweighed
            by large uncertainties or major exposures to adverse conditions.
               BB: Debt rated BB has less near-term vulnerability to default
            than other speculative issues. However, it faces major ongoing un-
            certainties or exposure to adverse business, financial, or eco-
            nomic conditions which could lead to

         
<PAGE>
 
            inadequate capacity to meet timely interest and principal pay-
            ments. The BB rating category is also used for debt subordinated
            to senior debt that is assigned an actual or implied BBB- rating.
               B: Debt rated B has a greater vulnerability to default but cur-
            rently has the capacity to meet interest payments and principal
            repayments. Adverse business, financial, or economic conditions
            will likely impair capacity or willingness to pay interest and re-
            pay principal. The B rating category is also used for debt subor-
            dinated to senior debt that is assigned an actual or implied BB or
            BB- rating.
               CCC: Debt rated CCC has a currently identifiable vulnerability
            to default and is dependent upon favorable business, financial,
            and economic conditions to meet timely payment of interest and re-
            payment of principal. In the event of adverse business, financial
            or economic conditions, it is not likely to have the capacity to
            pay interest and repay principal. The CCC rating category is also
            used for debt subordinated to senior debt that is assigned an ac-
            tual or implied B or B- rating.
               CC: The rating CC is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC rating.
               C: The rating C is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC- debt rat-
            ing. The C rating may be used to cover a situation where a bank-
            ruptcy petition has been filed, but debt service payments are con-
            tinued.
               CI: The rating CI is reserved for income bonds on which no in-
            terest is being paid.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period. The D rating will also be used upon the filing of a
            bankruptcy petition if debt service payments are jeopardized.
               Plus (+) or Minus (-): The ratings from AA to CCC may be modi-
            fied by the addition of a plus or minus sign to show relative
            standing within the major rating categories.
               Provisional ratings: The letter "p" indicates that the rating
            is provisional. A provisional rating assumes the successful com-
            pletion of the project being financed by the debt being rated and
            indicates that payment of debt service requirements is largely or
            entirely dependent upon the successful and timely completion of
            the project. This rating, however, while addressing credit quality
            subsequent to completion of the project, makes no comment on the
            likelihood of, or the risk of default upon failure of, such com-
            pletion. The investor should exercise his own judgment with re-
            spect to such likelihood and risk.
               r: The "r" is attached to highlight derivative, hybrid, and
            certain other obligations that S&P believes may experience high
            volatility or high variability in expected returns due to non-
            credit risks. Examples of such obligations are: securities whose
            principal or interest return is indexed to equities, commodities,
            or currencies; certain swaps and options; and interest only and
            principal only mortgage securities.
               The absence of an "r" symbol should not be taken as an indica-
            tion that an obligation will exhibit no volatility or variability
            in total return.
               N.R.: Not rated.
               Debt obligations of issuers outside the United States and its
            territories are rated on the same basis as domestic corporate and
            municipal issues. The ratings measure the creditworthiness of the
            obligor but do not take into account currency exchange and related
            uncertainties.
 
          
<PAGE>
 
 
            COMMERCIAL PAPER RATING DEFINITIONS
            A Standard & Poor's commercial paper rating is a current assess-
            ment of the likelihood of timely payment of debt having an origi-
            nal maturity of no more than 365 days. Ratings are graded into
            several categories, ranging from A for the highest quality obliga-
            tions to D for the lowest. These categories are as follows:
               A-1: This highest category indicates that the degree of safety
            regarding timely payment is strong. Those issues determined to
            possess extremely strong safety characteristics are denoted with a
            plus sign (+) designation.
               A-2: Capacity for timely payment on issues with this designa-
            tion is satisfactory. However, the relative degree of safety is
            not as high as for issues designated A-1.
               A-3: Issues carrying this designation have adequate capacity
            for timely payment. They are, however, more vulnerable to the ad-
            verse effects of changes in circumstances than obligations carry-
            ing the higher designations.
               B: Issues rated B are regarded as having only speculative ca-
            pacity for timely payment.
               C: This rating is assigned to short-term debt obligations with
            a doubtful capacity for payment.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due, even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period.
               A commercial paper rating is not a recommendation to purchase,
            sell or hold a security inasmuch as it does not comment as to mar-
            ket price or suitability for a particular investor. The ratings
            are based on current information furnished to Standard & Poor's by
            the issuer or obtained from other sources it considers reliable.
            Standard & Poor's does not perform an audit in connection with any
            rating and may, on occasion, rely on unaudited financial informa-
            tion. The ratings may be changed, suspended, or withdrawn as a re-
            sult of changes in or unavailability of such information.

         
<PAGE>
     
                      ----------------------------------------------------------
PIMCO Funds           INVESTMENT ADVISOR AND ADMINISTRATOR
Pacific Investment
Management Series     Pacific Investment Management Company, 840 Newport Center 
                      Drive, Suite 300, Newport Beach, CA 92660       

                      ----------------------------------------------------------
                      DISTRIBUTOR
               
                      PIMCO Funds Distributors LLC, 2187 Atlantic Street, 
                      Stamford, CT 06902       

                      ----------------------------------------------------------
                      CUSTODIAN
    
                      Investors Fiduciary Trust Company, 801 Pennsylvania
                      Kansas City, MO 64105       

                      ----------------------------------------------------------
                      SHAREHOLDER SERVICING AGENT AND TRANSFER AGENT

                      Shareholder Services, Inc., P.O. Box 5866, Denver, 
                      Co 80217
                          
                      ----------------------------------------------------------
                      For further information about the Trust, call 
                      1-800-227-7337.     




                      P I M C O

                      Printed on Recycled Paper Using Soy-Based Inks.
<PAGE>
 
CLASS D SHARES

                  PIMCO Funds Prospectus
                    
                
                
                
                  --------------------------------------------------------------
Pacific           STOCK FUNDS
Investment      
Management        StocksPLUS Fund
Series            StocksPLUS Short Strategy Fund*
       
August 1, 1998               
                  --------------------------------------------------------------
                  STOCK AND BOND FUNDS
                
                  Strategic Balanced Fund
                
                  --------------------------------------------------------------
                  LONG-TERM BOND FUNDS
                
                  Long-Term U.S. Government Fund*
                
                  --------------------------------------------------------------
                  INTERMEDIATE-TERM BOND FUNDS
                
                  Emerging Markets Bond Fund*        Total Return Fund II*
                  Emerging Markets Bond Fund II*     Total Return Fund III*
                  Foreign Bond Fund                  Total Return Mortgage Fund
                  Global Bond Fund*                  Commercial Mortgage
                  Global Bond Fund II*                 Securities Fund*
                  International Bond Fund*           Moderate Duration Fund*
                  High Yield Fund                    Real Return Bond Fund
                  Total Return Fund
                
                  --------------------------------------------------------------
                  SHORTER-TERM BOND FUNDS
                
                  Low Duration Fund                  Low Duration Mortgage Fund*
                  Low Duration Fund II*              Short-Term Fund
                  Low Duration Fund III*             Money Market Fund*
                
                  --------------------------------------------------------------
                  TAX EXEMPT FUND

                  Municipal Bond Fund

                  * These Funds are not available for investment as of the date
                  of this Prospectus.



                                              [LOGO OF PIMCO FUNDS APPEARS HERE]

<PAGE>
 
            PIMCO Funds: Pacific Investment Management Series
            Prospectus
                
            August 1, 1998           
                
            PIMCO Funds: Pacific Investment Management Series (the "Trust") is
            an open-end series management investment company offering twenty-
            five separate investment portfolios (each a "Fund") in this
            prospectus. The Trust is designed to provide access to the profes-
            sional investment management services offered by Pacific Investment
            Management Company ("Pacific Investment Management"), which serves
            as investment adviser (the "Advisor") to the Funds. The address of
            PIMCO Funds is 840 Newport Center Drive, Suite 300, Newport Beach,
            CA 92660.     
            
            Each Fund offers Class D shares in this Prospectus. Through sepa-
            rate prospectuses, certain Funds and other series of the Trust of-
            fer up to five additional classes of shares, Institutional Class
            shares, Administrative Class shares, Class A shares, Class B
            shares and Class C shares. See "Description of the Trust--Multiple
            Classes of Shares."
 
            This Prospectus concisely describes the information investors
            should know before investing in Class D shares of the Funds.
            Please read this Prospectus carefully and keep it for further ref-
            erence. Information about the investment objective of each Fund,
            along with a detailed description of the types of securities in
            which each Fund may invest and of investment policies and restric-
            tions applicable to each Fund, are set forth in this Prospectus.
            There can be no assurance that the investment objective of any
            Fund will be achieved. Because the market value of each Fund's in-
            vestments will change, the investment returns and net asset value
            per share of each Fund will vary.
 
            Class D shares are offered only to financial service firms, such as
            broker-dealers or registered investment advisers, with which the
            Funds' distributor has an agreement for the use of the Funds in
            particular investment products, programs or accounts for which a fee
            may be charged. Other eligible investors are listed under "How to
            Buy Shares." If you wish to purchase shares directly from the Trust
            or the Funds' distributor, please consider one of the other classes
            of shares. See "Description of the Trust--Multiple Classes of
            Shares."
                
            A Statement of Additional Information, dated August 1, 1998, as
            amended or supplemented from time to time, is available free of
            charge by writing to PIMCO Funds Distributors LLC (the "Dis-
            tributor"), 2187 Atlantic Street, Stamford, Connecticut 06902, or by
            telephoning 800-426-0107. The Statement of Additional Information,
            which contains more detailed information about the Trust, has been
            filed with the Securities and Exchange Commission and is
            incorporated by reference in this Prospectus. The Securities and
            Exchange Commission maintains an Internet World Wide Web site (at
            www.sec.gov) which contains the Statement of Additional Information,
            materials that are incorporated by reference into this Prospectus
            and the Statement of Additional Information, and other information
            about the Funds.     
            
            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SE-
            CURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMIS-
            SION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
            SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
            PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OF-
            FENSE.
     
            SHARES OF THE FUNDS ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARAN-
            TEED OR ENDORSED BY, ANY FINANCIAL INSTITUTION, AND THE SHARES ARE
            NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORA-
            TION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY, AND ENTAIL 
            RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.     
     
            INVESTMENT IN THE MONEY MARKET FUND (OR IN ANY OTHER FUND) IS NEI-
            THER INSURED NOR GUARANTEED BY THE U.S. GOVERNMENT. THERE CAN BE
            NO ASSURANCE THAT THE MONEY MARKET FUND WILL BE ABLE TO MAINTAIN A
            STABLE NET ASSET VALUE OF $1.00 PER SHARE.     
     
            EACH OF THE FUNDS, EXCEPT THE MONEY MARKET FUND AND THE MUNICIPAL
            BOND FUND, MAY INVEST ALL OF ITS ASSETS IN DERIVATIVE INSTRUMENTS,
            SOME OF WHICH MAY BE PARTIC-ULARLY SENSITIVE TO CHANGES IN
            PREVAILING INTEREST RATES. UNEX-PECTED CHANGES IN INTEREST RATES MAY
            ADVERSELY AFFECT THE VALUE OF A FUND'S INVESTMENTS IN PARTICULAR
            DERIVATIVE INSTRUMENTS.     
 
            THE HIGH YIELD AND EMERGING MARKETS BOND FUNDS MAY INVEST ALL OF
            THEIR ASSETS IN JUNK BONDS, WHICH ARE SUBJECT TO HIGH RISK, AND
            SPECULATIVE WITH REGARD TO PAYMENT OF INTEREST AND RETURN OF PRIN-
            CIPAL. INVESTORS SHOULD CAREFULLY CONSIDER THESE RISKS BEFORE IN-
            VESTING IN THE HIGH YIELD FUND. SEE "CHARACTERISTICS AND RISKS OF
            SECURITIES AND INVESTMENT TECHNIQUES--HIGH YIELD SECURITIES ("JUNK
            BONDS")."
 
 
                               TABLE OF CONTENTS
<TABLE>
<S>                                <C>   <C>                                <C>
PIMCO Funds Overview..............   3   Distributor.......................  38
Schedule of Fees..................   4   How Net Asset Value Is Determined
Investment Objectives and                ..................................  39
Policies..........................   6   Distributions.....................  40
Investment Risks and                     Taxes.............................  42
Considerations....................  13   Management of the Trust...........  42
Characteristics and Risks of             Description of the Trust..........  45
 Securities                              Mailings to Shareholders..........  46
 and Investment Techniques........  14   Appendix A--Description of
Performance Information...........  28   Duration..........................  47
How to Buy Shares.................  30   Appendix B--Description of
Exchange Privilege................  34   Securities Ratings................  48
How to Redeem.....................  34
</TABLE>
 
2  PIMCO Funds: Pacific Investment Management Series
<PAGE>
                 
            PIMCO Funds Overview Pacific Investment Management, a subsidiary
            partnership of PIMCO Advisors L.P., is the investment adviser of all
            of the Funds. Pacific Investment Management is one of the premier
            fixed income investment management firms in the U.S. As of June 30,
            1998, Pacific Investment Management had approximately $138 billion
            in assets under management. Pacific Investment Management invests in
            all sectors of the fixed income market, using its total return
            philosophy--seeking capital appreciation as well as yield.     
       
<TABLE>    
<CAPTION>
                            PIMCO                     PRIMARY
                            FUND NAME                 OBJECTIVE                              DURATION          CREDIT QUALITY(/1/)
           -----------------------------------------------------------------------------------------------------------------------
           <S>              <C>                       <C>                                    <C>               <C>
           LONG-TERM BOND   Long-Term U.S. Government Maximum total return, consistent       Greater than or   A to Aaa
            FUNDS                                     with preservation of capital           equal to
                                                      and prudent investment management      8 years
           -----------------------------------------------------------------------------------------------------------------------
           INTERMEDIATE-    Emerging Markets Bond     Maximum total return, consistent       0-8 years         B to Aaa
           TERM                                       with preservation of capital
           BOND FUNDS                                 and prudent investment management
                                                      (non-U.S.)
                            ------------------------------------------------------------------------------------------------------
                            Emerging Markets Bond II  Maximum total return, consistent       0-8 years         B to Aaa
                                                      with preservation of capital and
                                                      prudent investment management
                            ------------------------------------------------------------------------------------------------------
                            Foreign Bond              Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                                                      and prudent investment management
                                                      (non-U.S.)
                            ------------------------------------------------------------------------------------------------------
                            Global Bond               Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital (U.S.                       10% below Baa
                                                      and non-U.S.)
                            ------------------------------------------------------------------------------------------------------
                            Global Bond II            Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital (U.S.                       10% below Baa
                                                      and non-U.S.)
                            ------------------------------------------------------------------------------------------------------
                            International Bond        Maximum total return, consistent       0-8 years         Baa to Aaa
                                                      with preservation of capital (U.S.
                                                      and non-U.S.)
                            ------------------------------------------------------------------------------------------------------
                            High Yield                Maximum total return, consistent       2-6 years         B to Aaa; min
                                                      with preservation of capital                             65% below Baa
                                                      and prudent investment management
                            ------------------------------------------------------------------------------------------------------
                            Total Return              Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                                                      and prudent investment management
                            ------------------------------------------------------------------------------------------------------
                            Total Return II           Maximum total return, consistent       3-6 years         Baa to Aaa
                                                      with preservation of capital
                            ------------------------------------------------------------------------------------------------------
                            Total Return III          Maximum total return, consistent       3-6 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                            ------------------------------------------------------------------------------------------------------
                            Total Return Mortgage     Maximum total return, consistent       2-6 years         Baa to Aaa; max
                                                      with preservation of capital and                         10% below Aaa
                                                      prudent investment management                       
                            ------------------------------------------------------------------------------------------------------
                            Commercial Mortgage       Maximum total return, consistent       3-8 years         B to Aaa; max
                            Securities                with preservation of capital                             35% below Baa
                            ------------------------------------------------------------------------------------------------------
                            Moderate Duration         Maximum total return, consistent       2-5 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                            ------------------------------------------------------------------------------------------------------
                            Real Return Bond          Maximum real return, consistent        Not applicable,   B to Aaa; max 
                                                      with preservation of real capital      but see Fund      10% below Baa 
                                                      and prudent investment management      description 
           -----------------------------------------------------------------------------------------------------------------------
           SHORTER-TERM     Low Duration              Maximum total return, consistent       1-3 years         B to Aaa; max
            BOND FUNDS                                with preservation of capital                             10% below Baa
                                                      and prudent investment management
                            ------------------------------------------------------------------------------------------------------
                            Low Duration II           Maximum total return, consistent       1-3 years         A to Aaa
                                                      with preservation of capital
                            ------------------------------------------------------------------------------------------------------
                            Low Duration III          Maximum total return, consistent       1-3 years         B to Aaa; max
                                                      with preservation of capital                             10% below Baa
                            ------------------------------------------------------------------------------------------------------
                            Low Duration Mortgage     Maximum total return, consistent       1-3 years         B to Aaa;
                                                      with preservation of capital and                         10% below Aaa
                                                      prudent investment management          
                            ------------------------------------------------------------------------------------------------------
                            Short-Term                Maximum current income, consistent     0-1 year          B to Aaa; max
                                                      with preservation of capital and                         10% below Baa
                                                      daily liquidity
                            ------------------------------------------------------------------------------------------------------
                            Money Market              Maximum current income, consistent     Less than or      Min 95% Aaa or
                                                      with preservation of capital and       equal to 90 days  Prime 1; less
                                                      daily liquidity                        dollar-weighted   than or equal to
                                                                                             average maturity  5% Aa or Prime 2
           -----------------------------------------------------------------------------------------------------------------------
           TAX EXEMPT FUND  Municipal Bond            High current income exempt from        3-10 years        Ba to Aaa; max
                                                      federal income tax, consistent with                      10% below Baa
                                                      preservation of capital
           -----------------------------------------------------------------------------------------------------------------------
           EQUITY FUND      StocksPLUS(/2/)           Total return which exceeds that of the 0-1 year          B to Aaa; max
                                                      S&P 500                                                  10% below Baa
                            ------------------------------------------------------------------------------------------------------
                            StocksPLUS Short          Total return through implementation    0-1 year          B to Aaa; max
                            Strategy                  of short positions on the S&P 500                        10% below Baa
           -----------------------------------------------------------------------------------------------------------------------
           STOCK AND BOND   Strategic Balanced        Maximum total return, consistent       0-6 years         B to Aaa; max
            FUNDS                                     with preservation of capital                             10% below Baa
           -----------------------------------------------------------------------------------------------------------------------
</TABLE>     
 
FUND
PROFILES
            1. As rated by Moody's Investors Service, Inc., or if unrated, de-
            termined to be of comparable quality. For specific information
            concerning the credit quality of the securities in each Fund's
            portfolio, see "Investment Objectives and Policies."
            2. The StocksPLUS Fund may invest all of its assets in stock index
            futures backed by short-term bonds.
                                                   
                                                August 1, 1998 Prospectus 3     
<PAGE>
 
            Schedule of Fees
 
 
 
<TABLE>
<CAPTION>
           All Funds-Class D Shares
           -------------------------------------------------------------------
           <S>                                                        <C>
           MAXIMUM INITIAL SALES CHARGE IMPOSED ON PURCHASES
            (as a percentage of offering price at time of purchase)    None
           -------------------------------------------------------------------
           MAXIMUM SALES CHARGE IMPOSED ON REINVESTED DIVIDENDS
            (as a percentage of net asset value at time of purchase)   None
           -------------------------------------------------------------------
           MAXIMUM DEFERRED SALES CHARGE
            (as a percentage of original purchase price)               None
           -------------------------------------------------------------------
           EXCHANGE FEE                                                None
</TABLE>
 
SHAREHOLDER
TRANSACTION
EXPENSES
 
<TABLE>
<CAPTION>
                                                                                     EXAMPLE: You
                                                                                     would pay the
                                                                                     following
                                                                                     expenses on a
                                                                                     $1,000 investment
                                                                                     assuming (1) 5%
                                                                                     annual return and
                                        ANNUAL FUND OPERATING                        (2) redemption at
                                        EXPENSES (As a percentage of                 the end of each
                                        average net assets):                         time period:
                                                                         TOTAL
                                                  ADMINI-    12b-1       FUND
                                        ADVISORY  STRATIVE   (SERVICE)   OPERATING   YEAR
           FUND                         FEE       FEE(/1/)   FEE(/1/)    EXPENSES    1    3   5   10
           --------------------------------------------------------------------------------------------
           <S>                          <C>       <C>        <C>         <C>         <C>  <C> <C> <C>
           LONG-TERM U.S.                                                          
           GOVERNMENT                   .25%      .40%        0.25%        .90%       $ 9  $29 $50 $111
           --------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND        .45       .55         0.25        1.25         --   --  --   --
           --------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND II     .45       .55         0.25        1.25         --   --  --   --
           --------------------------------------------------------------------------------------------
           FOREIGN BOND                 .25       .45         0.25         .95         10   30  53  117
           --------------------------------------------------------------------------------------------
           GLOBAL BOND                  .25       .45         0.25         .95         10   30  53  117
           --------------------------------------------------------------------------------------------
           GLOBAL BOND II               .25       .45         0.25         .95         10   30  53  117
           --------------------------------------------------------------------------------------------
           INTERNATIONAL BOND           .25       .45         0.25         .95         10   30  53  117
           --------------------------------------------------------------------------------------------
           HIGH YIELD                   .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           TOTAL RETURN                 .25       .25         0.25         .75          8   24  42   93
           --------------------------------------------------------------------------------------------
           TOTAL RETURN II              .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           TOTAL RETURN III             .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           TOTAL RETURN MORTGAGE        .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           COMMERCIAL MORTGAGE                                                     
            SECURITIES                  .40       .40         0.25        1.05         11   33  58  128
           --------------------------------------------------------------------------------------------
           MODERATE DURATION            .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           REAL RETURN BOND             .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           LOW DURATION                 .25       .25         0.25         .75          8   24  42   93
           --------------------------------------------------------------------------------------------
           LOW DURATION II              .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           LOW DURATION III             .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           LOW DURATION MORTGAGE        .25       .40         0.25         .90          9   29  50  111
           --------------------------------------------------------------------------------------------
           SHORT-TERM                   .25       .25         0.25         .75          8   24  42   93
           --------------------------------------------------------------------------------------------
           MONEY MARKET                 .15       .20         0.25         .60         --   --  --   --
           --------------------------------------------------------------------------------------------
           MUNICIPAL BOND               .25       .35         0.25         .90          9   27  47  105
           --------------------------------------------------------------------------------------------
           STOCKSPLUS                   .40       .40         0.25        1.05         11   33  58  128
           --------------------------------------------------------------------------------------------
           STOCKSPLUS SHORT                                                        
             STRATEGY                   .40       .40         0.25        1.05         11   33  58  128
           --------------------------------------------------------------------------------------------
           STRATEGIC BALANCED           .40       .40         0.25        1.05         11   33  58  128
           --------------------------------------------------------------------------------------------
</TABLE>
 
            1. The administration agreement for Class D shares has been adopted
            in conformity with the requirements set forth in Rule 12b-1 of the
            Investment Company Act of 1940. The plan provides that up to .25%
            per annum of the total fees paid under the administration agreement
            may represent reimbursement for expenses in respect of activities
            ("subject activities") that may be deemed to be primarily intended
            to result in the sale of Class D shares. The Money Market Fund will
            pay a total of .45% per annum, the Short-Term, Low Duration and
            Short-Term Funds will pay a total of .50% per annum, the Municipal
            Bond Fund will pay a total of .60% per annum, the Foreign Bond,
            Global Bond, Global Bond II and International Bond Funds will pay a
            total of .70% per annum, the Emerging Markets Bond and Emerging
            Markets Bond Fund II will pay a total of .80% per annum, and each
            remaining Fund will pay a total of .65% per annum, under the
            administration agreement regardless of whether a portion or none of
            the .25% authorized under the plan is paid for subject services. To
            the extent that any payments are deemed to be made pursuant to the
            plan, the funds intend to treat such payments as service fees for
            purposes of applicable rules of the National Association of
            Securities Dealers, Inc. See "Management of the Trust--Fund
            Administrator".

            The purpose of the foregoing tables is to assist investors in un-
            derstanding the various costs and expenses of the Trust that are
            borne directly or indirectly by Class D shareholders of the Funds.
            The information is based upon each Fund's current fees and expenses.
 
            NOTE: THE FIGURES SHOWN IN THE EXAMPLE ARE ENTIRELY HYPOTHETICAL.
            THEY ARE NOT REPRESENTATIONS OF PAST OR FUTURE PERFORMANCE OR EX-
            PENSES; ACTUAL PERFORMANCE AND/OR EXPENSES MAY BE MORE OR LESS THAN
            SHOWN.
 
4 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                     (This page left blank intentionally)

                                                    
                                               August 1, 1998 Prospectus 5     



<PAGE>
 
             Investment Objectives and Policies

             The investment objective and general investment policies of each
             Fund are described below. There can be no assurance that the in-
             vestment objective of any Fund will be achieved. For temporary,
             defensive or emergency purposes, a Fund may invest without limit in
             U.S. debt securities, including short-term money market securi-
             ties, when in the opinion of the Advisor it is appropriate to do
             so. It is impossible to predict for how long such alternative
             strategies will be utilized. The value of all securities and other
             instruments held by the Funds will vary from time to time in re-
             sponse to a wide variety of market factors. Consequently, the net
             asset value per share of each Fund will vary, except that the Money
             Market Fund will attempt to maintain a net asset value of $1.00 per
             share, although there can be no assurance that the Fund will be
             successful in doing so.
                The investment objective of the Global Bond Fund II described in
             this Prospectus may be changed by the Board of Trustees without
             shareholder approval. The investment objective of each other Fund
             is fundamental and may not be changed without shareholder approval
             by vote of a majority of the outstanding shares of that Fund. If
             there is a change in a Fund's investment objective, including a
             change approved by a shareholder vote, shareholders should con-
             sider whether the Fund remains an appropriate investment in light
             of their then current financial position and needs.
                Specific portfolio securities eligible for purchase by the
             Funds, investment techniques that may be used by the Funds, and the
             risks associated with these securities and techniques are de-
             scribed more fully under "Characteristics and Risks of Securities
             and Investment Techniques" in this Prospectus and "Investment Ob-
             jectives and Policies" in the Statement of Additional Information.
              
FIXED        With the exception of the StocksPLUS, StocksPLUS Short Strategy and
INCOME FUND  Strategic Balanced Funds, each remaining Fund (together, the "Fixed
DESCRIPTIONS Income Funds") differs from the others primarily in the length of
             the Fund's duration or the proportion of its investments in certain
             types of fixed income securities. For a discussion of the concept
             of duration, see "Appendix A--Description of Duration."
    
                The investment objective of the Global Bond Fund II is to seek
             maximum total return, consistent with the preservation of capital.
             The investment objective of the Municipal Bond Fund is to seek high
             current income exempt from federal income tax, consistent with
             preservation of capital. Capital appreciation is a secondary
             objective of the Municipal Bond Fund. The investment objective of
             the Real Return Bond Fund is to seek to realize maximum real
             return, consistent with the preservation of real capital and
             prudent investment management. For a discussion of "real return,"
             see "Total Return and Real Return," below. The investment
             objective of the Short-Term Fund and the Money Market Fund is to
             seek to obtain maximum current income consistent with preservation
             of capital and daily liquidity. The Money Market Fund also attempts
             to maintain a stable net asset value of $1.00 per share, although
             there can be no assurance that it will be successful in doing so.
             Each of the remaining Fixed Income Funds seeks to maximize total
             return, consistent with preservation of capital and prudent
             investment management .
         
                In selecting securities for each Fixed Income Fund, the Advisor
             utilizes economic forecasting, interest rate anticipation, credit
             and call risk analysis, foreign currency exchange rate forecast-
             ing, and other security selection techniques. The proportion of
             each Fund's assets committed to investment in securities with par-
             ticular characteristics (such as maturity, type and coupon rate)
             will vary based on the Advisor's outlook for the U.S. and foreign
             economies, the financial markets, and other factors.
                 
                Each of the Fixed Income Funds will invest at least 65% of its
             assets in the following types of securities, which, unless specif-
             ically provided otherwise in the descriptions of the Funds that
             follow, may be issued by domestic or foreign entities and denomi-
             nated in U.S. dollars or foreign currencies: securities issued or
             guaranteed by the U.S. Government, its agencies or instrumentali-
             ties ("U.S. Government securities"); corporate debt securities,
             including convertible securities and corporate commercial paper;
             mortgage-backed and other asset-backed securities; inflation-in-
             dexed bonds issued by both governments and corporations; struc-
             tured notes, catastrophe bonds, including hybrid or "indexed"
             securities, and loan participations; delayed funding loans and
             revolving credit facilities; bank certificates of deposit, fixed
             time deposits and bankers' acceptances; repurchase agreements and
             reverse repurchase agreements; debt securities issued by states or
             local governments and their agencies, authorities and other
             instrumentalities; obligations of foreign governments or their
             subdivisions, agencies and instrumentalities; and obligations of
             international agencies or supranational entities. Fixed income
             securities may have fixed, variable, or floating      

6 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            rates of interest, including rates of interest that vary inversely
            at a multiple of a designated or floating rate, or that vary ac-
            cording to changes in relative values of currencies. Each of the
            Fixed Income Funds may hold different percentages of its assets in
            these various types of securities, and each Fund, except the Money
            Market Fund, may invest all of its assets in derivative instru-
            ments or in mortgage- or asset-backed securities. Each of the
            Fixed Income Funds, except the Money Market Fund, may adhere to
            its investment policy by entering into a series of purchase and
            sale contracts or utilizing other investment techniques by which
            it may obtain market exposure to the securities in which it pri-
            marily invests.
               In addition, each of the Fixed Income Funds may lend its port-
            folio securities to brokers, dealers and other financial institu-
            tions in order to earn income. Each of the Fixed Income Funds may
            purchase and sell options and futures subject to the limits dis-
            cussed below, engage in credit spread trades and enter into for-
            ward foreign currency contracts.
               Each of the Foreign Bond, Global Bond, Global Bond II, 
            International Bond, Emerging Markets Bond, Emerging Markets Bond II
            and Real Return Bond Funds will normally invest at least 80% of its
            total assets in "bonds." For this purpose, each of these Funds
            considers the various types of debt or fixed income securities in
            which it invests, as specifically described elsewhere in this Pro-
            spectus, to be "bonds" as referenced in that Fund's name. The use of
            this name is not meant to restrict a Fund's investment to the narrow
            category of debt securities that are formally called "bonds."
                 As a non-fundamental, operating policy, the Advisor intends to
            use foreign currency-related derivative instruments (currency
            futures and related options, currency options, forward contracts and
            swap agreements) in an effort to hedge foreign currency risk with
            respect to at least 75% of the assets of the Fixed Income Funds
            (other than the Global Bond, Emerging Markets Bond and Emerging
            Markets Bond II Funds) denominated in currencies other than the U.S.
            dollar. There can be no assurance that the Advisor will be
            successful in doing so. The active use of currency derivatives
            involves transaction costs which may adversely effect yield and
            return.
 
            The compositions of the Fixed Income Funds differ as follows:
 
            LONG-TERM U.S. GOVERNMENT FUND invests in a diversified portfolio
            of primarily U.S. Government securities, which may be represented
            by futures contracts (including related options) with respect to
            such securities, and options on such securities, when the Advisor
            deems it appropriate to do so. The Fund will have a minimum aver-
            age portfolio duration of eight years. For point of reference, the
            dollar-weighted average portfolio maturity of the Fund is normally
            expected to be more than ten years. The total rate of return is
            expected to exhibit more volatility than that of the other Fixed
            Income Funds due to the greater investment risk normally associ-
            ated with longer duration investments. The Long-Term U.S. Govern-
            ment Fund's investments in fixed income securities are limited to
            those of U.S. dollar-denominated securities of domestic and for-
            eign issuers that are rated at least A by Moody's Investors Serv-
            ice, Inc. ("Moody's") or Standard & Poor's Corporation ("S&P")
            (or, if unrated, determined by the Advisor to be of comparable
            quality). In addition, the Fund will not acquire a security if, as
            a result, more than 10% of the Fund's total assets would be in-
            vested in securities rated below Aa by Moody's or below AA by S&P,
            or if more than 25% of the Fund's total assets would be invested
            in securities rated Aa by Moody's or AA by S&P.
     
            MUNICIPAL BOND FUND seeks high current income exempt from federal
            income tax, consistent with preservation of capital. Capital
            appreciation is a secondary objective. The Fund seeks its objectives
            by investing in debt securities whose interest is, in the opinion of
            bond counsel for the issuer at the time of issuance, exempt from
            federal income tax ("Municipal Bonds"). Municipal Bonds generally
            are issued by states and local governments and their agencies,
            authorities and other instrumentalities. It is a policy of the Fund
            that, under normal market conditions, at least 80% of its net assets
            will be invested in Municipal Bonds. The Fund may invest up to 20%
            of its net assets in U.S. Government securities, money market in-
            struments and/or "private activity" bonds. Under normal circum-
            stances, the average portfolio duration of the Municipal Bond Fund
            will vary within a three-to ten-year time frame, based on the Ad-
            visor's forecast for interest rates.
         
                                                 
                                               August 1, 1998 Prospectus 7     

<PAGE>
 
               The Fund may invest up to 10% of its net assets in Municipal
            Bonds or "private activity" bonds which are rated below Baa by
            Moody's or BBB by S&P but which are rated at least Ba by Moody's
            or BB by S&P (or, if unrated, determined by the Advisor to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings."
 
            EMERGING MARKETS BOND FUND invests in a portfolio of fixed income
            securities denominated in foreign currencies and the U.S. dollar.
            Under normal market conditions, the Fund will invest at least 80%
            of its assets in fixed income securities of issuers that economi-
            cally are tied to countries with emerging securities markets. The
            Fund may invest up to 20% of its assets in other types of fixed
            income instruments, including securities of issuers located in, or
            securities denominated in currencies of, countries with developed
            foreign securities markets. The Fund also may invest up to 10% of
            its assets in shares of investment companies that invest primarily
            in emerging market debt securities. The average portfolio duration
            of the Fund will vary based on the Advisor's view of the potential
            for total return offered by a particular duration strategy and,
            under normal market conditions, is not expected to exceed eight
            years.
               The Advisor has broad discretion to identify and invest in
            countries that it considers to qualify as emerging securities mar-
            kets. However, the Advisor generally considers an emerging securi-
            ties market to be one located in any country that is defined as an
            emerging or developing economy by any of the following: the Inter-
            national Bank for Reconstruction and Development (i.e., the World
            Bank), including its various offshoots, such as the International
            Finance Corporation, or the United Nations or its authorities. The
            Fund's investments in emerging market fixed income securities may
            be represented by futures contracts (including related options)
            with respect to such securities, options on such securities, eq-
            uity securities (including common stocks) upon the conversion of
            convertible securities, or securities the return on which is de-
            rived primarily from emerging securities markets, when the Advisor
            deems it appropriate to do so.
               The Fund emphasizes countries with relatively low gross na-
            tional product per capita and with the potential for rapid eco-
            nomic growth. The Advisor will select the Fund's country and cur-
            rency composition based on its evaluation of relative interest
            rates, inflation rates, exchange rates, monetary and fiscal poli-
            cies, trade and current account balances, and any other specific
            factors the Advisor believes to be relevant. The Fund likely will
            concentrate its investments in Asia, Africa, the Middle East,
            Latin America and the developing countries of Europe. Accordingly,
            the Fund will be particularly susceptible to the effects of polit-
            ical and economic developments in these regions. This effect may
            be exacerbated by a relative scarcity of issuers in certain of
            these markets, which may result in the Fund being highly concen-
            trated in a small number of issuers. For a further discussion of
            the special risks of investing in foreign and emerging market
            countries, see "Characteristics and Risks of Securities and In-
            vestment Techniques--Foreign Securities."
               The Fund may invest substantially all of its assets in securi-
            ties rated below investment grade but rated B or higher by Moody's
            or S&P (or, if unrated, determined by the Advisor to be of compa-
            rable quality). Such securities are colloquially referred to as
            "junk bonds." While these securities generally provide greater po-
            tential opportunity for capital appreciation and higher yields
            than investments in higher rated securities, they also entail
            greater risk, including the possibility of default or bankruptcy
            of the issuer of the securities. Risk of default or bankruptcy may
            be greater in periods of economic uncertainty or recession, as the
            issuers may be less able to withstand general economic downturns
            affecting the regions in which the Fund invests. The Advisor seeks
            to reduce risk through diversification, credit analysis and atten-
            tion to current developments and trends in emerging market econo-
            mies and markets. The value of all fixed income securities, in-
            cluding those held by the Fund, can be expected to change in-
            versely with interest rates. For a further discussion of the spe-
            cial risks of investing in lower rated securities, see "Character-
            istics and Risks of Securities and Investment Techniques--High
            Yield Securities ("Junk Bonds")."
 
            EMERGING MARKETS BOND FUND II has the same policies as the
            Emerging Markets Bond Fund, except that it is only available to
            private account clients of PIMCO.

            FOREIGN BOND FUND invests in a portfolio of fixed income securi-
            ties primarily denominated in major foreign currencies and baskets
            of foreign currencies (such as the European Currency Unit, or
            "ECU"). The Advisor will invest the assets of

8 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 

            the Fund in a number of international bond markets so that, under
            normal circumstances, the Fund will invest at least 85% of its as-
            sets in securities of issuers located outside the United States,
            representing at least three foreign countries, which may be repre-
            sented by futures contracts (including related options) with re-
            spect to such securities, and options on such securities, when the
            Advisor deems it appropriate to do so. The Fund may invest up to
            10% of its assets in fixed income securities that are rated below
            investment grade but rated B or higher by Moody's or S&P (or, if
            unrated, determined by the Advisor to be of comparable quality).
            Securities rated below investment grade may be referred to collo-
            quially as "junk bonds." For information on the risks associated
            with investments in securities rated below investment grade, see
            "Appendix B--Description of Securities Ratings." The average port-
            folio duration of this Fund will normally vary within a three- to
            six-year time frame.
 
            GLOBAL BOND FUND invests in a portfolio of fixed income securities
            denominated in major currencies, baskets of foreign currencies
            (such as the ECU), and the U.S. dollar. Under normal circumstances,
            at least 65% of the Fund's assets will be invested in fixed income
            securities of issuers located in at least three countries (one of
            which may be the United States), which may be represented by
            futures contracts (including related options) with respect to such
            securities, and options on such securities, when the Advisor deems
            it appropriate to do so. Depending on the Advisor's current opinion
            as to the proper allocation of assets among domestic and foreign
            issuers, investments in the securities of issuers located outside
            the United States will normally vary between 25% and 75% of the
            Fund's assets. The Fund may invest up to 10% of its assets in fixed
            income securities that are rated below investment grade but rated B
            or higher by Moody's or S&P (or, if unrated, determined by the
            Advisor to be of comparable quality). For information on the risks
            associated with investments in securities rated below investment
            grade, see "Appendix B--Description of Securities Ratings." The
            average portfolio duration of this Fund will normally vary within a
            three- to six-year time frame.

            GLOBAL BOND FUND II has the same policies as the Global Bond Fund,
            except as set forth below. The Global Bond Fund II expects to hedge
            its foreign currency exposure so that generally no more than 25% of
            the Fund's total net assets will be invested in unhedged foreign
            currency-denominated securities. The Global Bond Fund II may not
            borrow in excess of 10% of the value of its total assets and then
            only from banks as a temporary measure to facilitate the meeting of
            redemption requests (not for leverage), or for extraordinary or
            emergency purposes. The Global Bond Fund II may only engage in short
            sales that are "against the box," and may not loan its portfolio
            securities if the market value exceeds 25% of the total assets of
            the Fund. In addition, the Global Bond Fund II is subject to
            different fundamental and non-fundamental investment restrictions
            than the Global Bond Fund. See "Investment Restrictions" in this
            Prospectus and in the Statement of Additional Information.
              The Foreign Bond Fund differs from the Global Bond Fund and Global
            Bond Fund II primarily in the extent to which assets are invested in
            the securities of issuers located outside the United States. The
            Advisor will select these Funds' foreign country and currency
            compositions based on an evaluation of relative interest rates,
            exchange rates, monetary and fiscal policies, trade and current
            account balances, and any other specific factors the Advisor
            believes to be relevant.
 
            INTERNATIONAL BOND FUND invests in a portfolio of fixed income
            securities denominated in major foreign currencies, baskets of
            foreign currencies, and the U.S. dollar. The International Bond Fund
            is available only to private account clients of PIMCO. The Adviser
            will invest the assets of the Fund in a number of international bond
            markets so that, under normal conditions, the Fund will invest at
            least 65% of its assets in fixed income securities of foreign
            issuers representing at least three foreign countries or currencies,
            which may be represented by futures contracts (including related
            options) with respect to such securities, and options on such
            securities, when the Adviser deems it appropriate to do so. The
            International Bond Fund will invest only in investment grade
            securities, i.e., in securities rated at least Baa by Moody's or BBB
            by S&P (or, if unrated, deemed by the Adviser to be of comparable
            quality). The average portfolio duration of this Fund will vary
            based on the strategy currently being used by the Adviser in
            managing the assets of the Fund within the overall PIMCO private
            account management program, but is normally not expected to exceed
            eight years. The Adviser will select the Fund's foreign country and
            currency composition based on its evaluation of relative interest
            rates, inflation rates, exchange rates, monetary and fiscal
            policies, trade and current account balances, and any other specific
            factors the Adviser believes to be relevant.

            HIGH YIELD FUND invests under normal circumstances at least 65% of
            its assets in a diversified portfolio of fixed income securities
            rated lower than Baa by Moody's or lower than BBB by S&P but rated
            at least B by Moody's or S&P (or, if unrated, determined by the
            Advisor to be of comparable quality). The remainder of the Fund's
            assets may be invested in investment grade fixed income securities
            (i.e., securities rated at least Baa by Moody's or BBB by S&P, or,
            if unrated, deemed by the Advisor to be of comparable quality).
            The average portfolio duration of this Fund will normally vary
            within a two- to six-year time frame depending on the Advisor's
            view of the potential for total return offered by a particular du-
            ration strategy. The Fund may invest in securities of foreign is-
            suers, but only those that are U.S. dollar-denominated. The Fund
            may also engage in hedging strategies involving equity options.
               Investments in high yield securities, while generally providing
            greater potential opportunity for capital appreciation and higher
            yields than investments in higher rated securities, also entail
            greater risk, including the possibility of default or bankruptcy
            of the issuer of such securities. Risk of default or bankruptcy
            may be greater in periods of economic uncertainty or recession, as
            the issuers of high yield securities may be less able to withstand
            general economic downturns. The Advisor seeks to reduce risk
            through diversification, credit analysis and attention to current
            developments and trends in both the economy and financial markets.
            The value of all fixed income securities, including those held by
            the Fund, can be expected to change inversely with interest rates.
            For a further discussion of the special risks of investing in
            lower rated securities, see "Characteristics and Risks of Securi-
            ties and Investment Techniques--High Yield Securities ("Junk
            Bonds")."
 
            TOTAL RETURN FUND invests under normal circumstances at least 65%
            of its assets in a diversified portfolio of fixed income securi-
            ties of varying maturities. The average portfolio duration of this
            Fund will normally vary within a three- to six-

                                                     
                                               August 1, 1998 Prospectus 9     
<PAGE>
 
            year time frame based on the Advisor's forecast for interest
            rates. The Fund may invest up to 10% of its assets in fixed income
            securities that are rated below investment grade but rated B or
            higher by Moody's or S&P (or, if unrated, determined by the Advi-
            sor to be of comparable quality). For information on the risks as-
            sociated with investments in securities rated below investment
            grade, see "Appendix B--Description of Securities Ratings." The
            Fund may also invest up to 20% of its assets in securities denomi-
            nated in foreign currencies, and may invest beyond this limit in
            U.S. dollar-denominated securities of foreign issuers. Portfolio
            holdings will be concentrated in areas of the bond market (based
            on quality, sector, coupon or maturity) which the Advisor believes
            to be relatively undervalued. The total rate of return for this
            Fund is expected to exhibit less volatility than that of the Long-
            Term U.S. Government Fund because its duration will normally be
            shorter.
 
            TOTAL RETURN FUND II has the same policies as the Total Return Fund,
            except that its investments in fixed income securities are limited
            to those of domestic (U.S.) issuers that are rated at least Baa by
            Moody's or BBB by S&P (or, if unrated, determined by the Adviser to
            be of comparable quality).

            TOTAL RETURN FUND III has the same policies as the Total Return
            Fund, except that it limits its investments with respect to certain
            socially sensitive issues in the same manner as the Low Duration
            Fund III.

            COMMERCIAL MORTGAGE SECURITIES FUND invests at least 65% of its
            assets in commercial mortgage-backed securities rated at least Baa
            by Moody's or BBB by S&P (or, if unrated, determined by the Adviser
            to be of comparable quality). The Fund also may invest up to 35% of
            its assets in lower-rated securities (but rated at least B, or, if
            unrated, determined by the Adviser to be of comparable quality) if
            such securities are considered by the Adviser to have attractive
            investment characteristics. For information on the risks associated
            with investments in securities rated below investment grade, see
            "Appendix B--Description of Securities Ratings." The average
            portfolio duration of this Fund will normally vary within a three-
            to eight-year time frame depending on the Adviser's view of the
            potential for total return offered by a particular duration
            strategy. The Fund may invest in securities of foreign issuers, but
            only those that are U.S. dollar-denominated.

            LOW DURATION MORTGAGE FUND invests under normal circumstances at
            least 80% of its assets in a diversified portfolio of mortgage-
            related securities. The Fund will not acquire a security if, as a
            result, more than 10% of the Fund's total assets would be invested
            in securities rated below Aaa by Moody's or AAA by S&P, subject to a
            minimum rating of Baa by Moody's or BBB by S&P (or, if unrated,
            determined by the Adviser to be of comparable quality). The average
            portfolio duration of this Fund will normally vary within a one- to
            three-year time frame based on the Adviser's view of the potential
            for total return offered by a particular duration strategy. The Fund
            may invest without limit in U.S. dollar-denominated securities of
            foreign issuers. The total rate of return and share price for this
            Fund are expected to exhibit less volatility than that of the Total
            Return Mortgage Fund because its duration will be shorter.
               
            TOTAL RETURN MORTGAGE FUND has the same policies as the Low Duration
            Mortgage Fund, except that its average portfolio duration will
            normally vary within a two- to six-year time frame based on the
            Adviser's view of the potential for total return offered by a
            particular duration strategy.     
               
            REAL RETURN BOND FUND invests under normal circumstances at least
            65% of its total assets in inflation-indexed bonds issued by U.S.
            and foreign governments, their agencies or instrumentalities. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Advisor to be of
            comparable quality). The Fund may invest up to 35% of its assets in
            other types of fixed income instruments, including securities
            denominated in foreign currencies, (and the Fund may also invest
            beyond this limit in U.S. dollar-denominated securities of foreign
            issuers).                 
               Inflation-indexed bonds are fixed income securities whose prin-
            cipal value is periodically adjusted according to the rate of in-
            flation. Such bonds generally are issued at an interest rate lower
            than non-inflation related bonds, but are expected to retain their
            value against inflation over time. For a more complete discussion
            of inflation-indexed bonds, including the risks associated with
            investing in such securities, see "Characteristics and Risks of
            Securities and Investment Techniques--Inflation-Indexed Bonds."
            See "Taxes" for information about the possible tax consequences of
            investing in the Fund and in inflation-indexed bonds.
               In managing fixed income securities, one of the principal tools
            generally used by the Advisor is "duration," which is a measure of
            the expected life of a fixed income security on a present value
            basis, incorporating a bond's yield, coupon interest payments, fi-
            nal maturity and call features. See "Appendix A--Description of
            Duration." Because of the unique features of inflation-indexed
            bonds, the Advisor utilizes a modified form of duration for the
            Real Return Bond Fund ("modified real duration") which measures
            price changes in such bonds as a result of changes in real, rather
            than nominal, interest rates. Although there is no limit on the
            modified real duration of the Real Return Bond Fund, it is ex-
            pected that the average modified real duration of the Fund will
            normally vary approximately with the range of the average modified
            real duration of all inflation-indexed bonds issued by the U.S.
            Treasury in the aggregate.
 
            LOW DURATION FUND invests in a diversified portfolio of fixed in-
            come securities of varying maturities. The average portfolio dura-
            tion of this Fund will normally vary within a one- to three-year
            time frame based on the Advisor's forecast for interest rates. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Advisor to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see "Ap-
            pendix B--Description of Securities Ratings." The Fund may invest
            up to 20% of its assets in securities denominated in foreign cur-
            rencies, and may invest beyond this limit in U.S. dollar-denomi-
            nated securities of foreign issuers. The total rate of return for
            this Fund is expected to exhibit less volatility than that of the
            Total Return Fund because its duration will be shorter.
 
            LOW DURATION FUND II has the same policies as the Low Duration Fund,
            except that its investments in fixed income securities are limited
            to those of domestic (U.S.) issuers that are rated at least A by
            Moody's or S&P (or, if unrated, determined by the Adviser to be of
            comparable quality).

            LOW DURATION FUND III has the same policies as the Low Duration
            Fund, except that it limits its investments with respect to certain
            socially sensitive issues. As a matter of non-fundamental policy,
            the Fund will not invest in the securities of any issuer determined
            by the Adviser to be engaged principally in the provision of
            healthcare services, the manufacture of alcoholic beverages, tobacco
            products, pharmaceuticals or military equipment, or the operation of
            gambling casinos. The Fund will also avoid, to the extent possible
            on the basis of information available to the Adviser, the purchase
            of securities of issuers engaged in the production or trade of
            pornographic materials. An issuer will be deemed to be principally
            engaged in an activity if it derives more than 10% of its gross
            revenues from such activities.

            MODERATE DURATION FUND invests in a diversified portfolio of fixed
            income securities of varying maturities. The average portfolio
            duration of this Fund will normally vary with a two- to five-year
            time frame based on the Adviser's forecast for interest rates. The
            Fund may invest up to 10% of its assets in fixed income securities
            that are rated below investment grade but rated B or higher by
            Moody's or S&P (or, if unrated, determined by the Adviser to be of
            comparable quality). For information on the risks associated with
            investments in securities rated below investment grade, see
            "Appendix B--Description of Securities Ratings." The Fund may invest
            up to 20% of its assets in securities denominated in foreign
            currencies, and may invest beyond this limit in U.S. dollar-
            denominated securities of foreign issuers. The total rate of return
            for this Fund is expected to exhibit less volatility than that of
            the Total Return Fund because its duration will normally be shorter.
            However, the total rate of return for this Fund is expected to
            exhibit more volatility than that of the Low Duration Fund because
            its duration will normally be longer.

            SHORT-TERM FUND invests in a diversified portfolio of fixed income
            securities of varying maturities. The average portfolio duration
            of this Fund will normally not exceed one year. The Fund may in-
            vest up to 10% of its assets in fixed income securities that are
            rated below investment grade (rated below Baa by Moody's or BBB by
            S&P) but rated B or higher
 
10 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            by Moody's or S&P (or, if unrated, determined by the Advisor to be
            of comparable quality). For information on the risks associated
            with investments in securities rated below investment grade, see
            "Appendix B--Description of Securities Ratings." The Fund may in-
            vest up to 5% of its assets in securities denominated in foreign
            currencies, and may invest beyond this limit in U.S. dollar-denom-
            inated securities of foreign issuers.
 
            MONEY MARKET FUND seeks maximum current income consistent with the
            preservation of capital and daily liquidity. It attempts to
            achieve this objective by investing at least 95% of its total as-
            sets, measured at the time of investment, in a diversified portfo-
            lio of the highest quality money market securities. The Fund may
            also invest up to 5% of its total assets, measured at the time of
            investment, in money market securities that are in the second-
            highest rating category for short-term obligations. The Fund's in-
            vestments in securities will be limited to U.S. dollar-denominated
            securities that mature in 397 days or less from the date of pur-
            chase. The Fund may invest in the following: obligations of the
            U.S. Government (including its agencies and instrumentalities);
            short-term corporate debt securities of domestic and foreign cor-
            porations; obligations of domestic and foreign commercial banks,
            savings banks, and savings and loan associations; and commercial
            paper. The Fund may invest more than 25% of its total assets in
            securities or obligations issued by U.S. banks. The dollar-
            weighted average portfolio maturity of the Fund will not exceed 90
            days.
               The Money Market Fund may invest only in U.S. dollar-denomi-
            nated money market instruments that present minimal credit risk
            and, with respect to at least 95% of its total assets, measured at
            the time of investment, that are of the highest quality. The Advi-
            sor will make a determination as to whether a security presents
            minimal credit risk under procedures adopted by the Board of
            Trustees. A money market instrument will be considered to be of
            the highest quality (1) if rated in the highest rating category
            (i) by any two nationally recognized statistical rating organiza-
            tions ("NRSROs") (e.g., Aaa or Prime-1 by Moody's, AAA or A-1 by
            S&P), or, (ii) if rated by only one NRSRO, by that NRSRO, and
            whose acquisition is approved or ratified by the Board of Trust-
            ees; (2) if unrated but issued by an issuer that has short-term
            debt obligations of comparable maturity, priority, and security,
            and that are rated in the highest rating category by (i) any two
            NRSROs or, (ii) if rated by only one NRSRO, by that NRSRO, and
            whose acquisition is approved or ratified by the Board of Trust-
            ees; or (3) an unrated security that is of comparable quality to a
            security rated in the highest rating category as determined by the
            Advisor and whose acquisition is approved or ratified by the Board
            of Trustees. With respect to no more than 5% of its total assets,
            measured at the time of investment, the Fund may also invest in
            money market instruments that are in the second-highest rating
            category for short-term debt obligations (e.g., rated Aa or Prime-
            2 by Moody's or AA or A-2 by S&P). A money market instrument will
            be considered to be in the second-highest rating category under
            the criteria described above with respect to instruments consid-
            ered to be of the highest quality, as applied to instruments in
            the second-highest rating category. See "Appendix B--Description
            of Securities Ratings" for a description of Moody's and S&P's rat-
            ings applicable to fixed income securities.
               The Money Market Fund may not invest more than 5% of its total
            assets, measured at the time of investment, in securities of any
            one issuer that are of the highest quality, except that (1) the
            Fund may invest more than 5% of its total assets in the securities
            of a single issuer if rated in the highest rating category for a
            period of up to three business days after purchase, provided that
            the Fund may not make more than one investment at a time in accor-
            dance with this exception, and (2) this limitation shall not apply
            to U.S. Government securities and repurchase agreements with re-
            spect thereto. The Fund may not invest more than the greater of 1%
            of its total assets or $1,000,000, measured at the time of invest-
            ment, in securities of any one issuer that are in the second-high-
            est rating category, except that this limitation shall not apply
            to U.S. Government securities. In the event that an instrument ac-
            quired by the Fund is downgraded or otherwise ceases to be of the
            quality that is required for securities purchased by the Fund, the
            Advisor, under procedures approved by the Board of Trustees (or
            the Board of Trustees itself if the Advisor becomes aware an
            unrated security is downgraded below high quality and the Advisor
            does not dispose of the security or such security does not mature
            within five business days) shall promptly reassess whether such
            security presents minimal credit risk and determine whether to re-
            tain the instrument.
                                                   
                                               August 1, 1998 Prospectus 11     
<PAGE>
 
EQUITY FUND The Equity Funds are the PIMCO StocksPLUS Fund and the PIMCO 
DESCRIP-    StocksPLUS Short Strategy Fund. The investment objective of PIMCO
TIONS       StocksPLUS Fund is to seek to achieve a total return which exceeds
            the total return performance of the S&P 500. The investment
            objective of the PIMCO StocksPLUS Short Strategy Fund is to seek
            total return through the implementation of short investment
            positions on the S&P 500.
               Each of the Equity Funds invests in common stocks, options,
            futures, options on futures and swaps consistent with its portfolio
            management strategy as set forth below.
               Assets not invested in equity securities may be invested in
            securities eligible for purchase by the Fixed Income Funds. Each of
            the Equity Funds may invest up to 10% of its assets in fixed income
            securities that are below "investment grade," i.e., rated below Baa
            by Moody's or BBB by S&P, but at least B (or, if unrated, determined
            by the Advisor to be of comparable quality). In addition, each of
            the Equity Funds may lend its portfolio securities to brokers,
            dealers and other financial institutions in order to earn income.
            Each of the Equity Funds may also invest all of its assets in
            derivative instruments, as described under "Characteristics of
            Securities and Investment Techniques--Derivative Instruments." Each
            of the Equity Funds may invest up to 20% of its assets in securities
            of foreign issuers, may purchase and sell options and futures on 
            foreign currencies, and may enter into forward foreign currency con-
            tracts.
               The Equity Funds differ in composition or strategy as follows:

            STOCKSPLUS FUND. StocksPLUS is the name of a proprietary portfolio
            management strategy which utilizes S&P 500 derivatives in addition
            to or in place of S&P 500 stocks to equal or exceed the performance
            of the S&P 500. The Advisor expects that under normal market
            conditions, the Fund will invest substantially all of its assets in
            S&P 500 derivatives, backed by a portfolio of fixed income
            securities. The Advisor will actively manage the fixed income assets
            serving as cover for derivatives, as well as any other fixed income
            assets held by the Fund, with a view toward enhancing the Fund's
            total return investment performance, subject to an overall
            portfolio duration which is normally not expected to exceed one
            year. See "Appendix A--Description of Duration."
               The S&P 500 is composed of 500 selected common stocks, most of
            which are listed on the New York Stock Exchange. S&P chooses the
            stocks to be included in the S&P 500 solely on a statistical ba-
            sis. The weightings of stocks in the index are based on each
            stock's relative total market value, that is, its market price per
            share times the number of shares outstanding. Stocks represented
            currently in the S&P 500 represent approximately two-thirds of the
            total market value of all U.S. common stocks. The Fund is neither
            sponsored by nor affiliated with S&P. The Fund will seek to remain
            invested in S&P 500 derivatives or S&P 500 stocks even when the
            S&P 500 is declining.
               When S&P 500 derivatives appear to be overvalued relative to
            the S&P 500, the Fund may invest up to 100% of its assets in a
            "basket" of S&P 500 stocks. The composition of this basket will be
            determined by standard statistical techniques that analyze the
            historical correlation between the return of every stock currently
            in the S&P 500 and the return on the S&P 500 itself. The Advisor
            may employ fundamental stock analysis only to choose among stocks
            that have already satisfied the statistical correlation tests.
            Stocks chosen for the Fund are not limited to those with any par-
            ticular weighting in the S&P 500.
               Positions in S&P 500 futures and options on futures will be en-
            tered into only to the extent they constitute permissible posi-
            tions for the Fund according to applicable rules of the Commodity
            Futures Trading Commission ("CFTC"). From time to time, the Advi-
            sor may be constrained in its ability to use S&P 500 derivatives
            either by requirements of the Internal Revenue Code or by an unan-
            ticipated inability to close out positions when it would be most
            advantageous to do so. A large number of investors use S&P 500 de-
            rivatives for both hedging and speculative purposes, and although
            generally this helps guarantee a liquid market in those instru-
            ments, at times liquidity may be limited. For more information about
            S&P 500 derivatives, see "Characteristics and Risks of Securities
            and Investment Techniques--Derivative Instruments."
               
               To the extent that the Fund invests in S&P 500 derivatives
            backed by a portfolio of fixed income securities, under certain
            conditions, generally in a market where the value of both S&P 500
            derivatives and fixed income securities are declining, the Fund
            may experience greater losses than would be the case if it were to
            invest directly in a portfolio of S&P 500 stocks.     

            STOCKSPLUS SHORT STRATEGY FUND invests primarily in S&P 500 short
            positions such that the Fund's net asset value is generally expected
            to vary inversely to the value of the S&P 500. The Fund is designed
            for investors seeking to take advantage of declines in the value of
            the S&P 500, or investors wishing to hedge existing long equity
            positions. The Fund will generally realize gains only when the price
            of the S&P 500 is declining. When the S&P 500 is rising, the Fund
            will incur a loss.
               The Fund will maintain short positions through the use of a
            combination of S&P derivatives, including options, futures and swap
            agreements. All S&P 500 derivatives will be covered by the
            maintenance of a segregated account consisting of assets determined
            to be liquid by the Adviser in accordance with procedures
            established by the Board of Trustees, or through the maintenance of
            offsetting positions. It is anticipated that the Fund will generally
            remain fully invested in S&P 500 short positions at all times, even
            during periods when the S&P 500 is rising. However, the Fund may
            purchase call options on S&P 500 futures contracts from time to time
            in an effort to limit the total potential decline in the Fund's net
            asset value. There can be no assurance that the use of such call
            options would be effective in limiting the potential decline in net
            asset value of the Fund.
               The Adviser will actively manage the fixed income portion of the
            Fund's investment portfolio that is used as coverage for S&P 500
            derivatives in an attempt to provide incremental returns. Thus,
            there will not be a perfect inverse correlation between the
            performance of the S&P 500 and the performance of the Fund. A
            perfect inverse correlation would exist if the net asset value of
            the Fund, including the value of its dividend and capital gains
            distributions, increased in exact proportion to decreases in the S&P
            500 (or decreased in exact proportion to increases in the S&P 500).
            Rather, because of the  Adviser's management of the fixed income
            securities that are held by the Fund as cover for the Fund's short
            positions, it is expected that, if the value of the S&P 500 were to
            decrease by 10%, for example, the amount by which the Fund's net
            asset value would increase would be an amount slightly in excess of
            10%. Conversely, an increase in the S&P 500 of 10% would result in a
            loss to the Fund of slightly less than this amount. There can be no
            assurance that the use of such active fixed income management
            techniques will produce the intended results.

BALANCED    STRATEGIC BALANCED FUND has as its investment objective the 
FUND        maximization of total return, consistent with preservation of 
            capital and prudent investment management. In seeking to achieve
            this objective, the Fund invests in the securities eligible for
            purchase by the StocksPLUS Fund and the Total Return Fund. The
            percentage of the Fund's assets allocated to equity or fixed income
            exposure will vary in accordance with an asset allocation
            methodology developed by the Adviser. The methodology builds upon
            the Adviser's long-standing process of economic forecasting of
            business cycle stages by applying to this process a disciplined
            asset allocation model which employs certain statistical variance
            techniques. Depending on the outcome of this asset allocation
            methodology, the Fund's equity exposure will vary between 45% and
            75% of its total assets, and its fixed income exposure will vary
            between 25% and 55%. There can be no assurance that the Adviser's
            asset allocation methodology will be successful.

TOTAL       The "total return" sought by certain of the Funds will consist of
RETURN AND  interest and dividends from underlying securities, capital appre-
REAL RETURN ciation reflected in unrealized increases in value of portfolio
            securities (realized by the shareholder only upon selling shares),
            or realized from the purchase and sale of securities and use of
            futures and options, or gains from favorable changes in foreign
            currency exchange rates. Generally, over the long term, the total
            return obtained by a portfolio investing primarily in fixed income
            securities is not expected to be as great as that obtained by a
            portfolio that invests primarily in equity securities. At the same
            time, the market risk and price volatility of a fixed income port-
            folio is expected to be less than that of an equity portfolio, so
            that a fixed income portfolio is generally considered to be a more
            conservative investment. The change in market value of fixed in-
            come securities (and therefore their capital appreciation or de-
            preciation) is largely a function of changes in the current level
            of interest rates. Generally, when interest rates
 
12 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            are falling, a portfolio with a shorter duration will not generate
            as high a level of total return as a portfolio with a longer dura-
            tion. Conversely, when interest rates are rising, a portfolio with
            a shorter duration will generally outperform longer duration port-
            folios. When interest rates are flat, shorter duration portfolios
            generally will not generate as high a level of total return as
            longer duration portfolios (assuming that long-term interest rates
            are higher than short-term rates, which is commonly the case).
            With respect to the composition of any fixed income portfolio, the
            longer the duration of the portfolio, the greater the anticipated
            potential for total return, with, however, greater attendant mar-
            ket risk and price volatility than for a portfolio with a shorter
            duration. The market value of fixed income securities denominated
            in currencies other than the U.S. dollar also may be affected by
            movements in foreign currency exchange rates.
               The change in market value of equity securities (and therefore
            their capital appreciation or depreciation) may depend upon a num-
            ber of factors, including: conditions in the securities markets,
            the business success of the security's issuer, changing interest
            rates, real or perceived economic and competitive industry condi-
            tions, and foreign currency exchange rates. Historically, the to-
            tal return performance of equity-oriented portfolios has generally
            been greater over the long term than fixed income portfolios. How-
            ever, the market risk and price volatility of an equity portfolio
            is generally greater than that of a fixed income portfolio, and is
            generally considered to be a more aggressive investment.
               "Real Return," or "Inflation Adjusted Return," as referenced in
            the name and investment objective of the Real Return Bond Fund, is
            a measure of the change in purchasing power of money invested in a
            particular instrument after adjusting for inflation. An investment
            in a security generating a high nominal return (such as a typical
            U.S. Government Treasury bond) may not generate a high real return
            once inflation is considered. For example, an instrument generat-
            ing a 9% nominal return at a time when inflation is 6% has a real
            return of approximately 3%; that is, the purchasing power of the
            money invested in that instrument would only increase by approxi-
            mately 3%. On the other hand, an inflation-indexed instrument gen-
            erating a 5% real return would generate a 5% increase in purchas-
            ing power regardless of the rate of inflation. As stated above,
            the investment objective of the Fund is to seek to achieve maximum
            real return. The total return (not adjusted for inflation) at-
            tained by this Fund may be less than the total return attained by
            other of the Funds that do not invest primarily in inflation-in-
            dexed securities.
               In the case of inflation-indexed bonds, changes in market value
            are tied to the relationship between nominal interest rates and
            the rate of inflation. If inflation were to rise at a faster rate
            than nominal interest rates, real interest rates might decline,
            leading to an increase in value of inflation-indexed bonds. In
            contrast, if nominal interest rates increase at a faster rate than
            inflation, real interest rates might increase, leading to a de-
            crease in value of inflation-indexed bonds.
 
            Investment Risks and Considerations
 
            The following are some of the principal risks of investing in the
            Funds. Investors should read this Prospectus carefully for a more
            complete discussion of the risks relating to an investment in the
            Funds. The net asset value per share of any Fund may be less at
            the time of redemption than it was at the time of investment. Gen-
            erally, the value of fixed income securities can be expected to
            vary inversely with changes in prevailing interest rates, i.e., as
            interest rates rise, market value tends to decrease, and vice
            versa, although this may not be true in the case of inflation-
            indexed bonds. In addition, certain of the Funds may invest in se-
            curities rated lower than Baa by Moody's or S&P. Such securities
            carry a high degree of credit risk and are considered speculative
            by the major rating agencies.
               Certain Funds may invest in securities of foreign issuers,
            which may be subject to additional risk factors, including foreign
            currency and political risks, not applicable to securities of U.S.
            issuers. Certain of the Funds' investment techniques may involve a
            form of borrowing, which may tend to exaggerate the effect on net
            asset value of any increase or decrease in the market value of a
            Fund's portfolio and may require liquidation of portfolio posi-
            tions when it is not advantageous to do so. Certain Funds may sell
            securities short, which exposes the Fund to a risk of loss if the
            value of the security sold short should increase.

                                                     
                                              August 1, 1998 Prospectus 13     
<PAGE>
 
               All Funds (except the Money Market Fund) may use derivative in-
            struments, consisting of futures, options, options on futures, and
            swap agreements, for hedging purposes or as part of their invest-
            ment strategies. Use of these instruments may involve certain
            costs and risks, including the risk that a Fund could not close
            out a position when it would be most advantageous to do so, the
            risk of an imperfect correlation between the value of the securi-
            ties being hedged and the value of the particular derivative in-
            strument, and the risk that unexpected changes in interest rates
            may adversely affect the value of a Fund's investments in particu-
            lar derivative instruments. Unless otherwise indicated, all limi-
            tations applicable to Fund investments (as stated in this Prospec-
            tus and in the Statement of Additional Information) apply only at
            the time a transaction is entered into. Any subsequent change in a
            rating assigned by any rating service to a security (or, if
            unrated, deemed to be of comparable quality), or change in the
            percentage of Fund assets invested in certain securities or other
            instruments, or change in the average duration of a Fund's invest-
            ment portfolio, resulting from market fluctuations or other
            changes in a Fund's total assets, will not require a Fund to dis-
            pose of an investment until the Advisor determines that is practi-
            cable to sell or close out the investment without undue market or
            tax consequences to the Fund. In the event that ratings services
            assign different ratings to the same security, the Advisor will
            determine which rating it believes best reflects the security's
            quality and risk at that time, which may be the higher of the sev-
            eral assigned ratings.
               Investors should carefully consider the possible tax conse-
            quences from investing in the Real Return Bond Fund. The Fund in-
            vests primarily in securities that for tax purposes may be consid-
            ered to have been issued originally at a discount. Accordingly,
            the Fund may be required to make annual distributions to share-
            holders in excess of the cash received by the Fund in a given pe-
            riod from those investments. See "Characteristics and Risks of Se-
            curities and Investment Techniques--Inflation-Indexed Bonds" and
            "Taxes" for additional information.
               The Emerging Markets Bond, Emerging Markets Bond II, Foreign
            Bond, Global Bond, Global Bond II, International Bond, Commerical
            Mortgage Securities and Real Return Bond Funds are "non-diversified"
            for purposes of the Investment Company Act of 1940 ("1940 Act"),
            meaning that they may invest a greater percentage of their assets in
            the securities of one issuer than the other Funds. The Funds are
            still, however, subject to diversification requirements imposed by
            the Internal Revenue Code of 1986, as amended, which means that as
            of the end of each calendar quarter, a Fund may have no more than
            25% of its assets invested in the securities of a single issuer, and
            may, with respect to 50% of its assets, have no more than 5% of its
            assets invested in the securities of a single issuer. As "non-diver-
            sified" portfolios, these Funds may be more susceptible to risks
            associated with a single economic, political or regulatory occur-
            rence than a diversified portfolio might be.
               The Funds offer their shares to both retail and institutional
            investors. Institutional shareholders, some of whom also may be
            investment advisory clients of Pacific Investment Management, may
            hold large positions in certain of the Funds. Such shareholders
            may on occasion make large redemptions of their holdings in the
            Funds to meet their liquidity needs, in connection with strategic
            adjustments to their overall portfolio of investments, or for
            other purposes. Large redemptions from some Funds could require
            the Advisor to liquidate portfolio positions when it is not most
            desirable to do so. Liquidation of portfolio holdings also may
            cause a Fund to realize taxable capital gains.
 
            Characteristics and Risks of
            Securities and Investment Techniques
 
            The following describes in greater detail different types of secu-
            rities and investment techniques used by the individual Funds, and
            discusses certain concepts relevant to the investment policies of
            the Funds. Additional information about the Funds' investments and
            investment practices may be found in the Statement of Additional
            Information.
 

U.S.        U.S. Government securities are obligations of, or guaranteed by,
GOVERNMENT  the U.S. Government, its agencies or instrumentalities. The U.S.
SECURITIES  Government does not guarantee the net asset value of the Funds'
            shares. Some U.S. Government securities, such as Treasury bills,
            notes and bonds, and securities guaranteed by the Government Na-
            tional Mortgage Association
 
14 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            ("GNMA"), are supported by the full faith and credit of the United
            States; others, such as those of the Federal Home Loan Banks, are
            supported by the right of the issuer to borrow from the U.S. Trea-
            sury; others, such as those of the Federal National Mortgage Asso-
            ciation ("FNMA"), are supported by the discretionary authority of
            the U.S. Government to purchase the agency's obligations; and
            still others, such as those of the Student Loan Marketing Associa-
            tion, are supported only by the credit of the instrumentality.
            U.S. Government securities include securities that have no cou-
            pons, or have been stripped of their unmatured interest coupons,
            individual interest coupons from such securities that trade sepa-
            rately, and evidences of receipt of such securities. Such securi-
            ties may pay no cash income, and are purchased at a deep discount
            from their value at maturity. Because interest on zero coupon se-
            curities is not distributed on a current basis but is, in effect,
            compounded, zero coupon securities tend to be subject to greater
            market risk than interest-paying securities of similar maturities.
            Custodial receipts issued in connection with so-called trademark
            zero coupon securities, such as CATs and TIGRs, are not issued by
            the U.S. Treasury, and are therefore not U.S. Government securi-
            ties, although the underlying bond represented by such receipt is
            a debt obligation of the U.S. Treasury. Other zero coupon Treasury
            securities (STRIPs and CUBEs) are direct obligations of the U.S.
            Government.
 
 
CORPORATE   Corporate debt securities include corporate bonds, debentures,
DEBT        notes and other similar corporate debt instruments, including con-
SECURITIES  vertible securities. Debt securities may be acquired with warrants
            attached. Corporate income-producing securities may also include
            forms of preferred or preference stock. The rate of interest on a
            corporate debt security may be fixed, floating or variable, and
            may vary inversely with respect to a reference rate. See "Variable
            and Floating Rate Securities" below. The rate of return or return
            of principal on some debt obligations may be linked or indexed to
            the level of exchange rates between the U.S. dollar and a foreign
            currency or currencies.
               Investments in corporate debt securities that are rated below
            investment grade (rated below Baa (Moody's) or BBB (S&P)) are de-
            scribed as "speculative" both by Moody's and S&P. Such securities
            are sometimes referred to as "junk bonds," and may be subject to
            greater market fluctuations, less liquidity and greater risk of
            loss of income or principal, including a greater possibility of
            default or bankruptcy of the issuer of such securities, than are
            more highly rated debt securities. Moody's also describes securi-
            ties rated Baa as having speculative characteristics. The Advisor
            seeks to minimize these risks through diversification, in-depth
            credit analysis and attention to current developments in interest
            rates and market conditions. See "Appendix B--Description of Secu-
            rities Ratings." Investments in high yield securities are dis-
            cussed separately below under "High Yield Securities ("Junk
            Bonds")."
 
 
CONVERTIBLE Each Fund (except the Municipal Bond Fund) may invest in convert-
SECURITIES  ible securities, which may offer higher income than the common
            stocks into which they are convertible. Typically, convertible se-
            curities are callable by the company, which may, in effect, force
            conversion before the holder would otherwise choose.
               The convertible securities in which the Funds may invest con-
            sist of bonds, notes, debentures and preferred stocks which may be
            converted or exchanged at a stated or determinable exchange ratio
            into underlying shares of common stock. A Fund may be required to
            permit the issuer of a convertible security to redeem the securi-
            ty, convert it into the underlying common stock, or sell it to a
            third party. Thus, a Fund may not be able to control whether the
            issuer of a convertible security chooses to convert that security.
            If the issuer chooses to do so, this action could have an adverse
            effect on a Fund's ability to achieve its investment objectives.
               While the Fixed Income Funds intend to invest primarily in
            fixed income securities, each may invest in convertible securities
            or equity securities. While some countries or companies may be re-
            garded as favorable investments, pure fixed income opportunities
            may be unattractive or limited due to insufficient supply, legal
            or technical restrictions. In such cases, a Fund may consider eq-
            uity securities or convertible bonds to gain exposure to such in-
            vestments.
 
LOAN        Certain Funds may invest in fixed- and floating-rate loans ar-
PARTICI-    ranged through private negotiations between an issuer of debt in-
PATIONS     struments and one or more financial institutions ("lenders"). Gen-
AND         erally, the Funds' investments in loans are expected to take the
ASSIGNMENTS form of loan participations and assignments of portions of loans
            from third parties.
                                                    
                                               August 1, 1998 Prospectus 15     
<PAGE>
 
               Large loans to corporations or governments may be shared or
            syndicated among several lenders, usually banks. The Funds may
            participate in such syndicates, or can buy part of a loan, becom-
            ing a direct lender. Participations and assignments involve spe-
            cial types of risk, including limited marketability and the risks
            of being a lender. See "Illiquid Securities" for a discussion of
            the limits on a Fund's investments in loan participations and as-
            signments with limited marketability. If a Fund purchases a par-
            ticipation, it may only be able to enforce its rights through the
            lender, and may assume the credit risk of the lender in addition
            to the borrower. In assignments, the Funds' rights against the
            borrower may be more limited than those held by the original 
            lender.

DELAYED     The Funds (except the PIMCO Municipal Bond Fund) may also enter
FUNDING     into, or acquire participations in, delayed funding loans and re-
LOANS AND   volving credit facilities. Delayed funding loans and revolving
REVOLVING   credit facilities are borrowing arrangements in which the lender
CREDIT      agrees to make loans up to a maximum amount upon demand by the
FACILITIES  borrower during a specified term. A revolving credit facility dif-
            fers from a delayed funding loan in that as the borrower repays
            the loan, an amount equal to the repayment may be borrowed again
            during the term of the revolving credit facility. These commit-
            ments may have the effect of requiring a Fund to increase its in-
            vestment in a company at a time when it might not otherwise decide
            to do so (including at a time when the company's financial condi-
            tion makes it unlikely that such amounts will be repaid).
               The Funds may acquire a participation interest in delayed fund-
            ing loans or revolving credit facilities from a bank or other fi-
            nancial institution. See "Loan Participations and Assignments."
            The terms of the participation require the Fund to make a pro rata
            share of all loans extended to the borrower and entitles the Fund
            to a pro rata share of all payments made by the borrower. Delayed
            funding loans and revolving credit facilities usually provide for
            floating or variable rates of interest. To the extent that a Fund
            is committed to advance additional funds, it will at all times
            segregate assets, determined to be liquid by the Advisor in accor-
            dance with procedures established by the Board of Trustees, in an
            amount sufficient to meet such commitments.

VARIABLE    Variable and floating rate securities provide for a periodic ad-
AND         justment in the interest rate paid on the obligations. The terms
FLOATING    of such obligations must provide that interest rates are adjusted
RATE        periodically based upon an interest rate adjustment index as pro-
SECURITIES  vided in the respective obligations. The adjustment intervals may
            be regular, and range from daily up to annually, or may be event
            based, such as based on a change in the prime rate. The Money Mar-
            ket Fund may invest in a variable rate security having a stated
            maturity in excess of 397 calendar days if the interest rate will
            be adjusted, and the Fund may demand payment of principal from the
            issuer, within the period.
    
               Each of the Fixed Income Funds may invest in floating rate debt
            instruments ("floaters") and (except the Municipal Bond Fund) engage
            in credit spread trades. The interest rate on a floater is a
            variable rate which is tied to another interest rate, such as a
            money-market index or Treasury bill rate. The interest rate on a
            floater resets periodically, typically every six months. While,
            because of the interest rate reset feature, floaters provide a Fund
            with a certain degree of protection against rises in interest rates,
            a Fund will participate in any declines in interest rates as well. A
            credit spread trade is an investment position relating to a
            difference in the prices or interest rates of two securities or
            currencies, where the value of the investment position is
            determined by movements in the difference between the prices or
            interest rates, as the case may be, of the respective securities or
            currencies.      
               Each of the Fixed Income Funds (except the Money Market Fund
            and the Municipal Bond Fund) may also invest in inverse floating
            rate debt instruments ("inverse floaters"). The interest rate on
            an inverse floater resets in the opposite direction from the mar-
            ket rate of interest to which the inverse floater is indexed. An
            inverse floating rate security may exhibit greater price volatil-
            ity than a fixed rate obligation of similar credit quality. The
            Funds have adopted a policy under which no Fund will invest more
            than 5% (10% in the case of the Low Duration Mortgage and Total
            Return Mortgage Funds) of its net assets in any combination of
            inverse floater, interest only ("IO"), or principal only ("PO")
            securities. See "Mortgage-Related and Other Asset-Backed Securities"
            for a discussion of IOs and POs.
 
INFLATION-  Inflation-indexed bonds are fixed income securities whose princi-
INDEXED     pal value is periodically adjusted according to the rate of infla-
BONDS       tion. The interest rate on these bonds is generally fixed at issu-
            ance at a rate lower than typical bonds. Over the life of an in-
            flation-indexed bond, however, interest will be paid based on a
            principal value which is adjusted for inflation.
               Inflation-indexed securities issued by the U.S. Treasury will
            initially have maturities of five or ten years, although it is an-
            ticipated that securities with other maturities will be issued in
            the future. The securities will pay interest on a semi-annual ba-
            sis, equal to a fixed percentage of the inflation-adjusted princi-
            pal amount. For example, if an investor purchased an inflation-in-
            dexed bond with a par value of $1,000 and a 3% real rate of return
            coupon (payable 1.5% semi-annually), and inflation over the first
            six months were 1%, the mid-year par value of the bond would be
            $1,010 and the first semi-annual interest payment would be $15.15
            ($1,010 times 1.5%). If inflation during the second half of the
            year reached 3%, the end-of-year par value of the bond would be
            $1,030 and the second semi-annual interest payment would be $15.45
            ($1,030 times 1.5%).
               If the periodic adjustment rate measuring inflation falls, the
            principal value of inflation-indexed bonds will be adjusted down-
            ward, and consequently the interest payable on these securities
            (calculated with respect to a smaller principal amount) will be
            reduced. Repayment of the original bond principal upon maturity
            (as adjusted for inflation) is guaranteed in the case of U.S.
            Treasury inflation-indexed bonds, even during a period of defla-
            tion. However, the current market value of the bonds is not guar-
            anteed, and will fluctuate. The Funds may also invest in other in-
            flation
 
16 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            related bonds which may or may not provide a similar guarantee. If
            such a guarantee of principal is not provided, the adjusted prin-
            cipal value of the bond repaid at maturity may be less than the
            original principal.
               The value of inflation-indexed bonds is expected to change in
            response to changes in real interest rates. Real interest rates in
            turn are tied to the relationship between nominal interest rates
            and the rate of inflation. Therefore, if inflation were to rise at
            a faster rate than nominal interest rates, real interest rates
            might decline, leading to an increase in value of inflation-in-
            dexed bonds. In contrast, if nominal interest rates increased at a
            faster rate than inflation, real interest rates might rise, lead-
            ing to a decrease in value of inflation-indexed bonds.
               While these securities are expected to be protected from long-
            term inflationary trends, short-term increases in inflation may
            lead to a decline in value. If interest rates rise due to reasons
            other than inflation (for example, due to changes in currency ex-
            change rates), investors in these securities may not be protected
            to the extent that the increase is not reflected in the bond's in-
            flation measure.
               The U.S. Treasury has only recently begun issuing inflation-in-
            dexed bonds. As such, there is no trading history of these securi-
            ties, and there can be no assurance that a liquid market in these
            instruments will develop, although one is expected. Lack of a liq-
            uid market may impose the risk of higher transaction costs and the
            possibility that a Fund may be forced to liquidate positions when
            it would not be advantageous to do so. There also can be no assur-
            ance that the U.S. Treasury will issue any particular amount of
            inflation-indexed bonds. Certain foreign governments, such as the
            United Kingdom, Canada and Australia, have a longer history of is-
            suing inflation-indexed bonds, and there may be a more liquid mar-
            ket in certain of these countries for these securities.
               The periodic adjustment of U.S. inflation-indexed bonds is tied
            to the Consumer Price Index for Urban Consumers ("CPI-U"), which
            is calculated monthly by the U.S. Bureau of Labor Statistics. The
            CPI-U is a measurement of changes in the cost of living, made up
            of components such as housing, food, transportation and energy.
            Inflation-indexed bonds issued by a foreign government are gener-
            ally adjusted to reflect a comparable inflation index, calculated
            by that government. There can be no assurance that the CPI-U or
            any foreign inflation index will accurately measure the real rate
            of inflation in the prices of goods and services. Moreover, there
            can be no assurance that the rate of inflation in a foreign coun-
            try will be correlated to the rate of inflation in the United
            States.
               Any increase in the principal amount of an inflation-indexed
            bond will be considered taxable ordinary income, even though in-
            vestors do not receive their principal until maturity. See "Taxes"
            for information about the possible tax consequences of investing
            in the Real Return Bond Fund and in inflation-indexed bonds.
 
MORTGAGE-   Each of the Funds (except the Money Market Fund and the Municipal
RELATED AND Bond Fund) may invest all of its assets in mortgage- or other as-
OTHER       set-backed securities. The value of some mortgage- or asset-backed
ASSET-      securities in which the Funds invest may be particularly sensitive
BACKED      to changes in prevailing interest rates, and, like the other in-
SECURITIES  vestments of the Funds, the ability of a Fund to successfully uti-
            lize these instruments may depend in part upon the ability of the
            Advisor to forecast interest rates and other economic factors cor-
            rectly.
 
            MORTGAGE-PASS-THROUGH SECURITIES are securities representing in-
            terests in "pools" of mortgage loans secured by residential or
            commercial real property in which payments of both interest and
            principal on the securities are generally made monthly, in effect
            "passing through" monthly payments made by the individual borrow-
            ers on the mortgage loans which underlie the securities (net of
            fees paid to the issuer or guarantor of the securities). Early re-
            payment of principal on some mortgage-related securities (arising
            from prepayments of principal due to sale of the underlying prop-
            erty, refinancing, or foreclosure, net of fees and costs which may
            be incurred) may expose a Fund to a lower rate of return upon re-
            investment of principal. Also, if a security subject to prepayment
            has been purchased at a premium, the value of the premium would be
            lost in the event of prepayment. Like other fixed income securi-
            ties, when interest rates rise, the value of a mortgage-related
            security generally will decline; however, when interest rates are
            declining, the value of mortgage-related securities with prepay-
            ment features may not increase as much as other fixed income secu-
            rities. The rate of prepayments on underlying mortgages will af-
            fect the price and volatility of a mortgage-related security, and
            may have the effect of shortening or extending the effective matu-
            rity of the security beyond what was anticipated at the
                                                       
                                              August 1, 1998 Prospectus 17     
<PAGE>
 
            time of purchase. To the extent that unanticipated rates of pre-
            payment on underlying mortgages increase the effective maturity of
            a mortgage-related security, the volatility of such security can
            be expected to increase.
               Payment of principal and interest on some mortgage pass-through
            securities (but not the market value of the securities themselves)
            may be guaranteed by the full faith and credit of the U.S. Govern-
            ment (in the case of securities guaranteed by GNMA); or guaranteed
            by agencies or instrumentalities of the U.S. Government (in the
            case of securities guaranteed by FNMA or the Federal Home Loan
            Mortgage Corporation ("FHLMC"), which are supported only by the
            discretionary authority of the U.S. Government to purchase the
            agency's obligations). Mortgage-related securities created by non-
            governmental issuers (such as commercial banks, savings and loan
            institutions, private mortgage insurance companies, mortgage bank-
            ers and other secondary market issuers) may be supported by vari-
            ous forms of insurance or guarantees, including individual loan,
            title, pool and hazard insurance and letters of credit, which may
            be issued by governmental entities, private insurers or the mort-
            gage poolers.
 
            COLLATERALIZED MORTGAGE OBLIGATIONS ("CMOs") are hybrid mortgage-
            related instruments. Interest and pre-paid principal on a CMO are
            paid, in most cases, on a monthly basis. CMOs may be collateral-
            ized by whole mortgage loans but are more typically collateralized
            by portfolios of mortgage pass-through securities guaranteed by
            GNMA, FHLMC, or FNMA. CMOs are structured into multiple classes,
            with each class bearing a different stated maturity. Monthly pay-
            ments of principal, including prepayments, are first returned to
            investors holding the shortest maturity class; investors holding
            the longer maturity classes receive principal only after the first
            class has been retired. CMOs that are issued or guaranteed by the
            U.S. Government or by any of its agencies or instrumentalities
            will be considered U.S. Government securities by the Funds, while
            other CMOs, even if collateralized by U.S. Government securities,
            will have the same status as other privately issued securities for
            purposes of applying a Fund's diversification tests.
 
            COMMERCIAL MORTGAGE-BACKED SECURITIES include securities that re-
            flect an interest in, and are secured by, mortgage loans on com-
            mercial real property. The market for commercial mortgage-backed
            securities developed more recently and in terms of total outstand-
            ing principal amount of issues is relatively small compared to the
            market for residential single-family mortgage-backed securities.
            Many of the risks of investing in commercial mortgage-backed secu-
            rities reflect the risks of investing in the real estate securing
            the underlying mortgage loans. These risks reflect the effects of
            local and other economic conditions on real estate markets, the
            ability of tenants to make loan payments, and the ability of a
            property to attract and retain tenants. Commercial mortgage-backed
            securities may be less liquid and exhibit greater price volatility
            than other types of mortgage-related or asset-backed securities.
 
            MORTGAGE-RELATED SECURITIES include securities other than those
            described above that directly or indirectly represent a participa-
            tion in, or are secured by and payable from, mortgage loans on
            real property, such as mortgage dollar rolls (see "Reverse Repur-
            chase Agreements, Dollar Rolls, and Borrowings"), CMO residuals or
            stripped mortgage-backed securities ("SMBS"), and may be struc-
            tured in classes with rights to receive varying proportions of
            principal and interest.
               A common type of SMBS will have one class receiving some of the
            interest and most of the principal from the mortgage assets, while
            the other class will receive most of the interest and the remain-
            der of the principal. In the most extreme case, one class will re-
            ceive all of the interest (the interest-only, or "IO" class),
            while the other class will receive all of the principal (the prin-
            cipal-only, or "PO" class). The yield to maturity on an IO class
            is extremely sensitive to the rate of principal payments (includ-
            ing prepayments) on the related underlying mortgage assets, and a
            rapid rate of principal payments may have a material adverse ef-
            fect on a Fund's yield to maturity from these securities. The Funds
            have adopted a policy under which no Fund will invest more than 5%
            (10% in the case of the Low Duration Mortgage and Total Return
            Mortgage Funds) of its net assets in any combination of IO, PO, or
            inverse floater securities. The Funds may invest in other asset-
            backed securities that have been offered to investors. For a
            discussion of the characteristics of some of these instruments, see
            the Statement of Additional Information.
 
18 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
MUNICIPAL   The Municipal Bond Fund invests in Municipal Bonds which are gen-
BONDS       erally issued by states and local governments and their agencies,
            authorities and other instrumentalities. The Municipal Bonds which
            the Municipal Bond Fund may purchase include general obligation
            bonds and limited obligation bonds (or revenue bonds), including
            industrial development bonds issued pursuant to former federal tax
            law. General obligation bonds are obligations involving the credit
            of an issuer possessing taxing power and are payable from such is-
            suer's general revenues and not from any particular source. Lim-
            ited obligation bonds are payable only from the revenues derived
            from a particular facility or class of facilities or, in some
            cases, from the proceeds of a special excise or other specific
            revenue source. Tax-exempt "private activity" bonds and industrial
            development bonds generally are also revenue bonds and thus are
            not payable from the issuer's general revenues. The Municipal Bond
            Fund may invest in Municipal Bonds with credit enhancements such
            as letters of credit, municipal bond insurance and Standby Bond
            Purchase Agreements. The Municipal Bond Fund may also invest in
            municipal lease obligations, as well as securities derived from
            Municipal Bonds, such as residual interest bonds, participation
            interests and embedded interest rate swaps and caps.
              Municipal Bonds are subject to credit and market risk. Credit
            risk relates to the ability of the issuer to make payments of
            principal and interest. The ability of an issuer to make such pay-
            ments could be affected by litigation, legislation or other polit-
            ical events or the bankruptcy of the issuer. Market risk relates
            to changes in a security's value as a result of changes in inter-
            est rates. Lower rated Municipal Bonds generally provide higher
            yields but are subject to greater credit and market risk than
            higher quality Municipal Bonds.
 
REPURCHASE  For the purpose of achieving income, each of the Funds may enter
AGREEMENTS  into repurchase agreements, which entail the purchase of a portfo-
            lio-eligible security from a bank or broker-dealer that agrees to
            repurchase the security at the Fund's cost plus interest within a
            specified time (normally one day). If the party agreeing to repur-
            chase should default, as a result of bankruptcy or otherwise, the
            Fund will seek to sell the securities which it holds, which action
            could involve procedural costs or delays in addition to a loss on
            the securities if their value should fall below their repurchase
            price. No Fund will invest more than 15% of its net assets (10% in
            the case of the Money Market Fund) (taken at current market value)
            in repurchase agreements maturing in more than seven days.
 
                 
REVERSE     A reverse repurchase agreement involves the sale of a security by
REPURCHASE  a Fund and its agreement to repurchase the instrument at a speci-
AGREEMENTS, fied time and price. Under a reverse repurchase agreement, the
DOLLAR      Fund continues to receive any principal and interest payments on
ROLLS, AND  the underlying security during the term of the agreement. The Fund
BORROWINGS  generally will segregate assets determined to be liquid by the
            Advisor in accordance with procedures established by the Board of
            Trustees to cover its obligations under reverse repurchase
            agreements and, to this extent, a reverse repurchase agreement (or
            economically similar transaction) will not be considered a "senior
            security" subject to the 300% asset coverage requirements otherwise
            applicable to borrowings by a Fund.      
                
               A Fund may enter into dollar rolls, in which the Fund sells
            mortgage-backed or other securities for delivery in the current
            month and simultaneously contracts to purchase substantially simi-
            lar securities on a specified future date. In the case of dollar
            rolls involving mortgage-backed securities, the mortgage-backed
            securities that are purchased will be of the same type and will
            have the same interest rate as those sold, but will be supported
            by different pools of mortgages. The Fund forgoes principal and
            interest paid during the roll period on the securities sold in a
            dollar roll, but the Fund is compensated by the difference between
            the current sales price and the lower price for the future pur-
            chase as well as by any interest earned on the proceeds of the
            securities sold. The Fund also could be compensated through the
            receipt of fee income equivalent to a lower forward price. The Fund
            will segregate assets determined to be liquid by the Advisor in
            accordance with procedures established by the Board of Trustees to
            cover its obligations under dollar rolls.     
                
               To the extent that positions in reverse repurchase agreements,
            dollar rolls or similar transactions are not covered through the
            maintenance of segregated liquid assets at least equal to the amount
            of any forward purchase commitment, such transactions would be
            subject to the Funds' limitations on borrowings, which would
            restrict the aggregate of such transactions (plus any other
            borrowings) to 33 1/3% (for each Fund except the Global Bond     
 
                                                                             
                                               August 1, 1998 Prospectus 19     
<PAGE>
 
            Fund II) of such Fund's total assets. Apart from such transac-
            tions, a Fund will not borrow money, except for temporary adminis-
            trative purposes. The Global Bond Fund II may not borrow in excess
            of 10% of the value of its total assets and then only from banks
            as a temporary measure to facilitate the meeting of redemption re-
            quests (not for leverage) or for extraordinary or emergency pur-
            poses.
 
 
LOANS OF    For the purpose of achieving income, each Fund may lend its port-
PORTFOLIO   folio securities to brokers, dealers, and other financial institu-
SECURITIES  tions, provided: (i) the loan is secured continuously by collat-
            eral consisting of U.S. Government securities, cash or cash equiv-
            alents (negotiable certificates of deposit, bankers' acceptances
            or letters of credit) maintained on a daily mark-to-market basis
            in an amount at least equal to the current market value of the se-
            curities loaned; (ii) the Fund may at any time call the loan and
            obtain the return of the securities loaned; (iii) the Fund will
            receive any interest or dividends paid on the loaned securities;
            and (iv) the aggregate market value of securities loaned will not
            at any time exceed 33 1/3% (25% in the case of the Global Bond
            Fund II) of the total assets of the Fund. Each Fund's performance
            will continue to reflect changes in the value of the securities
            loaned and will also reflect the receipt of either interest,
            through investment of cash collateral by the Fund in permissible
            investments, or a fee, if the collateral is U.S. Government secu-
            rities. Securities lending involves the risk of loss of rights in
            the collateral or delay in recovery of the collateral should the
            borrower fail to return the security loaned or become insolvent.
            The Funds may pay lending fees to the party arranging the loan.
 
    
WHEN-       Each of the Funds may purchase or sell securities on a when-is-
ISSUED,     sued, delayed delivery, or forward commitment basis. These trans-
DELAYED     actions involve a commitment by the Fund to purchase or sell secu-
DELIVERY    rities for a predetermined price or yield, with payment and deliv-
AND FORWARD ery taking place more than seven days in the future, or after a
COMMITMENT  period longer than the customary settlement period for that type
TRANS-      of security. When such purchases are outstanding, the Fund will
ACTIONS     segregate until the settlement date, assets determined to be liquid
            by the Advisor in accordance with procedures established by the
            Board of Trustees, in an amount sufficient to meet the purchase
            price. Typically, no income accrues on securities a Fund has
            committed to purchase prior to the time delivery of the securities
            is made, although a Fund may earn income on securities it has
            segregated. When purchasing a security on a when-issued, delayed
            delivery, or forward commitment basis, the Fund assumes the rights
            and risks of ownership of the security, including the risk of price
            and yield fluctuations, and takes such fluctuations into account
            when determining its net asset value. Because the Fund is not re-
            quired to pay for the security until the delivery date, these risks
            are in addition to the risks associated with the Fund's other
            investments. If the Fund remains substantially fully invested at a
            time when when-issued, delayed delivery, or forward commitment
            purchases are outstanding, the purchases may result in a form of
            leverage. When the Fund has sold a security on a when-issued,
            delayed delivery, or forward commitment basis, the Fund does not
            participate in future gains or losses with respect to the security.
            If the other party to a transaction fails to deliver or pay for the
            securities, the Fund could miss a favorable price or yield
            opportunity or could suffer a loss. A Fund may dispose of or
            renegotiate a transaction after it is entered into, and may sell
            when-issued, delayed delivery or forward commitment securities
            before they are delivered, which may result in a capital gain or
            loss. There is no percentage limitation on the extent to which the
            Funds may purchase or sell securities on a when-issued, delayed
            delivery, or forward commitment basis.     
                
SHORT SALES Each of the Funds (except the High Yield, Total Return III and
            StocksPLUS Funds), and particularly the StocksPLUS Short Strategy
            Fund, may from time to time effect short sales as part of their
            overall portfolio management strategies, including the use of
            derivative instruments, or to offset potential declines in value of
            long positions in similar securities as those sold short. A short
            sale (other than a short sale against the box) is a transaction in
            which a Fund sells a security it does not own at the time of the
            sale in anticipation that the market price of that security will
            decline. To the extent that a Fund engages in short sales, it must
            (except in the case of short sales "against the box") maintain as-
            set coverage in the form of segregated assets determined to be
            liquid by the Advisor in accordance with procedures established by
            the Board of Trustees, or otherwise cover its position in a
            permissible manner. A short sale is "against the box" to the extent
            that the Fund contemporaneously owns, or has      

20 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            the right to obtain at no added cost, securities identical to
            those sold short. The Global Bond Fund II may only engage in short
            sales that are "against the box."
 
 
FOREIGN     Each of the Funds (except the Municipal Bond, Low Duration II,
SECURITIES  Total Return II and Long-Term U.S. Government Funds) may invest
            directly in fixed income securities of non-U.S. issuers. The High
            Yield, Commercial Mortgage Securities, Low Duration Mortgage, Total
            Return Mortgage and Money Market Funds may only invest in U.S.
            dollar-denominated fixed income securities of non-U.S. issuers. Each
            of the Equity Funds may invest directly in foreign equity
            securities.
               Except for the Emerging Markets Bond and Emerging Markets Bond 
            II Funds, each of the Funds will concentrate its foreign investments
            in securities of issuers based in developed countries. However, the
            Short-Term, Low Duration and Low Duration III Funds may
            each invest up to 5% of its assets in securities of issuers based in
            the emerging market countries in which the Emerging Markets Bond
            and Emerging Markets Bond II Funds may invest, and each of the
            remaining Fixed Income Funds that may invest in foreign securities
            may in-vest up to 10% of its assets in such securities.
               Individual foreign economies may differ favorably or unfavor-
            ably from the U.S. economy in such respects as growth of gross do-
            mestic product, rate of inflation, capital reinvestment, re-
            sources, self-sufficiency and balance of payments position. The
            securities markets, values of securities, yields, and risks asso-
            ciated with securities markets in different countries may change
            independently of each other. Investing in the securities of is-
            suers in any foreign country involves special risks and considera-
            tions not typically associated with investing in U.S. companies.
            Shareholders should consider carefully the substantial risks in-
            volved in investing in securities issued by companies and govern-
            ments of foreign nations. These risks include: differences in ac-
            counting, auditing and financial reporting standards; generally
            higher commission rates on foreign portfolio transactions; the
            possibility of nationalization, expropriation or confiscatory tax-
            ation; adverse changes in investment or exchange control regula-
            tions (which may include suspension of the ability to transfer
            currency from a country); and political instability which could
            affect U.S. investments in foreign countries. Additionally, for-
            eign securities and dividends and interest payable on those secu-
            rities may be subject to foreign taxes, including taxes withheld
            from payments on those securities. Foreign securities often trade
            with less frequency and volume than domestic securities and there-
            fore may exhibit greater price volatility. Additional costs asso-
            ciated with an investment in foreign securities may include higher
            custodial fees than apply to domestic custodial arrangements and
            transaction costs of foreign currency conversions. Changes in for-
            eign exchange rates also will affect the value of securities de-
            nominated or quoted in currencies other than the U.S. dollar.
               Certain of the Funds, and particularly the Emerging Markets Bond
            and Emerging Markets Bond II Funds, will invest in the securities of
            issuers based in coun-tries with developing economies. Investing in
            developing (or "emerging market") countries involves certain risks
            not typically associated with investing in U.S. securities, and
            imposes risks greater than, or in addition to, risks of investing in
            foreign, developed countries. A number of emerging market countries
            restrict, to varying degrees, foreign investment in securities. Re-
            patriation of investment income, capital, and the proceeds of sales
            by foreign investors may require governmental registration and/or
            approval in some emerging market countries. A number of the
            currencies of emerging market countries have experienced signifi-
            cant declines against the U.S. dollar in recent years, and devalu-
            ation may occur subsequent to investments in these currencies by a
            Fund. Inflation and rapid fluctuations in inflation rates have had,
            and may continue to have, negative effects on the economies and
            securities markets of certain emerging market countries. Many of the
            emerging securities markets are relatively small, have low trading
            volumes, suffer periods of relative illiquidity, and are
            characterized by significant price volatility. There is a risk in
            emerging market countries that a future economic or political cri-
            sis could lead to price controls, forced mergers of companies, ex-
            propriation or confiscatory taxation, seizure, nationalization, or
            creation of government monopolies, any of which may have a detri-
            mental effect on a Fund's investment.
               Additional risks of investing in emerging market countries may
            include: currency exchange rate fluctuations; greater social, eco-
            nomic and political uncertainty and instability (including the
            risk of war); more substantial governmental involvement in the
            economy; less governmental supervision and regulation of the secu-
            rities markets and participants in those markets; unavailability
            of currency hedging techniques in certain emerging market coun-
            tries; the fact that
                                                       
                                              August 1, 1998 Prospectus 21     
<PAGE>
 
            companies in emerging market countries may be newly organized and
            may be smaller and less seasoned companies; the difference in, or
            lack of, auditing and financial reporting standards, which may re-
            sult in unavailability of material information about issuers; the
            risk that it may be more difficult to obtain and/or enforce a
            judgment in a court outside the United States; and significantly
            smaller market capitalization of securities markets. Also, any
            change in the leadership or policies of Eastern European coun-
            tries, or the countries that exercise a significant influence over
            those countries, may halt the expansion of or reverse the liberal-
            ization of foreign investment policies now occurring and adversely
            affect existing investment opportunities.
               In addition, emerging securities markets may have different
            clearance and settlement procedures, which may be unable to keep
            pace with the volume of securities transactions or otherwise make
            it difficult to engage in such transactions. Settlement problems
            may cause a Fund to miss attractive investment opportunities, hold
            a portion of its assets in cash pending investment, or delay in
            disposing of a portfolio security. Such a delay could result in
            possible liability to a purchaser of the security.
               Each of the Fixed Income Funds (except the Municipal Bond, Low 
            Duration, Total Return II and Long-Term U.S. Government Funds) may
            invest in Brady Bonds. Brady Bonds are securities created through
            the exchange of existing commercial bank loans to sovereign
            entities for new obligations in connection with debt restructurings
            under a debt restructuring plan introduced by former U.S. Secretary
            of the Treasury, Nicholas F. Brady. Brady Bonds have been issued
            only recently, and for that reason do not have a long payment
            history. Brady Bonds may be collateralized or uncollateralized, are
            issued in various currencies (but primarily the U.S. dollar), and
            are actively traded in the over-the-counter secondary market. Brady
            Bonds are not considered to be U.S. Government securities. In light
            of the residual risk of Brady Bonds and, among other factors, the
            history of defaults with respect to commercial bank loans by public
            and private entities in countries issuing Brady Bonds, investments
            in Brady Bonds may be viewed as speculative. There can be no assur-
            ance that Brady Bonds acquired by a Fund will not be subject to
            restructuring arrangements or to requests for new credit, which may
            cause the Fund to suffer a loss of interest or principal on any of
            its holdings. For further information, see the Statement of
            Additional Information.
               Certain of the Funds also may invest in sovereign debt (other
            than Brady Bonds) issued by governments, their agencies or instru-
            mentalities, or other government-related entities located in
            emerging market countries. Holders of sovereign debt may be re-
            quested to participate in the rescheduling of such debt and to ex-
            tend further loans to governmental entities. In addition, there is
            no bankruptcy proceeding by which defaulted sovereign debt may be
            collected.
               A Fund's investments in foreign currency denominated debt obli-
            gations and hedging activities will likely produce a difference
            between its book income and its taxable income. This difference
            may cause a portion of the Fund's income distributions to consti-
            tute returns of capital for tax purposes or require the Fund to
            make distributions exceeding book income to qualify as a regulated
            investment company for federal tax purposes.
 
     
FOREIGN     Foreign currency exchange rates may fluctuate significantly over
CURRENCY    short periods of time. They generally are determined by the forces
TRANS-      of supply and demand in the foreign exchange markets and the rela-
ACTIONS     tive merits of investments in different countries, actual or per-
            ceived changes in interest rates and other complex factors, as
            seen from an international perspective. Currency exchange rates
            also can be affected unpredictably by intervention (or the failure
            to intervene) by U.S. or foreign governments or central banks, by
            currency controls or political developments in the U.S. or abroad.
            For example, significant uncertainty surrounds the proposed
            introduction of the euro (a common currency for the European Union)
            in January 1999 and its effect on the value of securities
            denominated in local European currencies. These and other currencies
            in which the Funds' assets are denominated may be de-valued against
            the U.S. dollar, resulting in a loss to the Funds.     
               All Funds that may invest in securities denominated in foreign
            currencies may buy and sell foreign currencies on a spot and for-
            ward basis to reduce the risks of adverse changes in foreign ex-
            change rates. A forward foreign currency exchange contract in-
            volves an obligation to purchase or sell a specific currency at a
            future date, which may be any fixed number of days from the date
            of the contract agreed upon by the parties, at a price set at the
            time of the contract. By entering into a forward foreign currency
            exchange contract, the Fund "locks in" the exchange rate between
            the currency it will deliver and the currency it will receive for
            the duration of the contract. As a result, a Fund reduces its ex-
            posure to changes in the value of the currency it will deliver and
            increases its exposure to changes in the value of the
 
22 PIMCO Funds: Pacific Investment Management Series
<PAGE>
    
            currency it will exchange into. The effect on the value of a Fund
            is similar to selling securities denominated in one currency and
            purchasing securities denominated in another. Contracts to sell
            foreign currency would limit any potential gain which might be re-
            alized by a Fund if the value of the hedged currency increases. A
            Fund may enter into these contracts for the purpose of hedging
            against foreign exchange risk arising from the Fund's investment
            or anticipated investment in securities denominated in foreign
            currencies. A Fund also may enter into these contracts for pur-
            poses of increasing exposure to a foreign currency or to shift ex-
            posure to foreign currency fluctuations from one country to anoth-
            er. A Fund may use one currency (or a basket of currencies) to
            hedge against adverse changes in the value of another currency (or
            a basket of currencies) when exchange rates between the two cur-
            rencies are positively correlated. Each Fund will segregate assets
            determined to be liquid by the Advisor in accordance with proce-
            dures established by the Board of Trustees, to cover its obligations
            under forward foreign currency exchange contracts entered into for
            non-hedging purposes.     
               All Funds that may invest in securities denominated in foreign
            currencies may invest in options on foreign currencies and foreign
            currency futures and options thereon. The Funds also may invest in
            foreign currency exchange-related securities, such as foreign cur-
            rency warrants and other instruments whose return is linked to
            foreign currency exchange rates. Each Fund that may invest in se-
            curities denominated in foreign currencies, except the Global Bond,
            Emerging Markets Bond and Emerging Markets Bond II Funds, will use
            these techniques to hedge at least 75% of its exposure to foreign
            currency. For a description of these instruments, see "Derivative
            Instruments" below and the Statement of Additional Information.
 
    
HIGH YIELD  The High Yield Fund invests at least 65% of its assets, and the
SECURITIES  Emerging Markets Bond and Emerging Markets Bond II Funds may invest 
("JUNK      up to 100% of its assets and the Commercial Mortgage Securities Fund
BONDS")     may invest up to 35% of its assets, in fixed income securities 
            rated lower than Baa by Moody's or lower than BBB by S&P but rated
            at least B by Moody's or S&P (or, if not rated, of comparable
            quality). In addition, each of the Foreign Bond, Global Bond II,
            Total Return, Real Return Bond, Low Duration, Low Duration III,
            Moderate Duration, Total Return III, Global Bond, StocksPLUS Short
            strategy, Strategic Balanced, Short-Term and StocksPLUS Funds may
            invest up to 10% of its assets in such securities. The Municipal
            Bond Fund may invest up to 10% of its assets in securities rated
            lower than Baa by Moody's or BBB by S&P but rated at least Ba by
            Moody's or BB by S&P. Securities rated lower than Baa by Moody's or
            lower than BBB by S&P are sometimes referred to as "high yield" or
            "junk" bonds. Securities rated Baa are considered by Moody's to have
            some speculative characteristics. Investors should consider the
            following risks associated with high yield securities before
            investing in these Funds.     
               Investing in high yield securities involves special risks in
            addition to the risks associated with investments in higher rated
            fixed income securities. High yield securities may be regarded as
            predominately speculative with respect to the issuer's continuing
            ability to meet principal and interest payments. Analysis of the
            creditworthiness of issuers of high yield securities may be more
            complex than for issuers of higher quality debt securities, and
            the ability of a Fund to achieve its investment objective may, to
            the extent of its investments in high yield securities, be more
            dependent upon such creditworthiness analysis than would be the
            case if the Fund were investing in higher quality securities.
               High yield securities may be more susceptible to real or per-
            ceived adverse economic and competitive industry conditions than
            higher grade securities. The prices of high yield securities have
            been found to be less sensitive to interest rate changes than more
            highly rated investments, but more sensitive to adverse economic
            downturns or individual corporate developments. A projection of an
            economic downturn or of a period of rising interest rates, for ex-
            ample, could cause a decline in high yield security prices because
            the advent of a recession could lessen the ability of a highly
            leveraged company to make principal and interest payments on its
            debt securities. If the issuer of high yield securities defaults,
            a Fund may incur additional expenses to seek recovery. In the case
            of high yield securities structured as zero coupon or payment-in-
            kind securities, the market prices of such securities are affected
            to a greater extent by interest rate changes, and therefore tend
            to be more volatile than securities which pay interest periodi-
            cally and in cash.
               The secondary markets on which high yield securities are traded
            may be less liquid than the market for higher grade securities.
            Less liquidity in the secondary trading markets could adversely
            affect and cause large fluctuations in the daily net asset value
            of a Fund's shares. Adverse publicity and investor perceptions,
            whether or not based on fundamental analysis, may decrease the
            values and liquidity of high yield securities, especially in a
            thinly traded market.
                                                       
                                               August 1, 1998 Prospectus 23     
<PAGE>
 
               The use of credit ratings as the sole method of evaluating high
            yield securities can involve certain risks. For example, credit
            ratings evaluate the safety of principal and interest payments,
            not the market value risk of high yield securities. Also, credit
            rating agencies may fail to change credit ratings in a timely
            fashion to reflect events since the security was last rated. The
            Advisor does not rely solely on credit ratings when selecting se-
            curities for the Funds, and develops its own independent analysis
            of issuer credit quality. If a credit rating agency changes the
            rating of a portfolio security held by a Fund, the Fund may retain
            the portfolio security if the Advisor deems it in the best inter-
            est of shareholders.
               
               During the year ended March 31, 1998, based upon the dollar-
            weighted average ratings of the Funds' portfolio holdings at the
            end of each month in the Funds' fiscal year, each operational Fund
            that may invest greater than 5% of its assets in securities rated
            below investment grade had the following percentages of its net
            assets invested in securities rated in the categories indicated as
            rated by Moody's (or, if unrated, determined by the Advisor to be
            of comparable quality). See "Appendix B--Description of Securities
            Ratings," for further information.     
 
 
              FIXED INCOME SECURITIES RATINGS
 
<TABLE>    
<CAPTION>
                                                    BELOW
           FUND              PRIME 1 Aaa  Aa    A   PRIME 1 Baa  Ba    B
           ---------------------------------------------------------------
           <S>               <C>     <C>  <C>   <C> <C>     <C>  <C>  <C>
           FOREIGN BOND          54%   31%   4%   2%     1%    2%   6%   0%
           ---------------------------------------------------------------
           GLOBAL BOND           34    44    4   10      1     3    4    0
           ---------------------------------------------------------------
           GLOBAL BOND II        65    21    3    6      0     2    3    0
           ---------------------------------------------------------------
           HIGH YIELD             5     2    0    0      2     6   43   42
           ---------------------------------------------------------------
           TOTAL RETURN          20    47    0   13      6     8    6    0
           ---------------------------------------------------------------
           TOTAL RETURN III      16    44    1   17      9     8    5    0
           ---------------------------------------------------------------
           LOW DURATION           6    75    1    1      5     7    5    0
           ---------------------------------------------------------------
           LOW DURATION III      40    54    0    4      0     2    0    0
           ---------------------------------------------------------------
           MODERATE DURATION     23    45    2    8      6     9    7    0
           ---------------------------------------------------------------
           SHORT-TERM            17    35    2   15     16     9    6    0
           ---------------------------------------------------------------
           STOCKSPLUS            26    38    1   10     11     7    7    0
           ---------------------------------------------------------------
           STRATEGIC BALANCED    17    58    1    9      4     2    9    0
           ---------------------------------------------------------------
           EMERGING MARKETS BOND 16    14    0    0      0    18   47    5
</TABLE>     
 
 
               These figures are intended solely to provide disclosure about
            each Fund's asset composition during its most recent fiscal year.
            The asset composition after this time may or may not be approxi-
            mately the same as represented by such figures. In addition, the
            categories reflect ratings by Moody's, and ratings assigned by S&P
            may not be consistent with ratings assigned by Moody's or other
            credit ratings services, and the Advisor may not necessarily agree
            with a rating assigned by any credit rating agency.
 
    
DERIVATIVE  To the extent permitted by the investment objectives and policies
INSTRUMENTS of the Funds, the Funds may (except the Money Market Fund) pur-
            chase and write call and put options on securities, securities in-
            dexes and foreign currencies, and enter into futures contracts and
            use options on futures contracts as further described below. The
            Funds (except the Money Market Fund and the Municipal Bond Fund)
            also may enter into swap agreements with respect to foreign cur-
            rencies, interest rates, and securities indexes. The Funds may use
            these techniques to hedge against changes in interest rates, for-
            eign currency exchange rates or securities prices or as part of
            their overall investment strategies. The Funds (except the Money
            Market Fund and the Municipal Bond Fund) may also purchase and
            sell options relating to foreign currencies for purposes of in-
            creasing exposure to a foreign currency or to shift exposure to
            foreign currency fluctuations from one country to another. Each
            Fund will segregate assets determined to be liquid by the Advisor in
            accordance with procedures established by the Board of Trustees (or,
            as permitted by applicable regulation, enter into certain
            offsetting positions) to cover its obligations under options,
            futures, and swaps to limit leveraging of the Fund.     
               Derivative instruments are considered for these purposes to
            consist of securities or other instruments whose value is derived
            from or related to the value of some other instrument or asset,
            and not to include those securities whose payment of principal
            and/or interest depends upon cash flows from underlying assets,
            such as mortgage-related or asset-backed securities. Each Fund
            (except the Money Market Fund and the Municipal Bond Fund) may in-
            vest all of its
 
24 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            assets in derivative instruments, subject only to the Fund's in-
            vestment objective and policies. The value of some derivative in-
            struments in which the Funds invest may be particularly sensitive
            to changes in prevailing interest rates, and, like the other in-
            vestments of the Funds, the ability of a Fund to successfully uti-
            lize these instruments may depend in part upon the ability of the
            Advisor to forecast interest rates and other economic factors cor-
            rectly. If the Advisor incorrectly forecasts such factors and has
            taken positions in derivative instruments contrary to prevailing
            market trends, the Funds could be exposed to the risk of loss.
               The Funds might not employ any of the strategies described be-
            low, and no assurance can be given that any strategy used will
            succeed. If the Advisor incorrectly forecasts interest rates, mar-
            ket values or other economic factors in utilizing a derivatives
            strategy for a Fund, the Fund might have been in a better position
            if it had not entered into the transaction at all. The use of
            these strategies involves certain special risks, including a pos-
            sible imperfect correlation, or
            even no correlation, between price movements of derivative instru-
            ments and price movements of related investments. While some
            strategies involving derivative instruments can reduce the risk of
            loss, they can also reduce the opportunity for gain or even result
            in losses by offsetting favorable price movements in related in-
            vestments or otherwise, due to the possible inability of a Fund to
            purchase or sell a portfolio security at a time that otherwise
            would be favorable or the possible need to sell a portfolio secu-
            rity at a disadvantageous time because the Fund is required to
            maintain asset coverage or offsetting positions in connection with
            transactions in derivative instruments, and the possible inability
            of a Fund to close out or to liquidate its derivatives positions.
 
            OPTIONS ON SECURITIES, SECURITIES INDEXES, AND CURRENCIES A Fund
            may purchase put options on securities and indexes. One purpose of
            purchasing put options is to protect holdings in an underlying or
            related security against a substantial decline in market value. A
            Fund may also purchase call options on securities and indexes. One
            purpose of purchasing call options is to protect against substan-
            tial increases in prices of securities the Fund intends to pur-
            chase pending its ability to invest in such securities in an or-
            derly manner. An option on a security (or index) is a contract
            that gives the holder of the option, in return for a premium, the
            right to buy from (in the case of a call) or sell to (in the case
            of a put) the writer of the option the security underlying the op-
            tion (or the cash value of the index) at a specified exercise
            price at any time during the term of the option. The writer of an
            option on a security has the obligation upon exercise of the op-
            tion to deliver the underlying security upon payment of the exer-
            cise price or to pay the exercise price upon delivery of the un-
            derlying security. Upon exercise, the writer of an option on an
            index is obligated to pay the difference between the cash value of
            the index and the exercise price multiplied by the specified mul-
            tiplier for the index option. An index is designed to reflect
            specified facets of a particular financial or securities market, a
            specific group of financial instruments or securities, or certain
            economic indicators.
               A Fund may sell put or call options it has previously pur-
            chased, which could result in a net gain or loss depending on
            whether the amount realized on the sale is more or less than the
            premium and other transaction costs paid on the put or call option
            which is sold. A Fund may write a call or put option only if the
            option is "covered" by the Fund holding a position in the under-
            lying securities or by other means which would permit immediate
            satisfaction of the Fund's obligation as writer of the option.
            Prior to exercise or expiration, an option may be closed out by an
            offsetting purchase or sale of an option of the same series.
               The Funds may write covered straddles consisting of a combina-
            tion of a call and a put written on the same underlying security.
            A straddle will be covered when sufficient assets are deposited to
            meet the Funds' immediate obligations. The Funds may use the same
            liquid assets to cover both the call and put options where the ex-
            ercise price of the call and put are the same, or the exercise
            price of the call is higher than that of the put. In such cases,
            the Funds will also segregate liquid assets equivalent to the
            amount, if any, by which the put is "in the money."
               The purchase and writing of options involves certain risks.
            During the option period, the covered call writer has, in return
            for the premium on the option, given up the opportunity to profit
            from a price increase in the underlying security above the exer-
            cise price, but, as long as its obligation as a writer continues,
            has retained the risk of loss should the price of the underlying
            security decline. The writer of an option has no control over the
            time when it may be required to fulfill
 
                                                                      
                                               August 1, 1998 Prospectus 25     
<PAGE>
 
            its obligation as a writer of the option. Once an option writer
            has received an exercise notice, it cannot effect a closing pur-
            chase transaction in order to terminate its obligation under the
            option and must deliver the underlying security at the exercise
            price. If a put or call option purchased by the Fund is not sold
            when it has remaining value, and if the market price of the under-
            lying security remains equal to or greater than the exercise price
            (in the case of a put), or remains less than or equal to the exer-
            cise price (in the case of a call), the Fund will lose its entire
            investment in the option. Also, where a put or call option on a
            particular security is purchased to hedge against price movements
            in a related security, the price of the put or call option may
            move more or less than the price of the related security. There
            can be no assurance that a liquid market will exist when a Fund
            seeks to close out an option position. Furthermore, if trading re-
            strictions or suspensions are imposed on the options markets, a
            Fund may be unable to close out a position.
               Funds that invest in foreign currency-denominated securities
            may buy or sell put and call options on foreign currencies. Cur-
            rency options traded on U.S. or other exchanges may be subject to
            position limits which may limit the ability of a Fund to reduce
            foreign currency risk using such options.
               Over-the-counter options in which certain Funds may invest dif-
            fer from traded options in that they are two-party contracts, with
            price and other terms negotiated between buyer and seller, and
            generally do not have as much market liquidity as exchange-traded
            options. The Funds may be required to treat as illiquid over-the-
            counter options purchased and securities being used to cover cer-
            tain written over-the-counter options.
     
            SWAP AGREEMENTS The Funds (except the Money Market and Municipal
            Bond Funds) may enter into interest rate, index, equity and
            currency exchange rate swap agreements. These transactions would be
            entered into in an attempt to obtain a particular return when it is
            considered desirable to do so, possibly at a lower cost to the Fund
            than if the Fund had invested directly in the asset that yielded the
            desired return. Swap agreements are two-party contracts entered into
            primarily by institutional investors for periods ranging from a few
            weeks to more than one year. In a standard swap transaction, two
            parties agree to exchange the returns (or differentials in rates of
            return) earned or realized on particular predetermined investments
            or instruments, which may be adjusted for an interest factor. The
            gross returns to be exchanged or "swapped" between the parties are
            generally calculated with respect to a "notional amount," i.e., the
            return on or increase in value of a particular dollar amount
            invested at a particular interest rate, in a particular foreign
            currency, or in a "basket" of securities representing a particular
            index. Forms of swap agreements include interest rate caps, under
            which, in return for a premium, one party agrees to make payments to
            the other to the extent that interest rates exceed a specified rate,
            or "cap"; interest rate floors, under which, in return for a
            premium, one party agrees to make payments to the other to the
            extent that interest rates fall below a specified level, or
            "floor"; and interest rate collars, under which a party sells a cap
            and purchases a floor or vice versa in an attempt to protect itself
            against interest rate movements exceeding given minimum or maximum
            levels.     
               
               Most swap agreements entered into by the Funds calculate the
            obligations of the parties to the agreement on a "net basis." Con-
            sequently, a Fund's current obligations (or rights) under a swap
            agreement will generally be equal only to the net amount to be
            paid or received under the agreement based on the relative values
            of the positions held by each party to the agreement (the "net
            amount"). A Fund's current obligations under a swap agreement will
            be accrued daily (offset against amounts owed to the Fund), and
            any accrued but unpaid net amounts owed to a swap counterparty
            will be covered by the segregation of assets determined to be liquid
            by the Advisor in accordance with procedures established by the
            Board of Trustees, to limit any potential leveraging of the Fund's
            portfolio. Obligations under swap agreements so covered will not be
            construed to be "senior securities" for purposes of the Funds'
            investment restriction concerning senior securities. A Fund will
            not enter into a swap agreement with any single party if the net
            amount owed or to be received under existing contracts with that
            party would exceed 5% of the Fund's assets.     
               Whether a Fund's use of swap agreements will be successful in
            furthering its investment objective will depend on the Advisor's
            ability to predict correctly whether certain types of investments
            are likely to produce greater returns than other investments. Be-
            cause they are two-party contracts and because they may have terms
            of greater than seven days, swap agreements may be considered to
            be illiquid investments. Moreover, a Fund bears the risk of loss
            of the amount
 
26 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            expected to be received under a swap agreement in the event of the
            default or bankruptcy of a swap agreement counterparty. The Funds
            will enter into swap agreements only with counterparties that meet
            certain standards for creditworthiness (generally, such
            counterparties would have to be eligible counterparties under the
            terms of the Funds' repurchase agreement guidelines). Certain re-
            strictions imposed on the Funds by the Internal Revenue Code may
            limit the Funds' ability to use swap agreements. The swaps market
            is a relatively new market and is largely unregulated. It is pos-
            sible that developments in the swaps market, including potential
            government regulation, could adversely affect a Fund's ability to
            terminate existing swap agreements or to realize amounts to be re-
            ceived under such agreements.
 
            FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS Each of the
            Fixed Income Funds (except the Money Market Fund and the Municipal
            Bond Fund) may invest in interest rate futures contracts and op-
            tions thereon ("futures options"), and to the extent it may invest
            in foreign currency-denominated securities, may also invest in
            foreign currency futures contracts and options thereon. The Munic-
            ipal Bond Fund may purchase and sell futures contracts on U.S.
            Government securities and Municipal Bonds, as well as purchase put
            and call options on such futures contracts. Each of the Equity Funds
            and the Strategic Balanced Fund may invest in interest rate, stock
            index and foreign currency futures contracts and options thereon.
               There are several risks associated with the use of futures and
            futures options for hedging purposes. There can be no guarantee
            that there will be a correlation between price movements in the
            hedging vehicle and in the portfolio securities being hedged. An
            incorrect correlation could result in a loss on both the hedged
            securities in a Fund and the hedging vehicle, so that the portfo-
            lio return might have been greater had hedging not been attempted.
            There can be no assurance that a liquid market will exist at a
            time when a Fund seeks to close out a futures contract or a
            futures option position. Most futures exchanges and boards of
            trade limit the amount of fluctuation permitted in futures con-
            tract prices during a single day; once the daily limit has been
            reached on a particular contract, no trades may be made that day
            at a price beyond that limit. In addition, certain of these in-
            struments are relatively new and without a significant trading
            history. As a result, there is no assurance that an active second-
            ary market will develop or continue to exist. Lack of a liquid
            market for any reason may prevent a Fund from liquidating an unfa-
            vorable position, and the Fund would remain obligated to meet mar-
            gin requirements until the position is closed.
               The Funds may write covered straddles consisting of a call and
            a put written on the same underlying futures contract. A straddle
            will be covered when sufficient assets are deposited to meet the
            Funds' immediate obligations. A Fund may use the same liquid as-
            sets to cover both the call and put options where the exercise
            price of the call and put are the same, or the exercise price of
            the call is higher than that of the put. In such cases, the Funds
            will also segregate liquid assets equivalent to the amount, if
            any, by which the put is "in the money."
               The Funds will only enter into futures contracts or futures op-
            tions which are standardized and traded on a U.S. or foreign ex-
            change or board of trade, or similar entity, or quoted on an auto-
            mated quotation system. Each Fund will use financial futures con-
            tracts and related options only for "bona fide hedging" purposes,
            as such term is defined in applicable regulations of the CFTC or,
            with respect to positions in financial futures and related options
            that do not qualify as "bona fide hedging" positions, will enter
            such positions only to the extent that aggregate initial margin
            deposits plus premiums paid by it for open futures option posi-
            tions, less the amount by which any such positions are "in-the-
            money," would not exceed 5% of the Fund's net assets.
 
HYBRID      A hybrid instrument can combine the characteristics of securities,
INSTRUMENTS futures, and options. For example, the principal amount or inter-
            est rate of a hybrid could be tied (positively or negatively) to
            the price of some commodity, currency or securities index or an-
            other interest rate (each a "benchmark"). The interest rate or
            (unlike most fixed income securities) the principal amount payable
            at maturity of a hybrid security may be increased or decreased,
            depending on changes in the value of the benchmark.
               Hybrids can be used as an efficient means of pursuing a variety
            of investment goals, including currency hedging, duration manage-
            ment, and increased total return. Hybrids may not bear interest or
            pay dividends. The value of a hybrid or its interest rate may be a
            multiple of a benchmark and, as a result, may be leveraged and
            move (up or down) more

                                                     
                                              August 1, 1998 Prospectus 27     
<PAGE>
    
            steeply and rapidly than the benchmark. These benchmarks may be
            sensitive to economic and political events, such as commodity
            shortages and currency devaluations, which cannot be readily fore-
            seen by the purchaser of a hybrid. Under certain conditions, the
            redemption value of a hybrid could be zero. Thus, an investment in
            a hybrid may entail significant market risks that are not associ-
            ated with a similar investment in a traditional, U.S. dollar-de-
            nominated bond that has a fixed principal amount and pays a fixed
            rate or floating rate of interest. The purchase of hybrids also
            exposes a Fund to the credit risk of the issuer of the hybrids.
            These risks may cause significant fluctuations in the net asset
            value of the Fund. Accordingly, no Fund will invest more than 5%
            of its assets in hybrid instruments.     
               Certain issuers of structured products such as hybrid instru-
            ments may be deemed to be investment companies as defined in the
            1940 Act. As a result, the Funds' investments in these products
            will be subject to limits applicable to investments in investment
            companies and may be subject to restrictions contained in the 1940
            Act.
    
CATASTROPHE Each of the Fixed Income Funds (except the Money Market Fund) and
BONDS       the StocksPLUS Fund may invest in "catastrophe bonds."  Catastrophe
            bonds are fixed income securities, for which the return of 
            principal and payment of interest is contingent on the non-
            occurrence of a specific "trigger" catastrophic event, such as a
            hurricane or an earthquake.  They may be issued by government
            agencies, insurance companies, reinsurers, special purpose
            corporations or other on-shore or off-shore entities.  If a trigger
            event causes losses exceeding a specific amount in the geographic 
            region and time period specified in a bond, a Fund investing in the
            bond may lose a portion or all of its principal invested in the
            bond.  If no trigger event occurs, the Fund will recover its
            principal plus interest.  For some catastrophe bonds, the trigger
            event or losses may be based on companywide losses, index-portfolio
            losses, industry indices, or readings of scientific instruments 
            rather than specified actual losses.  Often the catastrophe bonds
            provide for extensions of maturity that are mandatory, or optional
            at the discretion of the issuer, in order to process and audit loss
            claims in those cases where a trigger event has, or possibly has,
            occurred.  In addition to the specified trigger events, catastrophe
            bonds may also expose the Fund to certain unanticipated risks
            including but not limited to issuer (credit) default, adverse
            regulatory or jurisdictional interpretations, and adverse tax
            consequences.     
   
               Catastrophe bonds are a relatively new type of financial
            instrument.  As such, there is no significant trading history of
            these securities, and there can be no assurance that a liquid
            market in these instruments will develop.  See "Illiquid Securities"
            below.  Lack of a liquid market may impose the risk of higher
            transaction costs and the possibility that a Fund may be forced to
            liquidate positions when it would not be advantageous to do so.
            Catastrophe bonds are typically rated, and a Fund will only invest
            in catastrophe bonds that meet the credit quality requirements for
            the Fund.     


INVESTMENT  Each of the Funds may invest in securities of other investment
IN          companies, such as closed-end management investment companies, or
INVESTMENT  in pooled accounts or other investment vehicles. As a shareholder
COMPANIES   of an investment company, a Fund may indirectly bear service and
            other fees which are in addition to the fees the Fund pays its
            service providers.
 
    
PORTFOLIO   The length of time a Fund has held a particular security is not
TURNOVER    generally a consideration in investment decisions. The investment
            policies of a Fund may lead to frequent changes in the Fund's in-
            vestments, particularly in periods of volatile market movements.
            High portfolio turnover (e.g., over 100%) involves correspondingly
            greater expenses to a Fund, including commissions or dealer mark-
            ups and other transaction costs on the sale of securities and
            reinvestments in other securities. See "Management of the Trust--
            Portfolio Transactions." Such sales may result in realization of
            taxable capital gains. See "Taxes." The portfolio turnover rate
            for the following Funds for the last two fiscal years (1998 and
            1997, respectively) was: Short-Term -- 48% and 77%; Low Duration
            -- 309% and 67%; Low Duration II -- 335% and 237%; High Yield
            -- 37% and 67%; Total Return -- 206% and 173%; Total Return II
            -- 361% and 293%; Total Return III -- 183% and 90%; Long-Term U.S.
            Government -- 177% and 402%; Foreign Bond -- 280% and 984%;
            Global Bond -- 389% and 911%; International Bond -- 255% and 
            875%; StocksPLUS -- 30% and 47%.     
 
 
ILLIQUID    Each of the Funds may invest up to 15% of its net assets in illiq-
SECURITIES  uid securities (10% in the case of the Money Market Fund). Certain
            illiquid securities may require pricing at fair value as deter-
            mined in good faith under the supervision of the Board of Trust-
            ees. The Advisor may be subject to significant delays in disposing
            of illiquid securities, and transactions in illiquid securities
            may entail registration expenses and other transaction costs that
            are higher than those for transactions in liquid securities. The
            term "illiquid securities" for this purpose means securities that
            cannot be disposed of within seven days in the ordinary course of
            business at approximately the amount at which a Fund has valued
            the securities. Illiquid securities are considered to include,
            among other things, written over-the-counter options, securities
            or other liquid assets being used as cover for such options, re-
            purchase agreements with maturities in excess of seven days, cer-
            tain loan participation interests, fixed time deposits which are
            not subject to prepayment or provide for withdrawal penalties upon
            prepayment (other than overnight deposits), securities that are
            subject to legal or contractual restrictions on resale and other
            securities which legally or in the Advisor's opinion may be deemed
            illiquid (not including securities issued pursuant to Rule 144A
            under the Securities Act of 1933 and certain commercial paper that
            Pacific Investment Management has determined to be liquid under
            procedures approved by the Board of Trustees).
               Illiquid securities may include privately placed securities,
            which are sold directly to a small number of investors, usually
            institutions. Unlike public offerings, such securities are not
            registered under the federal securities laws. Although certain of
            these securities may be readily sold, for example, under Rule
            144A, others may be illiquid, and their sale may involve substan-
            tial delays and additional costs.
    
SERVICE     Many of the services provided to the Funds depend on the smooth
SYSTEMS --  functioning of computer systems. Many systems in use today cannot
YEAR 2000   distinguish between the year 1900 and the year 2000. Should any of
PROBLEM     the service systems fail to process information properly, that could
            have an adverse impact on the Funds' operations and services
            provided to shareholders. The Advisor, Distributor, Shareholder
            Servicing and Transfer Agent, Custodian, and certain other service
            providers to the Funds have reported that each is working toward
            mitigating the risks associated with the so-called "year 2000
            problem." However, there can be no assurance that the problem will
            be corrected in all respects and that the Funds' operations and
            services provided to shareholders will not be adversely 
            affected.     
 
            Performance Information
 
            From time to time the Trust may make available certain information
            about the performance of the Class D shares of some or all of the
            Funds. Information about a Fund's performance is based on that
            Fund's (or its predecessor's) record to a recent date and is not
            intended to indicate future performance.
 
28 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               From time to time, the yield and total return for each class of
            shares of the Funds may be included in advertisements or reports
            to shareholders or prospective investors. Yield quotations for the
            Money Market Fund may include current yield and effective yield.
            Current yield will be based on income received by a hypothetical
            investment over a given seven-day period (less expenses accrued
            during the period) and "annualized" (i.e., assuming that the sev-
            en-day yield would be received for 52 weeks, stated in terms of an
            annual percentage return on the investment). Effective yield for
            the Fund is calculated in the manner similar to that used to cal-
            culate current yield, but reflects the compounding effect on earn-
            ings of reinvested dividends. For the remaining Funds, quotations
            of yield for a Fund or class will be based on the investment in-
            come per share (as defined by the Securities and Exchange Commis-
            sion) during a particular 30-day (or one-month) period (including
            dividends and interest), less expenses accrued during the period
            ("net investment income"), and will be computed by dividing net
            investment income by the maximum public offering price per share
            on the last day of the period. The tax equivalent yield of the Mu-
            nicipal Bond Fund's Class D shares may also be advertised, calcu-
            lated like yield except that, for any given tax bracket, net in-
            vestment income will be calculated as the sum of (i) any taxable
            income of the class plus (ii) the tax exempt income of the class
            divided by the difference between 1 and the effective federal in-
            come tax rates for taxpayers in that tax bracket.
                
              The total return of Class D shares of all Funds may be included
            in advertisements or other written material. When a Fund's total
            return is advertised with respect to its Class D shares, it will
            be calculated for the past year, the past five years, and the past
            ten years (or if the Fund has been offered for a period shorter
            than one, five or ten years, that period will be substituted)
            since the establishment of the Fund (or its predecessor series of
            PIMCO Advisors Funds for the Global Bond Fund II), as more fully
            described in the Statement of Additional Information. For periods
            prior to the initial offering date of Class D shares (April 1,
            1998), total return presentations for the Class D shares will be
            based on the historical performance of an older class of the Fund
            (if any) restated, as necessary, to reflect that there are no sales
            charges associated with Class D shares.  The older class to be used
            in each case is set forth in the Statement of Additional 
            Information.  For these purposes, the performance of the older class
            will also be restated to reflect any different operating expenses
            (such as different administrative fees and/or 12b-1/servicing fee
            charges) associated with Class D shares.  In certain cases, such
            a restatement will result in Class D performance which is higher
            than if the performance of the older class were not restated to
            reflect the different Class D operating expenses.  In such cases,
            the Trust's advertisements will also, to the extent appropriate,
            show the lower performance figure reflecting the actual operating
            expenses incurred by the older class for periods prior to the
            initial offering date of Class D shares. Total return is measured by
            comparing the value of an investment in Class D shares of the Fund
            at the beginning of the relevant period to the redemption value of
            the investment in the Fund at the end of the period (assuming im-
            mediate reinvestment of any dividends or capital gains distribu-
            tions at net asset value). Total return may be advertised using
            alternative methods that reflect all elements of return, but that
            may be adjusted to reflect the cumulative impact of alternative fee
            and expense structures, such as the currently effective advisory and
            administrative fees for the Funds.     
                The Funds may also provide current distribution information to
            its shareholders in shareholder reports or other shareholder com-
            munications, or in certain types of sales literature provided to
            prospective investors. Current distribution information for a
            Class D shares of a Fund will be based on distributions for a
            specified period (i.e., total dividends from net investment in-
            come), divided by the net asset value per Class D share on the
            last day of the period and annualized. The rate of current distri-
            butions does not reflect deductions for unrealized losses from
            transactions in derivative instruments such as options and
            futures, which may reduce total return. Current distribution rates
            differ from standardized yield rates in that they represent what
            Class D shares of a Fund have declared and paid to shareholders as
            of the end of a specified period rather than the Fund's actual net
            investment income for that period.
               Performance information for the Trust may also be compared to
            various unmanaged indexes, such as the Standard & Poor's 500 Com-
            posite Stock Price Index, the Lehman Brothers Aggregate Bond In-
            dex, the Lehman Brothers Mortgage-Backed Securities Index, the
            Merrill Lynch 1 to 3 Year Treasury Index, the Lehman Intermediate
            and 20+ Year Treasury Blend Index, the Lehman Inflation Linked 
            Treasury Index, the Lehman Municipal Bond Index, the Lehman BB
            Intermediate Corporate Index, indexes prepared by Lipper Analytical
            Services, the J.P. Morgan Global Index, the J.P. Morgan Emerging
            Markets Bond Index Plus, the Salomon Brothers
 
                                                     
                                               August 1, 1998 Prospectus 29     
<PAGE>
 
            World Government Bond Index-10 Non U.S.-Dollar Hedged and the J.P.
            Morgan Government Bond Index Non U.S.-Dollar Hedged, and other en-
            tities or organizations which track the performance of investment
            companies or investment advisers. Unmanaged indexes (i.e., other
            than Lipper) generally do not reflect deductions for administra-
            tive and management costs and expenses. The Advisor may also re-
            port to shareholders or to the public in advertisements concerning
            the performance of the Advisor as adviser to clients other than
            the Trust, and on the comparative performance or standing of the
            Advisor in relation to other money managers. Such comparative in-
            formation may be compiled or provided by independent ratings serv-
            ices or by news organizations. Any performance information,
            whether related to the Funds or to the Advisor, should be consid-
            ered in light of the Funds' investment objectives and policies,
            characteristics and quality of the portfolio, and the market con-
            ditions during the time period indicated, and should not be con-
            sidered to be representative of what may be achieved in the fu-
            ture. For a description of the methods used to determine yield and
            total return for the Funds, see the Statement of Additional Infor-
            mation.
               Investment results of the Funds will fluctuate over time, and
            any presentation of the Funds' total return or yield for any prior
            period should not be considered as a representation of what an in-
            vestor's total return or yield may be in any future period.
 
            How to Buy Shares
 
            Class D shares of each Fund are continuously offered through fi-
            nancial service firms, such as broker-dealers or registered in-
            vestment advisers, with which the Trust's principal underwriter,
            PIMCO Funds Distributors LLC (the "Distributor"), has an agreement
            for the use of the Funds in particular investment products, pro-
            grams or accounts for which a fee may be charged. See "Financial
            Service Firms" below.
               You may purchase Class D shares only through your financial
            service firm. In connection with purchases, your financial service
            firm is responsible for forwarding all necessary documentation to
            the Distributor, and may charge you for such services. Investors
            who wish to purchase shares of the Funds directly from the Trust
            or the Distributor should inquire as to the other classes of
            shares. See "Description of the Trust--Multiple Classes of
            Shares."
               Class D shares may be purchased at a price equal to their net
            asset value per share next determined after receipt of an order.
            Purchase payments for Class D shares are fully invested at the net
            asset value next determined after acceptance of the trade. All
            purchase orders received by the Distributor from your financial
            service firm prior to the close of regular trading (normally 4:00
            p.m., Eastern time) on the New York Stock Exchange (the "Ex-
            change"), on a regular business day, are processed at that day's
            offering price. In addition, orders received by the Distributor
            from financial service firms after the offering price is deter-
            mined that day will receive such offering price if the orders were
            received by the firm from its customer prior to such determination
            and were transmitted to and received by the Distributor prior to
            its close of business that day (normally 5:00 p.m., Eastern time)
            or, in the case of certain retirement plans, received by the Dis-
            tributor prior to 9:30 a.m., Eastern time on the next business
            day. Purchase orders received on other than a regular business day
            will be executed on the next succeeding regular business day.
               The Distributor, in its sole discretion, may accept or reject any
            order for purchase of Fund shares. The sale of shares will be
            suspended during any period in which the Exchange is closed for
            other than weekends or holidays, or if permitted by the rules of the
            Securities and Exchange Commission, when trading on the Exchange is
            restricted or during an emergency which makes it impracticable for
            the Funds to dispose of their securities or to determine fairly the
            value of their net assets, or during any other period as permitted
            by the Securities and Exchange Commission for the protection of
            investors.
               Class D shares of the Funds will be held in your account with
            your financial service firm and, generally, your firm will hold
            your Class D shares in nominee or street name as your agent. Ac-
            cordingly, in most cases, the Trust's transfer agent will have no
            information with respect to or control over accounts of specific
            Class D shareholders and you may obtain information about your ac-
            counts only through your financial service firm. If you wish to
            invest in the Funds through your own account with the Trust or the
            Distributor, please inquire as to the other classes of shares of
            the Funds. See "Description of the Trust--Multiple Classes of
            Shares." In the interest of economy and convenience, certificates
            for Class D shares will not be issued.
 
FINANCIAL   Broker-dealers, registered investment advisors and other financial
SERVICE     service firms provide varying investment products, programs or ac-
FIRMS       counts, pursuant to arrangements with the Distributor, through
            which their clients may purchase and redeem Class D shares of the
            Funds. Firms will generally provide or arrange for the provision
            of some or all of the shareholder servicing and account mainte-
            nance services required by your account, including, without limi-
            tation, transfers of registration and dividend payee changes; and
            may perform functions such as generation of confirmation state-
            ments and disbursement of cash dividends. Firms may also arrange
            with their clients for other investment or administrative servic-
            es. Your firm may independently establish and charge you transac-
            tion fees and/or other additional amounts for such services, which
            charges could reduce your investment returns on Class D shares of
            the Funds.
               Your financial service firm may have omnibus accounts and simi-
            lar arrangements with the Trust and may be paid for providing sub-
            transfer agency and other services. A firm may be paid for its
            services directly or indirectly by the Funds, the Advisor or an
            affiliate (normally not to exceed an annual rate of 0.35% of a
            Fund's average daily net assets attributable to its Class D shares
            and purchased through such firm for its clients). Your firm may
            establish various minimum investment requirements for Class D
            shares of the Funds and may also establish certain privileges with
            respect to purchases, redemptions and exchanges of Class D shares
            or the reinvestment of dividends.
               This Prospectus should be read in connection with your firm's
            materials regarding its fees and services.
 
            Exchange Privilege
 
            A shareholder may exchange Class D shares of any Fund for Class D
            shares of any other Fund on the basis of their respective net
            asset values. Class D shares of each Fund may also be exchanged
            for Class D shares of certain series of PIMCO Funds: Multi-Manager
            Series, an affiliated mutual fund family composed primarily of
            stock portfolios managed by subsidiaries of PIMCO Advisors L.P.,
            an affiliate of the Advisor. There are currently no exchange fees
            or charges imposed by the Trust, although your financial service
            firm may impose various fees and charges, investment minimums and
            other requirements with respect to exchanges. Please contact your
            financial service firm for details. An exchange will constitute a
            taxable sale for federal income tax purposes.
                
               The Trust reserves the right to refuse exchange purchases if,
            in the judgment of the Advisor, the purchase would adversely af-
            fect a Fund and its shareholders. In particular, a pattern of ex-
            changes characteristic of "market-timing" strategies may be deemed
            by the Advisor to be detrimental to the Trust or a particular Fund.
            Currently, the Trust limits the number of "round trip" exchanges an
            investor may make. An investor makes a "round trip" exchange when
            the investor purchases shares of a particular Fund, subsequently
            exchanges those shares for shares of a different Fund, and then
            exchanges back into the originally purchased Fund. The Trust has the
            right to refuse any exchange for any investor who completes (by
            making the exchange back into shares of the originally purchased
            Fund) more than six round trip exchanges in any twelve-month period.
            Although the Trust has no current intention of terminating or
            modifying the exchange privilege other than as set forth in the
            preceding sentence, it reserves the right to do so at any time.
            Except as otherwise permitted by Securities and Exchange Commission
            regulations, the Trust will give 60 days' ad-vance notice to your
            financial service firm of any termination or material modification
            of the exchange privilege. For further in-formation about exchange
            privileges, please contact your financial service firm.      
            
            How to Redeem
 
            Class D shares may be redeemed through your financial service firm
            on any day the Exchange is open. Shares are redeemed at their net
            asset value next determined after a proper redemption request has
            been received from your financial service firm. There is no charge
            by the Trust or the Distributor with respect to a redemption, al-
            though your financial service firm may charge you for its services
            in processing your redemption request. Please contact your finan-
            cial service firm for details.
               Your financial service firm is obligated to transmit your re-
            demption orders to the Distributor promptly and is responsible for
            ensuring that your redemption request is in proper form. Requests
            for redemption received by financial service firms prior to the
            close of regular trading (normally 4:00 p.m., Eastern time) on the
            Exchange on a regular business day and received by the Distributor
            prior to the close of the Distributor's business day will be con-
            firmed at the net asset value effective as of the closing of the
            Exchange on that day. Your financial service firm will be respon-
            sible for furnishing all necessary documentation to the Distribu-
            tor or the Trust's transfer agent and may charge you for its serv-
            ices. Redemption proceeds will be forwarded to your financial
            service firm as promptly as possible and in any event within seven
            days after the redemption request is received by the Distributor
            in good order. Under unusual circumstances, the Trust may suspend
            redemptions or postpone payment for more than seven days, as per-
            mitted by federal securities law.
 

30 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
            Distributor
 
            The Distributor, a wholly owned subsidiary of PIMCO Advisors L.P.,
            is the principal underwriter of the Trust's shares. Pursuant to a
            Distribution Contract with the Trust, with respect to each Fund's
            Class D shares, the Distributor bears various promotional and sales
            related expenses, including the cost of printing and mailing
            prospectuses to persons other than current shareholders. The
            Distributor, located at 2187 Atlantic Street, Stamford, Connecticut,
            is a broker-dealer registered with the SEC.
 
                                             August 1, 1998 Prospectus 31      
<PAGE>
 

     How Net Asset Value Is Determined

     The net asset value per share of Class D shares of each Fund will
     be determined once on each day on which the Exchange is open as of
     the close of regular trading (normally 4:00 p.m., Eastern time) on
     the Exchange by dividing the total market value of a Fund's portfolio
     investments and other assets attributable to that class, less any
     liabilities, by the number of total outstanding shares of that class. 
     Net asset value will not be determined on days on which the Exchange 
     is closed.
        The Money Market Fund's securities are normally valued using
     the amortized cost method of valuation. This involves valuing a
     security at cost on the date of acquisition and thereafter assuming
     a constant accretion of a discount or amortization of a premium
     to maturity. See the Statement of Additional Information for a 
     description of certain
                                                     
32 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            conditions and procedures followed by the Money Market Fund in
            connection with amortized cost valuation. For all other Funds,
            portfolio securities and other assets for which market quotations
            are readily available are stated at market value. Market value is
            determined on the basis of last reported sales prices, or if no
            sales are reported, as is the case for most securities traded
            over-the-counter, at the mean between representative bid and asked
            quotations obtained from a quotation reporting system or from es-
            tablished market makers. Fixed income securities, including those
            to be purchased under firm commitment agreements (other than obli-
            gations having a maturity of 60 days or less), are normally valued
            on the basis of quotations obtained from brokers and dealers or
            pricing services, which take into account appropriate factors such
            as institutional-sized trading in similar groups of securities,
            yield, quality, coupon rate, maturity, type of issue, trading
            characteristics, and other market data.
               Quotations of foreign securities in foreign currency are con-
            verted to U.S. dollar equivalents using foreign exchange quota-
            tions received from independent dealers. Short-term investments
            having a maturity of 60 days or less are valued at amortized cost,
            when the Board of Trustees determines that amortized cost is their
            fair value. Certain fixed income securities for which daily market
            quotations are not readily available may be valued, pursuant to
            guidelines established by the Board of Trustees, with reference to
            fixed income securities whose prices are more readily obtainable
            and whose durations are comparable to the securities being valued.
            Subject to the foregoing, other securities for which market quota-
            tions are not readily available are valued at fair value as deter-
            mined in good faith by the Board of Trustees.
               Each Fund's liabilities are allocated among its classes. The
            total of such liabilities allocated to a class plus that class's
            distribution and/or servicing fees and any other expenses spe-
            cially allocated to that class are then deducted from the class's
            proportionate interest in the Fund's assets, and the resulting
            amount for each class is divided by the number of shares of that
            class outstanding to produce the class's "net asset value" per
            share. Generally, for Funds that pay income dividends, those divi-
            dends are expected to differ over time by approximately the amount
            of the expense accrual differential between a particular Fund's
            classes.
 
            Distributions
 
            Each Fund pays out as dividends substantially all of its net in-
            vestment income (which comes from dividends and interest it re-
            ceives or is deemed to receive from its investments) and net real-
            ized short-term capital gains. For these purposes and for federal
            income tax purposes, a portion of the premiums from certain ex-
            pired call or put options written by the Fund, net gains from
            closing purchase and sale transactions with respect to such op-
            tions, and net gains from futures transactions are treated as
            short-term capital gains. Each Fund distributes substantially all
            of its net realized capital gains, if any, after giving effect to
            any available capital loss carry-over.
               Shares begin earning dividends on the day after the date that
            funds are received by the Trust for the purchase of shares. For
            the Fixed Income Funds (other than the International Bond Fund),
            dividends are declared daily from net investment income to
            shareholders of record at the close of the previous business day,
            and distributed to shareholders monthly. International Bond,
            Strategic Balanced and the Equity Funds intend to declare and pay as
            a dividend substantially all of their net investment income on a
            quarterly basis. Any net realized capital gains from the sale of
            portfolio securities will be distributed no less frequently than
            once yearly. Dividend and capital gain distributions of a Fund will
            be reinvested in additional shares of that Fund unless the
            shareholder elects to have them paid in cash. There are no sales
            charges on reinvested dividends. If a shareholder has elected to
            receive dividends and/or capital gain distributions in cash and the
            postal or other delivery service is unable to deliver checks to the
            shareholder's address of record, such shareholder's distributions
            will automatically be invested in the Money Market Fund until such
            shareholder is located.
               Class D shareholders may elect to invest dividends and/or
            distributions paid by any Fund in shares of the same class of any
            other Fund of the Trust at net asset value. For further information
            on this option, please contact your financial service firm.

                                               August 1, 1998 Prospectus 33     
<PAGE>
 
            Taxes
 
            Each Fund intends to qualify as a regulated investment company an-
            nually and to elect to be treated as a regulated investment com-
            pany under the Code. As such, a Fund generally will not pay fed-
            eral income tax on the income and gains it pays as dividends to
            its shareholders. In order to avoid a 4% federal excise tax, each
            Fund intends to distribute each year substantially all of its net
            income and gains.
               Shareholders subject to U.S. federal income tax will be subject
            to tax on dividends received from a Fund, regardless of whether
            received in cash or reinvested in additional shares. Distributions
            received by tax-exempt shareholders will not be subject to federal
            income tax to the extent permitted under applicable tax law. All
            shareholders must treat dividends, other than capital gain divi-
            dends or dividends that represent a return of capital to share-
            holders, as ordinary income.
                
               Dividends designated by a Fund as capital gain dividends derived
            from the Fund's net capital gain (that is, the excess of net long-
            term gain over net short-term loss) are taxable to shareholders as
            long-term capital gain except as provided by an applicable tax
            exemption. Any distributions that are not from a Fund's net
            investment income, short-term capital gain, or net capital gain may
            be characterized as a return of capital to shareholders or, in some
            cases, as capital gain. Certain dividends declared in October,
            November or December of a calendar year are taxable to shareholders
            (who otherwise are subject to tax on dividends) as though received
            on December 31 of that year if paid to shareholders during January
            of the following calendar year. Each Fund will advise shareholders
            annually of the amount and nature of the dividends paid to them.    
               Dividends paid to shareholders by the Municipal Bond Fund which
            are derived from interest on Municipal Bonds are expected to be
            designated by the Fund as "exempt-interest dividends," and share-
            holders may exclude such dividends from gross income for federal
            income tax purposes. However, if a shareholder receives social se-
            curity or railroad retirement benefits, the shareholder may be taxed
            on a portion of those benefits as a result of receiving tax-exempt
            income. In addition, certain exempt-interest dividends could, as
            discussed below, cause certain shareholders to become subject to the
            alternative minimum tax and may increase the alternative minimum
            tax liability of shareholders already subject to this tax.     
               To the extent that dividends paid to shareholders by the
            Municipal Bond Fund are derived from taxable interest or from
            capital gains, such dividends will be subject to Federal income tax.
            Any gain realized on a redemption of shares will be taxable gain,
            subject to any applicable tax exemption for which an investor may
            qualify.
                
               Dividends derived from interest on certain U.S. Government se-
            curities may be exempt from state and local taxes, although inter-
            est on mortgage-backed U.S. Government securities (for example,
            interest on FNMA and GNMA Certificates) is generally not so exempt.
            The distributions of "exempt-interest dividends" paid by the
            Municipal Bond Fund may be exempt from state and local taxation
            when received by a shareholder to the extent that they are derived
            from interest on Municipal Bonds issued by the state or political
            subdivision in which such shareholder resides. The federal
            exemption for "exempt-interest dividends" attributable to Municipal
            Bonds does not necessarily result in exemption of such dividends
            from income for the purpose of state and local taxes. The Trust will
            report annually on a state-by-state basis the source of income the
            Municipal Bond Fund receives on Municipal Bonds that was paid out as
            dividends during the preceding year.      
               The Code also provides that exempt-interest dividends allocable
            to interest received from "private activity bonds" issued after
            August 7, 1986 are an item of tax preference for individual and
            corporate alternative minimum tax at the applicable rate for indi-
            viduals and corporations. Therefore, if the Municipal Bond Fund
            invests in such private activity bonds, certain of its sharehold-
            ers may become subject to the alternative minimum tax on that part
            of its distributions to them that are derived from interest income
            on such bonds, and certain shareholders already subject to such
            tax may have increased liability therefor. However, it is the
            present policy of the Municipal Bond Fund to invest no more than
            20% of its assets in such bonds. Other provisions of the Code af-
            fect the tax treatment of distributions from the
                                                    
34 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Municipal Bond Fund for corporations, casualty insurance compa-
            nies, and financial institutions. In particular, under the Code,
            for corporations, alternative minimum taxable income will be in-
            creased by a percentage of the amount by which the corporation's
            "adjusted current earnings" (which includes various items of tax
            exempt income) exceeds the amount otherwise determined to be al-
            ternative minimum taxable income. Accordingly, an investment in
            the Municipal Bond Fund may cause shareholders to be subject to
            (or result in an increased liability under) the alternative mini-
            mum tax.
               Dividends to shareholders of the Municipal Bond Fund derived
            from money market instruments and U.S. Government securities are
            generally taxable as ordinary income. The Fund may seek to reduce
            fluctuations in its net asset value by engaging in portfolio
            strategies involving options on securities, futures contracts, and
            options on futures contracts. Any gain derived by the Fund from
            the use of such instruments, including by reason of "marking to
            market," will be treated as a combination of short-term and long-
            term capital gain and, if not offset by realized capital losses
            incurred by the Fund, will be distributed to shareholders (possi-
            bly requiring the liquidation of other portfolio securities) and
            will be taxable to shareholders as a combination of ordinary in-
            come and long-term capital gain.
               
               Interest accrued by a Fund from inflation-indexed bonds will be
            includable in the Fund's gross income in the period in which it
            accrues. Periodic adjustments for inflation in the principal value
            of these securities also may give rise to original issue discount,
            which, likewise, will be includable in the Fund's gross income on a
            current basis, regardless of whether the Fund receives any cash
            payments. See "Taxation--Original Issue Dis-count" in the Statement
            of Additional Information. Amounts includable in a Fund's gross
            income become subject to tax-related distribution requirements.
            Accordingly, a Fund may be required to make annual distributions to
            shareholders in excess of the cash received in a given period from
            these investments. As a result, the Fund may be required to
            liquidate certain investments at a time when it is not advantageous
            to do so. If the principal value of an inflation-indexed bond is
            adjusted downward in any period as a result of deflation, the
            reduction may be treated as a loss to the extent the reduction
            exceeds coupon payments received in that period; in that case, the
            amount distributable by the Fund may be reduced and amounts
            distributed previously in the taxable year may be characterized in
            some circumstances as a return of capital.     
               Taxable shareholders should note that the timing of their in-
            vestment could have undesirable tax consequences. If shares are
            purchased on or just before the record date of a dividend, taxable
            shareholders will pay full price for the shares and may receive a
            portion of their investment back as a taxable distribution.
               The preceding discussion relates only to federal income tax;
            the consequences under other tax laws may differ. For additional
            information relating to the tax aspects of investing in a Fund,
            see the Statement of Additional Information.
 
            Management of the Trust
 
            The business affairs of the Trust are managed under the direction
            of the Board of Trustees. The Trustees are Guilford C. Babcock, R.
            Wesley Burns, Vern O. Curtis, Brent R. Harris, Thomas P. Kemp, and
            William J. Popejoy. Additional information about the Trustees and
            the Trust's executive officers may be found in the Statement of
            Additional Information under the heading "Management--Trustees and
            Officers."
 
        
INVESTMENT  Pacific Investment Management serves as investment adviser ("Advi-
ADVISOR     sor") to the Funds pursuant to an investment advisory contract.
            The Advisor is an investment counseling firm founded in 1971, and
            had approximately $138 billion in assets under management as of
            June 30, 1998. Pacific Investment Management is a subsidiary of
            PIMCO Advisors L.P. ("PIMCO Advisors"). The general partners of
            PIMCO Advisors are PIMCO Partners, G.P. and PIMCO Advisors Holdings
            L.P. ("PAH"). PIMCO Partners, G.P. is a general partnership between
            PIMCO Holding LLC, a Delaware limited liability company and indirect
            wholly owned subsidiary of Pacific Life Insurance Company, and PIMCO
            Partners LLC, a California limited liability company controlled by
            the PIMCO Managing Directors. PIMCO Partners, G.P. is the sole
            general partner of PAH. Pacific Investment Management's address is
            840 Newport Center Drive, Suite 360, Newport Beach, California
            92660. Pacific Investment Management is registered as an investment
            adviser with the Securities and Exchange Commission and as a
            commodity trading advisor with the CFTC.     

                                              August 1, 1998 Prospectus 35     
<PAGE>
 
               The Advisor manages the investment and reinvestment of the as-
            sets of each Fund. The Advisor is responsible for placing orders
            for the purchase and sale of each Fund's investments directly with
            brokers or dealers selected by it in its discretion. See "Portfo-
            lio Transactions" in the Statement of Additional Information.
               Information about the individual portfolio managers responsible
            for management of the Trust's currently operational Funds offered
            in this Prospectus, including their occupations for the past five
            years, is provided below.
 
<TABLE>     
<CAPTION>
                                          PORTFOLIO MANAGER AND BUSINESS
           FUND                           EXPERIENCE (PAST FIVE YEARS)
           ---------------------------------------------------------------------
           <C>                            <S>
           TOTAL RETURN FUND              William H. Gross, Managing Director,
           TOTAL RETURN FUND II           Pacific Investment Management. A
           TOTAL RETURN FUND III          Fixed Income Portfolio Manager, Mr.
           LOW DURATION FUND              Gross is one of the founders of Pa-
           LOW DURATION FUND II           cific Investment Management and has
           LOW DURATION FUND III          managed the Total Return and Low Du-
           SHORT-TERM FUND                ration Funds since their inception,
           STOCKSPLUS FUND                May 11, 1987. Mr. Gross is the 
           STRATEGIC BALANCED FUND        leader of the team which has 
           MODERATE DURATION FUND         managed the Short-Term, StocksPLUS,
                                          Strategic Balanced and Moderate
                                          Duration Funds since January 6,
                                          1998.
           ---------------------------------------------------------------------
           LOW DURATION MORTGAGE FUND     William C. Powers, Managing Director,
                                          PIMCO. A Fixed Income Portfolio
                                          Manager, Mr. Powers joined PIMCO in
                                          1991.
           ---------------------------------------------------------------------
           LONG-TERM U.S. GOVERNMENT FUND Pasi Hamalainen, Senior Vice Presi-
           TOTAL RETURN MORTGAGE FUND     dent, Pacific Investment Management.
                                          A Fixed Income Portfolio Manager, Mr.
                                          Hamalainen joined Pacific Investment
                                          Management in 1994 and has managed
                                          the Long-Term U.S. Government Fund
                                          since July 1, 1997.
           ---------------------------------------------------------------------
           MUNICIPAL BOND FUND            Benjamin Ehlert, Executive Vice Pres-
                                          ident, PIMCO. A Fixed Income Portfo-
                                          lio Manager, Mr. Ehlert has been as-
                                          sociated with PIMCO for over 23
                                          years.
           ---------------------------------------------------------------------
           EMERGING MARKETS BOND FUND     Michael J. Rosborough, Senior Vice
           EMERGING MARKETS BOND FUND II  President, Pacific Investment Manage-
                                          ment. A Fixed Income Portfolio Manag-
                                          er, Mr. Rosborough was associated
                                          with RBC Dominion in Tokyo as a Vice
                                          President and Manager in foreign
                                          fixed income prior to joining Pacific
                                          Investment Management in 1994.
           ---------------------------------------------------------------------
           FOREIGN BOND FUND              Lee R. Thomas, III, Managing Director
           GLOBAL BOND FUND               and Senior International Portfolio
           GLOBAL BOND FUND II            Manager, Pacific Investment Manage-
           INTERNATIONAL BOND FUND        ment. A Fixed Income Portfolio
                                          Manager, Mr. Thomas has managed the
                                          Foreign Bond Fund since July 13,
                                          1995, and the Global Bond Fund II
                                          since October 1, 1995. Prior to join-
                                          ing Pacific Investment Management in
                                          1995, Mr. Thomas was associated with
                                          Investcorp as a member of the manage-
                                          ment committee responsible for global
                                          securities and foreign exchange trad-
                                          ing. Prior to Investcorp, he was as-
                                          sociated with Goldman Sachs as an Ex-
                                          ecutive Director in foreign fixed in-
                                          come.
           ---------------------------------------------------------------------
           HIGH YIELD FUND                Benjamin Trosky, Managing Director,
                                          Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Trosky joined Pacific Investment
                                          Management in 1990 and has managed
                                          the High Yield Fund since its incep-
                                          tion, December 16, 1992.
           --------------------------------------------------------------------
           REAL RETURN BOND FUND          John Brynjolfsson, Vice President,
                                          Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Brynjolfsson joined Pacific Invest-
                                          ment Management in 1989, and has man-
                                          aged the Real Return Bond Fund since
                                          its inception, January 29, 1997.
           --------------------------------------------------------------------
           MONEY MARKET FUND              Leslie Barbi, Senior Vice President,
                                          Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Ms.
                                          Barbi has managed the Money Market
                                          Fund since November 1, 1995. Prior to
                                          joining Pacific Investment Management
                                          in 1993, Ms. Barbi was associated
                                          with Salomon Brothers as a proprie-
                                          tary Portfolio Manager.
</TABLE>     
 
 
     
FUND        Pacific Investment Management also serves as administrator to the
ADMINIS-    Funds' Class D shares pursuant to an administration agreement 
TRATOR      with the Trust. Pacific Investment Management provides
            administrative services for Class D shareholders of the Funds, which
            include clerical help and accounting, bookkeeping, internal audit
            services, and certain other services required by the Funds,
            preparation of reports to the Funds' shareholders and regulatory
            filings. Pacific Investment Management may also retain certain of
            its affiliates to provide certain of these services. In addition,
            Pacific Investment Management, at its own expense, arranges for the
            provision of legal, audit, custody, transfer agency (including sub-
            transfer agency and other administrative      

36 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            services) and other services for the Funds, and is responsible for
            the costs of registration of the Trust's shares and the printing
            of prospectuses and shareholder reports for current shareholders.
               Pacific Investment Management or an affiliate may pay financial
            service firms a portion of the Class D administration fees in return
            for the firms' services (normally not to exceed an annual rate of
            .35% of a Fund's average daily net assets attributable to Class D
            shares purchased through such firms). The administration agreement
            for Class D shares has been adopted in conformity with the
            requirements set forth under Rule 12b-1 of the 1940 Act to allow for
            the payment of up to .25% per annum of the Class D administrative
            fees for activities that may be deemed to be primarily intended to
            result in the sale of Class D shares. The principal types of
            activities for which such payments may be made are services in
            connection with the distribution and marketing of Class D shares
            and/or the provision of shareholders services.
              The Funds (and not Pacific Investment Management) are responsible
            for the following expenses: (i) salaries and other compensation of
            any of the Trust's executive officers and employees who are not
            officers, directors, stockholders or employees of Pacific Investment
            Management or its subsidiaries or affiliates; (ii) taxes and
            governmental fees; (iii) brokerage fees and commissions and other
            portfolio transaction expenses; (iv) the costs of borrowing money,
            including interest expenses; (v) fees and expenses of the Trustees
            who are not "interested persons" of Pacific Investment Management or
            the Trust, and any counsel retained exclusively for their benefit;
            (vi) extraordinary expenses, including costs of litigation and
            indemnification expenses; (vii) expenses, such as organizational
            expenses, which are capitalized in accordance with generally
            accepted accounting principles; and (viii) any expenses allocated or
            allocable to a specific class of shares, which include servicing
            fees payable with respect to Class D shares, and may include certain
            other expenses as permitted by the Trust's Multi-Class Plan adopted
            pursuant to Rule 18f-3 under the 1940 Act, subject to review and
            approval by the Trustees.
 
ADVISORY    The Funds feature fixed advisory and administrative fee rates. For
AND         providing investment advisory and administrative services to the
ADMINIS-    Funds as described above, Pacific Investment Management receives
TRATIVE     monthly fees from each Fund at an annual rate (i) based on the av-
FEES        erage daily net assets of the Fund for advisory fees and, (ii) at-
            tributable in the aggregate to the Fund's Class D shares for ad-
            ministrative fees, as follows:

<TABLE>
<CAPTION>
                                                  ADVISORY
           FUND                                   FEE RATE
           -----------------------------------------------------
           <S>                                    <C>
           Money Market Fund                      .15%
           -----------------------------------------------------
           StocksPLUS, StocksPLUS Short Strategy,
             Strategic Balanced, and Commercial
             Mortgage Securities Funds            .40%                      
           -----------------------------------------------------
           Emerging Markets Bond and Emerging
             Markets Bond II Funds                .45%
           -----------------------------------------------------
           All other Funds                        .25%
 
 
 
<CAPTION>
                                                  ADMINISTRATIVE
           FUND                                   FEE RATE*
           -----------------------------------------------------
           <S>                                    <C>
           Money Market Fund                      .45%
           -----------------------------------------------------
           Total Return, Low Duration and Short-
             Term Funds                           .50%
           -----------------------------------------------------
           Municipal Bond Fund                    .60%
           -----------------------------------------------------
           Foreign Bond, Global Bond, Global 
             Bond II and International Bond
             Funds                                .70%
           -----------------------------------------------------
           Emerging Markets Bond and Emerging
             Markets Bond II Funds                .80%
           -----------------------------------------------------
           All other Funds                        .65%
</TABLE>

          * As described under the "Fund Administrator," the administration
            agreement includes a plan adopted in conformity with Rule 12b-1
            which provides for the payment of up to .25% of the Administrative
            Fee Rate as reimbursement for expenses in respect of activities that
            may be deemed to be primarily intended to result in the sale of
            Class D shares. The "Annual Fund Operating Expenses" table on page 4
            of this Prospectus shows the Administrative Fee Rate under two
            separate columns entitled "Administrative Fee" and "12b-1 (Service)
            Fee."

               Both the investment advisory contract and administration agree-
            ment with respect to Class D shares of the Funds may be terminated
            by the Trustees at any time on 60 days' written notice. The in-
            vestment advisory contract may be terminated by Pacific Investment
            Management on 60 days' written notice. Following the expiration of
            the one-year period commencing with the effectiveness of the ad-
            ministration agreement, it may be terminated by Pacific Investment
            Management on 60 days' written notice. Following its initial two-
            year term, the investment advisory contract will continue from
            year to year if approved by the Trustees. Following its initial
            one-year term, the administration agreement with respect to Class
            D shares of the Funds will continue from year-to-year if approved
            by the Trustees.
 
PORTFOLIO   Pursuant to the advisory contract, the Advisor places orders for
TRANS-      the purchase and sale of portfolio investments for the Funds' ac-
ACTIONS     counts with brokers or dealers selected by it in its discretion.
            In effecting purchases and sales of portfolio securities for the
            account of the Funds, the Advisor will seek the best price and ex-
            ecution of the Funds' orders. In doing so, a Fund may pay higher
            commission rates than the lowest available when the Advisor be-
            lieves it is reasonable to do so in light of the value of the bro-
            kerage and research services provided by the broker effecting the
            transaction.
 
                                                     April 1, 1998 Prospectus 37
<PAGE>
 
               The Advisor manages the Funds without regard generally to re-
            strictions on portfolio turnover, except those imposed on its
            ability to engage in short-term trading by provisions of the fed-
            eral tax laws. The use of certain derivative instruments with rel-
            atively short maturities may tend to exaggerate the portfolio
            turnover rate for some of the Funds. Trading in fixed income secu-
            rities does not generally involve the payment of brokerage commis-
            sions, but does involve indirect transaction costs. The use of
            futures contracts may involve the payment of commissions to
            futures commission merchants. The higher the rate of portfolio
            turnover of a Fund, the higher all these transaction costs borne
            by the Fund generally will be. The portfolio turnover rate for
            each Fund for which financial highlights are provided in this Pro-
            spectus is set forth under "Financial Highlights."
               Some securities considered for investments by the Funds may
            also be appropriate for other clients served by the Advisor. If a
            purchase or sale of securities consistent with the investment pol-
            icies of a Fund and one or more of these clients served by the Ad-
            visor is considered at or about the same time, transactions in
            such securities will be allocated among the Fund and clients in a
            manner deemed fair and reasonable by the Advisor. The Advisor may
            aggregate orders for the Funds with simultaneous transactions en-
            tered into on behalf of other clients of the Advisor so long as
            price and transaction expenses are averaged either for that trans-
            action or for the day.
 
            Description of the Trust
 
CAPITALI-   The Trust was organized as a Massachusetts business trust on Feb-
ZATION      ruary 19, 1987. The Board of Trustees may establish additional
            portfolios in the future. The capitalization of the Trust consists
            solely of an unlimited number of shares of beneficial interest
            with a par value of $0.0001 each. When issued, shares of the Trust
            are fully paid, non-assessable and freely transferable.
               Under Massachusetts law, shareholders could, under certain cir-
            cumstances, be held personally liable for the obligations of the
            Trust. However, the Declaration of Trust disclaims liability of
            the shareholders, Trustees or officers of the Trust for acts or
            obligations of the Trust, which are binding only on the assets and
            property of the Trust, and requires that notice of the disclaimer
            be given in each contract or obligation entered into or executed
            by the Trust or the Trustees. The Declaration of Trust also pro-
            vides for indemnification out of Trust property for all loss and
            expense of any shareholder held personally liable for the obliga-
            tions of the Trust. The risk of a shareholder incurring financial
            loss on account of shareholder liability is limited to circum-
            stances in which such disclaimer is inoperative or the Trust it-
            self is unable to meet its obligations, and thus should be consid-
            ered remote.
   
    
MULTIPLE    In addition to Class D shares, each Fund offers up to five 
CLASSES OF  additional classes, Class A, Class B, Class C, Institutional Class 
SHARES      and Administrative Class shares, through separate prospectuses. The
            other classes are subject to different sales charges and expense
            levels than Class D shares, which will affect performance
            accordingly. This Prospectus relates only to the Class D shares of
            the Funds. Unlike Class D shares, which may be purchased only
            through financial service firms, the other classes may be purchased
            directly from the Trust and/or the Distributor. Shareholders of a
            particular class may also receive additional services or services
            different from those received by the other classes. Investors may
            contact the Distributor at 800-426-0107 for more information
            concerning Class A, B, C or D shares of the Funds. To obtain more
            information about the Institutional and Administrative Class shares,
            please call the Distributor at 800-927-4648.

VOTING      Shareholders have the right to vote on the election of Trustees
            and on any and all matters on which the law or the Declaration of
            Trust states they may be entitled to vote. The Trust is not re-
            quired to hold regular annual meetings of Trust shareholders and
            does not intend to do so. Shareholders of a class of shares or
            Fund have separate voting rights with respect to matters that only
            affect that class or Fund. See "Other Information--Voting Rights"
            in the Statement of Additional Information.
               The Declaration of Trust provides that the holders of not less
            than two-thirds of the outstanding shares of the Trust may remove
            a person serving as Trustee either by declaration in writing or at
            a meeting called for such purpose. The Trustees are required to
            call a meeting for the purpose of considering the removal of a
            person serving as Trustee if requested in writing to do so by the
            holders of not less than 10% of the outstanding shares of the
            Trust.

38 PIMCO Funds: Pacific Investment Management Series
<PAGE>
                
               Shares entitle their holders to one vote per share (with pro-
            portionate voting for fractional shares). As of July 7, 1998, the
            following were shareholders of record of at least 25% of the out-
            standing voting securities of the indicated Fund: William Barron
            Hilton, Trustee (Beverly Hills, California) with respect to the
            Short-Term Fund; Sprint Corporation (Westwood, Kansas) with respect
            to the Low Duration Fund II; Loyola Academy Endowment Fund (Chicago,
            Illinois) and Sisters of St. Joseph/Michigan (Nazareth, Michigan)
            with respect to the Low Duration Fund III; National Financial
            Services Corporation (New York, New York) with respect to the Real
            Return Bond Fund; Charles Schwab & Co., Inc. (San Francisco,
            California) with respect to the Foreign Bond Fund; IBM Retirement
            Plan (Brooklyn, New York) with respect to the Emerging Markets Bond
            Fund II; and California Community Foundation (Los Angeles,
            California) with respect to the Strategic Balanced Fund. To the
            extent such shareholders are also the beneficial owners of those
            shares, they may be deemed to control (as that term is defined in
            the 1940 Act) the relevant Fund. As used in this Prospectus, the
            phrase "vote of a majority of the outstanding shares" of a Fund (or
            the Trust) means the vote of the lesser of: (1) 67% of the shares of
            the Fund (or the Trust) present at a meeting, if the holders of more
            than 50% of the outstanding shares are present in person or by
            proxy; or (2) more than 50% of the outstanding shares of the Fund
            (or the Trust).     

                                             August 1, 1998 Prospectus 39       
<PAGE>
 
            Appendix A
            Description of Duration
 
            Duration is a measure of the expected life of a fixed income secu-
            rity that was developed as a more precise alternative to the con-
            cept of "term to maturity." Traditionally, a fixed income
            security's "term to maturity" has been used as a proxy for the
            sensitivity of the security's price to changes in interest rates
            (which is the "interest rate risk" or "volatility" of the securi-
            ty). However, "term to maturity" measures only the time until a
            fixed income security provides its final payment, taking no ac-
            count of the pattern of the security's payments prior to maturity.
            In contrast, duration incorporates a bond's yield, coupon interest
            payments, final maturity and call features into one measure. Dura-
            tion management is one of the fundamental tools used by the Advi-
            sor.
               Duration is a measure of the expected life of a fixed income
            security on a present value basis. Duration takes the length of
            the time intervals between the present time and the time that the
            interest and principal payments are scheduled or, in the case of a
            callable bond, expected to be received, and weights them by the
            present values of the cash to be received at each future point in
            time. For any fixed income security with interest payments occur-
            ring prior to the payment of principal, duration is always less
            than maturity. In general, all other things being equal, the lower
            the stated or coupon rate of interest of a fixed income security,
            the longer the duration of the security; conversely, the higher
            the stated or coupon rate of interest of a fixed income security,
            the shorter the duration of the security.
               Futures, options and options on futures have durations which,
            in general, are closely related to the duration of the securities
            which underlie them. Holding long futures or call option positions
            (backed by a segregated account of cash and cash equivalents) will
            lengthen a Fund's duration by approximately the same amount that
            holding an equivalent amount of the underlying securities would.
               Short futures or put option positions have durations roughly
            equal to the negative duration of the securities that underlie
            these positions, and have the effect of reducing portfolio dura-
            tion by approximately the same amount that selling an equivalent
            amount of the underlying securities would.
               There are some situations where even the standard duration cal-
            culation does not properly reflect the interest rate exposure of a
            security. For example, floating and variable rate securities often
            have final maturities of ten or more years; however, their inter-
            est rate exposure corresponds to the frequency of the coupon re-
            set. For inflation-indexed bonds, duration is calculated on the
            basis of modified real duration, which measures price changes of
            inflation-indexed bonds on the basis of changes in real, rather
            than nominal, interest rates. Another example where the interest
            rate exposure is not properly captured by duration is the case of
            mortgage pass-through securities. The stated final maturity of
            such securities is generally 30 years, but current prepayment
            rates are more critical in determining the securities' interest
            rate exposure. Finally, the duration of a fixed income security
            may vary over time in response to changes in interest rates and
            other market factors. In these and other similar situations, the
            Advisor will use more sophisticated analytical techniques that in-
            corporate the anticipated economic life of a security into the de-
            termination of its interest rate exposure.
 
40 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Appendix B
            Description of Securities Ratings
 
            Certain of the Funds make use of average portfolio credit quality
            standards to assist institutional investors whose own investment
            guidelines limit their investments accordingly. In determining a
            Fund's overall dollar-weighted average quality, unrated securities
            are treated as if rated, based on the Advisor's view of their com-
            parability to rated securities. A Fund's use of average quality
            criteria is intended to be a guide for those institutional invest-
            ors whose investment guidelines require that assets be invested
            according to comparable criteria. Reference to an overall average
            quality rating for a Fund does not mean that all securities held
            by the Fund will be rated in that category or higher. A Fund's in-
            vestments may range in quality from securities rated in the lowest
            category in which the Fund is permitted to invest to securities
            rated in the highest category (as rated by Moody's or S&P or, if
            unrated, determined by the Advisor to be of comparable quality).
            The percentage of a Fund's assets invested in securities in a par-
            ticular rating category will vary. Following is a description of
            Moody's and S&P's ratings applicable to fixed income securities.
 
 
MOODY'S     CORPORATE AND MUNICIPAL BOND RATINGS
INVESTORS      Aaa: Bonds which are rated Aaa are judged to be of the best
SERVICE,    quality. They carry the smallest degree of investment risk and are
INC.        generally referred to as "gilt edge." Interest payments are pro-
            tected by a large or by an exceptionally stable margin and princi-
            pal is secure. While the various protective elements are likely to
            change, such changes as can be visualized are most unlikely to im-
            pair the fundamentally strong position of such issues.
               Aa: Bonds which are rated Aa are judged to be of high quality
            by all standards. Together with the Aaa group they comprise what
            are generally known as high-grade bonds. They are rated lower than
            the best bonds because margins of protection may not be as large
            as in Aaa securities or fluctuation of protective elements may be
            of greater amplitude or there may be other elements present that
            make the long-term risks appear somewhat larger than with Aaa se-
            curities.
               A: Bonds which are rated A possess many favorable investment
            attributes and are to be considered as upper-medium-grade obliga-
            tions. Factors giving security to principal and interest are con-
            sidered adequate but elements may be present that suggest a sus-
            ceptibility to impairment sometime in the future.
               Baa: Bonds which are rated Baa are considered as medium-grade
            obligations (i.e., they are neither highly protected nor poorly
            secured). Interest payments and principal security appear adequate
            for the present but certain protective elements may be lacking or
            may be characteristically unreliable over any great length of
            time. Such bonds lack outstanding investment characteristics and
            in fact have speculative characteristics as well.
               Ba: Bonds which are rated Ba are judged to have speculative el-
            ements; their future cannot be considered as well-assured. Often
            the protection of interest and principal payments may be very mod-
            erate and thereby not well safeguarded during both good and bad
            times over the future. Uncertainty of position characterizes bonds
            in this class.
               B: Bonds which are rated B generally lack characteristics of a
            desirable investment. Assurance of interest and principal payments
            or of maintenance of other terms of the contract over any long pe-
            riod of time may be small.
               Caa: Bonds which are rated Caa are of poor standing. Such is-
            sues may be in default or there may be present elements of danger
            with respect to principal or interest.
               Ca: Bonds which are rated Ca represent obligations which are
            speculative in a high degree. Such issues are often in default or
            have other marked shortcomings.
               C: Bonds which are rated C are the lowest rated class of bonds
            and issues so rated can be regarded as having extremely poor pros-
            pects of ever attaining any real investment standing.
               Moody's applies numerical modifiers, 1, 2, and 3 in each ge-
            neric rating classified from Aa through B in its corporate bond
            rating system. The modifier 1 indicates that the security ranks in
            the higher end of its generic rating category; the modifier 2 in-
            dicates a mid-range ranking; and the modifier 3 indicates that the
            issue ranks in the lower end of its generic rating category.
     
                                                     April 1, 1998 Prospectus 41
<PAGE>
 
            CORPORATE SHORT-TERM DEBT RATINGS

            Moody's short-term debt ratings are opinions of the ability of is-
            suers to repay punctually senior debt obligations which have an
            original maturity not exceeding one year. Obligations relying upon
            support mechanisms such as letters of credit and bonds of indem-
            nity are excluded unless explicitly rated.
               Moody's employs the following three designations, all judged to
            be investment grade, to indicate the relative repayment ability of
            rated issuers:
               PRIME-1: Issuers rated Prime-1 (or supporting institutions)
            have a superior ability for repayment of senior short-term debt
            obligations. Prime-1 repayment ability will often be evidenced by
            many of the following characteristics: leading market positions in
            well-established industries; high rates of return on funds em-
            ployed; conservative capitalization structure with moderate reli-
            ance on debt and ample asset protection; broad margins in earnings
            coverage of fixed financial charges and high internal cash genera-
            tion; and well-established access to a range of financial markets
            and assured sources of alternate liquidity.
               PRIME-2: Issuers rated Prime-2 (or supporting institutions)
            have a strong ability for repayment of senior short-term debt ob-
            ligations. This will normally be evidenced by many of the charac-
            teristics cited above but to a lesser degree. Earnings trends and
            coverage ratios, while sound, may be more subject to variation.
            Capitalization characteristics, while still appropriate, may be
            more affected by external conditions. Ample alternate liquidity is
            maintained.
               PRIME-3: Issuers rated Prime-3 (or supporting institutions)
            have an acceptable ability for repayment of senior short-term ob-
            ligations. The effect of industry characteristics and market com-
            positions may be more pronounced. Variability in earnings and
            profitability may result in changes in the level of debt protec-
            tion measurements and may require relatively high financial lever-
            age. Adequate alternate liquidity is maintained.
               NOT PRIME: Issuers rated Not Prime do not fall within any of
            the Prime rating categories.
 
 
STANDARD &  CORPORATE AND MUNICIPAL BOND RATINGS
POOR'S
RATINGS
SERVICES    Investment Grade
               AAA: Debt rated AAA has the highest rating assigned by S&P. Ca-
            pacity to pay interest and repay principal is extremely strong.
               AA: Debt rated AA has a very strong capacity to pay interest
            and repay principal and differs from the highest rated issues only
            in small degree.
               A: Debt rated A has a strong capacity to pay interest and repay
            principal although it is somewhat more susceptible to the adverse
            effects of changes in circumstances and economic conditions than
            debt in higher rated categories.
               BBB: Debt rated BBB is regarded as having an adequate capacity
            to pay interest and repay principal. Whereas it normally exhibits
            adequate protection parameters, adverse economic conditions, or
            changing circumstances are more likely to lead to a weakened ca-
            pacity to pay interest and repay principal for debt in this cate-
            gory than in higher-rated categories.
 
            Speculative Grade
            Debt rated BB, B, CCC, CC, and C is regarded as having predomi-
            nantly speculative characteristics with respect to capacity to pay
            interest and repay principal. BB indicates the least degree of
            speculation and C the highest. While such debt will likely have
            some quality and protective characteristics, these are outweighed
            by large uncertainties or major exposures to adverse conditions.
               BB: Debt rated BB has less near-term vulnerability to default
            than other speculative issues. However, it faces major ongoing un-
            certainties or exposure to adverse business, financial, or eco-
            nomic conditions which could lead to inadequate capacity to meet
            timely interest and principal payments. The BB rating category is
            also used for debt subordinated to senior debt that is assigned an
            actual or implied BBB- rating.
                                                 
42 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               B: Debt rated B has a greater vulnerability to default but cur-
            rently has the capacity to meet interest payments and principal
            repayments. Adverse business, financial, or economic conditions
            will likely impair capacity or willingness to pay interest and re-
            pay principal. The B rating category is also used for debt subor-
            dinated to senior debt that is assigned an actual or implied BB or
            BB- rating.
               CCC: Debt rated CCC has a currently identifiable vulnerability
            to default and is dependent upon favorable business, financial,
            and economic conditions to meet timely payment of interest and re-
            payment of principal. In the event of adverse business, financial
            or economic conditions, it is not likely to have the capacity to
            pay interest and repay principal. The CCC rating category is also
            used for debt subordinated to senior debt that is assigned an ac-
            tual or implied B or B- rating.
               CC: The rating CC is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC rating.
               C: The rating C is typically applied to debt subordinated to
            senior debt that is assigned an actual or implied CCC- debt rat-
            ing. The C rating may be used to cover a situation where a bank-
            ruptcy petition has been filed, but debt service payments are con-
            tinued.
               CI: The rating CI is reserved for income bonds on which no in-
            terest is being paid.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period. The D rating will also be used upon the filing of a
            bankruptcy petition if debt service payments are jeopardized.
               Plus (+) or Minus (-): The ratings from AA to CCC may be modi-
            fied by the addition of a plus or minus sign to show relative
            standing within the major rating categories.
               Provisional ratings: The letter "p" indicates that the rating
            is provisional. A provisional rating assumes the successful com-
            pletion of the project being financed by the debt being rated and
            indicates that payment of debt service requirements is largely or
            entirely dependent upon the successful and timely completion of
            the project. This rating, however, while addressing credit quality
            subsequent to completion of the project, makes no comment on the
            likelihood of, or the risk of default upon failure of, such com-
            pletion. The investor should exercise his own judgment with re-
            spect to such likelihood and risk.
               r: The "r" is attached to highlight derivative, hybrid, and
            certain other obligations that S&P believes may experience high
            volatility or high variability in expected returns due to non-
            credit risks. Examples of such obligations are: securities whose
            principal or interest return is indexed to equities, commodities,
            or currencies; certain swaps and options; and interest only and
            principal only mortgage securities.
               The absence of an "r" symbol should not be taken as an indica-
            tion that an obligation will exhibit no volatility or variability
            in total return.
               N.R.: Not rated.
               Debt obligations of issuers outside the United States and its
            territories are rated on the same basis as domestic corporate and
            municipal issues. The ratings measure the creditworthiness of the
            obligor but do not take into account currency exchange and related
            uncertainties.
 
            COMMERCIAL PAPER RATING DEFINITIONS
            An S&P commercial paper rating is a current assessment of the
            likelihood of timely payment of debt having an original maturity
            of no more than 365 days. Ratings are graded into several catego-
            ries, ranging from A for the highest quality obligations to D for
            the lowest. These categories are as follows:
               A-1: This highest category indicates that the degree of safety
            regarding timely payment is strong. Those issues determined to
            possess extremely strong safety characteristics are denoted with a
            plus sign (+) designation.
               A-2: Capacity for timely payment on issues with this designa-
            tion is satisfactory. However, the relative degree of safety is
            not as high as for issues designated A-1.
                                                                                
                                                     April 1, 1998 Prospectus 43
<PAGE>
 
               A-3: Issues carrying this designation have adequate capacity
            for timely payment. They are, however, more vulnerable to the ad-
            verse effects of changes in circumstances than obligations carry-
            ing the higher designations.
               B: Issues rated B are regarded as having only speculative ca-
            pacity for timely payment.
               C: This rating is assigned to short-term debt obligations with
            a doubtful capacity for payment.
               D: Debt rated D is in payment default. The D rating category is
            used when interest payments or principal payments are not made on
            the date due, even if the applicable grace period has not expired,
            unless S&P believes that such payments will be made during such
            grace period.
               A commercial paper rating is not a recommendation to purchase,
            sell or hold a security inasmuch as it does not comment as to mar-
            ket price or suitability for a particular investor. The ratings
            are based on current information furnished to S&P by the issuer or
            obtained from other sources it considers reliable. S&P does not
            perform an audit in connection with any rating and may, on occa-
            sion, rely on unaudited financial information. The ratings may be
            changed, suspended, or withdrawn as a result of changes in or un-
            availability of such information.
                                               
44 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
PIMCO Funds:
Pacific Investment
Management Series

- --------------------------------------------------------------------------------
INVESTMENT ADVISOR AND ADMINISTRATOR
   
Pacific Investment Management Company, 840 Newport Center Drive, Suite 300,
Newport Beach, CA 92660     

- --------------------------------------------------------------------------------
DISTRIBUTOR

PIMCO Funds Distributors LLC, 2187 Atlantic Street, Stamford,
Connecticut 06902

- --------------------------------------------------------------------------------
CUSTODIAN

Investors Fiduciary Trust Company, 801 Pennsylvania, Kansas City, MO 64105

- --------------------------------------------------------------------------------
SHAREHOLDER SERVICING AGENT AND TRANSFER AGENT

Shareholder Services, Inc., P.O. Box 5866, Denver, Colorado 80217

- --------------------------------------------------------------------------------
INDEPENDENT ACCOUNTANTS

Price Waterhouse LLP, 1055 Broadway, Kansas City, MO 64105

- --------------------------------------------------------------------------------
LEGAL COUNSEL
    
Dechert Price & Rhoads, 1775 Eye Street N.W., Washington, D.C. 20006
     
- --------------------------------------------------------------------------------

For further information about the PIMCO Funds, call 1-800-426-0107.



<PAGE>
 
                                 PIMCO Funds:
                      Pacific Investment Management Series

                      Statement of Additional Information


  PIMCO Funds (the "Trust") is an open-end management investment company
("mutual fund") currently consisting of twenty-five separate investment
portfolios (the "Funds"): the PIMCO Money Market Fund; the PIMCO Short-Term
Fund; the PIMCO Low Duration Fund; the PIMCO Low Duration Fund II; the PIMCO Low
Duration Fund III; the PIMCO Low Duration Mortgage Fund; the PIMCO Moderate
Duration Fund; the PIMCO Real Return Bond Fund; the PIMCO Total Return Fund; the
PIMCO Total Return Fund II; the PIMCO Total Return Fund III; the PIMCO Total
Return Mortgage Fund; the PIMCO Commercial Mortgage Securities Fund; the PIMCO
High Yield Fund; the PIMCO Long-Term U.S. Government Fund; the PIMCO Global Bond
Fund; the PIMCO Global Bond Fund II; the PIMCO Foreign Bond Fund; the PIMCO
International Bond Fund; the PIMCO Emerging Markets Bond Fund; the PIMCO
Emerging Markets Bond Fund II; the PIMCO Municipal Bond Fund; the PIMCO
Strategic Balanced Fund; the PIMCO StocksPLUS Fund; and the PIMCO StocksPLUS
Short Strategy Fund.  Shares of the PIMCO International Bond Fund and PIMCO
Emerging Markets Bond Fund II are offered only to clients of PIMCO who maintain
separately managed private accounts.
   
  The Trust's investment adviser is Pacific Investment Management Company
("PIMCO" or the "Adviser"), 840 Newport Center Drive, Suite 300, Newport Beach,
California 92660.  PIMCO is a subsidiary partnership of PIMCO Advisors L.P.
("PIMCO Advisors").     
   
  This Statement of Additional Information is not a Prospectus, and should be
used in conjunction with a Prospectus for the Trust.  Each Fund offers up to six
classes of shares, offered through four Prospectuses. Class A, Class B, and
Class C shares of certain Funds are offered through the "Class A, B and C
Prospectus", Class D shares of certain Funds are offered through the "Class D
Prospectus", Institutional Class and Administrative Class shares of the Funds
are offered through the "Institutional Prospectus", and Class A shares of the
Total Return Fund also are offered through a separate prospectus, each dated
August 1, 1998, as amended or supplemented from time to time (collectively, the
"Prospectuses").  A copy of each Prospectus may be obtained free of charge at
the address and telephone number listed below.     

                                                   Class A, B and C Prospectus
  Institutional Prospectus:                        and Class D Prospectus:
     
  PIMCO Funds                                      PIMCO Funds Distributors LLC
  840 Newport Center Drive                         2187 Atlantic Street
  Suite 300                                        Stamford, Connecticut 06902
  Newport Beach, California 92660                  Telephone:  (800) 426-0107
  Telephone: (800) 927-4648 (Current Shareholders)
             (800) 800-0952 (New Accounts)     

   
August 1, 1998     
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE> 
<CAPTION> 
                                        
                                                                                                                   Page
<S>                                                                                                                <C>
INVESTMENT OBJECTIVES AND POLICIES ...............................................................................  1

     Borrowing ...................................................................................................  1
     Corporate Debt Securities ...................................................................................  2
     Participation on Creditors Committees .......................................................................  3
     Mortgage-Related and Other Asset-Backed Securities ..........................................................  4
     Foreign Securities ..........................................................................................  8
     Foreign Currency Transactions ...............................................................................  9
     Foreign Currency Exchange-Related Securities ................................................................ 11
     Bank Obligations ............................................................................................ 12
     Loan Participations ......................................................................................... 13
     Delayed Funding Loans and Revolving Credit Facilities ....................................................... 14
     Short Sales ................................................................................................. 15
     Derivative Instruments ...................................................................................... 15
     Warrants to Purchase Securities ............................................................................. 22
     Illiquid Securities ......................................................................................... 22
     Municipal Bonds ............................................................................................. 23
     Social Investment Policies .................................................................................. 25

INVESTMENT RESTRICTIONS .......................................................................................... 25

     Fundamental Investment Restrictions ......................................................................... 25
     Non-Fundamental Investment Restrictions ..................................................................... 27

MANAGEMENT OF THE TRUST .......................................................................................... 32

     Trustees and Officers ....................................................................................... 32
     Compensation Table .......................................................................................... 35
     Investment Adviser .......................................................................................... 35
     Fund Administrator .......................................................................................... 37

DISTRIBUTION OF TRUST SHARES ..................................................................................... 41

     Distributor and Multi-Class Plan ............................................................................ 41
     Contingent Deferred Sales Charge and Initial Sales Charge ................................................... 42
     Distribution and Servicing Plans for Class A, Class B and Class C Shares .................................... 43
     Distribution and Administrative Services Plans for Administrative Class Shares .............................. 47
     Plan for Class D Shares ..................................................................................... 48
     Purchases, Exchanges and Redemptions ........................................................................ 50

PORTFOLIO TRANSACTIONS AND BROKERAGE ............................................................................. 51

     Investment Decisions ........................................................................................ 51
     Brokerage and Research Services ............................................................................. 52
     Portfolio Turnover .......................................................................................... 52

NET ASSET VALUE .................................................................................................. 53
</TABLE> 
<PAGE>
 
<TABLE> 

<S>                                                                                                                <C>
TAXATION ......................................................................................................... 53

     Distributions ............................................................................................... 55
     Sales of Shares ............................................................................................. 56
     Backup Withholding .......................................................................................... 56
     Options, Futures and Forward Contracts, and Swap Agreements ................................................. 56
     Short Sales ................................................................................................. 57
     Passive Foreign Investment Companies ........................................................................ 57
     Foreign Currency Transactions ............................................................................... 58
     Foreign Taxation ............................................................................................ 58
     Original Issue Discount and Market Discount ................................................................. 58
     Other Taxation .............................................................................................. 59

OTHER INFORMATION ................................................................................................ 60

     Capitalization .............................................................................................. 60
     Performance Information ..................................................................................... 60
     Potential College Cost Table ................................................................................ 68
     Voting Rights ............................................................................................... 71
     The Reorganization of the PIMCO Money Market and Total Return II Funds ...................................... 95
     The Reorganization of the PIMCO Global Bond Fund II ......................................................... 95
     Code of Ethics .............................................................................................. 95
     Custodian, Transfer Agent and Dividend Disbursing Agent ..................................................... 96
     Independent Accountants ..................................................................................... 96
     Counsel ..................................................................................................... 96
     Registration Statement ...................................................................................... 96
     Financial Statements ........................................................................................ 97
</TABLE> 
<PAGE>
 
                       INVESTMENT OBJECTIVES AND POLICIES

     The investment objectives and general investment policies of each Fund are
described in the Prospectuses. Additional information concerning the
characteristics of certain of the Funds' investments is set forth below.

Borrowing
   
     A Fund may borrow for temporary administrative purposes.  This borrowing
may be unsecured. Provisions of the Investment Company Act of 1940 ("1940 Act")
require a Fund to maintain continuous asset coverage (that is, total assets
including borrowings, less liabilities exclusive of borrowings) of 300% of the
amount borrowed, with an exception for borrowings not in excess of 5% of the
Fund's total assets made for temporary administrative purposes.  Any borrowings
for temporary administrative purposes in excess of 5% of the Fund's total assets
must maintain continuous asset coverage.  If the 300% asset coverage should
decline as a result of market fluctuations or other reasons, a Fund may be
required to sell some of its portfolio holdings within three days to reduce the
debt and restore the 300% asset coverage, even though it may be disadvantageous
from an investment standpoint to sell securities at that time. As noted below, a
Fund also may enter into certain transactions, including reverse repurchase
agreements, mortgage dollar rolls, and sale-buybacks, that can be viewed as
constituting a form of borrowing or financing transaction by the Fund.  To the
extent a Fund covers its commitment under a reverse repurchase agreement (or
economically similar transaction) by the segregation of assets determined in
accordance with procedures adopted by the Trustees, equal in value to the amount
of the Fund's commitment to repurchase, such an agreement will not be considered
a "senior security" by the Fund and therefore will not be subject to the 300%
asset coverage requirement otherwise applicable to borrowings by the Funds.
Borrowing will tend to exaggerate the effect on net asset value of any increase
or decrease in the market value of a Fund's portfolio.  Money borrowed will be
subject to interest costs which may or may not be recovered by appreciation of
the securities purchased.  A Fund also may be required to maintain minimum
average balances in connection with such borrowing or to pay a commitment or
other fee to maintain a line of credit; either of these requirements would
increase the cost of borrowing over the stated interest rate.  The PIMCO Global
Bond Fund II may not borrow in excess of 10% of the value of its total assets
and then only from banks as a temporary measure to facilitate the meeting of
redemption requests (not for leverage) or for extraordinary or emergency
purposes.     
   
     In addition to borrowing for temporary purposes, a Fund may enter into
reverse repurchase agreements, mortgage dollar rolls, and economically similar
transactions.  A reverse repurchase agreement involves the sale of a portfolio-
eligible security by a Fund, coupled with its agreement to repurchase the
instrument at a specified time and price.  Under a reverse repurchase agreement,
the Fund continues to receive any principal and interest payments on the
underlying security during the term of the agreement. The Fund typically will
segregate assets determined to be liquid by the Adviser in accordance with
procedures established by the Board of Trustees, equal (on a daily mark-to-
market basis) to its obligations under reverse repurchase agreements.  However,
reverse repurchase agreements involve the risk that the market value of
securities retained by the Fund may decline below the repurchase price of the
securities sold by the Fund which it is obligated to repurchase. To the extent
that positions in reverse repurchase agreements are not covered through the
segregation of liquid assets at least equal to the amount of any forward
purchase commitment, such transactions would  be subject to the Funds'
limitations on borrowings, which  would restrict the aggregate of such
transactions (plus any other borrowings) to 33 1/3% (for each Fund except the
PIMCO Global Bond Fund II) of a Fund's total assets.     

     A "mortgage dollar roll" is similar to a reverse repurchase agreement in
certain respects.  In a "dollar roll" transaction a Fund sells a mortgage-
related security, such as a security issued by the Government National Mortgage
Association ("GNMA"), to a dealer and simultaneously agrees to
<PAGE>
 
repurchase a similar security (but not the same security) in the future at a
pre-determined price. A "dollar roll" can be viewed, like a reverse repurchase
agreement, as a collateralized borrowing in which a Fund pledges a mortgage-
related security to a dealer to obtain cash. Unlike in the case of reverse
repurchase agreements, the dealer with which a Fund enters into a dollar roll
transaction is not obligated to return the same securities as those originally
sold by the Fund, but only securities which are "substantially identical." To be
considered "substantially identical," the securities returned to a Fund
generally must: (1) be collateralized by the same types of underlying mortgages;
(2) be issued by the same agency and be part of the same program; (3) have a
similar original stated maturity; (4) have identical net coupon rates; (5) have
similar market yields (and therefore price); and (6) satisfy "good delivery"
requirements, meaning that the aggregate principal amounts of the securities
delivered and received back must be within 2.5% of the initial amount delivered.
   
     A Fund's obligations under a dollar roll agreement must be covered by
segregated liquid assets equal in value to the securities subject to repurchase
by the Fund.  As with reverse repurchase agreements, to the extent that
positions in dollar roll agreements are not covered by segregated liquid assets
at least equal to the amount of any forward purchase commitment, such
transactions would be subject to the Funds' limitations on borrowings.
Furthermore, because dollar roll transactions may be for terms ranging between
one and six months, dollar roll transactions may be deemed "illiquid" and
subject to a Fund's overall limitations on investments in illiquid securities.
A Fund also may effect simultaneous purchase and sale transactions that are
known as "sale-buybacks".  A sale-buyback is similar to a reverse repurchase
agreement, except that in a sale-buyback, the counterparty who purchases the
security is entitled to receive any principal or interest payments make on the
underlying security pending settlement of the Fund's repurchase of the
underlying security.  A Fund's obligations under a sale-buyback typically would
be offset by liquid assets equal in value to the amount of the Fund's forward
commitment to repurchase the subject security.     

Corporate Debt Securities

     A Fund's investments in U.S. dollar or foreign currency-denominated
corporate debt securities of domestic or foreign issuers are limited to
corporate debt securities (corporate bonds, debentures, notes and other similar
corporate debt instruments, including convertible securities) which meet the
minimum ratings criteria set forth for the Fund, or, if unrated, are in the
Adviser's opinion comparable in quality to corporate debt securities in which
the Fund may invest.  The rate of return or return of principal on some debt
obligations may be linked or indexed to the level of exchange rates between the
U.S. dollar and a foreign currency or currencies.

     Among the corporate debt securities in which the Funds may invest are
convertible securities.  A convertible debt security is a bond, debenture, note,
or other security that entitles the holder to acquire common stock or other
equity securities of the same or a different issuer.  A convertible security
generally entitles the holder to receive interest paid or accrued until the
convertible security matures or is redeemed, converted or exchanged.  Before
conversion, convertible securities have characteristics similar to non-
convertible debt securities.  Convertible securities rank senior to common stock
in a corporation's capital structure and, therefore, generally entail less risk
than the corporation's common stock, although the extent to which such risk is
reduced depends in large measure upon the degree to which the convertible
security sells above its value as a fixed income security.

     A convertible security may be subject to redemption at the option of the
issuer at a predetermined price. If a convertible security held by a Fund is
called for redemption, the Fund would be required to permit the issuer to redeem
the security and convert it to underlying common stock, or would sell the
convertible security to a third party.  A Fund generally would invest in
convertible securities for their favorable price characteristics and total
return potential and would normally not exercise an option to convert.

                                       2
<PAGE>
 
     Securities rated Baa and BBB are the lowest which are considered
"investment grade" obligations. Moody's Investor Service, Inc. ("Moody's")
describes securities rated Baa as "medium-grade" obligations; they are "neither
highly protected nor poorly secured . . . [i]nterest payments and principal
security appear adequate for the present but certain protective elements may be
lacking or may be characteristically unreliable over any great length of time.
Such bonds lack outstanding investment characteristics and in fact have
speculative characteristics as well." Standard & Poor's Ratings Services ("S&P")
describes securities rated BBB as "regarded as having an adequate capacity to
pay interest and repay principal . . . [w]hereas it normally exhibits adequate
protection parameters, adverse economic conditions or changing circumstances are
more likely to lead to a weakened capacity to pay interest and repay principal .
 . . than in higher rated categories."

     Investments in securities rated below investment grade that are eligible
for purchase by certain of the Funds (i.e., rated B or better by Moody's or
S&P), and in particular, by the PIMCO High Yield Fund, are described as
"speculative" by both Moody's and S&P.  Investment in lower rated corporate debt
securities ("high yield securities" or "junk bonds") generally provides greater
income and increased opportunity for capital appreciation than investments in
higher quality securities, but they also typically entail greater price
volatility and principal and income risk. These high yield securities are
regarded as predominantly speculative with respect to the issuer's continuing
ability to meet principal and interest payments.  Analysis of the
creditworthiness of issuers of debt securities that are high yield may be more
complex than for issuers of higher quality debt securities.

     High yield securities may be more susceptible to real or perceived adverse
economic and competitive industry conditions than investment grade securities.
The prices of high yield securities have been found to be less sensitive to
interest-rate changes than higher-rated investments, but more sensitive to
adverse economic downturns or individual corporate developments.  A projection
of an economic downturn or of a period of rising interest rates, for example,
could cause a decline in high yield security prices because the advent of a
recession could lessen the ability of a highly leveraged company to make
principal and interest payments on its debt securities.  If an issuer of high
yield securities defaults, in addition to risking payment of all or a portion of
interest and principal, the Funds investing in such securities may incur
additional expenses to seek recovery.  In the case of high yield securities
structured as zero-coupon or pay-in-kind securities, their market prices are
affected to a greater extent by interest rate changes, and therefore tend to be
more volatile than securities which pay interest periodically and in cash.

     The secondary market on which high yield securities are traded may be less
liquid than the market for higher grade securities.  Less liquidity in the
secondary trading market could adversely affect the price at which the Funds
could sell a high yield security, and could adversely affect the daily net asset
value of the shares.  Adverse publicity and investor perceptions, whether or not
based on fundamental analysis, may decrease the values and liquidity of high
yield securities, especially in a thinly-traded market.  When secondary markets
for high yield securities are less liquid than the market for higher grade
securities, it may be more difficult to value the securities because such
valuation may require more research, and elements of judgment may play a greater
role in the valuation because there is less reliable, objective data available.
The Adviser seeks to minimize the risks of investing in all securities through
diversification, in-depth credit analysis and attention to current developments
in interest rates and market conditions.

Participation on Creditors Committees

     A Fund (in particular, the PIMCO High Yield Fund) may from time to time
participate on committees formed by creditors to negotiate with the management
of financially troubled issuers of securities held by the Fund.  Such
participation may subject a Fund to expenses such as legal fees and may make a
Fund an "insider" of the issuer for purposes of the federal securities laws, and
therefore may restrict such Fund's ability to trade in or acquire additional
positions in a particular security when it might otherwise desire to do so.
Participation by a Fund on such committees also may expose the Fund to potential
liabilities under the federal bankruptcy laws or other laws governing the rights
of creditors and debtors.  A Fund will participate on such committees only when
the Adviser believes that such participation

                                       3
<PAGE>
 
is necessary or desirable to enforce the Fund's rights as a creditor or to
protect the value of securities held by the Fund.

Mortgage-Related and Other Asset-Backed Securities

     Mortgage-related securities are interests in pools of residential or
commercial mortgage loans, including mortgage loans made by savings and loan
institutions, mortgage bankers, commercial banks and others.  Pools of mortgage
loans are assembled as securities for sale to investors by various governmental,
government-related and private organizations.  See "Mortgage Pass-Through
Securities."  Certain of the Funds may also invest in debt securities which are
secured with collateral consisting of mortgage-related securities (see
"Collateralized Mortgage Obligations"), and in other types of mortgage-related
securities.

     Mortgage Pass-Through Securities.  Interests in pools of mortgage-related
securities differ from other forms of debt securities, which normally provide
for periodic payment of interest in fixed amounts with principal payments at
maturity or specified call dates.  Instead, these securities provide a monthly
payment which consists of both interest and principal payments.  In effect,
these payments are a "pass-through" of the monthly payments made by the
individual borrowers on their residential or commercial mortgage loans, net of
any fees paid to the issuer or guarantor of such securities.  Additional
payments are caused by repayments of principal resulting from the sale of the
underlying property, refinancing or foreclosure, net of fees or costs which may
be incurred. Some mortgage-related securities (such as securities issued by
GNMA) are described as "modified pass-through."  These securities entitle the
holder to receive all interest and principal payments owed on the mortgage pool,
net of certain fees, at the scheduled payment dates regardless of whether or not
the mortgagor actually makes the payment.

     The rate of prepayments on underlying mortgages will affect the price and
volatility of a mortgage-related security, and may have the effect of shortening
or extending the effective maturity of the security beyond what was anticipated
at the time of purchase.  To the extent that unanticipated rates of prepayment
on underlying mortgages increase in the effective maturity of a mortgage-related
security, the volatility of such security can be expected to increase.

     The principal governmental guarantor of mortgage-related securities is
GNMA.  GNMA is a wholly owned United States Government corporation within the
Department of Housing and Urban Development. GNMA is authorized to guarantee,
with the full faith and credit of the United States Government, the timely
payment of principal and interest on securities issued by institutions approved
by GNMA (such as savings and loan institutions, commercial banks and mortgage
bankers) and backed by pools of mortgages insured by the Federal Housing
Administration (the "FHA"), or guaranteed by the Department of Veterans Affairs
(the "VA").

     Government-related guarantors (i.e., not backed by the full faith and
credit of the United States Government) include the Federal National Mortgage
Association ("FNMA") and the Federal Home Loan Mortgage Corporation ("FHLMC").
FNMA is a government-sponsored corporation owned entirely by private
stockholders.  It is subject to general regulation by the Secretary of Housing
and Urban Development.  FNMA purchases conventional (i.e., not insured or
guaranteed by any government agency) residential mortgages from a list of
approved seller/servicers which include state and federally chartered savings
and loan associations, mutual savings banks, commercial banks and credit unions
and mortgage bankers.  Pass-through securities issued by FNMA are guaranteed as
to timely payment of principal and interest by FNMA but are not backed by the
full faith and credit of the United States Government.  FHLMC was created by
Congress in 1970 for the purpose of increasing the availability of mortgage
credit for residential housing.  It is a government-sponsored corporation
formerly owned by the twelve Federal Home Loan Banks and now owned entirely by
private stockholders.  FHLMC issues Participation Certificates ("PCs") which
represent interests in conventional mortgages from FHLMC's national portfolio.
FHLMC guarantees the timely payment of interest and ultimate collection of
principal, but PCs are not backed by the full faith and credit of the United
States Government.

                                       4
<PAGE>
 
     Commercial banks, savings and loan institutions, private mortgage insurance
companies, mortgage bankers and other secondary market issuers also create pass-
through pools of conventional residential mortgage loans.  Such issuers may, in
addition, be the originators and/or servicers of the underlying mortgage loans
as well as the guarantors of the mortgage-related securities.  Pools created by
such non-governmental issuers generally offer a higher rate of interest than
government and government-related pools because there are no direct or indirect
government or agency guarantees of payments in the former pools. However, timely
payment of interest and principal of these pools may be supported by various
forms of insurance or guarantees, including individual loan, title, pool and
hazard insurance and letters of credit.  The insurance and guarantees are issued
by governmental entities, private insurers and the mortgage poolers. Such
insurance and guarantees and the creditworthiness of the issuers thereof will be
considered in determining whether a mortgage-related security meets the Trust's
investment quality standards.  There can be no assurance that the private
insurers or guarantors can meet their obligations under the insurance policies
or guarantee arrangements.  The Funds may buy mortgage-related securities
without insurance or guarantees if, through an examination of the loan
experience and practices of the originator/servicers and poolers, the Adviser
determines that the securities meet the Trust's quality standards.  Although the
market for such securities is becoming increasingly liquid, securities issued by
certain private organizations may not be readily marketable.  No Fund will
purchase mortgage-related securities or any other assets which in the Adviser's
opinion are illiquid if, as a result, more than 15% of the value of the Fund's
net assets will be illiquid (10% in the case of the PIMCO Money Market Fund.)

     Mortgage-backed securities that are issued or guaranteed by the U.S.
Government, its agencies or instrumentalities, are not subject to the Funds'
industry concentration restrictions, set forth below under "Investment
Restrictions," by virtue of the exclusion from that test available to all U.S.
Government securities.  In the case of privately issued mortgage-related
securities, the Funds take the position that mortgage-related securities do not
represent interests in any particular "industry" or group of industries. The
assets underlying such securities may be represented by a portfolio of first
lien residential mortgages (including both whole mortgage loans and mortgage
participation interests) or portfolios of mortgage pass-through securities
issued or guaranteed by GNMA, FNMA or FHLMC.  Mortgage loans underlying a
mortgage-related security may in turn be insured or guaranteed by the FHA or the
VA.  In the case of private issue mortgage-related securities whose underlying
assets are neither U.S. Government securities nor U.S. Government-insured
mortgages, to the extent that real properties securing such assets may be
located in the same geographical region, the security may be subject to a
greater risk of default than other comparable securities in the event of adverse
economic, political or business developments that may affect such region and,
ultimately, the ability of residential homeowners to make payments of principal
and interest on the underlying mortgages.

     Collateralized Mortgage Obligations (CMOs).  A CMO is a hybrid between a
mortgage-backed bond and a mortgage pass-through security.  Similar to a bond,
interest and prepaid principal is paid, in most cases, semi-annually.  CMOs may
be collateralized by whole mortgage loans, but are more typically collateralized
by portfolios of mortgage pass-through securities guaranteed by GNMA, FHLMC, or
FNMA, and their income streams.

     CMOs are structured into multiple classes, each bearing a different stated
maturity.  Actual maturity and average life will depend upon the prepayment
experience of the collateral.  CMOs provide for a modified form of call
protection through a de facto breakdown of the underlying pool of mortgages
according to how quickly the loans are repaid.  Monthly payment of principal
received from the pool of underlying mortgages, including prepayments, is first
returned to investors holding the shortest maturity class.  Investors holding
the longer maturity classes receive principal only after the first class has
been retired.  An investor is partially guarded against a sooner than desired
return of principal because of the sequential payments.

     In a typical CMO transaction, a corporation ("issuer") issues multiple
series (e.g., A, B, C, Z) of CMO bonds ("Bonds").  Proceeds of the Bond offering
are used to purchase mortgages or mortgage pass-through certificates
("Collateral").  The Collateral is pledged to a third party trustee as security
for the

                                       5
<PAGE>
 
Bonds. Principal and interest payments from the Collateral are used to pay
principal on the Bonds in the order A, B, C, Z. The Series A, B, and C Bonds all
bear current interest. Interest on the Series Z Bond is accrued and added to
principal and a like amount is paid as principal on the Series A, B, or C Bond
currently being paid off. When the Series A, B, and C Bonds are paid in full,
interest and principal on the Series Z Bond begins to be paid currently. With
some CMOs, the issuer serves as a conduit to allow loan originators (primarily
builders or savings and loan associations) to borrow against their loan
portfolios.

     FHLMC Collateralized Mortgage Obligations.  FHLMC CMOs are debt obligations
of FHLMC issued in multiple classes having different maturity dates which are
secured by the pledge of a pool of conventional mortgage loans purchased by
FHLMC.  Unlike FHLMC PCs, payments of principal and interest on the CMOs are
made semi-annually, as opposed to monthly.  The amount of principal payable on
each semiannual payment date is determined in accordance with FHLMC's mandatory
sinking fund schedule, which, in turn, is equal to approximately 100% of FHA
prepayment experience applied to the mortgage collateral pool.  All sinking fund
payments in the CMOs are allocated to the retirement of the individual classes
of bonds in the order of their stated maturities.  Payment of principal on the
mortgage loans in the collateral pool in excess of the amount of FHLMC's minimum
sinking fund obligation for any payment date are paid to the holders of the CMOs
as additional sinking fund payments.  Because of the "pass-through" nature of
all principal payments received on the collateral pool in excess of FHLMC's
minimum sinking fund requirement, the rate at which principal of the CMOs is
actually repaid is likely to be such that each class of bonds will be retired in
advance of its scheduled maturity date.

     If collection of principal (including prepayments) on the mortgage loans
during any semi-annual payment period is not sufficient to meet FHLMC's minimum
sinking fund obligation on the next sinking fund payment date, FHLMC agrees to
make up the deficiency from its general funds.

     Criteria for the mortgage loans in the pool backing the FHLMC CMOs are
identical to those of FHLMC PCs.  FHLMC has the right to substitute collateral
in the event of delinquencies and/or defaults.

     Commercial Mortgage-Backed Securities include securities that reflect an
interest in, and are secured by, mortgage loans on commercial real property.
The market for commercial mortgage-backed securities developed more recently and
in terms of total outstanding principal amount of issues is relatively small
compared to the market for residential single-family mortgage-backed securities.
Many of the risks of investing in commercial mortgage-backed securities reflect
the risks of investing in the real estate securing the underlying mortgage
loans. These risks reflect the effects of local and other economic conditions on
real estate markets, the ability of tenants to make loan payments, and the
ability of a property to attract and retain tenants.  Commercial mortgage-backed
securities may be less liquid and exhibit greater price volatility than other
types of mortgage- or asset-backed securities.

     Other Mortgage-Related Securities.  Other mortgage-related securities
include securities other than those described above that directly or indirectly
represent a participation in, or are secured by and payable from, mortgage loans
on real property, including mortgage dollar rolls, CMO residuals or stripped
mortgage-backed securities ("SMBS"). Other mortgage-related securities may be
equity or debt securities issued by agencies or instrumentalities of the U.S.
Government or by private originators of, or investors in, mortgage loans,
including savings and loan associations, homebuilders, mortgage banks,
commercial banks, investment banks, partnerships, trusts and special purpose
entities of the foregoing.

     CMO Residuals.  CMO residuals are mortgage securities issued by agencies or
instrumentalities of the U.S. Government or by private originators of, or
investors in, mortgage loans, including savings and loan associations,
homebuilders, mortgage banks, commercial banks, investment banks and special
purpose entities of the foregoing.

     The cash flow generated by the mortgage assets underlying a series of CMOs
is applied first to make required payments of principal and interest on the CMOs
and second to pay the related administrative expenses of the issuer.  The
residual in a CMO structure generally represents the interest in any excess

                                       6
<PAGE>
 
cash flow remaining after making the foregoing payments. Each payment of such
excess cash flow to a holder of the related CMO residual represents income
and/or a return of capital. The amount of residual cash flow resulting from a
CMO will depend on, among other things, the characteristics of the mortgage
assets, the coupon rate of each class of CMO, prevailing interest rates, the
amount of administrative expenses and the prepayment experience on the mortgage
assets. In particular, the yield to maturity on CMO residuals is extremely
sensitive to prepayments on the related underlying mortgage assets, in the same
manner as an interest-only ("IO") class of stripped mortgage-backed securities.
See "Other Mortgage-Related Securities--Stripped Mortgage-Backed Securities." In
addition, if a series of a CMO includes a class that bears interest at an
adjustable rate, the yield to maturity on the related CMO residual will also be
extremely sensitive to changes in the level of the index upon which interest
rate adjustments are based. As described below with respect to stripped
mortgage-backed securities, in certain circumstances a Fund may fail to recoup
fully its initial investment in a CMO residual.

     CMO residuals are generally purchased and sold by institutional investors
through several investment banking firms acting as brokers or dealers.  The CMO
residual market has only very recently developed and CMO residuals currently may
not have the liquidity of other more established securities trading in other
markets. Transactions in CMO residuals are generally completed only after
careful review of the characteristics of the securities in question.  In
addition, CMO residuals may, or pursuant to an exemption therefrom, may not have
been registered under the Securities Act of 1933, as amended (the "1933 Act").
CMO residuals, whether or not registered under the 1933 Act, may be subject to
certain restrictions on transferability, and may be deemed "illiquid" and
subject to a Fund's limitations on investment in illiquid securities.

     Stripped Mortgage-Backed Securities.  SMBS are derivative multi-class
mortgage securities.  SMBS may be issued by agencies or instrumentalities of the
U.S. Government, or by private originators of, or investors in, mortgage loans,
including savings and loan associations, mortgage banks, commercial banks,
investment banks and special purpose entities of the foregoing.

     SMBS are usually structured with two classes that receive different
proportions of the interest and principal distributions on a pool of mortgage
assets.  A common type of SMBS will have one class receiving some of the
interest and most of the principal from the mortgage assets, while the other
class will receive most of the interest and the remainder of the principal.  In
the most extreme case, one class will receive all of the interest (the "IO"
class), while the other class will receive all of the principal (the principal-
only or "PO" class).  The yield to maturity on an IO class is extremely
sensitive to the rate of principal payments (including prepayments) on the
related underlying mortgage assets, and a rapid rate of principal payments may
have a material adverse effect on a Fund's yield to maturity from these
securities. If the underlying mortgage assets experience greater than
anticipated prepayments of principal, a Fund may fail to recoup some or all of
its initial investment in these securities even if the security is in one of the
highest rating categories.

     Although SMBS are purchased and sold by institutional investors through
several investment banking firms acting as brokers or dealers, these securities
were only recently developed.  As a result, established trading markets have not
yet developed and, accordingly, these securities may be deemed "illiquid" and
subject to a Fund's limitations on investment in illiquid securities.

     Other Asset-Backed Securities.  Similarly, the Adviser expects that other
asset-backed securities (unrelated to mortgage loans) will be offered to
investors in the future.  Several types of asset-backed securities have already
been offered to investors, including Certificates for Automobile Receivables(SM)
("CARS(SM)"). CARS(SM) represent undivided fractional interests in a trust whose
assets consist of a pool of motor vehicle retail installment sales contracts and
security interests in the vehicles securing the contracts. Payments of principal
and interest on CARS(SM) are passed through monthly to certificate holders, and
are guaranteed up to certain amounts and for a certain time period by a letter
of credit issued by a financial institution unaffiliated with the trustee or
originator of the trust.  An investor's return on CARS(SM) may be affected by
early prepayment of principal on the underlying vehicle sales contracts.  If the
letter of credit is

                                       7
<PAGE>
 
exhausted, the trust may be prevented from realizing the full amount due on a
sales contract because of state law requirements and restrictions relating to
foreclosure sales of vehicles and the obtaining of deficiency judgments
following such sales or because of depreciation, damage or loss of a vehicle,
the application of federal and state bankruptcy and insolvency laws, or other
factors. As a result, certificate holders may experience delays in payments or
losses if the letter of credit is exhausted.

     Consistent with a Fund's investment objectives and policies, the Adviser
also may invest in other types of asset-backed securities.

Foreign Securities

     All Funds (except the PIMCO Low Duration II, Total Return II, Long-Term
U.S. Government and Municipal Bond Funds) may invest in corporate debt
securities of foreign issuers (including preferred or preference stock), certain
foreign bank obligations (see "Bank Obligations") and U.S. dollar or foreign
currency-denominated obligations of foreign governments or their subdivisions,
agencies and instrumentalities, international agencies and supranational
entities.  The PIMCO Money Market, High Yield, Commercial Mortgage Securities,
Low Duration Mortgage and Total Return Mortgage Funds may invest in securities
of foreign issuers only if they are U.S. dollar-denominated.

     Securities traded in certain emerging market countries, including the
emerging market countries in Eastern Europe, may be subject to risks in addition
to risks typically posed by international investing due to the inexperience of
financial intermediaries, the lack of modern technology, and the lack of a
sufficient capital base to expand business operations.  Additionally, former
Communist regimes of a number of Eastern European countries previously
expropriated a large amount of property, the claims on which have not been
entirely settled.  There can be no assurance that a Fund's investments in
Eastern Europe will not also be expropriated, nationalized or otherwise
confiscated.

     Each of the Fixed Income Funds (except the PIMCO Low Duration II, Total
Return II, Long-Term U.S. Government and Municipal Bond Funds) may invest in
Brady Bonds.  Brady Bonds are securities created through the exchange of
existing commercial bank loans to sovereign entities for new obligations in
connection with debt restructurings under a debt restructuring plan introduced
by former U.S. Secretary of the Treasury, Nicholas F. Brady (the "Brady Plan").
Brady Plan debt restructurings have been implemented in a number of countries,
including: Argentina, Bolivia, Bulgaria, Costa Rica, the Dominican Republic,
Ecuador, Jordan, Mexico, Niger, Nigeria, the Philippines, Poland, Uruguay, and
Venezuela.  In addition, Brazil has concluded a Brady-like plan.  It is expected
that other countries will undertake a Brady Plan in the future, including Panama
and Peru.

     Brady Bonds have been issued only recently, and accordingly do not have a
long payment history. Brady Bonds may be collateralized or uncollateralized, are
issued in various currencies (primarily the U.S. dollar) and are actively traded
in the over-the-counter secondary market.  U.S. dollar-denominated,
collateralized Brady Bonds, which may be fixed rate par bonds or floating rate
discount bonds, are generally collateralized in full as to principal by U.S.
Treasury zero coupon bonds having the same maturity as the Brady Bonds.
Interest payments on these Brady Bonds generally are collateralized on a one-
year or longer rolling-forward basis by cash or securities in an amount that, in
the case of fixed rate bonds, is equal to at least one year of interest payments
or, in the case of floating rate bonds, initially is equal to at least one
year's interest payments based on the applicable interest rate at that time and
is adjusted at regular intervals thereafter.  Certain Brady Bonds are entitled
to "value recovery payments" in certain circumstances, which in effect
constitute supplemental interest payments but generally are not collateralized.
Brady Bonds are often viewed as having three or four valuation components: (i)
the collateralized repayment of principal at final maturity; (ii) the
collateralized interest payments; (iii) the uncollateralized interest payments;
and (iv) any uncollateralized repayment of principal at maturity (these
uncollateralized amounts constitute the "residual risk").

                                       8
<PAGE>
 
     Most Mexican Brady Bonds issued to date have principal repayments at final
maturity fully collateralized by U.S. Treasury zero coupon bonds (or comparable
collateral denominated in other currencies) and interest coupon payments
collateralized on an 18-month rolling-forward basis by funds held in escrow by
an agent for the bondholders.  A significant portion of the Venezuelan Brady
Bonds and the Argentine Brady Bonds issued to date have principal repayments at
final maturity collateralized by U.S. Treasury zero coupon bonds (or comparable
collateral denominated in other currencies) and/or interest coupon payments
collateralized on a 14-month (for Venezuela) or 12-month (for Argentina)
rolling-forward basis by securities held by the Federal Reserve Bank of New York
as collateral agent.

     Brady Bonds involve various risk factors including residual risk and the
history of defaults with respect to commercial bank loans by public and private
entities of countries issuing Brady Bonds.  There can be no assurance that Brady
Bonds in which the Funds may invest will not be subject to restructuring
arrangements or to requests for new credit, which may cause the Funds to suffer
a loss of interest or principal on any of its holdings.

     Investment in sovereign debt can involve a high degree of risk.  The
governmental entity that controls the repayment of sovereign debt may not be
able or willing to repay the principal and/or interest when due in accordance
with the terms of the debt.  A governmental entity's willingness or ability to
repay principal and interest due in a timely manner may be affected by, among
other factors, its cash flow situation, the extent of its foreign reserves, the
availability of sufficient foreign exchange on the date a payment is due, the
relative size of the debt service burden to the economy as a whole, the
governmental entity's policy toward the International Monetary Fund, and the
political constraints to which a governmental entity may be subject.
Governmental entities may also depend on expected disbursements from foreign
governments, multilateral agencies and others to reduce principal and interest
arrearages on their debt.  The commitment on the part of these governments,
agencies and others to make such disbursements may be conditioned on a
governmental entity's implementation of economic reforms and/or economic
performance and the timely service of such debtor's obligations.  Failure to
implement such reforms, achieve such levels of economic performance or repay
principal or interest when due may result in the cancellation of such third
parties' commitments to lend funds to the governmental entity, which may further
impair such debtor's ability or willingness to service its debts in a timely
manner.  Consequently, governmental entities may default on their sovereign
debt.  Holders of sovereign debt (including the Funds) may be requested to
participate in the rescheduling of such debt and to extend further loans to
governmental entities.  There is no bankruptcy proceeding by which sovereign
debt on which governmental entities have defaulted may be collected in whole or
in part.

     Each of the PIMCO Emerging Markets Bond Fund and PIMCO Emerging Markets
Bond Fund II will consider an issuer to be economically tied to a country with
an emerging securities market if (1) the issuer is organized under the laws of,
or maintains its principal place of business in, the country, (2) its securities
are principally traded in the country's securities markets, or (3) the issuer
derived at least half of its revenues or profits from goods produced or sold,
investments made, or services performed in the country, or has at least half of
its assets in that country.

Foreign Currency Transactions

     All Funds that may invest in foreign currency-denominated securities also
may purchase and sell foreign currency options and foreign currency futures
contracts and related options (see "Derivative Instruments"), and may engage in
foreign currency transactions either on a spot (cash) basis at the rate
prevailing in the currency exchange market at the time or through forward
currency contracts ("forwards") with terms generally of less than one year.
Funds may engage in these transactions in order to protect against uncertainty
in the level of future foreign exchange rates in the purchase and sale of
securities.  The Funds may also use foreign currency options and foreign
currency forward contracts to increase exposure to a foreign currency or to
shift exposure to foreign currency fluctuations from one country to another.

                                       9
<PAGE>
 
     A forward involves an obligation to purchase or sell a specific currency at
a future date, which may be any fixed number of days from the date of the
contract agreed upon by the parties, at a price set at the time of the contract.
These contracts may be bought or sold to protect a Fund against a possible loss
resulting from an adverse change in the relationship between foreign currencies
and the U.S. dollar or to increase exposure to a particular foreign currency.
Open positions in forwards used for non-hedging purposes will be covered by the
segregation with the Trust's custodian of assets determined to be liquid by the
Adviser in accordance with procedures established by the Board of Trustees, and
are marked to market daily.  Although forwards are intended to minimize the risk
of loss due to a decline in the value of the hedged currencies, at the same
time, they tend to limit any potential gain which might result should the value
of such currencies increase.  Forwards will be used primarily to adjust the
foreign exchange exposure of each Fund with a view to protecting the outlook,
and the Funds might be expected to enter into such contracts under the following
circumstances:

     Lock In.  When the Adviser desires to lock in the U.S. dollar price on the
purchase or sale of a security denominated in a foreign currency.

     Cross Hedge.  If a particular currency is expected to decrease against
another currency, a Fund may sell the currency expected to decrease and purchase
a currency which is expected to increase against the currency sold in an amount
approximately equal to some or all of the Fund's portfolio holdings denominated
in the currency sold.

     Direct Hedge.  If the Adviser wants to a eliminate substantially all of the
risk of owning a particular currency, and/or if the Adviser thinks that a Fund
can benefit from price appreciation in a given country's bonds but does not want
to hold the currency, it may employ a direct hedge back into the U.S. dollar.
In either case, a Fund would enter into a forward contract to sell the currency
in which a portfolio security is denominated and purchase U.S. dollars at an
exchange rate established at the time it initiated the contract.  The cost of
the direct hedge transaction may offset most, if not all, of the yield advantage
offered by the foreign security, but a Fund would hope to benefit from an
increase (if any) in value of the bond.

     Proxy Hedge.  The Adviser might choose to use a proxy hedge, which may be
less costly than a direct hedge.  In this case, a Fund, having purchased a
security, will sell a currency whose value is believed to be closely linked to
the currency in which the security is denominated.  Interest rates prevailing in
the country whose currency was sold would be expected to be closer to those in
the U.S. and lower than those of securities denominated in the currency of the
original holding.  This type of hedging entails greater risk than a direct hedge
because it is dependent on a stable relationship between the two currencies
paired as proxies and the relationships can be very unstable at times.

     Costs of Hedging.  When a Fund purchases a foreign bond with a higher
interest rate than is available on U.S. bonds of a similar maturity, the
additional yield on the foreign bond could be substantially reduced or lost if
the Fund were to enter into a direct hedge by selling the foreign currency and
purchasing the U.S. dollar.  This is what is known as the "cost" of hedging.
Proxy hedging attempts to reduce this cost through an indirect hedge back to the
U.S. dollar.

     It is important to note that hedging costs are treated as capital
transactions and are not, therefore, deducted from a Fund's dividend
distribution and are not reflected in its yield.  Instead such costs will, over
time, be reflected in a Fund's net asset value per share.

     Tax Consequences of Hedging.  Under applicable tax law, the Funds may be
required to limit their gains from hedging in foreign currency forwards,
futures, and options.  Although the Funds are expected to comply with such
limits, the extent to which these limits apply is subject to tax regulations as
yet unissued.  Hedging may also result in the application of the marked-to-
market and straddle provisions of the Internal Revenue Code.  Those provisions
could result in an increase (or decrease) in the amount of taxable dividends
paid by the Funds and could affect whether dividends paid by the Funds are
classified as capital gains or ordinary income.

                                       10
<PAGE>
 
Foreign Currency Exchange-Related Securities

     Foreign currency warrants.  Foreign currency warrants such as Currency
Exchange Warrants(SM) ("CEWs(SM)") are warrants which entitle the holder to
receive from their issuer an amount of cash (generally, for warrants issued in
the United States, in U.S. dollars) which is calculated pursuant to a
predetermined formula and based on the exchange rate between a specified foreign
currency and the U.S. dollar as of the exercise date of the warrant. Foreign
currency warrants generally are exercisable upon their issuance and expire as of
a specified date and time. Foreign currency warrants have been issued in
connection with U.S. dollar-denominated debt offerings by major corporate
issuers in an attempt to reduce the foreign currency exchange risk which, from
the point of view of prospective purchasers of the securities, is inherent in
the international fixed-income marketplace. Foreign currency warrants may
attempt to reduce the foreign exchange risk assumed by purchasers of a security
by, for example, providing for a supplemental payment in the event that the U.S.
dollar depreciates against the value of a major foreign currency such as the
Japanese Yen or German Deutschmark. The formula used to determine the amount
payable upon exercise of a foreign currency warrant may make the warrant
worthless unless the applicable foreign currency exchange rate moves in a
particular direction (e.g., unless the U.S. dollar appreciates or depreciates
against the particular foreign currency to which the warrant is linked or
indexed). Foreign currency warrants are severable from the debt obligations with
which they may be offered, and may be listed on exchanges. Foreign currency
warrants may be exercisable only in certain minimum amounts, and an investor
wishing to exercise warrants who possesses less than the minimum number required
for exercise may be required either to sell the warrants or to purchase
additional warrants, thereby incurring additional transaction costs. In the case
of any exercise of warrants, there may be a time delay between the time a holder
of warrants gives instructions to exercise and the time the exchange rate
relating to exercise is determined, during which time the exchange rate could
change significantly, thereby affecting both the market and cash settlement
values of the warrants being exercised. The expiration date of the warrants may
be accelerated if the warrants should be delisted from an exchange or if their
trading should be suspended permanently, which would result in the loss of any
remaining "time value" of the warrants (i.e., the difference between the current
market value and the exercise value of the warrants), and, in the case the
warrants were "out-of-the-money," in a total loss of the purchase price of the
warrants. Warrants are generally unsecured obligations of their issuers and are
not standardized foreign currency options issued by the Options Clearing
Corporation ("OCC"). Unlike foreign currency options issued by OCC, the terms of
foreign exchange warrants generally will not be amended in the event of
governmental or regulatory actions affecting exchange rates or in the event of
the imposition of other regulatory controls affecting the international currency
markets. The initial public offering price of foreign currency warrants is
generally considerably in excess of the price that a commercial user of foreign
currencies might pay in the interbank market for a comparable option involving
significantly larger amounts of foreign currencies. Foreign currency warrants
are subject to significant foreign exchange risk, including risks arising from
complex political or economic factors.

     Principal exchange rate linked securities.  Principal exchange rate linked
securities ("PERLs(SM)") are debt obligations the principal on which is payable
at maturity in an amount that may vary based on the exchange rate between the
U.S. dollar and a particular foreign currency at or about that time. The return
on "standard" principal exchange rate linked securities is enhanced if the
foreign currency to which the security is linked appreciates against the U.S.
dollar, and is adversely affected by increases in the foreign exchange value of
the U.S. dollar; "reverse" principal exchange rate linked securities are like
the "standard" securities, except that their return is enhanced by increases in
the value of the U.S. dollar and adversely impacted by increases in the value of
foreign currency. Interest payments on the securities are generally made in U.S.
dollars at rates that reflect the degree of foreign currency risk assumed or
given up by the purchaser of the notes (i.e., at relatively higher interest
rates if the purchaser has assumed some of the foreign exchange risk, or
relatively lower interest rates if the issuer has assumed some of the foreign
exchange risk, based on the expectations of the current market). Principal
exchange rate linked securities may in limited cases be subject to acceleration
of maturity (generally, not without the consent of the holders

                                      11
<PAGE>
 
of the securities), which may have an adverse impact on the value of the
principal payment to be made at maturity.

     Performance indexed paper.  Performance indexed paper ("PIPs(SM)") is U.S.
dollar-denominated commercial paper the yield of which is linked to certain
foreign exchange rate movements.  The yield to the investor on performance
indexed paper is established at maturity as a function of spot exchange rates
between the U.S. dollar and a designated currency as of or about that time
(generally, the index maturity two days prior to maturity).  The yield to the
investor will be within a range stipulated at the time of purchase of the
obligation, generally with a guaranteed minimum rate of return that is below,
and a potential maximum rate of return that is above, market yields on U.S.
dollar-denominated commercial paper, with both the minimum and maximum rates of
return on the investment corresponding to the minimum and maximum values of the
spot exchange rate two business days prior to maturity.

Bank Obligations

     Bank obligations in which the Funds may invest include certificates of
deposit, bankers' acceptances, and fixed time deposits.  Certificates of deposit
are negotiable certificates issued against funds deposited in a commercial bank
for a definite period of time and earning a specified return.  Bankers'
acceptances are negotiable drafts or bills of exchange, normally drawn by an
importer or exporter to pay for specific merchandise, which are "accepted" by a
bank, meaning, in effect, that the bank unconditionally agrees to pay the face
value of the instrument on maturity. Fixed time deposits are bank obligations
payable at a stated maturity date and bearing interest at a fixed rate.  Fixed
time deposits may be withdrawn on demand by the investor, but may be subject to
early withdrawal penalties which vary depending upon market conditions and the
remaining maturity of the obligation.  There are no contractual restrictions on
the right to transfer a beneficial interest in a fixed time deposit to a third
party, although there is no market for such deposits. A Fund will not invest in
fixed time deposits which (1) are not subject to prepayment or (2) provide for
withdrawal penalties upon prepayment (other than overnight deposits) if, in the
aggregate, more than 15% of its net assets (10% in the case of the PIMCO Money
Market Fund) would be invested in such deposits, repurchase agreements maturing
in more than seven days and other illiquid assets.

     Each Fund limits its investments in United States bank obligations to
obligations of United States banks (including foreign branches) which have more
than $1 billion in total assets at the time of investment and are members of the
Federal Reserve System or are examined by the Comptroller of the Currency or
whose deposits are insured by the Federal Deposit Insurance Corporation.  A Fund
also may invest in certificates of deposit of savings and loan associations
(federally or state chartered and federally insured) having total assets in
excess of $1 billion.
   
     Each Fund (except the PIMCO Money Market, Low Duration Mortgage, Total
Return Mortgage, Commercial Mortgage Securities, High Yield and Long-Term U.S.
Government Funds) limits its investments in foreign bank obligations to United
States dollar-or foreign currency-denominated obligations of foreign banks
(including United States branches of foreign banks) which at the time of
investment (i) have more than $10 billion, or the equivalent in other
currencies, in total assets; (ii) in terms of assets are among the 75 largest
foreign banks in the world; (iii) have branches or agencies (limited purpose
offices which do not offer all banking services) in the United States; and (iv)
in the opinion of the Adviser, are of an investment quality comparable to
obligations of United States banks in which the Funds may invest.  The PIMCO
Money Market, Low Duration Mortgage, Total Return Mortgage, Commercial Mortgage
Securities, High Yield and Long-Term U.S. Government Funds may invest in the
same types of bank obligations as the other Funds, but they must be U.S. dollar-
denominated.  Subject to the Trust's limitation on concentration of no more than
25% of its assets in the securities of issuers in a particular industry, there
is no limitation on the amount of a Fund's assets which may be invested in
obligations of foreign banks which meet the conditions set forth herein.     

     Obligations of foreign banks involve somewhat different investment risks
than those affecting obligations of United States banks, including the
possibilities that their liquidity could be impaired because

                                       12
<PAGE>
 
of future political and economic developments, that their obligations may be
less marketable than comparable obligations of United States banks, that a
foreign jurisdiction might impose withholding taxes on interest income payable
on those obligations, that foreign deposits may be seized or nationalized, that
foreign governmental restrictions such as exchange controls may be adopted which
might adversely affect the payment of principal and interest on those
obligations and that the selection of those obligations may be more difficult
because there may be less publicly available information concerning foreign
banks or the accounting, auditing and financial reporting standards, practices
and requirements applicable to foreign banks may differ from those applicable to
United States banks. Foreign banks are not generally subject to examination by
any U.S. Government agency or instrumentality.

Loan Participations

     Each Fund (except the PIMCO Municipal Bond Fund) may purchase
participations in commercial loans. Such indebtedness may be secured or
unsecured.  Loan participations typically represent direct participation in a
loan to a corporate borrower, and generally are offered by banks or other
financial institutions or lending syndicates.  When purchasing loan
participations, a Fund assumes the credit risk associated with the corporate
borrower and may assume the credit risk associated with an interposed bank or
other financial intermediary.  The participation interests in which a Fund
intends to invest may not be rated by any nationally recognized rating service.

     A loan is often administered by an agent bank acting as agent for all
holders.  The agent bank administers the terms of the loan, as specified in the
loan agreement.  In addition, the agent bank is normally responsible for the
collection of principal and interest payments from the corporate borrower and
the apportionment of these payments to the credit of all institutions which are
parties to the loan agreement. Unless, under the terms of the loan or other
indebtedness, a Fund has direct recourse against the corporate borrower, the
Fund may have to rely on the agent bank or other financial intermediary to apply
appropriate credit remedies against a corporate borrower.

     A financial institution's employment as agent bank might be terminated in
the event that it fails to observe a requisite standard of care or becomes
insolvent.  A successor agent bank would generally be appointed to replace the
terminated agent bank, and assets held by the agent bank under the loan
agreement should remain available to holders of such indebtedness.  However, if
assets held by the agent bank for the benefit of a Fund were determined to be
subject to the claims of the agent bank's general creditors, the Fund might
incur certain costs and delays in realizing payment on a loan or loan
participation and could suffer a loss of principal and/or interest.  In
situations involving other interposed financial institutions (e.g., an insurance
company or governmental agency) similar risks may arise.

     Purchasers of loans and other forms of direct indebtedness depend primarily
upon the creditworthiness of the corporate borrower for payment of principal and
interest.  If a Fund does not receive scheduled interest or principal payments
on such indebtedness, the Fund's share price and yield could be adversely
affected.  Loans that are fully secured offer a Fund more protection than an
unsecured loan in the event of non-payment of scheduled interest or principal.
However, there is no assurance that the liquidation of collateral from a secured
loan would satisfy the corporate borrower's obligation, or that the collateral
can be liquidated.

     The Funds may invest in loan participations with credit quality comparable
to that of issuers of its securities investments.  Indebtedness of companies
whose creditworthiness is poor involves substantially greater risks, and may be
highly speculative.  Some companies may never pay off their indebtedness, or may
pay only a small fraction of the amount owed.  Consequently, when investing in
indebtedness of companies with poor credit, a Fund bears a substantial risk of
losing the entire amount invested.

     Each Fund limits the amount of its total assets that it will invest in any
one issuer or in issuers within the same industry (see "Investment
Restrictions").  For purposes of these limits, a Fund generally will treat the
corporate borrower as the "issuer" of indebtedness held by the Fund. In the case
of loan

                                       13
<PAGE>
 
participations where a bank or other lending institution serves as a financial
intermediary between a Fund and the corporate borrower, if the participation
does not shift to the Fund the direct debtor-creditor relationship with the
corporate borrower, Securities and Exchange Commission ("SEC") interpretations
require the Fund to treat both the lending bank or other lending institution and
the corporate borrower as "issuers" for the purposes of determining whether the
Fund has invested more than 5% of its total assets in a single issuer. Treating
a financial intermediary as an issuer of indebtedness may restrict a Funds'
ability to invest in indebtedness related to a single financial intermediary, or
a group of intermediaries engaged in the same industry, even if the underlying
borrowers represent many different companies and industries.
    
     Loans and other types of direct indebtedness may not be readily marketable
and may be subject to restrictions on resale.  In some cases, negotiations
involved in disposing of indebtedness may require weeks to complete.
Consequently, some indebtedness may be difficult or impossible to dispose of
readily at what the Adviser believes to be a fair price.  In addition, valuation
of illiquid indebtedness involves a greater degree of judgment in determining a
Fund's net asset value than if that value were based on available market
quotations, and could result in significant variations in the Fund's daily share
price.  At the same time, some loan interests are traded among certain financial
institutions and accordingly may be deemed liquid.  As the market for different
types of indebtedness develops, the liquidity of these instruments is expected
to improve. In addition, the Funds currently intend to treat indebtedness for
which there is no readily available market as illiquid for purposes of the
Funds' limitation on illiquid investments. Investments in loan participations
are considered to be debt obligations for purposes of the Trust's investment
restriction relating to the lending of funds or assets by a Portfolio.      

     Investments in loans through a direct assignment of the financial
institution's interests with respect to the loan may involve additional risks to
the Funds.  For example, if a loan is foreclosed, a Fund could become part owner
of any collateral, and would bear the costs and liabilities associated with
owning and disposing of the collateral.  In addition, it is conceivable that
under emerging legal theories of lender liability, a Fund could be held liable
as co-lender.  It is unclear whether loans and other forms of direct
indebtedness offer securities law protections against fraud and
misrepresentation.  In the absence of definitive regulatory guidance, the Funds
rely on the Adviser's research in an attempt to avoid situations where fraud or
misrepresentation could adversely affect the Funds.

Delayed Funding Loans and Revolving Credit Facilities
    
The Funds (except the PIMCO Money Market and Municipal Bond Funds) may enter
into, or acquire participations in, delayed funding loans and revolving credit
facilities. Delayed funding loans and revolving credit facilities are borrowing
arrangements in which the lender agrees to make loans up to a maximum amount
upon demand by the borrower during a specified term.  These commitments may have
the effect of requiring a Fund to increase its investment in a company at a time
when it might not otherwise decide to do so (including at a time when the
company's financial condition makes it unlikely that such amounts will be
repaid). To the extent that a Fund is committed to advance additional funds, it
will at all times segregate assets, determined to be liquid by the Adviser in
accordance with procedures established by the Board of Trustees, in an amount
sufficient to meet such commitments.  The Funds may invest in delayed funding
loans and revolving credit facilities with credit quality comparable to that of
issuers of its securities investments. Delayed funding loans and revolving
credit facilities may be subject to restrictions on transfer, and only limited
opportunities may exist to resell such instruments. As a result, a Fund may be
unable to sell such investments at an opportune time or may have to resell them
at less than fair market value. The Funds currently intend to treat delayed
funding loans and revolving credit facilities for which there is no readily
available market as illiquid for purposes of the Funds' limitation on illiquid
investments.  For a further discussion of the risks involved in investing in
loan participations and other forms of direct indebtedness see "Loan
Participations."  Participation interests in revolving credit facilities will be
subject to the limitations discussed in "Loan Participations."  Delayed funding
loans and revolving credit facilities are considered to be debt obligations for
purposes of the Trust's investment restriction relating to the lending of funds
or assets by a Portfolio.      

                                       14
<PAGE>
 
Short Sales

     Certain of the Funds, particularly the PIMCO StocksPLUS Short Strategy
Fund, may make short sales of securities as part of their overall portfolio
management strategies involving the use of derivative instruments and to offset
potential declines in long positions in similar securities.  A short sale is a
transaction in which a Fund sells a security it does not own in anticipation
that the market price of that security will decline.

     When a Fund makes a short sale, it must borrow the security sold short and
deliver it to the broker-dealer through which it made the short sale as
collateral for its obligation to deliver the security upon conclusion of the
sale.  The Fund may have to pay a fee to borrow particular securities and is
often obligated to pay over any accrued interest on such borrowed securities.

     If the price of the security sold short increases between the time of the
short sale and the time and the Fund replaces the borrowed security, the Fund
will incur a loss; conversely, if the price declines, the Fund will realize a
capital gain.  Any gain will be decreased, and any loss increased, by the
transaction costs described above.  The successful use of short selling may be
adversely affected by imperfect correlation between movements in the price of
the security sold short and the securities being hedged.
    
     To the extent that a Fund engages in short sales, it will provide
collateral to the broker-dealer and (except in the case of short sales "against
the box") will maintain additional asset coverage in the form of segregated
assets determined to be liquid by the Adviser in accordance with procedures
established by the Board of Trustees.  Each Fund, except the PIMCO StocksPLUS
Short Strategy Fund, does not intend to enter into short sales (other than those
"against the box") if immediately after such sale the aggregate of the value of
all collateral plus the amount of the segregated assets exceeds one-third of the
value of the Fund's net assets.  This percentage may be varied by action of the
Trustees.  A short sale is "against the box" to the extent that the Fund
contemporaneously owns, or has the right to obtain at no added cost, securities
identical to those sold short.  The Funds will engage in short selling to the
extent permitted by the 1940 Act and rules and interpretations thereunder.  The
PIMCO Global Bond Fund II may only engage in short sales that are "against the
box."      

Derivative Instruments

     In pursuing their individual objectives the Funds may, as described in the
Prospectuses, purchase and sell (write) both put options and call options on
securities, securities indexes, and foreign currencies, and enter into interest
rate, foreign currency and index futures contracts and purchase and sell options
on such futures contracts ("futures options") for hedging purposes, except that
those Funds that may not invest in foreign currency-denominated securities may
not enter into transactions involving currency futures or options.  The Funds
(except the PIMCO Money Market and Municipal Bond Funds) also may purchase and
sell foreign currency options for purposes of increasing exposure to a foreign
currency or to shift exposure to foreign currency fluctuations from one country
to another.  The Funds (except the PIMCO Money Market and Municipal Bond Funds)
also may enter into swap agreements with respect to foreign currencies, interest
rates and indexes of securities.  The Funds may invest in structured notes.  If
other types of financial instruments, including other types of options, futures
contracts, or futures options are traded in the future, a Fund may also use
those instruments, provided that the Trustees determine that their use is
consistent with the Fund's investment objective.

     Options on Securities and Indexes.  A Fund may, to the extent specified for
the Fund in the Prospectuses, purchase and sell both put and call options on
fixed income or other securities or indexes in standardized contracts traded on
foreign or domestic securities exchanges, boards of trade, or similar entities,
or quoted on NASDAQ or on a regulated foreign over-the-counter market, and
agreements, sometimes called cash puts, which may accompany the purchase of a
new issue of bonds from a dealer.

                                       15
<PAGE>
 
     An option on a security (or index) is a contract that gives the holder of
the option, in return for a premium, the right to buy from (in the case of a
call) or sell to (in the case of a put) the writer of the option the security
underlying the option (or the cash value of the index) at a specified exercise
price at any time during the term of the option.  The writer of an option on a
security has the obligation upon exercise of the option to deliver the
underlying security upon payment of the exercise price or to pay the exercise
price upon delivery of the underlying security.  Upon exercise, the writer of an
option on an index is obligated to pay the difference between the cash value of
the index and the exercise price multiplied by the specified multiplier for the
index option.  (An index is designed to reflect features of a particular
financial or securities market, a specific group of financial instruments or
securities, or certain economic indicators.)
    
     A Fund will write call options and put options only if they are "covered."
In the case of a call option on a security, the option is "covered" if the Fund
owns the security underlying the call or has an absolute and immediate right to
acquire that security without additional cash consideration (or, if additional
cash consideration is required, cash or other assets determined to be liquid by
the Adviser in accordance with procedures established by the Board of Trustees,
in such amount are segregated by its custodian) upon conversion or exchange of
other securities held by the Fund.  For a call option on an index, the option is
covered if the Fund maintains with its custodian assets determined to be liquid
by the Adviser in accordance with procedures established by the Board of
Trustees, in an amount equal to the contract value of the index.  A call option
is also covered if the Fund holds a call on the same security or index as the
call written where the exercise price of the call held is (i) equal to or less
than the exercise price of the call written, or (ii) greater than the exercise
price of the call written, provided the difference is maintained by the Fund in
segregated assets determined to be liquid by the Adviser in accordance with
procedures established by the Board of Trustees.  A put option on a security or
an index is "covered" if the Fund segregates assets determined to be liquid by
the Adviser in accordance with procedures established by the Board of Trustees
equal to the exercise price.  A put option is also covered if the Fund holds a
put on the same security or index as the put written where the exercise price of
the put held is (i) equal to or greater than the exercise price of the put
written, or (ii) less than the exercise price of the put written, provided the
difference is maintained by the Fund in segregated assets determined to be
liquid by the Adviser in accordance with procedures established by the Board of
Trustees.      

     If an option written by a Fund expires unexercised, the Fund realizes a
capital gain equal to the premium received at the time the option was written.
If an option purchased by a Fund expires unexercised, the Fund realizes a
capital loss equal to the premium paid.  Prior to the earlier of exercise or
expiration, an exchange traded option may be closed out by an offsetting
purchase or sale of an option of the same series (type, exchange, underlying
security or index, exercise price, and expiration).  There can be no assurance,
however, that a closing purchase or sale transaction can be effected when the
Fund desires.

     A Fund will realize a capital gain from a closing purchase transaction if
the cost of the closing option is less than the premium received from writing
the option, or, if it is more, the Fund will realize a capital loss.  If the
premium received from a closing sale transaction is more than the premium paid
to purchase the option, the Fund will realize a capital gain or, if it is less,
the Fund will realize a capital loss. The principal factors affecting the market
value of a put or a call option include supply and demand, interest rates, the
current market price of the underlying security or index in relation to the
exercise price of the option, the volatility of the underlying security or
index, and the time remaining until the expiration date.

     The premium paid for a put or call option purchased by a Fund is an asset
of the Fund.  The premium received for an option written by a Fund is recorded
as a deferred credit.  The value of an option purchased or written is marked to
market daily and is valued at the closing price on the exchange on which it is
traded or, if not traded on an exchange or no closing price is available, at the
mean between the last bid and asked prices.

     The Funds may write covered straddles consisting of a combination of a call
and a put written on the same underlying security.  A straddle will be covered
when sufficient assets are deposited to meet the

                                       16
<PAGE>
 
Funds' immediate obligations. The Funds may use the same liquid assets to cover
both the call and put options where the exercise price of the call and put are
the same, or the exercise price of the call is higher than that of the put. In
such cases, the Funds will also segregate liquid assets equivalent to the
amount, if any, by which the put is "in the money."

     Risks Associated with Options on Securities and Indexes.  There are several
risks associated with transactions in options on securities and on indexes.  For
example, there are significant differences between the securities and options
markets that could result in an imperfect correlation between these markets,
causing a given transaction not to achieve its objectives.  A decision as to
whether, when and how to use options involves the exercise of skill and
judgment, and even a well-conceived transaction may be unsuccessful to some
degree because of market behavior or unexpected events.

     There can be no assurance that a liquid market will exist when a Fund seeks
to close out an option position.  If a Fund were unable to close out an option
that it had purchased on a security, it would have to exercise the option in
order to realize any profit or the option may expire worthless. If a Fund were
unable to close out a covered call option that it had written on a security, it
would not be able to sell the underlying security unless the option expired
without exercise.  As the writer of a covered call option, a Fund forgoes,
during the option's life, the opportunity to profit from increases in the market
value of the security covering the call option above the sum of the premium and
the exercise price of the call.

     If trading were suspended in an option purchased by a Fund, the Fund would
not be able to close out the option.  If restrictions on exercise were imposed,
the Fund might be unable to exercise an option it has purchased. Except to the
extent that a call option on an index written by the Fund is covered by an
option on the same index purchased by the Fund, movements in the index may
result in a loss to the Fund; however, such losses may be mitigated by changes
in the value of the Fund's securities during the period the option was
outstanding.

     Foreign Currency Options.  A Fund may buy or sell put and call options on
foreign currencies either on exchanges or in the over-the-counter market, as
specified for that Fund in the Prospectuses.  A put option on a foreign currency
gives the purchaser of the option the right to sell a foreign currency at the
exercise price until the option expires.  A call option on a foreign currency
gives the purchaser of the option the right to purchase the currency at the
exercise price until the option expires.  Currency options traded on U.S. or
other exchanges may be subject to position limits which may limit the ability of
a Fund to reduce foreign currency risk using such options. Over-the-counter
options differ from traded options in that they are two-party contracts with
price and other terms negotiated between buyer and seller, and generally do not
have as much market liquidity as exchange-traded options.

     Futures Contracts and Options on Futures Contracts.  A Fund may use
interest rate, foreign currency or index futures contracts, as specified for
that Fund in the Prospectuses.  An interest rate, foreign currency or index
futures contract provides for the future sale by one party and purchase by
another party of a specified quantity of a financial instrument, foreign
currency or the cash value of an index at a specified price and time.  A futures
contract on an index is an agreement pursuant to which two parties agree to take
or make delivery of an amount of cash equal to the difference between the value
of the index at the close of the last trading day of the contract and the price
at which the index contract was originally written. Although the value of an
index might be a function of the value of certain specified securities, no
physical delivery of these securities is made.  A public market exists in
futures contracts covering a number of indexes as well as financial instruments
and foreign currencies, including: the S&P 500; the S&P Midcap 400; the Nikkei
225; the NYSE composite; U.S. Treasury bonds; U.S. Treasury notes; GNMA
Certificates; three-month U.S. Treasury bills; 90-day commercial paper; bank
certificates of deposit; Eurodollar certificates of deposit; the Australian
dollar; the Canadian dollar; the British pound; the German mark; the Japanese
yen; the French franc; the Swiss franc; the Mexican peso; and certain
multinational currencies, such as the European Currency Unit ("ECU").  It is
expected that other futures contracts will be developed and traded in the
future.

                                       17
<PAGE>
 
     A Fund may purchase and write call and put futures options, as specified
for that Fund in the Prospectuses.  Futures options possess many of the same
characteristics as options on securities and indexes (discussed above).  A
futures option gives the holder the right, in return for the premium paid, to
assume a long position (call) or short position (put) in a futures contract at a
specified exercise price at any time during the period of the option.  Upon
exercise of a call option, the holder acquires a long position in the futures
contract and the writer is assigned the opposite short position.  In the case of
a put option, the opposite is true.

     To comply with applicable rules of the Commodity Futures Trading Commission
("CFTC") under which the Trust and the Funds avoid being deemed a "commodity
pool" or a "commodity pool operator," each Fund intends generally to limit its
use of futures contracts and futures options to "bona fide hedging"
transactions, as such term is defined in applicable regulations, interpretations
and practice.  For example, a Fund might use futures contracts to hedge against
anticipated changes in interest rates that might adversely affect either the
value of the Fund's securities or the price of the securities which the Fund
intends to purchase.  A Fund's hedging activities may include sales of futures
contracts as an offset against the effect of expected increases in interest
rates, and purchases of futures contracts as an offset against the effect of
expected declines in interest rates.  Although other techniques could be used to
reduce that Fund's exposure to interest rate fluctuations, the Fund may be able
to hedge its exposure more effectively and perhaps at a lower cost by using
futures contracts and futures options.

     A Fund will only enter into futures contracts and futures options which are
standardized and traded on a U.S. or foreign exchange, board of trade, or
similar entity, or quoted on an automated quotation system.

     When a purchase or sale of a futures contract is made by a Fund, the Fund
is required to deposit with its custodian (or broker, if legally permitted) a
specified amount of assets determined to be liquid by the Adviser in accordance
with procedures established by the Board of Trustees ("initial margin").  The
margin required for a futures contract is set by the exchange on which the
contract is traded and may be modified during the term of the contract.  Margin
requirements on foreign exchanges may be different than U.S. exchanges.  The
initial margin is in the nature of a performance bond or good faith deposit on
the futures contract which is returned to the Fund upon termination of the
contract, assuming all contractual obligations have been satisfied.  Each Fund
expects to earn interest income on its initial margin deposits.  A futures
contract held by a Fund is valued daily at the official settlement price of the
exchange on which it is traded.  Each day the Fund pays or receives cash, called
"variation margin," equal to the daily change in value of the futures contract.
This process is known as "marking to market."  Variation margin does not
represent a borrowing or loan by a Fund but is instead a settlement between the
Fund and the broker of the amount one would owe the other if the futures
contract expired.  In computing daily net asset value, each Fund will mark to
market its open futures positions.

     A Fund is also required to deposit and maintain margin with respect to put
and call options on futures contracts written by it.  Such margin deposits will
vary depending on the nature of the underlying futures contract (and the related
initial margin requirements), the current market value of the option, and other
futures positions held by the Fund.

     Although some futures contracts call for making or taking delivery of the
underlying securities, generally these obligations are closed out prior to
delivery by offsetting purchases or sales of matching futures contracts (same
exchange, underlying security or index, and delivery month).  If an offsetting
purchase price is less than the original sale price, the Fund realizes a capital
gain, or if it is more, the Fund realizes a capital loss. Conversely, if an
offsetting sale price is more than the original purchase price, the Fund
realizes a capital gain, or if it is less, the Fund realizes a capital loss.
The transaction costs must also be included in these calculations.

     The Funds may write covered straddles consisting of a call and a put
written on the same underlying futures contract.  A straddle will be covered
when sufficient assets are deposited to meet the

                                       18
<PAGE>
 
Funds' immediate obligations. A Fund may use the same liquid assets to cover
both the call and put options where the exercise price of the call and put are
the same, or the exercise price of the call is higher than that of the put. In
such cases, the Funds will also segregate liquid assets equivalent to the
amount, if any, by which the put is "in the money."

     Limitations on Use of Futures and Futures Options.  In general, the Funds
intend to enter into positions in futures contracts and related options only for
"bona fide hedging" purposes.  With respect to positions in futures and related
options that do not constitute bona fide hedging positions, a Fund will not
enter into a futures contract or futures option contract if, immediately
thereafter, the aggregate initial margin deposits relating to such positions
plus premiums paid by it for open futures option positions, less the amount by
which any such options are "in-the-money," would exceed 5% of the Fund's net
assets.  A call option is "in-the-money" if the value of the futures contract
that is the subject of the option exceeds the exercise price.  A put option is
"in-the-money" if the exercise price exceeds the value of the futures contract
that is the subject of the option.

     When purchasing a futures contract, a Fund will maintain with its custodian
(and mark-to-market on a daily basis) assets determined to be liquid by the
Adviser in accordance with procedures established by the Board of Trustees,
that, when added to the amounts deposited with a futures commission merchant as
margin, are equal to the market value of the futures contract. Alternatively,
the Fund may "cover" its position by purchasing a put option on the same futures
contract with a strike price as high or higher than the price of the contract
held by the Fund.

     When selling a futures contract, a Fund will maintain with its custodian
(and mark-to-market on a daily basis) assets determined to be liquid by the
Adviser in accordance with procedures established by the Board of Trustees, that
are equal to the market value of the instruments underlying the contract.
Alternatively, the Fund may "cover" its position by owning the instruments
underlying the contract (or, in the case of an index futures contract, a
portfolio with a volatility substantially similar to that of the index on which
the futures contract is based), or by holding a call option permitting the Fund
to purchase the same futures contract at a price no higher than the price of the
contract written by the Fund (or at a higher price if the difference is
maintained in liquid assets with the Trust's custodian).

     When selling a call option on a futures contract, a Fund will maintain with
its custodian (and mark-to-market on a daily basis) assets determined to be
liquid by the Adviser in accordance with procedures established by the Board of
Trustees, that, when added to the amounts deposited with a futures commission
merchant as margin, equal the total market value of the futures contract
underlying the call option. Alternatively, the Fund may cover its position by
entering into a long position in the same futures contract at a price no higher
than the strike price of the call option, by owning the instruments underlying
the futures contract, or by holding a separate call option permitting the Fund
to purchase the same futures contract at a price not higher than the strike
price of the call option sold by the Fund.

     When selling a put option on a futures contract, a Fund will maintain with
its custodian (and mark-to-market on a daily basis) assets determined to be
liquid by the Adviser in accordance with procedures established by the Board of
Trustees, that equal the purchase price of the futures contract, less any margin
on deposit.  Alternatively, the Fund may cover the position either by entering
into a short position in the same futures contract, or by owning a separate put
option permitting it to sell the same futures contract so long as the strike
price of the purchased put option is the same or higher than the strike price of
the put option sold by the Fund.
    
     To the extent that securities with maturities greater than one year are
used to segregate assets to cover a Fund's obligations under futures contracts
and related options, such use will not eliminate the risk of a form of leverage,
which may tend to exaggerate the effect on net asset value of any increase or
decrease in the market value of a Fund's portfolio, and may require liquidation
of portfolio positions when it is not advantageous to do so.  However, any
potential risk of leverage resulting from the use of securities with maturities
greater than one year may be mitigated by the overall duration limit on a Fund's
portfolio      

                                       19
<PAGE>
 
securities. Thus, the use of a longer-term security may require a Fund to hold
offsetting short-term securities to balance the Fund's portfolio such that the
Fund's duration does not exceed the maximum permitted for the Fund in the
Prospectuses.

     The requirements for qualification as a regulated investment company also
may limit the extent to which a Fund may enter into futures, futures options or
forward contracts.  See "Taxation."

     Risks Associated with Futures and Futures Options.  There are several risks
associated with the use of futures contracts and futures options as hedging
techniques.  A purchase or sale of a futures contract may result in losses in
excess of the amount invested in the futures contract.  There can be no
guarantee that there will be a correlation between price movements in the
hedging vehicle and in the Fund securities being hedged.  In addition, there are
significant differences between the securities and futures markets that could
result in an imperfect correlation between the markets, causing a given hedge
not to achieve its objectives.  The degree of imperfection of correlation
depends on circumstances such as variations in speculative market demand for
futures and futures options on securities, including technical influences in
futures trading and futures options, and differences between the financial
instruments being hedged and the instruments underlying the standard contracts
available for trading in such respects as interest rate levels, maturities, and
creditworthiness of issuers.  A decision as to whether, when and how to hedge
involves the exercise of skill and judgment, and even a well-conceived hedge may
be unsuccessful to some degree because of market behavior or unexpected interest
rate trends.

     Futures contracts on U.S. Government securities historically have reacted
to an increase or decrease in interest rates in a manner similar to that in
which the underlying U.S. Government securities reacted.  To the extent,
however, that the PIMCO Municipal Bond Fund enters into such futures contracts,
the value of such futures will not vary in direct proportion to the value of the
Fund's holdings of Municipal Bonds (as defined below). Thus, the anticipated
spread between the price of the futures contract and the hedged security may be
distorted due to differences in the nature of the markets.  The spread also may
be distorted by differences in initial and variation margin requirements, the
liquidity of such markets and the participation of speculators in such markets.

     Futures exchanges may limit the amount of fluctuation permitted in certain
futures contract prices during a single trading day.  The daily limit
establishes the maximum amount that the price of a futures contract may vary
either up or down from the previous day's settlement price at the end of the
current trading session.  Once the daily limit has been reached in a futures
contract subject to the limit, no more trades may be made on that day at a price
beyond that limit.  The daily limit governs only price movements during a
particular trading day and therefore does not limit potential losses because the
limit may work to prevent the liquidation of unfavorable positions.  For
example, futures prices have occasionally moved to the daily limit for several
consecutive trading days with little or no trading, thereby preventing prompt
liquidation of positions and subjecting some holders of futures contracts to
substantial losses.

     There can be no assurance that a liquid market will exist at a time when a
Fund seeks to close out a futures or a futures option position, and that Fund
would remain obligated to meet margin requirements until the position is closed.
In addition, many of the contracts discussed above are relatively new
instruments without a significant trading history.  As a result, there can be no
assurance that an active secondary market will develop or continue to exist.

     Additional Risks of Options on Securities, Futures Contracts, Options on
Futures Contracts, and Forward Currency Exchange Contracts and Options Thereon.
Options on securities, futures contracts, options on futures contracts, and
options on currencies may be traded on foreign exchanges. Such transactions may
not be regulated as effectively as similar transactions in the United States;
may not involve a clearing mechanism and related guarantees, and are subject to
the risk of governmental actions affecting trading in, or the prices of, foreign
securities.  The value of such positions also could be adversely affected by (i)
other complex foreign political, legal and economic factors, (ii) lesser
availability than in the United States of data on which to make trading
decisions, (iii) delays in the Trust's ability to act upon

                                       20
<PAGE>
 
economic events occurring in foreign markets during non-business hours in the
United States, (iv) the imposition of different exercise and settlement terms
and procedures and margin requirements than in the United States, and (v) lesser
trading volume.

     Swap Agreements.  The Funds (except the PIMCO Money Market and Municipal
Bond Funds) may enter into interest rate, index and currency exchange rate swap
agreements. These transactions are entered into in a attempt to obtain a
particular return when it is considered desirable to do so, possibly at a lower
cost to the Fund than if the Fund had invested directly in an instrument that
yielded that desired return.  Swap agreements are two party contracts entered
into primarily by institutional investors for periods ranging from a few weeks
to more than one year.  In a standard "swap" transaction, two parties agree to
exchange the returns (or differentials in rates of return) earned or realized on
particular predetermined investments or instruments, which may be adjusted for
an interest factor.  The gross returns to be exchanged or "swapped" between the
parties are generally calculated with respect to a "notional amount," i.e., the
return on or increase in value of a particular dollar amount invested at a
particular interest rate, in a particular foreign currency, or in a "basket" of
securities representing a particular index.  Forms of swap agreements include
interest rate caps, under which, in return for a premium, one party agrees to
make payments to the other to the extent that interest rates exceed a specified
rate, or "cap"; interest rate floors, under which, in return for a premium, one
party agrees to make payments to the other to the extent that interest rates
fall below a specified rate, or "floor"; and interest rate collars, under which
a party sells a cap and purchases a floor or vice versa in an attempt to protect
itself against interest rate movements exceeding given minimum or maximum
levels.
    
     Most swap agreements entered into by the Funds would calculate the
obligations of the parties to the agreement on a "net basis."  Consequently, a
Fund's current obligations (or rights) under a swap agreement will generally be
equal only to the net amount to be paid or received under the agreement based on
the relative values of the positions held by each party to the agreement (the
"net amount").  A Fund's current obligations under a swap agreement will be
accrued daily (offset against any amounts owing to the Fund) and any accrued but
unpaid net amounts owed to a swap counterparty will be covered by the
segregation of assets determined to be liquid by the Adviser in accordance with
procedures established by the Board of Trustees, to avoid any potential
leveraging of the Fund's portfolio. Obligations under swap agreements so covered
will not be construed to be "senior securities" for purposes of the Fund's
investment restriction concerning senior securities.  A Fund will not enter into
a swap agreement with any single party if the net amount owed or to be received
under existing contracts with that party would exceed 5% of the Fund's assets.
     
     Whether a Fund's use of swap agreements will be successful in furthering
its investment objective of total return will depend on the Adviser's ability to
predict correctly whether certain types of investments are likely to produce
greater returns than other investments.  Because they are two party contracts
and because they may have terms of greater than seven days, swap agreements may
be considered to be illiquid. Moreover, a Fund bears the risk of loss of the
amount expected to be received under a swap agreement in the event of the
default or bankruptcy of a swap agreement counterparty.  The Funds will enter
into swap agreements only with counterparties that meet certain standards of
creditworthiness (generally, such counterparties would have to be eligible
counterparties under the terms of the Funds' repurchase agreement guidelines).
Certain restrictions imposed on the Funds by the Internal Revenue Code may limit
the Funds' ability to use swap agreements.  The swaps market is a relatively new
market and is largely unregulated. It is possible that developments in the swaps
market, including potential government regulation, could adversely affect a
Fund's ability to terminate existing swap agreements or to realize amounts to be
received under such agreements.

     Certain swap agreements are exempt from most provisions of the Commodity
Exchange Act ("CEA") and, therefore, are not regulated as futures or commodity
option transactions under the CEA, pursuant to regulations approved by the CFTC
effective February 22, 1993.  To qualify for this exemption, a swap agreement
must be entered into by "eligible participants," which includes the following,
provided the participants' total assets exceed established levels:  a bank or
trust company, savings association or

                                       21
<PAGE>
 
credit union, insurance company, investment company subject to regulation under
the 1940 Act, commodity pool, corporation, partnership, proprietorship,
organization, trust or other entity, employee benefit plan, governmental entity,
broker-dealer, futures commission merchant, natural person, or regulated foreign
person. To be eligible, natural persons and most other entities must have total
assets exceeding $10 million; commodity pools and employee benefit plans must
have assets exceeding $5 million. In addition, an eligible swap transaction must
meet three conditions. First, the swap agreement may not be part of a fungible
class of agreements that are standardized as to their material economic terms.
Second, the creditworthiness of parties with actual or potential obligations
under the swap agreement must be a material consideration in entering into or
determining the terms of the swap agreement, including pricing, cost or credit
enhancement terms. Third, swap agreements may not be entered into and traded on
or through a multilateral transaction execution facility.

     This exemption is not exclusive, and participants may continue to rely on
existing exclusions for swaps, such as the Policy Statement issued in July 1989
which recognized a safe harbor for swap transactions from regulation as futures
or commodity option transactions under the CEA or its regulations. The Policy
Statement applies to swap transactions settled in cash that (1) have
individually tailored terms, (2) lack exchange-style offset and the use of a
clearing organization or margin system, (3) are undertaken in conjunction with a
line of business, and (4) are not marketed to the public.

     Structured Notes.  Structured notes are derivative debt securities, the
interest rate or principal of which is determined by an unrelated indicator.
Indexed securities include structured notes as well as securities other than
debt securities, the interest rate or principal of which is determined by an
unrelated indicator.  Indexed securities may include a multiplier that
multiplies the indexed element by a specified factor and, therefore, the value
of such securities may be very volatile.  To the extent a Fund invests in these
securities, however, the Adviser analyzes these securities in its overall
assessment of the effective duration of the Fund's portfolio in an effort to
monitor the Fund's interest rate risk.

Warrants to Purchase Securities

     The Funds may invest in or acquire warrants to purchase equity or fixed
income securities. Bonds with warrants attached to purchase equity securities
have many characteristics of convertible bonds and their prices may, to some
degree, reflect the performance of the underlying stock.  Bonds also may be
issued with warrants attached to purchase additional fixed income securities at
the same coupon rate.  A decline in interest rates would permit a Fund to buy
additional bonds at the favorable rate or to sell the warrants at a profit.  If
interest rates rise, the warrants would generally expire with no value.

     A Fund will not invest more than 5% of its net assets, valued at the lower
of cost or market, in warrants to purchase securities.  Warrants acquired in
units or attached to securities will be deemed without value for purposes of
this restriction.

Illiquid Securities

     The Funds may invest up to 15% of their net assets in illiquid securities
(10% in the case of the PIMCO Money Market Fund).  The term "illiquid
securities" for this purpose means securities that cannot be disposed of within
seven days in the ordinary course of business at approximately the amount at
which a Fund has valued the securities.  Illiquid securities are considered to
include, among other things, written over-the-counter options, securities or
other liquid assets being used as cover for such options, repurchase agreements
with maturities in excess of seven days, certain loan participation interests,
fixed time deposits which are not subject to prepayment or provide for
withdrawal penalties upon prepayment (other than overnight deposits), and other
securities whose disposition is restricted under the federal securities laws
(other than securities issued pursuant to Rule 144A under the 1933 Act and
certain commercial paper that the Adviser has determined to be liquid under
procedures approved by the Board of Trustees).

                                       22
<PAGE>
 
Municipal Bonds

     It is a policy of the PIMCO Municipal Bond Fund to have 80% of its net
assets invested in debt obligations the interest on which, in the opinion of
bond counsel to the issuer at the time of issuance, is exempt from federal
income tax ("Municipal Bonds").  The Fund may invest up to 10% of its net assets
in Municipal Bonds rated in the fifth highest rating category by Moody's or S&P,
or unrated obligations determined by the Adviser to be of quality comparable to
obligations so rated.  A description of these ratings is set forth in Appendix B
to the Prospectuses. The ability of the Fund to invest in securities other than
Municipal Bonds is limited by a requirement of the Internal Revenue Code that at
least 50% of the Fund's total assets be invested in Municipal Bonds at the end
of each calendar quarter.  See "Taxes."

     Municipal Bonds share the attributes of debt/fixed income securities in
general, but are generally issued by states, municipalities and other political
subdivisions, agencies, authorities and instrumentalities of states and multi-
state agencies or authorities.  The Municipal Bonds which the PIMCO Municipal
Bond Fund may purchase include general obligation bonds and limited obligation
bonds (or revenue bonds), including industrial development bonds issued pursuant
to former federal tax law.  General obligation bonds are obligations involving
the credit of an issuer possessing taxing power and are payable from such
issuer's general revenues and not from any particular source.  Limited
obligation bonds are payable only from the revenues derived from a particular
facility or class of facilities or, in some cases, from the proceeds of a
special excise or other specific revenue source.  Tax-exempt private activity
bonds and industrial development bonds generally are also revenue bonds and thus
are not payable from the issuer's general revenues.  The credit and quality of
private activity bonds and industrial development bonds are usually related to
the credit of the corporate user of the facilities.  Payment of interest on and
repayment of principal of such bonds is the responsibility of the corporate user
(and/or any guarantor).

     Under the Internal Revenue Code, certain limited obligation bonds are
considered "private activity bonds" and interest paid on such bonds is treated
as an item of tax preference for purposes of calculating federal alternative
minimum tax liability.

     The PIMCO Municipal Bond Fund may invest in municipal lease obligations.  A
lease is not a full faith and credit obligation of the issuer and is usually
backed only by the borrowing government's unsecured pledge to make annual
appropriations for lease payments. There have been challenges to the legality of
lease financing in numerous states, and, from time to time, certain
municipalities have considered not appropriating money for lease payments. In
deciding whether to purchase a lease obligation, the PIMCO Municipal Bond Fund
would assess the financial condition of the borrower, the merits of the project,
the level of public support for the project, and the legislative history of
lease financing in the state. These securities may be less readily marketable
than other municipals. The PIMCO Municipal Bond Fund may also purchase unrated
lease obligations if determined by the Adviser to be of comparable quality to
rated securities in which the Fund is permitted to invest.

     The PIMCO Municipal Bond Fund may seek to enhance its yield through the
purchase of private placements. These securities are sold through private
negotiations, usually to institutions or mutual funds, and may have resale
restrictions. Their yields are usually higher than comparable public securities
to compensate the investor for their limited marketability. The PIMCO Municipal
Bond Fund may not invest more than 15% of its net assets in illiquid securities,
including unmarketable private placements.

     Some longer-term Municipal Bonds give the investor the right to "put" or
sell the security at par (face value) within a specified number of days
following the investor's request usually one to seven days. This demand feature
enhances a security's liquidity by shortening its effective maturity and enables
it to trade at a price equal to or very close to par. If a demand feature
terminates prior to being exercised, the PIMCO Municipal Bond Fund would hold
the longer-term security, which could experience substantially more volatility.

                                       23
<PAGE>
 
     The PIMCO Municipal Bond Fund may invest in municipal warrants, which are
essentially call options on Municipal Bonds. In exchange for a premium, they
give the purchaser the right, but not the obligation, to purchase a Municipal
Bond in the future. The PIMCO Municipal Bond Fund might purchase a warrant to
lock in forward supply in an environment where the current issuance of bonds is
sharply reduced. Like options, warrants may expire worthless and they may have
reduced liquidity.  The PIMCO Municipal Bond Fund will not invest more than 5%
of its net assets in municipal warrants.

     The PIMCO Municipal Bond Fund may invest in Municipal Bonds with credit
enhancements such as letters of credit, municipal bond insurance and Standby
Bond Purchase Agreements ("SBPAs").  Letters of credit that are issued by a
third party, usually a bank, to enhance liquidity and ensure repayment of
principal and any accrued interest if the underlying Municipal Bond should
default.  Municipal bond insurance, which is usually purchased by the bond
issuer from a private, nongovernmental insurance company, provides an
unconditional and irrevocable guarantee that the insured bond's principal and
interest will be paid when due. Insurance does not guarantee the price of the
bond or the share price of any fund. The credit rating of an insured bond
reflects the credit rating of the insurer, based on its claims-paying ability.
The obligation of a municipal bond insurance company to pay a claim extends over
the life of each insured bond. Although defaults on insured Municipal Bonds have
been low to date and municipal bond insurers have met their claims, there is no
assurance this will continue. A higher-than-expected default rate could strain
the insurer's loss reserves and adversely affect its ability to pay claims to
bondholders. The number of municipal bond insurers is relatively small, and not
all of them have the highest rating. An SBPA is a liquidity facility provided to
pay the purchase price of bonds that cannot be re-marketed. The obligation of
the liquidity provider (usually a bank) is only to advance funds to purchase
tendered bonds that cannot be remarketed and does not cover principal or
interest under any other circumstances. The liquidity provider's obligations
under the SBPA are usually subject to numerous conditions, including the
continued creditworthiness of the underlying borrower.

     The PIMCO Municipal Bond Fund may invest in Residual Interest Bonds, which
are created by dividing the income stream provided by an underlying bond to
create two securities, one short term and one long term. The interest rate on
the short-term component is reset by an index or auction process normally every
seven to 35 days. After income is paid on the short-term securities at current
rates, the residual income goes to the long-term securities. Therefore, rising
short-term interest rates result in lower income for the longer-term portion,
and vice versa. The longer-term bonds can be very volatile and may be less
liquid than other Municipal Bonds of comparable maturity.  The PIMCO Municipal
Bond Fund will not invest more than 10% of its total assets in Residual Interest
Bonds.

     The PIMCO Municipal Bond Fund also may invest in participation interests.
Participation interests are various types of securities created by converting
fixed rate bonds into short-term, variable rate certificates. These securities
have been developed in the secondary market to meet the demand for short-term,
tax-exempt securities. The Fund will invest only in securities deemed tax-exempt
by a nationally recognized bond counsel, but there is no guarantee the interest
will be exempt because the IRS has not issued a definitive ruling on the matter.

     Municipal Bonds are subject to credit and market risk.  Generally, prices
of higher quality issues tend to fluctuate less with changes in market interest
rates than prices of lower quality issues and prices of longer maturity issues
tend to fluctuate more than prices of shorter maturity issues.

     The PIMCO Municipal Bond Fund may purchase and sell portfolio investments
to take advantage of changes or anticipated changes in yield relationships,
markets or economic conditions.  The Fund may also sell Municipal Bonds due to
changes in the Adviser's evaluation of the issuer or cash needs resulting from
redemption requests for Fund shares.  The secondary market for Municipal Bonds
typically has been less liquid than that for taxable debt/fixed income
securities, and this may affect the Fund's ability to sell particular Municipal
Bonds at then-current market prices, especially in periods when other investors
are attempting to sell the same securities.

                                       24
<PAGE>
 
     Prices and yields on Municipal Bonds are dependent on a variety of factors,
including general money- market conditions, the financial condition of the
issuer, general conditions of the Municipal Bond market, the size of a
particular offering, the maturity of the obligation and the rating of the issue.
A number of these factors, including the ratings of particular issues, are
subject to change from time to time. Information about the financial condition
of an issuer of Municipal Bonds may not be as extensive as that which is made
available by corporations whose securities are publicly traded.

     Obligations of issuers of Municipal Bonds are subject to the provisions of
bankruptcy, insolvency and other laws, such as the Federal Bankruptcy Reform Act
of 1978, affecting the rights and remedies of creditors. Congress or state
legislatures may seek to extend the time for payment of principal or interest,
or both, or to impose other constraints upon enforcement of such obligations.
There is also the possibility that as a result of litigation or other
conditions, the power or ability of issuers to meet their obligations for the
payment of interest and principal on their Municipal Bonds may be materially
affected or their obligations may be found to be invalid or unenforceable.  Such
litigation or conditions may from time to time have the effect of introducing
uncertainties in the market for Municipal Bonds or certain segments thereof, or
of materially affecting the credit risk with respect to particular bonds.
Adverse economic, business, legal or political developments might affect all or
a substantial portion of the Fund's Municipal Bonds in the same manner.

Social Investment Policies

     The PIMCO Low Duration Fund III and PIMCO Total Return Fund III will not,
as a matter of non-fundamental operating policy, invest in the securities of any
issuer determined by the Adviser to be engaged principally in the provision of
healthcare services, the manufacture of alcoholic beverages, tobacco products,
pharmaceuticals, military equipment, or the operation of gambling casinos.  The
Funds will also avoid, to the extent possible on the basis of information
available to the Adviser, the purchase of securities of issuers engaged in the
production or trade of pornographic materials.  An issuer will be deemed to be
principally engaged in an activity if it derives more than 10% of its gross
revenues from such activities. Evaluation of any particular issuer with respect
to these criteria may involve the exercise of subjective judgment by the
Adviser.  The Adviser's determination of issuers engaged in such activities at
any given time will, however, be based upon its good faith interpretation of
available information and its continuing and reasonable best efforts to obtain
and evaluate the most current information available, and to utilize such
information, as it becomes available, promptly and expeditiously in portfolio
management for the Funds. In making its analysis, the Adviser may rely, among
other things, upon information contained in such publications as those produced
by the Investor Responsibility Research Center, Inc.

                            INVESTMENT RESTRICTIONS

Fundamental Investment Restrictions

     Each Fund's investment objective, except for the PIMCO Global Bond Fund II,
as set forth in the Prospectuses under "Investment Objectives and Policies,"
together with the investment restrictions set forth below, are fundamental
policies of the Fund and may not be changed with respect to a Fund without
shareholder approval by vote of a majority of the outstanding shares of that
Fund.  Under these restrictions a Fund may not:

(1)  (a)  invest in a security if, as a result of such investment, more than 25%
     of its total assets (taken at market value at the time of such investment)
     would be invested in the securities of issuers in any particular industry,
     or, in the case of the PIMCO Municipal Bond Fund, in industrial development
     revenue bonds based, directly or indirectly, on the credit of private
     entities in any one industry; except that this restriction does not apply
     (a) to securities issued or guaranteed by the U.S. Government or its
     agencies or instrumentalities (or repurchase agreements with respect
     thereto) and (b) with respect to the Money Market Fund, to securities or
     obligations issued by U.S.

                                       25
<PAGE>
 
     banks. Investments of the PIMCO Municipal Bond Fund in utilities, gas,
     electric, water and telephone companies will be considered as being in
     separate industries;

     (b) for the Global Bond Fund II, concentrate more than 25% of the value of
     its total assets in any one industry (The SEC staff takes the position that
     investments in government securities of a single foreign country (including
     agencies and instrumentalities of such government, to the extent such
     obligations are backed by the assets and revenues of such government)
     represent investments in a separate industry for these purposes.);
    
(2)  with respect to 75% of its assets, invest in a security if, as a result of
     such investment, more than 5% of its total assets (taken at market value at
     the time of such investment) would be invested in the securities of any one
     issuer, except that this restriction does not apply to securities issued or
     guaranteed by the U.S. Government or its agencies or instrumentalities
     (This investment restriction is not applicable to the Real Return Bond,
     Commercial Mortgage Securities, Global Bond, Global Bond II, Foreign Bond,
     International Bond, Emerging Markets Bond or the Emerging Markets Bond II
     Funds.). For the purpose of this restriction, each state and each separate
     political subdivision, agency, authority or instrumentality of such state,
     each multi-state agency or authority, and each guarantor, if any, are
     treated as separate issuers of Municipal Bonds;      
    
(3)  with respect to 75% of its assets, invest in a security if, as a result of
     such investment, it would hold more than 10% (taken at the time of such
     investment) of the outstanding voting securities of any one issuer (This
     restriction is not applicable to the Real Return Bond, Commercial Mortgage
     Securities, Global Bond, Global Bond II, Foreign Bond, International Bond,
     Emerging Markets Bond or the Emerging Markets Bond II Funds.);      

(4)  (a)  purchase or sell real estate, although it may purchase securities
     secured by real estate or interests therein, or securities issued by
     companies which invest in real estate, or interests therein;

     (b) for the Global Bond Fund II, purchase or sell real estate, although it
     may purchase securities of issuers which deal in real estate, including
     securities of real estate investment trusts, and may purchase securities
     which are secured by interests in real estate;

(5)  purchase or sell commodities or commodities contracts or oil, gas or
     mineral programs.  This restriction shall not prohibit a Fund, subject to
     restrictions described in the Prospectuses and elsewhere in this Statement
     of Additional Information, from purchasing, selling or entering into
     futures contracts, options on futures contracts, foreign currency forward
     contracts, foreign currency options, or any interest rate, securities-
     related or foreign currency-related hedging instrument, including swap
     agreements and other derivative instruments, subject to compliance with any
     applicable provisions of the federal securities or commodities laws (This
     restriction is not applicable to the Global Bond Fund II, but see non-
     fundamental restriction "F".);
    
(6)  for the Total Return III, High Yield, International Bond and StocksPLUS
     Funds:  purchase securities on margin, except for use of short-term credit
     necessary for clearance of purchases and sales of portfolio securities, but
     it may make margin deposits in connection with transactions in options,
     futures, and options on futures;      

(7)  (a)  borrow money, issue senior securities, or pledge, mortgage or
     hypothecate its assets, except that a Fund may (i) borrow from banks or
     enter into reverse repurchase agreements, or employ similar investment
     techniques, and pledge its assets in connection therewith, but only if
     immediately after each borrowing there is asset coverage of 300% and (ii)
     enter into transactions in options, futures, options on futures, and other
     derivative instruments as described in the Prospectuses and in this
     Statement of Additional Information (the deposit of assets in escrow in
     connection with the writing of covered put and call options and the
     purchase of securities on a when-issued or delayed delivery basis,
     collateral arrangements with respect to initial or variation

                                       26
<PAGE>
 
     margin deposits for futures contracts and commitments entered into under
     swap agreements or other derivative instruments, will not be deemed to be
     pledges of a Fund's assets);

     (b) for the Global Bond Fund II, borrow money in excess of 10% of the value
     (taken at the lower of cost or current value) of the Fund's total assets
     (not including the amount borrowed) at the time the borrowing is made, and
     then only from banks as a temporary measure to facilitate the meeting of
     redemption requests (not for leverage) which might otherwise require the
     untimely disposition of portfolio investments or for extraordinary or
     emergency purposes (Such borrowings will be repaid before any additional
     investments are purchased.); or pledge, hypothecate, mortgage or otherwise
     encumber its assets in excess of 10% of the Fund's total assets (taken at
     cost) and then only to secure borrowings permitted above (The deposit of
     securities or cash or cash equivalents in escrow in connection with the
     writing of covered call or put options, respectively, is not deemed to be
     pledges or other encumbrances.  For the purpose of this restriction,
     collateral arrangements with respect to the writing of options, futures
     contracts, options on futures contracts, and collateral arrangements with
     respect to initial and variation margin are not deemed to be a pledge of
     assets and neither such arrangements nor the purchase or sale of futures or
     related options are deemed to be the issuance of a senior security.);

(8)  lend any funds or other assets, except that a Fund may, consistent with its
     investment objective and policies:  (a) invest in debt obligations,
     including bonds, debentures, or other debt securities, bankers' acceptances
     and commercial paper, even though the purchase of such obligations may be
     deemed to be the making of loans, (b) enter into repurchase agreements, and
     (c) lend its portfolio securities in an amount not to exceed one-third of
     the value of its total assets, provided such loans are made in accordance
     with applicable guidelines established by the Securities and Exchange
     Commission and the Trustees of the Trust (This restriction is not
     applicable to the Global Bond Fund II, but see non-fundamental restriction
     "G".);

(9)  (a)  act as an underwriter of securities of other issuers, except to the
     extent that in connection with the disposition of portfolio securities, it
     may be deemed to be an underwriter under the federal securities laws;

     (b) for the Global Bond Fund II, underwrite securities issued by other
     persons except to the extent that, in connection with the disposition of
     its portfolio investments, it may be deemed to be an underwriter under
     federal securities laws; or
    
(10) (a)  for the Total Return III, High Yield, and StocksPLUS Funds:  maintain
     a short position, or purchase, write or sell puts, calls, straddles,
     spreads or combinations thereof, except as set forth in the Prospectuses
     and in this Statement of Additional Information for transactions in
     options, futures, options on futures, and transactions arising under swap
     agreements or other derivative instruments;      
         
     (b) for the Money Market, Short-Term, Low Duration, Low Duration II,  Low
     Duration III, Low Duration Mortgage, Moderate Duration, Total Return, Total
     Return II, Total Return Mortgage, Commercial Mortgage Securities, Long-Term
     U.S. Government, Global Bond, Foreign Bond, International, Emerging Markets
     Bond, Emerging Markets Bond II, Strategic Balanced and StocksPLUS Short
     Strategy Funds:  maintain a short position, or purchase, write or sell
     puts, calls, straddles, spreads or combinations thereof, except on such
     conditions as may be set forth in the Prospectuses and in this Statement of
     Additional Information.      

Non-Fundamental Investment Restrictions

     Each Fund is also subject to the following non-fundamental restrictions and
policies (which may be changed without shareholder approval) relating to the
investment of its assets and activities.  Unless otherwise indicated, a Fund may
not:

                                       27
<PAGE>
 
(A)  (a) invest more than 15% of the net assets of a Fund (10% in the case of
     the PIMCO Money Market Fund) (taken at market value at the time of the
     investment) in "illiquid securities," illiquid securities being defined to
     include securities subject to legal or contractual restrictions on resale
     (which may include private placements), repurchase agreements maturing in
     more than seven days, certain loan participation interests, fixed time
     deposits which are not subject to prepayment or provide for withdrawal
     penalties upon prepayment (other than overnight deposits), certain options
     traded over the counter that a Fund has purchased, securities or other
     liquid assets being used to cover such options a Fund has written,
     securities for which market quotations are not readily available, or other
     securities which legally or in the Adviser's opinion may be deemed illiquid
     (other than securities issued pursuant to Rule 144A under the Securities
     Act of 1933 and certain commercial paper that PIMCO has determined to be
     liquid under procedures approved by the Board of Trustees);

     (b) for the Global Bond Fund II, invest in (a) securities which at the time
     of such investment are not readily marketable, (b) securities the
     disposition of which is restricted under federal securities laws, (c)
     repurchase agreements maturing in more than seven days (d) OTC options (to
     the extent described below), and (e) IO/PO stripped mortgage-backed
     securities (as defined in the Prospectuses) if, as a result, more than 15%
     of the Fund's net assets, taken at current value, would then be invested in
     securities described in (a), (b), (c), (d) and (e) above (For the purpose
     of this restriction securities subject to a 7-day put option or convertible
     into readily saleable securities or commodities are not included with
     subsections (a) or (b).); or purchase securities the disposition of which
     is restricted under the federal securities laws (excluding for purposes of
     this restriction securities offered and sold pursuant to Rule 144A of the
     Securities Act of 1933 and Section 4(2) commercial paper) if, as a result,
     such investments would exceed 10% of the value of the net assets of the
     Fund; provided, however, that so long as a similar restriction applies
     under the Ohio Administrative Code, the Fund will invest no more than 15%
     of its total assets in the securities of issuers which together with any
     predecessors have a record of less than three years continuous operation or
     securities of issuers which are restricted as to disposition (including
     Rule 144A securities and Section 4(2) commercial paper);
         
(B)  (a) for the PIMCO Money Market, Short-Term, Low Duration, Low Duration II,
     Low Duration III, Moderate Duration, Total Return, Total Return II,
     Commercial Mortgage Securities, Long-Term U.S. Government, Municipal Bond,
     Global Bond, Foreign Bond, Strategic Balanced and StocksPLUS Short Strategy
     Funds:  purchase securities on margin, except for use of short-term credit
     necessary for clearance of purchases and sales of portfolio securities, but
     it may make margin deposits in connection with covered transactions in
     options, futures, options on futures and short positions;      

     (b) for the Global Bond Fund II, purchase securities on margin, except such
     short-term credits as may be necessary for the clearance of purchases and
     sales of securities (For this purpose, the deposit or payment by the Fund
     of initial or variation margin in connection with futures contracts or
     related options transactions is not considered the purchase of a security
     on margin.);

(C)  invest more than 5% (10% in the case of the PIMCO Low Duration Mortgage and
     Total Return Mortgage Funds) of the assets of a Fund (taken at market value
     at the time of investment) in any combination of interest only, principal
     only, or inverse floating rate securities (This restriction is not
     applicable to the Global Bond Fund II, but see fundamental investment
     restriction 7(b).);

(D)  borrow money (excluding uncovered dollar rolls, reverse repurchase
     agreements, sale-buybacks, and economically similar transactions, which are
     subject to the Fund's fundamental borrowing restriction), except for
     temporary administrative purposes (This restriction is not applicable to
     the Global Bond Fund II, but see fundamental investment restriction 7(b).);

                                       28
<PAGE>
 
(E)  for the Global Bond Fund II, make short sales of securities or maintain a
     short position for the account of the Fund unless at all times when a short
     position is open the Fund owns an equal amount of such securities or owns
     securities which, without payment of any further consideration, are
     convertible into or exchangeable for securities of the same issue as, and
     equal in amount to, the securities sold short;

(F)  for the Global Bond Fund II, purchase or sell commodities or commodity
     contracts except that the Fund may purchase and sell financial futures
     contracts and related options;

(G)  for the Global Bond Fund II, make loans, except by purchase of debt
     obligations or by entering into repurchase agreements or through the
     lending of the Fund's portfolio securities with respect to not more than
     25% of its total assets;

(H)  for the Global Bond Fund II, write (sell) or purchase options except that
     the Fund may (a) write covered call options or covered put options on
     securities that it is eligible to purchase (and on stock indices) and enter
     into closing purchase transactions with respect to such options, and (b) in
     combination therewith, or separately, purchase put and call options on
     securities it is eligible to purchase; provided that the premiums paid by
     the Fund on all outstanding options it has purchased do not exceed 5% of
     its total assets (The Fund may enter into closing sale transactions with
     respect to options it has purchased.);

     In addition, the Trust has adopted a non-fundamental policy pursuant to
which each Fund that may invest in securities denominated in foreign currencies,
except the PIMCO Global Bond, Emerging Markets Bond and Emerging Markets Bond II
Funds, will hedge at least 75% of its exposure to foreign currency using the
techniques described in the Prospectuses.  There can be no assurance that
currency hedging techniques will be successful.

     Under the 1940 Act, a "senior security" does not include any promissory
note or evidence of indebtedness where such loan is for temporary purposes only
and in an amount not exceeding 5% of the value of the total assets of the issuer
at the time the loan is made.  A loan is presumed to be for temporary purposes
if it is repaid within sixty days and is not extended or renewed.
Notwithstanding the provisions of fundamental investment restriction (7)(a)
above, a Fund may borrow money for temporary administrative purposes.  To the
extent that borrowings for temporary administrative purposes exceed 5% of the
total assets of a Fund (except the PIMCO Global Bond Fund II), such excess shall
be subject to the 300% asset coverage requirement of that restriction.
         
     To the extent a Fund covers its commitment under a reverse repurchase
agreement (or economically similar transaction) by the segregation of assets
determined to be liquid in accordance with procedures adopted by the Trustees,
equal in value to the amount of the Fund's commitment to repurchase, such an
agreement will not be considered a "senior security" by the Fund and therefore
will not be subject to the 300% asset coverage requirement otherwise applicable
to borrowings by the Fund.      

     The staff of the SEC has taken the position that purchased over-the-counter
("OTC") options and the assets used as cover for written OTC options are
illiquid securities.  Therefore, the Funds have adopted an investment policy
pursuant to which a Fund will not purchase or sell OTC options if, as a result
of such transactions, the sum of the market value of OTC options currently
outstanding which are held by the Fund, the market value of the underlying
securities covered by OTC call options currently outstanding which were sold by
the Fund and margin deposits on the Fund's existing OTC options on futures
contracts exceeds 15% of the net assets of the Fund, taken at market value,
together with all other assets of the Fund which are illiquid or are otherwise
not readily marketable.  However, if an OTC option is sold by the Fund to a
primary U.S. Government securities dealer recognized by the Federal Reserve Bank
of New York and if the Fund has the unconditional contractual right to
repurchase such OTC option from the dealer at a predetermined price, then the
Fund will treat as illiquid such amount of the underlying securities equal to
the repurchase price less the amount by which the option is "in-the-money"
(i.e., current market value of

                                       29
<PAGE>
 
the underlying securities minus the option's strike price). The repurchase price
with the primary dealers is typically a formula price which is generally based
on a multiple of the premium received for the option, plus the amount by which
the option is "in-the-money." This policy is not a fundamental policy of the
Funds and may be amended by the Trustees without the approval of shareholders.
However, the Funds will not change or modify this policy prior to the change or
modification by the SEC staff of its position.

     Unless otherwise indicated, all limitations applicable to Fund investments
(as stated above and elsewhere in this Statement of Additional Information)
apply only at the time a transaction is entered into. Any subsequent change in a
rating assigned by any rating service to a security (or, if unrated, deemed to
be of comparable quality), or change in the percentage of Fund assets invested
in certain securities or other instruments, or change in the average duration of
a Fund's investment portfolio, resulting from market fluctuations or other
changes in a Fund's total assets will not require a Fund to dispose of an
investment until the Adviser determines that it is practicable to sell or close
out the investment without undue market or tax consequences to the Fund.  In the
event that ratings services assign different ratings to the same security, the
Adviser will determine which rating it believes best reflects the security's
quality and risk at that time, which may be the higher of the several assigned
ratings.
    
Non-Fundamental Operating Policies Relating to the Sale of Shares of PIMCO Total
Return Fund in Japan      
         
     In connection with an offering of Administrative Class shares of the PIMCO
Total Return Fund in Japan, the Trust has adopted the following non-fundamental
operating policies (which may be changed without shareholder approval) with
respect to the PIMCO Total Return Fund.  These non-fundamental policies will
remain in effect only so long as (i) they are required in accordance with
standards of the Japanese Securities Dealers Association and (ii) shares of the
PIMCO Total Return Fund are being offered in Japan.      
    
(1)  The Trust will not sell shares of the PIMCO Total Return Fund in Japan
     except through PIMCO Funds Distributors LLC.      
    
(2)  The Trust will not sell shares of the PIMCO Total Return Fund in Japan with
     any special services, such as life insurance and pension, and/or any
     commodities.      
    
(3)  The Trust has appointed, and will maintain the appointment of, a bank or
     trust company as the place for safe-keeping of its assets in connection
     with the PIMCO Total Return Fund.      
    
(4)  The Tokyo District Court shall have the jurisdiction over any and all
     litigation related to transactions in any class of shares of the PIMCO
     Total Return Fund acquired by Japanese investors as required by Section
     5(2) of the Standards of Foreign Investment Fund Securities of the Japan
     Securities Dealers Association.      
    
(5)  The assets of the PIMCO Total Return Fund may not be used to underwrite
     securities issued by other persons.      
    
(6)  The PIMCO Total Return Fund may not make short sales of securities or
     maintain a short position for the account of the Fund unless at all times
     when a short position is open it owns an equal amount of such securities or
     owns securities which, without payment of any further consideration, are
     convertible into or exchangeable for securities of the same issue as, and
     equal in amount to, the securities sold short.      

                                       30
<PAGE>
     
(7)  The PIMCO Total Return Fund may not borrow money in excess of 10% of the
     value (taken at the lower of cost or current value) of its total assets
     (not including the amount borrowed) at the time the borrowing is made,
     except for extraordinary or emergency purposes, such as in the case of a
     merger, amalgamation or the like.      
    
(8)  The PIMCO Total Return Fund may not invest in voting securities of any
     issuer if, immediately after such investment, more than 10% of the total
     assets of the Fund (taken at current value) would be invested in such
     securities of such issuer.      
    
(9)  The PIMCO Total Return Fund may not acquire more than 10% of the
     outstanding voting securities of any issuer; and may not acquire more than
     15% of the outstanding voting securities of any issuer, if aggregated with
     the portion of holding in such securities by any and all other mutual funds
     managed by PIMCO.      
    
(10) The PIMCO Total Return Fund may not invest more than 10% of its total
     assets in the securities of any other investment funds or companies, except
     as they may be acquired temporarily as part of a merger, consolidation or
     acquisition of assets.      
    
(11) The PIMCO Total Return Fund may not invest more than 10% of its total
     assets in voting securities privately placed, mortgage securities or
     unlisted voting securities which cannot be readily disposed of.  This
     restriction shall not be applicable to securities determined by PIMCO to be
     liquid and for which a market price (including a dealer quotation) is
     generally obtainable or determinable.      
    
(12) The PIMCO Total Return Fund many not grant any rights or privileges to
     purchase shares of the Fund to shareholders or investors by issuing
     warrants, subscription rights or options, or other similar rights.      
    
(13) None of the portfolio securities of the PIMCO Total Return Fund may be
     purchased from or sold or loaned to any Trustee of the Trust, PIMCO, acting
     as investment adviser of the Trust, or any affiliate thereof or any of
     their directors, officers or employees, or any major shareholder thereof
     (meaning a shareholder who holds to the actual knowledge of PIMCO, on his
     own account whether in his own or other name (as well as a nominee's name),
     10% or more of the total issued outstanding shares of such a company)
     acting as principal or for their own account unless the transaction is made
     within the investment restrictions set forth in the Fund's prospectus and
     statement of additional information and either (i) at a price determined by
     current publicly available quotations (including a dealer quotation) or
     (ii) at competitive prices or interest rates prevailing from time to time
     on internationally recognized securities markets or internationally
     recognized money markets (including a dealer quotation).      
    
     All percentage limitations on investments described in the restrictions
relating to the sale of shares in Japan will apply at the time of the making of
an investment and shall not be considered violated unless an excess or
deficiency occurs or exists immediately after and as a result of such
investment.  If any violation of the foregoing investment restrictions occurs,
the Trust will, promptly after discovery of the violations, take such action as
may be necessary to cause the violation to cease, which shall be the only
obligation of the Trust and the only remedy in respect of the violation.      

                                       31
<PAGE>
 
                            MANAGEMENT OF THE TRUST

Trustees and Officers
    
     The Trustees and Executive Officers of the Trust, their business address
and principal occupations during the past five years are as follows (unless
otherwise indicated, the address of all persons below is 840 Newport Center
Drive, Suite 300, Newport Beach, California 92660):      

<TABLE>     
<CAPTION>
                                          Position with                             Principal Occupation(s)
Name, Address and Age                       the Trust                             During the Past Five Years
- ---------------------------------------------------------------------------------------------------------------------
<S>                                   <C>                              <C>
Brent R. Harris*                      Chairman of the Board and        Managing Director, PIMCO; Board of Governors,
Age 39                                Trustee                          Investment Company Institute; Director,
                                                                       Harris Holdings; Director, Harris Oil
                                                                       Company; Chairman and Director, PIMCO
                                                                       Commercial Mortgage Securities Trust, Inc.;
                                                                       Chairman and Trustee, PIMCO Variable
                                                                       Insurance Trust.
 
R. Wesley Burns*                      President and Trustee            Executive Vice President, PIMCO; President
Age 38                                                                 and Director, PIMCO Commercial Mortgage
                                                                       Securities Trust, Inc.; President and
                                                                       Trustee, PIMCO Variable Insurance Trust.
                                                                       Formerly Vice President, PIMCO.
 
Guilford C. Babcock                   Trustee                          Associate Professor of Finance, University of
1575 Circle Drive                                                      Southern California; Director, PIMCO
San Marino, California                                                 Commercial Mortgage Securities Trust, Inc.;
91108                                                                  Trustee, PIMCO Variable Insurance Trust;
Age 67                                                                 Director, Growth Fund of America and
                                                                       Fundamental Investors Fund of the Capital
                                                                       Group; Director, Good Hope Medical Foundation.
 
Vern O. Curtis                        Trustee                          Private Investor; Director, PIMCO Commercial
14158 N.W. Bronson Creek Drive                                         Mortgage Securities Trust, Inc.; Trustee,
Portland, Oregon                                                       PIMCO Variable Insurance Trust; Director,
97229                                                                  American Office Park Properties, Inc., a Real
Age 64                                                                 Estate Investment Trust; Director, Fresh
                                                                       Choice, Inc.  Formerly charitable work, The
                                                                       Church of Jesus Christ of Latter Day Saints.
 
Thomas P. Kemp                        Trustee                          Private Investor; Director, PIMCO Commercial
1141 Marine Drive                                                      Mortgage Securities Trust, Inc.; Trustee,
Laguna Beach, California                                               PIMCO Variable Insurance Trust. Formerly
92651                                                                  Co-Chairman, U.S. Committee to Assist Russian
Age 67                                                                 Reform; Director, Union Financial Corp.;
                                                                       Senior Consultant, World Cup 1994 Organizing
                                                                       Committee.
</TABLE>      
 

                                       32
<PAGE>
 
<TABLE>     
<CAPTION>
                                          Position with                             Principal Occupation(s)
Name, Address and Age                       the Trust                             During the Past Five Years
- ---------------------------------------------------------------------------------------------------------------------
<S>                                   <C>                              <C>
William J. Popejoy                    Trustee                          Director, California State Lottery; Director,
600 North 10th Street                                                  PacPro (formerly Western Printing); Director,
Sacramento, California                                                 PIMCO Commercial Mortgage Securities Trust,
95814                                                                  Inc.; Trustee, PIMCO Variable Insurance
Age 60                                                                 Trust. Formerly Chief Executive Officer,
                                                                       Orange County, California.
 
William H. Gross                      Senior Vice President            Managing Director, PIMCO; Senior Vice
Age 54                                                                 President, PIMCO Variable Insurance Trust.
 
Margaret Isberg                       Senior Vice President            Executive Vice President, PIMCO.
Age 41

Leland T. Scholey                     Senior Vice President            Senior Vice President, PIMCO.  Formerly Vice
Age 45                                                                 President, PIMCO.
 
Michael G. Dow                        Vice President                   Account Manager, PIMCO.  Formerly Fixed
Age 34                                                                 Income Specialist, Salomon Brothers, Inc.;
                                                                       Vice President Operations, Citibank NA Global
                                                                       Consumer Banking Group.
 
U. Teri Frisch                        Vice President                   Account Manager, PIMCO.
Age 45

Raymond C. Hayes                      Vice President                   Account Manager, PIMCO.  Formerly Marketing
Age 53                                                                 Director, Pacific Financial Asset Management
                                                                       Corporation.
 
Thomas J. Kelleher, III               Vice President                   Vice President, PIMCO.  Previously associated
Age 47                                                                 with Delaware, Mellon and Girard Trusts.
 
Andre Mallegol                        Vice President                   Vice President, PIMCO.  Formerly associated
Age 32                                                                 with Fidelity Investments Institutional
                                                                       Services Company.
 
Dean S. Meiling                       Vice President                   Managing Director, PIMCO.
Age 50

James F. Muzzy                        Vice President                   Managing Director, PIMCO; Senior Vice
Age 59                                                                 President, PIMCO Variable Insurance Trust.
 
Douglas J. Ongaro                     Vice President                   Account Manager, PIMCO.  Formerly Regional
Age 37                                                                 Marketing Manager, Charles Schwab & Co., Inc.
</TABLE>       

                                       33
<PAGE>
 
<TABLE>     
<CAPTION>
                                          Position with                             Principal Occupation(s)
Name, Address and Age                       the Trust                             During the Past Five Years
- ---------------------------------------------------------------------------------------------------------------------
<S>                                   <C>                              <C> 
David J. Pittman                      Vice President                   Vice President, PIMCO.  Formerly a senior
Age 50                                                                 executive with Bank of America, the Northern
                                                                       Trust Co. and NationsBank.
 
Mark A. Romano                        Vice President                   Account Manager, PIMCO.  Previously
Age 40                                                                 associated with Wells Fargo's institutional
                                                                       money management group and First Interstate's
                                                                       Pacifica family of mutual funds.
 
Jeffrey M. Sargent                    Vice President                   Vice President and Manager of Investment
Age 35                                                                 Operations Shareholder Services, PIMCO; Vice
                                                                       President, PIMCO Commercial Mortgage
                                                                       Securities Trust, Inc. and PIMCO Variable
                                                                       Insurance Trust.
 
William S. Thompson, Jr.              Vice President                   Chief Executive Officer and Managing
Age 53                                                                 Director, PIMCO; Senior Vice President, PIMCO
                                                                       Variable Insurance Trust. Formerly Managing
                                                                       Director, Salomon Brothers, Inc.
 
Kristen M. Wilsey                     Vice President                   Senior Vice President, PIMCO.  Formerly Vice
Age 38                                                                 President, Account Manager, PIMCO.
 
John P. Hardaway                      Treasurer                        Vice President and Manager of Investment
Age 41                                                                 Operations Accounting, PIMCO; Treasurer,
                                                                       PIMCO Commercial Mortgage Securities Trust,
                                                                       Inc. and PIMCO Variable Insurance Trust.
 
Garlin G. Flynn                       Secretary                        Specialist, PIMCO; Secretary, PIMCO Variable
Age 52                                                                 Insurance Trust.  Formerly Senior Fund
                                                                       Administrator, PIMCO; Senior Mutual Fund
                                                                       Analyst, PIMCO Advisors Institutional
                                                                       Services.
 
Joseph D. Hattesohl                   Assistant Treasurer              Vice President and Manager of Fund Taxation,
Age 34                                                                 PIMCO; Assistant Treasurer, PIMCO Variable
                                                                       Insurance Trust.  Formerly Director of
                                                                       Financial Reporting, Carl I. Brown & Co.; Tax
                                                                       Manager, Price Waterhouse LLP.
 
Michael J. Willemsen                  Assistant Secretary              Manager, PIMCO; Assistant Secretary, PIMCO
Age 38                                                                 Variable Insurance Trust.  Formerly Project
                                                                       Lead, PIMCO.
 
</TABLE>      
___________________
    
  *Each of Mr. Harris and Mr. Burns is an "interested person" of the Trust (as
that term is defined in the 1940 Act) because of his affiliations with PIMCO. 
     

                                       34
<PAGE>
 
Compensation Table
    
  The following table sets forth information regarding compensation received by
the Trustees for the fiscal year ended March 31, 1998.      
<TABLE>     
<CAPTION>
 
                                    Aggregate     Total Compensation from
                                   Compensation   Trust and Fund Complex
     Name and Position             from Trust/1/      Paid to Trustees/2/
     -----------------             ------------   -----------------------
     <S>                           <C>            <C>
     Guilford C. Babcock           $57,500                   $70,500
     Trustee
 
     Vern O. Curtis                $60,090                   $74,123
     Trustee
 
     Thomas P. Kemp                $57,500                   $70,500
     Trustee
 
     William J. Popejoy            $57,500                   $70,500
     Trustee
</TABLE>      
____________________
     
/1/  Each Trustee, other than those affiliated with the Adviser or its
     affiliates, receives an annual retainer of $45,000 plus $3,000 for each
     Board of Trustees meeting attended in person and $500 for each meeting
     attended telephonically, plus reimbursement of related expenses.  In
     addition, a Trustee serving as a Committee Chair, other than those
     affiliated with the Adviser or its affiliates, receives an additional
     annual retainer of $1,500. For the fiscal year ended March 31, 1998, the
     unaffiliated Trustees as a group received compensation in the amount of
     $232,590.      
    
/2/  Each Trustee also serves as a Director of PIMCO Commercial Mortgage
     Securities Trust, Inc., a registered closed-end management investment
     company, and as a Trustee of PIMCO Variable Insurance Trust, a registered
     open-end management investment company.  For their services to PIMCO
     Commerical Mortgage Securities Trust, Inc., the Directors listed above
     received an annual retainer of $6,000 plus $1,000 for each Board of
     Directors meeting attended in person and $500 for each meeting attended
     telephonically, plus reimbursement of related expenses. In addition, a
     Director serving as a Committee Chair, other than those affiliated with the
     Adviser or its affiliates, receives an additional annual retainer of $500.
     For the one year period ended March 31, 1998, the unaffiliated Directors as
     a group received compensation in the amount of $42,790.      
    
     The Trustees listed above, for their services as Trustees of PIMCO Variable
     Insurance Trust, receive an annual retainer of $4,000 plus $1,500 for each
     Board of Trustees meeting attended in person and $250 for each meeting
     attended telephonically, plus reimbursement of related expenses.  In
     addition, a Trustee serving as a Committee Chair, other than those
     affiliated with the Adviser or it affiliates, receives an additional annual
     retainer of $500.  For the one year period ended March 31, 1998, the
     unaffiliated Trustees as a group received compensation in the amount of
     $10,243.      

Investment Adviser

     PIMCO serves as investment adviser to the Funds pursuant to an investment
advisory contract ("Advisory Contract") between PIMCO and the Trust.  PIMCO is a
subsidiary partnership of PIMCO Advisors.  The general partners of PIMCO
Advisors are PIMCO Partners, G.P. and PIMCO Advisors Holdings L.P. ("PAH").
PIMCO Partners, G.P. is a general partnership between PIMCO Holding LLC, a
Delaware limited liability company and indirect wholly owned subsidiary of
Pacific Life Insurance

                                       35
<PAGE>
 
Company, and PIMCO Partners LLC, a California limited liability company
controlled by the PIMCO Managing Directors. PIMCO Partners, G.P. is the sole
general partner of PAH.

  PIMCO is responsible for making investment decisions and placing orders for
the purchase and sale of the Trust's investments directly with the issuers or
with brokers or dealers selected by it in its discretion. See "Portfolio
Transactions."  PIMCO also furnishes to the Board of Trustees, which has overall
responsibility for the business and affairs of the Trust, periodic reports on
the investment performance of each Fund.
    
  Under the terms of the Advisory Contract, PIMCO is obligated to manage the
Funds in accordance with applicable laws and regulations.  The investment
advisory services of PIMCO to the Trust are not exclusive under the terms of the
Advisory Contract.  PIMCO is free to, and does, render investment advisory
services to others.  The current Advisory Contract was approved by the Board of
Trustees, including a majority of the Trustees who are not parties to the
Advisory Contract or interested persons of such parties ("Independent
Trustees"), at a meeting held on November 22, 1994, as supplemented at meetings
held on October 1, 1995, November 21, 1995, February 27, 1996, November 19,
1996, January 14, 1997, May 27, 1997, and February 24, 1998, and was last
approved by the Trustees on August 26, 1997 and by shareholders of all then-
operational Funds on October 17, 1994.      

  The Advisory Contract will continue in effect on a yearly basis provided such
continuance is approved annually (i) by the holders of a majority of the
outstanding voting securities of the Trust or by the Board of Trustees and (ii)
by a majority of the Independent Trustees.  The Advisory Contract may be
terminated without penalty by vote of the Trustees or the shareholders of the
Trust, or by the Adviser, on 60 days' written notice by either party to the
contract and will terminate automatically if assigned.

  The Adviser currently receives a monthly investment advisory fee from each
Fund at an annual rate based on average daily net assets of the Funds as
follows:
<TABLE>      
<CAPTION> 
                                                               Advisory
Fund                                                           Fee Rate
- ----                                                           --------
<S>                                                            <C>  
Money Market Fund ............................................   0.15%
Commercial Mortgage Securities, Strategic Balanced,
 StocksPLUS, and StocksPLUS Short Strategy Funds .............   0.40%
Emerging Markets Bond and Emerging Markets Bond II Funds .....   0.45%
All other Funds ..............................................   0.25%
</TABLE>      
    
  For the fiscal years ended March 31, 1998, 1997, and 1996, the aggregate
amount of the advisory fees paid by each operational Fund was as follows:      
<TABLE>     
<CAPTION>
 
                                     Year Ended   Year Ended    Year Ended
Fund                                    3/31/98     3/31/97       3/31/96
- ----                                -----------   -----------   -----------
<S>                                 <C>           <C>           <C> 
Money Market Fund*                  $   205,384   $    67,626   $    10,118
Short-Term Fund                         487,226       311,485       249,319
Low Duration Fund                     7,416,427     6,877,132     6,267,607
Low Duration Fund II                    869,853       685,047       575,730
Low Duration Fund III                    32,700         6,114           N/A
Low Duration Mortgage Fund                5,914           N/A           N/A
Moderate Duration Fund                  294,466         6,525           N/A
Real Return Bond Fund                    18,838         2,453           N/A
Total Return Fund                    38,327,843    29,232,090    22,775,075
Total Return Fund II*                 1,145,766     1,171,011       486,935
Total Return Fund III                   701,110       423,216       327,029
</TABLE>       

                                       36
<PAGE>
 
<TABLE>      
<S>                                   <C>           <C>           <C>
Total Return Mortgage Fund                5,679           N/A           N/A
High Yield Fund                       3,670,999     1,983,580     1,186,819
Long-Term U.S. Government Fund          117,242        64,058       101,042
Global Bond Fund                        642,260       423,547       264,783
Global Bond Fund II**                    50,123        41,683           N/A
Foreign Bond Fund                       811,698       541,283       640,157
International Bond Fund               2,045,487     2,810,494     4,937,820
Emerging Markets Bond Fund               11,365           N/A           N/A
Strategic Balanced Fund                 117,547        31,660           N/A
StocksPLUS Fund                       1,919,328       779,413       324,388
- --------------------
</TABLE>      

  *The PIMCO Money Market Fund, for the fiscal year ended October 31, 1995, paid
aggregate advisory fees in the amount of $14,500.  The PIMCO Total Return Fund
II, for the fiscal year ended October 31, 1995, paid aggregate advisory fees in
the amount of $1,009,081.  See "The Reorganization of the PIMCO Money Market and
Total Return II Funds" for additional information.

  **The PIMCO Global Bond Fund II, for the fiscal year ended September 30, 1996,
paid aggregate management fees in the amount of $54,325, pursuant to a
management contract between PIMCO Advisors Funds and PIMCO Advisors, under which
PIMCO Advisors provided or procured investment advisory services for the Fund.
See "The Reorganization of the PIMCO Global Bond Fund II" for additional
information.
    
  In connection with the former expense limitation provision, which was
terminated October 1, 1995, the Adviser reimbursed advisory fees for the fiscal
years ended March 31, 1998, 1997, and 1996, in the following amounts:      

<TABLE>     
<CAPTION>
 
                                     Year Ended   Year Ended   Year Ended
Fund                                    3/31/98      3/31/97      3/31/96
- ----                                 ----------   ----------   ----------
<S>                                  <C>          <C>          <C> 
Short-Term Fund                          $0           $0         $ 10,244
Low Duration Fund II                      0            0                0
Total Return Fund III                     0            0            1,775
High Yield Fund                           0            0                0
Long-Term U.S. Government Fund            0            0           13,554
Global Bond Fund                          0            0          (17,114)
StocksPLUS Fund                           0            0           26,176 
</TABLE>      

Fund Administrator

  PIMCO also serves as Administrator to the Funds pursuant to an administration
agreement (the "Administration Agreement") with the Trust. PIMCO provides the
Funds with certain administrative and shareholder services necessary for Fund
operations and is responsible for the supervision of other Fund service
providers.  PIMCO may in turn use the facilities or assistance of its affiliates
to provide certain services under the Administration Agreement, on terms agreed
between PIMCO and such affiliates.  The administrative services provided by
PIMCO include but are not limited to: (1) shareholder servicing functions,
including preparation of shareholder reports and communications, (2) regulatory
compliance, such as reports and filings with the SEC and state securities
commissions, and (3) general supervision of the operations of the Funds,
including coordination of the services performed by the Funds' transfer agent,
custodian, legal counsel, independent accountants, and others.  PIMCO (or an
affiliate of PIMCO) also furnishes the Funds with office space facilities
required for conducting the business of the Funds, and pays the compensation of
those officers, employees and Trustees of the Trust affiliated with PIMCO.  In
addition, PIMCO, at its own expense, arranges for the provision of legal, audit,
custody, transfer agency and other services for the Funds, and is responsible
for the costs of registration of the Trust's shares and the printing of
prospectuses and shareholder reports for current shareholders. PIMCO has
contractually

                                       37
<PAGE>
 
agreed to provide these services, and to bear these expenses, at the following
rates for each Fund (each expressed as a percentage of the Fund's average daily
net assets attributable to its classes of shares on an annual basis):

<TABLE>     
<CAPTION>
 
                                                                Administrative Fee Rate
                                                                -----------------------
                                                  Institutional and       Class A,
Fund                                            Administrative Class       B and C     Class D*
- ----                                            --------------------      --------     --------    
<S>                                             <C>                       <C>          <C>
Money Market                                            0.20%               0.35%       0.45%
Short-Term Fund                                         0.20%               0.35%       0.50%
Low Duration and Total Return Funds                     0.18%               0.40%       0.50%
Moderate Duration Fund                                  0.20%               0.40%       0.65%
Municipal Bond Fund                                     0.25%               0.35%       0.60%
Global Bond and Global Bond II Funds                    0.30%               0.45%       0.70%
Foreign Bond and International Bond Funds               0.25%               0.45%       0.70%
Emerging Markets Bond and Emerging Markets
 Bond II Funds                                          0.40%               0.55%       0.80%
All other Funds                                         0.25%               0.40%       0.65%
</TABLE>      
______________________

*    As described below, the Administration Agreement includes a plan adopted
     under Rule 12b-1 which provides for the payment of up to .25% of the Class
     D Administrative Fee rate as reimbursement for expenses in respect of
     activities that may be deemed to be primarily intended to result in the
     sale of Class D shares.

     Except for the expenses paid by PIMCO, the Trust bears all costs of its
operations. The Funds are responsible for:  (i) salaries and other compensation
of any of the Trust's executive officers and employees who are not officers,
directors, stockholders, or employees of PIMCO or its subsidiaries or
affiliates; (ii) taxes and governmental fees; (iii) brokerage fees and
commissions and other portfolio transaction expenses; (iv) costs of borrowing
money, including interest expenses; (v) fees and expenses of the Trustees who
are not "interested persons" of PIMCO or the Trust, and any counsel retained
exclusively for their benefit; (vi) extraordinary expenses, including costs of
litigation and indemnification expenses; (vii) expenses, such as organizational
expenses, which are capitalized in accordance with generally accepted accounting
principles; and (viii) any expenses allocated or allocable to a specific class
of shares ("Class-specific expenses").

     Class-specific expenses include distribution and service fees payable with
respect to different classes of shares and administrative fees as described
above, and may include certain other expenses as permitted by the Trust's
Amended and Restated Multi-Class Plan adopted pursuant to Rule 18f-3 under the
1940 Act and subject to review and approval by the Trustees.

     With respect to the Institutional and Administrative Class shares of each
Fund, except the PIMCO Global Bond Fund II, the Administration Agreement may be
terminated by the Trustees, or by a vote of the outstanding voting securities of
the Trust, or Class as applicable, at any time on 60 days' written notice.
Following the expiration of the two-year period commencing with the
effectiveness of the agreement, it may be terminated by PIMCO, also on 60 days'
written notice. Following its initial two-year term, the agreement will continue
from year to year if approved by the Trustees.

     With respect to the Class A, Class B and Class C shares of the PIMCO High
Yield, Total Return, Low Duration and Money Market Funds, or with respect to any
class of shares of the PIMCO Global Bond Fund II, the Administration Agreement
may be terminated by the Trustees, or by a vote of the

                                       38
<PAGE>
 
outstanding voting securities of the Trust, Fund, or Class as applicable, at any
time on 60 days' written notice. Following the expiration of the one year period
commencing with the effectiveness of the amendment making the Administration
Agreement effective with respect to such Funds or Classes, the Agreement may be
terminated by PIMCO on 60 days' written notice. With respect to the Class A,
Class B and Class C shares of each Fund other than those listed above, the
Administration Agreement may be terminated by the Trustees, or by a vote of the
outstanding securities of the Trust, or Class as applicable, at any time on 60
days' written notice, or by PIMCO on 60 days' written notice.

  The Administration Agreement is subject to annual approval by the Board,
including a majority of the Trust's Independent Trustees (as that term is
defined in the 1940 Act).  The current Administration Agreement was approved by
the Board of Trustees, including all of the Independent Trustees at a meeting
held on February 24, 1998.  In approving the Administration Agreement, the
Trustees determined that:  (1) the Administration Agreement is in the best
interests of the Funds and their shareholders; (2) the services to be performed
under the Agreement are services required for the operation of the Funds; (3)
PIMCO is able to provide, or to procure, services for the Funds which are at
least equal in nature and quality to services that could be provided by others;
and (4) the fees to be charged pursuant to the Agreement are fair and reasonable
in light of the usual and customary charges made by others for services of the
same nature and quality.

  Under the Administration Agreement, the Administrator or an affiliate may pay
financial service firms a portion of the Class D administration fees in return
for the firms' services (normally not to exceed an annual rate of .35% of a
Fund's average daily net assets attributable to Class D shares purchase through
such firms).  The Administration Agreement includes a plan specific to Class D
shares that has been adopted in conformity with the requirements set forth under
Rule 12b-1 of the 1940 Act to allow for payment of up to .25% per annum of the
Class D administrative fees as reimbursement for expenses in respect of
activities that may be deemed to be primarily intended to result in the sale of
Class D shares.  The principal types of activities for which such payments may
be made are services in connection with the distribution and marketing of Class
D shares and/or the provision of shareholder services.  See "Distribution of
Trust Shares - Plan for Class D Shares."
    
  For the fiscal years ended March 31, 1998, 1997, and 1996, the aggregate
amount of the administration fees paid by each operational Fund was as follows
(Class D shares were not offered during the periods listed):      

                                       39
<PAGE>
 
<TABLE>     
<CAPTION>
 
                                      Year Ended    Year Ended    Year Ended
Fund                                    3/31/98       3/31/97       3/31/96
- ----                                -----------   -----------   -----------
<S>                                 <C>           <C>           <C> 
Money Market Fund*                  $   423,936   $   117,570   $    13,462
Short-Term Fund                         410,894       249,655       137,477
Low Duration Fund                     5,665,996     5,005,045     3,520,078
Low Duration Fund II                    869,853       685,047       391,248
Low Duration Fund III                    32,700         6,114           N/A
Low Duration Mortgage Fund                5,914           N/A           N/A
Moderate Duration Fund                  235,572         5,220           N/A
Real Return Bond Fund                    21,841         2,503           N/A
Total Return Fund                    29,219,721    21,266,359    13,084,413
Total Return Fund II*                 1,145,766     1,171,011       486,935
Total Return Fund III                   701,110       423,216       217,584
Total Return Mortgage Fund                5,679           N/A           N/A
High Yield Fund                       4,258,485     2,071,177       842,032
Long-Term U.S. Government Fund          130,444        64,374        65,155
Global Bond Fund                        770,719       508,256       208,234
Global Bond Fund II**                    87,617        14,646           N/A
Foreign Bond Fund                       849,691       540,519       428,175
International Bond Fund               2,045,487     2,810,494     3,800,674
Emerging Markets Bond Fund               10,526           N/A           N/A
Strategic Balanced Fund                  73,467        19,788           N/A
StocksPLUS Fund                       1,392,509       491,519       149,888
- --------------------
</TABLE>      

  *The PIMCO Money Market Fund, for the fiscal year ended October 31, 1995, paid
aggregate administration fees in the amount of $24,166.  The PIMCO Total Return
Fund II, for the fiscal year ended October 31, 1995, paid aggregate
administration fees in the amount of $1,009,081.  See "The Reorganization of the
PIMCO Money Market and Total Return II Funds" for additional information.

  **The PIMCO Global Bond Fund II, for the fiscal year ended September 30, 1996,
paid aggregate management fees in the amount of $54,325, pursuant to a
management contract between PIMCO Advisors Funds and PIMCO Advisors, under which
PIMCO Advisors provided or procured administrative services for the Fund.  See
"The Reorganization of the PIMCO Global Bond Fund II" for additional
information.
    
  In connection with the former expense limitation provision which was
terminated October 1, 1995, the Administrator reimbursed administration fees for
the fiscal years ended March 31, 1998, 1997, and 1996, in the following amounts:
     
<TABLE>     
<CAPTION>
 
                                     Year Ended    Year Ended   Year Ended
Fund                                   3/31/98      3/31/97       3/31/96
- ----                                 ----------    ----------   -----------
<S>                                  <C>           <C>          <C> 
Short-Term Fund                         $0           $0          $ 2,923
Low Duration Fund II                     0            0                0
Total Return Fund III                    0            0              507
High Yield Fund                          0            0                0
Long-Term U.S. Government Fund           0            0            3,867
Global Bond Fund                         0            0           (4,884)
StocksPLUS Fund                          0            0            7,469
 
</TABLE>      

                                       40
<PAGE>
 
                          DISTRIBUTION OF TRUST SHARES

Distributor and Multi-Class Plan

  PIMCO Funds Distributors LLC (the "Distributor") serves as the distributor of
each class of the Trust's shares pursuant to a distribution contract
("Distribution Contract") with the Trust which is subject to annual approval by
the Board.  The Distributor is a wholly owned subsidiary of PIMCO Advisors. The
Distribution Contract is terminable with respect to a Fund or class without
penalty, at any time, by the Fund or class by not more than 60 days' nor less
than 30 days' written notice to the Distributor, or by the Distributor upon not
more than 60 days' nor less than 30 days' written notice to the Trust.  The
Distributor is not obligated to sell any specific amount of Trust shares.

  The Distribution Contract will continue in effect with respect to each Fund
and each class of shares thereof for successive one-year periods, provided that
each such continuance is specifically approved (i) by the vote of a majority of
the Trustees who are not interested persons of the Trust (as defined in the 1940
Act) and who have no direct or indirect financial interest in the Distribution
Contract, the Administration Agreement or the Distribution and/or Servicing
Plans described below; and (ii) by the vote of a majority of the entire Board of
Trustees cast in person at a meeting called for that purpose.  If the
Distribution Contract is terminated (or not renewed) with respect to one or more
Funds or classes thereof, it may continue in effect with respect to any class of
any Fund as to which it has not been terminated (or has been renewed).

  The Trust offers six classes of shares: Class A, Class B, Class C, Class D,
the Institutional Class and the Administrative Class.

  Class A, Class B and Class C shares of the Trust are offered through firms
("participating brokers") which are members of the National Association of
Securities Dealers, Inc. ("NASD"), and which have dealer agreements with the
Distributor, or which have agreed to act as introducing brokers for the
Distributor ("introducing brokers").

  Class D shares are generally offered to clients of financial service firms,
such as broker-dealers or registered investment advisors, with which the
Distributor has an agreement for the use of PIMCO Funds: Pacific Investment
Management Series in particular investment products, programs or accounts for
which a fee may be charged.

  Shares of the Institutional Class are offered primarily for direct investment
by investors such as pension and profit sharing plans, employee benefit trusts,
endowments, foundations, corporations and high net individuals.  (Institutional
Class shares may also be offered through certain financial intermediaries that
charge their customers transaction or other fees with respect to the customer's
investment in the Funds.  Shares of the Administrative Class are offered
primarily through employee benefit plans alliances, broker-dealers, and other
intermediaries, and each Fund pays service or distribution fees to such entities
for services they provide to shareholders of that class.)

  The Trust has adopted an Amended and Restated Multi-Class Plan ("Multi-Class
Plan") pursuant to Rule 18f-3 under the 1940 Act.  Under the Multi-Class Plan,
shares of each class of each Fund represent an equal pro rata interest in such
Fund and, generally, have identical voting, dividend, liquidation, and other
rights, preferences, powers, restrictions, limitations, qualifications and terms
and conditions, except that: (a) each class has a different designation; (b)
each class of shares bears any class-specific expenses allocated to it; and (c)
each class has exclusive voting rights on any matter submitted to shareholders
that relates solely to its distribution or service arrangements, and each class
has separate voting rights on any matter submitted to shareholders in which the
interests of one class differ from the interests of any other class.  In
addition, each class may have a differing sales charge structure, and differing
exchange and conversion features.

                                       41
<PAGE>
 
Contingent Deferred Sales Charge and Initial Sales Charge

  As described in the Class A, B and C Prospectus under the caption "How to
Redeem," a contingent deferred sales charge is imposed upon certain redemptions
of the Class A, Class B and Class C shares. No contingent deferred sales charge
is currently imposed upon redemptions of Class D, Institutional Class or
Administrative Class shares.  Because contingent deferred sales charges are
calculated on a Fund-by-Fund basis, shareholders should consider whether to
exchange shares of one Fund for shares of another Fund prior to redeeming an
investment if such an exchange would reduce the contingent deferred sales charge
applicable to such redemptions.
    
  For the fiscal year ended March 31, 1998, the Distributor received an
aggregate of $37,724, $694,715 and $246,969 in contingent deferred sales charges
on redemptions of Class A, Class B and Class C shares, respectively, of which
the indicated amounts were attributable to the following Funds:      

<TABLE>     
<CAPTION>
 
Fund                                Class A   Class B    Class C
- ----                                -------   --------   --------
<S>                                 <C>       <C>        <C>
Money Market Fund                   $     0   $ 40,647    $26,492
Short-Term Fund                           0        169      6,736
Low Duration Fund                         0     36,762     57,646
Real Return Bond Fund                     0     18,727      5,794
Total Return Fund                         0    282,902     79,413
High Yield Fund                      37,709    194,703     40,002
Long-Term U.S. Government Fund            0     13,060      6,293
Global Bond Fund II                       0     19,818      1,155
Foreign Bond Fund                         0      9,331      5,008
Emerging Markets Bond Fund                0          0         83
StocksPLUS Fund                          15     78,598     18,347
</TABLE>      
    
  For the fiscal year ended March 31, 1997, the Distributor received an
aggregate of $670, $85,380 and $44,409 in contingent deferred sales charges on
redemptions of Class A, Class B and Class C shares, respectively, of which the
indicated amounts were attributable to  the following Funds:      
<TABLE>     
<CAPTION>
 
Fund                                Class A   Class B    Class C
- ----                                -------   --------   --------
<S>                                 <C>       <C>        <C>   
Money Market Fund                      $  0    $ 3,242    $ 8,900
Low Duration Fund                         0     14,025      5,158
Total Return Fund                       670     36,901     24,796
High Yield Fund                           0     14,746      5,318
Global Bond Fund II                       0        429        160
StocksPLUS Fund                           0     16,037         77
</TABLE>      

  For the fiscal year ended September 30, 1996, the Distributor received $0,
$1,946 and $2,704 in contingent deferred sales charges on Class A, Class B and
Class C shares, respectively, of the Global Bond Fund II while the Fund was a
series of PIMCO Advisors Funds ("PAF").  See "The Reorganization of the PIMCO
Global Bond Fund II."

  In certain cases described in the Class A, B and C Prospectus, the contingent
deferred sales charge is waived on redemptions of Class A, Class B or Class C
shares for certain classes of individuals or entities on account of (i) the fact
that the Trust's sales-related expenses are lower for certain of such classes
than for classes for which the contingent deferred sales charge is not waived,
(ii) waiver of the contingent deferred sales charge with respect to certain of
such classes is consistent with certain Internal Revenue Code policies
concerning the favored tax treatment of accumulations, and (iii) with respect to
certain of such classes, considerations of fairness, and competitive and
administrative factors.

                                       42
<PAGE>
     
  As described in the Class A, B and C Prospectus under the caption "Alternative
Purchase Arrangements -- Class A," Class A shares of the Trust (except with
respect to the Money Market Fund) are sold pursuant to an initial sales charge,
which declines as the amount of purchase reaches certain defined levels. For the
fiscal year ended March 31, 1998, the Distributor received an aggregate of
$2,598,104, and retained $186,443, in initial sales charges on Class A shares,
of which the indicated amounts were attributable to the following Funds:      

<TABLE>     
<CAPTION>
 
                                                    Amount Retained
Fund                                Sales Charges   by Distributor
- ----                                -------------   ---------------
<S>                                 <C>             <C>
Short-Term Fund                        $   78,431           $15,135
Low Duration Fund                         193,801             4,602
Real Return Bond Fund                      13,038             1,079
Total Return Fund                       1,148,499            58,939
High Yield Fund                           589,516            38,387
Long-Term U.S. Government Fund             69,745             9,017
Global Bond Fund II                        21,646             1,162
Foreign Bond Fund                          89,074            14,968
Emerging Markets Bond Fund                  1,475               176
StocksPLUS Fund                           392,878            42,978
</TABLE>      
    
  For the fiscal year ended March 31, 1997, the Distributor received an
aggregate of $389,133, and retained $45,871, in initial sales charges on Class A
shares, of which the indicated amounts were attributable to the following Funds:
     
<TABLE>
<CAPTION>
 
                                                    Amount Retained
Fund                                Sales Charges   by Distributor
- ----                                -------------   ---------------
<S>                                 <C>             <C>
 
Short-Term Fund                          $ 12,016           $ 2,622
Low Duration Fund                          24,796             3,653
High Yield Fund                            66,992             9,075
Total Return Fund                         174,602            13,299
Long-Term U.S. Government Fund              9,494             1,284
Foreign Bond Fund                          16,091             1,913
Global Bond Fund II                        11,774             1,520
StocksPLUS Fund                            73,368            12,505
</TABLE>

     For the fiscal year ended September 30, 1996, the Distributor received
$48,106, and retained $9,896, in initial sales charges paid by shareholders of
the Class A shares of the Global Bond Fund II while the Fund was a series of
PAF.

Distribution and Servicing Plans for Class A, Class B and Class C Shares

  As stated in the text of the Class A, B and C Prospectus under the caption
"Distributor and Distribution and Servicing Plans," Class A, Class B and Class C
shares of the Trust are continuously offered through participating brokers which
are members of the NASD and which have dealer agreements with the Distributor,
or which have agreed to act as introducing brokers.

  Pursuant to separate Distribution and Servicing Plans for Class A, Class B and
Class C shares (the "Retail Plans"), as described in the Class A, B and C
Prospectus, in connection with the distribution of Class B and Class C shares of
the Trust, the Distributor receives certain distribution fees from the Trust,
and in connection with personal services rendered to Class A, Class B and Class
C shareholders of the Trust and the maintenance of shareholder accounts, the
Distributor receives certain servicing fees from the Trust. Subject to the
percentage limitations on these distribution and servicing fees set forth in the
Class A,

                                       43
<PAGE>
 
B and C Prospectus, the distribution and servicing fees may be paid with respect
to services rendered and expenses borne in the past with respect to Class A,
Class B and Class C shares as to which no distribution and servicing fees were
paid on account of such limitations. As described in the Class A, B and C
Prospectus, the Distributor pays (i) all or a portion of the distribution fees
it receives from the Trust to participating and introducing brokers, and (ii)
all or a portion of the servicing fees it receives from the Trust to
participating and introducing brokers, certain banks and other financial
intermediaries.
    
  Each Retail Plan may be terminated with respect to any Fund to which the Plan
relates by vote of a majority of the Trustees who are not interested persons of
the Trust (as defined in the 1940 Act) and who have no direct or indirect
financial interest in the operation of the Plan or the Distribution Contract
("Disinterested Trustees") or by vote of a majority of the outstanding voting
securities of the relevant class of that Fund. Any change in any Retail Plan
that would materially increase the cost to the class of shares of any Fund to
which the Plan relates requires approval by the affected class of shareholders
of that Fund. The Trustees review quarterly written reports of such costs and
the purposes for which such costs have been incurred.  Each Retail Plan may be
amended by vote of the Disinterested Trustees cast in person at a meeting called
for the purpose. As long as the Retail Plans are in effect, selection and
nomination of those Trustees who are not interested persons of the Trust shall
be committed to the discretion of such Disinterested Trustees.      
    
  The Retail Plans will continue in effect with respect to each Fund and each
class of shares thereof for successive one-year periods, provided that each such
continuance is specifically approved (i) by the vote of a majority of the
Disinterested Trustees and (ii) by the vote of a majority of the entire Board of
Trustees cast in person at a meeting called for that purpose.      
    
  The Retail Plans went into effect for the Funds in January 1997.  If a Retail
Plan is terminated (or not renewed) with respect to one or more Funds, it may
continue in effect with respect to any class of any Fund as to which it has not
been terminated (or has been renewed).      
    
  The Trustees believe that the Retail Plans will provide benefits to the
Trust. The Trustees believe that the Retail Plans will result in greater sales
and/or fewer redemptions of Trust shares, although it is impossible to know for
certain the level of sales and redemptions of Trust shares that would occur in
the absence of the Retail Plans or under alternative distribution schemes.
Although the Funds' expenses are essentially fixed, the Trustees believe that
the effect of the Retail Plans on sales and/or redemptions may benefit the Trust
by reducing Fund expense ratios and/or by affording greater flexibility to
Portfolio Managers.  From time to time, expenses of the Distributor incurred in
connection with the sale of Class B and Class C shares of the Funds, and in
connection with the servicing of Class B and Class C shareholders of the Funds
and the maintenance of shareholder accounts, may exceed the distribution and
servicing fees collected by the Distributor.  The Trustees consider such
unreimbursed amounts, among other factors, in determining whether to cause the
Funds to continue payments of distribution and servicing fees in the future with
respect to Class B and Class C shares.      
    
  From time to time, expenses of principal underwriters incurred in connection
with the sale of shares of the Funds and in connection with the servicing of
shareholders of the Funds and the maintenance of shareholder accounts may exceed
the distribution and servicing fees collected by the Distributor.  As of March
31, 1998, such expenses were approximately $2,927,000 in excess of payments
under the Funds' Class A Distribution and Servicing Plan, $12,538,000 in excess
of payments under the Funds' Class B Distribution and Servicing Plan, and
$222,000 in excess of payments under the Funds' Class C Distribution and
Servicing Plan.  The surplus or deficit of payments relative to expenses under
the Retail Plans for this period was as follows for the indicated Funds:      

                                       44
<PAGE>
 
<TABLE>     
<CAPTION>

Fund                                                  Class A                   Class B                   Class C
- ----                                                  -------                   -------                   -------            
<S>                                                 <C>                       <C>                        <C>
Money Market Fund                                   $  (199,000)              $    63,000                $ (87,000)
Short-Term Fund                                         (69,000)                   (1,000)                 (33,000)
Low Duration Fund                                      (459,000)                 (606,000)                (129,000)
Real Return Fund                                         (2,000)                  (65,000)                  (1,000)
Total Return Fund                                    (1,890,000)               (4,258,000)                 336,000
High Yield Fund                                        (195,000)               (3,932,000)                 118,000
Long-Term U.S. Government Fund                            7,000                  (292,000)                 (50,000)
Global Bond Fund II                                     (36,000)                  (18,000)                  (3,000)
Foreign Bond Fund                                        (9,000)                 (368,000)                (101,000)
Emerging Markets Bond Fund                                    0                    (9,000)                  (2,000)
StocksPLUS Fund                                         (75,000)               (3,052,000)                (270,000)
</TABLE>      
    
  For the fiscal year ended March 31, 1998, the Trust paid the Distributor an
aggregate of $1,180,030, $2,879,743 and $6,380,736 pursuant to the Distribution
and Servicing Plans for Class A, Class B and Class C shares, respectively, of
which the indicated amounts were attributable to the following Funds:      

<TABLE>     
<CAPTION>
Fund                                                  Class A                   Class B                   Class C
- ----                                                  -------                   -------                   -------            
<S>                                                   <C>                      <C>                      <C>
Money Market Fund                                      $ 38,216                $   27,747               $   59,070
Short-Term Fund                                          23,033                     7,508                   22,612
Low Duration Fund                                       192,859                    95,153                  461,997
Real Return Fund                                          1,143                     5,280                    4,292
Total Return Fund                                       679,157                 1,153,121                3,510,589
High Yield Fund                                         121,858                 1,013,423                1,812,394
Long-Term U.S. Government Fund                            8,199                    28,337                   26,880
Global Bond Fund II                                      20,868                    42,965                   14,300
Foreign Bond Fund                                        10,245                    58,084                   91,131
Emerging Markets Bond Fund                                  316                       928                      635
StocksPLUS Fund                                          84,136                   447,197                  376,836
</TABLE>      
    
  During the fiscal year ended March 31, 1998, the amounts collected pursuant to
the Distribution and Servicing Plan for Class A shares and the front-end sales
charge imposed on Class A shares were used as follows: (A) sales commissions and
other compensation to sales personnel, $2,833,600; (B) preparing, printing and
distributing sales material and advertising (including preparing, printing and
distributing prospectuses to non-shareholders), and other expenses (including
data processing, legal and operations), $944,533.  The total, if allocated among
the Funds based upon the relative net assets attributed to their Class A shares
on March 31, 1998, would have been as follows:      

                                       45
<PAGE>
 
<TABLE>     
<CAPTION>
 
Fund                                    A           B
- ----                                ----------   --------
<S>                                 <C>          <C>
Money Market Fund                   $  135,446   $ 45,149
Short-Term Fund                         79,057     26,352
Low Duration Fund                      358,450    119,483
Real Return Bond Fund                    1,133        378
Total Return Fund                    1,746,631    582,210
High Yield Fund                        231,788     77,263
Long-Term U.S. Government Fund          20,119      6,706
Global Bond Fund II                     22,385      7,462
Foreign Bond Fund                       31,453     10,484
Emerging Markets Bond Fund               1,133        378
StocksPLUS Fund                        206,003     68,668
</TABLE>      
    
  During the fiscal year ended March 31, 1998, the amounts collected pursuant to
the Distribution and Servicing Plan for Class B shares and the contingent
deferred sales charge imposed on Class B shares were used as follows:  (A) sales
commissions and other compensation to sales personnel, $2,680,845; (B)
preparing, printing and distributing sales material and advertising (including
preparing, printing and distributing prospectuses to non-shareholders), and
other expenses (including data processing, legal and operations), $893,615. The
total, if allocated among the Funds based upon the relative net assets
attributed to their Class B shares on March 31, 1998, would have been as
follows:      
<TABLE>     
<CAPTION>
 
Fund                                    A           B
- ----                                ----------   --------
<S>                                 <C>          <C>
Money Market Fund                   $   16,085   $  5,362
Short-Term Fund                          6,970      2,323
Low Duration Fund                       96,779     32,260
Real Return Bond Fund                    8,311      2,770
Total Return Fund                    1,025,959    341,986
High Yield Fund                        857,066    285,689
Long-Term U.S. Government Fund          41,285     13,762
Global Bond Fund II                     24,664      8,221
Foreign Bond Fund                       58,442     19,481
Emerging Markets Bond Fund               1,609        536
StocksPLUS Fund                        543,675    181,225
</TABLE>      
    
  During the fiscal year ended March 31, 1998, the amounts collected pursuant to
the Distribution and Servicing Plan for Class C shares and the contingent
deferred sales charge imposed on Class C shares were used as follows:  (A) sales
commissions and other compensation to sales personnel, $4,970,779; (B)
preparing, printing and distributing sales material and advertising (including
preparing, printing and distributing prospectuses to non-shareholders), and
other expenses (including data processing, legal and operations), $1,656,926.
The total, if allocated among the Funds based upon the relative net assets
attributed to their Class C shares on March 31, 1998, would have been as
follows:      

                                       46
<PAGE>
 
<TABLE>     
<CAPTION>
 
Fund                                    A           B
- ----                                ----------   --------
<S>                                 <C>          <C>
 
Money Market Fund                   $  291,785   $ 97,262
Short-Term Fund                         35,293     11,764
Low Duration Fund                      360,381    120,127
Real Return Bond Fund                    2,485        828
Total Return Fund                    2,121,528    707,176
High Yield Fund                      1,491,731    497,244
Long-Term U.S. Government Fund          37,778     12,593
Global Bond Fund II                     31,813     10,604
Foreign Bond Fund                       89,474     29,825
Emerging Markets Bond Fund                 497        166
StocksPLUS Fund                        508,014    169,338
</TABLE>      

Distribution and Administrative Services Plans for Administrative Class Shares

     The Trust has adopted an Administrative Services Plan and a Distribution
Plan (together, the "Administrative Plans") with respect to the Administrative
Class shares of each Fund.  Under the terms of each Administrative Plan, the
Trust is permitted to reimburse, out of the assets attributable to the
Administrative Class shares of each Fund, in an amount up to 0.25% on an annual
basis of the average daily net assets of that class, financial intermediaries
that provide services in connection with the distribution of Administrative
Class shares or administration of plans or programs that use Administrative
Class of the Funds shares as their funding medium, and to reimburse certain
other distribution related expenses.  Under the terms of the Administrative
Class Distribution Plan, these services may include, but are not limited to, the
following functions: providing facilities to answer questions from prospective
investors about a Fund; receiving and answering correspondence, including
requests for prospectuses and statements of additional information; preparing,
printing and delivering prospectuses and shareholder reports to prospective
shareholders; complying with federal and state securities laws pertaining to the
sale of Administrative Class shares; and assisting investors in completing
application forms and selecting dividend and other account options.

     Under the terms of the Administrative Services Plan, the services may
include, but are not limited to, the following functions:  receiving,
aggregating and processing shareholder orders; furnishing shareholder sub-
accounting; providing and maintaining elective shareholder services such as
check writing and wire transfer services; providing and maintaining pre-
authorized investment plans; communicating periodically with shareholders;
acting as the sole shareholder of record and nominee for shareholders;
maintaining accounting records for shareholders; answering questions and
handling correspondence from shareholders about their accounts; and performing
similar account administrative services.

     The same entity may be the recipient of fees under both the Administrative
Class Distribution Plan and the Administrative Services Plan, but may not
receive fees under both plans with respect to the same assets.

     Each Administrative Plan provides that it may not be amended to materially
increase the costs which Administrative Class shareholders may bear under the
Plan without the approval of a majority of the outstanding voting securities of
the Administrative Class, and by vote of a majority of both (i) the Trustees of
the Trust and (ii) those Trustees who are not "interested persons" of the Trust
(as defined in the 1940 Act) and who have no direct or indirect financial
interest in the operation of the Plan or any agreements related to it (the "Plan
Trustees"), cast in person at a meeting called for the purpose of voting on the
Plan and any related amendments.

     Each Administrative Plan provides that it may not take effect until
approved by vote of a majority of both (i) the Trustees of the Trust and (ii)
the disinterested Trustees defined above.  The Administrative Class Distribution
Plan further provides that it may not take effect unless approved by the vote of
a

                                       47
<PAGE>
 
majority of the outstanding voting securities of the Administrative Class. The
Administrative Plans were approved by the Trustees, including the disinterested
Trustees, at a meeting held on August 27, 1996.

     Each Administrative Plan provides that it shall continue in effect so long
as such continuance is specifically approved at least annually by the Trustees
and the disinterested Trustees defined above.  Each Administrative Plan provides
that any person authorized to direct the disposition of monies paid or payable
by a class pursuant to the Plan or any related agreement shall provide to the
Trustees, and the Board shall review at least quarterly, a written report of the
amounts so expended and the purposes for which such expenditures were made.

     Each Administrative Plan provides that expenses payable under the Plan may
be carried forward for reimbursement for up to twelve months beyond the date in
which the expense is incurred, subject to the limit that not more that 0.25% of
the average daily net assets of Administrative Class shares may be used in any
month to pay expenses under the Plan.  Each Plan requires that Administrative
Class shares incur no interest or carrying charges.

     Rules of the NASD limit the amount of distribution fees that may be paid by
mutual funds. "Service fees," defined to mean fees paid for providing
shareholder services or the maintenance of accounts (but not transfer agency
services) are not subject to the limits.  The Trust believes that most, if not
all, of the fees paid pursuant to both Administrative Plans will qualify as
"service fees" and therefore will not be limited by NASD rules.
    
     For the fiscal year ended March 31, 1998, the Administrative Class shares
of the Funds paid aggregate fees under the Administrative Plans to qualified
service providers in the following amounts. All of these amounts constituted
"service fees" under applicable NASD rules.      

<TABLE>     
<CAPTION>  
     Fund                                    Fees
     ----                                    ----
     <S>                                 <C> 
     Money Market Fund                   $    714
     Short-Term Fund                       10,358
     Low Duration Fund                     71,094
     Real Return Bond Fund                686,365
     Total Return Fund                     22,821
     High Yield Fund                          320
     Long-Term U.S. Government Fund        60,910
     Global Bond Fund II                    5,379
     Foreign Bond Fund                      8,952
     Emerging Markets Bond Fund               535
     StocksPLUS Fund                        2,998
</TABLE>      

Plan for Class D Shares

     As described under "Management of the Trust- Fund Administrator," the
Funds' Administration Agreement includes a plan (the "Class D Plan") adopted
pursuant to Rule 12b-1 under the 1940 Act which provides for the payment of up
to .25% of the Class D administrative fees as reimbursement for expenses in
respect of activities that may be deemed to be primarily intended to result in
the sale of Class D shares.

     Specifically, the Administration Agreement provides that the Administrator
shall provide in respect of Class D shares (either directly or by procuring
through other entities, including various financial services firms such as
broker-dealers and registered investment advisors ("Service Organizations"))
some or all of the following services and facilities in connection with direct
purchases by shareholders or in connection with products, programs or accounts
offered by such Service Organizations ("Special Class D Services"): (i)
facilities for placing orders directly for the purchase of a Fund's shares and
tendering a Fund's Class D shares for redemption; (ii) advertising with respect
to a Fund's Class D shares; (iii) providing information

                                       48
<PAGE>
 
about the Funds; (iv) providing facilities to answer questions from prospective
investors about the Funds; (v) receiving and answering correspondence, including
requests for prospectuses and statements of additional information; (vi)
preparing, printing and delivering prospectuses and shareholder reports to
prospective shareholders; (vii) assisting investors in applying to purchase
Class D shares and selecting dividend and other account options; and (viii)
shareholder services provided by a Service Organization that may include, but
are not limited to, the following functions: receiving, aggregating and
processing shareholder orders; furnishing shareholder sub-accounting; providing
and maintaining elective shareholder services such as check writing and wire
transfer services; providing and maintaining pre-authorized investment plans;
communicating periodically with shareholders; acting as the sole shareholder of
record and nominee for shareholders; maintaining accounting records for
shareholders; answering questions and handling correspondence from shareholders
about their accounts; issuing confirmations for transactions by shareholders;
performing similar account administrative services; providing such shareholder
communications and recordkeeping services as may be required for any program for
which the Service Organization is a sponsor that relies on Rule 3a-4 under the
1940 Act; and providing such other similar services as may reasonably be
requested to the extent the Service Organization is permitted to do so under
applicable statutes, rules, or regulations.

     The Administrator has entered into an agreement with the Distributor under
which the distributor is compensated for providing or procuring certain of the
Class D Services at the rate of .25% per annum of all assets attributable to
Class D shares sold through the Distributor.

     The Trust and the Administrator understand that some or all of the Special
Class D Services pursuant to the Administration Agreement may be deemed to
represent services primarily intended to result in the sale of Class D shares.
The Administration Agreement includes the Class D Plan to account for this
possibility.  The Administration Agreement provides that any portion of the fees
paid thereunder in respect of Class D shares representing reimbursement for the
Administrator's and the Distributor's expenditures and internally allocated
expenses in respect of Class D Services of any Fund shall not exceed the rate of
 .25% per annum of the average daily net assets of such Fund attributable to
Class D shares.

     In accordance with Rule 12b-1 under the 1940 Act, the Class D Plan may not
be amended to increase materially the costs which Class D shareholders may bear
under the Plan without approval of a majority of the outstanding Class D shares,
and by vote of a majority of both (i) the Trustees of the Trust and (ii) those
Trustees ("disinterested Class D Plan Trustees") who are not "interested
persons" of the Trust (as defined in the 1940 Act) and who have no direct or
indirect financial interest in the operation of the Plan or any agreements
related to it, cast in person at a meeting called for the purpose of voting on
the Plan and any related amendments.  The Class D Plan may not take effect until
approved by a vote of a majority of both (i) the Trustees of the Trust and (ii)
the disinterested Class D Plan Trustees.  In addition, the Class D Plan may not
take effect unless it is approved by the vote of a majority of the outstanding
Class D shares and it shall continue in effect so long as such continuance is
specifically approved at least annually by the Trustees and the disinterested
Class D Plan Trustees.

     With respect to the Class D Plan, the Administration Agreement requires the
Administrator to present reports as to out-of-pocket expenditures and internal
expenses allocations of the Administrator and the Distributor at least quarterly
and in a manner that permits the disinterested Class D Plan Trustees to
determine that portion of the Class D administrative fees paid thereunder which
represents reimbursements in respect of Special Class D Services.

     Rules of the NASD limit the amount of distribution fees that may be paid by
mutual funds.  "Service fees," defined to mean fees paid for providing
shareholder services or the maintenance of accounts (but not transfer agency
services) are not subject to the limits.  The Trust believes that most, if not
all, of the fees paid pursuant to the Class D Plan will qualify as "service
fees" and therefore will not be limited by NASD rules.

                                       49
<PAGE>
 
Purchases, Exchanges and Redemptions

     Purchases, exchanges and redemptions of Class A, Class B, Class C and Class
D shares are discussed in the Class A, B and C and Class D Prospectuses under
the headings "How to Buy Shares," "Exchange Privilege," and "How to Redeem," and
that information is incorporated herein by reference.  Purchases, exchanges and
redemptions of Institutional and Administrative Class shares are discussed in
the Institutional Prospectus under the headings "Purchase of Shares,"
"Redemption of Shares," and "Net Asset Value," and that information is
incorporated herein by reference.

     Certain managed account clients of the Adviser may purchase shares of the
Trust.  To avoid the imposition of duplicative fees, the Adviser may be required
to make adjustments in the management fees charged separately by the Adviser to
these clients to offset the generally higher level of management fees and
expenses resulting from a client's investment in the Trust.

     Certain clients of the Adviser whose assets would be eligible for purchase
by one or more of the Funds may purchase shares of the Trust with such assets.
Assets so purchased by a Fund will be valued in accordance with procedures
adopted by the Board of Trustees.

     Certain shares of the Funds are not qualified or registered for sale in all
states.  Prospective investors should inquire as to whether shares of a
particular Fund or class are available for offer and sale in their state of
domicile or residence.  Shares of a Fund may not be offered or sold in any state
unless registered or qualified in that jurisdiction, unless an exemption from
registration or qualification is available.

     Independent financial intermediaries unaffiliated with PIMCO may perform
shareholder servicing functions with respect to certain of their clients whose
assets may be invested in the Funds. These services, normally provided by PIMCO
directly to Trust shareholders, may include the provision of ongoing information
concerning the Funds and their investment performance, responding to shareholder
inquiries, assisting with purchases, redemptions and exchanges of Trust shares,
and other services. PIMCO may pay fees to such entities for the provision of
these services which PIMCO normally would perform, out of PIMCO's own resources.

     As described in the Class A, B and C and Class D Prospectuses under the
caption "Exchange Privilege," and in the Institutional Prospectus under the
caption "Redemption of Shares," a shareholder may exchange shares of any Fund
for shares of any other Fund of the Trust (except the PIMCO International Fund
and the PIMCO Emerging Markets Bond Fund II, each of which is only available to
private account clients of PIMCO) or any  series of PIMCO Funds:  Multi-Manager
Series, within the same class on the basis of their respective net asset values.
The original purchase date(s) of shares exchanged for purposes of calculating
any contingent deferred sales charge will carry over to the investment in the
new Fund. For example, if a shareholder invests in the Class C shares of one
Fund and 6 months later (when the contingent deferred sales charge upon
redemption would normally be 1%) exchanges his shares for Class C shares of
another Fund, no sales charge would be imposed upon the exchange but the
investment in the other Fund would be subject to the 1% contingent deferred
sales charge until one year after the date of the shareholder's investment in
the first Fund as described in the Class A, B and C Prospectus under
"Alternative Purchase Arrangements." With respect to Class B or Class C shares,
or Class A shares subject to a contingent deferred sales charge, if less than
all of an investment is exchanged out of a Fund, any portion of the investment
attributable to capital appreciation and/or reinvested dividends or capital
gains distributions will be exchanged first, and thereafter any portions
exchanged will be from the earliest investment made in the Fund from which the
exchange was made.

     Orders for exchanges accepted prior to the close of regular trading on the
New York Stock Exchange on any day the Trust is open for business will be
executed at the respective net asset values determined as of the close of
business that day. Orders for exchanges received after the close of regular

                                       50
<PAGE>
 
trading on the Exchange on any business day will be executed at the respective
net asset values determined at the close of the next business day.

     An excessive number of exchanges may be disadvantageous to the Trust.
Therefore, the Trust, in addition to its right to reject any exchange, reserves
the right to adopt a policy of terminating the exchange privilege of any
shareholder who makes more than a specified number of exchanges in a 12-month
period or in any calendar quarter; provided, that if such a limitation on
exchanges is adopted, exchanges into the PIMCO Money Market Fund from any other
Fund would not be counted.  The Trust reserves the right to modify or
discontinue the exchange privilege at any time.

     The Trust reserves the right to suspend or postpone redemptions during any
period when: (a) trading on the New York Stock Exchange is restricted, as
determined by the SEC, or that Exchange is closed for other than customary
weekend and holiday closings; (b) the SEC has by order permitted such
suspension; or (c) an emergency, as determined by the SEC, exists, making
disposal of portfolio securities or valuation of net assets of the Fund not
reasonably practicable.

     The Trust is committed to paying in cash all requests for redemptions by
any shareholder of record of the Funds, limited in amount with respect to each
shareholder during any 90-day period to the lesser of (i) $250,000, or (ii) 1%
of the net asset value of the Trust at the beginning of such period. Although
the Trust will normally redeem all shares for cash, it may, in unusual
circumstances, redeem amounts in excess of the lesser of (i) or (ii) above by
payment in kind of securities held in the Funds' portfolios.

     Due to the relatively high cost of maintaining smaller accounts, the Trust
reserves the right to redeem shares in any account for their then-current value
(which will be promptly paid to the investor) if at any time, due to shareholder
redemption, the shares in the account do not have a value of at least a
specified amount, the minimums of which are currently set at $250 for Class A,
Class B and Class C shares, $2,000 for Class D shares, and $100,000 for
Institutional Class and Administrative Class shares ($10,000 with respect to
Institutional Class and Administrative Class accounts opened before January 1,
1995).  The Prospectuses may set higher minimum account balances for one or more
classes from time to time depending upon the Trust's current policy.  An
investor will be notified that the value of his account is less than the minimum
and allowed at least 30 days to bring the value of the account up to at least
the specified amount before the redemption is processed.  The Declaration of
Trust also authorizes the Trust to redeem shares under certain other
circumstances as may be specified by the Board of Trustees.  The Trust may also
charge periodic account fees for accounts that fall below minimum balances, as
described in the Prospectuses.

                      PORTFOLIO TRANSACTIONS AND BROKERAGE

Investment Decisions

     Investment decisions for the Trust and for the other investment advisory
clients of the Adviser are made with a view to achieving their respective
investment objectives.  Investment decisions are the product of many factors in
addition to basic suitability for the particular client involved (including the
Trust).  Thus, a particular security may be bought or sold for certain clients
even though it could have been bought or sold for other clients at the same
time.  Likewise, a particular security may be bought for one or more clients
when one or more clients are selling the security.  In some instances, one
client may sell a particular security to another client.  It also sometimes
happens that two or more clients simultaneously purchase or sell the same
security, in which event each day's transactions in such security are, insofar
as possible, averaged as to price and allocated between such clients in a manner
which in the Adviser's opinion is equitable to each and in accordance with the
amount being purchased or sold by each.  There may be circumstances when
purchases or sales of portfolio securities for one or more clients will have an
adverse effect on other clients.

                                       51
<PAGE>
 
Brokerage and Research Services

     There is generally no stated commission in the case of fixed income
securities, which are traded in the over-the-counter markets, but the price paid
by the Trust usually includes an undisclosed dealer commission or mark-up.  In
underwritten offerings, the price paid by the Trust includes a disclosed, fixed
commission or discount retained by the underwriter or dealer.  Transactions on
U.S. stock exchanges and other agency transactions involve the payment by the
Trust of negotiated brokerage commissions.  Such commissions vary among
different brokers.  Also, a particular broker may charge different commissions
according to such factors as the difficulty and size of the transaction.
Transactions in foreign securities generally involve the payment of fixed
brokerage commissions, which are generally higher than those in the United
States.

     The Adviser places all orders for the purchase and sale of portfolio
securities, options and futures contracts for the relevant Fund and buys and
sells such securities, options and futures for the Trust through a substantial
number of brokers and dealers.  In so doing, the Adviser uses its best efforts
to obtain for the Trust the most favorable price and execution available, except
to the extent it may be permitted to pay higher brokerage commissions as
described below.  In seeking the most favorable price and execution, the
Adviser, having in mind the Trust's best interests, considers all factors it
deems relevant, including, by way of illustration, price, the size of the
transaction, the nature of the market for the security, the amount of the
commission, the timing of the transaction taking into account market prices and
trends, the reputation, experience and financial stability of the broker-dealer
involved and the quality of service rendered by the broker-dealer in other
transactions.

     It has for many years been a common practice in the investment advisory
business for advisers of investment companies and other institutional investors
to receive research services from broker-dealers which execute portfolio
transactions for the clients of such advisers.  Consistent with this practice,
the Adviser receives research services from many broker-dealers with which the
Adviser places the Trust's portfolio transactions.  These services, which in
some cases may also be purchased for cash, include such matters as general
economic and security market reviews, industry and company reviews, evaluations
of securities and recommendations as to the purchase and sale of securities.
Some of these services are of value to the Adviser in advising various of its
clients (including the Trust), although not all of these services are
necessarily useful and of value in managing the Trust.  The management fee paid
by the Trust is not reduced because the Adviser and its affiliates receive such
services.

     As permitted by Section 28(e) of the Securities Exchange Act of 1934, the
Adviser may cause the Trust to pay a broker-dealer which provides "brokerage and
research services" (as defined in the Act) to the Adviser an amount of disclosed
commission for effecting a securities transaction for the Trust in excess of the
commission which another broker-dealer would have charged for effecting that
transaction.

     Consistent with the Rules of the NASD and subject to seeking the most
favorable price and execution available and such other policies as the Trustees
may determine, the Adviser may also consider sales of shares of the Trust as a
factor in the selection of broker-dealers to execute portfolio transactions for
the Trust.

Portfolio Turnover

     The Adviser manages the Funds without regard generally to restrictions on
portfolio turnover, except those imposed on their ability to engage in short-
term trading by provisions of the federal tax laws, see "Taxation."  The use of
certain derivative instruments with relatively short maturities may tend to
exaggerate the portfolio turnover rate for some of the Funds.  Trading in fixed
income securities does not generally involve the payment of brokerage
commissions, but does involve indirect transaction costs.  The use of futures
contracts may involve the payment of commissions to futures commission
merchants.  The higher the rate of portfolio turnover of a Fund, the higher
these transaction costs borne by the Fund generally will be.

                                       52
<PAGE>
 
     The portfolio turnover rate of a Fund is calculated by dividing (a) the
lesser of purchases or sales of portfolio securities for the particular fiscal
year by (b) the monthly average of the value of the portfolio securities owned
by the Fund during the particular fiscal year.  In calculating the rate of
portfolio turnover, there is excluded from both (a) and (b) all securities,
including options, whose maturities or expiration dates at the time of
acquisition were one year or less.  Proceeds from short sales and assets used to
cover short positions undertaken are included in the amounts of securities sold
and purchased, respectively, during the year.

                                NET ASSET VALUE

     As indicated under "Net Asset Value" in the Institutional Prospectus and
"How Net Asset Value is Determined" in the Class A, B and C Prospectus, the
Trust's net asset value per share for the purpose of pricing purchase and
redemption orders will be determined once on each day on which the New York
Stock Exchange is open for trading as of the close of regular trading
(ordinarily 4:00 p.m., Eastern time).  Net asset value will not be determined on
the following holidays:  New Year's Day, Martin Luther King, Jr. Day,
President's Day, Good Friday, Memorial Day, Independence Day, Labor Day,
Thanksgiving Day, and Christmas Day.

     The PIMCO Money Market Fund's securities are valued using the amortized
cost method of valuation.  This involves valuing a security at cost on the date
of acquisition and thereafter assuming a constant accretion of a discount or
amortization of a premium to maturity, regardless of the impact of fluctuating
interest rates on the market value of the instrument.  While this method
provides certainty in valuation, it may result in periods during which value, as
determined by amortized cost, is higher or lower than the price the Fund would
receive if it sold the instrument.  During such periods the yield to investors
in the Fund may differ somewhat from that obtained in a similar investment
company which uses available market quotations to value all of its portfolio
securities.

     The SEC's regulations require the PIMCO Money Market Fund to adhere to
certain conditions. The Trustees, as part of their responsibility within the
overall duty of care owed to the shareholders, are required to establish
procedures reasonably designed, taking into account current market conditions
and the Fund's investment objective, to stabilize the net asset value per share
as computed for the purpose of distribution and redemption at $1.00 per share.
The Trustees' procedures include a requirement to periodically monitor, as
appropriate and at such intervals as are reasonable in light of current market
conditions, the relationship between the amortized cost value per share and the
net asset value per share based upon available indications of market value.  The
Trustees will consider what steps should be taken, if any, in the event of a
difference of more than 1/2 of 1% between the two.  The Trustees will take such
steps as they consider appropriate, (e.g., selling securities to shorten the
average portfolio maturity) to minimize any material dilution or other unfair
results which might arise from differences between the two. The Fund also is
required to maintain a dollar-weighted average portfolio maturity of 90 days or
less, to limit its investments to instruments having remaining maturities of 397
days or less (except securities held subject to repurchase agreements having 397
days or less maturity) and to invest only in securities determined by the
Adviser under procedures established by the Board of Trustees to be of high
quality with minimal credit risks.

                                    TAXATION

     The following summarizes certain additional federal income tax
considerations generally affecting the Funds and their shareholders.  The
discussion is for general information only and does not purport to consider all
aspects of U.S. federal income taxation that might be relevant to beneficial
owners of shares of the Funds.  The discussion is based upon current provisions
of the Internal Revenue Code of 1986, as amended (the "Code"), existing
regulations promulgated thereunder, and administrative and judicial
interpretations thereof, all of which are subject to change, which change could
be retroactive.  The discussion applies only to beneficial owners of Fund shares
in whose hands such shares are capital assets

                                       53
<PAGE>
 
within the meaning of Section 1221 of the Code, and may not apply to certain
types of beneficial owners of shares (such as insurance companies, tax exempt
organizations, and broker-dealers) who may be subject to special rules. Persons
who may be subject to tax in more than one country should consult the provisions
of any applicable tax treaty to determine the potential tax consequences to
them. Prospective investors should consult their own tax advisers with regard to
the federal tax consequences of the purchase, ownership and disposition of Fund
shares, as well as the tax consequences arising under the laws of any state,
foreign country, or other taxing jurisdiction. The discussion here and in the
Prospectuses is not intended as a substitute for careful tax planning.
    
     Each Fund intends to qualify annually and elect to be treated as a
regulated investment company under the Code.  To qualify as a regulated
investment company, each Fund generally must, among other things, (a) derive in
each taxable year at least 90% of its gross income from dividends, interest,
payments with respect to securities loans, and gains from the sale or other
disposition of stock, securities or foreign currencies, or other income derived
with respect to its business of investing in such stock, securities or
currencies ("Qualifying Income Test"); (b) diversify its holdings so that, at
the end of each quarter of the taxable year, (i) at least 50% of the market
value of the Fund's assets is represented by cash, U.S. Government securities,
the securities of other regulated investment companies and other securities,
with such other securities of any one issuer limited for the purposes of this
calculation to an amount not greater than 5% of the value of the Fund's total
assets and 10% of the outstanding voting securities of such issuer, and (ii) not
more than 25% of the value of its total assets is invested in the securities of
any one issuer (other than U.S. Government securities or the securities of other
regulated investment companies); and (c) distribute each taxable year the sum of
(i) at least 90% of its investment company taxable income (which includes
dividends, interest and net short-term capital gains in excess of any net long-
term capital losses) and (ii) 90% of its tax exempt interest, net of expenses
allocable thereto.  The Treasury Department is authorized to promulgate
regulations under which gains from foreign currencies (and options, futures, and
forward contracts on foreign currency) would constitute qualifying income for
purposes of the Qualifying Income Test only if such gains are directly related
to investing in securities.  To date, such regulations have not been issued.
     
    
     As a regulated investment company, a Fund generally will not be subject to
U.S. federal income tax on its investment company taxable income and net capital
gains (any net long-term capital gains in excess of the sum of net short-term
capital losses and capital loss carryovers from prior years) designated by the
Fund as capital gain dividends, if any, that it distributes to shareholders on a
timely basis.  Each Fund intends to distribute to its shareholders, at least
annually, all or substantially all of its investment company taxable income and
any net capital gains.  In addition, amounts not distributed by a Fund on a
timely basis in accordance with a calendar year distribution requirement are
subject to a nondeductible 4% excise tax. To avoid the tax, a Fund must
distribute during each calendar year an amount equal to the sum of (1) at least
98% of its ordinary income (not taking into account any capital gains or losses)
for the calendar year, (2) at least 98% of its capital gains in excess of its
capital losses (and adjusted for certain ordinary losses) for the twelve month
period ending on October 31, and (3) all ordinary income and capital gains for
previous years that were not distributed during such years.  A distribution will
be treated as paid on December 31 of the calendar year if it is declared by a
Fund in October, November, or December of that year to shareholders of record on
a date in such a month and paid by the Fund during January of the following
year.  Such distributions will be taxable to shareholders (other than those not
subject to federal income tax) in the calendar year in which the distributions
are declared, rather than the calendar year in which the distributions are
received.  To avoid application of the excise tax, each Fund intends to make its
distributions in accordance with the calendar year distribution requirement. 
     

     The PIMCO Municipal Bond Fund must have at least 50% of its total assets
invested in Municipal Bonds at the end of each calendar quarter so that
dividends derived from its net interest income on Municipal Bonds and so
designated by the Fund will be "exempt-interest dividends," which are generally
exempt from federal income tax when received by an investor.  Certain exempt-
interest dividends, as described in the Class A, B and C Prospectus, may
increase alternative minimum taxable income for purposes of determining a
shareholder's liability for the alternative minimum tax.  In addition, exempt-

                                       54
<PAGE>
 
interest dividends allocable to interest from certain "private activity bonds"
will not be tax exempt for purposes of the regular income tax to shareholders
who are "substantial users" of the facilities financed by such obligations or
"related persons" of "substantial users."  The tax-exempt portion of dividends
paid for a calendar year constituting "exempt-interest dividends" will be
designated after the end of that year and will be based upon the ratio of net
tax-exempt income to total net income earned by the Fund during the entire year.
That ratio may be substantially different than the ratio of net tax-exempt
income to total net income earned during a portion of the year.  Thus, an
investor who holds shares for only a part of the year may be allocated more or
less tax-exempt interest dividends than would be the case if the allocation were
based on the ratio of net tax-exempt income to total net income actually earned
by the Fund while the investor was a shareholder.  All or a portion of interest
on indebtedness incurred or continued by a shareholder to purchase or carry
shares of the PIMCO Municipal Bond Fund will not be deductible by the
shareholder.  The portion of interest that is not deductible is equal to the
total interest paid or accrued on the indebtedness multiplied by the percentage
of the Fund's total distributions (not including distributions of the excess of
net long-term capital gains over net short-term capital losses) paid to the
shareholder that are exempt-interest dividends.  Under rules used by the
Internal Revenue Service for determining when borrowed funds are considered used
for the purpose of purchasing or carrying particular assets, the purchase of
shares may be considered to have been made with borrowed funds even though such
funds are not directly traceable to the purchase of shares.

     Shareholders of the PIMCO Municipal Bond Fund receiving social security or
railroad retirement benefits may be taxed on a portion of those benefits as a
result of receiving tax exempt income (including exempt-interest dividends
distributed by the Fund).  The tax may be imposed on up to 50% of a recipient's
benefits in cases where the sum of the recipient's adjusted gross income (with
certain adjustments, including tax-exempt interest) and 50% of the recipient's
benefits, exceeds a base amount.  In addition, up to 85% of a recipient's
benefits may be subject to tax if the sum of the recipient's adjusted gross
income (with certain adjustments, including tax-exempt interest) and 50% of the
recipient's benefits exceeds a higher base amount.  Shareholders receiving
social security or railroad retirement benefits should consult with their tax
advisors.

     In years when a Fund distributes amounts in excess of its earnings and
profits, such distributions may be treated in part as a return of capital.  A
return of capital is not taxable to a shareholder and has the effect of reducing
the shareholder's basis in the shares.  Since certain of the PIMCO Municipal
Bond Fund's expenses attributable to earning tax-exempt income do not reduce
such Fund's current earnings and profits, it is possible that distributions, if
any, in excess of such Fund's net tax-exempt and taxable income will be treated
as taxable dividends to the extent of such Fund's remaining earnings and profits
(i.e., the amount of such expenses).

Distributions

     Except for exempt-interest dividends paid by the PIMCO Municipal Bond Fund,
all dividends and distributions of a Fund, whether received in shares or cash,
generally are taxable and must be reported on each shareholder's federal income
tax return. Dividends paid out of a Fund's investment company taxable income
will be taxable to a U.S. shareholder as ordinary income.  Distributions
received by tax-exempt shareholders will not be subject to federal income tax to
the extent permitted under the applicable tax exemption.

     A portion of the dividends paid by the PIMCO StocksPLUS Fund may qualify
for the deduction for dividends received by corporations. Dividends paid by the
other Funds generally are not expected to qualify for the deduction for
dividends received by corporations, although certain distributions from the
PIMCO High Yield Fund may qualify. Distributions of net capital gains, if any,
designated as capital gain dividends, are taxable as long-term capital gains,
regardless of how long the shareholder has held a Fund's shares and are not
eligible for the dividends received deduction. Any distributions that are not
from a Fund's investment company taxable income or net realized capital gains
may be characterized as a return of capital to shareholders or, in some cases,
as capital gain.  The tax treatment of dividends and distribu-

                                       55
<PAGE>
 
tions will be the same whether a shareholder reinvests them in additional shares
or elects to receive them in cash.

Sales of Shares

     Upon the disposition of shares of a Fund (whether by redemption, sale or
exchange), a shareholder will realize a gain or loss.  Such gain or loss will be
capital gain or loss if the shares are capital assets in the shareholder's
hands, and will be long-term or short-term generally depending upon the
shareholder's holding period for the shares.  Any loss realized on a disposition
will be disallowed to the extent the shares disposed of are replaced within a
period of 61 days beginning 30 days before and ending 30 days after the shares
are disposed of.  In such a case, the basis of the shares acquired will be
adjusted to reflect the disallowed loss. Any loss realized by a shareholder on a
disposition of shares held by the shareholder for six months or less will be
treated as a long-term capital loss to the extent of any distributions of
capital gain dividends received by the shareholder with respect to such shares.

Backup Withholding

     A Fund may be required to withhold 31% of all taxable distributions payable
to shareholders who fail to provide the Fund with their correct taxpayer
identification number or to make required certifications, or who have been
notified by the Internal Revenue Service that they are subject to backup
withholding. Corporate shareholders and certain other shareholders specified in
the Code generally are exempt from such backup withholding.  Backup withholding
is not an additional tax.  Any amounts withheld may be credited against the
shareholder's U.S. federal tax liability.

Options, Futures and Forward Contracts, and Swap Agreements

     Some of the options, futures contracts, forward contracts, and swap
agreements used by the Funds may be "section 1256 contracts."  Any gains or
losses on section 1256 contracts are generally considered 60% long-term and 40%
short-term capital gains or losses ("60/40") although certain foreign currency
gains and losses from such contracts may be treated as ordinary in character.
Also, section 1256 contracts held by a Fund at the end of each taxable year
(and, for purposes of the 4% excise tax, on certain other dates as prescribed
under the Code) are "marked to market" with the result that unrealized gains or
losses are treated as though they were realized and the resulting gain or loss
is treated as ordinary or 60/40 gain or loss.

     Generally, the hedging transactions and certain other transactions in
options, futures and forward contracts undertaken by a Fund, may result in
"straddles" for U.S. federal income tax purposes.  In some cases, the straddle
rules also could apply in connection with swap agreements.  The straddle rules
may affect the character of gains (or losses) realized by a Fund.  In addition,
losses realized by a Fund on positions that are part of a straddle may be
deferred under the straddle rules, rather than being taken into account in
calculating the taxable income for the taxable year in which such losses are
realized.  Because only a few regulations implementing the straddle rules have
been promulgated, the tax consequences of transactions in options, futures,
forward contracts, and swap agreements to a Fund are not entirely clear. The
transactions may increase the amount of short-term capital gain realized by a
Fund which is taxed as ordinary income when distributed to shareholders.

     A Fund may make one or more of the elections available under the Code which
are applicable to straddles.  If a Fund makes any of the elections, the amount,
character and timing of the recognition of gains or losses from the affected
straddle positions will be determined under rules that vary according to the
election(s) made.  The rules applicable under certain of the elections operate
to accelerate the recognition of gains or losses from the affected straddle
positions.

     Because application of the straddle rules may affect the character of gains
or losses, defer losses and/or accelerate the recognition of gains or losses
from the affected straddle positions, the amount which

                                       56
<PAGE>
 
must be distributed to shareholders, and which will be taxed to shareholders as
ordinary income or long-term capital gain, may be increased or decreased
substantially as compared to a fund that did not engage in such hedging
transactions.

     Rules governing the tax aspects of swap agreements are in a developing
stage and are not entirely clear in certain respects.  Accordingly, while the
Funds intend to account for such transactions in a manner they deem to be
appropriate, the Internal Revenue Service might not accept such treatment.  If
it did not, the status of a Fund as a regulated investment company might be
affected.  The Trust intends to monitor developments in this area.  Certain
requirements that must be met under the Code in order for a Fund to qualify as a
regulated investment company may limit the extent to which a Fund will be able
to engage in swap agreements.

     The qualifying income and diversification requirements applicable to a
Fund's assets may limit the extent to which a Fund will be able to engage in
transactions in options, futures contracts, forward contracts, and swap
agreements.

Short Sales

     Certain Funds may make short sales of securities.  Short sales may increase
the amount of short-term capital gain realized by a Fund, which is taxed as
ordinary income when distributed to shareholders.

Passive Foreign Investment Companies

     Certain Funds may invest in the stock of foreign corporations which may be
classified under the Code as passive foreign investment companies ("PFICs").  In
general, a foreign corporation is classified as a PFIC for a taxable year if at
least one-half of its assets constitute investment-type assets or 75% or more of
its gross income is investment-type income.  If a Fund receives a so-called
"excess distribution" with respect to PFIC stock, the Fund itself may be subject
to tax on a portion of the excess distribution, whether or not the corresponding
income is distributed by the Fund to stockholders.  In general, under the PFIC
rules, an excess distribution is treated as having been realized ratably over
the period during which the Fund held the PFIC stock.  A Fund itself will be
subject to tax on the portion, if any, of an excess distribution that is so
allocated to prior taxable years and an interest factor will be added to the
tax, as if the tax had been payable in such prior taxable years.  Certain
distributions from a PFIC as well as gain from the sale of PFIC stock are
treated as excess distributions.  Excess distributions are characterized as
ordinary income even though, absent application of the PFIC rules, certain
excess distributions might have been classified as capital gain.
    
     A Fund may be eligible to elect alternative tax treatment with respect to
PFIC stock.  Under an election that currently is available in some
circumstances, a Fund generally would be required to include in its gross income
its share of the earnings of a PFIC on a current basis, regardless of whether
distributions are received from the PFIC in a given year.  If this election were
made, the special rules, discussed above, relating to the taxation of excess
distributions, would not apply.  Alternatively, another election may be
available that would involve marking to market a Fund's PFIC shares at the end
of each taxable year (and on certain other dates prescribed in the Code), with
the result that unrealized gains are treated as though they were realized and
reported as ordinary income. Any mark-to-market losses and any loss from an
actual disposition of PFIC shares would be deductible as ordinary losses to the
extent of any net mark-to-market gains included in income in prior years. If
this election were made, tax at the Fund level under the PFIC rules would
generally be eliminated, but the Fund could, in limited circumstances, incur
nondeductible interest charges.  A Fund's intention to qualify annually as a
regulated investment company may limit its elections with respect to PFIC
shares.      

     Because the application of the PFIC rules may affect, among other things,
the character of gains and the amount of gain or loss and the timing of the
recognition of income with respect to PFIC shares, and may subject a Fund itself
to tax on certain income from PFIC shares, the amount that must be distributed

                                       57
<PAGE>
 
to shareholders and will be taxed to shareholders as ordinary income or long-
term capital gain may be increased or decreased substantially as compared to a
fund that did not invest in PFIC shares.

Foreign Currency Transactions

     Under the Code, gains or losses attributable to fluctuations in exchange
rates which occur between the time a Fund accrues income or other receivables or
accrues expenses or other liabilities denominated in a foreign currency and the
time the Fund actually collects such receivables or pays such liabilities
generally are treated as ordinary income or loss.  Similarly, on disposition of
debt securities denominated in a foreign currency and on disposition of certain
other instruments, gains or losses attributable to fluctuations in the value of
the foreign currency between the date of acquisition of the security or contract
and the date of disposition also are treated as ordinary gain or loss.  These
gains and losses, referred to under the Code as "section 988" gains or losses,
may increase or decrease the amount of a Fund's investment company taxable
income to be distributed to its shareholders as ordinary income.

Foreign Taxation
    
     Income received by the Funds from sources within foreign countries may be
subject to withholding and other taxes imposed by such countries.  Tax
conventions between certain countries and the U.S. may reduce or eliminate such
taxes.  In addition, the Adviser intends to manage the Funds with the intention
of minimizing foreign taxation in cases where it is deemed prudent to do so.  If
more than 50% of the value of the PIMCO Global Bond, Global Bond II, Foreign
Bond, International Bond, Emerging Markets Bond or Emerging Markets Bond II
Funds' total assets at the close of their taxable year consists of securities of
foreign corporations, such Fund will be eligible to elect to "pass-through" to
the Fund's shareholders the amount of foreign income and similar taxes paid by
the Fund. If this election is made, a shareholder generally subject to tax will
be required to include in gross income (in addition to taxable dividends
actually received) his pro rata share of the foreign taxes paid by the Fund, and
may be entitled either to deduct (as an itemized deduction) his or her pro rata
share of foreign taxes in computing his taxable income or to use it (subject to
limitations) as a foreign tax credit against his or her U.S. federal income tax
liability.  No deduction for foreign taxes may be claimed by a shareholder who
does not itemize deductions.  Each shareholder will be notified within 60 days
after the close of the Fund's taxable year whether the foreign taxes paid by the
Fund will "pass-through" for that year.      
    
     Generally, a credit for foreign taxes is subject to the limitation that it
may not exceed the shareholder's U.S. tax attributable to his or her total
foreign source taxable income.  For this purpose, if the pass-through election
is made, the source of the PIMCO Global Bond, Global Bond II, Foreign Bond,
International Bond, Emerging Markets Bond or Emerging Markets Bond II Funds'
income will flow through to shareholders of the Trust.  With respect to such
Funds, gains from the sale of securities will be treated as derived from U.S.
sources and certain currency fluctuation gains, including fluctuation gains from
foreign currency-denominated debt securities, receivables and payables will be
treated as ordinary income derived from U.S. sources.  The limitation on the
foreign tax credit is applied separately to foreign source passive income, and
to certain other types of income.  Shareholders may be unable to claim a credit
for the full amount of their proportionate share of the foreign taxes paid by
the Fund.  The foreign tax credit can be used to offset only 90% of the revised
alternative minimum tax imposed on corporations and individuals and foreign
taxes generally are not deductible in computing alternative minimum taxable
income.      

Original Issue Discount and Market Discount

     Some of the debt securities (with a fixed maturity date of more than one
year from the date of issuance) that may be acquired by a Fund may be treated as
debt securities that are issued originally at a discount.  Generally, the amount
of the original issue discount ("OID") is treated as interest income and is
included in income over the term of the debt security, even though payment of
that amount is not received until a later time, usually when the debt security
matures.  A portion of the OID includable in income with

                                       58
<PAGE>
 
respect to certain high-yield corporate debt securities may be treated as a
dividend for Federal income tax purposes.

     Some of the debt securities (with a fixed maturity date of more than one
year from the date of issuance) that may be acquired by a Fund in the secondary
market may be treated as having market discount.  Generally, any gain recognized
on the disposition of, and any partial payment of principal on, a debt security
having market discount is treated as ordinary income to the extent the gain, or
principal payment, does not exceed the "accrued market discount" on such debt
security.  Market discount generally accrues in equal daily installments.  A
Fund may make one or more of the elections applicable to debt securities having
market discount, which could affect the character and timing of recognition of
income.

     Some debt securities (with a fixed maturity date of one year or less from
the date of issuance) that may be acquired by a Fund may be treated as having
acquisition discount, or OID in the case of certain types of debt securities.
Generally, the Fund will be required to include the acquisition discount, or
OID, in income over the term of the debt security, even though payment of that
amount is not received until a later time, usually when the debt security
matures.  The Fund may make one or more of the elections applicable to debt
securities having acquisition discount, or OID, which could affect the character
and timing of recognition of income.

     A Fund generally will be required to distribute dividends to shareholders
representing discount on debt securities that is currently includable in income,
even though cash representing such income may not have been received by the
Fund.  Cash to pay such dividends may be obtained from sales proceeds of
securities held by the Fund.

Constructive Sales

     Recently enacted rules may affect the timing and character of gain if a
Fund engages in transactions that reduce or eliminate its risk of loss with
respect to appreciated financial positions.  If a Fund enters into certain
transactions in property while holding substantially identical property, the
Fund would be treated as if it had sold and immediately repurchased the property
and would be taxed on any gain (but not loss) from the constructive sale.  The
character of gain from a constructive sale would depend upon the Fund's holding
period in the property.  Loss from a constructive sale would be recognized when
the property was subsequently disposed of, and its character would depend on the
Fund's holding period and the application of various loss deferral provisions of
the Code.

Other Taxation

     Distributions also may be subject to additional state, local and foreign
taxes, depending on each shareholder's particular situation.  Under the laws of
various states, distributions of investment company taxable income generally are
taxable to shareholders even though all or a substantial portion of such
distributions may be derived from interest on certain federal obligations which,
if the interest were received directly by a resident of such state, would be
exempt from such state's income tax ("qualifying federal  obligations").
However, some states may exempt all or a portion of such distributions from
income tax to the extent the shareholder is able to establish that the
distribution is derived from qualifying federal obligations.  Moreover, for
state income tax purposes, interest on some federal obligations generally is not
exempt from taxation, whether received directly by a shareholder or through
distributions of investment company taxable income (for example, interest on
FNMA Certificates and GNMA Certificates).  Each Fund will provide information
annually to shareholders indicating the amount and percentage of a Fund's
dividend distribution which is attributable to interest on federal obligations,
and will indicate to the extent possible from what types of federal obligations
such dividends are derived.  Shareholders are advised to consult their own tax
advisers with respect to the particular tax consequences to them of an
investment in a Fund.

                                       59
<PAGE>
 
                               OTHER INFORMATION

Capitalization

     The Trust is a Massachusetts business trust established under a Declaration
of Trust dated February 19, 1987.  The capitalization of the Trust consists
solely of an unlimited number of shares of beneficial interest with a par value
of $0.0001 each.  The Board of Trustees may establish additional series (with
different investment objectives and fundamental policies) at any time in the
future.  Establishment and offering of additional series will not alter the
rights of the Trust's shareholders.  When issued, shares are fully paid, non-
assessable, redeemable and freely transferable.  Shares do not have preemptive
rights or subscription rights.  In liquidation of a Fund, each shareholder is
entitled to receive his pro rata share of the net assets of that Fund.

     Expenses incurred by the Trust in connection with its organization and the
public offering of its shares were deferred and amortized on a straight line
basis over a period not less than five years.  Expenses incurred in the
organization of subsequently offered Funds are charged to those Funds and are
being amortized on a straight line basis over a period not less than five years.

Performance Information

     The Trust may, from time to time, include the yield and effective yield of
the PIMCO Money Market Fund, and the yield and total return for each class of
shares of all of the Funds, computed in accordance with SEC-prescribed formulas,
in advertisements or reports to shareholders or prospective investors. As noted
below, in accordance with methods approved by the Securities and Exchange
Commission in various pronouncements, total return presentations for periods
prior to the inception date of a particular class of a Fund are based on the
historical performance of an older class of the Fund (specified below) restated
to reflect the current sales charges (if any) of the newer class, but not
reflecting any higher operating expenses such as 12b-1 distribution and
servicing fees and administration fees associated with the newer class.  All
other things being equal, such higher expenses would have adversely affected
(i.e., reduced) total return for the newer classes by the amount of such higher
expenses compounded over the relevant periods.  The Funds also may compute
current distribution rates and use this information in their prospectuses and
statement of additional information, in reports to current shareholders, or in
certain types of sales literature provided to prospective investors.

     Current yield for the PIMCO Money Market Fund will be based on the change
in the value of hypothetical investment (exclusive of capital changes) over a
particular 7-day period less a pro-rata share of Fund expenses accrued over that
period (the "base period"), and stated as a percentage of the investment at the
start of the base period (the "base period return").  The base period return is
then annualized by multiplying by 365/7, with the resulting yield figure carried
to at least the nearest hundredth of one percent. "Effective yield" for the
PIMCO Money Market Fund assumes that all dividends received during an annual
period have been reinvested.  Calculation of "effective yield" begins with the
same "base period return" used in the calculation of yield, which is then
annualized to reflect weekly compounding pursuant to the following formula:

            Effective Yield = [(Base Period Return +1)/365/7/] - 1

     The yield of the PIMCO Money Market Fund for the seven day period ended
September 30, 1997 was as follows:  Institutional Class - 5.31%, Administrative
Class - 5.07%, Class A - 5.02%, Class B - 4.16% and Class C - .05%.  The
effective yield of the PIMCO Money Market Fund for the seven day period ended
September 30, 1997 was as follows:  Institutional Class - 5.47%, Administrative
Class - 5.18%, Class A - 5.20%, Class B - 4.21% and Class C - 5.18%.

     Quotations of yield for the remaining Funds will be based on all investment
income per share (as defined by the SEC) during a particular 30-day (or one
month) period (including dividends and interest),

                                       60
<PAGE>
 
less expenses accrued during the period ("net investment income"), and are
computed by dividing net investment income by the maximum offering price per
share on the last day of the period, according to the following formula:

          YIELD = 2[(a-b + 1) (To the power of 6) -1]
                     ---         
                     cd

     where   a = dividends and interest earned during the period,

             b = expenses accrued for the period (net of reimbursements),

             c = the average daily number of shares outstanding during the
                 period that were entitled to receive dividends, and

             d = the maximum offering price per share on the last day of the
                 period.
    
     For the one month period ended March 31, 1998, the yield of the Funds was
as follows (all numbers are annualized) (Class D shares were not offered during
the period listed):      
<TABLE>     
<CAPTION>
                                              Yield for Period
                                            Ended March 31, 1998
                                         --------------------------
                             Institutional    Administrative
                             -------------    ---------------- 
Fund                             Class            Class                A         B         C    
- --------------------------   -------------    ----------------       -----     -----     ----- 
<S>                          <C>              <C>                    <C>       <C>       <C>  
Money Market Fund                                                                             
Short-Term Fund                       6.00%               5.75%      5.47%     4.86%     5.29%
Low Duration Fund                     5.77%               5.52%      5.13%     4.52%     4.79%
Low Duration Fund II                  5.40%               5.15%       N/A       N/A       N/A 
Low Duration Fund III                 5.33%                N/A        N/A       N/A       N/A 
Low Duration Mortgage                 5.85%                N/A        N/A       N/A       N/A 
Moderate Duration Fund                5.80%                N/A        N/A       N/A       N/A 
Real Return Bond Fund                 4.62%                N/A       4.09%     3.45%     3.72% 
Total Return Fund                     5.73%               5.47%      5.01%     4.48%     4.49% 
Total Return Fund II                  5.42%               5.16%       N/A       N/A       N/A 
Total Return Fund III                 5.66%               5.41%       N/A       N/A       N/A 
Total Return Mortgage                 5.87%                N/A        N/A       N/A       N/A 
High Yield                            7.48%               7.22%      6.75%     6.31%     6.31% 
Long-Term U.S. Govt.                  5.30%               5.05%      4.68%     4.13%     4.13% 
Global Bond Fund                      6.30%               5.96%       N/A       N/A       N/A 
Global Bond Fund II                   6.02%                N/A       5.44%     4.95%     4.95% 
Foreign Bond Fund                     6.56%               6.31%      5.82%     5.34%     5.34% 
International Bond Fund               6.26%                N/A        N/A       N/A       N/A 
Emerging Markets Bond                 7.49%                N/A       6.77%     6.31%     6.34% 
Strategic Balanced Fund               5.55%                N/A        N/A       N/A       N/A 
StocksPLUS Fund                       5.40%               5.15%      4.86%     4.33%     4.55% 
</TABLE>      

     The yield of each such Fund will vary from time to time depending upon
market conditions, the composition of the Fund's portfolio and operating
expenses of the Trust allocated to the Fund or its classes of shares.  These
factors, possible differences in the methods used in calculating yield (and the
tax exempt status of distributions for the PIMCO Municipal Bond Fund) should be
considered when comparing a Fund's yield to yields published for other
investment companies and other investment vehicles.  Yield should also be
considered relative to changes in the value of a Fund's various classes of
shares.  These yields do not take into account any applicable contingent
deferred sales charges.

                                       61
<PAGE>
 
     The PIMCO Municipal Bond Fund may advertise a tax equivalent yield of each
class of its shares, calculated as described above except that, for any given
tax bracket, net investment income of each class will be calculated using as
gross investment income an amount equal to the sum of (i) any taxable income of
each class of the Fund plus (ii) the tax exempt income of each class of the Fund
divided by the difference between 1 and the effective federal income tax rates
for taxpayers in that tax bracket.  For example, taxpayers with the marginal
federal income tax rates indicated in the following table would have to earn the
tax equivalent yields shown in order to realize an after-tax return equal to the
corresponding tax-exempt yield shown.
<TABLE>
<CAPTION>
                                                                                       A tax-exempt yield of
Filing Status                                                                    is equivalent to a taxable yield of
<S>                      <C>                        <C>                    <C>        <C>        <C>       <C>       <C>
Single                   (Married filing jointly)                               3%         4%         5%        6%       7%
<CAPTION> 
Taxable income                                      Marginal tax rate*
<S>                      <C>                        <C>                    <C>        <C>        <C>       <C>       <C>
$23,350 or less          $39,000 or less                   15%               3.53%      4.71%     5.88%     7.06%     8.24%
Over $23,350 but         Over $39,000 but                  28%               4.17%      5.56%     6.94%     8.33%     9.72%
  not over $56,550       not over $94,250                              
Over $56,550 but         Over $94,250 but                  31%               4.35%      5.80%     7.25%     8.70%    10.14%
  not over $117,950      not over $143,600                             
Over $117,950 but        Over $143,600 but                 36%               4.69%      6.25%     7.81%     9.38%    10.94%
  not over $256,500      not over $256,500                             
Over $256,500            Over $256,500                     39.6%             4.97%      6.62%     8.28%     9.93%    11.59%
</TABLE>
- -------------------
* These marginal tax rates do not take into account the effect of the phaseout
  of itemized deductions and personal exemptions.

     As is shown in the above table, the advantage of tax-exempt investing
becomes more advantageous to an investor as his or her marginal tax rate
increases.

     The Trust, in its advertisements, may refer to pending legislation from
time to time and the possible impact of such legislation on investors,
investment strategy and related matters.  This would include any tax proposals
and their effect on marginal tax rates and tax-equivalent yields.  At any time
in the future, yields and total return may be higher or lower than past yields
and there can be no assurance that any historical results will continue.

     Quotations of average annual total return for a Fund or class will be
expressed in terms of the average annual compounded rate of return of a
hypothetical investment in the Fund or class over periods of one, five and ten
years (up to the life of the Fund), calculated pursuant to the following
formula:  P (1 + T)/n/ = ERV (where P = a hypothetical initial payment of
$1,000, T = the average annual total return, n = the number of years, and ERV =
the ending redeemable value of a hypothetical $1,000 payment made at the
beginning of the period). Except as noted below all total return figures reflect
the deduction of a proportional share of Fund or class expenses on an annual
basis, and assume that (i) the maximum sales load (or other charges deducted
from payments) is deducted from the initial $1,000 payment and that the maximum
contingent deferred sales charge, if any, is deducted at the times, in the
amounts, and under the terms disclosed in the Prospectuses and (ii) all
dividends and distributions are reinvested when paid. The Funds also may, with
respect to certain periods of less than one year, provide total return
information for that period that is unannualized. Quotations of total return may
also be shown for other periods. Any such information would be accompanied by
standardized total return information.
    
     The table below sets forth the average annual total return of each class of
shares of the following Funds for the periods ended March 31, 1998.  For periods
prior to the "Inception Date" of a particular class of a Fund's shares, total
return presentations for the class are based on the historical performance of
Institutional Class shares of the Fund (the oldest class) adjusted, as
necessary, to reflect any current sales charges (including any contingent
deferred sales charges) associated with the newer class and any different      

                                       62
<PAGE>
     
operating expenses associated with the newer class, such as 12b-1 distribution
and servicing fees (which are not paid by the Institutional Class) and
administrative fee charges.      
                   
                Total Return for Periods Ended March 31, 1998*     

<TABLE>     
<CAPTION>
                                                                     Since Inception   Inception   Inception
                                                                        of Fund         Date of     Date of
     Fund            Class**       1 Year    5 Years    10 Years      (Annualized)       Fund        Class
- ------------------------------------------------------------------------------------------------------------
<S>               <C>              <C>       <C>        <C>         <C>                <C>         <C>
Money Market      Institutional      5.40%      4.80%     N/A                  4.63%    03/01/91    03/01/91
                  Administrative     5.12       4.55                           4.38                 01/25/95
                  Class A            5.10       4.53                           4.37                 01/13/97
                  Class B            4.21       3.61                           3.45                 01/13/97
                  Class C            5.14       4.54                           4.38                 01/13/97
- ------------------------------------------------------------------------------------------------------------
Short-Term        Institutional      7.06%      6.14%       6.58%              6.60%    10/07/87    10/07/87
                  Administrative     6.80       5.88        6.32               6.34                 02/01/96
                  Class A            4.51       5.29        5.94               5.98                 01/20/97
                  Class B            0.95       4.63        5.38               5.41                 01/20/97
                  Class C            5.33       5.41        5.84               5.87                 01/20/97
                  Class D            6.74       5.83        6.26               6.29                 04/08/98
- ------------------------------------------------------------------------------------------------------------
Low Duration      Institutional      9.00%      6.63%       8.26%              8.29%    05/11/87    05/11/87
                  Administrative     8.73       6.36        7.99               8.02                 01/03/95
                  Class A            5.24       5.49        7.43               7.49                 01/13/97
                  Class B            2.68       5.02        6.96               6.99                 01/13/97
                  Class C            7.01       5.62        7.23               7.26                 01/13/97
                  Class D            8.66       6.29        7.92               7.95                 04/08/98
- ------------------------------------------------------------------------------------------------------------
Low Duration II   Institutional      8.29%      5.96%     N/A                  6.53%    11/01/91    11/01/91
- ------------------------------------------------------------------------------------------------------------
Low Duration III  Institutional      7.93%     N/A        N/A                  6.80%    12/31/96    12/31/96
- ------------------------------------------------------------------------------------------------------------
Low Duration      Institutional     N/A        N/A        N/A                  5.86%+   07/31/97    07/31/97
Mortgage
- ------------------------------------------------------------------------------------------------------------
Moderate          Institutional      9.80%     N/A        N/A                  7.57%    12/31/96    12/31/96
Duration
- ------------------------------------------------------------------------------------------------------------
Real Return       Institutional      4.70%     N/A        N/A                  4.09%    01/29/97    01/29/97
Bond              Class A            1.00                                      0.99                 01/29/97
                  Class B           -1.41                                     -0.42                 01/29/97
                  Class C            2.74                                      3.13                 01/29/97
                  Class D            4.27                                      3.67                 04/08/98
 
- ------------------------------------------------------------------------------------------------------------
Total Return      Institutional     12.63%      7.78%       9.96%              9.82%    05/11/87    05/11/87
                  Administrative    12.36       7.52        9.70               9.56                 09/08/94
                  Class A            7.07       6.31        8.96               8.87                 01/13/97
                  Class B            6.26       6.21        8.67               8.54                 01/13/97
                  Class C           10.28       6.52        8.67               8.54                 01/13/97
                  Class D           12.30       7.45        9.63               9.49                 04/08/98
- ------------------------------------------------------------------------------------------------------------
Total Return II   Institutional     11.99%      7.42%     N/A                  8.21%    12/30/91    12/30/91
                  Administrative    11.71       7.15                           7.94                 11/30/94
- ------------------------------------------------------------------------------------------------------------
Total Return III  Institutional     12.62%      7.96%     N/A                  9.61%    05/01/91    05/01/91
                  Administrative    12.33       7.68                           9.34                 04/11/97
- ------------------------------------------------------------------------------------------------------------
Total Return      Institutional     N/A        N/A        N/A                6.69%+     07/31/97    07/31/97
Mortgage
- ------------------------------------------------------------------------------------------------------------
</TABLE>      

                                       63
<PAGE>
 
<TABLE>     
<CAPTION>
                                                                     Since Inception   Inception   Inception
                                                                        of Fund         Date of     Date of
     Fund            Class**       1 Year    5 Years    10 Years      (Annualized)       Fund        Class
- ------------------------------------------------------------------------------------------------------------
<S>               <C>              <C>       <C>        <C>         <C>                <C>         <C>
High Yield        Institutional     15.26%     12.46%     N/A                 13.08%    12/16/92    12/16/92
                  Administrative    14.98      12.19                          12.81                 01/16/95
                  Class A            9.63      11.01                          11.69                 01/13/97
                  Class B            8.94      10.98                          11.74                 01/13/97
                  Class C           12.95      11.25                          11.86                 01/13/97
                  Class D           14.86      12.05                          12.67                 04/08/98
- ------------------------------------------------------------------------------------------------------------
Long-Term U.S.    Institutional     20.23%      9.65%     N/A                 12.76%    07/01/91    07/01/91
Government        Administrative    19.94       9.39                          12.51                 09/23/97
                  Class A           14.39       8.24                          11.59                 01/20/97
                  Class B           13.85       8.16                          11.54                 01/20/97
                  Class C           17.85       8.45                          11.56                 01/20/97
- ------------------------------------------------------------------------------------------------------------
Global Bond       Institutional      5.85%     N/A        N/A                  8.01%    11/23/93    11/23/93
                  Administrative     5.57                                      7.76                 07/31/96
- ------------------------------------------------------------------------------------------------------------
Foreign Bond      Institutional     12.64%     11.31%     N/A                 11.59%    12/03/92    12/03/92
                  Administrative    12.34      11.04                          11.33                 01/28/97
                  Class A            7.09       9.80                          10.15                 01/20/97
                  Class B            6.28       9.73                          10.18                 01/20/97
                  Class C           10.29      10.01                          10.31                 01/20/97
                  Class D           12.17      10.83                          11.12                 04/08/98
- ------------------------------------------------------------------------------------------------------------
International     Institutional     11.49%      9.35%     N/A                  9.44%    12/13/89    12/13/89
Bond
- ------------------------------------------------------------------------------------------------------------
Emerging          Institutional     N/A        N/A        N/A                3.10%+     07/31/97    07/31/97
Markets Bond      Class A                                                    -2.67+                 07/31/97
                  Class B                                                    -3.80+                 07/31/97
                  Class C                                                     1.99+                 07/31/97
 
- ------------------------------------------------------------------------------------------------------------
Municipal Bond    Institutional     N/A        N/A        N/A                  0.80%    12/31/97    12/31/97
                  Class A                                                     -2.32                 04/01/98
                  Class B                                                     -4.47                 04/01/98
                  Class C                                                     -0.42                 04/01/98
                  Class D                                                      0.70                 04/08/98
- ------------------------------------------------------------------------------------------------------------
Strategic         Institutional     33.40%     N/A        N/A                 25.67%    06/28/96    06/28/96
Balanced          Class D           32.87                                     25.12                 04/08/98
 
- ------------------------------------------------------------------------------------------------------------
StocksPLUS        Institutional     47.75%     N/A        N/A                 24.57%    05/13/93    05/13/93
                  Administrative    47.19                                     24.23                 01/07/97
                  Class A           42.66                                     23.32                 01/20/97
                  Class B           41.11                                     23.01                 01/20/97
                  Class C           45.38                                     23.47                 01/20/97
                  Class D           47.22                                     24.09                 04/08/98
- ------------------------------------------------------------------------------------------------------------
</TABLE>      
      
  +  unannualized      
      
  *  Average annual total return presentations for a particular class of shares
  assume payment of the current maximum sales charge (if any) applicable to that
  class at the time of purchase and assume that the maximum CDSC (if any) for
  Class A, Class B and Class C shares was deducted at the times, in the amounts,
  and under the terms discussed in the Class A, B and C Prospectus.      
      
  **  For all Funds listed above, Class A, Class B, Class C, Class D and
  Administrative Class total return presentations for periods prior to the
  Inception Date of that class reflect the prior performance of Institutional
  Class shares of the Fund (the oldest class) adjusted to reflect the actual
  sales charges      

                                       64
<PAGE>
     
  (none in the case of Class D and Administrative Class) of the newer class. The
  adjusted performance also reflects the higher Fund operating expenses
  associated with Class A, Class B, Class C, Class D and Administrative Class
  shares. These include (i) 12b-1 distribution and servicing fees, which are not
  paid by the Institutional Class but are paid by Class B and Class C (at a
  maximum rate of 1.00% per annum) and Class A and the Administrative Class (at
  a maximum rate of 0.25% per annum), and may be paid by Class D (at a maximum
  of 0.25% per annum), and (ii) administration fee charges associated with Class
  A, Class B and Class C shares (at a maximum differential of 0.22% per annum)
  and Class D shares (at a maximum differential of 0.45% per annum).      
    
     The table below sets forth the average annual total return of certain
classes of shares of the PIMCO Global Bond Fund II (which was a series of PIMCO
Advisors Funds ("PAF") prior to its reorganization as a Fund of the Trust on
January 17, 1997) for the periods ended March 31, 1998. Accordingly, "Inception
Date of Fund" refers to the inception date of the PAF predecessor series. Since
Class A shares were offered since the inception of PIMCO Global Bond Fund II,
total return presentations for periods prior to the Inception Date of the
Institutional Class are based on the historical performance of Class A shares,
adjusted to reflect that the Institutional Class does not have a sales charge,
and the different operating expenses associated with the Institutional Class,
such as 12b-1 distribution and servicing fees and administration fee charges. 
     
                    
                Total Return for Periods Ended March 31, 1998*      

<TABLE>     
<CAPTION>
                                                                     Since Inception   Inception   Inception
                                                                        of Fund         Date of     Date of
     Fund            Class**       1 Year    5 Years    10 Years      (Annualized)       Fund        Class
- ------------------------------------------------------------------------------------------------------------
<S>               <C>              <C>       <C>        <C>         <C>                <C>         <C>
Global Bond II    Institutional    11.65%     N/A       N/A                12.76%      10/02/95    02/25/98
                  Class A           6.20                                    9.78                   10/02/95
                  Class B           5.82                                    9.93                   10/02/95
                  Class C           9.47                                   10.96                   10/02/95
- ------------------------------------------------------------------------------------------------------------
</TABLE>      
      
  *  Average annual total return presentations for a particular class of shares
  assume payment of the current maximum sales charge (if any) applicable to that
  class at the time of purchase and assume that the maximum CDSC (if any) for
  Class A, Class B and Class C shares was deducted at the times, in the amounts,
  and under the terms discussed in the Class A, B and C Prospectus.      
      
  **  Institutional Class total return presentations for periods prior to the
  Inception Date of that class reflect the prior performance of Class A shares
  of the former PAF series, adjusted to reflect the fact that there are no sales
  charges on Institutional Class shares of the Fund. The adjusted performance
  also reflects any different operating expenses associated with Institutional
  Class shares.  These include (i) 12b-1 distribution and servicing fees, which
  are not paid by the Institutional Class but are paid by Class A (at a maximum
  rate of 0.25% per annum), and (ii) administration fee charges, which are lower
  for Institutional class shares (at a differential of 0.15% per annum).      
      
  Note also that, prior to January 17, 1997, Class A, Class B and Class C shares
  of the PIMCO Global Bond Fund II were subject to a variable level of expenses
  for such services as legal, audit, custody and transfer agency services. As
  described in the Class A, B and C Prospectus, for periods subsequent to
  January 17, 1997, Class A, Class B and Class C shares of the Trust are subject
  to a fee structure which essentially fixes these expenses (along with other
  administrative expenses) under a single administrative fee based on the
  average daily net assets of the Fund attributable to Class A, Class B and
  Class C shares. Under the current fee structure, the PIMCO Global Bond Fund II
  is expected to have lower total Fund operating expenses than its predecessor
  had under the fee structure for PAF      

                                       65
<PAGE>
     
  (prior to January 17, 1997). All other things being equal, the higher expenses
  of PAF would have adversely affected total return performance for the Fund
  after January 17, 1997.      
    
  The method of adjustment used in the table above for periods prior to the
  Inception Date of Institutional Class shares of the PIMCO Global Bond Fund II
  resulted in performance for the period shown which is higher than if the
  historical Class A performance were not adjusted to reflect the lower
  operating expenses of the newer class.  The following table shows the lower
  performance figures that would be obtained if the performance for the
  Institutional Class was calculated by tacking to the Institutional Class'
  actual performance the actual performance of Class A shares (with their higher
  operating expenses) for periods prior to the initial offering date of the
  newer class (i.e. the total return presentations below are based, for periods
  prior to the inception date of the Institutional Class, on the historical
  performance of Class A shares adjusted to reflect the current sales charges
  associated with Class A shares, but not reflecting lower operating expenses
                                      ---                                    
  associated with the Institutional Class, such as lower administrative fee
  charges and/or distribution and servicing fee charges).      
                     
                 Total Return for Periods Ended March 31, 1998
        (with no adjustment for operating expenses of the Institutional
                Class for periods prior to its Inception Date)      

<TABLE>     
<CAPTION>
                                                                             Since Inception
                                                                                 of Fund
     Fund               Class        1 Year       5 Years       10 Years       (Annualized)
- ----------------------------------------------------------------------------------------------
<S>                 <C>              <C>          <C>            <C>        <C>
Global Bond II      Institutional    11.25%       N/A            N/A                12.33%
- ----------------------------------------------------------------------------------------------
</TABLE>      

     Current distribution information for a Fund will be based on distributions
for a specified period (i.e., total dividends from net investment income),
divided by Fund net asset value per share on the last day of the period and
annualized according to the following formula:

            DIVIDEND YIELD = (((a/b)*365)/c)

     where  a =   actual dividends distributed for the calendar month in
                  question,

            b =   number of days of dividend declaration in the month in
                  question, and

            c =   net asset value (NAV) calculated on the last business day of
                  the month in question.

     The rate of current distributions does not reflect deductions for
unrealized losses from transactions in derivative instruments such as options
and futures, which may reduce total return. Current distribution rates differ
from standardized yield rates in that they represent what a Fund has declared
and paid to shareholders as of the end of a specified period rather than the
Fund's actual net investment income for that same period. Distribution rates
will exclude net realized short-term capital gains. The rate of current
distributions for a Fund should be evaluated in light of these differences and
in light of the Fund's total return figures, which will always accompany any
calculation of the rate of current distributions.
    
     For the month ended March 31, 1998, the current distribution rates
(annualized) for the Funds were as follows (Class D shares were not offered
during the period listed):      

                                       66
<PAGE>
 
<TABLE>     
<CAPTION>
                                                     Distribution Rate
                                                     ------------------
                                    Institutional     Administrative
                                    -------------    -----------------
Fund                                    Class             Class                A          B         C     
- ---------------------------------   -------------    -----------------       -----      -----     ----- 
<S>                                 <C>              <C>                     <C>        <C>       <C>  
Money Market Fund                            5.22%                4.96%      4.93%      4.07%     4.98%
Short-Term Fund                              6.00%                5.75%      5.62%      4.83%     5.31%
Low Duration Fund                            6.47%                6.22%      5.99%      5.23%     5.49%
Low Duration Fund II                         5.74%                5.18%       N/A        N/A       N/A 
Low Duration Fund III                        5.57%                 N/A        N/A        N/A       N/A 
Low Duration Mortgage Fund                   6.49%                 N/A        N/A        N/A       N/A 
Moderate Duration Fund                       6.10%                 N/A        N/A        N/A       N/A 
Real Return Bond Fund                        3.98%                 N/A       3.31%      2.91%     3.08%
Total Return Fund                            5.26%                5.01%      4.79%      4.04%     4.04%
Total Return Fund II                         6.02%                5.77%       N/A        N/A       N/A 
Total Return Fund III                        5.46%                5.21%       N/A        N/A       N/A 
Total Return Mortgage Fund                   5.84%                 N/A        N/A        N/A       N/A 
High Yield Fund                              8.50%                8.26%      8.11%      7.36%     7.36%
Long-Term U.S. Government Fund               5.86%                5.61%      5.50%      4.72%     4.69%
Global Bond Fund                             6.78%                6.51%       N/A        N/A       N/A 
Global Bond Fund II                          5.62%                 N/A       5.22%      4.47%     4.47%
Foreign Bond Fund                            4.97%                4.75%      4.53%      3.77%     3.77%
International Bond Fund                       N/A                  N/A        N/A        N/A       N/A 
Emerging Markets Bond Fund                   7.96%                 N/A       7.66%      6.80%     6.82%
Strategic Balanced Fund                       N/A                  N/A        N/A        N/A       N/A 
StocksPLUS Fund                               N/A                  N/A        N/A        N/A       N/A  
</TABLE>      

     Performance information for a Fund may also be compared to various
unmanaged indexes, such as the Standard & Poor's 500 Composite Stock Price
Index, the Dow Jones Industrial Average, the Lehman Brothers Aggregate Bond
Index, the Lehman Brothers Mortgage-Backed Securities Index, the Merrill Lynch
1 to 3 Year Treasury Index, the Lehman Intermediate and 20+ Year Treasury Blend
Index, the Lehman BB Intermediate Corporate Index, indexes prepared by Lipper
Analytical Services, the J.P. Morgan Global Index, the J.P. Morgan Emerging
Markets Bond Index Plus, the Salomon Brothers World Government Bond Index-10 Non
U.S.-Dollar Hedged and the J.P. Morgan Government Bond Index Non U.S.-Dollar
Hedged. Unmanaged indexes (i.e., other than Lipper) generally do not reflect
deductions for administrative and management costs and expenses. PIMCO may
report to shareholders or to the public in advertisements concerning the
performance of PIMCO as adviser to clients other than the Trust, or on the
comparative performance or standing of PIMCO in relation to other money
managers. PIMCO also may provide current or prospective private account clients,
in connection with standardized performance information for the Funds,
performance information for the Funds gross of fees and expenses for the purpose
of assisting such clients in evaluating similar performance information provided
by other investment managers or institutions. Comparative information may be
compiled or provided by independent ratings services or by news organizations.
Any performance information, whether related to the Funds or to the Adviser,
should be considered in light of the Funds' investment objectives and policies,
characteristics and quality of the Funds, and the market conditions during the
time period indicated, and should not be considered to be representative of what
may be achieved in the future.

     Advertisements and information relating to the PIMCO Global Bond Fund II
may use data comparing the total returns of the top foreign bond market as
compared to the total return of the U.S. bond market for a particular year. For
instance, the following table sets forth the total return of the top foreign
bond market compared to the total return for the U.S. bond market for the years
1986 through 1996. Performance is shown in U.S. dollar terms, hedged for
currency rate changes and is no way indicative of the performance of the PIMCO
Global Bond Fund II.

                                       67
<PAGE>

<TABLE>    
<CAPTION>  
               Top Foreign
     Year      Performer               U.S.
     ----      -----------            ------
     <S>       <C>                    <C> 
     1986      +13.1%   Japan         +15.7%
     1987      +12.8    UK             +1.9
     1988      +15.0    France         +7.0
     1989      +10.0    Canada        +14.4
     1990      +11.0    Australia      +8.6
     1991      +20.0    Australia     +15.3
     1992      +10.5    UK             +7.2
     1993      +20.0    Italy         +11.0
     1994       -0.9    Japan          -3.4
     1995      +21.0    Netherlands   +18.3
     1996      +18.8    Spain          +2.7
     1997      +13.5    UK             +9.6
</TABLE>     
    
  Source: Salomon Brothers World Government Bond Index 1986-1997.      
    
     The Trust may use, in its advertisements and other information, data
concerning the projected cost of a college education in future years based on
1996/1997 costs of college and an assumed rate of increase for such costs. For
example, the table below sets forth the projected cost of four years of college
at a public college and a private college assuming a steady increase in both
cases of 3% per year. In presenting this information, the Trust is making no
prediction regarding what will be the actual growth rate in the cost of a
college education, which may be greater or less than 3% per year and may vary
significantly from year to year. The Trust makes no representation that an
investment in any of the Funds will grow at or above the rate of growth of the
cost of a college education.      
 
Potential College Cost Table

<TABLE>     
<CAPTION> 
Start     Public       Private       Start       Public        Private
Year      College      College       Year        College       College
- ------    --------     -------       -----       -------       -------
<S>       <C>          <C>           <C>         <C>           <C>  
1997      $13,015      $57,165        2005       $16,487       $72,415
1998      $13,406      $58,880        2006       $16,982       $74,587
1999      $13,808      $60,646        2007       $17,491       $76,825
2000      $14,222      $62,466        2008       $18,016       $79,130
2001      $14,649      $64,340        2009       $18,557       $81,504
2002      $15,088      $66,270        2010       $19,113       $83,949
2003      $15,541      $68,258        2011       $19,687       $86,467
2004      $16,007      $70,306        2012       $20,278       $89,061
</TABLE>      
    
Costs assume a steady increase in the annual cost of college of 3% per year from
a 1996-97 base year amount. Actual rates of increase may be more or less than 3%
and may vary.      
    
     In its advertisements and other materials, the Trust may compare the
returns over periods of time of investments in stocks, bonds and treasury bills
to each other and to the general rate of inflation. For example, the average
annual return of each during the 25 years from 1973 to 1997 was:      

<TABLE>     
     <S>              <C> 
     *Stocks:         13.1%
      Bonds:           9.5%
      T-Bills:         7.1%
      Inflation:       5.5%
</TABLE>      

     *Returns of unmanaged indices do not reflect past or future performance of
any of the Funds of PIMCO Funds:  Pacific Investment Management Series.  Stocks
are represented by Ibbotson's Common 

                                       68
<PAGE>
 
Stock Total Return Index. Bonds are represented by Ibbotson's Long-term
Corporate Bond Index. T-bills are represented by Ibbotson's Treasury Bill Index
and Inflation is represented by the Cost of Living Index. These are all
unmanaged indices, which can not be invested in directly. While Treasury bills
are insured and offer a fixed rate of return, both the principal and yield of
investment securities will fluctuate with changes in market conditions. Source:
Ibbotson, Roger G., and Rex A. Sinquefiled, Stocks, Bonds, Bill and Inflation
(SBBI), 1989, updated in Stocks, Bonds, Bills and Inflation 1997 Yearbook,
Ibbotson Associates, Chicago. All rights reserved.
    
     The Trust may also compare the relative historic returns and range of
returns for an investment in each of common stocks, bonds and treasury bills to
a portfolio that blends all three investments. For example, over the 25 years
from 1973-1997, the average annual return of stocks comprising the Ibbotson's
Common Stock Total Return Index ranged from -26.5% to 37.4% while the annual
return of a hypothetical portfolio comprised 40% of such common stocks, 40% of
bonds comprising the Ibbotson's Long-term Corporate bond Index and 20% of
Treasury bills comprising the Ibbotson's Treasury Bill Index (a "mixed
portfolio") would have ranged from -10.2% to 28.2% over the same period. The
average annual returns of each investment for each of the years from 1973
through 1997 is set forth in the following table.      

<TABLE>     
<CAPTION> 
 
                                                        MIXED
YEAR       STOCKS    BONDS    T-BILLS    INFLATION    PORTFOLIO
- --------   -------   ------   --------   ----------   ----------
<S>        <C>       <C>      <C>        <C>          <C>   
1973       -14.66%    1.14%      6.93%        8.80%       -4.02%
1974       -26.47%   -3.06%      8.00%       12.26%      -10.21%
1975        37.20%   14.64%      5.80%        7.01%       21.90%
1976        23.84%   18.65%      5.08%        4.81%       18.01%
1977        -7.18%    1.71%      5.12%        6.77%       -1.17%
1978         6.56%   -0.07%      7.18%        9.03%        4.03%
1979        18.44%   -4.18%     10.38%       13.31%        7.78%
1980        32.42%    2.61%     11.24%       12.40%       14.17%
1981        -4.91%   -0.96%     14.71%        8.94%        0.59%
1982        21.41%   43.79%     10.54%        3.87%       28.19%
1983        22.51%    4.70%      8.80%        3.80%       12.64%
1984         6.27%   16.39%      9.85%        3.95%       11.03%
1985        32.16%   30.90%      7.72%        3.77%       26.77%
1986        18.47%   19.85%      6.16%        1.13%       16.56%
1987         5.23%   -0.27%      5.46%        4.41%        3.08%
1988        16.81%   10.70%      6.35%        4.42%       12.28%
1989        31.49%   16.23%      8.37%        4.65%       20.76%
1990        -3.17%    6.87%      7.52%        6.11%        2.98%
1991        30.55%   19.79%      5.88%        3.06%       21.31%
1992         7.67%    9.39%      3.51%        2.90%        7.53%
1993        10.06%   13.17%      2.89%        2.75%        9.84%
1994         1.31%   -5.76%      3.90%        2.67%       -1.00%
1995        37.40%   27.20%      5.60%        2.70%       26.90%
1996        23.10%    1.40%      5.20%        3.30%       10.84%
1997        33.40%   12.90%      7.10%        1.70%       19.94%
</TABLE>      

*Returns of unmanaged indices do not reflect past or future performance of any
of the Funds  of PIMCO Funds:  Pacific Investment Management Series. Stocks are
represented by Ibbotson's Common Stock Total Return Index. Bonds are represented
by Ibbotson's Long-term Corporate Bond Index. T'bills are represented by
Ibbotson's Treasury Bill Index and Inflation is represented by the Cost of
Living Index. These are all unmanaged indices, which can not be invested in
directly. While Treasury bills are insured and offer a fixed rate of return,
both the principal and yield of investment securities will fluctuate with
changes in market conditions. Source: Ibbotson, Roger G., and Rex A.
Sinquefiled, Stocks, Bonds, Bill and Inflation (SBBI), 1989, updated in Stocks,
Bonds, Bills and Inflation 1997 Yearbook, Ibbotson Associates, Chicago. All
rights reserved.

                                       69
<PAGE>
 
     The Trust may use in its advertisement and other materials examples
designed to demonstrate the effect of compounding when an investment is
maintained over several or many years. For example, the following table shows
the annual and total contributions necessary to accumulate $200,000 of savings
(assuming a fixed rate of return) over various periods of time:
 
          Investment      Annual            Total             Total
          Period          Contribution      Contribution      Saved
          ------------    ------------      ------------      --------
          30 Years             $ 1,979          $ 59,370      $200,000
          25 Years             $ 2,955          $ 73,875      $200,000
          20 Years             $ 4,559          $ 91,180      $200,000
          15 Years             $ 7,438          $111,570      $200,000
          10 Years             $13,529          $135,290      $200,000
                                            
                                            
This hypothetical example assumes a fixed 7% return compounded annually and a
guaranteed return of principal. The example is intended to show the benefits of
a long-term, regular investment program, and is in no way representative of any
past or future performance of a PIMCO Fund. There can be no guarantee that you
will be able to find an investment that would provide such a return at the times
you invest and an investor in any of the PIMCO Funds should be aware that
certain of the PIMCO Funds have experienced periods of negative growth in the
past and may again in the future.           
    
     The Trust may set forth in its advertisements and other materials
information regarding the relative reliance in recent years on personal savings
for retirement income versus reliance on Social Security benefits and company
sponsored retirement plans. For example, the following table offers such
information for 1997:      
<TABLE>     
<CAPTION> 
               % of Income for Individuals
               Aged 65 Years and Older in 1997*
               --------------------------------

               Social Security
 Year          and Pension Plans         Other
 ----          -----------------         -----
<S>            <C>                       <C> 
 1997                         43%         57%
</TABLE>      

     * For individuals with an annual income of at least $51,000.  Other
includes personal savings, earnings and other undisclosed sources of income.
Source:  Social Security Administration.

     Articles or reports which include information relating to performance,
rankings and other characteristics of the Funds may appear in various national
publications and services including, but not limited to: The Wall Street
Journal, Barron's, Pensions and Investments, Forbes, Smart Money, Mutual Fund
Magazine, The New York Times, Kiplinger's Personal Finance, Fortune, Money
Magazine, Morningstar's Mutual Fund Values, CDA Investment Technologies and The
Donoghue Organization. Some or all of these publications or reports may publish
their own rankings or performance reviews of mutual funds, including the Funds,
and may provide information relating to the Adviser, including descriptions of
assets under management and client base, and opinions of the author(s) regarding
the skills of personnel and employees of the Adviser who have portfolio
management responsibility. From time to time, the Trust may include references
to or reprints of such publications or reports in its advertisements and other
information relating to the Funds.

     From time to time, the Trust may set forth in its advertisements and other
materials information about the growth of a certain dollar-amount invested in
one or more of the Funds over a specified period of time and may use charts and
graphs to display that growth.

                                       70
<PAGE>
 
     Ibbotson Associates ("Ibbotson") has analyzed the risk and returns of the
Funds and relevant benchmark market indexes in a variety of market conditions.
Based on its independent research and analysis, Ibbotson has developed model
portfolios of the Funds and series of PIMCO Funds: Multi-Manager Series ("MMS")
which indicate how, in Ibbotson's opinion, a hypothetical investor with a 5+
year investment horizon might allocate his or her assets among the Funds and
series of MMS.  Ibbotson bases its model portfolios on five levels of investor
risk tolerance which it developed and defines as ranging from "Very
Conservative" (low volatility; emphasis on capital preservation, with some
growth potential) to "Very Aggressive" (high volatility; emphasis on long-term
growth potential).  However, neither Ibbotson nor the Trust offers Ibbotson's
model portfolios as investments.  Moreover, neither the Trust, the Adviser nor
Ibbotson represent or guarantee that investors who allocate their assets
according to Ibbotson's models will achieve their desired investment results.

Voting Rights

     Under the Declaration of Trust, the Trust is not required to hold annual
meetings of Trust shareholders to elect Trustees or for other purposes.  It is
not anticipated that the Trust will hold shareholders' meetings unless required
by law or the Declaration of Trust.  In this regard, the Trust will be required
to hold a meeting to elect Trustees to fill any existing vacancies on the Board
if, at any time, fewer than a majority of the Trustees have been elected by the
shareholders of the Trust.  In addition, the Declaration of Trust provides that
the holders of not less than two-thirds of the outstanding shares of the Trust
may remove a person serving as Trustee either by declaration in writing or at a
meeting called for such purpose.  The Trustees are required to call a meeting
for the purpose of considering the removal of a person serving as Trustee if
requested in writing to do so by the holders of not less than ten percent of the
outstanding shares of the Trust.  In the event that such a request was made, the
Trust has represented that it would assist with any necessary shareholder
communications.  Shareholders of a class of shares have different voting rights
with respect to matters that affect only that class.
    
  The Trust's shares do not have cumulative voting rights, so that the holder of
more than 50% of the outstanding shares may elect the entire Board of Trustees,
in which case the holders of the remaining shares would not be able to elect any
Trustees. As of July 7, 1998, the following persons owned of record or
beneficially 5% or more of the noted class of shares of the following Funds: 
     

                                       71
<PAGE>
 
<TABLE>     
<CAPTION>
                                            Shares            Percentage of
                                         Beneficially          Outstanding
                                            Owned             Shares Owned
                                         --------------       -------------
<S>                                      <C>                  <C>
PIMCO Money Market Fund
Institutional
- -------------
Batrus & Co.                             11,216,856.460            23.52%
P. O. Box 9005
Church Street Station
New York, New York  10015
 
California Community Foundation          10,789,119.000            22.62%
606 South Olive Street, Suite 2400
Los Angeles, California  90014
 
QueensCare                               10,000,000.000            20.97%
1300 N. Vermont Avenue #907 D&T
Los Angeles, California  90027
 
Stussy Inc.                               3,108,342.860             6.51%
1852 Langley Avenue
Irvine, California
 
Charles Schwab & Co., Inc. Rein           2,562,618.290             5.37%
101 Montgomery Street
San Francisco, California  94104
 
Administrative
- --------------
Maltrust & Co. (Hooker & Holcombe, Inc.)    380,127.070            21.01%
225 Essex Street
Salem, Massachusetts  01970
 
Class A
- -------
Carn & Co.                                8,233,206.440            13.54%
PIMCO Advisors
401K Savings and Investment Plan
P. O. Box 96211
Washington D.C.  20090-6211
 
Unibank SA Luxembourg                     5,596,829.450             9.20%
672 Rue de Neudorf
Findel
P. O. Box 562
L2015 Luxembourg

Union Bank of California                  3,633,531.030             5.97%
The Faroah Group A California
Limited Partnership
P. O. BOX 2969
Saratoga, California  95070-0969
</TABLE>      

                                       72
<PAGE>
 
<TABLE>     
<CAPTION> 
                                                         Shares       Percentage of
                                                      Beneficially     Outstanding
                                                         Owned         Shares Owned
                                                    --------------    -------------
<S>                                                <C>                <C> 
PIMCO Money Market Fund
 
Class B
- -------
Robert W. Baird & Co., Inc.                            331,533.980            8.51%
A/C 4574-6139
777 East Wisconsin Avenue
Milwaukee, Wisconsin  53201-5391
 
DLJ Securities Corporation, Inc. **                    261,633.740            6.72%
Securities Corporation Inc.
P. O. Box 2052
Jersey City, New Jersey  07303-9998
 
RPSS TR IRA                                            227,609.390            5.84%
FBO Sanford Summers
3595 Avanti Lane
Uniontown, Ohio  44685-8850
 
Class C
- -------
WD Jennett & C. Cooper & TJ Viola                    6,000,000.000           10.91%
COTR UA MAR 01 68
Gilbert Kelly Crowley Jennett Retirement Trust
1200 Wilshire Blvd., Ste. 6
Los Angeles, California  90017-1908
 
PIMCO Short-Term Fund
 
Institutional
- -------------
William Barron Hilton Trustee                       14,910,536.779           39.67%*
9336 Civic Center Drive
Beverly Hills, California  90210
 
Soka University of America                           4,545,427.695           12.09%
26800 W. Mulholland Highway
Attention: Arnold Kawasaki
Calabasas, California  91302
 
Charles Schwab & Co., Inc. **                        2,274,245.328            6.05%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Trustee of Columbia University                       2,129,587.799            5.66%
  in the City of New York
Office of Investments
475 Riverside Drive, Suite 401
New York, New York  10115

Administrative
- --------------
Northwestern Trust                                      56,166.702           22.66%
1201 Third Avenue
Seattle, Washington  98101
</TABLE>      

                                       73
<PAGE>
<TABLE>     
<CAPTION>  
                                                                   Shares       Percentage of
                                                             Beneficially        Outstanding
                                                                    Owned        Shares Owned
                                                                    -----        ------------
PIMCO Short-Term Fund

Administrative
- ---------------
<S>                                                          <C>                <C>
First National Bank as Trustee for **                          44,849.091           18.10%   
Lau & Co.                                                                                    
100 West Houston                                                                             
San Antonio, Texas  78296                                                                    
                                                                                             
Class A                                                                                      
- -------                                                                                      
Marronald S. Taft TR                                          597,023.688           15.91%   
Artist Management Inc.                                                                       
Defined Benefit Pension Plan 61284                                                           
18 W. 55th Street, Apt. 4                                                                    
New York, New York  10019-5368                                                               
                                                                                             
MLPF&S For the Sole Benefit of its Customers **               462,666.555           12.33%   
Attention: Fund Administration #97MY2                                                        
4800 Deer Lake Drive E. Floor 3                                                              
Jacksonville, Florida 32246-6484                                                             
                                                                                             
Mr. Ronald S. Taft TR                                         453,181.719           12.07%   
Ronald S. Taft Employee Defined Benefit Plan 1184                                            
18 W. 55th Street, Apt. 4                                                                    
New York, New York  10019-5368                                                               
                                                                                             
Smith Barney Inc.                                             210,217.723            5.60%   
00165244008                                                                                  
388 Greenwich Street                                                                         
New York, New York  10013                                                                    
                                                                                             
Dain Rauscher Inc. FBO                                        202,784.869            5.40%   
Otto Candies Inc.                                                                            
Capital Construction Fund                                                                    
Account B                                                                                    
P. O. Box 25                                                                                 
Des Allemands, Louisiana  70030                                                              
                                                                                             
Investment Company Institute                                  201,516.436            5.37%   
Attention:  Brian Donnellan                                                                  
1401 H. Street NW                                                                            
Washington DC 20005-2110                                                                     
                                                                                             
Painwebber for the Benefit of Adventist                       188,968.294            5.03%    
Healthcare Inc. - Fixed Income
Dan Bowen
1801 Research Blvd., Suite 300
Rockville, Maryland  20850-3152
</TABLE>      

                                       74
<PAGE>

<TABLE>     
<CAPTION> 
 
                                                      Shares       Percentage of
                                                   Beneficially     Outstanding
                                                      Owned        Shares Owned
                                                   ------------    -------------

PIMCO Short-Term Fund

Class B
- -------
<S>                                                <C>             <C>
MLPF&S For the Sole Benefit of its Customers **      94,621.616          63.17%*
Attention: Fund Administration #97M35
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
Prudential Securities Inc. FBO                       14,637.127           9.77%
Mr. Joseph P. Knight
IRA Rollover DTD 012098
12654 S. Central Avenue
Palos Heights, Illinois  60463-2414
 
Class C
- -------
MLPF&S For the Sole Benefit of its Customers **     222,430.470          29.21%*
Attention: Fund Administration #97M36
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
Prudential Securities FBO                            43,399.086           5.69%
Oakwood Orthopaedic Clinic PA
PS P&T DTD 123074
Drs. Manning & Evins TTEES
13 Edgewood Drive
Greenville, South Caroline  29605-4235
 
Class D
- -------
PIMCO Advisors L.P.                                  10,053.152          99.99%*
Attention: Vinh Nguyen
800 Newport Center Drive
Newport Beach, California  92660-6309
 
PIMCO Low Duration Fund
 
Institutional
- -------------
Charles Schwab & Co., Inc. Rein                  30,168,830.092          10.51%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Administrative
- --------------
Centurion Trust Co.                               4,859,627.175          40.45%*
801 Pennsylvania
Kansas City, Missouri  64105
 
Certain Employee (Fidelity) **                    2,098,497.189          17.46%
100 Magellan KW1C
Covington, Kentucky  41015
</TABLE>      

                                       75
<PAGE>
 
<TABLE>     
<CAPTION>
                                                      Shares      Percentage of
                                                   Beneficially    Outstanding
                                                      Owned       Shares Owned
                                                   ------------   -------------
<S>                                                <C>            <C>
PIMCO Low Duration Fund                            
                                                   
Administrative                                     
- --------------                                     
McClatchy Newspapers Defined Comp. Inv. Plan       1,546,455.973     12.87%
550 Kearny Street #600                             
San Francisco, California  94108                   
                                                   
Sonnenschein, Nath & Rosenthal                     1,074,046.905      8.94%
P. O. Box 419260                                   
Kansas City, Missouri  64141-6260                  
                                                   
Class A                                            
- -------                                            
Richard J. Steinhelper Tr                          3,420,011.025     25.48%*
Michigan Tooling Association                       
Benefit Plans Investment Trust                     
28237 Orchard Lake Road                            
P. O. Box 9151                                     
Farmington Hills, Michigan  48333-9151             
                                                   
MLPF&S For the Sole Benefit of its Customers **    2,471,622.048     18.41%
Attention: Fund Administration                     
4800 Deer Lake Drive E. Floor 3                    
Jacksonville, Florida 32246-6484                   
                                                   
Class B                                            
- -------                                            
MLPF&S For the Sole Benefit of its Customers **      606,912.135     23.57%
Attention: Fund Administration #97M35              
4800 Deer Lake Drive E. Floor 3                    
Jacksonville, Florida 32246-6484                   
                                                   
Class C                                            
- -------                                            
MLPF&S For the Sole Benefit of its Customers **    1,913,640.838     26.06%*
Attention: Fund Administration #97M36              
4800 Deer Lake Drive E. Floor 3                    
Jacksonville, Florida 32246-6484                   
                                                   
Class D                                            
- -------                                            
Charles Schwab & Co., Inc.                            62,621.158     86.28%*
Special Custody Accounts
FBO Customers
Attention: Mutual Funds
101 Montgomery Street
San Francisco, California  94104-4122

PIMCO Advisors L.P.                                    9,953.510     13.71%
Attention: Vinh Nguyen
800 Newport Center Drive
Newport Beach, California  92660-6309
</TABLE>       

                                       76
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                <C>             <C>
PIMCO Low Duration Fund II
 
Institutional
- -------------
Sprint Retirement Savings Plan                     14,590,087.196      35.97%*
82 Devonshire Street - E1GA                        
Boston, Massachusetts  02109                       
                                                   
American Bible Society                              6,629,577.317      16.34%
1865 Broadway                                      
New York, New York  10023                          
                                                   
Salt River Project Decom Trust                      3,390,115.242       8.35%
P. O. Box 52025                                    
Phoenix, Arizona  85072                            
                                                   
University of Illinois Foundation                   2,214,052.173       5.45%
1305 West Green Street                             
Urbana, Illinois  61801                            
                                                   
Administrative                                     
- --------------                                     
National Financial Services Corporation **              5,884.957     100.00%*
1 World Financial Center                           
200  Liberty Street                                
New York, New York 10281                           
                                                   
PIMCO Low Duration Fund III                        
                                                   
Institutional                                      
- -------------                                      
Loyola Academy Endowment Fund                         872,891.158      38.05%*
135 S. LaSalle Street                              
P. O. Box 1443                                     
Chicago, Illinois  60690                           
                                                   
Sisters of St. Joseph/Michigan                        735,660.592      32.07%*
3427 Gull Road                                     
P. O. Box 13                                       
Nazareth, Michigan  49074                          
                                                   
Charles Schwab & Co., Inc. Rein                       135,642.156       5.91%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104

PIMCO Low Duration Mortgage Fund

Institutional
- -------------
Charles Schwab & Co., Inc. Rein                        24,958.879     100.00%*
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
</TABLE>      

                                       77
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                <C>             <C>
PIMCO Moderate Duration Fund
 
Institutional
- -------------
Mercantile Stores Company, Inc.                    7,501,216.541       24.35%
Attention:  Robert Bienkowski                                       
111 Wall Street                                                     
New York, New York  10005                                           
                                                                    
Sparrow Health Systems                             5,617,662.465       18.23%
Mutual Funds Operations                                             
Pittsburgh, Pennsylvania  15230-3198                                
                                                                    
Columbus Circle Trust co-SV                        3,603,383.593       11.69%
1 Station Place Metro Center                                        
Stamford, Connecticut  06902                                        
                                                                    
Baystate Health System Inc.                        2,791,584.907        9.06%
Mutual Funds Operations                                             
P. O. Box 3198                                                      
Pittsburgh, Pennsylvania  15230-3198                                
                                                                    
Washington Teamsters                               1,716,438.503        5.57%
Attention:  Jack Cowan                                              
2323 Eastlake Avenue E.                                             
Seattle, Washington  98102                                          
                                                                    
St. John Hospital of Detroit, Michigan             1,668,656.596        5.41%
P. O. Box 771072                                                    
Detroit, Michigan  48277-1072                                       
                                                                    
Baystate Health Systems                            1,553,670.148        5.04%
Mutual Funds Operations                            
P. O. Box 3198                                     
Pittsburgh, Pennsylvania  15230-3198               
                                                   
PIMCO Real Return Bond Fund                        
                                                   
Institutional                                      
- -------------                                      
National Financial Services Corporation **           385,308.407       74.06%*
1 World Financial Center
200 Liberty Street
New York, New York 10281

Charles Schwab & Co., Inc. Rein                       66,614.818       12.80%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
</TABLE>      

                                       78
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                 <C>            <C>
PIMCO Real Return Bond Fund

Institutional
- -------------
Hofstra University                                   51,994.061         9.99%
128 Hofstra University                                               
Hempstead, New York  11549                                           
                                                                     
Class A                                                              
- -------                                                              
Prudential Securities Inc.                           16,168.257        47.01%*
Dima Ventures Inc.                                                   
Fund Account                                                         
4199 Campus Drive, Suite 830                                         
Irvine, California  92612-2698                                       
                                                                     
NFSC FEBO #A7D-059501                                 5,350.272        15.55%
NFSC/FMTC IRA ROLLOVER                                               
FBO Jeanette Mazzer                                                  
303 E. 57th Street, New York, New York 10022                         
                                                                     
U.S. Clearing Corporation                             4,193.410        12.19%
FBO 013-92879-16                                                     
26 Broadway                                                          
New York, New York 10004-1798                                        
                                                                     
Everen Clearing Corporation                           3,450.925        10.03%
A/C 2030-0694                                                        
Robert M. Calcote &                                                  
Genevieve E. Calcote Ten Com.                                        
111 East Kilbourn Avenue                                             
Milwaukee, Wisconsin  53202                                          
                                                                     
Class B                                                              
- -------                                                              
MLPF&S For the Sole Benefit of its Customers **      59,005.621        23.46%
Attention: Fund Administration                                       
4800 Deer Lake Drive E. Floor 3                                      
Jacksonville, Florida 32246-6484                                     
                                                                     
Dain Rauscher Inc. FBO                               24,378.374         9.69%
Evangelical Free Church of America                                   
EFCM Project & Capital #2                                            
Attention: William V. Arvold III                                     
901 East 78th Street                                                 
Minneapolis, Minnesota  55420-1300                                   
                                                                     
Dain Rauscher Inc. FBO                               14,997.893         5.96%
Evangelical Free Church of America
SEI Managed Account - Fixed Income
901 East 78th Street
Minneapolis, Minnesota  55420-1300
</TABLE>      

                                       79
<PAGE>
 
<TABLE>    
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                               <C>              <C>
PIMCO Real Return Bond Fund

Class B
- -------
Dain Rauscher Inc. FBO                                13,964.651        5.55%
Roger Wheeler TTEE
Daniel Stanley Trust
U/A DTD 6/7/91
16186 Boswell Road
Rockford, Illinois  61072-9705
 
Class C
- -------
Bear Stearns Securities Corporation                   20,569.116        7.36%
FBO 722-06610-16
1 Metrotech Center North
Brooklyn, New York  11201-3859
 
Class D
- -------
PIMCO Advisors L.P.                                   10,358.661      100.00%*
Attention: Vinh Nguyen
800 Newport Center Drive
Newport Beach, California  92660-6309
 
PIMCO Total Return Fund
 
Institutional
- -------------
Charles Schwab & Co., Inc. Rein                   96,537,570.349        5.59%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Administrative
- --------------
Certain Employee (Fidelity) **                    19,470,444.276       32.48%*
100 Magellan KW1C
Covington, Kentucky  41015
 
American Express Trust Company **                  9,332,082.759       15.57%
N10/996
P. O. Box 534
Minneapolis, Minnesota  55440-0534
 
National Financial Services Corporation **         6,580,147.665       10.97%
1 World Financial Center
200  Liberty Street
New York, New York 10281
 
New York Life Trust Company                        3,872,232.975        6.46%
51 Madison Avenue, Room 117A
New York, New York  10010
</TABLE>      

                                       80
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                <C>             <C>
PIMCO Total Return Fund

Class A
- -------
MLPF&S For the Sole Benefit of its Customers **    31,815,489.390      51.41%*
Attention: Fund Administration
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
The Chase Manhattan Bank TR                         3,198,262.173       5.16%
McLane Co. Investment Savings Plan
770 Broadway Floor 10
New York, New York  10003-9522
 
Class B
- -------
MLPF&S For the Sole Benefit of its Customers **     8,190,845.170      36.71%*
Attention: Fund Administration #97M35
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
Class C
- -------
MLPF&S For the Sole Benefit of its Customers **    11,410,434.194      27.34%*
Attention: Fund Administration
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
Class D
- -------
PIMCO Advisors L.P.                                     9,856.335      99.99%*
Attention: Vinh Nguyen
800 Newport Center Drive
Newport Beach, California  92660-6309
 
PIMCO Total Return Fund II
 
Institutional
- -------------
John Muir/Mt. Diablo Health System                 10,313,048.462      14.84%
1400 Treat Boulevard
Walnut Creek, California  94598
 
IUE AFL-CIO Pension Plan                            6,491,728.128       9.34%
1460 Broad Street
Blommfield, New Jersey  07003
 
Charles Schwab & Co., Inc. Rein                     5,767,479.393       8.29%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
The Trustee of GMP Employee Pension                 5,655,607.378       8.13%
1100 Fifth & Race Tower
Cincinnati, Ohio  45202
</TABLE>      

                                       81
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                <C>             <C>
PIMCO Total Return Fund II
 
Institutional
- -------------
Macmillan Bloedel Pension Plan                     5,252,765.877        7.55%
c/o State Street Bank and Trust Co.                                 
200 Newport Avenue #JQ7                                             
North Quincy, Massachusetts  02171                                  
                                                                    
Morley Capital Management                          3,488,036.136        5.01%
5665 SW Meadows Road, Suite 400                                     
Lake Oswego, Oregon 97035                                           
                                                                    
Administrative                                                      
- --------------                                                      
Datalynx #083 (Hunt, Dupree, Rhine) **               400,295.262        8.43%
P. O. Box 173736                                                    
Denver, Colorado  80217-3736                                        
                                                                    
PIMCO Total Return Fund III                                         
                                                                    
Institutional                                                       
- -------------                                                       
Archdiocese of LA/Corp/Diocese Tucson              8,958,297.469       22.49%
3424 Wilshire Boulevard, 10th Floor                                 
Los Angeles, California  90010-2241                                 
                                                                    
Holy Cross                                         4,700,816.385       11.80%
St. Mary's Lourdes Hall                                             
Notre Dame, Indiana  46556                                          
                                                                    
Diocese of Orange                                  3,007,268.693        7.55%
2811 East Villa Road                                                
Orange, California  92667                                           
                                                                    
Baptist Health System, Inc.                        2,522,528.555        6.33%
2811 East Villa Road                                                
Orange, California  92667                                           
                                                                    
Society of Mount Carmel                            2,234,807.314        5.61%
1317 Frontage Road                                                  
Darien, Illinois  60561                                             
                                                                    
Archdiocese of LA Lay Plan/Diocese Tucson          2,134,754.930        5.36%
3424 Wilshire Boulevard                                             
Los Angeles, California  90010-2241                                 
                                                                    
The Papal Foundation                               2,004,245.364        5.03%
222 North 17th Street
Philadelphia, Pennsylvania  19103
</TABLE>      

                                       82
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                <C>             <C>
PIMCO Total Return Fund III

Administrative
- --------------
Lumpkin Foundation (PaineWebber)                      156,829.879      88.29%*
P. O. Box 1097
Mattoon, Illinois  61938
 
Dubuque Bank & Trust Co. **                            16,328.152       9.19%
Attention:  Trust Department
Dubuque, Iowa  5200-0747
 
PIMCO Total Return Mortgage Fund
 
Institutional
- -------------
Charles Schwab & Co., Inc. Rein                         4,999.359      76.17%*
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
John A. Towsley, IRA                                    1,564.262      23.83%
4281 Climbing Way
Ann Arbor, Michigan  48103
 
PIMCO High Yield Fund
 
Institutional
- -------------
Charles Schwab & Co., Inc. Rein                    19,989,631.878      12.53%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Administrative
- --------------
National Financial Services Corporation **          4,815,245.466      54.98%*
1 World Financial Center
200  Liberty Street
New York, New York 10281
 
Certain Employee (Fidelity) **                      1,553,047.298      19.18%
100 Magellan KW1C
Covington, Kentucky  41015
 
American Bankers Insurance Co.                        434,782.609       5.37%
P. O. Box 979004
Miami, Florida  33197-9004
 
American Bankers Life Assurance of Florida            430,663.221       5.32%
P. O. Box 979004
Miami, Florida  33197-9004
</TABLE>      

                                       83
<PAGE>
 
<TABLE>     
<CAPTION>
                                                       Shares      Percentage of
                                                    Beneficially    Outstanding
                                                       Owned       Shares Owned
                                                    ------------   -------------
<S>                                                <C>             <C>
PIMCO High Yield Fund

Class A
- -------
MLPF&S For the Sole Benefit of its Customers **    1,639,938.377       25.03%*
Attention: Fund Administration #97M35                              
4800 Deer Lake Drive E. Floor 3                                    
Jacksonville, Florida 32246-6484                                   
                                                                   
Class B                                                            
- -------                                                            
MLPF&S For the Sole Benefit of its Customers **    4,633,130.265       29.76%*
Attention: Fund Administration #97M35                              
4800 Deer Lake Drive E. Floor 3                                    
Jacksonville, Florida 32246-6484                                   
                                                                   
Class C                                                            
- -------                                                            
MLPF&S For the Sole Benefit of its Customers **    4,307,502.151       17.12%
Attention: Fund Administration #97M36                              
4800 Deer Lake Drive E. Floor 3                                    
Jacksonville, Florida 32246-6484                                   
                                                                   
Class D                                                            
- -------                                                            
Charles Schwab & Co., Inc.                            23,887.965       73.25%*
Special Custody Accounts                                           
FBO Customers                                                      
Attention: Mutual Funds                                            
101 Montgomery Street                                              
San Francisco, California  94104-4122                              
                                                                   
PIMCO Advisors L.P.                                    8,721.871       26.74%*
Attention: Vinh Nguyen                                             
800 Newport Center Drive                                           
Newport Beach, California  92660-6309                              
                                                                   
PIMCO Long-Term U.S. Government Fund                               
                                                                   
Institutional                                                      
- -------------                                                      
Allianz Defined Contribution Plan                  1,454,974.884       20.14%
P. O. Box 92956                                                    
Chicago, Illinois  60675                                           
                                                                   
Chicato Symphony Orchestra                         1,367,146.789       19.04%
220 South Michigan Avenue                                          
Chicago, Illinois  60604                                           
                                                                   
Charles Schwab & Co., Inc. Rein                    1,007,486.419       13.94%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
</TABLE>      

                                       84
<PAGE>
<TABLE>     
<CAPTION> 
 
                                                           Shares         Percentage of
                                                        Beneficially      Outstanding
                                                           Owned          Shares Owned
                                                           -----          ------------
PIMCO Long-Term U.S. Government Fund
 
Institutional
- -------------
<S>                                                 <C>                      <C>
Society of the Holy Child Jesus Retirement               847,031.964         11.72%
P. O. Box 34480
West Bethesda, Maryland  20827-0480
 
Society of the Holy Child Jesus                          474,885.845          6.57%
P. O. Box 34480
West Bethesda, Maryland  20827-0480
 
Source One                                               454,069.293          6.28%
P. O. Box 92956
Chicago, Illinois  60675
 
DLJ Securities Corporation, Inc. **                      423,283.469          5.85%
Securities Corporation Inc.
P. O. Box 2052
Jersey City, New Jersey  07303-9998
 
Administrative
- --------------
Sealed Air P/S Plan (Met Life)                           302,678.275         80.69%*   
100 Plaza One MS 3064                                                             
Jersey City, New Jersey                                                           
                                                                                  
New York Life Trust Company **                            71,617.825         19.09%  
51 Madison Avenue, Room 117A                                                      
New York, New York  10010                                                         
                                                                                  
Class A                                                                           
- -------
MLPF&S For the Sole Benefit of its Customers **           73,061.588          8.81%  
Attention: Fund Administration #97MY2                                             
4800 Deer Lake Drive E. Floor 3                                                   
Jacksonville, Florida 32246-6484                                                  
                                                                                  
Painewebber for the Benefit of                            64,782.943          7.82%   
Lokahi Pacific
Investment Account
840 Alua Street #203
Wailuku, Hawaii  96793-1482

Class B
- -------
MLPF&S For the Sole Benefit of its Customers **          245,068.828         19.97%
Attention: Fund Administration #97M35
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
</TABLE>      

                                       85
<PAGE>

<TABLE>     
<CAPTION> 
 
                                                         Shares  Percentage of
                                                   Beneficially    Outstanding
                                                          Owned   Shares Owned
                                                          -----   ------------
<S>                                                <C>           <C>
PIMCO Long-Term U.S. Government Fund

Class C
- -------
MLPF&S For the Sole Benefit of its Customers **     256,919.777          29.61%*
Attention: Fund Administration #97M36
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
PIMCO Global Bond Fund
 
Institutional
- -------------
Georgetown University                             2,922,797.270          10.76%
3600 M. Street, NW
Washington DC  20007
 
Walker Art Center, Inc.                           2,829,916.185          10.42%
Vineland Place
Minneapolis, Minnesota  55403
 
Kamehameha Schools                                2,145,293.312           7.90%
P. O. Box 3466
Honolulu, Hawaii  96801
 
University of Denver (Colorado Seminary)          2,035,943.165           7.50%
2199 South University Blvd.
Denver, Colorado  80208
 
Hobart and William Smith Colleges                 1,938,692.469           7.14%
337 Pulteney Street
Geneva, New York  14456
 
Worcester Polytechnic                             1,625,697.320           5.98%
100 Institute Road
Worcester, Massachusetts  01609
 
Sunkist Master Trust                              1,500,080.195           5.52%
14130 Riverside Drive
Sherman Oaks, California  91423
 
Chase Manhattan Bank as Trustee for               1,370,119.316           5.04%
Redland North America Retirement Plan
770 Broadway, 10th Floor
New York, New York  10003-9598
 
Administrative
- --------------
Certain Employee (Fidelity) **                       82,491.527          86.77%*
100 Magellan KW1C
Covington, Kentucky  41015
</TABLE>      

                                       86
<PAGE>
 
<TABLE>    
<CAPTION> 
 
                                                      Shares      Percentage of
                                                   Beneficially    Outstanding
                                                      Owned        Shares Owned
                                                   ------------   -------------
<S>                                                <C>            <C>
PIMCO Global Bond Fund

Administrative
- --------------
Stockton Trust Nominee Partnership **                12,562.457          13.21%
c/o Stockton Trust, Inc.
3001 East Camelback Road, Suite 100
Phoenix, Arizona  85016
 
PIMCO Global Bond Fund II
 
Institutional
- -------------
Canterbury/Uniform Code Council                   1,712,973.491          64.38%*
Mutual Funds Operations
Pittsburgh, Pennsylvania  15230-3198
 
GMP & Employers Retiree Trust                       846,511.466          31.81%*
MIDF965N032
Mutual Funds Operations
Pittsburgh, Pennsylvania  15230-3198
 
Class A
- -------
Central Fidelity National Bank                      229,140.644          35.90%*
FBO OBICI Foundation
Attention: Mutual Funds Desk, 5th Floor
P. O. Box 27602
Richmond, Virginia  23261-7602
 
DLJ Securities Corporation, Inc. **                  52,009.795           8.14%
Securities Corporation Inc.
P. O. Box 2052
Jersey City, New Jersey  07303-9998
 
MLPF&S For the Sole Benefit of its Customers **      40,415.666           6.33%
Attention: Fund Administration #97RD3
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
Class B
- -------
MLPF&S For the Sole Benefit of its Customers **     136,655.359          28.74%*
Attention: Fund Administration #97M36
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484

Class C
- -------
MLPF&S For the Sole Benefit of its Customers **     125,967.730          20.88%
Attention: Fund Administration #97UU0
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
</TABLE>     

                                       87
<PAGE>

<TABLE>     
<CAPTION> 
                                                          Shares       Percentage of
                                                       Beneficially     Outstanding
                                                          Owned        Shares Owned
                                                       ------------    -------------
<S>                                                   <C>              <C>        
PIMCO Foreign Bond Fund                                                
                                                                       
Institutional                                                          
- -------------                                                          
Charles Schwab & Co., Inc. Rein                       22,019,778.388       53.07%*    
The Schwab Building                                                                   
101 Montgomery Street                                                                 
San Francisco, California  94104                                                      
                                                                                      
DLJ Securities Corporation, Inc. **                    9,395,182.671       22.64%   
Securities Corporation Inc.                                                           
P. O. Box 2052                                                                        
Jersey City, New Jersey  07303-9998                                                   
                                                                                      
Administrative                                                                        
- --------------                                                                        
CBNA FBO Clients of Benefit Plans                         79,523.397       71.18%*    
1500 Genesee  Street                                                                  
Utica, New York  13502                                                                
                                                                                      
National Financial Services Corporation **                32,189.428       28.81%*    
1 World Financial Center                                                              
200  Liberty Street                                                                   
New York, New York 10281                                                              
                                                                                      
Class A                                                                               
- -------                                                                               
Lewco Securities Corp.                                    99,477.955        7.22%   
FBO A/C H30-627865-6-01                                                               
34 Exchange Place 4th Floor                                                           
Jersey City, New Jersey  07311                                                        
                                                                                      
VERB & Co.                                                84,696.826        6.15%   
4380 SW MacAdam Avenue, Ste. 450                                                      
Portland, Oregon  97201-6407                                                          
                                                                                      
Class B                                                                               
- -------                                                                               
MLPF&S For the Sole Benefit of its Customers **          159,667.838       12.05%   
Attention: Fund Administration #97M35                                                 
4800 Deer Lake Drive E. Floor 3                                                       
Jacksonville, Florida 32246-6484                                                      
                                                                                      
Class C                                                                               
- -------                                                                               
MLPF&S For the Sole Benefit of its Customers **          160,363.117        8.14%   
Attention: Fund Administration #97M36
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
</TABLE>      

                                       88
<PAGE>

<TABLE>     
<CAPTION> 
 
                                                         Shares  Percentage of
                                                   Beneficially    Outstanding
                                                          Owned   Shares Owned
                                                          -----   ------------
<S>                                               <C>             <C>
PIMCO Foreign Bond Fund

Class D
- -------
Charles Schwab & Co., Inc.                          218,054.384          95.89%*
Special Custody Accounts
FBO Customers
Attention: Mutual Funds
101 Montgomery Street
San Francisco, California  94104-4122
 
PIMCO International Bond Fund
 
Institutional
- -------------
3M Company                                        4,527,398.891           6.21%
c/o Bostom State Deposit
1 Cabot Road  WT04G
Medford, Massachusetts  02155-5160
 
AT&T Master Trust                                 4,079,567.993           5.60%
P. O. Box 3198
Pittsburgh, Pennsylvania  15230-3197
 
PIMCO Emerging Markets Bond Fund
 
Institutional
- -------------
Charles Schwab & Co., Inc. Rein                      35,513.067          62.43%*
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Daphne Cunningham                                    15,944.429          28.03%*
1031 Judson Avenue
Evanston, Illinois  60202
 
Richard Gray                                          3,963.760           6.97%
Box 5024
Costa Mesa, California  92628-5024
 
Class A
- -------
MLPF&S For the Sole Benefit of its Customers **       9,067.000          31.82%*
Attention: Fund Administration #97RD2
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
RPSS TR ROLLOVER IRA                                  5,712.460          20.04%
FBO Glenda D. Stubbs
1503 Drop Tine Drive
Cedar Park, Texas  78613-4901
</TABLE>      

                                       89
<PAGE>
<TABLE>     
<CAPTION> 
                                                             Shares      Percentage of
                                                          Beneficially   Outstanding
                                                             Owned       Shares Owned
                                                             -----       ------------
PIMCO Emerging Markets Bond Fund

Class A
- -------
<S>                                                       <C>            <C>              
NFSC FEBO #0C8-760838                                       3,638.250      12.76%
NFSCFMTC IRA
FBO Wayne E. Smith Jr.
Box 104A                                                                            
Green Drive Road #3                                                                 
Greensburg, Pennsylvania  15601                                                     
                                                                                    
Steve M. Foulke &                                           2,231.682       7.83%   
Maria M. Foulke                                                                     
Community Property                                                                  
1 Altimira                                                                          
Coto de Caza, California  92679-4901                                                
                                                                                    
Patricia D. Rodilosso Cust.                                 2,084.584       7.31%   
FBO Christopher Adam Rodilosso                                                      
Unif GIFT MIN ACT NJ                                                                
9 River Edge Drive                                                                  
Rumson, New Jersey  07760-1025                                                      
                                                                                    
Thomas Rodilosso &                                          1,596.374       5.60%   
Patricia D. Rodilosso                                                               
Joint TEN WROS NOT TC                                                               
9 River Edge Drive                                                                  
Rumson, New Jersey  07760-1025                                                      
                                                                                    
Class B                                                                             
- -------                                                                             
RPSS TR IAA                                                 7,383.365      22.94%   
FBO Gregory D. McDonald                                                             
15618 Gettysburg Drive                                                              
Tomball, Texas  77375-8609                                                          
                                                                                    
MLPF&S For the Sole Benefit of its Customers **             6,567.000      20.41%   
Attention: Fund Administration #97RD3                                               
4800 Deer Lake Drive E. Floor 3                                                     
Jacksonville, Florida 32246-6484                                                    
                                                                                    
NFSC FEBO #ANR-092380                                       5,684.591      17.66%   
Cynthia S. Brannon                                                                  
8408 Quebe Road                                                                     
Brenham, Texas  77833                                                               
                                                                                    
Resources Trust Co. TR IRA                                  2,966.236       9.21%   
UA SEP 04 97
FBO Mike Miller
I-459-88-3192
P. O. Box 5900
Denver, Colorado  80217-5900
</TABLE>      

                                       90
<PAGE>

<TABLE>     
<CAPTION> 
 
                                                      Shares      Percentage of
                                                   Beneficially     Outstanding
                                                       Owned       Shares Owned
                                                       -----       ------------
<S>                                                <C>            <C>
PIMCO Emerging Markets Bond Fund
 
Class B
- -------
Gloria D. Postal                                      1,877.031           5.83%
State Road
Rockbridge, Illinois  62081
 
Class C
- -------
MLPF&S For the Sole Benefit of its Customers **      10,362.184          41.10%*
Attention: Fund Administration #97M36
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
NFSC FEBO #0C8-078107                                 5,051.778          20.04%
Bernard McGinley
Denise P. McGinley
445 Fort Pitt Blvd.
Pittsburgh, Pennsylvania  15219
 
NFSC FEBO #120-077852                                 4,810.115          19.08%
FMT CO CUST IRA
FBO John J. Jordan
P. O. Box 466
Rye Beach, New Hampshire  03871
 
PIMCO Emerging Markets Bond Fund II
 
Institutional
- -------------
IBM Retirement Plan Enh Cash Portfolio            2,569,170.324          38.72%*
Global Securities Services
3 Chase Metrotech Center
7th Floor, Brooklyn, New York  11245
 
Nebraska Public Employees Retirement System         815,144.390          12.28%
P. O. Box 1992
Boston, Massachusetts  02105-1992
 
Olin Corporation                                    735,799.276          11.09%
c/o BT Services Tennessee, Inc.
648 Grassemere Business Park Road
Advisors Services Group, 2nd Floor
Nashville, Tennessee  37211
 
Midwest Operating Engineers                         668,689.320          10.07%
P. O. Box 92923
Chicago, Illinois  60675
 
GTE Services Corp.                                  611,058.309           9.21%
c/o BT Services Tennessee, Inc.
648 Grassemere Business Park Road
Advisors Services Group, 2nd Floor
Nashville, Tennessee  37211
</TABLE>      

                                       91
<PAGE>
<TABLE>
<CAPTION> 
                                                              Shares         Percentage of
                                                           Beneficially       Outstanding
                                                               Owned          Shares Owned
                                                           ------------      -------------
<S>                                                        <C>               <C>
PIMCO Emerging Markets Bond Fund II

Institutional
- -------------
The Robert Wood Johnson Foundation                           350,350.350        5.28%
Master Trust Services Division
P. O. Box 1992
Boston, Massachusetts  02105-1992
 
PIMCO Municipal Bond Fund
 
Institutional
- -------------
MediaOne VEBA Trust                                           69,790.628      100.00%*      
188 Inverness Drive West                                                                  
Englewood, Colorado  80112                                                                
                                                                                          
Class A                                                                                   
- -------                                                                                   
Nationsbanc Montgomery Securities                            199,109.964       26.38%*    
810-10433-16                                                                              
Attention: Mutual Funds - 4th Floor                                                       
600 Montgomery Street                                                                     
San Francisco, California 94111                                                           
                                                                                          
MLPF&S For the Sole Benefit of its Customers **              162,228.575       21.50%   
Attention: Fund Administration #97RD3                                                     
4800 Deer Lake Drive E. Floor 3                                                           
Jacksonville, Florida 32246-6484                                                          
                                                                                          
Nationsbanc Montgomery Securities                             84,244.938       11.16%   
712-02020-10                                                                              
Attention: Mutual Funds - 4th Floor                                                       
600 Montgomery Street                                                                     
San Francisco, California 94111                                                           
                                                                                          
Joseph R White                                                41,198.217        5.46%   
P. O. Box 572                                                                             
Waltham, Massachusetts 02254-0572                                                         
                                                                                          
Class B                                                                                   
- -------                                                                                   
MLPF&S For the Sole Benefit of its Customers **               79,956.165       18.12%   
Attention: Fund Administration #97M36                                                     
4800 Deer Lake Drive E. Floor 3                                                           
Jacksonville, Florida 32246-6484                                                          
                                                                                          
Dain Rauscher Incorporated FBO                                66,529.644       15.66%    
K. K. Kinsey Trustee
K. K. Kinsey Rev Intervivos TR
UA DTD 04-18-1997
2801 NE 14th Street
Ft. Lauderdale, Florida  33304
</TABLE>
                                       92
<PAGE>
 
<TABLE>     
<CAPTION> 
                                                Shares            Percentage of
                                             Beneficially          Outstanding
                                                Owned             Shares Owned
                                             ------------         -------------
<S>                                          <C>                  <C> 
PIMCO Municipal Bond Fund
 
Class B
- -------
Prudential Securities Inc. FBO                  60,422.204              14.22%
Ruth G. Battel                                                      
6 Willowbank Ct.                                                    
Mahwah, New Jersey  07430-2909                                      
                                                                    
Painewebber for the Benefit of                  22,111.389               5.20%
William H. Hoehn                                                    
2906 SW 130th Terrace                                               
Archer, Florida  32618-2124                                         
                                                                    
Robert A. Fish &                                21,950.565               5.16%
Susan Beville Fish CONTRS                                           
UA MAR 01 94                                                        
The Fish Family Trust                                               
300 Tolak Road                                                      
Aptos, California  95003-2737                                       
                                                                    
Class C                                                             
- -------
MLPF&S For the Sole Benefit of its Customers** 419,687.546              11.59%
Attention: Fund Administration #97UU0                               
4800 Deer Lake Drive E. Floor 3                                     
Jacksonville, Florida 32246-6484                                    
                                                                    
Class D                                                             
- -------
PIMCO Advisors L.P.                             10,107.714              99.99%*
Attention: Vinh Nguyen                                              
800 Newport Center Drive                                            
Newport Beach, California  92660-6309                               
                                                                    
PIMCO Strategic Balance Fund                                        
                                                                    
Institutional                                                       
- -------------
California Community Foundation              2,452,383.165              79.44%*
606 South Olive Street, Suite 2400                                  
Los Angeles, California  90014                                      
                                                                    
Pacific Asset Management LLC                   569,336.779              18.44%
700 Newport Center Drive                                            
Newport Beach, California  92660-6307                               
                                                                    
Class D                                                             
- -------
PIMCO Advisors L.P.                              7,969.702             100.00%*
Attention: Vinh Nguyen
800 Newport Center Drive
Newport Beach, California  92660-6309
</TABLE>      

                                       93
<PAGE>

<TABLE>     
<CAPTION> 
 
                                                     Shares       Percentage of
                                                  Beneficially     Outstanding
                                                     Owned        Shares Owned
                                                  ------------    ------------
<S>                                               <C>             <C>
PIMCO StocksPLUS Fund
 
Institutional
- -------------
Charles Schwab & Co., Inc. Rein                   4,207,723.548          14.43%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Iowa Methodist                                    2,319,484.564           7.95%
1200 Pleasant Street
Des Moines, Iowa  50309
 
St. Benedict Retirement Plan Trust                2,363,008.804           8.10%
P. O. Box 64010
St. Paul, Minnesota  55164-0010
 
Administrative
- --------------
New York Life Trust Company                          76,280.006          45.91%*
51 Madison Avenue, Room 117A
New York, New York  10010
 
National Financial Services Corporation **           53,367.548          32.12%*
1 World Financial Center
200  Liberty Street
New York, New York 10281
 
Public Service of New Mexico #90701                  25,710.933          15.47%
The Vanguard Group
P. O. Box 2600 VM 421
Valley Forge, Pennsylvania  19482
 
DLJ Securities Corporation, Inc. **                  10,780.095           6.48%
P. O. Box 2052
Jersey City, New Jersey  07303-9998
 
Class A
- -------
MLPF&S For the Sole Benefit of its Customers **     563,844.299          10.32%
Attention: Fund Administration #97M34
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
FTC & Co. **                                        531,564.242           9.73%
P. O. Box 173736
Denver, Colorado  80217-3736
 
Class B
- -------
MLPF&S For the Sole Benefit of its Customers **   1,247,429.995          13.64%
Attention: Fund Administration #97M35
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
</TABLE>      

                                       94
<PAGE>

<TABLE>     
<CAPTION> 
 
                                                         Shares     Percentage of
                                                   Beneficially      Outstanding
                                                          Owned     Shares Owned
                                                          -----     ------------
<S>                                                 <C>             <C>
PIMCO StocksPLUS Fund

Class C
- -------
MLPF&S For the Sole Benefit of its Customers **     977,191.882          11.58%
Attention: Fund Administration #97M36
4800 Deer Lake Drive E. Floor 3
Jacksonville, Florida 32246-6484
 
Class D
- -------
PIMCO Advisors L.P.                                   7,133.270          56.43%*
Attention: Vinh Nguyen
800 Newport Center Drive
Newport Beach, California  92660-6309
 
Charles Schwab & Co., Inc.                            5,506.283          43.56%*
Special Custody Accounts
FBO Customers
Attention: Mutual Funds
101 Montgomery Street
San Francisco, California  94104-4122
</TABLE>      

    
*    Entity owned 25% or more of the outstanding shares of beneficial interest
of the Fund, and therefore may be presumed to "control" the Fund, as that term
is defined in the 1940 Act.      
    
**   Shares are believed to be held only as nominee.      


The Reorganization of the PIMCO Money Market and Total Return II Funds

     On November 1, 1995, the Money Market Fund and the PIMCO Managed Bond and
Income Fund, two former series of PIMCO Funds:  Equity Advisors Series, were
reorganized as series of the Trust, and were renamed PIMCO Money Market Fund and
PIMCO Total Return Fund II, respectively.  All information presented for these
Funds prior to this date represents their operational history as series of PIMCO
Funds:  Equity Advisors Series.  In connection with the Reorganization, the
Funds changed their fiscal year end from October 31 to March 31.

The Reorganization of the PIMCO Global Bond Fund II

     On January 17, 1997, the Global Income Fund, a former series of PIMCO
Advisors Funds, was reorganized as a series of the Trust, and was renamed the
PIMCO Global Bond Fund II.  All information presented for this Fund prior to
that date represents its operational history as a series of PIMCO Advisors
Funds.  In connection with the Reorganization, the Fund changed its fiscal year
end from September 30 to March 31.

Code of Ethics

     The Trust and PIMCO have each adopted a Code of Ethics governing personal
trading activities of all Trustees and officers of the Trust, and Directors,
officers and employees of PIMCO who, in connection 

                                       95
<PAGE>
 
with their regular functions, play a role in the recommendation of any purchase
or sale of a security by the Trust or obtain information pertaining to such
purchase or sale or who have the power to influence the management or policies
of the Trust or PIMCO. Such persons are prohibited from effecting certain
transactions, allowed to effect certain exempt transactions, required to
preclear certain security transactions with PIMCO's Compliance Officer or his
designee and to report certain transactions on a regular basis. PIMCO has
developed procedures for administration of the Codes.

Custodian, Transfer Agent and Dividend Disbursing Agent

     Investors Fiduciary Trust Company ("IFTC") 801 Pennsylvania, Kansas City,
Missouri 64105 serves as custodian for assets of all Funds, and also serves as
transfer agent and dividend disbursing agent for the Institutional Class and
Administrative Class shares of the Funds.  Shareholder Services, Inc., P.O. Box
5866, Denver, Colorado 80217 serves as transfer agent and dividend disbursing
agent for the Class A, Class B, Class C and Class D shares of the Funds.
Pursuant to a sub-custody agreement between IFTC and State Street Bank and Trust
Company ("State Street"), State Street serves as subcustodian of the Trust for
the custody of the foreign securities acquired by those Funds that invest in
foreign securities.  Under the agreement, State Street may hold the foreign
securities at its principal office at 225 Franklin Street, Boston. Massachusetts
02110, and at State Street's branches, and subject to approval by the Board of
Trustees, at a foreign branch of a qualified U.S. bank, with an eligible foreign
subcustodian, or with an eligible foreign securities depository.

     Pursuant to rules adopted under the 1940 Act, the Trust may maintain
foreign securities and cash in the custody of certain eligible foreign banks and
securities depositories.  Selection of these foreign custodial institutions is
made by the Board of Trustees following a consideration of a number of factors,
including (but not limited to) the reliability and financial stability of the
institution; the ability of the institution to perform capably custodial
services for the Trust; the reputation of the institution in its national
market; the political and economic stability of the country in which the
institution is located; and further risks of potential nationalization or
expropriation of Trust assets.  The Board of Trustees reviews annually the
continuance of foreign custodial arrangements for the Trust.  No assurance can
be given that the Trustees' appraisal of the risks in connection with foreign
custodial arrangements will always be correct or that expropriation,
nationalization, freezes, or confiscation of assets that would impact assets of
the Funds will not occur, and shareholders bear the risk of losses arising from
these or other events.

Independent Accountants
    
     PricewaterhouseCoopers LLP (formerly Price Waterhouse LLP), 1055 Broadway,
Kansas City, MO  64105, serves as independent public accountants for all Funds.
PricewaterhouseCoopers LLP provides audit services, tax return preparation and
assistance and consultation in connection with review of SEC filings.  Prior to
November 1, 1995, Deloitte & Touche LLP served as independent accountants for
the PIMCO Money Market and Total Return II Funds.  See "The Reorganization of
the PIMCO Money Market and Total Return II Funds" for additional information.
     
Counsel

     Dechert Price & Rhoads, 1775 Eye Street, N.W., Washington, D.C. 20006,
passes upon certain legal matters in connection with the shares offered by the
Trust, and also act as counsel to the Trust.

Registration Statement

     This Statement of Additional Information and the Prospectuses do not
contain all of the information included in the Trust's registration statement
filed with the SEC under the 1933 Act with respect to the securities offered
hereby, certain portions of which have been omitted pursuant to the rules and
regulations of the SEC.  The registration statement, including the exhibits
filed therewith, may be examined at the offices of the SEC in Washington, D.C.

                                       96
<PAGE>
 
     Statements contained herein and in the Prospectuses as to the contents of
any contract or other documents referred to are not necessarily complete, and,
in each instance, reference is made to the copy of such contract or other
documents filed as an exhibit to the registration statement, each such statement
being qualified in all respects by such reference.

Financial Statements
   
     Financial statements for the Trust as of March 31, 1998 for its fiscal year
then ended, including notes thereto, and the reports of PricewaterhouseCoopers
LLP (formerly Price Waterhouse LLP) thereon dated May 22, 1998, are incorporated
by reference from the Trust's 1998 Annual Report.  A copy of the Reports
delivered with this Statement of Additional Information should be retained for
future reference. Financial statements for the PIMCO Municipal Bond Fund as of
March 31, 1998, including notes thereto, and the report of Price Waterhouse
thereon dated May 22, 1998, are included herein.     

                                       97
<PAGE>
 
                       Report of Independent Accountants
    
May 22, 1998      
    
To the Board of Trustees and
Shareholders of the PIMCO Funds      
    
In our opinion, the accompanying statement of assets and liabilities, including
the schedule of investments, and the related statements of income, changes in
net assets and the financial highlights present fairly, in all material
respects, the financial position of the Municipal Bond Fund (the "Fund") at
March 31, 1998, and the results of its operations, the changes in its net assets
and the financial highlights for the period January 2, 1998 (commencement of
operations) through March 31, 1998, in conformity with generally accepted
accounting principles.  These financial statements and the financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Fund's management; our responsibility is to express an opinion on these
financial statements based on our audit.  We conducted our audit of these
statements in accordance with generally accepted auditing standards which
require that we plan and perform the audit to obtain reasonable assurance about
whether the financial statements are free of material misstatement.  An audit
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation.  We believe that our audit, which included
confirmation of securities at March 31, 1998 by correspondence with the
custodian and brokers, provides a reasonable basis for the opinion expressed
above.      

<PAGE>
                                       
                                  PIMCO FUNDS
                              MUNICIPAL BOND FUND
                       STATEMENT OF ASSETS & LIABILITIES
                                 March 31, 1998      

<TABLE>    
<CAPTION>
<S>                                                                 <C> 
ASSETS:
   Investments at value (cost $2,942,244)                            $2,933,369
   Cash                                                                     149
   Receivable for securities sold                                       148,896
   Interest receivable                                                   40,932
                                                                     ----------
     Total Assets                                                     3,123,346
                                                                     ----------
 
LIABILITIES:
   Payable for investments purchased                                     98,734
   Accrued advisory fee                                                     639
   Accrued administration fee                                               639
   Other                                                                     31
                                                                     ----------
     Total Liabilities                                                  100,043
                                                                     ----------
 
NET ASSETS:                                                          $3,023,303
                                                                     ==========
 
   Net assets consist of:
     Paid-in capital                                                 $3,032,779
     Accumulated undistributed realized loss                               (560)
     Distributions in excess of net investment income prior years           (41)
     Unrealized depreciation                                             (8,875)
                                                                     ----------
   Net assets                                                        $3,023,303
                                                                     ==========
 
   Net asset value per share* (303,272 shares outstanding)           $     9.97
                                                                     ==========
</TABLE>      
    
   *Offering price.      

                       See Notes to Financial Statements
<PAGE>
<TABLE>     
<CAPTION>  
                                  PIMCO FUNDS
                              MUNICIPAL BOND FUND
                            STATEMENT OF OPERATIONS
             FOR THE PERIOD JANUARY 2, 1998* THROUGH MARCH 31, 1998
<S>                                                                 <C>       
INTEREST INCOME:                                                     $36,345  
                                                                              
EXPENSES                                                                      
   Advisory fees                                                       1,800  
   Administration fees                                                 1,800  
   Trustees' fee                                                           7  
                                                                     -------
     Total expenses                                                    3,607  
                                                                     -------
NET INVESTMENT INCOME                                                 32,738  
                                                                     -------  
                                                                              
NET REALIZED AND UNREALIZED LOSS:                                             
   Net realized loss on investments                                     (560) 
   Net unrealized depreciation on investments                         (8,875) 
                                                                      ------
     Net loss                                                         (9,435) 
                                                                      ------  
                                                                              
                                                                     -------
NET INCREASE IN ASSETS RESULTING FROM OPERATIONS                     $23,303  
                                                                     ======= 
 
 
* COMMENCEMENT OF OPERATIONS
</TABLE>      

                       See Notes to Financial Statements

<PAGE>
                                      
                                  PIMCO FUNDS
                              MUNICIPAL BOND FUND
                       STATEMENT OF CHANGES IN NET ASSETS
             FOR THE PERIOD JANUARY 2, 1998* THROUGH MARCH 31, 1998      

<TABLE>     
<S>                                                                  <C>
INCREASE IN NET ASSETS FROM:                                        
Operations:                                                         
   Net investment income                                             $   32,738
   Net realized loss on investments                                        (560)
   Net unrealized depreciation on investments                            (8,875)
                                                                     ----------
     Net increase (decrease) resulting from operations                   23,303
                                                                     ----------
                                                                    
DISTRIBUTIONS TO SHAREHOLDER:                                       
   Net investment income                                                (32,780)
                                                                    
FUND SHARE TRANSACTIONS:                                            
   Receipts for shares sold                                           3,000,000
   Issued as reinvestment of distributions                               32,780
                                                                     ----------
     Net increase from fund share transactions                        3,032,780
                                                                     ----------
                                                                    
TOTAL INCREASE IN NET ASSETS                                         $3,023,303
                                                                     ==========
                                                                    
NET ASSETS:                                                         
   Beginning of period                                               $
                                                                     ----------
   End of period**                                                   $3,023,303
                                                                     ----------
                                                                    
   **Including net undistributed (overdistributed) investment        
     income of:                                                      $      (41)
                                                                     ----------
</TABLE>      

    
*Commencement of operations.      


                       See Notes to Financial Statements
<PAGE>
                                       
                                  PIMCO FUNDS
                              MUNICIPAL BOND FUND
                              FINANCIAL HIGHLIGHTS
             FOR THE PERIOD JANUARY 2, 1998* THROUGH MARCH 31, 1998      

<TABLE>     
<CAPTION> 
<S>                                                             <C>
Net Asset Value at Beginning of Period                          $10.00
   Net investment income                                          0.11
   Net realized/unrealized loss on investments                   (0.03)
                                                                ------
     Total income from operations                                 0.08
                                                                ------
 
Dividends from net investment income                             (0.11)
                                                                ------
                                                                ------
NET Asset Value at End of Period                                  9.97
                                                                ------
 
 
Total Return                                                      0.77%
 
Ratio of expenses to net average assets**                         0.50%
 
Ratio of net investment income to average net assets**            4.46%
 
Portfolio turnover rate                                          60.41%
</TABLE>      
 
     
*Commencement of operations.
**Annualized.      

                       See Notes to Financial Statements
<PAGE>

PIMCO FUNDS
Municipal Bond Fund
Notes to Financial Statements - March 31, 1998
- --------------------------------------------------------------------------------
     
1. Organization      
    
   PIMCO Funds (the "Trust") was established as a Massachusetts business trust
   on February 19, 1987. The Trust is registered under the Investment Company
   Act of 1940 (the "Act"), as amended, as an open-end investment management
   company. The Trust currently consists of twenty-five separate investment
   funds. Information presented in these financial statements pertains only to
   the Municipal Bond Fund (the "Fund"). The Fund commenced operation on January
   2, 1998. The Fund seeks high current income exempt from federal income tax,
   consistent with the preservation of capital. The Fund is authorized to offer
   six classes of shares. As of March 31, 1998 the Fund has only one class of
   shares outstanding; the Institutional Class.      

2. Significant Accounting Policies

   The following is a summary of significant accounting policies consistently
   followed by the Fund in preparation of its financial statements. These
   policies are in conformity with generally accepted accounting principles.
    
   Security Valuation.  Portfolio securities and other financial instruments for
   which market quotations are stated at market value. Market value is
   determined on the basis of last reported sales prices, or if no sales are
   reported, as is the case for most securities traded over-the-counter, the
   mean between representative bid and asked quotations obtained from a
   quotation reporting system or from established market markers. Fixed income
   securities, including those to be purchased under firm commitment agreements,
   are normally valued on the basis of quotes obtained from brokers and dealers
   or pricing services. Short-term investments which mature in 60 days or less
   are valued at amortized cost, which approximates market value. Certain fixed
   income securities for which daily market quotations are not readily available
   may be valued, pursuant to guidelines established by the Board of Trustees,
   with reference to fixed income securities whose prices are more readily
   obtainable.      

   Securities Transactions and Investment Income.  Securities transactions are
   recorded as of the trade date. Realized gains and losses from securities sold
   are recorded on the identified cost basis. Interest income is recorded on the
   accrual basis commencing on the settlement date of the transaction, and
   includes the accretion of discounts and amortization of premiums.

   Dividends and Distributions to Shareholders.  Dividends from net investment
   income of the Fund, are declared on each day the Trust is open for business
   and are distributed to shareholders monthly.

   Income distributions and capital gain distributions are determined in
   accordance with income tax regulations which may differ from generally
   accepted accounting principles.  These 

<PAGE>

PIMCO FUNDS
Municipal Bond Fund
Notes to Financial Statements - March 31, 1998
- --------------------------------------------------------------------------------
 
   differences are primarily due to differing treatments for such items as wash
   sales, net operating losses and capital loss carryforwards.

   Federal Income Taxes.  The Fund intends to qualify as a regulated investment
   company and distribute all of its taxable income and net realized gains, if
   applicable, to shareholders.  Accordingly, no provision for federal income
   taxes has been made.

   Estimates.  The preparation of financial statements in accordance with
   generally accepted accounting principles requires management to make
   estimates and assumptions that affect the reported amounts and disclosures in
   the financial statements.  Actual results could differ from those estimates.

3. Fees, Expenses, and Related Party Transactions
    
   Investment Advisory Fee.  Pacific Investment Management Company ("PIMCO")
   serves as investment adviser (the "Adviser") to the Fund, pursuant to an
   investment advisory contract.  The Adviser receives a monthly fee based on
   average daily net assets of the Fund at an annual rate of 0.25% from the
   Fund.      
    
   Administration Fee.  PIMCO also serves as administrator (the
   "Administrator"), and provides administrative services to the Fund for which
   it receives a monthly fee based on average daily net assets of the Fund at an
   annual rate of 0.25% from the Fund.      

   Other Expenses.  The Fund is responsible for certain other expenses:  (i)
   salaries and other compensation of any of the Trust's executive officers and
   employees who are not officers, directors, stockholders or employees of PIMCO
   or its subsidiaries or affiliates; (ii) taxes and governmental fees; (iii)
   brokerage fees and commissions and other portfolio transaction expenses; (iv)
   the costs of borrowing money, including interest expenses; (v) fees and
   expenses of the Trustees who are not "interested persons" of PIMCO or the
   Trust, and any counsel retained exclusively for their benefit; (vi)
   extraordinary expenses, including costs of litigation and indemnification
   expenses; (vii) expenses, such as organizational expenses, which are
   capitalized in accordance with generally accepted accounting principles; and
   (viii) any expenses allocated or allocable to a specific class of shares,
   which may include certain other expenses as permitted by the Trust's Multi-
   Class Plan adopted pursuant to Rule 18f-3 under the 1940 Act and subject to
   review and approval by the Trustees.
    
4. Purchases and Sales of Securities      
    
   The aggregate cost of purchases and proceeds from the sales of securities,
   excluding short-term securities, for the period ended March 31, 1998 were
   $4,716,478 and $1,779,140, respectively.      

<PAGE>
PIMCO FUNDS
Municipal Bond Fund
Notes to Financial Statements - March 31, 1998
_______________________________________________________________________________
     
5.  Shares of Beneficial Interest      
    
    As of March 31, 1998, the Fund has 303,272 Institutional Class shares
    outstanding, all of which are owned by PIMCO. Activity during the period was
    as follows:      

<TABLE>     
          <S>                                      <C>
          Shares sold                              300,000
          Issued as reinvestment of dividends        3,272
          Redeemed                                      --
                                                   -------
          Net Increase                             303,272
                                                   -------
</TABLE>      

<PAGE>
PIMCO FUNDS
Municipal Bond Fund
Schedule of Investments - March 31, 1998
_______________________________________________________________________________

<TABLE>     
<CAPTION>
                                                               Maturity                     Principal
Security                                                         Date          Rate           Amount         Value 
- --------------------------------------------------------------------------------------------------------------------
<S>                                                            <C>             <C>            <C>          <C> 
MUNICIPAL BONDS AND NOTES (96.83%)
 Alabama                4.86%
   Huntsville HLTH SER A                                        6/01/2017      5.000%         150,000      $ 146,813
                                                                                                           ---------
                                                                                                             146,813
                                                                                                           ---------

 Arizona                4.95%
   PIMA County, Arizona Community College District              7/01/2016      5.000%         150,000        149,625
                                                                                                           ---------
                                                                                                             149,625
                                                                                                           ---------

 California             8.25%
   Los Angeles County Metropolitan Transportation Authority     7/01/2018      4.750%         150,000        141,563  
   Southern California Public Power Authority                   7/01/2005      5.500%         100,000        107,750
                                                                                                           ---------
                                                                                                             249,313
                                                                                                           ---------

 Colorado               4.79%
   E-470 Public Highway Authority Colorado Redevelopment        9/01/2026      5.000%         150,000        144,938
                                                                                                           ---------
                                                                                                             144,938
                                                                                                           ---------

 District of Columbia   4.90%
   District of Columbia Revenue                                 2/01/2011      4.750%         150,000        148,125
                                                                                                           ---------
                                                                                                             148,125
                                                                                                           ---------

 Georgia                3.49%
   Dawson County School District                                4/01/2012      4.900%         105,000        105,656
                                                                                                           ---------
                                                                                                             105,656
                                                                                                           ---------

 Massachusetts          9.77%
   Massachusetts-CONS LN-SER C                                  8/01/2017      5.000%         150,000        146,625
   METHUEN (FGIC)                                              11/01/2016      5.000%         150,000        148,875
                                                                                                           ---------
                                                                                                             295,500
                                                                                                           ---------

 Michigan               3.29%
   Michigan State Building Authority Revenue Bonds             10/15/2014      5.000%         100,000         99,375
                                                                                                           ---------
                                                                                                              99,375
                                                                                                           ---------
</TABLE>      

                       See Notes to Financial Statements
<PAGE>

PIMCO FUNDS
Municipal Bond Fund
Schedule of Investments - March 31, 1998
________________________________________________________________________________

<TABLE>     
<CAPTION> 
                                                          Maturity             Principal
Security                                                    Date       Rate      Amount     Value
- --------                                                  --------     ----    ---------    -----
<S>                                                      <C>          <C>      <C>         <C> 
 Mississippi    4.96%                                                                        
    Mississippi State Dept. Corrections CTF               1/01/2008   4.600%    150,000    150,000
                                                                                           -------
                                                                                           150,000
                                                                                           -------
                                                                                           
 New Jersey     9.87%                                                                         
    New Jersey State Transportation TR FD                 6/15/2018   5.000%    150,000    147,750
                                                                                           
    Rutgers State University, New Jersey                  5/01/2011   4.800%    150,000    150,563
                                                                                           -------
                                                                                           298,313
                                                                                           
 New Mexico     4.94%                                                                         
    Bernalillo County, New Mexico                        12/01/2013   4.750%    150,000    149,250
                                                                                           -------
                                                                                           149,250
                                                                                           -------
                                                                                           
 New York       6.53%                                                                           
    New York Dorm-St. Clare Hosp B                        2/15/2009   4.900%    100,000     98,625
                                                                                           
    New York State Urban Development Corp.                1/01/2009   4.800%    100,000     98,875
                                                                                           -------
                                                                                           197,500
                                                                                           
 Ohio           3.34%                                                                               
    Ohio State PUB FACS COMMN                            11/01/1999   4.500%    100,000    101,125
                                                                                           -------
                                                                                           101,125
                                                                                           -------
                                                                                           
 Puerto Rico    4.92%                                                                        
    Puerto Rico Commonwealth Aqueduct & Sewer             7/01/2015   5.000%    150,000    148,875
                                                                                           -------
                                                                                           148,875
                                                                                           -------
                                                                                           
 Texas         14.70%                                                                             
    Beaumont, Texas Indpt Sch Dist                        2/15/2016   5.000%    150,000    147,938
                                                                                           
    Pflugerville, Texas Independent School District       8/15/2017   5.000%    150,000    146,813
                                                                                           
    Waco, Texas                                           2/01/2011   4.800%    150,000    149,810
                                                                                           -------
                                                                                           444,561
                                                                                           -------
</TABLE>      

                       See Notes to Financial Statements
<PAGE>

PIMCO FUNDS
Municipal Bond Fund
Schedule of Investments - March 31, 1998
- --------------------------------------------------------------------------------
<TABLE>     
<CAPTION> 
                                          Maturity          Principal
Security                                    Date     Rate    Amount      Value
================================================================================
<S>                                      <C>        <C>     <C>       <C>     
 Washington  3.27%
    King Hospital 1 REF AMBAC            9/01/2010  4.750%    100,000     98,500
                                                                      ----------
                                                                          98,500
                                                                      ----------

 Total Municipal Bonds and Notes 
  (Cost $2,936,344)                                                   $2,927,469
                                                                      ==========
 
 Short-Term Instruments  0.20%
    State Street Global Advisors 
     Tax Free Money Market*               4/1/1998  3.070%      5,900      5,900
                                                                      ----------
     (Cost $5,900)                                                         5,900
                                                                      ----------
 
 Total Investments (Total Costs:  
  $2,942,244)**                                                       $2,933,369
                                                                      ----------

 Other Assets and Liabilities (2.97%)                                     89,934
                                                                      ----------

 Net Assets (100%)                                                    $3,023,303
                                                                      ==========
 
 *  The 7 day annualized yield was 3.11% at March 31, 1998.
 
 ** At March 31, 1998, net unrealized depreciation for tax purposes was $8,875,
    which is comprised of gross appreciation of $5,776 and gross depreciation of
    $14,651.
</TABLE>      

                       See Notes to Financial Statements

<PAGE>
 
                          PART C.  OTHER INFORMATION
                                        

Item 24.  Financial Statements and Exhibits
          ---------------------------------

(a)  Financial statements for the Trust as of March 31, 1998, and for its fiscal
     year then ended, including notes thereto, and the reports of
     PricewaterhouseCoopers LLP (formerly Price Waterhouse LLP) thereon, dated
     May 22, 1998 are incorporated by reference from the Annual Report.
     Financial statements for PIMCO Municipal Bond Fund as of March 31, 1998,
     including notes thereto, and the report of PricewaterhouseCoopers LLP
     (formerly Price Waterhouse LLP) thereon, dated May 22, 1998, are included
     in the Statement of Additional Information.

(b)  Exhibits

     (1)   (i)  Declaration of Trust of Registrant/8/

          (ii)  Form of Amended and Restated Establishment and Designation of
                Series of Shares of Beneficial Interest/9/

     (2)  Form of By-laws of Registrant/8/

     (3)  Not applicable

     (4)  Not applicable

     (5)  (i)    Form of Investment Advisory Contract/8/

          (ii)   Form of Amendment to Investment Advisory Contract/8/

          (iii)  Form of Supplement to Investment Advisory Contract Relating to
                 StocksPLUS Short Strategy Fund/3/

          (iv)   Form of Supplement to Investment Advisory Contract Relating to
                 Balanced Fund/4/

          (v)    Form of Supplement to Investment Advisory Contract Relating to
                 Global Bond Fund II/6/

          (vi)   Form of Supplement to Investment Advisory Contract Relating to
                 Real Return Bond Fund/6/

          (vii)  Form of Supplement to Investment Advisory Contract Relating to
                 Low Duration Mortgage Fund, Total Return Mortgage Fund,
                 Emerging Markets Bond Fund, and Emerging Markets Bond Fund
                 II/7/
<PAGE>
 
          (viii)  Form of Supplement to Investment Advisory Contract Relating to
                  Municipal Bond Fund /10/

     (6)  Form of Amended and Restated Distribution Contract /10/

     (7)  Not applicable

     (8)  Form of Custodian Agreement/8/

     (9)  (i)    Form of Amended and Restated Administration Agreement /10/

          (ii)   Form of Shareholder Servicing Agreement /10/
 
          (iii)  Form of Transfer Agency Agreement/8/

          (iv)   Form of Transfer Agency Agreement with Shareholder Services,
                 Inc./2/

    (10)  Opinion and Consent of Counsel
 
    (11)  Consents of Price Waterhouse LLP

    (12)  Not applicable

    (13)  Not applicable

    (14)  Not applicable

    (15)  (i)    Form of Distribution and Servicing Plan for Class A Shares/5/

          (ii)   Form of Distribution and Servicing Plan for Class B Shares/5/

          (iii)  Form of Distribution and Servicing Plan for Class C Shares/5/

          (iv)   Form of Amended and Restated Distribution Plan for
                 Administrative Class Shares/8/

          (v)    Form of Amended and Restated Administrative Services Plan for
                 Administrative Class Shares/8/

    (16)  Calculation of Performance/1/

    (17)  Financial Data Schedules

                                      -2-
<PAGE>
 
    (18)  Form of Amended and Restated Multi-Class Plan adopted pursuant to Rule
          18f-3 /10/

    (19)  Powers of Attorney and Secretary's Certificate/7/
 
- ------------------------------
    /1/   Filed with Post-Effective Amendment No. 23 on June 1, 1995.

    /2/   Filed with Post Effective Amendment No. 33 to the Registration
          Statement of PIMCO Advisors Funds (File No. 2-87203) on November 30,
          1995.

    /3/   Filed with Post-Effective Amendment No. 27 on January 16, 1996.

    /4/   Filed with Post-Effective Amendment No. 28 on April 1, 1996.

    /5/   Filed with Registration Statement on Form N-14 (File No. 333-12871) on
          September 27, 1996.

    /6/   Filed with Post Effective Amendment No. 33 on January 13, 1997.

    /7/   Filed with Post-Effective Amendment No. 36 on July 11, 1997.

    /8/   Filed with Post-Effective Amendment No. 37 on November 17, 1997.

    /9/   Filed with Post-Effective Amendment No. 39 on January 15, 1998.

    /11/  Filed with Post-Effective Amendment No. 40 on March 13, 1998.

Item 25.  Persons Controlled by or Under Common Control With Registrant
          -------------------------------------------------------------

     No person is controlled by or under common control with the Registrant.

Item 26.  Number of Holders of Securities
          -------------------------------

     As of June 30, 1998, the number of record holders of each Fund and
     Class thereof of the Registrant were as follows:

<TABLE>
<CAPTION>
Fund                                   Institutional       Administrative           A            B            C
- ----------------------------------   -----------------   -------------------   -----------   ----------   ----------
<S>                                  <C>                 <C>                   <C>           <C>          <C>
Money Market                                        34                     3           901          205        4,175
Short-Term                                         102                     5           219           37          326
Low Duration                                       652                    19         1,244        1,096        3,628
Low Duration II                                     46                     1             0            0            0
Low Duration III                                     6                     0             0            0            0
Moderate Duration                                   22                     0             0            0            0
High Yield                                         237                    16         2,500        7,805       17,732
Total Return                                     1,455                    81        23,877        9,781       24,295
</TABLE> 

                                      -3-
<PAGE>
 
<TABLE>
<CAPTION>
Fund                                   Institutional       Administrative           A            B            C
- ----------------------------------   -----------------   -------------------   -----------   ----------   ----------
<S>                                  <C>                 <C>                   <C>           <C>          <C>
Total Return II                                     78                    11             0            0            0
Total Return III                                    43                     5             0            0            0
Commercial Mortgage Securities                       0                     0             0            0            0
Long-Term U.S. Government                           29                     3           225          461          442
Real Return Bond                                    11                     0            21           95          138
Foreign Bond                                        66                     3           564          929        1,209
Global Bond                                         48                     4             0            0            0
Global Bond II                                       3                     0           236          299          391
International Bond                                 137                     0             0            0            0
StocksPLUS                                         102                     7         3,141        8,492        8,185
StocksPLUS Short Strategy                            0                     0             0            0            0
Strategic Balanced                                   7                     0             0            0            0
Low Duration Mortgage                                2                     0             0            0            0
Total Return Mortgage                                3                     0             0            0            0
Emerging Market Bond                                 4                     0            20           18           22
Emerging Market Bond II                              9                     0             0            0            0
Municipal Bond                                       2                     0            99           69        1,411
</TABLE>

Item 27.  Indemnification
          ---------------
     Reference is made to Article IV of the Registrant's Declaration of Trust,
     which was filed with the Registrant's initial Registration Statement.

     Insofar as indemnification for liabilities arising under the Securities Act
     of 1933 may be permitted to trustees, officers and controlling persons of
     the Registrant by the Registrant pursuant to the Declaration of Trust or
     otherwise, the Registrant is aware that in the opinion of the Securities
     and Exchange Commission, such indemnification is against public policy as
     expressed in the Act and, public policy as expressed in the Act and,
     therefore, is unenforceable. In the event that a claim for indemnification
     against such liabilities (other than the payment by the Registrant of
     expenses incurred or paid by trustees, officers or controlling persons of
     the Registrant in connection with the successful defense of any act, suit
     or proceeding) is asserted by such trustees, officers or controlling
     persons in connection with the shares being registered, the Registrant
     will, unless in the opinion of its counsel the matter has been settled by
     controlling precedent, submit to a court of appropriate jurisdiction the
     question whether such indemnification by it is against public policy as
     expressed in the Act and will be governed by the final adjudication of such
     issues.

Item 28.  Business and Other Connections of Investment Adviser
          ----------------------------------------------------

     The directors and officers of PIMCO and their business and other
     connections are as follows:

Name                   Business and Other Connections
- ----                   ------------------------------

Allan, George C.       Senior Vice President, PIMCO and PIMCO Management, Inc.

                                      -4-
<PAGE>
 
Arnold, Tamara J.      Senior Vice President, PIMCO and PIMCO Management, Inc.

Banno, Denise C.       Vice President, PIMCO and PIMCO Management, Inc.

Barbi, Leslie A.       Senior Vice President, PIMCO and PIMCO Management, Inc.

Benz, William R. II    Managing Director, PIMCO; Director and Managing Director,
                       PIMCO Management, Inc.; Member of PIMCO Partners LLC.

Bishop, Gregory A.     Vice President, PIMCO.

Brynjolfsson, John B.  Vice President, PIMCO and PIMCO Management, Inc.

Burns, R. Wesley       Executive Vice President, PIMCO and PIMCO Management,
                       Inc.; President and Trustee of the Trust and PIMCO
                       Variable Insurance Trust; President and Director of PIMCO
                       Commercial Mortgage Securities Trust, Inc.; Executive
                       Vice President, PIMCO Funds: Multi-Manager Series.

Cohen, Carl J.         Vice President, PIMCO and PIMCO Management, Inc.

Coleman, Jerry         Vice President, PIMCO and PIMCO Management, Inc.

Cummings, Doug         Vice President, PIMCO.

Cupps, Wendy W.        Vice President, PIMCO and PIMCO Management, Inc.

Dorff, David J.        Vice President, PIMCO and PIMCO Management, Inc.

Dow, Michael           Vice President, PIMCO, PIMCO Management, Inc. and the
                       Trust.

Dunn, Anita            Vice President, PIMCO and PIMCO Management, Inc.

Ehlert, A. Benjamin    Executive Vice President, PIMCO and PIMCO Management,
                       Inc.

Ettl, Robert A.        Senior Vice President, PIMCO and PIMCO Management, Inc.

Faillace, Anthony L.   Vice President, PIMCO and PIMCO Management, Inc.

                                      -5-
<PAGE>
 
Fitzgerald, Robert M.  Chief Financial Officer and Treasurer, PIMCO, PIMCO
                       Management, Inc., Cadence Capital Management, Inc., NFJ
                       Investment Group, NFJ Management, Inc., Parametric
                       Portfolio Associates, Parametric Management Inc.,
                       StocksPLUS Management Inc. and PIMCO Funds Distributors
                       LLC; Chief Financial Officer and Assistant Treasurer,
                       Cadence Capital Management; Chief Financial Officer and
                       Treasurer, Columbus Circle Investors and Columbus Circle
                       Investors Management Inc.; Chief Financial Officer and
                       Senior Vice President, PIMCO Advisors.

Frisch, Ursula T.      Vice President, PIMCO, PIMCO Management Inc. and the
                       Trust.

Gross, William H.      Managing Director, PIMCO; Director and Managing Director,
                       PIMCO Management, Inc.; Director and Vice President,
                       StocksPLUS Management, Inc.; Senior Vice President of the
                       Trust and PIMCO Variable Insurance Trust; Member of
                       Management Board, PIMCO Advisors; Member of PIMCO
                       Partners LLC.

Hague, John L.         Managing Director, PIMCO; Director and Managing Director,
                       PIMCO Management, Inc.; Member of PIMCO Partners LLC.

Hally, Gordon C.       Executive Vice President, PIMCO and PIMCO Management,
                       Inc.

Hamalainen, Pasi M.    Executive Vice President, PIMCO and PIMCO Management,
                       Inc.

Hardaway, John P.      Vice President, PIMCO and PIMCO Management, Inc.;
                       Treasurer of the Trust, PIMCO Variable Insurance Trust,
                       PIMCO Funds: Multi-Manager Series and PIMCO Commercial
                       Mortgage Securities Trust, Inc.

Harris, Brent R.       Managing Director, PIMCO; Director and Managing Director,
                       PIMCO Management, Inc.; Director and Vice President,
                       StocksPLUS Management, Inc.; Trustee and Chairman of the
                       Trust and PIMCO Commercial Mortgage Securities Trust,
                       Inc.; Member of Management Board, PIMCO Advisors; Member
                       of PIMCO Partners LLC.

Hattesohl, Joseph D.   Vice President, PIMCO and PIMCO Management, Inc.
                       Assistant Treasurer, the Trust, PIMCO Variable Insurance
                       Trust, PIMCO Funds: Multi-Manager Series and PIMCO
                       Commercial Mortgage Securities Trust, Inc.

Hayes, Raymond C.      Vice President, PIMCO, PIMCO Management, Inc. and the
                       Trust.

                                      -6-
<PAGE>
 
Herin, Robert G.          Vice President, PIMCO and PIMCO Management, Inc.

Hinman, David C.          Vice President, PIMCO and PIMCO Management, Inc.

Hocson, Liza              Vice President, PIMCO and PIMCO Management, Inc.

Hodge, Douglas M.         Executive Vice President, PIMCO and PIMCO Management,
                          Inc.

Holden, Brent L.          Executive Vice President, PIMCO and PIMCO Management,
                          Inc.

Holloway, Dwight F., Jr.  Vice President, PIMCO and PIMCO Management, Inc.

Howe, Jane T.             Vice President, PIMCO and PIMCO Management, Inc.

Hudoff, Mark              Vice President, PIMCO and PIMCO Management, Inc.

Isberg, Margaret E.       Executive Vice President, PIMCO and PIMCO Management,
                          Inc.; Senior Vice President of the Trust.

Kelleher, Thomas J.       Vice President, PIMCO and PIMCO Management, Inc.

Keller, James M.          Vice President, PIMCO and PIMCO Management, Inc.

Kennedy, Raymond G.       Senior Vice President, PIMCO and PIMCO Management,
                          Inc.

Kiesel, Mark R.           Vice President, PIMCO and PIMCO Management, Inc.

Kirkbaumer, Steven P.     Vice President, PIMCO and PIMCO Management, Inc.

Loftus, John S.           Executive Vice President, PIMCO and PIMCO Management,
                          Inc.; Vice President and Assistant Secretary,
                          StocksPLUS Management, Inc.

Lown, David               Vice President, PIMCO and PIMCO Management, Inc.

Mallegol, Andre J.        Vice President, PIMCO and PIMCO Management, Inc.

Martini, Michael E.       Vice President, PIMCO and PIMCO Management, Inc.

McDevitt, Joseph E.       Executive Vice President, PIMCO and PIMCO Management,
                          Inc.

Meiling, Dean S.          Managing Director, PIMCO; Director and Managing
                          Director, PIMCO Management, Inc.; Vice President of
                          the Trust and PIMCO Commercial Mortgage Securities
                          Trust, Inc.; Member of PIMCO Partners, LLC.

                                      -7-
<PAGE>
 
Muzzy, James F.           Managing Director, PIMCO; Director and Managing
                          Director, PIMCO Management, Inc.; Director and Vice
                          President, StocksPLUS Management, Inc.; Member of
                          PIMCO Partners LLC.

Nakamura, Doris S.        Vice President, PIMCO and PIMCO Management, Inc.

Nguyen, Vinh T.           Controller, PIMCO; Vice President, Controller, PIMCO
                          Advisors, Columbus Circle Investors Management, Inc.;
                          Cadence Capital Management, Inc.; NJF Management,
                          Inc., Parametric Management, Inc., StocksPLUS
                          Management, Inc., PIMCO Funds Distributors LLC, PIMCO
                          Management, Inc.

Ongaro, Douglas J.        Vice President, PIMCO and PIMCO Management, Inc.

Otterbein, Thomas J.      Senior Vice President, PIMCO and PIMCO Management,
                          Inc.

Paradis, Victoria M.      Vice President, PIMCO and PIMCO Management, Inc.

Philipp, Elizabeth M.     Vice President, PIMCO and PIMCO Management, Inc.

Pittman, David J.         Vice President, PIMCO and PIMCO Management, Inc.

Podlich, William F. III   Managing Director, PIMCO; Director and Managing
                          Director, PIMCO Management, Inc.; Vice President,
                          PIMCO Commercial Mortgage Securities Trust, Inc.,
                          Member of Management Board, PIMCO Advisors; Member of
                          PIMCO Partners LLC.

Powers, William C.        Managing Director, PIMCO; Director and Managing
                          Director, PIMCO Management, Inc.; Senior Vice
                          President, PIMCO Commercial Mortgage Securities Trust,
                          Inc.; Member of PIMCO Partners LLC.

Randall, Terry A.         Vice President, PIMCO and PIMCO Management, Inc.

Rennie, Edward P.         Senior Vice President, PIMCO and PIMCO Management,
                          Inc.

Roney, Scott L.           Senior Vice President, PIMCO and PIMCO Management,
                          Inc.

Rosborough, Michael J.    Senior Vice President, PIMCO and PIMCO Management,
                          Inc.

Ruthen, Seth R.           Vice President, PIMCO and PIMCO Management, Inc.

                                      -8-
<PAGE>
 
Sargent, Jeffrey M.       Vice President, PIMCO, PIMCO Management, Inc., the
                          Trust, PIMCO Variable Insurance Trust, PIMCO
                          Commercial Mortgage Securities Trust, Inc. and PIMCO
                          Funds: Multi-Manager Series .

Schmider, Ernest L.       Executive Vice President, Secretary, Chief
                          Administrative and Legal Officer, PIMCO and PIMCO
                          Management, Inc.; Secretary, PIMCO Partners LLC;
                          Director, Assistant Secretary and Assistant Treasurer,
                          StocksPLUS Management, Inc.

Scholey, Leland T.        Senior Vice President, PIMCO, PIMCO Management, Inc.
                          and the Trust.

Selby, Richard W.         Senior Vice President, Chief Technology Officer,
                          PIMCO.

Seliga, Denise C.         Vice President, PIMCO and PIMCO Management, Inc.

Seymour, Rita J.          Vice President, PIMCO and PIMCO Management, Inc.

Sullivan, Christopher     Vice President, PIMCO and PIMCO Management, Inc.

Sylwester, Cheryl L.      Vice President, PIMCO and PIMCO Management, Inc.

Thomas, Lee R.            Managing Director, PIMCO; Director and Managing
                          Director, PIMCO Management, Inc.; Member PIMCO
                          Partners LLC.

Thompson, William S. Jr.  Chief Executive Officer and Managing Director, PIMCO;
                          Director, Managing Director and Chief Executive
                          Officer, PIMCO Management, Inc.; Director and
                          President, StocksPLUS Management, Inc.; Director,
                          Thomson Advisory Group; Senior Vice President of PIMCO
                          Variable Insurance Trust; Vice President of the Trust
                          and PIMCO Commercial Mortgage Securities Trust, Inc.;
                          Member of Management Board, PIMCO Advisors; Member,
                          President and Chief Executive Officer of PIMCO
                          Partners LLC.

Trosky, Benjamin L.       Managing Director, PIMCO; Director and Managing
                          Director, PIMCO Management, Inc.; Senior Vice
                          President, PIMCO Commercial Mortgage Securities Trust,
                          Inc.; Member of Management Board, PIMCO Advisors;
                          Member of PIMCO Partners LLC.

Tyson, Richard E.         Vice President, PIMCO and PIMCO Management, Inc.

Van de Zilver, Peter A.   Vice President, PIMCO and PIMCO Management, Inc.

Wegener, Marilyn          Vice President, PIMCO and PIMCO Management, Inc.

                                      -9-
<PAGE>
 
Weil, Richard M.       Assistant Secretary, PIMCO, Columbus Circle Investors,
                       Columbus Circle Investors Management, Inc., Cadence
                       Capital Management, and PIMCO Funds Distributors LLC;
                       Senior Vice President and Assistant Secretary, PIMCO
                       Management, Inc.; Senior Vice President Legal and
                       Secretary, PIMCO Advisors; Senior Vice President and
                       Secretary, Thomson Advisory Group; Secretary, Cadence
                       Capital Management, Inc. NFJ Management, Inc., Parametric
                       Management, Inc., NFJ Investment Group, Parametric
                       Portfolio Associates, and StocksPLUS Management, Inc.;
                       Vice President, PIMCO Funds: Multi-Manager Series.

Westhead, Paul C.      Vice President, PIMCO and PIMCO Management, Inc.

Wilsey, Kristen M.     Senior Vice President, of the Trust, PIMCO and PIMCO
                       Management, Inc.

Wood, George H.        Senior Vice President, PIMCO and PIMCO Management, Inc.

Yetter, Michael A.     Vice President, PIMCO and PIMCO Management, Inc.

Young, David           Vice President, PIMCO

The address of PIMCO is 840 Newport Center Drive, Newport Beach, CA 92260.

The address of PIMCO Advisors L.P. is 800 Newport Center Drive, Newport Beach,
CA 92660.

The address of PIMCO Funds Distributors LLC is 2187 Atlantic Street, Stamford,
CT 06902.

Item 29.  Principal Underwriters
          ----------------------

(a)  PIMCO Funds Distributors LLC (the "Distributor") serves as Distributor of
     Shares of the Trust.  The Distributor also acts as the principal
     underwriter for PIMCO Funds:  Multi-Manager Series.  The Distributor is a
     wholly-owned subsidiary of PIMCO Advisors.

(b)
<TABLE>
<CAPTION>
Name and Principal                    Positions and Offices             Positions and Offices
Business Address*                       with Underwriter                   with Registrant
- ------------------------------   -------------------------------   -------------------------------
<S>                              <C>                               <C>
Booth, Jeffrey L.                Vice President                                 None
Bosch, James D.                  Regional Vice President                        None
</TABLE> 

                                      -10-
<PAGE>
 
<TABLE>
<CAPTION>
Name and Principal                    Positions and Offices             Positions and Offices
Business Address*                       with Underwriter                   with Registrant
- ------------------------------   -------------------------------   -------------------------------
<S>                              <C>                               <C>
Brennan, Deborah P.              Vice President, Compliance                     None
                                 Officer

Clark, Timothy R.                Senior Vice President                          None

Crean, Kelly D.                  Vice President                                 None

Fessel, Jonathan P.              Vice President                                 None

Fitzgerald, Robert M.            Chief Financial Officer and                    None
                                 Treasurer

Gallagher, Michael J.            Regional Vice President                        None

Goldsmith, David S.              Vice President                                 None

Gray, Ronald H.                  Vice President                                 None

Hussey, John B.                  Regional Vice President                        None

Janeczek, Edward W.              Senior Vice President                          None

Jobe, Stephen R.                 Vice President                                 None

Lazcano, Raymond                 Vice President                                 None

Lynch, William E.                Senior Vice President                          None

McCarthy, Jacqueline A.          Vice President                                 None

Maloney, Kevin D.                Compliance Officer                             None

Meyers, Andrew J.                Executive Vice President                       None

Moyer, Fiora N.                  Regional Vice President                        None

Murphy (Jr.), George E.          Vice President                                 None

Murphy, Kerry A.                 Vice President                                 None

Neugebauer, Phil J.              Vice President                                 None

Nguyen, Vinh T.                  Vice President, Controller                     None

Pearlman, Joffrey H.             Regional Vice President                        None
</TABLE> 

                                      -11-
<PAGE>
 
<TABLE>
<CAPTION>
Name and Principal                    Positions and Offices             Positions and Offices
Business Address*                       with Underwriter                   with Registrant
- ------------------------------   -------------------------------   -------------------------------
<S>                              <C>                               <C>
Pisapia, Glynne P.               Regional Vice President                        None

Schott, Newton B., Jr.           Executive Vice President/                      None
                                 Secretary, Chief
                                 Administrative/ Legal Officer
                                 and Secretary

Smith, Robert M.                 Vice President                                 None

Spear, Ellen Z.                  Vice President                                 None

Sullivan, Daniel W.              Regional Vice President                        None

Thomas, William H., Jr.          Regional Vice President                        None

Treadway, Stephen J.             Chairman, President and Chief                  None
                                 Executive Officer

Troyer, Paul H.                  Senior Vice President                          None

Trumbore, Brian F.               Executive Vice President                       None

Weil, Richard M.                 Assistant Secretary                            None

Zimmerman, Glen A.               Vice President                                 None

</TABLE>
- -------------------                                        
*  The business address of all officers of the Distributor is either 2187
Atlantic Street, Stamford, CT 06902 or 800 Newport Center Drive, Newport Beach,
CA 92660.

Item 30.  Location of Accounts and Records
          --------------------------------

          The account books and other documents required to be maintained by
          Registrant pursuant to Section 31(a) of the Investment Company Act of
          1940 and the Rules thereunder will be maintained at the offices of
          Pacific Investment Management Company, 840 Newport Center Drive,
          Newport Beach, California 92660, Investors Fiduciary Trust Company,
          801 Pennsylvania, Kansas City, Missouri 64105, and Shareholder
          Services, Inc., P.O. Box 5866, Denver, Colorado 80217.

Item 31.  Management Services
          -------------------

          Not applicable

Item 32.  Undertakings
          ------------

                                      -12-
<PAGE>
 
     (a)  Not applicable.

     (b)  Registrant undertakes to file a post-effective amendment, using
          financial statements which need not be certified, within four to six
          months from the latter of the effective date of a post-effective
          amendment to Registrant's 1933 Act registration statement which
          provides for the addition of a new series of Registrant or the date on
          which shares of such series are first sold (other than shares sold for
          seed money).

     (c)  Registrant undertakes to furnish to each person to whom a prospectus
          is delivered with a copy of Registrant's latest annual report to
          shareholders upon request and without charge.

     (d)  Registrant undertakes to call a meeting of shareholders for the
          purpose of considering the removal of a person serving as Trustee if
          requested in writing to do so by the holders of not less than 10% of
          the outstanding shares of Registrant.

                                      -13-
<PAGE>
 
                                   SIGNATURES

  Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, the Registrant certifies that it meets all of the
requirements for effectiveness of the Registration Statement pursuant to Rule
485(b) under the Securities Act of 1933 and has duly caused this Post-Effective
Amendment No. 41 to its Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Washington in the
District of Columbia on the 29th day of July, 1998.

                                  PIMCO FUNDS
                                  (Registrant)

                  By: ____________________________________
                           R. Wesley Burns*
                              President

                 *By:   /s/ Robert W. Helm
                      -------------------------------------
                       Robert W. Helm, as attorney-in-fact

  Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated:

Signature                       Title                   Date


____________________________    Trustee                 July 29, 1998
Guilford C. Babcock*


____________________________    Trustee                 July 29, 1998
Thomas P. Kemp*


____________________________    Trustee                 July 29, 1998
Brent R. Harris*


____________________________    Trustee                 July 29, 1998
William J. Popejoy*


____________________________    Trustee                 July 29, 1998
Vern O. Curtis*

                                      -14-
<PAGE>
 
____________________________    President               July 29, 1998
R. Wesley Burns*                (Principal Executive
                                Officer)

____________________________    Treasurer               July 29, 1998
John P. Hardaway*               (Principal Financial
                                and Accounting
                                Officer)


*By:   /s/ Robert W. Helm
    ------------------------
    Robert W. Helm,
    as attorney-in-fact

     ___________________ 
*    Pursuant to power of attorney filed with Post-Effective Amendment No. 36 to
     Registration Statement No. 33-12113 on July 11, 1997.

                                      -15-
<PAGE>
 
                                  PIMCO Funds

                          INDEX TO EXHIBITS FILED WITH
                        POST-EFFECTIVE AMENDMENT NO. 41

Exhibit 10       Opinion and Consent of Counsel (EDGAR Exhibit 99.B10).

Exhibit 11       Consents of Price Waterhouse LLP (EDGAR Exhibit 99.B11).

Exhibit 17       Financial Data Schedules (EDGAR Exhibit 27).

<PAGE>
 
                                                                      EXHIBIT 10

                            DECHERT PRICE & RHOADS
                             1775 Eye Street, N.W.
                            Washington, D.C. 20006

                            Telephone: 202-261-3300
                               Fax: 202-261-3333


                                 July 30, 1998

PIMCO Funds:  Pacific Investment Management Series
840 Newport Center Drive, Suite 300
Newport Beach, California 92660

           Re:  PIMCO Funds:  Pacific Investment Management Series
                (File Nos. 33-12113 and 811-5028)
                ---------------------------------

Dear Sirs:

     In connection with the registration under the Securities Act of 1933, as 
amended, of an indefinite number of shares of beneficial interest of PIMCO 
Funds:  Pacific Investment Management Series (the "Trust"), we have examined 
such matters as we have deemed necessary to give this opinion.

     On the basis of the foregoing, it is our opinion that the shares of the 
Trust have been duly authorized and, when paid for as contemplated by the 
Trust's Registration Statement, will be validly issued, fully paid and 
non-assessable by the Trust.


     We hereby consent to the use of this opinion as an exhibit to the 
Registration Statement and to all references to our firm therein.

                                   Very truly yours,



                                   /s/ Dechert Price & Rhoads

<PAGE>
 
                                                                      EXHIBIT 11

                      Consent of Independent Accountants


We hereby consent to the incorporation by reference in the Prospectuses and
Statement of Additional Information constituting parts of this Post-Effective
Amendment No. 41 to the registration statement on Form N-1A (the "Registration
Statement") of our reports dated May 22, 1998, relating to the financial
statements and financial highlights appearing in the March 31, 1998 Annual
Reports to Shareholders of the Total Return Fund, Total Return Fund II, Total
Return Fund III, Total Return Mortgage Fund, Moderate Duration Fund, Low
Duration Fund, Low Duration Fund II, Low Duration Fund III, Low Duration
Mortgage Fund, Short-Term Fund, Long-Term U.S. Government Fund, Real Return Bond
Fund, Foreign Bond Fund, Global Bond Fund, Global Bond Fund II, Emerging Markets
Bond Fund, High Yield Fund, Money Market Fund, StocksPLUS Fund and Strategic
Balanced Fund (each a Portfolio of PIMCO Funds:  Pacific Investment Management
Series) which are also incorporated by reference into the Registration
Statement. We also consent to the references to us under the headings "Financial
Highlights" and "Independent Accountants" in the Prospectuses and under the
headings "Independent Accountants" and "Financial Statements" in the Statement
of Additional Information.

PricewaterhouseCoopers LLP

Kansas City, Missouri
July 28, 1998
<PAGE>
 
                       Consent of Independent Accountants


We hereby consent to the use in the Statement of Additional Information
constituting part of this Post-Effective Amendment No. 41 to the registration
statement on Form  N-1A (the "Registration Statement") of our report dated May
22, 1998, relating to the financial statements and financial highlights of the
Municipal Bond Fund (one of the Portfolios constituting the PIMCO Funds:
Pacific Investment Management Series) which appears in such Statement of
Additional Information, and to the incorporation by reference of our report into
the Prospectuses which constitutes part of this Registration Statement. We also
consent to the references to us under the headings "Financial Highlights" and
"Independent Accountants" in the Prospectuses and under the headings
"Independent Accountants" and "Financial Statements" in the Statement of
Additional Information.

PricewaterhouseCoopers LLP

Kansas City, Missouri
July 28, 1998

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 231
  <NAME> EMERGING MARKETS BOND FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                      5155
<INVESTMENTS-AT-VALUE>                                     5241
<RECEIVABLES>                                               161
<ASSETS-OTHER>                                                2
<OTHER-ITEMS-ASSETS>                                        203
<TOTAL-ASSETS>                                             5607
<PAYABLE-FOR-SECURITIES>                                   1166
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                     8
<TOTAL-LIABILITIES>                                        1174
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   4512
<SHARES-COMMON-STOCK>                                       380
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    27
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    195
<ACCUM-APPREC-OR-DEPREC>                                     89
<NET-ASSETS>                                               4433
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           207
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               24
<NET-INVESTMENT-INCOME>                                     183
<REALIZED-GAINS-CURRENT>                                   (108)
<APPREC-INCREASE-CURRENT>                                    89
<NET-CHANGE-FROM-OPS>                                       164
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   165
<DISTRIBUTIONS-OF-GAINS>                                     51
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     395
<NUMBER-OF-SHARES-REDEEMED>                                  37
<SHARES-REINVESTED>                                          22
<NET-CHANGE-IN-ASSETS>                                     4433
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        11
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              24
<AVERAGE-NET-ASSETS>                                       3380
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.46
<PER-SHARE-GAIN-APPREC>                                   (0.18)
<PER-SHARE-DIVIDEND>                                       0.46
<PER-SHARE-DISTRIBUTIONS>                                  0.15
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.67
<EXPENSE-RATIO>                                            0.86
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 233
  <NAME> EMERGING MARKETS BOND FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                      5155
<INVESTMENTS-AT-VALUE>                                     5241
<RECEIVABLES>                                               161
<ASSETS-OTHER>                                                2
<OTHER-ITEMS-ASSETS>                                        203
<TOTAL-ASSETS>                                             5607
<PAYABLE-FOR-SECURITIES>                                   1166
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                     8
<TOTAL-LIABILITIES>                                        1174
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   4512
<SHARES-COMMON-STOCK>                                        34
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    27
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    195
<ACCUM-APPREC-OR-DEPREC>                                     89
<NET-ASSETS>                                               4433
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           207
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               24
<NET-INVESTMENT-INCOME>                                     183
<REALIZED-GAINS-CURRENT>                                   (108)
<APPREC-INCREASE-CURRENT>                                    89
<NET-CHANGE-FROM-OPS>                                       164
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                     9
<DISTRIBUTIONS-OF-GAINS>                                      3
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                      37
<NUMBER-OF-SHARES-REDEEMED>                                   6
<SHARES-REINVESTED>                                           1
<NET-CHANGE-IN-ASSETS>                                     4433
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        11
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              24
<AVERAGE-NET-ASSETS>                                        180
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.44
<PER-SHARE-GAIN-APPREC>                                   (0.18)
<PER-SHARE-DIVIDEND>                                       0.44
<PER-SHARE-DISTRIBUTIONS>                                  0.15
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.67
<EXPENSE-RATIO>                                            1.26
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 234
  <NAME> EMERGING MARKETS BOND FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                      5155
<INVESTMENTS-AT-VALUE>                                     5241
<RECEIVABLES>                                               161
<ASSETS-OTHER>                                                2
<OTHER-ITEMS-ASSETS>                                        203
<TOTAL-ASSETS>                                             5607
<PAYABLE-FOR-SECURITIES>                                   1166
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                     8
<TOTAL-LIABILITIES>                                        1174
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   4512
<SHARES-COMMON-STOCK>                                        31
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    27
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    195
<ACCUM-APPREC-OR-DEPREC>                                     89
<NET-ASSETS>                                               4433
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           207
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               24
<NET-INVESTMENT-INCOME>                                     183
<REALIZED-GAINS-CURRENT>                                   (108)
<APPREC-INCREASE-CURRENT>                                    89
<NET-CHANGE-FROM-OPS>                                       164
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                     6
<DISTRIBUTIONS-OF-GAINS>                                      4
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                      31
<NUMBER-OF-SHARES-REDEEMED>                                   0
<SHARES-REINVESTED>                                           1
<NET-CHANGE-IN-ASSETS>                                     4433
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        11
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              24
<AVERAGE-NET-ASSETS>                                        143
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.40
<PER-SHARE-GAIN-APPREC>                                   (0.20)
<PER-SHARE-DIVIDEND>                                       0.38
<PER-SHARE-DISTRIBUTIONS>                                  0.15
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.67
<EXPENSE-RATIO>                                            2.01
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 235
  <NAME> EMERGING MARKETS BOND FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                      5155
<INVESTMENTS-AT-VALUE>                                     5241
<RECEIVABLES>                                               161
<ASSETS-OTHER>                                                2
<OTHER-ITEMS-ASSETS>                                        203
<TOTAL-ASSETS>                                             5607
<PAYABLE-FOR-SECURITIES>                                   1166
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                     8
<TOTAL-LIABILITIES>                                        1174
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   4512
<SHARES-COMMON-STOCK>                                        14
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    27
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    195
<ACCUM-APPREC-OR-DEPREC>                                     89
<NET-ASSETS>                                               4433
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           207
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               24
<NET-INVESTMENT-INCOME>                                     183
<REALIZED-GAINS-CURRENT>                                   (108)
<APPREC-INCREASE-CURRENT>                                    89
<NET-CHANGE-FROM-OPS>                                       164
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                     4
<DISTRIBUTIONS-OF-GAINS>                                      2
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                      14
<NUMBER-OF-SHARES-REDEEMED>                                   0
<SHARES-REINVESTED>                                           1
<NET-CHANGE-IN-ASSETS>                                     4433
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        11
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              24
<AVERAGE-NET-ASSETS>                                         91
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.38
<PER-SHARE-GAIN-APPREC>                                   (0.18)
<PER-SHARE-DIVIDEND>                                       0.38
<PER-SHARE-DISTRIBUTIONS>                                  0.15
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.67
<EXPENSE-RATIO>                                            2.01
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 111
  <NAME> FOREIGN BOND FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    681526
<INVESTMENTS-AT-VALUE>                                   673178
<RECEIVABLES>                                             73601
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1867
<TOTAL-ASSETS>                                           748646
<PAYABLE-FOR-SECURITIES>                                 316688
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2152
<TOTAL-LIABILITIES>                                      318840
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 411893
<SHARES-COMMON-STOCK>                                     36526
<SHARES-COMMON-PRIOR>                                     22559
<ACCUMULATED-NII-CURRENT>                                 20944
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     63
<ACCUM-APPREC-OR-DEPREC>                                  (2968)
<NET-ASSETS>                                             429806
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22152
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1826
<NET-INVESTMENT-INCOME>                                   20326
<REALIZED-GAINS-CURRENT>                                  20051
<APPREC-INCREASE-CURRENT>                                 (2005)
<NET-CHANGE-FROM-OPS>                                     38372
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 18748
<DISTRIBUTIONS-OF-GAINS>                                   9705
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   21531
<NUMBER-OF-SHARES-REDEEMED>                                9581
<SHARES-REINVESTED>                                        2017
<NET-CHANGE-IN-ASSETS>                                   191183
<ACCUMULATED-NII-PRIOR>                                   12308
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 1501
<GROSS-ADVISORY-FEES>                                       812
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1826
<AVERAGE-NET-ASSETS>                                     305211
<PER-SHARE-NAV-BEGIN>                                     10.41
<PER-SHARE-NII>                                            0.66
<PER-SHARE-GAIN-APPREC>                                    0.61
<PER-SHARE-DIVIDEND>                                       0.63
<PER-SHARE-DISTRIBUTIONS>                                  0.31
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.74
<EXPENSE-RATIO>                                            0.50
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 112
  <NAME> FOREIGN BOND FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    681526
<INVESTMENTS-AT-VALUE>                                   673178
<RECEIVABLES>                                             73601
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1867
<TOTAL-ASSETS>                                           748646
<PAYABLE-FOR-SECURITIES>                                 316688
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2152
<TOTAL-LIABILITIES>                                      318840
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 411893
<SHARES-COMMON-STOCK>                                        29
<SHARES-COMMON-PRIOR>                                         3
<ACCUMULATED-NII-CURRENT>                                 20944
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     63
<ACCUM-APPREC-OR-DEPREC>                                  (2968)
<NET-ASSETS>                                             429806
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22152
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1826
<NET-INVESTMENT-INCOME>                                   20326
<REALIZED-GAINS-CURRENT>                                  20051
<APPREC-INCREASE-CURRENT>                                 (2005)
<NET-CHANGE-FROM-OPS>                                     38372
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                    13
<DISTRIBUTIONS-OF-GAINS>                                      7
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                      28
<NUMBER-OF-SHARES-REDEEMED>                                   4
<SHARES-REINVESTED>                                           2
<NET-CHANGE-IN-ASSETS>                                   191183
<ACCUMULATED-NII-PRIOR>                                   12308
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 1501
<GROSS-ADVISORY-FEES>                                       812
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1826
<AVERAGE-NET-ASSETS>                                        199
<PER-SHARE-NAV-BEGIN>                                     10.41
<PER-SHARE-NII>                                            0.63
<PER-SHARE-GAIN-APPREC>                                    0.61
<PER-SHARE-DIVIDEND>                                       0.60
<PER-SHARE-DISTRIBUTIONS>                                  0.31
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.74
<EXPENSE-RATIO>                                            0.75
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 113
  <NAME> FOREIGN BOND FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    681526
<INVESTMENTS-AT-VALUE>                                   673178
<RECEIVABLES>                                             73601
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1867
<TOTAL-ASSETS>                                           748646
<PAYABLE-FOR-SECURITIES>                                 316688
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2152
<TOTAL-LIABILITIES>                                      318840
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 411893
<SHARES-COMMON-STOCK>                                       892
<SHARES-COMMON-PRIOR>                                        68
<ACCUMULATED-NII-CURRENT>                                 20944
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     63
<ACCUM-APPREC-OR-DEPREC>                                  (2968)
<NET-ASSETS>                                             429806
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22152
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1826
<NET-INVESTMENT-INCOME>                                   20326
<REALIZED-GAINS-CURRENT>                                  20051
<APPREC-INCREASE-CURRENT>                                 (2005)
<NET-CHANGE-FROM-OPS>                                     38372
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   249
<DISTRIBUTIONS-OF-GAINS>                                    161
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     855
<NUMBER-OF-SHARES-REDEEMED>                                  66
<SHARES-REINVESTED>                                          35
<NET-CHANGE-IN-ASSETS>                                   191183
<ACCUMULATED-NII-PRIOR>                                   12308
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 1501
<GROSS-ADVISORY-FEES>                                       812
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1826
<AVERAGE-NET-ASSETS>                                       4169
<PER-SHARE-NAV-BEGIN>                                     10.41
<PER-SHARE-NII>                                            0.61
<PER-SHARE-GAIN-APPREC>                                    0.62
<PER-SHARE-DIVIDEND>                                       0.59
<PER-SHARE-DISTRIBUTIONS>                                  0.31
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.74
<EXPENSE-RATIO>                                            0.95
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 114
  <NAME> FOREIGN BOND FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    681526
<INVESTMENTS-AT-VALUE>                                   673178
<RECEIVABLES>                                             73601
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1867
<TOTAL-ASSETS>                                           748646
<PAYABLE-FOR-SECURITIES>                                 316688
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2152
<TOTAL-LIABILITIES>                                      318840
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 411893
<SHARES-COMMON-STOCK>                                       990
<SHARES-COMMON-PRIOR>                                       117
<ACCUMULATED-NII-CURRENT>                                 20944
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     63
<ACCUM-APPREC-OR-DEPREC>                                  (2968)
<NET-ASSETS>                                             429806
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22152
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1826
<NET-INVESTMENT-INCOME>                                   20326
<REALIZED-GAINS-CURRENT>                                  20051
<APPREC-INCREASE-CURRENT>                                 (2005)
<NET-CHANGE-FROM-OPS>                                     38372
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   311
<DISTRIBUTIONS-OF-GAINS>                                    238
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     896
<NUMBER-OF-SHARES-REDEEMED>                                  66
<SHARES-REINVESTED>                                          43
<NET-CHANGE-IN-ASSETS>                                   191183
<ACCUMULATED-NII-PRIOR>                                   12308
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 1501
<GROSS-ADVISORY-FEES>                                       812
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1826
<AVERAGE-NET-ASSETS>                                       5772
<PER-SHARE-NAV-BEGIN>                                     10.41
<PER-SHARE-NII>                                            0.53
<PER-SHARE-GAIN-APPREC>                                    0.61
<PER-SHARE-DIVIDEND>                                       0.50
<PER-SHARE-DISTRIBUTIONS>                                  0.31
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.74
<EXPENSE-RATIO>                                            1.70
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 115
  <NAME> FOREIGN BOND FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    681526
<INVESTMENTS-AT-VALUE>                                   673178
<RECEIVABLES>                                             73601
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1867
<TOTAL-ASSETS>                                           748646
<PAYABLE-FOR-SECURITIES>                                 316688
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2152
<TOTAL-LIABILITIES>                                      318840
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 411893
<SHARES-COMMON-STOCK>                                      1591
<SHARES-COMMON-PRIOR>                                       172
<ACCUMULATED-NII-CURRENT>                                 20944
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     63
<ACCUM-APPREC-OR-DEPREC>                                  (2968)
<NET-ASSETS>                                             429806
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22152
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1826
<NET-INVESTMENT-INCOME>                                   20326
<REALIZED-GAINS-CURRENT>                                  20051
<APPREC-INCREASE-CURRENT>                                 (2005)
<NET-CHANGE-FROM-OPS>                                     38372
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   485
<DISTRIBUTIONS-OF-GAINS>                                    362
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    1458
<NUMBER-OF-SHARES-REDEEMED>                                 112
<SHARES-REINVESTED>                                          73
<NET-CHANGE-IN-ASSETS>                                   191183
<ACCUMULATED-NII-PRIOR>                                   12308
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 1501
<GROSS-ADVISORY-FEES>                                       812
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1826
<AVERAGE-NET-ASSETS>                                       9094
<PER-SHARE-NAV-BEGIN>                                     10.41
<PER-SHARE-NII>                                            0.52
<PER-SHARE-GAIN-APPREC>                                    0.62
<PER-SHARE-DIVIDEND>                                       0.50
<PER-SHARE-DISTRIBUTIONS>                                  0.31
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.74
<EXPENSE-RATIO>                                            1.70
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 121
  <NAME> GLOBAL BOND FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    350746
<INVESTMENTS-AT-VALUE>                                   346061
<RECEIVABLES>                                             49184
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        414
<TOTAL-ASSETS>                                           395659
<PAYABLE-FOR-SECURITIES>                                 136232
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1606
<TOTAL-LIABILITIES>                                      137838
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 268576
<SHARES-COMMON-STOCK>                                     26439
<SHARES-COMMON-PRIOR>                                     21879
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     4637
<ACCUMULATED-NET-GAINS>                                      14
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  (6132)
<NET-ASSETS>                                             257821
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         18466
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1426
<NET-INVESTMENT-INCOME>                                   17040
<REALIZED-GAINS-CURRENT>                                   (576)
<APPREC-INCREASE-CURRENT>                                 (2734)
<NET-CHANGE-FROM-OPS>                                     13730
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 13779
<DISTRIBUTIONS-OF-GAINS>                                   5218
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    9748
<NUMBER-OF-SHARES-REDEEMED>                                6739
<SHARES-REINVESTED>                                        1552
<NET-CHANGE-IN-ASSETS>                                    41844
<ACCUMULATED-NII-PRIOR>                                    5553
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 7489
<GROSS-ADVISORY-FEES>                                       642
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1426
<AVERAGE-NET-ASSETS>                                     250447
<PER-SHARE-NAV-BEGIN>                                      9.86
<PER-SHARE-NII>                                            0.66
<PER-SHARE-GAIN-APPREC>                                   (0.10)
<PER-SHARE-DIVIDEND>                                       0.53
<PER-SHARE-DISTRIBUTIONS>                                  0.19
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.70
<EXPENSE-RATIO>                                            0.55
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 122
  <NAME> GLOBAL BOND FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    350746
<INVESTMENTS-AT-VALUE>                                   346061
<RECEIVABLES>                                             49184
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        414
<TOTAL-ASSETS>                                           395659
<PAYABLE-FOR-SECURITIES>                                 136232
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1606
<TOTAL-LIABILITIES>                                      137838
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 268576
<SHARES-COMMON-STOCK>                                       160
<SHARES-COMMON-PRIOR>                                        35
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     4637
<ACCUMULATED-NET-GAINS>                                      14
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  (6132)
<NET-ASSETS>                                             257821
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         18466
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1426
<NET-INVESTMENT-INCOME>                                   17040
<REALIZED-GAINS-CURRENT>                                   (576)
<APPREC-INCREASE-CURRENT>                                 (2734)
<NET-CHANGE-FROM-OPS>                                     13730
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   167
<DISTRIBUTIONS-OF-GAINS>                                     11
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    1869
<NUMBER-OF-SHARES-REDEEMED>                                1761
<SHARES-REINVESTED>                                          16
<NET-CHANGE-IN-ASSETS>                                    41844
<ACCUMULATED-NII-PRIOR>                                    5553
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 7489
<GROSS-ADVISORY-FEES>                                       642
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1426
<AVERAGE-NET-ASSETS>                                       3610
<PER-SHARE-NAV-BEGIN>                                      9.86
<PER-SHARE-NII>                                            0.59
<PER-SHARE-GAIN-APPREC>                                   (0.05)
<PER-SHARE-DIVIDEND>                                       0.51
<PER-SHARE-DISTRIBUTIONS>                                  0.19
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.70
<EXPENSE-RATIO>                                            0.80
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 191
  <NAME> GLOBAL BOND FUND II-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     60644
<INVESTMENTS-AT-VALUE>                                    60160
<RECEIVABLES>                                              6402
<ASSETS-OTHER>                                                3
<OTHER-ITEMS-ASSETS>                                        224
<TOTAL-ASSETS>                                            66789
<PAYABLE-FOR-SECURITIES>                                  24772
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   115
<TOTAL-LIABILITIES>                                       24887
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  42190
<SHARES-COMMON-STOCK>                                      2471
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                   141
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     12
<ACCUM-APPREC-OR-DEPREC>                                   (417)
<NET-ASSETS>                                              41902
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          1383
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              259
<NET-INVESTMENT-INCOME>                                    1124
<REALIZED-GAINS-CURRENT>                                   1252
<APPREC-INCREASE-CURRENT>                                  (178)
<NET-CHANGE-FROM-OPS>                                      2198
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   100
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    2462
<NUMBER-OF-SHARES-REDEEMED>                                   0
<SHARES-REINVESTED>                                          10
<NET-CHANGE-IN-ASSETS>                                    25002
<ACCUMULATED-NII-PRIOR>                                     701
<ACCUMULATED-GAINS-PRIOR>                                   169
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        50
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             259
<AVERAGE-NET-ASSETS>                                      19185
<PER-SHARE-NAV-BEGIN>                                      9.82
<PER-SHARE-NII>                                            0.06
<PER-SHARE-GAIN-APPREC>                                    0.09
<PER-SHARE-DIVIDEND>                                       0.05
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.92
<EXPENSE-RATIO>                                            0.55
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 193
  <NAME> GLOBAL BOND FUND II-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     60644
<INVESTMENTS-AT-VALUE>                                    60160
<RECEIVABLES>                                              6402
<ASSETS-OTHER>                                                3
<OTHER-ITEMS-ASSETS>                                        224
<TOTAL-ASSETS>                                            66789
<PAYABLE-FOR-SECURITIES>                                  24772
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   115
<TOTAL-LIABILITIES>                                       24887
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  42190
<SHARES-COMMON-STOCK>                                       688
<SHARES-COMMON-PRIOR>                                       706
<ACCUMULATED-NII-CURRENT>                                   141
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     12
<ACCUM-APPREC-OR-DEPREC>                                   (417)
<NET-ASSETS>                                              41902
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          1383
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              259
<NET-INVESTMENT-INCOME>                                    1124
<REALIZED-GAINS-CURRENT>                                   1252
<APPREC-INCREASE-CURRENT>                                  (178)
<NET-CHANGE-FROM-OPS>                                      2198
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   411
<DISTRIBUTIONS-OF-GAINS>                                    856
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     499
<NUMBER-OF-SHARES-REDEEMED>                                 623
<SHARES-REINVESTED>                                         105
<NET-CHANGE-IN-ASSETS>                                    25002
<ACCUMULATED-NII-PRIOR>                                     701
<ACCUMULATED-GAINS-PRIOR>                                   169
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        50
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             259
<AVERAGE-NET-ASSETS>                                       8309
<PER-SHARE-NAV-BEGIN>                                     10.84
<PER-SHARE-NII>                                            0.64
<PER-SHARE-GAIN-APPREC>                                    0.51
<PER-SHARE-DIVIDEND>                                       0.54
<PER-SHARE-DISTRIBUTIONS>                                  1.53
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.92
<EXPENSE-RATIO>                                            0.95
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 194
  <NAME> GLOBAL BOND FUND II-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     60644
<INVESTMENTS-AT-VALUE>                                    60160
<RECEIVABLES>                                              6402
<ASSETS-OTHER>                                                3
<OTHER-ITEMS-ASSETS>                                        224
<TOTAL-ASSETS>                                            66789
<PAYABLE-FOR-SECURITIES>                                  24772
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   115
<TOTAL-LIABILITIES>                                       24887
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  42190
<SHARES-COMMON-STOCK>                                       449
<SHARES-COMMON-PRIOR>                                       362
<ACCUMULATED-NII-CURRENT>                                   141
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     12
<ACCUM-APPREC-OR-DEPREC>                                   (417)
<NET-ASSETS>                                              41902
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          1383
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              259
<NET-INVESTMENT-INCOME>                                    1124
<REALIZED-GAINS-CURRENT>                                   1252
<APPREC-INCREASE-CURRENT>                                  (178)
<NET-CHANGE-FROM-OPS>                                      2198
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   182
<DISTRIBUTIONS-OF-GAINS>                                    598
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     117
<NUMBER-OF-SHARES-REDEEMED>                                  88
<SHARES-REINVESTED>                                          58
<NET-CHANGE-IN-ASSETS>                                    25002
<ACCUMULATED-NII-PRIOR>                                     701
<ACCUMULATED-GAINS-PRIOR>                                   169
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        50
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             259
<AVERAGE-NET-ASSETS>                                       4251
<PER-SHARE-NAV-BEGIN>                                     10.84
<PER-SHARE-NII>                                            0.66
<PER-SHARE-GAIN-APPREC>                                    0.41
<PER-SHARE-DIVIDEND>                                       0.46
<PER-SHARE-DISTRIBUTIONS>                                  1.53
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.92
<EXPENSE-RATIO>                                            1.70
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 195
  <NAME> GLOBAL BOND FUND II-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     60644
<INVESTMENTS-AT-VALUE>                                    60160
<RECEIVABLES>                                              6402
<ASSETS-OTHER>                                                3
<OTHER-ITEMS-ASSETS>                                        224
<TOTAL-ASSETS>                                            66789
<PAYABLE-FOR-SECURITIES>                                  24772
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   115
<TOTAL-LIABILITIES>                                       24887
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  42190
<SHARES-COMMON-STOCK>                                       616
<SHARES-COMMON-PRIOR>                                       491
<ACCUMULATED-NII-CURRENT>                                   141
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     12
<ACCUM-APPREC-OR-DEPREC>                                   (417)
<NET-ASSETS>                                              41902
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          1383
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              259
<NET-INVESTMENT-INCOME>                                    1124
<REALIZED-GAINS-CURRENT>                                   1252
<APPREC-INCREASE-CURRENT>                                  (178)
<NET-CHANGE-FROM-OPS>                                      2198
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   240
<DISTRIBUTIONS-OF-GAINS>                                    783
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     158
<NUMBER-OF-SHARES-REDEEMED>                                 128
<SHARES-REINVESTED>                                          94
<NET-CHANGE-IN-ASSETS>                                    25002
<ACCUMULATED-NII-PRIOR>                                     701
<ACCUMULATED-GAINS-PRIOR>                                   169
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                        50
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             259
<AVERAGE-NET-ASSETS>                                       5571
<PER-SHARE-NAV-BEGIN>                                     10.84
<PER-SHARE-NII>                                            0.55
<PER-SHARE-GAIN-APPREC>                                    0.52
<PER-SHARE-DIVIDEND>                                       0.46
<PER-SHARE-DISTRIBUTIONS>                                  1.53
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.92
<EXPENSE-RATIO>                                            1.70
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 171
  <NAME> HIGH YIELD FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   2109835
<INVESTMENTS-AT-VALUE>                                  2185181
<RECEIVABLES>                                             57292
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1050
<TOTAL-ASSETS>                                          2243523
<PAYABLE-FOR-SECURITIES>                                  26775
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  6088
<TOTAL-LIABILITIES>                                       32863
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2193777
<SHARES-COMMON-STOCK>                                    139702
<SHARES-COMMON-PRIOR>                                     67081
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     2529
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                  56082
<ACCUM-APPREC-OR-DEPREC>                                  75494
<NET-ASSETS>                                            2210660
<DIVIDEND-INCOME>                                          6121
<INTEREST-INCOME>                                        126284
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            11567
<NET-INVESTMENT-INCOME>                                  120838
<REALIZED-GAINS-CURRENT>                                  17622
<APPREC-INCREASE-CURRENT>                                 53329
<NET-CHANGE-FROM-OPS>                                    191789
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 90115
<DISTRIBUTIONS-OF-GAINS>                                   8670
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   85745
<NUMBER-OF-SHARES-REDEEMED>                               20969
<SHARES-REINVESTED>                                        7846
<NET-CHANGE-IN-ASSETS>                                  1161295
<ACCUMULATED-NII-PRIOR>                                    1003
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                78320
<GROSS-ADVISORY-FEES>                                      3671
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           11567
<AVERAGE-NET-ASSETS>                                    1058029
<PER-SHARE-NAV-BEGIN>                                     11.10
<PER-SHARE-NII>                                            0.98
<PER-SHARE-GAIN-APPREC>                                    0.65
<PER-SHARE-DIVIDEND>                                       0.98
<PER-SHARE-DISTRIBUTIONS>                                  0.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       11.66
<EXPENSE-RATIO>                                            0.50
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 172
  <NAME> HIGH YIELD FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   2109835
<INVESTMENTS-AT-VALUE>                                  2185181
<RECEIVABLES>                                             57292
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1050
<TOTAL-ASSETS>                                          2243523
<PAYABLE-FOR-SECURITIES>                                  26775
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  6088
<TOTAL-LIABILITIES>                                       32863
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2193777
<SHARES-COMMON-STOCK>                                      5998
<SHARES-COMMON-PRIOR>                                       940
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     2529
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                  56082
<ACCUM-APPREC-OR-DEPREC>                                  75494
<NET-ASSETS>                                            2210660
<DIVIDEND-INCOME>                                          6121
<INTEREST-INCOME>                                        126284
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            11567
<NET-INVESTMENT-INCOME>                                  120838
<REALIZED-GAINS-CURRENT>                                  17622
<APPREC-INCREASE-CURRENT>                                 53329
<NET-CHANGE-FROM-OPS>                                    191789
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  1993
<DISTRIBUTIONS-OF-GAINS>                                    190
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    5481
<NUMBER-OF-SHARES-REDEEMED>                                 546
<SHARES-REINVESTED>                                         123
<NET-CHANGE-IN-ASSETS>                                  1161295
<ACCUMULATED-NII-PRIOR>                                    1003
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                78320
<GROSS-ADVISORY-FEES>                                      3671
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           11567
<AVERAGE-NET-ASSETS>                                      25637
<PER-SHARE-NAV-BEGIN>                                     11.10
<PER-SHARE-NII>                                            0.95
<PER-SHARE-GAIN-APPREC>                                    0.65
<PER-SHARE-DIVIDEND>                                       0.95
<PER-SHARE-DISTRIBUTIONS>                                  0.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       11.66
<EXPENSE-RATIO>                                            0.75
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 173
  <NAME> HIGH YIELD FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   2109835
<INVESTMENTS-AT-VALUE>                                  2185181
<RECEIVABLES>                                             57292
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1050
<TOTAL-ASSETS>                                          2243523
<PAYABLE-FOR-SECURITIES>                                  26775
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  6088
<TOTAL-LIABILITIES>                                       32863
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2193777
<SHARES-COMMON-STOCK>                                      6077
<SHARES-COMMON-PRIOR>                                      2602
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     2529
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                  56082
<ACCUM-APPREC-OR-DEPREC>                                  75494
<NET-ASSETS>                                            2210660
<DIVIDEND-INCOME>                                          6121
<INTEREST-INCOME>                                        126284
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            11567
<NET-INVESTMENT-INCOME>                                  120838
<REALIZED-GAINS-CURRENT>                                  17622
<APPREC-INCREASE-CURRENT>                                 53329
<NET-CHANGE-FROM-OPS>                                    191789
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  3926
<DISTRIBUTIONS-OF-GAINS>                                    500
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    5603
<NUMBER-OF-SHARES-REDEEMED>                                2364
<SHARES-REINVESTED>                                         236
<NET-CHANGE-IN-ASSETS>                                  1161295
<ACCUMULATED-NII-PRIOR>                                    1003
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                78320
<GROSS-ADVISORY-FEES>                                      3671
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           11567
<AVERAGE-NET-ASSETS>                                      48539
<PER-SHARE-NAV-BEGIN>                                     11.10
<PER-SHARE-NII>                                            0.93
<PER-SHARE-GAIN-APPREC>                                    0.66
<PER-SHARE-DIVIDEND>                                       0.94
<PER-SHARE-DISTRIBUTIONS>                                  0.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       11.66
<EXPENSE-RATIO>                                            0.90
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 174
  <NAME> HIGH YIELD FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   2109835
<INVESTMENTS-AT-VALUE>                                  2185181
<RECEIVABLES>                                             57292
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1050
<TOTAL-ASSETS>                                          2243523
<PAYABLE-FOR-SECURITIES>                                  26775
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  6088
<TOTAL-LIABILITIES>                                       32863
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2193777
<SHARES-COMMON-STOCK>                                     13388
<SHARES-COMMON-PRIOR>                                      5431
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     2529
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                  56082
<ACCUM-APPREC-OR-DEPREC>                                  75494
<NET-ASSETS>                                            2210660
<DIVIDEND-INCOME>                                          6121
<INTEREST-INCOME>                                        126284
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            11567
<NET-INVESTMENT-INCOME>                                  120838
<REALIZED-GAINS-CURRENT>                                  17622
<APPREC-INCREASE-CURRENT>                                 53329
<NET-CHANGE-FROM-OPS>                                    191789
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  7402
<DISTRIBUTIONS-OF-GAINS>                                    944
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    8820
<NUMBER-OF-SHARES-REDEEMED>                                1243
<SHARES-REINVESTED>                                         381
<NET-CHANGE-IN-ASSETS>                                  1161295
<ACCUMULATED-NII-PRIOR>                                    1003
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                78320
<GROSS-ADVISORY-FEES>                                      3671
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           11567
<AVERAGE-NET-ASSETS>                                     101936
<PER-SHARE-NAV-BEGIN>                                     11.10
<PER-SHARE-NII>                                            0.84
<PER-SHARE-GAIN-APPREC>                                    0.66
<PER-SHARE-DIVIDEND>                                       0.85
<PER-SHARE-DISTRIBUTIONS>                                  0.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       11.66
<EXPENSE-RATIO>                                            1.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 175
  <NAME> HIGH YIELD FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   2109835
<INVESTMENTS-AT-VALUE>                                  2185181
<RECEIVABLES>                                             57292
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                       1050
<TOTAL-ASSETS>                                          2243523
<PAYABLE-FOR-SECURITIES>                                  26775
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  6088
<TOTAL-LIABILITIES>                                       32863
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2193777
<SHARES-COMMON-STOCK>                                     24429
<SHARES-COMMON-PRIOR>                                     18499
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                     2529
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                  56082
<ACCUM-APPREC-OR-DEPREC>                                  75494
<NET-ASSETS>                                            2210660
<DIVIDEND-INCOME>                                          6121
<INTEREST-INCOME>                                        126284
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            11567
<NET-INVESTMENT-INCOME>                                  120838
<REALIZED-GAINS-CURRENT>                                  17622
<APPREC-INCREASE-CURRENT>                                 53329
<NET-CHANGE-FROM-OPS>                                    191789
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 17859
<DISTRIBUTIONS-OF-GAINS>                                   1935
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   11386
<NUMBER-OF-SHARES-REDEEMED>                                6522
<SHARES-REINVESTED>                                        1066
<NET-CHANGE-IN-ASSETS>                                  1161295
<ACCUMULATED-NII-PRIOR>                                    1003
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                78320
<GROSS-ADVISORY-FEES>                                      3671
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           11567
<AVERAGE-NET-ASSETS>                                     241222
<PER-SHARE-NAV-BEGIN>                                     11.10
<PER-SHARE-NII>                                            0.85
<PER-SHARE-GAIN-APPREC>                                    0.65
<PER-SHARE-DIVIDEND>                                       0.85
<PER-SHARE-DISTRIBUTIONS>                                  0.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       11.66
<EXPENSE-RATIO>                                            1.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 081
  <NAME> INTERNATIONAL BOND FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   1157672
<INVESTMENTS-AT-VALUE>                                  1104207
<RECEIVABLES>                                            219292
<ASSETS-OTHER>                                             1464
<OTHER-ITEMS-ASSETS>                                       5514
<TOTAL-ASSETS>                                          1330477
<PAYABLE-FOR-SECURITIES>                                 509413
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 90442
<TOTAL-LIABILITIES>                                      599855
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 741902
<SHARES-COMMON-STOCK>                                    101717
<SHARES-COMMON-PRIOR>                                    123009
<ACCUMULATED-NII-CURRENT>                                 24481
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                   2739
<ACCUM-APPREC-OR-DEPREC>                                 (33022)
<NET-ASSETS>                                             730622
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         70974
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             4155
<NET-INVESTMENT-INCOME>                                   66819
<REALIZED-GAINS-CURRENT>                                  51653
<APPREC-INCREASE-CURRENT>                                (24242)
<NET-CHANGE-FROM-OPS>                                     94230
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 25130
<DISTRIBUTIONS-OF-GAINS>                                 105892
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   33657
<NUMBER-OF-SHARES-REDEEMED>                               73282
<SHARES-REINVESTED>                                       18333
<NET-CHANGE-IN-ASSETS>                                  (227328)
<ACCUMULATED-NII-PRIOR>                                   54413
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                30051
<GROSS-ADVISORY-FEES>                                      2045
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            4155
<AVERAGE-NET-ASSETS>                                     812852
<PER-SHARE-NAV-BEGIN>                                      7.79
<PER-SHARE-NII>                                            0.64
<PER-SHARE-GAIN-APPREC>                                    0.19
<PER-SHARE-DIVIDEND>                                       0.25
<PER-SHARE-DISTRIBUTIONS>                                  1.19
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        7.18
<EXPENSE-RATIO>                                            0.51
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 021
  <NAME> LONG-TERM U.S. GOV'T FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    114745
<INVESTMENTS-AT-VALUE>                                   116173
<RECEIVABLES>                                             12042
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                         23
<TOTAL-ASSETS>                                           128238
<PAYABLE-FOR-SECURITIES>                                  53459
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   340
<TOTAL-LIABILITIES>                                       53799
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  72038
<SHARES-COMMON-STOCK>                                      4591
<SHARES-COMMON-PRIOR>                                      2129
<ACCUMULATED-NII-CURRENT>                                   488
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     461
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   1452
<NET-ASSETS>                                              74439
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          2634
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              322
<NET-INVESTMENT-INCOME>                                    2312
<REALIZED-GAINS-CURRENT>                                   3273
<APPREC-INCREASE-CURRENT>                                  1860
<NET-CHANGE-FROM-OPS>                                      7445
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  2187
<DISTRIBUTIONS-OF-GAINS>                                    218
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    4747
<NUMBER-OF-SHARES-REDEEMED>                                2479
<SHARES-REINVESTED>                                         194
<NET-CHANGE-IN-ASSETS>                                    52511
<ACCUMULATED-NII-PRIOR>                                     438
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 2025
<GROSS-ADVISORY-FEES>                                       117
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             322
<AVERAGE-NET-ASSETS>                                      36540
<PER-SHARE-NAV-BEGIN>                                      9.39
<PER-SHARE-NII>                                            0.52
<PER-SHARE-GAIN-APPREC>                                    1.34
<PER-SHARE-DIVIDEND>                                       0.62
<PER-SHARE-DISTRIBUTIONS>                                  0.06
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.57
<EXPENSE-RATIO>                                            0.51
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 022
  <NAME> LONG-TERM U.S. GOV'T FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    114745
<INVESTMENTS-AT-VALUE>                                   116173
<RECEIVABLES>                                             12042
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                         23
<TOTAL-ASSETS>                                           128238
<PAYABLE-FOR-SECURITIES>                                  53459
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   340
<TOTAL-LIABILITIES>                                       53799
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  72038
<SHARES-COMMON-STOCK>                                       469
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                   488
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     461
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   1452
<NET-ASSETS>                                              74439
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          2634
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              322
<NET-INVESTMENT-INCOME>                                    2312
<REALIZED-GAINS-CURRENT>                                   3273
<APPREC-INCREASE-CURRENT>                                  1860
<NET-CHANGE-FROM-OPS>                                      7445
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   122
<DISTRIBUTIONS-OF-GAINS>                                     21
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     478
<NUMBER-OF-SHARES-REDEEMED>                                  18
<SHARES-REINVESTED>                                           9
<NET-CHANGE-IN-ASSETS>                                    52511
<ACCUMULATED-NII-PRIOR>                                     438
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 2025
<GROSS-ADVISORY-FEES>                                       117
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             322
<AVERAGE-NET-ASSETS>                                       3647
<PER-SHARE-NAV-BEGIN>                                     10.17
<PER-SHARE-NII>                                            0.26
<PER-SHARE-GAIN-APPREC>                                    0.51
<PER-SHARE-DIVIDEND>                                       0.31
<PER-SHARE-DISTRIBUTIONS>                                  0.06
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.57
<EXPENSE-RATIO>                                            0.76
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 023
  <NAME> LONG-TERM U.S. GOV'T FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    114745
<INVESTMENTS-AT-VALUE>                                   116173
<RECEIVABLES>                                             12042
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                         23
<TOTAL-ASSETS>                                           128238
<PAYABLE-FOR-SECURITIES>                                  53459
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   340
<TOTAL-LIABILITIES>                                       53799
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  72038
<SHARES-COMMON-STOCK>                                       583
<SHARES-COMMON-PRIOR>                                       128
<ACCUMULATED-NII-CURRENT>                                   488
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     461
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   1452
<NET-ASSETS>                                              74439
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          2634
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              322
<NET-INVESTMENT-INCOME>                                    2312
<REALIZED-GAINS-CURRENT>                                   3273
<APPREC-INCREASE-CURRENT>                                  1860
<NET-CHANGE-FROM-OPS>                                      7445
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   183
<DISTRIBUTIONS-OF-GAINS>                                     27
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     597
<NUMBER-OF-SHARES-REDEEMED>                                 154
<SHARES-REINVESTED>                                          11
<NET-CHANGE-IN-ASSETS>                                    52511
<ACCUMULATED-NII-PRIOR>                                     438
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 2025
<GROSS-ADVISORY-FEES>                                       117
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             322
<AVERAGE-NET-ASSETS>                                       3349
<PER-SHARE-NAV-BEGIN>                                      9.39
<PER-SHARE-NII>                                            0.48
<PER-SHARE-GAIN-APPREC>                                    1.34
<PER-SHARE-DIVIDEND>                                       0.58
<PER-SHARE-DISTRIBUTIONS>                                  0.06
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.57
<EXPENSE-RATIO>                                            0.91
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 024
  <NAME> LONG-TERM U.S. GOV'T FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    114745
<INVESTMENTS-AT-VALUE>                                   116173
<RECEIVABLES>                                             12042
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                         23
<TOTAL-ASSETS>                                           128238
<PAYABLE-FOR-SECURITIES>                                  53459
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   340
<TOTAL-LIABILITIES>                                       53799
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  72038
<SHARES-COMMON-STOCK>                                       711
<SHARES-COMMON-PRIOR>                                        48
<ACCUMULATED-NII-CURRENT>                                   488
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     461
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   1452
<NET-ASSETS>                                              74439
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          2634
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              322
<NET-INVESTMENT-INCOME>                                    2312
<REALIZED-GAINS-CURRENT>                                   3273
<APPREC-INCREASE-CURRENT>                                  1860
<NET-CHANGE-FROM-OPS>                                      7445
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   133
<DISTRIBUTIONS-OF-GAINS>                                     25
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     769
<NUMBER-OF-SHARES-REDEEMED>                                 118
<SHARES-REINVESTED>                                          12
<NET-CHANGE-IN-ASSETS>                                    52511
<ACCUMULATED-NII-PRIOR>                                     438
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 2025
<GROSS-ADVISORY-FEES>                                       117
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             322
<AVERAGE-NET-ASSETS>                                       2958
<PER-SHARE-NAV-BEGIN>                                      9.39
<PER-SHARE-NII>                                            0.39
<PER-SHARE-GAIN-APPREC>                                    1.35
<PER-SHARE-DIVIDEND>                                       0.50
<PER-SHARE-DISTRIBUTIONS>                                  0.06
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.57
<EXPENSE-RATIO>                                            1.66
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 025
  <NAME> LONG-TERM U.S. GOV'T FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    114745
<INVESTMENTS-AT-VALUE>                                   116173
<RECEIVABLES>                                             12042
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                         23
<TOTAL-ASSETS>                                           128238
<PAYABLE-FOR-SECURITIES>                                  53459
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   340
<TOTAL-LIABILITIES>                                       53799
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  72038
<SHARES-COMMON-STOCK>                                       686
<SHARES-COMMON-PRIOR>                                        29
<ACCUMULATED-NII-CURRENT>                                   488
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     461
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   1452
<NET-ASSETS>                                              74439
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          2634
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              322
<NET-INVESTMENT-INCOME>                                    2312
<REALIZED-GAINS-CURRENT>                                   3273
<APPREC-INCREASE-CURRENT>                                  1860
<NET-CHANGE-FROM-OPS>                                      7445
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   127
<DISTRIBUTIONS-OF-GAINS>                                     26
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     817
<NUMBER-OF-SHARES-REDEEMED>                                 171
<SHARES-REINVESTED>                                          11
<NET-CHANGE-IN-ASSETS>                                    52511
<ACCUMULATED-NII-PRIOR>                                     438
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                 2025
<GROSS-ADVISORY-FEES>                                       117
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             322
<AVERAGE-NET-ASSETS>                                       2795
<PER-SHARE-NAV-BEGIN>                                      9.39
<PER-SHARE-NII>                                            0.39
<PER-SHARE-GAIN-APPREC>                                    1.35
<PER-SHARE-DIVIDEND>                                       0.50
<PER-SHARE-DISTRIBUTIONS>                                  0.06
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.57
<EXPENSE-RATIO>                                            1.66
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 031
  <NAME> LOW DURATION FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   4106489
<INVESTMENTS-AT-VALUE>                                  4129223
<RECEIVABLES>                                            137930
<ASSETS-OTHER>                                             1823
<OTHER-ITEMS-ASSETS>                                        826
<TOTAL-ASSETS>                                          4269802
<PAYABLE-FOR-SECURITIES>                                1247421
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 20743
<TOTAL-LIABILITIES>                                     1268164
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2975977
<SHARES-COMMON-STOCK>                                    271121
<SHARES-COMMON-PRIOR>                                    280193
<ACCUMULATED-NII-CURRENT>                                   736
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     16
<ACCUM-APPREC-OR-DEPREC>                                  24941
<NET-ASSETS>                                            3001638
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                        202520
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            13984
<NET-INVESTMENT-INCOME>                                  188536
<REALIZED-GAINS-CURRENT>                                  25424
<APPREC-INCREASE-CURRENT>                                 38823
<NET-CHANGE-FROM-OPS>                                    252783
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                177691
<DISTRIBUTIONS-OF-GAINS>                                   7885
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                  144295
<NUMBER-OF-SHARES-REDEEMED>                              168625
<SHARES-REINVESTED>                                       15257
<NET-CHANGE-IN-ASSETS>                                    52823
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    7032
<OVERDIST-NET-GAINS-PRIOR>                                 9405
<GROSS-ADVISORY-FEES>                                      7416
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           13984
<AVERAGE-NET-ASSETS>                                    2779832
<PER-SHARE-NAV-BEGIN>                                      9.98
<PER-SHARE-NII>                                            0.65
<PER-SHARE-GAIN-APPREC>                                    0.23
<PER-SHARE-DIVIDEND>                                       0.65
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.18
<EXPENSE-RATIO>                                            0.43
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 032
  <NAME> LOW DURATION FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   4106489
<INVESTMENTS-AT-VALUE>                                  4129223
<RECEIVABLES>                                            137930
<ASSETS-OTHER>                                             1823
<OTHER-ITEMS-ASSETS>                                        826
<TOTAL-ASSETS>                                          4269802
<PAYABLE-FOR-SECURITIES>                                1247421
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 20743
<TOTAL-LIABILITIES>                                     1268164
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2975977
<SHARES-COMMON-STOCK>                                      4538
<SHARES-COMMON-PRIOR>                                      2361
<ACCUMULATED-NII-CURRENT>                                   736
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     16
<ACCUM-APPREC-OR-DEPREC>                                  24941
<NET-ASSETS>                                            3001638
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                        202520
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            13984
<NET-INVESTMENT-INCOME>                                  188536
<REALIZED-GAINS-CURRENT>                                  25424
<APPREC-INCREASE-CURRENT>                                 38823
<NET-CHANGE-FROM-OPS>                                    252783
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  1784
<DISTRIBUTIONS-OF-GAINS>                                     78
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    3319
<NUMBER-OF-SHARES-REDEEMED>                                1324
<SHARES-REINVESTED>                                         182
<NET-CHANGE-IN-ASSETS>                                    52823
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    7032
<OVERDIST-NET-GAINS-PRIOR>                                 9405
<GROSS-ADVISORY-FEES>                                      7416
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           13984
<AVERAGE-NET-ASSETS>                                      29215
<PER-SHARE-NAV-BEGIN>                                      9.98
<PER-SHARE-NII>                                            0.63
<PER-SHARE-GAIN-APPREC>                                    0.22
<PER-SHARE-DIVIDEND>                                       0.62
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.18
<EXPENSE-RATIO>                                            0.68
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 033
  <NAME> LOW DURATION FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   4106489
<INVESTMENTS-AT-VALUE>                                  4129223
<RECEIVABLES>                                            137930
<ASSETS-OTHER>                                             1823
<OTHER-ITEMS-ASSETS>                                        826
<TOTAL-ASSETS>                                          4269802
<PAYABLE-FOR-SECURITIES>                                1247421
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 20743
<TOTAL-LIABILITIES>                                     1268164
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2975977
<SHARES-COMMON-STOCK>                                     10761
<SHARES-COMMON-PRIOR>                                      5945
<ACCUMULATED-NII-CURRENT>                                   736
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     16
<ACCUM-APPREC-OR-DEPREC>                                  24941
<NET-ASSETS>                                            3001638
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                        202520
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            13984
<NET-INVESTMENT-INCOME>                                  188536
<REALIZED-GAINS-CURRENT>                                  25424
<APPREC-INCREASE-CURRENT>                                 38823
<NET-CHANGE-FROM-OPS>                                    252783
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  4550
<DISTRIBUTIONS-OF-GAINS>                                    280
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   34531
<NUMBER-OF-SHARES-REDEEMED>                               30163
<SHARES-REINVESTED>                                         448
<NET-CHANGE-IN-ASSETS>                                    52823
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    7032
<OVERDIST-NET-GAINS-PRIOR>                                 9405
<GROSS-ADVISORY-FEES>                                      7416
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           13984
<AVERAGE-NET-ASSETS>                                      76813
<PER-SHARE-NAV-BEGIN>                                      9.98
<PER-SHARE-NII>                                            0.60
<PER-SHARE-GAIN-APPREC>                                    0.23
<PER-SHARE-DIVIDEND>                                       0.60
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.18
<EXPENSE-RATIO>                                            0.90
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 034
  <NAME> LOW DURATION FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   4106489
<INVESTMENTS-AT-VALUE>                                  4129223
<RECEIVABLES>                                            137930
<ASSETS-OTHER>                                             1823
<OTHER-ITEMS-ASSETS>                                        826
<TOTAL-ASSETS>                                          4269802
<PAYABLE-FOR-SECURITIES>                                1247421
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 20743
<TOTAL-LIABILITIES>                                     1268164
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2975977
<SHARES-COMMON-STOCK>                                      1732
<SHARES-COMMON-PRIOR>                                       531
<ACCUMULATED-NII-CURRENT>                                   736
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     16
<ACCUM-APPREC-OR-DEPREC>                                  24941
<NET-ASSETS>                                            3001638
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                        202520
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            13984
<NET-INVESTMENT-INCOME>                                  188536
<REALIZED-GAINS-CURRENT>                                  25424
<APPREC-INCREASE-CURRENT>                                 38823
<NET-CHANGE-FROM-OPS>                                    252783
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   490
<DISTRIBUTIONS-OF-GAINS>                                     34
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    1705
<NUMBER-OF-SHARES-REDEEMED>                                 542
<SHARES-REINVESTED>                                          38
<NET-CHANGE-IN-ASSETS>                                    52823
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    7032
<OVERDIST-NET-GAINS-PRIOR>                                 9405
<GROSS-ADVISORY-FEES>                                      7416
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           13984
<AVERAGE-NET-ASSETS>                                       9670
<PER-SHARE-NAV-BEGIN>                                      9.98
<PER-SHARE-NII>                                            0.53
<PER-SHARE-GAIN-APPREC>                                    0.22
<PER-SHARE-DIVIDEND>                                       0.52
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.18
<EXPENSE-RATIO>                                            1.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 035
  <NAME> LOW DURATION FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                   4106489
<INVESTMENTS-AT-VALUE>                                  4129223
<RECEIVABLES>                                            137930
<ASSETS-OTHER>                                             1823
<OTHER-ITEMS-ASSETS>                                        826
<TOTAL-ASSETS>                                          4269802
<PAYABLE-FOR-SECURITIES>                                1247421
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 20743
<TOTAL-LIABILITIES>                                     1268164
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                2975977
<SHARES-COMMON-STOCK>                                      6756
<SHARES-COMMON-PRIOR>                                      6372
<ACCUMULATED-NII-CURRENT>                                   736
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     16
<ACCUM-APPREC-OR-DEPREC>                                  24941
<NET-ASSETS>                                            3001638
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                        202520
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            13984
<NET-INVESTMENT-INCOME>                                  188536
<REALIZED-GAINS-CURRENT>                                  25424
<APPREC-INCREASE-CURRENT>                                 38823
<NET-CHANGE-FROM-OPS>                                    252783
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  3349
<DISTRIBUTIONS-OF-GAINS>                                    182
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    5739
<NUMBER-OF-SHARES-REDEEMED>                                5625
<SHARES-REINVESTED>                                         271
<NET-CHANGE-IN-ASSETS>                                    52823
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    7032
<OVERDIST-NET-GAINS-PRIOR>                                 9405
<GROSS-ADVISORY-FEES>                                      7416
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           13984
<AVERAGE-NET-ASSETS>                                      61776
<PER-SHARE-NAV-BEGIN>                                      9.98
<PER-SHARE-NII>                                            0.55
<PER-SHARE-GAIN-APPREC>                                    0.23
<PER-SHARE-DIVIDEND>                                       0.55
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.18
<EXPENSE-RATIO>                                            1.40
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 141
  <NAME> LOW DURATION FUND II-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    761865
<INVESTMENTS-AT-VALUE>                                   763529
<RECEIVABLES>                                            122622
<ASSETS-OTHER>                                              211
<OTHER-ITEMS-ASSETS>                                          0
<TOTAL-ASSETS>                                           886362
<PAYABLE-FOR-SECURITIES>                                 484770
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   332
<TOTAL-LIABILITIES>                                      485102
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 399669
<SHARES-COMMON-STOCK>                                     40122
<SHARES-COMMON-PRIOR>                                     34577
<ACCUMULATED-NII-CURRENT>                                    48
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    298
<ACCUM-APPREC-OR-DEPREC>                                   1841
<NET-ASSETS>                                             401260
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22667
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1747
<NET-INVESTMENT-INCOME>                                   20920
<REALIZED-GAINS-CURRENT>                                   2785
<APPREC-INCREASE-CURRENT>                                  3943
<NET-CHANGE-FROM-OPS>                                     27648
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 20920
<DISTRIBUTIONS-OF-GAINS>                                    575
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   17716
<NUMBER-OF-SHARES-REDEEMED>                               14185
<SHARES-REINVESTED>                                        2014
<NET-CHANGE-IN-ASSETS>                                    61885
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    1272
<OVERDIST-NET-GAINS-PRIOR>                                 1187
<GROSS-ADVISORY-FEES>                                       870
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1747
<AVERAGE-NET-ASSETS>                                     349116
<PER-SHARE-NAV-BEGIN>                                      9.81
<PER-SHARE-NII>                                            0.22
<PER-SHARE-GAIN-APPREC>                                    0.59
<PER-SHARE-DIVIDEND>                                       0.60
<PER-SHARE-DISTRIBUTIONS>                                  0.02
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.00
<EXPENSE-RATIO>                                            0.50
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 142
  <NAME> LOW DURATION FUND II-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    761865
<INVESTMENTS-AT-VALUE>                                   763529
<RECEIVABLES>                                            122622
<ASSETS-OTHER>                                              211
<OTHER-ITEMS-ASSETS>                                          0
<TOTAL-ASSETS>                                           886362
<PAYABLE-FOR-SECURITIES>                                 484770
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   332
<TOTAL-LIABILITIES>                                      485102
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 399669
<SHARES-COMMON-STOCK>                                         6
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    48
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    298
<ACCUM-APPREC-OR-DEPREC>                                   1841
<NET-ASSETS>                                             401260
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         22667
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1747
<NET-INVESTMENT-INCOME>                                   20920
<REALIZED-GAINS-CURRENT>                                   2785
<APPREC-INCREASE-CURRENT>                                  3943
<NET-CHANGE-FROM-OPS>                                     27648
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                     1
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                       7
<NUMBER-OF-SHARES-REDEEMED>                                   2
<SHARES-REINVESTED>                                           0
<NET-CHANGE-IN-ASSETS>                                    61885
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    1272
<OVERDIST-NET-GAINS-PRIOR>                                 1187
<GROSS-ADVISORY-FEES>                                       870
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1747
<AVERAGE-NET-ASSETS>                                         48
<PER-SHARE-NAV-BEGIN>                                     10.03
<PER-SHARE-NII>                                            0.14
<PER-SHARE-GAIN-APPREC>                                   (0.08)
<PER-SHARE-DIVIDEND>                                       0.09
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.00
<EXPENSE-RATIO>                                            0.75
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 101
  <NAME> LOW DURATION FUND III-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     29950
<INVESTMENTS-AT-VALUE>                                    30011
<RECEIVABLES>                                               116
<ASSETS-OTHER>                                                5
<OTHER-ITEMS-ASSETS>                                          1
<TOTAL-ASSETS>                                            30133
<PAYABLE-FOR-SECURITIES>                                   6225
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                    12
<TOTAL-LIABILITIES>                                        6237
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  23834
<SHARES-COMMON-STOCK>                                      2377
<SHARES-COMMON-PRIOR>                                      1015
<ACCUMULATED-NII-CURRENT>                                    22
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     13
<ACCUM-APPREC-OR-DEPREC>                                     53
<NET-ASSETS>                                              23896
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           849
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               66
<NET-INVESTMENT-INCOME>                                     783
<REALIZED-GAINS-CURRENT>                                     74
<APPREC-INCREASE-CURRENT>                                   114
<NET-CHANGE-FROM-OPS>                                       971
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   783
<DISTRIBUTIONS-OF-GAINS>                                     33
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    1281
<NUMBER-OF-SHARES-REDEEMED>                                   0
<SHARES-REINVESTED>                                          81
<NET-CHANGE-IN-ASSETS>                                    13840
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       5
<OVERDIST-NET-GAINS-PRIOR>                                   27
<GROSS-ADVISORY-FEES>                                        33
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              66
<AVERAGE-NET-ASSETS>                                      12951
<PER-SHARE-NAV-BEGIN>                                      9.91
<PER-SHARE-NII>                                            0.53
<PER-SHARE-GAIN-APPREC>                                    0.24
<PER-SHARE-DIVIDEND>                                       0.60
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.05
<EXPENSE-RATIO>                                            0.50
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 221
  <NAME> LOW DURATION MORTGAGE FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                      6267
<INVESTMENTS-AT-VALUE>                                     6295
<RECEIVABLES>                                              1479
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                          1
<TOTAL-ASSETS>                                             7775
<PAYABLE-FOR-SECURITIES>                                   2655
<SENIOR-LONG-TERM-DEBT>                                    1356
<OTHER-ITEMS-LIABILITIES>                                    16
<TOTAL-LIABILITIES>                                        4027
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   3705
<SHARES-COMMON-STOCK>                                       370
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    15
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                     28
<NET-ASSETS>                                               3748
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           208
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               58
<NET-INVESTMENT-INCOME>                                     150
<REALIZED-GAINS-CURRENT>                                     25
<APPREC-INCREASE-CURRENT>                                    27
<NET-CHANGE-FROM-OPS>                                       202
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   150
<DISTRIBUTIONS-OF-GAINS>                                      9
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     355
<NUMBER-OF-SHARES-REDEEMED>                                   1
<SHARES-REINVESTED>                                          16
<NET-CHANGE-IN-ASSETS>                                     3748
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                         6
<INTEREST-EXPENSE>                                           46
<GROSS-EXPENSE>                                              58
<AVERAGE-NET-ASSETS>                                       3565
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.43
<PER-SHARE-GAIN-APPREC>                                    0.14
<PER-SHARE-DIVIDEND>                                       0.42
<PER-SHARE-DISTRIBUTIONS>                                  0.02
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.13
<EXPENSE-RATIO>                                            1.81
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 181
  <NAME> MODERATE DURATION FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    293657
<INVESTMENTS-AT-VALUE>                                   295152
<RECEIVABLES>                                             28529
<ASSETS-OTHER>                                               31
<OTHER-ITEMS-ASSETS>                                       1102
<TOTAL-ASSETS>                                           324814
<PAYABLE-FOR-SECURITIES>                                  85143
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   519
<TOTAL-LIABILITIES>                                       85662
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 237823
<SHARES-COMMON-STOCK>                                     23580
<SHARES-COMMON-PRIOR>                                      1369
<ACCUMULATED-NII-CURRENT>                                   560
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                    198
<ACCUM-APPREC-OR-DEPREC>                                    967
<NET-ASSETS>                                             239152
<DIVIDEND-INCOME>                                           183
<INTEREST-INCOME>                                          7439
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              532
<NET-INVESTMENT-INCOME>                                    7090
<REALIZED-GAINS-CURRENT>                                    928
<APPREC-INCREASE-CURRENT>                                  1131
<NET-CHANGE-FROM-OPS>                                      9149
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  7094
<DISTRIBUTIONS-OF-GAINS>                                    565
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   22490
<NUMBER-OF-SHARES-REDEEMED>                                 881
<SHARES-REINVESTED>                                         602
<NET-CHANGE-IN-ASSETS>                                   225694
<ACCUMULATED-NII-PRIOR>                                       2
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                   13
<GROSS-ADVISORY-FEES>                                       294
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             532
<AVERAGE-NET-ASSETS>                                     116736
<PER-SHARE-NAV-BEGIN>                                      9.83
<PER-SHARE-NII>                                            0.38
<PER-SHARE-GAIN-APPREC>                                    0.56
<PER-SHARE-DIVIDEND>                                       0.60
<PER-SHARE-DISTRIBUTIONS>                                  0.03
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.14
<EXPENSE-RATIO>                                            0.45
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 151
  <NAME> MONEY MARKET FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    195575
<INVESTMENTS-AT-VALUE>                                   195575
<RECEIVABLES>                                             20809
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        201
<TOTAL-ASSETS>                                           216585
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 60493
<TOTAL-LIABILITIES>                                       60493
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 156072
<SHARES-COMMON-STOCK>                                     55336
<SHARES-COMMON-PRIOR>                                     23497
<ACCUMULATED-NII-CURRENT>                                    20
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                      0
<NET-ASSETS>                                             156092
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          7811
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              759
<NET-INVESTMENT-INCOME>                                    7052
<REALIZED-GAINS-CURRENT>                                      0
<APPREC-INCREASE-CURRENT>                                     0
<NET-CHANGE-FROM-OPS>                                      7052
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  1933
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                  126866
<NUMBER-OF-SHARES-REDEEMED>                               96437
<SHARES-REINVESTED>                                        1408
<NET-CHANGE-IN-ASSETS>                                      453
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       205
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             759
<AVERAGE-NET-ASSETS>                                      36531
<PER-SHARE-NAV-BEGIN>                                      1.00
<PER-SHARE-NII>                                            0.05
<PER-SHARE-GAIN-APPREC>                                    0.00
<PER-SHARE-DIVIDEND>                                       0.05
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        1.00
<EXPENSE-RATIO>                                            0.35
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 152
  <NAME> MONEY MARKET FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    195575
<INVESTMENTS-AT-VALUE>                                   195575
<RECEIVABLES>                                             20809
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        201
<TOTAL-ASSETS>                                           216585
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 60493
<TOTAL-LIABILITIES>                                       60493
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 156072
<SHARES-COMMON-STOCK>                                       749
<SHARES-COMMON-PRIOR>                                        12
<ACCUMULATED-NII-CURRENT>                                    20
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                      0
<NET-ASSETS>                                             156092
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          7811
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              759
<NET-INVESTMENT-INCOME>                                    7052
<REALIZED-GAINS-CURRENT>                                      0
<APPREC-INCREASE-CURRENT>                                     0
<NET-CHANGE-FROM-OPS>                                      7052
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                    15
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    1317
<NUMBER-OF-SHARES-REDEEMED>                                 594
<SHARES-REINVESTED>                                          15
<NET-CHANGE-IN-ASSETS>                                      453
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       205
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             759
<AVERAGE-NET-ASSETS>                                        263
<PER-SHARE-NAV-BEGIN>                                      1.00
<PER-SHARE-NII>                                            0.05
<PER-SHARE-GAIN-APPREC>                                    0.00
<PER-SHARE-DIVIDEND>                                       0.05
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        1.00
<EXPENSE-RATIO>                                            0.60
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 153
  <NAME> MONEY MARKET FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    195575
<INVESTMENTS-AT-VALUE>                                   195575
<RECEIVABLES>                                             20809
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        201
<TOTAL-ASSETS>                                           216585
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 60493
<TOTAL-LIABILITIES>                                       60493
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 156072
<SHARES-COMMON-STOCK>                                     41376
<SHARES-COMMON-PRIOR>                                     43589
<ACCUMULATED-NII-CURRENT>                                    20
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                      0
<NET-ASSETS>                                             156092
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          7811
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              759
<NET-INVESTMENT-INCOME>                                    7052
<REALIZED-GAINS-CURRENT>                                      0
<APPREC-INCREASE-CURRENT>                                     0
<NET-CHANGE-FROM-OPS>                                      7052
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  1971
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                 1983452
<NUMBER-OF-SHARES-REDEEMED>                             1986890
<SHARES-REINVESTED>                                        1226
<NET-CHANGE-IN-ASSETS>                                      453
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       205
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             759
<AVERAGE-NET-ASSETS>                                      37459
<PER-SHARE-NAV-BEGIN>                                      1.00
<PER-SHARE-NII>                                            0.05
<PER-SHARE-GAIN-APPREC>                                    0.00
<PER-SHARE-DIVIDEND>                                       0.05
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        1.00
<EXPENSE-RATIO>                                            0.60
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 154
  <NAME> MONEY MARKET FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    195575
<INVESTMENTS-AT-VALUE>                                   195575
<RECEIVABLES>                                             20809
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        201
<TOTAL-ASSETS>                                           216585
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 60493
<TOTAL-LIABILITIES>                                       60493
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 156072
<SHARES-COMMON-STOCK>                                      2937
<SHARES-COMMON-PRIOR>                                      3143
<ACCUMULATED-NII-CURRENT>                                    20
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                      0
<NET-ASSETS>                                             156092
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          7811
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              759
<NET-INVESTMENT-INCOME>                                    7052
<REALIZED-GAINS-CURRENT>                                      0
<APPREC-INCREASE-CURRENT>                                     0
<NET-CHANGE-FROM-OPS>                                      7052
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   115
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   14945
<NUMBER-OF-SHARES-REDEEMED>                               15245
<SHARES-REINVESTED>                                          94
<NET-CHANGE-IN-ASSETS>                                      453
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       205
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             759
<AVERAGE-NET-ASSETS>                                       2851
<PER-SHARE-NAV-BEGIN>                                      1.00
<PER-SHARE-NII>                                            0.04
<PER-SHARE-GAIN-APPREC>                                    0.00
<PER-SHARE-DIVIDEND>                                       0.04
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        1.00
<EXPENSE-RATIO>                                            1.50
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 155
  <NAME> MONEY MARKET FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    195575
<INVESTMENTS-AT-VALUE>                                   195575
<RECEIVABLES>                                             20809
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                        201
<TOTAL-ASSETS>                                           216585
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 60493
<TOTAL-LIABILITIES>                                       60493
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 156072
<SHARES-COMMON-STOCK>                                     55697
<SHARES-COMMON-PRIOR>                                     85398
<ACCUMULATED-NII-CURRENT>                                    20
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                      0
<NET-ASSETS>                                             156092
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                          7811
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              759
<NET-INVESTMENT-INCOME>                                    7052
<REALIZED-GAINS-CURRENT>                                      0
<APPREC-INCREASE-CURRENT>                                     0
<NET-CHANGE-FROM-OPS>                                      7052
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  3021
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                 1189852
<NUMBER-OF-SHARES-REDEEMED>                             1221867
<SHARES-REINVESTED>                                        2314
<NET-CHANGE-IN-ASSETS>                                      453
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       205
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             759
<AVERAGE-NET-ASSETS>                                      57384
<PER-SHARE-NAV-BEGIN>                                      1.00
<PER-SHARE-NII>                                            0.05
<PER-SHARE-GAIN-APPREC>                                    0.00
<PER-SHARE-DIVIDEND>                                       0.05
<PER-SHARE-DISTRIBUTIONS>                                  0.00
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        1.00
<EXPENSE-RATIO>                                            0.60
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 071
  <NAME> REAL RETURN BOND FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     14124
<INVESTMENTS-AT-VALUE>                                    13958
<RECEIVABLES>                                                61
<ASSETS-OTHER>                                                7
<OTHER-ITEMS-ASSETS>                                          2
<TOTAL-ASSETS>                                            14028
<PAYABLE-FOR-SECURITIES>                                   6082
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                    64
<TOTAL-LIABILITIES>                                        6146
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   8022
<SHARES-COMMON-STOCK>                                       566
<SHARES-COMMON-PRIOR>                                       568
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                       25
<ACCUMULATED-NET-GAINS>                                       6
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   (121)
<NET-ASSETS>                                               7882
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           376
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               59
<NET-INVESTMENT-INCOME>                                     317
<REALIZED-GAINS-CURRENT>                                     52
<APPREC-INCREASE-CURRENT>                                   (21)
<NET-CHANGE-FROM-OPS>                                       348
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   266
<DISTRIBUTIONS-OF-GAINS>                                     68
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     465
<NUMBER-OF-SHARES-REDEEMED>                                 501
<SHARES-REINVESTED>                                          34
<NET-CHANGE-IN-ASSETS>                                     1586
<ACCUMULATED-NII-PRIOR>                                      19
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    1
<GROSS-ADVISORY-FEES>                                        19
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              59
<AVERAGE-NET-ASSETS>                                       5469
<PER-SHARE-NAV-BEGIN>                                      9.93
<PER-SHARE-NII>                                            0.44
<PER-SHARE-GAIN-APPREC>                                    0.05
<PER-SHARE-DIVIDEND>                                       0.51
<PER-SHARE-DISTRIBUTIONS>                                  0.14
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.77
<EXPENSE-RATIO>                                            0.52
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 073
  <NAME> REAL RETURN BOND FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     14124
<INVESTMENTS-AT-VALUE>                                    13958
<RECEIVABLES>                                                61
<ASSETS-OTHER>                                                7
<OTHER-ITEMS-ASSETS>                                          2
<TOTAL-ASSETS>                                            14028
<PAYABLE-FOR-SECURITIES>                                   6082
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                    64
<TOTAL-LIABILITIES>                                        6146
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   8022
<SHARES-COMMON-STOCK>                                        38
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                       25
<ACCUMULATED-NET-GAINS>                                       6
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   (121)
<NET-ASSETS>                                               7882
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           376
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               59
<NET-INVESTMENT-INCOME>                                     317
<REALIZED-GAINS-CURRENT>                                     52
<APPREC-INCREASE-CURRENT>                                   (21)
<NET-CHANGE-FROM-OPS>                                       348
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                    19
<DISTRIBUTIONS-OF-GAINS>                                      6
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     118
<NUMBER-OF-SHARES-REDEEMED>                                  83
<SHARES-REINVESTED>                                           2
<NET-CHANGE-IN-ASSETS>                                     1586
<ACCUMULATED-NII-PRIOR>                                      19
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    1
<GROSS-ADVISORY-FEES>                                        19
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              59
<AVERAGE-NET-ASSETS>                                        415
<PER-SHARE-NAV-BEGIN>                                      9.93
<PER-SHARE-NII>                                            0.40
<PER-SHARE-GAIN-APPREC>                                    0.03
<PER-SHARE-DIVIDEND>                                       0.45
<PER-SHARE-DISTRIBUTIONS>                                  0.14
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.77
<EXPENSE-RATIO>                                            0.92
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 074
  <NAME> REAL RETURN BOND FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     14124
<INVESTMENTS-AT-VALUE>                                    13958
<RECEIVABLES>                                                61
<ASSETS-OTHER>                                                7
<OTHER-ITEMS-ASSETS>                                          2
<TOTAL-ASSETS>                                            14028
<PAYABLE-FOR-SECURITIES>                                   6082
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                    64
<TOTAL-LIABILITIES>                                        6146
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   8022
<SHARES-COMMON-STOCK>                                       153
<SHARES-COMMON-PRIOR>                                        51
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                       25
<ACCUMULATED-NET-GAINS>                                       6
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   (121)
<NET-ASSETS>                                               7882
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           376
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               59
<NET-INVESTMENT-INCOME>                                     317
<REALIZED-GAINS-CURRENT>                                     52
<APPREC-INCREASE-CURRENT>                                   (21)
<NET-CHANGE-FROM-OPS>                                       348
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                    34
<DISTRIBUTIONS-OF-GAINS>                                     14
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     131
<NUMBER-OF-SHARES-REDEEMED>                                  32
<SHARES-REINVESTED>                                           3
<NET-CHANGE-IN-ASSETS>                                     1586
<ACCUMULATED-NII-PRIOR>                                      19
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    1
<GROSS-ADVISORY-FEES>                                        19
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              59
<AVERAGE-NET-ASSETS>                                        985
<PER-SHARE-NAV-BEGIN>                                      9.93
<PER-SHARE-NII>                                            0.33
<PER-SHARE-GAIN-APPREC>                                    0.03
<PER-SHARE-DIVIDEND>                                       0.38
<PER-SHARE-DISTRIBUTIONS>                                  0.14
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.77
<EXPENSE-RATIO>                                            1.67
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 075
  <NAME> REAL RETURN BOND FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     14124
<INVESTMENTS-AT-VALUE>                                    13958
<RECEIVABLES>                                                61
<ASSETS-OTHER>                                                7
<OTHER-ITEMS-ASSETS>                                          2
<TOTAL-ASSETS>                                            14028
<PAYABLE-FOR-SECURITIES>                                   6082
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                    64
<TOTAL-LIABILITIES>                                        6146
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   8022
<SHARES-COMMON-STOCK>                                        50
<SHARES-COMMON-PRIOR>                                        15
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                       25
<ACCUMULATED-NET-GAINS>                                       6
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   (121)
<NET-ASSETS>                                               7882
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           376
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               59
<NET-INVESTMENT-INCOME>                                     317
<REALIZED-GAINS-CURRENT>                                     52
<APPREC-INCREASE-CURRENT>                                   (21)
<NET-CHANGE-FROM-OPS>                                       348
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                    23
<DISTRIBUTIONS-OF-GAINS>                                     11
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     114
<NUMBER-OF-SHARES-REDEEMED>                                  82
<SHARES-REINVESTED>                                           3
<NET-CHANGE-IN-ASSETS>                                     1586
<ACCUMULATED-NII-PRIOR>                                      19
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    1
<GROSS-ADVISORY-FEES>                                        19
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              59
<AVERAGE-NET-ASSETS>                                        581
<PER-SHARE-NAV-BEGIN>                                      9.93
<PER-SHARE-NII>                                            0.35
<PER-SHARE-GAIN-APPREC>                                    0.04
<PER-SHARE-DIVIDEND>                                       0.41
<PER-SHARE-DISTRIBUTIONS>                                  0.14
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.77
<EXPENSE-RATIO>                                            1.42
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 051
  <NAME> SHORT-TERM FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    212787
<INVESTMENTS-AT-VALUE>                                   213036
<RECEIVABLES>                                              4167
<ASSETS-OTHER>                                              117
<OTHER-ITEMS-ASSETS>                                        142
<TOTAL-ASSETS>                                           217462
<PAYABLE-FOR-SECURITIES>                                   5059
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2207
<TOTAL-LIABILITIES>                                        7266
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 208978
<SHARES-COMMON-STOCK>                                     17177
<SHARES-COMMON-PRIOR>                                     15648
<ACCUMULATED-NII-CURRENT>                                   741
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     85
<ACCUM-APPREC-OR-DEPREC>                                    562
<NET-ASSETS>                                             210196
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         12824
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              963
<NET-INVESTMENT-INCOME>                                   11861
<REALIZED-GAINS-CURRENT>                                    922
<APPREC-INCREASE-CURRENT>                                   455
<NET-CHANGE-FROM-OPS>                                     13238
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 10855
<DISTRIBUTIONS-OF-GAINS>                                    251
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   30985
<NUMBER-OF-SHARES-REDEEMED>                               30360
<SHARES-REINVESTED>                                         904
<NET-CHANGE-IN-ASSETS>                                    45162
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                   205
<OVERDISTRIB-NII-PRIOR>                                     208
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       487
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             963
<AVERAGE-NET-ASSETS>                                     175211
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.62
<PER-SHARE-GAIN-APPREC>                                    0.06
<PER-SHARE-DIVIDEND>                                       0.61
<PER-SHARE-DISTRIBUTIONS>                                  0.01
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.06
<EXPENSE-RATIO>                                            0.45
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 052
  <NAME> SHORT-TERM FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    212787
<INVESTMENTS-AT-VALUE>                                   213036
<RECEIVABLES>                                              4167
<ASSETS-OTHER>                                              117
<OTHER-ITEMS-ASSETS>                                        142
<TOTAL-ASSETS>                                           217462
<PAYABLE-FOR-SECURITIES>                                   5059
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2207
<TOTAL-LIABILITIES>                                        7266
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 208978
<SHARES-COMMON-STOCK>                                       512
<SHARES-COMMON-PRIOR>                                       451
<ACCUMULATED-NII-CURRENT>                                   741
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     85
<ACCUM-APPREC-OR-DEPREC>                                    562
<NET-ASSETS>                                             210196
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         12824
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              963
<NET-INVESTMENT-INCOME>                                   11861
<REALIZED-GAINS-CURRENT>                                    922
<APPREC-INCREASE-CURRENT>                                   455
<NET-CHANGE-FROM-OPS>                                     13238
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   243
<DISTRIBUTIONS-OF-GAINS>                                      7
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     458
<NUMBER-OF-SHARES-REDEEMED>                                 401
<SHARES-REINVESTED>                                           3
<NET-CHANGE-IN-ASSETS>                                    45162
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                   205
<OVERDISTRIB-NII-PRIOR>                                     208
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       487
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             963
<AVERAGE-NET-ASSETS>                                       4319
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.59
<PER-SHARE-GAIN-APPREC>                                    0.07
<PER-SHARE-DIVIDEND>                                       0.59
<PER-SHARE-DISTRIBUTIONS>                                  0.01
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.06
<EXPENSE-RATIO>                                            0.70
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 053
  <NAME> SHORT-TERM FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    212787
<INVESTMENTS-AT-VALUE>                                   213036
<RECEIVABLES>                                              4167
<ASSETS-OTHER>                                              117
<OTHER-ITEMS-ASSETS>                                        142
<TOTAL-ASSETS>                                           217462
<PAYABLE-FOR-SECURITIES>                                   5059
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2207
<TOTAL-LIABILITIES>                                        7266
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 208978
<SHARES-COMMON-STOCK>                                      2403
<SHARES-COMMON-PRIOR>                                       253
<ACCUMULATED-NII-CURRENT>                                   741
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     85
<ACCUM-APPREC-OR-DEPREC>                                    562
<NET-ASSETS>                                             210196
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         12824
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              963
<NET-INVESTMENT-INCOME>                                   11861
<REALIZED-GAINS-CURRENT>                                    922
<APPREC-INCREASE-CURRENT>                                   455
<NET-CHANGE-FROM-OPS>                                     13238
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   507
<DISTRIBUTIONS-OF-GAINS>                                     15
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    3832
<NUMBER-OF-SHARES-REDEEMED>                                1729
<SHARES-REINVESTED>                                          47
<NET-CHANGE-IN-ASSETS>                                    45162
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                   205
<OVERDISTRIB-NII-PRIOR>                                     208
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       487
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             963
<AVERAGE-NET-ASSETS>                                       9537
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.55
<PER-SHARE-GAIN-APPREC>                                    0.09
<PER-SHARE-DIVIDEND>                                       0.57
<PER-SHARE-DISTRIBUTIONS>                                  0.01
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.06
<EXPENSE-RATIO>                                            0.85
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 054
  <NAME> SHORT-TERM FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    212787
<INVESTMENTS-AT-VALUE>                                   213036
<RECEIVABLES>                                              4167
<ASSETS-OTHER>                                              117
<OTHER-ITEMS-ASSETS>                                        142
<TOTAL-ASSETS>                                           217462
<PAYABLE-FOR-SECURITIES>                                   5059
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2207
<TOTAL-LIABILITIES>                                        7266
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 208978
<SHARES-COMMON-STOCK>                                       125
<SHARES-COMMON-PRIOR>                                        11
<ACCUMULATED-NII-CURRENT>                                   741
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     85
<ACCUM-APPREC-OR-DEPREC>                                    562
<NET-ASSETS>                                             210196
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         12824
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              963
<NET-INVESTMENT-INCOME>                                   11861
<REALIZED-GAINS-CURRENT>                                    922
<APPREC-INCREASE-CURRENT>                                   455
<NET-CHANGE-FROM-OPS>                                     13238
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                    38
<DISTRIBUTIONS-OF-GAINS>                                      1
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     610
<NUMBER-OF-SHARES-REDEEMED>                                 497
<SHARES-REINVESTED>                                           1
<NET-CHANGE-IN-ASSETS>                                    45162
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                   205
<OVERDISTRIB-NII-PRIOR>                                     208
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       487
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             963
<AVERAGE-NET-ASSETS>                                        717
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.50
<PER-SHARE-GAIN-APPREC>                                    0.08
<PER-SHARE-DIVIDEND>                                       0.51
<PER-SHARE-DISTRIBUTIONS>                                  0.01
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.06
<EXPENSE-RATIO>                                            1.60
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 055
  <NAME> SHORT-TERM FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    212787
<INVESTMENTS-AT-VALUE>                                   213036
<RECEIVABLES>                                              4167
<ASSETS-OTHER>                                              117
<OTHER-ITEMS-ASSETS>                                        142
<TOTAL-ASSETS>                                           217462
<PAYABLE-FOR-SECURITIES>                                   5059
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  2207
<TOTAL-LIABILITIES>                                        7266
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 208978
<SHARES-COMMON-STOCK>                                       672
<SHARES-COMMON-PRIOR>                                       136
<ACCUMULATED-NII-CURRENT>                                   741
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                     85
<ACCUM-APPREC-OR-DEPREC>                                    562
<NET-ASSETS>                                             210196
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         12824
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              963
<NET-INVESTMENT-INCOME>                                   11861
<REALIZED-GAINS-CURRENT>                                    922
<APPREC-INCREASE-CURRENT>                                   455
<NET-CHANGE-FROM-OPS>                                     13238
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   219
<DISTRIBUTIONS-OF-GAINS>                                      9
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     991
<NUMBER-OF-SHARES-REDEEMED>                                 474
<SHARES-REINVESTED>                                          19
<NET-CHANGE-IN-ASSETS>                                    45162
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                   205
<OVERDISTRIB-NII-PRIOR>                                     208
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       487
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             963
<AVERAGE-NET-ASSETS>                                       4113
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.54
<PER-SHARE-GAIN-APPREC>                                    0.07
<PER-SHARE-DIVIDEND>                                       0.54
<PER-SHARE-DISTRIBUTIONS>                                  0.01
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.06
<EXPENSE-RATIO>                                            1.15
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 061
  <NAME> STOCKSPLUS FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    664639
<INVESTMENTS-AT-VALUE>                                   664637
<RECEIVABLES>                                             18117
<ASSETS-OTHER>                                              200
<OTHER-ITEMS-ASSETS>                                       1629
<TOTAL-ASSETS>                                           684583
<PAYABLE-FOR-SECURITIES>                                   5139
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1732
<TOTAL-LIABILITIES>                                        6871
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 591465
<SHARES-COMMON-STOCK>                                     29564
<SHARES-COMMON-PRIOR>                                     20574
<ACCUMULATED-NII-CURRENT>                                 43808
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   31583
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  10856
<NET-ASSETS>                                             677712
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         69130
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             4232
<NET-INVESTMENT-INCOME>                                   64898
<REALIZED-GAINS-CURRENT>                                  85623
<APPREC-INCREASE-CURRENT>                                 21299
<NET-CHANGE-FROM-OPS>                                    171820
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 35277
<DISTRIBUTIONS-OF-GAINS>                                  25683
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   16854
<NUMBER-OF-SHARES-REDEEMED>                               12110
<SHARES-REINVESTED>                                        4247
<NET-CHANGE-IN-ASSETS>                                   415876
<ACCUMULATED-NII-PRIOR>                                    2028
<ACCUMULATED-GAINS-PRIOR>                                 11988
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                      1919
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            4232
<AVERAGE-NET-ASSETS>                                     340274
<PER-SHARE-NAV-BEGIN>                                     11.46
<PER-SHARE-NII>                                            1.90
<PER-SHARE-GAIN-APPREC>                                    3.23
<PER-SHARE-DIVIDEND>                                       1.41
<PER-SHARE-DISTRIBUTIONS>                                  1.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       14.09
<EXPENSE-RATIO>                                            0.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 062
  <NAME> STOCKSPLUS FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    664639
<INVESTMENTS-AT-VALUE>                                   664637
<RECEIVABLES>                                             18117
<ASSETS-OTHER>                                              200
<OTHER-ITEMS-ASSETS>                                       1629
<TOTAL-ASSETS>                                           684583
<PAYABLE-FOR-SECURITIES>                                   5139
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1732
<TOTAL-LIABILITIES>                                        6871
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 591465
<SHARES-COMMON-STOCK>                                       152
<SHARES-COMMON-PRIOR>                                        60
<ACCUMULATED-NII-CURRENT>                                 43808
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   31583
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  10856
<NET-ASSETS>                                             677712
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         69130
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             4232
<NET-INVESTMENT-INCOME>                                   64898
<REALIZED-GAINS-CURRENT>                                  85623
<APPREC-INCREASE-CURRENT>                                 21299
<NET-CHANGE-FROM-OPS>                                    171820
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   126
<DISTRIBUTIONS-OF-GAINS>                                     96
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                      98
<NUMBER-OF-SHARES-REDEEMED>                                  22
<SHARES-REINVESTED>                                          17
<NET-CHANGE-IN-ASSETS>                                   415876
<ACCUMULATED-NII-PRIOR>                                    2028
<ACCUMULATED-GAINS-PRIOR>                                 11988
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                      1919
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            4232
<AVERAGE-NET-ASSETS>                                       1191
<PER-SHARE-NAV-BEGIN>                                     11.46
<PER-SHARE-NII>                                            1.89
<PER-SHARE-GAIN-APPREC>                                    3.19
<PER-SHARE-DIVIDEND>                                       1.39
<PER-SHARE-DISTRIBUTIONS>                                  1.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       14.06
<EXPENSE-RATIO>                                            0.90
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 063
  <NAME> STOCKSPLUS FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    664639
<INVESTMENTS-AT-VALUE>                                   664637
<RECEIVABLES>                                             18117
<ASSETS-OTHER>                                              200
<OTHER-ITEMS-ASSETS>                                       1629
<TOTAL-ASSETS>                                           684583
<PAYABLE-FOR-SECURITIES>                                   5139
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1732
<TOTAL-LIABILITIES>                                        6871
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 591465
<SHARES-COMMON-STOCK>                                      4478
<SHARES-COMMON-PRIOR>                                       505
<ACCUMULATED-NII-CURRENT>                                 43808
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   31583
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  10856
<NET-ASSETS>                                             677712
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         69130
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             4232
<NET-INVESTMENT-INCOME>                                   64898
<REALIZED-GAINS-CURRENT>                                  85623
<APPREC-INCREASE-CURRENT>                                 21299
<NET-CHANGE-FROM-OPS>                                    171820
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  4008
<DISTRIBUTIONS-OF-GAINS>                                   3306
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    5189
<NUMBER-OF-SHARES-REDEEMED>                                1748
<SHARES-REINVESTED>                                         531
<NET-CHANGE-IN-ASSETS>                                   415876
<ACCUMULATED-NII-PRIOR>                                    2028
<ACCUMULATED-GAINS-PRIOR>                                 11988
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                      1919
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            4232
<AVERAGE-NET-ASSETS>                                      32569
<PER-SHARE-NAV-BEGIN>                                     11.46
<PER-SHARE-NII>                                            1.66
<PER-SHARE-GAIN-APPREC>                                    3.41
<PER-SHARE-DIVIDEND>                                       1.38
<PER-SHARE-DISTRIBUTIONS>                                  1.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       14.06
<EXPENSE-RATIO>                                            1.05
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 064
  <NAME> STOCKSPLUS FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    664639
<INVESTMENTS-AT-VALUE>                                   664637
<RECEIVABLES>                                             18117
<ASSETS-OTHER>                                              200
<OTHER-ITEMS-ASSETS>                                       1629
<TOTAL-ASSETS>                                           684583
<PAYABLE-FOR-SECURITIES>                                   5139
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1732
<TOTAL-LIABILITIES>                                        6871
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 591465
<SHARES-COMMON-STOCK>                                      7068
<SHARES-COMMON-PRIOR>                                       724
<ACCUMULATED-NII-CURRENT>                                 43808
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   31583
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  10856
<NET-ASSETS>                                             677712
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         69130
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             4232
<NET-INVESTMENT-INCOME>                                   64898
<REALIZED-GAINS-CURRENT>                                  85623
<APPREC-INCREASE-CURRENT>                                 21299
<NET-CHANGE-FROM-OPS>                                    171820
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  5278
<DISTRIBUTIONS-OF-GAINS>                                   4591
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    6014
<NUMBER-OF-SHARES-REDEEMED>                                 400
<SHARES-REINVESTED>                                         731
<NET-CHANGE-IN-ASSETS>                                   415876
<ACCUMULATED-NII-PRIOR>                                    2028
<ACCUMULATED-GAINS-PRIOR>                                 11988
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                      1919
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            4232
<AVERAGE-NET-ASSETS>                                      44573
<PER-SHARE-NAV-BEGIN>                                     11.44
<PER-SHARE-NII>                                            1.61
<PER-SHARE-GAIN-APPREC>                                    3.35
<PER-SHARE-DIVIDEND>                                       1.30
<PER-SHARE-DISTRIBUTIONS>                                  1.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       14.01
<EXPENSE-RATIO>                                            1.80
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 065
  <NAME> STOCKSPLUS FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    664639
<INVESTMENTS-AT-VALUE>                                   664637
<RECEIVABLES>                                             18117
<ASSETS-OTHER>                                              200
<OTHER-ITEMS-ASSETS>                                       1629
<TOTAL-ASSETS>                                           684583
<PAYABLE-FOR-SECURITIES>                                   5139
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                  1732
<TOTAL-LIABILITIES>                                        6871
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 591465
<SHARES-COMMON-STOCK>                                      6909
<SHARES-COMMON-PRIOR>                                       983
<ACCUMULATED-NII-CURRENT>                                 43808
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   31583
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                  10856
<NET-ASSETS>                                             677712
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         69130
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             4232
<NET-INVESTMENT-INCOME>                                   64898
<REALIZED-GAINS-CURRENT>                                  85623
<APPREC-INCREASE-CURRENT>                                 21299
<NET-CHANGE-FROM-OPS>                                    171820
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  5834
<DISTRIBUTIONS-OF-GAINS>                                   4963
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    6158
<NUMBER-OF-SHARES-REDEEMED>                                1049
<SHARES-REINVESTED>                                         816
<NET-CHANGE-IN-ASSETS>                                   415876
<ACCUMULATED-NII-PRIOR>                                    2028
<ACCUMULATED-GAINS-PRIOR>                                 11988
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                      1919
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            4232
<AVERAGE-NET-ASSETS>                                      49473
<PER-SHARE-NAV-BEGIN>                                     11.45
<PER-SHARE-NII>                                            1.64
<PER-SHARE-GAIN-APPREC>                                    3.35
<PER-SHARE-DIVIDEND>                                       1.32
<PER-SHARE-DISTRIBUTIONS>                                  1.09
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       14.03
<EXPENSE-RATIO>                                            1.55
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 201
  <NAME> STRATEGIC BALANCED FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                     37914
<INVESTMENTS-AT-VALUE>                                    38072
<RECEIVABLES>                                               698
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                         57
<TOTAL-ASSETS>                                            38827
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                    21
<TOTAL-LIABILITIES>                                          21
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                  34769
<SHARES-COMMON-STOCK>                                      3080
<SHARES-COMMON-PRIOR>                                      1003
<ACCUMULATED-NII-CURRENT>                                  2019
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                    1593
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                    425
<NET-ASSETS>                                              38806
<DIVIDEND-INCOME>                                             4
<INTEREST-INCOME>                                          3387
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                              191
<NET-INVESTMENT-INCOME>                                    3200
<REALIZED-GAINS-CURRENT>                                   3171
<APPREC-INCREASE-CURRENT>                                   630
<NET-CHANGE-FROM-OPS>                                      7001
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                  2495
<DISTRIBUTIONS-OF-GAINS>                                    811
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    2472
<NUMBER-OF-SHARES-REDEEMED>                                 448
<SHARES-REINVESTED>                                          53
<NET-CHANGE-IN-ASSETS>                                    28446
<ACCUMULATED-NII-PRIOR>                                     225
<ACCUMULATED-GAINS-PRIOR>                                   305
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                       118
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                             191
<AVERAGE-NET-ASSETS>                                      28932
<PER-SHARE-NAV-BEGIN>                                     10.32
<PER-SHARE-NII>                                            1.30
<PER-SHARE-GAIN-APPREC>                                    2.05
<PER-SHARE-DIVIDEND>                                       0.84
<PER-SHARE-DISTRIBUTIONS>                                  0.23
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       12.60
<EXPENSE-RATIO>                                            0.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 011
  <NAME> TOTAL RETURN FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                  21634433
<INVESTMENTS-AT-VALUE>                                 21746274
<RECEIVABLES>                                           2947062
<ASSETS-OTHER>                                             6179
<OTHER-ITEMS-ASSETS>                                      40257
<TOTAL-ASSETS>                                         24739772
<PAYABLE-FOR-SECURITIES>                                6604539
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 43522
<TOTAL-LIABILITIES>                                     6648061
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                               17814558
<SHARES-COMMON-STOCK>                                   1552606
<SHARES-COMMON-PRIOR>                                   1219656
<ACCUMULATED-NII-CURRENT>                                111760
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   40149
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                 125244
<NET-ASSETS>                                           18091711
<DIVIDEND-INCOME>                                          1329
<INTEREST-INCOME>                                        993323
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            73944
<NET-INVESTMENT-INCOME>                                  920708
<REALIZED-GAINS-CURRENT>                                 644154
<APPREC-INCREASE-CURRENT>                                196253
<NET-CHANGE-FROM-OPS>                                   1761115
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                866867
<DISTRIBUTIONS-OF-GAINS>                                 375236
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                  569689
<NUMBER-OF-SHARES-REDEEMED>                              333872
<SHARES-REINVESTED>                                       97133
<NET-CHANGE-IN-ASSETS>                                  4893005
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                   25279
<OVERDIST-NET-GAINS-PRIOR>                                63168
<GROSS-ADVISORY-FEES>                                     38328
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           73944
<AVERAGE-NET-ASSETS>                                   14260565
<PER-SHARE-NAV-BEGIN>                                     10.27
<PER-SHARE-NII>                                            0.64
<PER-SHARE-GAIN-APPREC>                                    0.62
<PER-SHARE-DIVIDEND>                                       0.64
<PER-SHARE-DISTRIBUTIONS>                                  0.27
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.62
<EXPENSE-RATIO>                                            0.43
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 012
  <NAME> TOTAL RETURN FUND-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                  21634433
<INVESTMENTS-AT-VALUE>                                 21746274
<RECEIVABLES>                                           2947062
<ASSETS-OTHER>                                             6179
<OTHER-ITEMS-ASSETS>                                      40257
<TOTAL-ASSETS>                                         24739772
<PAYABLE-FOR-SECURITIES>                                6604539
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 43522
<TOTAL-LIABILITIES>                                     6648061
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                               17814558
<SHARES-COMMON-STOCK>                                     45374
<SHARES-COMMON-PRIOR>                                     14719
<ACCUMULATED-NII-CURRENT>                                111760
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   40149
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                 125244
<NET-ASSETS>                                           18091711
<DIVIDEND-INCOME>                                          1329
<INTEREST-INCOME>                                        993323
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            73944
<NET-INVESTMENT-INCOME>                                  920708
<REALIZED-GAINS-CURRENT>                                 644154
<APPREC-INCREASE-CURRENT>                                196253
<NET-CHANGE-FROM-OPS>                                   1761115
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 15895
<DISTRIBUTIONS-OF-GAINS>                                   8344
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   39423
<NUMBER-OF-SHARES-REDEEMED>                               11009
<SHARES-REINVESTED>                                        2241
<NET-CHANGE-IN-ASSETS>                                  4893005
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                   25279
<OVERDIST-NET-GAINS-PRIOR>                                63168
<GROSS-ADVISORY-FEES>                                     38328
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           73944
<AVERAGE-NET-ASSETS>                                     276606
<PER-SHARE-NAV-BEGIN>                                     10.27
<PER-SHARE-NII>                                            0.61
<PER-SHARE-GAIN-APPREC>                                    0.63
<PER-SHARE-DIVIDEND>                                       0.62
<PER-SHARE-DISTRIBUTIONS>                                  0.27
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.62
<EXPENSE-RATIO>                                            0.68
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 013
  <NAME> TOTAL RETURN FUND-CLASS A
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                  21634433
<INVESTMENTS-AT-VALUE>                                 21746274
<RECEIVABLES>                                           2947062
<ASSETS-OTHER>                                             6179
<OTHER-ITEMS-ASSETS>                                      40257
<TOTAL-ASSETS>                                         24739772
<PAYABLE-FOR-SECURITIES>                                6604539
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                 43522
<TOTAL-LIABILITIES>                                     6648061
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                               17814558
<SHARES-COMMON-STOCK>                                     50287
<SHARES-COMMON-PRIOR>                                     11268
<ACCUMULATED-NII-CURRENT>                                111760
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                   40149
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                 125244
<NET-ASSETS>                                           18091711
<DIVIDEND-INCOME>                                          1329
<INTEREST-INCOME>                                        993323
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                            73944
<NET-INVESTMENT-INCOME>                                  920708
<REALIZED-GAINS-CURRENT>                                 644154
<APPREC-INCREASE-CURRENT>                                196253
<NET-CHANGE-FROM-OPS>                                   1761115
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 14859
<DISTRIBUTIONS-OF-GAINS>                                   8102
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   43181
<NUMBER-OF-SHARES-REDEEMED>                                6141
<SHARES-REINVESTED>                                        1979
<NET-CHANGE-IN-ASSETS>                                  4893005
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                   25279
<OVERDIST-NET-GAINS-PRIOR>                                63168
<GROSS-ADVISORY-FEES>                                     38328
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                           73944
<AVERAGE-NET-ASSETS>                                     272792
<PER-SHARE-NAV-BEGIN>                                     10.27
<PER-SHARE-NII>                                            0.58
<PER-SHARE-GAIN-APPREC>                                    0.63
<PER-SHARE-DIVIDEND>                                       0.59
<PER-SHARE-DISTRIBUTIONS>                                  0.27
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.62
<EXPENSE-RATIO>                                            0.90
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 014
  <NAME> TOTAL RETURN FUND-CLASS B
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                21,634,433
<INVESTMENTS-AT-VALUE>                               21,746,274
<RECEIVABLES>                                         2,947,062
<ASSETS-OTHER>                                            6,179
<OTHER-ITEMS-ASSETS>                                     40,257
<TOTAL-ASSETS>                                       24,739,772
<PAYABLE-FOR-SECURITIES>                              6,604,539
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                43,522
<TOTAL-LIABILITIES>                                   6,648,061
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                             17,814,558
<SHARES-COMMON-STOCK>                                    17,607
<SHARES-COMMON-PRIOR>                                     7,217
<ACCUMULATED-NII-CURRENT>                               111,760
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                  40,149
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                125,244
<NET-ASSETS>                                         18,091,711
<DIVIDEND-INCOME>                                         1,329
<INTEREST-INCOME>                                       993,323
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                           73,944
<NET-INVESTMENT-INCOME>                                 920,708
<REALIZED-GAINS-CURRENT>                                644,154
<APPREC-INCREASE-CURRENT>                               196,253
<NET-CHANGE-FROM-OPS>                                 1,761,115
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 5,460
<DISTRIBUTIONS-OF-GAINS>                                  3,479
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                  11,221
<NUMBER-OF-SHARES-REDEEMED>                               1,444
<SHARES-REINVESTED>                                         613
<NET-CHANGE-IN-ASSETS>                                4,893,005
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                  25,279
<OVERDIST-NET-GAINS-PRIOR>                               63,168
<GROSS-ADVISORY-FEES>                                    38,328
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                          73,944
<AVERAGE-NET-ASSETS>                                    116,566
<PER-SHARE-NAV-BEGIN>                                     10.27
<PER-SHARE-NII>                                            0.50
<PER-SHARE-GAIN-APPREC>                                    0.63
<PER-SHARE-DIVIDEND>                                       0.51
<PER-SHARE-DISTRIBUTIONS>                                  0.27
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.62
<EXPENSE-RATIO>                                            1.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 015
  <NAME> TOTAL RETURN FUND-CLASS C
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                21,634,433
<INVESTMENTS-AT-VALUE>                               21,746,274
<RECEIVABLES>                                         2,947,062
<ASSETS-OTHER>                                            6,179
<OTHER-ITEMS-ASSETS>                                     40,257
<TOTAL-ASSETS>                                       24,739,772
<PAYABLE-FOR-SECURITIES>                              6,604,539
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                43,522
<TOTAL-LIABILITIES>                                   6,648,061
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                             17,814,558
<SHARES-COMMON-STOCK>                                    38,151
<SHARES-COMMON-PRIOR>                                    32,039
<ACCUMULATED-NII-CURRENT>                               111,760
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                  40,149
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                125,244
<NET-ASSETS>                                         18,091,711
<DIVIDEND-INCOME>                                         1,329
<INTEREST-INCOME>                                       993,323
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                           73,944
<NET-INVESTMENT-INCOME>                                 920,708
<REALIZED-GAINS-CURRENT>                                644,154
<APPREC-INCREASE-CURRENT>                               196,253
<NET-CHANGE-FROM-OPS>                                 1,761,115
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                16,945
<DISTRIBUTIONS-OF-GAINS>                                  9,011
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                  14,063
<NUMBER-OF-SHARES-REDEEMED>                               9,698
<SHARES-REINVESTED>                                       1,747
<NET-CHANGE-IN-ASSETS>                                4,893,005
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                  25,279
<OVERDIST-NET-GAINS-PRIOR>                               63,168
<GROSS-ADVISORY-FEES>                                    38,328
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                          73,944
<AVERAGE-NET-ASSETS>                                    351,633
<PER-SHARE-NAV-BEGIN>                                     10.27
<PER-SHARE-NII>                                            0.51
<PER-SHARE-GAIN-APPREC>                                    0.63
<PER-SHARE-DIVIDEND>                                       0.52
<PER-SHARE-DISTRIBUTIONS>                                  0.27
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.62
<EXPENSE-RATIO>                                            1.65
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 161
  <NAME> TOTAL RETURN FUND II-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    703935
<INVESTMENTS-AT-VALUE>                                   710886
<RECEIVABLES>                                             51863
<ASSETS-OTHER>                                              301
<OTHER-ITEMS-ASSETS>                                          5
<TOTAL-ASSETS>                                           763055
<PAYABLE-FOR-SECURITIES>                                 172621
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   675
<TOTAL-LIABILITIES>                                      173296
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 579091
<SHARES-COMMON-STOCK>                                     56008
<SHARES-COMMON-PRIOR>                                     48599
<ACCUMULATED-NII-CURRENT>                                  2245
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                    2243
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   6180
<NET-ASSETS>                                             589759
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         30570
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             2335
<NET-INVESTMENT-INCOME>                                   28235
<REALIZED-GAINS-CURRENT>                                  16095
<APPREC-INCREASE-CURRENT>                                  7391
<NET-CHANGE-FROM-OPS>                                     51721
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 27728
<DISTRIBUTIONS-OF-GAINS>                                   5211
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   33950
<NUMBER-OF-SHARES-REDEEMED>                               29485
<SHARES-REINVESTED>                                        2944
<NET-CHANGE-IN-ASSETS>                                   106004
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    1503
<OVERDIST-NET-GAINS-PRIOR>                                 4780
<GROSS-ADVISORY-FEES>                                      1146
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            2335
<AVERAGE-NET-ASSETS>                                     456248
<PER-SHARE-NAV-BEGIN>                                      9.85
<PER-SHARE-NII>                                            0.63
<PER-SHARE-GAIN-APPREC>                                    0.52
<PER-SHARE-DIVIDEND>                                       0.63
<PER-SHARE-DISTRIBUTIONS>                                  0.11
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.26
<EXPENSE-RATIO>                                            0.50
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 162
  <NAME> TOTAL RETURN FUND II-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    703935
<INVESTMENTS-AT-VALUE>                                   710886
<RECEIVABLES>                                             51863
<ASSETS-OTHER>                                              301
<OTHER-ITEMS-ASSETS>                                          5
<TOTAL-ASSETS>                                           763055
<PAYABLE-FOR-SECURITIES>                                 172621
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   675
<TOTAL-LIABILITIES>                                      173296
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 579091
<SHARES-COMMON-STOCK>                                      1479
<SHARES-COMMON-PRIOR>                                       539
<ACCUMULATED-NII-CURRENT>                                  2245
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                    2243
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   6180
<NET-ASSETS>                                             589759
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         30570
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             2335
<NET-INVESTMENT-INCOME>                                   28235
<REALIZED-GAINS-CURRENT>                                  16095
<APPREC-INCREASE-CURRENT>                                  7391
<NET-CHANGE-FROM-OPS>                                     51721
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   536
<DISTRIBUTIONS-OF-GAINS>                                    104
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                    1005
<NUMBER-OF-SHARES-REDEEMED>                                 124
<SHARES-REINVESTED>                                          60
<NET-CHANGE-IN-ASSETS>                                   106004
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                    1503
<OVERDIST-NET-GAINS-PRIOR>                                 4780
<GROSS-ADVISORY-FEES>                                      1146
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            2335
<AVERAGE-NET-ASSETS>                                       8993
<PER-SHARE-NAV-BEGIN>                                      9.85
<PER-SHARE-NII>                                            0.60
<PER-SHARE-GAIN-APPREC>                                    0.52
<PER-SHARE-DIVIDEND>                                       0.60
<PER-SHARE-DISTRIBUTIONS>                                  0.11
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.26
<EXPENSE-RATIO>                                            0.75
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 091
  <NAME> TOTAL RETURN FUND III-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    423384
<INVESTMENTS-AT-VALUE>                                   426442
<RECEIVABLES>                                             45333
<ASSETS-OTHER>                                              128
<OTHER-ITEMS-ASSETS>                                          0
<TOTAL-ASSETS>                                           471903
<PAYABLE-FOR-SECURITIES>                                 105645
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   831
<TOTAL-LIABILITIES>                                      106476
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 360009
<SHARES-COMMON-STOCK>                                     38229
<SHARES-COMMON-PRIOR>                                     21130
<ACCUMULATED-NII-CURRENT>                                  1694
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     666
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   3058
<NET-ASSETS>                                             365427
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         18221
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1428
<NET-INVESTMENT-INCOME>                                   16793
<REALIZED-GAINS-CURRENT>                                  10981
<APPREC-INCREASE-CURRENT>                                  3433
<NET-CHANGE-FROM-OPS>                                     31207
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                 16763
<DISTRIBUTIONS-OF-GAINS>                                   5401
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                   16851
<NUMBER-OF-SHARES-REDEEMED>                                1903
<SHARES-REINVESTED>                                        2151
<NET-CHANGE-IN-ASSETS>                                   172130
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                     880
<OVERDIST-NET-GAINS-PRIOR>                                 2381
<GROSS-ADVISORY-FEES>                                       701
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1428
<AVERAGE-NET-ASSETS>                                     281286
<PER-SHARE-NAV-BEGIN>                                      9.15
<PER-SHARE-NII>                                            0.57
<PER-SHARE-GAIN-APPREC>                                    0.56
<PER-SHARE-DIVIDEND>                                       0.57
<PER-SHARE-DISTRIBUTIONS>                                  0.16
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.55
<EXPENSE-RATIO>                                            0.51
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the annual
report dated March 31, 1998 and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 092
  <NAME> TOTAL RETURN FUND III-ADMINISTRATIVE CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                    423384
<INVESTMENTS-AT-VALUE>                                   426442
<RECEIVABLES>                                             45333
<ASSETS-OTHER>                                              128
<OTHER-ITEMS-ASSETS>                                          0
<TOTAL-ASSETS>                                           471903
<PAYABLE-FOR-SECURITIES>                                 105645
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                   831
<TOTAL-LIABILITIES>                                      106476
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                 360009
<SHARES-COMMON-STOCK>                                        19
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                  1694
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                     666
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                   3058
<NET-ASSETS>                                             365427
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                         18221
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                             1428
<NET-INVESTMENT-INCOME>                                   16793
<REALIZED-GAINS-CURRENT>                                  10981
<APPREC-INCREASE-CURRENT>                                  3433
<NET-CHANGE-FROM-OPS>                                     31207
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                     7
<DISTRIBUTIONS-OF-GAINS>                                      2
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                      23
<NUMBER-OF-SHARES-REDEEMED>                                   4
<SHARES-REINVESTED>                                           0
<NET-CHANGE-IN-ASSETS>                                   172130
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                     880
<OVERDIST-NET-GAINS-PRIOR>                                 2381
<GROSS-ADVISORY-FEES>                                       701
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                            1428
<AVERAGE-NET-ASSETS>                                        136
<PER-SHARE-NAV-BEGIN>                                      9.12
<PER-SHARE-NII>                                            0.54
<PER-SHARE-GAIN-APPREC>                                    0.58
<PER-SHARE-DIVIDEND>                                       0.53
<PER-SHARE-DISTRIBUTIONS>                                  0.16
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                        9.55
<EXPENSE-RATIO>                                            0.76
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the
annual report dated March 31, 1998 and is qualified in its entirety by reference
to such financial statements.
</LEGEND>
<SERIES>
  <NUMBER> 211
  <NAME> TOTAL RETURN MORTGAGE FUND-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
       
<S>                                                 <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                                   MAR-31-1998
<PERIOD-END>                                        MAR-31-1998
<INVESTMENTS-AT-COST>                                      4357
<INVESTMENTS-AT-VALUE>                                     4416
<RECEIVABLES>                                              1689
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                          0
<TOTAL-ASSETS>                                             6105
<PAYABLE-FOR-SECURITIES>                                   2515
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                     2
<TOTAL-LIABILITIES>                                        2517
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                   3507
<SHARES-COMMON-STOCK>                                       350
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                    25
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      5
<ACCUM-APPREC-OR-DEPREC>                                     61
<NET-ASSETS>                                               3588
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                           152
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                               12
<NET-INVESTMENT-INCOME>                                     140
<REALIZED-GAINS-CURRENT>                                     22
<APPREC-INCREASE-CURRENT>                                    61
<NET-CHANGE-FROM-OPS>                                       223
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                   140
<DISTRIBUTIONS-OF-GAINS>                                      2
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                     336
<NUMBER-OF-SHARES-REDEEMED>                                   0
<SHARES-REINVESTED>                                          14
<NET-CHANGE-IN-ASSETS>                                     3588
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                         6
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                              12
<AVERAGE-NET-ASSETS>                                       3432
<PER-SHARE-NAV-BEGIN>                                     10.00
<PER-SHARE-NII>                                            0.41
<PER-SHARE-GAIN-APPREC>                                    0.30
<PER-SHARE-DIVIDEND>                                       0.46
<PER-SHARE-DISTRIBUTIONS>                                  0.01
<RETURNS-OF-CAPITAL>                                       0.00
<PER-SHARE-NAV-END>                                       10.24
<EXPENSE-RATIO>                                            0.52
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                       0.00
        

</TABLE>


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