PIMCO FUNDS
485APOS, 1997-05-01
Previous: BRAUVIN HIGH YIELD FUND L P, 8-K, 1997-05-01
Next: AMERICAN CABLE TV INVESTORS 5 LTD, 8-K, 1997-05-01



<PAGE>
 
     As filed with the Securities and Exchange Commission on May 1, 1997 
                          File No. 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. 35                    [X]
                                     and/or 

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940            [X]

                               Amendment No. 39                            [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
          1500 K Street, N.W.              840 Newport Center Drive
          Washington, D.C. 20005           Newport Beach, California 92660

                    (Name and Address of Agent for Service)



  It is proposed that this filing will become effective (check appropriate box):
 
    [_]  immediately upon filing pursuant to paragraph (b)

    [_]  on (date) pursuant to paragraph (b)

    [_]  60 days after filing pursuant to paragraph (a)

    [X]  on July 15, 1997 pursuant to paragraph (a)(2) of Rule 485

        CALCULATION OF REGISTRATION FEE UNDER THE SECURITIES ACT OF 1933

<TABLE>
<CAPTION>
 
- ------------------------------------------------------------------------------
                                                              
                                Proposed Maximum                 
                                Offering                         
Title of        Number          Price per            Proposed      Amount of
Securities      of Shares       Share (within        Maximum       Registration
Being           Being           15 days of           Offering      Fee
Registered      Registered      filing)              Price       
- ------------------------------------------------------------------------------
<S>             <C>             <C>                  <C>           <C>
                                                              
Shares of       Indefinite*     N/A                  N/A           N/A
Beneficial
Interest,
Par Value
$.0001
</TABLE>


* Registrant has elected to register an indefinite number of shares of
beneficial interest pursuant to Rule 24f-2 under the Investment Company Act of
1940. Registrant will file the Notice required by Rule 24f-2 on or before 
May 30, 1997, or such other date as prescribed by Section 24(f) of the
Investment Company Act of 1940 and regulations promulgated thereunder.


<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                         Information Contained in Registrant's 
                               Annual Report
          
    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 Prospectus

                       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                     Information Contained in Registrant's 
                               Annual Report

        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 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>
 
 

                                                    [LOGO OF PIMCO APPEARS HERE]
 
PIMCO FUNDS
Pacific Investment Management Series
 
FIXED INCOME FUNDS
    Money Market Fund
    Short-Term Fund
    Low Duration Fund
    Low Duration Fund II
    Low Duration Fund III
    Moderate Duration Fund
    High Yield Fund
    Total Return Fund
    Total Return Fund II
    Total Return Fund III
    Commercial Mortgage Securities Fund
       
    Low Duration Mortgage Fund     
       
    Total Return Mortgage Fund     
    Long-Term U.S. Government Fund
    Real Return Bond Fund
    Foreign Bond Fund
    Global Bond Fund
    Global Bond Fund II
    International Bond Fund
       
    Emerging Markets Bond Fund     
       
    Emerging Markets Bond Fund II     
 
EQUITY FUNDS
    StocksPLUS Fund
    StocksPLUS Short Strategy Fund
 
BALANCED FUND
    Strategic Balanced Fund
 
                                                                      PROSPECTUS
 
- --------------------------------------------------------------------------------
                                                                 
                                                              July 15, 1997     
<PAGE>
 
PIMCO Funds: Pacific Investment Management Series
Prospectus
   
July 15, 1997     
   
PIMCO Funds (the "Trust") is an open-end management investment company
("mutual fund") consisting of twenty-four 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 a separate
prospectus, certain Funds offer up to three additional classes of shares,
Class A shares, Class B shares and Class C shares. See "Other Information--
Multiple Classes of Shares." 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 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's Administrative Class shares are subject to service and/or
distribution fees paid to such entities for services they provide to
shareholders of that class. Administrative Class shares of certain Funds are
not currently available for investment. Institutional Class and Administrative
Class shares of the Funds are offered for sale at the relevant next determined
net asset value for each class with no sales charge. Shares of the PIMCO
International Bond Fund and the PIMCO Emerging Markets Bond Fund II are
offered only to private account clients of PIMCO.     
 
EACH OF THE FUNDS, EXCEPT THE PIMCO MONEY MARKET FUND, 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.
 
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 July 15, 1997, 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. It is
available without charge and may be obtained by writing or calling:     
 
                  PIMCO Funds
                  840 Newport Center Drive, Suite 360
                  Newport Beach, CA 92660
                  Telephone: (800) 927-4648 (Current Shareholders)
                           (800) 800-0952 (New Accounts)
                           (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.
 
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.
   
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")."     
 
                                                    July 15, 1997 Prospectus  1
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
   <S>                                                                      <C>
   Prospectus Summary......................................................   3
   Expense Information.....................................................   8
   Financial Highlights....................................................  10
   Investment Objectives and Policies......................................  16
   Investment Restrictions.................................................  26
   Characteristics and Risks of Securities and Investment Techniques.......  29
   Management of the Trust.................................................  43
   Purchase of Shares......................................................  46
   Redemption of Shares....................................................  48
   Portfolio Transactions..................................................  50
   Net Asset Value.........................................................  51
   Dividends, Distributions and Taxes......................................  52
   Other Information.......................................................  53
   Appendix A -- Description of Duration................................... A-1
   Appendix B -- Description of Securities Ratings......................... B-1
</TABLE>    
 
 2  PIMCO Funds: Pacific Investment Management Series
<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-four 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>   
<CAPTION>
 FIXED INCOME FUNDS   PRIMARY INVESTMENTS        DURATION     CREDIT QUALITY(1) FOREIGN(2)
- ------------------------------------------------------------------------------------------
 <C>                  <S>                        <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 to
                                                 dollar-      5% Aa or Prime 2
                                                 weighted     
                                                 average     
                                                 maturity 
- ------------------------------------------------------------------------------------------
 Short-Term           Money market instruments   0-1 yr       B to Aaa; max     0-5%
                      and short maturity fixed                10% below Baa
                      income securities
- ------------------------------------------------------------------------------------------
 Low Duration         Short and intermediate     1-3 yrs      B to Aaa; max     0-20%
                      maturity fixed income                   10% below Baa
                      securities
- ------------------------------------------------------------------------------------------
 Low Duration II      Same as Low Duration       1-3 yrs      A to Aaa          0%
                      Fund, with quality and
                      foreign issuer
                      restrictions
- ------------------------------------------------------------------------------------------
 Low Duration III     Same as Low Duration       1-3 yrs      B to Aaa; max     0-20%
                      Fund, with prohibitions                 10% below Baa
                      on firms engaged in
                      socially sensitive
                      practices
- ------------------------------------------------------------------------------------------
 Moderate Duration    Short and intermediate     2-5 yrs      B to Aaa; max     0-20%
                      maturity fixed income                   10% below Baa
                      securities
- ------------------------------------------------------------------------------------------
 High Yield           Higher yielding fixed      2-6 yrs      B to Aaa; min     0%
                      income securities                       65% below Baa
- ------------------------------------------------------------------------------------------
 Total Return         Intermediate maturity      3-6 yrs      B to Aaa; max     0-20%
                      fixed income securities                 10% below Baa
- ------------------------------------------------------------------------------------------
 Total Return II      Same as Total Return       3-6 yrs      Baa to Aaa        0%
                      Fund, with quality and
                      foreign issuer
                      restrictions
- ------------------------------------------------------------------------------------------
 Total Return III     Same as Total Return       3-6 yrs      B to Aaa; max     0-20%
                      Fund, with prohibitions                 10% below Baa
                      on firms engaged in
                      socially sensitive
                      practices
- ------------------------------------------------------------------------------------------
 Commercial Mortgage  Commercial mortgage-       3-8 yrs      B to Aaa; max     0%
 Securities           backed securities                       35% below Baa
- ------------------------------------------------------------------------------------------
 Low Duration         Short and intermediate     1-3 yrs      Baa to Aaa;       0%
 Mortgage             maturity mortgage-                      max
                      related securities                      10% below Aaa
- ------------------------------------------------------------------------------------------
 Total Return         Intermediate maturity      plus or      Baa to Aaa;       0%
 Mortgage             mortgage-related           minus 1.5    max
                      securities                 yrs rela-    10% below Aaa
                                                 tive to 
                                                 Lehman
                                                 Brothers
                                                 Mortgage-
                                                 Backed
                                                 Securities
                                                 Index
- ------------------------------------------------------------------------------------------
 Long-Term U.S.       Long-term maturity fixed   greater      A to Aaa          0%
 Government           income securities          than or
                                                 equal to
                                                 8 yrs
- ------------------------------------------------------------------------------------------
 Real Return Bond     Inflation-indexed fixed    Not          A to Aaa          0-35%
                      income securities          applicable,
                                                 but see Fund
                                                 description
- ------------------------------------------------------------------------------------------
 Foreign Bond         Intermediate maturity      3-6 yrs      B to Aaa; max     greater 
                      hedged foreign fixed                    10% below Baa     than or
                      income securities                                         equal to
                                                                                85%
- ------------------------------------------------------------------------------------------
 Global Bond          Intermediate maturity      3-6 yrs      B to Aaa; max     25-75%
                      U.S. and foreign fixed                  10% below Baa
                      income securities
- ------------------------------------------------------------------------------------------
 Global Bond II       Intermediate maturity      3-6 yrs      B to Aaa; max     25-75%
                      U.S. and hedged foreign                 10% below Baa
                      fixed income securities
- ------------------------------------------------------------------------------------------
 International Bond   Foreign fixed income       0-8 yrs      Baa to Aaa        greater 
                      securities (Fund offered                                  than or
                      only to PIMCO private                                     equal to
                      account clients)                                          65%
- ------------------------------------------------------------------------------------------
 Emerging Markets     Emerging market fixed      0-8 yrs      B to Aaa          greater
 Bond                 income securities                                         than or
                                                                                equal to
                                                                                80%
- ------------------------------------------------------------------------------------------
 Emerging Markets     Emerging market fixed      0-8 yrs      B to Aaa          greater
 Bond II              income securities (Fund                                   than or
                      offered only to PIMCO                                     equal to
                      private account clients)                                  80%
- ------------------------------------------------------------------------------------------
<CAPTION>
 EQUITY FUNDS         PRIMARY INVESTMENTS        DURATION     CREDIT QUALITY(1) FOREIGN(2)
- ------------------------------------------------------------------------------------------
 <C>                  <S>                        <C>          <C>               <C>
 StocksPLUS           S&P 500 stock index        0-1 yr       B to Aaa; max     0-20%
                      derivatives backed by a                 10% below Baa
                      portfolio of short-term
                      fixed income securities
- ------------------------------------------------------------------------------------------
 StocksPLUS Short     Inversely correlated S&P   0-1 yr       B to Aaa; max     0-20%
 Strategy             500 derivatives backed                  10% below Baa
                      by
                      a portfolio of short-
                      term fixed income
                      securities
- ------------------------------------------------------------------------------------------
 
<CAPTION>
 BALANCED FUND        PRIMARY INVESTMENTS        DURATION     CREDIT QUALITY(1) FOREIGN(2)
- ------------------------------------------------------------------------------------------
 <C>                  <S>                        <C>          <C>               <C>
 Strategic Balanced   Same as Total Return and   0-6 yrs      B to Aaa; max     0-20%
                      StocksPLUS Funds                        10% below Baa
                      according to PIMCO's
                      allocation strategy
- ------------------------------------------------------------------------------------------
</TABLE>    
1. As rated by Moody's Investors Services, 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 Foreign Bond, Global Bond, Global Bond II,
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 Low Duration II and
Total Return II Funds) may invest beyond these limits in U.S. dollar-
denominated securities of foreign issuers. Neither the Low Duration Fund II nor
the Total Return Fund II may invest in any securities of foreign issuers.     
 
                                                     July 15, 1997 Prospectus  3
<PAGE>
 
 
                    INVESTMENT OBJECTIVES OF THE PIMCO FUNDS
   
  The investment objective of each of the PIMCO Money Market Fund and PIMCO
Short-Term Fund 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 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 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. 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 Corporation ("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
 
4  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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 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-diversified" for purposes of the
Investment Company Act of 1940, 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 $     billion of assets under management as of May 31, 1997. The
Adviser is a subsidiary of PIMCO Advisors L.P. ("PIMCO Advisors"), which had
approximately $      billion of assets under management as of May 31, 1997. 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 Fund and PIMCO Emerging Markets Bond Fund II are offered only to private
account clients of PIMCO. See "Purchase of Shares."     
 
                                                     July 15, 1997 Prospectus  5
<PAGE>
 
 
                           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 Fund and PIMCO Emerging Markets Bond Fund II. 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 Equity 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."
 
6  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                      (This page left blank intentionally)
 
                                                     July 15, 1997 Prospectus  7
<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
   Moderate Duration Fund......................   0.25        0.20        0.45
   High Yield 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
   Commercial Mortgage Securities Fund.........   0.40        0.25        0.65
   Low Duration Mortgage Fund..................   0.25        0.25        0.50
   Total Return Mortgage Fund..................   0.25        0.25        0.50
   Long-Term U.S. Government Fund..............   0.25        0.25        0.50
   Real Return Bond Fund.......................   0.25        0.25        0.50
   Foreign Bond 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
   Emerging Markets Bond Fund..................   0.45        0.40        0.85
   Emerging Markets Bond Fund II...............   0.45        0.40        0.85
   International Bond Fund.....................   0.25        0.25        0.50
   StocksPLUS Fund.............................   0.40        0.25        0.65
   StocksPLUS Short Strategy Fund..............   0.40        0.25        0.65
   Strategic Balanced Fund.....................   0.40        0.25        0.65
</TABLE>    
 
<TABLE>   
<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
   Moderate Duration Fund.....     0.25        0.20           0.25         0.70
   High Yield 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
   Commercial Mortgage
    Securities Fund...........     0.40        0.25           0.25         0.90
   Low Duration Mortgage Fund.     0.25        0.25           0.25         0.75
   Total Return Mortgage Fund.     0.25        0.25           0.25         0.75
   Long-Term U.S. Government
    Fund......................     0.25        0.25           0.25         0.75
   Real Return Bond Fund......     0.25        0.25           0.25         0.75
   Foreign Bond 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
   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
   StocksPLUS Fund............     0.40        0.25           0.25         0.90
   StocksPLUS Short Strategy
    Fund......................     0.40        0.25           0.25         0.90
   Strategic Balanced Fund....     0.40        0.25           0.25         0.90
</TABLE>    
 
8  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
  For a more detailed discussion of the Funds' fees and expenses, see "Fund
Administrator," "Advisory and Administrative Fees," and "Service 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
   Moderate Duration Fund.......................    5      14      25      57
   High Yield 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
   Commercial Mortgage Securities Fund..........    7      21      36      81
   Low Duration Mortgage Fund...................    5      16      28      63
   Total Return Mortgage Fund...................    5      16      28      63
   Long-Term U.S. Government Fund...............    5      16      28      63
   Real Return Bond Fund........................    5      16      28      63
   Foreign Bond Fund............................    5      16      28      63
   Global Bond Fund.............................    6      18      31      69
   Global Bond Fund II..........................    6      18      31      69
   International Bond Fund......................    5      16      28      63
   Emerging Markets Bond Fund...................    9      27      47     105
   Emerging Markets Bond Fund II................    9      27      47     105
   StocksPLUS Fund..............................    7      21      36      81
   StocksPLUS Short Strategy Fund...............    7      21      36      81
   Strategic Balanced 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
   Moderate Duration Fund.......................    7      22      39      87
   High Yield 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
   Commercial Mortgage Securities Fund..........    9      29      50     111
   Low Duration Mortgage Fund...................    8      24      42      93
   Total Return Mortgage Fund...................    8      24      42      93
   Long-Term U.S. Government Fund...............    8      24      42      93
   Real Return Bond Fund........................    8      24      42      93
   Foreign Bond Fund ...........................    8      24      42      93
   Global Bond Fund.............................    8      26      44      99
   Global Bond Fund II..........................    8      26      44      99
   International Bond Fund......................    8      24      42      93
   Emerging Markets Bond Fund...................   11      35      61     134
   Emerging Markets Bond Fund II................   11      35      61     134
   StocksPLUS Fund..............................    9      29      50     111
   StocksPLUS Short Strategy Fund...............    9      29      50     111
   Strategic Balanced 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. 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.
 
                                                     July 15, 1997 Prospectus  9
<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 financial statements,
which are included in the Trust's Annual Report dated March 31, 1997, 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 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 Fund and PIMCO Total Return Fund II 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 Mutual Life
Insurance Company with respect to the Money Market Fund were assumed by PIMCO.
Information for these Funds for each of the five years in the period ended
October 31, 1995, has been audited by the Funds' former independent
accountants.     
 
  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
        3/31/97*    $          $            $             $           $           $             $              $
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
        3/31/97*
        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
        3/31/97*    $          $            $             $           $           $             $              $
        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
        3/31/88(c)   10.00      0.33          0.00         0.33        (0.33)       0.00          0.00          0.00
 Administrative Class
        3/31/97*
        3/31/96(d)    9.98      0.11         (0.07)        0.04        (0.10)       0.00          0.00          0.00
LOW DURATION FUND
 Institutional Class
        3/31/97*    $          $            $             $           $           $             $              $
        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
        3/31/88(e)   10.00      0.74         (0.01)        0.73        (0.74)       0.00          0.00          0.00
 Administrative Class
        3/31/97*
        3/31/96       9.76      0.63          0.21         0.84        (0.65)       0.00          0.00          0.00
        3/31/95(f)    9.67      0.18          0.07         0.25        (0.14)       0.00          0.00          0.00
LOW DURATION FUND II
 Institutional Class
        3/31/97*    $          $            $             $           $           $             $              $
        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(g)   10.00      0.28          0.03         0.31        (0.27)       0.00          0.00          0.00
</TABLE>    
- --------
(a) From commencement of operations, March 1, 1991.
(b) From commencement of operations, January 24, 1995.
(c) From commencement of operations, October 7, 1987.
(d) From commencement of operations, February 1, 1996.
(e) From commencement of operations, May 11, 1987.
(f) From commencement of operations, December 31, 1994.
(g) From commencement of operations, November 1, 1991.
 
10  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                       FINANCIAL HIGHLIGHTS (CONTINUED)
 
  Selected data for a share outstanding throughout each period:
 
 
<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>
  $            $           $             %  $                 %+           %+       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
                                                              +            +        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        (0.68)       9.92    8.49      101,797    0.58         6.86      214.78
    0.00        (0.56)       9.79    4.46       90,114    0.50         5.67       79.30
    0.00        (0.47)       9.92    3.66       73,176    0.50         4.87       45.81
    0.00        (0.37)      10.03    3.94       46,905    0.50         3.67       54.50
    0.00        (0.56)      10.01    5.66       44,172    0.50         5.52       94.62
    0.00        (0.78)      10.02    8.44       44,820    0.50         7.83      115.26
    0.00        (0.86)       9.99    8.86       13,649    0.50         8.61      140.28
    0.00        (0.80)      10.00    8.29       14,401    0.50         8.57      178.21
    0.00        (0.33)      10.00    7.17+       5,546    0.50+        6.99+      11.57
                                                              +            +
    0.00        (0.10)       9.92    0.41        3,999    0.52+        4.44+     214.78
  $            $           $             %  $                 %+           %+          %
    0.00        (0.68)       9.95    9.13    2,677,574    0.42         6.88      208.79
   (0.09)       (0.63)       9.76    3.60    2,332,032    0.41         6.46       77.14
    0.00        (0.72)      10.04    4.56    2,298,255    0.43         6.05       42.69
    0.00        (0.87)      10.30    9.91    1,403,594    0.45         7.21       67.51
    0.00        (0.90)      10.20   11.30      906,650    0.50         8.08       37.21
    0.00        (0.88)      10.02   10.60      516,325    0.57         8.97       44.31
    0.00        (0.89)       9.89   11.36      317,425    0.60         8.83      161.91
    0.00        (0.93)       9.70    6.49      172,046    0.60         8.83       56.23
    0.00        (0.74)       9.99    8.64+     115,865    0.60+        8.85+      77.88
                                                              +            +
    0.00        (0.65)       9.95    8.83        2,536    0.69         6.73      208.79
   (0.02)       (0.16)       9.76    2.53          771    0.66+        6.93+      77.14
  $            $           $             %  $                 %+           %+          %
   (0.02)       (0.65)       9.82    7.30      253,299    0.48         6.61      225.02
   (0.02)       (0.63)       9.77    4.80      170,866    0.47         6.35      102.43
    0.00        (0.63)       9.94    3.15      141,411    0.50         5.73       53.78
    0.00        (0.67)      10.25    8.95      101,025    0.50         6.16       95.33
    0.00        (0.27)      10.04    7.72+      31,027    0.51+        6.80+      12.57
</TABLE>    
- --------
+ Annualized.
 
                                                   July 15, 1997 Prospectus  11
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
  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>
LOW DURATION FUND III
 Institutional Class
        3/31/97(h)  $          $             $             $           $           $             $             $
MODERATE DURATION FUND
 Institutional Class
        3/31/97(h)  $          $             $             $           $           $             $             $
HIGH YIELD FUND
 Institutional Class
        3/31/97*    $          $             $             $           $           $             $             $
        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(i)   10.00      0.24           0.41          0.65      (0.24)        0.00          0.00          0.00
 Administrative Class
        3/31/97*
        3/31/96      10.41      1.02(+)        0.54(+)       1.56      (0.98)        0.00         (0.05)         0.00
        3/31/95(j)   10.14      0.23           0.25          0.48      (0.21)        0.00          0.00          0.00
TOTAL RETURN FUND
 Institutional Class
        3/31/97*    $          $             $             $           $           $             $             $
        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
        3/31/88(e)   10.00      0.67           0.04          0.71      (0.67)        0.00          0.00          0.00
 Administrative Class
        3/31/97*
        3/31/96      10.01      0.80           0.29          1.09      (0.60)       (0.09)        (0.12)         0.00
        3/31/95(k)   10.00      0.31           0.06          0.37      (0.32)       (0.03)         0.00          0.00
TOTAL RETURN FUND II
 Institutional Class
        3/31/97*    $          $             $             $           $           $             $             $
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(l)   10.00      0.49           0.23          0.72      (0.49)        0.00         (0.24)         0.00
 Administrative Class
        3/31/97*
        3/31/96      10.22      0.24          (0.17)         0.07      (0.26)        0.00         (0.09)        (0.05)
       10/31/95(m)    9.34      0.56           0.88          1.44      (0.55)        0.00         (0.01)         0.00
TOTAL RETURN FUND III
 Institutional Class
        3/31/97*    $          $             $             $           $           $             $             $
        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(n)   10.00      0.63           0.58          1.21      (0.63)        0.00         (0.27)         0.00
</TABLE>    
- --------
   
(h) From commencement of operations, December 31, 1996.     
   
(i) From commencement of operations, December 16, 1992.     
   
(j) From commencement of operations, January 16, 1995.     
   
(k) From commencement of operations, September 7, 1994.     
   
(l) From commencement of operations, December 30, 1991.     
   
(m) From commencement of operations, November 30, 1994.     
   
(n) From commencement of operations, May 1, 1991.     
+ Per share amounts based on average number of shares outstanding during the
  period.
 
12  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
  Selected data for a share outstanding throughout each period:
 
<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        (1.06)      10.94   15.70       536,983    0.47            9.28         65.79
    0.00        (0.97)      10.42    8.81       336,310    0.48            9.37         77.60
    0.00        (0.97)      10.52   10.65       219,976    0.50            8.40        112.40
    0.00        (0.24)      10.41   24.43+       24,069    0.50+           8.24+        29.74
    0.00        (1.03)      10.94   15.54         1,007    0.80            9.16         65.79
    0.00        (0.21)      10.41    4.66            41    0.73+          10.12+        77.60
  $            $           $             %  $                  %+              %+            %
    0.00        (0.83)      10.29   11.14    10,247,605    0.42            6.85        221.13
   (0.02)       (0.63)      10.02    4.22     7,239,735    0.41            6.72         98.48
    0.00        (1.18)      10.25    4.55     5,008,160    0.41            6.27        176.74
    0.00        (1.07)      10.91   15.29     3,155,441    0.43            7.07         89.95
    0.00        (1.15)      10.46   14.90     1,813,935    0.46            8.18        110.46
    0.00        (0.91)      10.15   13.74       975,619    0.49            9.10         98.68
    0.00        (0.93)       9.77   11.36       659,663    0.60            8.60        109.90
    0.00        (1.09)       9.62    5.96       192,613    0.60            8.53        195.26
    0.00        (0.67)      10.04    8.31+       45,172    0.60+           7.66+        75.34
    0.00        (0.81)      10.29   10.99       104,618    0.68            6.64        221.13
   (0.01)       (0.36)      10.01    3.76         9,037    0.66+           6.54+        98.48
  $            $           $             %  $                  %+              %+            %
    0.00        (0.40)       9.89     .78       455,583    0.51+           6.36+        73.18
    0.00        (0.63)      10.21   15.96       442,091    0.50            6.47         41.05
   (0.06)       (0.62)       9.39   (3.58)      357,900    0.50            5.22         99.46
    0.00        (0.96)      10.38   13.79       371,260    0.50            5.38         49.71
    0.00        (0.73)       9.99    7.52       287,113    0.50+           5.83+       133.61
    0.00        (0.40)       9.89    0.57         3,320    0.76+           6.06+        73.18
    0.00        (0.56)      10.22   15.92         3,163    0.76+           6.22+        40.91
  $            $           $             %  $                  %+              %+            %
    0.00        (0.75)       9.13   10.06       142,223    0.50            6.82        176.97
   (0.08)       (0.62)       8.99    4.92        99,497    0.50            6.95        145.98
    0.00        (1.19)       9.18    5.64        97,522    0.50            6.00         95.21
    0.00        (1.89)       9.81   14.47        65,349    0.51            6.06        161.38
    0.00        (0.90)      10.31   13.61+       47,908    0.60+           6.75+       521.14
</TABLE>    
- --------
+ Annualized.
 
                                                    July 15, 1997 Prospectus  13
<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
  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>
LONG-TERM U.S. GOV'T FUND
 Institutional Class
3/31/97*     $          $            $             $           $           $             $             $
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(o)    10.00      0.64          0.85          1.49       (0.64)       0.00         (0.03)         0.00
REAL RETURN BOND FUND
 Institutional Class
3/31/97(p)   $          $            $             $           $           $             $             $
FOREIGN BOND FUND
 Institutional Class
3/31/97*     $          $            $             $           $           $             $             $
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(q)    10.00      0.16          0.34          0.50       (0.16)       0.00          0.00          0.00
 Administrative Class
3/31/97(r)   $          $            $             $           $           $             $             $
GLOBAL BOND FUND
 Institutional Class
3/31/97*     $          $            $             $           $           $             $             $
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(s)    10.00      0.16         (0.15)         0.01       (0.16)       0.00          0.00          0.00
 Administrative Class
3/31/97(t)
INTERNATIONAL BOND FUND
 Institutional Class
3/31/97*     $          $            $             $           $           $             $             $
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(u)    10.00      0.15         (0.27)        (0.12)      (0.10)       0.00          0.00          0.00
STOCKSPLUS FUND
 Institutional Class
3/31/97*     $          $            $             $           $           $             $             $
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(v)    10.00      0.34          0.10          0.44       (0.34)      (0.01)        (0.10)        (0.47)
 Administrative Class
3/31/97(w)   $          $            $             $           $           $             $             $
STRATEGIC BALANCED FUND
 Institutional Class
9/30/96(x)   $          $            $             $           $           $             $             $
</TABLE>    
- --------
<TABLE>     
<S>                                       <C> 
(o) From commencement of operations,      (u) From commencement of operations,
    July 1, 1991.                             December 13, 1989. Formerly the
                                              PIMCO International Fund. 

(p) From commencement of operations,      (v) From commencement of operations,
    January 29, 1997.                         May 14, 1993.

(q) From commencement of operations,      (w) From commencement of operations,
    December 3, 1992. Formerly the            January 7, 1997.
    PIMCO Foreign Fund.  

(r) From commencement of operations,      (x) From commencement of operations,
    January 28, 1997.                         June 28, 1996.

(s) From commencement of operations,      ++  Gain distribution includes $0.14
    November 23, 1993. Formerly the           per share characterized for tax
    PIMCO Global Fund.                        purposes as distributions from
                                              ordinary income.

(t) From commencement of operations,      *   Unaudited.
    August 1, 1996. Formerly the
    PIMCO Global Fund.
</TABLE>      
 
14  PIMCO Funds: Pacific Investment Management Series

<PAGE>
 
                        FINANCIAL HIGHLIGHTS (CONTINUED)
 
  Selected data for a share outstanding throughout each period:
 
<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         (1.38)       9.96   14.83        32,511    0.56            6.80         238.32
   0.00         (0.62)       9.85    5.50        32,349    0.50            6.62          88.92
   0.00         (1.96)       9.96    4.13        25,978    0.50            5.37          97.67
   0.00         (1.82)      11.36   23.42        22,946    0.50            6.16         320.08
   0.00         (0.67)      10.82   20.57+       15,900    0.50+           7.91+        427.81
  $            $           $             %   $                 %+              %+             %
   0.00         (0.87)      10.50   21.80       258,493    0.52            5.83       1,233.71
  (0.61)        (0.61)       9.38   (1.85)      232,700    0.47            6.44         299.45
   0.00         (0.98)      10.18    7.79       498,521    0.54            5.12         260.34
   0.00         (0.16)      10.34   16.23+      178,895    0.65+           4.97+        122.55
  $            $           $             %   $                 %+              %+             %
   0.00         (0.99)      10.05   12.04       133,833    0.58            5.88       1,082.91
   0.00         (0.53)       9.87   10.35        76,476    0.64            5.59         461.48
   0.00         (0.16)       9.85    0.08        40,485    0.50+           4.55+        132.41
                                                               +               +
  $            $           $             %   $                 %+              %+             %
   0.00         (0.52)       8.04   15.08     2,271,940    0.50            6.09       1,046.00
   0.00         (2.26)       7.44   (1.27)       45,950    0.43            5.90         674.00
   0.00         (1.31)       9.93    6.54     2,296,978    0.43            5.51         370.00
   0.00         (0.53)      10.53   10.61     2,589,677    0.46            6.67         301.00
   0.00         (0.98)      10.02   10.97     1,314,661    0.51            8.24         201.00
   0.00         (0.93)       9.94   11.55       609,660    0.55            8.23         202.00
   0.00         (0.10)       9.78   (4.18)+     407,210    0.75+           7.94+         49.00
  $            $           $             %   $                 %+              %+             %
   0.00         (2.71)      11.16   34.07       151,869    0.70           15.23         101.67
   0.00         (0.76)      10.48   18.64        46,498    0.50           11.89         176.98
   0.00         (0.92)       9.52    1.55        14,330    0.50+           4.00+         33.29
  $            $           $             %   $                 %+              %+             %
</TABLE>    
- --------
+ Annualized.
 
                                                    July 15, 1997 Prospectus  15
<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
 
  Each of 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 Fund and PIMCO Short-Term
Fund 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. 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, and loan participations; 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 obligations 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. 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 Fund, may invest all
of its assets in derivative instruments or in mortgage- or asset-backed
securities. Each of the Fixed Income Funds,     
 
16  PIMCO Funds: Pacific Investment Management eSeries
<PAGE>
 
   
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 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 dollar-weighted average portfolio maturity of the
Fund will not exceed 90 days.
 
  The PIMCO Money Market Fund may invest only in U.S. dollar-denominated 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 Adviser 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 organizations ("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 Trustees; (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
Trustees; or (3) an unrated security that is of comparable quality to a
security rated in the highest rating category as determined by the Adviser 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 considered 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 ratings applicable to fixed income securities.
 
  The PIMCO 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
accordance with this exception, and (2) this limitation shall not apply to U.S.
Government securities and repurchase agreements with respect 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 investment, in securities of any one issuer that are in
the second-highest rating category, except that this
 
                                                    July 15, 1997 Prospectus  17
<PAGE>
 
limitation shall not apply to U.S. Government securities. In the event that an
instrument acquired by the Fund is downgraded or otherwise ceases to be of the
quality that is required for securities purchased by the Fund, the Adviser,
under procedures approved by the Board of Trustees (or the Board of Trustees
itself if the Adviser becomes aware an unrated security is downgraded below
high quality and the Adviser 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 retain the
instrument.
 
  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 colloquially 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.
 
  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 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
 
18  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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 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). Such
securities are colloquially 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 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 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 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 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
 
                                                    July 15, 1997 Prospectus  19
<PAGE>
 
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 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 TOTAL RETURN MORTGAGE FUND has the same policies as the PIMCO Low
Duration Mortgage Fund, except that its average portfolio duration will
normally vary approximately within a range of plus or minus one and one-half
years of the average duration of the Lehman Brothers Mortgage-Backed Securities
Index, which, as of June 30, 1997, had an average duration of approximately
  years.     
 
  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 and foreign 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 REAL RETURN BOND FUND invests under normal circumstances at least 65%
of its total assets, measured at the time of investment, in inflation-indexed
bonds issued by U.S. and foreign governments, their agencies or
instrumentalities. All securities purchased by the Fund must be rated at least
A by Moody's or S&P (or, if unrated, determined by the Adviser to be of
comparable quality), and the Fund will maintain a minimum average quality of
Aa. 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
 
20  PIMCO Funds: Pacific Investment Management Series
<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 "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.
 
  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 with the
range of the average modified real duration of all inflation-indexed bonds
issued by the U.S. Treasury in the aggregate.
 
  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.
 
  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 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
 
                                                   July 15, 1997 Prospectus  21
<PAGE>
 
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.
 
  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 invests in a portfolio of fixed income
securities denominated in major foreign currencies, baskets of foreign
currencies, and the U.S. dollar. The PIMCO 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 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.     
   
  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     
 
22  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
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 has the same policies as the PIMCO
Emerging Markets Bond Fund, except that it is available only to private account
clients of PIMCO.     
   
  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 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
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.     
 
EQUITY FUNDS
 
  The Equity Funds are the PIMCO StocksPLUS Fund and the PIMCO StocksPLUS Short
Strategy Fund. The investment objective of PIMCO StocksPLUS Fund is to seek to
achieve a total return which exceeds the total return
 
                                                    July 15, 1997 Prospectus  23
<PAGE>
 
performance of the S&P 500 Index. 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 Index.
 
  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 Adviser 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 instruments, 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 foreign currencies, and
may enter into forward currency contracts.
 
  The Equity Funds differ in composition or strategy as follows:
 
  PIMCO STOCKSPLUS FUND invests only in common stocks that are represented in
the S&P 500 ("S&P 500 stocks"), stock index futures, options on stock indexes,
and options on stock index futures that are based on the S&P 500 and swap
agreements with respect to the S&P 500 ("S&P 500 derivatives"). 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 Fund will seek to remain invested in S&P 500
stocks and S&P 500 derivatives even when the S&P 500 is declining.
 
  The percentage of the PIMCO StocksPLUS Fund's assets invested directly in S&P
500 stocks will vary depending primarily on whether S&P 500 derivatives appear,
in the Adviser's opinion, overvalued or undervalued with respect to the stocks
underlying the S&P 500. The Adviser expects that under normal market
conditions, the Fund will invest 100% of its assets in S&P 500 derivatives,
backed by a portfolio of fixed income securities. The Fund will maintain a
segregated account consisting of assets determined to be liquid by the Adviser
in accordance with procedures established by the Board of Trustees, or
otherwise maintain offsetting positions, to cover its open positions in S&P 500
derivatives. 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. Standard and Poor's Corporation ("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.     
 
  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
 
24  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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."
 
  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 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 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 FUND
 
  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 Fund
and the PIMCO 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
 
                                                    July 15, 1997 Prospectus  25
<PAGE>
 
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 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 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
 
26  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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, 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. banks;
 
        (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
  Commercial Mortgage Securities Fund, the Real Return Bond Fund, the Foreign
  Bond Fund, the Global Bond Fund, the Global Bond Fund II, the International
  Bond Fund, the Emerging Markets Bond Fund or the Emerging Markets Bond Fund
  II.);     
     
    (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 Commercial Mortgage Securities
  Fund, the Real Return Bond Fund, the Foreign Bond Fund, the Global Bond
  Fund, the Global Bond Fund II, the International Bond Fund, the Emerging
  Markets Bond Fund or the Emerging Markets Bond Fund II.);     
 
    (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.);
 
                                                    July 15, 1997 Prospectus  27
<PAGE>
 
    (6) for the High Yield, Total Return III, 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 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 High Yield, Total Return III, 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, Moderate Duration, Total Return, Total Return II, Low
  Duration Mortgage, Total Return Mortgage, Commercial Mortgage     
 
28  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
     
  Securities, Long-Term U.S. Government, Real Return Bond, Foreign Bond,
  Global Bond, International Bond, Emerging Markets Bond, Emerging Markets
  Bond II, StocksPLUS Short Strategy, and Strategic Balanced 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 maintenance of a
segregated account consisting 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, the Trust's non-
fundamental restrictions, set forth in the Statement of Additional Information,
may place comparable limitations on these Funds. See "Investment Restrictions"
in the Statement of Additional Information.
 
  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
 
                                                    July 15, 1997 Prospectus  29
<PAGE>
 
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.
 
  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 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     
   
  The 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 Fund's investments in loans
are expected to take the form of loan participations and assignments of
portions of loans from third parties.     
 
30  PIMCO Funds: Pacific Investment Management Series
<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, 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.     
 
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 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 difference 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 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.     
   
  Each of the Fixed Income Funds (except the PIMCO Money Market 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
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.
 
  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 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
 
                                                   July 15, 1997 Prospectus  31
<PAGE>
 
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.
 
  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 Fund) 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
 
32  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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.
 
  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.     
 
  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
 
                                                    July 15, 1997 Prospectus  33
<PAGE>
 
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.     
 
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 maintain a segregated account consisting of 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
 
34  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
fee income equivalent to a lower forward price. The Fund will maintain a
segregated account consisting of 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 a segregated
account consisting 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. 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; (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.
 
DELAYED DELIVERY, WHEN-ISSUED, 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 set aside and
maintain until the settlement date in a segregated account 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 deposited in a segregated account. 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
 
                                                    July 15, 1997 Prospectus  35
<PAGE>
 
dispose of or renegotiate a transaction after it is entered into, and may sell
when-issued 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 High Yield, Total Return III 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 assets
determined to be liquid by the Adviser in accordance with procedures
established by the Board of Trustees, in a segregated account, 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 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 Fund II and PIMCO Total
Return Fund II) 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 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 Fund and PIMCO Emerging
Markets Bond Fund II 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     
 
36  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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 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") 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 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.     
          
  Securities traded in certain emerging European securities markets may be
subject to risks 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. Finally, 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.     
   
  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 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
 
                                                    July 15, 1997 Prospectus  37
<PAGE>
 
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
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. 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
 
38  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
assets determined to be liquid by the Adviser in accordance with procedures
established by the Board of Trustees, in a segregated account 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
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 ("JUNK BONDS")
   
  The PIMCO High Yield Fund invests at least 65% of its assets, each of the
PIMCO Emerging Markets Bond Fund and PIMCO Emerging Markets Bond Fund II 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 (or, if not rated, of comparable quality). In addition, each of the PIMCO
Short-Term, Low Duration, Low Duration III, Moderate Duration, Total Return,
Total Return III, Foreign Bond, Global Bond, Global Bond II, StocksPLUS,
StocksPLUS Short Strategy and Strategic Balanced Funds may invest up to 10% of
its assets in such securities. 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.
 
                                                    July 15, 1997 Prospectus  39
<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 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.
   
  During the year ended March 31, 1997, 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    CAA
- ----              ------- -----  ----  -----  ------- -----  ----  ----  ----
<S>               <C>     <C>    <C>   <C>    <C>     <C>    <C>   <C>   <C>
Short-Term              %      %     %      %      %       %     %     %     %
Low Duration
High Yield
Total Return
Total Return III
Foreign Bond
Global Bond
Global Bond II
StocksPLUS
</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 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 interest rates, foreign currency exchange rates or
securities prices or as part of their overall investment strategies. The Funds
(except the PIMCO Money Market 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. Each Fund will maintain a segregated account consisting of 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 avoid leveraging of the Fund.
 
  The Funds consider derivative instruments 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
 
40  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
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 Fund) 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 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 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 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."
 
                                                    July 15, 1997 Prospectus  41
<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 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 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 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, to limit
any potential leveraging of the Fund's portfolio.
 
42  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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 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
currency futures contracts and options thereon. Each of the Equity 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
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
 
                                                    July 15, 1997 Prospectus  43
<PAGE>
 
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     
   
  These instruments (a type of potentially high-risk derivative) 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.     
   
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 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 whose disposition is restricted
under the federal securities laws (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).     
 
44  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
  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.     
       
                            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, Thomas P. Kemp, Brent
R. Harris, Vern O. Curtis, 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 counseling firm founded in 1971, and had approximately
$    billion in assets under management as of May 31, 1997. PIMCO is a
subsidiary partnership of PIMCO Advisors L.P. ("PIMCO Advisors"). A majority
interest in PIMCO Advisors is held by PIMCO Partners, G.P., a general
partnership between Pacific Investment Management Company, a California
corporation and indirect wholly owned subsidiary of Pacific Mutual Life
Insurance Company ("Pacific Mutual"), and PIMCO Partners, LLC, a limited
liability company controlled by the PIMCO Managing Directors. PIMCO's address
is 840 Newport Center Drive, Suite 360, 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."
 
                                                    July 15, 1997 Prospectus  45
<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                David H. Edington, Managing Director, PIMCO. A
 StocksPLUS Fund                Fixed Income Portfolio Manager, Mr. Edington
 Strategic Balanced Fund        joined PIMCO in 1987 and has managed the PIMCO
 Moderate Duration Fund         Short-Term, StocksPLUS, Strategic Balanced and
                                Moderate Duration Funds since their inception,
                                October 7, 1987, May 14, 1993, June 28, 1996,
                                and December 31, 1996, respectively.
 Low Duration Fund              William H. Gross, Managing Director, PIMCO. A
 Low Duration Fund II           Fixed Income Portfolio Manager, Mr. Gross is
 Low Duration Fund III          one of the founders of PIMCO and has managed
 Total Return Fund              the PIMCO Low Duration, Low Duration II, Low
 Total Return Fund II           Duration III, Total Return, Total Return II and
 Total Return Fund III          Total Return III Funds since their inception,
                                May 11, 1987, November 1, 1991, December 31,
                                1996, May 11, 1987, December 30, 1991, and May
                                1, 1991, respectively.
 Low Duration Mortgage Fund     William C. Powers, Managing Director, PIMCO. A
 Total Return Mortgage Fund     Fixed Income Portfolio Manager, Mr. Powers
                                joined PIMCO in 1991 and has managed the PIMCO
                                Low Duration Mortgage and Total Return Mortgage
                                Funds since their inception, July 15, 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.
 Long-Term U.S. Government Fund Frank B. Rabinovitch, Managing Director, PIMCO.
                                A Fixed Income Portfolio Manager, Mr.
                                Rabinovitch joined PIMCO in 1984 and has
                                managed the PIMCO Long-Term U.S. Government
                                Fund since its inception, July 1, 1991.
 Real Return Bond Fund          John Brynjolfsson, Vice President, PIMCO. A
                                Fixed Income Portfolio Manager, Mr.
                                Brynfolfsson joined PIMCO in 1989, and has
                                managed the PIMCO Real Return Bond Fund since
                                its inception, January 29, 1997.
 Foreign Bond Fund              Lee R. Thomas, III, Managing Director and
 Global Bond Fund               Senior International Portfolio Manager, PIMCO.
 Global Bond Fund II            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 has managed the Emerging Markets
                                Bond and Emerging Markets Bond Fund II since
                                their inception July 15, 1997. Prior to joining
                                PIMCO in 1994, Mr. Rosborough was associated
                                with RBC Dominion in Tokyo as a Vice President
                                and Manager in foreign fixed income.
</TABLE>    
 
46  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
FUND ADMINISTRATOR
 
  PIMCO also serves as administrator to the Funds pursuant to an administration
agreement with the Trust. PIMCO provides administrative services to 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.
 
  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, StocksPLUS, StocksPLUS Short
    Strategy and Strategic Balanced 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.
 
                                                    July 15, 1997 Prospectus  47
<PAGE>
 
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 each Plan, 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 of shares or
administration of plans or programs that use Fund shares as their funding
medium, and to reimburse certain other distribution-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 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 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. 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 Distribution Company
(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 five classes: "Institutional Class,"
"Administrative Class," "Class A," "Class B," and "Class C." This Prospectus
relates only to the Institutional Class and Administrative Class shares of the
Funds. For information regarding Class A, Class B, and Class C 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. Shares of either class may also be offered to clients of the Adviser
and its affiliates. Shares of the PIMCO International
 
48  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
Bond Fund and PIMCO Emerging Markets Bond Fund II 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.     
 
  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.
 
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 360, 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"), 127
West 10th Street, 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 Mutual
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 business (ordinarily 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 prior to 3:00 p.m., Eastern time. An order received after
the close of business will generally 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 New
York Stock Exchange (the "Exchange") is open for trading, which excludes the
following holidays: New Year's 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
 
                                                    July 15, 1997 Prospectus  49
<PAGE>
 
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 following business day.
 
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, when, in the judgment of management, such
suspension or rejection is in the best interests of the Trust; to waive the
minimum initial investment for certain investors; and to redeem shares if
information provided in the Client Registration Application should prove to be
incorrect in any manner judged by the Trust to be material (e.g., in a manner
such as to render the shareholder ineligible to purchase shares of the Trust).
 
  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
 
50  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
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.
 
                              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
360, 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 (714) 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
 
  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
 
                                                    July 15, 1997 Prospectus  51
<PAGE>
 
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 ($10,000 with respect
to accounts opened before January 1, 1995). 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.
 
  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 Fund and PIMCO Emerging Markets
Bond Fund II 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 (except the Opportunity
Fund) of PIMCO Funds: Multi-Manager Series, an affiliated mutual fund family
comprised 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.
 
  The Trust reserves the right to modify or revoke the exchange privilege of
any shareholder or to limit or reject any exchange. Although each Fund will
attempt to give shareholders prior notice whenever it is reasonably able to do
so, it may impose these restrictions at any time.
 
52  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
                             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 also may
consider sales of shares of the Trust as a factor in the selection of broker-
dealers to execute portfolio transactions for the Trust.
   
  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 futures contracts and
other 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 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
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.
 
                                NET ASSET VALUE
 
  The net asset value per share of each of the Institutional Class and
Administrative Class of each Fund is determined as of the close of trading on
the Exchange (ordinarily 4:00 p.m., Eastern time) 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 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
 
                                                    July 15, 1997 Prospectus  53
<PAGE>
 
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's distribution and/or
servicing fees and any other expenses specially 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 "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.
 
                       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 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.
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.
   
  Distributions received by tax-exempt shareholders will not be subject to
federal income tax to the extent permitted under applicable tax law. To the
extent that a shareholder is not exempt from tax on Fund distributions, such
shareholder will be subject to tax on dividends received from a 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 paid from a Fund's net capital gain (that is, the excess of
net long-term gain over net short-term loss) that are designated by the Fund as
capital gain dividends 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     
 
54  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
December 31 of that year if paid to shareholders during January of the
following calendar year. 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 and GNMA Certificates). Each Fund
will advise shareholders annually of the amount and nature of the dividends
paid to them.
   
  Coupon payments received by a Fund from inflation-indexed bonds will be
includable in the Fund's gross income in the period in which they accrue.
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.
 
  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 Class and Administrative Class shares, certain
Funds offer Class A shares, Class B shares, and Class C shares. These other
classes of the Funds may have different sales charges and expense levels, which
will
 
                                                    July 15, 1997 Prospectus  55
<PAGE>
 
affect performance accordingly. Investors may contact the Distributor at (800)
426-0107 for more information concerning other classes of shares of the Funds.
This Prospectus relates only to the Institutional Class shares and
Administrative Class 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 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 June 30, 1997, the following were shareholders of
record of at least 25% of the outstanding voting securities of the indicated
Funds: California Community Foundation (Los Angeles, California) and Marin
Community Foundation (Larkspar, California) with respect to the PIMCO Money
Market Fund; Sprint Corporation (Westwood, Kansas) with respect to the PIMCO
Low Duration Fund II; Archdiocese of Los Angeles (Los Angeles, California) with
respect to the PIMCO Total Return Fund III; Wendel & Co. (New York, New York)
with respect to the PIMCO Long-Term U.S. Government Fund; Donaldson, Lufkin &
Jenrette (Jersey City, New Jersey) and Charles Schwab & Co., Inc. (San
Francisco, California) with respect to the PIMCO Foreign Bond Fund; and Pacific
Financial Asset Management Corporation with respect to the PIMCO Strategic
Balanced Fund and the PIMCO Global Bond Fund II. 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. 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
 
56  PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
   
assume that all dividends and distributions are reinvested when paid.
Consistent with Securities and Exchange Commission rules and informal guidance,
for periods prior to the initial offering date of a particular class, total
return presentations for the class may be based on the historical performance
of an older class of the Fund (the older class to be used in each case is set
forth in the Statement of Additional Information), restated to reflect current
sales charges or redemption fees (if any), but not reflecting different
operating expenses (such as service or distribution fees and administrative fee
charges) associated with the newer class. All other things being equal, such
higher expenses would have adversely affected (i.e., reduced) total return for
a newer class (i.e., if the newer class had been issued since the inception of
the Fund) by the amount of such higher expenses, compounded over the relevant
period. 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.
   
  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. The Trust's Annual Report contains
additional performance information for the Funds and is available upon request,
without charge, by calling (800) 927-4648 (Current Shareholders), or (800) 800-
0952 (New Accounts).
 
                                                    July 15, 1997 Prospectus  57
<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.
 
 
                                                  July 15, 1997 Prospectus  A-1
<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.
 
                                                  July 15, 1997 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 CORPORATION
 
 CORPORATE AND MUNICIPAL BOND RATINGS
 
 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.
 
 
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.
 
                                                   July 15, 1997 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
 
  A Standard & Poor's 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 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 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>
 
 
 
                                                    [LOGO OF PIMCO APPEARS HERE]
 
 
PIMCO FUNDS
Pacific Investment Management Series
 
INVESTMENT ADVISER AND ADMINISTRATOR
    Pacific Investment Management Company
    840 Newport Center Drive, Suite 360
    Newport Beach, CA 92660
 
CUSTODIAN AND TRANSFER AGENT
    Investors Fiduciary Trust Company
    127 West 10th Street
    Kansas City, MO 64105
 
ACCOUNTANTS
    Price Waterhouse LLP
    1055 Broadway
    Kansas City, MO 64105
 
COUNSEL
    Dechert Price & Rhoads
    1500 K Street, N.W., Suite 500
    Washington, DC 20005
 
                                                                      PROSPECTUS
 
- --------------------------------------------------------------------------------
                                                                 
                                                              July 15, 1997     
<PAGE>
 
            PIMCO Funds
            Prospectus
            -------------------------------------------------------------------
PACIFIC     LONG-TERM BOND FUNDS
INVESTMENT  Long-Term U.S. Government Fund
MANAGEMENT  -------------------------------------------------------------------
SERIES      INTERMEDIATE-TERM BOND FUNDS
   
            Emerging Markets Bond Fund 
JULY 15,    Foreign Bond Fund
1997        Global Bond Fund II     
            High Yield Fund
            Total Return Fund
               
            Total Return Mortgage Fund     
            Real Return Bond Fund
            -------------------------------------------------------------------
            SHORTER-TERM BOND FUNDS
            Low Duration Fund
               
            Low Duration Mortgage Fund     
            Short-Term Fund
            Money Market Fund
            -------------------------------------------------------------------
            EQUITY FUNDS
            StockPLUS Fund
 
 
            P I M C O
<PAGE>
 
            PIMCO Funds: Pacific Investment Management Series
            Prospectus
               
            July 15, 1997     
               
            PIMCO Funds (the "Trust") is an open-end series management invest-
            ment company consisting of twenty-four separate investment portfo-
            lios, each with different investment objectives and strategies.
            Thirteen of the twenty-four portfolios (each a "Fund") are de-
            scribed herein. The Trust is designed to provide access to the
            professional investment management services offered by Pacific In-
            vestment 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 360,
            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 and other
            series of the Trust offer up to two additional classes of shares,
            Institutional Class shares and Administrative Class shares. See
            "Description of the Trust--Multiple Classes of Shares."
 
            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.
 
            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 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 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 July 15, 1997, as
            amended or supplemented from time to time, is available free of
            charge by writing to PIMCO Funds Distribution Company (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.
               
            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
Schedule of Fees.................................................  4
Financial Highlights.............................................  7
Investment Objectives and Policies...............................  8
Investment Risks and Considerations.............................. 15
Characteristics and Risks of Securities and Investment
 Techniques...................................................... 16
Performance Information.......................................... 31
How to Buy Shares................................................ 32
Alternative Purchase Arrangements................................ 35
Exchange Privilege............................................... 44
</TABLE>    

<TABLE>   
<S>                                                               <C>
How to Redeem.................................................... 45
Distributor and Distribution and Servicing Plans................. 48
How Net Asset Value Is Determined ............................... 52
Distributions.................................................... 53
Taxes............................................................ 53
Management of the Trust.......................................... 54
Description of the Trust......................................... 57
Mailings to Shareholders......................................... 57
Appendix A -- Description of Duration............................ 58
Appendix B -- Description of Securities Ratings.................. 59
</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 of the Funds. Pa-
            cific Investment Management is one of the premier fixed income in-
            vestment management firms in the U.S. As of May 31, 1997, Pacific
            Investment Management had over $  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>               <C>
FUND       LONG-TERM BOND   Long-Term U.S. Government Maximum total return, consistent       greater than or   A to Aaa
PROFILES    FUNDS                                     with preservation of capital           equal to 8 
                                                      and prudent investment management      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.)

                            ------------------------------------------------------------------------------------------------------
                            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 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.)
                            ------------------------------------------------------------------------------------------------------
                            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 Mortgage     Maximum total return, consistent       plus or minus 1.5 Baa to Aaa; max
                                                      with preservation of capital           years relative to 10% below Aaa
                                                      and prudent investment management      Lehman Brothers
                                                                                             Mortgage-Backed
                                                                                             Securities Index
                            ------------------------------------------------------------------------------------------------------
                            Real Return Bond          Maximum real return, consistent        Not applicable,   A to Aaa
                                                      with preservation of real capital      but see Fund
                                                      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 Mortgage     Maximum total return, consistent       1-3 years         Baa to Aaa; max
                                                      with preservation of capital                             10% below Aaa
                                                      and 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 than
                                                      daily liquidity                        dollar-weighted   or equal to 5% Aa 
                                                                                             average maturity  or Prime 2       
           -----------------------------------------------------------------------------------------------------------------------
           EQUITY 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 Services, Inc., or if unrated,
            determined 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.
                                                      July 15, 1997 Prospectus
                                                                               3
<PAGE>
 
            Schedule of Fees
 
 
 
<TABLE>   
<CAPTION>
                                               CLASS A     CLASS B     CLASS C
                                               SHARES      SHARES      SHARES
                   -------------------------------------------------------------- 
<S>                <C>                         <C>         <C>         <C>
SHAREHOLDER        MAXIMUM INITIAL SALES
TRANSACTION         CHARGE IMPOSED ON
EXPENSES            PURCHASES
                    (as a percentage of
                    offering price at time
                    of purchase)
                     LONG-TERM U.S.
                      GOVERNMENT, EMERGING
                      MARKETS BOND, FOREIGN
                      BOND, GLOBAL BOND II,
                      HIGH YIELD, TOTAL
                      RETURN AND TOTAL
                      RETURN MORTGAGE FUNDS     4.50%       None        None
                     REAL RETURN BOND, LOW
                      DURATION, LOW DURATION
                      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 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      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
                                            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> <C>
CLASS A    LONG-TERM U.S.
SHARES     GOVERNMENT             .25%      .40%      .25%        .90%      $54  $72 $93 $151 $54  $72 $93 $151
           ----------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND  .45       .55       .25        1.25        --   --  --   --  --   --  --   --
           ----------------------------------------------------------------------------------------------------
           FOREIGN 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
           ----------------------------------------------------------------------------------------------------
           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 MORTGAGE  .25       .40       .25         .90        54   72  93  151  54   72  93  151
           ----------------------------------------------------------------------------------------------------
           REAL RETURN BOND       .25       ,40       .25         .90        39   58  78  137  39   58  78  137
           ----------------------------------------------------------------------------------------------------
           LOW DURATION           .25       .40       .25         .90        39   58  78  137  39   58  78  137
           ----------------------------------------------------------------------------------------------------
           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
           ----------------------------------------------------------------------------------------------------
           STOCKSPLUS             .40       .40       .25        1.05        40   62  86  154  40   62  86  154
           ----------------------------------------------------------------------------------------------------
</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.
 
 PIMCO Funds: Pacific Investment Management Series
4
<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
           ---------------------------------------------------------------------------------------------------------
<S>        <C>                    <C>        <C>        <C>         <C>         <C>  <C> <C>  <C>  <C>  <C> <C> <C>
CLASS B    LONG-TERM U.S.
SHARES     GOVERNMENT                   .25%       .40%       1.00%       1.65% $67  $82 $110 $166 $17  $52 $90 $166
           ---------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND        .45        .55        1.00        2.00   --   --   --   --  --   --  --   --
           ---------------------------------------------------------------------------------------------------------
           FOREIGN 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
           ---------------------------------------------------------------------------------------------------------
           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 MORTGAGE        .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 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
           ---------------------------------------------------------------------------------------------------------
           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 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."
                                                      July 15, 1997 Prospectus
                                                                               5
<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
                                             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> <C>
CLASS C    LONG-TERM U.S.
SHARES     GOVERNMENT                   .25%       .40%       1.00%           1.65%     $27  $52 $90 $195 $17  $52 $90 $195
           ----------------------------------------------------------------------------------------------------------------
           EMERGING MARKETS BOND        .45        .55        1.00            2.00       --   --  --   --  --   --  --   --
           ----------------------------------------------------------------------------------------------------------------
           FOREIGN 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
           ----------------------------------------------------------------------------------------------------------------
           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 MORTGAGE        .25        .40        1.00            1.65       27   52  90  195  17   52  90  195
           ----------------------------------------------------------------------------------------------------------------
           REAL RETURN BOND             .25        .40         .75/(2)/       1.40/(3)/  24   44  77  168  14   44  77  168
           ----------------------------------------------------------------------------------------------------------------
           LOW DURATION                 .25        .40         .75            1.40       24   44  77  168  14   44  77  168
           ----------------------------------------------------------------------------------------------------------------
           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
           ----------------------------------------------------------------------------------------------------------------
           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 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 Real Return Bond,
            Short-Term, Money Market and StocksPLUS Funds to the following an-
            nual rates based on the Fund's average daily net assets until fur-
            ther notice: Real Return Bond--.75%; Short-Term--.55%; Money Mar-
            ket--.10%; and StocksPLUS--.75%. Absent such undertakings, the
            12b-1 fee for each such Fund would be as follows: Real Return
            Bond--1.00%; Short-Term--1.00%; Money Market--.20%; and
            StocksPLUS--1.00%.
            3. Absent the undertakings noted, the "Total Fund Operating Ex-
            penses" for the Real Return Bond, Short-Term, Money Market and
            StocksPLUS Funds would be as follows (based on average daily net
            assets): Real Return Bond--1.65%; Short-Term--1.60%; Money Mar-
            ket--.70%; 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 for the Global Bond
            Fund II reflects the Fund's current fees and expenses and not the
            fees and expenses of its predecessor, which was a series of PIMCO
            Advisors Funds that reorganized as a series of the Trust on Janu-
            ary 17, 1997. The Examples for Class A shares assume payment of
            the current maximum applicable sales load. Due to the 12b-1 dis-
            tribution 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.


 PIMCO Funds: Pacific Investment Management Series
6
<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
            financial statements, which are included in the Trust's Annual Re-
            port dated March 31, 1997, 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 Price Waterhouse LLP, independent accoun-
            tants, whose opinion thereon is also included in the Annual Re-
            port, which may be obtained without charge. Information is pre-
            sented 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 re-
            organized as a series of the Trust on January 17, 1997. Informa-
            tion for the Global Bond Fund II for the period ended September
            30, 1996, has been audited by that Fund's former independent
            accountants.     
               
               Selected data for a share outstanding throughout each period:
                
            GLOBAL BOND FUND II (AS OF 9/30/96)
 
<TABLE>
<CAPTION>
                                      Class A/(1)/  Class B/(1)/  Class C/(1)/
                                      ------------  ------------  ------------
           <S>                        <C>           <C>           <C>
           Net Asset Value,
            Beginning of Period       $  10.00      $  10.00      $  10.00
                                      --------      --------      --------
           INCOME FROM INVESTMENT
            OPERATIONS:
           Net Investment Income          0.32/(2)/     0.30/(2)/     0.30/(2)/
           Net Gains or Losses on
            Securities (both
            realized and unrealized)      0.95          0.92          0.92
                                      --------      --------      --------    
           Total From Investment
            Operations                    1.27          1.22          1.22
                                      --------      --------      --------
           Less Distributions:
           Dividends (from net
            investment income)           (0.31)        (0.26)        (0.26)
                                      --------      --------      --------
           Net Asset Value, End of
            Period                    $  10.96      $  10.96      $  10.96
                                      ========      ========      ========
           TOTAL RETURN (without
            sales charge)                15.01%        14.54%        14.54%
           RATIOS/SUPPLEMENTAL DATA
           Net Assets, End of Period
            (in 000s)                 $  7,360      $  3,240      $  3,459
           Ratio of Expenses to
            Average Net Assets:
             With Waiver                  1.27%         2.49%         2.49%
             Without Waiver               1.57%         2.49%         2.49%
           Ratio of Net Investment
            Income to Average Net
            Assets:
             With Waiver                  4.88%         4.09%         4.09%
             Without Waiver               4.58%         4.09%         4.09%
           Portfolio Turnover Rate    1,245.62%     1,245.62%     1,245.62%
</TABLE>
            1. The Fund commenced operations as a series of PIMCO Advisors
            Funds on October 2, 1995.
            2. Reflecting voluntary waiver of investment advisory fee of
            $12,041 (0.01 per share) by PIMCO Advisors L.P. (the Global Income
            Fund's investment adviser for the period listed), as more fully
            described in Note 3(a) to the Financial Statements in the PIMCO
            Advisors Funds' 1996 Annual Report.
                                                      July 15, 1997 Prospectus
                                                                               7
<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 Fund, each remaining Fund
INCOME FUND (together, the "Fixed Income Funds") differs from the others pri-
DESCRIP-    marily in the length of the Fund's duration or the proportion of
TIONS       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 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 Short-Term Fund and the Money Mar-
            ket 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 suc-
            cessful 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 including hybrid or "indexed" securities, and loan
            participations; 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     
 PIMCO Funds: Pacific Investment Management Series
8
<PAGE>
 
               
            all of its assets in derivative instruments or in mortgage- or as-
            set-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 Foreign Bond, Global Bond II, Emerging Markets Bond
            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 Emerging Markets Bond Fund) 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 ad-
            versely 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.
               
            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     
                                                      July 15, 1997 Prospectus
                                                                               9
<PAGE>
 
               
            Reconstruction and Development (i.e., the World Bank), including
            its various offshoots, such as the International Finance Corpora-
            tion, or the United Nations or its authorities. The Fund's invest-
            ments in emerging market fixed income securities may be repre-
            sented by futures contracts (including related options) with re-
            spect to such securities, options on such securities, equity secu-
            rities (including common stocks) upon the conversion of convert-
            ible securities, or securities the return on which is derived pri-
            marily 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")."     
 
            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). 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 average portfolio dura-
            tion of this Fund will normally vary within a three- to six-year
            time frame.
 
            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
            Advisor deems it appropriate to do so. Depending on the Advisor's
            current opinion as to the proper allocation of assets among domes-
            tic and foreign issuers, investments in the securities of issuers
 
10
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            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, de-
            termined by the Advisor to be of comparable quality). For informa-
            tion 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 nor-
            mally 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 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 rele-
            vant.
 
            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-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 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 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 quality). The aver-
            age portfolio duration of this Fund will normally vary approxi-
            mately within a range of plus or minus one and one-half years of
            the average duration of the Lehman Brothers Mortgage-Backed Secu-
            rities Index, which, as of June 30, 1997, had an average duration
            of approximately   years. The Fund may invest without limit in
            U.S. dollar-denominated securities of foreign issuers.     
                                                      July 15, 1997 Prospectus
                                                                              11
<PAGE>
 
 
            REAL RETURN BOND FUND invests under normal circumstances at least
            65% of its total assets, measured at the time of investment, in
            inflation-indexed bonds issued by U.S. and foreign governments,
            their agencies or instrumentalities. All securities purchased by
            the Fund must be rated at least A by Moody's or S&P (or, if
            unrated, determined by the Advisor to be of comparable quality),
            and the Fund will maintain a minimum average quality of Aa. 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 MORTGAGE FUND has the same policies as the Total Re-
            turn Mortgage Fund, except that its average portfolio duration
            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 duration strategy. 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.     
 
            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). For informa-
            tion 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.
 
            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
 
12
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            assets, measured at the time of investment, in money market secu-
            rities 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 Fund may invest in the
            following: obligations of the U.S. Government (including its agen-
            cies 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 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.
 
 
EQUITY FUND STOCKSPLUS FUND, as its investment objective, seeks to achieve to-
DESCRIPTION tal return which exceeds the total return performance of the Stan-
            dard & Poor's Composite Stock Price Index ("S&P 500"). The Fund
            invests only in common stocks that are represented in the S&P 500
            ("S&P 500 stocks"), stock index futures, options on stock indexes,
            and options on stock index futures that are based on the S&P 500
            and swap agreements with respect to the S&P 500 ("S&P 500 deriva-
            tives"). StocksPLUS is the name of a proprietary portfolio manage-
            ment 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 Fund will seek to remain invested in S&P 500
            stocks and S&P 500 derivatives even when the S&P 500 is declining.
                                                      July 15, 1997 Prospectus
                                                                              13
<PAGE>
 
               The percentage of the StocksPLUS Fund's assets invested di-
            rectly in S&P 500 stocks will vary depending primarily on whether
            S&P 500 derivatives appear, in the Advisor's opinion, overvalued
            or undervalued with respect to the stocks underlying the S&P 500.
            The Advisor expects that under normal market conditions, the Fund
            will invest 100% of its assets in S&P 500 derivatives, backed by a
            portfolio of fixed income securities. The Fund will maintain a
            segregated account consisting of assets determined to be liquid by
            the Advisor in accordance with procedures established by the Board
            of Trustees, or otherwise maintain offsetting positions, to cover
            its open positions in S&P 500 derivatives. The Advisor will ac-
            tively manage the fixed income assets serving as cover for deriva-
            tives, 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--De-
            scription 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.
               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 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 Advisor 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.     
 
 
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 apprecia-
 
14
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            tion or depreciation) is largely a function of changes in the cur-
            rent 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 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 composi-tion 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 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.
                                                      July 15, 1997 Prospectus
                                                                              15
<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, Foreign Bond, Global Bond II 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 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.     
               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
 
16
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            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 Stu-
            dent Loan Marketing Association, are supported only by the credit
            of the instrumentality. U.S. Government securities include securi-
            ties 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 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 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 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        The 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 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 Funds may
            participate in such syndicates, or can buy part of a loan, becom-
            ing a direct lender. Participations and     

                                                      July 15, 1997 Prospectus
                                                                              17
<PAGE>
 
               
            assignments involve special types of risk, including limited mar-
            ketability and the risks of being a lender. See "Illiquid Securi-
            ties" 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.     
 
 
 
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 Low Duration Mortgage Fund)
            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 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%).
               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.
 
18
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               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 Real Return Bond 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 particu-
            lar amount of inflation-indexed bonds. Certain foreign govern-
            ments, 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 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) may invest all of
RELATED AND its assets in mortgage- or other asset-backed securities. The
OTHER       value of some mortgage- or asset-backed securities in which the
ASSET-      Funds invest may be particularly sensitive to changes in prevail-
BACKED      ing interest rates, and, like the other investments of the Funds,
SECURITIES  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, 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.
                                                      July 15, 1997 Prospectus
                                                                              19
<PAGE>
 
               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 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.     
 
 
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
 
20
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            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 repur-
            chase 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 maintain a segregated account consisting of assets
            determined to be liquid by the Advisor in accordance with proce-
            dures established by the Board of Trustees to cover its obliga-
            tions 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% as-
            set 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 maintain a segregated account consisting of assets determined
            to be liquid by the Advisor in accordance with procedures estab-
            lished 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 a segregated account consisting 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 transac-
            tions (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 tempo-
            rary administrative purposes. The Global Bond Fund II may not bor-
            row 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 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
TRANSAC-    of security. When such purchases are outstanding, the Fund will
TIONS       set aside and maintain until the settlement date in a segregated
            account, assets determined to be liquid by the Advisor in accor-
            dance with
 
                                                                             21
                                                      July 15, 1997 Prospectus
<PAGE>
 
            procedures established by the Board of Trustees, in an amount suf-
            ficient 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 in-
            come on securities it has deposited in a segregated account. When
            purchasing a security on a when-issued, delayed delivery, or for-
            ward 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 deter-
            mining 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
            delivery, or forward commitment basis, the Fund does not partici-
            pate 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 oppor-
            tunity or could suffer a loss. A Fund may dispose of or renegoti-
            ate a transaction after it is entered into, and may sell when-is-
            sued 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 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 assets determined to be liquid by the
            Advisor in accordance with procedures established by the Board of
            Trustees, in a segregated account, 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."
 
 
FOREIGN        
SECURITIES  Each of the Funds may invest directly in fixed income securities
            of non-U.S. issuers. The Long-Term U.S. Government, High Yield,
            Total Return Mortgage, Low Duration Mortgage and Money Market
            Funds may only invest in U.S. dollar-denominated fixed income se-
            curities of non-U.S. issuers. The StockPLUS 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 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 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 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     
 
22
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               
            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 custo-
            dial fees than apply to domestic custodial arrangements and trans-
            action costs of foreign currency conversions. Changes in foreign
            exchange rates also will affect the value of securities denomi-
            nated 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.     
               
               Securities traded in certain emerging European securities mar-
            kets may be subject to risks due to the inexperience of financial
            intermediaries, the lack of modern technology and the lack of a
            sufficient capital base to expand business operations. Addition-
            ally, 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. Fi-
            nally, any change in the leadership or policies of Eastern Euro-
            pean countries, or the countries that exercise a significant in-
            fluence 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 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 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

                                                      July 15, 1997 Prospectus
                                                                              23
<PAGE>
 
            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
TRANSACT-   of supply and demand in the foreign exchange markets and the rela-
IONS        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, in a segregated account 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 will use these tech-
            niques to hedge at least 75% of its exposure to foreign currency.
            For a description of these instruments, see "Derivative Instru-
            ments" below and the Statement of Additional Information.
 
24
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
 
 
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, of comparable quality). In addition, each of the Foreign
            Bond, Global Bond II, Total Return, Low Duration, Short-Term and
            StocksPLUS Funds may invest up to 10% of its assets in such secu-
            rities. 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 follow-
            ing 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.
                                                      July 15, 1997 Prospectus
                                                                              25
<PAGE>
 
               
               During the year ended March 31, 1997, 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     CAA
           --------------------------------------------------------------------------------
           <S>             <C>     <C>    <C>    <C>    <C>     <C>    <C>    <C>    <C>
           FOREIGN BOND          %      %      %      %       %      %      %      %      %
           --------------------------------------------------------------------------------
           GLOBAL BOND II
           --------------------------------------------------------------------------------
           HIGH YIELD
           --------------------------------------------------------------------------------
           TOTAL RETURN
           --------------------------------------------------------------------------------
           LOW DURATION
           --------------------------------------------------------------------------------
           SHORT-TERM
           --------------------------------------------------------------------------------
           STOCKSPLUS
</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) 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 strat-
            egies. The Funds (except the Money Market 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. Each
            Fund will maintain a segregated account consisting of assets de-
            termined to be liquid by the Advisor in accordance with procedures
            established by the Board of Trustees (or, as permitted by applica-
            ble regulation, enter into certain offsetting positions) to cover
            its obligations under options, futures, and swaps to avoid
            leveraging of the Fund.
               
               The Funds consider 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. Each Fund (except the Money Mar-
            ket Fund) 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 fore-
            casts such factors and has taken positions in derivative instru-
            ments contrary to prevailing market trends, the Funds could be ex-
            posed to the risk of loss.     
 
26
 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 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 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 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 disad-
            vantageous 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
                                                      July 15, 1997 Prospectus
                                                                              27
<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 a
            Fund seeks to close out an option position. Furthermore, if trad-
            ing restrictions or suspensions are imposed on the options mar-
            kets, 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 Funds 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 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 maintenance of a segregated account con-
            sisting of assets determined to be liquid by the Advisor in accor-
            dance with procedures established by the Board of Trustees, to
            limit any potential leveraging of the Fund's portfolio. Obliga-
            tions under swap agreements so covered will not be construed to be
            "senior securities" for purposes of the Funds' investment restric-
            tion 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
            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
 
28
 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) 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 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.
           
HYBRID      These instruments (a type of potentially high-risk derivative) can
INSTRUMENTS 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 com-
            modity, currency or securities index or another interest rate
            (each a "benchmark"). The interest rate or (unlike most fixed-in-
            come securities) the principal amount payable at maturity of a hy-
            brid 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 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.     

                                                      July 15, 1997 Prospectus
                                                                              29
<PAGE>
 
               
               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.     
   
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. 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 offered Institutional or Ad-
            ministrative Class shares, is incorporated by reference in the
            Statement 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
            "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
            whose disposition is restricted under the federal securities 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 substan-
            tial delays and additional costs.     
       
30
 PIMCO Funds: Pacific Investment Management Series
<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.
               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 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. Consistent with Securities and Exchange
            Commission rules and informal guidance, for periods prior to the
            initial offering date of a particular class, total return presen-
            tations for the class will be based on the historical performance
            of an older class of the Fund (the older class to be used in each
            case is set forth in the Statement of Additional Information) re-
            stated to reflect 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 administrative fee
            charges) associated with the newer class. All other things being
            equal, such higher expenses would have adversely affected (i.e.,
            reduced) total return for a newer class (i.e., if the newer class
            had been issued since the inception of the Fund) by the amount of
            such higher expenses, compounded over the relevant period. 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.
               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
 
                                                                             31
                                                      July 15, 1997 Prospectus
<PAGE>
 
            information for a particular class of a Fund will be based on dis-
            tributions 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 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 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 Distribution Company (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). 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. 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
 
32
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            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 10:00 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 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 the Trust and series of PIMCO
            Funds: Multi-Manager Series is $1,000 and in any Fund is $250, and
            the minimum additional investment is $100 per Fund. The minimum
            initial investment for gifts to minors is $250 per Fund. For in-
            formation about dealer commissions, see "Alternative Purchase Ar-
            rangements" below. Persons selling Fund shares may receive differ-
            ent 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 certifi-
            cates 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. 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 Distribution Company, along with a completed applica-
            tion form to:
 
               PIMCO Funds Distribution Company
               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.
                                                      July 15, 1997 Prospectus
                                                                              33
<PAGE>
 
 
 
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 Distribution Com-
            pany 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) for which First
RETIREMENT  National Bank of Boston serves as trustee and for IRA accounts es-
PLANS       tablished with Form 5305-SIMPLE under the Internal Revenue Code.
            These accounts include Simplified Employee Pension Plan (SEP) and
            Salary 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
            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 and subsequent investment in any Fund for tax-qualified plans
            is $25.
 
 
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. 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 com-
            pleting 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 800-852-8457. 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
 
34
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            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   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-
REGISTRA-   ing to the Transfer Agent. Signature guarantees may be required.
TION        See "Signature Guarantee" above. All correspondence must include
CHANGES     the account number and must be sent to:
 
                PIMCO Funds Distribution Company
                P.O. Box 5866
                Denver, CO 80217-5866
 
            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 two additional classes of shares, Institutional Class shares
            and Administrative Class shares, to pension and profit sharing
            plans, employee benefit plans, endowments, foundations, corpora-
            tions and other high net worth individuals. 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, Ad-
            ministrative 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 Institu-
            tional Class or Administrative Class shares, please call the Dis-
            tributor at 800-426-0107.
               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
                                                      July 15, 1997 Prospectus
                                                                              35
<PAGE>
 
            exchange shares for shares of other Funds. Generally, when making
            an investment decision, investors should consider the anticipated
            life of an intended investment in the Funds, the accumulated dis-
            tribution 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 pos-
            sibility 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 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 a distribution without
            penalty under Section 72(t) of the
 
36
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            Internal Revenue Code of 1986, as amended (the "Code"), from a re-
            tirement plan, including a 403(b)(7) plan or an IRA (a) upon at-
            taining age 59 1/2, (b) as part of a series of substantially equal
            periodic payments, or (c) in the case of an employer sponsored re-
            tirement plan, upon separation from service and attaining age 55;
            (ii) any partial or complete redemption in connection with a qual-
            ifying loan or hardship withdrawal from an employer sponsored re-
            tirement plan; (iii) any complete redemption in connection with a
            distribution from a qualified employer retirement plan in connec-
            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) involuntary redemptions caused by operation of law;
            (x) redemption of shares of any Fund that is combined with another
            Fund, investment company, or personal holding company by virtue of
            a merger, acquisition or other similar reorganization transaction;
            (xi) redemptions by a shareholder who is a participant making pe-
            riodic 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 pur-
            chases; (xii) redemptions effected by trustees or other fiducia-
            ries who have purchased shares for employer sponsored plans, the
            trustee, administrator, fiduciary, broker, trust company or regis-
            tered investment adviser for which has an agreement with the Dis-
            tributor with respect to such purchases; or (xiii) redemptions in
            connection with IRA accounts established with Form 5305-SIMPLE un-
            der the Code for which the Trust is the designated financial in-
            stitution.
               
               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, provides 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.
                                                      July 15, 1997 Prospectus
                                                                              37
<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.
                 
              LONG-TERM U.S. GOVERNMENT, FOREIGN BOND, GLOBAL BOND II,
              EMERGING MARKETS BOND, HIGH YIELD, TOTAL RETURN AND TOTAL RETURN
              MORTGAGE 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, 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 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 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 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 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 $1,000,000.
 
38
 PIMCO Funds: Pacific Investment Management Series
<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 .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 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


                                                      July 15, 1997 Prospectus
                                                                              39
<PAGE>
 
            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 the Real Return Bond, Low
            Duration, Short-Term, Money Market 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 Applica-
            tion. If you are a current Class A shareholder desiring to do so
            you can obtain a form of Letter of Intent by contacting the Dis-
            tributor at 800-426-0107 or any broker participating in this pro-
            gram.
 
            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 Advi-
            sor 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, (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 representatives 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 trust-
            ee, administrator, fiduciary, broker, trust     
 
40
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            company or registered investment adviser for which has an agree-
            ment with the Distributor with respect to such purchases, (f) par-
            ticipants investing through accounts known as "wrap accounts" es-
            tablished 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 affili-
            ated 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 de-
            scribed in this paragraph except for sales to purchasers described
            under (d) or (e) in this paragraph.
               In addition, the Short-Term Fund may (subject to appropriate
            documentation) sell its Class A shares without a sales charge
            where the amount invested represents proceeds of a redemption from
            a mutual fund not distributed by PIMCO Funds Distribution Company
            if such redemption occurred no more than 60 days prior to the pur-
            chase of the Short-Term Fund's Class A shares and the shareholder
            either (i) paid an initial sales charge on the redeemed shares (or
            was entitled to a waiver of the initial sales charge) or (ii) was
            at some time subject to a deferred sales charge with respect to
            the redemption proceeds, whether or not a deferred sales charge
            was in fact paid.
 
            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 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 if such investors are otherwise
            eligible to purchase Class A shares without any sales charge be-
            cause 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 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 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
                                                      July 15, 1997 Prospectus
                                                                              41
<PAGE>
 
            instances, 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 informa-
            tion 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 al-
            lowing them access to their clients' accounts for servicing in-
            cluding, without limitation, transfers of registration and divi-
            dend 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' ma-
            terial 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.
ALTERNA-    A CDSC will be imposed on Class B shares of all Funds if an in-
TIVE --     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   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.
 
42
 PIMCO Funds: Pacific Investment Management Series
<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 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-   
ALTERNATIVE rent value of the investor's account for a Fund to fall below the  
CLASS C     total dollar amount of purchase payments subject to the CDSC, ex-  
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).
               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 Real Return Bond, Low Duration, Low Duration
            Mortgage, Short-Term, Money Market and StocksPLUS Funds. For the
            Real Return Bond, Low Duration and StocksPLUS Funds, the Distribu-
            tor expects to make payments of .75%     
                                                      July 15, 1997 Prospectus
                                                                              43
<PAGE>
 
            (representing .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
            payment. For sales of Class C shares made to participants making
            periodic 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 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 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
            Distribution Company, 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 telephone exchanges, by a telephone request to the Trans-
            fer Agent at 800-852-8457. The Trust will employ reasonable proce-
            dures 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 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 Advisor, 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 Advisor to be detrimental to the Trust or a
            particular Fund. Although the Trust has no current intention of
            terminating or modifying the exchange privilege, it reserves the
            right to do so at any time. Except as otherwise permitted by Secu-
            rities and Exchange Commission regulations, the Trust will give 60
            days' advance notice to shareholders of any termination or
 
44
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            material modification of the exchange privilege. For further in-
            formation 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
            establishes automatic periodic exchanges. For further information
            on automatic exchanges see "How to Buy Shares--PIMCO Auto Ex-
            change" 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.
            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.
 
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
 
                                                                             45
                                                      July 15, 1997 Prospectus
<PAGE>
 
            fiduciary titles, if any, and specifying the account number and
            the dollar amount or number of shares to be redeemed; (2) for cer-
            tain 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 orga-
            nizations, 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 trans-
            fer, 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 re-
            quests will not be honored until all required documents in the
            proper form have been received by the Transfer Agent. This redemp-
            tion 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 800-852-8457 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
 
46
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            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 800-852-8457. 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 Fund Link" for information on
            establishing the Fund Link privilege. The Trust may terminate the
            Fund Link program at any time without notice to shareholders. This
            redemption option does not apply to shares held in broker "street
            name" accounts.
 
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 800-852-8457 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 share-
            holder'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 redeemed by wire transfer until such shares have been owned
            (i.e., paid for) for at least 15 days. Expedited wire transfer re-
            demptions 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 ac-
            count designated to receive wire redemption proceeds, it is neces-
            sary 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" ac-
            counts.
 
CERTIFICA-  To redeem shares for which certificates have been issued, the cer-
TED         tificates must be mailed to or deposited with the Trust, duly en-
SHARES      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.

                                                      July 15, 1997 Prospectus
                                                                              47
<PAGE>
 
 
 
AUTOMATIC      
WITHDRAWAL  An investor who owns or buys shares of a Fund having a net asset
PLAN        value of $10,000 or more may open an Automatic Withdrawal Plan and
            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.
               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.     
 
48
 PIMCO Funds: Pacific Investment Management Series
<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 .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>
           Long-Term U.S.
            Government,
            Foreign Bond,
            Global Bond II,
            Emerging Mar-
            kets Bond, High
            Yield, Total
            Return and To-
            tal Return
            Mortgage Funds   .25%      .75%
           ----------------------------------------
           Real Return
            Bond, Low
            Duration, Low
            Duration
            Mortgage 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 Real Return Bond, Short-Term 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
                                                      July 15, 1997 Prospectus
                                                                              49
<PAGE>
 
            known as "compensation" plans. This means that, although the
            Trustees of the Trust are expected to take into account the ex-
            penses of the Distributor and its predecessors in their periodic
            review of the Distribution and Servicing Plans, the fees are pay-
            able to compensate 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.
 
50
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               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:
 
              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/(1)/
           --------------------
           <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>
           Long-Term U.S.
            Government,
            Foreign Bond,
            Global Bond II,
            Emerging
            Markets Bond,
            High Yield,
            Total Return
            and Total
            Return Mortgage
            Funds           .25%      .65%
           ---------------------------------------
           Real Return
            Bond, Low
            Duration, Low
            Duration
            Mortgage 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,


                                                    July 15, 1997 Prospectus
                                                                              51
<PAGE>
 
            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 together 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 administrator) may also pay participating brokers and other in-
            termediaries 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 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 Class B and Class
            C shareholder accounts may exceed the distribution and servicing
            fees collected by the Distributor. As of September 30, 1996, such
            expenses were approximately $11,408,000 in excess of payments un-
            der the PIMCO Advisors Funds' Class B Distribution and Servicing
            Plan and $2,822,000 in excess of payments under the PIMCO Advisors
            Funds' Class C Distribution and Servicing Plan. The allocation of
            such excess (on a pro rata basis) as of September 30, 1996 to the
            Global Income Fund was approximately $128,000 in excess of pay-
            ments under the PIMCO Advisors Funds' Class B Distribution and
            Servicing Plan (3.96% of net assets) and $2,000 in excess of pay-
            ments under the PIMCO Advisors Funds' Class C Distribution and
            Servicing Plan (.06% of net assets).     
 
            How Net Asset Value Is Determined
 
            The net asset value per share of Class A, Class B and Class C
            shares of each Fund is determined as of the close of trading (nor-
            mally 4:00 p.m., Eastern time) on the Exchange by dividing the to-
            tal market value of a Fund's portfolio investments and other as-
            sets attributable to that class, less any liabilities, by the num-
            ber 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 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.
 
52
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               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.
 
            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 effective date of pur-
            chase, which is 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 investment income to shareholders of rec-
            ord at the close of the previous business day, and distributed to
            shareholders monthly. The StocksPLUS Fund intends to declare and
            pay as a dividend substantially 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 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 invest-
            ment income with respect to Class B and Class C shares are ex-
            pected 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.     
               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 shareholder will be subject to tax
            on dividends received from a 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
                                                      July 15, 1997 Prospectus
                                                                              53
<PAGE>
 
               
            return of capital to shareholders, as ordinary income. Dividends
            paid from a Fund's net capital gain (that is, the excess of net
            long-term gain over net short-term loss) that are designated by
            the Fund as capital gain dividends are taxable to shareholders as
            long-term capital gain except as provided by an applicable tax ex-
            emption. Any distributions that are not from a Fund's net invest-
            ment 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, No-
            vember 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. For state income tax purposes, in-
            terest 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 and GNMA Certificates). Each Fund will advise
            shareholders annually of the amount and nature of the dividends
            paid to them.     
               
               Coupon payments received by a Fund from inflation-indexed bonds
            will be includable in the Fund's gross income in the period in
            which they accrue. Periodic adjustments for inflation in the prin-
            cipal value of these securities also may give rise to original is-
            sue 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,
            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     
ADVISOR     Pacific Investment Management serves as investment adviser ("Advi-
            sor") to the Funds pursuant to an investment advisory contract.
            The Advisor is an investment counseling firm founded in 1971, and
            had approximately $    billion in assets under management as of
            May 31, 1997. Pacific Investment Management is a subsidiary part-
            nership of PIMCO Advisors L.P. ("PIMCO Advisors"). A majority in-
            terest in PIMCO Advisors is held by PIMCO Partners, G.P., a gen-
            eral partnership between Pacific Investment Management Company, a
            California corporation and indirect wholly owned subsidiary of Pa-
            cific Mutual Life Insurance Company ("Pacific Mutual"), and PIMCO
            Partners, LLC, a limited liability company controlled by the PIMCO
            Managing Directors. Pa-cific 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 Securi-ties and Exchange Commission and as a commodity
            trading advisor with the CFTC.     
 
54
 PIMCO Funds: Pacific Investment Management Series
<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,
           LOW DURATION FUND              Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          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.
           --------------------------------------------------------------------
           TOTAL RETURN MORTGAGE FUND     William C. Powers, Managing Director,
           LOW DURATION MORTGAGE FUND     Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Powers joined Pacific Investment Man-
                                          agement in 1991 and has managed the
                                          Total Return Mortgage and Low Dura-
                                          tion Mortgage Funds since their in-
                                          ception, July 15, 1997.
           --------------------------------------------------------------------
           LONG-TERM U.S. GOVERNMENT FUND Frank B. Rabinovitch, Managing Direc-
                                          tor, Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Rabinovitch joined Pacific Investment
                                          Management in 1984 and has managed
                                          the Long-Term U.S. Government Fund
                                          since its inception, July 1, 1991.
           --------------------------------------------------------------------
           EMERGING MARKETS BOND FUND     Michael J. Rosborough, Senior Vice
                                          President, Pacific Investment Manage-
                                          ment. A Fixed Income Portfolio Manag-
                                          er, Mr. Rosborough has managed the
                                          Emerging Markets Bond Fund since its
                                          inception, July 15, 1997. Prior to
                                          joining Pacific Investment Management
                                          in 1994, Mr. Rosborough was associ-
                                          ated with RBC Dominion in Tokyo as a
                                          Vice President and Manager in foreign
                                          fixed income.
           --------------------------------------------------------------------
           FOREIGN BOND FUND              Lee R. Thomas, III, Managing Director
           GLOBAL BOND FUND II            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, and the Global Bond Fund II
                                          since October 1, 1995. Prior to
                                          joining Pacific Investment Management
                                          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.
           --------------------------------------------------------------------
           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.
           --------------------------------------------------------------------
           SHORT-TERM FUND                David H. Edington, Managing Director,
           STOCKSPLUS FUND                Pacific Investment Management. A
                                          Fixed Income Portfolio Manager, Mr.
                                          Edington joined Pacific Investment
                                          Management in 1987 and has managed
                                          the Short-Term and StocksPLUS Funds
                                          since their inception, October 7,
                                          1987 and May 14, 1993, respectively.
           --------------------------------------------------------------------
           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
                                          proprietary Portfolio Manager.
</TABLE>    
 
 
            Pacific Investment Management also serves as administrator to the
            Funds pursuant to an administration agreement with the Trust. Pa-
            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. Pacific Investment Management may also re-
            tain certain of its affiliates to provide certain of these servic-
            es. 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 adminis-
            trative
FUND
ADMINISTRATOR
                                                      July 15, 1997 Prospectus
                                                                              55
<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.
               
               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
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 A, Class B and
            Class C shares for administrative fees, as follows:
 
<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>
           Short-Term and Money Market Funds      .35%
           -----------------------------------------------------
           Foreign Bond and Global Bond II 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   Pursuant to the advisory contract, the Advisor places orders for
TRANSACT-   the purchase and sale of portfolio investments for the Funds' ac-
IONS        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 also may consider sales of shares of the
            Trust as a factor in the selection of broker-dealers to execute
            portfolio transactions for the Trust.
 
56
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
               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.
 
            Description of the Trust
 
 
CAPITAL-    The Trust was organized as a Massachusetts business trust on Feb-
IZATION     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, each Fund of-
SHARES      fers Institutional Class and Administrative Class shares. These
            other classes of the Funds may have different sales charges and
            expense levels, which will affect performance accordingly. Invest-
            ors may contact the Distributor at 800-426-0107 for more informa-
            tion concerning other classes of shares of the Funds. This Pro-
            spectus 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 pro-
            portionate voting for fractional shares). As of June 30, 1997, the
            following were shareholders of record of at least 25% of the out-
            standing voting securities of the indicated Fund: California Com-
            munity Foundation (Los Angeles, California) and Marin Community
            Foundation (Larkspur, California) with respect to the Money Market
            Fund; Wendel & Co. (New York, New York) with respect to the Long-
            Term U.S. Government Fund; Donaldson, Lufkin & Jenrette (Jersey
            City, New Jersey) and Charles Schwab & Co., Inc. (San Francisco,
            California) with respect to the Foreign Bond Fund; and Pacific Fi-
            nancial Asset Management Corporation with respect to the Global
            Bond Fund II. To the extent such shareholders are also the benefi-
            cial 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.
 
                                                                             57
                                                      July 15, 1997 Prospectus
<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.
 
58
 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.
 
                                                                             59
                                                      July 15, 1997 Prospectus
<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.
 
 
            CORPORATE AND MUNICIPAL BOND RATINGS
 
STANDARD &  Investment Grade
POOR'S      AAA: Debt rated AAA has the highest rating assigned by Standard
CORPORATION & Poor's. Capacity to pay interest and repay principal is ex-
            tremely 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
 
60
 PIMCO Funds: Pacific Investment Management Series
<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
            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.
 
                                                                             61
                                                      July 15, 1997 Prospectus
<PAGE>
 
               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.
 
62
 PIMCO Funds: Pacific Investment Management Series
<PAGE>
 
            -------------------------------------------------------------------
PIMCO FUNDS INVESTMENT ADVISOR AND ADMINISTRATOR
PACIFIC     Pacific Investment Management Company, 840 Newport Center Drive,
INVESTMENT  Suite 360, Newport Beach, CA 92660
MANAGEMENT  -------------------------------------------------------------------
SERIES      DISTRIBUTOR
 
            PIMCO Funds Distribution Company, 2187 Atlantic Street, Stamford,
            CT 06902
            -------------------------------------------------------------------
            CUSTODIAN
 
            Investors Fiduciary Trust Company, 127 West 10th Street, Kansas
            City, MO 64105
            -------------------------------------------------------------------
            SHAREHOLDER SERVICING AGENT AND TRANSFER AGENT
 
            Shareholder Services, Inc., P.O. Box 5866, Denver, CO 80217
            -------------------------------------------------------------------
            INDEPENDENT ACCOUNTANTS
 
            Price Waterhouse LLP, 1055 Broadway, Kansas City, MO 64105
            -------------------------------------------------------------------
            LEGAL COUNSEL
 
            Dechert Price & Rhoads, 1500 K Street N.W., Washington, D.C. 20005
            -------------------------------------------------------------------
            For further information about the PIMCO Funds, call 1-800-426-
            0107.
 
 
            P I M C O
<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-four 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 Moderate Duration Fund; the PIMCO High Yield Fund;
the PIMCO Total Return Fund; the PIMCO Total Return Fund II; the PIMCO Total
Return Fund III; the PIMCO Commercial Mortgage Securities Fund; the PIMCO Low 
Duration Mortgage Fund; the PIMCO Total Return Mortgage Fund; the PIMCO Long-
Term U.S. Government Fund; the PIMCO Real Return Bond Fund; the PIMCO Foreign
Bond Fund; the PIMCO Global Bond Fund; the PIMCO Global Bond Fund II; the PIMCO
International Bond Fund; the PIMCO Emerging Markets Bond Fund; the PIMCO
Emerging Markets Bond Fund II; the PIMCO StocksPLUS Fund; the PIMCO StocksPLUS
Short Strategy Fund; and the PIMCO Strategic Balanced 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 360, 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.  The Funds offer five
classes of shares, offered through two Prospectuses.  Class A, Class B, and
Class C shares are offered through the "Retail Prospectus" and Institutional
Class and Administrative Class shares are offered through the "Institutional
Prospectus," each dated July 15, 1997 (collectively, the "Prospectuses").  A
copy of the applicable Prospectus may be obtained free of charge at the address
and telephone number listed below.     
    
Institutional Prospectus:                       Retail Prospectus:
                                             
PIMCO Funds                                     PIMCO Funds Distribution Company
840 Newport Center Drive                        2187 Atlantic Street
Suite 360                                       Stamford, Connecticut 06902
Newport Beach, California 92660                 Telephone: (800) 426-0107
Telephone: (800) 927-4648 (Current Shareholders)
           (800) 800-0952 (New Accounts)                                        


    July 15, 1997     

<PAGE>
 
<TABLE>    
<CAPTION>

                               TABLE OF CONTENTS

                                                                                         Page
<S>                                                                                      <C>
INVESTMENT OBJECTIVES AND POLICIES........................................................  1
     Borrowing............................................................................  1
     Corporate Debt Securities............................................................  2
     Participation on Creditors Committee.................................................  3
     Mortgage-Related and Other Asset-Backed Securities...................................  4
     Foreign Securities...................................................................  8
     Foreign Currency Transactions........................................................ 10
     Foreign Currency Exchange-Related Securities......................................... 10
     Bank Obligations..................................................................... 12
     Loan Participations.................................................................. 13
     Short Sales.......................................................................... 14
     Derivative Instruments............................................................... 15
     Warrants to Purchase Securities...................................................... 22
     Illiquid Securities.................................................................. 23
     Social Investment Policies........................................................... 23

INVESTMENT RESTRICTIONS................................................................... 23
     Fundamental Investment Restrictions.................................................. 23
     Non-Fundamental Investment Restrictions.............................................. 26

MANAGEMENT OF THE TRUST................................................................... 30
     Trustees and Officers................................................................ 30
     Compensation Table................................................................... 33
     Investment Adviser................................................................... 34
     Fund Administrator................................................................... 36

DISTRIBUTION OF TRUST SHARES.............................................................. 39
     Distributor and Multi-Class Plan..................................................... 39
     Contingent Deferred Sales Charge and Initial Sales Charge............................ 40
     Distribution and Servicing Plans for Class A, Class B and Class C Shares............. 41
     Distribution and Administrative Services Plans for Administrative Class Shares....... 43
     Purchases, Exchanges and Redemptions................................................. 44

PORTFOLIO TRANSACTIONS AND BROKERAGE...................................................... 46
     Investment Decisions................................................................. 46
     Brokerage and Research Services...................................................... 46
     Portfolio Turnover................................................................... 47

NET ASSET VALUE........................................................................... 48

TAXATION.................................................................................. 48
     Distributions........................................................................ 49
     Sales of Shares...................................................................... 50
     Backup Withholding................................................................... 50
     Options, Futures and Forward Contracts, and Swap Agreements.......................... 50
     Short Sales.......................................................................... 51
     Passive Foreign Investment Companies................................................. 51
     Foreign Currency Transactions........................................................ 52
     Foreign Taxation..................................................................... 52
     Original Issue Discount.............................................................. 53
     Other Taxation....................................................................... 53
</TABLE>     

                                       i
<PAGE>
 
<TABLE>     
<CAPTION>  
<S>                                                                                        <C> 
OTHER INFORMATION......................................................................... 54
     Capitalization....................................................................... 54
     Performance Information.............................................................. 54
     Voting Rights........................................................................ 63
     Certain Ownership of Trust Shares.................................................... 63
     The Reorganization of the PIMCO Money Market and Total Return II Funds............... 73
     The Reorganization of the PIMCO Global Bond Fund II.................................. 73
     Code of Ethics....................................................................... 73
     Custodian, Transfer Agent and Dividend Disbursing Agent.............................. 73
     Independent Accountants.............................................................. 74
     Counsel.............................................................................. 74
     Registration Statement............................................................... 74
     Financial Statements................................................................. 74
</TABLE>     

                                      ii
<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. To the extent a
Fund covers its commitment under a reverse repurchase agreement (or economically
similar transaction) by the maintenance of a segregated account consisting 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 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.     
   
     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 will maintain a
segregated account with its custodian consisting of 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 with broker-dealers (but not banks). 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
maintenance of a segregated account consisting 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. 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.     

     A "mortgage dollar roll," is similar to reverse repurchase agreements 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 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 

                                       1
<PAGE>
 
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
liquid assets equal in value to the securities subject to repurchase by the
Fund, maintained in a segregated account with the Fund's custodian. As with 
reverse repurchase agreements, to the extent that positions in dollar roll 
agreements are not covered through the maintenance of a segregated account 
consisting 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. 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.     

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.
    
     Securities rated Baa and BBB are the lowest which are considered
"investment grade" obligations. Moody's Investor Services, 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 Corporation ("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."     

                                       2
<PAGE>
 
     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") 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.  The market for these securities is
relatively new, and many of the outstanding high yield securities have not
endured a major business recession. A long-term track record on default rates,
such as that for investment grade corporate bonds, does not exist for this
market. 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 Committee
    
     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 is necessary or desirable to
enforce the Fund's rights as a creditor or to protect the value of securities
held by the Fund.     

                                       3
<PAGE>
 
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."  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 

                                       4
<PAGE>
 
    
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.     

     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 

                                       5
<PAGE>
 
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 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.

                                       6
<PAGE>
 
   
     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 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     

                                       7
<PAGE>
 
sensitive to the rate of principal payments (including pre payments) 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 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 Fund II and PIMCO Total Return
Fund II) 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, Total Return
Mortgage, and Long-Term U.S. Government Funds may invest in securities of
foreign issuers only if they are U.S. dollar-denominated.     

                                       8
<PAGE>
 
         

     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 enter into
forward foreign currency exchange contracts 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.

     A forward foreign currency 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.  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 forward contracts 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
forward contracts 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.

     Each of the Fixed Income Funds (except the PIMCO Low Duration II and Total
Return II Funds) may invest in Brady Bonds.  Brady Bonds are securities created
through the exchange of 

                                       9
<PAGE>
 
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").

     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.

   FOREIGN CURRENCY TRANSACTIONS    
   
     Each Fund that may invest in securities denominated in foreign currencies 
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.  
Forwards will be used primarily to adjust the foreign exchange exposure of each
Fund with a view to protecting the portfolio from adverse currency movements, 
based on the Adviser's 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 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 is 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 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.  These 
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.     
   
     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 (a) the issuer is organized under the laws of,
or maintains its principal place of business in, the country, (2) its securities
are 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 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 

                                      10
<PAGE>
 
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 parti cular 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 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 

                                      11
<PAGE>
 
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, High Yield, Commercial Mortgage
Securities, Low Duration Mortgage, Total Return Mortgage, 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, High Yield, Commercial Mortgage Securities, Low Duration Mortgage,
Total Return Mortgage, 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 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 

                                      12
<PAGE>
 
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 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.

                                      13
<PAGE>
 
     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 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 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.

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 


                                      14
<PAGE>
 
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 assets
determined to be liquid by the Adviser in accordance with procedures established
by the Board of Trustees, in a segregated account.  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 in such segregated account 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."
    
     With respect to each Fund, except the PIMCO StocksPLUS Short Strategy Fund,
the Trust has agreed with a state securities commission that as an operating
policy, the dollar amount of short sales (other than short sales against the
box) at any time shall not exceed 25% of the net equity of a Fund, and the value
of securities of any one issuer in which a Fund is short shall not exceed 2% of
the Fund's net assets or 2% of the securities of any class of any issuer.     

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
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 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.     

     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 


                                      15
<PAGE>
 
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 placed in a segregated account 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 assets determined to be liquid by the
Adviser in accordance with procedures established by the Board of Trustees, in a
segregated account with its custodian.  A put option on a security or an index
is "covered" if the Fund maintains assets determined to be liquid by the Adviser
in accordance with procedures established by the Board of Trustees, equal to the
exercise price in a segregated account with its custodian.  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 assets
determined to be liquid by the Adviser in accordance with procedures established
by the Board of Trustees, in a segregated account with its custodian.
    
     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 


                                      16
<PAGE>
 
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."

     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.  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 finan cial 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 


                                      17
<PAGE>
 
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.

     A Fund may purchase and write call and put futures options.  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 


                                      18
<PAGE>
 
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 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 


                                      19
<PAGE>
 
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 establish and maintain segregated accounts 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 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 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.


                                      20
<PAGE>
 
     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 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 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
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, 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 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 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 


                                      21
<PAGE>
 
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 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.


                                      22
<PAGE>
 
     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.  Included within that
amount, but not to exceed 2% of the Fund's net assets, may be warrants that are
not listed on the New York or American Stock Exchanges.  Warrants acquired in
units or attached to securities will be deemed to be 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).

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,
pharma ceuticals, 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, except that
this restriction does not apply (a) to securities issued or 


                                      23
<PAGE>
 
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. banks;

    (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 Fund, the Commercial
Mortgage Securities Fund, the Foreign Bond Fund, the Global Bond Fund, Global
Bond Fund II, the International Bond Fund, the Emerging Markets Bond Fund or the
Emerging Markets Bond Fund II.);     
        
  (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 Fund, the Commercial
Mortgage Securities Fund, the Foreign Bond Fund, the Global Bond Fund, Global
Bond Fund II, the International Bond Fund, the Emerging Markets Bond Fund or the
Emerging Markets Bond Fund II.);     

  (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 "L".);

  (6) for the High Yield, Total Return III, International 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
margin deposits for futures 


                                      24
<PAGE>
 
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 "M".);

  (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 High Yield, Total Return III, 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, Moderate Duration, Total Return, Total Return II,  Commercial
Mortgage Securities, Low Duration Mortgage, Total Return Mortgage, Long-Term
U.S. Government, Foreign Bond, Global Bond, International, Emerging Markets
Bond, Emerging Markets Bond II, StocksPLUS Short Strategy and Strategic Balanced
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.     

                                      25
<PAGE>
 
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:

  (A)(a) invest for the purpose of exercising control or management;

    (b)  for the Global Bond Fund II, make investments for the purpose of
gaining control of a company's management;
         
    
  (B)  for the Global Bond Fund II, invest in securities of other investment
companies, except by purchase in the open market involving only customary
brokers' commissions (For purposes of this restriction, foreign banks and
foreign insurance companies or their respective agents or subsidiaries are not
considered investment companies.  Under the 1940 Act no registered investment
company may (a) invest more than 10% of its total assets (taken at current
value) in securities of other investment companies, (b) own securities of any
one investment company having a value in excess of 5% of its total assets (taken
at current value), or (c) own more than 3% of the outstanding voting stock of
any one investment company.);     

  (C)(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
above), and (e) IO/PO Strips (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 


                                      26
<PAGE>
 
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);
         
    
  (D) for the Global Bond Fund II, invest in securities of an issuer, which,
together with any predecessors or controlling persons, has been in operation for
less than three consecutive years and in equity securities for which market
quotations are not readily available (excluding restricted securities) if, as a
result, the aggregate of such investments would exceed 5% of the value of the
Fund's net assets; provided, however, that this restriction shall not apply to
any obligation of the U.S. Government or its instrumentalities or agencies (Debt
securities having equity features are not considered "equity securities" for
purposes of this restriction.);     
         
    
  (E) for the Global Bond Fund II, invest in securities of any issuer if, to
the knowledge of the Trust, any officers and Trustees of the Trust and officers
and directors of the Adviser who individually own beneficially more than 1/2 of
1% of the securities of that issuer, own beneficially in the aggregate more than
5% of the securities of such issuer;     
         
    
  (F) 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.);     
    
  (G) 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).);     
    
  (H) borrow money (excluding uncovered dollar rolls, reverse repurchase
agreements 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).);     


                                      27
<PAGE>
 
         
    
  (I)  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;     
    
  (J)  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;     
    
  (K)  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;     
    
  (L)  for the Global Bond Fund II, invest in warrants or rights excluding
options (other than warrants or rights acquired by the Fund as a part of a unit
or attached to securities at the time of purchase) if as a result such
investments (valued at the lower of cost or market) would exceed 5% of the value
of the Fund's net assets; provided that not more than 2% of the Fund's net
assets may be invested in warrants not listed on the New York or American Stock
Exchanges;     
    
  (M)  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.);     
    
  (N)  for the Global Bond Fund II, buy or sell oil, gas or other mineral
leases, rights or royalty contracts;     
    
  (O)  for the Global Bond Fund II, purchase or sell real estate, including
investments in limited partnerships that invest directly in real estate;
provided, however, that the Fund may invest in readily marketable interests in
real estate investment trusts or readily marketable securities of companies that
invest in real estate; or     
    
  (P)  for the Global Bond Fund II, engage in short-term trading as a matter of
policy; provided, however, that in pursuing the Fund's investment objective, the
Adviser will continue to monitor all securities positions of the Fund and will
seek to dispose of any position that it believes is no longer consistent with
achieving optimum performance.     
    
     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.     



                                      28
<PAGE>
 
     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.

     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 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.
    
         

                                      29
<PAGE>
 
     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.


                            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 360, 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      Managing Director, PIMCO;
Age 37                          Board and Trustee    Director, Harris Holdings;
                                                     Director, Harris Oil
                                                     Company; Chairman and
                                                     Director, PIMCO Commercial
                                                     Mortgage Securities Trust,
                                                     Inc.  Formerly Principal,
                                                     Senior Vice President and
                                                     Vice President of PIMCO.
 
Guilford C. Babcock             Trustee              Associate Professor of
School of Business                                   Finance, University of
Administration, University                           Southern California;
 of                                                  Director, PIMCO Commercial
Southern California,                                 Mortgage Securities Trust,
Los Angeles, California                              Inc.; Director, AMCAP Fund
90089-1421                                           and Fundamental Investors
Age 65                                               Fund of the Capital Group;
                                                     Director, Good Hope
                                                     Medical Foundation.
 
Vern O. Curtis                  Trustee              Private Investor; Director
14158 N.W. Bronson Creek Drive                       of 16 Real Estate
Portland, Oregon                                     Investment Trusts
97229                                                affiliated with Public
Age 62                                               Storage, Inc.; Director,
                                                     PIMCO Commercial Mortgage
                                                     Securities Trust, Inc.
                                                     Formerly Charitable Work,
                                                     The Church of Jesus Christ
                                                     of Latter Day Saints.
</TABLE>     
 
                                      30
<PAGE>
 
<TABLE>    
<CAPTION>
                           Positions with         Principal Occupation(s)  
Name, Address and Age         the Trust          During the Past Five Years

- --------------------------------------------------------------------------------
<S>                        <C>                   <C> 

Thomas P. Kemp               Trustee                Co-Chairman, U.S. Committee 
359 San Miguel                                      Assist Russian Reform;
Suite 110                                           Director
Newport Beach, California                           Union Financial Corp; 
92660-7807                                          Director
Age 66                                              PIMCO Commercial Mortgage
                                                    Securities Trust, Inc.
                                                    Formerly Senior Consultant,
                                                    World Cup 1994 Organizing
                                                    Committee; Chairman and CEO
                                                    of Coca Cola Bottling
                                                    Company of L.A.
 
William J. Popejoy           Trustee                Chairman, Western Vinyl
29 Chatham Court                                    Manufacturing; Partner,
Newport Beach,                                      Butler Popejoy Group;
 California                                         Director, PIMCO Commercial
92660                                               Mortgage Securities Trust,
Age 58                                              Inc.  Formerly Chief
                                                    Executive Officer, Orange
                                                    County, California;
                                                    Principal, Castine Partners.
 
R. Wesley Burns              President              Executive Vice President,
Age 37                                              PIMCO.  Formerly Vice
                                                    President, PIMCO.
 
William H. Gross             Senior Vice President  Managing Director, PIMCO.
Age 52
 
Margaret Isberg              Senior Vice President  Executive Vice President,
Age 40                                              PIMCO.
 
Leland T. Scholey            Senior Vice President  Senior Vice President,
Age 44                                              PIMCO.  Formerly Vice
                                                    President, PIMCO.
 
Andrew C. Ward               Senior Vice President  Vice President, PIMCO.
Age 36
 
Michael G. Dow               Vice President         Account Manager, PIMCO.
Age 33                                              Formerly Fixed Income
                                                    Specialist, Salomon
                                                    Brothers, Inc.; Vice
                                                    President Operations,
                                                    Citibank NA Global Consumer
                                                    Banking Group.
 
U. Teri Frisch               Vice President         Account Manager, PIMCO.
Age 43
 
Raymond C. Hayes             Vice President         Account Manager, PIMCO.
Age 52                                              Formerly Marketing
                                                    Director, Pacific Financial
                                                    Asset Management
                                                    Corporation.
</TABLE>     


                                      31
<PAGE>
 
<TABLE>    
<CAPTION> 
                            Positions with      Principal Occupation(s)
Name, Address and Age        the Trust        During the Past Five Years

- --------------------------------------------------------------------------------
<S>                          <C>                    <C>

Dean S. Meiling              Vice President         Managing Director, PIMCO.
Age 48
 
James F. Muzzy               Vice President         Managing Director, PIMCO.
Age 57
 
Douglas J. Ongaro            Vice President         Account Manager, PIMCO.
Age 36                                              Formerly Regional Marketing
                                                    Manager, Charles Schwab &
                                                    Co., Inc.
 
Jeffrey M. Sargent           Vice President         Vice President and Manager
Age 34                                              of Fund Shareholder
                                                    Servicing, PIMCO.  Formerly
                                                    Project Specialist, PIMCO.
 
William S. Thompson, Jr.     Vice President         Chief Executive Officer and
Age 51                                              Managing Director, PIMCO.
                                                    Formerly Managing Director,
                                                    Salomon Brothers, Inc.
 
Teresa A. Wagner             Vice President         Vice President and Manager
Age 34                                              of Fund Administration,
                                                    PIMCO.  Vice President and
                                                    Assistant Clerk, PIMCO
                                                    Funds:  Multi-Manager
                                                    Series; Assistant Clerk,
                                                    Cash Accumulation Trust.
                                                    Formerly Vice President,
                                                    PIMCO Advisors
                                                    Institutional Services;
                                                    Finance Director, Pacific
                                                    Financial Asset Management
                                                    Corporation.
 
Kristen M. Wilsey            Vice President         Vice President, PIMCO.
Age 37                                              Formerly Account Manager,
                                                    PIMCO; Vice President,
                                                    Pacific Financial Asset
                                                    Management Corporation.
 
John P. Hardaway             Treasurer              Vice President and Manager
Age 39                                              of Fund Operations, PIMCO.
 
Garlin G. Flynn              Secretary              Senior Fund Administrator,
Age 50                                              PIMCO.  Formerly Senior
                                                    Mutual Fund Analyst, PIMCO
                                                    Advisors Institutional
                                                    Services; Senior Mutual
                                                    Fund Analyst, Pacific
                                                    Financial Asset Management
                                                    Corporation.
</TABLE>     

                                      32
<PAGE>
 
<TABLE>
<CAPTION>

                            Position with         Principal Occupation(s)  
Name, Address and Age         the Trust          During the Past Five Years

- --------------------------------------------------------------------------------
<S>                        <C>                   <C> 

Joseph D. Hattesohl          Assistant Treasurer  Manager of Fund Taxation,
Age 33                                            PIMCO.  Formerly Director of
                                                  Financial Reporting, Carl I.
                                                  Brown & Co.; Tax Manager,
                                                  Price Waterhouse LLP.

Michael J. Willemsen         Assistant Secretary  Project Lead, PIMCO.
Age 37                                            Formerly Shareholder Services
                                                  Specialist, PIMCO.
</TABLE>
- --------------------
          *Mr. Harris is an "interested person" of the Trust (as that term is
defined in the 1940 Act) because of his affiliations with PIMCO.

Compensation Table
    
          The following table sets forth information regarding compensation
received by the Trustees for the year ended March 31, 1997.     

<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       $30,000                 $40,000
     Trustee
 
     Vern O. Curtis            $30,000                 $40,000
     Trustee
 
     Thomas P. Kemp            $30,000                 $40,000
     Trustee
 
     William J. Popejoy        $30,000                 $40,000
     Trustee
</TABLE>     
- --------------------
    
     /1/ Each Trustee, other than those affiliated with the Adviser or its
affiliates, received an annual retainer of $20,000 plus $2,500 for each Board of
Trustees meeting attended. For the fiscal year ended March 31, 1997, the
unaffiliated Trustees as a group received compensation in the amount of
$120,000. Effective May 1, 1997, 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.     
    
     /2/ Each Trustee also serves as a Director of PIMCO Commercial Mortgage
Securities Trust, Inc., a registered closed-end management investment company.
For their services, the Directors who are unaffiliated with the Adviser or its
affiliates received an annual retainer of $6,000 plus $1,000 for each Board of
Directors meeting attended. For the fiscal year ended December 31, 1996, the
unaffiliated Trustees as a group received compensation in the amount of $40,000.
Effective May 1, 1997, each Trustee, other than those affiliated with the
Adviser or its affiliates, receives $500 for each Board of Directors meeting
attended telephonically, and an annual retainer of $500 for a Committee
Chair.    
                                      33
<PAGE>
 
         

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. A majority interest of PIMCO Advisors
is held by PIMCO Partners, G.P., a general partnership between Pacific
Investment Management Company, a California corporation and indirect wholly
owned subsidiary of Pacific Mutual Life Insurance Company ("Pacific Mutual"),
and PIMCO Partners, LLC ("PIMCO Partners"), a limited liability company
controlled by the PIMCO Managing Directors.

     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, and November 19,
1996, and was last approved by the Trustees on August 27, 1996 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 current Advisory Contract was executed in connection with the
consolidation of PIMCO, Pacific Investment Administrative Services Company
("PIASCo"), Thomson Advisory Group L.P. and certain other affiliated entities
(the "Consolidation").  Prior to the Consolidation, and since the inception of
each of the Funds, PIMCO had served as investment adviser to the Funds, pursuant
to an advisory contract, last approved by the Trustees April 14, 1993, and by
shareholders of the then-operational Funds on August 21, 1992 (the "Prior
Advisory Contract").  The terms and conditions of the Advisory Contract are
identical in all material respects to the Prior Advisory Contract, with the
exception of the identity of the service provider, its effective date and
termination date, and the amendment recently effected in connection with the
adoption of a new service and fee arrangement for the Funds.

     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:


                                      34
<PAGE>
 
<TABLE>     
<CAPTION> 
                                                                       Advisory
Fund                                                                   Fee Rate
- ----                                                                   --------
<S>                                                                    <C> 
Money Market Fund ..................................................... 0.15%
Commercial Mortgage Securities, StocksPLUS, StocksPLUS Short Strategy,
 and Strategic Balanced 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, 1997, 1996, and 1995, the aggregate
amount of the advisory fees paid by each operational Fund was as follows:     

<TABLE>    
<CAPTION>
                               Year Ended    Year Ended      Year Ended      
Fund                             3/31/97       3/31/96         3/31/95       
- ----                           ----------    ----------      ----------
<S>                            <C>           <C>             <C>             
                                                                             
Money Market Fund*             $             $    10,118     $       N/A     
Short-Term Fund                                  249,319         383,063     
Low Duration Fund                              6,267,607       5,756,981     
Low Duration Fund II                             575,730         461,261     
High Yield Fund                                1,186,819         830,832     
Total Return Fund                             22,775,075      15,223,950     
Total Return Fund II*                            486,935             N/A     
Total Return Fund III                            327,029         258,080     
Long-Term U.S. Government Fund                   101,042          91,533     
Foreign Bond Fund                                640,157         921,902     
Global Bond Fund                                 264,783         177,065     
Global Bond Fund II**                                N/A             N/A     
International Bond Fund                        4,937,820       1,142,716     
StocksPLUS Fund                                  324,388         109,177     
</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, 1997, 1996, and 1995, in the following amounts:     


                                      35
<PAGE>
 
<TABLE>    
<CAPTION>
                                   Year Ended      Year Ended      Year Ended 
Fund                                 3/31/97         3/31/96         3/31/95  
- ----                               ----------      ----------      ----------  
<S>                                <C>             <C>             <C>        
                                                                              
Short-Term Fund                      $               $ 10,244        $  8,045 
Low Duration Fund                                           0               0 
High Yield Fund                                             0         (42,986)
Low Duration Fund II                                        0         (16,480)
Total Return Fund                                           0               0 
Total Return Fund III                                   1,775            (633)
Long-Term U.S. Government Fund                         13,554          23,964 
Foreign Bond Fund                                           0               0 
Global Bond Fund                                      (17,114)        (34,409)
International Bond Fund                                     0               0 
StocksPLUS Fund                                        26,176          53,148 
</TABLE>     

Fund Administrator
    
          PIMCO also serves as Administrator to the Funds pursuant to an
administration agreement dated January 14, 1997 (the "Administration
Agreement"). 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 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
- ----                                             --------------------   -------
<S>                                              <C>                    <C>

Money Market Fund and Short-Term Fund                  0.20%             0.35%
Moderate Duration Fund                                 0.20%             0.40%
Low Duration Fund and Total Return Fund                0.18%             0.40%
Global Bond Fund and Global Bond Fund II               0.30%             0.45%
Foreign Bond Fund and International Bond Fund          0.25%             0.45%
Emerging Markets Bond Fund and Emerging Markets
 Bond Fund II                                          0.40%             0.55%
All other Funds                                        0.25%             0.40%
</TABLE>     

          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 


                                      36
<PAGE>
 
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 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 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 August 27, 1996. 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. Prior to August 27, 1996, administrative services were provided
pursuant to predecessor administrative services contracts. The preceding
Administrative Services Contract between the Trust and PIMCO was approved by the
Trustees at their meeting held on May 31, 1994, and was approved by shareholders
of all then-operational Funds on October 17, 1994.     

          A previous Administrative Services Contract ("Prior Contact") between
the Trust and PIASCo was initially approved by the Trustees at a meeting held on
April 29, 1987 (and by the then-sole shareholder of the Trust at a meeting held
on April 30, 1987).  The Prior Contract was last approved by the Board of
Trustees on February 23, 1993.  PIASCo was a wholly owned subsidiary of the


                                      37
<PAGE>
 
predecessor of PIMCO.  In connection with the  Consolidation, PIMCO assumed the
duties of PIASCo as Administrator to the Funds.  The terms and conditions of the
Administrative Services Contract are substantially identical in all material
respects to those of the Prior Contract, with the primary exception of the
identity of the service provider, its effective date and termination date, and
the amendment recently effected in connection with the adoption of a new service
and fee arrangement for the Funds.
    
          For the fiscal years ended March 31, 1997, 1996, and 1995, the
aggregate amount of the administration fees paid by each operational Fund was as
follows:     

<TABLE>    
<CAPTION>
                               Year Ended     Year Ended      Year Ended     
Fund                             3/31/97        3/31/96         3/31/95      
- ----                           ----------     -----------     ----------     
<S>                            <C>            <C>             <C>            
                                                                             
Money Market Fund*             $              $    13,462     $      N/A     
Short-Term Fund                                   137,477        129,554     
Low Duration Fund                               3,520,078      2,272,874     
Low Duration Fund II                              391,248        154,668     
High Yield Fund                                   842,032        302,332     
Total Return Fund                              13,084,413      6,059,785     
Total Return Fund II*                             486,935            N/A     
Total Return Fund III                             217,584         86,027     
Long-Term U.S. Government Fund                     65,155         30,511     
Foreign Bond Fund                                 428,175        324,043     
Global Bond Fund                                  208,234         57,732     
Global Bond Fund II**                                 N/A            N/A     
International Bond Fund                         3,800,674        440,899     
StocksPLUS Fund                                   149,888         24,261     
</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 fisal 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, 1997, 1996, and 1995, in the following 
amounts:     


                                      38
<PAGE>
 
<TABLE>        
<CAPTION>
                                 Year Ended     Year Ended   Year Ended  
Fund                               3/31/97        3/31/96      3/31/95   
- ----                             ----------     ----------   ----------
<S>                              <C>            <C>          <C>          
                                                                         
Short-Term Fund                   $              $  2,923     $  2,295   
Low Duration Fund                                       0            0   
Low Duration Fund II                                    0       (4,703)  
High Yield Fund                                         0      (12,266)  
Total Return Fund                                       0            0   
Total Return Fund III                                 507         (181)  
Long-Term U.S. Government Fund                      3,867        6,838   
Foreign Bond Fund                                       0            0   
Global Bond Fund                                   (4,884)      (9,818)  
International Bond Fund                                 0            0   
StocksPLUS Fund                                     7,469       15,165   
</TABLE>     
     
                          DISTRIBUTION OF TRUST SHARES

Distributor and Multi-Class Plan
    
          PIMCO Funds Distribution Company (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 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).     

          Prior to the Consolidation, Pacific Equities Network ("PEN"), an
indirect subsidiary of Pacific Mutual, served as the Trust's Distributor,
pursuant to a contract approved by the Board of Trustees, including a majority
of the Independent Trustees, at its meeting held on April 29, 1987 (and by the
then-sole shareholder of the Trust at a meeting held on April 30, 1987) (the
"Prior Distribution Contract").  The Prior Distribution Contract was last
approved by the Board of Trustees on February 23, 1993 and by shareholders of
the Trust on November 1, 1988.

          The Trust offers five classes of shares: Class A, Class B, Class C,
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"). Shares
of the Institutional Class are offered primarily for direct investment by
investors such as pension and profit sharing plans, employee 

                                      39
<PAGE>
 
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.     

Contingent Deferred Sales Charge and Initial Sales Charge
    
          As described in the Retail 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 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, 1997, the Distributor received an 
aggregate of $_____, $_____ and $_____ 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 each Fund:     

<TABLE>     
<CAPTION> 
Fund                                  Class A         Class B        Class C
- ----                                  -------         -------        -------
<S>                                   <C>             <C>            <C> 
Money Market Fund
Short-Term Fund
Low Duration Fund
Low Duration Fund II
Low Duration Fund III
Moderate Duration Fund
High Yield Fund
Total Return Fund
Total Return Fund II
Total Return Fund III
Commercial Mortgage Securities Fund  
Long-Term U.S. Government Fund
Real Return Bond Fund
Foreign Bond Fund
Global Bond Fund
Global Bond Fund II
International Bond Fund
StocksPLUS Fund
StocksPLUS Short Strategy Fund
Strategic Balanced Fund
</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 Retail 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.
        
          As described in the Retail Prospectus under the caption "Alternative
Purchase Arrangements -- Initial Sales Charge Alternative - Class A Shares,"
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, 
1997, the Distributor received an aggregate of $_____, and retained $_____, in 
initial sales charges on Class A shares, of which the indicated amounts were 
attributable to each Fund:     

<TABLE>     
<CAPTION> 
                                                             Amount Retained
Fund                                 Sales Charges           by Distributor
- ----                                 -------------           ---------------
<S>                                  <C>                     <C> 
Money Market Fund
Short-Term Fund
Low Duration Fund
Low Duration Fund II
Low Duration Fund III
Moderate Duration Fund
High Yield Fund
Total Return Fund
Total Return Fund II
Total Return Fund III
Commercial Mortgage Securities Fund  
Long-Term U.S. Government Fund
Real Return Bond Fund
Foreign Bond Fund
Global Bond Fund
Global Bond Fund II
International Bond Fund
StocksPLUS Fund
StocksPLUS Short Strategy Fund
Strategic Balanced Fund
</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 Global Bond Fund II while the Fund was a series of PAF.    

                                      40
<PAGE>
 
Distribution and Servicing Plans for Class A, Class B and Class C Shares
    
          As stated in the text of the Retail 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 Retail
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
Retail 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 Retail 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 (disinterested 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 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 defined above 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 persons.     
    
          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 defined above 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 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 Retail Plans went into effect for the Funds in January 1997 and no
payments were made thereunder prior to the date of this Statement of Additional
Information.     
    
    
     For the fiscal year ended March 31, 1997, the Trust paid the Distributor an
aggregate of $_____, $_____ and $_____ 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
Short-Term Fund
Low Duration Fund
High Yield Fund
Total Return Fund
Long-Term U.S. Government Fund
Real Return Bond Fund
Foreign Bond Fund
Global Bond Fund II
StocksPLUS Fund
</TABLE>      
    
          During the fiscal year ended March 31, 1997, the amounts collected 
pursuant to the Distribution and Servicing Plan for Class A shares were used as 
follows: (A) advertising - $_____; (B) printing and mailing of prospectuses to 
other than current shareholders - $_____; (C) compensation to the Distributor - 
$_____; (D) compensation to dealers - $_____; (E) compensation to sales 
personnel - $_____; (F) interest, carrying or other financing charges - $_____;
and (G) other - $_____. These amounts are attributable to the following Funds,
as indicated:    

<TABLE>     
<CAPTION> 
Fund                                  A    B    C    D    E    F    G
- ----                                 ---  ---  ---  ---  ---  ---  ---
<S>                                  <C>  <C>  <C>  <C>  <C>  <C>  <C>   
Money Market Fund
Short-Term Fund
Low Duration Fund
High Yield Fund
Total Return Fund
Long-Term U.S. Government Fund
Real Return Bond Fund
Foreign Bond Fund
Global Bond Fund II
StocksPLUS Fund
</TABLE>      

    
          During the fiscal year ended March 31, 1997, the amounts collected
pursuant to the Distribution and Servicing Plan for Class B shares were used as
follows: (A) advertising - $_____; (B) printing and mailing of prospectuses to
other than current shareholders - $_____; (C) compensation to the Distributor -
$_____; (D) compensation to dealers - $_____; (E) compensation to sales 
personnel - $_____; (F) interest, carrying or other financing charges - $_____;
and (G) other - $_____. These amounts are attributable to the following Funds,
as indicated:    

<TABLE>     
<CAPTION> 
Fund                                  A    B    C    D    E    F    G
- ----                                 ---  ---  ---  ---  ---  ---  ---
<S>                                  <C>  <C>  <C>  <C>  <C>  <C>  <C>   
Money Market Fund
Short-Term Fund
Low Duration Fund
High Yield Fund
Total Return Fund
Long-Term U.S. Government Fund
Real Return Bond Fund
Foreign Bond Fund
Global Bond Fund II
StocksPLUS Fund
</TABLE>      

    
          During the fiscal year ended March 31, 1997, the amounts collected
pursuant to the Distribution and Servicing Plan for Class C shares were used as
follows: (A) advertising - $_____; (B) printing and mailing of prospectuses to
other than current shareholders - $_____; (C) compensation to the Distributor -
$_____; (D) compensation to dealers - $_____; (E) compensation to sales 
personnel - $_____; (F) interest, carrying or other financing charges - $_____;
and (G) other - $_____. These amounts are attributable to the following Funds,
as indicated:    

<TABLE>     
<CAPTION> 
Fund                                  A    B    C    D    E    F    G
- ----                                 ---  ---  ---  ---  ---  ---  ---
<S>                                  <C>  <C>  <C>  <C>  <C>  <C>  <C>   
Money Market Fund
Short-Term Fund
Low Duration Fund
High Yield Fund
Total Return Fund
Long-Term U.S. Government Fund
Real Return Bond Fund
Foreign Bond Fund
Global Bond Fund II
StocksPLUS Fund
</TABLE>      

                                      41 
<PAGE>
    
          For the fiscal year ended September 30, 1996, PAF paid the Distributor
an aggregate of $1,567,984, pursuant to a Distribution and Servicing Plan
applicable to the Class A shares of PAF (the "PAF Class A Plan"), which is
similar to the Class A Retail Plan of the Trust.  The payments allocated to the
Global Bond Fund II were $11,772.     
    
          The remainder of the total payments made under the PAF Class A Plan
for such fiscal years was allocated among other series of PAF which either
merged with Funds of the Trust or merged with/reorganized as series of PIMCO
Funds: Multi-Manager Series, an affiliated mutual fund family, in transactions
which took place on January 17, 1997.     
     
          During the fiscal year ended September 30, 1996, the amounts collected
pursuant to the PAF Class A Plan [and the front-end sales charge imposed on
Class A shares] were used as follows:  commissions and other compensation to
dealers, $1,786,000; preparing, printing and distributing materials to
shareholders, and other expenses (including data processing, legal and
operations), $2,483,000.  The total, if allocated to the Global Bond Fund II
based on the net assets attributable to its Class A shares at September 30,
1996, would have been as follows:  compensation -- $17,000; sales material and
other expenses -- $24,000; total -- $41,000.     
    
     For the fiscal year ended September 30, 1996, PAF paid the Distributor an
aggregate of $2,107,430, pursuant to a Distribution and Servicing Plan
applicable to the Class B shares of PAF (the "PAF Class B Plan") which is
similar to the Class B Retail Plan of the Trust.  The payments allocated to the
Global Bond Fund II were $16,642.     
    
     The remainder of the total payments made under the PAF Class B Plan for
such fiscal years was allocated among other series of PAF which either merged
with Funds of the Trust or merged with/reorganized as series of PIMCO Funds:
Multi-Manager Series, an affiliated mutual fund family, in transactions which
took place on January 17, 1997.     
    
     During the fiscal year ended September 30, 1996, the amounts collected
pursuant to the PAF Class B Plan and the contingent deferred sales charge
imposed on Class B shares of the former PAF Funds were used as follows by the
Distributor:  sales commissions and other compensation to sales personnel,
$8,961,000; 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), $2,003,000.  The total, if allocated to the Global Bond Fund      

                                      42
<PAGE>
 
    
II based on the net assets attributable to its Class B shares at September 30,
1996, would have been as follows: compensation -- $101,000; sales material and
other expenses -- $23,000; total -- $124,000.     

          For the fiscal year ended September 30, 1996, PAF paid the Distributor
$42,194,641, pursuant to a similar Distribution and Servicing Plan (the "PAF
Class C Plan") applicable to the Class C shares of PAF of which $18,448 was
allocated to the Global Bond Fund II (which was formerly a PAF Fund which
reorganized as a series of the Trust on January 17, 1997).     

          The remainder of the total payments made under the PAF Class C Plan
for such fiscal years was allocated among other series of PAF which either
merged with Funds of the Trust or merged with/reorganized as series of PIMCO
Funds: Multi-Manager Series, an affiliated mutual fund family, in transactions
which took place on January 17, 1997.     
    
          During the fiscal year ended September 30, 1996, the amounts collected
pursuant to the PAF Class C Plan and the contingent deferred sales charge
imposed on Class C shares of the former PAF Funds were used as follows by the
Distributor:  sales commissions and other compensation to sales personnel,
$32,453,000; 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), $8,605,000.  The total, if allocated to the Global Bond Fund II
based on the net assets attributable to its Class C shares at September 30,
1996, would have been as follows:  compensation -- $24,000; sales material and
other expenses -- $6,000; total -- $30,000.     
    
          During the fiscal year ended September 30, 1996, unreimbursed expenses
of PAF's principal underwriter under the PAF Class C Plan were reduced from
$4,191,000 to $2,822,000.     
    
     The Trustees believe that the Distribution and Servicing Plans will provide
benefits to the Trust. The Trustees believe that the Class A, Class B and Class
C 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 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.     

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.     

                                      43
<PAGE>
 
        
     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 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, 1997, the Administrative Class shares
of the PIMCO Money Market, Short-Term, Low Duration, High Yield, Total Return
and Total Return II Funds paid aggregate fees under the Distribution Plan to
qualified service providers in the amount of $11, $1,003, $3,442, $701,
$141,529, and $3,408, respectively.  All of these amounts constituted "service
fees" under applicable NASD rules.     

Purchases, Exchanges and Redemptions

     Purchases, exchanges and redemptions of Class A, Class B and Class C shares
are discussed in the Retail Prospectus 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     

                                      44
<PAGE>

     
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 Retail Prospectus 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 International Fund and the Emerging Markets Bond
Fund II, each of which is only available to private account clients of PIMCO) or
any series (except the Opportunity Fund) 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 Retail 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
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 

                                      45
<PAGE>
 
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, currently set at $250 for Class A, Class B and Class C 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).  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.


                     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.

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 trans actions 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      

                                      46
<PAGE>
 
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
futures contracts and other 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.     

     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.

                                      47
<PAGE>
 
                                NET ASSET VALUE

     As indicated under "Net Asset Value" in the Institutional Prospectus and
"How Net Asset Value is Determined" in the Retail Prospectus, the Trust's net
asset value per share for the purpose of pricing purchase and redemption orders
is determined at 4:00 p.m. (Eastern time) on each day the New York Stock
Exchange is open for trading.  Net asset value will not be determined on the
following holidays:  New Year's 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 discussion is general in nature and should not be regarded as
an exhaustive presentation of all possible tax ramifications.  All shareholders
should consult a qualified tax adviser regarding their investment in a 
Fund.     

     Each Fund intends to qualify annually and elect to be treated as a
regulated investment company under the Internal Revenue Code of 1986, as amended
(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) derive in each taxable year less than 30% of its gross income from 

                                      48
<PAGE>
 
the sale or other disposition of certain assets held less than three months,
namely (1) stocks or securities, (2) options, futures, or forward contracts
(other than those on foreign currencies), and (3) foreign currencies (or
options, futures, and forward contracts on foreign currencies) not directly
related to the Fund's principal business of investing in stock or securities;
(c) 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 (d) distribute 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) each taxable year. 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 relating 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, 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 of the calendar year, 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.

Distributions

     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 

                                      49
<PAGE>
 
gains may be characterized as a return of capital to shareholders or, in some
cases, as capital gain. The tax treatment of dividends and distributions 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 

                                      50
<PAGE>
 
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 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 30% limit on gains from the disposition of certain options, futures,
forward contracts, and swap agreements held less than three months and 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. Moreover, the 30% limit on
gains from the disposition of securities held less than three months may limit
the extent to which a Fund will be able to engage in short sales.

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 corre
sponding 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.  In addition, 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

                                      51
<PAGE>
 
result that unrealized gains are treated as though they were realized.  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
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 Foreign Bond, Global Bond, Global Bond
II or International Bond 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 Foreign Bond, Global Bond, Global Bond II, 
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 fluc tuation 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     
                                      52
<PAGE>
 
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

     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 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.

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 distri
butions 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 attri-

                                      53
<PAGE>
 
butable 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.


                               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

                                      54
<PAGE>
 
        
     The yield of the PIMCO Money Market Fund for the seven day period ended 
March 31, 1997 was as follows: Institutional Class - ___%, Administrative 
Class - ___%, Class A- ___%, Class B - ___% and Class C - ___%. The effective
yield of the PIMCO Money Market Fund for the seven day period ended March 31,
1997 was as follows: Institutional Class - ___%, Administrative Class - ___%,
Class A -___%, Class B - ___% and Class C - ___%.    

     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), 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)/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, 1997, the yield of the Funds
was as follows (all numbers are annualized):     

<TABLE>    
<CAPTION>

                                                                    Yield for Period
                                                                   Ended March 31, 1997
                                                                   --------------------        
 
        Fund                              Institutional Class   Administrative Class   Class A   Class B   Class C
        ----                              -------------------   --------------------   -------   -------   -------
        <S>                               <C>                   <C>                    <C>       <C>       <C> 
 
        Money Market Fund                        5.15%                  4.91%
        Short-Term Fund                          6.09%                  5.82%
        Low Duration Fund                        6.20%                  5.95%
        Low Duration Fund II                     6.16%                    N/A
        Low Duration Fund III
        Moderate Duration Fund
        High Yield Fund                          8.54%                  8.23%
        Total Return Fund                        6.57%                  6.32%
        Total Return Fund II                     6.19%                  5.93%
        Total Return Fund III                    6.12%                    N/A
        Long-Term U.S. Government Fund           6.90%                    N/A
        Real Return Bond Fund
        Foreign Bond Fund                        5.70%                    N/A
        Global Bond Fund                         5.69%                  5.62%
        Global Bond Fund II
        International Bond Fund                  5.80%                    N/A
        StocksPLUS Fund                          5.77%                    N/A
        Strategic Balanced Fund                  6.30%                    N/A
</TABLE>     

         
    
     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      

                             
<PAGE>
 
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, 1997. As noted
below, total return presentations for periods prior to the inception date of a
particular class are based on the historical performance of Institutional Class
shares 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, which are paid by all classes except the
Institutional Class (at a maximum rate of 1.00% per annum), and the higher
administration fee charges associated with Class A, Class B, and Class C shares.
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 the higher
expenses, compounded over the relevant period.     
                 
                 Total Return for Periods Ended March 31, 1997     

<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------
                                                            Since Inception   Inception       Inception     
                                                                of Fund         Date of        Date of     
Fund                 Class            1 Year    5 Years       (Annualized)       Fund          Class       
- --------------------------------------------------------------------------------------------------------   
<S>              <C>                   <C>       <C>             <C>           <C>            <C> 
Money            Institutional         5.76%     4.30%           4.46%         01/25/95       01/25/95     
Market           Administrative        5.50%     4.22%           4.38%                        03/01/96     
                 Class A               5.76%     4.30%           4.46%                        01/17/97     
                 Class B               0.76%     3.97%           4.46%                        01/17/97     
                 Class C               5.76%     4.30%           4.46%                        01/17/97     
- --------------------------------------------------------------------------------------------------------   
Short-Term       Institutional         7.44%     5.26%            6.54%        10/07/87       10/07/87     
                 Administrative        7.16%     5.20%            6.51%                       02/01/96     
                 Class A               5.29%     4.84%            6.31%                       01/17/97     
                 Class B               2.44%     4.94%            6.54%                       01/17/97     
                 Class C               6.44%     5.26%            6.54%                       01/17/97     
- -------------------------------------------------------------------------------------------------------- 
Low Duration     Institutional         6.76%     7.00%            8.28%        05/11/87       05/11/87
                 Administrative        6.50%     6.91%            8.23%                       01/03/95
                 Class A               3.56%     6.35%            7.94%                       01/17/97
                 Class B               1.77%     6.70%            8.28%                       01/17/97
                 Class C               5.76%     7.00%            8.28%                       01/17/97
- --------------------------------------------------------------------------------------------------------
Low              Institutional         5.88%     N/A              6.19%        11/01/91       11/01/91
Duration II      Administrative        5.88%                      6.19%                              
                 Class A               2.70%                      5.54%                       01/17/97
                 Class B               0.92%                      5.88%                       01/17/97
                 Class C               4.89%                      6.19%                       01/17/97
- --------------------------------------------------------------------------------------------------------
Low              Institutional
Duration III     Administrative
                 Class A
                 Class B
                 Class C
- --------------------------------------------------------------------------------------------------------
Moderate         Institutional
Duration         Administrative
                 Class A
                 Class B
                 Class C
- --------------------------------------------------------------------------------------------------------
High Yield       Institutional        11.91%     N/A             12.74%        12/15/92       12/15/92
                 Administrative       11.63%                     12.65%                       01/16/95
                 Class A               6.87%                     11.39%                       01/17/97
                 Class B               6.91%                     12.18%                       01/17/97
                 Class C              10.91%                     12.74%                       01/17/97
- --------------------------------------------------------------------------------------------------------
</TABLE>     


<PAGE>
 
<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------
                                                            Since Inception   Inception       Inception     
                                                                of Fund        Date of         Date of     
Fund                 Class            1 Year    5 Years       (Annualized)      Fund            Class       
- --------------------------------------------------------------------------------------------------------   
<S>              <C>                   <C>       <C>             <C>           <C>            <C> 
Total            Institutional        6.48%      8.69%           9.72%         05/11/87       05/11/87
Return           Administrative       6.32%      8.60%           9.67%                        09/08/94
                 Class A              1.69%      7.69%           9.20%                        01/17/97
                 Class B              1.51%      8.40%           9.72%                        01/17/97
                 Class C              5.49%      8.69%           9.72%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Total            Institutional        5.40%      N/A             7.62%         12/30/91       12/30/91
Return II        Administrative       5.03%                      7.51%                        11/30/94
                 Class A              0.65%                      6.58%                        01/17/97
                 Class B              0.46%                      7.30%                        01/17/97
                 Class C              4.41%                      7.62%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Total            Institutional        6.17%      8.69%           9.39%         07/01/91       07/01/91
Return III       Administrative       6.17%      8.69%           9.39%                               
                 Class A              1.39%      7.71%           8.49%                        01/17/97
                 Class B              1.19%      8.42%           9.29%                        01/17/97
                 Class C              5.17%      8.69%           9.39%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Long-Term        Institutional        2.61%     10.83%          12.08%         07/01/91       07/01/91
U.S.             Administrative       2.61%     10.83%          12.08%                               
Government       Class A             -1.99%      9.83%          11.13%                        01/17/97
                 Class B              2.15%     10.58%          11.99%                        01/17/97
                 Class C              1.67%     10.83%          12.08%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Real Return      Institutional
Bond             Administrative
                 Class A
                 Class B
                 Class C
- --------------------------------------------------------------------------------------------------------
Foreign          Institutional       20.84%     N/A             11.10%         12/02/92       12/02/92
Bond             Administrative      20.84%                     11.10%                               
                 Class A             15.41%                      9.79%                        01/17/97
                 Class B             15.85%                     10.53%                        01/17/97
                 Class C             19.85%                     11.10%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Global Bond      Institutional       12.76%     N/A             10.30%         11/23/93       11/23/93
                 Administrative      12.76%                     10.30%                               
                 Class A              7.69%                      8.54%                        01/17/97
                 Class B              7.77%                      9.43%                        01/17/97
                 Class C             11.77%                     10.30%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Global Bond      Class A               N/A      N/A              9.78%*        10/01/95       10/01/95
II               Class B                                         9.49%*                       10/01/95
                 Class C                                        13.49%*                       10/01/95
                 Institutional                                  14.95%*                       01/17/97
                 Administrative                                 14.95%*                       01/17/97
- --------------------------------------------------------------------------------------------------------
International    Institutional       17.94%      8.78%           8.95%         12/13/89       12/13/89
Bond             
- -------------------------------------------------------------------------------------------------------- 
StocksPLUS       Institutional       21.00%     N/A             18.68%         05/13/93       05/13/93
                 Administrative      21.00%                     18.68%                               
                 Class A             17.37%                     17.65%                        01/17/97
                 Class B             16.00%                     18.12%                        01/17/97
                 Class C             20.00%                     18.68%                        01/17/97
- --------------------------------------------------------------------------------------------------------
Strategic        Institutional       NA         N/A              3.50%*        06/28/96       06/28/96
Balanced         Administrative                                  3.50%*                              
                 Class A                                        -1.16%*                       01/17/97
                 Class B                                        -1.50%*                       01/17/97
                 Class C                                         2.50%*                       01/17/97
- --------------------------------------------------------------------------------------------------------
 </TABLE>     

    
* unannualized     

                                      57
<PAGE>
 
             

     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, 1997, the current distribution rates
(annualized) for the Funds were as follows:     

                                      58
<PAGE>
 
<TABLE>    
<CAPTION>
                                                                        Distribution Rate
                                                                        -----------------
 
        Fund                              Institutional Class   Administrative Class   Class A   Class B   Class C
        ----                              -------------------   --------------------   -------   -------   -------
        <S>                               <C>                   <C>                    <C>       <C>       <C> 

        Money Market Fund                        5.17%                 4.93%  
        Short-Term Fund                          6.27%                 6.01%  
        Low Duration Fund                        6.51%                 6.26%  
        Low Duration Fund II                     6.65%                   N/A   
        Low Duration Fund III
        Moderate Duration Fund
        High Yield Fund                          8.71%                 8.42%  
        Total Return Fund                        6.60%                 6.35%  
        Total Return Fund II                     6.45%                 6.20%  
        Total Return Fund III                    6.15%                   N/A   
        Long-Term U.S. Government Fund           7.43%                   N/A   
        Real Return Bond Fund
        Foreign Bond Fund                        3.60%                   N/A   
        Global Bond Fund                         4.76%                 4.75%  
        Global Bond Fund II
        International Bond Fund                    N/A                   N/A   
        StocksPLUS Fund                            N/A                   N/A   
        Strategic Balanced Fund
</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.     

                                      59
<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 
</TABLE>     
        
    Source: Salomon Brothers World Government Bond Index 1985-1996.     
        
     The Trust may use, in its advertisements and other information, data
concerning the projected cost of a college education in future years based on
1997/1996 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 7% 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 7% 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.       

<TABLE>    
<CAPTION>
 
Potential College Cost Table
 
Start       Public        Private       Start      Public       Private     
Year        College       College       Year       College      College     
- -----       -------       -------       -----      -------      --------    
<S>         <C>           <C>           <C>        <C>          <C> 
        
1997        $42,840       $ 90,401       2005      $ 73,609     $153,038
1998        $45,839       $ 96,729       2006      $ 78,761     $166,200    
1999        $49,048       $103,500       2007      $ 84,275     $177,834    
2000        $52,482       $110,745       2008      $ 90,174     $190,283    
2001        $56,156       $118,497       2009      $ 96,486     $203,603    
2002        $60,087       $126,792       2010      $103,240     $217,855    
2003        $64,293       $135,668       2011      $110,466     $233,105    
2004        $68,793       $145,165       2012      $118,199     $249,422    
</TABLE>      
    
Costs assume a steady increase in the annual cost of college of 7% per year from
a 1996/1997 base year amount. Actual rates of increase may be more or less than
7% 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 1972 to 1996 was:     

                                      60
<PAGE>
 
<TABLE>     
         <S>                <C>   
         *Stocks:            12.5%
          Bonds:              9.2%
          T-Bills:            7.0%
          Inflation:          5.6%
</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.     
    
     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 1972-1996, 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 Ibbottson'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 1972
through 1996 is set forth in the following table.     

<TABLE>    
<CAPTION>
                                                 MIXED
 YEAR   STOCKS   BONDS   T-BILLS   INFLATION   PORTFOLIO
- ------  -------  ------  --------  ----------  ----------
<S>     <C>      <C>     <C>       <C>         <C>
 
1972     18.98%   7.26%     3.84%       3.41%      11.26%
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%       .387%      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%
</TABLE>     

                                      61
<PAGE>
 
        
     *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.          

          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:
<TABLE>
<CAPTION>
 
 
            Investment         Annual          Total          Total
            Period          Contribution    Contribution      Saved
            -----------     ------------    ------------     --------
          <S>              <C>             <C>              <C>
              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
 
</TABLE>

     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 1990:

                    % of Income for Individuals
                    Aged 65 Years and Older in 1990*
                    --------------------------------

                    Social Security
Year                and Pension Plans             Other
- ----                ------------------            -----

1990                      38%                      62%

    
     * 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.     

                                      62
<PAGE>
 
     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.
       
     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 Ibbbotson 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.
    
Certain Ownership of Trust Shares
   
     As of June 30, 1997, the following persons owned of record or beneficially
5% or more of the shares of the following Funds:     

                                      63
<PAGE>
 
<TABLE>    
<CAPTION>  
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                           <C>            <C>
Money Market Fund
 
Institutional Class
- -------------------
California Community Foundation               9,920,332.810     41.67%*
606 South Olive Street, Suite 2400
Los Angeles, California  90014
 
Marin Community Foundation                    7,910,697.260     33.23%*
17 East Sir Frances Drake Blvd., Suite 200
Los Angeles, California  94939
 
PIMCO Advisors L.P.                           2,087,181.380      8.77%
800 Newport Center Drive
Newport Beach, CA  92660
 
Administrative Class
- --------------------
IFTC as Trustee for                               9,747.830    100.00%*
Godwins 401(k)
127 West 10th Street, 11th Floor
Kansas City, Missouri  64105-1716
 
Short-Term Fund
 
Institutional Class
- -------------------
Hawaii Carpenters Health & Welfare            1,275,791.492     10.79%
615 Pilkoi Street
Honolulu, Hawaii  96814

Charles Schwab & Co., Inc.**                  1,010,238.637      8.54%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Denison University                              999,755.327      8.45%
P.O. Box F
Granville, Ohio  43023
 
NBD, FBO                                        849,292.740      7.18%
Indianapolis Symphony Orchestra
Post Office Box 771072
Detroit, Michigan  48277-1072
 
Sandra Smith Dompier                            680,416.738      5.75%
1900 West Loop South, Suite 1050
Houston, Texas  77027
</TABLE>      
                                      64
<PAGE>
 
<TABLE>     
<CAPTION> 
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                        <C>               <C>            
TelePad Corporation                             662,090.151      5.60%
380 Herndon Parkway, Suite 1900
Herndon, Virginia  22070
 
Donaldson Lufkin Jenrette                       638,840.299      5.40%
1 Pershing Plaza, 5th Floor
P.O. Box 2052
Jersey City, New Jersey  07303
 
Los Angeles Orthopedic Foundation               622,029.903      5.26%
2400 South Flower Street
Los Angeles, California  90007
 
Administrative Class
- --------------------
Northwestern Trust                              508,507.868     93.65%* 
1202 Third Avenue
Seattle, Washington  98101
 
Frost National Bank as Trustee for               34,479.482      6.35%
Lau & Co.
100 West Houston
San Antonio, Texas  78296


Low Duration Fund

Institutional Class
- -------------------
Charles Schwab & Co., Inc.**                 25,839,970.228      9.17%
The Schwab Building
101 Montgomery Street
  San Francisco, California  94104
 
Administrative Class
- --------------------
Frost National Bank as Trustee for              243,707.018     47.53%*
Lau & Co.
100 West Houston
San Antonio, Texas  78296
 
First Interstate bank as Trustee for            166,931.663     32.56%*
Choicemaster
P.O. Box 9800
Calabasas, California  91302

</TABLE>      
                                      65
<PAGE>
 
<TABLE>     
<CAPTION> 
                                               Shares        Percentage of 
                                             Beneficially     Outstanding  
                                               Owned         Shares Owned  
                                               -----         -------------  
<S>                                        <C>               <C>            
FIIOC as Agent for                              42,988.166       8.38%
Certain Employee Benefits Plan
100 Magetian KW1C
Covington, Kentucky  41015
 
Melrose-Wakefield Hospital                      30,656.741       5.98%
585 Lebannon Street
Melrose, Massachusetts  02176
 

Low Duration Fund II
 
Institutional Class
- -------------------
Sprint Corporation                           8,741,025.208      30.14%*
2330 Shawnee Mission Parkway
Westwood, Kansas  66205

Health Cleveland                             2,494,105.104       8.60%
18101 Lorain Avenue
Cleveland, Ohio  44111
 
Salt River Project                           2,112,458.810       7.28%
P.O. Box 52025
Phoenix, Arizona  85072
 
University of Illinois Foundation            1,813,334.114       6.25%
1305 West Green Street
Urbana, Illinois  61801
 
Northwest Administrators Inc.                1,580,911.543       5.45%
Washington Teamsters Welfare Trust
2323 Eastlake Avenue, E
Seattle, Washington  98102
 
Houston Carpenters                           1,558,732.442       5.37%
4600 Gulf Freeway
Houston, Texas  77023


High Yield Fund

Institutional Class
- -------------------
Charles Schwab & Co., Inc. **               10,399,595.090      14.67%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
</TABLE>      
                                      66
<PAGE>
 
<TABLE>     
<CAPTION> 

                                               Shares        Percentage of    
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                        <C>               <C>            
Administrative Class
- --------------------
FIIOC as Agent for                              369,919.265     57.22%*
Certain Employee Benefits Plan
100 Magetian KW1C
Covington, Kentucky  41015
 
Northwestern Trust and Investors Advisory Co.   160,151.949     24.77%
1201 Third Avenue, Suite 2010
Seattle, Washington  98101
 
Siefker Charitable Remainder Unitrust            93,704.453     14.49%
1106 Richman Knoll
Fullerton, California  92635


Total Return Fund
 
Institutional Class
- -------------------
Charles Schwab & Co., Inc.**                 63,417,956.724      5.47%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Administrative Class
- --------------------
American Express Institutional Services       2,369,002.101     16.44%
P.O. Box 489
Minneapolis, Minnesota  55440-0489
 
FIIOC as Agent for                            2,338,551.809     16.23%
Certain Employee Benefits Plan
100 Magetian KW1C
Covington, Kentucky  41015
 
Stockton Nominee Partnership                  1,347,545.467      9.35%
c/o Stockton Trust, Inc.
3001 East Camelback Road, Suite 100
Phoenix, Arizona  85016
 
University of South Dakota Foundation         1,306,773.919      9.07%
414 East Clark
Alumni Foundation Center
Vermillion, South Dakota  57069
</TABLE>      
                                      67
<PAGE>
 
<TABLE>     
<CAPTION> 
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                        <C>               <C>            

Total Return Fund II
 
Institutional Class
- -------------------
Pacific Mutual as Trustee for                11,323,943.642     24.53%
City of Fort Worth
700 Newport Center Drive
Newport Beach, California  92660
 
Pacific Mutual as Trustee for                 7,584,103.581     16.43%
Carpenters Trust of Western Washington
700 Newport Center Drive
Newport Beach, California  92660
 
Arco                                          3,700,143.557      8.02%
c/o State Street Bank
One Enterprise Drive
North Quincy, MA  02171
 
Pacific Mutual as Trustee for                 2,848,027.844      6.16%
CMTA-GMPP & Allied Workers Pension
700 Newport Center Drive
Newport Beach, California  92660
 
GMP & Employers                               2,636,707.033      5.71%
c/o Smith Barney
312 Walnut Street, Suite 1700
Cincinnati, Ohio  45202
 
Pacific Mutual as Trustee for                 2,529,339.549      5.48%
Carpenters District Council of Houston
700 Newport Center Drive
Newport Beach, California  92660
 
Administrative Class
- --------------------
Eastern Illinois University Foundation          406,642.323     88.62%*
600 Lincoln Avenue
Charleston, Illinois  61920
 
Godwins 401(k)                                   40,672.416      8.86%
c/o IFTC
127 West 10th Street
Kansas City, Missouri  64105-1708

</TABLE>      

                                      68
<PAGE>
 
<TABLE>    
<CAPTION>
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                        <C>               <C>            
Total Return Fund III
 
Institutional Class
- -------------------                             
The Roman Catholic Archdiocese                7,702,672.010     36.84%*
of Los Angeles
3424 Wilshire Boulevard
Los Angeles, California  90010-2241
 
Holy Cross                                    3,194,681.141     15.28%
St. Mary's Lourdes Hall
Notre Dame, Indiana  46556
 
Diocese of Orange                             2,691,280.735     12.87%
2811 East Villa Road
Orange, California  92667
 
Catholic Diocese of Wilmington                1,854,415.630      8.87%
P.O. Box 2030
Wilmington, Delaware  19899
 
Society of Mount Carmel                       1,345,714.075      6.43%
1317 Frontage Road
Darien, Illinois  60561
 
Sisters of St. Joseph                         1,064,554.477      5.09%
3427 Gull Road
Nazareth, Michigan  49074


Long-Term U.S. Government Fund
 
Institutional Class
- -------------------
Wendel & Co.                                    883,539.111     41.50%*
P.O. Box 1066
New York, New York  10268
 
Charles Schwab & Co. Inc. **                    372,307.244     17.49%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
The J. Paul Getty Trust                         271,176.111     12.74%
401 Wilshire Blvd., Suite 900
Santa Monica, CA  90401
</TABLE>      

                                      69
<PAGE>
 
<TABLE>    
<CAPTION>
 
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                        <C>               <C>            
Donaldson Lufkin Jenrette                       126,143.139      5.92%
1 Pershing Plaza, 5th Floor
P.O. Box 2052
Jersey City, New Jersey  07303
 
Stussy, Inc.                                    118,340.701      5.56%
1852 Langley Avenue
Irvine, California  92714
 
FTC & Co.                                       117,052.878      5.50%
Attn:  Datalynx
P.O. Box 173736
Denver, Colorado  80217


Foreign Bond Fund
 
Institutional Class
- -------------------
Charles Schwab & Co., Inc.**                  8,102,865.914     44.57%*
The Schwab Building
101 Montgomery Street
San Francisco, CA  94104
 
Donaldson, Lufkin & Jenrette**                4,875,402.044     26.82%*
1 Pershing Plaza
Post Office Box 2052
Jersey City, New Jersey  07399
 
Wachovia Bank & Trust Co., FBO                1,212,759.138      6.67%
Mead Corporation
Post Office Box 3075
Winston-Salem, North Carolina  27150


Global Bond Fund

Institutional Class
- -------------------
Walker Art Center                             2,732,107.200     15.57%
Vineland Place
Minneapolis, Minnesota  55403

Georgetown University                         2,631,718.193     15.00%
3600 M Street, N.W.
Washington, DC  20007
</TABLE>      


                                      70
<PAGE>
 
<TABLE>       
<CAPTION>
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                          <C>             <C>            
Charles Schwab & Co., Inc. **                 1,488,000.066      8.48%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104
 
Brockton Hospital                             1,018,506.673      5.80%
680 Centre Street
Brockton, Massachusetts  02402-3395
 
Pittsburgh Theological Seminary                 977,247.206      5.57%
616 North Highland Avenue
Pittsburgh, Pennsylvania  15206-2596
 
Hudson-Webber Foundation                        924,042.424      5.27%
333 West Fort Street, Suite 1210
Detroit, Michigan  48226
 
Administrative Class
- --------------------
Stocktontrust Nominee Partnership                22,529.977     74.39%*
c/o Stockton Trust, Inc.
3001 East Camelback Road, Suite 100
Phoenix, Arizona  85016
 
FIIOC as Agent for                                7,754.464     25.61%*
Certain Employee Benefits Plan
100 Magetian KW1C
Covington, Kentucky  41015
 
Global Bond Fund II
 
Class A
- -------
Pacific Financial Asset                         406,542.056     56.42%*
Management Corporation
700 Newport Beach Drive
Newport Beach, California  92660

Class B
- -------
Merrill Lynch Pierce Fenner                     144,026.000     48.57%*
& Smith Inc.**
Attn:  Book Entry Department
4800 Deer Lake Drive E., Fl. 3
Jacksonville, Florida  32246-6484
</TABLE>          

                                      71
<PAGE>
 
<TABLE>     
<CAPTION> 
                                               Shares        Percentage of
                                             Beneficially     Outstanding
                                               Owned         Shares Owned
                                               -----         ------------- 
<S>                                          <C>             <C>            
Class C
- -------
Merrill Lynch Pierce Fenner                      16,623.755     20.87%
& Smith Inc.**
Attn:  Book Entry Department
4800 Deer Lake Drive E., Fl. 3
Jacksonville, Florida  32246-6484
 
StocksPLUS Fund
 
Institutional Class
- -------------------
Sisters of St. Benedict                       2,083,703.903     11.99%
c/o Norwest Bank
Sixth & Marquette Avenue
Minneapolis, Minnesota  55479
 
Iowa Methodist                                1,708,223.541     10.24%
1200 Pleasant Street
Des Moines, Iowa  50309
 
Ziff Communications                             986,779.741      5.68%
c/o Bank of New York
One Wall Street, 7th Floor
New York, New York  10286
 
Charles Schwab & Co., Inc. **                   931,337.289      5.36%
The Schwab Building
101 Montgomery Street
San Francisco, California  94104


Strategic Balanced Fund

Institutional Class
- -------------------

Pacific Financial Asset                       1,000,000.000     99.69%*
Management Corporation
700 Newport Center Drive
Newport Beach, California  92660
</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 held only as nominee.
    
       
                                      72
<PAGE>
 
       
     As of June 30, 1997, the Trustees and Officers of the Trust, as a group,
owned less than 1% of the outstanding shares of the Funds.     

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 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") 127 West 10th Street, 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 and Class C shares of the Funds.
Pursuant to a sub-custody agreement between IFTC and The Chase Manhattan Bank,
N.A. ("Chase"), Chase 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, Chase may hold the foreign securities at its principal
office at One Chase Manhattan Plaza, New York, New York 10081, and at Chase'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 

                                      73
<PAGE>
 
institution in its national market; the political and economic stability of the
country in which the institution is located; and further risks of potential
nationali zation 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
       
     Price Waterhouse LLP, 1055 Broadway, Kansas City, MO  64105, serves as
independent public accountants for all Funds.  Price Waterhouse 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.  Prior to October 1, 1996,
Coopers & Lybrand L.L.P. served as independent accountants for the PIMCO Global
Bond Fund II.  See "The Reorganization of the PIMCO Global Bond Fund II" for
additional information.          

Counsel

     Dechert Price & Rhoads, 1500 K Street, N.W., Washington, D.C. 20005, 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.
    
     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, 1997 for its fiscal
year then ended, including notes thereto, and the reports of Price Waterhouse
LLP thereon dated May __, 1997, are incorporated by reference from the Trust's
1997 Annual Report. A copy of the Annual Report delivered with this Statement
of Additional Information should be retained for future reference.     

                                      74
<PAGE>
 
                          PART C.  OTHER INFORMATION
                          --------------------------


Item 24.  Financial Statements and Exhibits
          ---------------------------------
             
     (a)  Financial statements for the Trust as of March 31, 1997, and for its
          fiscal year then ended, including notes thereto, and the reports of
          Price Waterhouse LLP thereon, dated May   , 1997 are incorporated by
          reference from the Annual Report.      

     (b)  Exhibits

      (1) (i)  Declaration of Trust of Registrant/1/
                                                     
         (ii)  Establishment and Designation of Global, Foreign, Low Duration 
               South Africa Free and Total Return South Africa Free Portfolios
               as Series of Registrant/5/

        (iii)  Establishment and Designation of High Yield, Low Duration II
               and Total Return II Portfolios as Series of Registrant/6/
                                                                        
         (iv)  Establishment and Designation of Income and Capital Preservation
               Portfolio I and Income and Capital Preservation Portfolio II as 
               Series of Registrant/7/

          (v)  Amended and Restated Establishment and Designation of Series of 
               Shares of Registrant/8/
                                      
         (vi)  Amended Designation of Two Series of Registrant/8/
                                                                 
        (vii)  Second Amended and Restated Establishment and Designation of
               Series of Shares of Registrant/9/
                                             
       (viii)  Establishment and Designation of Moderate Duration and
               VersaSTYLE Equity Funds as Series of Registrant/10/
                                                              
         (ix)  Amended Designation of Two Series of Registrant/14/
                                                                  
          (x)  Establishment and Designation of StocksPLUS Short Strategy
               Fund as Series of Registrant/15/

         (xi)  Redesignation of One Existing Series and Establishment and 
               Designation of Two New Series of Registrant/16/
            
        (xii)  Form of Redesignation of One Series of Registrant/17/     
                                                                    
<PAGE>
 
     
       (xiii)  Establishment and Designation of One Additional Series of
               Shares and Amended and Restated Establishment and Designation of
               Series of Shares of Registrant/21/      
    
       (xiv)   Amended Designation of Five Existing Series of Registrant/21/

       (xv)    Establishment and Designation of One Additional Series of Shares 
               of Registrant/21/           

       (xvi)   Form  of Establishment and Designation of Four Additional Series 
               of Shares of Registrant/22/

      (2)      By-laws of Registrant/1/
                                       
      (3)      Not applicable

      (4)      Not applicable

      (5) (i)  Investment Advisory Contract/2/
                                              
         (ii)  Supplements to Investment Advisory Contract Relating to Global,
               Foreign, Low Duration South Africa Free and Total Return South 
               Africa Free Portfolios/5/
                                        
        (iii)  Supplements to Investment Advisory Contract Relating to 
               High Yield, Low Duration II and Total Return II Portfolios/6/
                                                                          
         (iv)  Supplements to Investment Advisory Contract Relating to Income 
               and Capital Preservation Portfolio I and Income and Capital 
               Preservation Portfolio II/7/

          (v)  Form of Supplements to Investment Advisory Contract Relating
               to Moderate Duration Fund and VersaSTYLE Equity Fund/10/
                                                                   
         (vi)  Form of Amended Investment Advisory Contract/11/
                                                               
        (vii)  Form of Supplement to Investment Advisory Contract/12/
                                                                     
       (viii)  Form of Supplement to Investment Advisory Contract Relating to
               StocksPLUS Short Strategy Fund/15/
                                              
         (ix)  Supplements to Investment Advisory Contract/16/
    
          (x)  Form of Supplement to Investment Advisory Contract Relating to 
               Global Bond Fund II/21/ 

         (xi)  Form of Supplement to Investment Advisory Contract Relating to 
               Real Return Bond Fund/21/      

        (xii)  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/22/
                               
      (6) (i)  Distribution Contract/2/
                                       
         (ii)  Supplement to Distribution Contract Relating to Global, Foreign,
               Low Duration South Africa Free and Total Return South Africa 
               Free Portfolios/5/
        
                                     - 2 -
<PAGE>
 
        (iii)  Supplement to Distribution Contract Relating to High Yield, Low 
               Duration II and Total Return II Portfolios/6/
                                                            
         (iv)  Supplements to Distribution Contract Relating to Income and 
               Capital Preservation Portfolio I and Income and Capital 
               Preservation Portfolio II/7/
                                           
          (v)  Form of Distribution Contract as Amended May 31, 1994/9/
                                                                       
         (vi)  Form of Supplements to Distribution Contract Relating to
               Moderate Duration Fund and VersaSTYLE Equity Fund/10/
                                                               
        (vii)  Form of Amended Distribution Contract/11/
                                                        
       (viii)  Form of Supplement to Distribution Contract Relating to
               StocksPLUS Short Strategy Fund/15/
                                                 
         (ix)  Supplements to Distribution Contract/16/
                                                               
          (x)  Form of Distribution Contract/18/          
    
         (xi)  Form of Supplement to Distribution Contract Relating to Real
               Return Bond Fund/21/         

        (xii)  Form of Supplement to Distribution Contract Relating to Low 
               Duration Mortgage Fund, Total Return Mortgage Fund, Emerging
               Markets Bond Fund, and Emerging Markets Bond Fund II/22/

      (7)      Not applicable

      (8)      Custodian Agreement/4/
                                     
      (9) (i)  Transfer Agency Agreement/4/
      
         (ii)  Form of Transfer Agency Agreement with Shareholder Services,
               Inc./19/      

     (10) (i)  Opinion of Counsel/13/
                                     
         (ii)  Consent of Counsel/3/
                                       
     (11) (i)  Consent of Price Waterhouse LLP     
    
         (ii)  Consent of Coopers & Lybrand L.L.P.     
                                        
     (12)      Not applicable

     (13)      Not applicable

     (14)      Not applicable

     (15) (i)  Form of Distribution Plan for Administrative Class Shares/9/
                 
         (ii)  Administrative Services Contract/2/
                                                  
        (iii)  Supplements to Administrative Services Contract relating to
               Global, Foreign, Low Duration South Africa Free and Total Return
               South Africa Free Portfolios/5/
               

                                     - 3 -
<PAGE>
 
         (iv)  Supplement to Administrative Services Contract Relating to High 
               Yield, Low Duration II and Total Return II Portfolios/6/
                         
          (v)  Supplements to Administrative Services Contract Relating to
               Income and Capital Preservation Portfolio I and Income and 
               Capital Preservation Portfolio II/7/
                                                   
         (vi)  Form of Administrative Services Plan for Administrative Class 
               Shares/9/

        (vii)  Form of Supplements to Administrative Services Contract Relating
               to Moderate Duration Fund and VersaSTYLE Equity Fund/10/
                  
       (viii)  Form of Amended Administrative Services Contract/11/
                                                                   
         (ix)  Form of Amended Administrative Services Contract/12/
                                                                   
          (x)  Form of Supplement to Administration Agreement Relating to
               StocksPLUS Short Strategy Fund/16/
                                              
         (xi)  Supplements to Administration Agreement/16/

        (xii)  Form of Amendment to Administration Agreement/18/     
                                                                  
       (xiii)  Form of Amendment to Administration Agreement/21/      
    
        (xiv)  Form of Administration Agreement between PIMCO Advisors L.P. and 
               Pacific Investment Management Company /20/     

         (xv)  Form of Supplement to Administration Agreement Relating to Low 
               Duration Mortgage Fund, Total Return Mortgage Fund, Emerging
               Markets Bond Fund, and Emerging Markets Bond Fund II/22/
                                                                    
        (xvi)  Form of Distribution and Servicing Plan for Class A 
               shares/18/     
                                           
       (xvii)  Form of Distribution and Servicing Plan for Class B 
               shares/18/     
    
      (xviii)  Form of Distribution and Servicing Plan for Class C 
               shares/18/     
     
     (16)      Calculation of Performance/12/
                                         
     (17)      Financial Data Schedule/22/
 
     (18) (i)  Dual-Class Plan/12/

         (ii)  Amended Dual-Class Plan/16/
                                                  
        (iii)  Amended and Restated Multi-Class Plan adopted pursuant to 
               Rule 18f-3/18/          
             
                                     - 4 -
<PAGE>
 
/1/   Filed with initial Registration Statement on February 19, 1987
      (File No. 33-12113).

/2/   Filed with Pre-Effective Amendment No. 2 on April 21, 1987.

/3/   Filed with Pre-Effective Amendment No. 4 on May 5, 1987.

/4/   Filed with Post-Effective Amendment No. 3 on August 1, 1988.

/5/   Filed with Post-Effective Amendment No. 8 on August 3, 1990.

/6/   Filed with Post-Effective Amendment No. 10 on May 31, 1991.

/7/   Filed with Post-Effective Amendment No. 12 on August 29, 1991.

/8/   Filed with Post-Effective Amendment No. 15 on June 1, 1992.

/9/   Filed with Post-Effective Amendment No. 20 on June 1, 1994.

/10/  Filed with Post-Effective Amendment No. 21 on August 1, 1994.

/11/  Filed with Post-Effective Amendment No. 22 on November 30, 1994.

/12/  Filed with Post-Effective Amendment No. 23 on June 1, 1995.

/13/  Filed with Registrant's Rule 24f-2 Notice.

/14/  Filed with Post-Effective Amendment No. 24 on July 31, 1995.

/15/  Filed with Post-Effective Amendment No. 27 on January 16, 1996.

/16/  Filed with Post-Effective Amendment No. 28 on April 1, 1996.
        
/17/  Filed with Post-Effective Amendment No. 29 on June 14, 1996.     
    
/18/  Filed with Registration Statement on Form N-14 (File No. 333-12871) on
      September 27, 1996.     
    
/19/  Filed with Post Effective Amendment No. 33 to the Registration Statement
      of PIMCO Advisors Funds (File No. 2-87203) on November 30, 1995.    

/20/  Filed with Post Effective Amendment No. 25 to the Registration Statement
      of PIMCO Funds: Equity Advisors Series (File No. 33-36528) on January 13,
      1997.

/21/  Filed with Post Effective Amendment No. 33 on January 13, 1997.

/22/  To be filed in a subsequent post-effective amendment prior to the 
      effective date of this amendment.

                                      - 5 -
<PAGE>
 
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 March 31, 1997, the number of record holders of each Fund and
          Class thereof of the Registrant were as follows:      
<TABLE>        
<CAPTION>
                                                     Class
                                                     -----

                                  Institutional  Administrative A    B    C
                                  -------------  -------------- -    -    -
     Fund
     ----
     <S>                          <C>            <C>            <C>      <C>       <C>          
     Money Market                     199                1      708       126       5,224       
     Short-Term                       122                3       19        13          44       
     Low Duration                     550               11      302       314       3,445       
     Low Duration II                   47                0        0         0           0           
     Low Duration III                   2                0        0         0           0           
     Moderate Duration                  3                0        0         0           0           
     High Yield                        89                7    1,070     2,759      15,347       
     Total Return                   1,261               52    2,576     3,661      21,253       
     Total Return II                  185                8        0         0           0           
     Total Return III                  25                0        0         0           0           
     Commercial Mortgage                                                                        
      Securities                        0                0        0         0           0           
     Long-Term U.S. Government         20                0       19        19          19       
     Real Return Bond                   5                0        1        13           9           
     Foreign Bond                      56                0       35        61         102              
     Global Bond                       48                3        0         0           0           
     Global Bond II                     0                0      291       257         384           
     International Bond               115                0        0         0           0       
     StocksPLUS                        66                3      254       525         649       
     StocksPLUS Short Strategy          0                0        0         0           0       
     Strategic Balanced                 5                0        0         0           0        
</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,

                                     - 6 -
<PAGE>
 
          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
          ----------------------------------------------------

          PIMCO, the investment adviser to the Trust, is a subsidiary
          partnership of PIMCO Advisors L.P. ("PIMCO Advisors").  The general
          partner of PIMCO Advisors is PIMCO Partners, G.P., a general
          partnership between Pacific Investment Management Company, an indirect
          wholly-owned subsidiary of Pacific Mutual Life Insurance Company
          ("Pacific Mutual"), and PIMCO Partners LLC, a limited liability
          company controlled by the PIMCO Managing Directors.

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


Name                       Business and Other Connections
- ----                       ------------------------------
Allan, George C.           Vice President, PIMCO and PIMCO Management, Inc.
 
Arnold, Tamara J.          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.
                           
Brynjolfsson, John B.      Vice President, PIMCO and PIMCO Management, Inc.

                                     - 7 -
<PAGE>
 
Name                       Business and Other Connections
- ----                       ------------------------------
        
Burns, R. Wesley           Executive Vice President, PIMCO and PIMCO
                           Management, Inc.; President of the Trust and PIMCO
                           Commercial Mortgage Securities Trust, Inc.; Executive
                           Vice President, PIMCO Funds: Multi-Manager Series;
                           Vice President, Cash Accumulation Trust.    
                                           
Cupps, Wendy W.            Vice President, PIMCO and PIMCO Management, Inc.
 
Daniels, Charles M. III    Executive Vice President, PIMCO and PIMCO
                           Management, Inc. 

Dow, Michael               Vice President, PIMCO and PIMCO Management, Inc.
 
Dunn, Anita                Vice President, PIMCO and PIMCO Management, Inc.
                                   
Edington, David H.         Managing Director, PIMCO; Director and Managing
                           Director, PIMCO Management, Inc.; Director: Stocks
                           Plus Management, Inc.; Member of PIMCO Partners
                           LLC.    
                                
Ehlert, A. Benjamin        Executive Vice President, PIMCO and PIMCO 
                           Management, Inc.                
 
Ettl, Robert A.            Vice President, PIMCO and PIMCO Management, Inc.
                                   
Faillace, Anthony L.       Vice President, PIMCO and PIMCO Management, Inc.

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., and StocksPLUS Management Inc.;
                           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; PIMCO Funds Distribution
                           Company.
    
Frisch, Ursula T.          Vice President, PIMCO     
                                   
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; Member of Equity and 
                           Operating Boards, 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.        Senior Vice President, PIMCO and PIMCO Management,
                           Inc.
 

                                    - 8 - 
<PAGE>
 
Name                       Business and Other Connections
- ----                       ------------------------------
                                    
Hardaway, John P.          Vice President, PIMCO and PIMCO Management, Inc.;
                           Treasurer of the Trust, PIMCO Funds: Multi-Manager
                           Series; PIMCO Commercial Mortgage Securities Trust,
                           Inc., and Cash Accumulation Trust.     
                                   
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 Operating Board,
                           PIMCO Advisors; Member of PIMCO Partners LLC.     

Hattesohl, Joseph D.       Vice President, PIMCO and PIMCO Management, Inc.

Hayes, Raymond C.          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.
                                    
Keller, James M.           Vice President, PIMCO and PIMCO Management, Inc.

Kociuba, James             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.
                                   
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 Operating Board, PIMCO
                           Advisors; Member of PIMCO Partners, LLC.     
                                   
Muzzy, James F.            Managing Director, PIMCO; Director and Managing
                           Director, PIMCO Management, Inc.; Director and Vice
                           President, StocksPLUS Management, Inc.; Vice
                           President of the Trust; Member of Operating Board,
                           PIMCO Advisors; Member of PIMCO Partners LLC.     
                                   
Ongaro, Douglas J.         Vice President, PIMCO and PIMCO Management, Inc.

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

                                     - 9 -
<PAGE>
 
Name                       Business and Other Connections
- ----                       ------------------------------
                               
Podlich, William F. III    Managing Director, PIMCO; Director and Managing
                           Director, PIMCO Management, Inc.; Vice President,
                           PIMCO Commercial Mortgage Securities Trust, Inc.,
                           Member of Equity and Operating Boards, 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.     
                                   
Rabinovitch, Frank B.      Managing Director, PIMCO; Director and Managing
                           Director, PIMCO Management, Inc.; Member of PIMCO
                           Partners LLC.          

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

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

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

Sargent, Jeffrey M.        Vice President, PIMCO, PIMCO Management, Inc., the
                           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 and Assistant Secretary, Assistant
                           Treasurer, StocksPLUS Management, Inc.

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

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

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

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

                                    - 10 -
<PAGE>
 
Name                       Business and Other Connections
- ----                       ------------------------------
                                   
Thompson, William S.       Chief Executive Officer and Managing Director, PIMCO;
  Jr.                      Director, Managing Director and Chief Executive
                           Officer, PIMCO Management, Inc.; Director and
                           President, StocksPLUS Management, Inc.; Vice
                           President of the Trust and PIMCO Commercial Mortgage
                           Securities Trust, Inc.; Member of Equity Board and
                           Operating Committee, and Member of Operating Board,
                           PIMCO Advisors; Member 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 Operating Board, PIMCO
                           Advisors; Member of PIMCO Partners LLC.
                                   
Wagner, Teresa A.          Vice President, PIMCO, PIMCO Management, Inc., the
                           Trust, PIMCO Commercial Mortgage Securities Trust,
                           Inc. and PIMCO Funds: Multi-Manager Series; Vice
                           President and Assistant Clerk, Cash Accumulation 
                           Trust.     

Ward, Andrew C.            Vice President, PIMCO and PIMCO Management, Inc.;
                           Senior Vice President of the Trust.
        
Weil, Richard M.           Assistant Secretary, PIMCO; Senior Vice President,
                           PIMCO Management, Inc., Columbus Circle Investors,
                           Columbus Circle Investors Management, Inc., Cadence
                           Capital Management, Cadence Capital Management, Inc.,
                           and PIMCO Funds Distribution Company; Secretary, NFJ
                           Management, Inc., Parametric Management, Inc., NFJ
                           Investment Group, Parametric Portfolio Associates,
                           and StocksPLUS Management, Inc.; Vice President,
                           PIMCO Funds: Multi-Manager Series.

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

Willner, Ram               Vice President, PIMCO and PIMCO Management, Inc.
        
Wilsey, Kristen M.         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.
 

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 Distribution Company is 2187 Atlantic Street,
Stamford, CT 06902.     

                                    - 11 -
<PAGE>
 
Item 29.  Principal Underwriters
          ----------------------
   
          (a)  PIMCO Funds Distribution Company (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
                                                                     
Cvengros, William D.            Director                          None
                                    
Fitzgerald, Robert M.           Senior Vice President, 
                                Chief Financial Officer and       None
                                Controller
                                                                     
Gallagher, Michael J.           Vice President                    None
 
Goldsmith, David S.             Vice President

Gray, Ronald H.                 Vice President                    None
                                                                          
Hussex, John B.                 Vice President    

Janeczek, Edward W.             Senior Vice President             None 
 
Jones, Jonathan C.              Vice President    

Lynch, William E.               Senior Vice President             None      
 
McCarthy, Jacqueline A.         Vice President                    None
 
Meyers, Andrew J.               Executive Vice President          None
        
Moyer, Fiora H.                 Regional Vice President           None     
    
Neugebauer, Phil J.             Vice President                    None      
                                                                         
Pearlman, Joffrey H.            Regional Vice President           None      
</TABLE> 

                                    - 12 -
<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
                                                                     
Russell, Matthew M.             Vice President                    None
                                    
Schott, Newton B., Jr.          Director, Executive Vice          None
                                President/Secretary, Chief 
                                Administrative/Legal Officer 
                                and Secretary
 
Smith, Robert H.                Vice President    

Stone, David P.                 Regional Vice President           None
                                       
Thomas, William H., Jr.         Regional Vice President           None
 
Treadway, Stephen J.            Director, Chairman,               None
                                President and Chief
                                Executive Officer
                                    
Troyer, Paul H.                 Senior Vice President             None
                                     
Trumbore, Brian F.              Executive Vice President          None
    
Uecker, Timothy G.              Vice President    

Weil, Richard M.                Assistant Secretary               None     

Zimmerman, Glen A.              Vice President    
- -------------
</TABLE>      
*  The business address of all directors and 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, 127 West 10th Street, Kansas City,
               Missouri 64105, and Shareholder Services, Inc., P.O. Box 5866
               Denver, Colorado 80217.


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

               Not applicable


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

               (a)  Not applicable.

                                    - 13 -
<PAGE>
 
               (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.






                                    - 14 -
<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 this Registration Statement pursuant to
Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-
Effective Amendment No. 35 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 1st day of May, 1997.     

                                  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:
 
<TABLE>         
<CAPTION> 
Signature                            Title           Date

<S>                                  <C>             <C>  
- --------------------------           Trustee         May 1, 1997    
Guilford C. Babcock*+                            
                                                 
- --------------------------           Trustee         May 1, 1997    
Thomas P. Kemp*+                                 
                                                 
- --------------------------           Trustee         May 1, 1997    
Brent R. Harris*+++                              
                                                 
- --------------------------           Trustee         May 1, 1997    
William J. Popejoy* +++++                        
                                                 
- --------------------------           Trustee         May 1, 1997    
Vern O. Curtis*++++++                            
                                                 
- --------------------------           President       May 1, 1997    
R. Wesley Burns*++++                 (Principal     
                                     Executive      
                                     Officer)       
                                                 
- --------------------------           Treasurer       May 1, 1997    
John P. Hardaway++*                  (Principal     
                                     Financial
                                     and Accounting
                                     Officer)
</TABLE>           
        
*By: /s/ Robert W. Helm
    -------------------
    Robert W. Helm,
    as attorney-in-fact          
<PAGE>
 
     -------------------                     
     +       Pursuant to power of attorney filed with Post-Effective Amendment
             No. 1 to Registration Statement No. 33-12113 on November 6, 1987.
     ++      Pursuant to power of attorney filed with Post-Effective Amendment
             No. 10 to Registration Statement No. 33-12113 on May 31, 1991.
     +++     Pursuant to power of attorney filed with Post-Effective Amendment
             No. 14 to Registration Statement No. 33-12113 on April 28, 1992.
     ++++    Pursuant to power of attorney filed with Post-Effective Amendment
             No. 20 to Registration Statement No. 33-12113 on June 1, 1995.
     +++++   Pursuant to power of attorney filed with Post-Effective Amendment
             No. 22 to Registration Statement No. 33-12113 on November 30, 1994.
     ++++++  Pursuant to power of attorney filed with Post-Effective Amendment
             No. 23 to Registration Statement No. 33-12113 on June 1, 1995.



<PAGE>
 
                                  PIMCO Funds
   
                               INDEX TO EXHIBITS
                                   FILED WITH
                        POST-EFFECTIVE AMENDMENT NO. 35

 
EXHIBIT 11(i)         Consent of Price Waterhouse LLP. (EDGAR EXHIBIT
                      99.B11(i)).     
    
EXHIBIT 11(ii)        Consent of Coopers & Lybrand L.L.P. (EDGAR EXHIBIT
                      99.B11(ii)).     
   


<PAGE>
 
                      Consent of Independent Accountants

We hereby consent to the references to us in the Institutional Prospectus,
Retail Prospectus and the Statement of Additional Information constituting parts
of this Post-Effective Amendment No. 35 to the registration statement on Form  
N-1A (the "Registration Statement") of the PIMCO Funds: Pacific Investment
Management Series as "Independent Accountants" and "Financial Statements" in the
Statement of Additional Information.


    
/s/Price Waterhouse LLP      
Price Waterhouse LLP


    
Kansas City, Missouri 
April 30, 1997       


<PAGE>
 
We consent to the incorporation by reference in this Post-Effective Amendment 
No. 35 to the Registration Statement of PIMCO Funds on Form N-1A (File No. 
33-12113) (the "Registration Statement") of our report dated November 22, 1996
on our audit of the financial statements and financial highlights of PIMCO
Advisors Funds which is included in the Annual Report of PIMCO Advisors Funds
for the year ended September 30, 1996; which is also incorporated by reference
in the Registration Statement.

We also consent to the reference to our Firm in the Statement of Additional
Information under the caption "Independent Accountants".





                                             
                                          /s/Coopers & Lybrand L.L.P.
                                             COOPERS & LYBRAND L.L.P.      


New York, New York

April 30, 1997




© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission