INSTITUTIONAL SERIES TRUST
485APOS, 1995-03-29
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<PAGE>
   

    AS  FILED WITH THE  SECURITIES AND EXCHANGE COMMISSION ON MARCH 29, 1995
                                               SECURITIES ACT FILE NO. 33-70362
                                       INVESTMENT COMPANY ACT FILE NO. 811-8080
    
________________________________________________________________________________
________________________________________________________________________________
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                   FORM N-1A
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933          [x]
                          PRE-EFFECTIVE AMENDMENT NO.                        [ ]
                         POST-EFFECTIVE AMENDMENT NO. 2                      [x]
                                     AND/OR
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940      [x]
                                AMENDMENT NO. 3                              [x]
    
                        (CHECK APPROPRIATE BOX OR BOXES)
 
                            ------------------------
 
                           INSTITUTIONAL SERIES TRUST
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
   
<TABLE>
<S>                                                                   <C>
                     1285 AVENUE OF THE AMERICAS
                         NEW YORK, NEW YORK                           10019
              (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)              (ZIP CODE)
</TABLE>
    
 
   
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (212) 713-2000
    
 
   
                              DIANNE E. O'DONNELL
                    MITCHELL HUTCHINS ASSET MANAGEMENT INC.
                          1285 AVENUE OF THE AMERICAS
                            NEW YORK, NEW YORK 10019
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
    
 
                                   COPIES TO:
                               JON S. RAND, ESQ.
                            WILLKIE FARR & GALLAGHER
                              ONE CITICORP CENTER
                              153 EAST 53RD STREET
                         NEW YORK, NEW YORK 10022-4669
 
                            ------------------------
 

   
IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
    
   
             [ ] IMMEDIATELY UPON FILING PURSUANT TO PARAGRAPH (b) OF RULE 485
    
   
             [ ] ON (DATE) PURSUANT TO PARAGRAPH (b) OF RULE 485
    
   
             [x] 60 DAYS AFTER FILING PURSUANT TO PARAGRAPH (a)(1) OF RULE 485
    
   
             [ ] ON (DATE) PURSUANT TO PARAGRAPH (a)(1) OF RULE 485
    
   
             [ ] 75 DAYS AFTER FILING PURSUANT TO PARAGRAPH (a)(2) OF RULE 485
    
   
             [ ] ON (DATE) PURSUANT TO PARAGRAPH (a)(2) OF RULE 485
    
 
   
     IF APPROPRIATE, CHECK THE FOLLOWING BOX:
    
   
                   [ ] THIS POST-EFFECTIVE AMENDMENT DESIGNATES A NEW  EFFECTIVE
                       DATE FOR A PREVIOUSLY FILED POST-EFFECTIVE AMENDMENT.
    
 
   
     THE  REGISTRANT HAS REGISTERED AN INDEFINITE NUMBER OF ITS SHARES UNDER THE
SECURITIES ACT OF 1933 PURSUANT TO  RULE 24f-2 UNDER THE INVESTMENT COMPANY  ACT
OF  1940, AS  AMENDED. THE  NOTICE REQUIRED  BY SUCH  RULE FOR  THE REGISTRANT'S
FISCAL YEAR ENDED NOVEMBER 30, 1994 WAS FILED ON OR ABOUT JANUARY 27, 1995.
    
 
________________________________________________________________________________
________________________________________________________________________________
<PAGE>
   
Prospectus                                                        March 28, 1995
--------------------------------------------------------------------------------
    
 
               INSTITUTIONAL ADJUSTABLE RATE GOVERNMENT PORTFOLIO
                              INSTITUTIONAL SHARES
 
   
    1285 AVENUE OF THE AMERICAS   NEW YORK, NEW YORK 10019   (800) 543-3373
    
 
   
Institutional  Adjustable Rate  Government Portfolio  (the 'Fund'),  a series of
Institutional Series Trust (the 'Trust'),  seeks to provide high current  income
while  limiting the degree of fluctuation of  its net asset value resulting from
movements in  interest  rates. The  Fund  seeks  to achieve  this  objective  by
investing   primarily   in   adjustable   rate   securities   ('Adjustable  Rate
Securities'). The Fund invests only in securities that are issued or  guaranteed
by   the  U.S.  Government,  its   agencies  or  instrumentalities  ('Government
Securities'). Although the Fund's  portfolio may be  expected to experience  low
volatility  due to the unique characteristics of Adjustable Rate Securities, the
Fund is not a money market fund  that attempts to maintain a constant net  asset
value  and the Fund's investment portfolio can be expected to experience greater
volatility than that of a money market fund.
    
 
Institutional shares of  the Fund  are available for  purchase by  institutional
investors  without imposition of any sales  charge, deferred sales charge or any
other transaction  fee. These  institutional investors  include  municipalities,
national   banks,   federal   savings  institutions,   federal   credit  unions,
corporations,  trust  companies,  investment  bankers  and  brokers,   insurance
companies,  investment counsellors,  pension funds, employee  benefit plans, law
firms, trusts, estates and educational, religious and charitable  organizations.
The Fund intends to limit its investments to those that would be permissible for
national banks, federal savings institutions and federal credit unions.
 
This Prospectus briefly sets forth certain information about the Fund, including
applicable  operating expenses,  that prospective  investors should  know before
investing. Investors  are advised  to read  this Prospectus  and retain  it  for
future reference.
 
Additional  information about the  Fund, contained in  a Statement of Additional
Information dated the  same date  as this Prospectus,  has been  filed with  the
Securities  and Exchange  Commission (the 'SEC')  and is  available to investors
upon request and without charge by calling or writing the Trust at the telephone
number or  address listed  above.  The Statement  of Additional  Information  is
incorporated in its entirety by reference into this Prospectus.
 
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.
<PAGE>
--------------------------------------------------------------------------------
 
                                   FEE TABLE
 
The  table below  shows the  costs and  expenses that  an investor  would incur,
either directly or indirectly, as a holder of Institutional shares of the  Fund,
based  upon an estimate  of the Fund's projected  annual operating expenses. See
'Purchase and Redemption  of Shares'  and 'General Information.'  Shares of  the
Fund  are sold without imposition of any  sales charge, deferred sales charge or
any other transaction fee.
 
<TABLE>
<CAPTION>
ANNUAL FUND OPERATING EXPENSES                                                               INSTITUTIONAL
(AS A PERCENTAGE OF AVERAGE NET ASSETS)*                                                        SHARES
------------------------------------------------------------------------------------------   -------------
<S>                                                                                          <C>
Management Fee............................................................................         .45%
Total Other Expenses (after reimbursements)*..............................................         .10%
                                                                                                ------
     Total Operating Expenses (after reimbursements)*.....................................         .55%
</TABLE>
 
   
     The nature of the services provided  to, and the aggregate management  fees
paid  by, the Fund are described below  under 'Management of the Fund.' Expenses
associated with  distributing  the  Fund's  shares  are  borne  by  the  Trust's
distributor out of its own resources and are not borne directly or indirectly by
shareholders.  For more complete descriptions of the various costs and expenses,
see 'Management of the  Fund.' The percentage of  'Other Expenses' in the  table
above  has been restated and is based on amounts expected to be incurred for the
current fiscal  year;  these expenses  include  fees for  shareholder  services,
custodial fees, legal and accounting fees, printing costs and registration fees,
the  costs  of regulatory  compliance, a  portion of  the costs  associated with
maintaining the Trust's legal existence and the costs involved in  communicating
with the Fund's shareholders.
    
 
     The  following example  demonstrates the  projected dollar  amount of total
cumulative expenses that would be incurred over various periods with respect  to
a  hypothetical $1,000 investment  in Institutional shares  of the Fund assuming
(1) a 5% annual return, (2) payment of annual total operating expenses set forth
in the table above and (3) complete redemption at the end of the period.
 
   
<TABLE>
<CAPTION>
EXAMPLE*                                                            1 YEAR    3 YEARS    5 YEARS    10 YEARS
-----------------------------------------------------------------   ------    -------    -------    --------
<S>                                                                 <C>       <C>        <C>        <C>
Institutional shares.............................................     $6        $18        $31        $ 69
</TABLE>
    
 
   
     *The expense table and  the example reflect an  undertaking by the  Trust's
investment  adviser and administrator to reduce  or otherwise limit the expenses
of the Fund, on  an annualized basis,  to .55% of the  Fund's average daily  net
assets  in respect of Institutional shares.  In the absence of this undertaking,
which may be terminated at any time, 'Total Other Expenses' and 'Total Operating
Expenses' would be .24% and .69%, respectively. See 'Management of the Fund.'
    
 
     The above  example  is intended  to  assist an  investor  in  understanding
various  costs  and  expenses  that  the investor  would  bear  upon  becoming a
shareholder of  the  Fund.  The  example  should  not  be  considered  to  be  a
representation  of past or future  expenses. Actual expenses of  the Fund may be
greater or less than those  shown above. The assumed  5% annual return shown  in
the  example is hypothetical and should not be considered to be a representation
of past or future annual return; the actual return of the Fund may be greater or
less than the assumed return.
 
                                       2
<PAGE>
--------------------------------------------------------------------------------
 
                                   HIGHLIGHTS
 
<TABLE>
<S>              <C>        <C>
------------------------------------------------------------------------------------------------------------------
-------------------
The Trust
                            The Trust is an open-end management investment company. See 'General Information.'
------------------------------------------------------------------------------------------------------------------
-------------------
The Fund
                            The  Fund, the initial series  of the Trust, is  a diversified fund that  seeks to provide high
                            current income while limiting the degree of  fluctuation of its net asset value resulting  from
                            movements in interest rates. See 'Investment Objective and Policies' and 'General Information.'
------------------------------------------------------------------------------------------------------------------
-------------------
Benefits of
Investing
in the
Fund
                            Mutual  funds,  such  as  the  Fund,  are  flexible  investment  tools  that  are  increasingly
                            popular -- one of four American households now owns  shares of at least one mutual fund --  for
                            very sound reasons. The Fund offers investors the following important benefits:
 
                            Fund Designed For Institutions
                             Institutional shares of the Fund are designed primarily for institutions as an  economical and
                             convenient  means for the investment of short term  funds that they hold for their own account
                             or invest  for others.  These  institutions include  municipalities, national  banks,  federal
                             savings institutions, federal credit unions, corporations, trust companies, investment bankers
                             and  brokers,  insurance companies,  investment counsellors,  pension funds,  employee benefit
                             plans, law firms, trusts, estates and educational, religious and charitable organizations. See
                             'Purchase and Redemption of Shares.'
 
                            Permissible Investment for Certain Depository Institutions
                             The Fund intends to  limit its investments  to those that would  be permissible  for  national
                             banks, federal savings institutions and federal credit unions.
 
                            Attractive Investment Alternative
                             The  Fund is  designed for investors who desire (1) a higher yield than is generally available
                             from traditional fixed income investments that seek to maintain stable principal values,  such
                             as  bank money market deposit accounts, money  market mutual funds or certificates of deposit,
                             (2) less fluctuation in net asset value than longer term fixed income funds and (3) the credit
                             safety of  a  portfolio comprised  of  Government Securities.  During  a period  of  declining
                             interest rates, however, the Fund's total return may be lower than that of a fund investing in
                             fixed  rate longer term instruments  such as U.S. Treasury bonds.  In addition, the Fund's net
                             asset value can be expected  to experience greater volatility than  the value of a bank  money
                             market  deposit account, money market  mutual fund or certificate  of deposit. See 'Investment
                             Objective and Policies.'
</TABLE>
 
                                       3
 
<PAGE>
--------------------------------------------------------------------------------
   
<TABLE>
<S>              <C>        <C>
                            Adjustable Rate Securities
                             The Fund invests at least 65% of its total assets in Adjustable Rate Securities, all of  which
                             are  also  Government Securities.  Unlike fixed  rate  securities, Adjustable  Rate Securities
                             adjust their rate  of interest to  general market  interest rate conditions,  subject in  some
                             instances  to certain limitations typically referred to  as 'caps' and 'floors.' Because their
                             rates of interest adjust at regular intervals,  Adjustable Rate Securities can be expected  to
                             experience  less volatility of principal than is generally inherent in securities with similar
                             or longer terms that have fixed rates of interest.
 
                            High Quality Securities
                             The Fund  also invests  100% of its assets  in Government Securities, many  of which are  also
                             Adjustable Rate Securities.
 
                            Professional Management
                             By pooling  the monies of many investors, the Fund enables shareholders to obtain the benefits
                             of  full-time professional management and an array of investments that is typically beyond the
                             means of most investors. The Fund's investment adviser reviews the fundamental characteristics
                             of far  more securities  than  can a  typical investor  and  may employ  portfolio  management
                             techniques  that frequently  are not used  by many institutional  investors. Additionally, the
                             larger denominations in which  the Fund invests  may result in better  overall prices for  the
                             investment. See 'Management of the Fund.'
 
                            Transaction Savings
                             By  investing  in  the  Fund, an  investor  is able  to acquire  ownership  in a  portfolio of
                             securities without paying the higher transaction  costs generally associated with a series  of
                             small securities purchases.
 
                            Convenience
                             Fund  shareholders  are  relieved  of the  administrative  and recordkeeping  burdens normally
                             associated with direct ownership of securities. See 'Purchase and Redemption of Shares.'
 
                            Liquidity
                             The Fund's  convenient  purchase  and redemption  procedures provide  shareholders with  ready
                             access  to their money  and reduce the delays  frequently involved in  the direct purchase and
                             sale of securities. See 'Purchase and Redemption of Shares.'
 
                            Exchange Privilege
                             Holders  of  Institutional  shares   may  exchange  all or  a  portion  of  their  shares  for
                             Institutional shares of any of the investment portfolios of Liquid Institutional Reserves. See
                             'Purchase and Redemption of Shares -- Exchanges.'
</TABLE>
    
 
                                       4
 
<PAGE>
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<TABLE>
<S>              <C>        <C>
-------------------
Purchase
and
Redemption
of Shares
                            The  minimum initial investment in  the Fund is $250,000 and  there is no subsequent investment
                            minimum. An  initial  purchase  of  Institutional  shares  must  be  made  through  PaineWebber
                            Incorporated  ('PaineWebber')  and its  correspondent firms  for investors  who are  clients of
                            PaineWebber or those firms ('PaineWebber clients') and, for other investors, through PFPC Inc.,
                            the Fund's transfer agent ('Transfer Agent'). See 'Purchase and Redemption of Shares.'
------------------------------------------------------------------------------------------------------------------
-------------------
Management
Services
                            Mitchell Hutchins Asset  Management Inc. ('Mitchell  Hutchins'), a wholly  owned subsidiary  of
                            PaineWebber,  serves as investment  adviser and administrator  of the Fund  and receives a fee,
                            accrued daily and paid  monthly, at the  annual rate of  .45% of the  Fund's average daily  net
                            assets. Mitchell Hutchins has undertaken to maintain the Fund's total annual operating expenses
                            at a level not exceeding .55% of the Fund's average daily net assets annually for Institutional
                            shares. This undertaking may be terminated at any time. See 'Management of the Fund.'
------------------------------------------------------------------------------------------------------------------
-------------------
Distributor
                            Mitchell Hutchins serves as the distributor of the Fund's shares.
------------------------------------------------------------------------------------------------------------------
-------------------
Dividends
                            Substantially  all of  the Fund's  net investment  income is  declared daily  as of  4:00 p.m.,
                            Eastern  time,  as  a  dividend  and  distributed  to  shareholders  monthly.  See  'Dividends,
                            Distributions and Taxes.'
------------------------------------------------------------------------------------------------------------------
-------------------
Risk Factors
and Special
Considera-
tions
                            No  assurance can  be given  that the Fund  will achieve  its investment  objective. Changes in
                            interest rates generally  will result  in increases  or decreases in  the market  value of  the
                            obligations  held by the  Fund and, unlike  that of a  money market fund,  the Fund's net asset
                            value per share will fluctuate. Certain of the instruments held by the Fund, and certain of the
                            investment techniques that the Fund may employ, might expose the Fund to certain risks, such as
                            mortgage-backed securities  ('MBS')  (which include  adjustable  rate mortgage  securities  and
                            collateralized  mortgage obligations).  MBS are  subject to  prepayment or  early payout risks,
                            which are affected by changes in  prevailing interest rates and numerous economic,  geographic,
                            social  and other factors. The Fund's reverse  repurchase agreement transactions involve a form
                            of leverage.  The  other investment  techniques  presenting the  Fund  with risks  are  lending
                            portfolio securities, entering into repurchase agreement transactions and purchasing securities
                            on  a when-issued  or delayed delivery  basis. See  'Investment Objective and  Policies -- Risk
                            Factors and Special Considerations' at page 12.
</TABLE>
    
 
                                       5
<PAGE>
--------------------------------------------------------------------------------
 
                              FINANCIAL HIGHLIGHTS
 
   
The  financial  information  for  Institutional  shares  of  the  Fund  has been
presented in the table below for the period from March 24, 1994 (commencement of
operations) through November 30, 1994.  This information is supplemented by  the
financial  statements  and accompanying  notes  appearing in  the  Fund's Annual
Report to Shareholders for  the fiscal year ended  November 30, 1994, which  are
incorporated  by  reference into  the Statement  of Additional  Information. The
financial statements  and  notes,  as  well as  the  information  in  the  table
appearing  below,  have  been  audited by  Deloitte  &  Touche  LLP, independent
auditors, whose report thereon is included in the Annual Report to Shareholders.
Further information about the  performance of the Fund  is also included in  the
Annual Report to Shareholders, which may be obtained without charge.
    
 
   
<TABLE>
<CAPTION>
                                                                                                  MARCH 24, 1994* TO
                                                                                                   NOVEMBER 30, 1994
                                                                                                 ---------------------
 
<S>                                                                                              <C>
Net asset value, beginning of period..........................................................          $ 12.00
                                                                                                     ----------
INCOME FROM INVESTMENT OPERATIONS
Net investment income.........................................................................             0.39
Net realized and unrealized losses on investments.............................................           (0.19)
                                                                                                     ----------
Total from investment operations..............................................................             0.20
                                                                                                     ----------
DISTRIBUTIONS TO SHAREHOLDERS FROM
Net investment income.........................................................................           (0.39)
                                                                                                     ----------
Net asset value, end of period................................................................          $ 11.81
                                                                                                     ----------
                                                                                                     ----------
Total return (Annualized)#....................................................................             2.39%
RATIOS/SUPPLEMENTAL DATA
Net assets, end of period (in thousands)......................................................          $52,018
RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
Expenses, net of reimbursement................................................................             0.46%
Expenses, before reimbursement from manager...................................................             0.69%
Net investment income.........................................................................             4.75%
PORTFOLIO TURNOVER RATE.......................................................................           170.25%
</TABLE>
    

* Commencement of Operations.
# Total return is calculated by giving effect to the reinvestment of dividends
  on the dividend payment date.
 
                                       6
 
<PAGE>
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                       INVESTMENT OBJECTIVE AND POLICIES
 
INVESTMENT OBJECTIVE
 
The Fund's investment objective is to provide high current income while limiting
the  degree of fluctuation  of its net  asset value resulting  from movements in
interest rates. No assurance can be given that the Fund will be able to  achieve
its  investment objective,  which may  be changed  only with  the approval  of a
majority of the Fund's  outstanding voting securities, which  is defined in  the
Investment  Company Act of 1940,  as amended (the '1940  Act'), as the lesser of
(1) 67% or more of the shares present at a Fund meeting, if the holders of  more
than  50% of the  outstanding shares of  the Fund are  present or represented by
proxy or (2) more than 50% of the outstanding shares of the Fund.
 
TYPES OF PORTFOLIO INVESTMENTS
 
   
The Fund invests exclusively in  Government Securities and, under normal  market
conditions,  invests  at  least  65%  of its  total  assets  in  Adjustable Rate
Securities. The Fund may invest up to  35% of its net assets in securities  that
are  not  Adjustable Rate  Securities. The  Fund  may not  invest its  assets in
securities subject to legal or contractual restrictions on resale and securities
for which  no readily  available  market exists  or other  illiquid  securities,
including repurchase agreements having maturities of more than seven days.
    
 
   
     The Fund seeks to achieve low volatility of net asset value by investing in
a  diversified portfolio of  securities that Mitchell  Hutchins believes, in the
aggregate,  is  resistant  to  significant  fluctuations  in  market  value.  In
selecting  securities for the Fund, Mitchell Hutchins takes into account various
factors that will affect the volatility of  the Fund's assets, such as the  time
to the next coupon reset date for the securities, the payment characteristics of
the securities and the dollar weighted average life of the securities.
    
 
ADJUSTABLE RATE SECURITIES
 
   
Adjustable  Rate Securities  are instruments  that bear  interest at  rates that
adjust at  periodic intervals  at a  fixed amount  (typically referred  to as  a
'spread')  over the  market levels of  interest rates as  reflected in specified
indexes. The Adjustable Rate Securities in which the Fund invests consist of MBS
that are Government Securities. MBS  are securities that directly or  indirectly
represent  an interest in, or are backed by and are payable from, mortgage loans
secured by real property. MBS are issued in structured financings through  which
a  sponsor securitizes the  underlying mortgage loans  to liquify the underlying
assets or to achieve certain other financial goals.
    
 
     The interest paid on Adjustable Rate Securities and, therefore, the current
income earned by the Fund by investing  in them, is a function primarily of  the
indexes  upon which adjustments are based  and the applicable spread relating to
the securities. Examples of indexes  that may be used  are (1) one-, three-  and
five-year  U.S. Treasury securities  adjusted to a  constant maturity index, (2)
U.S. Treasury bills of three or six  months, (3) the daily Bank Prime Loan  Rate
made  available by the  Federal Reserve Board,  (4) the cost  of funds of member
institutions for the Federal Home
 
                                       7
 
<PAGE>
--------------------------------------------------------------------------------
Loan Bank of San Francisco  and (5) the offered  quotations to leading banks  in
the  London interbank  market for  Eurodollar deposits  of a  specified duration
('LIBOR').
 
   
     The interest  rates  paid  on  Adjustable  Rate  Securities  are  generally
readjusted  periodically to  an increment over  the chosen  interest rate index.
Readjustments occur at intervals  ranging from one to  60 months. The degree  of
volatility  in the market value of the  Adjustable Rate Securities in the Fund's
portfolio is  a  function  of  the  frequency  of  the  adjustment  period,  the
applicable  index and the  degree of volatility  in the applicable  index. It is
also a  function  of the  maximum  increase or  decrease  of the  interest  rate
adjustment  on any one adjustment date, in any one year and over the life of the
securities. These maximum increases and  decreases are typically referred to  as
'caps' and 'floors,' respectively. The Fund does not seek to maintain an overall
average  cap or  floor, although Mitchell  Hutchins considers caps  or floors in
selecting Adjustable Rate Securities for the Fund.
    
 
   
     The  adjustable  interest  rate  feature  underlying  the  Adjustable  Rate
Securities  in which the Fund invests generally acts as a buffer to reduce sharp
changes in  the Fund's  net asset  value  in response  to normal  interest  rate
fluctuations.  As the interest rates on  the mortgages underlying the Fund's MBS
are  reset  periodically,  yields   of  portfolio  securities  gradually   align
themselves  to reflect changes  in market rates  and should cause  the net asset
value of Institutional shares to fluctuate less dramatically than they would  if
the  Fund invested  in more traditional  long-term, fixed  rate debt securities.
During periods of rapidly rising interest rates, however, changes in the  coupon
rate  may temporarily lag behind changes  in the market rate, possibly resulting
in lower  net  asset values  until  the coupon  resets  to market  rates.  Thus,
investors could suffer some principal loss if they sell their shares of the Fund
before  the interest rates  on the underlying mortgages  are adjusted to reflect
current market rates.
    
 
   
     Unlike fixed  rate  mortgages,  which generally  decline  in  value  during
periods  of rising interest rates, the Fund's adjustable rate MBS allow the Fund
to participate in increases  in interest rates  through periodic adjustments  in
the coupons of the underlying mortgages, resulting in both higher current yields
and  lower price fluctuations. In addition, if prepayments of principal are made
on the underlying mortgages  during periods of rising  interest rates, the  Fund
generally  is able to reinvest those amounts in securities with a higher current
rate of return. The Fund  does not benefit from  increases in interest rates  to
the extent that interest rates rise to the point at which they cause the current
coupon  of Adjustable Rate Securities to  exceed the maximum allowable caps. The
Fund's net  asset  values  could vary  to  the  extent that  current  yields  on
Adjustable  Rate  Securities are  different  from market  yields  during interim
periods between the coupon reset dates.
    
 
   
     MBS. The Fund limits its investments  in MBS to those issued or  guaranteed
by  the U.S. Government  or one of its  agencies or instrumentalities, primarily
consisting of securities either guaranteed  by the Government National  Mortgage
Association  ('GNMA')  or issued  by the  Federal National  Mortgage Association
('FNMA') or the Federal Home Loan Mortgage Corporation ('FHLMC'). GNMA, FNMA and
FHLMC are agencies or instrumentalities of the U.S. Government and MBS issued or
guaranteed by them are generally considered  to be of comparable quality to,  or
higher than, privately issued securities rated Aaa by Moody's or AAA by Standard
&  Poor's. GNMA MBS are guaranteed by GNMA and consist of pass-through interests
in  pools   of   mortgage  loans   guaranteed   or  insured   by   agencies   or
instrumentalities of the
    
 
                                       8
 
<PAGE>
--------------------------------------------------------------------------------
   
United  States. FNMA and FHLMC  MBS are issued by  FNMA and FHLMC, respectively,
and most often represent pass-through interests in pools of similarly insured or
guaranteed  mortgage  loans   or  pools  of   conventional  mortgage  loans   or
participations  in the  pools. GNMA,  FNMA and  FHLMC 'pass-through'  MBS are so
named because  they represent  undivided interests  in the  underlying  mortgage
pools  and a proportionate share of both regular interest and principal payments
(net of fees assessed by GNMA, FNMA and FHLMC and any applicable loan  servicing
fees), as well as unscheduled early prepayments on the underlying mortgage pool,
are passed through monthly to the holder of the MBS.
    
 
   
     Timely payment of principal and interest on GNMA MBS is guaranteed by GNMA,
a  wholly  owned corporate  instrumentality of  the  U.S. Government  within the
Department of Housing and  Urban Development, which guarantee  is backed by  the
full  faith and credit of  the U.S. Government. FNMA,  a federally chartered and
privately owned corporation  organized and existing  under the Federal  National
Mortgage  Association Charter  Act, guarantees  timely payment  of principal and
interest on FNMA MBS. FHLMC, a corporate instrumentality of the U.S. Government,
guarantees (1) the timely payment of interest on all FHLMC MBS, (2) the ultimate
collection of  principal with  respect to  some  FHLMC MBS  and (3)  the  timely
payment of principal with respect to other FHLMC MBS. Neither the obligations of
FNMA  nor those of FHLMC are  backed by the full faith  and credit of the United
States. Nevertheless, because of the relationship  of each of these entities  to
the  United  States, MBS  issued by  them  are generally  considered to  be high
quality securities with minimal credit risk.
    
 
   
     Among the specific types of MBS in which the Fund may invest are adjustable
rate  mortgages   ('ARMs'),   which   are   pass-through   mortgage   securities
collateralized  by  mortgages  with  adjustable rather  than  fixed  rates. ARMs
eligible for inclusion in a mortgage pool generally provide for a fixed  initial
mortgage  interest  rate for  either  the first  three, six,  12,  13, 36  or 60
scheduled monthly  payments.  Thereafter,  the interest  rates  are  subject  to
periodic adjustment based on changes to a designated benchmark index.
    
 
   
     A  second  type of  MBS in  which  the Fund  may invest  are collateralized
mortgage obligations  ('CMOs'), which  are  debt obligations  collateralized  by
mortgage  loans or mortgage pass-through securities, issued by instrumentalities
of the U.S. Government. The Fund will not invest in privately issued CMOs.  Such
CMOs  are collateralized  by GNMA, FNMA  or FHLMC  certificates (this collateral
being referred  to  collectively  in  this  Prospectus  as  'Mortgage  Assets').
Multi-class  pass-through securities are equity interests in a trust composed of
Mortgage Assets. Payments of principal of  and interest on the Mortgage  Assets,
and  any reinvestment income  on the Mortgage  Assets, provide the  funds to pay
debt service on  the CMOs  or make  scheduled distributions  on the  multi-class
pass-through  securities. The issuer of a series of CMOs may elect to be treated
as a Real Estate Mortgage Investment Conduit.
    
 
     In a CMO, a series of bonds or certificates is issued in multiple  classes.
Each  class of CMOs, often  referred to as a 'tranche,'  is issued at a specific
fixed or floating coupon  rate and has a  stated maturity or final  distribution
date.  Principal prepayments  on the  Mortgage Assets may  cause the  CMOs to be
retired substantially earlier than their stated maturities or final distribution
dates. Interest is  paid or accrues  on all classes  of the CMOs  on a  monthly,
quarterly  or semi-annual basis.  The principal of and  interest on the Mortgage
Assets may be allocated among the several classes of a CMO series in a number of
different ways. Generally, the purpose of the
 
                                       9
 
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allocation of the cash flow of a CMO to the various classes is to obtain a  more
predictable cash flow to the individual tranches than exists with the underlying
collateral  of the CMO. As a general rule, the more predictable the cash flow is
on a CMO tranche, the lower the anticipated yield will be on that tranche at the
time of issuance relative to prevailing market yields on MBSs.
 
     The specific types  of CMOs the  Fund may  invest in include,  but are  not
limited  to, parallel pay CMOs and Planned Amortization Class CMOs ('PAC Bonds')
issued by  instrumentalities  of the  U.S.  Government. Parallel  pay  CMOs  are
structured  to provide payments of  principal on each payment  date to more than
one class. These simultaneous payments are taken into account in calculating the
stated maturity date or final distribution date of each class, which, like other
CMO  structures,  must  be  retired  by  its  stated  maturity  date  or   final
distribution  date but may be  retired earlier. PAC Bonds  are parallel pay CMOs
that generally  require payments  of a  specified amount  of principal  on  each
payment  date;  the required  principal payment  on PAC  Bonds have  the highest
priority after interest has been paid to all classes.
 
OTHER INVESTMENTS OF THE FUND
 
   
     FIXED RATE  MBS.  Fixed rate  MBS  in which  the  Fund may  invest  consist
primarily  of  fixed  rate pass-through  securities  and fixed  rate  CMOs. Like
Adjustable Rate  Securities, these  fixed  rate securities  may only  be  issued
either  by agencies or instrumentalities of  the U.S. Government. Similarly, the
basic structures with respect to fixed rate MBS are the same as those  described
above  with  respect to  Adjustable  Rate Securities.  The  principal difference
between fixed  rate  securities  and  Adjustable Rate  Securities  is  that  the
interest  rate on the former type of securities is set at a predetermined amount
and does not vary according to changes in any index.
    
 
     GOVERNMENT SECURITIES. The Fund  may invest in,  in addition to  Government
Securities  guaranteed by  GNMA and  issued by  FNMA and  FHLMC described above,
other Government  Securities such  as bills,  certificates of  indebtedness  and
notes  and bonds issued  or guaranteed by  the U.S. Government,  its agencies or
instrumentalities. Among the Government Securities that may be held by the  Fund
are  instruments that  are supported by  the full  faith and credit  of the U.S.
Government; instruments that are supported by the right of the issuer to  borrow
from  the U.S. Treasury; and instruments that are supported solely by the credit
of the instrumentality.
 
     MONEY MARKET INSTRUMENTS.  Pending the investment  of funds resulting  from
the  sale of Fund shares or the liquidation of portfolio holdings in longer term
securities, in order  to shorten  the Fund's average  portfolio maturity  during
temporary  defensive periods or in order  to have available highly liquid assets
to meet anticipated redemptions  of Fund shares or  to pay the Fund's  operating
expenses, the Fund may invest in short-term Government Securities and repurchase
agreements with respect to those securities.
 
INVESTMENT TECHNIQUES AND STRATEGIES
 
The  Fund, in seeking to meet its  investment objective, is authorized to engage
in any  one or  more of  the specialized  investment techniques  and  strategies
described below:
 
     WHEN-ISSUED  AND DELAYED-DELIVERY  SECURITIES. To  secure prices  or yields
deemed advantageous at a  particular time in an  effort to reduce interest  rate
risk,  the Fund  may purchase  securities on  a when-issued  or delayed-delivery
basis, in which case delivery of and payment for
 
                                       10
 
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the securities occurs beyond the normal settlement period. The Fund enters  into
when-issued  or  delayed-delivery  transactions  for  the  purpose  of acquiring
securities  and  not  for  the  purpose  of  leverage  or  trading.  When-issued
securities purchased by the Fund may include securities purchased on a 'when, as
and  if issued' basis under which the  issuance of the securities depends on the
occurrence of  a subsequent  event,  such as  approval  of a  merger,  corporate
reorganization   or  debt  restructuring.  The  Fund  will  establish  with  its
custodian, or with a designated  sub-custodian, a segregated account  consisting
of  cash,  Government  Securities  in  an amount  equal  to  the  amount  of its
when-issued or delayed-delivery purchase commitments.
 
   
     REPURCHASE  AGREEMENTS.  The  Fund  may  engage  in  repurchase   agreement
transactions  with respect  to instruments  in which  the Fund  is authorized to
invest. The Fund may  engage in repurchase  agreement transactions with  certain
member  banks of the Federal  Reserve System and with  certain dealers listed on
the Federal Reserve  Bank of  New York's list  of reporting  dealers. Under  the
terms  of a typical  repurchase agreement, the Fund  would acquire an underlying
debt obligation for a relatively short period (not more than seven days) subject
to an  obligation of  the seller  to repurchase,  and the  Fund to  resell,  the
obligation  at  an agreed-upon  price and  time,  thereby determining  the yield
during the Fund's holding period. Thus, repurchase agreements are considered  to
be collateralized loans. This arrangement results in a fixed rate of return that
is  not subject  to market  fluctuations during  the Fund's  holding period. The
value of  the  securities underlying  a  repurchase  agreement of  the  Fund  is
monitored  on an ongoing basis by Mitchell  Hutchins to ensure that the value is
at least equal at all  times to the total  amount of the repurchase  obligation,
including  interest. Mitchell  Hutchins also  monitors, on  an ongoing  basis to
evaluate potential risks, the creditworthiness  of those banks and dealers  with
which the Fund enters into repurchase agreements.
    
 
     REVERSE  REPURCHASE AGREEMENTS. The Fund  may enter into reverse repurchase
agreement transactions with certain member  banks of the Federal Reserve  System
and  with certain dealers listed on the  Federal Reserve Bank of New York's list
of reporting  dealers. A  reverse repurchase  agreement, which  is considered  a
borrowing  by the Fund, involves a sale by  the Fund of securities that it holds
concurrently with an agreement by the Fund to repurchase the same securities  at
an  agreed upon  price and date.  The Fund  typically invests the  proceeds of a
reverse repurchase agreement in  securities in which the  Fund is authorized  to
invest  or repurchase agreements relating to those securities maturing not later
than the  expiration  of the  reverse  repurchase  agreement. This  use  of  the
proceeds  is  known  as leverage.  The  Fund  enters into  a  reverse repurchase
agreement for leverage purposes only when the interest income to be earned  from
the  investment of  the proceeds  is greater  than the  interest expense  of the
transaction. The Fund may also use the proceeds of reverse repurchase agreements
to provide liquidity  to meet redemption  requests when the  sale of the  Fund's
securities  is  considered  to be  disadvantageous.  The Fund  will  establish a
segregated account with its custodian,  or a designated sub-custodian, in  which
the  Fund will  maintain cash  or Government  Securities equal  in value  to its
obligations with respect to reverse repurchase agreements.
 
     LENDING  PORTFOLIO  SECURITIES.  In  seeking  to  achieve  its   investment
objective  and to hedge against the risk of interest rate fluctuations, the Fund
may lend securities guaranteed by the United States or by specified agencies  of
the United States to well-known and recognized registered brokers or dealers and
banks insured by the Federal Deposit Insurance Corporation
 
                                       11
 
<PAGE>
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('FDIC').  These loans, if and  when made, may not exceed  33 1/3% of the Fund's
assets taken at value. The Fund's loans of securities will be collateralized  by
cash,  letters  of  credit or  Government  Securities. The  cash  or instruments
collateralizing the Fund's loans of securities  will be maintained at all  times
in  a  segregated  account  with  the Fund's  custodian,  or  with  a designated
sub-custodian, in an amount at  least equal to the  current market value of  the
loaned securities.
 
INVESTMENT RESTRICTIONS
 
The  Trust has adopted certain  fundamental investment restrictions with respect
to the Fund that may not be changed without approval of a majority of the Fund's
outstanding voting securities (as defined in the 1940 Act). Included among those
fundamental restrictions are the following:
 
          1. The  Fund  will  not purchase  securities  (other  than  Government
     Securities)  of any issuer if, as a result of the purchase, more than 5% of
     the value of the Fund's total assets would be invested in the securities of
     the issuer, except that up to 25%  of the value of the Fund's total  assets
     may be invested without regard to this 5% limitation.
 
          2.  The Fund will not purchase more  than 10% of the voting securities
     of any one  issuer, except that  this limitation is  not applicable to  the
     Fund's  investments in Government Securities, and up to 25% of the value of
     the Fund's  total  assets  may  be invested  without  regard  to  this  10%
     limitation.
 
          3.  The Fund will not issue  senior securities or borrow money, except
     that the  Fund  may  borrow  from banks  for  temporary,  extraordinary  or
     emergency purposes and enter into reverse repurchase agreements.
 
          4.  The  Fund will  not lend  money to  other persons,  except through
     purchasing  debt  obligations,  entering  into  repurchase  agreements  and
     lending  portfolio securities  in an  amount not to  exceed 33  1/3% of the
     value of the Fund's total assets.
 
          5. The Fund will  invest no more  than 25% of the  value of its  total
     assets  in  securities of  issuers in  any one  industry, except  that this
     limitation is  not  applicable  to  the  Fund's  investment  in  Government
     Securities.
 
     Notwithstanding  the foregoing  investment restrictions,  which are imposed
under the 1940 Act and certain state  laws, the Fund will invest exclusively  in
Government  Securities, repurchase agreements  and reverse repurchase agreements
with respect to those  securities and loans of  those securities. Certain  other
investment  restrictions  adopted by  the  Trust with  respect  to the  Fund are
described in the Statement of Additional Information.
 
RISK FACTORS AND SPECIAL CONSIDERATIONS
 
Investing in the Fund involves risks  and special considerations, such as  those
described below:
 
     INTEREST  RATE RISK. The Fund's portfolio is affected by general changes in
interest rates that result in increases or decreases in the market value of  the
obligations  held by the Fund. The market value of the obligations in the Fund's
portfolio can be expected  to vary inversely to  changes in prevailing  interest
rates.   Investors  should  also   recognize  that,  in   periods  of  declining
 
                                       12
 
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interest rates, the  Fund's yield tends  to be somewhat  higher than  prevailing
market rates, and in periods of rising interest rates, the Fund's yield tends to
be  somewhat lower. In addition, when interest rates are falling, money received
by the Fund  from the  continuous sale  of its  shares normally  is invested  in
portfolio  instruments producing lower yields than the balance of its portfolio,
thereby reducing the Fund's current yield. In periods of rising interest  rates,
the opposite result can be expected to occur.
 
   
     PREPAYMENT  RISK. The  types of securities  in which the  Fund invests have
certain unique attributes  that warrant  special consideration  or that  present
risks  that may  not exist in  other types  of mutual fund  investments. Some of
these  risks  and  special  considerations  are  peculiar  to  Adjustable   Rate
Securities  whereas others, most notably the risk of prepayments, pertain to the
characteristics of MBS generally.
    
 
   
     Payments of principal of and interest on MBS are made more frequently  than
are  payments on conventional  debt securities. In addition,  holders of MBS may
receive unscheduled payments of principal  at any time representing  prepayments
on  the underlying mortgage loans. These prepayments  may usually be made by the
related obligor without  penalty. Prepayment  rates are affected  by changes  in
prevailing  interest rates and  numerous other economic,  geographic, social and
other factors including  changes in  mortgagors' housing  needs, job  transfers,
unemployment,  mortgagors' net equity in  the mortgaged properties and servicing
decisions. Changes in the rate of prepayments will generally affect the yield to
maturity of the security. Moreover, when the holder of the security attempts  to
reinvest  prepayments or even the scheduled  payments of principal and interest,
it may receive a rate of interest that  is higher or lower than the rate on  the
MBS   originally  held.  Mortgage  foreclosures  and  principal  prepayments  on
securities purchased by  the Fund at  a premium also  impose a risk  of loss  of
principal  because the premium may not have been fully amortised at the time the
principal is repaid  in full. If  MBS are  bought at a  discount, however,  both
scheduled  payments  of  principal  and  unscheduled  prepayments  will increase
current and total returns and will  accelerate the recognition of income  which,
when  distributed to shareholders, will be  taxable as ordinary income. Mitchell
Hutchins will consider remaining maturities or estimated average lives of MBS in
selecting them for the Fund.
    
 
     ADJUSTABLE RATE SECURITIES. The interest rate reset features of  Adjustable
Rate  Securities held by the Fund reduces the  effect on the net asset values of
Fund shares caused  by changes  in market interest  rates. The  market value  of
Adjustable  Rate Securities and, therefore, the Fund's net asset value, however,
may vary to the extent that the current interest rates on the securities differs
from market interest rates  during periods between  interest reset dates.  These
variations  in value occur inversely  to changes in market  interest rates. As a
result, if market interest rates rise above the current rate on the  securities,
the  value of the securities will decrease; conversely, if market interest rates
fall below the current rate on the securities, the value of the securities  will
rise.  If investors in the Fund sold their shares during periods of rising rates
before an adjustment occurred, those investors may suffer some loss. The  longer
the  adjustment intervals  on Adjustable Rate  Securities held by  the Fund, the
greater the potential for fluctuations in the Fund's net asset value.
 
     Fund  shareholders  receive  increased  income   as  a  result  of   upward
adjustments of the interest rates on Adjustable Rate Securities held by the Fund
in  response to  market interest  rates. The  Fund and  its shareholders  do not
benefit, however, from increases in market interest rates
 
                                       13
 
<PAGE>
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once those  rates rise  to  the point  at  which they  cause  the rates  on  the
Adjustable  Rate Securities  to reach their  maximum adjustment  rate, annual or
lifetime caps. Because  of their  interest rate  adjustment feature,  Adjustable
Rate  Securities are not an effective means of 'locking-in' attractive rates for
periods in excess  of the adjustment  period. In addition,  mortgagors on  loans
underlying  MBS with  respect to which  the underlying mortgage  assets carry no
agency or instrumentality  guarantee are often  qualified for the  loans on  the
basis  of  the  original payment  amounts;  the  mortgagor's income  may  not be
sufficient to enable  it to continue  making its loan  payments as the  payments
increase, resulting in a greater likelihood of default.
    
 
     Any  benefits to  the Fund  and its  shareholders from  an increase  in the
Fund's net asset values caused by declining market interest rates is reduced  by
the potential for increased prepayments and a decline in the interest rates paid
on  Adjustable  Rate Securities  held  by the  Fund.  When market  rates decline
significantly, the prepayment rate  on Adjustable Rate  Securities is likely  to
increase  as  borrowers  refinance  with  fixed  rate  mortgage  loans,  thereby
decreasing the capital appreciation potential of Adjustable Rate Securities.  As
a  result, the Fund  should not be  viewed as consistent  with any objectives of
seeking capital appreciation.
 
     WHEN-ISSUED AND  DELAYED-DELIVERY  SECURITIES. Securities  purchased  on  a
when-issued  or delayed-delivery basis  may expose the Fund  to risk because the
securities may experience fluctuations in value prior to their actual  delivery.
The   Fund  will   not  accrue   income  with   respect  to   a  when-issued  or
delayed-delivery  security  prior  to  its  stated  delivery  date.   Purchasing
securities on a when-issued or delayed-delivery basis can involve the additional
risk that the yield available in the market when the delivery takes place may be
higher than that obtained in the transaction itself.
 
     REPURCHASE  AGREEMENTS. In entering  into a repurchase  agreement, the Fund
bears a  risk of  loss in  the event  that the  other party  to the  transaction
defaults on its obligations and the Fund is delayed or prevented from exercising
its  rights to  dispose of  the underlying securities,  including the  risk of a
possible decline in the value of the underlying securities during the period  in
which  the  Fund seeks  to  assert its  rights to  them,  the risk  of incurring
expenses associated with asserting those rights and the risk of losing all or  a
part of the income from the agreement.
 
     REVERSE  REPURCHASE AGREEMENTS. A reverse repurchase agreement involves the
risk that the market value  of the securities retained  by the Fund may  decline
below  the  price  of the  securities  the Fund  has  sold but  is  obligated to
repurchase under the  agreement. In the  event the buyer  of securities under  a
reverse  repurchase  agreement files  for bankruptcy  or becomes  insolvent, the
Fund's use  of  the  proceeds of  the  agreement  may be  restricted  pending  a
determination  by the party, or its trustee  or receiver, whether to enforce the
Fund's obligation to repurchase the securities.
 
     LENDING PORTFOLIO SECURITIES. In  lending securities to registered  brokers
or dealers and FDIC insured banks, the Fund may be subject to risks, which, like
those  associated  with other  extensions of  credit,  include possible  loss of
rights in the collateral should the borrower fail financially.
 
                                       14
 
<PAGE>
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PORTFOLIO TURNOVER
 
   
The Fund's portfolio is  actively managed. The portfolio  turnover rate for  the
period  March 24, 1994 through November 30, 1994 was 170.25%. Portfolio turnover
may vary  greatly from  year to  year and  will not  be a  limiting factor  when
Mitchell  Hutchins deems portfolio  changes appropriate. A  higher turnover rate
(100% or more)  will involve  correspondingly greater  transaction costs,  which
will  be  borne  directly  by  the Fund,  and  may  increase  the  potential for
short-term capital gains. Short-term gains realized from portfolio  transactions
are  taxable to shareholders  as ordinary income.  See 'Dividends, Distributions
and Taxes -- Taxes.'
    
 
                             MANAGEMENT OF THE FUND
 
TRUSTEES AND OFFICERS
 
The business and  affairs of the  Fund are  managed under the  direction of  the
Trust's  Board  of  Trustees, and  the  day-to-day  operations of  the  Fund are
conducted through or under the direction of officers of the Trust. The Statement
of Additional Information contains general background information regarding each
Trustee and officer of the Trust.
 
   
    
   
INVESTMENT ADVISER AND ADMINISTRATOR
    
 
   
Mitchell Hutchins, 1285 Avenue of the Americas, New York, New York 10019, serves
as the  Fund's investment  adviser  and administrator.  Mitchell Hutchins  is  a
wholly  owned subsidiary of PaineWebber, which in  turn is wholly owned by Paine
Webber Group  Inc. ('PW  Group'), a  publicly owned  financial services  holding
company.  Mitchell  Hutchins,  organized  in  May  1977,  is  registered  as  an
investment adviser under the  Investment Advisers Act of  1940 and as a  broker-
dealer  under the  Securities Exchange  Act of  1934. As  of February  28, 1995,
Mitchell Hutchins or PaineWebber served as investment adviser or sub-adviser  to
42  investment  companies with  an aggregate  of  77 separate  portfolios having
aggregate assets of over $26.8 billion.
    
 
   
     As a result of an asset  purchase transaction by and among Kidder,  Peabody
Group  Inc., its parent, General Electric  Company, and PW Group, the investment
advisory services provided to the Fund by Kidder Peabody Asset Management,  Inc.
('KPAM'),  the Fund's predecessor manager  and investment adviser, were assumed,
on an interim basis,  by Mitchell Hutchins  as of February  13, 1995. After  the
interim  period,  and subject  to shareholder  approval, Mitchell  Hutchins will
serve as the  Fund's investment  adviser and administrator.  During the  interim
period and thereafter, assuming shareholder approval, the Fund has agreed to pay
Mitchell  Hutchins  the  same  fee for  investment  advisory  and administrative
services that the Fund agreed to pay KPAM for such services. No assurance can be
made that requisite shareholder approval of these arrangements will be obtained.
    
 
   
     As the  Fund's investment  adviser  and administrator,  Mitchell  Hutchins,
subject  to the supervision and  direction of the Trust's  Board of Trustees, is
generally responsible for furnishing,  or causing to be  furnished to the  Fund,
investment  advisory  and  management  services.  Included  among  the  specific
services provided by Mitchell Hutchins as administrator are: the maintenance and
furnishing of all  required records  or reports pertaining  to the  Fund to  the
extent  those records or reports  are not maintained or  furnished by the Fund's
transfer agent, custodian or
    
 
                                       15
 
<PAGE>
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other agents  employed by  the  Fund; the  providing of  general  administrative
services  to  the Fund  not  otherwise provided  by  the Fund's  transfer agent,
custodian or other agents  employed by the Fund;  and the payment of  reasonable
salaries  and expenses of  those of the  Fund's officers and  employees, and the
fees and expenses of  those members of  the Trust's Board  of Trustees, who  are
directors, officers or employees of Mitchell Hutchins.
    
 
   
     As  the  Fund's  investment  adviser,  Mitchell  Hutchins,  subject  to the
supervision and direction of the Trust's  Board of Trustees, manages the  Fund's
portfolio in accordance with the investment objective and stated policies of the
Fund,  makes  investment decisions  for the  Fund and  places purchase  and sale
orders for the  Fund's portfolio transactions.  Mitchell Hutchins also  provides
the Fund with investment officers who are authorized by the Board of Trustees to
execute  purchases and sales of  securities on behalf of  the Fund and employs a
professional staff of portfolio managers who draw upon a variety of sources  for
research information for the Fund.
    
 
   
    
   
Dennis  L. McCauley and Nirmal Singh  are jointly responsible for the day-to-day
management of the Fund. Mr. McCauley is a Managing Director and Chief Investment
Officer --  Fixed Income  of Mitchell  Hutchins responsible  for overseeing  all
active  fixed  income investments,  including  domestic and  global  taxable and
tax-exempt mutual  funds.  Prior  to  joining Mitchell  Hutchins  in  1994,  Mr.
McCauley  worked  for IBM  Corporation  where he  was  Director of  Fixed Income
Investments responsible for developing and managing investment strategy for  all
fixed  income and  cash managment  investments of  IBM's pension  fund and self-
insured medical funds.  Mr. McCauley has  also served as  Vice President of  IBM
Credit  Corporation's  mutual  funds and  as  a  member of  the  Retirement Fund
Investment Committee.
    
 
   
     Nirmal Singh  is a  Vice  President of  Mitchell Hutchins  responsible  for
overseeing  investments  in  the mortgage-backed  securities  section.  Prior to
joining Mitchell Hutchins  in 1993,  Mr. Singh  worked for  Merrill Lynch  Asset
Management  where he was  a member of the  portfolio management team responsible
for several diversified funds, including mortgage-backed securities funds,  with
assets  totalling $8  billion. Mr.  Singh has also  held the  position of Senior
Portfolio Manager at Nomura  Mortgage Funds Management and  prior to Nomura,  he
worked as a transactions strategist at Shearson Lehman Brothers Inc. and for two
years at the Federal National Mortgage Association.
    
 
   
     The  Fund pays Mitchell Hutchins for its services as investment adviser and
administrator to the Fund a  fee that is accrued daily  and paid monthly at  the
annual  rate of .45% of  the Fund's average daily  net assets. Mitchell Hutchins
has undertaken to  reduce or otherwise  limit the  expenses of the  Fund, on  an
annualized  basis, to .55% of the Fund's  average daily net assets in respect of
Institutional shares. This undertaking may be terminated by Mitchell Hutchins at
any time in its  sole discretion. From  time to time,  Mitchell Hutchins in  its
sole  discretion may waive all or a portion of its fee and/or reimburse all or a
portion of the Fund's operating expenses.
    
 
   
     Although investment  decisions for  the Fund  are made  independently  from
those  of the  other accounts managed  by Mitchell Hutchins,  investments of the
type the Fund may make may also be  made by those other accounts. When the  Fund
and  one or  more other  accounts managed by  Mitchell Hutchins  are prepared to
invest in, or desire to dispose of, the same security, available investments  or
opportunities  for  sales  are  allocated  in  a  manner  believed  by  Mitchell
    
 
                                       16
 
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Hutchins to be equitable  to each. In some  cases, this procedure may  adversely
affect  the price  paid or  received by  the Fund  or the  size of  the position
obtained or disposed of by the Fund.
    
 
                       PURCHASE AND REDEMPTION OF SHARES
 
PURCHASE PROCEDURES
 
   
Mitchell  Hutchins  is  the  distributor  of  the  Trust's  shares.  The  Fund's
Institutional  shares  are available  for  purchase by  institutional investors,
although the  Trust  and Mitchell  Hutchins  reserve  the right  to  waive  this
requirement.  Purchase  orders for  Institutional shares  of  the Fund  that are
received prior to the close  of regular trading on  the New York Stock  Exchange
(the  'NYSE') on a particular day (currently 4:00 p.m., Eastern time) are priced
according to  the  net asset  value  determined  on that  day.  Purchase  orders
received  after the close  of regular trading on  the NYSE are  priced as of the
time net asset  value per share  is next determined.  See 'Determination of  Net
Asset  Value' below for a description of the  times at which net asset value per
share is determined.
    
 
   
     In order  to  maximize  earnings,  the Fund  attempts  to  be  invested  as
completely as practicable and is normally required to make settlement in Federal
funds for securities purchased. Accordingly, payment for Institutional shares is
not  effective  until  received in  or  converted to  Federal  funds immediately
available to the Trust. The minimum initial investment in the Fund is  $250,000,
which  may be waived at the discretion of Mitchell Hutchins. There is no minimum
subsequent investment. The Trust and Mitchell Hutchins each reserve the right to
reject any purchase order for any reason.
    
 
   
     PURCHASES THROUGH  PAINEWEBBER OR  CORRESPONDENT FIRMS.  Purchases  through
PaineWebber  investment executives or correspondent firms  may be made in person
or by  mail,  telephone  or wire;  the  minimum  wire purchase  is  $1  million.
Investment  executives and correspondent firms  are responsible for transmitting
purchase orders to PaineWebber's New  York City offices promptly. Investors  may
pay  for  purchases  with checks  drawn  on U.S.  banks  or with  funds  held in
brokerage accounts at PaineWebber or its correspondent firms. Payment is due  on
the same Business Day after the order is received at PaineWebber's New York City
offices.  A 'Business Day' is  any day, Monday through  Friday, on which the New
York Stock Exchange, Inc. ('NYSE') is  open for business. See 'Determination  of
Net Asset Value.'
    
 
   
     PURCHASES  THROUGH THE  TRANSFER AGENT.  Investors who  are not PaineWebber
clients may purchase shares  of the Fund through  the Transfer Agent. Shares  of
the  Fund  may  be purchased,  and  an  account with  the  Fund  established, by
completing and signing an application form and mailing it, together with a check
to cover the  purchase, to the  Transfer Agent: PFPC  Inc., Attn:  Institutional
Adjustable Rate Government Portfolio, P.O. Box 8950, Wilmington, Delaware 19899.
Subsequent investments need not be accompanied by an application.
    
 
REDEMPTION PROCEDURES
   
    
 
   
As  described  below, Fund  shares  may be  redeemed  at their  net  asset value
(subject to to any applicable  contingent deferred sales charge) and  redemption
proceeds will be paid on the same
    
 
                                       17
 
<PAGE>
--------------------------------------------------------------------------------
   
day  of  the receipt  of a  redemption request.  PaineWebber clients  may redeem
non-certificated shares  through PaineWebber  or  its correspondent  firms;  all
other shareholders must redeem through the Transfer Agent.
    
 
   
     REDEMPTION  THROUGH PAINEWEBBER OR CORRESPONDENT FIRMS. PaineWebber clients
may submit redemption requests to  their investment executives or  correspondent
firms  in person or by telephone, mail or wire. As the Fund's agent, PaineWebber
may honor a  redemption request  by repurchasing  Fund shares  from a  redeeming
shareholder  at the shares' net asset value next determined after receipt of the
request by PaineWebber's  New York  City offices.  On the  same day,  repurchase
proceeds  will  be paid  by  check or  credited  to the  shareholder's brokerage
account at the  election of the  shareholder. PaineWebber investment  executives
and  correspondent  firms  are responsible  for  promptly  forwarding redemption
requests to PaineWebber's New York City offices.
    
 
   
     PaineWebber reserves  the right  not to  honor any  redemption request,  in
which  case PaineWebber promptly will forward  the request to the Transfer Agent
for treatment as described below.
    
 
   
     REDEMPTION THROUGH  THE  TRANSFER  AGENT. Fund  shareholders  who  are  not
PaineWebber clients must redeem their shares through the Transfer Agent by mail;
other  shareholders  also may  redeem Fund  shares  through the  Transfer Agent.
Shareholders should mail  redemption requests  directly to  the Transfer  Agent:
PFPC  Inc., Attn: Institutional Adjustable Rate Governmental Portfolio, P.O. Box
8950, Wilmington, Delaware 19899. A redemption  request will be executed at  the
net asset value next computed after it is received in 'good order.' 'Good order'
means  that the request  must be accompanied  by the following:  (1) a letter of
instruction or a stock assignment specifying  the number of shares or amount  of
investment  to be redeemed (or  that all shares credited  to the Fund account be
redeemed), signed by all registered owners of  the shares in the exact names  in
which  they are registered, (2) a guarantee  of the signature of each registered
owner by  an  eligible institution  acceptable  to  the Transfer  Agent  and  in
accordance with SEC rules, such as a commercial bank, trust company or member of
a  recognized stock exchange, (3) other  supporting legal documents for estates,
trusts, guardianships,  custodianships, partnerships  and corporations  and  (4)
duly  endorsed  share certificates,  if  any. Shareholders  are  responsible for
ensuring that a request for redemption is received in 'good order.'
    
 
   
     ADDITIONAL  INFORMATION   ON   REDEMPTIONS.   A   shareholder   who   holds
non-certificated  Fund shares may have redemption proceeds of $1 million or more
wired to the shareholder's  PaineWebber brokerage account  or a commercial  bank
account   designated  by  the  shareholder.  Questions  about  this  option,  or
redemption requirements  generally,  should  be referred  to  the  shareholder's
PaineWebber investment executive or correspondent firm, or the Transfer Agent if
the  shares are not  held in a  PaineWebber brokerage account.  If a shareholder
requests redemption of shares which were purchased recently, the Fund may  delay
payment  until it is assured that good payment has been received. In the case of
purchases by check, this can take up to 15 days.
    
 
                                       18
 
<PAGE>
--------------------------------------------------------------------------------
 
   
    
EXCHANGES
 
   
Institutional shares of the  Fund may be exchanged  for Institutional shares  of
the  Money Market Fund, Government Securities Fund and Treasury Securities Fund,
all of which are investment portfolios of Liquid Institutional Reserves, at  the
net asset value next determined. Exchange transactions may be effected through a
PaineWebber  Investment  Executive. The  exchange privilege  may be  modified or
terminated in  accordance  with  the  rules  of the  SEC  and  is  available  to
shareholders  resident  in any  state in  which the  fund shares  being acquired
legally may be sold.
    
 
   
    
OTHER MATTERS
 
Fund shares are  sold and redeemed  without charge  by the Fund.  The Trust  may
suspend  the right of redemption or postpone the date of payment upon redemption
(as well as suspend or postpone the recording of the transfer of its shares) for
such periods as permitted under the 1940  Act. The Trust may also redeem  shares
involuntarily  under certain special circumstances described in the Statement of
Additional Information under 'Purchase and Redemption of Shares.'
 
                        DETERMINATION OF NET ASSET VALUE
 
Net asset value per Institutional share  of the Fund is calculated by  Investors
Fiduciary  Trust Company  ('IFTC'), the  Fund's custodian,  on each  day, Monday
through Friday,  except  on days  on  which the  NYSE  is closed.  The  NYSE  is
currently  scheduled  to be  closed  on New  Year's  Day, Presidents'  Day, Good
Friday, Memorial Day, Independence Day,  Labor Day, Thanksgiving and  Christmas,
and on the preceding Friday when one of those holidays falls on a Saturday or on
the subsequent Monday when one of those holidays falls on a Sunday.
 
     Net asset value per Institutional share of the Fund is determined as of the
close  of regular trading on the NYSE, and  is computed by dividing the value of
the Fund's net assets attributable to  Institutional shares by the total  number
of  Institutional  shares  outstanding. Generally,  the  Fund's  investments are
valued at market value or,  in the absence of a  market value, at fair value  as
determined by or under the direction of the Trust's Board of Trustees.
 
     Investments   in   Government  Securities   and  other   securities  traded
over-the-counter, other than short-term  investments that mature  in 60 days  or
less,  are valued  at the  average of  the quoted  bid and  asked prices  in the
over-the-counter market. Short-term investments that  mature in 60 days or  less
are  valued on the basis of amortized cost (which involves valuing an investment
at its cost and, thereafter, assuming a constant amortization to maturity of any
discount or premium, regardless of the  effect of fluctuating interest rates  on
the  market value of the  investment) when the Board  of Trustees has determined
that amortized cost represents fair value.  A security that is primarily  traded
on  a stock exchange is valued at the last sale price on that exchange or, if no
sales occurred during the day, at the current quoted bid price.
 
     In carrying out the  Board's valuation policies, IFTC  may consult with  an
independent pricing service retained by the Trust. Further information regarding
the  Fund's  valuation  policies is  contained  in the  Statement  of Additional
Information.
 
                                       19
 
<PAGE>
--------------------------------------------------------------------------------
 
                       DIVIDENDS, DISTRIBUTIONS AND TAXES
 
DIVIDENDS AND DISTRIBUTIONS
 
   
Dividends from  net  investment  income  of the  Fund  are  declared  daily  and
distributed monthly and distributions of net realized capital gains of the Fund,
if  any, are  declared and distributed  at least annually.  Unless a shareholder
instructs the Fund that dividends and capital gain distributions should be  paid
in  cash and credited to the  shareholder's Account, dividends and capital gains
distributions are  reinvested automatically  at net  asset value  in  additional
Institutional  shares.  The Fund  is subject  to a  4% nondeductible  excise tax
measured with respect to certain undistributed amounts of net investment  income
and  capital gains. If necessary to avoid the  imposition of this tax, and if in
the best interests of its shareholders, the Fund will declare and pay  dividends
of  its net investment  income and distributions  of its net  capital gains more
frequently than stated above.
    
 
     Shares of the Fund begin earning dividends  on the day on which the  shares
are issued, the date of issuance customarily being the settlement date, which is
the  date on which the Fund receives  payment for the shares. Shares continue to
earn dividends until the day prior to the settlement date of a redemption.
 
TAXES
 
   
The Trust intends that  the Fund continue  to qualify each  year as a  regulated
investment  company within the meaning of the  Internal Revenue Code of 1986, as
amended. To qualify  as a regulated  investment company for  federal income  tax
purposes,  the Fund limits its income and  investments so that (1) less than 30%
of its gross income  is derived from  the sale or  disposition of stocks,  other
securities   and  certain  financial   instruments  (including  certain  forward
contracts) that were held  for less than  three months and (2)  at the close  of
each  quarter of the taxable year  (a) not more than 25%  of the market value of
the Fund's total  assets is invested  in the securities  (other than  Government
Securities)  of a single issuer or of two or more issuers controlled by the Fund
that are engaged  in the  same or  similar trades  or businesses  or in  related
trades  or businesses  and (b) at  least 50% of  the market value  of the Fund's
total assets  is  represented  by  (i) cash  and  cash  items,  (ii)  Government
Securities and (iii) other securities limited in respect of any one issuer to an
amount  not greater  in value than  5% of the  market value of  the Fund's total
assets and to  not more than  10% of  the outstanding voting  securities of  the
issuer.  The requirements for  qualification may cause the  Fund to restrict the
degree to  which  it sells  or  otherwise  disposes of  securities  and  certain
financial  instruments held for less than three months. If the Fund qualifies as
a regulated investment company and meets certain distribution requirements,  the
Fund  will not be subject to federal income tax on its net investment income and
net realized capital gains that it distributes to its shareholders.
    
 
     Dividends paid by the Fund out  of net investment income and  distributions
of  net realized  short-term capital  gains will  be taxable  to shareholders as
ordinary income,  whether received  in  cash or  reinvested in  additional  Fund
shares. Distributions of net realized long-term capital gains will be taxable to
shareholders as long-term capital gain, regardless of how long shareholders have
held  their  shares  and  whether  the distributions  are  received  in  cash or
reinvested in
 
                                       20
 
<PAGE>
--------------------------------------------------------------------------------
additional shares. Dividends and distributions  paid by the Fund will  generally
not   qualify  for  the  federal  dividends  received  deduction  for  corporate
shareholders.
 
   
     Statements as to the  tax status of each  Fund shareholder's dividends  and
distributions  will  be  mailed  annually. Shareholders  will  also  receive, as
appropriate, various  written  notices  regarding  the  tax  status  of  certain
dividends  and distributions that were paid (or  that are treated as having been
paid) by  the Fund  to  its shareholders  during  the preceding  calendar  year,
including   the  amount  of  dividends  that  represent  interest  derived  from
Government Securities.
    
 
     Shareholders  are  urged  to  consult  their  tax  advisors  regarding  the
application  of federal,  state, local  and foreign  tax laws  to their specific
situations before investing in the Fund.
 
                            PERFORMANCE INFORMATION
 
From time to  time, the Trust  may advertise  the 30-day 'yield'  of the  Fund's
Institutional  shares. The yield refers to the income generated by an investment
in Institutional shares over the  30-day period identified in the  advertisement
and  is computed by dividing  the net investment income  per share earned by the
Institutional shares during the period by the  net asset value per share of  the
Institutional  shares on the last day of the period. This income is 'annualized'
by assuming that the amount  of income is generated  each month over a  one-year
period and is compounded semi-annually. The annualized income is then shown as a
percentage of the net asset value.
 
     From time to time, the Trust may advertise the Fund's 'average annual total
return'  over various  periods of  time for  Institutional shares.  Total return
figures, which are based on historical earnings and are not intended to indicate
future performance, show the average percentage change in value of an investment
in Institutional shares from the beginning date of a measuring period to the end
of that period. These figures reflect changes in the price of shares and  assume
that  any income dividends  and/or capital gains distributions  made by the Fund
during the period were reinvested in Institutional shares. Total return  figures
will be given for the most recent one- and five-year periods, or for the life of
the  Fund to the extent that it has not been in existence for the full length of
those periods,  and may  be  given for  other  periods as  well,  such as  on  a
year-by-year basis. The average annual total return for any one year in a period
longer  than one year might  be greater or less than  the average for the entire
period.
 
     The Trust  may  quote 'aggregate  total  return' figures  with  respect  to
Institutional  shares for various periods, representing the cumulative change in
value of an investment for the  specific period and reflecting changes in  share
prices and assuming reinvestment of dividends and distributions. Aggregate total
return  may be shown by  means of schedules, charts  or graphs, and may indicate
subtotals of the various components of  total return (that is, changes in  value
of  initial  investment,  income  dividends  and  capital  gains distributions).
Reflecting compounding over a longer period of time, aggregate total return data
generally will be higher than average annual total return data.
 
     The Trust may,  in addition  to quoting the  Institutional shares'  average
annual and aggregate total returns, advertise actual annual and annualized total
return  performance  data  for  various  periods  of  time.  Actual  annual  and
annualized total returns may be shown by means of
 
                                       21
 
<PAGE>
--------------------------------------------------------------------------------
schedules, charts  or graphs.  Actual  annual or  annualized total  return  data
generally  will be lower  than average annual total  return data, which reflects
compounding of return.
 
     In reports or other communications to Fund shareholders and in  advertising
material,  the Trust may compare the  Institutional shares' performance with the
performance of other mutual  funds (or analogous classes  thereof) as listed  in
rankings   prepared  by   Lipper  Analytical   Services  Inc.,   CDA  Investment
Technologies, Inc. or similar investment  services that monitor the  performance
of  mutual funds or as set out  in the nationally recognized publications listed
below. The  Trust  may  also  include in  communications  to  Fund  shareholders
evaluations  of the Fund published by nationally recognized ranking services and
by financial  publications that  are nationally  recognized, such  as  Barron's,
Business  Week,  Forbes, Institutional  Investor, Investor's  Daily, Kiplinger's
Personal Finance Magazine, Morningstar Mutual  Fund Values, Money, The New  York
Times,  USA Today and The Wall  Street Journal. Any given performance comparison
should  not  be  considered  as  representative  of  the  Institutional  shares'
performance for any future period.
 
                              GENERAL INFORMATION
 
ORGANIZATION OF THE TRUST
 
   
The  Trust is registered under the 1940 Act as an open-end management investment
company and was formed as a business  trust pursuant to a Declaration of  Trust,
as  amended  from  time to  time  (the  'Declaration'), under  the  laws  of The
Commonwealth of Massachusetts on October 14, 1993. The Fund commenced operations
on March 24, 1994. The Declaration  authorizes the Trust's Board of Trustees  to
create separate series, and within each series separate classes, of an unlimited
number  of shares of  beneficial interest, par  value $.001 per  share. The Fund
offers two  separate classes  of shares  -- Institutional  shares and  Financial
Intermediary shares. Shares of each class represent equal, pro rata interests in
the  Fund and bear expenses and accrue daily dividends in the same manner except
that Financial Intermediary shares  bear fees payable by  the Fund to  financial
intermediaries  for  services they  provide to  the  beneficial owners  of these
shares at the maximum annual rate of .25% of the Fund's net assets  attributable
to  Financial Intermediary  shares. Mitchell  Hutchins has  agreed to  limit the
expenses of the  Fund, on an  annualized basis,  to .80% of  the Fund's  average
daily  net asset value in respect of Financial Intermediary shares. In addition,
financial intermediaries  may directly  charge  beneficial owners  of  Financial
Intermediary  shares with fees relating to their investments, which are required
to be disclosed to  those owners by  the intermediaries. PaineWebber  Investment
Executives  and other persons  remunerated on the  basis of sales  of shares may
receive different levels of  compensation for selling one  class of shares  over
another.
    
 
     When  issued, Fund  shares are  fully paid  and non-assessable.  Shares are
freely transferable and have no pre-emptive, subscription or conversion  rights.
Each  class represents an identical interest in the Fund's investment portfolio.
As a  result, the  classes have  the same  rights, privileges  and  preferences,
except  with respect  to: (1)  the designation of  each class;  (2) the expenses
allocable exclusively to each  class; (3) voting  rights on matters  exclusively
affecting  a single  class; and  (4) the exchange  privilege of  each class. The
Board of Trustees does not anticipate that there will be any conflicts among the
interests of the holders of the  different classes. The Trustees, on an  ongoing
basis,    will   consider   whether   any    conflict   exists   and,   if   so,
 
                                       22
 
<PAGE>
--------------------------------------------------------------------------------
take appropriate action.  Certain aspects  of the  shares may  be changed,  upon
notice  to Fund shareholders, to satisfy certain tax regulatory requirements, if
the change is deemed necessary by the Trust's Board of Trustees.
 
     Shareholders of the Fund are entitled to one vote for each full share  held
and  fractional  votes  for  fractional  shares  held.  Voting  rights  are  not
cumulative and, as  a result,  the holders  of more  than 50%  of the  aggregate
shares  of the  Trust may elect  all of  the Trustees. Generally,  shares of the
Trust will be voted on a Trust-wide basis on all matters except those  affecting
only  the  interests  of one  series,  such  as the  Fund's  investment advisory
agreement. In turn, shares of the Fund will be voted on a Fund-wide basis on all
matters except those  affecting only  the interests of  one class,  such as  the
shareholder servicing arrangements relating to Financial Intermediary shares.
 
     The  Trust  intends to  hold  no annual  meetings  of shareholders  for the
purpose of  electing  Trustees unless,  and  until such  time  as, less  than  a
majority  of  the Trustees  holding office  have  been elected  by shareholders.
Shareholders of record of no less  than two-thirds of the outstanding shares  of
the  Trust may remove a Trustee through a declaration in writing or by vote cast
in person or by proxy  at a meeting called for  that purpose. A meeting will  be
called  for the  purpose of voting  on the removal  of a Trustee  at the written
request of holders of 10% of the Trust's outstanding shares. Shareholders of the
Fund who satisfy certain criteria will be assisted by the Trust in communicating
with other shareholders in seeking the holding of the meeting.
 
REPORTS TO SHAREHOLDERS
 
The Trust sends Fund shareholders semi-annual and annual reports, each of  which
includes  a list of the investment securities held  by the Fund as of the end of
the period covered by the report.
 
                        CUSTODIAN AND TRANSFER, DIVIDEND
                            AND RECORDKEEPING AGENT
 
   
IFTC, located at 127  West 10th Street, Kansas  City, Missouri 64105, serves  as
the Fund's custodian. PFPC Inc., a subsidiary of PNC Bank, National Association,
whose  principal address  is 400  Bellevue Parkway,  Wilmington, Delaware 19809,
serves as the Fund's transfer, dividend and recordkeeping agent.
    
 
                                       23
<PAGE>
   No person has been authorized to give any information or to make any
   representations not contained in this Prospectus, or in the
   Statement of Additional Information incorporated into this
   Prospectus by reference, in connection with the offering made by
   this Prospectus and, if given or made, any such information or
   representations must not be relied upon as having been authorized by
   the Fund or its distributor. This Prospectus does not constitute an
   offering by the Fund or by its distributor in any jurisdiction in
   which the offering may not lawfully be made.
 
   
<TABLE>
<S>                                            <C>
---------------------------------------------------
CONTENTS
---------------------------------------------------
Fee Table                                              2
---------------------------------------------------
Highlights                                             3
---------------------------------------------------
Financial Highlights                                   6
---------------------------------------------------
Investment Objective and Policies                      7
---------------------------------------------------
Management of the Fund                                15
---------------------------------------------------
Purchase and Redemption of Shares                     17
---------------------------------------------------
Determination of Net Asset Value                      19
---------------------------------------------------
Dividends, Distributions and Taxes                    20
---------------------------------------------------
Performance Information                               21
---------------------------------------------------
General Information                                   22
---------------------------------------------------
Custodian and Transfer, Dividend
  and Recordkeeping Agent                             23
---------------------------------------------------
</TABLE>
    
 
                                                              ------------------
 
 
   
<TABLE>
<S>                           <C>
                               INSTITUTIONAL
                                  ADJUSTABLE
                                        RATE
                                  GOVERNMENT
                                   PORTFOLIO
 
                              PROSPECTUS
 
                              MARCH 28, 1995
 
                              INSTITUTIONAL SHARES
</TABLE>
    
 
                                                              ------------------
<PAGE>
   
Prospectus                                                        March 28, 1995
--------------------------------------------------------------------------------
    
 
               INSTITUTIONAL ADJUSTABLE RATE GOVERNMENT PORTFOLIO
                         FINANCIAL INTERMEDIARY SHARES
 
   
    1285 AVENUE OF THE AMERICAS   NEW YORK, NEW YORK 10019   (800) 543-3373
    
 
   
Institutional  Adjustable Rate  Government Portfolio  (the 'Fund'),  a series of
Institutional Series Trust (the 'Trust'),  seeks to provide high current  income
while  limiting the degree of fluctuation of  its net asset value resulting from
movements in  interest  rates. The  Fund  seeks  to achieve  this  objective  by
investing   primarily   in   adjustable   rate   securities   ('Adjustable  Rate
Securities'). The Fund invests only in securities that are issued or  guaranteed
by   the  U.S.  Government,  its   agencies  or  instrumentalities  ('Government
Securities'). Although the Fund's  portfolio may be  expected to experience  low
volatility  due to the unique characteristics of Adjustable Rate Securities, the
Fund is not a money market fund  that attempts to maintain a constant net  asset
value  and the Fund's investment portfolio can be expected to experience greater
volatility than that of a money market fund.
    
 
Financial Intermediary shares of  the Fund are available  for purchase by  banks
and  other  financial intermediaries,  without imposition  of any  sales charge,
deferred sales charge  or any  other transaction fee  for the  benefit of  their
members  and  customers and  bear  all fees  payable  by the  Fund  to financial
intermediaries for certain  services they  provide to the  beneficial owners  of
these  shares.  Financial  Intermediaries may  include  national  banks, federal
savings institutions,  federal  credit unions,  corporations,  trust  companies,
investment  bankers  and brokers,  insurance companies,  investment counsellors,
pension  funds,  employee  benefit  plans,   law  firms,  trusts,  estates   and
educational,  religious and charitable organizations.  The Fund intends to limit
its investments to those that would  be permissible for national banks,  federal
savings institutions and federal credit unions.
 
This Prospectus briefly sets forth certain information about the Fund, including
applicable  operating expenses,  that prospective  investors should  know before
investing. Investors  are advised  to read  this Prospectus  and retain  it  for
future reference.
 
Additional  information about the  Fund, contained in  a Statement of Additional
Information dated the  same date  as this Prospectus,  has been  filed with  the
Securities  and Exchange  Commission (the 'SEC')  and is  available to investors
upon request and without charge by calling or writing the Trust at the telephone
number or  address listed  above.  The Statement  of Additional  Information  is
incorporated in its entirety by reference into this Prospectus.
 
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.
<PAGE>
--------------------------------------------------------------------------------
 
                                   FEE TABLE
 
The  table below  shows the  costs and  expenses that  an investor  would incur,
either directly or indirectly, as a  holder of Financial Intermediary shares  of
the  Fund,  based upon  an  estimate of  the  Fund's projected  annual operating
expenses. See 'Purchase  and Redemption  of Shares'  and 'General  Information.'
Shares  of the Fund  are sold without  imposition of any  sales charge, deferred
sales charge or any other transaction fee.
 
<TABLE>
<CAPTION>
                                                                                                    FINANCIAL
ANNUAL FUND OPERATING EXPENSES                                                                    INTERMEDIARY
(AS A PERCENTAGE OF AVERAGE NET ASSETS)*                                                             SHARES
-----------------------------------------------------------------------------------------   -------------------------
<S>                                                                                         <C>          <C>
Management Fee...........................................................................                    .45%
Other Expenses (after reimbursements)
     Shareholder Servicing Fees..........................................................        .25%
     Miscellaneous*......................................................................        .10%
          Total Other Expenses (after reimbursements)*...................................                    .35%
     Total Operating Expenses (after reimbursements)*....................................                    .80%
</TABLE>
 
   
     The nature of the services provided  to, and the aggregate management  fees
paid  by, the Fund are described below  under 'Management of the Fund.' Expenses
associated with  distributing  the  Fund's  shares  are  borne  by  the  Trust's
distributor out of its own resources and are not borne directly or indirectly by
shareholders.  For more complete descriptions of the various costs and expenses,
see 'Management of the  Fund.' The percentage of  'Other Expenses' in the  table
above  has been restated and is based on amounts expected to be incurred for the
current fiscal  year;  these expenses  include  fees for  shareholder  services,
custodial fees, legal and accounting fees, printing costs and registration fees,
the  costs  of regulatory  compliance, a  portion of  the costs  associated with
maintaining the Trust's legal existence and the costs involved in  communicating
with the Fund's shareholders.
    
 
     The  following example  demonstrates the  projected dollar  amount of total
cumulative expenses that would be incurred over various periods with respect  to
a  hypothetical $1,000 investment  in Financial Intermediary  shares of the Fund
assuming (1) a 5% annual return, (2) payment of annual total operating  expenses
set  forth in  the table  above and (3)  complete redemption  at the  end of the
period.
 
   
<TABLE>
<CAPTION>
EXAMPLE*                                                            1 YEAR    3 YEARS    5 YEARS    10 YEARS
-----------------------------------------------------------------   ------    -------    -------    --------
<S>                                                                 <C>       <C>        <C>        <C>
Financial Intermediary shares....................................     $8        $26        $44        $ 99
</TABLE>
    
 
   
     *The expense table and  the example reflect an  undertaking by the  Trust's
investment  adviser and administrator to reduce  or otherwise limit the expenses
of the Fund, on  an annualized basis,  to .80% of the  Fund's average daily  net
assets  in  respect of  Financial Intermediary  shares. In  the absence  of this
undertaking, which may be terminated at any time 'Miscellaneous Other Expenses,'
'Total Other Expenses' and  'Total Operating Expenses' would  be .24%, .49%  and
.94%, respectively. See 'Management of the Fund.'
    
     The  above  example  is intended  to  assist an  investor  in understanding
various costs  and  expenses  that  the investor  would  bear  upon  becoming  a
shareholder  of  the  Fund.  The  example  should  not  be  considered  to  be a
representation of past or  future expenses. Actual expenses  of the Fund may  be
greater  or less than those  shown above. The assumed  5% annual return shown in
the example is hypothetical and should not be considered to be a  representation
of past or future annual return; the actual return of the Fund may be greater or
less than the assumed return.
 
                                       2
<PAGE>
--------------------------------------------------------------------------------
 
                                   HIGHLIGHTS
 
<TABLE>
<S>              <C>        <C>
------------------------------------------------------------------------------------------------------------------
-------------------
The Trust
                            The Trust is an open-end management investment company. See 'General Information.'
------------------------------------------------------------------------------------------------------------------
-------------------
The Fund
                            The  Fund, the initial series  of the Trust, is  a diversified fund that  seeks to provide high
                            current income while limiting the degree of  fluctuation of its net asset value resulting  from
                            movements in interest rates. See 'Investment Objective and Policies' and 'General Information.'
------------------------------------------------------------------------------------------------------------------
-------------------
Benefits of
Investing
in the
Fund
                            Mutual  funds,  such  as  the  Fund,  are  flexible  investment  tools  that  are  increasingly
                            popular -- one of four American households now owns  shares of at least one mutual fund --  for
                            very sound reasons. The Fund offers investors the following important benefits:
 
                            Fund Designed For Institutions
                             Financial  Intermediary  shares  of the  Fund are  designed primarily  for institutions  as an
                             economical and convenient  means for  the investment  of short term  funds that  they hold  or
                             manage  for  others.  Financial intermediaries  may  include national  banks,  federal savings
                             institutions, federal credit  unions, corporations,  trust companies,  investment bankers  and
                             brokers,  insurance companies, investment counsellors,  pension funds, employee benefit plans,
                             law firms,  trusts,  estates and  educational,  religious and  charitable  organizations.  See
                             'Purchase and Redemption of Shares' and 'Management of the Fund -- Financial Intermediaries.'
 
                            Permissible Investment for Certain Depository Institutions
                             The  Fund  intends to  limit its investments to  those that would  be permissible for national
                             banks, federal savings institutions and federal credit unions.
 
                            Attractive Investment Alternative
                             The  Fund is designed for investors who desire (1) a higher yield than is generally  available
                             from  traditional fixed income investments that seek to maintain stable principal values, such
                             as bank money market deposit accounts, money  market mutual funds or certificates of  deposit,
                             (2) less fluctuation in net asset value than longer term fixed income funds and (3) the credit
                             safety  of  a portfolio  comprised  of Government  Securities.  During a  period  of declining
                             interest rates, however, the Fund's total return may be lower than that of a fund investing in
                             fixed rate longer term instruments  such as U.S. Treasury bonds.  In addition, the Fund's  net
                             asset  value can be expected to  experience greater volatility than the  value of a bank money
                             market deposit account, money  market mutual fund or  certificate of deposit. See  'Investment
                             Objective and Policies.'
</TABLE>
 
                                       3
 
<PAGE>
--------------------------------------------------------------------------------
   
<TABLE>
<S>              <C>        <C>
                            Adjustable Rate Securities
                             The  Fund invests at least 65% of its total assets in Adjustable Rate Securities, all of which
                             are also  Government Securities.  Unlike  fixed rate  securities, Adjustable  Rate  Securities
                             adjust  their rate  of interest to  general market  interest rate conditions,  subject in some
                             instances to certain limitations typically referred  to as 'caps' and 'floors.' Because  their
                             rates  of interest adjust at regular intervals,  Adjustable Rate Securities can be expected to
                             experience less volatility of principal than is generally inherent in securities with  similar
                             or longer terms that have fixed rates of interest.
 
                            High Quality Securities
                             The  Fund also  invests  100% of its assets  in Government Securities, many  of which are also
                             Adjustable Rate Securities.
 
                            Professional Management
                             By  pooling the monies of many investors, the Fund enables shareholders to obtain the benefits
                             of full-time professional management and an array of investments that is typically beyond  the
                             means of most investors. The Fund's investment adviser reviews the fundamental characteristics
                             of  far  more securities  than  can a  typical investor  and  may employ  portfolio management
                             techniques that frequently  are not used  by many institutional  investors. Additionally,  the
                             larger  denominations in which  the Fund invests may  result in better  overall prices for the
                             investment. See 'Management of the Fund.'
 
                            Transaction Savings
                             By  investing  in the  Fund,  an investor  is able  to  acquire ownership  in a  portfolio  of
                             securities  without paying the higher transaction costs  generally associated with a series of
                             small securities purchases.
 
                            Convenience
                             Fund  shareholders  are relieved  of  the administrative  and recordkeeping  burdens  normally
                             associated  with  direct  ownership of  securities.  Owners of  Financial  Intermediary shares
                             receive various services  from financial intermediaries  through which they  acquire and  hold
                             their shares. See 'Purchase and Redemption of Shares' and 'Management of the Fund -- Financial
                             Intermediaries.'
 
                            Liquidity
                             The  Fund's  convenient  purchase  and redemption  procedures provide  shareholders with ready
                             access to their money  and reduce the  delays frequently involved in  the direct purchase  and
                             sale of securities. See 'Purchase and Redemption of Shares.'
</TABLE>
    
 
                                       4
 
<PAGE>
--------------------------------------------------------------------------------
   
<TABLE>
<S>              <C>        <C>
                            Exchange Privilege
                             Holders  of Financial Intermediary  shares may exchange all  or a portion  of their shares for
                             Financial Intermediary shares  of any  of the  investment portfolios  of Liquid  Institutional
                             Reserves  to  the  extent  available through  the  shareholder's  financial  intermediary. See
                             'Purchase and Redemption of Shares -- Exchanges.'
------------------------------------------------------------------------------------------------------------------
-------------------
Purchase
and
Redemption
of Shares
                            Financial Intermediary shares of the  Fund may be purchased  and redeemed pursuant to  policies
                            and  procedures,  including  initial and  subsequent  investment minimums,  established  by the
                            participating financial intermediary. See 'Purchase and Redemption of Shares.'
------------------------------------------------------------------------------------------------------------------
-------------------
Management
Services
                            Mitchell Hutchins Asset  Management Inc.  ('Mitchell Hutchins'), a  wholly-owned subsidiary  of
                            PaineWebber Incorporated ('PaineWebber'), serves as investment adviser and administrator of the
                            Fund  and receives a  fee, accrued daily  and paid monthly, at  the annual rate  of .45% of the
                            Fund's average daily net assets. Mitchell Hutchins has undertaken to maintain the Fund's  total
                            annual  operating expenses at a level not exceeding .80% of the Fund's average daily net assets
                            annually for Financial Intermediary shares. This undertaking may be terminated at any time. See
                            'Management of the Fund.'
------------------------------------------------------------------------------------------------------------------
-------------------
Distributor
                            Mitchell Hutchins serves as the distributor of the Fund's shares.
------------------------------------------------------------------------------------------------------------------
-------------------
Dividends
                            Substantially all  of the  Fund's net  investment income  is declared  daily as  of 4:00  p.m.,
                            Eastern  time,  as  a  dividend  and  distributed  to  shareholders  monthly.  See  'Dividends,
                            Distributions and Taxes.'
------------------------------------------------------------------------------------------------------------------
-------------------
Risk Factors
and Special
Considera-
tions
                            No assurance can  be given  that the  Fund will achieve  its investment  objective. Changes  in
                            interest  rates generally  will result  in increases or  decreases in  the market  value of the
                            obligations held by the  Fund and, unlike  that of a  money market fund,  the Fund's net  asset
                            value per share will fluctuate. Certain of the instruments held by the Fund, and certain of the
                            investment techniques that the Fund may employ, might expose the Fund to certain risks, such as
                            mortgage-backed  securities  ('MBS') (which  include  adjustable rate  mortgage  securities and
                            collateralized mortgage obligations).  MBS are  subject to  prepayment or  early payout  risks,
                            which  are affected by changes in prevailing  interest rates and numerous economic, geographic,
                            social and other factors. The Fund's  reverse repurchase agreement transactions involve a  form
                            of  leverage.  The other  investment  techniques presenting  the  Fund with  risks  are lending
                            portfolio securities, entering into repurchase agreement transactions and purchasing securities
                            on a when-issued  or delayed delivery  basis. See  'Investment Objective and  Policies --  Risk
                            Factors and Special Considerations' at page 12.
</TABLE>
    
 
                                       5
<PAGE>
--------------------------------------------------------------------------------
 
                              FINANCIAL HIGHLIGHTS
 
   
The financial information for Financial Intermediary shares of the Fund has been
presented in the table below for the period from March 24, 1994 (commencement of
operations)  through November 30, 1994. This  information is supplemented by the
financial statements  and  accompanying notes  appearing  in the  Fund's  Annual
Report  to Shareholders for the  fiscal year ended November  30, 1994, which are
incorporated by  reference into  the Statement  of Additional  Information.  The
financial  statements  and  notes,  as  well as  the  information  in  the table
appearing below,  have  been  audited  by Deloitte  &  Touche  LLP,  independent
auditors, whose report thereon is included in the Annual Report to Shareholders.
Further  information about the performance  of the Fund is  also included in the
Annual Report to Shareholders, which may be obtained without charge.
    
 
   
<TABLE>
<CAPTION>
                                                                                                     MARCH 24, 1994*
                                                                                                           TO
                                                                                                    NOVEMBER 30, 1994
                                                                                                    -----------------
 
<S>                                                                                                 <C>
Net asset value, beginning of period.............................................................        $ 12.00
                                                                                                    -----------------
INCOME FROM INVESTMENT OPERATIONS
Net investment income............................................................................           0.37
Net realized and unrealized losses on investments................................................          (0.19)
                                                                                                    -----------------
Total from investment operations.................................................................           0.18
                                                                                                    -----------------
DISTRIBUTIONS TO SHAREHOLDERS FROM
Net investment income............................................................................          (0.37)
                                                                                                    -----------------
Net asset value, end of period...................................................................        $ 11.81
                                                                                                    -----------------
                                                                                                    -----------------
Total return (Annualized)#.......................................................................          2.00%
RATIOS/SUPPLEMENTAL DATA
Net assets, end of period (in thousands).........................................................        $13,131
RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
Expenses, net of reimbursement...................................................................          0.67%
Expenses, before reimbursement from manager......................................................          0.94%
Net investment income............................................................................          4.54%
PORTFOLIO TURNOVER RATE..........................................................................        170.25%
</TABLE>
    
 
* Commencement of Operations.
# Total return is calculated by giving  effect to the reinvestment of  dividends
  on the dividend payment date.
 
                                       6
 
<PAGE>
--------------------------------------------------------------------------------
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
INVESTMENT OBJECTIVE
 
The Fund's investment objective is to provide high current income while limiting
the  degree of fluctuation  of its net  asset value resulting  from movements in
interest rates. No assurance can be given that the Fund will be able to  achieve
its  investment objective,  which may  be changed  only with  the approval  of a
majority of the Fund's  outstanding voting securities, which  is defined in  the
Investment  Company Act of 1940,  as amended (the '1940  Act'), as the lesser of
(1) 67% or more of the shares present at a Fund meeting, if the holders of  more
than  50% of the  outstanding shares of  the Fund are  present or represented by
proxy or (2) more than 50% of the outstanding shares of the Fund.
 
TYPES OF PORTFOLIO INVESTMENTS
 
   
The Fund invests exclusively in  Government Securities and, under normal  market
conditions,  invests  at  least  65%  of its  total  assets  in  Adjustable Rate
Securities. The Fund may invest up to  35% of its net assets in securities  that
are  not  Adjustable Rate  Securities. The  Fund  may not  invest its  assets in
securities subject to legal or contractual restrictions on resale and securities
for which  no readily  available  market exists  or other  illiquid  securities,
including repurchase agreements having maturities of more than seven days.
    
 
   
     The Fund seeks to achieve low volatility of net asset value by investing in
a  diversified portfolio of  securities that Mitchell  Hutchins believes, in the
aggregate,  is  resistant  to  significant  fluctuations  in  market  value.  In
selecting  securities for the Fund, Mitchell Hutchins takes into account various
factors that will affect the volatility of  the Fund's assets, such as the  time
to the next coupon reset date for the securities, the payment characteristics of
the securities and the dollar weighted average life of the securities.
    
 
ADJUSTABLE RATE SECURITIES
 
   
Adjustable  Rate Securities  are instruments  that bear  interest at  rates that
adjust at  periodic intervals  at a  fixed amount  (typically referred  to as  a
'spread')  over the  market levels of  interest rates as  reflected in specified
indexes. The Adjustable Rate Securities in which the Fund invests consist of MBS
that are Government Securities. MBS  are securities that directly or  indirectly
represent  an interest in, or are backed by and are payable from, mortgage loans
secured by real property. MBS are issued in structured financings through  which
a  sponsor securitizes the  underlying mortgage loans  to liquify the underlying
assets or to achieve certain other financial goals.
    
 
     The interest paid on Adjustable Rate Securities and, therefore, the current
income earned by the Fund by investing  in them, is a function primarily of  the
indexes  upon which adjustments are based  and the applicable spread relating to
the securities. Examples of indexes  that may be used  are (1) one-, three-  and
five-year  U.S. Treasury securities  adjusted to a  constant maturity index, (2)
U.S. Treasury bills of three or six  months, (3) the daily Bank Prime Loan  Rate
made  available by the  Federal Reserve Board,  (4) the cost  of funds of member
institutions for the Federal Home Loan Bank of San Francisco and (5) the offered
quotations to  leading  banks in  the  London interbank  market  for  Eurodollar
deposits of a specified duration ('LIBOR').
 
                                       7
 
<PAGE>
--------------------------------------------------------------------------------
 
   
     The  interest  rates  paid  on  Adjustable  Rate  Securities  are generally
readjusted periodically to  an increment  over the chosen  interest rate  index.
Readjustments  occur at intervals ranging  from one to 60  months. The degree of
volatility in the market value of  the Adjustable Rate Securities in the  Fund's
portfolio  is  a  function  of  the  frequency  of  the  adjustment  period, the
applicable index and  the degree of  volatility in the  applicable index. It  is
also  a  function of  the  maximum increase  or  decrease of  the  interest rate
adjustment on any one adjustment date, in any one year and over the life of  the
securities.  These maximum increases and decreases  are typically referred to as
'caps' and 'floors,' respectively. The Fund does not seek to maintain an overall
average cap or  floor, although Mitchell  Hutchins considers caps  or floors  in
selecting Adjustable Rate Securities for the Fund.
    
 
   
     The  adjustable  interest  rate  feature  underlying  the  Adjustable  Rate
Securities in which the Fund invests generally acts as a buffer to reduce  sharp
changes  in  the Fund's  net asset  value  in response  to normal  interest rate
fluctuations. As the interest rates on  the mortgages underlying the Fund's  MBS
are   reset  periodically,  yields  of   portfolio  securities  gradually  align
themselves to reflect  changes in market  rates and should  cause the net  asset
value  of Financial Intermediary shares to fluctuate less dramatically than they
would if  the Fund  invested  in more  traditional  long-term, fixed  rate  debt
securities. During periods of rapidly rising interest rates, however, changes in
the  coupon rate may temporarily lag behind changes in the market rate, possibly
resulting in lower  net asset values  until the coupon  resets to market  rates.
Thus,  investors could suffer some  principal loss if they  sell their shares of
the Fund before the interest rates  on the underlying mortgages are adjusted  to
reflect current market rates.
    
 
   
     Unlike  fixed  rate  mortgages,  which generally  decline  in  value during
periods of rising interest rates, the Fund's adjustable rate MBS allow the  Fund
to  participate in increases  in interest rates  through periodic adjustments in
the coupons of the underlying mortgages, resulting in both higher current yields
and lower price fluctuations. In addition, if prepayments of principal are  made
on  the underlying mortgages  during periods of rising  interest rates, the Fund
generally is able to reinvest those amounts in securities with a higher  current
rate  of return. The Fund  does not benefit from  increases in interest rates to
the extent that interest rates rise to the point at which they cause the current
coupon of Adjustable Rate Securities to  exceed the maximum allowable caps.  The
Fund's  net  asset  values could  vary  to  the extent  that  current  yields on
Adjustable Rate  Securities  are different  from  market yields  during  interim
periods between the coupon reset dates.
    
 
   
     MBS.  The Fund limits its investments in  MBS to those issued or guaranteed
by the U.S. Government  or one of its  agencies or instrumentalities,  primarily
consisting  of securities either guaranteed  by the Government National Mortgage
Association ('GNMA')  or issued  by the  Federal National  Mortgage  Association
('FNMA') or the Federal Home Loan Mortgage Corporation ('FHLMC'). GNMA, FNMA and
FHLMC are agencies or instrumentalities of the U.S. Government and MBS issued or
guaranteed  by them are generally considered to  be of comparable quality to, or
higher than, privately issued securities rated Aaa by Moody's or AAA by Standard
& Poor's. GNMA MBS are guaranteed by GNMA and consist of pass-through  interests
in   pools   of   mortgage  loans   guaranteed   or  insured   by   agencies  or
instrumentalities of the United  States. FNMA and FHLMC  MBS are issued by  FNMA
and  FHLMC,  respectively, and  most often  represent pass-through  interests in
pools of similarly insured or guaranteed mortgage loans or pools of conventional
mortgage   loans   or   participations   in   the   pools.   GNMA,   FNMA    and
    
 
                                       8
 
<PAGE>
--------------------------------------------------------------------------------
   
FHLMC 'pass-through' MBS are so-named because they represent undivided interests
in  the  underlying mortgage  pools and  a proportionate  share of  both regular
interest and principal payments  (net of fees assessed  by GNMA, FNMA and  FHLMC
and   any  applicable  loan  servicing  fees),  as  well  as  unscheduled  early
prepayments on the underlying mortgage pool,  are passed through monthly to  the
holder of the MBS.
    
 
   
     Timely payment of principal and interest on GNMA MBS is guaranteed by GNMA,
a  wholly-owned  corporate instrumentality  of  the U.S.  Government  within the
Department of Housing and  Urban Development, which guarantee  is backed by  the
full  faith and credit of  the U.S. Government. FNMA,  a federally chartered and
privately owned corporation  organized and existing  under the Federal  National
Mortgage  Association Charter  Act, guarantees  timely payment  of principal and
interest on FNMA MBS. FHLMC, a corporate instrumentality of the U.S. Government,
guarantees (1) the timely payment of interest on all FHLMC MBS, (2) the ultimate
collection of  principal with  respect to  some  FHLMC MBS  and (3)  the  timely
payment of principal with respect to other FHLMC MBS. Neither the obligations of
FNMA  nor those of FHLMC are  backed by the full faith  and credit of the United
States. Nevertheless, because of the relationship  of each of these entities  to
the  United  States, MBS  issued by  them  are generally  considered to  be high
quality securities with minimal credit risk.
    
 
   
     Among the specific types of MBS in which the Fund may invest are adjustable
rate  mortgages   ('ARMs'),   which   are   pass-through   mortgage   securities
collateralized  by  mortgages  with  adjustable rather  than  fixed  rates. ARMs
eligible for inclusion in a mortgage pool generally provide for a fixed  initial
mortgage  interest  rate for  either  the first  three, six,  12,  13, 36  or 60
scheduled monthly  payments.  Thereafter,  the interest  rates  are  subject  to
periodic adjustment based on changes to a designated benchmark index.
    
 
   
     A  second  type of  MBS in  which  the Fund  may invest  are collateralized
mortgage obligations  ('CMOs'), which  are  debt obligations  collateralized  by
mortgage  loans or mortgage pass-through securities, issued by instrumentalities
of the U.S. Government. The Fund will not invest in privately issued CMOs.  Such
CMOs  are collateralized  by GNMA, FNMA  or FHLMC  certificates (this collateral
being referred  to  collectively  in  this  Prospectus  as  'Mortgage  Assets').
Multi-class  pass-through securities are equity interests in a trust composed of
Mortgage Assets. Payments of principal of  and interest on the Mortgage  Assets,
and  any reinvestment income  on the Mortgage  Assets, provide the  funds to pay
debt service on  the CMOs  or make  scheduled distributions  on the  multi-class
pass-through  securities. The issuer of a series of CMOs may elect to be treated
as a Real Estate Mortgage Investment Conduit.
    
 
     In a CMO, a series of bonds or certificates is issued in multiple  classes.
Each  class of CMOs, often  referred to as a 'tranche,'  is issued at a specific
fixed or floating coupon  rate and has a  stated maturity or final  distribution
date.  Principal prepayments  on the  Mortgage Assets may  cause the  CMOs to be
retired substantially earlier than their stated maturities or final distribution
dates. Interest is  paid or accrues  on all classes  of the CMOs  on a  monthly,
quarterly  or semi-annual basis.  The principal of and  interest on the Mortgage
Assets may be allocated among the several classes of a CMO series in a number of
different ways. Generally, the purpose of the  allocation of the cash flow of  a
CMO  to the  various classes is  to obtain a  more predictable cash  flow to the
individual tranches than exists with the underlying collateral of the CMO. As  a
 
                                       9
 
<PAGE>
--------------------------------------------------------------------------------
   
general  rule, the more predictable the cash flow is on a CMO tranche, the lower
the anticipated yield will be on that  tranche at the time of issuance  relative
to prevailing market yields on MBS.
    
 
     The  specific types  of CMOs the  Fund may  invest in include,  but are not
limited to, parallel pay CMOs and Planned Amortization Class CMOs ('PAC  Bonds')
issued  by  instrumentalities  of the  U.S.  Government. Parallel  pay  CMOs are
structured to provide payments  of principal on each  payment date to more  than
one class. These simultaneous payments are taken into account in calculating the
stated maturity date or final distribution date of each class, which, like other
CMO   structures,  must  be  retired  by  its  stated  maturity  date  or  final
distribution date but may  be retired earlier. PAC  Bonds are parallel pay  CMOs
that  generally  require payments  of a  specified amount  of principal  on each
payment date;  the required  principal payment  on PAC  Bonds have  the  highest
priority after interest has been paid to all classes.
 
OTHER INVESTMENTS OF THE FUND
 
   
     FIXED  RATE  MBS. Fixed  rate  MBS in  which  the Fund  may  invest consist
primarily of  fixed  rate pass-through  securities  and fixed  rate  CMOs.  Like
Adjustable  Rate  Securities, these  fixed rate  securities  may only  be issued
either by agencies or instrumentalities  of the U.S. Government. Similarly,  the
basic  structures with respect to fixed rate MBS are the same as those described
above with  respect  to Adjustable  Rate  Securities. The  principal  difference
between  fixed  rate  securities  and Adjustable  Rate  Securities  is  that the
interest rate on the former type of securities is set at a predetermined  amount
and does not vary according to changes in any index.
    
 
     GOVERNMENT  SECURITIES. The Fund  may invest in,  in addition to Government
Securities guaranteed by  GNMA and  issued by  FNMA and  FHLMC described  above,
other  Government  Securities such  as bills,  certificates of  indebtedness and
notes and bonds  issued or guaranteed  by the U.S.  Government, its agencies  or
instrumentalities.  Among the Government Securities that may be held by the Fund
are instruments that  are supported by  the full  faith and credit  of the  U.S.
Government;  instruments that are supported by the right of the issuer to borrow
from the U.S. Treasury; and instruments that are supported solely by the  credit
of the instrumentality.
 
     MONEY  MARKET INSTRUMENTS. Pending  the investment of  funds resulting from
the sale of Fund shares or the liquidation of portfolio holdings in longer  term
securities,  in order  to shorten the  Fund's average  portfolio maturity during
temporary defensive periods or in order  to have available highly liquid  assets
to  meet anticipated redemptions of  Fund shares or to  pay the Fund's operating
expenses, the Fund may invest in short-term Government Securities and repurchase
agreements with respect to those securities.
 
INVESTMENT TECHNIQUES AND STRATEGIES
 
The Fund, in seeking to meet  its investment objective, is authorized to  engage
in  any  one or  more of  the specialized  investment techniques  and strategies
described below:
 
     WHEN-ISSUED AND  DELAYED-DELIVERY SECURITIES.  To secure  prices or  yields
deemed  advantageous at a particular  time in an effort  to reduce interest rate
risk, the  Fund may  purchase securities  on a  when-issued or  delayed-delivery
basis,  in which case delivery  of and payment for  the securities occurs beyond
the  normal   settlement   period.  The   Fund   enters  into   when-issued   or
delayed-delivery  transactions for the  purpose of acquiring  securities and not
for the purpose of leverage or trading. When-issued securities purchased by  the
Fund may include securities
 
                                       10
 
<PAGE>
--------------------------------------------------------------------------------
purchased  on a 'when, as  and if issued' basis under  which the issuance of the
securities depends on the occurrence of a subsequent event, such as approval  of
a  merger,  corporate  reorganization  or  debt  restructuring.  The  Fund  will
establish with its custodian, or  with a designated sub-custodian, a  segregated
account  consisting of  cash, Government  Securities in  an amount  equal to the
amount of its when-issued or delayed-delivery purchase commitments.
 
   
     REPURCHASE  AGREEMENTS.  The  Fund  may  engage  in  repurchase   agreement
transactions  with respect  to instruments  in which  the Fund  is authorized to
invest. The Fund may  engage in repurchase  agreement transactions with  certain
member  banks of the Federal  Reserve System and with  certain dealers listed on
the Federal Reserve  Bank of  New York's list  of reporting  dealers. Under  the
terms  of a typical  repurchase agreement, the Fund  would acquire an underlying
debt obligation for a relatively short period (not more than seven days) subject
to an  obligation of  the seller  to repurchase,  and the  Fund to  resell,  the
obligation  at  an agreed-upon  price and  time,  thereby determining  the yield
during the Fund's holding period. Thus, repurchase agreements are considered  to
be collateralized loans. This arrangement results in a fixed rate of return that
is  not subject  to market  fluctuations during  the Fund's  holding period. The
value of  the  securities underlying  a  repurchase  agreement of  the  Fund  is
monitored  on an ongoing basis by Mitchell  Hutchins to ensure that the value is
at least equal at all  times to the total  amount of the repurchase  obligation,
including  interest. Mitchell  Hutchins also  monitors, on  an ongoing  basis to
evaluate potential risks, the creditworthiness  of those banks and dealers  with
which the Fund enters into repurchase agreements.
    
 
     REVERSE  REPURCHASE AGREEMENTS. The Fund  may enter into reverse repurchase
agreement transactions with certain member  banks of the Federal Reserve  System
and  with certain dealers listed on the  Federal Reserve Bank of New York's list
of reporting  dealers. A  reverse repurchase  agreement, which  is considered  a
borrowing  by the Fund, involves a sale by  the Fund of securities that it holds
concurrently with an agreement by the Fund to repurchase the same securities  at
an  agreed upon  price and date.  The Fund  typically invests the  proceeds of a
reverse repurchase agreement in  securities in which the  Fund is authorized  to
invest  or repurchase agreements relating to those securities maturing not later
than the expiration of the reverse repurchase agreement. This use of proceeds is
known as  leverage. The  Fund enters  into a  reverse repurchase  agreement  for
leverage purposes only when the interest income to be earned from the investment
of  the proceeds is  greater than the  interest expense of  the transaction. The
Fund may  also use  the proceeds  of reverse  repurchase agreements  to  provide
liquidity  to meet redemption requests when the sale of the Fund's securities is
considered to be disadvantageous. The  Fund will establish a segregated  account
with  its  custodian, or  a  designated sub-custodian,  in  which the  Fund will
maintain cash or Government  Securities equal in value  to its obligations  with
respect to reverse repurchase agreements.
 
     LENDING   PORTFOLIO  SECURITIES.  In  seeking  to  achieve  its  investment
objective and to hedge against the risk of interest rate fluctuations, the  Fund
may  lend securities guaranteed by the United States or by specified agencies of
the United States to well-known and recognized registered brokers or dealers and
banks insured  by  the Federal  Deposit  Insurance Corporation  ('FDIC').  These
loans,  if and when made, may  not exceed 33 1/3% of  the Fund's assets taken at
value. The Fund's loans of securities will be collateralized by cash, letters of
credit or Government  Securities. The  cash or  instruments collateralizing  the
Fund's  loans of  securities will  be maintained  at all  times in  a segregated
account with the Fund's custodian, or with a
 
                                       11
 
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designated sub-custodian, in  an amount  at least  equal to  the current  market
value of the loaned securities.
 
INVESTMENT RESTRICTIONS
 
The  Trust has adopted certain  fundamental investment restrictions with respect
to the Fund that may not be changed without approval of a majority of the Fund's
outstanding voting securities (as defined in the 1940 Act). Included among those
fundamental restrictions are the following:
 
          1. The  Fund  will  not purchase  securities  (other  than  Government
     Securities)  of any issuer if, as a result of the purchase, more than 5% of
     the value of the Fund's total assets would be invested in the securities of
     the issuer, except that up to 25%  of the value of the Fund's total  assets
     may be invested without regard to this 5% limitation.
 
          2.  The Fund will not purchase more  than 10% of the voting securities
     of any one  issuer, except that  this limitation is  not applicable to  the
     Fund's  investments in Government Securities, and up to 25% of the value of
     the Fund's  total  assets  may  be invested  without  regard  to  this  10%
     limitation.
 
          3.  The Fund will not issue  senior securities or borrow money, except
     that the  Fund  may  borrow  from banks  for  temporary,  extraordinary  or
     emergency purposes and enter into reverse repurchase agreements.
 
          4.  The  Fund will  not lend  money to  other persons,  except through
     purchasing  debt  obligations,  entering  into  repurchase  agreements  and
     lending  portfolio securities  in an  amount not to  exceed 33  1/3% of the
     value of the Fund's total assets.
 
          5. The Fund will  invest no more  than 25% of the  value of its  total
     assets  in  securities of  issuers in  any one  industry, except  that this
     limitation is  not  applicable  to  the  Fund's  investment  in  Government
     Securities.
 
     Notwithstanding  the foregoing  investment restrictions,  which are imposed
under the  1940 Act  and certain  state laws,  the Fund  invests exclusively  in
Government  Securities, repurchase agreements  and reverse repurchase agreements
with respect to those  securities and loans of  those securities. Certain  other
investment  restrictions  adopted by  the  Trust with  respect  to the  Fund are
described in the Statement of Additional Information.
 
RISK FACTORS AND SPECIAL CONSIDERATIONS
 
Investing in the Fund involves risks  and special considerations, such as  those
described below:
 
     INTEREST  RATE RISK. The Fund's portfolio is affected by general changes in
interest rates that will result in increases or decreases in the market value of
the obligations held by  the Fund. The  market value of  the obligations in  the
Fund's  portfolio can  be expected  to vary  inversely to  changes in prevailing
interest rates. Investors should  also recognize that,  in periods of  declining
interest  rates, the  Fund's yield tends  to be somewhat  higher than prevailing
market rates, and in periods of rising interest rates, the Fund's yield tends to
be somewhat lower. In addition, when interest rates are falling, money  received
by  the Fund  from the  continuous sale  of its  shares normally  is invested in
portfolio instruments producing lower yields than the balance of its  portfolio,
thereby  reducing the Fund's current yield. In periods of rising interest rates,
the opposite result can be expected to occur.
 
                                       12
 
<PAGE>
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     PREPAYMENT RISK. The  types of securities  in which the  Fund invests  have
certain  unique attributes  that warrant  special consideration  or that present
risks that may  not exist in  other types  of mutual fund  investments. Some  of
these   risks  and  special  considerations  are  peculiar  to  Adjustable  Rate
Securities whereas others, most notably the risk of prepayments, pertain to  the
characteristics of MBS generally.
    
 
   
     Payments  of principal of and interest on MBS are made more frequently than
are payments on conventional  debt securities. In addition,  holders of MBS  may
receive  unscheduled payments of principal  at any time representing prepayments
on the underlying mortgage loans. These  prepayments may usually be made by  the
related  obligor without  penalty. Prepayment rates  are affected  by changes in
prevailing interest rates  and numerous other  economic, geographic, social  and
other  factors including  changes in  mortgagors' housing  needs, job transfers,
unemployment, mortgagors' net equity in  the mortgaged properties and  servicing
decisions. Changes in the rate of prepayments will generally affect the yield to
maturity  of the security. Moreover, when the holder of the security attempts to
reinvest prepayments or even the  scheduled payments of principal and  interest,
it  may receive a rate of interest that is  higher or lower than the rate on the
MBS  originally  held.  Mortgage  foreclosures  and  principal  prepayments   on
securities  purchased by  the Fund at  a premium also  impose a risk  of loss of
principal because the premium may not have been fully amortized at the time  the
principal  is repaid  in full. If  MBS are  bought at a  discount, however, both
scheduled payments  of  principal  and  unscheduled  prepayments  will  increase
current  and total returns and will  accelerate the recognition of income which,
when distributed to shareholders, will  be taxable as ordinary income.  Mitchell
Hutchins will consider remaining maturities or estimated average lives of MBS in
selecting them for the Fund.
    
 
     ADJUSTABLE  RATE SECURITIES. The interest rate reset features of Adjustable
Rate Securities held by the Fund reduces  the effect on the net asset values  of
Fund  shares caused  by changes  in market interest  rates. The  market value of
Adjustable Rate Securities and, therefore, the Fund's net asset value,  however,
may vary to the extent that the current interest rates on the securities differs
from  market interest rates  during periods between  interest reset dates. These
variations in value occur  inversely to changes in  market interest rates. As  a
result,  if market interest rates rise above the current rate on the securities,
the value of the securities will decrease; conversely, if market interest  rates
fall  below the current rate on the securities, the value of the securities will
rise. If investors in the Fund sold their shares during periods of rising  rates
before  an adjustment occurred, those investors may suffer some loss. The longer
the adjustment intervals  on Adjustable Rate  Securities held by  the Fund,  the
greater the potential for fluctuations in the Fund's net asset value.
 
   
     Fund   shareholders  receive  increased  income   as  a  result  of  upward
adjustments of the interest rates on Adjustable Rate Securities held by the Fund
in response  to market  interest rates.  The Fund  and its  shareholders do  not
benefit,  however, from increases in market interest rates once those rates rise
to the point at which they cause the rates on the Adjustable Rate Securities  to
reach  their maximum adjustment rate, annual  or lifetime caps. Because of their
interest  rate  adjustment  feature,  Adjustable  Rate  Securities  are  not  an
effective  means of 'locking-in'  attractive rates for periods  in excess of the
adjustment period. In addition, mortgagors on loans underlying MBS with  respect
to  which  the underlying  mortgage assets  carry  no agency  or instrumentality
guarantee are often qualified for the loans on the basis of the original payment
    
 
                                       13
 
<PAGE>
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amounts; the mortgagor's income may not  be sufficient to enable it to  continue
making  its  loan payments  as  the payments  increase,  resulting in  a greater
likelihood of default.
 
     Any benefits  to the  Fund and  its shareholders  from an  increase in  the
Fund's  net asset values caused by declining market interest rates is reduced by
the potential for increased prepayments and a decline in the interest rates paid
on Adjustable  Rate Securities  held  by the  Fund.  When market  rates  decline
significantly,  the prepayment rate  on Adjustable Rate  Securities is likely to
increase  as  borrowers  refinance  with  fixed  rate  mortgage  loans,  thereby
decreasing  the capital appreciation potential of Adjustable Rate Securities. As
a result, the Fund  should not be  viewed as consistent  with any objectives  of
seeking capital appreciation.
 
     WHEN-ISSUED  AND  DELAYED-DELIVERY  SECURITIES. Securities  purchased  on a
when-issued or delayed-delivery basis  may expose the Fund  to risk because  the
securities  may experience fluctuations in value prior to their actual delivery.
The  Fund  will   not  accrue   income  with   respect  to   a  when-issued   or
delayed-delivery   security  prior  to  its  stated  delivery  date.  Purchasing
securities on a when-issued or delayed-delivery basis can involve the additional
risk that the yield available in the market when the delivery takes place may be
higher than that obtained in the transaction itself.
 
     REPURCHASE AGREEMENTS. In  entering into a  repurchase agreement, the  Fund
bears  a risk  of loss  in the  event that  the other  party to  the transaction
defaults on its obligations and the Fund is delayed or prevented from exercising
its rights to  dispose of  the underlying securities,  including the  risk of  a
possible  decline in the value of the underlying securities during the period in
which the  Fund seeks  to  assert its  rights to  them,  the risk  of  incurring
expenses  associated with asserting those rights and the risk of losing all or a
part of the income from the agreement.
 
     REVERSE REPURCHASE AGREEMENTS. A reverse repurchase agreement involves  the
risk  that the market value  of the securities retained  by the Fund may decline
below the  price  of the  securities  the Fund  has  sold but  is  obligated  to
repurchase  under the agreement.  In the event  the buyer of  securities under a
reverse repurchase  agreement files  for bankruptcy  or becomes  insolvent,  the
Fund's  use  of  the proceeds  of  the  agreement may  be  restricted  pending a
determination by the party, or its  trustee or receiver, whether to enforce  the
Fund's obligation to repurchase the securities.
 
     LENDING  PORTFOLIO SECURITIES. In lending  securities to registered brokers
or dealers and FDIC insured banks, the Fund may be subject to risks, which, like
those associated  with other  extensions  of credit,  include possible  loss  of
rights in the collateral should the borrower fail financially.
 
PORTFOLIO TURNOVER
 
   
The  Fund's portfolio is  actively managed. The portfolio  turnover rate for the
period March 24, 1994 through November 30, 1994 was 170.25%. Portfolio  turnover
may  vary greatly  from year  to year  and will  not be  a limiting  factor when
Mitchell Hutchins deems  portfolio changes appropriate.  A higher turnover  rate
(100%  or more)  will involve  correspondingly greater  transaction costs, which
will be  borne  directly  by  the  Fund, and  may  increase  the  potential  for
short-term  capital gains. Short-term gains realized from portfolio transactions
are taxable to  shareholders as ordinary  income. See 'Dividends,  Distributions
and Taxes -- Taxes.'
    
 
                                       14
 
<PAGE>
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                             MANAGEMENT OF THE FUND
 
TRUSTEES AND OFFICERS
 
The  business and  affairs of the  Fund are  managed under the  direction of the
Trust's Board  of  Trustees, and  the  day-to-day  operations of  the  Fund  are
conducted through or under the direction of officers of the Trust. The Statement
of Additional Information contains general background information regarding each
Trustee and officer of the Trust.
 
   
    
   
INVESTMENT ADVISER AND ADMINISTRATOR
    
 
   
Mitchell Hutchins, 1285 Avenue of the Americas, New York, New York 10019, serves
as  the  Fund's investment  adviser and  administrator.  Mitchell Hutchins  is a
wholly owned subsidiary of PaineWebber, which  in turn is wholly owned by  Paine
Webber  Group Inc.  ('PW Group'),  a publicly  owned financial  services holding
company.  Mitchell  Hutchins,  organized  in  May  1977,  is  registered  as  an
investment  adviser under the Investment  Advisers Act of 1940  and as a broker-
dealer under  the Securities  Exchange Act  of 1934.  As of  February 28,  1995,
Mitchell  Hutchins or PaineWebber served as investment adviser or sub-adviser to
42 investment  companies with  an  aggregate of  77 separate  portfolios  having
aggregate assets of over $26.8 billion.
    
 
   
     As  a result of an asset purchase  transaction by and among Kidder, Peabody
Group Inc., its parent, General Electric  Company, and PW Group, the  investment
advisory  services provided to the Fund by Kidder Peabody Asset Management, Inc.
('KPAM'), the Fund's predecessor manager  and investment adviser, were  assumed,
on  an interim basis,  by Mitchell Hutchins  as of February  13, 1995. After the
interim period, and subject to shareholder approval, which is expected to  occur
on  or  about  March  31,  1995, Mitchell  Hutchins  will  serve  as  the Fund's
investment adviser and administrator. During the interim period and  thereafter,
assuming  shareholder approval, the Fund has agreed to pay Mitchell Hutchins the
same fee  for investment  advisory  and administrative  services that  the  Fund
agreed  to pay KPAM for  such services. No assurance  can be made that requisite
shareholder approval of these arrangements will be obtained.
    
 
   
     As the  Fund's investment  adviser  and administrator,  Mitchell  Hutchins,
subject  to the supervision and  direction of the Trust's  Board of Trustees, is
generally responsible for furnishing,  or causing to be  furnished to the  Fund,
investment  advisory  and  management  services.  Included  among  the  specific
services provided by Mitchell Hutchins as administrator are: the maintenance and
furnishing of all  required records  or reports pertaining  to the  Fund to  the
extent  those records or reports  are not maintained or  furnished by the Fund's
transfer agent, custodian or other agents employed by the Fund; the providing of
general administrative services to the Fund not otherwise provided by the Fund's
transfer agent, custodian or other agents employed by the Fund; and the  payment
of  reasonable  salaries  and  expenses  of those  of  the  Fund's  officers and
employees, and the fees and  expenses of those members  of the Trust's Board  of
Trustees, who are directors, officers or employees of Mitchell Hutchins.
    
 
   
     As  the  Fund's  investment  adviser,  Mitchell  Hutchins,  subject  to the
supervision and direction of the Trust's  Board of Trustees, manages the  Fund's
portfolio in accordance with the investment objective and stated policies of the
Fund,  makes  investment decisions  for the  Fund and  places purchase  and sale
orders for the  Fund's portfolio transactions.  Mitchell Hutchins also  provides
the Fund with investment officers who are authorized by the Board of Trustees to
    
 
                                       15
 
<PAGE>
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execute  purchases and sales of  securities on behalf of  the Fund and employs a
professional staff of portfolio managers who draw upon a variety of sources  for
research information for the Fund.
 
   
    
   
Dennis  L. McCauley and Nirmal Singh  are jointly responsible for the day-to-day
management of the Fund. Mr. McCauley is a Managing Director and Chief Investment
Officer --  Fixed Income  of Mitchell  Hutchins responsible  for overseeing  all
active  fixed  income investments,  including  domestic and  global  taxable and
tax-exempt mutual  funds.  Prior  to  joining Mitchell  Hutchins  in  1994,  Mr.
McCauley  worked  for IBM  Corporation  where he  was  Director of  Fixed Income
Investments responsible for developing and managing investment strategy for  all
fixed  income and  cash management investments  of IBM's pension  fund and self-
insured medical funds.  Mr. McCauley has  also served as  Vice President of  IBM
Credit Corporation's mutual funds and a member of the Retirement Fund Investment
Committee.
    
 
   
     Nirmal  Singh  is a  Vice President  of  Mitchell Hutchins  responsible for
overseeing investments  in  the  mortgage-backed securities  section.  Prior  to
joining  Mitchell Hutchins  in 1993,  Mr. Singh  worked for  Merrill Lynch Asset
Management where he was  a member of the  portfolio management team  responsible
for  several diversified funds, including mortgage-backed securities funds, with
assets totalling $8  billion. Mr.  Singh has also  held the  position of  Senior
Portfolio  Manager at Nomura  Mortgage Funds Management and  prior to Nomura, he
worked as a transactions strategist at Shearson Lehman Brothers Inc. and for two
years at the Federal National Mortgage Association.
    
 
   
     The Trust pays Mitchell Hutchins for its services as investment adviser and
administrator to the Fund a  fee that is accrued daily  and paid monthly at  the
annual  rate of .45% of  the Fund's average daily  net assets. Mitchell Hutchins
has undertaken to  reduce or otherwise  limit the  expenses of the  Fund, on  an
annualized  basis, to .80% of the Fund's  average daily net assets in respect of
Financial Intermediary shares.  This undertaking may  be terminated by  Mitchell
Hutchins  at  any time  in  its sole  discretion.  From time  to  time, Mitchell
Hutchins in its sole  discretion may waive  all or a portion  of its fee  and/or
reimburse all or a portion of the Fund's operating expenses.
    
 
   
     Although  investment  decisions for  the Fund  are made  independently from
those of the  other accounts managed  by Mitchell Hutchins,  investments of  the
type  the Fund may make may also be  made by those other accounts. When the Fund
and one or  more other  accounts managed by  Mitchell Hutchins  are prepared  to
invest  in, or desire to dispose of, the same security, available investments or
opportunities for sales are allocated in a manner believed by Mitchell  Hutchins
to  be equitable to each. In some cases, this procedure may adversely affect the
price paid or  received by  the Fund  or the size  of the  position obtained  or
disposed of by the Fund.
    
 
FINANCIAL INTERMEDIARIES
 
Financial  intermediaries, such as banks and  savings and loan associations, may
purchase Financial  Intermediary shares  for the  accounts of  their  customers.
Beneficial  owners  of Financial  Intermediary  shares receive  certain services
directly from financial  intermediaries, bear the  service fees described  below
and  enjoy certain exclusive voting rights on matters relating to these services
and fees. The  Trust will  enter into a  service agreement  with each  financial
intermediary  that  purchases  Financial  Intermediary  shares  requiring  it to
provide support  services to  its customers  who are  the beneficial  owners  of
Financial Intermediary shares in consideration of the
 
                                       16
 
<PAGE>
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Trust's  payment of .25%, on an annualized basis, of the average daily net asset
value of the Financial  Intermediary shares held  by the financial  intermediary
for the benefit of its customers. These services, which are described in greater
detail  in  the Statement  of Additional  Information  under 'Management  of the
Fund -- Financial Intermediaries,' include: aggregating and processing  purchase
and  redemption requests from customers and  placing net purchase and redemption
orders with PaineWebber;  providing customers  with a service  that invests  the
assets  of their accounts in  Financial Intermediary shares; processing dividend
payments on behalf of customers; providing information periodically to customers
showing their positions  in Financial  Intermediary shares;  arranging for  bank
wires;  responding to customer  inquiries relating to  the services performed by
the financial intermediary; providing  sub-accounting with respect to  Financial
Intermediary shares beneficially owned by customers or the information necessary
for  sub-accounting;  forwarding  shareholder communications  from  the  Fund to
customers, if required by law; and such other similar services as the Trust  may
reasonably request from time to time to the extent the financial intermediary is
permitted  to do  so under  federal and  state statutes,  rules and regulations.
Under the terms of the service agreements, financial intermediaries are required
to provide to their customers  a schedule of any  additional fees that they  may
charge  customers in connection with their investments in Financial Intermediary
shares. Financial Intermediary  shares will  be available for  purchase only  by
financial  intermediaries  that have  entered into  service agreements  with the
Trust in connection  with their investment.  Financial intermediaries  providing
services to beneficial owners of Financial Intermediary shares in certain states
may be required to be registered as dealers under the laws of those states.
    
 
     Should  future legislative,  judicial or administrative  action prohibit or
restrict  the  activities  of  banks  serving  as  financial  intermediaries  in
connection  with the provision of support services to their customers, the Trust
might be  required  to alter  or  discontinue its  arrangements  with  financial
intermediaries  and change  its method of  operations with  respect to Financial
Intermediary shares. It  is not  anticipated, however,  that any  change in  the
Trust's  method of operations would affect the  Fund's net asset value per share
with respect to Financial Intermediary shares  or result in a financial loss  to
any shareholder.
 
                       PURCHASE AND REDEMPTION OF SHARES
 
   
Mitchell Hutchins is the distributor of the Trust's shares. The Fund's Financial
Intermediary  shares are  available for  purchase by  banks and  other financial
intermediaries for the benefit of their  customers and bear all fees payable  by
the  Fund to financial  intermediaries for certain services  they provide to the
beneficial owners  of  these  shares.  Financial  Intermediary  shares  must  be
purchased,   maintained  and  redeemed  pursuant  to  policies  and  procedures,
including  initial   and   subsequent  investment   minimums,   established   by
participating  financial  intermediaries.  Shareholder  inquiries  regarding the
Trust may be made through a participating financial intermediary.
    
 
   
     Purchase orders  for Financial  Intermediary shares  of the  Fund that  are
received  prior to the close  of regular trading on  the New York Stock Exchange
(the 'NYSE') on a particular day (currently 4:00 p.m., Eastern time) are  priced
according  to  the  net asset  value  determined  on that  day.  Purchase orders
received after the close  of regular trading  on the NYSE are  priced as of  the
time  net asset value  per share is  next determined. See  'Determination of Net
Asset Value' below for a description of  the times at which net asset value  per
share is determined.
    
 
                                       17
 
<PAGE>
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     In  order  to  maximize  earnings,  the Fund  attempts  to  be  invested as
completely as practicable and is normally required to make settlement in Federal
funds for securities purchased. Accordingly, payment for Financial  Intermediary
shares  is  not  effective  until  received in  or  converted  to  Federal funds
immediately available to the Trust. The Trust and Mitchell Hutchins each reserve
the right to reject any purchase order for any reason.
    
 
   
     Shares are redeemed at the net asset value per share next determined  after
Mitchell  Hutchins receipt of the redemption  order. Payment for redeemed shares
for which a redemption order is received by Mitchell Hutchins before 4:00  p.m.,
Eastern  time,  is  normally  made  in  Federal  funds  wired  to  the redeeming
shareholder's financial  intermediary on  the next  business day  following  the
redemption.
    
 
EXCHANGES
 
Financial  Intermediary  shares  of  the Fund  may  be  exchanged  for Financial
Intermediary shares of  the Money  Market Fund, Government  Securities Fund  and
Treasury  Securities  Fund, all  of which  are  investment portfolios  of Liquid
Institutional Reserves,  to  the  extent  available  through  the  shareholder's
financial  intermediary, at  the net asset  value next  determined. The exchange
privilege may be modified or terminated in accordance with the rules of the  SEC
and  is available to shareholders resident in any state in which the fund shares
being acquired legally may be sold.
 
   
    
OTHER MATTERS
 
   
The Fund may suspend  the right of  redemption or postpone  the date of  payment
upon redemption (as well as suspend or postpone the recording of the transfer of
its  shares) for such periods as permitted under the 1940 Act. The Fund may also
redeem shares involuntarily under certain special circumstances described in the
Statement of Additional Information under 'Purchase and Redemption of Shares.'
    
 
   
     Financial Intermediary shares are sold  and redeemed without charge by  the
Fund,  although financial intermediaries purchasing  or holding shares for their
customer accounts may charge  customers for cash  management and other  services
provided  in  connection with  their accounts  including, for  instance, account
maintenance fees, compensating  balance requirements  or fees  based on  account
transactions,  assets or  income. Further,  the dividends  payable to beneficial
owners of Financial Intermediary shares are  reduced in respect of fees paid  by
the  Fund to financial  intermediaries through which  those shares are purchased
and held. See 'Management of the  Fund -- Financial Intermediaries.' A  customer
should  consider the terms of  his or her account  with a financial intermediary
before purchasing  shares.  A  financial intermediary  purchasing  or  redeeming
shares  on behalf  of its  customers is  responsible for  transmitting orders to
PaineWebber in accordance with its customer agreements.
    
 
                        DETERMINATION OF NET ASSET VALUE
 
Net asset  value per  Financial Intermediary  share is  calculated by  Investors
Fiduciary  Trust Company  ('IFTC'), the  Fund's custodian,  on each  day, Monday
through Friday,  except  on days  on  which the  NYSE  is closed.  The  NYSE  is
currently  scheduled  to be  closed  on New  Year's  Day, Presidents'  Day, Good
Friday,  Memorial   Day,  Independence   Day,   Labor  Day,   Thanksgiving   and
 
                                       18
 
<PAGE>
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Christmas,  and on the  preceding Friday when  one of those  holidays falls on a
Saturday or on  the subsequent  Monday when  one of  those holidays  falls on  a
Sunday.
 
     Net  asset value per Financial Intermediary  share of a class is determined
as of the close of regular trading on the NYSE, and is computed by dividing  the
value  of the Fund's net assets attributable to Financial Intermediary shares by
the total number  of Financial Intermediary  shares outstanding. Generally,  the
Fund's  investments are valued  at market value  or, in the  absence of a market
value, at fair  value as determined  by or  under the direction  of the  Trust's
Board of Trustees.
 
     Investments   in   Government  Securities   and  other   securities  traded
over-the-counter, other than short-term  investments that mature  in 60 days  or
less,  are valued  at the  average of  the quoted  bid and  asked prices  in the
over-the-counter market. Short-term investments that  mature in 60 days or  less
are  valued on the basis of amortized cost (which involves valuing an investment
at its cost and, thereafter, assuming a constant amortization to maturity of any
discount or premium, regardless of the  effect of fluctuating interest rates  on
the  market value of the  investment) when the Board  of Trustees has determined
that amortized cost represents fair value.  A security that is primarily  traded
on  a stock exchange is valued at the last sale price on that exchange or, if no
sales occurred during the day, at the current quoted bid price.
 
     In carrying out the  Board's valuation policies, IFTC  may consult with  an
independent pricing service retained by the Trust. Further information regarding
the  Fund's  valuation  policies is  contained  in the  Statement  of Additional
Information.
 
                       DIVIDENDS, DISTRIBUTIONS AND TAXES
 
DIVIDENDS AND DISTRIBUTIONS
 
   
Dividends from  net  investment  income  of the  Fund  are  declared  daily  and
distributed monthly and distributions of net realized capital gains of the Fund,
if  any, are  declared and distributed  at least annually.  Unless a shareholder
instructs the Fund that dividends and capital gain distributions should be  paid
in  cash and credited to the  shareholder's Account, dividends and capital gains
distributions are  reinvested automatically  at net  asset value  in  additional
Financial  Intermediary shares. The Fund is subject to a 4% nondeductible excise
tax measured with  respect to  certain undistributed amounts  of net  investment
income  and capital gains. If necessary to avoid the imposition of this tax, and
if in the  best interests of  its shareholders,  the Fund will  declare and  pay
dividends  of its  net investment  income and  distributions of  its net capital
gains more frequently than stated above.
    
 
     Shares of the Fund begin earning dividends  on the day on which the  shares
are issued, the date of issuance customarily being the settlement date, which is
the  date on which the Fund receives  payment for the shares. Shares continue to
earn dividends until the day prior to the settlement date of a redemption.
 
TAXES
 
   
The Trust intends that  the Fund continue  to qualify each  year as a  regulated
investment  company within the meaning of the  Internal Revenue Code of 1986, as
amended. To qualify  as a regulated  investment company for  federal income  tax
purposes, the Fund limits its income and
    
 
                                       19
 
<PAGE>
--------------------------------------------------------------------------------
investments  so that (1) less  than 30% of its gross  income is derived from the
sale  or  disposition  of  stocks,   other  securities  and  certain   financial
instruments  (including certain forward contracts) that  were held for less than
three months and (2) at  the close of each quarter  of the taxable year (a)  not
more  than 25% of the market value of the Fund's total assets is invested in the
securities (other than Government  Securities) of a single  issuer or of two  or
more  issuers controlled  by the Fund  that are  engaged in the  same or similar
trades or businesses or in related trades or businesses and (b) at least 50%  of
the  market value of the Fund's total assets is represented by (i) cash and cash
items, (ii) Government Securities and (iii) other securities limited in  respect
of  any one issuer to an amount not greater in value than 5% of the market value
of the Fund's total assets  and to not more than  10% of the outstanding  voting
securities  of the issuer. The requirements for qualification may cause the Fund
to restrict the degree to which it sells or otherwise disposes of securities and
certain financial  instruments held  for less  than three  months. If  the  Fund
qualifies  as  a regulated  investment  company and  meets  certain distribution
requirements, the Fund  will not be  subject to  federal income tax  on its  net
investment  income and  net realized  capital gains  that it  distributes to its
shareholders.
 
     Dividends paid by the Fund out  of net investment income and  distributions
of  net realized  short-term capital  gains will  be taxable  to shareholders as
ordinary income,  whether received  in  cash or  reinvested in  additional  Fund
shares. Distributions of net realized long-term capital gains will be taxable to
shareholders as long-term capital gain, regardless of how long shareholders have
held  their  shares  and  whether  the distributions  are  received  in  cash or
reinvested in additional shares.  Dividends and distributions  paid by the  Fund
will  generally not  qualify for  the federal  dividends received  deduction for
corporate shareholders.
 
   
     Statements as to the  tax status of each  Fund shareholder's dividends  and
distributions  will  be  mailed  annually. Shareholders  will  also  receive, as
appropriate, various  written  notices  regarding  the  tax  status  of  certain
dividends  and distributions that were paid (or  that are treated as having been
paid) by  the Fund  to  its shareholders  during  the preceding  calendar  year,
including   the  amount  of  dividends  that  represent  interest  derived  from
Government Securities.
    
 
     Shareholders  are  urged  to  consult  their  tax  advisors  regarding  the
application  of federal,  state, local  and foreign  tax laws  to their specific
situations before investing in the Fund.
 
                            PERFORMANCE INFORMATION
 
From time to  time, the Trust  may advertise  the 30-day 'yield'  of the  Fund's
Financial  Intremediary shares. The  yield refers to the  income generated by an
investment in Financial Intermediary shares over the 30-day period identified in
the advertisement and  is computed  by dividing  the net  investment income  per
share  earned by the Financial Intermediary shares  during the period by the net
asset value per share of  the Financial Intermediary shares  on the last day  of
the period. This income is 'annualized' by assuming that the amount of income is
generated each month over a one-year period and is compounded semi-annually. The
annualized income is then shown as a percentage of the net asset value.
 
     From time to time, the Trust may advertise the Fund's 'average annual total
return'  over various periods  of time for  Financial Intermediary shares. Total
return figures, which are based on  historical earnings and are not intended  to
indicate  future performance, show the average  percentage change in value of an
investment in  Financial  Intermediary  shares  from the  beginning  date  of  a
measuring period to the end of that period. These figures reflect changes in the
price of
 
                                       20
 
<PAGE>
--------------------------------------------------------------------------------
shares  and assume that any income  dividends and/or capital gains distributions
made by the  Fund during the  period were reinvested  in Financial  Intermediary
shares.  Total  return  figures will  be  given  for the  most  recent  one- and
five-year periods, or for  the life of the  Fund to the extent  that it has  not
been  in existence for  the full length of  those periods, and  may be given for
other periods as well, such as on a year-by-year basis. The average annual total
return for any one  year in a period  longer than one year  might be greater  or
less than the average for the entire period.
 
     The  Trust  may  quote 'aggregate  total  return' figures  with  respect to
Financial Intermediary shares for  various periods, representing the  cumulative
change  in value of an investment for the specific period and reflecting changes
in share  prices  and  assuming reinvestment  of  dividends  and  distributions.
Aggregate total return may be shown by means of schedules, charts or graphs, and
may  indicate  subtotals of  the various  components of  total return  (that is,
changes in  value of  initial  investment, income  dividends and  capital  gains
distributions).  Reflecting compounding over a  longer period of time, aggregate
total return data  generally will  be higher  than average  annual total  return
data.
 
     The  Trust may, in  addition to quoting  the Financial Intermediary shares'
average  annual  and  aggregate  total  returns,  advertise  actual  annual  and
annualized  total return  performance data for  various periods  of time. Actual
annual and annualized total returns may  be shown by means of schedules,  charts
or graphs. Actual annual or annualized total return data generally will be lower
than average annual total return data, which reflects compounding of return.
 
     In  reports or other communications to Fund shareholders and in advertising
material, the Trust may compare  the Financial Intermediary shares'  performance
with  the performance  of other mutual  funds (or analogous  classes thereof) as
listed in rankings prepared by  Lipper Analytical Services Inc., CDA  Investment
Technologies,  Inc. or similar investment  services that monitor the performance
of mutual funds or as set  out in the nationally recognized publications  listed
below.  The  Trust  may  also include  in  communications  to  Fund shareholders
evaluations of the Fund published by nationally recognized ranking services  and
by  financial  publications that  are nationally  recognized, such  as Barron's,
Business Week,  Forbes, Institutional  Investor, Investor's  Daily,  Kiplinger's
Personal  Finance Magazine, Morningstar Mutual Fund  Values, Money, The New York
Times, USA Today and The Wall  Street Journal. Any given performance  comparison
should not be considered as representative of the Financial Intermediary shares'
performance for any future period.
 
                              GENERAL INFORMATION
 
ORGANIZATION OF THE TRUST
 
The  Trust is registered under the 1940 Act as an open-end management investment
company and was formed as a business  trust pursuant to a Declaration of  Trust,
as  amended  from  time to  time  (the  'Declaration'), under  the  laws  of The
Commonwealth of Massachusetts on October 14, 1993. The Fund commenced operations
on March 24, 1994. The Declaration  authorizes the Trust's Board of Trustees  to
create separate series, and within each series separate classes, of an unlimited
number  of shares of  beneficial interest, par  value $.001 per  share. The Fund
offers two  separate classes  of shares  -- Institutional  shares and  Financial
Intermediary shares. Shares of each class represent equal, pro rata interests in
the  Fund and bear expenses and accrue daily dividends in the same manner except
that  Institutional  shares   do  not  bear   fees  payable  by   the  Fund   to
 
                                       21
 
<PAGE>
--------------------------------------------------------------------------------
   
financial  intermediaries. Mitchell Hutchins has agreed to limit the expenses of
the Fund, on an annualized basis, to .55% of the Fund's average daily net  asset
value  in respect of Institutional shares. PaineWebber Investment Executives and
other persons remunerated on the basis of sales of shares may receive  different
levels of compensation for selling one class of shares over another.
    
 
     When  issued, Fund  shares are  fully paid  and non-assessable.  Shares are
freely transferable and have no pre-emptive, subscription or conversion  rights.
Each  class represents an identical interest in the Fund's investment portfolio.
As a  result, the  classes have  the same  rights, privileges  and  preferences,
except  with respect  to: (1)  the designation of  each class;  (2) the expenses
allocable exclusively to each  class; (3) voting  rights on matters  exclusively
affecting  a single  class; and  (4) the exchange  privilege of  each class. The
Board of Trustees does not anticipate that there will be any conflicts among the
interests of the holders of the  different classes. The Trustees, on an  ongoing
basis,  will consider whether  any conflict exists and,  if so, take appropriate
action. Certain  aspects of  the shares  may  be changed,  upon notice  to  Fund
shareholders,  to satisfy certain tax regulatory  requirements, if the change is
deemed necessary by the Trust's Board of Trustees.
 
     Shareholders of the Fund are entitled to one vote for each full share  held
and  fractional  votes  for  fractional  shares  held.  Voting  rights  are  not
cumulative and, as  a result,  the holders  of more  than 50%  of the  aggregate
shares  of the  Trust may elect  all of  the Trustees. Generally,  shares of the
Trust will be voted on a Trust-wide basis on all matters except those  affecting
only  the  interests  of one  series,  such  as the  Fund's  investment advisory
agreement. In turn, shares of the Fund will be voted on a Fund-wide basis on all
matters except those  affecting only  the interests of  one class,  such as  the
shareholder servicing arrangements relating to Financial Intermediary shares.
 
     The  Trust  intends to  hold  no annual  meetings  of shareholders  for the
purpose of  electing  Trustees unless,  and  until such  time  as, less  than  a
majority  of  the Trustees  holding office  have  been elected  by shareholders.
Shareholders of record of no less  than two-thirds of the outstanding shares  of
the  Trust may remove a Trustee through a declaration in writing or by vote cast
in person or by proxy  at a meeting called for  that purpose. A meeting will  be
called  for the  purpose of voting  on the removal  of a Trustee  at the written
request of holders of 10% of the Trust's outstanding shares. Shareholders of the
Fund who satisfy certain criteria will be assisted by the Trust in communicating
with other shareholders in seeking the holding of the meeting.
 
REPORTS TO SHAREHOLDERS
 
The Trust sends Fund shareholders semi-annual and annual reports, each of  which
includes  a list of the investment securities held  by the Fund as of the end of
the period covered by the report.
 
                        CUSTODIAN AND TRANSFER, DIVIDEND
                            AND RECORDKEEPING AGENT
 
   
IFTC, located at 127  West 10th Street, Kansas  City, Missouri 64105, serves  as
the Fund's custodian. PFPC Inc., a subsidiary of PNC Bank, National Association,
whose  principal address  is 400  Bellevue Parkway,  Wilmington, Delaware 19809,
serves as the Fund's transfer, dividend and recordkeeping agent.
    
 
                                       22
 
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<PAGE>
   No person has been authorized to give any information or to make any
   representations not contained in this Prospectus, or in the
   Statement of Additional Information incorporated into this
   Prospectus by reference, in connection with the offering made by
   this Prospectus and, if given or made, any such information or
   representations must not be relied upon as having been authorized by
   the Fund or its distributor. This Prospectus does not constitute an
   offering by the Fund or by its distributor in any jurisdiction in
   which the offering may not lawfully be made.
   
 
<TABLE>
<S>                                            <C>
---------------------------------------------------
CONTENTS
---------------------------------------------------
Fee Table                                              2
---------------------------------------------------
Highlights                                             3
---------------------------------------------------
Financial Highlights                                   6
---------------------------------------------------
Investment Objective and Policies                      7
---------------------------------------------------
Management of the Fund                                15
---------------------------------------------------
Purchase and Redemption of Shares                     17
---------------------------------------------------
Determination of Net Asset Value                      18
---------------------------------------------------
Dividends, Distributions and Taxes                    19
---------------------------------------------------
Performance Information                               20
---------------------------------------------------
General Information                                   21
---------------------------------------------------
Custodian and Transfer, Dividend
  and Recordkeeping Agent                             22
---------------------------------------------------
</TABLE>
 

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

    
   
<TABLE>
<S>                           <C>
                               INSTITUTIONAL
                                  ADJUSTABLE
                                        RATE
                                  GOVERNMENT
                                   PORTFOLIO
 
                              PROSPECTUS
 
                              MARCH 28, 1995
 
                              FINANCIAL INTERMEDIARY SHARES
</TABLE>
    
 
                                                              ------------------
<PAGE>
   
Statement of Additional Information                               March 28, 1995
--------------------------------------------------------------------------------
    
               INSTITUTIONAL ADJUSTABLE RATE GOVERNMENT PORTFOLIO
   
    1285 AVENUE OF THE AMERICAS   NEW YORK, NEW YORK 10019   (800) 543-3373
    
 
   
This  Statement of Additional Information  supplements the information contained
in the  Prospectuses dated  March  28, 1995,  of Institutional  Adjustable  Rate
Government  Portfolio (the 'Fund'), a series  of Institutional Series Trust (the
'Trust'). The  Fund seeks  to provide  high current  income while  limiting  the
degree  of  fluctuation  of its  net  asset  value resulting  from  movements in
interest rates. The Fund seeks to achieve this objective by investing  primarily
in  adjustable  rate securities  ('Adjustable Rate  Securities'). The  Fund will
invest only  in  the  securities that  are  issued  or guaranteed  by  the  U.S.
Government,   its  agencies  or   instrumentalities  ('Government  Securities').
Although the Fund's portfolio may be  expected to experience low volatility  due
to  the unique characteristics of Adjustable Rate  Securities, the Fund is not a
money market fund that attempts to maintain  a constant net asset value and  the
Fund's  investment portfolio  can be  expected to  experience greater volatility
than that of a money market fund.
    
--------------------------------------------------------------------------------
 
This Statement  of  Additional  Information  should  be  read  together  with  a
Prospectus  of the Fund. A Prospectus may  be obtained without charge by writing
or calling the Trust at the address  or the telephone number listed above.  This
Statement  of Additional Information, although not a prospectus, is incorporated
in its entirety  by reference into  the Prospectus. For  ease of reference,  the
section  headings used in this Statement of Additional Information are identical
to those used in the Prospectus except  as noted in parentheses in the Table  of
Contents.
<PAGE>
--------------------------------------------------------------------------------
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
The  Prospectus discusses the investment objective  of the Fund and the policies
to be employed to  achieve that objective. Supplemental  information is set  out
below  concerning certain of  the securities and other  instruments in which the
Fund may invest,  the investment  techniques and  strategies that  the Fund  may
utilize  and  certain  risks  involved with  those  investments,  techniques and
strategies.
 
ADJUSTABLE RATE SECURITIES
 
   
The Fund invests at least 65% of its total assets in Adjustable Rate Securities,
consisting principally  of mortgage-backed  securities ('MBS').  The  collateral
backing  MBS is usually held  by an independent bailee,  custodian or trustee on
behalf of the holders of the related MBS. The holder of the related MBS (such as
the Fund) will  have either an  ownership interest or  security interest in  the
underlying  collateral and  can exercise  its rights  to it  through the bailee,
custodian or trustee.
    
 
     INDEXES. The key determinant of the interest rates paid on Adjustable  Rate
Securities  is the interest  rate index chosen  (and the spread  relating to the
securities). Certain  indexes  are tied  to  interest rates  paid  on  specified
securities,  such as one-, three- or five-year U.S. Treasury securities, whereas
other indexes are more general. A prominent  example of a general type of  index
is  the  cost  of funds  for  member  institutions (that  is,  savings  and loan
associations and savings banks) for the  Federal Home Loan Bank (the 'FHLB')  of
San Francisco (the 'COFI').
 
     A  number of factors may affect the COFI and cause it to behave differently
from indexes tied to specific types  of securities. The COFI is dependent  upon,
among  other  things,  the  origination  dates  and  maturities  of  the  member
institutions' liabilities. Consequently,  the COFI may  not reflect the  average
prevailing  market interest rates  on new liabilities  of similar maturities. No
assurance can be given that the COFI will necessarily move in the same direction
as prevailing interest rates since as longer term deposits or borrowings  mature
and  are renewed at market  interest rates the COFI  will rise or fall depending
upon the differential between the  prior and the new  rates on the deposits  and
borrowings.  In addition,  associations in the  thrift industry  in recent years
have caused and may continue to cause  the cost of funds of thrift  institutions
to  change for reasons unrelated to changes in general interest rate levels. Any
movement in the COFI as compared  to other indexes based upon specific  interest
rates  may be affected by changes instituted by the FHLB of San Francisco in the
method used to  calculate the  COFI. To  the extent  that the  COFI may  reflect
interest  changes on  a more delayed  basis than  other indexes, in  a period of
rising interest rates any increase may  produce a higher yield later than  would
be  produced by such other indexes. In a period of declining interest rates, the
COFI may remain higher than other market  interest rates, which may result in  a
higher  level  of  principal  prepayments  on  mortgage  loans  that  adjust  in
accordance with the COFI than mortgage or other loans that adjust in  accordance
with  other indexes. In addition,  to the extent that  COFI may lag behind other
indexes in a period of rising interest rates, securities based on COFI may  have
a lower market value than would result from use of other indexes. In a period of
declining  interest rates, securities based on  COFI may reflect a higher market
value than would securities based on other indexes.
 
                                       2
 
<PAGE>
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GOVERNMENT SECURITIES
 
   
Government Securities in which the Fund  may invest include debt obligations  of
varying  maturities issued by the  U.S. Treasury or issued  or guaranteed by the
following agencies  or instrumentalities  of the  U.S. Government:  the  Federal
Housing  Administration, Farmers Home Administration,  Export-Import Bank of the
United  States,  Government  National  Mortgage  Association  ('GNMA'),  General
Services  Administration,  Central Bank  for  Cooperatives, Federal  Farm Credit
Banks,  Federal  Home  Loan  Banks,  Federal  Home  Loan  Mortgage   Corporation
('FHLMC'),    Federal   National   Mortgage   Association   ('FNMA'),   Maritime
Administration,  Student  Loan  Marketing   Association  and  Resolution   Trust
Corporation.  Direct  obligations  of the  U.S.  Treasury include  a  variety of
securities that  differ  in  their  interest  rates,  maturities  and  dates  of
issuance. Because the U.S. Government is not obligated by law to provide support
to  an instrumentality that it sponsors,  the Fund invests in obligations issued
by an instrumentality  of the U.S.  Government only if  Mitchell Hutchins  Asset
Management  Inc.  ('Mitchell  Hutchins'),  the  Fund's  investment  adviser  and
administrator, determines that the instrumentality's  credit risk does not  make
its securities unsuitable for investment by the Fund.
    
 
     GOVERNMENT  NATIONAL MORTGAGE ASSOCIATION. GNMA is a wholly owned corporate
instrumentality of  the U.S.  Government within  the Department  of Housing  and
Urban  Development. The National  Housing Act of 1934,  as amended (the 'Housing
Act'), authorizes GNMA to guarantee the  timely payment of the principal of  and
interest  on securities  that are  based on  and backed  by a  pool of specified
mortgage loans. For these types of  securities to qualify for a GNMA  guarantee,
the  underlying mortgages must be insured  by the Federal Housing Administration
under the Housing Act, or Title V of  the Housing Act of 1949 ('FHA Loans'),  or
be   guaranteed  by   the  Veterans'   Administration  under   the  Servicemen's
Readjustment Act of 1944, as amended ('VA Loans'), or be pools of other eligible
mortgage loans. The Housing Act provides that  the full faith and credit of  the
U.S. Government is pledged to the payment of all amounts that may be required to
be  paid  under any  guarantee.  In order  to  meet its  obligations  under such
guarantee, GNMA  is  authorized  to  borrow  from  the  U.S.  Treasury  with  no
limitations as to amount.
 
   
     GNMA pass-through MBS may represent a proportionate interest in one or more
pools  of the following  types of mortgage  loans, among others:  (1) fixed rate
level payment mortgage loans; (2)  fixed rate graduated payment mortgage  loans;
(3)  fixed rate  growing equity  mortgage loans;  (4) fixed  rate mortgage loans
secured by  manufactured  (mobile)  homes; (5)  mortgage  loans  on  multifamily
residential  properties  under  construction; (6)  mortgage  loans  on completed
multifamily projects; (7) fixed rate mortgage  loans as to which escrowed  funds
are used to reduce the borrower's monthly payments during the early years of the
mortgage  loans ('buydown' mortgage loans); (8)  mortgage loans that provide for
adjustments on payments based on periodic changes in interest rates or in  other
payment terms of the mortgage loans; and (9) mortgage-backed serial notes.
    
 
     FEDERAL  NATIONAL MORTGAGE ASSOCIATION.  FNMA is a  federally chartered and
privately owned  corporation established  under  the Federal  National  Mortgage
Association  Charter  Act.  FNMA was  originally  organized  in 1938  as  a U.S.
Government agency to  add greater  liquidity to  the mortgage  market. FNMA  was
transformed  into a private  sector corporation by  legislation enacted in 1968.
FNMA provides funds to the mortgage market primarily by purchasing home mortgage
loans from  local lenders,  thereby  providing them  with funds  for  additional
lending.
 
                                       3
 
<PAGE>
--------------------------------------------------------------------------------
FNMA  acquires funds  to purchase loans  from investors that  may not ordinarily
invest in mortgage loans directly, thereby  expanding the total amount of  funds
available for housing.
 
     Each  FNMA pass-through MBS  represents a proportionate  interest in one or
more pools  of FHA  Loans, VA  Loans or  conventional mortgage  loans (that  is,
mortgage  loans that are not insured  or guaranteed by any governmental agency).
The loans contained  in those  pools consist of:  (1) fixed  rate level  payment
mortgage  loans; (2)  fixed rate growing  equity mortgage loans;  (3) fixed rate
graduated payment mortgage loans;  (4) variable rate  mortgage loans; (5)  other
adjustable  rate mortgage  loans; and (6)  fixed rate mortgage  loans secured by
multifamily projects.
 
     FEDERAL  HOME   LOAN   MORTGAGE   CORPORATION.   FHLMC   is   a   corporate
instrumentality of the U.S. Government established by the Emergency Home Finance
Act of 1970, as amended (the 'FHLMC Act'). FHLMC was organized primarily for the
purpose  of increasing  the availability  of mortgage  credit to  finance needed
housing. The operations of FHLMC currently consist primarily of the purchase  of
first lien, conventional, residential mortgage loans and participation interests
in  mortgage  loans  and  the  resale  of the  mortgage  loans  in  the  form of
mortgage-backed securities.
 
   
     The mortgage loans underlying the FHLMC MBS typically consist of fixed rate
or adjustable rate mortgage loans with original terms to maturity of between  10
and  30 years, substantially all of which are  secured by first liens on one- to
four-family residential properties or  multifamily projects. Each mortgage  loan
must  meet the  applicable standards  set out in  the FHLMC  Act. Mortgage loans
underlying FHLMC MBS may include  whole loans, participation interests in  whole
loans and undivided interests in whole loans and participations in another FHLMC
MBS.
    
 
INVESTMENT TECHNIQUES AND STRATEGIES
 
   
     LENDING  PORTFOLIO  SECURITIES.  The  Fund  may  lend  portfolio securities
guaranteed by the United States or by specified agencies of the United States to
well-known and  recognized registered  brokers or  dealers and  Federal  Deposit
Insurance Company ('FDIC') insured banks. These loans, if and when made, may not
exceed  33 1/3%  of the value  of the Fund's  total assets. The  Fund's loans of
securities will  be collateralized  by  cash, letters  of credit  or  Government
Securities.  The  cash  or  instruments  collateralizing  the  Fund's  loans  of
securities will be  maintained at  all times in  a segregated  account with  the
Fund's  custodian, or  with a  designated sub-custodian,  in an  amount at least
equal to the current market value of  the loaned securities. From time to  time,
the Fund may pay a part of the interest earned from the investment of collateral
received  for securities  loaned to  the borrower and/or  a third  party that is
unaffiliated with the Fund  and is acting  as a 'finder.'  The Fund will  comply
with  the following conditions  whenever it loans securities:  (1) the Fund must
receive at  least  100%  cash  collateral  or  equivalent  securities  from  the
borrower;  (2) the  borrower must  increase the  collateral whenever  the market
value of the securities loaned rises above the level of the collateral; (3)  the
Fund  must be able to terminate the loan  at any time; (4) the Fund must receive
reasonable interest on  the loan, as  well as any  dividends, interest or  other
distributions  on the loaned  securities, and any increase  in market value; (5)
the Fund may pay only reasonable custodian fees in connection with the loan; and
(6) voting rights on the loaned securities may pass to the borrower except that,
if a material
    
 
                                       4
 
<PAGE>
--------------------------------------------------------------------------------
event adversely affecting the  investment in the  loaned securities occurs,  the
Trust's  Board of Trustees must terminate the  loan and regain the right to vote
the securities.
 
     WHEN-ISSUED AND  DELAYED-DELIVERY  SECURITIES.  When the  Fund  engages  in
when-issued  or delayed-delivery securities transactions, it relies on the other
party to consummate the trade. Failure of the seller to do so may result in  the
Fund's  incurring a loss or missing an  opportunity to obtain a price considered
to be advantageous.
 
INVESTMENT RESTRICTIONS
 
Investment restrictions numbered  1 through 10  below have been  adopted by  the
Trust  as fundamental  policies with respect  to the Fund.  Under the Investment
Company Act of 1940, as amended (the  '1940 Act'), a fundamental policy may  not
be  changed without the vote of a  majority of the outstanding voting securities
of the Fund,  as defined in  the 1940 Act.  Investment restrictions numbered  11
through  13 may  be changed  by a  vote of  a majority  of the  Trust's Board of
Trustees at any time.
 
     Under the investment restrictions adopted by the Trust with respect to  the
Fund:
 
          1.  The  Fund  will  not purchase  securities  (other  than Government
     Securities) of any issuer if, as a result of the purchase, more than 5%  of
     the value of the Fund's total assets would be invested in the securities of
     the  issuer, except that up to 25% of  the value of the Fund's total assets
     may be invested without regard to this 5% limitation.
 
          2. The Fund will not purchase  more than 10% of the voting  securities
     of  any one issuer,  except that this  limitation is not  applicable to the
     Fund's investments in Government Securities, and up to 25% of the value  of
     the  Fund's  total  assets  may  be invested  without  regard  to  this 10%
     limitation.
 
          3. The Fund will not issue  senior securities or borrow money,  except
     that  the  Fund  may  borrow from  banks  for  temporary,  extraordinary or
     emergency purposes and enter into reverse repurchase agreements.
 
          4. The  Fund will  not lend  money to  other persons,  except  through
     purchasing  debt  obligations,  entering  into  repurchase  agreements  and
     lending portfolio securities  in an  amount not to  exceed 33  1/3% of  the
     value of the Fund's total assets.
 
          5.  The Fund will  invest no more than  25% of the  value of its total
     assets in  securities of  issuers in  any one  industry, except  that  this
     limitation  is  not  applicable  to  the  Fund's  investment  in Government
     Securities.
 
          6. The Fund will  not purchase securities on  margin, except that  the
     Fund  may  obtain any  short-term credits  necessary  for the  clearance of
     purchases and sales of securities.
 
          7. The  Fund will  not purchase  or sell  real estate  or real  estate
     limited  partnership interests, except that the  Fund may purchase and sell
     securities collateralized by interests in real estate.
 
          8. The  Fund  will  not  purchase or  sell  commodities  or  commodity
     contracts  or  futures  contracts  and related  options  and  other similar
     contracts.
 
          9. The Fund will  not invest in  oil, gas or  other mineral leases  or
     exploration or development programs.
 
          10. The Fund will not act as an underwriter of securities, except that
     the  Fund  may  acquire securities  under  circumstances in  which,  if the
     securities were sold,  the Fund might  be deemed to  be an underwriter  for
     purposes of the Securities Act of 1933.
 
                                       5
 
<PAGE>
--------------------------------------------------------------------------------
 
          11.  The Fund will not make  investments for the purpose of exercising
     control of management.
 
   
          12. The Fund will not purchase or retain securities of any company if,
     to the knowledge of the  Fund, any of the  Trust's Trustees or officers  or
     any  officer or director  of Mitchell Hutchins  individually owns more than
     .5% of the  outstanding securities  of the  company and  together they  own
     beneficially more than 5% of the securities.
    
 
          13. The Fund will not invest in warrants (other than warrants acquired
     by  the Fund as  part of a  unit or attached  to securities at  the time of
     purchase) if, as a result, the investments (valued at the lower of cost  or
     market)  would exceed 5% of the value of the Fund's net assets of which not
     more than 2%  of the  Fund's net  assets may  be invested  in warrants  not
     listed on a recognized foreign or domestic stock exchange.
 
     Notwithstanding  the foregoing  investment restrictions,  which are imposed
under the  1940 Act  and certain  state laws,  the Fund  invests exclusively  in
Government  Securities, repurchase agreements  and reverse repurchase agreements
with respect to those  securities and loans of  those securities. The Trust  may
make  commitments  regarding the  Fund  more restrictive  than  the restrictions
listed above so as to  permit the sale of the  Fund's shares in certain  states.
Should  the Trust determine that a commitment is no longer in the best interests
of the  Fund and  its shareholders,  the  Trust will  revoke the  commitment  by
terminating  the sale of the Fund's shares in the state involved. The percentage
limitations contained in  the restrictions  listed above  apply at  the time  of
purchases of securities.
 
PORTFOLIO TRANSACTIONS AND TURNOVER
 
   
Decisions to buy and sell securities for the Fund are made by Mitchell Hutchins,
subject  to  review  by the  Trust's  Board  of Trustees.  The  Fund's portfolio
securities ordinarily are purchased  from and sold to  parties acting as  either
principal  or agent. Newly  issued securities ordinarily  are purchased directly
from the issuer or  from an underwriter; other  purchases and sales usually  are
placed with those dealers from which it appears that the best price or execution
will  be obtained. Usually  no brokerage commissions,  as such, are  paid by the
Fund for purchases and sales undertaken through principal transactions, although
the price paid usually includes an undisclosed compensation to the dealer acting
as agent. The  prices paid to  underwriters of newly  issued securities  usually
include  a concession paid  by the issuer  to the underwriter,  and purchases of
after-market securities from dealers ordinarily are executed at a price  between
the bid and asked price.
    
 
   
     In  selecting  brokers or  dealers  to execute  securities  transactions on
behalf of the Fund, Mitchell Hutchins seeks the best overall terms available. In
assessing the  best  overall  terms  available  for  any  transaction,  Mitchell
Hutchins  considers factors that it deems relevant, including the breadth of the
market in the security, the price  of the security, the financial condition  and
execution  capability  of the  broker or  dealer and  the reasonableness  of the
commission, if any, for the specific transaction and on a continuing basis.
    
 
   
     Consistent with the Fund's interests and subject to the review of the Board
of Directors,  Mitchell  Hutchins  may  cause the  Fund  to  purchase  and  sell
portfolio  securities from and to dealers,  or through brokers which provide the
Fund with research, analysis,  advice and similar services.  In return for  such
services,  the Fund  may pay to  those brokers  a higher commission  than may be
charged by other  brokers, provided  that Mitchell Hutchins  determines in  good
faith  that such  commission is  reasonable in  terms either  of that particular
transaction or of the overall
    
 
                                       6
 
<PAGE>
--------------------------------------------------------------------------------
   
responsibility of Mitchell Hutchins to the  Fund and its other clients and  that
the  total commissions paid  by the Fund  will be reasonable  in relation to the
benefits  to  the  Fund  over  the  long  term.  For  purchases  or  sales  with
broker-dealer  firms  which  act  as  principal,  Mitchell  Hutchins  seeks best
execution. Although Mitchell Hutchins may receive certain research or  execution
services  in  connection with  these  transactions, Mitchell  Hutchins  will not
purchase securities at a higher price or  sell securities at a lower price  than
would  otherwise be paid if no weight was attributed to the services provided by
the executing  dealer.  Moreover, Mitchell  Hutchins  will not  enter  into  any
explicit  soft dollar arrangements  relating to principal  transactions and will
not receive  in principal  transactions the  types of  services which  could  be
purchased  for hard dollars. Mitchell Hutchins may engage in agency transactions
in OTC equity and debt securities in return for research and execution services.
These transactions are entered into only in compliance with procedures  ensuring
that  the transaction  (including commissions)  is at  least as  favorable as it
would have been if  effected directly with a  market-maker that did not  provide
research  or  execution  services. These  procedures  include  Mitchell Hutchins
receiving multiple quotes from  dealers before executing  the transaction on  an
agency basis.
    
 
   
     Research services furnished by dealers or brokers with or through which the
Fund  effects  securities  transactions  may be  used  by  Mitchell  Hutchins in
advising other funds or accounts and, conversely, research services furnished to
Mitchell Hutchins  by dealers  or  brokers in  connection  with other  funds  or
accounts  Mitchell Hutchins advises may be used by Mitchell Hutchins in advising
the Fund. Information and research received from such brokers or dealers will be
in addition to, and  not in lieu  of, the services required  to be performed  by
Mitchell  Hutchins under  the investment  advisory and  administration agreement
between the Trust  and Mitchell  Hutchins relating  to the  Fund (the  'Advisory
Agreement').
    
 
   
     Over-the-counter  purchases and sales  by the Fund  are transacted directly
with principal market makers  except in those cases  in which better prices  and
executions  may be obtained elsewhere. The  Fund does not purchase any security,
including Government Securities,  during the  existence of  any underwriting  or
selling  group relating to the security of which Mitchell Hutchins or any of its
affiliates  is  a  member,   except  to  the   extent  permitted  under   rules,
interpretations  or exemptions  of the  Securities and  Exchange Commission (the
'SEC').
    
     The Fund does  not consider portfolio  turnover rate a  limiting factor  in
making  investment decisions. The Fund's turnover rate is calculated by dividing
the lesser of purchases  or sales of  portfolio securities for  the year by  the
monthly  average  value  of  portfolio  securities.  Securities  with  remaining
maturities of one year or less on the date of acquisition are excluded from  the
calculation.
 
                             MANAGEMENT OF THE FUND
 
TRUSTEES AND OFFICERS
 
The names of Trustees and officers of the Trust, together with information as to
their  principal  business occupations  during the  last  five years,  are shown
below. An asterisk appears before the name of each Trustee who is an 'interested
person' of the Trust, as defined in the 1940 Act.
   
    
 
   
     David J. Beaubien, 60, Trustee.  Chairman of Yankee Environmental  Systems,
Inc.,  manufacturer of  meteorological measuring  instruments. Director  of IEC,
Inc.,  manufacturer  of  electronic   assemblies,  Belfort  Instruments,   Inc.,
manufacturer  of environmental instruments,  and Oriel Corp.,  a manufacturer of
optical  instruments.   Prior   to   January   1991,   Senior   Vice   President
    
 
                                       7
 
<PAGE>
--------------------------------------------------------------------------------
   
of  EG&G, Inc., a  company that makes  and provides a  variety of scientific and
technically oriented  products  and services.  Mr.  Beaubien is  a  director  or
trustee  of  12  other  investment  companies  for  which  Mitchell  Hutchins or
PaineWebber serves as investment adviser.
    
   
     William W.  Hewitt,  Jr.,  66,  Trustee.  Trustee  of  The  Guardian  Asset
Allocation  Fund, The Guardian Baillie  Gifford International Fund, The Guardian
Bond Fund, Inc., The Guardian Cash Fund, Inc., The Guardian Park Ave. Fund,  The
Guardian  Stock Fund,  Inc., The  Guardian Cash  Management Trust,  The Guardian
Investment Quality Bond Fund, The Guardian Tax-Exempt Fund and The Guardian U.S.
Government Trust. Mr.  Hewitt is a  director or trustee  of 12 other  investment
companies  for  which  Mitchell  Hutchins or  PaineWebber  serves  as investment
adviser.
    
   
    
   
     Thomas R. Jordan, 66, Trustee. Principal of The Dilenschneider Group, Inc.,
a corporate communications and public  policy counseling firm. Prior to  January
1992,  Senior Vice President of  Hill & Knowlton, a  public relations and public
affairs firm. Prior to April 1991,  President of The Jordan Group, a  management
consulting  and strategies development firm. Mr. Jordan is a director or trustee
of 12  other investment  companies for  which Mitchell  Hutchins or  PaineWebber
serves as investment adviser.
    
   
     Carl  W.  Schafer, 59,  Trustee. President  of  the Atlantic  Foundation, a
charitable foundation supporting mainly oceanographic exploration and  research.
Director  of International Agritech Resources,  Inc., an agribusiness investment
and consulting firm, Ardic Exploration and Development Ltd. and Hidden Lake Gold
Mines Ltd., gold mining companies, Electronic Clearing House, Inc., a  financial
transactions  processing  company, Wainoco  Oil  Corporation and  Bio Techniques
Laboratories Inc., an agricultural biotechnology company. Prior to January 1993,
chairman of  the Investment  Advisory  Committee of  the Howard  Hughes  Medical
Institute and director of Ecova Corporation, a toxic waste treatment firm. Prior
to May 1990, principal of Rockefeller and Company, Inc., manager of investments.
Mr.  Schafer is a director or trustee of 12 other investment companies for which
Mitchell Hutchins or PaineWebber serves as investment adviser.
    
   
    
 
   
     * Frank P.L.  Minard, 49,  President. Mr.  Minard is  chairman of  Mitchell
Hutchins,  chairman of  the board  of Mitchell  Hutchins Institutional Investors
Inc. and a director of PaineWebber Incorporated ('PaineWebber'). Prior to  1993,
Mr. Minard was managing director of Oppenheimer Capital in New York and Director
of Oppenheimer Capital Ltd. in London. Mr. Minard is a director or trustee of 26
other  investment companies for which Mitchell Hutchins or PaineWebber serves as
investment adviser.
    
 
   
     Dennis L. McCauley, 48, Vice President. Mr. McCauley is a Managing Director
and Chief Investment  Officer --  Fixed Income  of Mitchell  Hutchins. Prior  to
            1994 he was Director of Fixed Income Investments of IBM Corporation.
Mr.  McCauley is also a vice president of 8 other investment companies for which
Mitchell Hutchins or PaineWebber serves as investment adviser.
    
 
   
     Ann E. Moran, 37,  Vice President and Assistant  Treasurer. Ms. Moran is  a
vice  president of  Mitchell Hutchins.  Ms. Moran is  also a  vice president and
assistant treasurer of 39 other investment companies for which Mitchell Hutchins
or PaineWebber serves as investment adviser.
    
 
   
     Dianne E. O'Donnell, 42, Vice President  and Secretary. Ms. O'Donnell is  a
senior vice president and senior associate general counsel of Mitchell Hutchins.
Ms.  O'Donnell is  also a  vice president and  secretary of  39 other investment
companies for  which  Mitchelll Hutchins  or  PaineWebber serves  as  investment
adviser.
    
 
                                       8
 
<PAGE>
--------------------------------------------------------------------------------
 
   
     Victoria  E. Schonfeld,  44, Vice  President. Ms.  Schonfeld is  a managing
director and general counsel of Mitchell  Hutchins. From April 1990 to May  1994
she  was a partner in the law firm of  Arnold & Porter. Prior to April 1990, she
was a partner  in the  law firm  of Shereff,  Friedman, Hoffman  & Goodman.  Ms.
Schonfeld  is  also  a  vice  president  and  assistant  secretary  of  39 other
investment companies  for  which  Mitchell Hutchins  or  PaineWebber  serves  as
investment adviser.
    
 
   
     Paul  H. Schubert, 31, Vice President and Assistant Treasurer. Mr. Schubert
is a vice president of  Mitchell Hutchins. From August  1992 to August 1994,  he
was  a vice  president at  BlackRock Financial  Management L.P.  Prior to August
1992, he was an  audit manager with Ernst  & Young LLP. Mr.  Schubert is also  a
vice  president and  assistant treasurer  of 39  other investment  companies for
which Mitchell Hutchins or PaineWebber serves as investment adviser.
    
 
   
     Nirmal Singh, 38, Vice President. Mr. Singh is a vice president of Mitchell
Hutchins. Prior to             1993 he was a member of the portfolio  management
team  at Merrill Lynch Asset Management. Mr. Singh is also a vice president of 2
other investment companies for which Mitchell Hutchins or PaineWebber serves  as
investment adviser.
    
 
   
     Martha J. Slezak, 32, Vice President and Assistant Treasurer. Ms. Slezak is
a  vice president of Mitchell  Hutchins. From September 1991  to April 1992, she
was a fundraising director for a U.S. Senate campaign. Prior to September  1991,
she  was a  tax manager with  Arthur Andersen  & Co. Ms.  Slezak is  also a vice
president and assistant  treasurer of  39 other investment  companies for  which
Mitchell Hutchins or PaineWebber serves as investment adviser.
    
 
   
     Julian  F. Sluyters,  34, Vice President  and Treasurer. Mr.  Sluyters is a
senior vice president and  the director of the  mutual fund finance division  of
Mitchell  Hutchins. Prior to 1991,  he was an audit  senior manager with Ernst &
Young LLP. Mr.  Sluyters is  also a  vice president  and treasurer  of 39  other
investment  companies  for  which  Mitchell Hutchins  or  PaineWebber  serves as
investment adviser.
    
 
   
     Gregory K. Todd, 38, Vice President and Assistant Secretary. Mr. Todd is  a
first  vice president and associate general  counsel of Mitchell Hutchins. Prior
to 1993, he  was a partner  with the law  firm of Shereff,  Friedman, Hoffman  &
Goodman.  Mr. Todd is also a vice  president and assistant secretary of 39 other
investment companies  for  which  Mitchell Hutchins  or  PaineWebber  serves  as
investment adviser.
    
 
   
     The  Trustees  and officers  of the  Trust  are directors,  trustees and/or
officers of other mutual funds managed by Mitchell Hutchins or PaineWebber.  The
addresses  of the non-interested Trustees are as follows: Mr. Beaubien, Montague
Industrial Park,  101  Industrial Road,  Box  746, Turner  Falls,  Massachusetts
01376;  Mr. Hewitt, P.O. Box 2359, Princeton, New Jersey 08543-2359; Mr. Jordan,
200 Park Avenue,  New York,  New York  10166; and  Mr. Schafer,  P.O. Box  1164,
Princeton,  New Jersey 08542. The address of Mr. Minard and each of the officers
is 1285 Avenue of the Americas, New York, New York 10019.
    
   
     By virtue of the  responsibilities assumed by  Mitchell Hutchins under  its
Advisory  Agreement with  the Trust,  the Fund  requires no  executive employees
other than officers of the Trust, none of whom devotes full time to the  affairs
of  the Fund. Trustees and officers of the Trust, as a group, owned less than 1%
of the  outstanding  shares  of  beneficial interest  of  the  Fund's  Financial
Intermediary  shares and Institutional shares as  of February 1, 1995. The Trust
pays each  Trustee who  is not  an  officer, director  or employee  of  Mitchell
Hutchins,  or any of its affiliates, an  annual retainer of $1,000, and $375 for
each Trustees meeting  attended, and  reimburses the  Trustee for  out-of-pocket
expenses associated with attendance at Board meetings.
    
 
                                       9
 
<PAGE>
--------------------------------------------------------------------------------
   
The  Chairman of the Board's audit committee  receives an annual fee of $250. No
officer, director or employee  of Mitchell Hutchins, or  any of its  affiliates,
receives any compensation from the Trust for serving as an officer or Trustee of
the  Trust. The amount of compensation paid by the Trust to each Trustee for the
period from March 24, 1994 (commencement of operations) through the fiscal  year
ended  November 30, 1994, and the aggregate  amount of compensation paid to each
such Trustee for the  year ended December  31, 1994 by all  funds in the  former
Kidder Family of Funds for which such person is a Board member were as follows:
    
 
   
<TABLE>
<CAPTION>
                                                                                                       (5)
                                                                                                      TOTAL
                                                             (3)                                  COMPENSATION
                                       (2)               PENSION OR               (4)           FROM TRUST AND 12
             (1)                    AGGREGATE        RETIREMENT BENEFITS    ESTIMATED ANNUAL    OTHER INVESTMENT
        NAME OF BOARD           COMPENSATION FROM    ACCRUED AS PART OF      BENEFITS UPON      COMPANIES IN THE
           MEMBER                    TRUST*           TRUST'S EXPENSES         RETIREMENT         FUND COMPLEX
-----------------------------   -----------------    -------------------    ----------------    -----------------
<S>                             <C>                  <C>                    <C>                 <C>
David J. Beaubien                    $ 1,250                 None                 None               $80,700
William W. Hewitt, Jr.               $ 1,250                 None                 None               $74,425
Thomas R. Jordan                     $ 1,250                 None                 None               $83,125
Carl W. Schafer                      $ 1,250                 None                 None               $84,575
</TABLE>
    
 
   
------------
    
 
   
     * Amount does not include reimbursed expenses for attending Board meetings,
       which amounted to approximately $73 for all Trustees as a group.
    
 
   
INVESTMENT ADVISER AND ADMINISTRATOR
    
   
Mitchell  Hutchins, located at 1285 Avenue of  the Americas, New York, New York,
10019, bears all expenses in connection with the performance of its services  as
the  Fund's investment adviser and  administrator. Under the Advisory Agreement,
Mitchell Hutchins  has agreed  that, if  in any  fiscal year  of the  Fund,  the
aggregate  expenses  of  the  Fund  (including  management  fees,  but excluding
interest, taxes, brokerage and, with the prior written consent of the  necessary
state   securities  commissions,  extraordinary  expenses)  exceed  the  expense
limitation of any state  having jurisdiction over  the Trust, Mitchell  Hutchins
will  reimburse the  Trust for  the excess  expense. This  expense reimbursement
obligation is  limited to  the  amount of  Mitchell  Hutchins's fees  under  the
Advisory  Agreement. Any expense reimbursement will be estimated, reconciled and
paid on  a  monthly basis.  As  of the  date  of this  Statement  of  Additional
Information,  the most  restrictive state  expense limitation  applicable to the
Fund requires reimbursement  of expenses in  any year that  the Fund's  expenses
subject  to the limitation exceed 2 1/2% of the first $30 million of the average
daily value of the Fund's net assets, 2% of the next $70 million of the  average
daily  value of the Fund's net assets and  1 1/2% of the remaining average daily
value of the Fund's net assets. For the period from March 24, 1994 (commencement
of operations) through the fiscal year  ended November 30, 1994, the Trust  paid
(or  accrued)  to Kidder  Peabody Asset  Management,  Inc. ('KPAM'),  the Fund's
predecessor  investment  adviser  and  administrator,  investment  advisory  and
administrative fees of $393,116 (of which $171,511 was waived).
    
 
                                       10
 
<PAGE>
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DISTRIBUTOR
 
   
Mitchell  Hutchins is the  distributor of the  Fund's shares and  is acting on a
best efforts basis.
    
 
CUSTODIAN AND TRANSFER, DIVIDEND AND RECORDKEEPING AGENT
 
   
Investors Fiduciary Trust  Company ('IFTC'),  located at 127  West 10th  Street,
Kansas  City, Missouri 64105, serves as the Fund's custodian. As custodian, IFTC
maintains custody of the Fund's  portfolio securities and calculates the  Fund's
net asset value per share. Under its custodial agreement with the Trust, IFTC is
authorized  to appoint  one or  more banking  institutions as  sub-custodians of
assets owned  by  the  Fund. PFPC  Inc.,  a  subsidiary of  PNC  Bank,  National
Association,  whose  principal  address  is  400  Bellevue  Parkway, Wilmington,
Delaware 19809, serves as the Fund's transfer, dividend and recordkeeping agent.
As transfer  agent, PFPC  Inc. maintains  the Trust's  official record  of  Fund
shareholders  and, as  dividend agent,  PFPC Inc.  is responsible  for crediting
dividends to the  accounts of  Fund shareholders. As  recordkeeping agent,  PFPC
Inc. maintains certain accounting and financial records of the Fund.
    
 
INDEPENDENT AUDITORS
 
   
Deloitte & Touche LLP, located at Two World Financial Center, New York, New York
10281, serves as independent auditors for the Fund. In that capacity, Deloitte &
Touche LLP audits the Fund's annual financial statements.
    
 
COUNSEL
 
Willkie  Farr & Gallagher, located at One Citicorp Center, 153 East 53rd Street,
New York, New York 10022, serves as counsel to the Trust.
 
FINANCIAL INTERMEDIARIES
 
   
The Trust will  enter into an  agreement with each  financial intermediary  that
purchases Financial Intermediary shares requiring it to provide support services
to   its  customers  who  beneficially  own  Financial  Intermediary  shares  in
consideration of the  Trust's payment of  .25% (on an  annualized basis) of  the
average  daily net asset value of the  Financial Intermediary shares held by the
financial intermediary for the benefit of its customers. These services include:
(i) aggregating and processing purchase  and redemption requests from  customers
and  placing net purchase and redemption orders with PaineWebber; (ii) providing
customers with a service that invests the assets of their accounts in  Financial
Intermediary shares; (iii) processing dividend payments from the Trust on behalf
of customers; (iv) providing information periodically to customers showing their
positions  in Financial Intermediary shares; (v)  arranging for bank wires; (vi)
responding for  customer inquiries  relating to  the services  performed by  the
financial intermediary; (vii) providing sub-accounting with respect to Financial
Intermediary shares beneficially owned by customers or the information necessary
for  sub-accounting; (viii) forwarding shareholder communications from the Trust
(such as  proxies,  shareholder  reports  and  dividend,  distribution  and  tax
notices)  to customers, if required  by law; and (ix)  other similar services if
requested by the  Trust. For  the period from  March 24,  1994 (commencement  of
operations)  through the  fiscal year  ended November  30, 1994,  the Trust paid
    
 
                                       11
 
<PAGE>
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(or accrued) to financial intermediaries  shareholder servicing fees of  $26,679
(of which $3,942 was reimbursed by KPAM).
    
     The  Trust's  agreements with  financial intermediaries  are governed  by a
Shareholder Services  Plan (the  'Plan') adopted  by the  Board of  Trustees  in
connection  with the offering of Financial  Intermediary shares. Pursuant to the
Plan, the Trustees review, at least  quarterly, a written report of the  amounts
expended  under  the Trust's  agreements with  financial intermediaries  and the
purposes for  which  the  expenditures  were  made.  In  addition,  the  Trust's
arrangements  with  financial  intermediaries  must be  approved  annually  by a
majority of  the  Trustees,  including  a  majority  of  Trustees  who  are  not
'interested  persons' of the Trust as defined in the 1940 Act and have no direct
or  indirect  financial  interest  in  these  arrangements  (the  'Disinterested
Trustees').
 
     The  Board of Trustees may approve  the Trust's arrangements with financial
intermediaries  if,  based  on  information  provided  by  the  Trust's  service
contractors, there is a reasonable likelihood that the arrangements will benefit
the  Trust and  its shareholders by  affording the Trust  greater flexibility in
connection with the servicing  of the accounts of  the beneficial owners of  its
shares in an efficient manner. Any material amendment to the Fund's arrangements
with  financial intermediaries must  be approved by  a majority of  the Board of
Trustees including a  majority of  the Disinterested  Trustees. So  long as  the
Trust's  arrangements with financial intermediaries are in effect, the selection
and nomination of the members of the  Board of Trustees who are not  'interested
persons'  of the  Trust, as defined  in the 1940  Act, will be  committed to the
discretion of those non-interested Trustees.
 
   
     Conflict of interest restrictions may  apply to a financial  intermediary's
receipt  of compensation paid by  the Fund in connection  with the investment of
fiduciary funds  in  Financial Intermediary  shares.  Financial  intermediaries,
including  banks regulated  by the  Comptroller of  the Currency  and investment
advisers subject to  the jurisdiction  of the SEC,  the Department  of Labor  or
state  securities commissions, are urged to  consult their legal advisors before
investing fiduciary funds in Financial Intermediary shares. See also 'Management
of the Fund --  Financial Intermediaries' in the  Fund's Prospectus relating  to
Financial Intermediary shares.
    
 
                             PRINCIPAL SHAREHOLDERS
 
   
     With  respect to  the Fund,  to the knowledge  of the  Trust, the following
persons owned of record 5% or  more of the Fund's Financial Intermediary  shares
of beneficial interest on March 20, 1995:
    
   
    
   
          For  CCHHED  Main Line  Health, First  Fidelity  Bank NA  Trustee, c/o
     Mitchell Hutchins Asset Management Inc.,  1285 Avenue of the Americas,  New
     York, New York 10019, owned 95.14% of the Financial Intermediary shares.
    
 
   
     With  respect to  the Fund,  to the knowledge  of the  Trust, the following
persons owned  of  record 5%  or  more of  the  Fund's Institutional  shares  of
beneficial interest on March 20, 1995:
    
   
    
   
          Cyrk International Foundation, Attention David H. Brault, c/o Mitchell
     Hutchins  Asset Management Inc., 1285 Avenue of the Americas, New York, New
     York 10019, owned 5.43% of the outstanding Institutional shares.
    
 
   
          Psychiatric Hospitals  of  Pennsylvania,  T/A  Eugenia  Hospital,  c/o
     Mitchell  Hutchins Asset Management Inc., 1285  Avenue of the Americas, New
     York, New York 10019, owned 18.45% of the outstanding Institutional shares.
    
 
                                       12
 
<PAGE>
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          Texas Commerce Bank NA, as escrow for Trinity Industries Inc./Platzer,
     c/o Mitchell Hutchins Asset Management  Inc., 1285 Avenue of the  Americas,
     New  York, New  York 10019, owned  11.85% of  the outstanding Institutional
     shares.
    
 
   
          Applied  Business  Technology  Corp.,  c/o  Mitchell  Hutchins   Asset
     Management  Inc., 1285  Avenue of the  Americas, New York,  New York 10019,
     owned 9.11% of the outstanding Institutional shares.
    
 
   
          Larry &  Janet  Sanders  Trustees, FBO  Sanders  Trust,  c/o  Mitchell
     Hutchins  Asset Management Inc., 1285 Avenue of the Americas, New York, New
     York 10019, owned 5.15% of the outstanding Institutional shares.
    
 
   
          Cyrk Foundation,  Gregory P.  Shlopak Trustee,  c/o Mitchell  Hutchins
     Asset  Management Inc.,  1285 Avenue  of the  Americas, New  York, New York
     10019, owned 11.88% of the outstanding Institutional shares.
    
 
   
          Lucille Salter Packard  Childrens Hospital at  Stanford, General  Fund
     1992,  c/o  Mitchell Hutchins  Asset Management  Inc.,  1285 Avenue  of the
     Americas, New  York,  New  York  10019,  owned  15.5%  of  the  outstanding
     Institutional shares.
    
 
   
          Fountain  Valley Regional, Hospital Employee Benefit Plan & Trust, c/o
     Mitchell Hutchins Asset Management Inc.,  1285 Avenue of the Americas,  New
     York, New York 10019, owned 11.76% of the outstanding Institutional shares.
    
 
     The  Fund is  not aware  as to whether  or to  what extent  shares owned of
record also are owned beneficially.
 
                       PURCHASE AND REDEMPTION OF SHARES
 
PURCHASE AND REDEMPTION
 
Information on  how  to purchase  and  redeem Fund  shares  is included  in  the
Prospectuses.
 
     Under  the  1940 Act,  the Trust  may  suspend the  right of  redemption or
postpone the date of payment upon redemption for any period during which the New
York Stock  Exchange  is  closed,  other  than  customary  weekend  and  holiday
closings,  during which trading  on that exchange is  restricted or during which
(as determined by the SEC by rule or regulation) an emergency exists as a result
of which  disposal  or  valuation  of portfolio  securities  is  not  reasonably
practicable  or for such other periods as the SEC may permit. The Trust may also
suspend or  postpone the  recordation of  the transfer  of its  shares upon  the
occurrence of any of the foregoing conditions. In addition, the Trust may redeem
shares  involuntarily  in  certain  other instances  if  the  Board  of Trustees
determines that failure to redeem may have material adverse consequences to  the
Trust's  shareholders in general. The Trust is obligated to redeem shares solely
in cash up to $250,000 or 1% of a Fund's net asset value, whichever is less, for
any one shareholder within  a 90-day period. Any  redemption beyond this  amount
also  will be in  cash unless the  Board of Trustees  determines that conditions
exist that  make  payment  of  redemption proceeds  wholly  in  cash  unwise  or
undesirable.  In such  a case, the  Trust may  make payment wholly  or partly in
securities or other property (known as 'redemption in kind'), valued in the same
way as the Trust determines net asset value. Redemption in kind is not as liquid
as a cash redemption.  Shareholders who receive a  redemption in kind may  incur
transaction  costs if they sell the securities  or property and may receive less
than the redemption value of the securities or property upon sale,  particularly
where the securities are sold prior to maturity.
 
                                       13
 
<PAGE>
--------------------------------------------------------------------------------
 
   
     Any financial intermediary purchasing shares on behalf of separate accounts
will  be  required  to hold  the  shares in  a  single nominee  name  (a 'Master
Account'). Investors  investing  in  both  Institutional  shares  and  Financial
Intermediary  shares, must maintain a separate  Master Account for each class of
shares. Financial intermediaries may arrange with Mitchell Hutchins, the Trust's
distributor, for certain sub-accounting services (such as purchase,  redemption,
and  dividend recordkeeping) with respect to  holders of Institutional shares if
Mitchell Hutchins is provided with the information necessary for sub-accounting.
Sub-accounting may  be established  by name  or number  either when  the  Master
Account is opened or later.
    
 
   
     After  a wire  transfer has  been initiated  by Mitchell  Hutchins, neither
Mitchell Hutchins  nor the  Trust  assumes any  further responsibility  for  the
performance  of  financial  intermediaries  or  the  shareholder's  bank  in the
transfer process. If  a problem of  this nature arises,  the shareholder  should
deal directly with the financial intermediaries or bank.
    
 
                        DETERMINATION OF NET ASSET VALUE
 
As  noted in the Prospectuses, net asset value will not be calculated on certain
holidays. On  those  days, securities  held  by  the Fund  may  nevertheless  be
actively  traded,  and the  value of  the Fund's  shares could  be significantly
affected.
 
                               EXCHANGE PRIVILEGE
 
The exchange  privilege  described  in  the Prospectuses  may  be  suspended  or
postponed  if (1) redemption of Fund shares  is suspended under Section 22(e) of
the 1940 Act  or (2)  the Trust  temporarily delays or  ceases the  sale of  the
Fund's  shares  because the  Fund  is unable  to  invest amounts  effectively in
accordance with its investment objective, policies and restrictions.
 
     Shares of each class may be exchanged  for shares of the same class in  the
following  funds, each of which is a series of Liquid Institutional Reserves, to
the extent shares are offered for  sale in the shareholder's state of  residence
and,  with respect to  Financial Intermediary shares,  through the shareholder's
financial intermediary. Each of the following funds seeks high current income to
the extent consistent with  the preservation of capital  and the maintenance  of
liquidity  through investments in a diversified portfolio of high quality, short
term, U.S. dollars denominated money market instruments.
 
   
      Government Securities Fund
    
 
   
      Money Market Fund
    
 
   
      Treasury Securities Fund
    
 
                                     TAXES
 
Set forth below  is a  summary of  certain income  tax considerations  generally
affecting  the  Fund and  its shareholders.  The  summary is  not intended  as a
substitute for individual tax  planning, and shareholders  are urged to  consult
their  tax  advisors  regarding the  application  of federal,  state,  local and
foreign tax laws to their specific tax situations.
 
                                       14
 
<PAGE>
--------------------------------------------------------------------------------
 
TAX STATUS OF THE FUND AND ITS SHAREHOLDERS
 
   
The Trust intends for the Fund to continue to qualify each year as a  'regulated
investment  company' under the Internal Revenue Code of 1986, as amended. If the
Fund  (1)  is  a  regulated  investment  company  and  (2)  distributes  to  its
shareholders  at  least 90%  of its  net investment  income (including  for this
purpose its net realized short-term capital gains), the Fund will not be  liable
for  federal income taxes to  the extent that its  net investment income and its
net realized long-term and short-term capital gains, if any, are distributed  to
its shareholders.
    
 
     As  a general rule, a shareholder's gain or loss on a sale or redemption of
Fund shares is a long-term capital gain or loss if the shareholder has held  the
shares  for more than one year. The gain or loss is a short-term capital gain or
loss if the shareholder has held the shares for one year or less.
 
   
     The  Fund's  net  realized  long-term  capital  gains  are  distributed  as
described  in the Prospectuses. The distributions ('capital gain dividends'), if
any, are taxable to shareholders as  long-term capital gains, regardless of  how
long  a shareholder  has held  Fund shares, and  are designated  as capital gain
dividends in a written  notice mailed by  the Trust to  the shareholders of  the
Fund  after the close  of the Fund's  taxable year. If  a shareholder receives a
capital gain dividend with respect to any  Fund share, and if the share is  sold
before it has been held by the shareholder for six months or less, then any loss
on  the  sale or  exchange  of the  share,  to the  extent  of the  capital gain
dividend, is treated as a  long-term capital loss. Investors considering  buying
Fund  shares on or just prior to the record date for a distribution of short- or
long-term capital  gains should  be aware  that the  amount of  the  forthcoming
distribution  payment will  be a taxable  distribution payment.  In addition, if
shares of the Fund are purchased within  30 days of redeeming shares at a  loss,
the loss will not be deductible and instead will increase the basis of the newly
purchased shares.
    
 
     If  a  shareholder  fails to  furnish  the  Trust with  a  correct taxpayer
identification number, fails  to report  fully dividend or  interest income,  or
fails  to certify that he or she  has provided a correct taxpayer identification
number and that  he or  she is  not subject  to 'backup  withholding,' then  the
shareholder may be subject to a 31% 'backup withholding' tax with respect to (1)
taxable  dividends and distributions from  the Fund and (2)  the proceeds of any
redemptions of Fund  shares. An individual's  taxpayer identification number  is
his  or  her  social security  number.  The  backup withholding  tax  is  not an
additional tax and may be credited  against a taxpayer's regular federal  income
tax liability.
 
                          DETERMINATION OF PERFORMANCE
 
As noted in the Prospectuses, the Trust, from time to time, may quote the Fund's
performance,  in  terms  of the  classes'  total  returns, in  reports  or other
communications to shareholders  or in  advertising material. To  the extent  any
advertisement  or  sales  literature  of  the  Fund  describes  the  expenses or
performance of any class, it will  also disclose this information for the  other
classes.
 
                                       15
 
<PAGE>
--------------------------------------------------------------------------------
 
     The  30-day yield figure described in  the Prospectuses is calculated for a
class according to a formula prescribed by the SEC, expressed as follows:
 
                             YIELD = 2[( a-b +1)6'pp'-1]
                                         ---
                                          cd
 
<TABLE>
<S>      <C>   <C>   <C>
Where:   a        =  dividends and interest earned during the period.
         b        =  expenses accrued for the period (net of reimbursement).
         c        =  the average daily number of  shares outstanding during the period  that were entitled to  receive
                     dividends.
         d        =  the maximum offering price per share on the last day of the period.
</TABLE>
 
     For  the purposes of  determining the interest earned  (variable 'a' in the
formula) on debt obligations that were purchased  by the Fund, at a discount  or
premium,  the  formula  generally  calls for  amortization  of  the  discount or
premium; the amortization schedule will  be adjusted monthly to reflect  changes
in the market values of the debt obligations.
 
     Investors should recognize that in periods of declining interest rates, the
Fund's  yield will tend to be somewhat  higher than prevailing market rates, and
in periods of rising interest rates will tend to be somewhat lower. In addition,
when interest rates are falling,  the inflow of net new  money to the Fund  from
the  continuous  sale  of its  shares  will  likely be  invested  in instruments
producing lower yields than the balance of its portfolio of securities,  thereby
reducing  the current yield of the Fund. In periods of rising interest rates the
opposite can be expected to occur.
 
     The average annual total return  figures described in the Prospectuses  are
computed  for a class according to a  formula prescribed by the SEC. The formula
can be expressed as follows:
 
                                P(1 + T)n'pp' = ERV
 
<TABLE>
<S>      <C>   <C>   <C>
Where:   P        =  a hypothetical initial payment of $1,000;
         T        =  average annual total return;
         n        =  number of years; and
         ERV      =  Ending Redeemable Value of a hypothetical $1,000 investment made at the beginning of a 1-,  5-
                     or  10-year period at the end of the 1-, 5- or 10-year period (or fractional portion thereof),
                     assuming reinvestment of all dividends and distributions.
</TABLE>
 
     The ERV assumes complete redemption  of the hypothetical investment at  the
end of the measuring period.
 
     The  aggregate total return figures described in the Prospectuses represent
the cumulative change in the value of an investment in shares of a class for the
specified period and are computed by the following formula:
 
                                       16
 
<PAGE>
--------------------------------------------------------------------------------
 
<TABLE>
<S>                       <C>
                                ERV-P
                               -------
AGGREGATE TOTAL RETURN =          P
</TABLE>
 
<TABLE>
<S>      <C>   <C>   <C>
Where:   P        =  a hypothetical initial payment of $1,000; and
         ERV      =  Ending Redeemable Value of a hypothetical $1,000 investment made at the beginning of a 1-,  5-
                     or  10-year period at the end of the 1-, 5- or 10-year period (or fractional portion thereof),
                     assuming reinvestment of all dividends and distributions.
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                                         FINANCIAL
                                                                                        INTERMEDIARY    INSTITUTIONAL
                                                                                           SHARES          SHARES
                                                                                        ------------    -------------
                                                                                                30-DAY YIELD
                                                                                        -----------------------------
 
<S>                                                                                     <C>             <C>
Thirty days ended November 30, 1994..................................................        4.90%           5.16%
 
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                         FINANCIAL
                                                                                        INTERMEDIARY    INSTITUTIONAL
                                                                                           SHARES          SHARES
                                                                                        ------------    -------------
                                                                                         AVERAGE ANNUAL TOTAL RETURN
                                                                                        -----------------------------
 
<S>                                                                                     <C>             <C>
Inception (March 24, 1994) to November 30, 1994......................................        1.50%           1.65%
 
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                         FINANCIAL
                                                                                        INTERMEDIARY    INSTITUTIONAL
                                                                                           SHARES          SHARES
                                                                                        ------------    -------------
                                                                                             ANNUAL TOTAL RETURN
                                                                                        -----------------------------
 
<S>                                                                                     <C>             <C>
Inception (March 24, 1994) to November 30, 1994......................................        1.50%           1.65%
 
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                         FINANCIAL
                                                                                        INTERMEDIARY    INSTITUTIONAL
                                                                                           SHARES          SHARES
                                                                                        ------------    -------------
                                                                                           AGGREGATE TOTAL RETURN
                                                                                        -----------------------------
 
<S>                                                                                     <C>             <C>
Inception (March 24, 1994) to November 30, 1994......................................        1.50%           1.65%
 
</TABLE>
    
 
     Each class' performance will vary from  time to time depending upon  market
conditions,  the  composition  of  its  portfolio  and  its  operating expenses.
Consequently,  any  given  performance   quotation  should  not  be   considered
representative  of a class' performance for  any specified period in the future.
In addition, because each  class' performance fluctuates, it  may not provide  a
basis  for comparing  an investment  in the Fund  with certain  bank deposits or
other investments that pay a fixed yield for a stated period of time.
 
                                       17
 
<PAGE>
--------------------------------------------------------------------------------
 
                              GENERAL INFORMATION
 
   
The Trust was organized  as an unincorporated business  trust under the laws  of
The  Commonwealth  of Massachusetts  pursuant to  a  Declaration of  Trust dated
October 14,  1993,  as amended  from  time  to time  (the  'Declaration').  PFPC
maintains a record of each shareholder's ownership of Fund shares.
    
 
     Massachusetts  law  provides that  shareholders of  the Trust  could, under
certain circumstances,  be held  personally liable  for the  obligations of  the
Trust.  The Declaration disclaims shareholder  liability for acts or obligations
of the Trust, however, and  requires that notice of  the disclaimer be given  in
each  agreement, obligation or instrument entered  into or executed by the Trust
or a  Trustee. The  Declaration provides  for indemnification  from the  Trust's
property  for  all losses  and expenses  of  any shareholder  of the  Trust held
personally liable for the  obligations of the  Trust. Thus, the  risk of a  Fund
shareholder  incurring  financial loss  on account  of shareholder  liability is
limited to  circumstances  in  which the  Trust  would  be unable  to  meet  its
obligations,  a possibility that the Trust's management believes is remote. Upon
payment of  any liability  incurred by  the Trust,  the shareholder  paying  the
liability  will  be entitled  to reimbursement  from the  general assets  of the
Trust. The Trustees intend to conduct the operations of the Trust in such a  way
so  as to avoid, as far as  possible, ultimate liability of the shareholders for
liabilities of the Trust.
 
   
                              FINANCIAL STATEMENTS
    
 
   
The Fund's Annual Report to Shareholders for the fiscal year ended November  30,
1994  is  a  separate  document  supplied  with  this  Statement  of  Additional
Information and  the  financial statements,  accompanying  notes and  report  of
independent  auditors appearing  therein are  incorporated by  reference in this
Statement of Additional Information.
    
 
                                       18
<PAGE>
                      [THIS PAGE INTENTIONALLY LEFT BLANK]
<PAGE>
 
   
<TABLE>
<S>                                               <C>
---------------------------------------------------
CONTENTS
---------------------------------------------------
Investment Objective and Policies                         2
---------------------------------------------------
Management of the Fund                                    7
---------------------------------------------------
Principal Shareholders                                   12
---------------------------------------------------
Purchase and Redemption of Shares                        13
---------------------------------------------------
Determination of Net Asset Value                         14
---------------------------------------------------
Exchange Privilege                                       14
---------------------------------------------------
Taxes
  (See in the Prospectuses 'Dividends,
  Distributions and Taxes')                              14
---------------------------------------------------
Determination of Performance (See in the
  Prospectuses 'Performance Information')                15
---------------------------------------------------
General Information                                      18
---------------------------------------------------
Financial Statements                                     18
---------------------------------------------------
</TABLE>

    
 
<TABLE>
<S>                            <C>
                               INSTITUTIONAL
                                  ADJUSTABLE
                                        RATE
                                  GOVERNMENT
                                   PORTFOLIO
</TABLE>
 
 
   
<TABLE>
<S>                           <C>
                                STATEMENT OF
                                  ADDITIONAL
                                 INFORMATION
 
                              MARCH 28, 1995
 
                              INSTITUTIONAL SHARES
                              FINANCIAL INTERMEDIARY SHARES
</TABLE>
    
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
STATEMENT OF ASSETS AND LIABILITIES AS OF NOVEMBER 30, 1994
--------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                             <C>          <C>
ASSETS
Investments, at value (identified cost-$66,900,675) (Note 1a)................................                $65,993,019
Receivables:
     Interest................................................................................   $448,033
     Paydowns................................................................................     52,503         500,536
                                                                                                --------
Deferred organization expenses (Note 1d).....................................................                    174,884
Prepaid expenses (Note 1e)...................................................................                     36,987
                                                                                                             -----------
                          TOTAL ASSETS.......................................................                 66,705,426
                                                                                                             -----------
LIABILITIES
Payables:
     Shares redeemed.........................................................................    758,802
     Due to custodian........................................................................    650,396
     Dividends (Note 1b).....................................................................     22,399
     Due to manager (Note 2).................................................................     12,124
     Service fees (Note 2)...................................................................      2,559       1,446,280
                                                                                                --------
Accrued expenses.............................................................................                    110,342
                                                                                                             -----------
                          TOTAL LIABILITIES..................................................                  1,556,622
                                                                                                             -----------
NET ASSETS
At value.....................................................................................                $65,148,804
                                                                                                             -----------
                                                                                                             -----------
Net assets were comprised of:
     Aggregate paid-in-capital...............................................................                $66,887,652
     Undistributed net investment income.....................................................                         --
     Net unrealized depreciation on investments..............................................                   (907,656)
     Accumulated net realized capital losses.................................................                   (831,192)
                                                                                                             -----------
Net assets...................................................................................                $65,148,804
                                                                                                             -----------
                                                                                                             -----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                               FINANCIAL
                                                                                             INSTITUTIONAL    INTERMEDIARY
                                                                                                SHARES           SHARES
                                                                                             -------------    ------------
<S>                                                                                          <C>              <C>
Net assets................................................................................    $ 52,017,580    $ 13,131,224
Outstanding shares of beneficial interest, ($.001 par value)..............................       4,403,724       1,111,688
Net asset values per share................................................................          $11.81          $11.81
</TABLE>
 
See Notes to Financial Statements.
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
STATEMENT OF OPERATIONS FOR THE PERIOD MARCH 24, 1994* TO NOVEMBER 30, 1994
--------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                         <C>               <C>
INVESTMENT INCOME
Interest income (net of $168,272, amortization of premiums and discounts) (Note 1c)......                     $4,553,134
EXPENSES
Investment advisory (Note 2).............................................................   $     393,116
Professional.............................................................................          72,000
Federal and state registration...........................................................          36,591
Prospectus and shareholders' reports.....................................................          27,900
Amortization of organization expenses (Note 1d)..........................................          27,104
Servicing -- Financial Intermediary Shares (Note 2)......................................          26,679
Pricing..................................................................................          17,505
Transfer Agent...........................................................................          11,000
Custodian................................................................................           8,800
Trustees' fees and expenses (Note 2).....................................................           7,573
Miscellaneous............................................................................           1,553
                                                                                            -------------
                          TOTAL EXPENSES.................................................         629,821
Expenses absorbed by manager (Note 2)....................................................        (207,288)
                                                                                            -------------
                          NET EXPENSES...................................................                        422,533
                                                                                                              ----------
NET INVESTMENT INCOME....................................................................                      4,130,601
REALIZED AND UNREALIZED LOSS ON INVESTMENTS (NOTE 3)
Realized loss from investment transactions (excluding short-term securities):
     Proceeds from sales.................................................................     162,488,260
     Cost of securities sold.............................................................    (163,319,452)
                                                                                            -------------
Net realized loss on investment transactions.............................................                       (831,192)
Change in unrealized depreciation on securities..........................................                       (907,656)
                                                                                                              ----------
NET INCREASE IN NET ASSETS
Resulting from operations................................................................                     $2,391,753
                                                                                                              ----------
                                                                                                              ----------
</TABLE>
 
*Commencement of Operations.
See Notes to Financial Statements.
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
STATEMENT OF CHANGES IN NET ASSETS
--------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                               MARCH 24, 1994*
                                                                                                                      TO
                                                                                                              NOVEMBER 30, 1994
                                                                                                              ------------------
<S>                                                                                                           <C>
INCREASE IN NET ASSETS FROM OPERATIONS
Net investment income.......................................................................................     $  4,130,601
Net realized loss on investment transactions................................................................         (831,192)
Change in unrealized depreciation on securities.............................................................         (907,656)
                                                                                                              ------------------
          NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS..............................................        2,391,753
                                                                                                              ------------------
DISTRIBUTIONS TO SHAREHOLDERS FROM NET INVESTMENT INCOME (NOTE 1E)
Institutional Shares........................................................................................       (3,641,953)
Financial Intermediary Shares...............................................................................         (488,648)
                                                                                                              ------------------
          TOTAL DISTRIBUTIONS FROM NET INVESTMENT INCOME....................................................       (4,130,601)
                                                                                                              ------------------
CAPITAL SHARE TRANSACTIONS (NOTE 4)
Net proceeds from sale of shares............................................................................      224,767,944
Net asset value of shares issued to shareholders in connection with the reinvestment of dividends...........        2,190,960
Cost of shares redeemed.....................................................................................     (160,171,260)
                                                                                                              ------------------
          NET INCREASE IN NET ASSETS DERIVED FROM CAPITAL SHARE TRANSACTIONS................................       66,787,644
                                                                                                              ------------------
          TOTAL INCREASE IN NET ASSETS......................................................................       65,048,796
NET ASSETS
Beginning of period.........................................................................................          100,008
                                                                                                              ------------------
End of period...............................................................................................     $ 65,148,804
                                                                                                              ------------------
                                                                                                              ------------------
</TABLE>
 
*Commencement of Operations.
See Notes to Financial Statements.
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                                                      FINANCIAL
                                                                                             INSTITUTIONAL          INTERMEDIARY
                                                                                                SHARES                 SHARES
                                                                                           ----------------------------------------
                                                                                            MARCH 24, 1994*        MARCH 24, 1994*
                                                                                                  TO                     TO
                                                                                           NOVEMBER 30, 1994      NOVEMBER 30, 1994
                                                                                           ----------------------------------------
<S>                                                                                        <C>                    <C>
Net asset value, beginning of period.....................................................      $   12.00              $   12.00
                                                                                               ---------              ---------
INCOME FROM INVESTMENT OPERATIONS
Net investment income....................................................................           0.39                   0.37
Net realized and unrealized losses on investments........................................          (0.19)                 (0.19)
                                                                                               ---------              ---------
Total from investment operations.........................................................           0.20                   0.18
                                                                                               ---------              ---------
DISTRIBUTIONS TO SHAREHOLDERS FROM (NOTE 1E)
Net investment income....................................................................          (0.39)                 (0.37)
                                                                                               ---------              ---------
Net asset value, end of period...........................................................      $   11.81              $   11.81
                                                                                               ---------              ---------
                                                                                               ---------              ---------
Total return (Annualized)#...............................................................          2.39%                  2.00%
RATIOS/SUPPLEMENTAL DATA
Net assets, end of period (in thousands).................................................      $  52,018              $  13,131
RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
Expenses, excluding distribution fees, net of reimbursement..............................          0.46%                  0.46%
Expenses, including distribution fees, net of reimbursement..............................          0.46%                  0.67%
Expenses, before reimbursement from manager..............................................          0.69%                  0.94%
Net investment income....................................................................          4.75%                  4.54%
PORTFOLIO TURNOVER RATE..................................................................        170.25%                170.25%
</TABLE>
 
* Commencement of Operations.
# Total return does not reflect the effects of a sales charge, and is calculated
  by giving effect to the reinvestment of dividends on the dividend payment
  date.
See Notes to Financial Statements.
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS
--------------------------------------------------------------------------------
 
1.  The Fund is  a series of  Institutional Series Trust  (the 'Trust') which is
registered under the Investment Company Act  of 1940 as a diversified,  open-end
management  company. Currently the Fund is the only series offered by the Trust.
The Fund commenced operations on March  24, 1994. The Fund offers investors  the
choice  of  investing  in two  separate  classes of  shares  representing equal,
pro-rata interests in  its investment  portfolio --  'Institutional' shares  and
'Financial  Intermediary' shares. Financial Intermediary shares are identical in
all respects to Institutional shares except that beneficial owners of  Financial
Intermediary   shares   receive   certain  services   directly   from  financial
intermediaries, bear certain  service fees  and enjoy  certain exclusive  voting
rights  on  matters relating  to these  services  and fees.  The following  is a
summary of significant accounting policies consistently followed by the Fund.
 
   (a) Generally, the Fund's investments are  valued at market value or, in  the
absence of a market value, at fair value as determined by or under the direction
of  the  Trustees. Investments  in  Government Securities  and  other securities
traded over-the-counter, other  than short-term  investments that  mature in  60
days  or less, are valued at  the average of the quoted  bid and asked prices in
the over-the-counter market. Short-term  investments that mature  in 60 days  or
less are valued on the basis of amortized cost when the Trustees have determined
that  amortized cost represents fair value.  A security that is primarily traded
on a stock exchange is valued at the last sale price on that exchange or, if  no
sales  occurred during  the day, at  the quoted  bid price. In  carrying out the
Trustees' valuation policies, the Fund  may consult with an independent  pricing
service.
 
   (b)  It is the Fund's policy to  comply with the requirements of the Internal
Revenue Code  applicable to  regulated investment  companies and  to  distribute
substantially  all of its taxable income to its shareholders. Distributions, for
purposes of maintaining regulated investment company status, are recognized on a
Fund level, rather than  a class level, under  the requirements of the  Internal
Revenue Code. Therefore, no Federal income tax provision is required.
 
   (c) Security transactions are recorded on a trade date basis. Interest income
is  earned  from  settlement  date  and  is  recognized  on  an  accrual  basis.
Distributions to shareholders are  recorded on the  ex-dividend dates. The  Fund
amortizes  premium  and accretes  discount using  the interest  method. Realized
gains and losses on security transactions are determined on the identified  cost
basis.
 
   (d) Prepaid registration fees are charged to income as the related shares are
issued. Organization costs are being amortized evenly over a sixty month period.
 
   (e)  Income and Fund level expenses are allocated to each class on a pro-rata
basis based upon each class' daily  settled net assets. Class specific  expenses
are  charged directly  to each class.  Dividends from net  investment income are
calculated daily  based  upon  the respective  classes  net  investment  income.
Distributions  from net realized gains are  allocated based upon the outstanding
shares of each class.
 
   The Fund distributes monthly substantially all its net investment income. Net
long-term realized gains, if any, will be distributed annually. At November  30,
1994,  the Fund had accumulated net realized capital losses of $831,192 for book
purposes.
 
2. The Fund has entered into a Management and Investment Advisory Agreement with
Kidder Peabody Asset  Management, Inc.  ('KPAM'), a  wholly-owned subsidiary  of
Kidder,  Peabody & Co.  Incorporated ('KP'). General  Electric Capital Services,
Inc., a wholly-owned subsidiary of General Electric Company, has a 100% interest
in Kidder, Peabody Group Inc., the parent company of KP. KPAM is responsible for
the management of  the Fund's  portfolio and provides  the necessary  personnel,
facilities,  equipment, and  other services necessary  to the  operations of the
Fund. Fees paid by  the Fund for such  services are payable monthly,  calculated
and  accrued daily by applying an annual rate of  .45 of 1% to the net assets of
the Fund  as determined  as of  the close  of business  each day.  Total  annual
expenses of the Fund, exclusive of taxes, interest, all brokers' commissions and
other   normal  charges  incidental  to  the  purchase  and  sale  of  portfolio
securities, but including  fees paid  to KPAM, are  not expected  to exceed  the
limits  prescribed by any state in which the Fund's shares are offered for sale,
and KPAM will reimburse the Fund for  any expenses in excess of such limits.  No
expense  reimbursement  was required  for the  period  ended November  30, 1994,
however, KPAM voluntarily reimbursed the Fund for a portion of its expenses.
 
   KP is the exclusive  distributor of the Fund's  shares. Its services  include
payment  of sales  commissions to  registered representatives  and various other
promotional and
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS
--------------------------------------------------------------------------------
sales-related expenses.  KP receives  monthly, from  the Financial  Intermediary
shares, service fees which are calculated and accrued daily.
 
   Certain officers and/or Trustees of the Fund are officers and/or directors of
KPAM.  Each Trustee who is not an  'affiliated person' receives an annual fee of
$1,000 and an attendance fee of $375 per meeting.
 
3. Purchases  and  sales  of securities,  excluding  short-term  securities  and
maturities,  for  the  period  ended November  30,  1994  were  $230,238,527 and
$162,488,260, respectively. As of November 30, 1994 net unrealized  depreciation
on  investments,  based  on cost  for  Federal income  tax  purposes, aggregated
$907,656, all of which related to depreciated securities. The aggregate cost  of
securities  at November 30, 1994, for book  and Federal income tax purposes, was
$66,900,675.
 
4. The  Declaration of  Trust  of the  Fund permits  the  Trustees to  issue  an
unlimited  number of shares  of beneficial interest, par  value $.001 per share.
Transactions totaling  $224,767,944  from  net proceeds  from  sale  of  shares,
$160,171,260 representing cost of shares redeemed and $2,190,960 reinvestment of
dividends for the period ended November 30, 1994 as follows for each class:
 
<TABLE>
<CAPTION>
INSTITUTIONAL SHARES             SHARES           AMOUNT
-----------------------------------------------------------
<S>                            <C>             <C>
For the period March 24, 1994*
  to November 30, 1994:
Shares sold...................  16,853,030     $202,045,773
Shares issued to shareholders
  in connection with the
  reinvestment of dividends...     175,059        2,094,308
Shares redeemed............... (12,624,365)    (150,714,269)
                               ----------------------------
     NET INCREASE.............   4,403,724     $ 53,425,812
                               ----------------------------
                               ----------------------------
 
FINANCIAL INTERMEDIARY SHARES    SHARES           AMOUNT
-----------------------------------------------------------
For the period March 24, 1994*
  to November 30, 1994:
Shares sold...................   1,895,496     $ 22,722,171
Shares issued to shareholders
  in connection with the
  reinvestment of dividends...       8,105           96,652
Shares redeemed...............    (791,913)      (9,456,991)
                               ----------------------------
     NET INCREASE.............   1,111,688     $ 13,361,832
                               ----------------------------
                               ----------------------------
</TABLE>
 
5.  The Fund takes  possession of securities  under repurchase agreements before
releasing  any  money  to  the  counterparty  under  such  agreement.   Eligible
collateral  for repurchase agreement  transactions are the  instruments that the
Fund is allowed to invest in, as stated in the Prospectus. The Fund attempts  to
attain  a  short  maturity  (2  years or  less),  although  that  is  not always
available. The value of the collateral must  be a minimum of 102% of the  market
value of the securities being loaned, allowing for minor variations arising from
marking  to market of such collateral. If  the issuer defaults, or if bankruptcy
or regulatory  proceedings  are  commenced  with  respect  to  the  issuer,  the
realization  of the proceeds may  be delayed or limited.  The shares of the Fund
are not guaranteed by the U.S. Government.
 
6. Under an agreement dated as of October 17, 1994, General Electric Company has
agreed to sell to PaineWebber Group, Inc. certain assets of Kidder Group and its
subsidiaries, including certain assets of  Kidder and KPAM. The consummation  of
this  transaction, which  is subject  to a  number of  conditions and  cannot be
assured, will result in the deemed  assignment and automatic termination of  the
agreements  pursuant to which Kidder serves  as the principal underwriter of the
Fund's shares and  KPAM serves  as the  Fund's manager  and investment  adviser.
Continuation of the Fund's relationship with Kidder and KPAM or their successors
following  the  consummation of  the transaction  will  require approval  of the
Trustees and the separate approval of the  majority of the Trustees who are  not
'interested  persons' of the  Fund within the  meaning of the  Act. In addition,
continuation of the Fund's  management arrangements will  require approval of  a
'majority  of the outstanding voting securities' of  the Fund, as defined in the
Act. No assurance can be given that any of the foregoing required approvals will
be obtained and,  if they  are not,  the Trustees will  take such  action as  it
determines  to be  appropriate and  in the  best interests  of the  Fund and its
shareholders.
 
*Commencement of Operations.
 
<PAGE>
Institutional Adjustable Rate Government Portfolio
--------------------------------------------------------------------------------
REPORT OF INDEPENDENT AUDITORS
--------------------------------------------------------------------------------
 
The Trustees and Shareholders,
Institutional Adjustable Rate Government Portfolio
of Institutional Series Trust:
 
We have audited the accompanying statement of assets and liabilities,  including
the  schedule  of  investments,  of  Institutional  Adjustable  Rate  Government
Portfolio of Institutional Series  Trust (the 'Fund') as  of November 30,  1994,
and the related statement of operations, changes in net assets and the financial
highlights  for the period  from March 24, 1994  (commencement of operations) to
November 30, 1994. These financial  statements and financial highlights are  the
responsibility  of the  Fund's management. Our  responsibility is  to express an
opinion on these financial statements and the financial highlights based on  our
audit.
We conducted our audit in accordance with generally accepted auditing standards.
Those  standards require that we plan and perform the audit to obtain reasonable
assurance about whether  the financial statements  and financial highlights  are
free  of material  misstatement. An audit  includes examining, on  a test basis,
evidence supporting the amounts and disclosures in the financial statements. Our
procedures included confirmation of securities owned as of November 30, 1994  by
correspondence  with  the  custodian.  An  audit  also  includes  assessing  the
accounting principles used and significant estimates made by management, as well
as evaluating the overall financial statement presentation. We believe that  our
audit provides a reasonable basis for our opinion.
In  our  opinion, such  financial  statements and  financial  highlights present
fairly, in  all  material  respects, the  financial  position  of  Institutional
Adjustable  Rate  Government  Portfolio  of  Institutional  Series  Trust  as of
November 30, 1994, the results of its operations, the changes in its net  assets
and  the  financial  highlights  for the  period  presented  in  conformity with
generally accepted accounting principles.
 
Deloitte & Touche LLP
New York, New York
December 30, 1994
<PAGE>
                                     PART C
                               OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS
 
     (a) Financial Statements:
 
          Included in Part A:
 
   
             Financial  Highlights for Financial Intermediary shares of the Fund
        for the period from March 24, 1994 (commencement of operations)  through
        November 30, 1994.
    
 
   
             Financial  Highlights for Institutional shares  of the Fund for the
        period from March 24, 1994 (commencement of operations) through November
        30, 1994.
    
 
   
          Included through incorporation by reference  in Part B and filed  with
     the  Annual  Report  to  Shareholders  with  the  Securities  and  Exchange
     Commission on or  about January  30, 1995  [File No.  811-8080], and  filed
     herewith as an attachment:
    
 
   
             Schedule of Investments as of November 30, 1994.
    
 
   
             Statement of Assets and Liabilities as of November 30, 1994.
    
 
   
             Statement  of  Operations  from  March  24,  1994  (commencement of
        operations) through November 30, 1994.
    
 
   
             Statement  of  Changes   in  Net   Assets  from   March  24,   1994
        (commencement of operations) to November 30, 1994.
    
 
   
             Financial   Highlights  for   the  period   from  March   24,  1994
        (commencement of operations) to November 30, 1994.
    
 
     (b) Exhibits:
 
   
<TABLE>
<CAPTION>
EXHIBIT NO.                                             DESCRIPTION OF EXHIBIT
-----------   -----------------------------------------------------------------------------------------------------------
 
<S>           <C>
    1         -- Declaration of Trust*
    2         -- By-Laws*
    3         -- Inapplicable
    4         -- Forms of certificates for shares of beneficial interest*
    5         -- Form of Investment Advisory and Administration Agreement**
    6         -- Form of Distribution Agreement**
    7         -- Inapplicable
    8         -- Form of Custody Contract with Investors Fiduciary Trust Company*
    9         -- Form of Transfer Agency Agreement with PFPC Inc.**
   10         -- Opinion of Willkie Farr & Gallagher, including consent*
   11         -- Consent of Independent Auditors
   12         -- Inapplicable
   13         -- Form of Purchase Agreement*
   14         -- Inapplicable
   15(a)      -- Form of Shareholder Services Plan**
   15(b)      -- Form of Shareholder Service Agreement**
   16         -- The schedule for computation of each performance quotation provided in the Registration Statement in
                response to Item 22.*
</TABLE>
    
 
------------
 
 * Previously filed
 
   
**To be supplied by amendment
    
 
                                      C-1
 
<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
 
   
<TABLE>
<CAPTION>
                                                NUMBER OF RECORD
            TITLE OF CLASS                HOLDERS AS OF MARCH 20, 1995
--------------------------------------   -------------------------------
 
<S>                                      <C>
Shares representing beneficial
  interests, par value $.001 per
  share:
  Institutional shares                                  14
  Financial Intermediary shares                          2
</TABLE>
    
 
ITEM 27. INDEMNIFICATION
 
     Reference is made to Article IV of Registrant's Declaration of Trust  filed
as  Exhibit 1  to this  Registration Statement.  Insofar as  indemnification for
liability arising under the Securities Act of 1933, as amended (the  'Securities
Act'),  may  be  permitted for  Trustees,  officers and  controlling  persons of
Registrant pursuant  to  provisions of  Registrant's  Declaration of  Trust,  or
otherwise,  Registrant has been  advised that, in the  opinion of the Securities
and Exchange  Commission,  such  indemnification is  against  public  policy  as
expressed  in the Securities Act and  is, therefore, unenforceable. In the event
that a  claim  for indemnification  against  such liabilities  (other  than  the
payment  by Registrant of  expenses incurred or  paid by a  Trustee, officer, or
controlling person of Registrant in the  successful defense of any action,  suit
or  proceeding) is  asserted by such  Trustee, officer or  controlling person in
connection with the securities being registered, 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 Securities
Act and will be governed by the final adjudication of such issue.
 
   
    
   
ITEM 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER
    
 
   
     Mitchell Hutchins Asset Management  Inc. ('Mitchell Hutchins'), a  Delaware
corporation, is a registered investment adviser and is a wholly owned subsidiary
of PaineWebber Inc. ('PaineWebber') which is, in turn, a wholly owned subsidiary
of  Paine  Webber  Group Inc.  Mitchell  Hutchins  is primarily  engaged  in the
investment advisory business. Information  as to the  officers and directors  of
Mitchell  Hutchins is included in its Form ADV filed on August 22, 1994 with the
Securities and  Exchange  Commission  (registration  number  801-13219)  and  is
incorporated herein by reference.
    
 
   
ITEM 29. PRINCIPAL UNDERWRITERS
    
 
   
     (a)  Mitchell Hutchins  serves as  principal underwriter  and/or investment
adviser for the following investment companies:
    
 
   
        All-American Term Trust Inc.
        Global Income Plus Fund, Inc.
        Institutional Series Trust
        Mitchell Hutchins/Kidder, Peabody Equity Income Fund, Inc.
        Mitchell Hutchins/Kidder, Peabody Government Income Fund, Inc.
        Mitchell Hutchins/Kidder, Peabody Investment Trust
        Mitchell Hutchins/Kidder, Peabody Investment Trust II
        Mitchell Hutchins/Kidder, Peabody Investment Trust III
        PaineWebber America Fund
        PaineWebber Atlas Fund
        PaineWebber Investment Series
        PaineWebber Managed Assets Trust
        PaineWebber Managed Investments Trust
        PaineWebber Master Series, Inc.
    
 
                                      C-2
 
<PAGE>
   
        PaineWebber Municipal Series
        PaineWebber Mutual Fund Trust
        PaineWebber Olympus Fund
        PaineWebber Premier High Income Trust Inc.
        PaineWebber Premier Insured Municipal Income Fund Inc.
        PaineWebber Premier Tax-Free Income Fund Inc.
        PaineWebber Regional Financial Growth Fund Inc.
        PaineWebber Securities Trust
        PaineWebber Series Trust
        Strategic Global Income Fund, Inc.
        Triple A and Government Series -- 1995, Inc.
        Triple A and Government Series -- 1997, Inc.
        2002 Target Term Trust Inc.
        Global High Income Dollar Fund Inc.
        Global Small Cap Fund Inc.
    
 
   
     (b)  Mitchell   Hutchins  is   the  Registrant's   principal   underwriter.
PaineWebber  acts as exclusive dealer of  the Registrant's shares. The directors
and officers of Mitchell Hutchins, their principal business addresses, and their
positions and offices  with Mitchell  Hutchins are  identified in  its Form  ADV
filed  August 22, 1994 with the Securities and Exchange Commission (registration
number 801-13219). The  directors and officers  of PaineWebber, their  principal
business  addresses,  and  their  positions  and  offices  with  PaineWebber are
identified in its Form ADV filed March 31, 1994 with the Securities and Exchange
Commission (registration number 801-7163).  The foregoing information is  hereby
incorporated  herein by reference. The information  set forth below is furnished
for those directors and  officers of Mitchell Hutchins  or PaineWebber who  also
serve as trustees or officers of the Registrant:
    
 
   
<TABLE>
<CAPTION>
                                                                                 POSITION AND OFFICES WITH
 NAME AND PRINCIPAL BUSINESS ADDRESS       POSITION WITH REGISTRANT           UNDERWRITER OR EXCLUSIVE DEALER
-------------------------------------  --------------------------------  -----------------------------------------
<S>                                    <C>                               <C>
Frank P.L. Minard                      President                         Director and Chairman of Mitchell
  1285 Avenue of the Americas                                              Hutchins
  New York, New York 10019
Teresa M. Boyle                        Vice President                    First Vice President and
  1285 Avenue of the Americas                                              Manager -- Advisory Administration of
  New York, New York 10019                                                 Mitchell Hutchins
Dennis L. McCauley                     Vice President                    Managing Director and Chief Investment
  1285 Avenue of the Americas                                              Officer -- Fixed Income of Mitchell
  New York, New York 10019                                                 Hutchins
Ann E. Moran                           Vice President and Assistant      Vice President of Mitchell Hutchins
  1285 Avenue of the Americas            Treasurer
  New York, New York 10019
Dianne E. O'Donnell                    Vice President and Secretary      Senior Vice President and Senior
  1285 Avenue of the Americas                                              Associate General Counsel of Mitchell
  New York, New York 10019                                                 Hutchins
Victoria E. Schonfeld                  Vice President                    Managing Director and General Counsel of
  1285 Avenue of the Americas                                              Mitchell Hutchins
  New York, New York 10019
Paul H. Schubert                       Vice President and Assistant      Vice President of Mitchell Hutchins
  1285 Avenue of the Americas            Treasurer
  New York, New York 10019
Nirmal Singh                           Vice President                    Vice President of Mitchell Hutchins
  1285 Avenue of the Americas
  New York, New York 10019
Martha J. Slezak                       Vice President and Assistant      Vice President of Mitchell Hutchins
  1285 Avenue of the Americas            Treasurer
  New York, New York 10019
</TABLE>
    
 
                                      C-3
 
<PAGE>
 
   
<TABLE>
<CAPTION>
                                                                                 POSITION AND OFFICES WITH
 NAME AND PRINCIPAL BUSINESS ADDRESS       POSITION WITH REGISTRANT           UNDERWRITER OR EXCLUSIVE DEALER
-------------------------------------  --------------------------------  -----------------------------------------
<S>                                    <C>                               <C>
Julian F. Sluyters                     Vice President and Treasurer      Senior Vice President and Director of
  1285 Avenue of the Americas                                              Mutual Fund Finance Division of
  New York, New York 10019                                                 Mitchell Hutchins
Gregory K. Todd                        Vice President and Assistant      First Vice President and Associate
  1285 Avenue of the Americas            Secretary                         General Counsel of Mitchell Hutchins
  New York, New York 10019
</TABLE>
    
 
   
     (c) None.
    
 
ITEM 30. LOCATION OF ACCOUNTS AND RECORDS
 
   
     All  accounts,  books  and other  documents  required to  be  maintained by
Registrant pursuant to Section 31(a) of  the Investment Company Act of 1940,  as
amended  (the  '1940 Act'),  and  the rules  thereunder,  are maintained  at the
offices of:  PFPC  Inc.,  400  Bellevue  Parkway,  Wilmington,  Delaware  19809,
Investors  Fiduciary Trust Company, 127 West  10th Street, Kansas City, Missouri
64105, and the Fund, 1285 Avenue of the Americas, New York, New York 10019.
    
 
ITEM 31. MANAGEMENT SERVICES
 
     Inapplicable.
 
ITEM 32. UNDERTAKINGS
 
     Registrant undertakes to call a meeting of its shareholders for the purpose
of voting upon the question  of removal of a  trustee or trustees of  Registrant
when  requested  in  writing  to  do  so by  the  holders  of  at  least  10% of
Registrant's outstanding shares and, in  connection with the meeting, to  comply
with  the provisions of Section 16(c) of the 1940 Act relating to communications
with the shareholders of certain common-law trusts.
 
   
                                      C-4
    
<PAGE>
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, as amended, and
the  Investment Company Act of 1940, as  amended, the Registrant has duly caused
this Post-Effective Amendment to its Registration Statement to be signed on  its
behalf  by the undersigned, thereunto duly authorized, in this City of New York,
and State of New York, on the 28th day of March, 1995.
    
 
   
                                                INSTITUTIONAL SERIES TRUST
                                          By:        /s/ FRANK P.L. MINARD
                                             ...................................
                                                     FRANK P.L. MINARD,
                                                         PRESIDENT
    
 
     Pursuant to the  requirements of the  Securities Act of  1933, as  amended,
this Post-Effective Amendment to the Registrant's Registration Statement on Form
N-1A has been signed below by the following persons in the capacities and on the
dates indicated.
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                      TITLE                               DATE
-----------------------------------------  ----------------------------------------------   ------------------
 
<S>                                        <C>                                              <C>
          /s/ FRANK P.L. MINARD            President (Chief Executive Officer)                March 28, 1995
 ........................................
            FRANK P.L. MINARD
 
         /s/ JULIAN F. SLUYTERS            Vice President and Treasurer (Chief Financial      March 28, 1995
 ........................................    and Accounting Officer)
           JULIAN F. SLUYTERS
 
                    *                      Trustee                                            March 28, 1995
 ........................................
            DAVID J. BEAUBIEN
 
                    *                      Trustee                                            March 28, 1995
 ........................................
         WILLIAM W. HEWITT, JR.
 
                    *                      Trustee                                            March 28, 1995
 ........................................
            THOMAS R. JORDAN
 
                    *                      Trustee                                            March 28, 1995
 ........................................
             CARL W. SCHAFER
 
      *By:  /s/ DIANNE E. O'DONNELL
 ........................................
           DIANNE E. O'DONNELL
            ATTORNEY-IN-FACT
</TABLE>
    
 
                                      C-5
<PAGE>
   
                               POWER OF ATTORNEY
    
 
   
     I,  Thomas R. Jordan, Trustee of PaineWebber/Kidder, Peabody California Tax
Exempt  Money   Fund,   PaineWebber/Kidder,  Peabody   Premium   Account   Fund,
PaineWebber/Kidder,    Peabody   Municipal   Money   Market   Series,   Mitchell
Hutchins/Kidder, Peabody  Investment  Trust, Mitchell  Hutchins/Kidder,  Peabody
Investment  Trust II,  Mitchell Hutchins/Kidder,  Peabody Investment  Trust III,
Institutional Series Trust, and Liquid Institutional Reserves (collectively, the
'Funds'), hereby  constitute  and  appoint  Victoria  E.  Schonfeld,  Dianne  E.
O'Donnell, Gregory K. Todd and Scott Griff, and each of them singly, my true and
lawful  attorneys, with full power to them to sign for me, and in my capacity as
Trustee for each of the Funds, any and all amendments to each of the  particular
registration statements of the Funds, and all instruments necessary or desirable
in  connection  therewith, filed  with the  Securities and  Exchange Commission,
hereby ratifying  and  confirming my  signature  as it  may  be signed  by  said
attorneys to any and all amendments to said registration statements.
    
 
   
     Pursuant to the requirements of the Securities Act of 1933, this instrument
has  been  signed  below  by the  following  in  the capacity  and  on  the date
indicated.
    
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                         TITLE                               DATE
-----------------------------------------  ---------------------------------------------------   ---------------
 
<S>                                        <C>                                                   <C>
          /s/ THOMAS R. JORDAN                                   Trustee                          March 8, 1995
 ........................................
            THOMAS R. JORDAN
</TABLE>
    
 
<PAGE>
   
                               POWER OF ATTORNEY
    
 
   
     I, David J. Beaubien, Trustee of PaineWebber/Kidder, Peabody California Tax
Exempt  Money   Fund,   PaineWebber/Kidder,  Peabody   Premium   Account   Fund,
PaineWebber/Kidder,    Peabody   Municipal   Money   Market   Series,   Mitchell
Hutchins/Kidder, Peabody  Investment  Trust, Mitchell  Hutchins/Kidder,  Peabody
Investment  Trust II,  Mitchell Hutchins/Kidder,  Peabody Investment  Trust III,
Institutional Series Trust, and Liquid Institutional Reserves (collectively, the
'Funds'), hereby  constitute  and  appoint  Victoria  E.  Schonfeld,  Dianne  E.
O'Donnell, Gregory K. Todd and Scott Griff, and each of them singly, my true and
lawful  attorneys, with full power to them to sign for me, and in my capacity as
Trustee for each of the Funds, any and all amendments to each of the  particular
registration statements of the Funds, and all instruments necessary or desirable
in  connection  therewith, filed  with the  Securities and  Exchange Commission,
hereby ratifying  and  confirming my  signature  as it  may  be signed  by  said
attorneys to any and all amendments to said registration statements.
    
 
   
     Pursuant to the requirements of the Securities Act of 1933, this instrument
has  been  signed  below  by the  following  in  the capacity  and  on  the date
indicated.
    
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                         TITLE                               DATE
-----------------------------------------  ---------------------------------------------------   ---------------
 
<S>                                        <C>                                                   <C>
          /s/ DAVID J. BEAUBIEN                                  Trustee                          March 8, 1995
 ........................................
            DAVID J. BEAUBIEN
</TABLE>
    
 
<PAGE>
   
                               POWER OF ATTORNEY
    
 
   
     I,  William  W.  Hewitt,   Jr.,  Trustee  of  PaineWebber/Kidder,   Peabody
California  Tax Exempt  Money Fund, PaineWebber/Kidder,  Peabody Premium Account
Fund,  PaineWebber/Kidder,  Peabody  Municipal  Money  Market  Series,  Mitchell
Hutchins/Kidder,  Peabody  Investment Trust,  Mitchell  Hutchins/Kidder, Peabody
Investment Trust  II, Mitchell  Hutchins/Kidder, Peabody  Investment Trust  III,
Institutional Series Trust, and Liquid Institutional Reserves (collectively, the
'Funds'),  hereby  constitute  and  appoint  Victoria  E.  Schonfeld,  Dianne E.
O'Donnell, Gregory K. Todd and Scott Griff, and each of them singly, my true and
lawful attorneys, with full power to them to sign for me, and in my capacity  as
Trustee  for each of the Funds, any and all amendments to each of the particular
registration statements of the Funds, and all instruments necessary or desirable
in connection  therewith, filed  with the  Securities and  Exchange  Commission,
hereby  ratifying  and confirming  my  signature as  it  may be  signed  by said
attorneys to any and all amendments to said registration statements.
    
 
   
     Pursuant to the requirements of the Securities Act of 1933, this instrument
has been  signed  below  by the  following  in  the capacity  and  on  the  date
indicated.
    
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                         TITLE                               DATE
-----------------------------------------  ---------------------------------------------------   ---------------
 
<S>                                        <C>                                                   <C>
       /s/ WILLIAM W. HEWITT, JR.                                Trustee                          March 8, 1995
 ........................................
         WILLIAM W. HEWITT, JR.
</TABLE>
    
 
<PAGE>
   
                               POWER OF ATTORNEY
    
 
   
     I,  Carl W. Schafer, Trustee  of PaineWebber/Kidder, Peabody California Tax
Exempt  Money   Fund,   PaineWebber/Kidder,  Peabody   Premium   Account   Fund,
PaineWebber/Kidder,    Peabody   Municipal   Money   Market   Series,   Mitchell
Hutchins/Kidder, Peabody  Investment  Trust, Mitchell  Hutchins/Kidder,  Peabody
Investment  Trust II,  Mitchell Hutchins/Kidder,  Peabody Investment  Trust III,
Institutional Series Trust, and Liquid Institutional Reserves (collectively, the
'Funds'), hereby  constitute  and  appoint  Victoria  E.  Schonfeld,  Dianne  E.
O'Donnell, Gregory K. Todd and Scott Griff, and each of them singly, my true and
lawful  attorneys, with full power to them to sign for me, and in my capacity as
Trustee for each of the Funds, any and all amendments to each of the  particular
registration statements of the Funds, and all instruments necessary or desirable
in  connection  therewith, filed  with the  Securities and  Exchange Commission,
hereby ratifying  and  confirming my  signature  as it  may  be signed  by  said
attorneys to any and all amendments to said registration statements.
    
 
   
     Pursuant to the requirements of the Securities Act of 1933, this instrument
has  been  signed  below  by the  following  in  the capacity  and  on  the date
indicated.
    
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                         TITLE                               DATE
-----------------------------------------  ---------------------------------------------------   ---------------
 
<S>                                        <C>                                                   <C>
           /s/ CARL W. SCHAFER                                   Trustee                          March 8, 1995
 ........................................
             CARL W. SCHAFER
</TABLE>
    


<PAGE>

                          STATEMENT OF DIFFERENCES

Alpha or numeric characters that represent mathematical powers shall be
immediately followed by 'pp'.





<PAGE>
   

                      CONSENT OF INDEPENDENT AUDITORS


Institutional Adjustable Rate Government Portfolio
of Institutional Series Trust:

We consent to the incorporation by reference in the Statement of Additional
Information in this Post-Effective Amendment No. 2 to Registration Statement
No. 33-70362 of our report dated December 30, 1994, appearing in the annual
report to shareholders for the year ended November 30, 1994, and to the
references to us under the captions "Independent Auditors" appearing in
the Statement of Additional Information and "Financial Highlights" appearing
in the Prospectus, which also are a part of such Registration Statement.

Deloitte & Touche LLP
New York, New York
March 27, 1995
    




<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         913604
<NAME>                        INSTITUTIONAL SERIES TRUST
<SERIES>
<NUMBER>                      101
<NAME>                       INSTITUTIONAL ADJUSTABLE RATE GOVERNMENT PORTFOLIO
                                 - CLASS A
       
<S>                                                                          <C>
<PERIOD-TYPE>                                                                 9-MOS
<FISCAL-YEAR-END>                                                       NOV-30-1994
<PERIOD-START>                                                          MAR-24-1994
<PERIOD-END>                                                            NOV-30-1994
<INVESTMENTS-AT-COST>                                                    53,416,348
<INVESTMENTS-AT-VALUE>                                                   52,691,637
<RECEIVABLES>                                                               399,649
<ASSETS-OTHER>                                                              169,167
<OTHER-ITEMS-ASSETS>                                                              0
<TOTAL-ASSETS>                                                           53,260,453
<PAYABLE-FOR-SECURITIES>                                                          0
<SENIOR-LONG-TERM-DEBT>                                                           0
<OTHER-ITEMS-LIABILITIES>                                                 1,242,873
<TOTAL-LIABILITIES>                                                       1,242,873
<SENIOR-EQUITY>                                                                   0
<PAID-IN-CAPITAL-COMMON>                                                 53,405,950
<SHARES-COMMON-STOCK>                                                     4,403,724
<SHARES-COMMON-PRIOR>                                                             0
<ACCUMULATED-NII-CURRENT>                                                         0
<OVERDISTRIBUTION-NII>                                                            0
<ACCUMULATED-NET-GAINS>                                                   (663,659)
<OVERDISTRIBUTION-GAINS>                                                          0
<ACCUM-APPREC-OR-DEPREC>                                                  (724,711)
<NET-ASSETS>                                                             52,017,580
<DIVIDEND-INCOME>                                                                 0
<INTEREST-INCOME>                                                         3,635,416
<OTHER-INCOME>                                                                    0
<EXPENSES-NET>                                                            (337,368)
<NET-INVESTMENT-INCOME>                                                   3,298,048
<REALIZED-GAINS-CURRENT>                                                  (663,659)
<APPREC-INCREASE-CURRENT>                                                 (724,711)
<NET-CHANGE-FROM-OPS>                                                     1,909,678
<EQUALIZATION>                                                                    0
<DISTRIBUTIONS-OF-INCOME>                                               (3,641,953)
<DISTRIBUTIONS-OF-GAINS>                                                          0
<DISTRIBUTIONS-OTHER>                                                             0
<NUMBER-OF-SHARES-SOLD>                                                 202,045,773
<NUMBER-OF-SHARES-REDEEMED>                                           (150,714,269)
<SHARES-REINVESTED>                                                       2,094,308
<NET-CHANGE-IN-ASSETS>                                                   51,693,537
<ACCUMULATED-NII-PRIOR>                                                           0
<ACCUMULATED-GAINS-PRIOR>                                                         0
<OVERDISTRIB-NII-PRIOR>                                                           0
<OVERDIST-NET-GAINS-PRIOR>                                                        0
<GROSS-ADVISORY-FEES>                                                       313,881
<INTEREST-EXPENSE>                                                                0
<GROSS-EXPENSE>                                                             502,876
<AVERAGE-NET-ASSETS>                                                    110,936,579
<PER-SHARE-NAV-BEGIN>                                                         12.00
<PER-SHARE-NII>                                                                 .39
<PER-SHARE-GAIN-APPREC>                                                       (.19)
<PER-SHARE-DIVIDEND>                                                          (.39)
<PER-SHARE-DISTRIBUTIONS>                                                         0
<RETURNS-OF-CAPITAL>                                                              0
<PER-SHARE-NAV-END>                                                           11.81
<EXPENSE-RATIO>                                                                 .69
<AVG-DEBT-OUTSTANDING>                                                            0
<AVG-DEBT-PER-SHARE>                                                              0
        
 






<TABLE> <S> <C>

<ARTICLE>                     6
<CIK>                         913604
<NAME>                        INSTITUTIONAL SERIES TRUST
<SERIES>
<NUMBER>                      102
<NAME>                       INSTITUTIONAL ADJUSTABLE RATE GOVERNMENT PORTFOLIO
                                 - CLASS B
       
<S>                                                                          <C>
<PERIOD-TYPE>                                                                 9-MOS
<FISCAL-YEAR-END>                                                       NOV-30-1994
<PERIOD-START>                                                          MAR-24-1994
<PERIOD-END>                                                            NOV-30-1994
<INVESTMENTS-AT-COST>                                                    13,484,327
<INVESTMENTS-AT-VALUE>                                                   13,301,382
<RECEIVABLES>                                                               100,887
<ASSETS-OTHER>                                                               42,704
<OTHER-ITEMS-ASSETS>                                                              0
<TOTAL-ASSETS>                                                           13,444,973
<PAYABLE-FOR-SECURITIES>                                                          0
<SENIOR-LONG-TERM-DEBT>                                                           0
<OTHER-ITEMS-LIABILITIES>                                                   313,749
<TOTAL-LIABILITIES>                                                         313,749
<SENIOR-EQUITY>                                                                   0
<PAID-IN-CAPITAL-COMMON>                                                 13,481,702
<SHARES-COMMON-STOCK>                                                     1,111,688
<SHARES-COMMON-PRIOR>                                                             0
<ACCUMULATED-NII-CURRENT>                                                         0
<OVERDISTRIBUTION-NII>                                                            0
<ACCUMULATED-NET-GAINS>                                                   (167,533)
<OVERDISTRIBUTION-GAINS>                                                          0
<ACCUM-APPREC-OR-DEPREC>                                                  (182,945)
<NET-ASSETS>                                                             13,131,224
<DIVIDEND-INCOME>                                                                 0
<INTEREST-INCOME>                                                           917,718
<OTHER-INCOME>                                                                    0
<EXPENSES-NET>                                                             (85,165)
<NET-INVESTMENT-INCOME>                                                     832,553
<REALIZED-GAINS-CURRENT>                                                  (167,533)
<APPREC-INCREASE-CURRENT>                                                 (182,945)
<NET-CHANGE-FROM-OPS>                                                       482,075
<EQUALIZATION>                                                                    0
<DISTRIBUTIONS-OF-INCOME>                                                 (488,648)
<DISTRIBUTIONS-OF-GAINS>                                                          0
<DISTRIBUTIONS-OTHER>                                                             0
<NUMBER-OF-SHARES-SOLD>                                                  22,722,171
<NUMBER-OF-SHARES-REDEEMED>                                             (9,456,991)
<SHARES-REINVESTED>                                                          96,652
<NET-CHANGE-IN-ASSETS>                                                   13,355,259
<ACCUMULATED-NII-PRIOR>                                                           0
<ACCUMULATED-GAINS-PRIOR>                                                         0
<OVERDISTRIB-NII-PRIOR>                                                           0
<OVERDIST-NET-GAINS-PRIOR>                                                        0
<GROSS-ADVISORY-FEES>                                                        79,235
<INTEREST-EXPENSE>                                                                0
<GROSS-EXPENSE>                                                             126,945
<AVERAGE-NET-ASSETS>                                                     15,640,150
<PER-SHARE-NAV-BEGIN>                                                         12.00
<PER-SHARE-NII>                                                                 .37
<PER-SHARE-GAIN-APPREC>                                                       (.19)
<PER-SHARE-DIVIDEND>                                                          (.37)
<PER-SHARE-DISTRIBUTIONS>                                                         0
<RETURNS-OF-CAPITAL>                                                              0
<PER-SHARE-NAV-END>                                                           11.81
<EXPENSE-RATIO>                                                                 .94
<AVG-DEBT-OUTSTANDING>                                                            0
<AVG-DEBT-PER-SHARE>                                                              0
        






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