PIPER INSTITUTIONAL FUNDS INC
497, 1996-06-24
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<PAGE>
                PROSPECTUS DATED NOVEMBER 1, 1995, AS SUPPLEMENTED JUNE 24, 1996
 
                         PIPER INSTITUTIONAL FUNDS INC.
                              PIPER JAFFRAY TOWER
           222 SOUTH NINTH STREET, MINNEAPOLIS, MINNESOTA 55402-3804
            (612) 342-6387 (LOCAL CALLS), (800) 866-7778 (TOLL FREE)
                             ---------------------
 
    Piper  Institutional Funds Inc.  (the "Company") is  an open-end mutual fund
whose shares are  currently offered  in two series:  Institutional Money  Market
Fund  and Institutional Government Adjustable Portfolio (the "Funds"). Each Fund
has its  own  investment  objective  and policies  designed  to  meet  different
investment goals.
 
    INSTITUTIONAL  MONEY  MARKET FUND  has  an investment  objective  of maximum
current income  consistent  with  preservation of  capital  and  maintenance  of
liquidity. Institutional Money Market Fund will invest only in securities issued
or  guaranteed by the  U.S. Government or its  agencies or instrumentalities and
repurchase agreements and  reverse repurchase  agreements with  respect to  such
securities.
 
    INSTITUTIONAL GOVERNMENT ADJUSTABLE PORTFOLIO has an investment objective of
high current income consistent with low principal volatility. The Fund will seek
to  achieve that  objective by  investing primarily (at  least 65%  of its total
assets under normal  market conditions) in  adjustable rate mortgage  securities
issued   or   guaranteed   by   the  U.S.   Government   or   its   agencies  or
instrumentalities. The Fund's investments in mortgage-related securities include
derivative mortgage securities.
 
    ON JUNE 18, 1996, THE BOARD  OF DIRECTORS OF PIPER INSTITUTIONAL FUNDS  INC.
(THE  "COMPANY")  UNANIMOUSLY APPROVED  THE  MERGER OF  INSTITUTIONAL GOVERNMENT
ADJUSTABLE PORTFOLIO  INTO  ADJUSTABLE  RATE  MORTGAGE  SECURITIES  FUND  ("ARMS
FUND"),  A SERIES  OF PIPER  FUNDS INC.  -- II.  SEE "INVESTMENT  OBJECTIVES AND
POLICIES -- INSTITUTIONAL GOVERNMENT ADJUSTABLE PORTFOLIO."
 
    INVESTMENTS IN THE  FUNDS ARE  NEITHER INSURED  NOR GUARANTEED  BY THE  U.S.
GOVERNMENT.  THERE IS NO ASSURANCE THAT  INSTITUTIONAL MONEY MARKET FUND WILL BE
ABLE TO MAINTAIN  A STABLE  NET ASSET VALUE  OF $1.00  PER SHARE.  INSTITUTIONAL
GOVERNMENT  ADJUSTABLE  PORTFOLIO  MAY INVEST  IN  "RESTRICTED  SECURITIES." SEE
"SPECIAL INVESTMENT METHODS -- ILLIQUID SECURITIES".
 
    This Prospectus concisely describes the information about the Funds that you
should know  before  investing.  Please read  the  Prospectus  carefully  before
investing and retain it for future reference.
 
    A Statement of Additional Information about the Funds dated November 1, 1995
is  available free  of charge. Write  to the  Funds at Piper  Jaffray Tower, 222
South  Ninth  Street,  Minneapolis,  Minnesota  55402-3804  or  telephone  (612)
342-6387  (local  calls)  or  (800)  866-7778  (toll  free).  The  Statement  of
Additional  Information  has  been  filed  with  the  Securities  and   Exchange
Commission and is incorporated in its entirety by reference in 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>
                                  INTRODUCTION
 
    Institutional  Money  Market Fund  ("Money  Market Fund")  and Institutional
Government Adjustable Portfolio ("Adjustable Portfolio") (sometimes individually
referred to herein as a "Fund" or,  collectively, as the "Funds") are series  of
Piper   Institutional  Funds  Inc.  (the   "Company"),  an  open-end  management
investment company organized under the laws  of the State of Minnesota in  1992.
Each  Fund has a different investment objective,  as described on the cover page
of this Prospectus,  and is  designed to  meet different  investment needs.  The
Funds are classified as diversified mutual funds.
 
THE INVESTMENT ADVISER
 
    The  Funds  are  managed  by  Piper  Capital  Management  Incorporated  (the
"Adviser"), a wholly owned subsidiary of Piper Jaffray Companies Inc. Each  Fund
pays the Adviser a fee for managing its investment portfolio. The fees for Money
Market  Fund and Adjustable Portfolio are paid at annual rates of .15% and .30%,
respectively, of  each  Fund's average  daily  net assets.  See  "Management  --
Investment Adviser."
 
THE DISTRIBUTOR
 
    Piper  Jaffray Inc. ("Piper  Jaffray" or the  "Distributor"), a wholly owned
subsidiary of Piper  Jaffray Companies  Inc. and  an affiliate  of the  Adviser,
serves as Distributor of the Funds' shares.
 
OFFERING PRICES
 
    Shares  of Money Market  Fund are offered  to the public  at their net asset
value of  $1.00 per  share with  no sales  charge. There  can be  no  assurance,
however,  that  the net  asset  value per  share of  Money  Market Fund  will be
maintained at $1.00.
 
    Shares of  Adjustable  Portfolio are  offered  to  the public  at  the  next
determined  net asset value after  receipt of an order  by a shareholder's Piper
Jaffray Investment Executive or other broker-dealer, plus a maximum sales charge
of 1.00% of the offering price (1.01%  of the net amount invested) on  purchases
of less than $250,000. The sales charge is reduced to .50% of the offering price
on  purchases of $250,000 or more, with no sales charge incurred on purchases of
$500,000 or more.
 
MINIMUM INITIAL AND SUBSEQUENT INVESTMENTS
 
    The minimum  initial investment  for  each Fund  is  $100,000. There  is  no
minimum   for  subsequent  investments.  The   minimum  initial  investment  for
Adjustable Portfolio  may  be waived  by  the Distributor  for  401(k)  employee
benefit  plans administered by Piper Trust  Company. See "How to Purchase Shares
- -- Minimum Investments."
 
EXCHANGES
 
    You may exchange your shares for shares of any other mutual fund managed  by
the  Adviser which is open to new investors  and eligible for sale in your state
of residence. All exchanges are  subject to the minimum investment  requirements
and  other applicable terms set forth in the prospectus of the fund whose shares
you acquire. Exchanges  are made on  the basis of  the net asset  values of  the
funds  involved, except that investors exchanging into a fund which has a higher
sales charge  must pay  the difference.  You may  make four  exchanges per  year
without  payment of a service  charge. Thereafter, there is  a $5 service charge
for each exchange. See "Shareholder Services -- Exchange Privilege."
 
REDEMPTION PRICE
 
    Shares of the Funds  may be redeemed  at any time at  their net asset  value
next  determined after  a redemption request  is received by  your Piper Jaffray
Investment Executive or other broker-dealer.
 
                                       2
<PAGE>
The Funds reserve the right, upon 30 days' written notice, to redeem an  account
if  the net asset value  of the shares in that  account falls below $50,000. See
"How to Redeem Shares -- Involuntary Redemption."
 
CERTAIN RISK FACTORS TO CONSIDER
 
    An investment in either  of the Funds  is subject to  certain risks, as  set
forth  in  detail  under  "Investment  Objectives  and  Policies"  and  "Special
Investment Methods." As with other mutual funds, there can be no assurance  that
either  Fund will achieve its objective. There is no assurance Money Market Fund
will be able to maintain a stable net asset value of $1.00 per share. Adjustable
Portfolio is subject to interest rate risk (the risk that rising interest  rates
will  make bonds issued  at lower interest  rates worth less).  As a result, the
value of Adjustable Portfolio's shares  will vary. Adjustable Portfolio is  also
subject  to credit risk  (the risk that a  bond issuer will  fail to make timely
payments of  interest  or  principal)  to the  extent  it  invests  in  non-U.S.
Government   securities.  Adjustable  Portfolio  may  engage  in  the  following
investment practices: the use of repurchase agreements, the lending of portfolio
securities, borrowing  from  banks, the  use  of reverse  repurchase  agreements
(reverse  repurchase  agreements  involve  the  speculative  technique  known as
leverage), the use of hedging techniques, including interest rate  transactions,
options, futures contracts and options on futures contracts, and the purchase or
sale  of securities on a "when-issued"  or "forward commitment" basis, including
the use of mortgage dollar rolls.  These techniques may increase the  volatility
of  the Fund's net asset  value. Adjustable Portfolio purchases mortgage-related
securities which, in addition to interest  rate risk, are subject to  prepayment
risk.  Adjustable Portfolio's investments in mortgage-related securities include
securities commonly referred to as derivative mortgage securities. Recent market
experience  has  shown  that  certain  derivative  mortgage  securities  may  be
extremely  sensitive to changes in interest rates and in prepayment rates on the
underlying mortgage assets and, as a  result, the prices of such securities  may
be  highly volatile. Adjustable Portfolio may also invest up to 10% of its total
assets in  securities denominated  in Canadian  dollars. Money  Market Fund  may
engage  in the use of  repurchase agreements and, with respect  to 5% of its net
assets, reverse repurchase agreements fully collateralized by securities  issued
or  guaranteed by the U.S. Government  or its agencies or instrumentalities. All
of these  transactions  involve  certain  special  risks,  as  set  forth  under
"Investment Objectives and Policies" and "Special Investment Methods."
 
SHAREHOLDER INQUIRIES
 
    Any  questions or communications  regarding a shareholder  account should be
directed to your Piper  Jaffray investment executive or,  in the case of  shares
held through another broker-dealer, to IFTC at (800) 874-6205. General inquiries
regarding  the Funds should be directed to the Funds at the telephone number set
forth on the cover of this Prospectus.
 
                                       3
<PAGE>
                                 FUND EXPENSES
 
<TABLE>
<CAPTION>
                                                     MONEY MARKET   ADJUSTABLE
                                                         FUND       PORTFOLIO
                                                     ------------   ----------
 <S>                                                 <C>            <C>
 SHAREHOLDER TRANSACTION EXPENSES
   Maximum Sales Load Imposed on Purchases (as a
    percentage of offering price)..................      None        1.00%(1)
   Exchange Fee (2)................................    $0           $0
 ANNUAL FUND OPERATING EXPENSES (as a percentage of
  average net assets)
   Management Fees.................................      .15%         .30%
   Rule 12b-1 Fees.................................      None          None
   Other Expenses (after voluntary expense
    reimbursements)................................      .20%         .30%
                                                       --
                                                                    ---
   Total Fund Operating Expenses (after voluntary
    expense reimbursements)........................      .35%         .60%
<FN>
- ------------------------
(1)  The sales charge is reduced to .50%  of the offering price on purchases  of
     $250,000  or more. In connection with  purchases of $500,000 or more, there
     is no initial sales charge. See "How to Purchase Shares -- Public  Offering
     Price."
(2)  There  is a  $5.00 fee for  each exchange  in excess of  four exchanges per
     year. See "How to Purchase Shares -- Exchange Privilege."
</TABLE>
 
EXAMPLE
 
    You would pay the  following expenses on a  $1,000 investment assuming a  5%
annual return and redemption at the end of each time period:
 
<TABLE>
<CAPTION>
                                                     MONEY MARKET   ADJUSTABLE
                                                         FUND       PORTFOLIO
                                                     ------------   ----------
 <S>                                                 <C>            <C>
    1 Year.........................................       $ 4           $16
    3 Years........................................       $11           $29
    5 Years........................................       $20           $43
   10 Years........................................       $44           $84
</TABLE>
 
    The  purpose  of  the  above  Fund  Expenses  table  is  to  assist  you  in
understanding the various costs  and expenses that investors  in the Funds  will
bear  directly or indirectly. THE  EXAMPLE CONTAINED IN THE  TABLE SHOULD NOT BE
CONSIDERED A REPRESENTATION OF PAST OR  FUTURE EXPENSES. ACTUAL EXPENSES MAY  BE
GREATER OR LESS THAN THOSE SHOWN.
 
    Under  an Investment Advisory and Management Agreement between the Funds and
the Adviser, the Adviser is entitled to receive fees from Money Market Fund  and
Adjustable Portfolio equal on an annual basis to .15% and .30%, respectively, of
each  Fund's average daily  net assets. The Adviser  has voluntarily agreed, for
the fiscal  year  ending June  30,  1996, to  reimburse  Money Market  Fund  and
Adjustable Portfolio to the extent that total operating expenses exceed .35% and
 .60%  per  annum, respectively,  of  average daily  net  assets. The  Total Fund
Operating Expenses set  forth in the  above table are  based on this  agreement.
Voluntary  reimbursements  by  the  Adviser  may  be  discontinued  at  any time
following the  Funds' fiscal  year end,  at the  Adviser's discretion.  For  the
fiscal  year ended  June 30,  1995, the  Adviser voluntarily  agreed to  pay all
operating expenses of Money Market Fund and Adjustable Portfolio which  exceeded
 .35%  and .55%, respectively, of average daily net assets. Absent such voluntary
expense reimbursements, Total Fund Operating  Expenses would have been .49%  and
 .75%  of  average daily  net assets,  respectively. For  additional information,
including a more  complete explanation  of management fees,  see "Management  --
Investment Adviser" and "Management -- Expenses."
 
                                       4
<PAGE>
                              FINANCIAL HIGHLIGHTS
 
    The  following financial highlights  have been audited  by KPMG Peat Marwick
LLP, independent auditors, and should be read in conjunction with the  financial
statements  and the related notes thereto  appearing in the Fund's annual report
to shareholders. An annual report of the Funds can be obtained without charge by
contacting the Funds  at (612) 342-6387  (local calls) or  (800) 866-7778  (toll
free).  In addition to financial statements,  the annual report contains further
information about the performance of the Funds.
 
MONEY MARKET FUND
 
<TABLE>
<CAPTION>
                                             FISCAL YEAR
                                            ENDED JUNE 30
                                           ---------------      PERIOD FROM
                                            1995     1994    2/2/93* TO 6/30/93
                                           ------   ------   ------------------
 <S>                                       <C>      <C>      <C>
 Net asset value, beginning of period....  $1.00    $1.00         $1.00
 Operations:
   Net investment income.................   0.05     0.03          0.01
                                           ------   ------        -----
     Total from operations...............   0.05     0.03          0.01
                                           ------   ------        -----
 Distributions from net investment
  income.................................  (0.05)   (0.03)        (0.01)
                                           ------   ------        -----
 Net asset value, end of period..........  $1.00    $1.00         $1.00
                                           ------   ------        -----
                                           ------   ------        -----
 Total return+...........................   5.26%    3.23%         1.24%
 Net assets, end of period (in
  millions)..............................  $  52    $  35         $  40
 Ratio of expenses to average daily net
  assets++...............................   0.35%    0.35%         0.35%**
 Ratio of net investment income to
  average daily net assets++.............   5.17%    3.26%         3.02%**
<FN>
- ------------------------
 *   Commencement of operations.
**   Adjusted to an annual basis.
 +   Total return is based on the change  in net asset value during the  period,
     assumes  reinvestment of all distributions at  net asset value and does not
     reflect a sales charge.
++   Various fees  and  expenses were  voluntarily  waived or  absorbed  by  the
     Adviser  during the years ended  June 30, 1995 and  1994. Had the Fund paid
     all expenses, the ratios of expenses  and net investment income to  average
     daily net assets would have been 0.49%/5.03% in fiscal 1995 and 0.61%/3.00%
     in fiscal 1994.
</TABLE>
 
                                       5
<PAGE>
ADJUSTABLE PORTFOLIO
 
<TABLE>
<CAPTION>
                                           FISCAL YEAR ENDED
                                                JUNE 30
                                           -----------------      PERIOD FROM
                                            1995      1994     2/2/93* TO 6/30/93
                                           -------   -------   ------------------
 <S>                                       <C>       <C>       <C>
 Net asset value, beginning of period....  $ 9.46    $10.04         $10.00
 Operations:
   Net investment income.................    0.52      0.49           0.18
   Net realized and unrealized gains
    (losses) on investments..............   (0.04)    (0.57)          0.04
                                           -------   -------       -------
     Total from operations...............    0.48     (0.08)          0.22
                                           -------   -------       -------
 Distributions to shareholders:
   From net investment income............   (0.41)    (0.50)         (0.18)
   Tax return of capital.................   (0.09)     --          --
                                           -------   -------       -------
     Total distributions.................   (0.50)    (0.50)         (0.18)
                                           -------   -------       -------
 Net asset value, end of period..........  $ 9.44    $ 9.46         $10.04
                                           -------   -------       -------
                                           -------   -------       -------
 Total return+...........................    5.26%    (0.91%)         2.18%
 Net assets, end of period (in
  millions)..............................  $   15    $   35         $   41
 Ratio of expenses to average daily net
  assets++...............................    0.55%     0.55%          0.74%**
 Ratio of net investment income to
  average daily net assets++.............    5.54%     5.13%          4.73%**
 Portfolio turnover rate (excluding
  short-term securities).................      43%      110%            26%
<FN>
- ------------------------
 *   Commencement of operations.
**   Adjusted to an annual basis.
 +   Total  return is based on the change  in net asset value during the period,
     assumes reinvestment of all distributions at  net asset value and does  not
     reflect a sales charge.
++   Various  fees  and  expenses were  voluntarily  waived or  absorbed  by the
     Adviser during the years ended  June 30, 1995 and  1994. Had the Fund  paid
     all  expenses, the ratios of expenses  and net investment income to average
     daily net assets would have been 0.75%/5.34% in fiscal 1995 and 0.60%/5.08%
     in fiscal 1994.
</TABLE>
 
                                       6
<PAGE>
                       INVESTMENT OBJECTIVES AND POLICIES
 
    The investment objectives listed below cannot be changed without shareholder
approval. In view of the risks inherent in all investments in securities,  there
is  no assurance that these objectives will be achieved. The investment policies
and techniques  employed in  pursuit of  the Funds'  objectives may  be  changed
without shareholder approval, unless otherwise noted.
 
INSTITUTIONAL MONEY MARKET FUND
 
    RULE 2A-7.  Money Market Fund will be subject to the investment restrictions
of  Rule 2a-7 under the Investment Company Act  of 1940 in addition to its other
policies and  restrictions discussed  below. Rule  2a-7 requires  that the  Fund
invest  exclusively in securities that mature within  397 days and that the Fund
maintain an average weighted maturity of not  more than 90 days. Rule 2a-7  also
requires  that  all  investments  by  the  Fund  be  limited  to  United  States
dollar-denominated investments that: (1) present "minimal credit risks," and (2)
are at  the  time  of acquisition  "Eligible  Securities."  Eligible  Securities
include,  among others, securities  that are rated  by two Nationally Recognized
Statistical Rating Organizations ("NRSROs") in one of the two highest categories
for short-term  debt  obligations, such  as  A-1 or  A-2  by Standard  &  Poor's
Corporation  ("Standard & Poor's")  or P-1 or P-2  by Moody's Investors Service,
Inc. ("Moody's"). It is the responsibility of the Adviser to determine that  the
Fund's  investments  present  only  "minimal  credit  risks"  and  are  Eligible
Securities. The Funds' Board of Directors has established written guidelines and
procedures for the Adviser and  oversees the Adviser's determination that  Money
Market  Fund's portfolio securities present only  "minimal credit risks" and are
Eligible Securities.
 
    Under Rule 2a-7, 95%  of the assets of  non-tax-exempt money funds (such  as
Money Market Fund) must be invested in Eligible Securities that are deemed First
Tier  Securities, which include, among others, securities rated by two NRSROs in
the highest category (such as A-1 and  P-1). Rule 2a-7 requires that (1) a  fund
may  not invest  more than  5% of  its total  assets in  securities of  a single
issuer, other than U.S.  Government securities, (2) a  fund may not invest  more
than 5% of its total assets in Second Tier Securities (I.E., Eligible Securities
that  are not First Tier Securities) and  (3) a fund's investment in Second Tier
Securities of a single  issuer may not  exceed the greater of  1% of the  fund's
total assets or $1,000,000.
 
    INVESTMENT  OBJECTIVE.  Money Market  Fund  has an  investment  objective of
maximum current income consistent with  preservation of capital and  maintenance
of liquidity.
 
    INVESTMENT  POLICIES AND TECHNIQUES.  Money Market Fund  will invest only in
U.S. Government Securities (as defined  below) and in repurchase agreements  and
reverse  repurchase  agreements with  respect to  such securities.  See "Special
Investment  Methods  --  Repurchase  Agreements"  and  "--  Reverse   Repurchase
Agreements."  The  Fund will  purchase only  those  securities with  a remaining
effective maturity of 397 calendar days or less on the date of purchase and will
maintain a dollar-weighted average maturity of its portfolio of 90 days or less.
 
    U.S. Government  Securities  are  obligations issued  or  guaranteed  as  to
payment  of principal  and interest  by the U.S.  Government or  its agencies or
instrumentalities. These  securities  include  direct obligations  of  the  U.S.
Treasury,  such as U.S. Treasury bills, notes and bonds, and obligations of U.S.
Government agencies or instrumentalities, including, but not limited to, Federal
Home Loan Banks, the Farmers Home Administration, Federal Farm Credit Banks, the
Federal  National  Mortgage  Association,   the  Government  National   Mortgage
Association, the Federal Home Loan Mortgage
 
                                       7
<PAGE>
Corporation,   the  Financing   Corporation  and  the   Student  Loan  Marketing
Association. Obligations of  U.S. Government agencies  or instrumentalities  are
backed  in  a  variety  of  ways  by the  U.S.  Government  or  its  agencies or
instrumentalities. Some  of  these  obligations,  such  as  Government  National
Mortgage  Association mortgage-backed securities,  are backed by  the full faith
and credit of the U.S. Treasury. Others, such as those of the Federal Home  Loan
Banks,  are backed by the right of the issuer to borrow from the Treasury. Still
others, such as those issued by  the Federal National Mortgage Association,  are
backed by the discretionary authority of the U.S. Government to purchase certain
obligations of the agency or instrumentality. Other obligations may be backed by
an  irrevocable letter  of credit  of an agency  or instrumentality  of the U.S.
Government. Finally, obligations of other agencies or instrumentalities are only
backed by the credit of the agency or instrumentality issuing the obligations.
 
INSTITUTIONAL GOVERNMENT ADJUSTABLE PORTFOLIO
 
    ON JUNE 18, 1996, THE BOARD OF DIRECTORS OF THE COMPANY UNANIMOUSLY APPROVED
THE MERGER OF ADJUSTABLE PORTFOLIO INTO ADJUSTABLE RATE MORTGAGE SECURITIES FUND
("ARMS FUND"), A  SERIES OF  PIPER FUNDS INC.  -- II.  PIPER CAPITAL  MANAGEMENT
INCORPORATED,  ADJUSTABLE PORTFOLIO'S INVESTMENT ADVISER, RECOMMENDED THE MERGER
TO THE BOARD BECAUSE ADJUSTABLE PORTFOLIO HAS BEEN UNABLE TO ATTRACT AND  RETAIN
SUFFICIENT  ASSETS FOR ITS CONTINUED OPERATION  TO BE ECONOMICALLY FEASIBLE. THE
MERGER IS  SUBJECT  TO  SHAREHOLDER  APPROVAL. IF  THE  MERGER  IS  APPROVED  BY
SHAREHOLDERS,  ARMS  FUND  WILL  ACQUIRE  SUBSTANTIALLY  ALL  OF  THE  ASSETS OF
ADJUSTABLE PORFOLIO IN EXCHANGE FOR ARMS FUND  SHARES WITH A VALUE EQUAL TO  THE
VALUE  OF THEIR  ADJUSTABLE PORTFOLIO  SHARES. THE  COMPANY WILL  CALL A SPECIAL
MEETING OF ADJUSTABLE PORTFOLIO SHAREHOLDERS AT  A DATE TO BE ANNOUNCED FOR  THE
PURPOSE  OF VOTING ON THE PROPOSED MERGER. ADDITIONAL INFORMATION CONCERNING THE
PROPOSED MERGER WILL BE INCLUDED IN THE PROXY MATERIALS FOR SUCH MEETING.
 
    INVESTMENT OBJECTIVE.  Adjustable Portfolio  has an investment objective  of
high current income consistent with low principal volatility. Despite the Fund's
investment  objective of low principal  volatility, investors should expect some
fluctuation in  the net  asset value  of their  shares. See  "Investment  Risks"
below.
 
    INVESTMENT  POLICIES  AND TECHNIQUES.    Adjustable Portfolio,  under normal
conditions, will seek to achieve its investment objective by investing primarily
(at least 65% of its total assets) in a portfolio of Mortgage-Backed  Securities
(as  defined herein)  having adjustable interest  rates which  reset at periodic
intervals ("adjustable rate mortgage securities"  or "ARMS") and which are  U.S.
Government  Securities,  as  defined  above  under  "Investment  Objectives  and
Policies -- Institutional  Money Market  Fund." ARMS  include both  pass-through
securities representing interests in adjustable rate mortgage loans and floating
rate  collateralized mortgage obligations. The balance  of the Fund's assets (up
to 35% of total assets) may be invested in ARMS issued by private organizations,
Mortgage-Backed Securities  other  than ARMS,  other  types of  U.S.  Government
Securities, Canadian Government Securities, Foreign Index Linked Instruments and
Corporate   Debt  Securities.   Investments  in  each   of  Canadian  Government
Securities, Foreign Index Linked Instruments  and Corporate Debt Securities  are
limited to 10% of total assets. Securities in which Adjustable Portfolio invests
(other  than  U.S. Government  Securities)  must be  rated,  as of  the  date of
purchase, AAA or better by Standard & Poor's or, if unrated, be of a  comparable
quality  as determined  by the  Adviser. In  the event  that a  security held by
Adjustable Portfolio is downgraded to a rating  below AAA or, if unrated, is  no
longer  of a quality  comparable to a  security rated AAA,  as determined by the
Adviser, the Fund  will sell  such a  security as  promptly as  possible. For  a
discussion  of Standard  & Poor's  ratings, see Appendix  A to  the Statement of
Additional Information.
 
                                       8
<PAGE>
    The Fund  may engage  in options  and financial  futures transactions  which
relate  to the securities  in which it  invests, may engage  in foreign currency
exchange transactions with  respect to  its investments  in Canadian  Government
Securities,  may enter into  interest rate swaps and  purchase and sell interest
rate caps  and floors,  may purchase  or  sell securities  on a  when-issued  or
forward  commitment basis, including  the use of mortgage  dollar rolls, and may
lend its portfolio  securities. The  Fund's investments in  options and  futures
contracts  will not be included in the 65% of total assets that must be invested
in ARMS  which are  U.S. Government  Securities,  even if  they relate  to  such
securities.  For  temporary  defensive  purposes, the  Fund  may  invest without
limitation in cash or in high-quality debt securities with remaining  maturities
of one year or less. Such securities may include (a) commercial paper rated A-1+
by  Standard & Poor's,  (b) certificates of deposit,  time deposits and bankers'
acceptances with any bank the unsecured commercial paper of which is rated  A-1+
by  Standard & Poor's (or, in  the case of the principal  bank in a bank holding
company, the unsecured commercial  paper of the bank  holding company), and  (c)
U.S. Government Securities.
 
    INVESTMENT  RISKS.  Adjustable  Portfolio is subject  to certain risks which
could result in fluctuation  of the net  asset value of  the Fund's shares.  The
Fund  is subject to interest rate risk, which  is the potential for a decline in
bond prices due to rising interest rates. In general, bond prices vary inversely
with interest  rates. When  interest  rates rise,  bond prices  generally  fall.
Conversely,  when interest rates fall, bond  prices generally rise. Although the
ARMS in the Fund's portfolio should generally be more resistant to price  swings
than  other debt securities because the interest  rates of ARMS move with market
interest rates, the  adjustable rate feature  of ARMS will  not eliminate  price
fluctuations.  See "Adjustable Rate  Mortgage Securities --  Interest Rate Risk"
below. The Fund's investments in  ARMS and other Mortgage-Backed Securities  are
also  subject to  prepayment risk. See  "Adjustable Rate  Mortgage Securities --
Prepayment Risk" below. In addition, the Fund  is subject to credit risk to  the
extent  it invests in non-U.S. Government securities. Credit risk, also known as
default risk, is the  possibility that a  bond issuer will  fail to make  timely
payments  of  interest  or  principal.  These  and  other  risks  of  Adjustable
Portfolio's investments are described in detail below.
 
    Adjustable Portfolio's  investments in  mortgage-related securities  include
derivative  mortgage securities such as  collateralized mortgage obligations and
stripped mortgage-backed securities which may involve risks in addition to those
found in other mortgage-related securities.  Recent market experience has  shown
that  certain derivative mortgage securities may  be highly sensitive to changes
in interest and prepayment rates and, as a result, the prices of such securities
may be highly  volatile. In addition,  recent market experience  has shown  that
during  periods  of rising  interest rates,  the  market for  certain derivative
mortgage securities may become more unstable and such securities may become more
difficult to sell as market makers  choose not to repurchase such securities  or
offer  prices, based  on current  market conditions,  which are  unacceptable to
Adjustable Portfolio.
 
    Adjustable Portfolio also may engage  in investment practices which  involve
certain  special risks. See "Special Investment Methods" below. The use of these
investment practices may increase the  volatility of Adjustable Portfolio's  net
asset value.
 
    ADJUSTABLE RATE MORTGAGE SECURITIES
 
    U.S.  GOVERNMENT MORTGAGE PASS-THROUGH SECURITIES.  Adjustable Portfolio may
invest in ARMS which are "pass-through"  securities issued or guaranteed by  the
U.S.  Government or one  of its agencies  or instrumentalities ("U.S. Government
Pass-Throughs"). Pass-through securities  constituting ARMS represent  ownership
interests    in   underlying   pools   of   adjustable   rate   mortgage   loans
 
                                       9
<PAGE>
originated by private  lenders. Such  securities differ  from conventional  debt
securities,  which provide  for periodic  payment of  interest in  fixed amounts
(usually semi-annually) and principal payments at maturity or on specified  call
dates,  in that pass-through securities provide  for monthly payments that are a
pass-through of  the  monthly interest  and  principal payments  (including  any
prepayments)  made by the individual borrowers on the pooled mortgage loans, net
of any fees paid to  the guarantor of such securities  and the servicers of  the
underlying mortgage loans.
 
    The  U.S. Government Pass-Throughs in  which Adjustable Portfolio may invest
are issued  or  guaranteed  by  the  Government  National  Mortgage  Association
("GNMA"),  the Federal  National Mortgage  Association ("FNMA")  and the Federal
Home Loan Mortgage Corporation ("FHLMC"). Each of GNMA, FNMA and FHLMC guarantee
timely distributions  of interest  to  securities holders.  GNMA and  FNMA  also
guarantee timely distribution of scheduled principal. FHLMC generally guarantees
only  ultimate collection of principal on the underlying loans, which collection
may take up to one year. GNMA is a wholly owned corporate instrumentality of the
U.S. Government within the Department of  Housing and Urban Development and  its
guarantee  is backed by the  full faith and credit  of the U.S. Government. FNMA
and FHLMC are federally chartered  corporations and their respective  guarantees
are not backed by the full faith and credit of the U.S. Government.
 
    The  mortgages underlying  ARMS issued by  GNMA are fully  guaranteed by the
Federal Housing Administration  ("FHA") or Veterans  Administration ("VA").  The
mortgages  underlying ARMS issued by FNMA or FHLMC may be backed by conventional
adjustable rate mortgages not guaranteed by FHA or VA.
 
    PRIVATE MORTGAGE  PASS-THROUGH SECURITIES.   Private  Mortgage  Pass-Through
Securities  ("Private Pass-Throughs") are structured similarly to the GNMA, FNMA
and FHLMC mortgage  pass-through securities  described above and  are issued  by
originators  of  and investors  in mortgage  loans,  including savings  and loan
associations, mortgage bankers, commercial  banks, investment banks and  special
purpose  subsidiaries of the foregoing.  Private Pass-Throughs constituting ARMS
are backed  by a  pool of  conventional adjustable  rate mortgage  loans.  Since
Private  Pass-Throughs are not guaranteed by  an entity having the credit status
of GNMA, FNMA  or FHLMC, such  securities generally are  structured with one  or
more  types  of credit  enhancement.  See "Investment  Objectives,  Policies and
Restrictions -- Mortgage-Backed Securities --  Credit Support" in the  Statement
of Additional Information.
 
    CMOS  AND  MULTI-CLASS PASS-THROUGH  SECURITIES.   ARMS in  which Adjustable
Portfolio may invest  also include  adjustable rate  tranches of  collateralized
mortgage   obligations  and  multi-class   pass-through  securities,  which  are
derivative mortgage  securities. Collateralized  mortgage obligations  are  debt
instruments  issued by  special purpose entities  which are secured  by pools of
mortgage loans  or other  Mortgage-Backed Securities.  Multi-class  pass-through
securities  are equity interests in a trust  composed of mortgage loans or other
Mortgage-Backed Securities.  Payments of  principal and  interest on  underlying
collateral  provide the funds to pay debt service on the collateralized mortgage
obligation or  make  scheduled  distributions on  the  multi-class  pass-through
security.  Collateralized  mortgage  obligations  and  multi-class  pass-through
securities (collectively "CMOs" unless the  context indicates otherwise) may  be
issued  by agencies  or instrumentalities of  the U.S. Government  or by private
organizations.
 
                                       10
<PAGE>
    In a CMO, a series of bonds  or certificates is issued in multiple  classes.
Each  class of CMO, often  referred to as a "tranche,"  is issued at a specified
coupon rate and  has a  stated maturity  or final  distribution date.  Principal
prepayments  on  collateral  underlying  a  CMO  may  cause  it  to  be  retired
substantially earlier than the stated maturities or final distribution dates.
 
    The principal  and  interest  on  the mortgages  underlying  a  CMO  may  be
allocated among the CMO's tranches in many ways. See "Mortgage-Backed Securities
- -- CMOs," below. One or more tranches of a CMO may have coupon rates which reset
periodically at a specified increment over an index such as the London Interbank
Offered  Rate ("LIBOR"). These adjustable rate tranches, known as "floating rate
CMOs," will be considered  as ARMS by Adjustable  Portfolio. Floating rate  CMOs
may  be backed by fixed  rate or adjustable rate  mortgages; to date, fixed rate
mortgages have been more commonly utilized for this purpose. Floating rate  CMOs
are  typically issued with lifetime caps on the coupon rate thereon. These caps,
similar to the  caps on adjustable  rate mortgages, represent  a ceiling  beyond
which  the coupon rate on a floating rate CMO may not be increased regardless of
increases in the interest rate index to  which the floating rate CMO is  geared,
which  may cause  the security to  be valued at  a greater discount  than if the
security was not subject to a ceiling.
 
    HOW INTEREST  RATES ARE  SET.   The  interest rates  on  ARMS are  reset  at
periodic  intervals  (generally one  year  or less)  to  an increment  over some
predetermined interest rate  index. There  are two main  categories of  indices:
those  based on  U.S. Treasury  securities and  those derived  from a calculated
measure such as a  cost of funds  index or a moving  average of mortgage  rates.
Commonly  utilized indices include the  one-year and five-year constant maturity
Treasury note rates, the  three-month Treasury bill  rate, the 180-day  Treasury
bill  rate, rates on longer-term Treasury  securities, the 11th District Federal
Home Loan Bank Cost of Funds Index, the National Median Cost of Funds, the  one-
month  or three-month LIBOR,  the prime rate  of a specific  bank, or commercial
paper rates. Some indices, such as the one-year constant maturity Treasury  note
rate, closely mirror changes in market interest rate levels. Others, such as the
11th  District Home Loan Bank Cost of  Funds Index (often related to ARMS issued
by FNMA), tend to lag changes in market rate levels and tend to be somewhat less
volatile. The Adviser will seek to diversify Adjustable Portfolio's  investments
in  ARMS  among a  variety of  indices and  reset periods  to reduce  the Fund's
exposure to the risk of interest rate fluctuations. In selecting a type of  ARMS
for  investment, the Adviser will also consider  the liquidity of the market for
such ARMS.
 
    The underlying adjustable rate mortgages which back ARMS in which Adjustable
Portfolio invests will frequently have caps  and floors which limit the  maximum
amount  by which the loan rate to the residential borrower may change up or down
(1) per reset or  adjustment interval and  (2) over the life  of the loan.  Some
residential  adjustable  rate mortgage  loans  restrict periodic  adjustments by
limiting changes  in  the borrower's  monthly  principal and  interest  payments
rather  than limiting  interest rate changes.  These payment caps  may result in
negative amortization;  i.e., increase  in  the balance  of the  mortgage  loan.
Floating  rate CMOs are  generally backed by fixed  rate mortgages and generally
have lifetime caps on the coupon rate thereon.
 
    INTEREST RATE  RISK.   The  values  of  ARMS, like  other  debt  securities,
generally  vary inversely with  changes in market  interest rates (increasing in
value during periods of declining interest rates and decreasing in value  during
periods  of  increasing  interest rates);  however,  the values  of  ARMS should
generally be more resistant to price  swings than other debt securities  because
the  interest rates of ARMS move with market interest rates. The adjustable rate
feature of ARMS will not, however, eliminate fluctuations in the prices of ARMS,
particularly during periods of extreme fluctuations in
 
                                       11
<PAGE>
interest rates. Also,  since many  adjustable rate  mortgages only  reset on  an
annual  basis, it can be expected that the  prices of ARMS will fluctuate to the
extent that changes in prevailing  interest rates are not immediately  reflected
in the interest rates payable on the underlying adjustable rate mortgages.
 
    PREPAYMENT  RISK.  ARMS, like  other Mortgage-Backed Securities, differ from
conventional bonds in  that principal is  paid back  over the life  of the  ARMS
rather  than at maturity. As a result,  the holder of the ARMS (I.E., Adjustable
Portfolio) receives monthly  scheduled payments of  principal and interest,  and
may  receive  unscheduled  principal payments  representing  prepayments  on the
underlying mortgages. When the holder reinvests the payments and any unscheduled
prepayments of principal it receives, it may receive a rate of interest which is
lower than  the rate  on  the existing  ARMS. For  this  reason, ARMS  are  less
effective  than longer-term debt securities as a means of "locking-in" long-term
interest rates.
 
    ARMS, while having  less risk  of price  decline during  periods of  rapidly
rising  rates than  other investments of  comparable maturities,  will have less
potential  for  capital  appreciation  due   to  the  likelihood  of   increased
prepayments  of mortgages as interest rates  decline. In addition, to the extent
ARMS are purchased at a premium, mortgage foreclosures and unscheduled principal
prepayments will result in  a loss of some  or all of the  premium paid. On  the
other  hand, if ARMS  are purchased at  a discount, both  a scheduled payment of
principal and an unscheduled prepayment  of principal will increase current  and
total  returns  and  will  accelerate  the  recognition  of  income  which, when
distributed to shareholders, will be taxable as ordinary income.
 
    MORTGAGE-BACKED SECURITIES
 
    In addition  to ARMS,  Adjustable Portfolio  may invest  in other  types  of
Mortgage-Backed  Securities.  Mortgage-Backed  Securities  are  securities which
represent interests in or are  collateralized by mortgages. Such securities  are
issued  by GNMA,  FNMA, FHLMC  and by  private organizations  and take  the same
structure as ARMS, i.e., pass-through securities and CMOs. Adjustable  Portfolio
may  invest in any type of Mortgage-Backed Security, including traditional fixed
rate Mortgage-Backed Securities and more recently developed instruments such  as
Stripped  Mortgage-Backed  Securities and  CMOs.  Adjustable Portfolio  may also
invest in  Mortgage-Backed Securities  backed by  fixed rate  mortgages and,  in
conjunction  therewith, pursuant to an interest rate swap, exchange its right to
receive payments at  fixed rates  of interest  for floating  rate payments.  The
intended  net effect of the transaction would be the creation of a security with
the economic  characteristics  of an  adjustable  rate mortgage  security.  Such
"synthetic  ARMS" will not be considered as ARMS for purposes of the requirement
that the Fund invest at least 65% of its total assets in ARMS.
 
    Adjustable Portfolio's investments in Mortgage-Backed Securities other  than
ARMS,  together with  its investments in  ARMS issued  by private organizations,
U.S. Government Securities other than  ARMS and Mortgage-Backed Securities,  and
Canadian Government Securities, are limited to 35% of its total assets.
 
    CMOS.    As  discussed  above, Adjustable  Portfolio's  investments  in ARMS
include   floating   rate   CMOs.   Adjustable   Portfolio's   investments    in
Mortgage-Backed  Securities other than  ARMS may include any  other tranche of a
CMO, provided that Adjustable Portfolio may not invest in the residual interests
of CMOs.
 
                                       12
<PAGE>
    The principal  and  interest  on  the mortgages  underlying  a  CMO  may  be
allocated  among the CMO's  several tranches in many  ways. For example, certain
tranches may have variable or floating interest rates and others may be stripped
securities  which  provide  only  the  principal  or  interest  feature  of  the
underlying   security.   See  "Stripped   Mortgage-Backed   Securities,"  below.
Generally, the  purpose of  the allocation  of the  cash flow  of a  CMO to  the
various  tranches is to  obtain a more  predictable cash flow  to certain of 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 mortgage-related  securities.  As part  of the
process of creating more  predictable cash flows  on most of  the tranches of  a
CMO,  one or  more tranches generally  must be  created that absorb  most of the
volatility in the  cash flows on  the underlying mortgage  loans. The yields  on
these   tranches  are  generally   higher  than  prevailing   market  yields  on
mortgage-related securities with similar maturities. However, as a result of the
uncertainty of the cash flows of these tranches, market prices and yields may be
more volatile  than for  other  CMO tranches.  The  more volatile  CMO  tranches
include inverse floaters, IOs, POs and Z tranches, discussed below.
 
    Adjustable  Portfolio's  investments in  CMO  tranches may  include "inverse
floaters" and "Z tranches." An  inverse floater is a  CMO tranche with a  coupon
rate  that moves inversely to a designated index, such as LIBOR or COFI (Cost of
Funds Index).  Like most  other fixed-income  securities, the  value of  inverse
floaters will decrease as interest rates increase and increase as interest rates
decrease.  Inverse floaters, however, may  exhibit greater price volatility with
changes in interest rates than the majority of mortgage pass-through  securities
or  CMOs. Coupon rates on inverse floaters typically change at a multiple of the
changes in the  relevant index  rate. Thus,  any rise in  the index  rate (as  a
consequence  of an increase in interest  rates) causes a correspondingly greater
drop in the coupon rate of an inverse  floater while any drop in the index  rate
causes  a correspondingly greater increase in  the coupon of an inverse floater.
Some  inverse  floaters   also  exhibit  extreme   sensitivity  to  changes   in
prepayments.
 
    Z  tranches of CMOs defer interest and  principal payments until one or more
other classes of  the CMO have  been paid in  full. Interest accretes  on the  Z
tranche,  being  added to  principal, and  is  compounded through  the accretion
period. After the other classes have been paid in full, interest payments  begin
and  continue through maturity. Z tranches  have characteristics similar to zero
coupon bonds. See "Zero Coupon Treasury  Securities," below. Like a zero  coupon
bond,  during its accretion period a Z  tranche has the advantage of eliminating
the risk of  reinvesting interest  payments at lower  rates during  a period  of
declining market interest rates. At the same time, however, and also like a zero
coupon  bond, the market value of a Z  tranche can be expected to fluctuate more
widely with changes in market  interest rates than would  the market value of  a
tranche  which pays interest currently. In addition, changes in prepayment rates
on the  underlying  mortgage loans  will  affect the  accretion  period of  a  Z
tranche, and therefore also are likely to influence its market value.
 
    STRIPPED  MORTGAGE-BACKED SECURITIES.  Adjustable Portfolio's investments in
Mortgage-Backed Securities other than ARMS may include Stripped  Mortgage-Backed
Securities  ("SMBS"), which are derivative multi-class mortgage securities. SMBS
may be issued  by agencies  or instrumentalities of  the U.S.  Government or  by
private  originators of, or investors in,  mortgage loans, including savings and
loan associations,  mortgage bankers,  commercial  banks, investment  banks  and
special purpose subsidiaries of the foregoing.
 
                                       13
<PAGE>
    There are generally two types of classes of SMBS, one of which (the interest
only  or  "IO"  class) entitles  the  holders thereof  to  receive distributions
consisting solely  or primarily  of all  or a  portion of  the interest  on  the
underling  pool  of  mortgage  loans  or  Mortgage-Backed  Securities ("Mortgage
Assets") and the other of which (the principal only or "PO" class) entitles  the
holders  thereof to receive distributions consisting  solely or primarily of all
or a portion of the principal of the underlying pool of Mortgage Assets. IOs and
POs issued by the U.S. Government  or its agencies and instrumentalities may  be
determined  to  be  liquid  pursuant  to  procedures  adopted  by  the  Board of
Directors. Otherwise, Adjustable Portfolio  will treat IOs  and POs as  illiquid
and  subject to Adjustable Portfolio's restriction of investing no more than 15%
of its net  assets in illiquid  securities. See "Special  Investment Methods  --
Illiquid Securities."
 
    The  cash flows and yields  on IO and PO  classes are extremely sensitive to
the rate of principal payments (including prepayments) on the related underlying
Mortgage Assets. For example,  a rapid or slow  rate of principal payments  will
have  a  material  adverse  effect on  the  yield  to maturity  of  IOs  or POs,
respectively.  If  the  underlying  Mortgage  Assets  experience  greater   than
anticipated  prepayments  of principal,  an investor  in an  IO class  may incur
substantial losses,  even if  the IO  class  is rated  AAA. Conversely,  if  the
underlying  Mortgage Assets  experience slower  than anticipated  prepayments of
principal, the yield on a PO class will be affected more severely than would  be
the case with a traditional Mortgage-Backed Security.
 
    Under  the Internal Revenue  Code, Adjustable Portfolio  will be required to
accrue a portion of the original issue discount on a PO as income each year even
though Adjustable Portfolio receives no cash distribution on the security during
the year.
 
    RISKS OF MORTGAGE-BACKED SECURITIES.  Mortgage-Backed Securities (other than
ARMS) are  subject generally  to the  same risks  as ARMS;  however, such  other
Mortgage-Backed  Securities can be  expected to be affected  to a greater extent
than ARMS by fluctuating  interest rates and prepayments  and to have  different
yield  characteristics, due to  the fact that fixed  rate rather than adjustable
rate mortgages underlie  such securities. Generally,  prepayments on fixed  rate
mortgages  will increase during a period  of falling interest rates and decrease
during a period  of rising  interest rates. Accordingly,  amounts available  for
reinvestment  are likely  to be  greater during  a period  of declining interest
rates than  during a  period  of rising  interest rates  and  the yield  on  the
securities  in which such amounts are reinvested  is likely to be lower than the
yield on the securities that were prepaid or the yield that could be achieved if
such amounts  were reinvested  during  a period  of  rising interest  rates.  If
Adjustable  Portfolio  purchases  Mortgage-Backed  Securities  at  a  premium, a
prepayment rate that is faster than  expected will reduce both the market  value
and  the yield to maturity  from that which was  anticipated, while a prepayment
rate that is slower  than expected will have  the opposite effect of  increasing
yield  to  maturity  and  market  value.  Conversely,  if  Adjustable  Portfolio
purchases  Mortgage-Backed  Securities  at  a  discount,  faster  than  expected
prepayments  will increase, while slower  than expected prepayments will reduce,
yield to maturity and market  value. Mortgage-Backed Securities may decrease  in
value as a result of increases in interest rates and may benefit less than other
fixed  income securities  from declining interest  rates because of  the risk of
prepayment.
 
    Mortgage-Backed Securities  derive  their  value from  underlying  pools  of
mortgages  and, as  such, could  be considered  "derivative" securities. Certain
derivative mortgage  securities, such  as  the more  volatile CMO  tranches  and
Stripped  Mortgage-Backed  Securities,  discussed above,  may  involve  risks in
addition to  those  found in  other  Mortgage-Backed Securities.  Recent  market
experience has shown
 
                                       14
<PAGE>
that  certain derivative mortgage securities may  be highly sensitive to changes
in interest and prepayment rates and, as a result, the prices of such securities
may be highly  volatile. In addition,  recent market experience  has shown  that
during  periods  of rising  interest rates,  the  market for  certain derivative
mortgage securities may become more unstable and such securities may become more
difficult to  sell  as  market  makers either  choose  not  to  repurchase  such
securities  or  offer  prices, based  on  current market  conditions,  which are
unacceptable to Adjustable Portfolio.
 
    ZERO COUPON TREASURY SECURITIES
 
    Adjustable Portfolio may invest in  "zero coupon" Treasury securities  which
are  U.S. Treasury  bills, notes  and bonds  which have  been stripped  of their
unmatured interest coupons and  receipts or certificates representing  interests
in  such stripped debt obligations  and coupons. A zero  coupon security pays no
interest to its holder during its life. Its value to an investor consists of the
difference between its  face value at  the time  of maturity and  the price  for
which  it was acquired, which is generally an amount significantly less than its
face value (sometimes referred to as a "deep discount" price).
 
    Currently U.S. Treasury securities  issued without coupons include  Treasury
bills  and Treasury STRIPS. In  addition, a number of  banks and brokerage firms
separate the principal portions from the coupon portions of U.S. Treasury  bonds
and  notes and  sell them  separately in  the form  of receipts  or certificates
representing undivided  interests in  these instruments  (which instruments  are
generally  held by a bank in a  custodial or trust account). Such securities are
currently not deemed  by the Fund  to be U.S.  Government Securities but  rather
securities issued by the bank or brokerage firm involved.
 
    Zero  coupon Treasury securities  do not entitle the  holder to any periodic
payments of interest  prior to maturity.  Accordingly, those securities  usually
trade  at a deep  discount from their face  or par value and  will be subject to
greater fluctuations of market value in response to changing interest rates than
debt obligations of  comparable maturities which  make current distributions  of
interest.  In certain circumstances,  Adjustable Portfolio could  fail to recoup
its initial investment  in those  securities. Current federal  tax law  requires
that  a holder (such as Adjustable Portfolio) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each  year
even  though Adjustable  Portfolio receives no  interest payment in  cash on the
security during  the year.  In  addition, as  a registered  investment  company,
Adjustable Portfolio will be required to distribute this income to shareholders.
See  "Dividends, Distributions and Tax Status." These distributions will be made
from the Fund's  cash assets or,  if necessary,  from the proceeds  of sales  of
portfolio  securities.  Adjustable  Portfolio  will  not  be  able  to  purchase
additional  income   producing  securities   with  cash   used  to   make   such
distributions,  and the  Fund's current  income ultimately  may be  reduced as a
result.
 
    CANADIAN GOVERNMENT SECURITIES
 
    Adjustable Portfolio may invest  up to 10% of  its total assets in  Canadian
Government Securities. Canadian Government Securities are debt securities issued
or   guaranteed  by   the  Canadian  federal   government,  Canadian  provincial
governments and political subdivisions,  agencies or instrumentalities  thereof.
The  Adviser  anticipates  that  the  Fund's  portfolio  of  Canadian Government
Securities will  consist  primarily  of  Mortgage-Backed  Securities  issued  or
guaranteed  by the Canadian government or  an agency or instrumentality thereof.
Investing in Canadian Government Securities involves considerations and possible
risks not  typically associated  with investing  in U.S.  securities,  including
possible application of Canadian tax laws (including possible future withholding
taxes),  potential difficulties in enforcing contractual obligations, changes in
governmental administrations or economic or monetary
 
                                       15
<PAGE>
policy (in this country or Canada)  or changed circumstances in dealing  between
the  United States and Canada. Canadian brokerage commissions may be higher than
those in the United States and  Canadian securities markets may be less  liquid,
more  volatile and  less subject to  governmental supervision than  those in the
United States.
 
    The value  of Adjustable  Portfolio's  investments denominated  in  Canadian
dollars  could be adversely affected  by a decline in  the value of the Canadian
dollar relative to  the U.S. dollar.  In connection with  such investments,  the
Fund  may from time  to time enter into  foreign exchange transactions, currency
forward and futures  contracts and  foreign currency  options. These  investment
techniques,  and the risks incident thereto, are explained in Appendix A to this
Prospectus.
 
    FOREIGN INDEX LINKED INSTRUMENTS
 
    Adjustable Portfolio may  invest up to  10% of its  total assets in  Foreign
Index  Linked  Instruments. Foreign  Index Linked  Instruments are  fixed income
securities which  are issued  by U.S.  issuers (including  U.S. subsidiaries  of
foreign issuers) and are denominated in U.S. dollars but return principal and/or
pay  interest  to  investors in  amounts  which are  linked  to the  level  of a
particular foreign  index. Foreign  Index Linked  Instruments may  offer  higher
yields than comparable securities linked to purely domestic indices but also may
be  more  volatile.  Foreign  Index  Linked  Instruments  are  relatively recent
innovations for  which  the  market  has  not  yet  been  fully  developed  and,
accordingly, they typically are less liquid than comparable securities linked to
purely  domestic  indices.  In  addition,  the  value  of  Foreign  Index Linked
Instruments will be  affected by fluctuations  in foreign exchange  rates or  in
foreign  interest rates, factors  which do not  typically bear on  the values of
ARMS or most  other securities  in which  the Fund  invests. If  the Adviser  is
incorrect  in its prediction as to the  movements in the direction of particular
foreign currencies or foreign interest rates, the return realized by the Fund on
a Foreign Index Linked Instrument may be lower than if the Fund had invested  in
a  similarly  rated  domestic security.  The  skills needed  to  predict foreign
currency and foreign interest  rates are different from  those needed to  select
domestic portfolio securities. Foreign currency gains and losses with respect to
Foreign  Index Linked  Instruments may  affect the  amount and  timing of income
recognized by the Fund.
 
    CORPORATE DEBT SECURITIES
 
    Adjustable Portfolio may invest up to  10% of its total assets in  Corporate
Debt  Securities.  Corporate  Debt  Securities  are  debt  obligations  of  U.S.
corporations (other  than ARMS  or Mortgage-Backed  Securities). The  values  of
Corporate  Debt  Securities  typically  will fluctuate  in  response  to general
economic conditions, to changes in interest rates and, to a greater extent  than
the  values  of  ARMS  or  Mortgage-Backed  Securities,  to  business conditions
affecting the specific industries  in which the  issuers are engaged.  Corporate
Debt  Securities will typically  decrease in value  of a result  of increases in
interest rates.
 
    Adjustable  Portfolio  may  invest  in  certain  types  of  Corporate   Debt
Securities  that  have  been  issued  with  original  issue  discount  or market
discount. An investment in such securities poses certain economic risks and  may
have certain adverse cash flow consequences to the Fund.
 
    NEW INSTRUMENTS
 
    Investors  should  note  that  new  types  of  ARMS,  other  Mortgage-Backed
Securities,  hedging  instruments  and  other  securities  in  which  Adjustable
Portfolio  may invest  are developed  and marketed from  time to  time and that,
consistent with  its investment  limitations,  Adjustable Portfolio  expects  to
invest  in those securities and instruments that the Adviser believes may assist
the Fund in
 
                                       16
<PAGE>
achieving its investment  objective. Adjustable Portfolio  will provide  written
notice  to shareholders in advance of investments to a significant degree (I.E.,
in excess of 5% of the Fund's net assets) in any type of security other than the
types disclosed in this Prospectus.
 
                           SPECIAL INVESTMENT METHODS
 
REPURCHASE AGREEMENTS
 
    Each Fund  may  enter  into  repurchase  agreements  with  respect  to  U.S.
Government Securities. A repurchase agreement involves the purchase by a Fund of
securities  with the condition that  after a stated period  of time the original
seller (a member bank of the  Federal Reserve System or a recognized  securities
dealer)  will buy  back the  same securities  ("collateral") at  a predetermined
price or yield. Repurchase agreements involve certain risks not associated  with
direct  investments in securities. In the  event the original seller defaults on
its obligation to repurchase,  as a result of  its bankruptcy or otherwise,  the
Fund  will seek  to sell  the collateral,  which action  could involve  costs or
delays. In such case, the Fund's ability to dispose of the collateral to recover
such investment may be restricted or delayed. While collateral will at all times
be maintained in  an amount equal  to the repurchase  price under the  agreement
(including  accrued interest  due thereunder), to  the extent  proceeds from the
sale of collateral were less  than the repurchase price,  a Fund would suffer  a
loss.  In the  event of a  seller's bankruptcy, a  Fund might be  delayed in, or
prevented from,  selling  the  collateral  to  the  Fund's  benefit.  Repurchase
agreements  maturing in more than seven days are considered illiquid and subject
to each Fund's restriction  on investing in  illiquid securities. See  "Illiquid
Securities," below.
 
REVERSE REPURCHASE AGREEMENTS
 
    Each  Fund  may engage  in "reverse  repurchase  agreements" with  banks and
securities  dealers.  Reverse  repurchase  agreements  are  ordinary  repurchase
agreements  in which  the Fund is  the seller  of, rather than  the investor in,
securities and agrees to repurchase them at  an agreed upon time and price.  Use
of  a reverse repurchase agreement may be preferable to a regular sale and later
repurchase of  the  securities  because  it  avoids  certain  market  risks  and
transactions  costs.  Because  certain  of the  incidents  of  ownership  of the
security are retained by the Fund, reverse repurchase agreements are  considered
a  form of borrowing by the Fund from the buyer, collateralized by the security.
At the time  the Fund  enters into a  reverse repurchase  agreement, cash,  U.S.
Government Securities or other liquid high-grade debt obligations having a value
sufficient  to  make  payments for  the  securities  to be  repurchased  will be
segregated, and  will be  maintained throughout  the period  of the  obligation.
Reverse  repurchase  agreements  will  be  used  as  a  means  of  borrowing for
investment purposes. This  speculative technique is  referred to as  leveraging.
Leveraging  may exaggerate  the effect  on net  asset value  of any  increase or
decrease in  the  market value  of  the  Fund's portfolio.  Money  borrowed  for
leveraging  will  be  subject  to interest  costs  which  could  possibly exceed
interest income earned by the Fund on the investment of such borrowed money, and
therefore could adversely affect yield. No more than 25% of the total assets  of
Adjustable  Portfolio and  5% of  the net  assets of  Money Market  Fund will be
subject to reverse repurchase agreements.
 
BORROWING
 
    Each Fund may borrow money from banks for temporary or emergency purposes in
an amount up  to one-third of  the value of  its total assets  in order to  meet
redemption requests without immediately selling any of its portfolio securities.
Reverse  repurchase agreements are not included  in this limitation. If, for any
reason, the current value  of either Fund's total  assets falls below an  amount
equal  to three times the  amount of its indebtedness  from money borrowed, such
Fund will, within three days,
 
                                       17
<PAGE>
reduce its indebtedness to the extent necessary.  To do this, the Fund may  have
to sell a portion of its investments at a time when it may be disadvantageous to
do so. Interest paid by a Fund on borrowed funds would decrease the net earnings
of  that Fund. Neither Fund will purchase portfolio securities while outstanding
borrowings (other than reverse repurchase agreements) exceed 5% of the value  of
the  Fund's  total assets.  Each Fund  may mortgage,  pledge or  hypothecate its
assets to secure permitted  temporary or emergency  borrowing. The policies  set
forth in this paragraph are fundamental and may not be changed with respect to a
Fund without the approval of a majority of that Fund's shares.
 
WHEN-ISSUED SECURITIES
 
    Adjustable  Portfolio may purchase  securities on a  "when-issued" basis and
may purchase  or sell  securities on  a "forward  commitment" basis.  When  such
transactions  are negotiated, the price  is fixed at the  time the commitment is
made, but delivery and payment  for the securities take  place at a later  date.
Adjustable  Portfolio  will not  accrue income  with  respect to  when-issued or
forward commitment  securities  prior to  their  stated delivery  date.  Pending
delivery  of the securities, the Fund maintains  in a segregated account cash or
liquid high-grade debt obligations in an amount sufficient to meet its  purchase
commitments.  The Fund will likewise segregate  securities it sells on a forward
commitment basis.
 
    The purchase  of securities  on a  when-issued or  forward commitment  basis
exposes  Adjustable Portfolio  to risk  because the  securities may  decrease in
value prior to their delivery. Purchasing securities on a when-issued or forward
commitment basis involves the additional risk  that the return available in  the
market  when the delivery takes  place will be higher  than that obtained in the
transaction itself.  The  Fund's purchase  of  securities on  a  when-issued  or
forward  commitment basis while remaining substantially fully invested increases
the amount of the  Fund's assets that  are subject to market  risk to an  amount
that is greater than the Fund's net asset value, which could result in increased
volatility of the price of the Fund's shares.
 
MORTGAGE DOLLAR ROLLS
 
    In  connection with its  ability to purchase securities  on a when-issued or
forward commitment basis, Adjustable Portfolio  may enter into mortgage  "dollar
rolls"  in which the Fund sells securities for delivery in the current month and
simultaneously contracts with the same counterparty to repurchase similar  (same
type,  coupon and maturity)  but not identical securities  on a specified future
date. The Fund gives up the right to receive principal and interest paid on  the
securities sold. However, the Fund would benefit to the extent of any difference
between  the price received for the securities  sold and the lower forward price
for the  future purchase  plus any  fee income  received. Unless  such  benefits
exceed  the  income,  capital appreciation  and  gain  or loss  due  to mortgage
prepayments that would have been realized on the securities sold as part of  the
mortgage  dollar roll,  the use of  this technique will  diminish the investment
performance of the  Fund compared  with what  such performance  would have  been
without  the use  of mortgage dollar  rolls. Adjustable Portfolio  will hold and
maintain in  a segregated  account  until the  settlement  date cash  or  liquid
high-grade debt securities in an amount equal to the forward purchase price. The
benefits  derived from  the use  of mortgage  dollar rolls  may depend  upon the
Adviser's ability to predict correctly mortgage prepayments and interest  rates.
There  is no assurance that mortgage  dollar rolls can be successfully employed.
In addition,  the use  of mortgage  dollar  rolls by  the Fund  while  remaining
substantially  fully invested increases the amount of the Fund's assets that are
subject to market risk to  an amount that is greater  than the Fund's net  asset
value,  which could result  in increased volatility  of the price  of the Fund's
shares.
 
                                       18
<PAGE>
    For financial  reporting  and  tax  purposes,  Adjustable  Portfolio  treats
mortgage  dollar rolls as two separate  transactions: one involving the purchase
of a security and  a separate transaction  involving a sale.  The Fund does  not
currently intend to enter into mortgage dollar rolls that are accounted for as a
financing.
 
    No  more  than  one-third  of Adjustable  Portfolio's  total  assets  may be
committed to the purchase of securities  on a when-issued or forward  commitment
basis, including mortgage dollar roll purchases.
 
LENDING OF PORTFOLIO SECURITIES
 
    In  order  to  generate  income,  Adjustable  Portfolio  may  lend portfolio
securities up to one-third of the  value of its total assets to  broker-dealers,
banks  or other financial  borrowers of securities. As  with other extensions of
credit, there are  risks of  delay in  recovery or even  loss of  rights in  the
collateral  should the borrower of the securities fail financially. However, the
Fund will only enter into loan arrangements with broker-dealers, banks or  other
institutions  which the Adviser has determined are creditworthy under guidelines
established by the Fund's Board of Directors and will receive collateral in  the
form  of cash, U.S.  Government Securities or  other high-grade debt obligations
equal to at least 100% of the value  of the securities loaned. The value of  the
collateral  and of  the securities loaned  will be  marked to market  on a daily
basis. During the time portfolio securities  are on loan, the borrower pays  the
Fund  an amount equivalent to  any interest paid on  the securities and the Fund
may invest the cash  collateral and earn  income or may  receive an agreed  upon
amount  of interest income  from the borrower. However,  the amounts received by
the Fund may  be reduced  by finders'  fees paid  to broker-dealers.  Collateral
(including  any securities purchased with cash collateral) will be maintained by
the Fund's custodian in a segregated account.
 
INTEREST RATE TRANSACTIONS
 
    To preserve a return or spread on a particular investment or portion of  its
portfolio,   to  create  synthetic  adjustable  rate  mortgage  securities  (see
"Investment  Objective  and  Policies  --  Institutional  Government  Adjustable
Portfolio -- Mortgage-Backed Securities") or for other non-speculative purposes,
Adjustable Portfolio may enter into interest rate swaps and may purchase or sell
interest  rate  caps  and  floors.  The  Fund  does  not  intend  to  use  these
transactions for speculative purposes. Interest rate swaps involve the  exchange
by the Fund with another party of their respective commitments to pay or receive
interest,  e.g., an exchange of floating  rate payments for fixed rate payments.
The purchase of an  interest rate cap  entitles the purchaser,  to the extent  a
specified  index exceeds a  predetermined interest rate,  to receive payments of
interest on a contractually-based principal  amount from the party selling  such
interest  rate  cap.  The  purchase  of  an  interest  rate  floor  entitles the
purchaser, to the extent a specified index falls below a predetermined  interest
rate,  to receive payments of interest on a contractually-based principal amount
from the party selling such interest rate floor.
 
    Adjustable Portfolio may enter into interest rate swaps, caps and floors  on
either  an asset-based  or liability-based basis,  depending upon  whether it is
hedging its assets or its liabilities, and will usually enter into interest rate
swaps on a net  basis, i.e., the  two payment streams are  netted out, with  the
Fund  receiving or paying,  as the case may  be, only the net  amount of the two
payments. The net amount of the excess,  if any, of the Fund's obligations  over
its  entitlements with respect to  each interest rate swap  will be accrued on a
daily basis and an amount  of cash or high  quality liquid securities having  an
aggregate  net  asset  value  at  least equal  to  the  accrued  excess  will be
maintained in a segregated account by  the Fund's custodian. If the Fund  enters
into an interest rate swap on other
 
                                       19
<PAGE>
than  a net  basis, the  Fund would  maintain a  segregated account  in the full
amount accrued on a daily  basis of the Fund's  obligations with respect to  the
swap.  To the extent Adjustable Portfolio  sells (I.E., writes) caps and floors,
it will  maintain in  a segregated  account  cash or  high quality  liquid  debt
securities  having  an aggregate  net asset  value  at least  equal to  the full
amount, accrued on a daily basis, of the Fund's obligations with respect to  any
caps  or floors.  The Fund will  not enter into  any interest rate  swap, cap or
floor transaction unless the unsecured senior debt or the claims-paying  ability
of  the other  party thereto  is rated  at least  AA by  Standard &  Poor's. The
Adviser will monitor the creditworthiness of contra-parties on an ongoing basis.
If there is a default  by the other party to  such a transaction, the Fund  will
have contractual remedies pursuant to the agreements related to the transaction.
The  swap market has grown substantially in  recent years with a large number of
banks and  investment banking  firms acting  both as  principals and  as  agents
utilizing standardized swap documentation. The Adviser has determined that, as a
result,  the swap market has become relatively  liquid. Caps and floors are more
recent innovations  for  which  standardized  documentation  has  not  yet  been
developed and, accordingly, they are less liquid than swaps.
 
    There  is no limit on the amount of interest rate swap transactions that may
be entered into by Adjustable Portfolio.  These transactions do not involve  the
delivery of securities or other underlying assets or principal. Accordingly, the
risk of loss with respect to interest rate swaps is limited to the net amount of
interest payments that the Fund is contractually obligated to make. If the other
party to an interest rate swap defaults, the Fund's risk of loss consists of the
net  amount  of interest  payments that  the Fund  contractually is  entitled to
receive. The aggregate purchase price  of caps and floors  held by the Fund  may
not  exceed 5% of the Fund's total assets.  The Fund may sell (I.E., write) caps
and floors without  limitation, subject  to the  segregated account  requirement
described above.
 
OPTIONS TRANSACTIONS
 
    WRITING  COVERED  OPTIONS.    Adjustable Portfolio  may  write  (I.E., sell)
covered put and  call options with  respect to  the securities in  which it  may
invest.  By writing a call option, the Fund becomes obligated during the term of
the option to deliver the securities  underlying the option upon payment of  the
exercise  price if the  option is exercised.  By writing a  put option, the Fund
becomes obligated  during the  term of  the option  to purchase  the  securities
underlying  the option at  the exercise price  if the option  is exercised. With
respect to put options written by  Adjustable Portfolio, there will have been  a
predetermination  that acquisition of  the underlying security  is in accordance
with the investment objective of the Fund.
 
    The principal reason for writing call  or put options is to obtain,  through
the  receipt of premiums, a greater current return than would be realized on the
underlying securities alone. The Fund receives premiums from writing call or put
options, which it retains whether or not the options are exercised. By writing a
call option,  the Fund  might lose  the  potential for  gain on  the  underlying
security  while the option is  open, and by writing a  put option the Fund might
become obligated to purchase the underlying  security for more than its  current
market price upon exercise.
 
    PURCHASING  OPTIONS.  Adjustable Portfolio  may purchase put options, solely
for hedging purposes, in  order to protect portfolio  holdings in an  underlying
security  against a  substantial decline  in the  market value  of such holdings
("protective puts"). Such  protection is  provided during  the life  of the  put
because  the Fund may  sell the underlying  security at the  put exercise price,
regardless of a decline in the  underlying security's market price. Any loss  to
the  Fund is  limited to  the premium  paid for,  and transaction  costs paid in
connection with,  the  put  plus the  initial  excess,  if any,  of  the  market
 
                                       20
<PAGE>
price of the underlying security over the exercise price. However, if the market
price  of such security increases,  the profit the Fund  realizes on the sale of
the security will be  reduced by the  premium paid for the  put option less  any
amount for which the put is sold.
 
    Adjustable  Portfolio may also purchase call  options solely for the purpose
of hedging against an increase in prices of securities that the Fund  ultimately
wants  to buy. Such  protection is provided  during the life  of the call option
because the Fund  may buy  the underlying security  at the  call exercise  price
regardless  of any increase in the  underlying security's market price. In order
for a call option to be profitable, the market price of the underlying  security
must  rise  sufficiently  above the  exercise  price  to cover  the  premium and
transaction costs. By using  call options in  this manner, Adjustable  Portfolio
will  reduce any  profit it  might have  realized had  it bought  the underlying
security at the time it  purchased the call option by  the premium paid for  the
call option and by transaction costs.
 
    Adjustable  Portfolio may  purchase and  write exchange-traded  put and call
options, and  over-the-counter  ("OTC")  put  and  call  options  in  negotiated
transactions  with  the writers  of the  options  since options  on many  of the
portfolio securities held by the  Fund are not traded  on an exchange. The  Fund
will  purchase  OTC options  only from  investment  dealers and  other financial
institutions (such as commercial banks or savings and loan associations)  deemed
creditworthy by the Adviser.
 
    OTC  options are two-party contracts with price and terms negotiated between
buyer and seller. In contrast, exchange-traded options are third-party contracts
with standardized strike prices and expiration  dates, and are purchased from  a
clearing  corporation. Exchange-traded  options have a  continuous liquid market
while OTC options  may not. The  staff of the  SEC has taken  the position  that
purchased  OTC options and  the assets used  to "cover" written  OTC options are
illiquid securities, provided that the entire amount of assets used to cover OTC
options written  by Adjustable  Portfolio will  not be  treated as  illiquid  in
certain  circumstances, as set forth in the Statement of Additional Information.
Adjustable Portfolio will  treat OTC  options, to the  extent set  forth in  the
Statement  of Additional  Information, as  subject to  the Fund's  limitation on
investments in illiquid securities. See "Investment Restrictions," below.
 
    For further information concerning the characteristics and risks of  options
transactions,  see "Investment Objectives, Policies and Restrictions -- Options"
in the Statement of Additional Information.
 
FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS
 
    Adjustable Portfolio may enter into contracts  for the purchase or sale  for
future  delivery  of fixed-income  securities  or contracts  based  on financial
indices including any index of securities in which the Fund may invest ("futures
contracts"). A  "sale"  of  a  futures  contract  means  the  acquisition  of  a
contractual obligation to deliver the securities called for by the contract at a
specified  price on a specified date. The  purchaser of a futures contract on an
index agrees  to take  or  make delivery  of  an amount  of  cash equal  to  the
difference  between a specified dollar multiple of the value of the index on the
expiration date of  the contract  ("current contract  value") and  the price  at
which   the  contract  was  originally  struck.  No  physical  delivery  of  the
fixed-income securities underlying the index  is made. The futures contracts  in
which  the Fund  may invest have  been developed  by and are  traded on national
commodity exchanges.
 
    The purpose of the acquisition or  sale of a futures contract by  Adjustable
Portfolio is to hedge against fluctuations in the value of its portfolio without
actually buying or selling securities. For
 
                                       21
<PAGE>
example,  if  the Fund  owns long-term  debt securities  and interest  rates are
expected to increase, the Fund might  sell futures contracts. If interest  rates
did  increase, the value  of the debt  securities in the  Fund's portfolio would
decline, but  the  value of  the  Fund's  futures contracts  would  increase  at
approximately  the same rate,  thereby keeping the  net asset value  of the Fund
from declining as much as  it otherwise would have. If,  on the other hand,  the
Fund   held  cash  reserves  and   short-term  investments  pending  anticipated
investment in long-term obligations and interest rates were expected to decline,
the Fund might purchase futures contracts for U.S. Government Securities.  Since
the  behavior of such contracts would generally  be similar to that of long-term
securities, the Fund could take advantage  of the anticipated rise in the  value
of  long-term  securities  without actually  buying  them until  the  market had
stabilized. At  that time,  the Fund  could accept  delivery under  the  futures
contracts  or the futures contracts could  be liquidated and the Fund's reserves
could then be used to buy long-term securities in the cash market. The Fund will
engage in such transactions only for hedging purposes, on either an  asset-based
or  a  liability-based basis,  in each  case  in accordance  with the  rules and
regulations of the Commodity Futures Trading  Commission. See Appendix B to  the
Statement of Additional Information.
 
    Adjustable  Portfolio may purchase and sell  put and call options on futures
contracts and enter into  closing transactions with respect  to such options  to
terminate existing positions. The Fund may use such options on futures contracts
in  connection with  its hedging  strategies in  lieu of  purchasing and writing
options directly  on the  underlying securities  or purchasing  and selling  the
underlying futures contracts.
 
    There  are risks in using futures contracts and options on futures contracts
as hedging  devices.  The primary  risks  associated  with the  use  of  futures
contracts  and  options thereon  are  (a) the  prices  of futures  contracts and
options may not  correlate perfectly  with the  market value  of the  underlying
security held by the Fund and (b) the possible lack of a liquid secondary market
for  a futures contract and the resulting  inability to close a futures position
prior to its maturity date. The risk that the Fund will be unable to close out a
futures position  will be  minimized by  entering into  such transactions  on  a
national exchange with an active and liquid secondary market.
 
    Additional  information  with respect  to futures  contracts and  options on
futures contracts is  set forth  in Appendix B  to the  Statement of  Additional
Information.
 
    The effective use of futures contracts, options on futures contracts and the
other  hedging  techniques  discussed  above  is  dependent  upon  the Adviser's
judgment regarding interest rate  movements and other  economic factors. To  the
extent  that this judgment  is incorrect, the  Fund will be  in a worse position
than if such hedging techniques had not been used.
 
ILLIQUID SECURITIES
 
    Adjustable Portfolio may  invest up  to 15% of  its net  assets in  illiquid
securities  and Money  Market Fund  may invest up  to 10%  of its  net assets in
illiquid  securities.  Illiquid  securities  may  offer  a  higher  yield   than
securities  which  are  more readily  marketable,  but  they may  not  always be
marketable on advantageous terms.
 
    The sale of  illiquid securities  often requires  more time  and results  in
higher  brokerage charges or  dealer discounts than does  the sale of securities
eligible for trading on national securities exchanges or in the over-the-counter
markets. A Fund may be  restricted in its ability to  sell such securities at  a
time
 
                                       22
<PAGE>
when  the Adviser  deems it advisable  to do so.  In addition, in  order to meet
redemption requests, a  Fund may  have to sell  other assets,  rather than  such
illiquid securities, at a time which is not advantageous.
 
    "Restricted securities" are securities which were originally sold in private
placements  and which have not been registered  under the Securities Act of 1933
(the "1933 Act"). Such securities generally have been considered illiquid, since
they may  be resold  only subject  to statutory  restrictions and  delays or  if
registered under the 1933 Act. In 1990, however, the SEC adopted Rule 144A under
the  1933  Act, which  provides a  safe harbor  exemption from  the registration
requirements of the 1933 Act for resales of restricted securities to  "qualified
institutional  buyers," as defined in the rule. The result of this rule has been
the development of a more liquid  and efficient institutional resale market  for
restricted  securities. Thus,  restricted securities  are no  longer necessarily
illiquid. Neither Fund is subject to any limitation on its ability to invest  in
securities  simply because such  securities are restricted.  (Money Market Fund,
however,  will  invest  only  in  U.S.  Government  Securities,  which  are  not
considered  restricted securities.) These  securities will be  treated as liquid
when they have been  determined to be  liquid by the Board  of Directors of  the
Funds  or by the Adviser subject to  the oversight of and pursuant to procedures
adopted by  the Board  of Directors.  See "Investment  Objectives, Policies  and
Restrictions -- Illiquid Securities" in the Statement of Additional Information.
Similar  determinations may be  made with respect to  commercial paper issued in
reliance upon  the so-called  "private  placement" exemption  from  registration
under  Section 4(2) of  the 1933 Act  and with respect  to IO and  PO classes of
Mortgage-Backed Securities issued  by the  U.S. Government or  its agencies  and
instrumentalities.
 
INVESTMENT RESTRICTIONS
 
    Each  Fund has adopted certain investment  restrictions, which are set forth
in  detail  in  the  Statement  of  Additional  Information  under   "Investment
Objectives,  Policies  and  Restrictions."  Certain  of  these  restrictions are
fundamental and may not be  changed without shareholder approval, including  the
following:  (1) Neither Fund will invest 25% or  more of its total assets in any
one industry.  (This  restriction does  not  apply  to securities  of  the  U.S.
Government  or  its  agencies and  instrumentalities  and  repurchase agreements
relating thereto or  to obligations  of United States  banks, domestic  branches
thereof  and United  States branches of  foreign banks subject  to United States
regulation. The  various types  of  utility companies,  such as  gas,  electric,
telephone,  telegraph,  satellite  and microwave  communications  companies, are
considered as separate industries.) (2) Neither  Fund will, with respect to  75%
of its total assets, invest more than 5% of the value of its total assets in the
securities  of any one issuer or acquire more than 10% of the outstanding voting
securities of an issuer, in each case other than securities issued or guaranteed
by the U.S. Government or any  agency or instrumentality thereof and  securities
of other investment companies.
 
    Except  with  respect  to  each Fund's  policy  concerning  borrowing,  if a
percentage restriction set forth in this Prospectus is adhered to at the time of
an investment, a later increase or decrease in percentage resulting from changes
in values or assets will not constitute a violation of such restriction.
 
PORTFOLIO TURNOVER
 
    While it is  not the policy  of Adjustable Portfolio  to trade actively  for
short-term  profits, the Fund  will dispose of securities  without regard to the
time they have  been held  when such action  appears advisable  to the  Adviser.
Frequent  changes  may result  in  higher transaction  and  other costs  for the
 
                                       23
<PAGE>
Fund. The method  of calculating  portfolio turnover rate  is set  forth in  the
Statement  of Additional Information under  "Investment Objectives, Policies and
Restrictions --  Portfolio Turnover."  Portfolio turnover  rates for  Adjustable
Portfolio are set forth in "Financial Highlights."
 
                                   MANAGEMENT
 
BOARD OF DIRECTORS
 
    The  Company's  Board  of  Directors  has  the  primary  responsibility  for
overseeing the overall management of the Company and electing its officers.
 
INVESTMENT ADVISER
 
    Piper Capital  Management Incorporated  (the  "Adviser") has  been  retained
under an Investment Advisory and Management Agreement with the Company to act as
the  Funds'  investment  adviser  subject  to  the  authority  of  the  Board of
Directors.
 
    In addition to acting as the  investment adviser for the Funds, the  Adviser
also  serves as investment adviser to a  number of other open-end and closed-end
investment companies and to various other concerns, including pension and profit
sharing funds, corporate funds  and individuals. As of  September 30, 1995,  the
Adviser  rendered  investment  advice regarding  approximately  $9.4  billion of
assets. The Adviser  is a  wholly owned  subsidiary of  Piper Jaffray  Companies
Inc.,  a publicly held corporation which  is engaged through its subsidiaries in
various aspects of the financial services  industry. The address of the  Adviser
is   Piper  Jaffray  Tower,  222  South  Ninth  Street,  Minneapolis,  Minnesota
55402-3804.
 
    The Adviser  furnishes each  Fund with  investment advice  and, in  general,
supervises  the management  and investment  programs of  the Funds.  The Adviser
furnishes at  its  own expense  all  necessary administrative  services,  office
space,  equipment and  clerical personnel for  servicing the  investments of the
Funds. The Adviser  also provides investment  advisory facilities and  executive
and  supervisory  personnel  for  managing  the  investments  and  effecting the
portfolio transactions of the Funds. In addition, the Adviser pays the  salaries
and  fees of all officers  and directors of the  Company who are affiliated with
the Adviser.
 
    Under the Investment Advisory and Management Agreement, the Adviser receives
a monthly fee computed separately for each Fund. Such fees are paid at an annual
rate of .15% and .30%,  respectively, of the average  daily net assets of  Money
Market Fund and Adjustable Portfolio.
 
PORTFOLIO MANAGEMENT
 
    Nancy  S. Olsen has been primarily responsible for the day-to-day management
of Money Market Fund's portfolio since the Fund's inception in 1993. Ms.  Olsen,
who  joined the  Adviser in 1987,  is a  Senior Vice President  and fixed income
portfolio manager  for  the  Adviser  and directs  the  Adviser's  cash  reserve
management department. Ms. Olsen has an M.B.A. from the University of Minnesota.
 
    Thomas  S.  McGlinch  has  been  primarily  responsible  for  the day-to-day
management of Adjustable  Portfolio's investment portfolio  since October  1994.
Mr.  McGlinch is  a vice  president and  fixed-income portfolio  manager for the
Adviser. Prior to joining the Adviser in 1992, Mr. McGlinch was an institutional
mortgage-backed securities trader for Piper Jaffray Inc. during 1992. From  1988
to  January 1992, Mr. McGlinch was a specialty products trader at FBS Investment
Services. He is a Chartered Financial Analyst ("C.F.A.") with an M.B.A. from the
University of St. Thomas.
 
                                       24
<PAGE>
TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN
 
    Investors Fiduciary Trust  Company ("IFTC"), 127  West Tenth Street,  Kansas
City,  Missouri  64105,  (800)  874-6205, serves  as  Custodian  for  the Funds'
portfolio securities  and cash  and as  Transfer Agent  and Dividend  Disbursing
Agent for the Funds.
 
    The  Company has entered into a Shareholder Account Servicing Agreement with
the Distributor  pursuant to  which the  Distributor provides  certain  transfer
agent  and  dividend disbursing  agent  services for  the  underlying individual
shareholder accounts. For more information,  see "Investment Advisory and  Other
Services  -- Transfer Agent  and Dividend Disbursing Agent"  in the Statement of
Additional Information.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE COMMISSIONS
 
    The Adviser selects brokers and futures commission merchants to use for  the
Fund's portfolio transactions. In making its selection, the Adviser may consider
a  number  of  factors, which  are  more  fully discussed  in  the  Statement of
Additional Information, including,  but not limited  to, research services,  the
reasonableness  of commissions and quality of services and execution. A broker's
sales of either  of the Funds'  shares may also  be considered a  factor if  the
Adviser  is  satisfied that  a  Fund would  receive  from that  broker  the most
favorable price  and  execution  then available  for  a  transaction.  Portfolio
transactions  for  the  Funds  may  be effected  through  the  Distributor  on a
securities exchange in compliance with Section  17(e) of the 1940 Act. For  more
information,  see "Portfolio  Transactions and  Allocation of  Brokerage" in the
Statement of Additional Information.
 
                                       25
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                         SHAREHOLDER GUIDE TO INVESTING
 
                             HOW TO PURCHASE SHARES
 
GENERAL
 
    The Funds' shares  may be purchased  at the public  offering price from  the
Distributor  and from  other broker-dealers who  have sales  agreements with the
Distributor.  The  address  of  the  Distributor  is  that  of  the  Funds.  The
Distributor reserves the right to reject any purchase order. You should be aware
that,  because the Funds  do not issue  stock certificates, Fund  shares must be
kept in an account with  the Distributor or with  IFTC. All investments must  be
arranged through your Piper Jaffray Investment Executive or other broker-dealer.
 
PURCHASE PRICE
 
    Shares  of Money Market Fund  are offered without a  sales charge at the net
asset value per share next calculated after receipt of your order by your  Piper
Jaffray  Investment Executive  or other broker-dealer.  The net  asset value per
share of such Fund is normally expected to be $1.00. See "Valuation of Shares".
 
    Shares of Adjustable Portfolio are offered at the net asset value per  share
next  calculated after  receipt of your  order by your  Piper Jaffray Investment
Executive or other broker-dealer, plus a front-end sales charge as follows:
 
<TABLE>
<CAPTION>
                                                                                                   DEALER
                                                        SALES CHARGE AS     SALES CHARGE AS     CONCESSION AS
                                                         PERCENTAGE OF     PERCENTAGE OF NET    PERCENTAGE OF
AMOUNT OF TRANSACTION AT OFFERING PRICE                 OFFERING PRICE        ASSET VALUE      OFFERING PRICE
- -----------------------------------------------------  -----------------  -------------------  ---------------
<S>                                                    <C>                <C>                  <C>
Less than $250,000...................................          1.00%               1.01%               .75%
$250,000 but less than $500,000......................           .50%                .50%              .375%
$500,000 and over....................................             0%                  0%                 0%
</TABLE>
 
    The Adviser and/or  the Distributor, out  of their own  assets, may pay  for
certain  expenses incurred in connection with  the distribution of shares of the
Funds. In  particular,  in connection  with  sales of  Adjustable  Portfolio  of
$500,000  or more, Piper Jaffray  Investment Executives and other broker-dealers
are paid an amount equal to .15% of the offering price of Fund shares  purchased
by  their clients.  In addition, Piper  Jaffray Investment  Executives and other
broker-dealers receive ongoing payments  for their servicing and/or  maintenance
of  shareholder accounts  in an amount  equal to  .06% of the  average daily net
assets of Money Market Fund attributable to shares sold by them and .15% of  the
average  daily net assets of Adjustable Portfolio attributable to shares sold by
them.
 
    The Distributor or the  Adviser, at their  own expense, provide  promotional
incentives to Investment Executives of the Distributor and to broker-dealers who
have sales agreements with the Distributor in connection with sales of shares of
the  Funds, and  other mutual  funds for  which the  Adviser acts  as investment
adviser. In  some instances,  these incentives  may be  made available  only  to
certain  Investment  Executives  or broker-dealers  who  have sold  or  may sell
significant amounts  of such  shares.  The incentives  may include  payment  for
travel  expenses, including  lodging at  luxury resorts,  incurred in connection
with sales seminars.
 
                                       26
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                         SHAREHOLDER GUIDE TO INVESTING
 
MINIMUM INVESTMENTS
 
    A minimum initial investment of $100,000 is required for each Fund. There is
no minimum for  subsequent investments.  The Distributor may  waive the  minimum
initial investment for clients of Piper Trust Company.
 
                           REDUCING YOUR SALES CHARGE
 
    Purchasers  of Adjustable Portfolio  may qualify for  a reduced sales charge
through one  or  more of  several  plans. You  must  notify your  Piper  Jaffray
Investment  Executive or broker-dealer at the time of purchase to take advantage
of these plans.
 
AGGREGATION
 
    Front-end or initial sales charges of Adjustable Portfolio may be reduced or
eliminated by  aggregating  your  purchase with  purchases  of  certain  related
personal  accounts. In addition, purchases made  by members of certain organized
groups will  be aggregated  for  purposes of  determining sales  charges.  Sales
charges  are calculated by adding the dollar  amount of your current purchase to
the higher of the cost or current value of shares of any Piper fund sold with  a
sales  charge that  are currently held  by you  and your related  accounts or by
other members of your group.
 
    QUALIFIED GROUPS.    You  may  group purchases  in  the  following  personal
accounts together:
 
    - Your individual account.
 
    - Your spouse's account.
 
    - Your children's accounts (if they are under the age of 21).
 
    - Your  employee  benefit plan  accounts if  they  are exclusively  for your
      benefit. This includes accounts such  as IRAs, individual 403(b) plans  or
      single-participant Keogh-type plans.
 
    - A  single trust estate or single fiduciary  account if you are the trustee
      or fiduciary.
 
    Additionally, purchases made by members  of any organized group meeting  the
requirements  listed below may  be aggregated for  purposes of determining sales
charges:
 
    - The group has been in existence for more than six months.
 
    - It is not organized for the  purpose of buying redeemable securities of  a
      registered investment company.
 
    - Purchases  must be  made through  a central  administration, or  through a
      single dealer, or by other means that result in economy of sales effort or
      expense.
 
    An organized  group does  not  include a  group  of individuals  whose  sole
organizational  connection is participation as credit card holders of a company,
policyholders  of  an  insurance  company,   customers  of  either  a  bank   or
broker-dealer or clients of an investment adviser.
 
RIGHT OF ACCUMULATION
 
    Sales  charges  for  purchases  of Adjustable  Portfolio  shares  into Piper
Jaffray accounts will be automatically calculated taking into account the dollar
amount of any new purchases along with the
 
                                       27
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                         SHAREHOLDER GUIDE TO INVESTING
higher of current  value or  cost of shares  previously purchased  in the  Piper
funds  that were sold with a sales charge. For other broker-dealer accounts, you
should notify your Investment  Executive at the time  of purchase of  additional
Piper fund shares you may own.
 
LETTER OF INTENT
 
    Your  sales  charge for  Adjustable Portfolio  may be  reduced by  signing a
non-binding Letter of Intent. This Letter of Intent will state your intention to
invest $100,000 or more in any of the Piper funds sold with a sales charge  over
a 13-month period, beginning not earlier than 90 days prior to the date you sign
the  Letter. You will pay the lower  sales charge applicable to the total amount
you plan to invest over the 13-month period. Part of your shares will be held in
escrow to cover additional sales  charges that may be due  if you do not  invest
the  planned  amount.  Please  see  "Purchase of  Shares"  in  the  Statement of
Additional Information  for more  details. You  can contact  your Piper  Jaffray
Investment Executive or other broker-dealer for an application.
 
                             SPECIAL PURCHASE PLANS
 
    For more information on any of the following special purchase plans, contact
your Piper Jaffray Investment Executive or other broker-dealer.
 
PURCHASES BY PIPER JAFFRAY COMPANIES INC., ITS SUBSIDIARIES AND ASSOCIATED
PERSONS
 
    Piper  Jaffray  Companies  Inc.  and  its  subsidiaries  may  buy  shares of
Adjustable Portfolio without  incurring a  sales charge.  The following  persons
associated  with such entities also  may buy such shares  without paying a sales
charge:
 
    - Officers, directors and partners.
 
    - Employees and retirees.
 
    - Sales representatives.
 
    - Spouses or children under the age of 21 of any of the above.
 
    - Any trust, pension, profit-sharing  or other benefit plan  for any of  the
      above.
 
PURCHASES BY BROKER-DEALERS
 
    Employees  of broker-dealers who have entered into sales agreements with the
Distributor, and spouses and children under the age of 21 of such employees, may
buy shares of Adjustable Portfolio without incurring a sales charge.
 
PURCHASES BY OTHER INDIVIDUALS WITHOUT A SALES CHARGE
 
    The following  other  individuals  and  entities  also  may  buy  shares  of
Adjustable Portfolio without paying a sales charge:
 
    - Clients of the Adviser buying shares in their advisory accounts.
 
    - Discretionary   accounts  at  Piper  Trust  Company  and  participants  in
      investment companies exempt from registration under the 1940 Act that  are
      managed by the Adviser.
 
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                         SHAREHOLDER GUIDE TO INVESTING
 
    - Trust  companies and  bank trust departments  using funds  over which they
      exercise exclusive discretionary investment  authority and which are  held
      in a fiduciary, agency, advisory, custodial or similar capacity.
 
    - Investors  purchasing shares through a  Piper Jaffray Investment Executive
      if the purchase of such shares is funded by the proceeds from the sale  of
      shares  of any  non-money market open-end  mutual fund.  This privilege is
      available for 30 days after the sale.
 
    - American Government Term Trust Inc.  ("AGT"), a closed-end fund which  was
      managed  by the Adviser, recently dissolved and distributed its net assets
      to shareholders.  Former AGT  shareholders  may invest  the  distributions
      received by them in connection with such dissolution in shares of the Fund
      without payment of a sales charge.
 
PURCHASES BY EMPLOYEE BENEFIT PLANS AND TAX-SHELTERED ANNUITIES
 
    - Shares  of Adjustable Portfolio will be sold at net asset value, without a
      sales charge, to employee benefit plans containing an actively  maintained
      qualified  cash  or  deferred  arrangement  under  Section  401(k)  of the
      Internal Revenue Code of 1986, as amended (the "Code") (a "401(k)  Plan").
      In the event a 401(k) Plan of an employer has purchased shares in the Fund
      during  any  calendar quarter,  any other  employee  benefit plan  of such
      employer that is a  qualified plan under Section  401(a) of the Code  also
      may  purchase shares of  the Fund during such  quarter without incurring a
      sales charge.
 
    - Custodial  accounts  under   Section  403(b)   of  the   Code  (known   as
      tax-sheltered  annuities)  also  may buy  shares  of  Adjustable Portfolio
      without incurring a sales charge.
 
                              HOW TO REDEEM SHARES
 
NORMAL REDEMPTION
 
    You may redeem all or a portion of your shares on any day that a Fund values
its shares. (Please refer to "Valuation of Shares" below for more  information.)
Your  shares will be redeemed  at the net asset  value next calculated after the
receipt of  your instructions  in good  form by  your Piper  Jaffray  Investment
Executive or other broker-dealer as explained below.
 
    PIPER  JAFFRAY INC.  ACCOUNTS.  To  redeem your shares,  please contact your
Piper Jaffray Investment Executive with an oral request to redeem your shares.
 
    OTHER BROKER-DEALER ACCOUNTS.  To redeem your shares, you may either contact
your broker-dealer with an  oral request or send  a written request directly  to
the  Funds' transfer agent, IFTC. This request should contain: the dollar amount
or number of shares to be redeemed, your Fund account number and either a social
security or  tax identification  number (as  applicable). You  should sign  your
request in exactly the same way the account is registered. If there is more than
one owner of the shares, all owners must sign. A signature guarantee is required
for  redemptions over  $25,000. Please contact  IFTC or refer  to "Redemption of
Shares" in the Statement of Additional Information for more details.
 
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                         SHAREHOLDER GUIDE TO INVESTING
 
PAYMENT OF REDEMPTION PROCEEDS
 
    After your shares  have been redeemed,  the cash proceeds  will normally  be
sent  to you or your broker-dealer within  three business days. In no event will
payment be made more than seven days  after receipt of your order in good  form.
However,  payment may be postponed or the right of redemption suspended for more
than seven days under unusual circumstances, such as when trading is not  taking
place on the New York Stock Exchange. Payment of redemption proceeds may also be
delayed  if the shares to be redeemed were  purchased by a check drawn on a bank
which is not  a member of  the Federal  Reserve System, until  such checks  have
cleared the banking system (normally up to 15 days from the purchase date).
 
REDEMPTION IN KIND
 
    Although  it is the current policy of Adjustable Portfolio to pay redemption
proceeds in cash,  redemption proceeds  for redemption requests  of $100,000  or
more  may be paid,  at the sole option  of Adjustable Portfolio,  in whole or in
part by a distribution in kind of securities or other assets held by  Adjustable
Portfolio.  The determination of which of  Adjustable Portfolio's assets will be
distributed to meet  such redemption requests  will be made  by the Adviser,  in
consultation  with  the redeeming  shareholder.  Securities or  other  assets so
distributed will  be  valued  in  the  same  manner  as  Adjustable  Portfolio's
securities.  In  order  to  dispose  of such  securities  or  other  assets, the
redeeming shareholder would most likely be required to bear transaction costs.
 
INVOLUNTARY REDEMPTION
 
    Each Fund reserves  the right to  redeem your  account at any  time the  net
asset  value of the account falls below $50,000 as the result of a redemption or
exchange request. You will be notified  in writing prior to any such  redemption
and will be allowed 30 days to make additional investments before the redemption
is processed.
 
                              SHAREHOLDER SERVICES
 
REINSTATEMENT PRIVILEGE
 
    If  you have  redeemed shares of  Adjustable Portfolio, you  may reinvest in
shares of Adjustable Portfolio  without payment of  an additional sales  charge.
The reinvestment request must be made within 120 days of the redemption. You may
also reinvest within this time period in shares of any other mutual fund managed
by  the  Adviser  except that,  if  that fund  has  a higher  sales  charge than
Adjustable Portfolio, you must pay the difference. This privilege is subject  to
the  eligibility  of  share purchases  in  your  state as  well  as  the minimum
investment requirements and any other applicable terms in the prospectus of  the
fund being acquired.
 
EXCHANGE PRIVILEGE
 
    If  your investment  goals change,  you may prefer  a fund  with a different
objective. If you are considering an  exchange into another mutual fund  managed
by  the  Adviser,  you  should carefully  read  the  appropriate  prospectus for
additional information about  that fund.  A prospectus may  be obtained  through
your  Piper Jaffray Investment Executive, your broker-dealer or the Distributor.
To exchange your shares, please contact your Piper Jaffray Investment Executive,
your broker-dealer or IFTC.
 
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                         SHAREHOLDER GUIDE TO INVESTING
 
    You may exchange your shares for shares of any other mutual fund managed  by
the  Adviser that  is open to  new investors.  All exchanges are  subject to the
eligibility of share purchases in your  state as well as the minimum  investment
requirements  and any other applicable terms in the prospectus of the fund being
acquired. Exchanges are made on the basis  of the net asset values of the  funds
involved,  except that investors exchanging into a fund which has a higher sales
charge must pay the difference.
 
    You may make four  exchanges per year without  payment of a service  charge.
Thereafter,  you will  pay a  $5 service charge  for each  exchange. The Company
reserves the  right to  change or  discontinue the  exchange privilege,  or  any
aspect of the privilege, upon 60 days' written notice.
 
TELEPHONE TRANSACTION PRIVILEGES
 
    PIPER  JAFFRAY INC. ACCOUNTS.   If you  hold your shares  in a Piper Jaffray
account, you may telephone your Investment Executive to execute any  transaction
or to apply for many shareholder services. In some cases, you may be required to
complete a written application.
 
    OTHER  BROKER-DEALER ACCOUNTS.  If  you hold your shares  in an account with
your broker-dealer  or  at  IFTC,  you may  authorize  telephone  privileges  by
completing  the  Account  Application  and Services  Form.  Please  contact your
broker-dealer or IFTC (800-874-6205) for an application or for more details. The
Funds will employ reasonable procedures to confirm that a telephonic request  is
genuine,  including requiring that payment be made only to the address of record
or the bank account designated on the Account Application and Services Form  and
requiring  certain  means of  telephonic identification.  A Fund  employing such
procedures will  not  be  liable  for  following  instructions  communicated  by
telephone  that it reasonably believes to be  genuine. If a Fund does not employ
such procedures,  it  may  be liable  for  any  losses due  to  unauthorized  or
fraudulent  telephone transactions.  It may be  difficult to reach  the Funds by
telephone during periods when market or economic conditions lead to an unusually
large volume of telephone requests. If you cannot reach the Funds by  telephone,
you  should contact your broker-dealer or  issue written instructions to IFTC at
the address  set  forth herein.  See  "Management --  Transfer  Agent,  Dividend
Disbursing  Agent  and Custodian."  The Funds  reserve the  right to  suspend or
terminate their telephone services at any time without notice.
 
DIRECTED DIVIDENDS
 
    You may  direct  income dividends  and  capital gains  distributions  to  be
invested  in any other  mutual fund managed  by the Adviser  (other than a money
market fund) that is offered in your state. This investment will be made at  net
asset  value. It will not be subject  to a minimum investment amount except that
you must hold shares in such fund (including the shares being acquired with  the
dividend  or distribution) with  a value at  least equal to  such fund's minimum
initial investment amount.
 
SYSTEMATIC WITHDRAWAL PLAN
 
    If your  account  has  a value  of  $5,000  or more,  you  may  establish  a
Systematic  Withdrawal Plan for either of the Funds. This plan will allow you to
receive regular periodic payments by redeeming as many shares from your  account
as   necessary.   As   with  other   redemptions,   a  redemption   to   make  a
 
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                         SHAREHOLDER GUIDE TO INVESTING
withdrawal is a  sale for  federal income tax  purposes. Payments  made under  a
Systematic  Withdrawal Plan cannot be considered as actual yield or income since
part of the payments may be a return of capital.
 
    A request to  establish a Systematic  Withdrawal Plan must  be submitted  in
writing to your Piper Jaffray Investment Executive or other broker-dealer. There
are no service charges for maintenance; the minimum amount that you may withdraw
each  period is $100. You will be required  to have any income dividends and any
capital gains distributions reinvested. You may choose to have withdrawals  made
monthly, quarterly or semiannually. Please contact your Piper Jaffray Investment
Executive, other broker-dealer or IFTC for more information.
 
    With  respect to Adjustable  Portfolio, you should  be aware that additional
investments in an account that has  an active Systematic Withdrawal Plan may  be
inadvisable   due  to  sales  charges  and  tax  liabilities.  Please  refer  to
"Redemption of Shares" in the Statement of Additional Information for additional
details.
 
ACCOUNT PROTECTION
 
    If you  purchased  your  shares  of either  Fund  through  a  Piper  Jaffray
Investment  Executive,  you  may  choose  from  several  account  options.  Your
investments in a  Fund held  in a Piper  Jaffray account  (except for  non-"PAT"
accounts)  would be protected  up to $25 million.  Investments held in non-"PAT"
Piper Jaffray  accounts are  protected up  to $2.5  million. In  each case,  the
Securities   Investor  Protection  Corporation  ("SIPC")  provides  $500,000  of
protection; the additional coverage is provided  by The Aetna Casualty &  Surety
Company.  This protection does not cover any  declines in the net asset value of
Fund shares.
 
CONFIRMATION OF TRANSACTIONS AND REPORTING OF OTHER INFORMATION
 
    Each time  there is  a transaction  involving your  Fund shares,  such as  a
purchase,  redemption or dividend reinvestment,  you will receive a confirmation
statement describing that  activity. This  information will be  provided to  you
from  either Piper  Jaffray, your broker-dealer  or IFTC. In  addition, you will
receive various IRS forms after the  first of each year detailing important  tax
information.  Each Fund is required to supply annual and semiannual reports that
list securities held by the Fund and include the current financial statements of
the Fund.
 
    HOUSEHOLDING.  If  you have multiple  accounts with Piper  Jaffray, you  may
receive  some of the above information in  combined mailings. This will not only
help to reduce  Fund expenses,  it will help  the environment  by saving  paper.
Please contact your Piper Jaffray Investment Executive for more information.
 
                          DIVIDENDS AND DISTRIBUTIONS
 
    The  net investment income of each Fund  will be declared as dividends daily
and will  be  paid  monthly.  Net  realized  capital  gains,  if  any,  will  be
distributed  on an annual basis. For Adjustable Portfolio, shares begin accruing
dividends on the date on which payment for such shares has been received by  the
Distributor  or IFTC,  as appropriate, and  shares redeemed  will earn dividends
through the day prior  to settlement of the  redemption. For Money Market  Fund,
shares will begin accruing
 
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                         SHAREHOLDER GUIDE TO INVESTING
dividends  on the date  on which payment  is received, provided  such payment is
received by 12:00 noon,  New York time.  If a redemption  request for shares  of
Money  Market Fund  is received  by 12:00  noon, New  York time,  shares will be
redeemed that day and a dividend will not be earned.
 
    Adjustable Portfolio may at times pay out less than the entire amount of net
investment income earned in any particular period in order to permit the Fund to
maintain a more stable level of  distributions. Any such amount retained by  the
Fund  would be  available to  stabilize future  distributions. As  a result, the
distributions paid by the  Fund for any  particular period may  be more or  less
than the amount of net investment income earned by the Fund during such period.
 
    DISTRIBUTION  OPTIONS.  All net investment income dividends and net realized
capital gains distributions for a Fund  generally will be payable in  additional
shares  of that Fund at net asset  value ("Reinvestment Option"). If you wish to
receive  your  distributions  in  cash,  you  must  notify  your  Piper  Jaffray
Investment  Executive or  other broker-dealer. You  may elect  either to receive
income dividends in cash and capital gains distributions in additional shares of
the Fund  at  net  asset value  ("Split  Option"),  or to  receive  both  income
dividends  and capital gains distributions in cash ("Cash Option"). You may also
direct income  dividends  and capital  gains  distributions to  be  invested  in
another  mutual  fund  managed  by the  Adviser.  See  "Shareholder  Services --
Directed Dividends," above. The  taxable status of  income dividends and/or  net
capital  gains distributions is  not affected by whether  they are reinvested or
paid in cash.
 
                                       33
<PAGE>
                              VALUATION OF SHARES
 
    The  Funds determine their  net asset value  on each day  the New York Stock
Exchange (the "Exchange") is  open for business. The  calculation is made as  of
the  regular close of the Exchange (currently 4:00 p.m. New York time) after the
Funds have  declared any  applicable dividends.  The net  asset value  of  Money
Market Fund is also determined each business day at 12:00 noon (New York time).
 
    The  net asset  value per  share for  Adjustable Portfolio  is determined by
dividing the value of the securities owned  by the Fund plus any cash and  other
assets  (including interest  accrued and  dividends declared  but not collected)
less all liabilities by the number  of Fund shares outstanding. For the  purpose
of  determining  the  aggregate net  assets  of Adjustable  Portfolio,  cash and
receivables will be valued at their  face amounts. Interest will be recorded  as
accrued and dividends will be recorded on the ex-dividend date.
 
    The  value of certain  fixed-income securities held  by Adjustable Portfolio
will be  provided by  an  independent pricing  service, which  determines  these
valuations  at a time earlier  than the close of  the Exchange. Pricing services
consider such factors  as security  prices, yields,  maturities, call  features,
rating   and  developments  relating  to  specific  securities  in  arriving  at
securities  valuations.  Fixed-income  securities  for  which  prices  are   not
available  from an independent pricing service but where an active market exists
will be valued using  market quotations obtained from  one or more dealers  that
make  markets in the securities. Occasionally events affecting the value of such
securities may occur between the time valuations are determined and the close of
the Exchange. If events materially affecting the value of such securities  occur
during  such  period, or  if  management determines  for  any other  reason that
valuations provided by the pricing service are inaccurate, such securities  will
be valued at their fair value according to procedures decided upon in good faith
by the Company's Board of Directors. In addition, any securities or other assets
of  Adjustable Portfolio for which market  prices are not readily available will
be valued at their fair value in accordance with such procedures.
 
    It is the policy of Money Fund to attempt to maintain a net asset value  per
share  of $1.00. The securities held are  valued on the basis of amortized cost,
in accordance with the Fund's election  to operate under the provisions of  Rule
2a-7 under the 1940 Act. The amortized cost method of valuation involves valuing
an  instrument at  its cost and  thereafter assuming a  constant amortization to
maturity of  a discount  or premium,  regardless of  the impact  of  fluctuating
interest rates on the market value of the instrument. While this method provides
certainty  in  valuation,  it  may  result  in  periods  during  which  value as
determined by amortized cost is  higher or lower than  the price the Fund  would
receive  if  it  sold  the  instrument. Under  the  direction  of  the  Board of
Directors, procedures have been adopted to  monitor and stabilize the price  per
share. Calculations are made to compare the value of the Fund's portfolio valued
at  amortized cost with market values. In the event that a deviation of one-half
of 1% or more exists  between the $1.00 per share  net asset value for the  Fund
and  the net  asset value  calculated by reference  to market  quotations, or if
there is any other deviation which the Board of Directors believes would  result
in  a material  dilution to shareholders  or purchasers, the  Board of Directors
will promptly consider what action, if any, should be initiated. See "Net  Asset
Value and Public Offering Price" in the Statement of Additional Information.
 
                                       34
<PAGE>
                                   TAX STATUS
 
    Each  Fund is  treated as a  separate corporation for  federal tax purposes.
Therefore, each Fund is treated  separately in determining whether it  qualifies
as  a  regulated investment  company  and for  purposes  of determining  the net
ordinary  income  (or  loss),  net  realized  capital  gains  (or  losses)   and
distributions  necessary  to  relieve  such  Fund  of  any  federal  income  tax
liability.  Each  Fund  qualified  as  a  regulated  investment  company   under
Subchapter  M of  the Internal  Revenue Code of  1986, as  amended (the "Code"),
during its last taxable  year and intends to  qualify as a regulated  investment
company  during the current  taxable year. If  so qualified, a  Fund will not be
liable for federal income taxes to the extent it distributes its taxable  income
to shareholders.
 
    Distributions  by  a Fund  are  generally taxable  to  shareholders, whether
received in cash or additional shares of  the Fund (or shares of another  mutual
fund  managed by the Adviser). Distributions of net capital gains (designated as
"capital gain  dividends")  by Adjustable  Portfolio,  if any,  are  taxable  to
shareholders  as long-term capital  gains, regardless of the  length of time the
shareholder has held the shares of the Fund.
 
    A shareholder  will  recognize a  capital  gain or  loss  upon the  sale  or
exchange  of Fund  shares if, as  is normally  the case, the  shares are capital
assets in the shareholder's hands. This  capital gain or loss will be  long-term
if the shares have been held for more than one year.
 
    The foregoing relates to federal income taxation as in effect as of the date
of  this Prospectus. For  a more detailed  discussion of the  federal income tax
consequences of  investing  in  shares  of the  Funds,  see  "Taxation"  in  the
Statement  of Additional Information.  Before investing in  either of the Funds,
you should check the consequences of your local and state tax laws.
 
                            PERFORMANCE COMPARISONS
 
    Advertisements and other sales literature for Adjustable Portfolio may refer
to the Fund's "average  annual total return" and  "cumulative total return."  In
addition,  both Funds may provide yield calculations in advertisements and other
sales literature. All  such yield  and total  return quotations  are based  upon
historical earnings and are not intended to indicate future performance.
 
    Yield  calculations for  Adjustable Portfolio  will be  based upon  a 30-day
period stated in the  advertisement and will be  calculated by dividing the  net
investment  income per share (as defined under SEC rules and regulations) earned
during the advertised  period by  the offering  price per  share (including  the
maximum  sales charge) on  the last day of  the period. The  result will then be
"annualized" using  a  formula  that provides  for  semi-annual  compounding  of
income.  Money Market Fund may advertise  its "yield" and "effective yield." The
"yield" of Money Market Fund refers to the income generated by an investment  in
the  Fund over a  seven-day period stated  in the advertisement.  This income is
then "annualized." That  is, the amount  of income generated  by the  investment
during  that week is assumed to be generated each week over a 52-week period and
is shown as a percentage of the investment. The "effective yield" is  calculated
similarly  but, when annualized, the income earned  by an investment in the Fund
is assumed to be reinvested. The "effective yield" will be slightly higher  than
the "yield" because of the compounding effect of this assumed reinvestment.
 
    Average  annual total return is the average annual compounded rate of return
on a hypothetical  $1,000 investment  made at  the beginning  of the  advertised
period.  Cumulative  total return  is calculated  by subtracting  a hypothetical
$1,000   payment   to   the   Fund   from   the   redeemable   value   of   such
 
                                       35
<PAGE>
payment  at the end of the advertised period, dividing such difference by $1,000
and  multiplying  the  quotient  by  100.  In  calculating  average  annual  and
cumulative  total  return,  the  maximum  sales  charge  is  deducted  from  the
hypothetical investment and all  dividends and distributions  are assumed to  be
reinvested.
 
    In  addition to advertising total  return and yield, comparative performance
information may be used from time to time in advertising the Funds' shares.  For
example,  advertisements may  compare a  Fund's performance  to that  of various
unmanaged market indices, or may include performance data from Lipper Analytical
Services, Inc., Morningstar, Inc. or other entities or organizations which track
the performance of investment companies.
 
    For additional information regarding comparative performance information and
the calculation  of yield,  average  annual total  return and  cumulative  total
return,   see  "Performance   Comparisons"  in   the  Statement   of  Additional
Information.
 
    Advertisements and  other  sales literature  may  also refer  to  Adjustable
Portfolio's  effective duration. Effective duration  estimates the interest rate
risk (price volatility) of a security, I.E., how much the value of the  security
is  expected  to change  with a  given change  in interest  rates. The  longer a
security's effective duration,  the more sensitive  its price is  to changes  in
interest  rates. For  example, if  interest rates  were to  increase by  1%, the
market value of a bond with an  effective duration of five years would  decrease
by  about  5%,  with  all  other factors  being  constant.  It  is  important to
understand that,  while  a valuable  measure,  effective duration  is  based  on
certain  assumptions and has several limitations. It is most useful as a measure
of interest rate  risk when  interest rate changes  are small,  rapid and  occur
equally  across  all  the different  points  of  the yield  curve.  In addition,
effective duration is difficult to calculate precisely for bonds with prepayment
options, such as  mortgage-backed securities, because  the calculation  requires
assumptions  about prepayment rates.  For example, when  interest rates go down,
homeowners may  prepay their  mortgages at  a higher  rate than  assumed in  the
initial   effective  duration  calculation,  thereby  shortening  the  effective
duration of Adjustable  Portfolio's mortgage-backed  securities. Conversely,  if
rates  increase,  prepayments may  decrease to  a  greater extent  than assumed,
extending the  effective duration  of such  securities. For  these reasons,  the
effective  durations of funds which invest a significant portion of their assets
in mortgage-backed securities, particularly mortgage derivative securities,  can
be greatly affected by changes in interest rates.
 
                              GENERAL INFORMATION
 
    The  Company is authorized to issue a  total of 10 trillion shares of common
stock with a par value of $.01 per  share. One hundred and ten billion of  these
shares  have  been authorized  by the  Board of  Directors to  be issued  in two
separate series: ten billion shares designated as Series A Common Shares,  which
are  the shares of common stock of Adjustable Portfolio, and one hundred billion
shares designated as  Series B  Common Shares, which  are the  shares of  common
stock of Money Market Fund.
 
    The  Board  of  Directors  is  empowered  under  the  Company's  Articles of
Incorporation to  issue  other series  of  the Company's  common  stock  without
shareholder   approval.  In  addition,  the  Board  of  Directors  may,  without
shareholder approval, create and issue one or more additional classes of  shares
within  each Fund, as  well as within any  series of the  Company created in the
future. See  "Capital  Stock  and  Ownership of  Shares"  in  the  Statement  of
Additional Information.
 
                                       36
<PAGE>
    All  shares, when issued, will  be fully paid and  nonassessable and will be
redeemable. All shares have equal voting rights.  They can be issued as full  or
fractional  shares. A fractional share has pro-rata  the same kind of rights and
privileges as  a full  share. The  shares possess  no preemptive  or  conversion
rights.
 
    Each  share  of  a  series  has  one  vote  (with  proportionate  voting for
fractional shares) irrespective of the relative  net asset value of the  series'
shares.  On some issues,  such as the  election of directors,  all shares of the
Company vote together  as one series.  On an issue  affecting only a  particular
series,  the shares of the affected series vote separately. Cumulative voting is
not authorized. This  means that  the holders  of more  than 50%  of the  shares
voting  for the election  of directors can  elect 100% of  the directors if they
choose to do so, and, in such event, the holders of the remaining shares will be
unable to elect any directors.
 
    The Bylaws of  the Company provide  that shareholder meetings  be held  only
with  such frequency as required under  Minnesota law. Minnesota corporation law
requires only that the Board of  Directors convene shareholder meetings when  it
deems appropriate. In addition, Minnesota law provides that if a regular meeting
of  shareholders has not been held during the immediately preceding 15 months, a
shareholder or  shareholders holding  3% or  more of  the voting  shares of  the
Company  may demand a regular meeting of shareholders by written notice given to
the chief executive officer or chief financial officer of the Company. Within 30
days after receipt of the demand, the  Board of Directors shall cause a  regular
meeting  of shareholders to be called, which meeting shall be held no later than
90 days after  receipt of  the demand,  all at the  expense of  the Company.  In
addition,  the  1940  Act requires  a  shareholder  vote for  all  amendments to
fundamental investment  policies  and restrictions  and  for all  amendments  to
investment  advisory contract. The 1940 Act  also provides that Directors of the
Company may be removed by action of the record holders of two-thirds or more  of
the  outstanding shares  of the  Company. The Directors  are required  to call a
meeting of shareholders for the purpose  of voting upon the question of  removal
of  any Director when so requested in writing  by the record holders of at least
10% of the Company's outstanding shares.
 
PENDING LEGAL PROCEEDINGS
 
    Complaints have  been  brought  against  the  Adviser  and  the  Distributor
relating to certain investment companies for which the Adviser acts or has acted
as  investment adviser or subadviser. These lawsuits do not involve the Funds. A
number of complaints have  been brought in federal  and state court against  the
Institutional  Government Income Portfolio ("PJIGX") series of Piper Funds Inc.,
the Adviser, the  Distributor, and  certain individuals  affiliated or  formerly
affiliated  with the Adviser  and the Distributor.  In addition, complaints have
been filed  in federal  court  relating to  a  number of  closed-end  investment
companies managed by the Adviser and two open-end investment companies for which
the  Adviser has acted as sub-adviser.  The complaints, which ask for rescission
of plaintiff  shareholders' purchases  or compensatory  damages, plus  interest,
costs  and expenses, generally allege, among other things, certain violations of
federal and/or  state  securities  laws,  including  the  making  of  materially
misleading  statements in prospectuses concerning investment policies and risks.
See "Pending Litigation" in the Statement of Additional Information.
 
    On February  13,  1996, a  Settlement  Agreement became  effective  for  the
consolidated  class action lawsuit, titled In Re: PIPER FUNDS INC. INSTITUTIONAL
GOVERNMENT INCOME PORTFOLIO  LITIGATION. The Amended  Consolidated Class  Action
Complaint  was filed on  October 5, 1994,  in the United  States District Court,
District of  Minnesota, against  PJIGX,  Piper Capital  Management  Incorporated
 
                                       37
<PAGE>
("PCM"),  Piper Jaffray  Inc., William  H. Ellis and  Edward J.  Kohler, and had
alleged the making of materially misleading statements in the prospectus, common
law negligent misrepresentation  and breach  of fiduciary  duty. The  Settlement
Agreement  will  provide  approximately $67.5  million,  together  with interest
earned, less  certain  disbursements and  attorney  fees, to  class  members  in
payments scheduled over approximately three years. Such payments will be made by
Piper  Jaffray Companies  Inc. and PCM  and will  not be an  obligation of Piper
Funds Inc. Three lawsuits and  a number of arbitrations  brought by some of  the
investors who requested exclusion from the settlement class remain pending.
 
    The  Adviser and the Distributor do not believe that the PJIGX settlement or
any outstanding complaint or action in arbitration will have a material  adverse
effect  on their ability to perform under their agreements with the Company or a
material adverse effect on  the Funds, and they  intend to defend such  lawsuits
and actions vigorously.
 
    NO  DEALER, SALES REPRESENTATIVE OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE
ANY INFORMATION OR  TO MAKE ANY  REPRESENTATIONS OTHER THAN  THOSE CONTAINED  IN
THIS  PROSPECTUS (AND/OR IN THE STATEMENT  OF ADDITIONAL INFORMATION REFERRED TO
ON THE COVER PAGE OF THIS PROSPECTUS),  AND, IF GIVEN OR MADE, SUCH  INFORMATION
OR  REPRESENTATIONS MUST  NOT BE  RELIED UPON AS  HAVING BEEN  AUTHORIZED BY THE
FUNDS OR PIPER  JAFFRAY INC.  THIS PROSPECTUS DOES  NOT CONSTITUTE  AN OFFER  OR
SOLICITATION  BY ANYONE IN ANY STATE IN  WHICH SUCH OFFER OR SOLICITATION IS NOT
AUTHORIZED, OR IN  WHICH THE  PERSON MAKING SUCH  OFFER OR  SOLICITATION IS  NOT
QUALIFIED  TO DO SO, OR TO ANY PERSON TO  WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER
OR SOLICITATION.
 
                                       38
<PAGE>
                                   APPENDIX A
                         FOREIGN CURRENCY TRANSACTIONS
 
    As noted in the Prospectus, Adjustable Portfolio may invest up to 10% of its
assets  in securities denominated in  Canadian dollars. Adjustable Portfolio may
engage in foreign currency exchange transactions to protect against  uncertainty
in the level of the rate of exchange between Canadian and U.S. dollars. The Fund
may  engage in  such transactions  in connection with  the purchase  and sale of
portfolio securities  ("transaction  hedging")  and  to  protect  the  value  of
specific portfolio positions ("position hedging").
 
    Adjustable  Portfolio may engage in transaction hedging to protect against a
change in the  exchange rate between  the date  on which the  Fund contracts  to
purchase  or sell the security and the settlement date, or to "lock in" the U.S.
dollar equivalent of  a dividend or  interest payment in  Canadian dollars.  For
that  purpose, Adjustable Portfolio  may purchase or sell  Canadian dollars on a
spot (or  cash)  basis  at the  prevailing  spot  rate in  connection  with  the
settlement  of  transactions  in portfolio  securities  denominated  in Canadian
dollars. If  conditions  warrant,  Adjustable  Portfolio  may  also  enter  into
contracts  to  purchase or  sell  Canadian dollars  at  a future  date ("forward
contracts") and purchase  and sell Canadian  dollars or futures  contracts as  a
hedge  against changes in  Canadian dollars or exchange  rates between the trade
and settlement  dates on  particular  transactions and  not for  speculation.  A
foreign currency forward contract is a negotiated agreement to exchange currency
at  a future time at a  rate or rates that may be  higher or lower than the spot
rate.  Foreign  currency  futures  contracts  are  standardized  exchange-traded
contracts  and  have  margin  requirements.  For  transaction  hedging purposes,
Adjustable Portfolio may also purchase exchange-listed and over-the-counter call
and put options on Canadian dollars  or futures contracts thereon. A put  option
on a futures contract gives the Fund the right to assume a short position in the
futures  contract until expiration of the option. A put option on currency gives
the Fund the right to sell a currency at an exercise price until the  expiration
of  the option. A call option on a  futures contract gives the Fund the right to
assume a  long position  in the  futures contract  until the  expiration of  the
option.  A  call option  on  currency gives  the Fund  the  right to  purchase a
currency at the exercise price until the expiration of the option.
 
    Adjustable Portfolio may  engage in  position hedging to  protect against  a
decline  in the value relative to the U.S. dollar in its securities, denominated
in Canadian dollars  (or an increase  in the  value of the  Canadian dollar  for
securities  which  the Fund  intends to  buy,  when it  holds cash  reserves and
short-term investments). For position hedging purposes, Adjustable Portfolio may
purchase or sell Canadian  dollar futures contracts  and forward contracts,  and
may  purchase put or  call options on  Canadian dollars or  on futures contracts
thereon on exchanges  or over-the-counter markets.  In connection with  position
hedging,  Adjustable Portfolio may  also purchase or sell  Canadian dollars on a
spot basis.
 
    The  precise  matching   of  the  amounts   of  foreign  currency   exchange
transactions  and  the  value  of the  portfolio  securities  involved  will not
generally be  possible since  the future  value of  such securities  in  foreign
currencies  will change  as a  consequence of market  movements in  the value of
these securities  between  the  dates the  currency  exchange  transactions  are
entered into and the dates they mature.
 
    It  is impossible to  forecast with precision the  market value of portfolio
securities at  the expiration  or maturity  of a  forward or  futures  contract.
Accordingly, it may be necessary for Adjustable Portfolio
 
                                      A-1
<PAGE>
to  purchase  additional  Canadian dollars  on  the  spot market  (and  bear the
expenses of such  purchase) if the  market value of  the security or  securities
being  hedged is less than the amount  of Canadian dollars the Fund is obligated
to deliver and if a decision is made to sell the security or securities and make
delivery of the Canadian dollars. Conversely, it may be necessary to sell on the
spot market some of the Canadian dollars received upon the sale of the portfolio
security or  securities if  the  market value  of  such security  or  securities
exceeds the amount of Canadian dollars the Fund is obligated to deliver.
 
    Hedging  transactions  involve costs  and may  result in  losses. Adjustable
Portfolio may write covered call options  on Canadian dollars to offset some  of
such  costs.  The Fund  may engage  in  over-the-counter transactions  only when
appropriate exchange-traded  transactions  are  unavailable  and  when,  in  the
opinion of the Adviser, the pricing mechanism and liquidity are satisfactory and
the  participants  are  responsible  parties likely  to  meet  their contractual
obligations. Adjustable Portfolio's  ability to  engage in  hedging and  related
option  transactions may be limited by tax considerations. See "Taxation" in the
Statement of Additional Information.
 
    Transaction and  position  hedging  do not  eliminate  fluctuations  in  the
underlying  prices of the securities which  Adjustable Portfolio owns or intends
to purchase or  sell. They simply  establish a  rate of exchange  which one  can
achieve  at some future  point in time.  Additionally, although these techniques
tend to minimize the risk of  loss due to a decline  in the value of the  hedged
currency,  they tend  to limit  any potential gain  which might  result from the
increase in the value of such currency.
 
    A forward  foreign  currency exchange  contract  involves an  obligation  to
purchase  or sell a specific  currency at a future date,  which may be any fixed
number of days  from the date  of the contract  as agreed by  the parties, at  a
price  set at  the time of  the contract. In  the case of  a cancellable forward
contract, the holder has the unilateral right to cancel the contract at maturity
by paying a  specified fee.  The contracts are  traded in  the interbank  market
conducted directly between currency traders (usually large commercial banks) and
their customers. A forward contract generally has no deposit requirement, and no
commissions  are charged  at any  stage for  trades. A  foreign currency futures
contract is  a standardized  contract for  the future  delivery of  a  specified
amount  of a foreign currency at a future date at a price set at the time of the
contract. Foreign currency  futures contracts  traded in the  United States  are
designated by and traded on exchanges regulated by the Commodity Futures Trading
Commission  (the "CFTC"), such  as the New  York Mercantile Exchange. Adjustable
Portfolio would enter into foreign currency futures contracts solely for hedging
or other appropriate risk management purposes as defined in CFTC regulations.
 
    Forward foreign  currency exchange  contracts differ  from foreign  currency
futures  contracts  in certain  respects. For  example, the  maturity date  of a
forward contract may be any fixed number  of days from the date of the  contract
agreed upon by the parties, rather than a predetermined date in any given month.
Also,  forward foreign exchange  contracts are traded  directly between currency
traders so  that  no intermediary  is  required. A  forward  contract  generally
requires no margin or other deposit.
 
    At  the maturity of a forward  or futures contract, Adjustable Portfolio may
either accept or make delivery of the currency specified in the contract, or  at
or  prior to maturity enter into a closing transaction involving the purchase or
sale of an  offsetting contract.  Closing transactions with  respect to  forward
contracts  are effected with the currency trader  who is a party to the original
forward contract. Closing  transactions with  respect to  futures contracts  are
effected  on a commodities exchange; a  clearing corporation associated with the
exchange assumes responsibility for closing out such contracts.
 
                                      A-2
<PAGE>
    Positions in foreign currency futures contracts may be closed out only on an
exchange or board of trade which provides a secondary market for such contracts.
Although Adjustable  Portfolio  intends to  purchase  or sell  foreign  currency
futures contracts only on exchanges or boards of trade where there appears to be
an  active secondary market, there is no assurance that a secondary market on an
exchange or board  of trade will  exist for  any particular contract  or at  any
particular  time.  In such  event, it  may not  be possible  to close  a futures
position and,  in the  event of  adverse price  movements, Adjustable  Portfolio
would continue to be required to make daily cash payments of variation margin.
 
    Options  on foreign currencies  operate similarly to  options on securities,
and are traded  primarily in  the over-the-counter market,  although options  on
foreign  currencies  have recently  been  listed on  several  exchanges. Options
traded in the over-the-counter  market are illiquid and  it may not be  possible
for  Adjustable Portfolio to dispose of an  option it has purchased or terminate
its obligations  under an  option it  has written  at a  time when  the  Adviser
believes  it would be  advantageous to do  so. Options on  futures contracts are
affected by all  of those  factors which  influence foreign  exchange rates  and
investments generally.
 
    The  value of a foreign  currency option is dependent  upon the value of the
foreign currency  and the  U.S. dollar,  and  may have  no relationship  to  the
investment   merits  of  a  foreign  debt  security.  Because  foreign  currency
transactions occurring  in the  interbank  market involve  substantially  larger
amounts  than those that may be involved in the use of foreign currency options,
investors may be disadvantaged by having to deal in an odd lot market (generally
consisting of transactions of less than  $1 million) for the underlying  foreign
currencies at prices that are less favorable than for round lots.
 
    There  is  no  systematic reporting  of  last sale  information  for foreign
currencies and  there is  no regulatory  requirement that  quotations  available
through  dealers or other market  sources be firm or  revised on a timely basis.
Available quotation  information  is  generally  representative  of  very  large
transactions in the interbank market and thus may not reflect relatively smaller
transactions  (less  than $1  million) where  rates may  be less  favorable. The
interbank market in foreign currencies is a global, around-the-clock market.  To
the  extent  the U.S.  options  markets are  closed  while the  markets  for the
underlying currencies remain open, significant price and rate movements may take
place in the underlying markets that cannot be reflected in the options markets.
In addition, significant  price and rate  movements that take  place while  U.S.
markets  are closed will not be reflected in  the price of Fund shares until net
asset value is next determined (as of  the primary closing time of the New  York
Stock Exchange).
 
    Although  foreign  exchange  dealers  do  not  charge  a  fee  for  currency
conversion, they do realize  a profit based upon  the difference (the  "spread")
between  prices at which they are buying and selling various currencies. Thus, a
dealer may offer to sell a foreign currency to Adjustable Portfolio at one rate,
while offering a lesser rate of exchange  should the Fund desire to resell  that
currency to the dealer.
 
                                      A-3
<PAGE>
                         PIPER INSTITUTIONAL FUNDS INC.
 
                               INVESTMENT ADVISER
                     PIPER CAPITAL MANAGEMENT INCORPORATED
 
                                  DISTRIBUTOR
                               PIPER JAFFRAY INC.
 
                          CUSTODIAN AND TRANSFER AGENT
                       INVESTORS FIDUCIARY TRUST COMPANY
 
                              INDEPENDENT AUDITORS
                             KPMG PEAT MARWICK LLP
 
                                 LEGAL COUNSEL
                              DORSEY & WHITNEY LLP
 
Table of Contents
 
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Introduction...................................           2
Fund Expenses..................................           4
Financial Highlights...........................           5
Investment Objectives and Policies.............           7
Special Investment Methods.....................          17
Management.....................................          24
SHAREHOLDER GUIDE TO INVESTING
  How to Purchase Shares.......................          26
  Reducing Your Sales Charge...................          27
  Special Purchase Plans.......................          28
  How to Redeem Shares.........................          29
  Shareholder Services.........................          30
  Dividends and Distributions..................          32
Valuation of Shares............................          34
Tax Status.....................................          35
Performance Comparisons........................          35
General Information............................          36
Appendix A -- Foreign Currency Transactions....         A-1
</TABLE>
 
                        INSTITUTIONAL MONEY MARKET FUND
 
                 INSTITUTIONAL GOVERNMENT ADJUSTABLE PORTFOLIO
 
                              NOVEMBER 1, 1995, AS
                           SUPPLEMENTED JUNE 24, 1996
 
PIF-05


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