PIPER INSTITUTIONAL FUNDS INC
497, 1996-06-19
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<PAGE>
                PROSPECTUS DATED NOVEMBER 1, 1995, AS SUPPLEMENTED JUNE 20, 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.
 
    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  Corporation,  the  Financing
Corporation  and  the  Student   Loan  Marketing  Association.  Obligations   of
 
                                       7
<PAGE>
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
 
    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.
 
    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'
 
                                       8
<PAGE>
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 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
 
                                       9
<PAGE>
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.
 
    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
 
                                       10
<PAGE>
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  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.
 
                                       11
<PAGE>
    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.
 
    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.
 
                                       12
<PAGE>
    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.
 
    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.
 
                                       13
<PAGE>
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 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).
 
                                       14
<PAGE>
    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 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
 
                                       15
<PAGE>
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  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
 
                                       16
<PAGE>
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, 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.
 
                                       17
<PAGE>
    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.
 
    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
 
                                       18
<PAGE>
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 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
 
                                       19
<PAGE>
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 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
 
                                       20
<PAGE>
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  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
 
                                       21
<PAGE>
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 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,
 
                                       22
<PAGE>
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 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.
 
                                       23
<PAGE>
    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.
 
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.
 
                                       24
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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.
 
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.
 
                                       25
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                         SHAREHOLDER GUIDE TO INVESTING
 
                           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 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
 
                                       26
<PAGE>
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                         SHAREHOLDER GUIDE TO INVESTING
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.
 
    - 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.
 
                                       27
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                         SHAREHOLDER GUIDE TO INVESTING
 
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.
 
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
 
                                       28
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                         SHAREHOLDER GUIDE TO INVESTING
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.
 
    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.
 
                                       29
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                         SHAREHOLDER GUIDE TO INVESTING
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 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
 
                                       30
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                         SHAREHOLDER GUIDE TO INVESTING
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 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.
 
                                       31
<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.
 
                                       32
<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
 
                                       33
<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.
 
                                       34
<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
 
                                       35
<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.
 
                                       36
<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.....................          16
Management.....................................          23
SHAREHOLDER GUIDE TO INVESTING
  How to Purchase Shares.......................          25
  Reducing Your Sales Charge...................          26
  Special Purchase Plans.......................          27
  How to Redeem Shares.........................          28
  Shareholder Services.........................          29
  Dividends and Distributions..................          31
Valuation of Shares............................          32
Tax Status.....................................          33
Performance Comparisons........................          33
General Information............................          34
Appendix A -- Foreign Currency Transactions....         A-1
</TABLE>
 
                        INSTITUTIONAL MONEY MARKET FUND
 
                 INSTITUTIONAL GOVERNMENT ADJUSTABLE PORTFOLIO
 
                              NOVEMBER 1, 1995, AS
                           SUPPLEMENTED JUNE 20, 1996
 
PIF-05


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