SHORT TERM INVESTMENTS TRUST
497, 1997-12-19
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<PAGE>   1
SHORT-TERM
INVESTMENTS TRUST
 
                         Prospectus
- --------------------------------------------------------------------------------
 
TREASURY                      The Treasury Portfolio is a money market fund
PORTFOLIO                whose investment objective is the maximization of
                         current income to the extent consistent with the
CASH                     preservation of capital and the maintenance of
MANAGEMENT               liquidity. The Treasury Portfolio seeks to achieve its
CLASS                    objective by investing in direct obligations of the
                         U.S. Treasury and repurchase agreements secured by such
                         obligations. The instruments purchased by the Treasury
                         Portfolio will have maturities of 397 days or less.
                              The Treasury Portfolio is a series portfolio of
                         Short-Term Investments Trust (the "Trust"), an open-
                         end, diversified, series management investment company.
DECEMBER 17, 1997             This Prospectus relates solely to the Cash Manage-
                         designed to be a convenient vehicle in which
                         institutional customers of banks, certain
                         broker-dealers and other financial institutions can
                         invest in a diversified money market fund.
 
                              THESE SECURITIES HAVE NOT BEEN APPROVED OR
                         DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION
                         NOR HAS THE SECURITIES AND EXCHANGE COMMISSION PASSED
                         UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
                         REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                              THIS PROSPECTUS SETS FORTH BASIC INFORMATION THAT
                         A PROSPECTIVE INVESTOR SHOULD KNOW BEFORE INVESTING IN
                         SHARES OF THE CASH MANAGEMENT CLASS OF THE TREASURY
                         PORTFOLIO AND SHOULD BE READ AND RETAINED FOR FUTURE
                         REFERENCE. A STATEMENT OF ADDITIONAL INFORMATION, DATED
                         DECEMBER 17, 1997, HAS BEEN FILED WITH THE UNITED
                         STATES SECURITIES AND EXCHANGE COMMISSION (THE "SEC")
                         AND IS HEREBY INCORPORATED BY REFERENCE. FOR A COPY OF
                         THE STATEMENT OF ADDITIONAL INFORMATION WITHOUT CHARGE,
                         WRITE TO THE ADDRESS BELOW OR CALL (800) 877-7745. THE
                         SEC MAINTAINS A WEB SITE AT HTTP://WWW.SEC.GOV THAT
                         CONTAINS THE STATEMENT OF ADDITIONAL INFORMATION,
                         MATERIAL INCORPORATED BY REFERENCE, AND OTHER
                         INFORMATION REGARDING THE TRUST.
 
                              THE TRUST'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS
                         OF, OR GUARANTEED OR ENDORSED BY, ANY BANK, AND THE
                         TRUST'S SHARES ARE NOT FEDERALLY INSURED OR GUARANTEED
                         BY THE U.S. GOVERNMENT, THE FEDERAL DEPOSIT INSURANCE
                         CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER
                         AGENCY. THERE CAN BE NO ASSURANCE THAT THE TREASURY
                         PORTFOLIO WILL BE ABLE TO MAINTAIN A STABLE NET ASSET
                         VALUE OF $1.00 PER SHARE. SHARES OF THE TRUST INVOLVE
                         INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF
                         PRINCIPAL.
 

 
[LOGO APPEARS HERE]
                  
Fund Management Company
 
11 Greenway Plaza
Suite 100
Houston, Texas 77046-1173
(800) 877-7745
<PAGE>   2
 
                                    SUMMARY
 
THE PORTFOLIO AND ITS INVESTMENT OBJECTIVE
 
  The Trust is an open-end diversified series management investment company.
This Prospectus relates to the Cash Management Class (the "Class") of the
Treasury Portfolio (the "Portfolio"). The Portfolio is a money market fund which
invests in direct obligations of the U.S. Treasury and repurchase agreements
secured by such obligations. The instruments purchased by the Portfolio will
have maturities of 397 days or less. The investment objective of the Portfolio
is the maximization of current income to the extent consistent with the
preservation of capital and the maintenance of liquidity.
 
  Pursuant to separate prospectuses, the Trust also offers shares of other
classes of shares of beneficial interest of the Portfolio: the Institutional
Class, Private Investment Class, Personal Investment Class and Resource Class,
representing an interest in the Portfolio. Such classes have different
distribution arrangements and are designed for institutional and other
categories of investors. The Trust also offers shares of two classes of another
portfolio, the Treasury TaxAdvantage Portfolio, each pursuant to separate
prospectuses. Such classes have different distribution arrangements and are
designed for institutional and other categories of investors. The portfolios of
the Trust are referred to collectively as the "Portfolios."
 
  Because the Trust declares dividends on a daily basis, shares of each class of
the Portfolio have the same net asset value (proportionate interest in the net
assets of the Portfolio) and bear equally those expenses, such as the advisory
fee, that are allocated to the Portfolio as a whole. All classes of the
Portfolio share a common investment objective and portfolio of investments.
However, different classes of the Portfolio have different shareholder
qualifications and are separately allocated certain class expenses, such as
those associated with the distribution of their shares. Therefore, each class
will have a different dividend payment and a different yield.
 
INVESTORS IN THE CLASS
 
  The Class is designed to be a convenient vehicle in which institutional
customers of banks, certain broker-dealers and other financial institutions can
invest in a diversified open-end money market fund.
 
PURCHASE OF SHARES
 
  Shares of the Class that are offered hereby are sold at net asset value. The
minimum initial investment in the Class is $1,000,000. There is no minimum
amount for subsequent investments. Payment for shares of the Class purchased
must be in funds immediately available to the Portfolio. See "Purchase of
Shares."
 
REDEMPTION OF SHARES
 
  Redemptions may be made without charge at net asset value. Payment for
redeemed shares of the Class for which redemption orders are received prior to
4:00 p.m. Eastern Time will normally be made on the same day. See "Redemption of
Shares."
 
DIVIDENDS
 
  The net income of the Portfolio is declared as a dividend daily to
shareholders of record immediately after 4:00 p.m. Eastern Time. Dividends are
paid monthly by check or wire transfer unless the shareholder has previously
elected to have such dividends automatically reinvested in additional shares of
the Class. Information concerning the amount of the dividends declared on any
particular day will normally be available by 5:00 p.m. Eastern Time on that day.
See "Dividends."
 
NET ASSET VALUE
 
  The Trust uses the amortized cost method of valuing the securities of the
Portfolio and rounds the per share net asset value to the nearest whole cent.
Accordingly, the net asset value per share of the Portfolio will normally remain
constant at $1.00. AN INVESTMENT IN THE PORTFOLIO IS NOT INSURED OR GUARANTEED
BY THE U.S. GOVERNMENT, AND THERE IS NO ASSURANCE THAT THE PORTFOLIO WILL BE
ABLE TO MAINTAIN A STABLE NET ASSET VALUE. See "Net Asset Value."
 
INVESTMENT ADVISOR
 
  A I M Advisors, Inc. ("AIM") serves as the Portfolio's investment advisor and
receives a fee based on the Portfolio's average daily net assets. During the
fiscal year ended August 31, 1997, the Trust paid AIM advisory fees with respect
to the Portfolio which represented 0.06% of the average daily net assets of the
Portfolio. AIM is primarily engaged in the business of acting as manager or
advisor to investment companies. Under a separate Administrative Services
Agreement, AIM may be reimbursed by the Trust for its costs of performing
certain accounting and other administrative services for the Fund. See
"Management of the Trust -- Investment Advisor" and "-- Administrative
Services." Under a Transfer Agency and Service Agreement, A I M Insti-
 
                                        2
<PAGE>   3
 
tutional Fund Services, Inc. ("Transfer Agent"), AIM's wholly owned subsidiary
and a registered transfer agent, receives a fee for its provision of transfer
agency, dividend distribution and disbursement, and shareholder services to the
Trust. It is currently anticipated that, effective on or about December 29,
1997, A I M Fund Services, Inc., a wholly owned subsidiary of AIM and a
registered transfer agent, will become the transfer agent to the Trust. See
"General Information -- Transfer Agent and Custodian."
 
DISTRIBUTOR AND DISTRIBUTION PLAN
 
  Fund Management Company ("FMC") acts as the exclusive distributor of the
shares of the Class. Pursuant to a plan of distribution adopted by the Trust's
Board of Trustees, FMC receives a fee from the Trust of up to 0.10% of the
average daily net assets of the Portfolio attributable to the shares of the
Class as compensation for distribution-related services pursuant to plans of
distribution adopted by the Trust's Board of Trustees. The Trust may also make
payments pursuant to such distribution plans to certain broker-dealers or other
financial institutions for distribution-related services. See "Purchase of
Shares" and "Distribution Plan."
 
SPECIAL RISK CONSIDERATIONS
 
  The Portfolio may borrow money and enter into reverse repurchase agreements.
The Portfolio may invest in repurchase agreements and purchase securities for
delayed delivery. Accordingly, an investment in the Portfolio may entail
somewhat different risks from an investment in an investment company that does
not engage in such practices. There can be no assurance that the Portfolio will
be able to maintain a stable net asset value of $1.00 per share. See "Investment
Program."
 
  The AIM Family of Funds, The AIM Family of Funds and Design (i.e., the AIM
Logo), AIM and Design, AIM, AIM LINK, AIM Institutional Funds, La Familia AIM de
Fondos and La Familia AIM de Fondos and Design are registered service marks and
aimfunds.com and Invest With Discipline are service marks of A I M Management
Group Inc.
 
                                        3
<PAGE>   4
 
                           TABLE OF FEES AND EXPENSES
<TABLE>
<S>                                                           <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES*
  Maximum sales load imposed on purchases
     (as a percentage of offering price)....................                  None
  Maximum sales load on reinvested dividends
     (as a percentage of offering price)....................                  None
  Deferred sales load (as a percentage of original purchase
     price or redemption
     proceeds, as applicable)...............................                  None
  Redemption fees (as a percentage of amount
     redeemed, if applicable)...............................                  None
  Exchange fee..............................................                  None
 
ANNUAL PORTFOLIO OPERATING EXPENSES -- CASH MANAGEMENT CLASS
  (AS A PERCENTAGE OF AVERAGE NET ASSETS)
  Management fees...........................................                  0.06%
  12b-1 fees (after fee waivers)**..........................                  0.08%
  Other expenses:
     Custodian fees.........................................      0.01%
     Other..................................................      0.02%
                                                                ------
          Total other expenses..............................                  0.03%
                                                                            ------
  Total portfolio operating expenses -- Cash Management
     Class**................................................                  0.17%
                                                                            ======
</TABLE>
- ---------------
 * Beneficial owners of shares of the Class should consider the effect of any
   charges imposed by their bank, broker-dealer or other financial institution
   for various services.
** If there were no fee waivers, 12b-1 fees and Total portfolio operating
   expenses would have been 0.10% and 0.19%, respectively.
 
EXAMPLE
 
  An investor in the Class would pay the following expenses on a $1,000
investment, assuming (1) a 5% annual return and (2) redemption at the end of
each time period.
 
<TABLE>
<S>                                                           <C>
 1 year.....................................................    $ 2
 3 years....................................................    $ 5
 5 years....................................................    $10
10 years....................................................    $22
</TABLE>
 
  The Table of Fees and Expenses is designed to assist an investor in
understanding the various costs and expenses that an investor in the Class will
bear directly or indirectly. (For more complete descriptions of the various
costs and expenses, see "Management of the Trust" below.) The expense figures
are based upon actual costs and fees charged to the Class for the fiscal year
ended August 31, 1997. The Table of Fees and Expenses reflects a voluntary
waiver of 12b-1 fees for the Class. Future waivers of fees (if any) may vary
from the figures reflected in the Table of Fees and Expenses. To the extent any
service providers assume expenses of the Class, such assumption of expenses will
have the effect of lowering the Class's overall expense ratio and increasing its
yield to investors. Beneficial owners of shares of the Class should also
consider the effect of any charges imposed by the institution maintaining their
accounts.
 
  The example in the Table of Fees and Expenses assumes that all dividends and
distributions are reinvested and that the amounts listed under "Annual Portfolio
Operating Expenses -- Cash Management Class" remain the same in the years shown.
 
  The example shown in the above table is based on the amounts listed under
"Annual Portfolio Operating Expenses." THE EXAMPLE SHOULD NOT BE CONSIDERED TO
BE AN ACCURATE REPRESENTATION OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESSER THAN THOSE SHOWN.
 
                                        4
<PAGE>   5
 
                              FINANCIAL HIGHLIGHTS
 
  Shown below are the per share data, ratios and supplemental data
(collectively, "data") for the four-year period ended August 31, 1997 and the
period August 17, 1993 (date operations commenced) through August 31, 1993. The
data has been audited by KPMG Peat Marwick LLP, independent auditors, whose
unqualified report on the financial statements and the related notes appears 
in the Statement of Additional Information.
 
<TABLE>
<CAPTION>
                                      1997           1996           1995           1994           1993
                                    --------       --------       --------       --------       --------
<S>                                 <C>            <C>            <C>            <C>            <C>
Net asset value, beginning of
  period..........................  $  1.00        $  1.00         $ 1.00         $ 1.00         $ 1.00
Income from investment operations:
  Net investment income...........     0.05           0.05           0.05           0.03          0.001
                                    -------        -------         ------         ------         ------
Less distributions:
  Dividends from net investment
    income........................    (0.05)         (0.05)         (0.05)         (0.03)        (0.001)
                                    -------        -------         ------         ------         ------
Net asset value, end of period....  $  1.00        $  1.00         $ 1.00         $ 1.00         $ 1.00
                                    -------        -------         ------         ------         ------
Total return......................     5.39%          5.48%          5.57%          3.44%          2.91%(a)
                                    =======        =======         ======         ======         ======
Ratios/supplemental data:
  Net assets, end of period (000s
    omitted)......................  $829,243       $789,627        $81,219        $73,619        $8,681
                                    =======        =======         ======         ======         ======
  Ratio of expenses to average net
    assets(b).....................     0.17%(c)       0.17%          0.18%          0.16%          0.16%(a)
                                    =======        =======         ======         ======         ======
  Ratio of net investment income
    to average net assets(d)......     5.25%(c)       5.25%          5.42%          3.48%          3.00%(a)
                                    =======        =======         ======         ======         ======
</TABLE>
 
- ---------------
 
(a) Annualized.
 
(b) After fee waivers and/or expense reimbursements. Ratios of expenses to
    average net assets prior to fee waivers and/or expense reimbursements were
    0.19%, 0.19%, 0.20%, 0.21% and 0.18% (annualized) for the periods 1997-1993,
    respectively .
 
(c) Ratios are based on average net assets of $781,320,880.
 
(d) After fee waivers and/or expense reimbursements. Ratios of net investment
    income to average net assets prior to fee waivers and/or expense
    reimbursements were 5.24%, 5.23%, 5.40%, 3.43% and 2.98% (annualized) for
    the periods 1997-1993, respectively.
 
                           SUITABILITY FOR INVESTORS
 
  The shares of the Class are intended for use primarily by institutional
customers of banks, certain broker-dealers and other financial institutions who
seek a convenient vehicle in which to invest in an open-end diversified money
market fund. It is expected that the shares of the Class may be particularly
suitable investments for corporate cash managers, municipalities or other public
entities. The minimum initial investment is $1,000,000.
 
  Investors in the shares of the Class have the opportunity to receive a
somewhat higher yield than might be obtainable through direct investment in
money market instruments, and enjoy the benefits of diversification, economies
of scale and same-day liquidity. Generally, higher interest rates can be
obtained on the purchase of very large blocks of money market instruments. Of
course, any such relative increase in interest rates may be offset to some
extent by the operating expenses of the shares of the Class.
 
                               INVESTMENT PROGRAM
 
INVESTMENT OBJECTIVE
 
  The investment objective of the Portfolio is the maximization of current
income to the extent consistent with the preservation of capital and the
maintenance of liquidity. The Portfolio seeks to achieve its objective by
investing in direct obligations of the U.S. Treasury and repurchase agreements
secured by such obligations. The money market instruments in which the Portfolio
invests are considered to carry very little risk and accordingly may not have as
high a yield as that available on money market instruments of lesser quality.
The Portfolio consists exclusively of money market instruments which have
maturities of 397 days or less from the date of purchase (except that securities
subject to repurchase agreements may have longer maturities).
 
INVESTMENT POLICIES
 
  The Portfolio invests exclusively in direct obligations of the U.S. Treasury,
which include Treasury bills, notes and bonds, and repurchase agreements
relating to such securities. The Portfolio may also engage in the investment
practices described below.
 
                                        5
<PAGE>   6
 
The market values of the money market instruments held by the Portfolio will be
affected by changes in the yields available on similar securities. If yields
have increased since a security was purchased, the market value of such security
will generally have decreased. Conversely, if yields have decreased, the market
value of such security will generally have increased.
 
  REPURCHASE AGREEMENTS. The Portfolio intends to invest in repurchase
agreements with banks and broker-dealers pertaining to the securities described
above and which at the date of purchase are "First Tier" securities as defined
in Rule 2a-7 under the 1940 Act, as such Rule may be amended from time to time.
Generally, "First Tier" securities are securities that are rated in the highest
rating category by two nationally recognized statistical rating organizations
("NRSROs") or, if only rated by one NRSRO, are rated in the highest rating
category by that NRSRO or, if unrated, are determined by AIM (under the
supervision of and pursuant to guidelines established by the Trust's Board of
Trustees) to be of comparable quality to a rated security that meets the
foregoing quality standards. A repurchase agreement is an instrument under which
the Portfolio acquires ownership of a debt security and the seller agrees, at
the time of the sale, to repurchase the obligation at a mutually agreed-upon
time and price, thereby determining the yield during the Portfolio's holding
period. Repurchase transactions are limited to a term not to exceed 365 days.
The Portfolio may enter into repurchase agreements only with institutions
believed by the Trust's Board of Trustees to present minimal credit risk. With
regard to repurchase transactions, in the event of a bankruptcy or other default
of a seller of a repurchase agreement (such as the seller's failure to
repurchase the obligation in accordance with the terms of the agreement), the
Portfolio could experience both delays in liquidating the underlying securities
and losses, including: (a) a possible decline in the value of the underlying
security during the period while the Portfolio seeks to enforce its rights
thereto, (b) possible subnormal levels of income and lack of access to income
during this period, and (c) expenses of enforcing its rights. Repurchase
agreements are considered to be loans under the 1940 Act.
 
  BORROWING MONEY/REVERSE REPURCHASE AGREEMENTS. The Portfolio may borrow money
and enter into reverse repurchase agreements with respect to its portfolio
securities in amounts up to 10% of the value of its total assets at the time of
borrowing or entering into a reverse repurchase agreement. Reverse repurchase
agreements involve the sale by the Portfolio of a portfolio security at an
agreed-upon price, date and interest payment. The Portfolio will borrow money or
enter into reverse repurchase agreements solely for temporary or defensive
purposes, such as to facilitate the orderly sale of portfolio securities or to
accommodate abnormally heavy redemption requests should they occur. Reverse
repurchase transactions are limited to a term not to exceed 92 days. The
Portfolio will use reverse repurchase agreements when the interest income to be
earned from the securities that would otherwise have to be liquidated to meet
redemption requests is greater than the interest expense of the reverse
repurchase transaction. Reverse repurchase agreements involve the risk that the
market value of securities retained by the Portfolio in lieu of liquidation may
decline below the repurchase price of the securities sold by the Portfolio which
it is obligated to repurchase. The risk, if encountered, could cause a reduction
in the net asset value of the Portfolio's shares. Reverse repurchase agreements
are considered to be borrowings by the Portfolio under the 1940 Act.
 
  LENDING OF PORTFOLIO SECURITIES. The Portfolio may also lend its portfolio
securities in amounts up to 33-1/3% of its total assets to financial
institutions in accordance with the investment restrictions of the Portfolio.
Such loans would involve risks of delay in receiving additional collateral in
the event the value of the collateral decreased below the value of the
securities loaned or of delay in recovering the securities loaned or even loss
of rights in the collateral should the borrower of the securities fail
financially. However, loans will be made only to borrowers deemed by AIM to be
of good standing and only when, in AIM's judgment, the income to be earned from
the loans justifies the attendant risks.
 
  PURCHASING DELAYED DELIVERY SECURITIES. In managing the Portfolio's
investments, AIM may indicate to dealers or issuers its interest in acquiring
certain securities for the Portfolio for settlement beyond a customary
settlement date. In some cases, the Portfolio may agree to purchase such
securities at stated prices and yields. In such cases, such securities are
considered "delayed delivery" securities when traded in the secondary market.
Since this is done to facilitate the acquisition of portfolio securities and is
not for the purpose of investment leverage, the amount of delayed delivery
securities involved may not exceed the estimated amount of funds available for
investment on the settlement date. Until the settlement date, liquid assets of
the Portfolio with a dollar value sufficient at all times to make payment for
the delayed delivery securities will be segregated. The total amount of
segregated liquid assets may not exceed 25% of the Portfolio's total assets. The
delayed delivery securities, which will not begin to accrue interest until the
settlement date, will be recorded as an asset of the Portfolio and will be
subject to the risks of market value fluctuations. The purchase price of the
delayed delivery securities will be recorded as a liability of the Portfolio
until settlement. Absent extraordinary circumstances, the Portfolio's right to
acquire delayed delivery securities will not be divested prior to the settlement
date.
 
  ILLIQUID SECURITIES. The Portfolio will invest no more than 10% of its net
assets in illiquid securities.
 
  PORTFOLIO TRANSACTIONS. The Portfolio does not seek profits through short-term
trading and will generally hold portfolio securities to maturity, but AIM may
seek to enhance the yield of the Portfolio by taking advantage of yield
disparities or other factors that occur in the money markets. For example,
market conditions frequently result in similar securities trading at different
prices. AIM may dispose of any portfolio security prior to its maturity if such
disposition and reinvestment of proceeds are
 
                                        6
<PAGE>   7
expected to enhance yield consistent with AIM's judgment as to desirable
portfolio maturity structure or if such disposition is believed to be advisable
due to other circumstances or conditions. Securities held by the Portfolio will
be disposed of prior to maturity if an earlier disposition is deemed desirable
by AIM to meet redemption requests. In addition, AIM will continually monitor
the creditworthiness of issuers whose securities are held by the Portfolio, and
securities held by the Portfolio may be disposed of prior to maturity as a
result of a revised credit evaluation of the issuer or other circumstances or
considerations. The Portfolio's policy of investing in securities with
maturities of 397 days or less will result in high portfolio turnover. Since
brokerage commissions are not normally paid on investments of the type made by
the Portfolio, the high turnover rate should not adversely affect the
Portfolio's net income.
 
  INVESTMENT IN OTHER INVESTMENT COMPANIES. The Trust is permitted to invest in
other investment companies to the extent permitted by the 1940 Act, and rules 
and regulations thereunder, and, if applicable, exemptive orders granted by the
SEC. 

  The investment policies described above may be changed by the Board of 
Trustees without the affirmative vote of a majority of the outstanding shares of
beneficial interest of the Trust.

INVESTMENT RESTRICTIONS
 
  The Portfolio's investment program is subject to a number of investment
restrictions which reflect self-imposed standards as well as federal and state
regulatory limitations. These restrictions are designed to minimize certain
risks associated with investing in specified types of securities or engaging in
certain transactions and to limit the amount of the Portfolio's assets which may
be concentrated in any specific industry or issuer. The most significant of
these restrictions provide that the Portfolio will not:
 
          (1) purchase securities of any one issuer (other than obligations of
     the U.S. Government, its agencies or instrumentalities) if, immediately
     after such purchase, more than 5% of the value of the Portfolio's total
     assets would be invested in such issuer, except as permitted by Rule 2a-7
     under the 1940 Act, as such rule may be amended from time to time, and
     except that the Portfolio may purchase securities of other investment
     companies to the extent permitted by applicable law or exemptive order.
 
          (2) borrow money or issue senior securities except (a) for temporary
     or emergency purposes (e.g., in order to facilitate the orderly sale of
     portfolio securities or to accommodate abnormally heavy redemption
     requests), the Portfolio may borrow money from banks or obtain funds by
     entering into reverse repurchase agreements, and (b) to the extent that
     entering into commitments to purchase securities in accordance with the
     Portfolio's investment program may be considered the issuance of senior
     securities. The Portfolio will not purchase securities while borrowings in
     excess of 5% of its total assets are outstanding.
 
  The foregoing investment restrictions of the Portfolio (as well as certain
others set forth in the Statement of Additional Information) are matters of
fundamental policy which may not be changed without the affirmative vote of a
majority of the outstanding shares of the Portfolio.
 
 
  In addition to the restrictions described above, the Portfolio must also
comply with the requirements of Rule 2a-7 under the 1940 Act, as such Rule may
be amended from time to time, which govern the operations of money market funds,
and may be more restrictive than the policies described herein. A description of
further investment restrictions applicable to the Portfolio is contained in the
Statement of Additional Information.
 
                               PURCHASE OF SHARES
 
  Shares of the Class are sold on a continuing basis at their net asset value
next determined after an order has been received by the Portfolio. As discussed
below, the Trust reserves the right to reject any purchase order. Although there
is no sales charge imposed on the purchase of shares of the Class, banks or
other institutions may charge a recordkeeping, account maintenance or other fee
to their customers, and beneficial holders of the shares of the Class should
consult with the institutions maintaining their accounts to obtain a schedule of
applicable fees. To facilitate the investment of proceeds of purchase orders,
the investors are urged to place their orders as early in the day as possible.
Purchase orders will be accepted for execution on the day the order is placed,
provided that the order is properly submitted and received by the Transfer Agent
prior to 4:00 p.m. Eastern Time on a business day of the Portfolio. Purchase
orders received after such time will be processed at the next day's net asset
value. Following the initial investment, subsequent purchases of shares of the
Class may also be made via AIM LINK--Registered Trademark-- Remote, a 
 
                                        7
<PAGE>   8
personal computer application software product. Shares of the Class will earn
the dividend declared on the effective date of purchase. 

  A "business day of the Portfolio" is any day on which both the Federal Reserve
Bank of New York and The Bank of New York, the Trust's custodian bank, are open
for business. The Portfolio, however, reserves the right to change the time for
which purchase and redemption requests must be submitted to the Portfolio for
execution on the same day or any day when the U.S. primary broker-dealer
community is closed for business or trading is restricted due to national
holidays. It is expected that The Bank of New York and the Federal Reserve Bank
of New York will be closed during the next twelve months on Saturdays and
Sundays, and on the observed holidays of New Year's Day, Martin Luther King
Jr.'s Birthday, Presidents' Day, Memorial Day, Independence Day, Labor Day,
Columbus Day, Veterans' Day, Thanksgiving Day and Christmas Day.
 
  Shares of the Class are sold to institutional customers of banks, certain
broker-dealers and other financial institutions (individually, an "Institution"
and collectively, "Institutions"). Individuals, corporations, partnerships and
other businesses that maintain qualified accounts at an Institution may invest
in the shares of the Class. Each Institution will render administrative support
services to its customers who are the beneficial owners of the shares of the
Class. Such services may include, among other things, establishment and
maintenance of shareholder accounts and records; assistance in processing
purchase and redemption transactions in shares of the Class; providing periodic
statements showing a customer's account balance in shares of the Class;
distribution of Trust proxy statements, annual reports and other communications
to shareholders whose accounts are serviced by the Institution; and such other
services as the Trust may reasonably request. Institutions will be required to
certify to the Trust that they comply with applicable state laws regarding
registration as broker-dealers, or that they are exempt from such registration.
 
  Prior to the initial purchase of shares of the Class, an Account Application,
which can be obtained from the Transfer Agent, must be completed and sent to the
Transfer Agent at 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173. Any
changes made to the information provided in the Account Information and
Authorization Form must be made in writing or by completing a new form and
providing it to the Transfer Agent. An investor must open an account in the
shares of the Class through an Institution in accordance with procedures
established by such Institution. Each Institution separately determines the
rules applicable to accounts in the shares of the Class opened with it,
including minimum initial and subsequent investment requirements and the
procedures to be followed by investors to effect purchases of shares of the
Class. The minimum initial investment is $1,000,000, and there is no minimum
amount of subsequent purchases of shares of the Class by an Institution on
behalf of its customers. An investor who proposes to open a Portfolio account
with an Institution should consult with a representative of such Institution to
obtain a description of the rules governing such an account. The Institution
holds shares of the Class registered in its name, as agent for the customer, on
the books of the Institution. A statement with regard to the customer's shares
of the Class is supplied to the customer periodically, and confirmations of all
transactions for the account of the customer are provided by the Institution to
the customer promptly upon request. In addition, the Institution sends to each
customer proxies, periodic reports and other information with regard to the
customer's shares of the Class. The customer's shares of the Class are fully
assignable and subject to encumbrance by the customer.
 
  All agreements which relate to a customer's account with an Institution are
with the Institution. An investor may terminate his relationship with an
Institution at any time, in which case an account in the investor's name will be
established directly with the Portfolio and the investor will become a
shareholder of record. In such case, however, the investor will not be able to
purchase additional shares of the Class directly, except through reinvestment of
dividends and distributions.
 
  Orders for the purchase of shares of the Class are placed by the investor with
the Institution. The Institution is responsible for the prompt transmission of
the order to the Trust. The Portfolio will normally be required to make
immediate settlement in federal funds (member bank deposits with a Federal
Reserve Bank) for portfolio securities purchased. Accordingly, payment for
shares of the Class purchased by Institutions on behalf of their customers must
be in federal funds. If an investor's order to purchase shares of the Class is
paid for other than in federal funds, the Institution, acting on behalf of the
investor, completes the conversion into federal funds (which may take two
business days), or itself advances federal funds prior to conversion, and
promptly transmits the order and payment in the form of federal funds to the
Transfer Agent.
 
  Subject to the conditions stated above and to the Trust's right to reject any
purchase order, orders will be accepted (i) when payment for shares of the Class
purchased is received by The Bank of New York, the Trust's custodian bank, in
the form described above and notice of such order is provided to the Transfer
Agent or (ii) at the time the order is placed, if the Portfolio is assured of
payment. Shares of the Class purchased by orders which are accepted prior to
3:00 p.m. Eastern Time will earn the dividend declared on the date of purchase.
 
  Federal Reserve wires should be sent as early as possible in order to
facilitate crediting to the shareholder's account. Any funds received with
respect to an order which is not accepted by the Trust and any funds received
for which an order has not been received will be returned to the sending
Institution. An order must specify that it is for the purchase of shares of the
"Cash Management Class of the Treasury Portfolio," otherwise any funds received
will be returned to the sending Institution.
 
 
                                        8
<PAGE>   9
  The Trust reserves the right in its sole discretion to withdraw all or any
part of the offering made by this Prospectus or to reject any purchase order.
 
                              REDEMPTION OF SHARES
 
  A shareholder may redeem any or all of its shares of the Class at the net
asset value next determined after receipt of the redemption request in proper
form by the Trust. Redemption requests with respect to the Class may also be
made via AIM LINK--Registered Trademark--Remote. Normally, the net asset value 
per share of the Portfolio will remain constant at $1.00. See "Net Asset 
Value." Redemption requests with respect to shares of the Class are normally 
made through a customer's Institution.
 
  Payment for redeemed shares of the Class is normally made by Federal Reserve
wire to the commercial bank account designated in the Institution's Account
Application, but may be remitted by check upon request by a shareholder. If a
redemption request is received by the Transfer Agent prior to 4:00 p.m. Eastern
Time on a business day of the Portfolio, the redemption will be effected at the
net asset value next determined on such day and the shares of the Class to be
redeemed will not receive the dividend declared on the effective date of the
redemption. If a redemption request is received by the Transfer Agent after 4:00
p.m. Eastern Time or on other than a business day of the Portfolio, the
redemption will be effected at the net asset value of the Portfolio determined
as of 4:00 p.m. Eastern Time on the next business day of the Portfolio, and the
proceeds of such redemption will normally be wired on the effective day of the
redemption. The Portfolio reserves the right to change the time for which
redemption requests must be submitted to and received by the Transfer Agent for
execution on the same day on any day when the U.S. primary broker-dealer
community is closed for business or trading is restricted due to national
holiday.
 
  A shareholder may change the bank account designated to receive redemption
proceeds by written notice to the Trust. The authorized signature on the notice
must be guaranteed by a commercial bank or a trust company. Additional
documentation may be required when deemed appropriate by the Trust or the
Transfer Agent.
 
  Shareholders may request a redemption by telephone. Neither the Transfer Agent
nor FMC will be liable for any loss, expense or cost arising out of any
telephone redemption request effected in accordance with the authorization set
forth in the Account Application if they reasonably believe such request to be
genuine but may in certain cases be liable for losses due to unauthorized or
fraudulent transactions if they do not follow reasonable procedures for
verification of telephone transactions. Such reasonable procedures for
verification of telephone transactions may include recordings of telephone
transactions (maintained for six months), and mailings of confirmations promptly
after the transaction.
 
  Payment for shares of the Class redeemed by mail and payment for telephone
redemptions in amounts of less than $1,000 may be made by check mailed within
seven days after receipt of the redemption request in proper form. The Trust may
make payment for telephone redemptions in excess of $1,000 by check when it is
considered to be in the Portfolio's best interest to do so.
 
  The shares of the Class are not redeemable at the option of the Trust unless
the Board of Trustees of the Trust determines in its sole discretion that
failure to so redeem may have materially adverse consequences to the
shareholders of the Trust.
 
                                   DIVIDENDS
 
  Dividends from the net income of the Portfolio are declared daily to
shareholders of record of each class of the Portfolio as of immediately after
4:00 p.m. Eastern Time on the day of declaration. Net income for dividend
purposes is determined daily as of 4:00 p.m. Eastern Time. The dividend accrued
and paid for each class will consist of (a) income of the Portfolio, the
allocation of which is based upon such class' pro rata share of the total
outstanding shares representing an interest in the Portfolio, less (b) Portfolio
expenses, such as custodian fees, trustees' fees, accounting and legal expenses,
based upon such class' pro rata share of the net assets of the Portfolio, less
(c) expenses directly attributable to such class, such as distribution expenses,
if any, and transfer agency fees. Although realized gains and losses on the
assets of the Portfolio are reflected in its net asset value, they are not
expected to be of an amount which would affect its $1.00 per share net asset
value for purposes of purchases and redemptions. See "Net Asset Value."
Distributions from net realized short-term gains may be declared and paid yearly
or more frequently. See "Taxes." The Portfolio does not expect to realize any
long-term capital gains or losses.
 
  All dividends declared during a month will normally be paid by wire transfer.
Payment will normally be made on the first business day of the following month.
A shareholder may elect to have all dividends automatically reinvested in
additional full and fractional Shares at the net asset value as of 4:00 p.m.
Eastern Time on the last business day of the month. Such election, or any
revocation thereof, must be made in writing by the Institution to the Transfer
Agent at 11 Greenway Plaza, Suite 100, Houston, TX 77046-1173 and will become
effective with dividends paid after its receipt by the Transfer Agent. If a
shareholder redeems all the Shares in its account at any time during the month,
all dividends declared through the date of redemption are paid to the
shareholder along with the proceeds of the redemption.
 
 
                                        9
<PAGE>   10
  The Portfolio uses its best efforts to maintain its net asset value per share
at $1.00 for purposes of sales and redemptions. See "Net Asset Value." Should
the Trust incur or anticipate any unusual expense, loss or depreciation which
could adversely affect the income or net asset value of the Portfolio, the
Trust's Board of Trustees would at that time consider whether to adhere to the
present dividend policy described above or to revise it in light of the then
prevailing circumstances. For example, under such unusual circumstances, the
Board of Trustees might reduce or suspend the daily dividend in order to prevent
to the extent possible the net asset value per share of the Portfolio from being
reduced below $1.00. Thus, such expenses, losses or depreciation may result in a
shareholder receiving no dividends for the period during which it held its
Shares and cause such a shareholder to receive upon redemption a price per share
lower than the shareholder's original cost.
 
                                     TAXES
 
  The policy of the Portfolio is to distribute to its shareholders at least 90%
of its investment company taxable income for each year and consistent therewith
to meet the distribution requirements of Part I of Subchapter M of the Internal
Revenue Code of 1986, as amended (the "Code"). The Portfolio also intends to
meet the distribution requirements imposed by the Code in order to avoid the
imposition of a 4% excise tax. The Portfolio intends to distribute at least 98%
of its net investment income for the calendar year and at least 98% of its net
realized capital gains, if any, for the period ending on October 31. The
Portfolio also intends to meet the other requirements of Subchapter M, including
the requirements with respect to diversification of assets and sources of
income, so that the Portfolio will pay no taxes on net investment income and net
realized capital gains paid to shareholders.
 
  Dividends paid by the Portfolio are subject to taxation as of the date of
payment, whether received by shareholders in cash or shares of the Class. The
Code provides an exception to this general rule: if the Portfolio declares a
dividend in October, November or December to shareholders of record in such
months and pays the dividend during January of the next year, a shareholder will
be treated for tax purposes as having received the dividend on December 31 of
the year in which it is declared rather than in January when it is paid. It is
anticipated that no portion of distributions will be eligible for the dividends
received deduction for corporations. Dividends paid by the Portfolio from its
net investment income and short-term capital gains are taxable to shareholders
at ordinary income tax rates.
 
  The Portfolio will be treated as a separate corporation for purposes of
determining taxable income, distribution requirements and other requirements of
Subchapter M. Therefore, the Portfolio may not offset its gains against the
losses of the other portfolio of the Trust and each portfolio of the Trust must
specifically comply with all the provisions of the Code.
 
  Distributions and transactions referred to in the preceding paragraphs may be
subject to state, local or foreign taxes, and the treatment thereof may differ
from the federal income tax consequences discussed herein. Shareholders are
advised to consult with their own tax advisors concerning the application of
state, local or foreign taxes.
 
  Foreign persons who file a United States tax return after December 31, 1996
for a U.S. tax refund and who are not eligible to obtain a social security
number must apply to the Internal Revenue Service ("IRS") for an individual
taxpayer identification number, using IRS Form W-7. For a copy of the IRS Form
W-7 and accompanying instructions, please contact your tax advisor or the
Transfer Agent.
 
                                NET ASSET VALUE
 
  The net asset value per share of the Portfolio is determined daily as of 4:00
p.m. Eastern Time on each business day of the Portfolio. Net asset value per
share is determined by dividing the value of the Portfolio's securities, cash
and other assets (including interest accrued but not collected) less all of its
liabilities (including accrued expenses and dividends payable), by the number of
shares outstanding of the Portfolio and rounding the resulting per share net
asset value to the nearest one cent.
 
  The securities of the Portfolio are valued on the basis of amortized cost
pursuant to rules promulgated by the SEC applicable to money market funds. This
method values a security at its cost on the date of purchase and thereafter
assumes a constant amortization to maturity of any discount or premium,
regardless of the impact of fluctuating interest rates on the market value of
the security. 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 Portfolio would receive if the security were sold.
During such periods, the daily yield on shares of the Portfolio, computed as
described in "Purchases and Redemptions -- Performance Information" in the
Statement of Additional Information, may differ somewhat from an identical
computation made by an investment company with identical investments utilizing
available indications as to market value to value its portfolio securities.
 
                                       10
<PAGE>   11
 
                               YIELD INFORMATION
 
  Yield information for the Class can be obtained by calling the Trust at (800)
877-7745. Yields will fluctuate from time to time and are not necessarily
indicative of future results. Accordingly, the yield information may not provide
a basis for comparison with investments which pay a fixed rate of interest for a
stated period of time. Yield is a function of the type and quality of the
Portfolio's investments, the Portfolio's maturity and the operating expense
ratio of the Class. A SHAREHOLDER'S INVESTMENT IN THE PORTFOLIO IS NOT INSURED
OR GUARANTEED BY THE U.S. GOVERNMENT OR BY ANY INSTITUTION. These factors should
be carefully considered by an investor before making an investment in the
Portfolio.
 
  For the seven-day period ended August 31, 1997, the current yield and the
effective yield of the Class (which assumes the reinvestment of dividends for a
365-day year and a return for the entire year equal to the average annualized
current yield for the period) were 5.49% and 5.64%, respectively. The
performance numbers for any other seven-day period may be substantially
different from those quoted above.
 
  To assist banks and other institutions performing their own subaccounting,
same day information as to the daily dividend per share for the Portfolio to
eight decimal places and current yield normally will be available by 5:00 p.m.
Eastern Time.
 
  From time to time and in its discretion, AIM or its affiliates may waive all
or a portion of its advisory fees and/or assume certain expenses of the
Portfolio. Such a practice will have the effect of increasing the Portfolio's
yield and total return.
 
                            REPORTS TO SHAREHOLDERS
 
  The Trust furnishes shareholders with semi-annual reports containing
information about the Portfolio and its operations, including a list of the
investments held by the Portfolio and financial statements. The annual financial
statements are audited by the Trust's independent auditors.
 
  Unless otherwise requested by the shareholder, each shareholder will be
provided by its Institution with a written confirmation for each transaction.
Institutions establishing sub-accounts will receive a written confirmation for
each transaction in a sub-account. Duplicate confirmations may be transmitted to
the beneficial owner of the sub-account if requested by the Institution. The
Institution will receive a periodic statement setting forth, for each
sub-account, the share balance, income earned for the month, income earned for
the year to date and the total current value of the account.
 
                            MANAGEMENT OF THE TRUST
 
BOARD OF TRUSTEES
 
  The overall management of the business and affairs of the Trust is vested with
its Board of Trustees. The Board of Trustees approves all significant agreements
between the Trust and persons or companies furnishing services to the Trust,
including agreements with the Trust's investment advisor, distributor, custodian
and transfer agent. The day-to-day operations of the Trust are delegated to the
Trust's officers and to AIM, subject always to the objective and policies of the
Trust and to the general supervision of the Trust's Board of Trustees.
Information concerning the Board of Trustees may be found in the Statement of
Additional Information. Certain trustees and officers of the Trust are
affiliated with AIM and A I M Management Group Inc. ("AIM Management"), the
parent corporation of AIM.
 
INVESTMENT ADVISOR
 
  A I M Advisors, Inc., 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173,
acts as the investment advisor for the Portfolio pursuant to a Master Investment
Advisory Agreement dated as of February 28, 1997 (the "Advisory Agreement"). AIM
was organized in 1976 and, together with its affiliates, manages or advises 55
investment company portfolios. Certain of the directors and officers of AIM are
also trustees or executive officers of the Trust. AIM is a wholly owned
subsidiary of AIM Management. AIM Management is a holding company in the
financial services business. AIM Management is an indirect, wholly owned
subsidiary of AMVESCAP PLC, a publicly-traded holding company that, through its
subsidiaries, engages in the business of investment management on an
international basis.
 
  Pursuant to the terms of the Advisory Agreement, AIM manages the investment of
the Portfolio's assets and obtains and evaluates economic, statistical and
financial information to formulate and implement investment policies for the
Portfolio. The Advisory Agreement requires AIM to reduce its fee to the extent
required to satisfy any expense limitations imposed by the securities laws or
regulations thereunder of any state in which the Portfolio's shares are
qualified for sale.
 
                                       11
<PAGE>   12
  For the fiscal year ended August 31, 1997, AIM received fees from the Trust,
with respect to the Portfolio under the Advisory Agreement which represented
0.06% of the Portfolio's average daily net assets. During such fiscal year, the
expenses of the Class, including AIM's fees, amounted to 0.17% of the Class's
average daily net assets.
 
ADMINISTRATIVE SERVICES
 
  The Trust has entered into a Master Administrative Services Agreement dated as
of February 28, 1997 with AIM (the "Administrative Services Agreement"),
pursuant to which AIM has agreed to provide or arrange for the provision of
certain accounting and other administrative services to the Portfolio, including
the services of a principal financial officer of the Trust and related staff. As
compensation to AIM for its services under the Administrative Services
Agreement, the Portfolio may reimburse AIM for expenses incurred by AIM in
connection with such services.

 
FEE WAIVERS
 
  AIM or its affiliates may in its discretion from time to time agree to waive
voluntarily all or any portion of its advisory fee and/or assume certain
expenses of the Portfolio but will retain its ability to be reimbursed for such
fee or expenses prior to the end of each fiscal year. FMC may in its discretion
from time to time agree to waive voluntarily its 12b-1 fee but will retain its
ability to be reimbursed prior to the end of the fiscal year. AIM voluntarily
reimbursed expenses of $24,200 on the Portfolio during the year ended August 31,
1997.
 
DISTRIBUTOR
 
  The Trust has entered into a Master Distribution Agreement dated as of
February 28, 1997 (the "Distribution Agreement") with FMC, a registered
broker-dealer and a wholly-owned subsidiary of AIM, to act as the exclusive
distributor of the shares of the Class. The address of FMC is 11 Greenway Plaza,
Suite 100, Houston, Texas 77046-1173. Certain trustees and officers of the Trust
are affiliated with FMC and AIM. The Distribution Agreement provides that FMC
has the exclusive right to distribute shares of the Trust either directly or 
through other broker-dealers. FMC is the distributor of several of the mutual 
funds managed or advised by AIM.
 
  FMC may, from time to time, at its expense, pay a bonus or other consideration
or incentive to dealers or financial institutions who sell a minimum dollar
amount of the shares of the Class during a specific period of time. In some
instances, these incentives may be offered only to certain dealers or financial
institutions who have sold or may sell significant amounts of shares. The total
amount of such additional bonus payments or other consideration shall not exceed
 .05% of the net asset value of the shares of the Class sold. Any such bonus or
incentive programs will not change the price paid by investors for the purchase
of shares of the Class or the amount received as proceeds from such sales. Sales
of the shares of the Class may not be used to qualify for any incentives to the
extent that such incentives may be prohibited by the laws of any jurisdiction.
 
DISTRIBUTION PLAN
 
  The Trust has adopted a Master Distribution Plan (the "Plan") pursuant to Rule
12b-1 under the 1940 Act. The Plan provides that the Trust may compensate FMC in
connection with the distribution of the shares of the Class an amount equal to
0.10% on an annualized basis of the average daily net assets of the Portfolio
attributable to the Class. Such amount may be expended when and if authorized by
the Board of Trustees and may be used to finance such distribution-related
services as expenses of organizing and conducting sales seminars, printing of
prospectuses and statements of additional information (and supplements thereto)
and reports for other than existing shareholders, preparation and distribution
of advertising material and sales literature and costs of administering the
Plan.
 
  Of the compensation paid to FMC under the Plan, a service fee may be paid to
dealers and other financial institutions that provide continuing personal
shareholder services to their customers who purchase and own shares of the
Class, in amounts of up to 0.10% of the average daily net assets of the
Portfolio attributable to the Class which are attributable to the customers of
such dealers or financial institutions. The Plan also imposes a cap on the total
amount of sales charges, including asset-based sales charges, that may be paid
by the Portfolio with respect to the Class. The Plan does not obligate the Trust
to reimburse FMC for the actual expenses FMC may incur in fulfilling its
obligations under the Plan on behalf of the Class. Thus, under the Plan, even if
FMC's actual expenses exceed the fee payable to FMC thereunder at any given
time, the Trust will not be obligated to pay more than that fee. If FMC's
expenses are less than the fee it receives, FMC will retain the full amount of
the fee.
 
  The Plan requires the officers of the Trust to provide the Board of Trustees
at least quarterly with a written report of the amounts expended pursuant to the
Plan and the purposes for which such expenditures were made. The Board of
Trustees shall review these reports in connection with their decisions with
respect to the Plan.
 
                                       12
<PAGE>   13
 
 
  As required by Rule 12b-1 under the 1940 Act, the Plan was initially approved
by the Board of Trustees, including a majority of the trustees who are not
"interested persons" (as defined in the 1940 Act) of the Trust and who have no
direct or indirect financial interest in the operation of the Plan or in any
agreements related to the Plan ("Qualified Trustees") on July 19, 1993. In
approving the continuance of the Plan in accordance with the requirements of
Rule 12b-1, the trustees considered various factors and determined that there is
a reasonable likelihood that the Plan will benefit the Fund and the holders of
the shares of the Class.
 
  The Plan may be terminated by a vote of a majority of the Qualified Trustees,
or by a vote of a majority of the holders of the outstanding voting securities
of the class to which the Plan relates. Any change in the Plan that would
increase materially the distribution expenses paid by the Class requires
shareholder approval; otherwise the Plan may be amended by the trustees,
including a majority of the Qualified Trustees, by vote cast in person at a
meeting called for the purpose of voting upon such amendment. As long as the
Plan is in effect, the selection or nomination of the Qualified Trustees is
committed to the discretion of the Qualified Trustees.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
 
  AIM is responsible for decisions to buy and sell securities for the Portfolio,
broker-dealer selection and negotiation of commission rates. Since purchases and
sales of portfolio securities by the Portfolio are usually principal
transactions, the Portfolio incurs little or no brokerage commissions. Portfolio
securities are normally purchased directly from the issuer or from a market
maker for the securities. The purchase price paid to dealers serving as market
makers may include a spread between the bid and asked prices. The Portfolio may
also purchase securities from underwriters at prices which include a concession
paid by the issuer to the underwriter.
 
  AIM's primary consideration in effecting a security transaction is to obtain
the best net price and the most favorable execution of the order. To the extent
that the executions and prices offered by more than one dealer are comparable,
AIM may, in its discretion, effect transactions with dealers that furnish
statistical, research or other information or services which are deemed by AIM
to be beneficial to the Portfolio's investment programs. Certain research
services furnished by dealers may be useful to clients of AIM other than the 
Portfolio. Similarly, any research services received by AIM through placement 
of portfolio transactions of other clients may be of value to AIM in 
fulfilling its obligations to the Portfolio.
 
                              GENERAL INFORMATION
 
ORGANIZATION AND DESCRIPTION OF SHARES
 
  The Trust is a Delaware business trust. The Trust was originally incorporated
in Maryland on January 24, 1977, but had no operations prior to November 10,
1980. Effective December 31, 1986, the Trust was reorganized as a Massachusetts
business trust; and effective October 15, 1993, the Trust was reorganized as a
Delaware business trust. On October 15, 1993, the Portfolio succeeded to the
assets and assumed the liabilities of the Treasury Portfolio (the "Predecessor
Portfolio") of Short-Term Investments Co., a Massachusetts business trust
("STIC"), pursuant to an Agreement and Plan of Reorganization between the Trust
and STIC. All historical financial and other information contained in this
Prospectus for periods prior to October 15, 1993 relating to the Portfolio (or a
class thereof) is that of the Predecessor Portfolio (or the corresponding class
thereof). Shares of beneficial interest of the Trust are divided into seven
classes. Five classes, including the Class, represent interests in the Portfolio
and two classes represent interests in the Treasury TaxAdvantage Portfolio. Each
class of shares has a par value of $.01 per share. The other classes of the
Trust may have different sales charges and other expenses which may affect
performance. An investor may obtain information concerning the Trust's other
classes by contacting FMC.
 
  All shares of the Trust have equal rights with respect to voting, except that
the holders of shares of a particular portfolio or class will have the exclusive
right to vote on matters pertaining solely to that portfolio or class. For
example, holders of shares of a particular portfolio will have the exclusive
right to vote on any investment advisory agreement or investment restriction
that relates only to such portfolio. In addition, if a portfolio is divided into
various classes, holders of shares of a particular class will have the exclusive
right to vote on any matter, such as distribution arrangements, which relates
solely to such class. The holders of shares of the Portfolio have distinctive
rights with respect to dividends and redemption which are more fully described
in this Prospectus. In the event of liquidation or termination of the Trust,
holders of shares of each portfolio will receive pro rata, subject to the rights
of creditors, (a) the proceeds of the sale of the assets held in the respective
portfolio to which such shares relate, less (b) the liabilities of the Trust
attributable or allocated to the respective portfolio based on the liquidation
value of the portfolio. Fractional shares of each portfolio have the same rights
as full shares to the extent of their proportionate interest.
 
                                       13
<PAGE>   14
 
 
  There will not normally be annual shareholders' meetings. Shareholders may
remove trustees from office by votes cast at a meeting of shareholders called
solely for such purpose or by written consent. A meeting of shareholders for the
sole purpose of considering removal of a trustee shall be called at the request
of the holders of 10% or more of the Trust's outstanding shares.
 
  As of December 1, 1997, The Bank of New York was the owner of record of 48.53%
of the outstanding shares of the Class. As long as The Bank of New York owns
over 25% of such shares, it may be presumed to be in "control" of the Cash
Management Class of the Treasury Portfolio, as defined in the 1940 Act.
 
  There are no preemptive or conversion rights applicable to any of the Trust's
shares. The Trust's shares, when issued, will be fully paid and non-assessable.
The Board of Trustees may create additional portfolios of the Trust without
shareholder approval.
 
TRANSFER AGENT AND CUSTODIAN
 
  The Bank of New York, 90 Washington Street, 11th Floor, New York, New York
10286, acts as custodian for the portfolio securities and cash of the Portfolio.
A I M Institutional Fund Services, Inc., 11 Greenway Plaza, Suite 100, Houston,
Texas 77046-1173, acts as transfer agent for the shares of the Class. It is
currently anticipated that, effective on or about December 29, 1997, A I M Fund
Services, Inc., a wholly owned subsidiary of AIM and a registered transfer
agent, will become the transfer agent to the Trust.
 
LEGAL COUNSEL
 
  The law firm of Ballard Spahr Andrews & Ingersoll, Philadelphia, Pennsylvania,
serves as counsel to the Trust and passes upon legal matters for the Trust.
 
SHAREHOLDER INQUIRIES
 
  Shareholder inquiries concerning the status of an account should be directed
to an investor's Institution, or to the Trust at 11 Greenway Plaza, Suite 100,
Houston, Texas 77046-1173, or may be made by calling (800) 877-7745.
 
                                       14
<PAGE>   15
 
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SHORT-TERM INVESTMENTS TRUST
11 Greenway Plaza, Suite 100                                                    PROSPECTUS
Houston, Texas 77046-1173
(800) 877-7745
                                                                              December 17, 1997
INVESTMENT ADVISOR
A I M ADVISORS, INC.
11 Greenway Plaza, Suite 100                                                     SHORT-TERM
Houston, Texas 77046-1173                                                     INVESTMENTS TRUST
(713) 626-1919

DISTRIBUTOR
FUND MANAGEMENT COMPANY                                                      ---------------------
11 Greenway Plaza, Suite 100
Houston, Texas 77046-1173                                                      TREASURY PORTFOLIO
(800) 877-7745
                                                                             ---------------------
AUDITORS
KPMG PEAT MARWICK LLP
700 Louisiana
Houston, Texas 77002                                                         CASH MANAGEMENT CLASS

CUSTODIAN
THE BANK OF NEW YORK
90 Washington Street,
11th Floor
New York, New York 10286
                                                                               TABLE OF CONTENTS
TRANSFER AGENT
A I M INSTITUTIONAL FUND SERVICES, INC.                                                                          PAGE
11 Greenway Plaza, Suite 100                                     Summary......................................     2
Houston, Texas 77046-1173                                        Table of Fees and Expenses...................     4
                                                                 Financial Highlights.........................     5
NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY                        Suitability for Investors....................     5
INFORMATION OR TO MAKE ANY REPRESENTATIONS                       Investment Program...........................     5
NOT CONTAINED IN THIS PROSPECTUS IN                              Purchase of Shares...........................     7
CONNECTION WITH THE OFFERING MADE BY THIS                        Redemption of Shares.........................     9
PROSPECTUS, AND IF GIVEN OR MADE, SUCH                           Dividends....................................     9
INFORMATION OR REPRESENTATIONS MUST NOT BE                       Taxes........................................    10
RELIED UPON AS HAVING BEEN AUTHORIZED BY                         Net Asset Value..............................    10
THE TRUST OR THE DISTRIBUTOR. THIS                               Yield Information............................    11
PROSPECTUS DOES NOT CONSTITUTE AN OFFER IN                       Reports to Shareholders......................    11
ANY JURISDICTION TO ANY PERSON TO WHOM                           Management of the Trust......................    11
SUCH OFFERING MAY NOT LAWFULLY BE MADE.                          General Information..........................    13

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