SHORT TERM INVESTMENTS TRUST
497, 1997-12-22
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<PAGE>   1
SHORT-TERM
INVESTMENTS TRUST
 
                          Prospectus
- --------------------------------------------------------------------------------

                               The Treasury Portfolio is a money market fund
TREASURY                  whose investment objective is the maximization of
PORTFOLIO                 current income to the extent consistent with the
INSTITUTIONAL             preservation of capital and the maintenance of
CLASS                     liquidity. The Treasury Portfolio seeks to achieve its
                          objective by investing in direct obligations of the
DECEMBER 17, 1997         U.S. Treasury and repurchase agreements secured by
                          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.
                          This Prospectus relates solely to the Institutional
                          Class of the Treasury Portfolio, a class of shares
                          designed to be a convenient vehicle in which
                          institutions, particularly banks, acting for
                          themselves or in a fiduciary, advisory, agency,
                          custodial or other similar capacity 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 INSTITUTIONAL 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. A
                          COPY OF THE STATEMENT OF ADDITIONAL INFORMATION IS
                          ATTACHED HERETO. 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) 659-1005
<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 Institutional 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 preservations
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 Personal
Investment Class, Private Investment Class, Cash Management 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 a separate
prospectus. 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 and economical vehicle in which
institutions, particularly banks, acting for themselves or in a fiduciary,
advisory, agency, custodial or other similar capacity can invest short-term cash
reserves. Although shares of the Class may not be purchased by individuals
directly, institutions may purchase shares for accounts maintained by
individuals. See "Suitability for Investors." For the fiscal year ended August
31, 1997, the expenses of operation for the Class represented 0.09% of the
average daily net assets of the Class.
 
PURCHASE OF SHARES
 
  Shares of the Class are sold at net asset value without a sales charge. 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 federal funds or other 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 in federal funds on the same day.
See "Redemption of Shares."
 
DIVIDENDS
 
  The net income of each 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 held by 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 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
 
                                        2
<PAGE>   3
advisor to investment companies. Under an Administrative Services Agreement, AIM
may be reimbursed by the Trust for its costs of performing certain accounting
and other administrative services for the Trust. See "Management of the Trust --
Investment Advisor" and "-- Administrative Services." Under a Transfer Agency
and Service Agreement, A I M Institutional 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
 
  Fund Management Company ("FMC") acts as the exclusive distributor of the
Trust's shares. FMC does not receive any fee for distribution services from the
Trust. See "Purchase of Shares."
 
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 -- INSTITUTIONAL CLASS
  (as a percentage of average net assets)
  Management fees...........................................                 0.06%
  12b-1 fees................................................                 None
  Other expenses:
     Custodian fees.........................................      0.01%
     Other..................................................      0.02%
                                                                ------
       Total other expenses.................................                 0.03%
                                                                             ----
  Total portfolio operating expenses -- Institutional
     Class..................................................                 0.09%
                                                                             ====
</TABLE>
 
- ---------------
 
* Beneficial owners of shares of the Class should consider the effect of any
  charges imposed by their bank or other financial institution for various
  services.
 
EXAMPLE
 
  An investor would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<S>                                                           <C>
 1 year.....................................................    $ 1
 3 years....................................................    $ 3
 5 years....................................................    $ 5
10 years....................................................    $12
</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. 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 -- Institutional 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 each of the years in the ten-year period ended August
31, 1997. 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         1992         1991
                                ----------      ----------   ----------   ----------   ----------   ----------   ----------
<S>                             <C>             <C>          <C>          <C>          <C>          <C>          <C>
Net asset value, beginning of
 period.......................  $     1.00      $     1.00   $     1.00   $     1.00   $     1.00   $     1.00   $     1.00
Income from investment
 operations:
 Net investment income........        0.05            0.05         0.06         0.04         0.03         0.05         0.07
                                ----------      ----------   ----------   ----------   ----------   ----------   ----------
Less distributions:
 Dividends from net investment
   income.....................       (0.05)          (0.05)       (0.06)       (0.04)       (0.03)       (0.05)       (0.07)
                                ----------      ----------   ----------   ----------   ----------   ----------   ----------
Net asset value, end of
 period.......................  $     1.00      $     1.00   $     1.00   $     1.00   $     1.00   $     1.00   $     1.00
                                ==========      ==========   ==========   ==========   ==========   ==========   ==========
Total return..................        5.47%           5.57%        5.66%        3.53%        3.22%        4.56%        7.04%
                                ==========      ==========   ==========   ==========   ==========   ==========   ==========
Ratios/supplemental data:
 Net assets, end of period
   (000s omitted).............  $3,408,010      $2,335,441   $2,669,637   $2,452,389   $3,652,672   $3,835,387   $2,437,902
                                ==========      ==========   ==========   ==========   ==========   ==========   ==========
Ratio of expenses to average
 net assets...................        0.09%(a)        0.09%        0.10%        0.08%        0.08%        0.09%        0.10%
                                ==========      ==========   ==========   ==========   ==========   ==========   ==========
Ratio of net investment income
 to average net assets........        5.35%(a)        5.43%        5.53%        3.39%        3.17%        4.38%        6.73%
                                ==========      ==========   ==========   ==========   ==========   ==========   ==========
 
<CAPTION>
                                   1990         1989         1988
                                ----------   ----------   ----------
<S>                             <C>          <C>          <C>
Net asset value, beginning of
 period.......................  $     1.00   $     1.00   $     1.00
Income from investment
 operations:
 Net investment income........        0.08         0.09         0.07
                                ----------   ----------   ----------
Less distributions:
 Dividends from net investment
   income.....................       (0.08)       (0.09)       (0.07)
                                ----------   ----------   ----------
Net asset value, end of
 period.......................  $     1.00   $     1.00   $     1.00
                                ==========   ==========   ==========
Total return..................        8.52%        9.03%        6.98%
                                ==========   ==========   ==========
Ratios/supplemental data:
 Net assets, end of period
   (000s omitted).............  $1,703,460   $1,189,822   $1,121,144
                                ==========   ==========   ==========
Ratio of expenses to average
 net assets...................        0.12%        0.11%        0.13%
                                ==========   ==========   ==========
Ratio of net investment income
 to average net assets........        8.19%        8.69%        6.76%
                                ==========   ==========   ==========
</TABLE>
 
- ---------------
 
(a) Ratios are based on average net assets of $2,873,371,753.
 
                                        5
<PAGE>   6
 
                           SUITABILITY FOR INVESTORS
 
  The Class is intended for use primarily by institutions, particularly banks,
acting for themselves or in a fiduciary, advisory, agency, custodial or other
similar capacity. They are designed to be a convenient and economical vehicle in
which such institutions can invest short-term cash reserves. Shares of the Class
may not be purchased directly by individuals, although institutions may purchase
shares for accounts maintained by individuals. Prospective investors should
determine if an investment in the Class is consistent with the objectives of an
account and with applicable state and federal laws and regulations.
 
  An investment in the Class may relieve the institution of many of the
investment and administrative burdens encountered when investing in money market
instruments directly. These include: selection of portfolio investments;
surveying the market for the best price at which to buy and sell; valuation of
portfolio securities; selection and scheduling of maturities; receipt, delivery
and safekeeping of securities; and portfolio record keeping. It is anticipated
that most investors will perform their own sub-accounting. To assist these
institutions, information concerning the dividends declared by the Portfolios on
any particular day will normally be available by 5:00 p.m. Eastern Time on that
day.
 
  Investors in 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 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 Class. However, these
expenses are expected to be relatively small due primarily to the following
factors: the Class will have a small number of shareholders who do not need many
of the services provided by other money market investment companies, thereby
resulting in lower transfer agent fees and costs for printing reports and proxy
statements; sales of the shares of the Class to institutions acting for
themselves or in a fiduciary capacity are exempt from the registration
requirements of most state securities laws, thereby resulting in reduced state
registration fees; and the relatively low investment advisory fee paid to AIM.
 
                               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 certain investment
practices described below. 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.
 
                                        6
<PAGE>   7
  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 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.
 
                                        7
<PAGE>   8
 
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; or
 
          (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 record keeping, 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(R) Remote, a 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 on 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.
 
  Subject to the conditions stated above and 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 below 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
4:00 p.m. Eastern Time will earn the dividend declared on the date of purchase.
 
  Payments for shares of the Class purchased must be in the form of federal
funds or other funds immediately available to the Portfolio. Federal Reserve
wires should be sent as early as possible in order to facilitate crediting to
the shareholder's account.
 
                                        8
<PAGE>   9
 
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 to purchase shares must specify that it is
for the purchase of "Shares of the Institutional Class of the Treasury
Portfolio," otherwise any funds received will be returned to the sending
institution.
 
  The minimum initial investment in the Class is $1,000,000. Institutions may be
requested to maintain separate Master Accounts in the shares of the Class held
by the institution (i) for its own account, for the account of other
institutions and for accounts for which the institution acts as a fiduciary, and
(ii) for accounts for which the institution acts in some other capacity. An
institution's Master Account(s) and sub-accounts in the shares of the Class may
be aggregated for the purpose of the minimum investment requirement. No minimum
amount is required for subsequent investments in the Portfolio nor are minimum
balances required. Prior to the initial purchase of shares of the Class, an
Account Application must be completed and sent to the Transfer Agent, 11
Greenway Plaza, Suite 100, Houston, Texas 77046-1173. Account Applications may
be obtained from the Transfer Agent. Any changes made to the information
provided in the Account Application must be made in writing or by completing a
new form and providing it to the Transfer Agent.
 
  Banks will be required to certify to the Trust that they comply with
applicable state law regarding registration as broker-dealers, or that they are
exempt from such registration.
 
  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(R) 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 by calling the
Trust.
 
  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
holidays.
 
  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.
 
                                        9
<PAGE>   10
 
                                   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's 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 of the Class 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, 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173 and will
become effective with dividends paid after its receipt by the Transfer Agent. If
a shareholder redeems all the shares of the Class 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.
 
  The Portfolio uses its best efforts to maintain its net asset value per share
of the Portfolio 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 of the Class 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.
 
                                       10
<PAGE>   11
 
                                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.
 
                               YIELD INFORMATION
 
  Yield information for the Class can be obtained by calling the Trust at (800)
659-1005. 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 the 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 annualized current
yield for the period) were 5.57% and 5.72%. These performance numbers are quoted
for illustration purposes only. 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 Portfolios'
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 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 objectives 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.
 
                                       11
<PAGE>   12
 
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, organized in 1976, 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 Fund. AIM is a wholly owned
subsidiary of AIM Management. AIM Management is a holding company engaged 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.
 
  For the fiscal year ended August 31, 1997, AIM received fees from the Trust
under an advisory agreement previously in effect, which provided for the same
level of compensation to AIM as the Advisory Agreement, with respect to the
Portfolio 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 0.09% of the Class' 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. 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.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
 
  AIM is responsible for decisions to buy and sell securities for the
Portfolios, 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.
 
                                       12
<PAGE>   13
                              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 of which five, 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.
 
  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.
 
  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 the Trust at 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173, or may
be made by calling (800) 659-1005.
 
OTHER INFORMATION
 
  This Prospectus sets forth basic information that investors should know about
the Trust and the Portfolio prior to investing. A Statement of Additional
Information has been filed with the SEC. Copies of the Statement of Additional
Information are available upon request and without charge by writing or calling
the Trust or FMC. This Prospectus omits certain information contained in the
registration statement filed with the SEC. Copies of the registration statement,
including items omitted herein, may be obtained from the SEC by paying the
charges prescribed under its rules and regulations.
 
                                       13
<PAGE>   14
 
                      [THIS PAGE INTENTIONALLY LEFT BLANK]
<PAGE>   15
                                   APPENDIX

                                                          STATEMENT OF
                                                          ADDITIONAL INFORMATION
 
                          SHORT-TERM INVESTMENTS TRUST
 
                               TREASURY PORTFOLIO
 
                            (CASH MANAGEMENT CLASS)
 
                             (INSTITUTIONAL CLASS)
 
                          (PERSONAL INVESTMENT CLASS)
 
                           (PRIVATE INVESTMENT CLASS)
 
                                (RESOURCE CLASS)
 
                               11 GREENWAY PLAZA
                                   SUITE 100
                           HOUSTON, TEXAS 77046-1173
                                 (800) 659-1005
 
                             ---------------------
 
         THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A PROSPECTUS.
 IT SHOULD BE READ IN CONJUNCTION WITH A PROSPECTUS OF EACH OF THE ABOVE NAMED
                                     FUNDS,
                   COPIES OF WHICH MAY BE OBTAINED BY WRITING
                  FUND MANAGEMENT COMPANY, 11 GREENWAY PLAZA,
                      SUITE 100, HOUSTON, TEXAS 77046-1173
                           OR CALLING (800) 659-1005
 
                             ---------------------
 
          STATEMENT OF ADDITIONAL INFORMATION DATED DECEMBER 17, 1997
  RELATING TO THE PROSPECTUS OF EACH OF THE FOLLOWING CLASSES OF THE TREASURY
                                   PORTFOLIO:
           CASH MANAGEMENT CLASS PROSPECTUS DATED DECEMBER 17, 1997,
            INSTITUTIONAL CLASS PROSPECTUS DATED DECEMBER 17, 1997,
         PERSONAL INVESTMENT CLASS PROSPECTUS DATED DECEMBER 17, 1997,
          PRIVATE INVESTMENT CLASS PROSPECTUS DATED DECEMBER 17, 1997
             AND RESOURCE CLASS PROSPECTUS DATED DECEMBER 17, 1997


                                     A-1
<PAGE>   16
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
Introduction................................................     A-3
General Information about the Trust.........................     A-3
     The Trust and Its Shares...............................     A-3
Management..................................................     A-5
     Trustees and Officers..................................     A-5
     Remuneration of Trustees...............................     A-8
     Investment Advisor.....................................     A-9
     Administrative Services................................    A-10
     Expenses...............................................    A-11
     Banking Regulations....................................    A-11
     Transfer Agent and Custodian...........................    A-11
     Reports................................................    A-12
     Fee Waivers............................................    A-12
     Principal Holders of Securities........................    A-12
Purchases and Redemptions...................................    A-14
     Net Asset Value Determination..........................    A-15
     Distribution Agreement.................................    A-15
     Distribution Plan......................................    A-15
     Performance Information................................    A-16
Investment Program and Restrictions.........................    A-17
     Investment Program.....................................    A-17
     Eligible Securities....................................    A-17
     Investment Restrictions................................    A-17
     Other Investment Policies..............................    A-18
Portfolio Transactions......................................    A-18
Tax Matters.................................................    A-19
     Qualification as a Regulated Investment Company........    A-19
     Excise Tax on Regulated Investment Companies...........    A-20
     Portfolio Distributions................................    A-20
     Sale or Redemption of Shares...........................    A-20
     Foreign Shareholders...................................    A-21
     Effect of Future Legislation; Local Tax
      Considerations........................................    A-21
Financial Statements........................................      FS
</TABLE>
 
                                     A-2
<PAGE>   17
 
                                  INTRODUCTION
 
  The Treasury Portfolio (the "Portfolio") is an investment portfolio of
Short-Term Investments Trust (the "Trust"), a mutual fund. The rules and
regulations of the United States Securities and Exchange Commission (the "SEC")
require all mutual funds to furnish prospective investors certain information
concerning the activities of the fund being considered for investment. This
information is included in the Cash Management Class Prospectus dated December
17, 1997, the Institutional Class Prospectus dated December 17, 1997, the
Personal Investment Class Prospectus dated December 17, 1997, the Private
Investment Class Prospectus dated December 17, 1997 and the Resource Class
Prospectus dated December 17, 1997 (each a "Prospectus"). Additional copies of
each Prospectus and this Statement of Additional Information may be obtained
without charge by writing the principal distributor of the Trust's shares, Fund
Management Company ("FMC"), 11 Greenway Plaza, Suite 100, Houston, Texas
77046-1173, or by calling (800) 659-1005. Investors must receive a Prospectus
before they invest.
 
  This Statement of Additional Information is intended to furnish prospective
investors with additional information concerning each class of the Portfolio.
Some of the information required to be in this Statement of Additional
Information is also included in each Prospectus; and, in order to avoid
repetition, reference will be made to sections of the applicable Prospectus.
Additionally, each Prospectus and this Statement of Additional Information omit
certain information contained in the registration statement filed with the SEC.
Copies of the registration statement, including items omitted from each
Prospectus and this Statement of Additional Information, may be obtained from
the SEC by paying the charges prescribed under its rules and regulations.
 
                      GENERAL INFORMATION ABOUT THE TRUST
 
THE TRUST AND ITS SHARES
 
  The Trust is an open-end diversified management series investment company
which was originally organized as a corporation under the laws of the State of
Maryland on January 24, 1977, but which had no operations prior to November 10,
1980. The Trust was reorganized as a business trust under the laws of the
Commonwealth of Massachusetts on December 31, 1986. The Trust was again
reorganized as a business trust under the laws of the State of Delaware on
October 15, 1993. A copy of the Agreement and Declaration of Trust (the
"Declaration of Trust") establishing the Trust is on file with the SEC. 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 Statement of
Additional Information 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
redeemable at the net asset value thereof at the option of the shareholder or at
the option of the Trust in certain circumstances. For information concerning the
methods of redemption and the rights of share ownership, investors should
consult each Prospectus under the caption "General Information" and "Redemption
of Shares."
 
  The Trust offers on a continuous basis shares representing an interest in one
of two portfolios: the Portfolio and the Treasury TaxAdvantage Portfolio
(together, the "Portfolios"). The Portfolio consists of the following five
classes of shares: Cash Management Class, Institutional Class, Personal
Investment Class, Private Investment Class and Resource Class. Each class of
shares is sold pursuant to a separate Prospectus and this joint Statement of
Additional Information. Each such class has different shareholder qualifications
and bears expenses differently. This Statement of Additional Information relates
to each class of the Portfolio. The classes of the Treasury TaxAdvantage
Portfolio are offered pursuant to separate prospectuses and a separate statement
of additional information.
 
  Shares of beneficial interest of the Trust will be redeemable at the net asset
value thereof at the option of the shareholder or at the option of the Trust in
certain circumstances. For information concerning the methods of redemption and
the rights of share ownership, investors should consult the Prospectus under the
captions "Redemption of Shares."
 
  As used in the Prospectus, the term "majority of the outstanding shares" of
the Trust, a particular portfolio or a particular class means, respectively, the
vote of the lesser of (i) 67% or more of the shares of the Trust, such portfolio
or such class present at a meeting of the Trust's shareholders, if the holders
of more than 50% of the outstanding shares of the Trust, such portfolio or such
class are present or represented by proxy, or (ii) more than 50% of the
outstanding shares of the Trust, such portfolio or such class.
 
  Shareholders of the Trust do not have cumulative voting rights. Therefore the
holders of more than 50% of the outstanding shares of all series or classes
voting together for election of trustees may elect all of the members of the
Board of Trustees and in such event, the remaining holders cannot elect any
members of the Board of Trustees.
 
                                     A-3
<PAGE>   18
 
  The Declaration of Trust provides for the perpetual existence of the Trust.
The Trust, either Portfolio and any class thereof, however, may be terminated
at any time, upon the recommendation of the Board of Trustees, by vote of a
majority of the outstanding shares of the Trust, such Portfolio and such class,
respectively; provided, however, that the Board of Trustees may terminate, with
such shareholder approval, the Trust, either Portfolio and any class thereof
with respect to which there are fewer than 100 holders of record.
 
  The Declaration of Trust permits the trustees to issue an unlimited number of
full and fractional shares, of $.01 par value, of each class of shares of
beneficial interest of the Trust. The Board of Trustees may establish additional
series or classes of shares from time to time without shareholder approval.
Additional information concerning the rights of share ownership is set forth in
the prospectus applicable to each such class or series of shares of the Trust.
 
  The assets received by the Trust for the issue or sale of shares of each class
relating to a portfolio and all income, earnings, profits, losses and proceeds
therefrom, subject only to the rights of creditors, will be allocated to that
portfolio, and constitute the underlying assets of that portfolio. The
underlying assets of each portfolio will be segregated and will be charged with
the expenses with respect to that portfolio and with a share of the general
expenses of the Trust. While certain expenses of the Trust will be allocated to
the separate books of account of each portfolio, certain other expenses may be
legally chargeable against the assets of the entire Trust.
 
  Under Delaware law, shareholders of a Delaware business trust shall be
entitled to the same limitations of liability extended to shareholders of
private for-profit corporations, however, there is a remote possibility that
shareholders could, under certain circumstances, be held liable for the
obligations of the Trust to the extent the courts of another state which does
not recognize such limited liability were to apply the laws of such state to a
controversy involving such obligations. However, the Declaration of Trust
disclaims shareholder liability for acts or obligations of the Trust and
requires that notice of such disclaimer be given in each agreement, obligation
or instrument entered into or executed by the Trust or the trustees to all
parties, and each party thereto must expressly waive all rights of action
directly against shareholders of the Trust. The Declaration of Trust provides
for indemnification out of the Trust's property for all losses and expenses of
any shareholder of the Trust held liable on account of being or having been a
shareholder. Thus, the risk of a shareholder incurring financial loss due to
shareholder liability is limited to circumstances in which the Trust would be
unable to meet its obligations and wherein the complaining party was held not to
be bound by the disclaimer.
 
  The Declaration of Trust further provides that the trustees will not be liable
for errors of judgment or mistakes of fact or law. However, nothing in the
Declaration of Trust protects a trustee against any liability to which a trustee
would otherwise be subject by reason of willful misfeasance, bad faith, gross
negligence, or reckless disregard of the duties involved in the conduct of his
office. The Declaration of Trust provides for indemnification by the Trust of
the trustees and the officers of the Trust except with respect to any matter as
to which any such person did not act in good faith in the reasonable belief that
his action was in or not opposed to the best interests of the Trust. Such person
may not be indemnified against any liability to the Trust or to the Trust's
shareholders to which he would otherwise be subject by reason of willful
misfeasance, bad faith, gross negligence or reckless disregard of the duties
involved in the conduct of his office. The Declaration of Trust also authorizes
the purchase of liability insurance on behalf of trustees and officers.
 
  As described in the Prospectus, the Trust will not normally hold annual
shareholders' meetings. At such time as less than a majority of the trustees
have been elected by the shareholders, the trustees then in office will call a
shareholders' meeting for the election of trustees. In addition, trustees may be
removed from office by a written consent signed by the holders of two-thirds of
the outstanding shares of the Trust and filed with the Trust's custodian or by a
vote of the holders of two-thirds of the outstanding shares at a meeting duly
called for that purpose, which meeting shall be held upon written request of the
holders of not less than 10% of the outstanding shares of the Trust.
 
                                     A-4
<PAGE>   19
 
                                   MANAGEMENT
 
TRUSTEES AND OFFICERS
 
  The trustees and officers of the Trust and their principal occupations during
at least the last five years are set forth below.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                        POSITIONS HELD
         NAME, ADDRESS AND AGE          WITH REGISTRANT      PRINCIPAL OCCUPATION DURING AT LEAST THE PAST 5 YEARS
<S>  <C>                                <C>                  <C>                                                    <C>
- ------------------------------------------------------------------------------------------------------------------
     *CHARLES T. BAUER (78)              Trustee and         Chairman of the Board of Directors, A I M Management
     11 Greenway Plaza, Suite 100          Chairman          Group Inc., A I M Advisors, Inc., A I M Capital
     Houston, TX 77046                                       Management, Inc., A I M Distributors, Inc., A I M
                                                             Fund Services, Inc., A I M Institutional Fund
                                                             Services, Inc. and Fund Management Company; and Vice
                                                             Chairman and Director, AMVESCAP PLC.
- ------------------------------------------------------------------------------------------------------------------
     BRUCE L. CROCKETT (53)                Trustee           Director, ACE Limited (insurance company). Formerly,
     906 Frome Lane                                          Director, President and Chief Executive Officer,
     McLean, VA 22102                                        COMSAT Corporation; and Chairman, Board of Governors
                                                             of INTELSAT (international communications company).
- ------------------------------------------------------------------------------------------------------------------
     OWEN DALY II (73)                     Trustee           Director, Cortland Trust Inc. (investment company).
     Six Blythewood Road                                     Formerly, Director, CF & I Steel Corp., Monumental
     Baltimore, MD 21210                                     Life Insurance Company and Monumental General
                                                             Insurance Company; and Chairman of the Board of
                                                             Equitable Bancorporation.
- ------------------------------------------------------------------------------------------------------------------
     JACK M. FIELDS (45)                   Trustee           Formerly, Member of the U.S. House of
     Texana Global, Inc.                                     Representatives.
     8810 Will Clayton Parkway
     Jetero Plaza, Suite E
     Humble, TX 77338
- ------------------------------------------------------------------------------------------------------------------
     **CARL FRISCHLING (60)                Trustee           Partner, Kramer, Levin, Naftalis & Frankel (law
     919 Third Avenue                                        firm); and Director, ERD Waste, Inc. (waste
     New York, NY 10022                                      management company), Aegis Consumer Finance (auto
                                                             leasing company) and Lazard Funds, Inc. (investment
                                                             companies). Formerly, Partner, Reid & Priest (law
                                                             firm); and, prior thereto, Partner, Spengler Carlson
                                                             Gubar Brodsky & Frischling (law firm).
- ------------------------------------------------------------------------------------------------------------------
     *ROBERT H. GRAHAM (51)              Trustee and         Director, President and Chief Executive Officer,
     11 Greenway Plaza, Suite 100         President          A I M Management Group Inc.; Director and President,
     Houston, TX 77046                                       A I M Advisors, Inc.; and Director and Senior Vice
                                                             President, A I M Capital Management, Inc., A I M
                                                             Distributors, Inc., A I M Fund Services, Inc., A I M
                                                             Institutional Fund Services, Inc. and Fund Management
                                                             Company; and Director, AMVESCAP PLC, Chairman of the
                                                             Board of Directors, AIM Funds Group Canada Inc.
- ------------------------------------------------------------------------------------------------------------------
</TABLE>
 
- ---------------
 
 * A trustee who is an "interested person" of the Trust and AIM as defined in
   the 1940 Act.
 
** A trustee who is an "interested person" of the Trust as defined in the 1940
   Act.
 
                                        A-5
<PAGE>   20
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                        POSITIONS HELD
         NAME, ADDRESS AND AGE          WITH REGISTRANT      PRINCIPAL OCCUPATION DURING AT LEAST THE PAST 5 YEARS
<S>  <C>                                <C>                  <C>                                                    <C>
- ------------------------------------------------------------------------------------------------------------------
     JOHN F. KROEGER (72)                  Trustee           Director, Flag Investors International Fund, Inc.,
     37 Pippins Way                                          Flag Investors Emerging Growth Fund, Inc., Flag
     Morristown, NJ 07960                                    Investors Telephone Income Fund, Inc., Flag Investors
                                                             Equity Partners Fund, Inc., Total Return U.S.
                                                             Treasury Fund, Inc., Flag Investors Intermediate Term
                                                             Income Fund, Inc., Managed Municipal Fund, Inc., Flag
                                                             Investors Value Builder Fund, Inc., Flag Investors
                                                             Maryland Intermediate Tax-Free Income Fund, Inc.,
                                                             Flag Investors Real Estate Securities Fund, Inc.,
                                                             Alex. Brown Cash Reserve Fund, Inc. and North
                                                             American Government Bond Fund, Inc. (investment
                                                             companies). Formerly, Consultant, Wendell & Stockel
                                                             Associates, Inc. (consulting firm).
- ------------------------------------------------------------------------------------------------------------------
     LEWIS F. PENNOCK (55)                 Trustee           Attorney in private practice in Houston, Texas.
     6363 Woodway, Suite 825
     Houston, TX 77057
- ------------------------------------------------------------------------------------------------------------------
     IAN W. ROBINSON (74)                  Trustee           Formerly, Executive Vice President and Chief
     183 River Drive                                         Financial Officer, Bell Atlantic Management Services,
     Tequesta, FL 33469                                      Inc. (provider of centralized management services to
                                                             telephone companies); Executive Vice President, Bell
                                                             Atlantic Corporation (parent of seven telephone
                                                             companies); and Vice President and Chief Financial
                                                             Officer, Bell Telephone Company of Pennsylvania and
                                                             Diamond State Telephone Company.
- ------------------------------------------------------------------------------------------------------------------
     LOUIS S. SKLAR (58)                   Trustee           Executive Vice President, Development and Operations,
     Transco Tower, 50th Floor                               Hines Interests Limited Partnership (real estate
     2800 Post Oak Blvd.                                     development).
     Houston, TX 77056
- ------------------------------------------------------------------------------------------------------------------
     ***JOHN J. ARTHUR (53)              Senior Vice         Director, Senior Vice President and Treasurer, A I M
     11 Greenway Plaza, Suite 100       President and        Advisors, Inc.; and Vice President and Treasurer,
     Houston, TX 77046                    Treasurer          A I M Management Group Inc., A I M Capital
                                                             Management, Inc., A I M Distributors, Inc., A I M
                                                             Fund Services, Inc., A I M Institutional Fund
                                                             Services Inc. and Fund Management Company.
- ------------------------------------------------------------------------------------------------------------------
     GARY T. CRUM (50)                   Senior Vice         Director and President, A I M Capital Management,
     11 Greenway Plaza, Suite 100         President          Inc.; Director and Senior Vice President, A I M
     Houston, TX 77046                                       Management Group Inc., A I M Advisors, Inc.; and
                                                             Director, A I M Distributors, Inc. and AMVESCAP PLC.
- ------------------------------------------------------------------------------------------------------------------
     ***CAROL F. RELIHAN (43)            Senior Vice         Director, Senior Vice President, General Counsel and
     11 Greenway Plaza, Suite 100       President and        Secretary, A I M Advisors, Inc.; Vice President,
     Houston, TX 77046                    Secretary          General Counsel and Secretary, A I M Management Group
                                                             Inc.; Director, Vice President and General Counsel,
                                                             Fund Management Company; General Counsel and Vice
                                                             President, A I M Fund Services, Inc. and A I M
                                                             Institutional Fund Services, Inc.; Vice President,
                                                             A I M Capital Management, Inc., A I M
                                                             Distributors,Inc.
- ------------------------------------------------------------------------------------------------------------------
</TABLE>
 
- ---------------
 
*** Mr. Arthur and Ms. Relihan are married to each other.
 
                                     A-6
<PAGE>   21
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                        POSITIONS HELD
         NAME, ADDRESS AND AGE          WITH REGISTRANT      PRINCIPAL OCCUPATION DURING AT LEAST THE PAST 5 YEARS
<S>  <C>                                <C>                  <C>                                                    <C>
- ------------------------------------------------------------------------------------------------------------------
     DANA R. SUTTON (38)                Vice President       Vice President and Fund Controller, A I M Advisors,
     11 Greenway Plaza, Suite 100       and Assistant        Inc.; and Assistant Vice President and Assistant
     Houston, TX 77046                    Treasurer          Treasurer, Fund Management Company.
- ------------------------------------------------------------------------------------------------------------------
     MELVILLE B. COX (54)               Vice President       Vice President and Chief Compliance Officer, A I M
     11 Greenway Plaza, Suite 100                            Advisors, Inc., A I M Capital Management, Inc., A I M
     Houston, TX 77046                                       Distributors, Inc., A I M Fund Services, Inc., A I M
                                                             Institutional Fund Services, Inc. and Fund Management
                                                             Company.
- ------------------------------------------------------------------------------------------------------------------
     KAREN DUNN KELLEY (37)             Vice President       Senior Vice President, A I M Capital Management,
     11 Greenway Plaza, Suite 100                            Inc.; and Vice President, A I M Advisors, Inc.
     Houston, TX 77046
- ------------------------------------------------------------------------------------------------------------------
     J. ABBOTT SPRAGUE (42)             Vice President       Director and President, Fund Management Company;
     11 Greenway Plaza, Suite 100                            Director and Senior Vice President, A I M Advisors,
     Houston, TX 77046                                       Inc. and A I M Institutional Fund Services, Inc.; and
                                                             Senior Vice President, A I M Management Group Inc.
- ------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  The standing committees of the Board of Trustees are the Audit Committee, the
Investments Committee, and the Nominating and Compensation Committee.
 
  The members of the Audit Committee are Messrs. Crockett, Daly, Fields,
Frischling, Kroeger, (Chairman), Pennock, Robinson and Sklar. The Audit
Committee is responsible for meeting with the Trust's auditors to review audit
procedures and results and to consider any matters arising from an audit to be
brought to the attention of the trustees as a whole with respect to the Trust's
fund accounting or its internal accounting controls, or for considering such
matters as may from time to time be set forth in a charter adopted by the Board
of Trustees and such committee.
 
  The members of the Investments Committee are Messrs. Bauer, Crockett, Daly
(Chairman), Fields, Frischling, Kroeger, Pennock, Robinson and Sklar. The
Investments Committee is responsible for reviewing portfolio compliance,
brokerage allocation, portfolio investment pricing issues, interim dividend and
distribution issues, or considering such matters as may from time to time be set
forth in a charter adopted by the Board of Trustees and such committee.
 
                                     A-7
<PAGE>   22
 
  The members of the Nominating and Compensation Committee are Messrs. Crockett,
Daly, Fields, Kroeger, Pennock (Chairman), Robinson and Sklar. The Nominating
and Compensation Committee is responsible for considering and nominating
individuals to stand for election as trustees who are not interested persons as
long as the Trust maintains a distribution plan pursuant to Rule 12b-1 under the
1940 Act, reviewing from time to time the compensation payable to the
disinterested trustees, or considering such matters as may from time to time be
set forth in a charter adopted by the Board of Trustees and such committee.
 
  All of the Trust's trustees also serve as directors or trustees of some or all
of the other investment companies managed or advised by A I M Advisors, Inc.
("AIM") or distributed and administered by FMC. Most of the Trust's executive
officers hold similar offices with some or all of such investment companies.
 
REMUNERATION OF TRUSTEES
 
  Each trustee is reimbursed for expenses incurred in connection with each
meeting of the Board of Trustees or any committee thereof. Each trustee who is
not an officer of the Trust is compensated for his services according to a fee
schedule which recognizes the fact that such trustee also serves as a director
or trustee of other regulated investment companies managed, administered or
distributed by AIM or its affiliates (the "AIM Funds"). Each such trustee
receives a fee, allocated among the AIM Funds for which he serves as a director
or trustee, which consists of an annual retainer component and a meeting fee
component.
 
  Set forth below is information regarding compensation paid or accrued for each
trustee of the Trust:
 
<TABLE>
<CAPTION>
                                                                       RETIREMENT
                                                     AGGREGATE          BENEFITS           TOTAL
                                                    COMPENSATION        ACCRUED         COMPENSATION
                                                        FROM             BY ALL           FROM ALL
                     TRUSTEE                          TRUST(1)        AIM FUNDS(2)      AIM FUNDS(3)
                     -------                        ------------      ------------      ------------
<S>                                                 <C>               <C>               <C>
Charles T. Bauer..................................       $    0           $     0           $     0
Bruce L. Crockett.................................        4,880            38,621            68,000
Owen Daly II......................................        4,879            82,607            68,000
Jack Fields(4)....................................        2,466                 0                 0
Carl Frischling...................................        4,880            56,683            68,000(5)
Robert H. Graham..................................            0                 0                 0
John F. Kroeger...................................        4,879            83,654            66,000
Lewis F. Pennock..................................        4,879            33,702            67,000
Ian W. Robinson...................................        4,880            64,973            68,000
Louis S. Sklar....................................        4,815            47,593            66,500
</TABLE>
 
- ---------------
(1) The total amount of compensation deferred by all Trustees of the Trust
    during the fiscal year ended August 31, 1997, including interest earned
    thereon, was $23,027
 
(2) During the fiscal year ended August 31, 1997, the total amount of expenses
    allocated to the Trust in respect of such retirement benefits was $30,214.
    Data reflects compensation for the calendar year ended December 31, 1996.
 
(3) Each serves as a Director or Trustee of a total of 11 registered investment
    companies advised by AIM (comprised of 47 portfolios). Data reflects total
    compensation for the calendar year ended December 31, 1996.
 
(4) Mr. Fields was not serving as a Director during the calendar year ending
    December 31, 1996.
 
(5) See also page 12 regarding fees earned by Mr. Frischling's law firm.
 
  AIM Funds Retirement Plan for Eligible Directors/Trustees
 
  Under the terms of the AIM Funds Retirement Plan for Eligible
Directors/Trustees (the "Plan"), each trustee (who is not an employee of any of
the AIM Funds, A I M Management Group Inc. or any of their affiliates) may be
entitled to certain benefits upon retirement from the Board of Trustees.
Pursuant to the Plan, the normal retirement date is the date on which the
eligible trustee has attained age 65 and has completed at least five years of
continuous service with one or more of the AIM Funds. Each eligible trustee is
entitled to receive an annual benefit from the AIM Funds commencing on the first
day of the calendar quarter coincident with or following his date of retirement
equal to 75% of the retainer paid or accrued by the AIM Funds for such trustee
during the twelve-month period immediately preceding the trustee's retirement
(including amounts deferred under a separate agreement between the AIM Funds and
the trustee) for the number of such trustee's years of service (not in excess of
10 years of service) completed with respect to any of the AIM Funds. Such
benefit is payable to each eligible trustee in quarterly installments. If an
eligible trustee dies after attaining the normal retirement date but before
receipt of any benefits under the Plan commences, the trustee's surviving spouse
(if any) shall receive a quarterly survivor's benefit equal to 50% of the amount
 
                                       A-8
<PAGE>   23
 
payable to the deceased trustee, for no more than ten years beginning the first
day of the calendar quarter following the date of the trustee's death. Payments
under the Plan are not secured or funded by any AIM Fund.
 
  Set forth below is a table that shows the estimated annual benefits payable to
an eligible trustee upon retirement assuming a specified level of compensation
and years of service classifications. The estimated credited years of service
for Messrs. Crockett, Daly, Fields, Frischling, Kroeger, Pennock, Robinson and
Sklar are 10, 10, 0, 20, 19, 15, 10 and 7 years, respectively.
 
                        ANNUAL RETAINER UPON RETIREMENT
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------
                        NUMBER OF
                        YEARS OF
                      SERVICE WITH    ANNUAL RETAINER PAID BY ALL AIM FUNDS
                      THE AIM FUNDS                  $80,000
<S>                   <C>             <C>                                   <C>
- --------------------------------------------------------------------------
                          10                         $60,000
- --------------------------------------------------------------------------
                           9                         $54,000
- --------------------------------------------------------------------------
                           8                         $48,000
- --------------------------------------------------------------------------
                           7                         $42,000
- --------------------------------------------------------------------------
                           6                         $36,000
- --------------------------------------------------------------------------
                           5                         $30,000
- --------------------------------------------------------------------------
</TABLE>
 
  Deferred Compensation Agreements
 
  Messrs. Daly, Frischling, Kroeger, Robinson and Sklar (for purposes of this
paragraph only, the "deferring trustees") have each executed a Deferred
Compensation Agreement (collectively, the "Agreements"). Pursuant to the
Agreements, the deferring trustees may elect to defer receipt of up to 100% of
their compensation payable by the Trust, and such amounts are placed into a
deferral account. Currently, the deferring trustees may select various AIM Funds
in which all or part of their deferral accounts shall be deemed to be invested.
Distributions from the deferring trustees' deferral accounts will be paid in
cash, generally in equal quarterly installments over a period of five (5) or ten
(10) years (depending on the Agreement) beginning on the date the deferring
trustee's retirement benefits commence under the Plan. The Trust's Board of
Trustees, in its sole discretion, may accelerate or extend the distribution of
such deferral accounts after the deferring trustee's termination of service as a
trustee of the Trust. If a deferring trustee dies prior to the distribution of
amounts in his deferral account, the balance of the deferral account will be
distributed to his designated beneficiary in a single lump sum payment as soon
as practicable after such deferring trustee's death. The Agreements are not
funded and, with respect to the payments of amounts held in the deferral
accounts, the deferring trustees have the status of unsecured creditors of the
Trust and of each other AIM Fund from which they are deferring compensation.
 
  The Portfolio paid legal fees of $13,565 for the year ended August 31, 1997
for services rendered by Kramer, Levin, Naftalis & Frankel as counsel to the
Board of Trustees. Carl Frischling, a trustee of the Trust, is a member of that
firm.
 
INVESTMENT ADVISOR
 
  A I M Advisors, Inc., 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173,
acts as the investment advisor of 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 advises or manages 55
investment company portfolios.
 
  Pursuant to the terms of the Advisory Agreement, AIM manages the investment of
the assets of the Portfolio. AIM obtains and evaluates economic, statistical and
financial information to formulate and implement investment policies for the
Portfolio. Any investment program undertaken by AIM will at all times be subject
to the policies and control of the Trust's Board of Trustees. AIM shall not be
liable to the Trust or to its shareholders for any act or omission by AIM or for
any loss sustained by the Trust or its shareholders except in the case of
willful misfeasance, bad faith, gross negligence or reckless disregard of duty.
 
  AIM and the Trust have adopted a Code of Ethics which requires investment
personnel (a) to pre-clear all personal securities transactions, (b) to file
reports regarding such transactions, and (c) to refrain from personally engaging
in (i) short-term trading of a security, (ii) transactions involving a security
within seven days of an AIM Fund transaction involving the same security, and
(iii) transactions involving securities being considered for investment by an
AIM Fund. The Code also prohibits investment personnel from purchasing
securities in an initial public offering. Personal trading reports are reviewed
periodically by AIM, and the Board of Trustees reviews annually such reports
(including information on any substantial violations of the Code). Violations of
the Code may result in censure, monetary penalties, suspension or termination of
employment.
 
                                       A-9
<PAGE>   24
 
  As compensation for its services with respect to the Portfolio, AIM receives a
monthly fee which is calculated by applying the following annual rates to the
average daily net assets of the Portfolio:
 
<TABLE>
<CAPTION>
                         NET ASSETS                           RATE
                         ----------                           ----
<S>                                                           <C>
First $300 million..........................................    .15%
Over $300 million to $1.5 billion...........................    .06%
Over $1.5 billion...........................................    .05%
</TABLE>
 
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 Trust's shares are qualified for sale.
 
  The Advisory Agreement provides that, upon the request of the Board of
Trustees, AIM may perform or arrange for the performance of certain additional
services on behalf of the Portfolio which are not required by the Advisory
Agreement. AIM may receive reimbursement or reasonable compensation for such
additional services, as may be agreed upon by AIM and the Board of Trustees,
based upon a finding by the Board of Trustees that the provision of such
services would be in the best interest of the Portfolio and its shareholders.
The Board of Trustees has made such a finding and, accordingly, has entered into
a Master Administrative Services Agreement under which AIM will provide the
additional services described below under the caption "Administrative Services."
 
  Pursuant to the Advisory Agreement between the Trust and AIM, currently in
effect, AIM received fees from the Trust for the fiscal years ended August 31,
1997, 1996 and 1995 with respect to the Portfolio in the amounts of $2,666,379,
$2,227,788 and $1,925,198, respectively. For the fiscal years ended August 31,
1997, 1996 and 1995, AIM waived no advisory fees with respect to the Portfolio.
 
  The Advisory Agreement was approved for its initial term by the Board of
Trustees on July 19, 1993. The Advisory Agreement will continue in effect until
February 28, 1999, and from year to year thereafter, provided that it is
specifically approved at least annually by the Trust's Board of Trustees and the
affirmative vote of a majority of the trustees who are not parties to the
Advisory Agreement or "interested persons" of any such party by votes cast in
person at a meeting called for such purpose. The Trust or AIM may terminate the
Advisory Agreement on 60 days' notice without penalty. The Advisory Agreement
terminates automatically in the event of its assignment, as defined in the 1940
Act.
 
  AIM is a wholly owned subsidiary of A I M Management Group Inc. ("AIM
Management"), 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173. AIM
Management is an indirect wholly owned subsidiary of AMVESCAP PLC, 11 Devonshire
Square, London EC2M 4YR, United Kingdom. AMVESCAP PLC and its subsidiaries are
an independent investment management group engaged in institutional investment
management and retail fund business in the United States, Europe and the Pacific
Region. Certain of the directors and officers of AIM are also executive officers
of the Trust and their affiliations are shown under "Trustees and Officers." The
address of each director and officer of AIM is 11 Greenway Plaza, Suite 100,
Houston, Texas 77046-1173.
 
  FMC is a registered broker-dealer and wholly owned subsidiary of AIM. FMC acts
as distributor of the Shares.
 
ADMINISTRATIVE SERVICES
 
  AIM also acts as the Portfolio's administrator pursuant to a Master
Administrative Services Agreement dated as of February 28, 1997 between AIM and
the Trust (the "Administrative Services Agreement").
 
  Under the Administrative Services Agreement, AIM performs accounting and other
administrative services for the Portfolio. As full compensation for the
performance of such services, AIM is reimbursed for any personnel and other
costs (including applicable office space, facilities and equipment) of
furnishing the services of a principal financial officer of the Trust and of
persons working under his supervision for maintaining the financial accounts and
books and records of the Trust, including calculation of the Portfolio's daily
net asset value, and preparing tax returns and financial statements for the
Portfolio. The method of calculating such reimbursements must be annually
approved, and the amounts paid will be periodically reviewed, by the Trust's
Board of Trustees.
 
  Under the Administrative Services Agreement, AIM was reimbursed for the fiscal
years ended August 31, 1997, 1996 and 1995, $99,273, $86,796 and $135,387,
respectively, for fund accounting services for the Portfolio.
 
  Under the terms of a Transfer Agency and Service Agreement, dated September
16, 1994, as amended, between the Trust and A I M Institutional Fund Services,
Inc. ("AIFS"), a registered transfer agent and wholly owned subsidiary of AIM,
as well as under previous agreements, AIFS received $414,190, $256,535 and
$114,179, for the fiscal years ended August 31, 1997, 1996 and 1995
respectively, for the provision of certain shareholder services for the
Portfolio.
 
                                      A-10
<PAGE>   25
 
  The members of the Nominating and Compensation Committee are Messrs. Crockett,
Daly, Fields, Kroeger, Pennock (Chairman), Robinson and Sklar. The Nominating
and Compensation Committee is responsible for considering and nominating
individuals to stand for election as trustees who are not interested persons as
long as the Trust maintains a distribution plan pursuant to Rule 12b-1 under the
1940 Act, reviewing from time to time the compensation payable to the
disinterested trustees, or considering such matters as may from time to time be
set forth in a charter adopted by the Board of Trustees and such committee.
 
  All of the Trust's trustees also serve as directors or trustees of some or all
of the other investment companies managed or advised by A I M Advisors, Inc.
("AIM") or distributed and administered by FMC. Most of the Trust's executive
officers hold similar offices with some or all of such investment companies.
 
REMUNERATION OF TRUSTEES
 
  Each trustee is reimbursed for expenses incurred in connection with each
meeting of the Board of Trustees or any committee thereof. Each trustee who is
not an officer of the Trust is compensated for his services according to a fee
schedule which recognizes the fact that such trustee also serves as a director
or trustee of other regulated investment companies managed, administered or
distributed by AIM or its affiliates (the "AIM Funds"). Each such trustee
receives a fee, allocated among the AIM Funds for which he serves as a director
or trustee, which consists of an annual retainer component and a meeting fee
component.
 
  Set forth below is information regarding compensation paid or accrued for each
trustee of the Trust:
 
<TABLE>
<CAPTION>
                                                                       RETIREMENT
                                                     AGGREGATE          BENEFITS           TOTAL
                                                    COMPENSATION        ACCRUED         COMPENSATION
                                                        FROM             BY ALL           FROM ALL
                     TRUSTEE                          TRUST(1)        AIM FUNDS(2)      AIM FUNDS(3)
                     -------                        ------------      ------------      ------------
<S>                                                 <C>               <C>               <C>
Charles T. Bauer..................................       $    0           $     0           $     0
Bruce L. Crockett.................................        4,880            38,621            68,000
Owen Daly II......................................        4,879            82,607            68,000
Jack Fields(4)....................................        2,466                 0                 0
Carl Frischling...................................        4,880            56,683            68,000(5)
Robert H. Graham..................................            0                 0                 0
John F. Kroeger...................................        4,879            83,654            66,000
Lewis F. Pennock..................................        4,879            33,702            67,000
Ian W. Robinson...................................        4,880            64,973            68,000
Louis S. Sklar....................................        4,815            47,593            66,500
</TABLE>
 
- ---------------
(1) The total amount of compensation deferred by all Trustees of the Trust
    during the fiscal year ended August 31, 1997, including interest earned
    thereon, was $23,027
 
(2) During the fiscal year ended August 31, 1997, the total amount of expenses
    allocated to the Trust in respect of such retirement benefits was $30,214.
    Data reflects compensation for the calendar year ended December 31, 1996.
 
(3) Each serves as a Director or Trustee of a total of 11 registered investment
    companies advised by AIM (comprised of 47 portfolios). Data reflects total
    compensation for the calendar year ended December 31, 1996.
 
(4) Mr. Fields was not serving as a Director during the calendar year ending
    December 31, 1996.
 
(5) See also page 12 regarding fees earned by Mr. Frischling's law firm.
 
  AIM Funds Retirement Plan for Eligible Directors/Trustees
 
  Under the terms of the AIM Funds Retirement Plan for Eligible
Directors/Trustees (the "Plan"), each trustee (who is not an employee of any of
the AIM Funds, A I M Management Group Inc. or any of their affiliates) may be
entitled to certain benefits upon retirement from the Board of Trustees.
Pursuant to the Plan, the normal retirement date is the date on which the
eligible trustee has attained age 65 and has completed at least five years of
continuous service with one or more of the AIM Funds. Each eligible trustee is
entitled to receive an annual benefit from the AIM Funds commencing on the first
day of the calendar quarter coincident with or following his date of retirement
equal to 75% of the retainer paid or accrued by the AIM Funds for such trustee
during the twelve-month period immediately preceding the trustee's retirement
(including amounts deferred under a separate agreement between the AIM Funds and
the trustee) for the number of such trustee's years of service (not in excess of
10 years of service) completed with respect to any of the AIM Funds. Such
benefit is payable to each eligible trustee in quarterly installments. If an
eligible trustee dies after attaining the normal retirement date but before
receipt of any benefits under the Plan commences, the trustee's surviving spouse
(if any) shall receive a quarterly survivor's benefit equal to 50% of the amount
 
                                     A-8
<PAGE>   26
 
payable to the deceased trustee, for no more than ten years beginning the first
day of the calendar quarter following the date of the trustee's death. Payments
under the Plan are not secured or funded by any AIM Fund.
 
  Set forth below is a table that shows the estimated annual benefits payable to
an eligible trustee upon retirement assuming a specified level of compensation
and years of service classifications. The estimated credited years of service
for Messrs. Crockett, Daly, Fields, Frischling, Kroeger, Pennock, Robinson and
Sklar are 10, 10, 0, 20, 19, 15, 10 and 7 years, respectively.
 
                       ANNUAL RETAINER UPON RETIREMENT
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------
                        NUMBER OF
                        YEARS OF
                      SERVICE WITH    ANNUAL RETAINER PAID BY ALL AIM FUNDS
                      THE AIM FUNDS                  $80,000
<S>                   <C>             <C>                                   <C>
- --------------------------------------------------------------------------
                          10                         $60,000
- --------------------------------------------------------------------------
                           9                         $54,000
- --------------------------------------------------------------------------
                           8                         $48,000
- --------------------------------------------------------------------------
                           7                         $42,000
- --------------------------------------------------------------------------
                           6                         $36,000
- --------------------------------------------------------------------------
                           5                         $30,000
- --------------------------------------------------------------------------
</TABLE>
 
  Deferred Compensation Agreements
 
  Messrs. Daly, Frischling, Kroeger, Robinson and Sklar (for purposes of this
paragraph only, the "deferring trustees") have each executed a Deferred
Compensation Agreement (collectively, the "Agreements"). Pursuant to the
Agreements, the deferring trustees may elect to defer receipt of up to 100% of
their compensation payable by the Trust, and such amounts are placed into a
deferral account. Currently, the deferring trustees may select various AIM Funds
in which all or part of their deferral accounts shall be deemed to be invested.
Distributions from the deferring trustees' deferral accounts will be paid in
cash, generally in equal quarterly installments over a period of five (5) or ten
(10) years (depending on the Agreement) beginning on the date the deferring
trustee's retirement benefits commence under the Plan. The Trust's Board of
Trustees, in its sole discretion, may accelerate or extend the distribution of
such deferral accounts after the deferring trustee's termination of service as a
trustee of the Trust. If a deferring trustee dies prior to the distribution of
amounts in his deferral account, the balance of the deferral account will be
distributed to his designated beneficiary in a single lump sum payment as soon
as practicable after such deferring trustee's death. The Agreements are not
funded and, with respect to the payments of amounts held in the deferral
accounts, the deferring trustees have the status of unsecured creditors of the
Trust and of each other AIM Fund from which they are deferring compensation.
 
  The Portfolio paid legal fees of $13,565 for the year ended August 31, 1997 
for services rendered by Kramer, Levin, Naftalis & Frankel as counsel to the
Board of Trustees. Carl Frischling, a trustee of the Trust, is a member of that
firm.
 
INVESTMENT ADVISOR
 
  A I M Advisors, Inc., 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173,
acts as the investment advisor of 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 advises or manages 55
investment company portfolios.
 
  Pursuant to the terms of the Advisory Agreement, AIM manages the investment of
the assets of the Portfolio. AIM obtains and evaluates economic, statistical and
financial information to formulate and implement investment policies for the
Portfolio. Any investment program undertaken by AIM will at all times be subject
to the policies and control of the Trust's Board of Trustees. AIM shall not be
liable to the Trust or to its shareholders for any act or omission by AIM or for
any loss sustained by the Trust or its shareholders except in the case of
willful misfeasance, bad faith, gross negligence or reckless disregard of duty.
 
  AIM and the Trust have adopted a Code of Ethics which requires investment
personnel (a) to pre-clear all personal securities transactions, (b) to file
reports regarding such transactions, and (c) to refrain from personally engaging
in (i) short-term trading of a security, (ii) transactions involving a security
within seven days of an AIM Fund transaction involving the same security, and
(iii) transactions involving securities being considered for investment by an
AIM Fund. The Code also prohibits investment personnel from purchasing
securities in an initial public offering. Personal trading reports are reviewed
periodically by AIM, and the Board of Trustees reviews annually such reports
(including information on any substantial violations of the Code). Violations of
the Code may result in censure, monetary penalties, suspension or termination of
employment.
 
                                     A-9
<PAGE>   27
 
  As compensation for its services with respect to the Portfolio, AIM receives a
monthly fee which is calculated by applying the following annual rates to the
average daily net assets of the Portfolio:
 
<TABLE>
<CAPTION>
                         NET ASSETS                           RATE
                         ----------                           ----
<S>                                                           <C>
First $300 million..........................................    .15%
Over $300 million to $1.5 billion...........................    .06%
Over $1.5 billion...........................................    .05%
</TABLE>
 
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 Trust's shares are qualified for sale.
 
  The Advisory Agreement provides that, upon the request of the Board of
Trustees, AIM may perform or arrange for the performance of certain additional
services on behalf of the Portfolio which are not required by the Advisory
Agreement. AIM may receive reimbursement or reasonable compensation for such
additional services, as may be agreed upon by AIM and the Board of Trustees,
based upon a finding by the Board of Trustees that the provision of such
services would be in the best interest of the Portfolio and its shareholders.
The Board of Trustees has made such a finding and, accordingly, has entered into
a Master Administrative Services Agreement under which AIM will provide the
additional services described below under the caption "Administrative Services."
 
  Pursuant to the Advisory Agreement between the Trust and AIM, currently in
effect, AIM received fees from the Trust for the fiscal years ended August 31,
1997, 1996 and 1995 with respect to the Portfolio in the amounts of $2,666,379,
$2,227,788 and $1,925,198, respectively.  For the fiscal years ended August 31,
1997, 1996 and 1995, AIM waived no advisory fees with respect to the Portfolio.
 
  The Advisory Agreement was approved for its initial term by the Board of
Trustees on July 19, 1993. The Advisory Agreement will continue in effect until
February 28, 1999, and from year to year thereafter, provided that it is
specifically approved at least annually by the Trust's Board of Trustees and the
affirmative vote of a majority of the trustees who are not parties to the
Advisory Agreement or "interested persons" of any such party by votes cast in
person at a meeting called for such purpose. The Trust or AIM may terminate the
Advisory Agreement on 60 days' notice without penalty. The Advisory Agreement
terminates automatically in the event of its assignment, as defined in the 1940
Act.
 
  AIM is a wholly owned subsidiary of A I M Management Group Inc. ("AIM
Management"), 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173. AIM
Management is an indirect wholly owned subsidiary of AMVESCAP PLC, 11 Devonshire
Square, London EC2M 4YR, United Kingdom. AMVESCAP PLC and its subsidiaries are
an independent investment management group engaged in institutional investment
management and retail fund business in the United States, Europe and the Pacific
Region. Certain of the directors and officers of AIM are also executive officers
of the Trust and their affiliations are shown under "Trustees and Officers." The
address of each director and officer of AIM is 11 Greenway Plaza, Suite 100,
Houston, Texas 77046-1173.
 
  FMC is a registered broker-dealer and wholly owned subsidiary of AIM. FMC acts
as distributor of the Shares.
 
ADMINISTRATIVE SERVICES
 
  AIM also acts as the Portfolio's administrator pursuant to a Master
Administrative Services Agreement dated as of February 28, 1997 between AIM and
the Trust (the "Administrative Services Agreement").
 
  Under the Administrative Services Agreement, AIM performs accounting and other
administrative services for the Portfolio. As full compensation for the
performance of such services, AIM is reimbursed for any personnel and other
costs (including applicable office space, facilities and equipment) of
furnishing the services of a principal financial officer of the Trust and of
persons working under his supervision for maintaining the financial accounts and
books and records of the Trust, including calculation of the Portfolio's daily
net asset value, and preparing tax returns and financial statements for the
Portfolio. The method of calculating such reimbursements must be annually
approved, and the amounts paid will be periodically reviewed, by the Trust's
Board of Trustees.
 
  Under the Administrative Services Agreement, AIM was reimbursed for the fiscal
years ended August 31, 1997, 1996 and 1995, $99,273, $86,796 and $135,387,
respectively, for fund accounting services for the Portfolio.
 
  Under the terms of a Transfer Agency and Service Agreement, dated September
16, 1994, as amended, between the Trust and A I M Institutional Fund Services,
Inc. ("AIFS"), a registered transfer agent and wholly owned subsidiary of AIM,
as well as under previous agreements, AIFS received $414,190, $256,535 and
$114,179, for the fiscal years ended August 31, 1997, 1996 and 1995
respectively, for the provision of certain shareholder services for the
Portfolio.
 
                                     A-10
<PAGE>   28
 
EXPENSES
 
  In addition to fees paid to AIM pursuant to the Agreement and the expenses
reimbursed to AIM under the Administrative Services Agreement, the Trust also
pays or causes to be paid all other expenses of the Trust, including, without
limitation: the charges and expenses of any registrar, any custodian or
depository appointed by the Trust for the safekeeping of its cash, portfolio
securities and other property, and any transfer, dividend or accounting agent or
agents appointed by the Trust; brokers' commissions chargeable to the Trust in
connection with portfolio securities transactions to which the Trust is a party;
all taxes, including securities issuance and transfer taxes, and fees payable by
the Trust to federal, state or other governmental agencies; the costs and
expenses of engraving or printing of certificates representing shares of the
Trust; all costs and expenses in connection with the registration and
maintenance of registration of the Trust and its shares with the SEC and various
states and other jurisdictions (including filing and legal fees and
disbursements of counsel); the costs and expenses of printing, including
typesetting, and distributing prospectuses and statements of additional
information of the Trust and supplements thereto to the Trust's shareholders;
all expenses of shareholders' and trustees' meetings and of preparing, printing
and mailing of prospectuses, proxy statements and reports to shareholders; fees
and travel expenses of trustees and trustee members of any advisory board or
committee; all expenses incident to the payment of any dividend, distribution,
withdrawal or redemption, whether in shares or in cash; charges and expenses of
any outside service used for pricing of the Trust's shares; charges and expenses
of legal counsel, including counsel to the trustees of the Trust who are not
"interested persons" (as defined in the 1940 Act) of the Trust or AIM, and of
independent accountants in connection with any matter relating to the Trust;
membership dues of industry associations; interest payable on Trust borrowings;
postage; insurance premiums on property or personnel (including officers and
trustees) of the Trust which inure to its benefit; and extraordinary expenses
(including, but not limited to, legal claims and liabilities and litigation
costs and any indemnification related thereto). FMC bears the expenses of
printing and distributing prospectuses and statements of additional information
(other than those prospectuses and statements of additional information
distributed to existing shareholders of the Trust) and any other promotional or
sales literature used by FMC or furnished by FMC to purchasers or dealers in
connection with the public offering of the Trust's shares.
 
  Expenses of the Trust which are not directly attributable to the operations of
any class of shares or portfolio of the Trust are prorated among all classes of
the Trust. Expenses of the Trust except those listed in the next sentence are
prorated among all classes of such Portfolio. Expenses of the Trust which are
directly attributable to a specific class of shares are charged against the
income available for distribution as dividends to the holders of such shares.
 
BANKING REGULATIONS
 
  The Glass-Steagall Act and other applicable laws, among other things,
generally prohibit federally chartered or supervised banks from engaging in the
business of underwriting, selling or distributing securities, but permit banks
to make shares of mutual funds available to their customers and to perform
administrative and shareholder servicing functions. However, judicial or
administrative decisions or interpretations of such laws, as well as changes in
either federal or state statutes or regulations relating to the permissible
activities of banks or their subsidiaries or affiliates, could prevent a bank
from continuing to perform all or a part of its servicing activities. If a bank
were prohibited from so acting, shareholder clients of such bank would be
permitted to remain shareholders of the Trust and alternate means for continuing
the servicing of such shareholders would be sought. In such event, changes in
the operation of the Trust might occur and shareholders serviced by such bank
might no longer be able to avail themselves of any automatic investment or other
services then being provided by such bank. It is not expected that shareholders
would suffer any adverse financial consequences as a result of any of these
occurrences. In addition, state securities laws on this issue may differ from
the interpretations of federal law expressed herein and certain banks and
financial institutions may be required to register as dealers pursuant to state
law.
 
TRANSFER AGENT AND CUSTODIAN
 
  The Bank of New York ("BONY") acts as custodian for the portfolio securities
and cash of the Portfolio. BONY receives such compensation from the Trust for
its services in such capacity as is agreed to from time to time by BONY and the
Trust. The address of BONY is 90 Washington Street, 11th Floor, New York, New
York 10286.
 
  A I M Institutional Fund Services, Inc., 11 Greenway Plaza, Suite 100,
Houston, Texas 77046-1173, acts as transfer agent for the shares of each class
of the Portfolio and receives an annual fee from the Trust for its services in
such capacity in the amount of .009% of average daily net assets of the Trust,
payable monthly. Such compensation may be changed from time to time as is agreed
to by A I M Institutional Fund Services, Inc. and 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 Fund.
 
                                     A-11
<PAGE>   29
 
REPORTS
 
  The Trust furnishes shareholders with semi-annual reports containing
information about the Trust and its operations, including a schedule of
investments held in the Portfolio and its financial statements. The annual
financial statements are audited by the Trust's independent auditors. The Board
of Trustees has selected KPMG Peat Marwick LLP, 700 Louisiana, Houston, Texas
77002, as the independent auditors to audit the financial statements and review
the tax returns of the Portfolio.
 
FEE WAIVERS
 
  AIM or its affiliates may, from time to time, agree to waive voluntarily all
or any portion of its fees or reimburse the Portfolio for certain of its
expenses. Such waivers or reimbursements may be discontinued at any time.
 
PRINCIPAL HOLDERS OF SECURITIES
 
TREASURY PORTFOLIO
 
  To the best of the knowledge of the Trust, the names and addresses of the
holders of 5% or more of the outstanding shares of any class of the Portfolio as
of December 1, 1997, and the percentage of such shares owned by such
shareholders as of such date are as follows:
 
CASH MANAGEMENT CLASS
 
<TABLE>
<CAPTION>
                                                                PERCENT
                      NAME AND ADDRESS                          OWNED OF
                      OF RECORD OWNER                         RECORD ONLY(a)
                      ----------------                        --------------
<S>                                                           <C>
  The Bank of New York......................................      48.53%(b)
    4 Fisher lane
    White Plains, NY 10603
  Fund Services Associates..................................       19.16%
    11835 West Olympic Boulevard
    Suite 205
    Los Angeles, CA 90064
  Texas Commerce Bank.......................................       12.25%
    Mutual Fund Unit/16 Hcb 09
    P.O. Box 2558
    Houston, TX 77252-2558
  Cullen/Frost Discount Brokers.............................        5.27%
    100 W. Houston St.
    San Antonio, TX 78205
</TABLE>
 
 INSTITUTIONAL CLASS
 
<TABLE>
<CAPTION>
                                                                PERCENT
                      NAME AND ADDRESS                          OWNED OF
                      OF RECORD OWNER                         RECORD ONLY(a)
                      ----------------                        --------------
<S>                                                           <C>
  U.S. Bank of  Washington..................................       11.39%
    P.O. Box 3168
    Portland, OR 97208
  Trust Company Bank........................................        9.66%
    P.O. Box 105504
    Atlanta, GA 30348
  City of New York Deferred Compensation Plan...............        7.34%
    40 Rector Street, 3rd Floor
    New York, NY 10006
  Liberty Registration Co. of Oklahoma......................        7.08%
    P.O. Box 25848
    Oklahoma City, OK 73125
</TABLE>

- ---------------
(a) The Trust has no knowledge as to whether all or any portion of the shares
    owned of record only are also owned beneficially.
 
(b) A shareholder who holds more than 25% of the outstanding shares of a class
    may be presumed to be in "control" of such class of shares, as defined in 
    the 1940 Act.
 

 
                                     A-12
<PAGE>   30
 
PERSONAL INVESTMENT CLASS
 
<TABLE>
<CAPTION>
                                                                                       PERCENT
                              NAME AND ADDRESS                                         OWNED OF
                               OF RECORD OWNER                                       RECORD ONLY(a)
                              ----------------                                       ------------
<S>                                                                  <C>             <C>
Cullen/Frost Discount Brokers................................................            66.08%(b)
    P.O. Box 2358
    San Antonio, TX 78299
  The Bank of New York.......................................................            27.42%(b)
    4 Fisher Lane
    White Plains, NY 10603
</TABLE>
 
PRIVATE INVESTMENT CLASS
 
<TABLE>
<CAPTION>
                                                                                       PERCENT
                              NAME AND ADDRESS                                         OWNED OF
                               OF RECORD OWNER                                       RECORD ONLY(a)
                              ----------------                                       ------------
<S>                                                                  <C>             <C>
Liberty Bank and Trust Co. of Tulsa, N.A. ...................................            50.06%(b)
    P.O. Box 25848
    Oklahoma City, OK 73125
  The Bank of New York.......................................................             13.89%
    4 Fisher Lane
    White Plains, NY 10603
  Huntington Capital Corp....................................................             12.29%
    41 S. High St., 9th Floor
    Columbus, Ohio 43287
  First Trust/VAR & Co.......................................................              5.73%
    Funds Control Suite 0404
    180 E. 5th Street
    St. Paul, MN 55101
</TABLE>
 
RESOURCE CLASS
 
<TABLE>
<CAPTION>
                                                                                      PERCENT
                              NAME AND ADDRESS                                        OWNED OF
                              OF RECORD OWNER                                       RECORD ONLY(a)
                              ----------------                                      ------------
<S>                                                                 <C>             <C>
Corestates Capital Markets..................................................             80.37%(b)
    1345 Chestnut Street
    Philadelphia, PA 19101
  Mellon Bank...............................................................              16.37%
    Three Mellon Center, Room 3840
    Pittsburgh, PA 15259-0001
</TABLE>
 
- ---------------
(a) The Trust has no knowledge as to whether all or any portion of the shares
  owned of record only are also owned beneficially.
 

(b) A shareholder who holds more than 25% of the outstanding shares of a class
  may be presumed to be in "control" of such class of shares, as defined in the
  1940 Act.
 
                                     A-13
<PAGE>   31
 
TREASURY TAXADVANTAGE PORTFOLIO
 
  To the best of the knowledge of the Trust, the names and addresses of the
holders of 5% or more of the outstanding shares of any class of the Treasury
TaxAdvantage Portfolio as of December 1, 1997, and the percentage of such shares
owned by such shareholders as of such date are as follows:
INSTITUTIONAL CLASS
 
<TABLE>
<CAPTION>
                                                                                   PERCENT
                            NAME AND ADDRESS                                       OWNED OF
                             OF RECORD OWNER                                     RECORD ONLY(a)
                            ----------------                                     ------------
<S>                                                                              <C>
Peoples Two Ten Company..................................................             33.84%(b)
     c/o Summit Bank
     Trust Operations, 7th Floor
     P.O. Box 821
     Hackensack, NJ 07602
  First Trust/VAR & Co. .................................................             26.57%(b)
     Funds Control Suite 0404
     180 East 5th Street
     St. Paul, MN 55101
  Liberty Registration Co. of Oklahoma...................................             17.14%
     P.O. Box 25848
     Oklahoma City, OK 73125
  NationsBank............................................................              5.16%
     1401 Elm Street, 11th Floor
     P.O. Box 831000
     Dallas, TX 75202-2911
</TABLE>
 
PRIVATE INVESTMENT CLASS
 
<TABLE>
<CAPTION>
                                                                                 PERCENT
                           NAME AND ADDRESS                                      OWNED OF
                            OF RECORD OWNER                                    RECORD ONLY(a)
                           ----------------                                    ------------
<S>                                                                            <C>
The Bank of New York...................................................             37.29%(b)
     4 Fisher Lane
     White Plains, NY 10603
  Huntington Capital Corp..............................................             27.31%(b)
     41 S. High St., 9th Floor
     Columbus, OH 43287
  First National Bank of Chicago.......................................             25.49%(b)
     Mail Suite 0126
     Chicago, IL 60670-0126
  Corestates Capital Markets...........................................              7.74%
     1345 Chestnut St.
     FC 1-1-9-49
     Philadelphia, PA 19101
</TABLE>
 
- ---------------
(a) The Trust has no knowledge as to whether all or any portion of the shares
    owned of record only are also owned beneficially.
 
(b) A shareholder who holds more than 25% of the outstanding shares of a
    class may be presumed to be in "control" of such class of shares, as defined
    in the 1940 Act.
 
  Shares shown as beneficially owned by the above institutions are those shares
for which the institutions possessed or shared voting or investment power with
respect to such shares on behalf of their underlying accounts.
 
  To the best of the knowledge of the Trust, as of December 1, 1997, the
trustees and officers of the Trust beneficially owned less than 1% of each class
of the Trust's outstanding shares.
 
                           PURCHASES AND REDEMPTIONS
 
  A complete description of the manner by which shares of a particular class
may be purchased, redeemed or exchanged appears in the Prospectus under the
heading "Purchase of Shares."
 
  The right of redemption may be suspended or the date of payment postponed when
(a) trading on the New York Stock Exchange ("NYSE") is restricted, as determined
by applicable rules and regulations of the SEC, (b) the NYSE is closed for other
 
                                     A-14
<PAGE>   32
 
than customary weekend and holiday closings, (c) the SEC has by order permitted
such suspension, or (d) an emergency as determined by the SEC exists making
disposition of portfolio securities or the valuation of the net assets of the
Fund not reasonably practicable.
 
  A "business day" of the Portfolio is any day on which commercial banks in the
New York Federal Reserve district 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 on any day when
the U.S. primary broker-dealer community is closed for business or trading is
restricted due to national holidays.
 
NET ASSET VALUE DETERMINATION
 
  Shares of the Portfolio are sold at net asset value. Shareholders may at any
time redeem all or a portion of their shares at net asset value. The investor's
price for purchases and redemptions will be the net asset value next determined
following the receipt of an order to purchase or a request to redeem shares.
 
  The valuation of the portfolio instruments based upon their amortized cost and
the concomitant maintenance of the net asset value per share of $1.00 for the
Portfolio is permitted in accordance with applicable rules and regulations of
the SEC, including Rule 2a-7, which require the Trust to adhere to certain
conditions. These rules require that the Trust maintain a dollar-weighted
average portfolio maturity of 90 days or less for the Portfolio, purchase only
instruments having remaining maturities of 397 days or less and invest only in
securities determined by the Trust's Board of Trustees to be of high quality
with minimal credit risk.
 
  The Board of Trustees is required to establish procedures designed to
stabilize, to the extent reasonably practicable, the Trust's price per share at
$1.00 for the Portfolio as computed for the purpose of sales and redemptions.
Such procedures include review of the Portfolio's portfolio holdings by the
Board of Trustees, at such intervals as they may deem appropriate, to determine
whether the net asset value calculated by using available market quotations or
other reputable sources for the Portfolio deviates from $1.00 per share and, if
so, whether such deviation may result in material dilution or is otherwise
unfair to existing holders of the Portfolio's shares. In the event the Board of
Trustees determines that such a deviation exists for the Portfolio, it will take
such corrective action as the Board of Trustees deems necessary and appropriate
with respect to the Portfolio, including the sales of portfolio instruments
prior to maturity to realize capital gains or losses or to shorten the average
portfolio maturity; the withholding of dividends; redemption of shares in kind;
or the establishment of a net asset value per share by using available market
quotations.
 
DISTRIBUTION AGREEMENT
 
  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 each class of the Portfolio. The address of FMC is
11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173. See "General
Information About the Trust -- Trustees and Officers" and "-- Investment
Advisor" for information as to the affiliation of certain trustees and officers
of the Trust with FMC, AIM and AIM Management.
 
  The Distribution Agreement provides that FMC has the exclusive right to
distribute shares of each class of the Portfolio either directly or through
other broker-dealers. The Distribution Agreement also provides that FMC will pay
promotional expenses, including the incremental costs of printing prospectuses
and statements of additional information, annual reports and other periodic
reports for distribution to persons who are not shareholders of the Trust and
the costs of preparing and distributing any other supplemental sales literature.
FMC has not undertaken to sell any specified number of shares of the Portfolio.
 
  The Distribution Agreement will remain in effect until February 28, 1999, and
it will continue in effect from year to year thereafter only if such
continuation is specifically approved at least annually by the Trust's Board of
Trustees and the affirmative vote of the trustees who are not parties to the
Distribution Agreement or "interested persons" of any such party by votes cast
in person at a meeting called for such purpose. A prior distribution agreement
between the Trust and FMC, with terms substantially the same as those of the
Distribution Agreement was in effect through October 15, 1993. The Trust or FMC
may terminate the Distribution Agreement on 60 days' written notice without
penalty. The Distribution Agreement will terminate automatically in the event of
its "assignment," as defined in the 1940 Act.
 
DISTRIBUTION PLAN
 
  The Trust has adopted a Master Distribution Plan (the "Plan") pursuant to Rule
12b-1 under the 1940 Act. Pursuant to the Plan, the Trust may enter into
Shareholder Service Agreements ("Service Agreements") with selected
broker-dealers, banks, other financial institutions or their affiliates. Such
firms may receive from the Portfolio compensation for servicing investors as
beneficial owners of the shares of the Cash Management Class, Personal
Investment Class, Private Investment Class and Resource Class of the Portfolio.
These services may include among other things: (i) answering customer inquiries
regarding the shares of the class and the Portfolio; (ii) assisting customers in
changing dividend options, account designations and ad-
 
                                     A-15
<PAGE>   33
 
dresses; (iii) performing sub-accounting; (iv) establishing and maintaining
shareholder accounts and records; (v) processing purchase and redemption
transactions; (vi) automatic investment in the shares of the class of customer
cash account balances; (vii) providing periodic statements showing a customer's
account balance and integrating such statements with those of other transactions
and balances in the customer's other accounts serviced by such firm; (viii)
arranging for bank wires; and (ix) such other services as the Trust may request
on behalf of the shares of the class, to the extent such firms are permitted to
engage in such services by applicable statute, rule or regulation. The Plan may
only be used for the purposes specified above and as stated in the Plan.
Expenses may not be carried over from year to year.
 
  For the fiscal year ended August 31, 1997, FMC received compensation pursuant
to the Plan in the amount of $625,057, or an amount equal to 0.08% of the
average daily net assets of the Cash Management Class, $1,210,290, or an amount
equal to 0.50% of the average daily net assets of the Personal Investment Class,
$1,195,700, or an amount equal to 0.30% of the average daily net assets of the
Private Investment Class, and $315,905, or an amount equal to 0.16% of the
average daily net assets of the Resource Class. With respect to the Cash
Management Class, $623,035 of such amount (or an amount equal to 0.08% of the
average daily net assets of the class) was paid to dealers and financial
institutions and $1,879 (or an amount equal to 0% of the average daily net
assets of the class) was retained by FMC. With respect to the Personal
Investment Class, $979,963 of such amount (or an amount equal to 0.40% of the
average daily net assets of the class) was paid to dealers and financial
institutions and $230,044 (or an amount equal to 0.10% of the average daily net
assets of the class) was retained by FMC. With respect to the Private Investment
Class, $1,023,839 of such amount (or an amount equal to 0.26% of the average
daily net assets of the class) was paid to dealers and financial institutions
and $172,395 (or an amount equal to 0.04% of the average daily net assets of the
class) was retained by FMC. With respect to the Resource Class, $315,899 of such
amount (or an amount equal to 0.16% of the average daily net assets of the
class) was paid to dealers and financial institutions and none of such
compensation was retained by FMC.
 
  FMC is a wholly owned subsidiary of AIM, a wholly owned subsidiary of AIM
Management. Charles T. Bauer, a Trustee and Chairman of the Trust, owns shares
of AIM Management and Robert H. Graham, a Trustee and President of the Trust,
also owns shares of AIM Management.
 
PERFORMANCE INFORMATION
 
  As stated under the caption "Yield Information" in the Prospectus, yield
information for the shares of each class of the Portfolio may be obtained by
calling the Trust at (800) 659-1005. The current yield quoted will be the net
average annualized yield for an identified period, such as seven days or a
month. Current yield will be computed by assuming that an account was
established with a single share (the "Single Share Account") on the first day of
the period. To arrive at the quoted yield, the net change in the value of that
Single Share Account for the period (which would include dividends accrued with
respect to the share, and dividends declared on shares purchased with dividends
accrued and paid, if any, but would not include realized gains and losses or
unrealized appreciation or depreciation) will be multiplied by 365 and then
divided by the number of days in the period, with the resulting figure carried
to the nearest hundredth of one percent. The Trust may also furnish a quotation
of effective yield that assumes the reinvestment of dividends for a 365-day year
and a return for the entire year equal to the average annualized yield for the
period, which will be computed by compounding the unannualized current yield for
the period by adding 1 to the unannualized current yield, raising the sum to a
power equal to 365 divided by the number of days in the period, and then
subtracting 1 from the result.
 
  For the seven-day period ended August 31, 1997, the current yield and the
effective yield (which assumes the reinvestment of dividends for a 365-day year
and a return for the entire year equal to the annualized current yield for the
period) were 5.49% and 5.64%, for the Cash Management Class, were 5.57% and
5.72%, for the Institutional Class, were 5.07% and 5.20%, for the Personal
Investment Class, were 5.27% and 5.41%, for the Private Investment Class and
were 5.41% and 5.56%, for the Resource Class respectively. These yields are
quoted for illustration purposes only. The yields for any other seven-day period
may be substantially different from the yields quoted above.
 
  The Trust may compare the performance of a class or the performance of
securities in which it may invest to:
 
          - IBC/Donoghue's Money Fund Averages, which are average yields of
     various types of money market funds that include the effect of compounding
     distributions;
 
          - other mutual funds, especially those with similar investment
     objectives. These comparisons may be based on data published by
     IBC/Donoghue's Money Fund Report of Holliston, Massachusetts or by Lipper
     Analytical Services, Inc., a widely recognized independent service located
     in Summit, New Jersey, which monitors the performance of mutual funds;
 
          - yields on other money market securities or averages of other money
     market securities as reported by the Federal Reserve Bulletin, by TeleRate,
     a financial information network, or by Bloomberg, a financial information
     firm; and
 
          - other fixed-income investments such as Certificates of Deposit
     ("CDs").
 
                                     A-16
<PAGE>   34
 
  The principal value and interest rate of CDs and money market securities are
fixed at the time of purchase whereas a class's yield will fluctuate. Unlike
some CDs and certain other money market securities, money market mutual funds
are not insured by the FDIC. Investors should give consideration to the quality
and maturity of the portfolio securities of the respective investment companies
when comparing investment alternatives.
 
  The Trust may reference the growth and variety of money market mutual funds
and AIM's innovation and participation in the industry.
 
                      INVESTMENT PROGRAM AND RESTRICTIONS
 
INVESTMENT PROGRAM
 
  The Portfolio seeks to achieve its objective by investing in high grade money
market instruments. 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 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 enter into repurchase agreements with respect
to U.S. Treasury securities. The Portfolio may also 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 repurchase agreement. The Portfolio will only borrow money or
enter into reverse repurchase agreements for temporary or emergency purposes to
facilitate the orderly sale of portfolio securities to accommodate abnormally
heavy redemption requests should they occur.
 
ELIGIBLE SECURITIES
 
  The Trust will invest in "Eligible Securities" as defined in Rule 2a-7 under
the 1940 Act, which the Trust's Board of Trustees has determined to present
minimal credit risk.
 
INVESTMENT RESTRICTIONS
 
  As a matter of fundamental policy which may not be changed without a majority
vote of shareholders of the Portfolio (as that term is defined under "General
Information about the Trust -- The Trust and its Shares"), the Portfolio may
not:
 
          (1) concentrate more than 25% of the value of its total assets in the
     securities of one or more issuers conducting their principal business
     activities in the same industry, provided that there is no limitation with
     respect to investments in obligations issued or guaranteed by the U.S.
     Government, its agencies or instrumentalities and bank instruments, such as
     CDs, bankers' acceptances, time deposits and bank repurchase agreements;
 
          (2) 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 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; or
 
          (3) 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 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,
     provided that the Portfolio will not purchase portfolio securities while
     borrowings in excess of 5% of its total assets are outstanding;
 
          (4) mortgage, pledge or hypothecate any assets except to secure
     permitted borrowings and except for reverse repurchase agreements and then
     only in an amount up to 33-1/3% of the value of its total assets at the
     time of borrowing or entering into a reverse repurchase agreement;
 
          (5) make loans of money or securities other than (a) through the
     purchase of debt securities in accordance with the Portfolio's investment
     program, (b) by entering into repurchase agreements and (c) by lending
     portfolio securities to the extent permitted by law or regulation;
 
          (6) underwrite securities issued by any other person, except to the
     extent that the purchase of securities and the later disposition of such
     securities in accordance with the Portfolio's investment program may be
     deemed an underwriting;
 
          (7) invest in real estate, except that the Portfolio may purchase and
     sell securities secured by real estate or interests therein or issued by
     issuers which invest in real estate or interests therein;
 
                                     A-17
<PAGE>   35

 
          (8) purchase or sell commodities or commodity futures contracts,
     purchase securities on margin, make short sales or invest in puts or
     calls; or
 
          (9) invest in any obligation not payable as to principal and interest
     in United States currency. 
 
OTHER INVESTMENT POLICIES
 
  The Portfolio does not intend to invest in companies for the purpose of
exercising control or management, except that the Portfolio may purchase
securities of other investment companies to the extent permitted by applicable
law or exemptive order.  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. None of the foregoing policies is fundamental.
 
                             PORTFOLIO TRANSACTIONS
 
  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 commission
paid by the issuer to the underwriter.
 
  The Portfolio does not seek to profit from short-term trading, and will
generally (but not always) 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 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. The amortized cost method of valuing portfolio securities requires
that the Portfolio maintain an average weighted portfolio maturity of ninety
days or less. Thus, there is likely to be relatively high portfolio turnover,
but since brokerage commissions are not normally paid on money market
instruments, the high rate of portfolio turnover is not expected to have a
material effect on the net income or expenses of the Portfolio.
 
  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 execution 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 program. Research services
received from broker-dealers supplement AIM's own research (and the research of
sub-advisors to other clients of AIM), and may include the following types of
information: statistical and background information on the U.S. and foreign
economies, industry groups and individual companies; forecasts and
interpretations with respect to U.S. and foreign economies, securities, markets,
specific industry groups and individual companies; information on federal,
state, local and foreign political developments; portfolio management
strategies, performance information on securities, indexes and investment
accounts; information concerning prices of securities; and information supplied
by specialized services to AIM and to the Trust's trustees with respect to the
performance, investment activities and fees and expenses of other mutual funds.
Such information may be communicated electronically, orally or in written form.
Research services may also include the providing of equipment used to
communicate research information, the providing of specialized consultations
with AIM personnel with respect to computerized systems and data furnished to
AIM as a component of other research services, the arranging of meetings with
management of companies and the providing of access to consultants who supply
research information. Certain research services furnished by dealers may be
useful to AIM with respect to clients 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. AIM is of the opinion that the material received is beneficial in
supplementing AIM's research and analysis; and, therefore, it may benefit the
Portfolio by improving the quality of AIM's investment advice. The advisory fees
paid by the Portfolio are not reduced because AIM receives such services.
 
  From time to time, the Trust may sell a security, or purchase a security from
an AIM Fund or another investment account advised by AIM or A I M Capital
Management, Inc. ("AIM Capital"), when such transactions comply with applicable
rules and regulations and are deemed consistent with the investment objective(s)
and policies of the investment accounts advised by AIM or AIM Capital.
Procedures pursuant to Rule 17a-7 under the 1940 Act regarding transactions
between investment accounts advised by AIM or AIM Capital have been adopted by
the Boards of Directors/Trustees of the various AIM Funds, including the Trust.
Although such transactions may result in custodian, tax or other related
expenses, no brokerage commissions or other direct transaction costs are
generated by transactions among the investment accounts advised by AIM or AIM
Capital.
 

 
                                     A-18
<PAGE>   36
  Provisions of the 1940 Act and rules and regulations thereunder have been
construed to prohibit the Trust from purchasing securities or instruments from,
or selling securities or instruments to, any holder of 5% or more of the voting
securities of any investment company managed or advised by AIM. The Trust has
obtained an order of exemption from the SEC which permits the Trust to engage in
certain transactions with certain 5% holders, if the Trust complies with
conditions and procedures designed to ensure that such transactions are executed
at fair market value and present no conflicts of interest.
 
  AIM and its affiliates manage several other investment accounts, some of which
may have objectives similar to the Portfolio's. It is possible that at times
identical securities will be acceptable for one or more of such investment
accounts. However, the position of each account in the securities of the same
issue may vary and the length of time that each account may choose to hold its
investment in the securities of the same issue may likewise vary. The timing and
amount of purchase by each account will also be determined by its cash position.
If the purchase or sale of securities is consistent with the investment policies
of the Portfolio and one or more of these accounts and is considered at or about
the same time, transactions in such securities will be allocated in good faith
among such accounts, in accordance with applicable laws and regulations, in
order to obtain the best net price and most favorable execution. The allocation
and combination of simultaneous securities purchases on behalf of the Portfolio
will be made in the same way that such purchases are allocated among or combined
with those of other AIM accounts. Simultaneous transactions could adversely
affect the ability of the Portfolio to obtain or dispose of the full amount of a
security which it seeks to purchase or sell.
 
  Under the 1940 Act, certain persons affiliated with the Trust are prohibited
from dealing with the Portfolios as principal in any purchase or sale of
securities unless an exemptive order allowing such transactions is obtained from
the SEC. Furthermore, the 1940 Act prohibits the Trust from purchasing a
security being publicly underwritten by a syndicate of which certain persons
affiliated with the Trust are members except in accordance with certain
conditions. These conditions may restrict the ability of the Portfolio to
purchase money market obligations being publicly underwritten by such a
syndicate, and the Portfolio may be required to wait until the syndicate has
been terminated before buying such securities. At such time, the market price of
the securities may be higher or lower than the original offering price. A person
affiliated with the Trust may, from time to time, serve as placement agent or
financial advisor to an issuer of money market obligations and be paid a fee by
such issuer. The Portfolio may purchase such money market obligations directly
from the issuer, provided that the purchase made in accordance with procedures
adopted by the Trust's Board of Trustees and any such purchases are reviewed at
least quarterly by the Trust's Board of Trustees and a determination is made
that all such purchases were effected in compliance with such procedures,
including a determination that the placement fee or other remuneration paid by
the issuer to the person affiliated with the Trust was fair and reasonable in
relation to the fees charged by others performing similar services. During the
fiscal year ended August 31, 1997, no securities or instruments were purchased
by the Portfolio from issuers who paid placement fees or other compensation to a
broker affiliated with the Portfolio.
 
                                  TAX MATTERS
 
  The following is only a summary of certain additional tax considerations
generally affecting the Portfolio and its shareholders that are not described in
the Prospectus. No attempt is made to present a detailed explanation of the tax
treatment of the Portfolio or its shareholders, and the discussion here and in
the Prospectus is not intended as a substitute for careful tax planning.
 
QUALIFICATION AS A REGULATED INVESTMENT COMPANY
 
  The Portfolio has elected to be taxed as a regulated investment company under
Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"). As a
regulated investment company, the Portfolio is not subject to federal income tax
on the portion of its net investment income (i.e., taxable interest, dividends
and other taxable ordinary income, net of expenses) and capital gain net income
(i.e., the excess of capital gains over capital losses) that it distributes to
shareholders, provided that it distributes at least 90% of its investment
company taxable income (i.e., net investment income and the excess of net
short-term capital gain over net long-term capital loss) for the taxable year
(the "Distribution Requirement"), and satisfies certain other requirements of
the Code that are described below. Distributions by the Portfolio made during
the taxable year or, under specified circumstances, within twelve months after
the close of the taxable year, will be considered distributions of income and
gains for the taxable year and can therefore satisfy the Distribution
Requirement.
 
  In addition to satisfying the Distribution Requirement, a regulated investment
company (1) must derive at least 90% of its gross income from dividends,
interest, certain payments with respect to securities loans, gains from the sale
or other disposition of stock or securities or foreign currencies (to the extent
such currency gains are directly related to the regulated investment company's
principal business of investing in stock or securities) and other income
(including but not limited to gains from options, futures or forward contracts)
derived with respect to its business of investing in such stock, securities or
currencies (the "Income Requirement"); and (2) must satisfy an asset
diversification test in order to qualify for tax purposes as a regulated
investment company (the "Asset Diversification Test"). Under the Asset
Diversification Test, at the close of each quarter of a fund's taxable year, at
least 50% of the value of a fund's assets must consist of cash and cash items,
U.S. Govern-
 
                                      A-19
<PAGE>   37
ment securities, securities of other regulated investment companies, and
securities of other issuers (as to which a fund has not invested more than 5% of
the value of a fund's total assets in securities of such issuer and as to which
a fund does not hold more than 10% of the outstanding voting securities of such
issuer), and no more than 25% of the value of its total assets may be invested
in the securities of any other issuer (other than U.S. Government securities and
securities of other regulated investment companies), or in two or more issuers
which a fund controls and which are engaged in the same or similar trades or
businesses.
 
  If, for any taxable year the Portfolio does not qualify as a regulated
investment company, all of its taxable income (including its net capital gain)
will be subject to tax at regular corporate rates without any deduction for
distributions to shareholders, and such distributions will be taxable as
ordinary dividends to the extent of the Portfolio's current and accumulated
earnings and profits. Such distributions generally will be eligible for the
dividends received deduction in the case of corporate shareholders.
 
EXCISE TAX ON REGULATED INVESTMENT COMPANIES
 
  A 4% non-deductible excise tax is imposed on a regulated investment company
that fails to distribute in each calendar year an amount equal to 98% of
ordinary taxable income for the calendar year and 98% of capital gain net income
for the one-year period ended on October 31 of such calendar year (or, at the
election of a regulated investment company having a taxable year ending November
30 or December 31, for its taxable year( a "taxable year election")). The
balance of such income must be distributed during the next calendar year. For
the foregoing purposes, a regulated investment company is treated as having
distributed any amount on which it is subject to income tax for any taxable year
ending in such calendar year.
 
  The Portfolio intends to make sufficient distributions or deemed distributions
of its ordinary taxable income and capital gain net income prior to the end of
each calendar year to avoid liability for the excise tax. However, investors
should note that the Portfolio may in certain circumstances be required to
liquidate portfolio investments to make sufficient distributions to avoid excise
tax liability.
 
PORTFOLIO DISTRIBUTIONS
 
  The Portfolio anticipates distributing substantially all of its investment
company taxable income for each taxable year. Such distributions will be taxable
to shareholders as ordinary income and treated as dividends for federal income
tax purposes, but they will not qualify for the 70% dividends received deduction
for corporations.
 
  Distributions by the Portfolio will be treated in the manner described above
regardless of whether such distributions are paid in cash or reinvested in
additional shares of the Portfolio. Shareholders receiving a distribution in the
form of additional shares will be treated as receiving a distribution in an
amount equal to the fair market value of the shares received, determined as of
the reinvestment date.
 
  Ordinarily, shareholders are required to take distributions by the Portfolio
into account in the year in which the distributions are made. However, dividends
declared in October, November or December of any year and payable to
shareholders of record on a specified date in such a month will be deemed to
have been received by the shareholders (and made by the Portfolio) on December
31 of such calendar year if such dividends are actually paid in January of the
following year. Shareholders will be advised annually as to the U.S. federal
income tax consequences of distributions made (or deemed made) during the year
in accordance with the guidance that has been provided by the Internal Revenue
Service.
 
  The Portfolio will be required in certain cases to withhold and remit to the
U.S. Treasury 31% of the ordinary income dividends and capital gain dividends,
and in certain cases, of the proceeds of redemption of shares, paid to any
shareholder (1) who has provided either an incorrect tax identification number
or no number at all, (2) who is subject to backup withholding by the Internal
Revenue Service for failure to report the receipt of interest or dividend income
properly, or (3) who has failed to certify to the Trust that it is not subject
to backup withholding or that it is a corporation or other "exempt recipient."
 
SALE OR REDEMPTION OF SHARES
 
  A shareholder will recognize gain or loss on the sale or redemption of shares
of a class in an amount equal to the difference between the proceeds of the sale
or redemption and the shareholder's adjusted tax basis in the shares. All or a
portion of any loss so recognized may be disallowed if the shareholder purchases
other shares of the class within 30 days before or after the sale or redemption.
In general, any gain or loss arising from (or treated as arising from) the sale
or redemption of shares of a class will be considered capital gain or loss and
will be long-term capital gain or loss if the shares were held for longer than
one year. However, any capital loss arising from the sale or redemption of
shares held for six months or less will be treated as a long-term capital loss
to the extent of the amount of capital gain dividends received on such shares.
For this purpose, the special holding period rules of Code Section 246(c)(3) and
(4) generally will apply in determining the holding period of shares.
 
                                      A-20
<PAGE>   38
FOREIGN SHAREHOLDERS
 
  Taxation of a shareholder who, as to the United States, is a nonresident alien
individual, foreign trust or estate, foreign corporation, or foreign partnership
("foreign shareholder"), depends on whether the income from the Portfolio is
"effectively connected" with a U.S. trade or business carried on by such
shareholder.
 
  If the income from the Portfolio is not effectively connected with a U.S.
trade or business carried on by a foreign shareholder, dividends and
distributions (other than capital gains dividends) will be subject to U.S.
withholding tax at the rate of 30% (or lower treaty rate) upon the gross amount
of the dividend or distribution. Such a foreign shareholder would generally be
exempt from U.S. federal income tax on gains realized on the sale of shares of a
class, capital gain dividends and amounts retained by the Portfolio that are
designated as undistributed capital gains.
 
  If the income from the Portfolio is effectively connected with a U.S. trade or
business carried on by a foreign shareholder, then ordinary income dividends,
capital gain dividends and any gains realized upon the sale of shares of the
Portfolio will be subject to U.S. federal income tax at the rates applicable to
U.S. citizens or domestic corporations.
 
  In the case of foreign noncorporate shareholders, the Portfolio may be
required to withhold U.S. federal income tax at a rate of 31% on distributions
that are otherwise exempt from withholding tax unless such shareholders furnish
the Portfolio with proper notification of their foreign status.
 
  The tax consequences to a foreign shareholder entitled to claim the benefits
of an applicable tax treaty may be different from those described herein.
Foreign shareholders are urged to consult their own tax advisers with respect to
the particular tax consequences to them of an investment in the Portfolio,
including the applicability of foreign taxes.
 
EFFECT OF FUTURE LEGISLATION; LOCAL TAX CONSIDERATIONS
 
  The foregoing general discussion of U.S. federal income tax consequences is
based on the Code and the regulations issued thereunder as in effect on December
17, 1997. Future legislative or administrative changes or court decisions may
significantly change the conclusions expressed herein, and any such changes or
decisions may have a retroactive effect with respect to the transactions
contemplated herein.
 
  Rules of state and local taxation of ordinary income dividends and capital
gain dividends from regulated investment companies often differ from the rules
for U.S. federal income taxation described above. Shareholders are urged to
consult their tax advisers as to the consequences of these and other state and
local tax rules affecting investment in the Trust.
 
                                      A-21
<PAGE>   39
 
                              FINANCIAL STATEMENTS
 
                                       FS
<PAGE>   40
 
INDEPENDENT AUDITORS' REPORT
 
To the Board of Trustees and Shareholders
Short-Term Investments Trust:
 
We have audited the accompanying statement of assets and liabilities of the
Treasury Portfolio (a series portfolio of Short-Term Investments Trust),
including the schedule of investments, as of August 31, 1997, and the related
statement of operations for the year then ended, the statement of changes in net
assets for each of the years in the two-year period then ended, and the
financial highlights for each of the years in the five-year period then ended.
These financial statements and financial highlights are the responsibility of
the Fund's management. Our responsibility is to express an opinion on these
financial statements and financial highlights based on our audits.
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of
August 31, 1997 by correspondence with the custodian. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
  In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of the
Treasury Portfolio as of August 31, 1997, the results of its operations for the
year then ended, the changes in its net assets for each of the years in the
two-year period then ended, and the financial highlights for each of the years
in the five-year period then ended, in conformity with generally accepted
accounting principles.

                                                       KPMG Peat Marwick LLP
 
Houston, Texas
October 3, 1997
 
                                      FS-1
<PAGE>   41
 
SCHEDULE OF INVESTMENTS
 
August 31, 1997
 
<TABLE>
<CAPTION>
                                                   MATURITY   PAR (000)       VALUE
<S>                                                <C>        <C>         <C>
U.S. TREASURY SECURITIES-12.94%

U.S. TREASURY BILLS(a)-5.80%

5.33%                                              10/02/97   $ 50,000    $   49,770,514
- ----------------------------------------------------------------------------------------
5.325%                                             01/08/98     25,000        24,522,969
- ----------------------------------------------------------------------------------------
5.28%                                              03/05/98     40,000        38,914,667
- ----------------------------------------------------------------------------------------
5.665%                                             04/02/98     25,000        24,162,052
- ----------------------------------------------------------------------------------------
5.53%                                              04/30/98     50,000        48,148,987
- ----------------------------------------------------------------------------------------
5.52%                                              05/28/98     50,000        47,937,667
- ----------------------------------------------------------------------------------------
5.235%                                             06/25/98     25,000        23,920,281
- ----------------------------------------------------------------------------------------
5.215%                                             07/23/98     25,000        23,823,004
- ----------------------------------------------------------------------------------------
5.245%                                             07/23/98     25,000        23,816,233
- ----------------------------------------------------------------------------------------
                                                                             305,016,374
- ----------------------------------------------------------------------------------------

U.S. TREASURY NOTES-7.14%

5.75%                                              09/30/97     50,000        50,012,312
- ----------------------------------------------------------------------------------------
8.75%                                              10/15/97     50,000        50,197,174
- ----------------------------------------------------------------------------------------
5.25%                                              12/31/97     50,000        49,944,119
- ----------------------------------------------------------------------------------------
7.875%                                             01/15/98     75,000        75,554,919
- ----------------------------------------------------------------------------------------
5.125%                                             03/31/98     50,000        49,757,722
- ----------------------------------------------------------------------------------------
5.125%                                             06/30/98     50,000        49,796,720
- ----------------------------------------------------------------------------------------
6.25%                                              06/30/98     25,000        25,133,372
- ----------------------------------------------------------------------------------------
8.25%                                              07/15/98     25,000        25,549,378
- ----------------------------------------------------------------------------------------
                                                                             375,945,716
- ----------------------------------------------------------------------------------------
         Total U.S. Treasury Securities                                      680,962,090
- ----------------------------------------------------------------------------------------
         Total Investments (excluding Repurchase
           Agreements)                                                       680,962,090
- ----------------------------------------------------------------------------------------
REPURCHASE AGREEMENTS-87.34%(b)

BT Securities Corp. 5.55%(c)                       09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

BZW Securities Inc. 5.57%(d)                       09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

Bear, Stearns & Co. Inc.
  5.58%(e)                                              --     200,000       200,000,000
- ----------------------------------------------------------------------------------------
  5.58%(f)                                              --     200,000       200,000,000
- ----------------------------------------------------------------------------------------

CIBC-Wood Gundy Securities Corp. 5.56%(g)          09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

CS First Boston Corp. 5.53%(h)                     09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

Chase Securities, Inc. 5.55%(i)                    09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

Deutsche Morgan Grenfell/C.J. Lawrence, Inc.
  5.58%(j)                                              --     560,000       560,000,000
- ----------------------------------------------------------------------------------------

Goldman, Sachs & Co. 5.56%(k)                      09/02/97    434,729       434,728,794
- ----------------------------------------------------------------------------------------

Greenwich Capital Markets, Inc. 5.57%(l)           09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

HSBC Securities, Inc. 5.58%(m)                     09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------
</TABLE>
 
                                      FS-2
<PAGE>   42
<TABLE>
<CAPTION>
                                                   MATURITY   PAR (000)       VALUE
<S>                                                <C>        <C>         <C>
REPURCHASE AGREEMENTS-(continued)

Merrill Lynch Government Securities Inc. 5.57%(n)  09/02/97   $200,000    $  200,000,000
- ----------------------------------------------------------------------------------------

Morgan (J.P.) Securities Inc. 5.56%(o)             09/02/97    300,000       300,000,000
- ----------------------------------------------------------------------------------------

Morgan Stanley & Co. Inc. 5.58%(p)                 09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

Nesbitt Burns Securities Inc. 5.57%(q)                  --     200,000       200,000,000
- ----------------------------------------------------------------------------------------

SBC Capital Markets Inc. 5.57%(r)                  09/02/97    500,000       500,000,000
- ----------------------------------------------------------------------------------------

Sanwa Securities (USA) Co., L.P. 5.56%(s)          09/02/97    200,000       200,000,000
- ----------------------------------------------------------------------------------------

UBS Securities LLC 5.56%(t)                             --     200,000       200,000,000
- ----------------------------------------------------------------------------------------
         Total Repurchase Agreements                                       4,594,728,794
- ----------------------------------------------------------------------------------------
TOTAL INVESTMENTS-100.28%                                                  5,275,690,884(u)
- ----------------------------------------------------------------------------------------
OTHER ASSETS LESS LIABILITIES-(0.28)%                                        (14,902,379)
- ----------------------------------------------------------------------------------------
NET ASSETS-100.00%                                                        $5,260,788,505
========================================================================================
</TABLE>
 
NOTES TO SCHEDULE OF INVESTMENTS:
 
(a) U.S. Treasury bills are traded on a discount basis. In such cases the
    interest rate shown represents the rate of discount paid or received at the
    time of purchase by the Portfolio.
(b) Collateral on repurchase agreements, including the Portfolio's pro-rata
    interest in joint repurchase agreements, is taken into possession by the
    Portfolio upon entering into the repurchase agreement. The collateral is
    marked to market daily to ensure its market value as being 102% of the sales
    price of the repurchase agreement. The investments in some repurchase
    agreements are through participation in joint accounts with other mutual
    funds, private accounts and certain non-registered investment companies
    managed by the investment advisor or its affiliates.
(c) Entered into 08/29/97 with a maturing value of $200,123,333. Collateralized
    by $163,725,000 U.S. Treasury obligations, 8.875% due 02/15/19 with a market
    value at 08/31/97 of $204,764,696.
(d) Entered into 08/29/97 with a maturing value of $200,123,778. Collateralized
    by $184,335,000 U.S. Treasury obligations, 0% to 11.25% due 12/04/97 to
    02/15/15 with an aggregate market value at 08/31/97 of $204,000,005.
(e) Open repurchase agreement. Either party may terminate the agreement upon
    demand. Interest rates, par and collateral are redetermined daily.
    Collateralized by $821,051,000 U.S. Treasury obligations, 0% to 8.75% due
    11/15/99 to 08/15/25 with an aggregate market value at 08/31/97 of
    $206,717,583.
(f) Open repurchase agreement. Either party may terminate the agreement upon
    demand. Interest rates, par and collateral are redetermined daily.
    Collateralized by $500,628,000 U.S. Treasury obligations, 0% due 02/15/06 to
    11/15/21 with an aggregate market value at 08/31/97 of $204,356,857.
(g) Entered into 08/29/97 with a maturing value of $200,123,556. Collateralized
    by $194,543,000 U.S. Treasury obligations, 5.375% to 11.25% due 08/31/97 to
    11/15/26 with an aggregate market value at 08/31/97 of $204,001,930.
(h) Entered into 08/29/97 with a maturing value of $200,122,889. Collateralized
    by $208,810,000 U.S. Treasury obligations, 0% to 6.25% due 09/04/97 to
    06/30/02 with an aggregate market value at 08/31/97 of $205,012,084.
(i) Entered into 08/29/97 with a maturing value of $200,123,333. Collateralized
    by $193,386,000 U.S. Treasury obligations, 5.50% to 8.875% due 02/15/00 to
    08/15/27 with an aggregate market value at 08/31/97 of $204,004,690.
(j) Open repurchase agreement. Either party may terminate the agreement upon
    demand. Interest rates, par and collateral are redetermined daily.
    Collateralized by $537,574,000 U.S. Treasury obligations 5.25% to 7.875%,
    due 12/31/97 to 11/15/04 with an aggregate market value at 08/31/97 of
    $571,200,459.
(k) Joint repurchase agreement entered into 08/29/97 with a maturing value of
    $750,463,333. Collateralized by $698,212,000 U.S. Treasury obligations,
    4.75% to 14.00% due 02/28/98 to 08/15/25 with an aggregate market value at
    08/31/97 of $765,753,716.
(l) Entered into 08/29/97 with a maturing value of $200,123,778. Collateralized
    by $137,530,000 U.S. Treasury obligations, 11.25% due 02/15/15 with a market
    value at 08/31/97 of $204,003,754.
(m) Entered into 08/29/97 with a maturing value of $200,124,000. Collateralized
    by $209,292,000 U.S. Treasury obligations, 0% due 02/19/98 to 02/26/98 with
    an aggregate market value at 08/31/97 of $204,003,111.
(n) Entered into 08/29/97 with a maturing value of $200,123,778. Collateralized
    by $534,773,000 U.S. Treasury obligations, 0% to 12.00% due 11/15/97 to
    02/15/27 with an aggregate market value at 08/31/97 of $204,002,655.
 
                                      FS-3
<PAGE>   43
 
(o) Entered into 08/29/97 with a maturing value of $300,185,333. Collateralized
    by $293,232,000 U.S. Treasury obligations, 5.625% to 13.25% due 11/15/97 to
    05/15/14 with an aggregate market value at 08/31/97 of $306,000,820.
(p) Entered into 08/29/97 with a maturing value of $200,124,000. Collateralized
    by $192,551,000 U.S. Treasury obligations, 7.00% to 8.75% due 04/15/99 to
    02/15/23 with an aggregate market value at 08/31/97 of $204,014,896.
(q) Open repurchase agreement. Either party may terminate the agreement upon
    demand. Interest rates, par and collateral are redetermined daily.
    Collateralized by $598,149,000 U.S. Treasury obligations, 0% to 6.375% due
    11/15/97 to 11/15/26 with an aggregate market value at 08/31/97 of
    $204,000,427.
(r) Entered into 08/29/97 with a maturing value of $500,309,444. Collateralized
    by $672,387,000 U.S. Treasury obligations, 0% to 6.875% due 11/13/97 to
    08/15/20 with an aggregate market value at 08/31/97 of $511,373,725.
(s) Entered into 08/29/97 with a maturing value of $200,123,556. Collateralized
    by $195,073,000 U.S. Treasury obligations, 4.75% to 11.875% due 11/30/97 to
    11/15/22 with an aggregate market value at 08/31/97 of $204,000,425.
(t) Open repurchase agreement. Either party may terminate the agreement upon
    demand. Interest rates, par and collateral are redetermined daily.
    Collateralized by $196,654,000 U.S. Treasury obligations, 5.50% to 8.75% due
    08/15/00 to 02/28/01 with an aggregate market value at 08/31/97 of
    $204,000,926.
(u) Also represents cost for federal income tax purposes.
 
See Notes to Financial Statements.
 
                                      FS-4
<PAGE>   44
 
STATEMENT OF ASSETS AND LIABILITIES
 
August 31, 1997
 
<TABLE>
<S>                                                           <C>
ASSETS:

Investments, excluding repurchase agreements, at value
  (amortized cost)                                            $  680,962,090
- ----------------------------------------------------------------------------
Repurchase agreements                                          4,594,728,794
- ----------------------------------------------------------------------------
Interest receivable                                                8,635,412
- ----------------------------------------------------------------------------
Investment for deferred compensation plan                             62,529
- ----------------------------------------------------------------------------
Other assets                                                         139,530
- ----------------------------------------------------------------------------
    Total assets                                               5,284,528,355
- ----------------------------------------------------------------------------

LIABILITIES:

Payables for:
  Dividends                                                       22,897,610
- ----------------------------------------------------------------------------
  Deferred compensation                                               62,529
- ----------------------------------------------------------------------------
Accrued advisory fees                                                248,343
- ----------------------------------------------------------------------------
Accrued distribution fees                                            358,768
- ----------------------------------------------------------------------------
Accrued transfer agent fees                                           48,453
- ----------------------------------------------------------------------------
Accrued trustees' fees                                                 5,067
- ----------------------------------------------------------------------------
Accrued administrative services fees                                   8,834
- ----------------------------------------------------------------------------
Accrued operating expenses                                           110,246
- ----------------------------------------------------------------------------
    Total liabilities                                             23,739,850
- ----------------------------------------------------------------------------

NET ASSETS                                                    $5,260,788,505
============================================================================

NET ASSETS:

Institutional Class                                           $3,408,009,911
- ----------------------------------------------------------------------------
Private Investment Class                                      $  463,440,813
- ----------------------------------------------------------------------------
Personal Investment Class                                     $  322,971,027
- ----------------------------------------------------------------------------
Cash Management Class                                         $  829,243,407
- ----------------------------------------------------------------------------
Resource Class                                                $  237,123,347
- ----------------------------------------------------------------------------

SHARES OF BENEFICIAL INTEREST, $.01 PAR VALUE PER SHARE:

Institutional Class                                            3,407,493,098
- ----------------------------------------------------------------------------
Private Investment Class                                         463,369,076
- ----------------------------------------------------------------------------
Personal Investment Class                                        322,922,450
- ----------------------------------------------------------------------------
Cash Management Class                                            829,111,747
- ----------------------------------------------------------------------------
Resource Class                                                   237,087,410
- ----------------------------------------------------------------------------

NET ASSET VALUE PER SHARE:

Net asset value, offering and redemption price per share      $         1.00
============================================================================
</TABLE>
 
See Notes to Financial Statements.
 
                                      FS-5
<PAGE>   45
 
STATEMENT OF OPERATIONS
 
For the year ended August 31, 1997
 
<TABLE>
<S>                                                             <C>
INVESTMENT INCOME:

Interest income                                                 $244,075,766
- ----------------------------------------------------------------------------
EXPENSES:

Advisory fees                                                      2,666,379
- ----------------------------------------------------------------------------
Custodian fees                                                       280,405
- ----------------------------------------------------------------------------
Administrative services fees                                          99,273
- ----------------------------------------------------------------------------
Trustees' fees and expenses                                           32,668
- ----------------------------------------------------------------------------
Transfer agent fees                                                  414,190
- ----------------------------------------------------------------------------
Distribution fees (Note 2)                                         4,984,471
- ----------------------------------------------------------------------------
Other                                                                480,366
- ----------------------------------------------------------------------------
    Total expenses                                                 8,957,752
- ----------------------------------------------------------------------------
Less: Fee waivers and expense reimbursements                      (1,661,719)
- ----------------------------------------------------------------------------
    Net expenses                                                   7,296,033
- ----------------------------------------------------------------------------
Net investment income                                            236,779,733
- ----------------------------------------------------------------------------
Net realized gain on sales of investments                            215,978
- ----------------------------------------------------------------------------
Net increase in net assets resulting from operations            $236,995,711
============================================================================
</TABLE>
 
See Notes to Financial Statements.
 
                                      FS-6
<PAGE>   46
 
STATEMENT OF CHANGES IN NET ASSETS
 
For the years ended August 31, 1997 and 1996
 
<TABLE>
<CAPTION>
                                                             1997              1996
                                                        --------------    --------------
<S>                                                     <C>               <C>
OPERATIONS:

  Net investment income                                 $  236,779,733    $  193,348,214
- ----------------------------------------------------------------------------------------
  Net realized gain on sales of investments                    215,978           490,127
- ----------------------------------------------------------------------------------------
    Net increase in net assets resulting from
      operations                                           236,995,711       193,838,341
- ----------------------------------------------------------------------------------------
Distributions to shareholders from net investment
  income:
    Institutional Class                                   (153,610,717)     (135,680,200)
- ----------------------------------------------------------------------------------------
    Private Investment Class                               (20,120,440)      (20,937,989)
- ----------------------------------------------------------------------------------------
    Personal Investment Class                              (11,733,992)       (6,998,307)
- ----------------------------------------------------------------------------------------
    Cash Management Class                                  (41,058,376)      (28,729,956)
- ----------------------------------------------------------------------------------------
    Resource Class                                         (10,256,208)       (1,001,762)
- ----------------------------------------------------------------------------------------
Distributions to shareholders from net realized
  gains                                                        (59,575)               --
- ----------------------------------------------------------------------------------------
Share transactions-net                                   1,556,740,962       443,432,341
- ----------------------------------------------------------------------------------------
    Net increase in net assets                           1,556,897,365       443,922,468
- ----------------------------------------------------------------------------------------

NET ASSETS:

    Beginning of period                                  3,703,891,140     3,259,968,672
- ----------------------------------------------------------------------------------------
    End of period                                       $5,260,788,505    $3,703,891,140
========================================================================================

NET ASSETS CONSIST OF:

    Shares of beneficial interest                       $5,259,983,781    $3,703,242,819
- ----------------------------------------------------------------------------------------
    Undistributed net realized gain on sales of
      investments                                              804,724           648,321
- ----------------------------------------------------------------------------------------
                                                        $5,260,788,505    $3,703,891,140
========================================================================================
</TABLE>
 
See Notes to Financial Statements.
 
                                      FS-7
<PAGE>   47
 
NOTES TO FINANCIAL STATEMENTS
 
August 31, 1997
 
NOTE 1-SIGNIFICANT ACCOUNTING POLICIES
 
Short-Term Investments Trust (the "Fund") is registered under the Investment
Company Act of 1940, as amended, as an open-end series, diversified management
investment company. The Fund is organized as a Delaware business trust
consisting of two different portfolios, each of which offers separate series of
shares: the Treasury Portfolio and the Treasury TaxAdvantage Portfolio.
Information presented in these financial statements pertains only to the
Treasury Portfolio (the "Portfolio"), with assets, liabilities and operations of
each portfolio being accounted for separately. The Portfolio consists of five
different classes of shares: the Institutional Class, the Private Investment
Class, the Personal Investment Class, the Cash Management Class and the Resource
Class. Matters affecting each class are voted on exclusively by the shareholders
of each class. The Portfolio is a money market fund whose investment objective
is the maximization of current income to the extent consistent with the
preservation of capital and the maintenance of liquidity.
  The following is a summary of significant accounting policies followed by the
Portfolio in the preparation of its financial statements. The preparation of
financial statements in conformity with generally accepted accounting principles
requires management to make estimates and assumptions that affect the reported
amounts of assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.
A. Security Valuations-The Portfolio invests only in securities which have
   maturities of 397 days or less. The securities are valued on the basis of
   amortized cost which approximates market value. 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.
B. Securities Transactions, Investment Income and Distributions-Securities
   transactions are accounted for on a trade date basis. Realized gains or
   losses are computed on the basis of specific identification of the securities
   sold. Interest income, adjusted for amortization of premiums and discounts on
   investments, is accrued daily. Dividends to shareholders are declared daily
   and are paid on the first business day of the following month.
C. Federal Income Taxes-The Portfolio intends to comply with the requirements of
   the Internal Revenue Code necessary to qualify as a regulated investment
   company and, as such, will not be subject to federal income taxes on
   otherwise taxable income (including net realized capital gains) which is
   distributed to shareholders. Therefore, no provision for federal income taxes
   is recorded in the financial statements.
D. Expenses-Distribution and transfer agency expenses directly attributable to a
   class of shares are charged to that class' operations. All other expenses are
   allocated among the classes.
 
NOTE 2-ADVISORY FEES AND OTHER TRANSACTIONS WITH AFFILIATES
 
The Fund has entered into a master investment advisory agreement with A I M
Advisors, Inc. ("AIM"). Under the terms of the master advisory agreement, AIM
receives a monthly fee with respect to the Portfolio calculated by applying a
monthly rate, based upon the following annual rates, to the average daily net
assets of the Portfolio:
 
<TABLE>
<S>                                                             <C>
Net Assets                                                        RATE
- ------------------------------------------------------------------------
First $300 million                                               0.15%
- ------------------------------------------------------------------------
Over $300 million to $1.5 billion                                0.06%
- ------------------------------------------------------------------------
Over $1.5 billion                                                0.05%
- ------------------------------------------------------------------------
</TABLE>
 
  During the year ended August 31, 1997, AIM voluntarily reimbursed expenses of
$24,200.
 
                                      FS-8
<PAGE>   48
 
  The Portfolio, pursuant to a master administrative services agreement with
AIM, has agreed to reimburse AIM for certain costs incurred in providing
accounting services to the Portfolio. During the year ended August 31, 1997, the
Fund reimbursed AIM $99,273 for such services.
  The Portfolio, pursuant to a transfer agency and service agreement, has agreed
to pay A I M Institutional Fund Services, Inc. ("AIFS") a fee for providing
transfer agent and shareholder services to the Portfolio. During the year ended
August 31, 1997, the Portfolio paid AIFS $414,190 for such services. On
September 19, 1997, the Board of Trustees of the Fund approved the appointment
of A I M Fund Services, Inc. ("AFS") as transfer agent of the Fund to be
effective in late 1997 or early 1998.
  Under the terms of a master distribution agreement between Fund Management
Company ("FMC") and the Fund, FMC acts as the exclusive distributor of the
Fund's shares. The Fund has adopted a master distribution plan (the "Plan")
pursuant to Rule 12b-1 under the 1940 Act with respect to the Private Investment
Class, the Personal Investment Class, the Cash Management Class and the Resource
Class of the Portfolio. The Plan provides that the Private Investment Class, the
Personal Investment Class, the Cash Management Class and the Resource Class pay
up to a 0.50%, 0.75%, 0.10%, and 0.20%, respectively, maximum annual rate of the
average daily net assets attributable to such class. Of this amount, the Fund
may pay an asset-based sales charge to FMC and the Fund may pay a service fee of
(a) 0.25% of the average daily net assets of each of the Private Investment
Class and the Personal Investment Class, (b) 0.10% of the average daily net
assets of the Cash Management Class and (c) 0.20% of the average daily net
assets of the Resource Class, to selected banks, broker-dealers and other
financial institutions who offer continuing personal shareholder services to
their customers who purchase and own shares of the Private Investment Class, the
Personal Investment Class, the Cash Management Class or the Resource Class. Any
amounts not paid as a service fee under such Plan would constitute an
asset-based sales charge. 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 each class. During the year ended August 31, 1997, the
Private Investment Class, the Personal Investment Class, the Cash Management
Class and the Resource Class paid $1,195,700, $1,210,290, $625,057, and
$315,905, respectively, as compensation under the Plan. FMC waived fees of
$1,637,519 for the same period. Certain officers and trustees of the Trust are
officers of AIM, FMC, AIFS and AFS.
  During the year ended August 31, 1997, the Portfolio paid legal fees of
$13,565 for services rendered by Kramer, Levin, Naftalis & Frankel as counsel to
the Board of Trustees. A member of that firm is a trustee of the Fund.
 
NOTE 3-TRUSTEES' FEES
 
Trustees' fees represent remuneration paid or accrued to each trustee who is not
an "interested person" of AIM. The Fund may invest trustees' fees, if so elected
by a trustee, in mutual fund shares in accordance with a deferred compensation
plan.
 
                                      FS-9
<PAGE>   49
 
NOTE 4-SHARE INFORMATION
 
Changes in shares outstanding during the years ended August 31, 1997 and 1996
were as follows:
 
<TABLE>
<CAPTION>
                                        1997                                1996
                          ---------------------------------   ---------------------------------
                              SHARES            AMOUNT            SHARES            AMOUNT
                          ---------------   ---------------   ---------------   ---------------
<S>                       <C>               <C>               <C>               <C>
Sold:
  Institutional Class      15,820,439,672   $15,820,439,672    15,527,980,642   $15,527,980,642
- -----------------------------------------------------------------------------------------------
  Private Investment
    Class                   2,377,066,232     2,377,066,232     2,472,141,697     2,472,141,697
- -----------------------------------------------------------------------------------------------
  Personal Investment
    Class                   2,585,293,225     2,585,293,225     1,088,591,830     1,088,591,830
- -----------------------------------------------------------------------------------------------
  Cash Management Class     4,354,698,981     4,354,698,981     4,232,083,227     4,232,083,227
- -----------------------------------------------------------------------------------------------
  Resource Class*           2,558,140,941     2,558,140,941       157,958,663       157,958,663
- -----------------------------------------------------------------------------------------------
Issued as reinvestment
  of dividends:
  Institutional Class          15,531,436        15,531,436         9,763,491         9,763,491
- -----------------------------------------------------------------------------------------------
  Private Investment
    Class                       3,858,592         3,858,592         3,211,766         3,211,766
- -----------------------------------------------------------------------------------------------
  Personal Investment
    Class                       9,897,559         9,897,559         4,455,140         4,455,140
- -----------------------------------------------------------------------------------------------
  Cash Management Class        12,944,226        12,944,226         8,200,664         8,200,664
- -----------------------------------------------------------------------------------------------
  Resource Class*               9,274,277         9,274,277           789,507           789,507
- -----------------------------------------------------------------------------------------------
Reacquired:
  Institutional Class     (14,763,510,184)  (14,763,510,184)  (15,872,219,385)  (15,872,219,385)
- -----------------------------------------------------------------------------------------------
  Private Investment
    Class                  (2,270,031,466)   (2,270,031,466)   (2,517,444,015)   (2,517,444,015)
- -----------------------------------------------------------------------------------------------
  Personal Investment
    Class                  (2,465,181,087)   (2,465,181,087)   (1,014,656,105)   (1,014,656,105)
- -----------------------------------------------------------------------------------------------
  Cash Management Class    (4,328,020,236)   (4,328,020,236)   (3,532,010,008)   (3,532,010,008)
- -----------------------------------------------------------------------------------------------
  Resource Class*          (2,363,661,206)   (2,363,661,206)     (125,414,773)     (125,414,773)
- -----------------------------------------------------------------------------------------------
Net increase                1,556,740,962   $ 1,556,740,962       443,432,341   $   443,432,341
===============================================================================================
</TABLE>
 
* The Resource Class commenced operations on March 12, 1996.
 
                                      FS-10
<PAGE>   50
 
NOTE 5-FINANCIAL HIGHLIGHTS

CASH MANAGEMENT CLASS:
 
Shown below are the financial highlights for a share outstanding of the Cash
Management Class during each of the years in the four-year period ended August
31, 1997 and the period August 17, 1993 (date operations commenced) through
August 31, 1993.
 
<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.
 
                                      FS-11
<PAGE>   51
 
INSTITUTIONAL CLASS:

Shown below are the financial highlights for a share outstanding of the
Institutional Class during each of the years in the five-year period ended
August 31, 1997.
 
<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         0.06         0.04         0.03
- -----------------------------  ----------    ----------   ----------   ----------   ----------
Less distributions:
  Dividends from net
    investment income               (0.05)        (0.05)       (0.06)       (0.04)       (0.03)
- -----------------------------  ----------    ----------   ----------   ----------   ----------
Net asset value, end of
  period                       $     1.00    $     1.00   $     1.00   $     1.00   $     1.00
=============================  ==========    ==========   ==========   ==========   ==========
Total return                         5.47%         5.57%        5.66%        3.53%        3.22%
=============================  ==========    ==========   ==========   ==========   ==========
Ratios/supplemental data:
Net assets, end of period
  (000s omitted)               $3,408,010    $2,335,441   $2,669,637   $2,452,389   $3,652,672
=============================  ==========    ==========   ==========   ==========   ==========
Ratio of expenses to average
  net assets                         0.09%(a)       0.09%       0.10%        0.08%        0.08%
=============================  ==========    ==========   ==========   ==========   ==========
Ratio of net investment
  income to average net
  assets                             5.35%(a)       5.43%       5.53%        3.39%        3.17%
=============================  ==========    ==========   ==========   ==========   ==========
</TABLE>
 
(a) Ratios are based on average net assets of $2,873,371,753.
 
PERSONAL INVESTMENT CLASS:

Shown below are the financial highlights for a share outstanding of the Personal
Investment Class during each of the years in the five-year period ended August
31, 1997.
 
<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      0.03
- --------------------------------------  --------    --------   --------   -------   -------
Less distributions:
  Dividends from net investment income     (0.05)      (0.05)     (0.05)    (0.03)    (0.03)
- --------------------------------------  --------    --------   --------   -------   -------
Net asset value, end of period          $   1.00    $   1.00   $   1.00   $  1.00   $  1.00
======================================  ========    ========   ========   =======   =======
Total return                                4.95%       5.04%      5.13%     3.02%     2.77%
======================================  ========    ========   ========   =======   =======
Ratios/supplemental data:
Net assets, end of period (000s
  omitted)                              $322,971    $192,947   $114,527   $88,582   $69,867
======================================  ========    ========   ========   =======   =======
Ratio of expenses to average net
  assets(a)                                 0.60%(b)     0.59%     0.60%     0.58%     0.53%
======================================  ========    ========   ========   =======   =======
Ratio of net investment income to
  average net assets(c)                     4.85%(b)     4.91%     5.03%     2.99%     2.70%
======================================  ========    ========   ========   =======   =======
</TABLE>
 
(a) After fee waivers and/or expense reimbursements. Ratios of expenses to
    average net assets prior to fee waivers and/or expense reimbursements were
    0.86%, 0.92%, 0.90%, 0.91% and 0.93% for the periods 1997-1993,
    respectively.
 
(b) Ratios are based on average net assets of $242,057,960.
 
(c) 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 4.59%, 4.58%, 4.73%, 2.66% and 2.29% for the periods
    1997-1993, respectively.
 
                                      FS-12
<PAGE>   52
PRIVATE INVESTMENT CLASS:
 
Shown below are the financial highlights for a share outstanding of the Private
Investment Class during each of the years in the five-year period ended August
31, 1997.
 
<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       0.03
- ---------------------------------------  --------    --------   --------   --------   --------
Less distributions:
    Dividends from net investment
      income                                (0.05)      (0.05)     (0.05)     (0.03)     (0.03)
- ---------------------------------------  --------    --------   --------   --------   --------
Net asset value, end of period           $   1.00    $   1.00   $   1.00   $   1.00   $   1.00
- ---------------------------------------  --------    --------   --------   --------   --------
Total return                                 5.16%       5.25%      5.34%      3.22%      2.91%
=======================================  ========    ========   ========   ========   ========
Ratios/supplemental data:
Net assets, end of period (000s
  omitted)                               $463,441    $352,537   $394,585   $412,716   $204,281
=======================================  ========    ========   ========   ========   ========
Ratio of expenses to average net
  assets(a)                                  0.39%(b)     0.39%     0.40%      0.38%      0.38%
=======================================  ========    ========   ========   ========   ========
Ratio of net investment income to
  average net assets(c)                      5.05%(b)     5.14%     5.23%      3.26%      2.81%
=======================================  ========    ========   ========   ========   ========
</TABLE>
 
(a) After fee waivers and/or expense reimbursements. Ratios of expenses to
    average net assets prior to fee waivers and/or expense reimbursements were
    0.59%, 0.59%, 0.60%, 0.60%, and 0.67% for the periods 1997-1993,
    respectively.
 
(b) Ratios are based on average net assets of $398,566,784.
 
(c) 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 4.85%, 4.94%, 5.03%, 3.05%, and 2.52% for the periods
    1997-1993, respectively.
 
RESOURCE CLASS:

Shown below are the financial highlights for a share outstanding of the Resource
Class during the year ended August 31, 1997 and the period March 12, 1996 (date
operations commenced) through August 31, 1996.
 
<TABLE>
<CAPTION>
                                                                1997        1996
                                                              --------    --------
<S>                                                           <C>         <C>
Net asset value, beginning of period                          $   1.00    $   1.00
- ------------------------------------------------------------  --------    --------
Income from investment operations:
    Net investment income                                         0.05        0.03
- ------------------------------------------------------------  --------    --------
Less distributions:
    Dividends from net investment income                         (0.05)      (0.03)
- ------------------------------------------------------------  --------    --------
    Net asset value, end of period                            $   1.00    $   1.00
============================================================  ========    ========
Total return                                                      5.30%    5.09%(a)
============================================================  ========    ========
Ratios/supplemental data:
Net assets, end of period (000s omitted)                      $237,123    $ 33,339
============================================================  ========    ========
Ratio of expenses to average net assets(b)                        0.25%(c)     0.25%(a)
============================================================  ========    ========
Ratio of net investment income to average net assets(d)           5.19%(c)     5.07%(a)
============================================================  ========    ========
</TABLE>
 
(a) Annualized.
 
(b) After fee waivers and/or expense reimbursements. Ratio of expenses to
    average net assets prior to fee waivers and/or expense reimbursement was
    0.29% and 0.29% (annualized) for the periods 1997-1996, respectively.
 
(c) Ratios are based on average net assets of $197,440,644.
 
(d) After fee waivers and/or expense reimbursements. Ratio of net investment
    income to average net assets prior to fee waivers and/or expense
    reimbursement was 5.15% and 5.03% (annualized) for the periods 1997-1996,
    respectively.
 
                                      FS-13
<PAGE>   53









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<PAGE>   54
<TABLE>
- ------------------------------------------------------                  ------------------------------------------------------
- ------------------------------------------------------                  ------------------------------------------------------
<S>                                                                     <C>
SHORT-TERM INVESTMENTS TRUST                                                                   PROSPECTUS       
11 Greenway Plaza, Suite 100                                                               December 17, 1997                        
Houston, Texas 77046-1173                                                                      SHORT-TERM                           
(800) 659-1005                                                                             INVESTMENTS TRUST                        
                                                                                         ---------------------                      
INVESTMENT ADVISOR                                                                                                                  
A I M ADVISORS, INC.                                                                       TREASURY PORTFOLIO                       
11 Greenway Plaza, Suite 100                                                             ---------------------                      
Houston, Texas 77046-1173                                                                                                           
(713) 626-1919                                                                            INSTITUTIONAL CLASS                       
                                                                                           TABLE OF CONTENTS                        
DISTRIBUTOR                                                                                                                         
FUND MANAGEMENT COMPANY                                                                                                      PAGE   
11 Greenway Plaza, Suite 100                                            Summary..........................................      2    
Houston, Texas 77046-1173                                               Table of Fees and Expenses.......................      4    
(800) 659-1005                                                          Financial Highlights.............................      5    
                                                                        Suitability For Investors........................      6    
AUDITORS                                                                Investment Program...............................      6    
KPMG PEAT MARWICK LLP                                                   Purchase of Shares...............................      8    
700 Louisiana                                                           Redemption of Shares.............................      9    
Houston, Texas 77002                                                    Dividends........................................     10    
                                                                        Taxes............................................     10    
CUSTODIAN                                                               Net Asset Value..................................     11    
THE BANK OF NEW YORK                                                    Yield Information................................     11    
90 Washington Street                                                    Reports to Shareholders..........................     11    
11th Floor                                                              Management of the Trust..........................     11    
New York, New York 10286                                                General Information..............................     13    
                                                                        Appendix.........................................    A-1    
TRANSFER AGENT                                                                                                                      
A I M INSTITUTIONAL FUND SERVICES, INC.                                                                                             
11 Greenway Plaza, Suite 100                                                                                                        
Houston, Texas 77046-1173
 
NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION 
OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS 
PROSPECTUS IN CONNECTION WITH THE OFFERING MADE BY THE
PROSPECTUS, AND IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN 
AUTHORIZED BY THE TRUST OR THE DISTRIBUTOR. THIS 
PROSPECTUS DOES NOT CONSTITUTE AN OFFER IN ANY 
JURISDICTION TO ANY PERSON TO WHOM SUCH OFFERING MAY NOT 
LAWFULLY BE MADE.
 
- ------------------------------------------------------                  ------------------------------------------------------      
- ------------------------------------------------------                  ------------------------------------------------------      
</TABLE>
                                                            
                                                            


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