SHORT TERM INVESTMENTS CO /TX/
497, 1995-06-29
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<PAGE>
 
                          SHORT-TERM INVESTMENTS CO.

                                PRIME PORTFOLIO

                              INSTITUTIONAL CLASS


                        Supplement dated June 29, 1995
                               to the Prospectus
                          dated December 30, 1994 and
                  to the Statement of Additional Information
                            dated December 30, 1994


     Effective July 1, 1995, A I M Institutional Fund Services, Inc. ("AIFS"), a
wholly-owned subsidiary of A I M Advisors, Inc. and a registered transfer agent,
will become the exclusive transfer agent and dividend disbursing agent for the
Institutional Class (the "Class") of the Prime Portfolio (the "Portfolio") of
Short-Term Investments Co. (the "Fund").  Since September 16, 1994, AIFS has
been acting as a transfer agent for the Class providing certain limited transfer
agency services for shares of the Class.  The phone number of AIFS is
(800) 659-1005.

     AIFS will provide such transfer agency services pursuant to a Transfer
Agency and Service Agreement, dated September 16, 1994, as amended July 1, 1995,
and the Administrative Services Agreement, dated September 16, 1994, between 
A I M Advisors, Inc. and AIFS will terminate.

     Effective July 17, 1995, purchase orders and redemption requests received
by the Fund after 4:00 p.m. Eastern Time on a business day of the Portfolio will
be effected at the net asset value determined on the next business day.

     Also effective July 17, 1995: (1) the net asset value per share of the
Portfolio will be determined daily as of 4:00 p.m. Eastern Time, (2) dividends
from the net income of the Portfolio will be declared daily to shareholders of
record of the Class of the Portfolio immediately after 4:00 p.m. Eastern Time
and (3) 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.
<PAGE>
 
SHORT-TERM
INVESTMENTS CO.

                             Prospectus
- ------------------------------------------------------------------------------- 
PRIME                             The Prime Portfolio (the "Portfolio") is a
PORTFOLIO                    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 Portfolio seeks
INSTITUTIONAL                to achieve its objective by investing in high
CLASS                        grade money market instruments, such as U.S.
                             Government obligations, bank obligations,
                             commercial instruments and repurchase agreements.
DECEMBER 30, 1994            The instruments purchased by the Portfolio will
                             have maturities of sixty days or less.

                                  The Portfolio is a series portfolio of Short-
                             Term Investments Co. (the "Fund"), an open-end
                             diversified series management investment company.
                             This Prospectus relates solely to the Institutional
                             Class of the 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.

                                  The Fund also offers shares of other classes
                             of the Portfolio pursuant to separate prospectuses:
                             the Cash Management Class, the Private Investment
                             Class and the Personal Investment Class, as well as
                             shares of another portfolio of the Fund, the Liquid
                             Assets Portfolio.

                                  THESE SECURITIES HAVE NOT BEEN APPROVED OR
                             DISAPPROVED BY THE SECURITIES AND EXCHANGE
                             COMMISSION OR ANY STATE SECURITIES COMMISSION NOR
                             HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY
                             STATE SECURITIES COMMISSION PASSED UPON THE
                             ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
                             REPRESENTATION TO THE CONTRARY IS A CRIMINAL
                             OFFENSE.

                                  THIS PROSPECTUS SETS FORTH BASIC INFORMATION
                             THAT A PROSPECTIVE INVESTOR SHOULD KNOW BEFORE
                             INVESTING IN SHARES OF THE INSTITUTIONAL CLASS OF
                             THE PORTFOLIO AND SHOULD BE READ AND RETAINED FOR
                             FUTURE REFERENCE. A STATEMENT OF ADDITIONAL
                             INFORMATION, DATED DECEMBER 30, 1994, HAS BEEN
                             FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
                             AND IS HEREBY INCORPORATED BY REFERENCE. A COPY OF
                             THE STATEMENT OF ADDITIONAL INFORMATION IS ATTACHED
                             HERETO AS AN APPENDIX TO THIS PROSPECTUS.

                                  THE PORTFOLIO'S SHARES ARE NOT DEPOSITS OR
                             OBLIGATIONS OF, OR GUARANTEED OR ENDORSED BY, ANY
                             BANK, AND THE PORTFOLIO'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 PORTFOLIO WILL BE ABLE TO
                             MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER
                             SHARE. SHARES OF THE PORTFOLIO INVOLVE INVESTMENT
                             RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.



[AIM LOGO APPEARS HERE]

Fund Management Company

11 Greenway Plaza
Suite 1919
Houston, TX 77046-1173
(800) 659-1005

<PAGE>
 
                                    SUMMARY

 
THE PORTFOLIO AND ITS INVESTMENT OBJECTIVE
 
  The Fund is an open-end diversified series management investment company.
Pursuant to this Prospectus, the Fund offers shares of the Institutional Class
(the "Class") of the Portfolio at net asset value. The Portfolio is a money
market fund which invests in money market instruments, such as U.S. Government
obligations, bank obligations, commercial instruments and repurchase
agreements. The instruments purchased by the Portfolio will have maturities of
sixty days or less. The investment objective of the Portfolio is the
maximization of current income to the extent consistent with the preservation
of capital and the maintenance of liquidity.

  Pursuant to separate prospectuses, the Fund also offers shares of other
classes of common stock of the Fund representing interests in the Portfolio.
Such classes have different distribution arrangements and are designed for
institutional and other categories of investors. The Fund also offers shares of
another portfolio, the Liquid Assets Portfolio, pursuant to a separate
prospectus. The portfolios of the Fund are referred to collectively as the
"Portfolios."

  Because the Fund declares dividends on a daily basis, shares of each class of
the Portfolio have the same net asset value (proportionate interest in the net
assets of the Portfolio) and bear equally those expenses, such as the advisory
fee, that are allocated to the Portfolio as a whole. All classes of the
Portfolio share a common investment objective and portfolio of investments.
However, different classes of the Portfolio have different shareholder
qualifications and are separately allocated certain class expenses, such as
those associated with the distribution of their shares. Therefore, each class
will have a different dividend payment and a different yield.
 

INVESTORS IN THE CLASS
 
  The Class is designed to be a convenient vehicle in which institutions,
particularly banks, acting for themselves or in a fiduciary, advisory, agency,
custodial or other similar capacity can invest short-term cash reserves in a
diversified, open-end money market fund.
 

PURCHASE OF SHARES
 
  Shares of the Class that are offered hereby are sold at net asset value
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 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
3:00 p.m. Eastern Time will normally be made on the same day. See "Redemption
of Shares."
 

DIVIDENDS
 
  The net income of the Portfolio is declared as a dividend daily to
shareholders of record immediately after 3:00 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 4:00 p.m. Eastern Time on that
day. See "Dividends."
 

CONSTANT NET ASSET VALUE
 
  The Fund 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."
 
                                       2
<PAGE>
 
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. AIM is
primarily engaged in the business of acting as manager or advisor to investment
companies. Under an Administrative Services Agreement, AIM may be reimbursed by
the Fund for its costs of performing certain accounting and other
administrative services for the Fund. See "Management of the Fund -- Investment
Advisor" and "-- Administrator."
 

DISTRIBUTOR
 
  Fund Management Company ("FMC") acts as the exclusive distributor of the
shares of the Class. FMC does not receive any fee from the Fund with respect to
the shares of the Class. See "Purchase of Shares."
 

SPECIAL CONSIDERATIONS
 
  The Portfolio may borrow money and enter into reverse repurchase agreements.
The Portfolio may invest in certificates of deposit and time deposits of London
branches of major domestic banks and in repurchase agreements. The Portfolio
may purchase delayed delivery or when-issued securities. 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. See
"Investment Program."
  
                                       3
<PAGE>
 
                          TABLE OF FEES AND EXPENSES
 
<TABLE>
<S>                                                                                                                 <C>
SHAREHOLDER TRANSACTION EXPENSES -- INSTITUTIONAL CLASS
 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...................................................................................................  .06%
 12b-1 Fees........................................................................................................ None
 Other Expenses....................................................................................................  .02%
                                                                                                                    ----
 Total Portfolio Operating Expenses -- Institutional Class.........................................................  .08%
                                                                                                                    ====
</TABLE>
 
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......................................................... $10
</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 Fund" below.) The expense figures
are based upon actual costs and fees charged to the Class. To the extent any
service providers assume expenses of the Class, such assumption will have the
effect of lowering the Class' 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 SHOULD NOT BE CONSIDERED TO BE AN ACCURATE
REPRESENTATION OF PAST OR FUTURE PERFORMANCE AND ACTUAL EXPENSES MAY BE GREATER
OR LESS THAN THOSE SHOWN.
 
                                       4
<PAGE> 
                              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, 1994. The data has been audited by KPMG Peat Marwick LLP,
independent auditors, whose report on the financial statements and the related
notes appears in the Statement of Additional Information.
 
<TABLE>
<CAPTION>
                        1994           1993        1992        1991        1990        1989        1988        1987
                     ----------     ----------  ----------  ----------  ----------  ----------  ----------  ----------
<S>                  <C>            <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  $     1.00
Income from
 investment
 operations:
 Net investment
  income.........           .04            .03         .04         .07         .08         .09         .07         .06
                     ----------     ----------  ----------  ----------  ----------  ----------  ----------  ----------
 Total from
  investment
  operations.....           .04            .03         .04         .07         .08         .09         .07         .06
Less
 distributions:
 Dividends (from
 net investment
 income).........          (.04)          (.03)       (.04)       (.07)       (.08)       (.09)       (.07)       (.06)
                     ----------     ----------  ----------  ----------  ----------  ----------  ----------  ----------
Net asset value,
 end of period ..    $     1.00     $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00
                     ==========     ==========  ==========  ==========  ==========  ==========  ==========  ==========
Total return.....          3.64%          3.20%       4.44%       7.11%       8.72%       9.42%       7.34%       6.39%
                     ==========     ==========  ==========  ==========  ==========  ==========  ==========  ==========
Ratios/supplemental
 data 
Net assets,
 end of period
 (000s omitted)..    $4,080,753     $4,349,945  $3,993,340  $6,108,991  $6,475,123  $7,003,546  $5,841,901  $4,822,758
                     ==========     ==========  ==========  ==========  ==========  ==========  ==========  ==========
Ratio of expenses
 to average net
 assets..........          0.08%(a)        .07%        .08%        .07%        .07%        .08%        .09%        .08%
                     ==========     ==========  ==========  ==========  ==========  ==========  ==========  ==========
Ratio of net
 investment
 income to
 average
 net assets......          3.58%(a)       3.15%       4.43%       6.89%       8.39%       9.07%       7.11%       6.22%
                     ==========     ==========  ==========  ==========  ==========  ==========  ==========  ==========
<CAPTION>
                        1986        1985
                     ----------- -----------
<S>                  <C>         <C>
Net asset value,
 beginning of
 period..........    $     1.00  $     1.00
Income from
 investment
 operations:
 Net investment
  income.........           .07         .09
                     ----------- -----------
 Total from
  investment
  operations.....           .07         .09
Less
 distributions:
 Dividends (from
 net investment
 income).........          (.07)       (.09)
                     ----------- -----------
Net asset value,
 end of period ..    $     1.00  $     1.00
                     =========== ===========
Total return.....          7.62%       9.23%
                     =========== ===========
Ratios/supplemental
 data 
Net assets,
 end of period
 (000s omitted)..    $4,237,113  $3,840,217
                     =========== ===========
Ratio of expenses
 to average net
 assets..........           .08%        .09%
                     =========== ===========
Ratio of net
 investment
 income to
 average
 net assets......          7.36%       8.83%
                     =========== ===========
</TABLE>
- ------
(a) Ratios are based on average daily net assets of $4,347,222,760.
 
                                       5
<PAGE>
 
                           SUITABILITY FOR INVESTORS
 
  The Class is intended for use primarily by institutions, particularly banks,
as a convenient and economical vehicle in which to invest short-term cash
reserves in an open-end diversified money market fund. Shares of the Class may
not be purchased directly by individuals, although institutions may purchase
shares of the Class 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 recordkeeping. It is anticipated
that most investors will perform their own sub-accounting. To assist these
institutions, information concerning the dividends declared by the Portfolio on
any particular day will normally be available by 4:00 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 diversification, economies of scale and
same-day liquidity. Generally, higher interest rates can be obtained on the
purchase of very large blocks of money market instruments. Of course, any such
relative increase in interest rates may be offset to some extent by the
operating expenses of the 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 cost 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
 
  The investment objective of the Portfolio is deemed to be a matter of
fundamental policy that may not be changed without the approval of a majority
of the Portfolio's shares. The Board of Directors of the Fund reserves the
right to change any of the investment policies, strategies or practices of the
Portfolio, as described in this Prospectus and the Statement of Additional
Information without shareholder approval, except in those instances where
shareholder approval is expressly required.
 

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 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 consists exclusively of money
market instruments which have maturities of 60 days or less from the date of
purchase (except that securities subject to repurchase agreements may have
longer maturities), and normally does not maintain a dollar-weighted average
maturity of its portfolio securities in excess of 40 days.
 

INVESTMENT POLICIES
 
  The Portfolio may invest in a broad range of government, bank and commercial
obligations that may be available in the money markets. Such obligations
include U.S. Treasury obligations, 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.
 
                                       6
<PAGE>
 
Money Market Instruments
 
  The following list of descriptions illustrates the types of instruments in
which the Portfolio intends to invest. The list does not purport to be an
exhaustive list of such instruments, and the Portfolio reserves the right to
invest in money market obligations other than those listed below.
 
  GOVERNMENT OBLIGATIONS. The Portfolio intends to invest in securities issued
or guaranteed as to principal and interest by the U.S. Government or by its
agencies or instrumentalities. Such obligations may be supported (a) by the
full faith and credit of the U.S. Treasury (as in the case of Government
National Mortgage Association Certificates), (b) by the right of the issuer to
borrow from the U.S. Treasury (as in the case of obligations of the Federal
Home Loan Bank), (c) by discretionary authority of the U.S. Government to
purchase certain obligations of the agency or instrumentality (as in the case
of the Federal National Mortgage Association), or (d) only by the credit of the
agency or instrumentality itself (as in the case of obligations of the Student
Loan Marketing Association). No assurance can be given that the U.S. Government
will provide financial support to such U.S. Government sponsored agencies or
instrumentalities in the future, since it is not obligated to do so by law.

  BANK INSTRUMENTS. The Portfolio intends to invest in certificates of deposit
("CDs"), time deposits and bankers' acceptances of domestic commercial banks
having total assets in excess of $1.5 billion as of the date of their most
recently published financial statements and CDs of other domestic banks that
are fully insured as to principal by the Federal Deposit Insurance Corporation.
CDs represent short-term interest-bearing deposits of commercial banks against
which negotiable certificates bearing stated rates of interest are issued.
Bankers' acceptances are short-term negotiable drafts endorsed by commercial
banks which arise primarily from international commercial transactions.
 
  The Portfolio intends to invest in certificates of deposit ("Eurodollar CDs")
and time deposits ("Eurodollar time deposits") of London branches of domestic
banks having total assets in excess of $1.5 billion as of the date of their
most recently published financial statements. Time deposits are non-negotiable
deposits maintained in a banking institution for a specified period of time at
a stated interest rate. The Portfolio will not make any time or savings deposit
if, immediately after making such deposit, over 5% of the Portfolio's total
assets would be invested in time and savings deposits.
 
  COMMERCIAL INSTRUMENTS. The Portfolio intends to invest in commercial
instruments, including commercial paper, master notes and other short-term
corporate instruments, that are denominated in U.S. dollars and which at the
date of purchase are "First Tier" securities as defined in Rule 2a-7 under the
Investment Company Act of 1940, as amended (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 Board of Directors) to be of comparable quality to a rated
security that meets the foregoing quality standards. Commercial paper consists
of short-term promissory notes issued by corporations. Commercial paper may be
traded in the secondary market after its issuance. Master notes are unsecured
demand notes that permit the investment of fluctuating amounts of money at
varying rates of interest pursuant to arrangements with issuers who meet the
quality criteria of the Portfolio. The interest rate on a master note may
fluctuate based upon changes in specified interest rates or be reset
periodically according to a prescribed formula or may be a set rate. Although
there is no secondary market in master notes, if such notes have a demand
feature, the payee may demand payment of the principal amount of the note upon
relatively short notice.
 
  REPURCHASE AGREEMENTS. The Portfolio intends to invest in repurchase
agreements with banks and broker-dealers pertaining to the securities described
above. 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. The
Portfolio may enter into repurchase agreements only with institutions believed
by the Fund's Board of Directors 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 by the Portfolio under the 1940 Act.
Repurchase agreements will be secured by U.S. Treasury securities. For
additional information, see the Statement of Additional Information.
 
                                       7
<PAGE>
 
 Investment Practices
 
  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. 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 AND WHEN-ISSUED SECURITIES. The Portfolio may
enter into delayed delivery agreements and may purchase securities on a "when-
issued" basis.
 
  Delayed delivery agreements are commitments by the Portfolio to dealers or
issuers to acquire securities beyond the customary settlement date for such
securities. These commitments fix the payment price and interest rate to be
received on the investment. Delayed delivery agreements will not be used as a
speculative or leverage technique. Rather, from time to time, the Portfolio's
investment adviser can anticipate that cash for investment purposes will result
from scheduled maturities of existing portfolio instruments or from net sales
of shares of the Portfolio and may enter into delayed delivery agreements to
assure that the Portfolio will be as fully invested as possible in instruments
meeting its investment objective.
 
  Debt securities are sometimes offered on a "when-issued" basis; that is, the
date for delivery of and payment for the securities is not fixed at the date of
purchase, but is set after the securities are issued (normally within forty-
five days after the date of the transaction). The payment obligation and the
interest rate that will be received on the securities are fixed at the time the
buyer enters into the commitment. The Portfolio will only make commitments to
purchase such debt securities with the intention of actually acquiring the
securities, but the Portfolio may sell these securities before the settlement
date if it is deemed advisable.
 
  If the Portfolio enters into a delayed delivery agreement or purchases a
when-issued security, the Portfolio will direct its custodian bank to segregate
cash or other high grade securities (including Money Market Obligations) in an
amount equal to its delayed delivery agreement obligations or when-issued
commitments. If the market value of such securities declines, additional cash
or securities will be segregated on a daily basis so that the market value of
the account will equal the amount of the Portfolio's delayed delivery agreement
obligations and when-issued commitments. To the extent that funds are
segregated, they will not be available for new investment or to meet
redemptions. Investment in securities on a when-issued basis and use of delayed
delivery agreements may increase the Portfolio's exposure to market
fluctuation, or may increase the possibility that the Portfolio will incur a
short-term loss, if the Portfolio must engage in portfolio transactions in
order to honor a when-issued commitment or accept delivery of a security under
a delayed delivery agreement. The Portfolio will employ techniques designed to
minimize these risks. No additional delayed delivery agreements or when-issued
commitments will be made by the Portfolio if, as a result, more than 25% of the
Portfolio's net assets would become so committed.
 
  ILLIQUID SECURITIES. The Portfolio will invest no more than 10% of its net
assets in illiquid securities.
 
                                       8
<PAGE>
 
  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 credit
worthiness 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 sixty 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 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) concentrate 25% or more 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 such Rule may be amended from time to time; 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. The Portfolio will not purchase
 portfolio securities while borrowings in excess of 5% of its total assets are
 outstanding.

  The Portfolio's investment objective and the three investment restrictions of
the Portfolio set forth above (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. The investment policies described above
under the heading "Investment Policies" may be changed without the affirmative
vote of a majority of the outstanding shares of the Portfolio.

  For industry classification purposes, bank broker-dealers are considered to
be part of the banking industry.

  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. The
Securities and Exchange Commission (the "SEC") has proposed certain changes to
Rule 2a-7. While such proposed changes may have a prospective impact on the
investments of the Portfolio, the Portfolio anticipates no difficulty in
complying with any proposed change if adopted by the SEC. A description of
further investment restrictions applicable to the Portfolio is contained in the
Statement of Additional Information.
 
                                       9
<PAGE>
  
                               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 accepted by the Portfolio. Purchase
requests with respect to the Class may also be made via AIM LINK(TM), a
personal computer application software product. Although there is no sales
charge imposed on the purchase of shares of the Class, banks and other
institutions may charge a recordkeeping, account maintenance or other fee to
their customers. Beneficial holders of 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, 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 Portfolio prior to
3:00 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.
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 Portfolio's custodian,
are open for business. It is expected that the Federal Reserve Bank of New York
and The Bank of New York will be closed during the next twelve months on
Saturdays and Sundays and on 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.
 
  Banks will be required to certify to the Fund that they comply with
applicable state laws regarding registration as broker-dealers, or that they
are exempt from such registration.
 
  Subject to the conditions stated above and to the Portfolio's right to reject
any purchase order, orders will be accepted (a) when payment for the shares of
the Class purchased is received by The Bank of New York, the Fund's custodian
bank, in the form described below or (b) at the time the order is placed, if
the Portfolio is assured of payment. Shares of the Class purchased by orders
which are accepted prior to 3:00 p.m. Eastern Time will earn the dividend
declared on the date of purchase.
 
  Payment for shares of the Class purchased must be in 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. Any funds received with respect to an order which is not accepted by
the Portfolio and any funds received for which an order has not been received
will be returned to the sending institution. An order must specify that it is
for the purchase of "Shares of the Institutional Class of the Prime Portfolio,"
otherwise any funds received will be returned to the sending institution.
 
  The minimum initial investment in the Portfolio is $1,000,000. Institutions
may be requested to maintain separate Master Accounts in the Portfolio for
shares of the Class held by the institution (a) for its own account, for the
account of other institutions and for accounts for which the institution acts
as a fiduciary, and (b) for accounts for which the institution acts in some
other capacity. An institution's Master Account(s) and sub-accounts with the
Portfolio 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 Information and Authorization Form must be
completed and sent to FMC, 11 Greenway Plaza, Suite 1919, Houston, Texas 77046-
1173. Account Information and Authorization Forms may be obtained from FMC. Any
changes made to the information provided in the Account Information and
Authorization Form must be made in writing or by completing a new form and
providing it to FMC.
 
  In the interest of economy and convenience, certificates representing shares
of the Class will not be issued except upon written request to the Fund.
Certificates (in full shares only) will be issued without charge and may be
redeposited at any time.
 
  The Fund 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.
 
                                       10
<PAGE>
  
                              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 Portfolio. Redemption requests with respect to the Class may also
be made via AIM LINK(TM), a personal computer application software product.
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 for which certificates have not been issued are normally made by
calling the Fund.
 
  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
Information and Authorization Form, but may be remitted by check upon request
by a shareholder. If a redemption request is received by the Portfolio prior to
3:00 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
Fund after 3:00 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 3:00 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.
 
  A shareholder may change the bank account designated to receive redemption
proceeds by written notice to the Fund. 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 Fund, State Street
Bank and Trust Company, or A I M Institutional Fund Services, Inc. ("AIFS"),
the Class' transfer agents (the "Transfer Agents").
 
  Payment for shares of the Class redeemed by mail and payment for telephone
redemptions in amounts of less than $1,000 will be made by check mailed within
seven days after receipt of the redemption request in proper form. The Fund 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 Fund unless
the Board of Directors of the Fund determines in its sole discretion that
failure to so redeem may have materially adverse consequences to the
shareholders of the Fund.
 

                                   DIVIDENDS
 
  Dividends from the net income of the Portfolio are declared daily to
shareholders of record of the Class as of immediately after 3:00 p.m. Eastern
Time on the day of declaration. Net income for dividend purposes is determined
daily as of 3:00 p.m. Eastern Time. The dividend accrued and paid for the Class
will consist of (a) income of the Portfolio, the allocation of which is based
upon the Class' pro rata share of the total outstanding shares representing an
interest in the Portfolio, less (b) Fund expenses accrued for the applicable
dividend period attributable to the Portfolio, such as custodian fees,
directors' fees, accounting and legal expenses, based upon the Class's pro rata
share of the net assets of the Portfolio, less (c) expenses directly
attributable to the Class that are accrued for the applicable dividend period,
such as distribution expenses, if any, transfer agent fees or registration fees
that may be unique to the Class. 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 be paid by check or wire transfer.
(Wire transfers may only be made in amounts of $1,000 or more.) 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
3:00 p.m. Eastern Time on the last business day of the month. Such election, or
any revocation thereof, must be made either in writing by the institution to
FMC at 11 Greenway Plaza, Suite 1919, Houston, TX 77046-1173, or transmitted
via the version of AIM LINK(TM) containing the subaccounting feature, and will
become effective with dividends paid after its receipt by FMC or, if such
election is transmitted via AIM LINK(TM), FMC's affiliates. 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.
 
                                       11
<PAGE>
 
  The Fund 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 Fund incur or anticipate any unusual expense, loss or
depreciation which could adversely affect the income or net asset value of the
Portfolio, the Fund's Board of Directors 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 Directors 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 in additional 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 Fund and each portfolio of the Fund 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 advisers concerning the application of
state, local or foreign taxes.
 
  The foregoing discussion of federal income tax consequences is based on tax
laws and regulations in effect on the date of this Prospectus which are subject
to change by legislation or administrative action.
 

                                NET ASSET VALUE
 
  The net asset value per share of the Portfolio is determined daily as of 3:00
p.m. Eastern Time on each business day of the Fund. 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 Securities and Exchange Commission
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
 
                                       12
<PAGE>
 
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 Fund 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, 1994, 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 4.63% and 4.74%, 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.
 
  To assist banks and other institutions performing their own sub-accounting,
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 4:00 p.m.
Eastern time.
 

                            REPORTS TO SHAREHOLDERS
 
  The Fund 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 Fund's independent auditors.
 
  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 monthly 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 FUND
 
BOARD OF DIRECTORS
 
  The overall management of the business and affairs of the Fund is vested with
its Board of Directors. The Board of Directors approves all significant
agreements between the Fund and persons or companies furnishing services to the
Fund, including agreements with the Fund's investment advisor, distributor,
custodian and transfer agent. The day-to-day operations of the Fund are
delegated to the Fund's officers and to AIM, subject always to the objective
and policies of the Fund and to the general supervision of the Fund's Board of
Directors.
 

INVESTMENT ADVISOR
 
  A I M Advisors, Inc., 11 Greenway Plaza, Suite 1919, Houston, Texas 77046-
1173, acts as the investment advisor for the Portfolio pursuant to a Master
Investment Advisory Agreement dated as of October 18, 1993 (the "Advisory
Agreement"). AIM was organized in 1976 and, together with its affiliates,
manages or advises 37 investment company portfolios. As of November 30, 1994,
the total assets of the investment company portfolios managed, advised or
administered by AIM and its affiliates were approximately $26.9 billion. AIM is
a wholly-owned subsidiary of A I M Management Group Inc. ("AIM Management").
 
                                       13
<PAGE>
 
  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 also provides that , upon the request of the
Fund's Board of Directors, AIM may perform (or arrange for the performance of)
certain accounting, shareholder servicing and other administrative services for
the Fund which are not required to be performed by AIM under the Advisory
Agreement. 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, 1994, AIM received fees with respect to
the Portfolio which represented 0.06% of the Portfolio's average daily net
assets. Such fees were paid pursuant to an advisory agreement that was
previously in effect, which provided for the same level of compensation to AIM
as the Advisory Agreement. During such fiscal year, the expenses of the Class,
including AIM's fees, amounted to 0.08% of the Class's average daily net
assets.
 

ADMINISTRATOR
 
  The Fund has entered into a Master Administrative Services Agreement dated as
of October 18, 1993 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 Fund 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.
 
  In addition, AIM and AIFS have entered into an Administrative Services
Agreement pursuant to which AIFS is reimbursed by AIM for its costs in
providing shareholder services for the Fund. AIFS or its affiliates received
reimbursement of shareholder services costs of $14,651 with respect to the
Portfolio for the period June 1, 1994 through August 31, 1994 which represented
0.0003% of the Portfolio's average daily net assets.
 

FEE WAIVERS
 
  AIM 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 prior to the end of the fiscal
year.
 

DISTRIBUTOR
 
  The Fund has entered into a Master Distribution Agreement dated as of October
18, 1993 (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 1919,
Houston, Texas 77046-1173. Certain directors and officers of the Fund are
affiliated with FMC. The Distribution Agreement provides that FMC has the
exclusive right to distribute shares of the Fund either directly or through
other broker-dealers. FMC is the distributor of several of the mutual funds
managed or advised by AIM.
 

EXPENSES
 
  Expenses of the Fund which are not directly attributable to the operations of
either of the Portfolios are prorated among all classes of both Portfolios of
the Fund based upon the relative net assets of each class. Expenses of the Fund
which are not directly attributable to a specific class of shares but are
directly attributable to one or both of the Portfolios are prorated among all
classes of such Portfolios based upon the relative net assets of each such
class. Expenses of the Fund 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.
 

PORTFOLIO TRANSACTIONS AND BROKERAGE
 
  AIM is responsible for decisions to buy and sell securities for the
Portfolio, broker-dealer selection and negotiation of commission rates. Since
purchases and sales of portfolio securities by the Portfolio are usually
principal transactions, the
 
                                       14
<PAGE>
 
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 program. 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.
 

                              GENERAL INFORMATION
 
ORGANIZATION AND DESCRIPTION OF SHARES
 
  The Fund was incorporated in Maryland on May 3, 1993. On October 15, 1993,
the Portfolio succeeded to the assets and assumed the liabilities of the Prime
Portfolio (the "Predecessor Portfolio") of Short-Term Investments Co., a
Massachusetts business trust ("STIC"), pursuant to an Agreement and Plan of
Reorganization between the Fund 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 common stock of the
Fund are divided into five classes, of which four, including the Class,
represent interests in the Portfolio, and one represents an interest in the
Liquid Assets Portfolio. Each class of shares has a par value of $.001 per
share. All shares of the Fund 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 each 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 Fund, 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 Fund attributable or allocated to the respective portfolio based on the
respective liquidation value of each 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 directors from office by votes cast at a meeting of shareholders or by
written consent, and a meeting of shareholders may be called at the request of
the holders of 10% or more of the Fund's outstanding shares.
 
  There are no preemptive or conversion rights applicable to any of the Fund's
shares. The Fund's shares, when issued, will be fully paid and non-assessable.
The Board of Directors may create additional portfolios and classes of the Fund
without shareholder approval.
 

TRANSFER AGENTS AND CUSTODIAN
 
  The Bank of New York, 110 Washington Street, 8th Floor, New York, New York
10286, acts as custodian for the portfolio securities and cash of the
Portfolio. State Street Bank and Trust Company, 225 Franklin Street, Boston,
Massachusetts 02110, and A I M Institutional Fund Services, Inc., 11 Greenway
Plaza, Suite 1919, Houston, Texas 77046-1173, act as transfer agents for the
shares of the Class.
 

LEGAL COUNSEL
 
  The law firm of Ballard Spahr Andrews & Ingersoll, Philadelphia,
Pennsylvania, serves as counsel to the Fund and has passed upon the legality of
the shares of the Fund.
 
                                       15
<PAGE>
 
SHAREHOLDER INQUIRIES
 
  Shareholder inquiries concerning the status of an account should be directed
to the Fund at 11 Greenway Plaza, Suite 1919, 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 Fund and the Portfolio prior to investing. A Statement of Additional
Information has been filed with the Securities and Exchange Commission and is
attached as an Appendix to this Prospectus. Additional copies of the Statement
of Additional Information are available upon request and without charge by
writing or calling the Fund or FMC. This Prospectus omits certain information
contained in the registration statement filed with the Securities and Exchange
Commission. Copies of the registration statement, including items omitted
herein, may be obtained from the Securities and Exchange Commission by paying
the charges prescribed under its rules and regulations.
 
                                       16
<PAGE>
 
                                   APPENDIX
 
                                                          STATEMENT OF
                                                          ADDITIONAL INFORMATION
 
                           SHORT-TERM INVESTMENTS CO.
 
                                PRIME PORTFOLIO
                             (INSTITUTIONAL CLASS)
 
                               11 GREENWAY PLAZA
                                   SUITE 1919
                           HOUSTON, TEXAS 77046-1173
                                 (800) 659-1005
 
                                 ------------
 
         THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A PROSPECTUS.
              IT SHOULD BE READ IN CONJUNCTION WITH THE PROSPECTUS
                 THAT PRECEDES THIS APPENDIX, ADDITIONAL COPIES
                      OF WHICH MAY BE OBTAINED BY WRITING
                  FUND MANAGEMENT COMPANY, 11 GREENWAY PLAZA,
                     SUITE 1919, HOUSTON, TEXAS 77046-1173
                           OR CALLING (800) 659-1005
 
                                 ------------
 
          STATEMENT OF ADDITIONAL INFORMATION DATED DECEMBER 30, 1994
               RELATING TO THE PROSPECTUS DATED DECEMBER 30, 1994
 
                                      A-1
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                       PAGE
                                                                       ----
      <S>                                                              <C>
      Introduction.................................................... A-3


      General Information about the Fund.............................. A-3

        The Fund and Its Shares....................................... A-3

        Directors and Officers........................................ A-4

        Investment Advisor............................................ A-7

        Administrator................................................. A-8

        Expenses...................................................... A-9

        Transfer Agent and Custodian.................................. A-9

        Reports....................................................... A-9

        Principal Holders of Securities............................... A-10


      Purchases and Redemptions....................................... A-11

        Net Asset Value Determination................................. A-11

        Distribution Agreement........................................ A-12

        Performance Information....................................... A-12

        Suspension of Redemption Rights............................... A-13


      Investment Program and Restrictions............................. A-13

        Investment Program............................................ A-13

        Eligible Securities........................................... A-14

        Commercial Paper Ratings...................................... A-14

        Bond Ratings.................................................. A-15

        Investment Restrictions....................................... A-16


      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

        Effect of Future Legislation; Local Tax Considerations........ A-20


      Financial Statements............................................ A-21

</TABLE>
 
                                      A-2
<PAGE>
 
 
                                  INTRODUCTION
 
  The Prime Portfolio (the "Portfolio") is an investment portfolio of Short-
Term Investments Co. (the "Fund"), 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 Prospectus dated December 30, 1994 (the "Prospectus") that
precedes this Statement of Additional Information. Additional copies of the
Prospectus and Statement of Additional Information may be obtained without
charge by writing the distributor of the Portfolio's shares, Fund Management
Company ("FMC"), 11 Greenway Plaza, Suite 1919, 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 the Portfolio. Some of the
information required to be in this Statement of Additional Information is also
included in the Prospectus; and, in order to avoid repetition, reference will
be made to sections of the Prospectus. Additionally, the 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 the 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 FUND
 
THE FUND AND ITS SHARES
 
  The Fund is an open-end, diversified series management investment company
which was organized as a corporation under the laws of the State of Maryland on
May 3, 1993. On October 15, 1993, the Portfolio succeeded to the assets and
assumed the liabilities of the Prime Portfolio (the "Predecessor Portfolio") of
Short-Term Investments Co., a Massachusetts business trust ("STIC"), pursuant
to an Agreement and Plan of Reorganization between the Fund 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 common stock of the Fund are redeemable
at their net asset value at the option of the shareholder or at the option of
the Fund in certain circumstances. For information concerning the methods of
redemption and the rights of share ownership, investors should consult the
Prospectus under the captions "General Information" and "Redemption of Shares."
 
  The Fund offers on a continuous basis shares representing an interest in one
of two portfolios: the Portfolio and the Liquid Assets Portfolio (together, the
"Portfolios"). The Portfolio consists of the following four classes of shares:
Cash Management Class, Private Investment Class, Personal Investment Class and
the Institutional Class. The Liquid Assets Portfolio consists of a single class
of shares. Each class of shares has different shareholder qualifications and
bears expenses differently. This Statement of Additional Information and the
associated Prospectus relate solely to the Institutional Class (the "Class") of
the Portfolio. Shares of the other classes of the Portfolio and the single
class of the Liquid Assets Portfolio are offered pursuant to separate
prospectuses and statements of additional information.
 
  As used in the Prospectus, the term "majority of the outstanding shares" of
the Fund, a particular portfolio or a particular class means, respectively, the
vote of the lesser of (i) 67% or more of the shares of the Fund, such portfolio
or such class present at a meeting of the Fund's shareholders, if the holders
of more than 50% of the outstanding shares of the Fund, such portfolio or such
class are present or represented by proxy, or (ii) more than 50% of the
outstanding shares of the Fund, such portfolio or such class.
 
  Shareholders of the Fund do not have cumulative voting rights, and therefore
the holders of more than 50% of the outstanding shares of the Fund voting
together for election of directors can elect all of the members of the Board of
Directors of the Fund. In such event, the remaining holders cannot elect any
members of the Board of Directors of the Fund.
 
  The Board of Directors may classify or reclassify any unissued shares of any
class or classes in addition to those already authorized by setting or changing
in any one or more respects, from time to time, prior to the issuance of such
shares, the preferences, conversion or other rights, voting powers,
restrictions, limitations as to dividends, qualifications, or terms or
conditions of redemption of such shares. Any such classification or
reclassification will comply with the provisions of the Investment Company Act
of 1940 (the "1940 Act").
 
                                      A-3
<PAGE>
 
  The Articles of Incorporation of the Fund authorize the issuance of 10
billion shares, par value $.001 per share, each representing an interest in the
Liquid Assets Portfolio (or class thereof) and 19 billion shares, par value
$.001 per share, representing an interest in the Portfolio (or class thereof).
A share of a Portfolio (or class) represents an equal proportionate interest in
such Portfolio (or class) with each other share of that Portfolio (or class)
and is entitled to a proportionate interest in the dividends and distributions
from that Portfolio (or class). Additional information concerning the rights of
share ownership is set forth in the Prospectus.
 
  The assets received by the Fund for the issue or sale of shares of each of
the Portfolios and all income, earnings, profits, losses and proceeds
therefrom, subject only to the rights of creditors, are allocated to that
Portfolio, and constitute the underlying assets of that Portfolio. The
underlying assets of each of the Portfolios are segregated and are charged with
the expenses with respect to that Portfolio and with a share of the general
expenses of the Fund. While the expenses of the Fund are allocated to the
separate books of account of each of the Portfolios, certain expenses may be
legally chargeable against the assets of the entire Fund.
 
  The Articles of Incorporation provide that no director or officer of the Fund
shall be liable to the Fund or its shareholders for money damages, except (i)
to the extent that it is proved that such director or officer actually received
an improper benefit or profit in money, property or services, for the amount of
the benefit or profit in money, property or services actually received, or (ii)
to the extent that a judgment or other final adjudication adverse to such
director or officer is entered in a proceeding based on a finding in the
proceeding that such director's or officer's action, or failure to act, was the
result of active and deliberate dishonesty and was material to the cause of
action adjudicated in the proceeding. The foregoing shall not be construed to
protect or purport to protect any director or officer of the Fund against any
liability to the Fund or its shareholders to which such director or officer
would otherwise be subject by reason of willful misfeasance, bad faith, gross
negligence or reckless disregard of the duties involved in the conduct of such
office. The Fund shall indemnify and advance expenses to its currently acting
and its former directors to the fullest extent that indemnification of
directors is permitted by the Maryland General Corporation Law. The Fund shall
indemnify and advance expenses to its officers to the same extent as its
directors and to such further extent as is consistent with law. The Board of
Directors may by By-Law, resolution or agreement make further provision for
indemnification of directors, officers, employees and agents of the Fund to the
fullest extent permitted by the Maryland General Corporation Law.
 
  As described in the Prospectus, the Fund will not normally hold annual
shareholders' meetings. At such time as less than a majority of the directors
have been elected by the shareholders, the directors then in office will call a
shareholders' meeting for the election of directors. Upon written request by
ten or more shareholders who have been such for at least six months and who
hold shares constituting 1% of the outstanding shares, stating that such
shareholders wish to communicate with the other shareholders for the purpose of
obtaining the signatures necessary to demand a meeting to consider removal of a
director, the Fund has undertaken to provide a list of shareholders or to
disseminate appropriate materials (at the expense of the requesting
shareholders).
 
  Except as otherwise disclosed in the Prospectus and in this Statement of
Additional Information, the directors shall continue to hold office and may
appoint their successors.
 

DIRECTORS AND OFFICERS
 
  The directors and officers of the Fund and their principal occupations during
the last five years are set forth below. Unless otherwise indicated, the
address of each director and officer is 11 Greenway Plaza, Suite 1919, Houston,
Texas 77046-1173.

 *CHARLES T. BAUER, Director and Chairman

   Director and Chairman and Chief Executive Officer, A I M Management Group
  Inc.; and Chairman of the Board of Directors, A I M Advisors, 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.
- ------
* A director who is an "interested person" of A I M Advisors, Inc. and the Fund
  as defined in the 1940 Act.
 
                                      A-4
<PAGE>
 
   BRUCE L. CROCKETT, Director
   COMSAT Corporation
   6560 Rock Spring Drive
   Bethesda, MD 20817

     Director, President and Chief Executive Officer, COMSAT Corporation
   (Includes COMSAT World Systems, COMSAT Mobile Communications, COMSAT Video
   Enterprises and COMSAT RSI and COMSAT International Ventures). Previously,
   President and Chief Operating Officer, COMSAT Corporation; President, World
   Systems Division; COMSAT Corporation; and Chairman, Board of Governors of
   INTELSAT; (each of the COMSAT companies listed above is an international
   communication, information and entertainment-distribution services company).

   OWEN DALY II, Director
   Six Blythewood Road
   Baltimore, MD 21210

     Director, Cortland Trust Inc. (investment company). Formerly, Director, CF
   & I Steel Corp., Monumental Life Insurance Company and Monumental General
   Insurance Company; and Chairman of the Board of Equitable Bancorporation.

 **CARL FRISCHLING, Director
   919 Third Avenue
   New York, NY 10022 

     Partner, Kramer, Levin, Naftalis, Nessen, Kamin & Frankel (law firm).
   Formerly, Partner, Reid & Priest (law firm); and, prior thereto, Partner,
   Spengler Carlson Gubar Brodsky & Frischling (law firm).

  *ROBERT H. GRAHAM, Director and President

     Director, President and Chief Operating Officer, A I M Management Group
   Inc.; Director and President, A I M Advisors, Inc.; Director and Executive
   Vice President, A I M Distributors, Inc.; Director and Senior Vice
   President, A I M Institutional Fund Services, Inc. and Fund Management
   Company; and Director and Vice President, A I M Capital Management, Inc. and
   A I M Fund Services, Inc.

   JOHN F. KROEGER, Director
   Box 464
   24875 Swan Road -- Martingham
   St. Michaels, MD 21663

     Trustee, Flag Investors International Trust; and Director, Flag Investors
   Emerging Growth Fund, Inc., Flag Investors Telephone Income Fund, Inc., Flag
   Investors Quality Growth Fund, Inc., Flag Investors 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., 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, Director
   8955 Katy Freeway, Suite 204
   Houston, TX 77024

     Attorney in private practice in Houston, Texas.

   IAN W. ROBINSON, Director
   183 River Drive
   Tequesta, FL 33469

     Formerly, Executive Vice President and Chief Financial Officer, Bell
   Atlantic Management Services, 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.
- ------
 * A director who is an "interested person" of A I M Advisors, Inc. and the Fund
   as defined in the 1940 Act.
** A director who is an "interested person" of the Fund as defined in the 1940
   Act.
 
                                      A-5
<PAGE>
 
   LOUIS S. SKLAR, Director
   Transco Tower, 50th Floor
   2800 Post Oak Blvd.
   Houston, TX 77056

     Executive Vice President, Development and Operations, Hines Interests
   Limited Partnership (real estate development).

   JOHN J. ARTHUR, Senior Vice President and Treasurer

     Senior Vice President and Treasurer, A I M Advisors, Inc.; and Vice
   President and 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, Senior Vice President

     Director and President, A I M Capital Management, Inc.; Director and
   Senior Vice President, A I M Management Group Inc. and A I M Advisors, Inc.
   and Director, A I M Distributors, Inc.

   WILLIAM H. KLEH, Senior Vice President

     Director and Senior Vice President, A I M Advisors, Inc.; Director and
   Vice President, A I M Capital Management, Inc., and Fund Management Company;
   Senior Vice President, A I M Management Group Inc.; and Vice President,
   A I M Distributors, Inc.; and A I M Fund Services, Inc.

   CAROL F. RELIHAN, Secretary and Vice President

     Vice President, General Counsel and Secretary, A I M Advisors, Inc., A I M
   Distributors, Inc.; A I M Fund Services, Inc., A I M Institutional Fund
   Services, Inc., A I M Management Group Inc. and Fund Management Company; and
   General Counsel and Secretary, A I M Capital Management, Inc.

   POLLY A. AHRENDTS, Vice President

     Vice President, A I M Capital Management, Inc. 

   MELVILLE B. COX, Vice President

     Vice President, A I M Advisors, Inc., A I M Capital Management, Inc. and
   A I M Fund Services, Inc.; and Assistant Vice President, A I M Distributors,
   Inc. and Fund Management Company. Formerly, Vice President, Charles Schwab &
   Co., Inc.; Assistant Secretary, Charles Schwab Family of Funds and Schwab
   Investments; Chief Compliance Officer, Charles Schwab Investment Management,
   Inc.; and Vice President, Integrated Resources Life Insurance Co. and
   Capital Life Insurance Co.

   KAREN DUNN KELLY, Vice President

     Senior Vice President, A I M Capital Management, Inc.; and Vice President,
   A I M Advisors, Inc.

   J. ABBOTT SPRAGUE, Vice President

     Director and President, A I M Institutional Fund Services, Inc. and Fund
   Management Company; Director and Senior Vice President, A I M Advisors,
   Inc.; and Senior Vice President, A I M Management Group Inc. and A I M Fund
   Services, Inc.

   DANA R. SUTTON, Vice President and Assistant Treasurer

     Vice President and Fund Controller, A I M Advisors, Inc.; and Assistant
   Vice President and Assistant Treasurer, Fund Management Company.

                                      A-6
<PAGE>
 
  The Board of Directors has an Audit Committee, an Investments Committee, and
a Nomination Committee.

  The members of the Audit Committee are Messrs. Daly, Kroeger (Chairman),
Pennock and Robinson. The Audit Committee is responsible for meeting with the
Portfolio'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 directors
as a whole with respect to the Portfolio'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 Directors and such Committee.
 
  The members of the Investments Committee are Messrs. Bauer, Crockett, Daly
(Chairman), Kroeger and Pennock. 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 Directors and such Committee.
 
  The members of the Nominating and Compensation Committee are Messrs.
Crockett, Daly, Kroeger, Pennock (Chairman) and Sklar. The Nominating and
Compensation Committee is responsible for considering and nominating
individuals to stand for election as directors who are not interested persons
as long as the Fund maintains a distribution plan pursuant to Rule 12b-1 under
the 1940 Act, reviewing from time to time the compensation payable to the
disinterested directors, or considering such matters as may from time to time
be set forth in a charter adopted by the Board of Directors and such Committee.
 
  All of the Fund's directors 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. All of the Fund's
executive officers hold similar offices with some or all of such investment
companies.
 
  Each director is reimbursed for expenses incurred in connection with each
meeting of the Board of Directors or any Committee attended. The directors of
the Fund who do not serve as officers of the Fund are compensated for their
services according to a fee schedule which recognizes the fact that they also
serve as directors or trustees of certain other investment companies advised or
managed by AIM. Each such director receives a fee, allocated among the
investment companies for which he serves as a director or trustee, which
consists of two components: (i) an annual retainer, based on the number of
series portfolios of the investment companies for which such director serves as
director/trustee ("Series"), which annual retainer shall equal the sum of
$7,500 for the first Series, $5,000 for the second Series, $2,500 for the third
Series, $1,000 for each of the fourth through tenth Series, and $750 for each
additional Series, with 50% of such annual retainer being allocated equally
among the Series for which the director serves as director/trustee, and 50% of
such annual retainer being allocated among the Series based upon their relative
net assets; and (ii) a meeting fee of $250 per Series, up to a maximum of
$1,000 per meeting, for each board meeting attended in person by such director,
with 50% of such meeting fee being allocated equally among the Series for which
the director serves as director/trustee, and 50% allocated among the Series
based upon their relative net assets.
 
  During the fiscal year ended August 31, 1994, $37,943 in directors' fees and
expenses were allocated to the Portfolio.
 
  The Fund paid Reid & Priest $28,323 in legal fees for services provided to
the Portfolio during the fiscal year ended August 31, 1994. Carl Frischling,
Esquire, director to the Fund, was a partner in such firm during the term
services were provided to the Portfolio.
 

INVESTMENT ADVISOR
 
  A I M Advisors, Inc., 11 Greenway Plaza, Suite 1919, Houston, Texas 77046-
1173, acts as the Portfolio's investment advisor pursuant to a Master
Investment Advisory Agreement dated as of October 18, 1993 (the "Advisory
Agreement"). A prior investment advisory agreement (the "Prior Advisory
Agreement") with substantially identical terms (including the fee schedules) to
the Advisory Agreement was previously in effect with respect to the Predecessor
Portfolio.
 
  AIM was organized in 1976 and, together with its affiliates, advises or
manages 37 investment company portfolios. As of November 30, 1994, the total
assets of the investment company portfolios managed or advised by AIM and its
affiliates were approximately $26.9 billion. AIM is a wholly-owned subsidiary
of A I M Management Group Inc. ("AIM Management"), 11 Greenway Plaza, Suite
1919, Houston, Texas 77046-1173. All of the directors and certain of the
officers of AIM are also executive officers of the Fund and their affiliations
are shown under "Directors and Officers."
 
  Pursuant to the terms of the Advisory Agreement, AIM manages the investment
of the Portfolio's assets. AIM obtains and evaluates economic, statistical and
financial information to formulate and implement investment policies for the
Portfolio. Any
 
                                      A-7
<PAGE>
 
investment program undertaken by AIM will at all times be subject to the
policies and control of the Fund's Board of Directors. AIM shall not be liable
to the Fund or its shareholders for any act or omission by AIM or for any loss
sustained by the Fund or its shareholders except in the case of willful
misfeasance, bad faith, gross negligence or reckless disregard of duty.
 
  As compensation for its services, 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 $100 million.............................................. .20%
      Over $100 million to $200 million............................... .15%
      Over $200 million to $300 million............................... .10%
      Over $300 million to $1.5 million............................... .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 Portfolio's shares are
qualified for sale.
 
  The Advisory Agreement provides that, upon the request of the Board of
Directors, 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
Directors, based upon a finding by the Board of Directors that the provision of
such services would be in the best interest of the Portfolio and its
shareholders. The Board of Directors 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
"Administrator."
 
  For the fiscal years ended August 31, 1994, 1993 and 1992, AIM received fees
with respect to the Portfolio (and the Predecessor Portfolio) in the amounts of
$2,599,662, $2,647,096 and $3,060,139, respectively.
 
  The Advisory Agreement will continue in effect until June 30, 1995, and from
year to year thereafter, provided that it is specifically approved at least
annually by the Fund's Board of Directors and the affirmative vote of a
majority of the directors 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 Fund 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.
 

ADMINISTRATOR
 
  AIM also acts as the Portfolio's administrator pursuant to a Master
Administrative Services Agreement, dated as of October 18, 1993 between AIM and
the Fund (the "Administrative Services Agreement"). In addition, AIM and A I M
Institutional Fund Services, Inc. ("AIFS") have entered into an administrative
services agreement, dated as of September 16, 1994 (the "AIFS 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 Fund and of
persons working under his supervision for maintaining the financial accounts
and books and records of the Fund, 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 Fund's
Board of Directors.
 
  The AIFS Administrative Services Agreement between AIM and AIFS, a registered
transfer agent and wholly-owned subsidiary of AIM, provides that AIFS may
perform certain shareholder services for the Portfolio. For such services, AIFS
is entitled to receive from AIM such reimbursement of its costs associated with
the Portfolio.
 
  Under the terms of the Prior Advisory Agreement, AIM was reimbursed for the
fiscal years ended August 31, 1993 and 1992 in the amounts of $94,922 and
$111,576, respectively, for fund accounting services for the Portfolio.
Pursuant to the Administrative Services Agreement AIM was reimbursed for the
fiscal year ended August 31, 1994 in the amount of $106,109
 
                                      A-8
<PAGE>
 
for fund accounting services for the Portfolio. For the period from June 1,
1994 through August 31, 1994, AIFS or its affiliates received shareholder
services fees from AIM with respect to the Portfolio in the amount of $14,651.

 
EXPENSES
 
  Expenses of the Fund include, but are not limited to, fees paid to AIM under
the Advisory Agreement the charges and expenses of any registrar, any custodian
or depositary appointed by the Fund for the safekeeping of cash, portfolio
securities and other property, and any transfer, dividend or accounting agent
or agents appointed by the Fund; brokers' commissions chargeable to the Fund in
connection with portfolio securities transactions to which the Fund is a party;
all taxes, including securities issuance and transfer taxes, and fees payable
by the Fund to federal, state or other governmental agencies; the costs and
expenses of engraving or printing of certificates representing shares of the
Fund; all costs and expenses in connection with the registration and
maintenance of registration of the Fund and 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 Fund and supplements thereto to the Fund's shareholders; all
expenses of shareholders' and directors' meetings and of preparing, printing
and mailing of prospectuses, proxy statements and reports to shareholders; fees
and travel expenses of directors and director 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 Fund's shares; charges and expenses
of legal counsel, including counsel to the directors of the Fund who are not
"interested persons" (as defined in the 1940 Act) of the Fund or AIM, and of
independent accountants in connection with any matter relating to the Fund,
membership dues of industry associations; interest payable on Fund borrowings;
postage; insurance premiums on property or personnel (including officers and
directors) of the Fund 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 Fund) 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 Fund's shares.
 
  Expenses of the Fund which are not directly attributable to the operations of
either of the Portfolios are prorated among all classes of the Fund based upon
the relative net assets of each class. Expenses of the Fund which are not
directly attributable to a specific class of shares but are directly
attributable to one or both of the Portfolios are prorated among all classes of
such Portfolios based upon the relative net assets of each such class. The
expenses of the Portfolio are deducted from its total income before dividends
are paid. Expenses of the Fund 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.
 

TRANSFER AGENTS AND CUSTODIAN
 
  The Bank of New York acts as custodian for the portfolio securities and cash
of the Portfolio. The Bank of New York receives such compensation from the Fund
for its services in such capacity as is agreed to from time to time by The Bank
of New York and the Fund. The address of The Bank of New York is 110 Washington
Street, 8th Floor, New York, New York 10286.
 
  State Street Bank and Trust Company serves as a transfer agent for the shares
of the Class and receives such compensation from the Fund for its services in
such capacity as is agreed to from time to time by State Street Bank and Trust
Company and the Fund. The address of State Street Bank and Trust Company is 225
Franklin Street, Boston, Massachusetts 02110. A I M Institutional Fund
Services, Inc., 11 Greenway Plaza, Suite 1919, Houston, Texas 77046-1173, also
acts as a transfer agent for the shares of the Class and currently receives no
compensation from the Fund for its services.
 

REPORTS
 
  The Fund furnishes shareholders with semi-annual reports containing
information about the Fund and its operations, including a schedule of
investments held in the Portfolio and its financial statements. The annual
financial statements are audited by the Fund's independent auditors. The Board
of Directors has selected KPMG Peat Marwick LLP, NationsBank Building, 700
Louisiana, Houston, Texas 77002, as the independent auditors to audit the
financial statements and review the tax returns of the Portfolio.
 
                                      A-9
<PAGE>
 
PRINCIPAL HOLDERS OF SECURITIES
 
PRIME PORTFOLIO
 
  To the best of the knowledge of the Fund, the names and addresses of the 
holders of 5% or more of the outstanding shares of any class of the Portfolio 
as of November 22, 1994, and the percentage of the Portfolio's outstanding 
shares owned by such shareholders as of such date are as follows:
 
<TABLE>
<CAPTION>
                                                                   PERCENT
                         NAME AND ADDRESS                          OWNED OF
                         OF RECORD OWNER                        RECORD ONLY(1)
                         ----------------                       ----------------
   INSTITUTIONAL CLASS
   -------------------
   <S>                                                          <C>
    NationsBank of Texas, N.A..................................      16.46%
     1401 Elm Street, 11th Floor
     Dallas, TX 75202-2911

    US Bank of Oregon..........................................      13.29%
     321 Southwest Sixth
     Portland, OR 97208

    Frost National Bank........................................       7.33%
     P.O. Box 1600
     San Antonio, TX 78296

    Wachovia Bank & Trust Co...................................       6.97%
     P.O. Box 3075
     Winston Salem, NC 27150

    Texas Commerce Bank........................................       6.87%
     601 Travis
     Houston, TX 77700

    Trust Company of Georgia...................................       6.40%
     P.O. Box 105213
     Atlanta, GA 30348

    Boatmen's Trust Company....................................       6.28%
     P.O. Box 14737
     St. Louis, MO 63178

    Liberty Bank and Trust Company of Tulsa, N.A...............       5.04%
     P.O. Box 705
     Tulsa, OK 74101

<CAPTION>
   PRIVATE INVESTMENT CLASS
   ------------------------
   <S>                                                          <C>
    Liberty Bank and Trust Company of Tulsa, N.A...............       9.70%
     P.O. Box 705
     Tulsa, OK 74101

    Huntington Capital Corp....................................       6.46%
     41 S. High Street, 9th Floor
     Columbus, OH 43287
 
<CAPTION>
   PERSONAL INVESTMENT CLASS
   -------------------------
   <S>                                                          <C>
    The Bank of New York.......................................      31.35(2)
     440 Mamaroneck Ave.
     Harrison, NY 10528
</TABLE>
- ------
(1)   The Fund has no knowledge as to whether all or any portion of the shares
      of the class owned of record are also owned beneficially.
(2)   A shareholder who holds 25% or more 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-10
<PAGE>
 
<TABLE>
<CAPTION>
                        NAME AND ADDRESS                       PERCENT OWNED OF
                         OF RECORD OWNER                        RECORD ONLY(1)
                        ----------------                       ----------------
   CASH MANAGEMENT CLASS
   ---------------------
   <S>                                                         <C>
    Citibank as Agent for Customer............................      100.00%(2)
     120 Wall Street
     New York, NY 10043

</TABLE> 
 
LIQUID ASSETS PORTFOLIO
 
  To the best of the knowledge of the Fund, the names and addresses of the
holders of 5% or more of the outstanding shares of the Liquid Assets Portfolio
as of November 22, 1994, and the percentage of the Portfolio's outstanding
shares owned by such shareholders as of such date are as follows:
 
    NationsBank of Texas, N.A.................................      19.70%
     1401 Elm Street, 11th Floor
     Dallas, TX 75202-2911

    Trust Company of Georgia..................................      14.67%
     P.O. Box 105213
     Atlanta, GA 30348

    Boatmen's Trust Company...................................      12.46%
     P.O. Box 14737
     St. Louis, MO 63178

    Mellon Bank, N.A..........................................       9.84%
     Two Mellon Bank Center, Room 15206
     Pittsburgh, PA 15259-0001
 
  To the best of the knowledge of the Fund, as of November 22, 1994, the
directors and officers of the Fund beneficially owned less than 1% of any
portfolio's outstanding shares.
 

                           PURCHASES AND REDEMPTIONS

 
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 under the 1940 Act, which require the Portfolio
to adhere to certain conditions. These rules require that the Portfolio
maintain a dollar-weighted average portfolio maturity of 90 days or less,
purchase only instruments having remaining maturities of 397 calendar days or
less and invest only in securities determined by the Board of Directors to be
"Eligible Securities" and to present minimal credit risk to the Portfolio.
- ------
(1)   The Fund has no knowledge as to whether all or any portion of the shares
      of the class owned of record are also owned beneficially.
(2)   A shareholder who holds 25% or more 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-11
<PAGE>
 
  The Board of Directors is required to establish procedures designed to
stabilize, to the extent reasonably practicable, the Portfolio's price per
share at $1.00 as computed for the purpose of sales and redemptions. Such
procedures include review of the Portfolio's holdings by the Board of
Directors, 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
Directors determines that such a deviation exists, it will take such corrective
action as the Board of Directors deems necessary and appropriate, 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 Fund has entered into a Master Distribution Agreement dated as of October
18, 1993 (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. The address of FMC is 11 Greenway Plaza, Suite 1919, Houston, Texas
77046-1173. See "General Information about the Fund--Directors and Officers"
and "General Information about the Fund -- Investment Advisor" for information
as to the affiliation of certain directors and officers of the Fund with FMC,
AIM and AIM Management.
 
  The Distribution Agreement provides that FMC has the exclusive right to
distribute the shares of the Class 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 Portfolio 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 Class. FMC
does not receive any fees with respect to the shares of the Class pursuant to
the Distribution Agreement.
 
  The Distribution Agreement will continue in effect until June 30, 1995, and
from year to year thereafter, provided that it is specifically approved at
least annually by the Fund's Board of Directors and the affirmative vote of the
directors 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. The Fund 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.
 

PERFORMANCE INFORMATION
 
  As stated under the caption "Yield Information" in the Prospectus, yield
information for the shares of the Class may be obtained by calling the Fund at
(800) 659-1005. The current yield quoted will be the net average annualized
yield for an identified period. 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 Fund
may also furnish a quotation of effective yield for the Class 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, 1994, 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) for the Class were 4.63% and 4.74%, 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.
 
                                      A-12
<PAGE>
 
  The Fund may compare the performance of the Class or the performance of
securities in which the Portfolio 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(R) of Holliston, Massachusetts 01746 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"). 

  The principal value and interest rate of CDs and money market securities are
fixed at the time of purchase whereas the 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 Fund may reference the growth and variety of money market mutual funds
and AIM's innovation and participation in the industry.
 

SUSPENSION OF REDEMPTION RIGHTS
 
  The right of redemption may be suspended or the date of payment upon
redemption may be postponed when (a) trading on the New York Stock Exchange is
restricted, as determined by applicable rules and regulations of the SEC, (b)
the New York Stock Exchange is closed for other than customary weekend or
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 Portfolio not reasonably
practicable.
 

                      INVESTMENT PROGRAM AND RESTRICTIONS

 
INVESTMENT PROGRAM
 
  The Portfolio may invest in certificates of deposit ("Eurodollar CDs") and
time deposits ("Eurodollar time deposits") of London branches of domestic banks
having total assets of $1.5 billion as of the date of their most recently
published financial statements. Accordingly, an investment in the Portfolio may
involve risks that are different in some respects from those incurred by an
investment company which invests only in debt obligations of U.S. domestic
issuers. Such risks include future political and economic developments, the
possible seizure or nationalization of foreign deposits, the possible
imposition of United Kingdom withholding taxes on interest income payable on
Eurodollar CDs or Eurodollar time deposits, and the possible establishment of
exchange controls or the adoption of other foreign governmental restrictions
which might adversely affect the payment of principal and interest on
Eurodollar CDs and Eurodollar time deposits.
 
  Rule 2a-7 under the 1940 Act provides that a money market fund shall not
invest more than 5% of its total assets in securities issued by the issuer of
the security, provided that such a fund may invest more than 5% of its total
assets in the First Tier securities of a single issuer for a period of up to 3
business days after the purchase thereof if the money market fund is a
diversified investment company, provided further, that the fund may not make
more than one investment in accordance with the foregoing proviso at any time.
Under Rule 2a-7, for purposes of determining the percentage of a fund's total
assets that are invested in securities of an issuer, a repurchase agreement
shall be deemed to be an acquisition of the underlying securities, provided
that the obligation of the seller to repurchase the securities from the money
market fund is fully collateralized. To be fully collateralized, the collateral
must, among other things, consist entirely of U.S. Government securities or
securities that, at the time the repurchase agreement is entered into, are
rated in the highest rating category by Requisite NRSROs.
 
                                      A-13
<PAGE>
 
  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.
 

ELIGIBLE SECURITIES
 
  Rule 2a-7 under the 1940 Act, which governs the operations of money market
funds, defines an "Eligible Security" as follows: 

   (i) a security with a remaining maturity of 397 days or less that is rated
 (or that has been issued by an issuer that is rated with respect to a class
 of short-term debt obligations, or any security within that class, that is
 comparable in priority and security with the security) by the Requisite
 NRSROs(1) in one of the two highest rating categories for short-term debt
 obligations (within which there may be subcategories or gradations
 indicating relative standing); or

   (ii) a security:

    (A) that at the time of issuance was a long-term security but that has
  a remaining maturity of 397 calendar days or less, and 

    (B) whose issuer has received from the Requisite NRSROs a rating, with
  respect to a class of short-term debt obligations (or any security within
  that class) that is now comparable in priority and security with the
  security, in one of the two highest rating categories for short-term debt
  obligations (within which there may be sub-categories or gradations
  indicating relative standing); or 

   (iii) an unrated security(2) that is of comparable quality to a security
 meeting the requirements of paragraphs (a)(5)(i) or (ii) of this section, as
 determined by the money market fund's board of directors; provided, however,
 that:

    (A) the board of directors may base its determination that a standby
  commitment is an Eligible Security upon a finding that the issuer of the
  commitment presents a minimal risk of default; and

    (B) a security that at the time of issuance was a long-term security
  but that has a remaining maturity of 397 calendar days or less and that
  is an unrated security is not an Eligible Security if the security has a
  long-term rating from any NRSRO that is not within the NRSRO's two
  highest categories (within which there may be sub-categories or
  gradations indicating relative standing).
 

COMMERCIAL PAPER RATINGS
 
  The following is a description of the factors underlying the commercial paper
ratings of Moody's, S&P and Fitch Investors Service, Inc. ("Fitch").

  MOODY'S--The rating Prime-1 (P-1) is the highest commercial paper rating
assigned by Moody's. Among the factors considered by Moody's in assigning
ratings are the following: (1) evaluation of the management of the issuer; (2)
economic evaluation of the issuer's industry or industries and an appraisal of
speculative-type risks which may be inherent in certain areas; (3) evaluation
of the issuer's products in relation to competition and customer acceptance;
(4) liquidity; (5) amount and quality of long-term debt; (6) trend of earnings
over a period of ten years; (7) financial strength of a parent company and
- ------
(1) "Requisite NRSRO" means (a) any two nationally recognized statistical rating
    organizations that have issued a rating with respect to a security or class
    of debt obligations of an issuer, or (b) if only one NRSRO has issued a
    rating with respect to such security or issuer of such security, that NRSRO.
    At present the NRSROs are: Standard & Poor's Corp., Moody's Investors
    Service, Inc., Duff and Phelps, Inc., Fitch Investors Services, Inc. and,
    with respect to certain types of securities, IBCA Limited and its affiliate,
    IBCA Inc. Subcategories or gradations in ratings (such as a "+" or "-") do
    not count as rating categories.
(2) An "unrated security" is a security (i) issued by an issuer that does not
    have a current short-term rating from any NRSRO, either as to the particular
    security or as to any other short-term obligations of comparable priority
    and security; (ii) that was a long-term security at the time of issuance and
    whose issuer has not received from any NRSRO a rating with respect to a
    class of short-term debt obligations now comparable in priority and
    security; or (iii) a security that is rated but which is the subject of an
    external credit support agreement not in effect when the security was
    assigned its rating, provided that a security is not an unrated security if
    any short-term debt obligation issued by the issuer and comparable in
    priority and security is rated by any NRSRO.
 
                                      A-14
<PAGE>
 
the relationship which exists with the issuer; and (8) recognition by the
management of obligations which may be present or may arise as a result of
public interest questions and preparations to meet such obligations. These
factors are all considered in determining whether the commercial paper is rated
P-1, P-2 or P-3.
 
  S&P--Commercial paper rated A-1 by S&P has the following characteristics.
Liquidity ratios are adequate to meet cash requirements. Long-term senior debt
is rated "A" or better, although in some cases "BBB" credits may be allowed.
The issuer has access to at least two additional channels of borrowing. Basic
earnings and cash flow have an upward trend with allowance made for unusual
circumstances. Typically, the issuer's industry is well established and the
issuer has a strong position within the industry. The reliability and quality
of management is unquestioned. The relative strength or weakness of the above
factors determine whether the issuer's commercial paper is rated A-1, A-2 or 
A-3.
 
  FITCH--Fitch's short-term ratings apply to debt obligations that are payable
on demand or have original maturities of generally up to three years, including
commercial paper, certificates of deposit, medium-term notes, and municipal and
investment notes. The short-term rating places greater emphasis than a long-
term rating on the existence of liquidity necessary to meet the issuer's
obligations in a timely manner. Fitch short-term ratings are as follows:
 

                                      F-1
 
  Exceptionally Strong Credit Quality. Issues assigned this rating are regarded
as having the strongest degree of assurance for timely payment.
 

                                      F-2
 
  Very Strong Credit Quality. Issues assigned this rating reflect an assurance
of timely payment only slightly less in degree than issues rated "F-1."
 

                             PLUS (+) AND MINUS (-)
 
  Plus and minus signs are used with a rating symbol to indicate the relative
position of a credit within the rating category.
 

                                      LOC
 
  The symbol LOC indicates that the rating is based on a letter of credit
issued by a commercial bank.
 

BOND RATINGS
 
  The following is a description of the factors underlying the bond ratings of
Moody's, S&P and Fitch.

  MOODY'S--The following are the two highest bond ratings of Moody's.
 

                                      Aaa
 
  Bonds which are rated Aaa are judged to be of the best quality. They carry
the smallest degree of investment risk and are generally referred to as "gilt
edge." Interest payments are protected by a large or by an exceptionally stable
margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.
 

                                       Aa
 
  Bonds which are rated Aa are judged to be of high quality by all standards.
Together with the Aaa group they comprise what are generally known as high
grade bonds. They are rated lower than the best bonds because margins of
protection may not be as large as Aaa securities or fluctuation of protective
elements may be of greater amplitude or there may be other elements present
which make the long term risks appear somewhat larger than in Aaa securities.

  S&P--The following are the two highest bond ratings of S&P.
 
                                      A-15
<PAGE>
 
                                      AAA
 
  Bonds rated AAA are the highest grade obligations. They possess the ultimate
degree of protection as to principal and interest. Market values of bonds rated
AAA move with interest rates, and hence provide the maximum safety on all
counts.
 

                                       AA
 
  Bonds rated AA also qualify as high grade obligations, and in the majority of
instances differ from AAA issues only in small degree. Here, too, prices move
with the long-term money market.

  FITCH--Fitch investment grade bond ratings provide a guide to investors in
determining the credit risk associated with a particular security. The ratings
represent Fitch's assessment of the issuer's ability to meet the obligations of
a specific debt issue or class of debt in a timely manner.

  The rating takes into consideration special features of the issue, its
relationship to other obligations of the issuer, the current and prospective
financial condition and operating performance of the issuer and any guarantor,
as well as the economic and political environment that might affect the
issuer's future financial strength and credit quality.
 
  Fitch ratings do not reflect any credit enhancement that may be provided by
insurance policies or financial guarantees unless otherwise indicated.
 
  Bonds that have the same rating are of similar but not necessarily identical
credit quality since the rating categories do not fully reflect small
differences in the degrees of credit risk.
 
  Fitch ratings are not recommendations to buy, sell or hold any security.
Ratings do not comment on the adequacy of market price, the suitability of any
security for a particular investor, or the tax-exempt nature or taxability of
payments made in respect of any security.
 
  Fitch ratings are based on information obtained from issuers, other obligors,
underwriters, their experts, and other sources Fitch believes to be reliable.
Fitch does not audit or verify the truth or accuracy of such information.
Ratings may be changed, suspended, or withdrawn as a result of changes in, or
the unavailability of, information or for other reasons.
 

                                      AAA
 
  Bonds rated AAA are considered to be investment grade and of the highest
credit quality. The obligor has an exceptionally strong ability to pay interest
and repay principal, which is unlikely to be affected by reasonably foreseeable
events.
 

                                       AA
 
  Bonds rated AA are considered to be investment grade and of very high credit
quality. The obligor's ability to pay interest and repay principal is very
strong, although not quite as strong as bonds rated "AAA." Because bonds rated
in the "AAA" and "AA" categories are not significantly vulnerable to
foreseeable future developments, short-term debt of these issuers is generally
rated "F-1."
 

INVESTMENT RESTRICTIONS
 
  As a matter of fundamental policy which may not be changed without the
approval of the holders of a majority of the outstanding shares of the
Portfolio (as that term is defined under "General Information about the Fund--
The Fund and its Shares"), the Portfolio may not:

   (1) concentrate 25% or more 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
 
                                      A-16
<PAGE>
 
 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; 

   (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; 

   (8) purchase or sell commodities or commodity futures contracts, purchase
 securities on margin, make short sales or invest in puts or calls;

   (9) invest in any obligation not payable as to principal and interest in
 United States currency; or

   (10) acquire for value the securities of any other investment company,
 except in connection with a merger, consolidation, reorganization or
 acquisition of assets. 

  The following investment policies and restrictions are not fundamental
policies and may be changed by the Board of Directors of the Fund without
shareholder approval. The Portfolio does not intend to invest in companies for
the purpose of exercising control or management.

  State Law Restrictions. The Fund may, from time to time in order to qualify
shares of the Portfolio for sale in a particular state, agree to certain
investment restrictions in addition to or more stringent than those set forth
above. Such restrictions are not fundamental and may be changed without the
approval of shareholders.
 
                                      A-17
<PAGE>
 
                             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 investment policy of the Portfolio requires that investments
mature within 60 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. Certain research
services furnished by dealers may be useful to AIM with 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.
 
  Provisions of the 1940 Act and rules and regulations thereunder have been
construed to prohibit the Fund 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 Fund has
obtained an order of exemption from the SEC which permits the Fund to engage in
certain transactions with such 5% holder, if the Fund 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, persons affiliated with the Fund 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.
The Board of Directors has adopted procedures pursuant to Rule 17a-7 under the
1940 Act relating to portfolio transactions among the Portfolio and the AIM
Funds and the Portfolio may from time to time enter into transactions in
accordance with such Rule and procedures.
 
                                      A-18
<PAGE>
 
                                  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 planning.
 

QUALIFICATION AS A REGULATED INVESTMENT COMPANY
 
  The Fund 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 Fund 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 Fund 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 must (1) 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) derive less
than 30% of its gross income (exclusive of certain gains on designated hedging
transactions that are offset by realized or unrealized losses on offsetting
positions) from the sale or other disposition of stock, securities or foreign
currencies (or of options, futures or forward contracts thereon) held for less
than three months (the "Short-Short Gain Test"). However, foreign currency
gains, including those derived from options, futures and forward contracts,
will not be characterized as Short-Short Gain if they are directly related to
the regulated investment company's principal business of investing in stock or
securities (or in options or futures thereon). Because of the Short-Short Gain
Test, a fund may have to limit the sale of appreciated securities that it has
held for less than three months. However, the Short-Short Gain Test will not
prevent a fund from disposing of investments at a loss, since the recognition
of a loss before the expiration of the three-month holding period is
disregarded. Interest (including original issue discount) received by a fund at
maturity or upon the disposition of a security held for less than three months
will not be treated as gross income derived from the sale or other disposition
of a security within the meaning of the Short-Short Gain Test. However, income
that is attributable to realized market appreciation will be treated as gross
income from the sale or other disposition of securities for this purpose.
 
  In addition to satisfying the requirements described above, a regulated
investment company must satisfy an asset diversification test in order to
qualify for tax purposes as a regulated investment company. Under this 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. Government
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.
 
                                      A-19
<PAGE>
 
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). 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.
 
  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, 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 Fund that it is not
subject to backup withholding or that it is a corporation or other "exempt
recipient."
 

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 the
date of its Statement of Additional Information. 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 Fund.
 
                                      A-20
<PAGE>
 
INDEPENDENT 
AUDITORS' REPORT

                   To the Board of Directors and Shareholders
                   Short-Term Investments Co.:
 
                     We have audited the accompanying statement of assets and 
                   liabilities of the Prime Portfolio (a series Portfolio of 
                   Short-Term Investments Co.), including the schedule of 
                   investments, as of August 31, 1994, 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 ten-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, 1994 by correspondence with the custodian. An
                   audit also includes assessing the accounting principles used
                   and significant estimates made by management, as well as
                   evaluating the overall financial statement presentation. We
                   believe that our 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 Prime Portfolio as 
                   of August 31, 1994, 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 ten-year 
                   period then ended, in conformity with generally accepted
                   accounting principles.

 
                                             KPMG Peat Marwick LLP
 
                   Houston, Texas
                   October 7, 1994
 
                                      A-21
<PAGE>
 
SCHEDULE OF
INVESTMENTS
August 31, 1994

<TABLE>
<S>                               <C>                  <C>       <C>
                                        MATURITY       PAR (000)     VALUE
                                  ---------------------------------------------
COMMERCIAL PAPER, MASTER AND
 PROMISSORY NOTE AGREEMENTS - 81.70%(a)

BASIC INDUSTRIES - 2.83%

CHEMICALS - 0.74%

Hoechst Corp.
 4.40%...........................       09/02/94        $ 30,500 $   30,496,272
                                                                 --------------
MISCELLANEOUS - 2.09%

PHH Corp.
 4.50%........................... 09/07/94 to 09/13/94    85,878     85,775,467
                                                                 --------------
  Total Basic Industries.........                                   116,271,739
                                                                 --------------
CAPITAL GOODS - 3.35%

MACHINE TOOLS & RELATED PRODUCTS - 0.24%

Vermont American Corp.
 4.55%...........................       09/09/94          10,000      9,989,889
                                                                 --------------
MACHINERY - 3.11%

Dover Corp.
 4.50%...........................       09/07/94          17,000     16,987,250
 4.59%...........................       09/08/94          20,000     19,982,150
 4.80%........................... 09/09/94 to 09/13/94    51,000     50,926,400
 4.75%........................... 09/20/94 to 09/21/94    40,000     39,897,083
                                                                 --------------
                                                                    127,792,883
                                                                 --------------
  Total Capital Goods............                                   137,782,772
                                                                 --------------
CONSUMER DURABLES - 5.89%

AUTOMOBILE - 4.99%

Ford Motor Credit Co.
 4.50%........................... 09/12/94 to 09/15/94    62,840     62,737,530
 4.45%...........................       09/22/94          43,000     42,888,379
Toyota Motor Credit Corp.
 4.55%........................... 09/13/94 to 09/15/94   100,000     99,835,694
                                                                 --------------
                                                                    205,461,603
                                                                 --------------
RESIDENTIAL CONSTRUCTION - 0.90%

Weyerhaeuser Real Estate Co.
 4.50%...........................       09/13/94          37,000     36,944,500
                                                                 --------------
  Total Consumer Durables........                                   242,406,103
                                                                 --------------
CONSUMER NONDURABLES - 4.68%

BEVERAGES - 4.44%

Seagram (Joseph E.) & Sons, Inc.
 4.45%........................... 09/19/94 to 09/21/94    52,786     52,660,029
 4.55%........................... 09/19/94 to 09/20/94   100,345    100,110,396
Coca-Cola Co. (The)(b)
 4.70%...........................       12/20/94          30,000     30,000,000
                                                                 --------------
                                                                    182,770,425
                                                                 --------------
</TABLE>
 
                                      A-22
<PAGE>
 
<TABLE>
<S>                                <C>                  <C>       <C>
                                         MATURITY       PAR (000)    VALUE
                                   -------------------------------------------
FOOD PROCESSING - 0.24%

General Mills, Inc.
 4.55%............................       09/26/94        $ 10,000 $  9,968,403
                                                                  ------------
  Total Consumer Nondurables......                                 192,738,828
                                                                  ------------
CONSUMER SERVICES - 1.69%

MISCELLANEOUS - 1.69%

USL Capital Corp.
 4.80%............................       10/14/94          70,000   69,598,667
                                                                  ------------
  Total Consumer Services.........                                  69,598,667
                                                                  ------------
ENERGY - 3.90%

OIL & GAS - 3.63%

ARCO Coal Australia Inc.
 4.63%............................ 10/06/94 to 10/07/94    29,140   29,007,157
 4.64%............................ 10/06/94 to 10/07/94    51,391   51,154,545
 4.65%............................       10/06/94          24,578   24,466,887
 4.80%............................ 10/13/94 to 10/26/94    44,943   44,657,084
                                                                  ------------
                                                                   149,285,673
                                                                  ------------
NATURAL GAS - 0.27%

Colonial Pipeline Co.
 4.50%............................       09/08/94          11,000   10,990,375
                                                                  ------------
  Total Energy....................                                 160,276,048
                                                                  ------------
FINANCIAL - 56.59%

ASSET-BACKED SECURITIES - 19.13%

Asset Securitization Cooperative
 Corp.
 4.55%............................       09/14/94          50,000   49,917,847
 4.65%............................ 09/08/94 to 09/09/94   103,000  102,900,671
Ciesco, L.P.
 4.52%............................       09/19/94           9,200    9,179,208
 4.75%............................       09/21/94          20,000   19,947,222
 4.63%............................       10/06/94          15,000   14,932,479
 4.80%............................       10/14/94          25,000   24,856,816
Clipper Receivables Corp.
 4.50%............................ 09/07/94 to 09/09/94    75,094   75,022,680
 4.60%............................       09/15/94          36,368   36,302,942
 4.75%............................       09/21/94           9,988    9,961,643
Corporate Asset Funding Co. Inc.
 4.45%............................       09/20/94          20,000   19,953,028
 4.75%............................       09/29/94          30,000   29,889,167
Delaware Funding Corp.
 4.55%............................       09/12/94          11,973   11,956,354
 4.75%............................       09/19/94          32,279   32,202,337
 4.81%............................       10/17/94          16,619   16,516,858
</TABLE>
 
                                      A-23
<PAGE>
 
<TABLE>
<S>                                   <C>                  <C>       <C>
                                            MATURITY       PAR (000)     VALUE
                                      ---------------------------------------------
Preferred Receivables Funding Corp.
 4.65%...............................       09/12/94       $  19,475 $   19,447,329
 4.50%............................... 09/14/94 to 09/16/94    85,775     85,623,360
 4.55%...............................       09/14/94          21,500     21,464,674
 4.60%...............................       09/15/94          21,250     21,211,986
 4.53%...............................       09/16/94          16,375     16,344,092
 4.52%...............................       09/20/94          15,675     15,637,606
Sheffield Receivables Corp.
 4.80%............................... 10/21/94 to 10/28/94   155,000    153,892,000
                                                                     --------------
                                                                        787,160,299
                                                                     --------------
BANKING - 5.47%

Citicorp Securities Inc.(b)
 5.13%...............................       09/19/94          17,400     17,400,000
Morgan (J.P.) Securities, Inc.(c)
 5.08%...............................       01/19/95          90,350     90,350,000
 5.13%...............................       09/27/94         117,400    117,400,000
                                                                     --------------
                                                                        225,150,000
                                                                     --------------
BROKERAGE/INVESTMENT - 12.07%

Goldman, Sachs & Co.(d)
 3.69%...............................       10/31/94         150,000    150,000,000
Merrill Lynch & Co. Inc.
 4.50%...............................       10/03/94         100,000     99,600,000
Morgan Stanley Group Inc.(e)
 5.08%...............................       11/04/94         167,400    167,400,000
Smith Barney Inc.
 4.80%...............................       10/05/94          30,000     29,864,000
 4.84%...............................       10/14/94          50,000     49,710,943
                                                                     --------------
                                                                        496,574,943
                                                                     --------------
BUSINESS CREDIT - 3.33%

CIT Group Holdings, Inc.
 4.64%...............................       09/09/94          50,000     49,948,444
 4.65%...............................       09/12/94          45,000     44,936,063
National Rural Utilities Cooperative
 Finance Corp.
 4.62%............................... 10/04/94 to 10/07/94    42,300     42,117,010
                                                                     --------------
                                                                        137,001,517
                                                                     --------------
</TABLE>
 
                                      A-24
<PAGE>
 
<TABLE>
<S>                                <C>                  <C>       <C>
                                         MATURITY       PAR (000)     VALUE
                                   ---------------------------------------------
INSURANCE (LIFE) - 3.92%

Lincoln National Corp.
 4.65%...........................        10/04/94        $ 16,300 $   16,230,521
MetLife Funding, Inc.
 4.50%...........................        09/23/94          40,300     40,189,175
 4.62%...........................        10/07/94          30,000     29,861,400
The Prudential Home Mortgage Co.
 4.40%...........................        09/01/94          25,000     25,000,000
 4.55%...........................        09/23/94          50,000     49,860,972
                                                                  --------------
                                                                     161,142,068
                                                                  --------------
INSURANCE (OTHER) - 2.29%

Marsh & McLennan Companies, Inc.
 4.40%...........................  09/01/94 to 09/02/94    32,000     31,997,983
 4.60%...........................  09/07/94 to 09/16/94    62,500     62,417,392
                                                                  --------------
                                                                      94,415,375
                                                                  --------------
PERSONAL CREDIT - 5.32%

Associates Corp. of North America
 4.50%...........................        10/03/94          50,000     49,800,000
 4.65%...........................        10/04/94          50,000     49,786,875
AVCO Financial Services, Inc.
 4.52%...........................        09/30/94          35,000     34,872,561
 4.63%...........................        10/06/94          50,000     49,774,931
Transamerica Finance Corp.
 4.55%...........................        09/19/94          10,000      9,977,250
 4.62%...........................        10/07/94          25,000     24,884,500
                                                                  --------------
                                                                     219,096,117
                                                                  --------------
MISCELLANEOUS - 2.52%

International Lease Finance Corp.
 4.52%...........................        09/19/94          10,000      9,977,400
 4.50%...........................        09/23/94           9,050      9,025,113
 4.48%...........................        09/28/94          25,000     24,916,000
 4.79%...........................        10/14/94          50,000     49,713,931
USAA Capital Corp.
 4.68%...........................        09/08/94          10,000      9,990,900
                                                                  --------------
                                                                     103,623,344
                                                                  --------------
MULTIPLE INDUSTRY - 2.54%

American Express Co.
 4.75%...........................        09/22/94          20,000     19,944,583
American Express Credit Corp.
 4.52%...........................  09/16/94 to 09/30/94    85,000     84,708,084
                                                                  --------------
                                                                     104,652,667
                                                                  --------------
  Total Financial................                                  2,328,816,330
                                                                  --------------
</TABLE>
 
                                      A-25
<PAGE>
 
<TABLE>
<S>                                        <C>      <C>       <C>
                                           MATURITY PAR (000)     VALUE
                                           ------------------------------------
OTHER - 2.77%

BTR DUNLOP FINANCE INC. - 2.77%

 4.55%.................................... 09/26/94  $ 25,000 $   24,921,007
 4.64%.................................... 10/05/94    50,000     49,780,889
 4.80%.................................... 10/28/94    39,486     39,185,906
                                                              --------------
  Total Other.............................                       113,887,802
                                                              --------------
  Total Commercial Paper..................                     3,361,778,289
                                                              --------------
  Total Investments (excluding repurchase
   agreements) - 81.70%(f)................                    $3,361,778,289(g)
                                                              ==============
REPURCHASE AGREEMENTS(h) - 18.59%
BT Securities Corp.(i)
 4.83%....................................    --       50,000 $   50,000,000
Fuji Securities Inc.(j)
 4.90%....................................    --      250,000    250,000,000
Goldman, Sachs & Co.(k)
 4.83%.................................... 09/01/94   249,031    249,031,299
Kidder, Peabody & Co. Inc.(l)
 4.95%.................................... 09/01/94    30,000     30,000,000
Nikko Securities Co., Ltd.(m).............
 4.85%....................................             59,000     59,000,000
Prudential Securities Inc.(n)
 4.89%....................................    --       27,000     27,000,000
Sanwa - BGK Securities Co., L.P.(o)
 4.91%....................................    --      100,000    100,000,000
                                                              --------------
  Total Repurchase Agreements - 18.59%(f).                    $  765,031,299(g)
                                                              ==============
</TABLE>
(a) Some commercial paper is 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. Master and Promissory Note Agreement
    terms are described below.
(b) Master Note Purchase Agreement may be terminated by the Portfolio upon
    three business days' written or telephonic notice. Interest rates on master
    notes are redetermined periodically. Rates shown are the rates in effect on
    August 31, 1994.
(c) Master Note Purchase Agreements may be terminated by either party upon
    thirty business days written notice. Interest rates on master notes are
    redetermined periodically. Rates shown are the rates in effect on August
    31, 1994.
(d) Promissory Note Agreement may be terminated by the Portfolio upon seven
    calendar days oral notice. Interest rates on promissory notes are
    redetermined periodically. Rates shown are the rates in effect on August
    31, 1994.
(e) Master Note Purchase Agreement may be terminated by either party upon three
    business days' written or telephonic notice. Interest rates on master notes
    are redetermined periodically. Rates shown are the rates in effect on
    August 31, 1994.
(f) Percentage of Net Assets.
(g) Also represents cost for federal income tax purposes.
 
                                      A-26
<PAGE>
 
(h) Collateral on repurchase agreements, including the Portfolio's pro-rata
    interest in joint repurchase agreements, is taken into possession by the
    Fund upon entering into the repurchase agreement. The collateral is marked
    to market daily to ensure its market value as being 102 percent of the
    sales price of the repurchase agreement.
(i) Open repurchase agreement entered into 07/11/94; however, either party may
    terminate the agreement as of any business day not less than one business
    day after receipt of written notice from the terminating party. Interest
    rates are redetermined daily. Collateralized by $111,190,000 U.S. Treasury
    Obligations 0% to 7.625, due 11/30/95 to 08/15/15.
(j) Open repurchase agreement entered into 04/11/94; however, either party may
    terminate the agreement as of any business day not less than one business
    day after receipt of written notice from the terminating party. Interest
    rates are redetermined daily. Collateralized by $7,850,000 Federal Farm
    Credit Obligations, 0% to 8.95% due 09/01/94 to 11/21/03, $16,980,000
    Federal Home Loan Bank Board Obligations, 0% to 9.80% due 09/12/94 to
    05/18/99, $900,000 Federal Home Loan Mortgage Corp. Obligations, 5.19% to
    5.34% due 03/11/98 to 01/25/99, $19,555,000 Federal National Mortgage
    Association Obligations, 5.05% to 8.00% due 12/19/94 to 01/13/04,
    $65,865,000 Resolution Funding Corp. Obligations, 0% due 10/15/97 to
    10/15/23, $300,000 Student Loan Marketing Association Obligations, 0% due
    09/08/94, $8,565,000 Tennessee Valley Authority Obligations, 4.19% to 8.05%
    due 09/09/96 to 07/15/24 and $534,127,000 U.S. Treasury Obligations, 0% to
    11.75% due 11/17/94 to 02/15/23.
(k) Joint repurchase agreement entered into 08/31/94 with a maturing value of
    $554,131,782 with the Fund's pro-rata interest being $249,064,711.
    Collateralized by $562,755,000 U.S. Treasury Notes, 4.375% to 8.875% due
    05/15/95 to 01/15/00.
(l) Joint repurchase agreement entered into 08/31/94 with a maturing value of
    $100,013,750 with the Fund's pro-rata interest being $30,004,125.
    Collateralized by $67,395,988 Federal Home Loan Mortgage Corp. Obligations,
    0% to 4.676% due 03/15/24 to 09/01/24 and $44,414,254 Federal National
    Mortgage Association Obligations, 8.00% due 09/25/21.
(m) Open repurchase agreement entered into 04/14/94; however, either party may
    terminate the agreement as of any business day not less than one business
    day after receipt of written notice from the terminating party. Interest
    rates are redetermined daily. Collateralized by $143,760,000 U.S. Treasury
    Obligations, 0% to 6.50% due 03/09/95 to 04/30/99.
(n) Open repurchase agreement entered into 07/14/94; however, either party may
    terminate the agreement as of any business day not less than one business
    day after receipt of written notice from the terminating party. Interest
    rates are redetermined daily. Collateralized by $1,915,000 Federal Farm
    Credit Obligations, 0% to 8.65% due 09/01/94 to 04/01/02, $3,415,000
    Federal Home Loan Bank Board Obligations, 0% to 9.50% due 09/14/94 to
    07/19/04, $2,363,000 Federal Home Loan Mortgage Association Obligations, 0%
    to 8.125% due 11/30/94 to 11/29/19, $3,045,000 Federal National Mortgage
    Association Obligations, 4.875% to 11.70% due 09/10/94 to 07/14/04,
    $483,000 Financing Corp. Obligations, 0% to 10.70% due 11/30/94 to
    08/03/18, $8,841,000 Resolution Funding Corp. Obligations, 0% to 9.375% due
    10/15/95 to 04/15/30, $445,000 Student Loan Marketing Association
    Obligations, 0% to 10.50% due 09/10/94 to 04/16/96, $1,171,000 Tennessee
    Valley Authority Obligations, 4.375% to 8.625% due 10/01/94 to 06/15/44,
    and $25,506,875 U.S. Treasury Obligations, 0% to 13.375% due 09/30/94 to
    08/15/23.
(o) Open repurchase agreement entered into 05/19/94; however, either party may
    terminate the agreement as of any business day not less than one business
    day after receipt of written notice from the terminating party. Interest
    rates are redetermined daily. Collateralized by $108,827,105 Government
    National Mortgage Association Obligations, 5.00% to 7.00% due 11/20/22 to
    08/20/24. 

See Notes to Financial Statements.
 
                                      A-27
<PAGE>
 
STATEMENT
OF ASSETS
AND LIABILITIES
August 31, 1994

<TABLE>
<S>                                                              <C>
ASSETS:

Investments, excluding repurchase agreements, at value
 (amortized cost)............................................... $3,361,778,289
Repurchase agreements...........................................    765,031,299
Interest receivable.............................................      4,867,772
Investment for deferred compensation plan.......................         14,881
Other assets....................................................        258,635
                                                                 --------------
  Total assets..................................................  4,131,950,876
                                                                 --------------
LIABILITIES:

Dividends payable...............................................     16,744,999
Deferred compensation payable...................................         14,881
Accrued advisory fees...........................................        165,682
Accrued distribution fees.......................................          4,807
Accrued printing expenses.......................................          5,536
Accrued operating expenses......................................          1,620
                                                                 --------------
  Total liabilities.............................................     16,937,525
                                                                 --------------
NET ASSETS...................................................... $4,115,013,351
                                                                 ==============
NET ASSET VALUE PER SHARE:

Capital shares, $0.001 par value per share...................... $4,115,025,404
                                                                 ==============
Net asset value, offering and redemption price per share........          $1.00
                                                                          =====
</TABLE>
 
See Notes to Financial Statements.
 
                                      A-28
<PAGE>
 
STATEMENT OF
OPERATIONS
For the year ended
August 31, 1994
 
<TABLE>
<S>                                                                <C>
INVESTMENT INCOME:

Interest income................................................... $159,273,989
                                                                   ------------
EXPENSES:

Advisory fees.....................................................    2,599,662
Custodian fees....................................................      233,785
Administrative service fees.......................................      120,760
Directors' fees and expenses......................................       37,943
Transfer agent fees...............................................       29,699
Professional fees.................................................      137,285
Printing expenses.................................................       56,163
Registration and filing fees......................................      158,557
Distribution fees (Note 2)........................................       36,698
Other.............................................................      135,578
                                                                   ------------
  Total expenses..................................................    3,546,130
Less expenses assumed by advisor..................................     (104,200)
                                                                   ------------
  Net expenses....................................................    3,441,930
                                                                   ------------
Net investment income.............................................  155,832,059
                                                                   ------------
Net increase in net assets resulting from operations.............. $155,832,059
                                                                   ============
</TABLE>
 
STATEMENT
OF CHANGES
IN NET ASSETS
For the years ended
August 31, 1994 and 1993 
 
<TABLE>
<CAPTION>
                                                                       1994            1993
                                                                   --------------  --------------
<S>                                                                <C>             <C>
OPERATIONS:

 Net investment income...........................................  $  155,832,059  $  140,216,467
 Net realized gain (loss) on sales of investments................              --          (4,456)
                                                                   --------------  --------------
 Net increase in net assets resulting from operations............     155,832,059     140,212,011
 Distributions to shareholders from net investment income........    (155,832,059)   (140,216,467)
 Share transactions -- net.......................................    (253,692,887)    374,643,259
                                                                   --------------  --------------
 Net increase (decrease) in net assets...........................    (253,692,887)    374,638,803

NET ASSETS:

 Beginning of period.............................................   4,368,706,238   3,994,067,435
                                                                  --------------  --------------
 End of period...................................................  $4,115,013,351  $4,368,706,238
                                                                   ==============  ==============
NET ASSETS CONSIST OF:

 Capital (par value and additional paid-in)....................... $4,115,025,404  $4,368,718,291
 Undistributed net realized gain (loss) on sales of investments...        (12,053)        (12,053)
                                                                   --------------  --------------
                                                                   $4,115,013,351  $4,368,706,238
                                                                   ==============  ==============
</TABLE>
  
See Notes to Financial Statements.
 
                                      A-29
<PAGE>
 
NOTES TO
FINANCIAL
STATEMENTS
August 31, 1994

NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES

  Short-Term Investments Co. (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 Maryland corporation consisting
of two different portfolios, the Prime Portfolio which offers separate classes
of shares and the Liquid Assets Portfolio. Information presented in these
financial statements pertains only to the Prime Portfolio (the "Portfolio").
The assets, liabilities and operations of each Portfolio are accounted for
separately. The Portfolio consists of four different classes of shares: the
Institutional Class, the Private Investment Class, the Personal Investment
Class, and the Cash Management Class.
  The following is a summary of the significant accounting policies followed by
the Portfolio in the preparation of its financial statements.
A. Security Valuations - The Portfolio invests only in securities which have
   maturities of sixty 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 - Operating expenses directly attributable to a specific class of
   shares are charged to that class' operations. Expenses which are applicable
   to all classes, e.g. advisory fees, are allocated among them. Expenses of
   the Fund which are not directly attributable to a specific class are
   prorated among the classes to which the expense relates based on the
   relative net assets of each class.
 
                                      A-30
<PAGE>
 
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>
<CAPTION>
Net Assets                                                                  Rate
- --------------------------------------------------------------------------- ----
<S>                                                                         <C>
First $100 million......................................................... .20%
Over $100 million to $200 million.......................................... .15%
Over $200 million to $300 million.......................................... .10%
Over $300 million to $1.5 billion.......................................... .06%
Over $1.5 billion.......................................................... .05%
</TABLE>
 
  AIM will, if necessary, reduce its fee for any fiscal year to the extent
required so that the amount of ordinary expenses of the Portfolio (excluding
interest, taxes, brokerage commissions and extraordinary expenses) paid or
incurred by the Portfolio for such fiscal year does not exceed the applicable
expense limitations imposed by the state securities regulations in any state in
which the Portfolio's shares are qualified for sale. AIM voluntarily reimbursed
expenses of $76,000 on the Prime Portfolio-Private Investment Class, $22,400 on
the Prime Portfolio-Personal Investment Class and $5,800 on the Prime
Portfolio-Cash Management Class during the year ended August 31, 1994.
  The Portfolio, pursuant to a master administrative services agreement with
AIM, has agreed to reimburse AIM for certain costs incurred in providing
accounting and shareholder services to the Portfolio. During the year ended
August 31, 1994, the Portfolio reimbursed AIM $120,760 for such services.
  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, Personal Investment Class and the Cash Management Class of
the Portfolio. The Plan provides that the Portfolio's Private Investment Class,
Personal Investment Class and the Cash Management Class may pay up to a 0.50%,
0.75% and 0.10%, 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 and (b) 0.10% of the average daily net assets of the
Cash Management 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 or the Cash Management Class. Any amounts not paid as
a service fee under such Plan would constitute an asset-based sales charge.
During the year ended August 31, 1994, the Prime Portfolio-Private Investment
Class, the Prime Portfolio-Personal Investment Class and Prime Portfolio-Cash
Management Class accrued for compensation to FMC of $28,599, $7,190 and $909,
respectively, under the Plan. Certain officers and directors of the Fund are
officers of AIM and FMC.
  The Fund paid legal fees of $28,323 for services rendered by Reid & Priest as
counsel to the Board of Directors. In September 1994, Kramer, Levin, Naftalis,
Nessen, Kamin & Frankel was appointed as counsel to the Board of Directors. A
member of that firm is a director of the Fund.
 
                                      A-31
<PAGE>
 
NOTE 3 - DIRECTORS' FEES

  Directors' fees represent remuneration paid or accrued to each director who is
not an "interested person" of the Fund. The Fund invests directors' fees, if so
elected by a director, in mutual fund shares in accordance with a deferred
compensation plan.
 
NOTE 4 - SHARE INFORMATION

  As of August 31, 1994, shares outstanding of the Prime Portfolio are:
Institutional Class -4,080,754,461, Private Investment Class - 30,833,786,
Personal Investment Class - 3,065,133 and Cash Management Class - 372,024.
Changes in shares outstanding during the years ended August 31, 1994 and 1993
were as follows:
 
<TABLE>
<CAPTION>
                                                            1994                                   1993
                                              ----------------------------------    -----------------------------------
                                                  Shares              Amount             Shares              Amount
                                              --------------    ----------------    ---------------    ----------------
<S>                                           <C>               <C>                 <C>                <C>
PRIME PORTFOLIO:
Sold:
  Institutional Class......................   33,826,759,958    $ 33,826,759,958     24,999,540,725    $ 24,999,540,725
  Private Investment Class.................      120,927,192         120,927,192         27,239,367          27,239,367
  Personal Investment Class................       15,823,134          15,823,134          2,231,787           2,231,787
  Cash Management Class*...................       25,113,434          25,113,434                 --                  --
Issued as reinvestment of dividends:
  Institutional Class......................          527,557             527,557            930,552             930,552
  Private Investment Class.................            3,982               3,982                  4                   4
  Personal Investment Class................           39,701              39,701             18,538              18,538
  Cash Management Class*...................            5,586               5,586                 --                  --
Reacquired:
  Institutional Class......................  (34,096,489,905)    (34,096,489,905)   (24,643,862,582)    (24,643,862,582)
  Private Investment Class.................     (107,954,443)       (107,954,443)        (9,382,421)         (9,382,421)
  Personal Investment Class................      (13,702,087)        (13,702,087)        (2,072,711)         (2,072,711)
  Cash Management Class*...................      (24,746,996)        (24,746,996)                --                  --
                                              ---------------    ----------------    ---------------    ----------------
Net increase (decrease).....................     (253,692,887)   $   (253,692,887)       374,643,259    $    374,643,259
                                              ===============    ================    ===============    ================
</TABLE>
 
* The Prime Portfolio Cash Management Class commenced operations on June 30,
1994.
 
                                      A-32
<PAGE>
 
NOTE 5 - FINANCIAL HIGHLIGHTS

  Shown below are the condensed financial highlights for a share outstanding of
the Prime Portfolio-Institutional Class during each of the years in the ten-
year period ended August 31, 1994.
 
<TABLE>
<CAPTION>
                                                      1994            1993           1992           1991           1990     
                                                   -----------     -----------     ----------     ----------     -----------  
<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...........................         0.036          0.031          0.043          0.069          0.084 
                                                     ----------     ----------     ----------     ----------     ----------  
 Total from investment operations................         0.036          0.031          0.043          0.069          0.084       
                                                     ----------     ----------     ----------     ----------     ----------  
Less distributions:
 Dividends from net investment income............        (0.036)        (0.031)        (0.043)        (0.069)        (0.084)     
                                                     ----------     ----------     ----------     ----------     ----------  
Net asset value, end of period...................         $1.00          $1.00          $1.00          $1.00          $1.00       
                                                     ==========     ==========     ==========     ==========     ==========  
Total return.....................................          3.64%          3.20%          4.44%          7.11%          8.72%       
                                                     ==========     ==========     ==========     ==========     ==========  
Ratios/supplemental data:
Net assets, end of period
 (000s omitted)..................................    $4,080,753     $4,349,945     $3,993,340     $6,108,991     $6,475,123  
                                                     ==========     ==========     ==========     ==========     ==========  
Ratio of expenses to average net assets..........          0.08%(a)       0.07%          0.08%          0.07%          0.07%       
                                                     ==========     ==========     ==========     ==========     ==========  
Ratio of net investment income to average net
 assets..........................................          3.58%(a)       3.15%          4.43%          6.89%          8.39%       
                                                     ==========     ==========     ==========     ==========     ==========  
<CAPTION>
                                                        1989           1988           1987           1986           1985
                                                     ----------     ----------     ----------     ----------     ----------
<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...........................         0.090          0.071          0.062          0.074          0.089
                                                     ----------     ----------     ----------     ----------     ----------
 Total from investment operations................         0.090          0.071          0.062          0.074          0.089
                                                     ----------     ----------     ----------     ----------     ----------
Less distributions:
 Dividends from net investment income............        (0.090)        (0.071)        (0.062)        (0.074)        (0.089)
                                                     ----------     ----------     ----------     ----------     ----------
Net asset value, end of period...................         $1.00          $1.00          $1.00          $1.00          $1.00
                                                     ==========     ==========     ==========     ==========     ========== 
Total return.....................................          9.42%          7.34%          6.39%          7.62%          9.23%
                                                     ==========     ==========     ==========     ==========     ========== 
Ratios/supplemental data:
Net assets, end of period
 (000s omitted)..................................    $7,003,546     $5,841,901     $4,822,758     $4,237,113     $3,840,217
                                                     ==========     ==========     ==========     ==========     ========== 
Ratio of expenses to average net assets..........          0.08%          0.09%          0.08%          0.08%          0.09%
                                                     ==========     ==========     ==========     ==========     ========== 
Ratio of net investment income to average net
 assets..........................................          9.07%          7.11%          6.22%          7.36%          8.83%
                                                     ==========     ==========     ==========     ==========     ========== 
</TABLE>
(a)Ratios are based on average net assets of $4,347,222,760.
 
                                      A-33
<PAGE>
  
                      [THIS PAGE INTENTIONALLY LEFT BLANK]
 
<PAGE>
 
=======================================  =======================================
                                                                                
SHORT-TERM INVESTMENTS CO.                                                      
11 Greenway Plaza, Suite 1919                          PROSPECTUS               
Houston, Texas 77046-1173                                                       
(800) 659-1005                                                                  
                                                    December 30, 1994           
                                                                                
INVESTMENT ADVISOR                                                              
A I M ADVISORS, INC.                                   SHORT-TERM               
11 Greenway Plaza, Suite 1919                        INVESTMENTS CO.            
Houston, Texas                                                                  
(713) 626-191                                         ------------              
                                                                                
                                                     PRIME PORTFOLIO            
DISTRIBUTOR                                                                     
FUND MANAGEMENT COMPANY                               ------------              
11 Greenway Plaza, Suite 1919                                                   
Houston, Texas 77046-1173                          INSTITUTIONAL CLASS          
(800) 659-1005                                                                  
                                                                                
                                                    TABLE OF CONTENTS           
AUDITORS                                                                        
KPMG PEAT MARWICK LLP                    <TABLE>                                
NationsBank Building                     <CAPTION>                              
700 Louisiana                                                               PAGE
Houston, Texas 77002                                                        ----
                                         <S>                                <C> 
                                         SUMMARY............................   2
CUSTODIAN                                                                       
THE BANK OF NEW YORK                     TABLE OF FEES AND EXPENSES.........   4
110 Washington Street                                                           
8th Floor                                FINANCIAL HIGHLIGHTS...............   5
New York, New York 10286                                                        
                                         SUITABILITY FOR INVESTORS..........   6
                                                                                
TRANSFER AGENTS                          INVESTMENT PROGRAM.................   6
STATE STREET BANK AND TRUST COMPANY                                             
225 Franklin Street                      PURCHASE OF SHARES.................  10
Boston, Massachusetts 02110                                                     
                                         REDEMPTION OF SHARES...............  11
                                                                                
A I M INSTITUTIONAL FUND SERVICES, INC.  DIVIDENDS..........................  11
11 Greenway Plaza, Suite 1919                                                   
Houston, Texas 77046-1173                TAXES..............................  12
                                                                                
NO PERSON HAS BEEN AUTHORIZED TO GIVE    NET ASSET VALUE....................  12
ANY INFORMATION OR TO MAKE ANY                                                  
REPRESENTATIONS NOT CONTAINED IN THIS    YIELD INFORMATION..................  13
PROSPECTUS IN CONNECTION WITH THE                                               
OFFERING MADE BY THIS PROSPECTUS, AND    REPORTS TO SHAREHOLDERS............  13
IF GIVEN OR MADE, SUCH INFORMATION OR                                           
REPRESENTATIONS MUST NOT BE RELIED       MANAGEMENT OF THE FUND.............  13
UPON AS HAVING BEEN AUTHORIZED BY THE                                           
FUND OR THE DISTRIBUTOR. THIS PROSPEC-   GENERAL INFORMATION................  13
TUS DOES NOT CONSTITUTE AN OFFER IN ANY                                         
JURISDICTION TO ANY PERSON TO WHOM SUCH  APPENDIX........................... A-1
OFFERING MAY NOT LAWFULLY BE MADE.       </TABLE>                               
                                                                                
=======================================  =======================================



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