SHORT TERM INVESTMENTS CO /TX/
497, 1997-12-18
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<S>                        <C>
SHORT-TERM
INVESTMENTS CO.
                           Prospectus
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LIQUID ASSETS                The Liquid Assets Portfolio (the "Portfolio") is a money market fund whose
PORTFOLIO                  investment objective is to provide as high a level of current income as is consistent        
                           with the preservation of capital and liquidity. The Portfolio seeks to achieve   
PRIVATE                    its objective by investing in high quality money market instruments such              
INVESTMENT                 as U.S. Government obligations, bank obligations, commercial instruments and 
CLASS                      repurchase agreements.

DECEMBER 17, 1997            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 Private Investment Class of the Portfolio, a class    
                           of shares designed to be a convenient and economical vehicle in which institutions
                           can invest short-term cash reserves.

                             THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND    
                           EXCHANGE COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION PASSED UPON    
                           THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY   
                           IS A CRIMINAL OFFENSE.                                                            
                                                                                                             
                             THIS PROSPECTUS SETS FORTH BASIC INFORMATION THAT A PROSPECTIVE INVESTOR        
                           SHOULD KNOW BEFORE INVESTING IN SHARES OF THE PRIVATE INVESTMENT CLASS OF THE    
                           PORTFOLIO AND SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE. A STATEMENT OF    
                           ADDITIONAL INFORMATION DATED DECEMBER 17, 1997, HAS BEEN FILED WITH THE UNITED   
                           STATES SECURITIES AND EXCHANGE COMMISSION (THE "SEC") AND IS HEREBY               
                           INCORPORATED BY REFERENCE. FOR A COPY OF THE STATEMENT OF ADDITIONAL INFORMATION
                           WITHOUT CHARGE, WRITE TO THE ADDRESS BELOW OR CALL (800) 877-7748. THE SEC MAINTAINS
                           A WEB SITE AT HTTP://WWW.SEC.GOV THAT CONTAINS THE STATEMENT OF ADDITIONAL INFORMATION,
                           MATERIAL INCORPORATED BY REFERENCE, AND OTHER INFORMATION REGARDING THE FUND.
                                                                                                             
                             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      
[LOGO APPEARS HERE]        SHARE. SHARES OF THE PORTFOLIO INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE   
Fund Management Company    LOSS OF PRINCIPAL.                                                                 

11 Greenway Plaza        
Suite 100 
Houston, TX 77046-1173   
(800) 877-7748           
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                                    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 Private Investment
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 Agencies obligations, bank obligations, commercial instruments and
repurchase agreements. The investment objective of the Portfolio is to provide
as high a level of current income as is consistent with the preservation of
capital and liquidity.

  Pursuant to separate prospectuses, the Fund also offers shares of other
classes of common stock of the Fund representing interests in the Portfolio:
the Institutional Class, the Cash Management Class and the MSTC Cash Reserves
Class. Such classes have different distribution arrangements and are designed
for institutional and other categories of investors. The Fund also offers
shares of classes of another portfolio, the Prime Portfolio, each pursuant to a
separate prospectus. Such classes have different distribution arrangements and
are designed for institutional and other categories of investors. The
portfolios of the Fund are referred to collectively as "Portfolios." 
 
INVESTORS IN THE CLASS
 
  The Class is designed to be a convenient and economical vehicle in which
institutions, particularly banks, acting for themselves or in a fiduciary,
advisory, agency, custodial or other similar capacity, can invest short-term
cash reserves. Although shares of the Class may not be purchased by individuals
directly, institutions may purchase shares for accounts maintained for
individuals. See "Suitability for Investors."
 
PURCHASE OF SHARES
 
  Shares of the Class are sold at net asset value without a sales charge. The
minimum initial investment in the Class is $10,000. There is no minimum amount
for subsequent investments. Payment for shares of the Class purchased must be
in federal funds or other funds immediately available to the Portfolio. See
"Purchase of Shares."
 
REDEMPTION OF SHARES
 
  Redemptions may be made without charge at net asset value. Payment for
redeemed shares of the Class for which redemption orders have been received
prior to 4:00 p.m. Eastern Time will normally be made in federal funds on the
same day. See "Redemption of Shares."
 
DIVIDENDS
 
  The net income of the Portfolio is declared as a dividend daily to
shareholders of record immediately after 4:00 p.m. Eastern Time. Dividends are
paid monthly by check or wire transfer unless the shareholder has previously
elected to have such dividends automatically reinvested in additional shares of
the Class. Information concerning the amount of the dividends declared on any
particular day will normally be available by 5:00 p.m. Eastern Time on that
day. See "Dividends."
 
CONSTANT NET ASSET VALUE
 
  The Portfolio uses the amortized cost method of valuing its portfolio
securities and rounds its per share net asset value to the nearest whole cent.
Accordingly, the Fund intends to maintain the net asset value per share of the
Portfolio 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 OF $1.00 PER SHARE. See "Net Asset
Value."
 
INVESTMENT ADVISOR

  A I M Advisors, Inc. ("AIM") serves as the Portfolio's investment advisor and
receives a fee based on the Portfolio's average daily net assets. AIM is
primarily engaged in the business of acting as manager or advisor to investment
companies. Under a 
 
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Master 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." Under a Transfer Agency and Service Agreement, A I M
Institutional Fund Services, Inc. ("Transfer Agent"), AIM's wholly owned
subsidiary and a registered transfer agent, receives a fee for its provision of
transfer agency, dividend distribution and disbursement, and shareholder
services to the Fund. It is currently anticipated that, effective on or about
December 29, 1997, A I M Fund Services, Inc. ("Transfer Agent"), a wholly owned
subsidiary of AIM and registered transfer agent, will become the transfer agent
to the Fund. See "General Information--Transfer Agent and Custodian." 
 
DISTRIBUTOR AND DISTRIBUTION PLAN

  Fund Management Company ("FMC") acts as the exclusive distributor of the
shares of the Class. Pursuant to the Master Distribution Plan, the Fund may pay
up to .50% of the average daily net assets of the Portfolio attributable to the
shares of the Class to FMC as well as certain broker-dealers or other financial
institutions as compensation for distribution-related services. See "Purchase
of Shares" and "Management of the Fund--Distribution Plan." 
 
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
foreign 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.
There can be no assurance that the Portfolio will be able to maintain a stable
net asset value of $1.00 per share. See "Investment Program."

  The AIM Family of Funds, The AIM Family of Funds and Design (i.e., the AIM
logo), AIM and Design, AIM, AIM LINK, AIM Institutional Funds, La Familia AIM
de Fondos and La Familia AIM de Fondos and Design are registered service marks
and aimfunds.com and Invest With Discipline are service marks of A I M
Management Group Inc. 
 
                                       3
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                           TABLE OF FEES AND EXPENSES
 
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<S>                                                                      <C>
SHAREHOLDER TRANSACTION EXPENSES--PRIVATE INVESTMENT CLASS*
 Maximum Sales Load Imposed on Purchases (as a percentage of offering
  price)...............................................................  None
 Maximum Sales Load Imposed 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 (AS A PERCENTAGE OF AVERAGE NET AS-
 SETS)--PRIVATE INVESTMENT CLASS
 Management Fees (after waivers).......................................  0.04%**
 12b-1 Fees (after waivers)***.........................................  0.30%**
 Other Expenses........................................................  0.02%
                                                                         ----
 Total Operating Expenses--Private Investment Class....................  0.36%
                                                                         ====
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* Beneficial owners of shares of the Class should consider the effect of any
  charges imposed by their bank or other financial institution for various
  services.
** The fees and expenses set forth in the tables are based on average net
   assets of the Class' and current fee waivers. Had there been no waivers,
   Management Fees, 12b-1 Fees and Total Operating Expenses would be 0.15%,
   0.50% and 0.68% respectively. 
*** As a result of 12b-1 fees, a long-term shareholder of the Class may pay
    more than the economic equivalent of the maximum front-end sales charges
    permitted by the Rules of the National Association of Securities Dealers,
    Inc.
 
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.
 
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      1 year........................................................... $ 4
      3 years.......................................................... $12
      5 years.......................................................... $20
      10 years......................................................... $46
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  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.) Expenses have been
restated to reflect current fee waivers. To the extent any service providers
assume expenses of the Class, such assumption of expenses 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--Private Investment Class" remain the same in the
years shown.
 
  THE EXAMPLE SHOULD NOT BE CONSIDERED TO BE AN ACCURATE REPRESENTATION OF PAST
OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
 
                                       4
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                              FINANCIAL HIGHLIGHTS

  Shown below are the per share data, ratios and supplemental data
(collectively, "data") during the year ended August 31, 1997 and for the period
February 16, 1996 (date operations commenced) through August 31, 1996. 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. 
 
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                                                              FEBRUARY 16, 1996
                                                                (COMMENCEMENT
                                                              OF OPERATIONS) TO
                                                   1997        AUGUST 31, 1996
                                                  -------     -----------------
<S>                                               <C>         <C>
Net asset value, beginning of period............. $  1.00          $  1.00
Income from investment operations:
  Net investment income..........................    0.05             0.03
                                                  -------          -------
Less distributions:
  Dividends from net investment income...........   (0.05)           (0.03)
                                                  -------          -------
Net asset value, end of period................... $  1.00          $  1.00
                                                  =======          =======
Total return.....................................    5.27%            5.10%(a)
                                                  =======          =======
Ratios/supplemental data:
Net assets, end of period (000s omitted)......... $70,856          $44,981
                                                  =======          =======
Ratio of expenses to average net assets(b) ......    0.36%(c)         0.32%(a)
                                                  =======          =======
Ratio of net investment income to average net
 assets(d) ......................................    5.16%(c)         5.04%(a)
                                                  =======          =======
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(a) Annualized.
(b) After fee waivers and/or expense reimbursements. Ratios of expenses to
    average net assets prior to fee waivers and/or expense reimbursements were
    0.68% and 0.69% (annualized), for the periods 1997-1996, respectively. 
(c) Ratios are based on average net assets of $56,842,586. 
(d) After fee waivers and/or expense reimbursements. Ratios of net investment
    income to average net assets prior to fee waivers and/or expense
    reimbursements were 4.84% and 4.67% (annualized), for the periods 1997-
    1996, respectively.
 
                           SUITABILITY FOR INVESTORS

  The Class is intended for use primarily by customers of banks, certain
broker-dealers and other financial institutions who seek a convenient vehicle
in which to invest in an open-end diversified money market fund. The minimum
initial investment is $10,000. 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. 

  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. It is anticipated that most investors will
perform their own sub-accounting; however, sub-accounting services may be
arranged through the Fund for shareholders who prefer not to perform such
services. 
 
                               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.
 
 
                                       5
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INVESTMENT OBJECTIVE
 
  The investment objective of the Portfolio is to provide as high a level of
current income as is consistent with the preservation of capital and liquidity.
The Portfolio seeks to achieve its objective by investing in a diversified
portfolio of high quality U.S. dollar-denominated money market instruments and
other similar instruments with maturities of 397 days or less from the date of
purchase. The Portfolio will maintain a weighted average maturity of 90 days or
less.
 
INVESTMENT POLICIES

  The Portfolio may invest in a broad range of U.S. Government and foreign
government obligations, taxable municipal securities, and bank and commercial
instruments that may be available in the money markets. Such obligations
include U.S. Treasury obligations and repurchase agreements. The Portfolio may
invest in bankers' acceptances, certificates of deposit, time deposits and
commercial paper, and U.S. Government direct obligations and U.S. Government
agencies securities. Certain U.S. Government obligations with floating or
variable interest rates may have longer maturities. Commercial obligations may
include both domestic and foreign issuers that are U.S. dollar-denominated.
Bankers' acceptances, certificates of deposit and time deposits may be
purchased from U.S. or foreign banks. These instruments, which are collectively
referred to as "Money Market Obligations," are briefly described below. 

  The Portfolio will limit investments in Money Market Obligations to those
which 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 ("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 Fund's Board of
Directors) to be of comparable quality to a rated security that meets the
foregoing quality standards. 
 
  The Portfolio will not invest more than 10% of its net assets in illiquid
securities.

  The Portfolio may invest in other investment companies to the extent
permitted by the 1940 Act, and rules and regulations thereunder, and, if
applicable, exemptive orders granted by the SEC. 

  In managing the Portfolio's investments, AIM may indicate to dealers or
issuers its interest in acquiring certain securities for the Portfolio for
settlement beyond a customary settlement date thereafter. In some cases, the
Portfolio may agree to purchase such securities at stated prices and yields.
(In such cases, these securities are considered "delayed delivery" securities
when traded in the secondary market or "when-issued" securities if they are an
initial issuance of securities.) Since this is done to facilitate the
acquisition of portfolio securities and is not for the purpose of investment
leverage, the amount of delayed delivery or when-issued securities involved may
not exceed the estimated amount of funds available for investment on the
settlement date. Until the settlement date, liquid assets of the Portfolio with
a dollar value sufficient at all times to make payment for the delayed delivery
or when-issued securities will be set aside in a segregated account. (The total
amount of liquid assets in the segregated account may not exceed 25% of the
Portfolio's total assets.) The delayed delivery securities, which will not
begin to accrue interest until the settlement date, and the when-issued
securities will be recorded as an asset of the Portfolio and will be subject to
the risks of market value fluctuations. The purchase price of the delayed
delivery or when-issued securities will be recorded as a liability of the
Portfolio until settlement. AIM may also transact sales of securities on a
"forward commitment" basis. In such a transaction, AIM agrees to sell portfolio
securities at a future date at specified prices and yields. Securities subject
to sale on a forward commitment basis will continue to accrue interest until
sold and will be subject to the risks of market value fluctuations. Absent
extraordinary circumstances, the Portfolio's right to acquire delayed delivery
and when-issued securities or its obligation to sell securities on a forward-
commitment basis will not be divested prior to the settlement date. 
 
  The Portfolio may invest up to 100% of its total assets in obligations issued
by banks. While the Portfolio will limit its investments in bank instruments to
U.S.dollar-denominated obligations, it may invest in Eurodollar obligations
(i.e., U.S. dollar-denominated obligations issued by a foreign branch of a
domestic bank), Yankee dollar obligations (i.e., U.S. dollar-denominated
obligations issued by a domestic branch of a foreign bank) and obligations of
foreign branches of foreign banks, including time deposits. The Portfolio will
limit its aggregate investments in foreign bank obligations, including
Eurodollar obligations and Yankee dollar obligations, to 25% of its total
assets at the time of purchase, provided that there is no limitation upon the
Portfolio's investments in (a) Eurodollar obligations, if the domestic parent
of the foreign branch issuing the obligation is unconditionally liable in the
event that the foreign branch for any reason fails to pay on the Eurodollar
obligation; and (b) Yankee dollar obligations, if the U.S. branch of the
foreign bank is subject to the same regulation as U.S. banks.
 
 
                                       6
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  The Portfolio may invest in certificates of deposit ("Eurodollar CDs") and
time deposits ("Eurodollar time deposits") of foreign branches of domestic
banks having total assets of $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 foreign country 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.
 
  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.
 
DESCRIPTION OF MONEY MARKET OBLIGATIONS
 
  The following list does not purport to be an exhaustive list of all Money
Market Obligations, and the Portfolio reserves the right to invest in Money
Market Obligations other than those listed below:
 
  U.S. GOVERNMENT DIRECT OBLIGATIONS--These are bills, notes, and bonds issued
by the U.S. Treasury.
 
  U.S. GOVERNMENT AGENCIES SECURITIES--Certain federal agencies (such as the
Federal National Mortgage Association, the Small Business Administration and
the Resolution Trust Corporation) have been established as instrumentalities of
the U.S. Government to supervise and finance certain types of activities.
Issues of these agencies, while not direct obligations of the U.S. Government,
are (a) backed by the full faith and credit of the United States, (b)
guaranteed by the U.S. Treasury or (c) supported by the issuing agencies' right
to borrow from the U.S. Treasury.
 
  FOREIGN GOVERNMENT OBLIGATIONS--These are U.S. dollar-denominated obligations
issued or guaranteed by one or more foreign governments or any of their
political subdivisions, agencies or instrumentalities that are determined by
AIM to be of comparable quality to the other obligations in which the Portfolio
may invest. These obligations are often, but not always, supported by the full
faith and credit of the foreign governments, or their subdivisions, agencies or
instrumentalities, that issue them. Such securities also include debt
obligations of supranational entities. Such debt obligations are ordinarily
backed by the full faith and credit of the entities that issue them.
Supranational entities include international organizations designated or
supported by governmental entities to promote economic reconstruction or
development and international banking institutions and related government
agencies. Examples of supranational entities include the International Bank for
Reconstruction and Development (the World Bank), the European Coal and Steel
Community, the Asian Development Bank and the InterAmerican Development Bank.
The percentage of the Portfolio's assets invested in securities issued by
foreign governments will vary depending on the relative yields of such
securities, the economic and financial markets of the countries in which the
investments are made and the interest rate climate of such countries.
 
  BANKERS' ACCEPTANCES--A bankers' acceptance is a bill of exchange or time
draft drawn on and accepted by a commercial bank. Bankers' acceptances are used
by corporations to finance the shipment and storage of goods and to furnish
dollar exchange. These instruments generally mature in six months or less.
 
  CERTIFICATES OF DEPOSIT--A certificate of deposit is a negotiable interest-
bearing instrument with a specific maturity. Certificates of deposit are issued
by banks and savings and loan institutions in exchange for the deposit of
funds, and normally can be traded in the secondary market prior to maturity.
 
  TIME DEPOSITS--A time deposit is a non-negotiable receipt issued by a bank in
exchange for the deposit of funds. Like a certificate of deposit, it earns a
specified rate of interest over a definite period of time; however, it cannot
be traded in the secondary market.
 
 
                                       7
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  EURODOLLAR OBLIGATIONS--A Eurodollar obligation is a U.S. dollar-denominated
obligation issued by a foreign branch of a domestic bank.
 
  YANKEE DOLLAR OBLIGATIONS--A Yankee dollar obligation is a U.S. dollar-
denominated obligation issued by a domestic branch of a foreign bank.
 
  SHORT AND MEDIUM TERM NOTES--Short and medium term notes are obligations that
have fixed coupons and maturities that can be targeted to meet investor
requirements. They are issued in the capital markets either publicly under a
shelf registration pursuant to Rule 415 promulgated by the SEC, or privately
without such a registration.
 
  COMMERCIAL PAPER--Commercial paper is a term used to designate unsecured
short-term promissory notes issued by corporations and other entities.
Maturities on these issues vary from a few days to nine months.

  MASTER NOTES--Master notes are demand notes that permit 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 (a) fluctuate based upon changes in
specified interest rates, (b) be reset periodically according to a prescribed
formula or (c) 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 on relatively short notice. 

  REPURCHASE AGREEMENTS--A repurchase agreement is an instrument under which
the Portfolio acquires ownership of a debt security and the seller agrees, at
the time of the sale, to repurchase the obligation at a mutually agreed-upon
time and price, thereby determining the yield during the Portfolio's holding
period. Repurchase transactions are limited to a term not to exceed 365 days.
The Portfolio may enter into repurchase agreements only with institutions
believed by the 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 securities eligible under Rule 2a-7 of
the 1940 Act. For additional information on the use of repurchase agreements,
see the Statement of Additional Information. 
 
  BORROWING MONEY/REVERSE REPURCHASE AGREEMENTS--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 to
facilitate the orderly sale of portfolio securities to accommodate abnormally
heavy redemption requests should they occur. Reverse repurchase transactions
are limited to a term not to exceed 92 days. The Portfolio will use reverse
repurchase agreements when the interest income to be earned from the securities
that would otherwise have to be liquidated to meet redemption requests is
greater than the interest expense of the reverse repurchase transaction. The
Portfolio may enter into reverse repurchase agreements in amounts not exceeding
10% of the value of its total assets. 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 under the 1940
Act.
 
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;
 
                                       8
<PAGE>
  
    2) purchase securities of any one issuer (other than obligations of the
  U.S. Government, its agencies or instrumentalities) if, immediately after
  such purchase, more than 5% of the value of the Portfolio's total assets
  would be invested in such issuer, except as permitted by Rule 2a-7 under the
  1940 Act, as amended from time to time, and except that the Portfolio may
  purchase securities of other investment companies to the extent permitted by
  applicable law or exemptive order; or 
 
    3) borrow money or issue senior securities except (a) for temporary or
  emergency purposes (e.g., in order to facilitate the orderly sale of
  portfolio securities or to accommodate abnormally heavy redemption
  requests), the Portfolio may borrow money from banks or obtain funds by
  entering into reverse repurchase agreements, and (b) to the extent that
  entering into commitments to purchase securities in accordance with the
  Portfolio's investment program may be considered the issuance of senior
  securities. The Portfolio will not purchase portfolio securities while
  borrowings in an amount in excess of 5% of its total assets are outstanding.
 
  The Portfolio's investment objective and the three investment restrictions
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.

  In addition to the restrictions described herein, the Portfolio must also
comply with the requirements of Rule 2a-7 under the 1940 Act, which govern the
operations of money market funds, and which may be more restrictive than the
policies described herein. A description of further investment restrictions
applicable to the Portfolio is contained in the Statement of Additional
Information. 
 
                               PURCHASE OF SHARES

  Shares of the Class are sold on a continuing basis at their net asset value
next determined after an order has been received by the Portfolio. As discussed
below, the Fund reserves the right to reject any purchase order. 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 Transfer
Agent prior to 4:00 p.m. Eastern Time on a business day of the Portfolio.
Purchase orders received after such time will be processed at the next day's
net asset value. Following the initial investment, subsequent purchases of
shares of the Class may also be made via AIM LINK--Registered Trademark--
Remote, a personal computer application software product. Shares of the Class
will earn the dividend declared on the effective date of purchase. 

  A "business day of the Portfolio" is any day on which both the Federal
Reserve Bank of New York and The Bank of New York, the Fund's custodian bank,
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. Further,
the Portfolio reserves the right to change the time for which purchase orders
for shares of the Private Investment Class must be submitted to and received by
the Transfer Agent for execution on the same day on any day when the U.S.
primary broker-dealer community is closed for business or trading is restricted
due to national holidays. 

  Subject to the conditions stated above and the Portfolio's right to reject
any purchase order, orders will be accepted (a) when payment for shares of the
Class purchased is received by The Bank of New York, the Fund's custodian bank,
in the form described below and notice of such order is provided to the
Transfer Agent or (b) at the time the order is placed, if the Portfolio is
assured of payment. 
 
  Payment for shares of the Portfolio purchased must be in the form of federal
funds or other funds immediately available to the Portfolio. Federal Reserve
wires should be sent as early as possible in order to facilitate crediting to
the shareholder's account. Any funds received with respect to an order which is
not accepted by the Portfolio and any funds received for which
 
                                       9
<PAGE>
 
an order has not been received will be returned to the sending institution. An
order to purchase shares of the Class must specify that the "Private Investment
Class of the Liquid Assets Portfolio" is being purchased; otherwise, any funds
received will be returned to the sending institution.

  The minimum initial investment in the Class is $10,000. Institutions may be
requested to maintain separate master accounts in the 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 Class may be
aggregated for the purpose of the minimum investment requirement. No minimum
amount is required for subsequent investments in the Portfolio nor are minimum
balances required. Prior to the initial purchase of shares of the Class, an
Account Application must be completed and sent to the Transfer Agent at P.O.
Box 4333, Houston, Texas 77210-4333. Account Applications may be obtained from
the Transfer Agent. Any changes made to the information provided in the Account
Application must be made in writing or by completing a new form and providing
it to the Transfer Agent. 

  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.
 
                              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--Registered Trademark-- Remote. Normally, the Fund intends
to maintain the net asset value per share of the Portfolio at $1.00 per share.
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 shareholder's Account
Application, but may be remitted by check upon request by a shareholder. If a
redemption request is received by the Transfer Agent prior to 4:00 p.m. Eastern
Time on a business day of the Portfolio, the redemption will be effected at the
net asset value next determined on such day and the shares of the Portfolio to
be redeemed will not receive the dividend declared on the effective date of the
redemption. If a redemption request is received by the Transfer Agent after
4:00 p.m. Eastern Time or on other than a business day of the Portfolio, the
redemption will be effected at the net asset value of the Portfolio determined
as of 4:00 p.m. Eastern Time on the next business day of the Portfolio, and the
proceeds of such redemption will normally be wired on the effective day of the
redemption. The Portfolio reserves the right to change the time for which
redemption requests must be submitted to and received by the Transfer Agent for
execution on the same day on any day when the U.S. primary broker-dealer
community is closed for business or trading is restricted due to national
holidays.
 
  A shareholder may change the bank account designated to receive redemption
proceeds by written notice to the Portfolio. 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 or the
Transfer Agent.

  Shareholders may request a redemption by telephone. Neither the Transfer
Agent nor FMC will be liable for any loss, expense or cost arising out of any
telephone redemption request effected in accordance with the authorization set
forth in the account application if they reasonably believe such request to be
genuine, but may in certain cases be liable for losses due to unauthorized or
fraudulent transactions if they do not follow reasonable procedures for
verification of telephone transactions. 
 
                                       10
<PAGE>
 
Such reasonable procedures for verification of telephone transactions may
include recordings of telephone transactions (maintained for six months), and
mailings of confirmations promptly after the transaction.

  Payment for shares of the Class redeemed by mail and payment for telephone
redemptions in amounts under $1,000 may be made by check mailed within seven
days after receipt of the redemption request in proper form. The Portfolio 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 Portfolio 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 immediately after 4:00 p.m. Eastern Time on
the day of declaration. Net income for dividend purposes is determined daily as
of 4:00 p.m. Eastern Time. The dividend accrued and paid for 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, such as custodian fees,
directors' fees, accounting and legal expenses, based upon the Class' pro rata
share of the net assets of the Portfolio, less (c) expenses directly
attributable to the Class, such as distribution expenses, if any, and transfer
agency fees. Although realized gains and losses on the assets of the Portfolio
are reflected in the net asset value of the Portfolio, they are not expected to
be of an amount which would affect the Portfolio's net asset value of $1.00 per
share for purposes of purchases and redemptions. See "Net Asset Value."
Distributions from net realized short-term gains may be declared and paid
yearly or more frequently. See "Taxes." The Portfolio does not expect to
realize any long-term capital gains or losses.

  All dividends declared during a month will normally be paid by wire transfer.
Payment will normally be made on the first business day of the following month.
A shareholder may elect to have all dividends automatically reinvested in
additional full and fractional shares of the Portfolio at the net asset value
of such shares as of 4:00 p.m. Eastern Time on the last business day of the
month. Such election, or any revocation thereof, must be made in writing by the
shareholder to the Transfer Agent at 11 Greenway Plaza, Suite 100, Houston,
Texas 77046-1173 and will become effective with dividends paid after its
receipt by the Transfer Agent. If a shareholder redeems all the shares in its
account at any time during the month, all dividends declared through the date
of redemption are paid to the shareholder along with the proceeds of the
redemption. 
 
  The Portfolio uses its best efforts to maintain the 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.
 
                                       11
<PAGE>
 
 
                                     TAXES
 
  The Portfolio's policy 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 Portfolio. 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 before February 1 of the next
year, a shareholder will be treated for tax purposes as having received the
dividend in 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.
 
  For purposes of determining taxable income, distribution requirements and
other requirements of Subchapter M, the Portfolio will be treated as a separate
corporation. Therefore, one portfolio of the Fund may not offset its gains
against the other portfolio's losses and each portfolio must specifically
comply with all the provisions of the Code.
 
  Distributions and transactions referred to in the preceding paragraphs may be
subject to state, local or foreign taxes, and the treatment thereof may differ
from the federal income tax consequences discussed herein. Shareholders are
advised to consult with their own tax advisors concerning the application of
state, local or foreign taxes.

  Foreign persons who file a United States tax return after December 31, 1996
for a U.S. tax refund and who are not eligible to obtain a social security
number must apply to the Internal Revenue Service ("IRS") for an individual
taxpayer identification number, using IRS Form W-7. For a copy of the IRS Form
W-7 and accompanying instructions, please contact your tax advisor or the
Transfer Agent.
 
 
                                NET ASSET VALUE
 
  The net asset value per share of the Portfolio is determined daily as of 4:00
p.m. Eastern Time on each business day of the Portfolio. Net asset value per
share is determined by dividing the value of the Portfolio's securities, cash
and other assets (including interest accrued but not collected), less all 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.
This method values a security at its cost on the date of purchase and
thereafter assumes a constant amortization to maturity of any discount or
premium, regardless of the impact of fluctuating interest rates on the market
value of the security. While this method provides certainty in valuation, it
may result in periods during which value, as determined by amortized cost, is
higher or lower than the price the Portfolio would receive if the security were
sold. During such periods, the daily yield on shares of the Portfolio, computed
as described in "Purchases and Redemptions--Performance Information" in the
Statement of Additional Information, may differ somewhat from an identical
computation made by an investment company with identical investments utilizing
available indications as to market value to value its portfolio securities.
 
                               YIELD INFORMATION
 
  Yield information for the Class can be obtained by calling FMC at (800) 877-
7748. 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
 
                                       12
<PAGE>
 
Portfolio's investments, the Portfolio's maturity and the operating expense
ratio of the Class. A SHAREHOLDER'S INVESTMENT IN THE PORTFOLIO IS NOT INSURED
OR GUARANTEED BY THE U.S. GOVERNMENT OR BY ANY INSTITUTION. These factors
should be carefully considered by the investor before making an investment in
the Portfolio.

  For the seven-day period ended August 31, 1997, the current yield and the
effective yield of the Class (which assumes the reinvestment of dividends for a
365-day year and a return for the entire year equal to the annualized current
yield for the period) were 5.37% and 5.51%, 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 Class to eight
decimal places and current yield normally will be available by 5:00 p.m.
Eastern Time.
 
  From time to time and in its discretion, AIM or its affiliates may waive all
or a portion of its advisory fees and/or assume certain expenses of the
Portfolio. Such a practice will have the effect of increasing the Portfolio's
yield and total return.
 
                            REPORTS TO SHAREHOLDERS
 
  The Fund furnishes shareholders with semi-annual reports containing
information about the Portfolio and its operations, including a list of the
investments held in the Portfolio and financial statements. The annual
financial statements are audited by the Fund's independent auditors. A copy of
a current list of the investments held in the Portfolio will be sent to
shareholders upon request.
 
  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
the 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 Portfolio'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 Portfolio and to the general supervision of the
Fund's Board of Directors. Information concerning the Board of Directors may be
found in the Statement of Additional Information. Certain directors and
officers of the Fund are affiliated with AIM and A I M Management Group Inc.
("AIM Management"), the parent corporation of AIM. 
 
INVESTMENT ADVISOR

  A I M Advisors, Inc., 11 Greenway Plaza, Suite 100, Houston, Texas 77046-
1173, acts as the Portfolio's investment advisor pursuant to a Master
Investment Advisory Agreement dated as of February 28, 1997 (the "Advisory
Agreement"). AIM was organized in 1976 and, together with its subsidiaries,
manages, advises or administers 55 investment company portfolios. AIM is a
wholly owned subsidiary of AIM Management, a holding company engaged in the
financial services business. AIM Management is an indirect wholly owned
subsidiary of AMVESCAP PLC, a publicly-traded holding company that, through its
subsidiaries, engages in the business of investment management on an
international basis. 
 
  Pursuant to the terms of the Advisory Agreement, AIM manages the investment
of the Portfolio's assets and obtains and evaluates economic, statistical and
financial information to formulate and implement investment policies for the
Portfolio. The Advisory Agreement 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
 
                                       13
<PAGE>
 
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, 1997, AIM received fees with respect to
the Portfolio which represented 0.04% of the Portfolio's average daily net
assets. During such fiscal year, the expenses of the Class, including AIM's
fees, amounted to 0.36% of the Class' average daily net assets. 
 
ADMINISTRATOR

  The Fund has entered into a Master Administrative Services Agreement dated as
of February 28, 1997 with AIM, pursuant to which AIM is entitled to receive
from the Fund reimbursement of its costs or such reasonable compensation as may
be approved by the Fund's Board of Directors for providing specified
administrative services. Currently, AIM is reimbursed for the services of the
Fund's principal financial officer and his staff, and any expenses related to
such services, as well as the services of staff responding to various
shareholder inquiries. 
 
 
FEE WAIVERS
 
  AIM or its affiliates may in its discretion from time to time agree to waive
voluntarily all or any portion of its advisory fee and/or assume certain
expenses of the Portfolio but will retain its ability to be reimbursed for such
fee or expenses prior to the end of each fiscal year. FMC may in its discretion
from time to time agree to waive voluntarily its 12b-1 fee but will retain its
ability to be reimbursed prior to the end of the fiscal year.
 
DISTRIBUTOR

  The Fund has entered into a Master Distribution Agreement dated as of
February 28, 1997 (the "Distribution Agreement") with FMC, a registered broker-
dealer and is a wholly owned subsidiary of AIM, to act as the exclusive
distributor of the shares of the Class. The address of FMC is 11 Greenway
Plaza, Suite 100, Houston, Texas 77046-1173. Certain directors and officers of
the Fund are affiliated with FMC and AIM Management. The Distribution Agreement
provides that FMC has the exclusive right to distribute shares of the Portfolio
either directly or through other broker-dealers, and receives no fees for its
services with respect to the Portfolio pursuant to the Distribution Agreement.
FMC is the distributor of several other mutual funds managed or advised by AIM.

  FMC may, from time to time, at its expense, pay a bonus or other
consideration or incentive to dealers or banks who sell a minimum dollar amount
of shares of the Class during a specific period of time. In some instances,
these incentives may be offered only to certain dealers or Institutions who
have sold or may sell significant amounts of shares. The total amount of such
additional bonus payments or other consideration shall not exceed .05% of the
net asset value of the shares of the Class sold. Any such bonus or incentive
programs will not change the price paid by investors for the purchase of shares
of the Class or the amount received as proceeds from such sales. Sales of
shares of the Class may not be used to qualify for any incentives to the extent
that such incentives may be prohibited by the laws of any jurisdiction.
 
DISTRIBUTION PLAN
 
  The Fund has adopted a Master Distribution Plan (the "Plan") pursuant to Rule
12b-1 under the 1940 Act. The Plan provides that the Fund may compensate FMC in
connection with the distribution of the shares of the Class in an amount equal
to 0.50% on an annualized basis of the average daily net assets of the
Portfolio attributable to the Class. Such amounts may be expended when and if
authorized by the Board of Directors of the Fund and may be used to finance
such distribution-related services as expenses of organizing and conducting
sales seminars, printing of prospectuses and statements of additional
information (and supplements thereto) and reports for other than existing
shareholders, preparation and distribution of advertising material and sales
literature and costs of administering the Plan.
 
                                       14
<PAGE>
 
  Of the compensation paid to FMC under the Plan, a service fee may be paid to
dealers and other financial institutions that provide continuing personal
shareholder services to their customers who purchase and own shares of the
Class. Payments to dealers and other financial institutions in excess of 0.25%
of the average daily net assets of the Portfolio attributable to the Class
which are attributable to the customers of such dealers or financial
institutions and payments retained by FMC would be characterized as an asset-
based sales charge pursuant to the Plan. The Plan also imposes a cap on the
total amount of sales charges, including asset-based sales charges, that may be
paid by the Portfolio with respect to the Class. The Plan does not obligate the
Fund to reimburse FMC for the actual expenses FMC may incur in fulfilling its
obligations under the Plan on behalf of the Class. Thus, under the Plan, even
if FMC's actual expenses exceed the fee payable to FMC thereunder at any given
time, the Fund will not be obligated to pay more than that fee. If FMC's
expenses are less than the fee it receives, FMC will retain the full amount of
the fee.
 
  As required by Rule 12b-1 under the 1940 Act, the Plan was initially approved
by the Board of Directors, including a majority of the directors who are not
"interested persons" (as defined in the 1940 Act) of the Fund and who have no
direct or indirect financial interest in the operation of the Plan or in any
agreements related to the Plan ("Qualified Directors") on July 19, 1993. In
approving the Plan, the directors considered various factors and determined
that there is a reasonable likelihood that the Plan will benefit the Fund and
the shareholders of the Class.
 
  The Plan requires the officers of the Fund to provide the Board of Directors
at least quarterly with a written report of the amounts expended pursuant to
the Plan and the purposes for which such expenditures were made. The Board of
Directors shall review these reports in connection with their decisions with
respect to the Plan.
 
  The Plan may be terminated by a vote of a majority of the Qualified
Directors, or by a vote of a majority of the holders of the outstanding voting
securities of the Class. Any change in the Plan that would increase materially
the distribution expenses paid by the Class requires shareholder approval;
otherwise the Plan may be amended by the Board of Directors, including a
majority of the Qualified Directors, by votes cast in person at a meeting
called for the purpose of voting upon such amendment. As long as the Plan is in
effect, the selection or nomination of the Qualified Directors is committed to
the discretion of the Qualified Directors.

PORTFOLIO TRANSACTIONS AND BROKERAGE
 
  AIM is responsible for decisions to buy and sell securities for the
Portfolio, broker-dealer selection and negotiation of commission rates. Since
purchases and sales of portfolio securities by the Portfolio are usually
principal transactions, the Portfolio incurs little or no brokerage
commissions. Portfolio securities are normally purchased directly from the
issuer or from a market maker for the securities. The purchase price paid to
dealers serving as market makers may include a spread between the bid and asked
prices. The Portfolio may also purchase securities from underwriters at prices
which include a concession paid by the issuer to the underwriter.
 
  AIM's primary consideration in effecting a security transaction is to obtain
the best net price and the most favorable execution of the order. To the extent
that the executions and prices offered by more than one dealer are comparable,
AIM may, in its discretion, effect transactions with dealers that furnish
statistical, research or other information or services which are deemed by AIM
to be beneficial to the Portfolio's investment 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.
 
                                       15
<PAGE>
 
                              GENERAL INFORMATION
 
ORGANIZATION AND DESCRIPTION OF SHARES
 
  The Fund was incorporated in Maryland on May 3, 1993. Shares of common stock
of the Fund are divided into nine classes, of which four represent interests in
the Portfolio and the remaining five represent interests in the Prime
Portfolio. Each class of shares has a par value of $.001 per share. The other
classes of the Fund may have different sales charges and other expenses which
may affect performance. An investor may obtain information concerning the
Fund's other classes by contacting FMC.
 
  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, 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 to 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.

  The Fund will not normally hold annual shareholders' meetings. As of December
1, 1997, Mellon Bank was the owner of record of 81.93% of the outstanding
shares of the Class. As long as Mellon Bank owns over 25% of such shares, it
may be presumed to be in "control" of the Private Investment Class of the
Liquid Assets Portfolio, as defined in the 1940 Act. 
 
  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 AGENT AND CUSTODIAN

  The Bank of New York, 90 Washington Street, 11th Floor, New York, New York
10286 acts as custodian for the portfolio securities and cash of the Portfolio.
A I M Institutional Fund Services, Inc., 11 Greenway Plaza, Suite 100, Houston,
Texas 77046-1173, acts as transfer agent for shares of the Class. It is
currently anticipated that, effective on or about December 29, 1997, A I M Fund
Services, Inc., a wholly owned subsidiary of AIM and a registered transfer
agent, will become the transfer agent to the Fund. 
 
LEGAL COUNSEL

  The law firm of Ballard Spahr Andrews & Ingersoll, Philadelphia,
Pennsylvania, serves as counsel to the Fund and passes upon legal matters. 
 
SHAREHOLDER INQUIRIES

  Shareholder inquiries concerning the status of an account should be directed
to the Fund at 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173, or may
be made by calling (800) 877-7748. 
 
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 SEC. 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 SEC. Copies of the registration
statement, including items omitted herein, may be obtained from the SEC by
paying the charges prescribed under its rules and regulations.
 
                                       16
<PAGE>


- -------------------------------------    ---------------------------------------
- -------------------------------------    ---------------------------------------

SHORT-TERM INVESTMENTS CO.                            
11 Greenway Plaza, Suite 100                            PROSPECTUS         
Houston, Texas 77046-1173                                            
(800) 877-7748                                      December 17, 1997
                                                                     
INVESTMENT ADVISOR                                      SHORT-TERM 
A I M ADVISORS, INC.                                 INVESTMENTS CO.       
11 Greenway Plaza, Suite 100                          
Houston, Texas 77046-1173                             ------------         
(713) 626-1919                                        
                                                 LIQUID ASSETS PORTFOLIO   
DISTRIBUTOR                                           
FUND MANAGEMENT COMPANY                               ------------         
11 Greenway Plaza, Suite 100                          
Houston, Texas 77046-1173                        PRIVATE INVESTMENT CLASS  
(800) 877-7748                                      
                                                    TABLE OF CONTENTS       
AUDITORS                                
KPMG PEAT MARWICK LLP                    <TABLE>  
700 Louisiana                            <CAPTION>
Houston, Texas 77002                                                        PAGE
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CUSTODIAN                                <S>                                <C> 
THE BANK OF NEW YORK                     Summary...........................   2 
90 Washington Street                                                
11th Floor                               Table of Fees and Expenses........   4 
New York, New York 10286                             
                                         Financial Highlights..............   5 
TRANSFER AGENT                                                  
A I M INSTITUTIONAL FUND SERVICES, INC.  Suitability For Investors.........   5 
11 Greenway Plaza, Suite 100                                      
Houston, Texas 77046-1173                Investment Program................   5 
                                                                  
                                         Purchase of Shares................   9 
                                                                      
                                         Redemption of Shares..............  10 
                                                                      
  NO PERSON HAS BEEN AUTHORIZED TO GIVE  Dividends.........................  11 
ANY INFORMATION OR TO MAKE ANY                          
REPRESENTATIONS NOT CONTAINED IN THIS    Taxes.............................  12 
PROSPECTUS IN CONNECTION WITH THE                   
OFFERING MADE BY THIS PROSPECTUS, AND    Net Asset Value...................  12 
IF GIVEN OR MADE, SUCH INFORMATION OR                     
REPRESENTATIONS MUST NOT BE RELIED       Yield Information.................  12 
UPON AS HAVING BEEN AUTHORIZED BY THE                                
FUND OR THE DISTRIBUTOR. THIS            Reports to Shareholders...........  13 
PROSPECTUS DOES NOT CONSTITUTE AN                                 
OFFER IN ANY JURISDICTION TO ANY         Management of the Fund............  13 
PERSON TO WHOM SUCH OFFERING MAY NOT                               
LAWFULLY BE MADE.                        General Information...............  16 
                                         </TABLE>
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