SHORT TERM INVESTMENTS TRUST
N-30B-2, 1995-04-26
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<PAGE>   1
[AIM LOGO]

LETTER
TO OUR
SHAREHOLDERS





March 6, 1995

Dear Shareholder:

              Volatility persisted in short-term fixed-income securities
              markets over the six months ended February 28, 1995, as interest
 [PHOTO       rates continued to climb. The Federal Reserve Board maintained
Charles T.    its restrictive monetary policy by raising short-term interest
  Bauer,      rates in November and again in February, which positioned the
Chairman of   federal funds rate at approximately 6 percent and the discount
the Board of  rate at 5.25 percent. 
 the Fund]        Financial markets strengthened as economic indicators,
              though mixed,  suggested a slower rate of growth in the economy. 
              Federal Reserve Chairman Alan Greenspan provided encouraging
              testimony before Congress in late February that the current
              condition of the economy--moderate growth, low unemployment, and
              low inflation--was healthier than it had been in years. In
              addition, the Chairman said the central bank would be ready to
              loosen credit at the first sign of recession. Greenspan's remarks
              triggered a rally in both stock and bond markets, but  the dollar
              fell. The dollar's persistent weakness led some analysts to
              speculate that inflation remains a near-term possibility,
              prompting renewed concerns that interest rates would have to rise
              again in coming months.

YOUR INVESTMENT PORTFOLIO

The Short-Term Investments Trust (STIT) Treasury TaxAdvantage Portfolio
managers consistently pursued the Portfolio's objective of maximizing current
income consistent with the preservation of capital and maintenance of liquidity
by investing in direct obligations of the U.S. Treasury. The Portfolio's
weighted average maturity for February was 35 days. A complete listing of
Treasury TaxAdvantage Portfolio's holdings begins on page 3.
    Treasury TaxAdvantage Portfolio managers took advantage of rising interest
rates to capture attractive yields competitive with the yields of similar funds
tracked by the IBC/Donoghue's Money Fund Averages(TM). As of February 28, 1995,
the 30-day average yield of the Institutional Class of Treasury TaxAdvantage
Portfolio was 5.43 percent compared to 5.56 percent for IBC/Donoghue's Money
Fund Averages--Government Only/Institutional Only. Net assets of the
Institutional Class of Treasury TaxAdvantage Portfolio were $417.16 million.
    The Portfolio maintained its superior credit quality rating of AAAm-G, the
highest given by Standard & Poor's Corporation, a widely known credit rating
agency. The AAAm-G rating is historical and is based on an annual analysis of
the Portfolio's credit quality and composition, management, and weekly
portfolio review.

OUTLOOK FOR THE FUTURE

Leading economic indicators continue to suggest healthy economic conditions and
low inflation, and the economy is widely expected to slow in the second half of
1995. As a result, fixed-income securities have begun to exhibit more stability
across most maturity levels. The direction of the dollar remains a significant
uncertainty that could precipitate renewed inflation concerns and higher
short-term interest rates.
    AIM remains committed to the primary objectives of safety, liquidity, and 
yield in institutional money fund management.  As always, we are ready to
respond to your comments about this report and any questions you may have about
your Fund. Please call us at (800) 659-1005.

Respectfully submitted,

/s/  CHARLES T. BAUER

Charles T. Bauer
Chairman
<PAGE>   2

AVERAGE
MONTHLY YIELD
COMPARISON
(6 months ended
2/28/95)

STIT Treasury TaxAdvantage Portfolio Institutional Class vs.
IBC/Donoghue's Money Fund Averages(TM)--Government Only/Institutional Only

                             [GRAPH APPEARS HERE]
<TABLE>
<CAPTION>
                                   STIT                IBC/DONOGHUE'S
                                 TREASURY                MONEY FUND
                               TAXADVANTAGE             AVERAGES --
                                PORTFOLIO             GOVERNMENT ONLY/
Measurement Period          INSTITUTIONAL CLASS      INSTITUTIONAL ONLY
(6 months ended 2/28/95)         (YIELD)                  (YIELD)
- - -----------------------     -------------------      ------------------
<S>                              <C>                      <C>
9/94                             4.25%                    4.34%
10/94                            4.48                     4.47
11/94                            4.72                     4.78
12/94                            5.01                     5.15
1/95                             5.21                     5.27
2/95                             5.43                     5.56
</TABLE>

Yields are 30-day average yields for the month-ends shown.

WEIGHTED
AVERAGE MATURITY
COMPARISON
(6 months ended
2/28/95)

STIT Treasury TaxAdvantage Portfolio Institutional Class vs.
IBC/Donoghue's Money Fund Averages(TM)--Government Only/Institutional Only

                            [GRAPH APPEARS HERE]
<TABLE>
<CAPTION>
                                   STIT                IBC/DONOGHUE'S
                                 TREASURY                MONEY FUND
                               TAXADVANTAGE             AVERAGES --
                                PORTFOLIO             GOVERNMENT ONLY/
Measurement Period          INSTITUTIONAL CLASS      INSTITUTIONAL ONLY
(6 months ended 2/28/95)         (DAYS)                  (DAYS)
- - -----------------------     -------------------      ------------------
<S>                               <C>                     <C> 
9/94                              33                      37
10/94                             39                      38
11/94                             35                      35
12/94                             34                      33
1/95                              32                      34
2/95                              35                      37
</TABLE>

Source: IBC's Money Market Insight(R) of Holliston, MA 01746
<PAGE>   3
 
                    SCHEDULE OF INVESTMENTS
 
                    February 28, 1995
                    (Unaudited)
 
<TABLE>
<CAPTION>
                                                                            MATURITY           PAR              VALUE
                              <S>                                           <C>            <C>               <C>
                              U.S. TREASURY SECURITIES

                              U.S. TREASURY BILLS(a)
                              5.26%                                         03/02/95       $ 6,520,000       $  6,519,047
                              -------------------------------------------------------------------------------------------
                              5.375%                                        03/02/95           510,000            509,924
                              -------------------------------------------------------------------------------------------
                              5.22%                                         03/09/95        27,900,000         27,867,636
                              -------------------------------------------------------------------------------------------
                              5.31%                                         03/09/95        27,550,000         27,517,491
                              -------------------------------------------------------------------------------------------
                              5.315%                                        03/09/95         2,020,000          2,017,614
                              -------------------------------------------------------------------------------------------
                              5.35%                                         03/09/95         9,000,000          8,989,300
                              -------------------------------------------------------------------------------------------
                              5.20%                                         03/23/95        18,840,000         18,780,131
                              -------------------------------------------------------------------------------------------
                              5.50%                                         04/06/95        20,000,000         19,890,000
                              -------------------------------------------------------------------------------------------
                              5.57%                                         04/06/95        17,480,000         17,382,636
                              -------------------------------------------------------------------------------------------
                              5.58%                                         04/06/95         5,000,000          4,972,100
                              -------------------------------------------------------------------------------------------
                              5.585%                                        04/06/95         6,565,000          6,528,335
                              -------------------------------------------------------------------------------------------
                              5.595%                                        04/06/95         1,900,000          1,889,369
                              -------------------------------------------------------------------------------------------
                              5.62%                                         04/06/95         1,445,000          1,436,879
                              -------------------------------------------------------------------------------------------
                              5.63%                                         04/06/95        25,040,000         24,899,025
                              -------------------------------------------------------------------------------------------
                              5.605%                                        04/13/95        32,630,000         32,411,547
                              -------------------------------------------------------------------------------------------
                              5.69%                                         04/20/95        21,140,000         20,972,935
                              -------------------------------------------------------------------------------------------
                              5.73%                                         04/20/95        25,000,000         24,801,042
                              -------------------------------------------------------------------------------------------
                              5.66%                                         05/04/95         2,605,000          2,578,788
                              -------------------------------------------------------------------------------------------
                              5.71%                                         05/04/95        21,590,000         21,370,838
                              -------------------------------------------------------------------------------------------
                              5.75%                                         05/04/95         3,400,000          3,365,244
                              -------------------------------------------------------------------------------------------
                              5.815%                                        05/04/95        15,000,000         14,844,933
                              -------------------------------------------------------------------------------------------
                              5.83%                                         05/04/95         5,000,000          4,948,178
                              -------------------------------------------------------------------------------------------
                              5.71%                                         05/25/95        30,000,000         29,595,542
                              -------------------------------------------------------------------------------------------
                              5.76%                                         06/01/95        30,000,000         29,558,400
                              -------------------------------------------------------------------------------------------
</TABLE>
 
                                                             3
 
<PAGE>   4
 
                    SCHEDULE OF INVESTMENTS (CONTINUED)
 
                    February 28, 1995
                    (Unaudited)
 
<TABLE>
<CAPTION>
                                                                            MATURITY           PAR              VALUE
                              <S>                                           <C>            <C>               <C>
                              U.S. TREASURY SECURITIES-(continued)

                              U.S. TREASURY NOTES
                              3.875%                                        03/31/95       $15,000,000       $ 14,975,329
                              -------------------------------------------------------------------------------------------
                              3.875%                                        04/30/95        10,310,000         10,274,430
                              -------------------------------------------------------------------------------------------
                              5.875%                                        05/15/95        18,650,000         18,643,746
                              -------------------------------------------------------------------------------------------
                              8.50%                                         05/15/95        21,485,000         21,590,739
                              -------------------------------------------------------------------------------------------
                              4.125%                                        06/30/95         2,390,000          2,375,791
                              -------------------------------------------------------------------------------------------
                                       Total U.S. Treasury Securities                                         421,506,969
                              -------------------------------------------------------------------------------------------
                                       TOTAL INVESTMENTS -- 100.11%(b)                                        421,506,969(c)
                              -------------------------------------------------------------------------------------------
                                       OTHER ASSETS LESS LIABILITIES -- (0.11%)                                  (483,773)
                              -------------------------------------------------------------------------------------------
                                       NET ASSETS -- 100.00%                                                 $421,023,196
                              ===========================================================================================
</TABLE>
 
                    (a) U.S. Treasury bills are traded on a discount
                        basis. In such cases the interest rate shown
                        represents the rate of discount paid or received
                        at the time of purchase by the Portfolio.
                    (b) Percentage of Net Assets.
                    (c) Also represents cost for federal income tax
                        purposes.
 
                    See Notes to Financial Statements
 
                                                             4
 
<PAGE>   5
 
                    STATEMENT OF ASSETS AND LIABILITIES
 
                    February 28, 1995
                    (Unaudited)
 
<TABLE>
                            <S>                                                                  <C>
                            ASSETS:

                            Investments, at value (amortized cost)                               $421,506,969
                            ---------------------------------------------------------------------------------
                            Cash                                                                          110
                            ---------------------------------------------------------------------------------
                            Interest receivable                                                     1,247,958
                            ---------------------------------------------------------------------------------
                            Investment for deferred compensation plan                                   5,212
                            ---------------------------------------------------------------------------------
                            Receivable for reimbursement from advisor                                   9,100
                            ---------------------------------------------------------------------------------
                            Other assets                                                               28,155
                            ---------------------------------------------------------------------------------
                                Total assets                                                      422,797,504
                            ---------------------------------------------------------------------------------
                            LIABILITIES:

                            Dividends payable                                                       1,677,820
                            ---------------------------------------------------------------------------------
                            Deferred compensation payable                                               5,212
                            ---------------------------------------------------------------------------------
                            Accrued advisory fees                                                      45,045
                            ---------------------------------------------------------------------------------
                            Accrued transfer agent fees                                                 7,930
                            ---------------------------------------------------------------------------------
                            Accrued trustees' fees                                                      2,741
                            ---------------------------------------------------------------------------------
                            Accrued administrative service fees                                         6,347
                            ---------------------------------------------------------------------------------
                            Accrued operating expenses                                                 29,213
                            ---------------------------------------------------------------------------------
                                Total liabilities                                                   1,774,308
                            ---------------------------------------------------------------------------------
                            NET ASSETS                                                           $421,023,196
                            =================================================================================
                            NET ASSETS:
                            Institutional Class                                                  $417,159,255
                            =================================================================================
                            Private Investment Class                                             $  3,863,941
                            =================================================================================
                            NET ASSET VALUE PER SHARE:
                            Shares outstanding, $.01 par value per share:
                            Institutional Class                                                   417,079,252
                            =================================================================================
                            Private Investment Class                                                3,863,200
                            =================================================================================
                            Net asset value, offering and redemption price per share             $       1.00
                            =================================================================================
</TABLE>
 
                    See Notes to Financial Statements.
 
                                                             5
 
<PAGE>   6
 
                    STATEMENT OF OPERATIONS
 
                    For the six months ended February 28, 1995
                    (Unaudited)
 
<TABLE>
                            <S>                                                                    <C>
                            INVESTMENT INCOME:

                            Interest income                                                        $9,973,205
                            ---------------------------------------------------------------------------------
                            EXPENSES:
                            Advisory fees                                                             293,710
                            ---------------------------------------------------------------------------------
                            Custodian fees                                                             22,376
                            ---------------------------------------------------------------------------------
                            Administrative service fees                                                21,642
                            ---------------------------------------------------------------------------------
                            Trustees' fees and expenses                                                 4,042
                            ---------------------------------------------------------------------------------
                            Transfer agent fees                                                        12,747
                            ---------------------------------------------------------------------------------
                            Printing expenses                                                          22,565
                            ---------------------------------------------------------------------------------
                            Distribution fees                                                           2,438
                            ---------------------------------------------------------------------------------
                            Other                                                                      28,262
                            ---------------------------------------------------------------------------------
                                     Total expenses                                                   407,782
                            ---------------------------------------------------------------------------------
                            Less expenses assumed by advisor                                           (9,100)
                            =================================================================================              
                                     Net expenses                                                     398,682
                            =================================================================================
                            Net investment income                                                   9,574,523
                            ---------------------------------------------------------------------------------
                            Net realized gain on sales of investments                                  25,275
                            ---------------------------------------------------------------------------------
                            Net increase in net assets resulting from operations                   $9,599,798
                            =================================================================================
</TABLE>
 
                    See Notes to Financial Statements.
 
                                                             6
 
<PAGE>   7
 
                    STATEMENT OF CHANGES IN NET ASSETS
 
                    For the six months ended February 28, 1995 and 
                    the year ended August 31, 1994
                    (Unaudited)
 
<TABLE>
<CAPTION>
                                                                                     February 28,     August 31,
                                                                                         1995            1994
                            -------------------------------------------------------------------------------------
                            <S>                                                      <C>             <C>
                            OPERATIONS:
                              Net investment income                                  $  9,574,523    $ 13,926,577
                            -------------------------------------------------------------------------------------
                              Net realized gain on sales of investments                    25,275          12,246
                            -------------------------------------------------------------------------------------
                                Net increase in net assets resulting from
                                   operations                                           9,599,798      13,938,823
                            -------------------------------------------------------------------------------------
                            Distributions to shareholders from net investment
                              income                                                   (9,574,523)    (13,926,577)
                            -------------------------------------------------------------------------------------
                            Share transactions-net                                     17,116,216     (30,823,909)
                            -------------------------------------------------------------------------------------
                                Net increase (decrease) in net assets                  17,141,491     (30,811,663)
                            -------------------------------------------------------------------------------------
                            NET ASSETS:
                              Beginning of period                                     403,881,705     434,693,368
                            -------------------------------------------------------------------------------------
                              End of period                                          $421,023,196    $403,881,705
                            =====================================================================================
                            NET ASSETS CONSIST OF:
                              Shares of beneficial interest                          $420,942,452    $403,826,236
                            -------------------------------------------------------------------------------------
                              Undistributed net realized gain on sales of
                                investments                                                80,744          55,469
                            -------------------------------------------------------------------------------------
                                                                                     $421,023,196    $403,881,705
                            =====================================================================================
</TABLE>
 
                    See Notes to Financial Statements.
 
                                                             7
 
<PAGE>   8
 
                    NOTES TO FINANCIAL STATEMENTS
 
                    February 28, 1995
                    (Unaudited)

                    NOTE 1-SIGNIFICANT ACCOUNTING POLICIES

                    Short-Term Investments Trust (the "Fund") is
                    registered under the Investment Company Act of 1940,
                    as amended, as an open-end series, diversified
                    management investment company. The Fund is organized
                    as a Delaware business trust consisting of two
                    different portfolios, each of which offers separate
                    series of shares: the Treasury Portfolio and the
                    Treasury TaxAdvantage Portfolio, with the assets,
                    liabilities and operations of each portfolio
                    accounted for separately. Information presented in
                    these financial statements pertains only to the
                    Treasury TaxAdvantage Portfolio (the "Portfolio").
                    The Portfolio consists of two different classes of
                    shares: the Institutional Class and the Private
                    Investment 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 397 days
                       or less. The securities are valued on the basis
                       of amortized cost which approximates market
                       value. This method values a security at its cost
                       on the date of purchase and thereafter assumes a
                       constant amortization to maturity of any discount
                       or premium.
 
                    B. Securities Transactions, Investment Income and
                       Distributions - Securities transactions are
                       accounted for on a trade date basis. Realized
                       gains or losses are computed on the basis of
                       specific identification of the securities sold.
                       Interest income, adjusted for amortization of
                       premiums and discounts on investments, is accrued
                       daily. Dividends to shareholders are declared
                       daily and are paid on the first business day of
                       the following month.
 
                    C. Federal Income Taxes - The Portfolio intends to
                       comply with the requirements of the Internal
                       Revenue Code necessary to qualify as a regulated
                       investment company and, as such, will not be
                       subject to federal income taxes on otherwise
                       taxable income (including net realized capital
                       gains) which is distributed to shareholders.
                       Therefore, no provision for federal income taxes
                       is recorded in the financial statements.
 
                    D. Expenses - Operating expenses directly
                       attributable to a class of shares are charged to
                       that class' operations. Expenses which are
                       applicable to more than one class, e.g., advisory
                       fees, are allocated among them.
 
                                                             8
 
<PAGE>   9
 
                    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 $250 million                                                      0.20%
                           ----------------------------------------------------------------------------
                           Over $250 million to $500 million                                       0.15
                           ----------------------------------------------------------------------------
                           Over $500 million                                                       0.10
                           ----------------------------------------------------------------------------
</TABLE>
 
                    During the six months ended February 28, 1995, AIM
                    voluntarily waived advisory fees of $64,500 and
                    assumed expenses of $9,100.
 
                      The Fund has entered into a master distribution
                    agreement with Fund Management Company ("FMC") for
                    the distribution of shares of the Institutional
                    Class and the Private Investment Class. The Company
                    has also adopted a distribution plan (the "Plan")
                    pursuant to Rule 12b-1 under the 1940 Act with
                    respect to the Private Investment Class. The Plan
                    provides that the Private Investment Class may pay
                    up to a 0.50% maximum annual rate of the Private
                    Investment Class' average daily net assets. Of this
                    amount, the Fund may pay an asset-based sales charge
                    to FMC and the Portfolio may pay a service fee of
                    0.25% of the average daily net assets of the Private
                    Investment Class to selected 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. Any amounts not paid as a service fee under
                    such Plan would constitute an asset-based sales
                    charge. The Plan also imposes a cap on the total
                    amount of sales charges, including asset-based sales
                    charges, that may be paid by the Portfolio with
                    respect to the Private Investment Class. During the
                    six months ended February 28, 1995, the Private
                    Investment Class paid $2,438 as compensation under
                    the Plan.
                      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.
                      The Portfolio, pursuant to its administrative
                    services agreement with AIM, has agreed to reimburse
                    AIM for certain costs incurred in providing
                    administrative services to the Portfolio. During the
                    six months ended February 28, 1995 the Portfolio
                    reimbursed AIM $21,642 for such services. Effective
                    September 16, 1994, A I M Institutional Fund
                    Services, Inc. ("AIFS") became a transfer agent to
                    the Fund.
                      Certain officers and trustees of the Fund are
                    officers and directors of AIM, FMC, and AIFS.
                      The Portfolio paid legal fees of $700 for services
                    rendered by Reid & Priest as counsel to the Board of
                    Trustees. In September 1994, Kramer, Levin,
                    Naftalis, Kamin & Frankel was appointed as counsel
                    to the Board of Trustees and the Portfolio paid
                    legal fees of $630 for services rendered by that
                    firm as counsel to the Board of Trustees. A trustee
                    of the Trust was a member of the firm of Reid &
                    Priest until September 1994, when be became a member
                    of Kramer, Levin, Naftalis, Kamin & Frankel.
 
                                                             9
 
<PAGE>   10
 
                    NOTE 3-TRUSTEES' FEES
 
                    Trustees' fees represent remuneration paid or
                    accrued to each trustee who is not an "interested
                    person" of the Fund. The Fund may invest trustees'
                    fees, if so elected by a trustee, in mutual fund
                    shares in accordance with a deferred compensation
                    plan.
 
                    NOTE 4-SHARE INFORMATION
 
                    Changes in shares outstanding for the six months
                    ended February 28, 1995 and the year ended August
                    31, 1994 were as follows:
 
<TABLE>
<CAPTION>
                                                                  FEBRUARY 28, 1995                    AUGUST 31, 1994
                                                            ------------------------------    ----------------------------------
                                                               SHARES           AMOUNT            SHARES             AMOUNT
                              <S>                           <C>              <C>              <C>                <C>
                              --------------------------------------------------------------------------------------------------
                              TaxAdvantage Portfolio:
                              Sold:
                                Institutional Class           824,235,524    $ 824,235,524      1,529,572,244    $ 1,529,572,244
                              --------------------------------------------------------------------------------------------------
                                Private Investment Class       13,381,821       13,381,821                 --                 --
                              --------------------------------------------------------------------------------------------------
                              Issued as reinvestment of
                                dividends:
                              --------------------------------------------------------------------------------------------------
                                Institutional Class               157,060          157,060             72,270             72,270
                              --------------------------------------------------------------------------------------------------
                                Private Investment Class           69,990           69,990                 --                 --
                              --------------------------------------------------------------------------------------------------
                              Reacquired:
                                Institutional Class          (811,139,568)    (811,139,568)    (1,560,468,423)    (1,560,468,423)
                              --------------------------------------------------------------------------------------------------
                                Private Investment Class       (9,588,611)      (9,588,611)                --                 --
                              --------------------------------------------------------------------------------------------------
                              Net increase (decrease)          17,116,216    $  17,116,216        (30,823,909)   $   (30,823,909)
                              ==================================================================================================
</TABLE>
 
                    * The Private Investment Class commenced operations
                      on December 21, 1994.
 
                                                             10
 
<PAGE>   11
 
                    NOTE 5-FINANCIAL HIGHLIGHTS
 
                    Shown below are the condensed financial highlights
                    for a share outstanding during the six months ended
                    February 28, 1995, each of the years in the
                    four-year period ended August 31, 1994 and the
                    period August 17, 1990 (date operations commenced)
                    through August 31, 1990.
 
<TABLE>
<CAPTION>
                                                                                            AUGUST 31,
                                                          FEBRUARY 28,   -------------------------------------------------------
                                                              1995        1994        1993        1992        1991        1990
                                 ----------------------      -------     -------     -------     -------     -------     -------
                                 <S>                         <C>         <C>         <C>         <C>         <C>         <C>
                                 Net asset value,
                                   beginning of period       $  1.00     $  1.00     $  1.00     $  1.00     $  1.00     $  1.00
                                 ----------------------      -------     -------     -------     -------     -------     -------
                                 Income from investment
                                   operations:
                                   Net investment
                                     income                     0.02        0.03        0.03        0.04        0.07       0.003
                                 ----------------------      -------     -------     -------     -------     -------     -------
                                 Less distributions:
                                   Dividends from net
                                     investment income         (0.02)      (0.03)      (0.03)      (0.04)      (0.07)     (0.003)
                                 ----------------------      -------     -------     -------     -------     -------     -------
                                 Net asset value, end
                                   of period                 $  1.00     $  1.00     $  1.00     $  1.00     $  1.00     $  1.00
                                 ======================      =======     =======     =======     =======     =======     =======
                                 Total return                   4.86%(a)    3.29%       2.96%       4.32%       6.70%       7.79%(a)
                                 ======================      ========    ========    ========    ========    ========    ========
                                 Ratios/supplemental
                                   data:
                                 Net assets, end of
                                   period (000s
                                   omitted)                  $417,159    $403,882    $434,693    $573,283    $403,846    $16,201
                                 ======================      ========    ========    ========    ========    ========    ========
                                 Ratio of expenses to
                                   average net assets           0.20%(b)    0.20%(c)    0.20%       0.17%(c)    0.14%(c)    0.10%(d)
                                 ======================      ========    ========    ========    ========    ========    ========
                                 Ratio of net
                                   investment income to
                                   average net assets           4.85%(b)    3.23%(c)    2.93%       4.16%(c)    6.16%(e)    7.74%(d)
                                 ======================      ========    ========    ========    ========    ========    ========
</TABLE>
 
                    (a) Annualized.
                    (b) Ratios are annualized and based on average net
                        assets of $395,415,654.                          
                        After waiver of advisory fees. Annualized ratio  
                        of expenses and net investment income to average 
                        net assets prior to waiver of advisory fees were 
                        0.23% and 4.81%, respectively.                   
                    (c) After waiver of advisory fees.
                    (d) Annualized. After waiver of advisory fees and
                        expense reimbursements.
 
                                                             11
 
<PAGE>   12

                                   TRUSTEES

Charles T. Bauer                                                John F. Kroeger
Bruce L. Crockett                                              Lewis F. Pennock
Owen Daly II                                                    Ian W. Robinson
Carl Frischling                                                  Louis S. Sklar
Robert H. Graham
 
                                   OFFICERS

Charles T. Bauer                                                       Chairman
Robert H. Graham                                                      President
John J. Arthur                                   Sr. Vice President & Treasurer
Gary T. Crum                                                 Sr. Vice President
William H. Kleh                                              Sr. Vice President
Carol F. Relihan                                     Vice President & Secretary
Dana R. Sutton                             Vice President & Assistant Treasurer
Polly A. Ahrendts                                                Vice President
Gary V. Beauchamp                                                Vice President
Melville B. Cox                                                  Vice President
Karen Dunn Kelley                                                Vice President
J. Abbott Sprague                                                Vice President
Joseph A. Dichiara                                     Assistant Vice President
Dineen Hughes                                          Assistant Vice President
Nancy L. Martin                                             Assistant Secretary
Kathleen J. Pflueger                                        Assistant Secretary
Samuel D. Sirko                                             Assistant Secretary
Stephen I. Winer                                            Assistant Secretary
Mary J. Benson                                              Assistant Treasurer

                              INVESTMENT ADVISOR
                             A I M Advisors, Inc.
                        11 Greenway Plaza, Suite 1919
                              Houston, TX 77046
                                (800) 347-1919
                                      
                                 DISTRIBUTOR
                           Fund Management Company
                        11 Greenway Plaza, Suite 1919
                              Houston, TX 77046
                                (800) 659-1005
                                      
                                  CUSTODIAN
                             The Bank of New York
                            110 Washington Street
                              New York, NY 10286
                                      
                            LEGAL COUNSEL TO FUND
                      Ballard Spahr Andrews & Ingersoll
                        1735 Market Street, 51st Floor
                         Philadelphia, PA 19103-7599
                                      
                          LEGAL COUNSEL TO TRUSTEES
               Kramer, Levin, Naftalis, Nessen, Kamin & Frankel
                               919 Third Avenue
                              New York, NY 10022

                               TRANSFER AGENTS
                        State Street Bank & Trust Co.
                             225 Franklin Street
                               Boston, MA 02110
                                     and
                   A I M Institutional Fund Services, Inc.
                        11 Greenway Plaza, Suite 1919
                              Houston, TX 77046
                                      
This report may be distributed only to current shareholders or to persons who
have received a current prospectus.  


                                                            Short-Term   
                                                            Investments Trust
                                                            (STIT)      
                                                                       
                                                            Treasury  
                                                            TaxAdvantage
                                                            Portfolio    
                                                                       
                                                            Institutional   
                                                            Class     
                                                         
                                                            Semi-         
                                                            Annual            
                                                            Report
                                                                       
                                                            February 28, 1995 
                                                                       
                                            [LOGO OF FUND MANAGEMENT COMPANY]


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