SHORT TERM INVESTMENTS TRUST
N-30D, 1996-05-01
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<PAGE>
 
[AIM LOGO APPEARS HERE]      Dear Shareholder:

              [PHOTO of      We are pleased to report that during the six months
          Charles T. Bauer,  covered by this report, Short-Term Investments 
           Chairman of the   Trust (STIT) Treasury Portfolio Institutional Class
LETTER    Board of The Fund  continued to capture the attractive yields 
TO OUR      APPEARS HERE]    available through a portfolio of U.S. Treasury 
SHAREHOLDERS                 securities and repurchase agreements secured by 
                             such securities.
                As of February 29, 1996, the close of the reporting period, the
              30-day average yield for the Institutional Class of the Treasury
              Portfolio was 5.23%, compared to 4.95% for IBC/Donoghue's Money
              Fund Averages(TM)--Government Only/Institutions Only and 4.64% for
              IBC/Donoghue's Money Fund Averages(TM)-U.S. Treasury & Repurchase
              Agreements. The Institutional Class's seven-day yield was 5.23%.
              At the close of the reporting period, net assets of the
              Institutional Class of the Portfolio were $2.39 billion.
                STIT Treasury Portfolio maintained its strict investment
              discipline, concentrating investments in U.S. Treasury securities
              and repurchase agreements, with the objective of the maximization
              of current income to the extent consistent with the preservation
              of capital and the maintenance of liquidity.
                We are pleased to note that STIT Treasury Portfolio maintained
              its AAAm credit quality rating, the highest given by Standard &
              Poor's Corporation, a widely known credit rating agency. The AAAm
              rating is historical and is based on annual analysis of the
              Portfolio's credit quality, composition, management, and weekly
              portfolio review.
                Financial markets were favorable during the first half of the
              reporting period. Inflation seemed thoroughly tamed while economic
              growth was a robust 3.6% during the third quarter of 1995.
              However, late in 1995, signs of economic weakness began to emerge,
              including contraction in industrial production and declines in the
              index of leading economic indicators. These were sufficient to
              prompt the Federal Reserve Board to lower short-term interest
              rates twice, first in December 1995 and again at the end of
              January 1996.
                At the close of the reporting period, the near-term prognosis
              was for slow-to-moderate economic growth coupled with low
              inflation. Such conditions could put additional downward pressure
              on interest rates, and many believe further rate cuts may be
              necessary. However, in testimony before Congress late in February,
              Federal Reserve Board Chairman Alan Greenspan described the
              economy as "basically on track for sustained growth," leaving open
              the possibility that rates could remain unchanged. The relatively
              short weighted average maturity of STIT Treasury Portfolio enables
              it to respond quickly to changes in the interest rate environment.
              At the close of the reporting period, the Portfolio's weighted
              average maturity was 39 days.
                AIM remains committed to service and to the primary objectives
              of safety, liquidity, and yield in institutional money fund
              management. We are ready to respond to your comments about this
              report and to any questions you may have. Please contact one of
              our representatives at 800-659-1005.

              Respectfully submitted,

              /s/ CHARLES T. BAUER

              Charles T. Bauer
              Chairman


              Government securities, such as U.S. Treasury bills and bonds,
              offer a high degree of safety and are guaranteed as to timely
              payment of principal and interest. Fund shares are not insured
              and their yield will vary with market conditions. There can be no
              assurance that the Portfolio will be able to maintain a net asset
              value of $1.00 per share.
<PAGE>
 
AVERAGE MONTHLY YIELD COMPARISON
6 months ended 2/29/96 (Yields are 30-day average yields for the month-ends
shown)

<TABLE> 
<CAPTION> 
                         STIT Treasury Portfolio  IBC/Donoghue's Money Fund Averages(TM)-  IBC/Donoghue's Money Fund Averages(TM)-
                           Institutional Class       Government Only/Institutions Only     U.S. Treasury & Repurchase Agreements
<S>                      <C>                         <C>                                    <C> 
9/95                               5.75%                            5.39%                                   5.13%
10/95                              5.70                             5.35                                    5.09
11/95                              5.72                             5.37                                    5.10
12/95                              5.67                             5.32                                    5.05
1/96                               5.49                             5.16                                    4.87
2/96                               5.23                             4.95                                    4.64
</TABLE> 

WEIGHTED AVERAGE MATURITY COMPARISON
6 months ended 2/29/96

<TABLE> 
<CAPTION> 
                         STIT Treasury Portfolio  IBC/Donoghue's Money Fund Averages(TM)-  IBC/Donoghue's Money Fund Averages(TM)-
                           Institutional Class       Government Only/Institutions Only     U.S. Treasury & Repurchase Agreements
<S>                      <C>                         <C>                                    <C> 
9/95                            35 days                           43 days                                60 days 
10/95                           38                                45                                     64       
11/95                           56                                41                                     59     
12/95                           29                                39                                     62      
1/96                            42                                39                                     59       
2/96                            39                                44                                     61           
</TABLE> 
                                        Source: IBC's Money Market Insight(R) of
                                                             Holliston, MA 01746



 
                                       2
<PAGE>
 
SCHEDULE OF INVESTMENTS
February 29, 1996
(Unaudited)
<TABLE>
<CAPTION>
                                            MATURITY PAR (000)     VALUE
<S>                                         <C>      <C>       <C>
U.S. TREASURY SECURITIES - 29.37%

U.S. TREASURY BILLS(a) - 15.41%

5.27%                                       03/14/96 $ 25,000  $  24,952,423
- ----------------------------------------------------------------------------
5.305%                                      03/14/96   25,000     24,952,108
- ----------------------------------------------------------------------------
5.32%                                       03/14/96   50,000     49,903,945
- ----------------------------------------------------------------------------
5.30%                                       03/28/96   50,000     49,801,250
- ----------------------------------------------------------------------------
5.308%                                      03/28/96   25,000     24,900,484
- ----------------------------------------------------------------------------
5.31%                                       04/11/96   50,000     49,697,625
- ----------------------------------------------------------------------------
5.19%                                       05/02/96   50,000     49,553,083
- ----------------------------------------------------------------------------
5.25%                                       05/16/96   50,000     49,445,834
- ----------------------------------------------------------------------------
5.15%                                       06/06/96   50,000     49,306,181
- ----------------------------------------------------------------------------
5.055%                                      06/27/96   25,000     24,585,771
- ----------------------------------------------------------------------------
5.19%                                       06/27/96   25,000     24,574,709
- ----------------------------------------------------------------------------
5.295%                                      06/27/96   25,000     24,566,104
- ----------------------------------------------------------------------------
5.40%                                       06/27/96   25,000     24,557,500
- ----------------------------------------------------------------------------
4.735%                                      08/22/96   50,000     48,855,708
- ----------------------------------------------------------------------------
5.27%                                       08/22/96   20,000     19,490,567
- ----------------------------------------------------------------------------
5.54%                                       08/22/96   20,000     19,464,424
- ----------------------------------------------------------------------------
5.55%                                       08/22/96   12,600     12,261,986
- ----------------------------------------------------------------------------
5.28%                                       09/19/96   20,000     19,407,466
- ----------------------------------------------------------------------------
                                                                 590,277,168
- ----------------------------------------------------------------------------

U.S. TREASURY NOTES - 13.96%

7.75%                                       03/31/96   45,000     45,071,156
- ----------------------------------------------------------------------------
9.375%                                      04/15/96   55,000     55,259,212
- ----------------------------------------------------------------------------
5.50%                                       04/30/96   50,000     50,002,051
- ----------------------------------------------------------------------------
7.625%                                      04/30/96   50,000     50,190,805
- ----------------------------------------------------------------------------
7.375%                                      05/15/96   24,000     24,079,459
- ----------------------------------------------------------------------------
7.875%                                      07/15/96    5,600      5,653,519
- ----------------------------------------------------------------------------
6.50%                                       09/30/96   50,000     50,389,032
- ----------------------------------------------------------------------------
7.00%                                       09/30/96   75,000     75,768,605
- ----------------------------------------------------------------------------
8.00%                                       10/15/96   25,000     25,413,276
- ----------------------------------------------------------------------------
7.50%                                       12/31/96  100,000    101,980,497
- ----------------------------------------------------------------------------
8.00%                                       01/15/97   50,000     51,201,029
- ----------------------------------------------------------------------------
                                                                 535,008,641
- ----------------------------------------------------------------------------
    Total U.S. Treasury Securities                             1,125,285,809
- ----------------------------------------------------------------------------
    Total Investments, excluding Repurchase
     Agreements                                                1,125,285,809
- ----------------------------------------------------------------------------
</TABLE>
 
                                       3
<PAGE>
 
<TABLE>
<CAPTION>
                                           MATURITY PAR (000)     VALUE
<S>                                        <C>      <C>       <C>
REPURCHASE AGREEMENTS(b) - 69.80%

BA Securities, Inc. 5.42%(c)               03/01/96 $140,000  $  140,000,000
- -------------------------------------------------------------------------------
BT Securities Corp.
 5.40%(d)                                        --  130,000     130,000,000
 5.45%(e)                                        --   50,000      50,000,000
- -------------------------------------------------------------------------------
Bear, Stearns & Co. 5.41%(f)                     --  140,000     140,000,000
- -------------------------------------------------------------------------------
Citicorp Securities, Inc. 5.42%(g)         03/01/96  140,000     140,000,000
- -------------------------------------------------------------------------------
Daiwa Securities America Inc. 5.44%(h)     03/01/96  261,980     261,980,380
- -------------------------------------------------------------------------------
Deutsche Bank Government Securities, Inc.
 5.44%(i)                                        --  560,000     560,000,000
- -------------------------------------------------------------------------------
Goldman, Sachs & Co.
 5.42%(j)                                  03/01/96  221,000     221,000,000
 6.00%(k)                                  03/01/96  156,494     156,493,696
- -------------------------------------------------------------------------------
Morgan (J.P.) Securities, Inc. 5.40%(l)    03/01/96  140,000     140,000,000
- -------------------------------------------------------------------------------
Nesbitt Burns Securities Inc. 5.45%(m)           --   85,000      85,000,000
- -------------------------------------------------------------------------------
Nikko Securities Co., Ltd. 5.43%(n)              --  130,000     130,000,000
- -------------------------------------------------------------------------------
Nomura Securities International, Inc.
 5.41%(o)                                        --  140,000     140,000,000
- -------------------------------------------------------------------------------
SBC Capital Markets Inc. 5.50%(p)          03/01/96  100,000     100,000,000
- -------------------------------------------------------------------------------
Smith Barney Inc. 5.40%(q)                 03/01/96  140,000     140,000,000
- -------------------------------------------------------------------------------
UBS Securities Inc. 5.43%(r)                     --  140,000     140,000,000
- -------------------------------------------------------------------------------
    Total Repurchase Agreements                                2,674,474,076
- -------------------------------------------------------------------------------

    TOTAL INVESTMENTS - 99.17%                                 3,799,759,885(s)

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

    OTHER ASSETS LESS LIABILITIES - 0.83%                         31,675,623

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

    NET ASSETS - 100.00%                                      $3,831,435,508

===============================================================================
</TABLE>
NOTES TO SCHEDULE OF INVESTMENTS:
(a) U. S. Treasury bills are traded on a discount basis. In such cases the
    interest rate shown represents the rate of discount paid or received at the
    time of purchase by the Portfolio.
(b) Collateral on repurchase agreements, including the Portfolio's pro-rata
    interest in joint repurchase agreements, is taken into possession by the
    Portfolio upon entering into the repurchase agreement. The collateral is
    marked to market daily to ensure its market value as being 102% of the
    sales price of repurchase agreement. The investments in some repurchase
    agreements are through participation in joint accounts with other mutual
    funds managed by the investment advisor.
(c) Entered into 02/29/96 with a maturing value of $140,021,078. Collateralized
    by $143,130,000 U.S. Treasury obligations, 0% to 7.125% due 09/19/96 to
    02/29/00.
(d) Open repurchase agreement entered into 02/27/95; however, either party may
    terminate the agreement upon demand. Interest rates, par and collateral are
    redetermined daily. Collateralized by $118,292,000 U.S. Treasury
    obligations, 6.25% to 8.75% due 11/15/97 to 08/15/23.
(e) Open repurchase agreement entered into 02/27/95; however, either party may
    terminate the agreement upon demand. Interest rates, par and collateral are
    redetermined daily. Collateralized by $82,755,000 U.S. Treasury
    obligations, 0% to 6.25% due 05/15/02 to 08/15/23.
(f) Open repurchase agreement entered into 07/06/95; however, either party may
    terminate the agreement upon demand. Interest rates, par and collateral are
    redetermined daily. Collateralized by $257,575,000 U.S. Treasury STRIPS due
    05/15/97 to 02/15/09.
(g) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $140,021,078. Collateralized by $133,020,000 U.S. Treasury obligations,
    6.50% to 11.75% due 04/30/97 to 11/15/14.
(h) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $311,474,334. Collateralized by $290,042,000 U.S. Treasury obligations, 0%
    to 8.875% due 05/31/96 to 08/15/17.
 
                                       4
<PAGE>
 
(i) Open joint repurchase agreement entered into 10/13/95; however, either
    party may terminate the agreement upon demand. Interest rates, par and
    collateral are redetermined daily. Collateralized by $578,194,000 U.S.
    Treasury obligations, 0% to 5.25% due 05/30/96 to 07/31/98.
(j) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $221,033,273. Collateralized by $206,274,000 U.S. Treasury obligations,
    5.25% to 7.625% due 12/31/97 to 11/15/22.
(k) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $195,032,500. Collateralized by $190,359,000 U.S. Treasury obligations,
    5.25% to 8.75% due 08/31/97 to 11/15/08.
(l) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $140,021,000. Collateralized by $96,887,000 U.S. Treasury obligations,
    12.00% due 08/15/13.
(m) Open joint repurchase agreement entered into 12/07/95; however, either
    party may terminate the agreement upon demand. Interest rates, par and
    collateral are redetermined daily. Collateralized by $409,113,000 U.S.
    Treasury obligations, 0% to 6.25% due 05/16/96 to 02/15/25.
(n) Open joint repurchase agreement entered into 12/12/94; however, either
    party may terminate the agreement upon demand. Interest rates, par and
    collateral are redetermined daily. Collateralized by $124,449,000 U.S.
    Treasury obligations, 0% to 9.125% due 03/21/96 to 08/15/22.
(o) Open joint repurchase agreement entered into 11/08/95; however, either
    party may terminate the agreement upon demand. Interest rates, par and
    collateral are redetermined daily. Collateralized by $139,203,000 U.S.
    Treasury obligations, 5.625% to 7.125% due 08/31/97 to 02/15/06.
(p) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $100,015,278. Collateralized by $189,099,000 U.S. Treasury obligations, 0%
    due 05/09/96 to 02/15/07.
(q) Joint repurchase agreement entered into 02/29/96 with a maturing value of
    $140,021,000. Collateralized by $139,845,000 U.S. Treasury obligations, 0%
    to 7.75% due 03/07/96 to 11/15/16.
(r) Open joint repurchase agreement entered into 11/29/95; however, either
    party may terminate the agreement upon demand. Interest rates, par and
    collateral are redetermined daily. Collateralized by $144,802,000 U.S.
    Treasury obligations, 0% due 03/14/96 to 07/25/96.
(s) Also represents cost for federal income tax purposes.
 
 
See Notes to Financial Statements.
 
                                       5
<PAGE>
 
STATEMENT OF ASSETS AND LIABILITIES
February 29, 1996
(Unaudited)
<TABLE>
<S>                                                       <C>

ASSETS:

Investments, excluding repurchase agreements, at value
 (amortized cost)                                         $1,125,285,809
- ------------------------------------------------------------------------
Repurchase agreements                                      2,674,474,076
- ------------------------------------------------------------------------
Receivables:
 Interest receivable                                          12,963,859
- ------------------------------------------------------------------------
 Investments sold                                             35,091,721
- ------------------------------------------------------------------------
Investment for deferred compensation plan                         39,621
- ------------------------------------------------------------------------
Other assets                                                     205,151
- ------------------------------------------------------------------------
  Total assets                                             3,848,060,237
- ------------------------------------------------------------------------
 
LIABILITIES:

Payables for:
 Dividends                                                    15,383,590
- ------------------------------------------------------------------------
 Deferred compensation                                            39,621
- ------------------------------------------------------------------------
 Amount due to custodian bank                                    550,000
- ------------------------------------------------------------------------
Accrued advisory fees                                            179,382
- ------------------------------------------------------------------------
Accrued distribution fees                                        216,085
- ------------------------------------------------------------------------
Accrued transfer agent fees                                       48,748
- ------------------------------------------------------------------------
Accrued trustees' fees                                             3,224
- ------------------------------------------------------------------------
Accrued administrative services fees                               8,428
- ------------------------------------------------------------------------
Accrued operating expenses                                       195,651
- ------------------------------------------------------------------------
  Total liabilities                                           16,624,729
- ------------------------------------------------------------------------

NET ASSETS                                                $3,831,435,508

========================================================================

NET ASSETS:

Institutional Class                                       $2,387,209,694
========================================================================
Private Investment Class                                  $  534,534,437
========================================================================
Personal Investment Class                                 $  146,630,169
========================================================================
Cash Management Class                                     $  763,061,198
========================================================================
Resource Class                                            $           10
========================================================================

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

Institutional Class                                        2,386,887,854
========================================================================
Private Investment Class                                     534,463,798
========================================================================
Personal Investment Class                                    146,610,155
========================================================================
Cash Management Class                                        762,958,252
========================================================================
Resource Class                                                        10
========================================================================

NET ASSET VALUE PER SHARE:

Net asset value, offering and redemption price per share  $         1.00
========================================================================
</TABLE>
See Notes to Financial Statements.
 
                                       6
<PAGE>
 
STATEMENT OF OPERATIONS
For the six months ended February 29, 1996
(Unaudited)
<TABLE>
<S>                                                              <C>
INVESTMENT INCOME:                                      

Interest income                                                  $97,035,383
- -----------------------------------------------------------------------------

EXPENSES:                                               

Advisory fees                                                      1,057,634
- -----------------------------------------------------------------------------
Custodian fees                                                        85,031
- -----------------------------------------------------------------------------
Administrative services fees                                          40,783
- -----------------------------------------------------------------------------
Trustees' fees and expenses                                           12,524
- -----------------------------------------------------------------------------
Transfer agent fees                                                  126,484
- -----------------------------------------------------------------------------
Distribution fees (Note 2)                                         1,102,257
- -----------------------------------------------------------------------------
Other                                                                276,780
- -----------------------------------------------------------------------------
  Total expenses                                                   2,701,493
- -----------------------------------------------------------------------------
Less expenses assumed by advisor                                     (48,000)
- -----------------------------------------------------------------------------
  Net expenses                                                     2,653,493
- -----------------------------------------------------------------------------
Net investment income                                             94,381,890
- -----------------------------------------------------------------------------
Net realized gain on sales of investments                            357,245
- -----------------------------------------------------------------------------
Net increase in net assets resulting from operations             $94,739,135
=============================================================================
</TABLE>
 
STATEMENT OF CHANGES IN NET ASSETS

For the six months ended February 29, 1996 and the year ended August 31, 1995
(Unaudited)
<TABLE>
<CAPTION>
                                               FEBRUARY 29,     AUGUST 31,
                                                   1996            1995
                                              --------------  --------------
<S>                                           <C>             <C>
OPERATIONS:

 Net investment income                        $   94,381,890  $  164,659,385
- -----------------------------------------------------------------------------
 Net realized gain on sales of investments           357,245          67,230
- -----------------------------------------------------------------------------
  Net increase in net assets resulting from
   operations                                     94,739,135     164,726,615
- -----------------------------------------------------------------------------
Distributions to shareholders from net
 investment income                               (94,381,890)   (164,659,385)
- -----------------------------------------------------------------------------
Distributions to shareholders from net
 realized gain on investments                             --         (63,547)
- -----------------------------------------------------------------------------
Share transactions-net                           571,109,591     232,658,749
- -----------------------------------------------------------------------------
  Net increase in net assets                     571,466,836     232,662,432
- -----------------------------------------------------------------------------

NET ASSETS:

  Beginning of period                          3,259,968,672   3,027,306,240
- -----------------------------------------------------------------------------
  End of period                               $3,831,435,508  $3,259,968,672
=============================================================================

NET ASSETS CONSIST OF:

  Shares of beneficial interest               $3,830,920,069  $3,259,810,478
- -----------------------------------------------------------------------------
  Undistributed net realized gain on sales of
   investments                                       515,439         158,194
- -----------------------------------------------------------------------------
                                              $3,831,435,508  $3,259,968,672
=============================================================================
</TABLE>
See Notes to Financial Statements.
 
                                       7
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS
February 29, 1996
(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.
Information presented in these financial statements pertains only to the
Treasury Portfolio (the "Portfolio"), with assets, liabilities and operations
of each portfolio being accounted for separately. The Portfolio consists of
five different classes of shares: the Institutional Class, the Private
Investment Class, the Personal Investment Class, the Cash Management Class and
the Resource Class. Matters affecting each class are voted on exclusively by
the shareholders of each class. As of February 29, 1996, the Resource Class had
not commenced operations. The Portfolio's objective is the maximization of
current income to the extent consistent with the preservation of capital and
the maintenance of liquidity.
 The following is a summary of significant accounting policies followed by the
Portfolio in the preparation of its financial statements. The preparation of
financial statements in conformity with generally accepted accounting
principles requires management to make estimates and assumptions that affect
the reported amounts of assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
A. Security Valuations - The Portfolio invests only in securities which have
   maturities of 397 days or less. The securities are valued on the basis of
   amortized cost which approximates market value. This method values a
   security at its cost on the date of purchase and thereafter assumes a
   constant amortization to maturity of any discount or premium.
B. Securities Transactions, Investment Income and Distributions - Securities
   transactions are accounted for on a trade date basis. Realized gains or
   losses are computed on the basis of specific identification of the
   securities sold. Interest income, adjusted for amortization of premiums and
   discounts on investments, is accrued daily. Dividends to shareholders are
   declared daily and are paid on the first business day of the following
   month.
C. Federal Income Taxes - The Portfolio intends to comply with the requirements
   of the Internal Revenue Code necessary to qualify as a regulated investment
   company and, as such, will not be subject to federal income taxes on
   otherwise taxable income (including net realized capital gains) which is
   distributed to shareholders. Therefore, no provision for federal income
   taxes is recorded in the financial statements.
D. Expenses - 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.
 
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 $300 million                 0.15%
- ----------------------------------------
Over $300 million to $1.5 billion  0.06%
- ----------------------------------------
Over $1.5 billion                  0.05%
- ----------------------------------------
</TABLE>
 
 AIM will, if necessary, reduce its fee for any fiscal year to the extent
required so that the amount of ordinary expenses of the Portfolio (excluding
interest, taxes, brokerage commissions and extraordinary expenses) paid or
incurred by the Portfolio for such fiscal year does not exceed the applicable
expense limitations imposed by the state securities regulations in any state in
which the Portfolio's shares are qualified for sale. AIM voluntarily reimbursed
expenses of $48,000 on the Personal Investment Class during the six months
ended February 29, 1996.
 
                                       8
<PAGE>
 
 The Portfolio, pursuant to a master administrative services agreement with
AIM, has agreed to reimburse AIM for certain costs incurred in providing
accounting services to the Portfolio. During the six months ended February 29,
1996, the Portfolio reimbursed AIM $40,783 for such services.
 The Portfolio, pursuant to a transfer agent and service agreement, has agreed
to pay A I M Institutional Fund Services, Inc. ("AIFS") a fee for providing
transfer agent and shareholder services to the Portfolio. During the six months
ended February 29, 1996, the Portfolio paid AIFS $126,484 for such services.
 Under the terms of a master distribution agreement between Fund Management
Company ("FMC") and the Fund, FMC acts as the exclusive distributor of the
Fund's shares. The Fund has adopted a master distribution plan (the "Plan")
pursuant to Rule 12b-1 under the 1940 Act with respect to the Private
Investment Class, the Personal Investment Class, the Cash Management Class and
the Resource Class of the Portfolio. The Plan provides that the Private
Investment Class, the Personal Investment Class, the Cash Management Class and
the Resource Class pay up to a 0.50%, 0.75%, 0.10%, and 0.20%, respectively,
maximum annual rate of the average daily net assets attributable to such class.
Of this amount, the Fund may pay an asset-based sales charge to FMC and the
Fund may pay a service fee of (a) 0.25% of the average daily net assets of each
of the Private Investment Class and the Personal Investment Class, (b) 0.10% of
the average daily net assets of the Cash Management Class and (c) 0.20% of the
average daily net assets of the Resource Class, to selected banks, broker-
dealers and other financial institutions who offer continuing personal
shareholder services to their customers who purchase and own shares of the
Private Investment Class, the Personal Investment Class, the Cash Management
Class or the Resource Class. Any amounts not paid as a service fee under such
Plan would constitute an asset-based sales charge. During the six months ended
February 29, 1996, the Private Investment Class, the Personal Investment Class,
the Cash Management Class and the Resource Class accrued for compensation to
FMC amounts of $635,378, $329,835, $137,045 and $0, respectively, under the
Plan. Certain officers and trustees of the Trust are officers of AIM, FMC and
AIFS.
 During the six months ended February 29, 1996, the Portfolio paid legal fees
of $7,272 for services provided by Kramer, Levin, Naftalis, Nessen, Kamin &
Frankel. A member of that firm is a trustee of the Fund.
 
NOTE 3-TRUSTEES' FEES
Trustees' fees represent remuneration paid or accrued to each trustee who is
not an "interested person" of AIM. The Fund invests trustees' fees, if so
elected by a trustee, in mutual fund shares in accordance with a deferred
compensation plan.
 
                                       9
<PAGE>
 
NOTE 4-SHARE INFORMATION
Changes in shares outstanding during the six months ended February 29, 1996 and
the year ended August 31, 1995 were as follows:
 
<TABLE>
<CAPTION>
                                 FEBRUARY 29,                       AUGUST 31,
                                     1996                              1995
                        -------------------------------  ---------------------------------
                            SHARES          AMOUNT           SHARES            AMOUNT
                        --------------  ---------------  ---------------  ----------------
<S>                     <C>             <C>              <C>              <C>
Sold:
  Institutional Class    7,300,815,732  $ 7,300,815,732   13,265,129,336  $ 13,265,129,336
- ------------------------------------------------------------------------------------------
  Private Investment
   Class                 1,763,283,441    1,763,283,441    3,483,722,415     3,483,722,415
- ------------------------------------------------------------------------------------------
  Personal Investment
   Class                   478,130,342      478,130,342      628,065,796       628,065,796
- ------------------------------------------------------------------------------------------
  Cash Management Class  1,936,631,238    1,936,631,238       97,195,296        97,195,296
- ------------------------------------------------------------------------------------------
  Resource Class*                   10               10        --                --
- ------------------------------------------------------------------------------------------
Issued as reinvestment
 of dividends:
  Institutional Class        5,625,423        5,625,423       11,558,277        11,558,277
- ------------------------------------------------------------------------------------------
  Private Investment
   Class                     1,130,900        1,130,900        2,167,906         2,167,906
- ------------------------------------------------------------------------------------------
  Personal Investment
   Class                     2,344,038        2,344,038        2,719,512         2,719,512
- ------------------------------------------------------------------------------------------
  Cash Management Class      2,294,121        2,294,121        2,671,137         2,671,137
- ------------------------------------------------------------------------------------------
  Resource Class*             --              --               --                --
- ------------------------------------------------------------------------------------------
Reacquired:
  Institutional Class   (7,589,060,727)  (7,589,060,727) (13,059,443,790)  (13,059,443,790)
- ------------------------------------------------------------------------------------------
  Private Investment
   Class                (1,624,516,813)  (1,624,516,813)  (3,504,019,234)   (3,504,019,234)
- ------------------------------------------------------------------------------------------
  Personal Investment
   Class                  (448,386,113)    (448,386,113)    (604,841,208)     (604,841,208)
- ------------------------------------------------------------------------------------------
  Cash Management Class (1,257,182,001)  (1,257,182,001)     (92,266,694)      (92,266,694)
- ------------------------------------------------------------------------------------------
  Resource Class*             --              --               --                --
- ------------------------------------------------------------------------------------------
Net increase               571,109,591  $   571,109,591      232,658,749  $    232,658,749
==========================================================================================
</TABLE>
 
* As of February 29, 1996, the Resource Class of the Portfolio had not
commenced operations.
 
                                       10
<PAGE>
 
NOTE 5-FINANCIAL HIGHLIGHTS
Shown below are the condensed financial highlights for a share outstanding of
the Institutional Class during the six months ended February 29, 1996 and each
of the years in the nine-year period ended August 31, 1995.
 
<TABLE>
<CAPTION>
                     FEBRUARY 29,
                         1996
                     ------------
<S>                  <C>
Net asset value,
 beginning of
 period               $     1.00
- ----------------      ----------
Income from
 investment
 operations:
  Net investment
   income                   0.03
- ----------------      ----------
Less
 distributions:
  Dividends from
   net
   investment
   income                  (0.03)
- ----------------      ----------
Net asset value,
 end of period        $     1.00
================      ==========
Total return                5.66%(a)
================      ==========
Ratios/supplemental
 data:
Net assets, end
 of period (000s
 omitted)             $2,387,210
================      ==========
Ratio of
 expenses to
 average net
 assets                     0.09%(b)
================      ==========
Ratio of net
 investment
 income to
 average net
 assets                     5.63%(b)
================      ==========
<CAPTION>
                                                                AUGUST 31,
                     ---------------------------------------------------------------------------------------------------------
                        1995        1994        1993        1992        1991        1990        1989        1988       1987
                     ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ---------
<S>                  <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
Net asset value,
 beginning of
 period              $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $   1.00
- -------------------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ---------
Income from
 investment
 operations:
  Net investment
   income                  0.06        0.04        0.03        0.05        0.07        0.08        0.09        0.07      0.06
- -------------------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ---------
Less
 distributions:
  Dividends from
   net
   investment
   income                 (0.06)      (0.04)      (0.03)      (0.05)      (0.07)      (0.08)      (0.09)      (0.07)    (0.06)
- -------------------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ---------
Net asset value,
 end of period       $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $     1.00  $   1.00
==================== =========== =========== =========== =========== =========== =========== =========== =========== =========
Total return               5.66%       3.53%       3.22%       4.56%       7.04%       8.52%       9.03%       6.98%     6.17%
==================== =========== =========== =========== =========== =========== =========== =========== =========== =========
Ratios/supplemental
 data:
Net assets, end
 of period (000s
 omitted)            $2,669,637  $2,452,389  $3,652,672  $3,835,387  $2,437,902  $1,703,460  $1,189,822  $1,121,144  $650,547
==================== =========== =========== =========== =========== ==========  =========== =========== =========== =========
Ratio of
 expenses to
 average net
 assets                    0.10%       0.08%       0.08%       0.09%       0.10%       0.12%       0.11%       0.13%     0.14%
==================== =========== =========== =========== =========== =========== =========== =========== =========== =========
Ratio of net
 investment
 income to
 average net
 assets                    5.53%       3.39%       3.17%       4.38%       6.73%       8.19%       8.69%       6.76%     6.01%
==================== =========== =========== =========== =========== =========== =========== =========== =========== =========
</TABLE>
(a) Annualized.
(b) Ratios are annualized and based on average net assets of $2,527,200,078.
 
                                       11
<PAGE>
 
 
<TABLE> 
<S>                                                               <C> 
                            TRUSTEES
Charles T. Bauer                           John F. Kroeger        Short-Term
Bruce L. Crockett                         Lewis F. Pennock        Investments Trust
Owen Daly II                               Ian W. Robinson        (STIT)
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        Treasury Portfolio
Carol F. Relihan            Sr. Vice President & Secretary        -----------------------------------------------------
Melville B. Cox                             Vice President        Institutional                              SEMI-
Karen Dunn Kelley                           Vice President        Class                                      ANNUAL
J. Abbott Sprague                           Vice President                                                   REPORT
Dana R. Sutton        Vice President & Assistant Treasurer
P. Michelle Grace                      Assistant Secretary
David L. Kite                          Assistant Secretary                                            FEBRUARY 29, 1996
Nancy L. Martin                        Assistant Secretary
Ofelia M. Mayo                         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
                    90 Washington Street, 11th Floor
                           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 AGENT
                  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          [LOGO APPEARS HERE]
       to persons who have received a current Fund prospectus.           FUND MANAGEMENT COMPANY
</TABLE> 



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