SHORT TERM INVESTMENTS CO /TX/
N-30B-2, 1995-04-26
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<PAGE>
 
[LOGO OF AIM APPEARS HERE]

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
               rates continued to climb. The Federal Reserve Board maintained
               its restrictive monetary policy by raising short-term interest
               rates in November and again in February, which positioned the
   [PHOTO      federal funds rate at approximately 6 percent, and the discount
 Charles T.    rate at 5.25 percent.
   Bauer,        With the last interest rate increase, financial markets
 Chairman of   strengthened as economic indicators, though mixed, suggested a
 the Board of  slower rate of growth in the economy. Such evidence prompted
   the Fund    Federal Reserve Chairman Alan Greenspan to provide encouraging
APPEARS HERE]  testimony before Congress in late February that the current
               condition of the economy-moderate, constructive growth with low
               unemployment and low inflation-was healthier than it had been in
               years. In addition, the Chairman told Congress that the central
               bank would be ready to loosen credit at the first sign of
               recession.
  Greenspan's remarks triggered a rally in stocks that drove equity markets to
record highs. Bonds also rallied, 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 the coming months.

YOUR INVESTMENT PORTFOLIO

The Short-Term Investments Co. (STIC) Prime Portfolio consistently maintained
its strict investment discipline and its superior credit quality rating of AAAm,
the highest given by Standard & Poor's Corporation, a widely known credit rating
agency. The AAAm rating is historical and is based on an annual analysis of the
Portfolio's credit quality and composition, management management, and weekly
portfolio review.
  Prime Portfolio took advantage of the rising interest rate environment.
Weighted average maturity was 17 days to capture attractive yields available in
taxable money market instruments with maturities of 60 days or less. As a
result, the yield on the Cash Management Class of Prime Portfolio was able to
increase with short-term interest rates and outperform similar funds tracked by
IBC/Donoghue's Money Fund Averages(TM).
  As of February 28, 1995, the 30-day average yield of the Cash Management Class
of Prime Portfolio was 5.93 percent, compared to 5.77 percent for the similar
First-Tier institutional funds reported in IBC/Donoghue's Money Fund
Averages(TM). The seven-day yield for the Cash Management Class of Prime
Portfolio as of February 28, 1995, was 5.95 percent, and net assets were $5.48
million.

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>
 
 
 
 
SCHEDULE OF INVESTMENTS
February 28, 1995
(Unaudited)

<TABLE>
<CAPTION>
                                      MATURITY PAR (000)     VALUE
<S>                                   <C>      <C>       <C>
COMMERCIAL PAPER - 71.11%(a)
BASIC INDUSTRIES - 1.54%

DRUGS - 0.54%

Warner-Lambert Co.
 6.03%                                03/28/95 $ 24,350  $   24,239,877
- - -----------------------------------------------------------------------

PAPER & FOREST PRODUCTS - 0.34%

Weyerhaeuser Co.
 6.05%                                03/23/95   15,250      15,193,617
- - -----------------------------------------------------------------------

MULTIPLE INDUSTRY - 0.66%

Philip Morris Companies, Inc.
 6.02%                                04/18/95   30,000      29,759,200
- - -----------------------------------------------------------------------
  Total Basic Industries                                     69,192,694
- - -----------------------------------------------------------------------

CAPITAL GOODS - 6.57%

COMPUTERS & OFFICE EQUIPMENT - 4.00%

Xerox Corp.
 6.04%                                04/12/95   39,227      38,950,580
- - -----------------------------------------------------------------------
 6.01%                                04/27/95   65,800      65,173,859
- - -----------------------------------------------------------------------
Xerox Credit Corp.
 6.05%                                04/11/95   50,000      49,655,486
- - -----------------------------------------------------------------------
 6.00%                                04/21/95   15,000      14,872,500
- - -----------------------------------------------------------------------
 6.01%                                04/25/95   11,950      11,840,276
- - -----------------------------------------------------------------------
                                                            180,492,701
- - -----------------------------------------------------------------------

MACHINERY - 2.57%

Dover Corp.
 6.02%                                03/14/95   45,250      45,151,632
- - -----------------------------------------------------------------------
 6.02%                                03/15/95   11,985      11,956,942
- - -----------------------------------------------------------------------
 5.97%                                03/21/95   19,000      18,936,983
- - -----------------------------------------------------------------------
 6.00%                                03/22/95   18,000      17,937,000
- - -----------------------------------------------------------------------
 5.97%                                03/24/95   10,000       9,961,858
- - -----------------------------------------------------------------------
 6.00%                                03/28/95   12,000      11,946,000
- - -----------------------------------------------------------------------
                                                            115,890,415
- - -----------------------------------------------------------------------
  Total Capital Goods                                       296,383,116
- - -----------------------------------------------------------------------
</TABLE>
 
 
                                       2
<PAGE>
 
 
 
 
<TABLE>
<CAPTION>
                                  MATURITY PAR (000)     VALUE
<S>                               <C>      <C>       <C>
CONSUMER DURABLES - 4.20%

AUTOMOBILE - 4.20%

Ford Motor Credit Co.
 6.00%                            03/16/95 $ 48,500  $   48,378,750
- - -------------------------------------------------------------------
 6.09%                            03/31/95   25,000      24,873,125
- - -------------------------------------------------------------------
 6.10%                            04/03/95   50,000      49,720,417
- - -------------------------------------------------------------------
 6.02%                            04/17/95   50,000      49,607,028
- - -------------------------------------------------------------------
 6.02%                            04/21/95   17,000      16,855,018
- - -------------------------------------------------------------------
  Total Consumer Durables                               189,434,338
- - -------------------------------------------------------------------

CONSUMER NONDURABLES - 1.17%

BEVERAGES - 1.17%

Seagram (Joseph E.) & Sons, Inc.
 6.07%                            04/14/95   52,972      52,579,007
- - -------------------------------------------------------------------
  Total Consumer Nondurables                             52,579,007
- - -------------------------------------------------------------------

ENERGY - 4.21%

NATURAL GAS - 1.03%

Colonial Pipeline Co.
 6.00%                            03/08/95   26,500      26,469,084
- - -------------------------------------------------------------------
 5.97%                            03/16/95   20,000      19,950,250
- - -------------------------------------------------------------------
                                                         46,419,334
- - -------------------------------------------------------------------

OIL & GAS - 3.18%

ARCO Coal Australia Inc.
 6.03%                            03/06/95   24,887      24,866,157
- - -------------------------------------------------------------------
 6.00%                            03/08/95   12,118      12,103,862
- - -------------------------------------------------------------------
 6.00%                            03/20/95   10,253      10,220,532
- - -------------------------------------------------------------------
 6.00%                            03/21/95   18,199      18,138,337
- - -------------------------------------------------------------------
 6.00%                            03/23/95   23,760      23,672,880
- - -------------------------------------------------------------------
 6.02%                            03/27/95   45,468      45,270,316
- - -------------------------------------------------------------------
 6.05%                            03/28/95    9,144       9,102,509
- - -------------------------------------------------------------------
                                                        143,374,593
- - -------------------------------------------------------------------
  Total Energy                                          189,793,927
- - -------------------------------------------------------------------
</TABLE>
 
                                       3
<PAGE>
 
 
 
 
<TABLE>
<CAPTION>
                                        MATURITY PAR (000)     VALUE
<S>                                     <C>      <C>       <C>
FINANCIAL - 48.71%

ASSET-BACKED SECURITIES - 21.56%

Asset Securitization Cooperative Corp.
 6.00%                                  03/07/95 $ 70,000  $   69,930,000
- - -------------------------------------------------------------------------
 6.00%                                  03/08/95   13,000      12,984,834
- - -------------------------------------------------------------------------
 6.00%                                  03/13/95   30,000      29,940,000
- - -------------------------------------------------------------------------
 6.00%                                  03/22/95   50,000      49,825,000
- - -------------------------------------------------------------------------
 6.00%                                  03/23/95   36,500      36,366,166
- - -------------------------------------------------------------------------
Ciesco, L.P.
 6.00%                                  03/21/95   19,000      18,936,667
- - -------------------------------------------------------------------------
 6.00%                                  04/20/95   15,000      14,875,000
- - -------------------------------------------------------------------------
Clipper Receivables Corp.
 6.03%                                  03/06/95   45,000      44,962,313
- - -------------------------------------------------------------------------
 6.00%                                  03/09/95   18,303      18,278,596
- - -------------------------------------------------------------------------
 6.00%                                  03/20/95   44,530      44,388,988
- - -------------------------------------------------------------------------
 6.02%                                  03/27/95   20,000      19,913,044
- - -------------------------------------------------------------------------
 6.03%                                  04/21/95   38,829      38,497,303
- - -------------------------------------------------------------------------
Corporate Asset Funding Co. Inc.
 6.05%                                  03/02/95   35,000      34,994,118
- - -------------------------------------------------------------------------
 6.05%                                  03/03/95   30,000      29,989,917
- - -------------------------------------------------------------------------
 6.02%                                  03/06/95   45,000      44,962,374
- - -------------------------------------------------------------------------
 6.00%                                  03/20/95   50,000      49,841,667
- - -------------------------------------------------------------------------
 6.02%                                  03/27/95   40,000      39,826,089
- - -------------------------------------------------------------------------
Delaware Funding Corp.
 6.00%                                  03/10/95   44,073      44,006,891
- - -------------------------------------------------------------------------
Falcon Asset Securitization Corp.
 5.93%                                  03/01/95   43,050      43,050,000
- - -------------------------------------------------------------------------
 6.03%                                  03/02/95   25,300      25,295,762
- - -------------------------------------------------------------------------
 6.03%                                  03/07/95   18,100      18,081,810
- - -------------------------------------------------------------------------
 6.00%                                  03/09/95   13,900      13,881,467
- - -------------------------------------------------------------------------
 6.00%                                  03/10/95   14,950      14,927,575
- - -------------------------------------------------------------------------
 6.03%                                  04/19/95   11,650      11,554,383
- - -------------------------------------------------------------------------
</TABLE>
 
                                       4
<PAGE>
 
 
 
 
<TABLE>
<CAPTION>
                                     MATURITY PAR (000)     VALUE
<S>                                  <C>      <C>       <C>
Preferred Receivables Funding Corp.
 6.05%                               03/03/95 $ 15,850  $   15,844,673
- - ----------------------------------------------------------------------
 6.03%                               03/06/95   15,025      15,012,417
- - ----------------------------------------------------------------------
 5.97%                               03/17/95   18,775      18,725,184
- - ----------------------------------------------------------------------
 6.00%                               03/20/95   44,050      43,910,508
- - ----------------------------------------------------------------------
 6.03%                               04/12/95   14,850      14,745,530
- - ----------------------------------------------------------------------
 6.08%                               04/13/95   60,300      59,862,088
- - ----------------------------------------------------------------------
 6.02%                               04/20/95   11,490      11,393,931
- - ----------------------------------------------------------------------
Sheffield Receivables Corp.
 6.07%                               03/01/95   10,000      10,000,000
- - ----------------------------------------------------------------------
 6.05%                               03/02/95   12,650      12,647,873
- - ----------------------------------------------------------------------
                                                           971,452,168
- - ----------------------------------------------------------------------

BUSINESS CREDIT - 4.20%

CIT Group Holdings, Inc.
 6.02%                               03/09/95   89,500      89,380,268
- - ----------------------------------------------------------------------
 5.90%                               03/16/95   50,000      49,877,083
- - ----------------------------------------------------------------------
 5.90%                               03/17/95   50,000      49,868,889
- - ----------------------------------------------------------------------
                                                           189,126,240
- - ----------------------------------------------------------------------

INSURANCE (LIFE) - 0.89%

MetLife Funding, Inc.
 6.02%                               03/27/95   30,309      30,177,223
- - ----------------------------------------------------------------------
 6.03%                               03/28/95   10,103      10,057,309
- - ----------------------------------------------------------------------
                                                            40,234,532
- - ----------------------------------------------------------------------

PERSONAL CREDIT - 10.59%

Associates Corp. of North America
 6.00%                               03/10/95   50,000      49,925,000
- - ----------------------------------------------------------------------
 6.00%                               03/20/95   50,000      49,841,667
- - ----------------------------------------------------------------------
 6.05%                               03/31/95   50,000      49,747,917
- - ----------------------------------------------------------------------
 6.05%                               04/14/95   35,500      35,237,496
- - ----------------------------------------------------------------------
AVCO Financial Services, Inc.
 6.00%                               03/23/95   30,000      29,890,000
- - ----------------------------------------------------------------------
 6.00%                               03/24/95   30,000      29,885,000
- - ----------------------------------------------------------------------
 6.09%                               04/03/95   31,000      30,826,943
- - ----------------------------------------------------------------------
 6.05%                               04/14/95   50,000      49,630,278
- - ----------------------------------------------------------------------
Household Finance Corp.
 6.02%                               03/21/95   77,500      77,240,806
- - ----------------------------------------------------------------------
</TABLE>
 
                                       5
<PAGE>
 
 
 
 
<TABLE>
<CAPTION>
                                   MATURITY PAR (000)     VALUE
<S>                                <C>      <C>       <C>
Transamerica Finance Corp.
 6.05%                             03/02/95 $ 20,000  $   19,996,639
- - --------------------------------------------------------------------
 6.05%                             03/03/95   55,000      54,981,513
- - --------------------------------------------------------------------
                                                         477,203,259
- - --------------------------------------------------------------------

MISCELLANEOUS - 8.24%

Hertz Corp. (The)
 6.01%                             03/23/95   22,000      21,919,199
- - --------------------------------------------------------------------
 6.00%                             03/24/95   60,000      59,770,000
- - --------------------------------------------------------------------
 6.02%                             03/24/95   30,000      29,884,617
- - --------------------------------------------------------------------
 6.04%                             04/17/95   50,000      49,605,722
- - --------------------------------------------------------------------
 6.03%                             04/21/95   31,000      30,735,183
- - --------------------------------------------------------------------
International Lease Finance Corp.
 6.00%                             03/10/95   20,000      19,970,000
- - --------------------------------------------------------------------
 6.00%                             03/22/95   34,700      34,578,550
- - --------------------------------------------------------------------
 6.00%                             03/24/95   45,000      44,827,500
- - --------------------------------------------------------------------
 6.02%                             04/17/95   18,605      18,458,775
- - --------------------------------------------------------------------
 6.00%                             04/21/95   30,000      29,745,000
- - --------------------------------------------------------------------
USAA Capital Corp.
 6.03%                             03/01/95   32,000      32,000,000
- - --------------------------------------------------------------------
                                                         371,494,546
- - --------------------------------------------------------------------
MULTIPLE INDUSTRY - 3.23%
General Electric Capital Corp.
 6.07%                             03/03/95   80,000      79,973,022
- - --------------------------------------------------------------------
 6.00%                             03/10/95   50,000      49,925,000
- - --------------------------------------------------------------------
 6.00%                             03/17/95   16,000      15,957,332
- - --------------------------------------------------------------------
                                                         145,855,354
- - --------------------------------------------------------------------
  Total Financial                                      2,195,366,099
- - --------------------------------------------------------------------

OTHER - 4.71%

DIVERSIFIED - 4.71%

BTR Dunlop Finance Inc.
 6.03%                             03/01/95   50,783      50,783,000
- - --------------------------------------------------------------------
 6.00%                             03/07/95   18,267      18,248,733
- - --------------------------------------------------------------------
 5.97%                             03/16/95   40,385      40,284,542
- - --------------------------------------------------------------------
 5.85%                             03/17/95   50,000      49,870,000
- - --------------------------------------------------------------------
 6.02%                             03/23/95   40,396      40,247,387
- - --------------------------------------------------------------------
 6.02%                             03/27/95   12,727      12,671,666
- - --------------------------------------------------------------------
  Total Other                                            212,105,328
- - --------------------------------------------------------------------
  Total Commercial Paper                               3,204,854,509
- - --------------------------------------------------------------------
</TABLE>
 
                                       6
<PAGE>
 
 
 
 
<TABLE>
<CAPTION>
                                          MATURITY PAR (000)      VALUE
<S>                                       <C>      <C>       <C>
MASTER NOTE AGREEMENTS - 9.29%

Coca-Cola Co. (The)
 5.847%(b)                                07/06/95 $100,000  $    100,000,000
- - --------------------------------------------------------------------------------
Morgan (J.P.) Securities, Inc.
 6.35%(c)                                 06/27/95   84,900        84,900,000
- - --------------------------------------------------------------------------------
 6.30%(c)                                 10/16/95   99,200        99,200,000
- - --------------------------------------------------------------------------------
Morgan Stanley Group Inc.
 6.275%(d)                                08/01/95  134,900       134,900,000
- - --------------------------------------------------------------------------------
  Total Master Note Agreements                                    419,000,000
- - --------------------------------------------------------------------------------

PROMISSORY NOTE AGREEMENT - 3.33%

Goldman, Sachs & Co.(e)
 6.31%                                    07/31/95  150,000       150,000,000
- - --------------------------------------------------------------------------------
  Total Investments (excluding Repurchase
   Agreements)                                                  3,773,854,509
- - --------------------------------------------------------------------------------

REPURCHASE AGREEMENTS(f) - 16.64%

BT Securities Corp.(g)
 6.10%                                       --       4,000         4,000,000
- - --------------------------------------------------------------------------------
Deutsche Bank Government Securities,
 Inc.(h)
 6.10%                                       --     267,000       267,000,000
- - --------------------------------------------------------------------------------
Goldman, Sachs & Co.(i)
 6.10%                                    03/01/95      810           810,079
- - --------------------------------------------------------------------------------
Prudential Securities Inc.(j)
 5.95%                                       --      76,000        76,000,000
- - --------------------------------------------------------------------------------
SBC Government Securities, Inc.(k)
 6.10%                                       --     300,000       300,000,000
- - --------------------------------------------------------------------------------
Sanwa - BGK Securities Co., L.P.(l)
 6.13%                                    03/01/95   76,000        76,000,000
- - --------------------------------------------------------------------------------
Smith Barney, Inc.(m)
 6.12%                                       --      26,000        26,000,000
- - --------------------------------------------------------------------------------
  Total Repurchase Agreements                                     749,810,079
- - --------------------------------------------------------------------------------
  TOTAL INVESTMENTS - 100.37%                                   4,523,664,588(n)
- - --------------------------------------------------------------------------------
  OTHER ASSETS LESS LIABILITIES - (0.37%)                         (16,841,914)
- - --------------------------------------------------------------------------------
  NET ASSETS - 100.00%                                       $  4,506,822,674
================================================================================
</TABLE> 
 
                                       7
<PAGE>
 
 
 
 
NOTES TO SCHEDULE OF INVESTMENTS:

(a) Some commercial paper is traded on a discount basis. In such cases the
    interest rate shown represents the rate of discount paid or received at the
    time of purchase by the Portfolio.

(b) The Portfolio may demand prepayment of the entire principal amount
    outstanding under notes purchased under the Master Note Purchase Agreement
    upon seven calendar days' notice. Interest rates on master notes are
    redetermined periodically. Rate shown is the rate in effect on February 28,
    1995.

(c) The Portfolio may demand prepayment of notes under the Master Note Purchase
    Agreement upon seven calendar days' notice. Interest rates on master notes
    are redetermined periodically. Rate shown is the rate in effect on February
    28, 1995.

(d) Master Note Purchase Agreement may be terminated by either party as of any
    business day upon not less than three business days' notice, at which time
    all amounts outstanding under the notes purchased under the Master Note
    Purchase Agreement will become payable. Interest rates on master notes are
    redetermined periodically. Rate shown is the rate in effect on February 28,
    1995.

(e) Promissory Note Agreement may be terminated by the Portfolio upon seven
    calendar days' oral notice. Interest rates on promissory notes are
    redetermined periodically. Rate shown is the rate in effect on February 28,
    1995.

(f) Collateral on repurchase agreements, including the Portfolio's pro-rata
    interest in joint repurchase agreements, is taken into possession by the
    Portfolio upon entering into the repurchase agreement. The collateral is
    marked to market daily to ensure its market value as being 102% of the
    sales price of the repurchase agreement. The investments in some repurchase
    agreements are through participation in joint accounts with other funds
    managed by the investment advisor.

(g) Open joint repurchase agreement entered into 02/27/95; however, either
    party may terminate the agreement upon demand. Interest rates are
    redetermined daily. Collateralized by $88,155,000 U.S. Treasury
    obligations, 0% due 05/15/97 to 05/15/06.

(h) Open joint repurchase agreement entered into 12/09/94; however, either
    party may terminate the agreement upon demand. Interest rates are
    redetermined daily. Collateralized by $404,388,000 U.S. Treasury
    obligations, 0% to 11.875% due 04/15/95 to 02/15/25.

(i) Joint repurchase agreement entered into 02/28/95 with a maturing value of
    $206,787,131. Collateralized by $204,407,000 U.S. Treasury obligations, 0%
    to 8.875% due 08/15/95 to 11/15/98.

(j) Open joint repurchase agreement entered into 01/23/95; however, either
    party may terminate the agreement upon demand. Interest rates are
    redetermined daily. Collateralized by $130,390,000 U.S. Government Agency
    obligations, 0% to 9.95% due 03/01/95 to 04/15/30 and $222,763,000 U.S.
    Treasury obligations, 0% to 7.875% due 09/30/98 to 05/15/17.

(k) Open joint repurchase agreement entered into 12/14/94; however, either
    party may terminate the agreement upon demand. Interest rates are
    redetermined daily. Collateralized by $112,820,000 U.S. Government Agency
    obligations, 0% to 8.25% due 04/04/95 to 09/19/01 and $448,547,000 U.S.
    Treasury obligations, 0% to 11.625% due 05/15/95 to 08/15/23.

(l) Joint repurchase agreement entered into 02/28/95 with a maturing value of
    $150,025,542. Collateralized by $153,857,000 U.S. Government Agency
    obligations, 0% due 04/03/95.

(m) Open joint repurchase agreement entered into 02/16/95; however, either
    party may terminate the agreement upon demand. Interest rates are
    redetermined daily. Collateralized by $252,438,000 U.S. Government Agency
    obligations, 0% to 8.65% due 03/30/95 to 07/15/28.

(n) Also represents cost for federal income tax purposes.
 
See Notes to Financial Statements.
 
                                       8
<PAGE>
 
 
 
 
STATEMENT OF ASSETS AND LIABILITIES
February 28, 1995
(Unaudited)

<TABLE>
<S>                                                       <C>
ASSETS:
Investments, excluding repurchase agreements, at value
 (amortized cost)                                         $3,773,854,509
- - ------------------------------------------------------------------------
Repurchase agreements                                        749,810,079
- - ------------------------------------------------------------------------
Interest receivable                                            3,161,198
- - ------------------------------------------------------------------------
Investment for deferred compensation plan                         22,453
- - ------------------------------------------------------------------------
Other assets                                                   1,452,415
- - ------------------------------------------------------------------------
  Total assets                                             4,528,300,654
- - ------------------------------------------------------------------------
LIABILITIES:
Dividends payable                                             21,120,342
- - ------------------------------------------------------------------------
Deferred compensation payable                                     22,453
- - ------------------------------------------------------------------------
Accrued advisory fees                                            208,458
- - ------------------------------------------------------------------------
Accrued distribution fees                                         62,010
- - ------------------------------------------------------------------------
Accrued transfer agent fees                                          371
- - ------------------------------------------------------------------------
Accrued operating expenses                                        64,346
- - ------------------------------------------------------------------------
  Total liabilities                                           21,477,980
- - ------------------------------------------------------------------------
NET ASSETS                                                $4,506,822,674
========================================================================
Net assets:
- - ------------------------------------------------------------------------
Institutional Class                                       $4,252,977,824
- - ------------------------------------------------------------------------
Private Investment Class                                  $  158,195,306
- - ------------------------------------------------------------------------
Personal Investment Class                                 $   90,172,213
- - ------------------------------------------------------------------------
Cash Management Class                                     $    5,477,331
- - ------------------------------------------------------------------------
NET ASSET VALUE PER SHARE:
Capital stock, $0.001 par value per share:
- - ------------------------------------------------------------------------
Institutional Class                                        4,252,990,317
- - ------------------------------------------------------------------------
Private Investment Class                                     158,195,653
- - ------------------------------------------------------------------------
Personal Investment Class                                     90,171,410
- - ------------------------------------------------------------------------
Cash Management Class                                          5,477,347
========================================================================
Net asset value, offering and redemption price per share           $1.00
========================================================================
</TABLE>
 
 
See Notes to Financial Statements.
 
                                       9
<PAGE>
 
 
 
 
STATEMENT OF OPERATIONS
For the six months ended February 28, 1995
(Unaudited)

<TABLE>
<S>                                                   <C>
INVESTMENT INCOME:
Interest income                                       $119,188,141
- - -------------------------------------------------------------------
 
EXPENSES:

Advisory fees                                            1,303,597
- - -------------------------------------------------------------------
Custodian fees                                             168,184
- - -------------------------------------------------------------------
Administrative service fees                                114,012
- - -------------------------------------------------------------------
Directors' fees and expenses                                19,633
- - -------------------------------------------------------------------
Transfer agent fees                                         22,971
- - -------------------------------------------------------------------
Distribution fees (Note 2)                                 307,186
- - -------------------------------------------------------------------
Other                                                      355,406
- - -------------------------------------------------------------------
  Total expenses                                         2,290,989
- - -------------------------------------------------------------------
Less expenses assumed by advisor                           (38,700)
- - -------------------------------------------------------------------
  Net expenses                                           2,252,289
- - -------------------------------------------------------------------
Net investment income                                  116,935,852
- - -------------------------------------------------------------------
Net increase in net assets resulting from operations  $116,935,852
===================================================================
</TABLE>
 
 
See Notes to Financial Statements.
 
                                       10
<PAGE>
 
 
 
 
STATEMENT OF CHANGES IN NET ASSETS
For the six months ended February 28, 1995 and the year ended August 31, 1994
(Unaudited)

<TABLE>
<S>                                          <C>             <C>
                                                  1995            1994
- - ----------------------------------------------------------------------------

OPERATIONS:

  Net investment income                      $  116,935,852  $  155,832,059
- - ----------------------------------------------------------------------------
  Net increase in net assets resulting from
   operations                                   116,935,852     155,832,059
- - ----------------------------------------------------------------------------
Distributions to shareholders from net
 investment income                             (116,935,852)   (155,832,059)
- - ----------------------------------------------------------------------------
Share transactions -- net                       391,809,323    (253,692,887)
- - ----------------------------------------------------------------------------
  Net increase (decrease) in net assets         391,809,323    (253,692,887)
- - ----------------------------------------------------------------------------
 
NET ASSETS:

  Beginning of period                         4,115,013,351   4,368,706,238
- - ----------------------------------------------------------------------------
  End of period                              $4,506,822,674  $4,115,013,351
============================================================================

NET ASSETS CONSIST OF:

  Capital (par value and additional paid-in) $4,506,834,727  $4,115,025,404
- - ----------------------------------------------------------------------------
  Undistributed net realized gain (loss) on
   sales of investments                             (12,053)        (12,053)
- - ----------------------------------------------------------------------------
                                             $4,506,822,674  $4,115,013,351
============================================================================
</TABLE>
 
 
See Notes to Financial Statements.
 
                                       11
<PAGE>
 
 
 
 
NOTES TO FINANCIAL STATEMENTS
February 28, 1995
(Unaudited)

NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES
 Short-Term Investments Co. (the "Fund") is registered under the Investment
Company Act of 1940, as amended, as an open-end series diversified management
investment company. The Fund is organized as a Maryland corporation consisting
of two different portfolios, the Prime Portfolio which offers separate classes
of shares and the Liquid Assets Portfolio. Information presented in these
financial statements pertains only to the Prime Portfolio (the "Portfolio").
The assets, liabilities and operations of each Portfolio are accounted for
separately. The Portfolio consists of four different classes of shares: the
Institutional Class, the Private Investment Class, the Personal Investment
Class, and the Cash Management Class.
 The following is a summary of the significant accounting policies followed by
the Portfolio in the preparation of its financial statements.
A. Security Valuations - The Portfolio invests only in securities which have
   maturities of sixty days or less. The securities are valued on the basis of
   amortized cost which approximates market value. This method values a
   security at its cost on the date of purchase and thereafter assumes a
   constant amortization to maturity of any discount or premium.
B. Securities Transactions, Investment Income and Distributions - Securities
   transactions are accounted for on a trade date basis. Realized gains or
   losses are computed on the basis of specific identification of the
   securities sold. Interest income, adjusted for amortization of premiums and
   discounts on investments, is accrued daily. Dividends to shareholders are
   declared daily and are paid on the first business day of the following
   month.
C. Federal Income Taxes - The Portfolio intends to comply with the requirements
   of the Internal Revenue Code necessary to qualify as a regulated investment
   company and, as such, will not be subject to federal income taxes on
   otherwise taxable income (including net realized capital gains) which is
   distributed to shareholders. Therefore, no provision for federal income
   taxes is recorded in the financial statements.
D. Expenses - Operating expenses directly attributable to a 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.
 
                                       12
<PAGE>
 
 
 
 
NOTE 2 - ADVISORY FEES AND OTHER TRANSACTIONS WITH AFFILIATES

 The Fund has entered into a master investment advisory agreement with A I M
Advisors, Inc. ("AIM"). Under the terms of the master advisory agreement, AIM
receives a monthly fee with respect to the Portfolio calculated by applying a
monthly rate, based upon the following annual rates, to the average daily net
assets of the Portfolio:
 
<TABLE>
<CAPTION>
NET ASSETS                         RATE
- - ----------------------------------------
<S>                                <C>
First $100 million                 0.20%
- - ----------------------------------------
Over $100 million to $200 million  0.15%
- - ----------------------------------------
Over $200 million to $300 million  0.10%
- - ----------------------------------------
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 $12,000 on the Prime Portfolio-Private Investment Class, $11,100 on
the Prime Portfolio-Personal Investment Class and $15,600 on the Prime
Portfolio-Cash Management Class during the six months ended February 28, 1995.
 The Portfolio, pursuant to a master administrative services agreement with
AIM, has agreed to reimburse AIM for certain costs incurred in providing
accounting and shareholder services to the Portfolio. During the six months
ended February 28, 1995, the Portfolio reimbursed AIM $114,012 for such
services. Effective September 16, 1994, A I M Institutional Fund Services
("AIFS") became a transfer agent to the Fund.
 Under the terms of a master distribution agreement between Fund Management
Company ("FMC") and the Fund, FMC acts as the exclusive distributor of the
Fund's shares. The Fund has adopted a master distribution plan (the "Plan")
pursuant to Rule 12b-1 under the 1940 Act with respect to the Private
Investment Class, Personal Investment Class and the Cash Management Class of
the Portfolio. The Plan provides that the Portfolio's Private Investment Class,
Personal Investment Class and the Cash Management Class may pay up to a 0.50%,
0.75% and 0.10%, respectively, maximum annual rate of the average daily net
assets attributable to such class. Of this amount, the Fund may pay an asset-
based sales charge to FMC and the Fund may pay a service fee of (a) 0.25% of
the average daily net assets of each of the Private Investment Class and the
Personal Investment Class and (b) 0.10% of the average daily net assets of the
Cash Management Class, to selected banks, broker-dealers and other financial
institutions who offer continuing personal shareholder services to their
customers who purchase and own shares of the Private Investment Class, the
Personal Investment Class or the Cash Management Class. Any amounts not paid as
a service fee under such Plan would constitute an asset-based sales charge.
During the six months ended February 28, 1995, the Prime Portfolio-Private
Investment Class, the Prime Portfolio-Personal Investment Class and Prime
Portfolio-Cash Management Class accrued for compensation to FMC of $126,331,
$179,502 and $1,353, respectively, under the Plan. Certain officers and
directors of the Fund are officers of AIM, FMC and AIFS.
 The Portfolio paid legal fees of $3,247 for services rendered by Reid & Priest
as counsel to the Board of Directors. In September 1994, Kramer, Levin,
Naftalis, Nessen, Kamin & Frankel was appointed as counsel to the Board of
Directors. The Portfolio paid legal fees of $2,845 for services rendered by
that firm as counsel. A director of the Fund is a member of Kramer, Levin,
Naftalis, Nessen, Kamin & Frankel and was a member of the firm of Reid & Priest
prior to September 1994.
 
                                       13
<PAGE>
 
 
 
 
NOTE 3 - DIRECTORS' FEES

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

 Changes in shares outstanding during 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>
PRIME PORTFOLIO:

Sold:
  Institutional Class     18,965,435,968  $ 18,965,435,968   33,826,759,958  $ 33,826,759,958
- - ----------------------------------------------------------------------------------------------
  Private Investment
   Class                     565,653,545       565,653,545      120,927,192       120,927,192
- - ----------------------------------------------------------------------------------------------
  Personal Investment
   Class                     434,495,218       434,495,218       15,823,134        15,823,134
- - ----------------------------------------------------------------------------------------------
  Cash Management Class*      69,558,097        69,558,097       25,113,434        25,113,434
- - ----------------------------------------------------------------------------------------------
Issued as reinvestment
 of dividends:
  Institutional Class          1,479,804         1,479,804          527,557           527,557
- - ----------------------------------------------------------------------------------------------
  Private Investment
   Class                       1,642,137         1,642,137            3,982             3,982
- - ----------------------------------------------------------------------------------------------
  Personal Investment
   Class                       1,756,766         1,756,766           39,701            39,701
- - ----------------------------------------------------------------------------------------------
  Cash Management Class*          88,722            88,722            5,586             5,586
- - ----------------------------------------------------------------------------------------------
Reacquired:
  Institutional Class    (18,794,679,916)  (18,794,679,916) (34,096,489,905)  (34,096,489,905)
- - ----------------------------------------------------------------------------------------------
  Private Investment
   Class                    (439,933,815)     (439,933,815)    (107,954,443)     (107,954,443)
- - ----------------------------------------------------------------------------------------------
  Personal Investment
   Class                    (349,145,707)     (349,145,707)     (13,702,087)      (13,702,087)
- - ----------------------------------------------------------------------------------------------
  Cash Management Class*     (64,541,496)      (64,541,496)     (24,746,996)      (24,746,996)
- - ----------------------------------------------------------------------------------------------
Net increase (decrease)      391,809,323  $    391,809,323     (253,692,887) $   (253,692,887)
==============================================================================================
</TABLE>
 
* The Prime Portfolio-Cash Management Class commenced operations on June 30,
1994.
 
                                       14
<PAGE>
 
 
 
 
NOTE 5 - FINANCIAL HIGHLIGHTS

  Shown below are the condensed financial highlights for a share outstanding of
the Prime Portfolio-Cash Management Class during the six months ended February
28, 1995 and the period June 30, 1994 (date operations commenced) through
August 31, 1994.
 
<TABLE>
<CAPTION>
                          FEBRUARY 28,  AUGUST 31,
                              1995         1994
                          ------------  ----------
<S>                       <C>           <C>
Net asset value,
 beginning of period          $1.00        $1.00
- - ------------------------     ------       ------
Income from investment
 operations:
  Net investment income        0.03        0.007
- - ------------------------     ------       ------
  Total from investment
   operations                  0.03        0.007
- - ------------------------     ------       ------
Less distributions:
  Dividends from net
   investment income          (0.03)      (0.007)
- - ------------------------     ------       ------
Net asset value, end of
 period                       $1.00        $1.00
========================     ======       ======
Total return(a)                5.31%        4.34%
========================     ======       ======
Ratios/supplemental data
Net assets, end of
 period (000s omitted)       $5,477         $372
========================     ======       ======
Ratio of expenses to
 average net assets            0.17%(b)     0.14%(c)
========================     ======       ======
Ratio of net investment
 income to average net
 assets                        5.25%(b)     4.26%(c)
========================     ======       ======
</TABLE>

(a) Total returns for periods less than one year are annualized.

(b) Ratios are annualized and based on average net assets of $3,409,166. Had
    there been no expense reimbursements, the ratios of expenses and net
    investment income to average net assets would have been 1.09% and 4.32%,
    respectively.

(c) Ratios are annualized. Had there been no expense reimbursements, the ratios
    of expenses and net investment income to average net assets would have been
    0.65% and 3.75%, respectively.
 
                                       15
<PAGE>
 
 
                         DIRECTORS
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
William H. Kleh                       Sr. Vice President
Gary T. Crum                          Sr. Vice President
Polly A. Ahrendts                         Vice President
Melville B. Cox                           Vice President
Karen Dunn Kelley                         Vice President
J. Abbott Sprague                         Vice President
Carol F. Relihan              Vice President & Secretary
Dana R. Sutton      Vice President & Assistant Treasurer
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 DIRECTORS
                Kramer, Levin, Naftalis, Nessen, Kamin & Frankel
                                919 Third Avenue
                               New York, NY 10022

                                 TRANSFER AGENT
                         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 Co.
                                                       (STIC)


                                                       Prime Portfolio
                                                       Cash
                                                       Management
                                                       Class

                                                       Semi-
                                                       Annual
                                                       Report

                                                       February 28, 1995

                                                       [LOGO OF FUND MANAGEMENT
                                                        COMPANY APPEARS HERE]



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