SHORT TERM INVESTMENTS CO /TX/
N-30D, 2000-05-09
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<PAGE>

 [AIM LOGO APPEARS HERE]        Dear Shareholder:
- --Registered Trademark--

                 [PHOTO of      As the end of the six-month reporting period
             Charles T. Bauer,  arrived, the U.S. economy continued to move
              Chairman of the   ahead at a lively pace. The Federal Reserve
LETTER       Board of The Fund  Board (the Fed) increased the key federal funds
TO OUR         APPEARS HERE]    rate a total of 75 basis points during 1999. At
SHAREHOLDERS                    the beginning of this reporting period, the
                 Fed's primary focus was to stabilize the markets in
                 anticipation of a potential Y2K-related liquidity crisis. Y2K
                 thankfully turned out to be a non-event. As 2000 began, the
                 robust domestic economy (coupled with inflationary tendencies
                 in certain commodity prices) compelled the Fed to increase the
                 federal funds rate 25 basis points on March 21 to 6.00%. The
                 Fed will most likely continue to increase short-term rates to
                 contain the equity markets' high growth performance; there is a
                 strong consensus among financial markets that the Fed will
                 increase rates by 25 basis points at the May 16 meeting. If the
                 rate hikes do halt or slow the equity markets' activity, the
                 money market sector anticipates more incoming cash as the year
                 progresses.

                 YOUR INVESTMENT PORTFOLIO

                 As of February 29, 2000, the performance of the portfolio's
                 Reserve Class was competitive with the performance reported for
                 its comparative indexes; its average monthly yield was 5.01%,
                 and its seven-day yield was 5.04%. On February 28, 2000, the
                 Liquid Assets Portfolio reached record assets of $20.5 billion.
                 The weighted average maturity (WAM) remained in the 22- to 35-
                 day range. At the close of the period, the WAM was 24 days. Net
                 assets of the Reserve Class stood at $108,325 at the close of
                 the reporting period.
                   The portfolio continues to hold the highest credit-quality
                 ratings given by three widely known credit-rating agencies:
                 AAAm from Standard & Poor's, Aaa from Moody's and AAA from
                 Fitch IBCA. These historical ratings are based on an analysis
                 of the portfolio's credit quality, composition, management and
                 weekly portfolio reviews. AIM is the largest multi-fund complex
                 to have all its institutional money market portfolios given the
                 highest rating by three nationally recognized ratings agencies,
                 according to IBC Financial Data, Inc.
                   The Liquid Assets Portfolio invests solely in securities
                 rated "first-tier" as defined in Rule 2a-7 under the Investment
                 Companies Act of 1940. Its objective is to provide as high a
                 level of current income as is consistent with the preservation
                 of capital and liquidity. Using a modified barbell maturity
                 structure, portfolio management emphasizes superior credit
                 quality in buying money market securities such as commercial
                 paper and selected repurchase-agreement securities. An
                 investment in a money market fund is not insured or guaranteed
                 by the Federal Deposit Insurance Corporation or any other
                 government agency. Although a money market fund seeks to
                 preserve the value of your investment at $1.00 per share, it is
                 possible to lose money investing in the fund.

                                                                     (continued)
<PAGE>

                 OUTLOOK FOR THE FUTURE

                 Gross domestic product growth for the fourth quarter of 1999
                 was at an annualized rate of 7.3%, and for the year 4.2%. There
                 is no evidence of a slowdown; there is no inventory drop-off,
                 and consumer spending continues to increase. February's rate
                 increase has had a minimal effect on the U.S. economy, which
                 continues full steam ahead. The Fed will probably continue to
                 raise interest rates until a substantial correction occurs
                 within the equity markets. In February, the current period of
                 economic expansion became the longest in U.S. history. Many
                 analysts expect this growth to continue through at least the
                 first half of 2000. It seems that the same story that dogged
                 markets in 1999 is so far continuing, with persistent upward
                 pressure on interest rates.
                   We are pleased to send you this report on your investment.
                 AIM is committed to the primary goals of safety, liquidity and
                 yield in institutional fund management. We are also dedicated
                 to customer service, and we are ready to respond to your
                 comments about this report. If you have any questions, please
                 contact one of our representatives at 800-659-1005 if we may
                 help.

                 Respectfully submitted,


                 /s/ CHARLES T BAUER
                 Charles T. Bauer
                 Chairman

                                       2
<PAGE>

SCHEDULE OF INVESTMENTS
February 29, 2000
(Unaudited)

<TABLE>
<CAPTION>
                                                       PAR
                                         MATURITY     (000)       VALUE
<S>                                      <C>      <C>        <C>
COMMERCIAL PAPER - 25.93%(a)

CONSUMER DURABLES - 0.36%

AUTOMOBILE - 0.36%

Daimler-Chrysler North America Holding
 5.87%                                   03/22/00 $   23,000 $    22,921,244
- ----------------------------------------------------------------------------
 5.82%                                   03/31/00     50,000      49,757,500
- ----------------------------------------------------------------------------
  Total Consumer Durables                                         72,678,744
- ----------------------------------------------------------------------------

FINANCIAL - 25.57%

ASSET BACKED SECURITIES-COMMERCIAL LOANS/LEASES - 0.51%

Centric Capital Corp.
 5.75%                                   03/15/00     25,000      24,944,097
- ----------------------------------------------------------------------------
 5.97%                                   07/25/00     43,900      42,837,107
- ----------------------------------------------------------------------------
Fleet Funding Corp.
 5.78%                                   03/13/00     35,000      34,932,566
- ----------------------------------------------------------------------------
                                                                 102,713,770
- ----------------------------------------------------------------------------

ASSET BACKED SECURITIES-CONSUMER RECEIVABLES - 0.94%

Thunder Bay Funding Inc.
 5.79%                                   03/24/00     45,148      44,980,990
- ----------------------------------------------------------------------------
 5.90%                                   04/03/00     70,098      69,718,887
- ----------------------------------------------------------------------------
 5.86%                                   04/19/00     74,774      74,177,593
- ----------------------------------------------------------------------------
                                                                 188,877,470
- ----------------------------------------------------------------------------

ASSET BACKED SECURITIES-MULTI-PURPOSE - 11.58%

Aspen Funding Corp.
 5.77%                                   03/07/00     25,000      24,975,958
- ----------------------------------------------------------------------------
 6.05%                                   10/10/00     50,000      48,126,181
- ----------------------------------------------------------------------------
Barton Capital Corp.
 5.80%                                   03/07/00    100,000      99,903,332
- ----------------------------------------------------------------------------
 5.78%                                   03/09/00     41,425      41,371,792
- ----------------------------------------------------------------------------
 5.89%                                   04/25/00     27,000      26,757,038
- ----------------------------------------------------------------------------
Bavaria TRR Corp.
 5.92%                                   03/17/00     50,000      49,868,444
- ----------------------------------------------------------------------------
 5.92%                                   03/23/00     48,000      47,826,347
- ----------------------------------------------------------------------------
Clipper Receivables Corp.
 5.78%                                   03/14/00     30,000      29,937,383
- ----------------------------------------------------------------------------
Corporate Receivables Corp.
 5.73%                                   03/02/00     75,000      74,988,063
- ----------------------------------------------------------------------------
</TABLE>

                                       3
<PAGE>

<TABLE>
<CAPTION>
                                                       PAR
                                         MATURITY     (000)        VALUE
<S>                                      <C>      <C>        <C>
ASSET BACKED SECURITIES-MULTI-PURPOSE - (CONTINUED)

Edison Asset Securitization, L.L.C.
 5.75%                                   03/02/00 $   25,000 $    24,996,007
- ----------------------------------------------------------------------------
 5.84%                                   03/07/00     49,591      49,542,731
- ----------------------------------------------------------------------------
 5.78%                                   03/10/00     35,000      34,949,425
- ----------------------------------------------------------------------------
 5.83%                                   03/10/00     50,000      49,927,125
- ----------------------------------------------------------------------------
 5.93%                                   03/10/00     50,000      49,925,875
- ----------------------------------------------------------------------------
 5.75%                                   03/15/00     78,643      78,467,146
- ----------------------------------------------------------------------------
 5.92%                                   03/17/00     75,000      74,802,667
- ----------------------------------------------------------------------------
 5.81%                                   03/20/00     35,000      34,892,676
- ----------------------------------------------------------------------------
 5.87%                                   03/22/00     42,923      42,776,024
- ----------------------------------------------------------------------------
Enterprise Funding Corp.
 5.78%                                   03/27/00     35,140      34,993,310
- ----------------------------------------------------------------------------
Falcon Asset Securitization Corp.
 5.75%                                   03/03/00    155,850     155,800,215
- ----------------------------------------------------------------------------
 5.80%                                   03/10/00     55,025      54,945,214
- ----------------------------------------------------------------------------
 5.80%                                   03/13/00     20,000      19,961,333
- ----------------------------------------------------------------------------
 5.80%                                   03/23/00     22,000      21,922,022
- ----------------------------------------------------------------------------
 5.88%                                   04/11/00     50,000      49,665,167
- ----------------------------------------------------------------------------
Monte Rosa Capital Corp.
 5.98%                                   03/09/00     50,000      49,933,555
- ----------------------------------------------------------------------------
 5.85%                                   03/14/00     40,000      39,915,500
- ----------------------------------------------------------------------------
 5.84%                                   03/14/00     80,456      80,286,327
- ----------------------------------------------------------------------------
Newport Funding Corp.
 6.05%                                   10/10/00     50,000      48,126,181
- ----------------------------------------------------------------------------
 6.22%                                   11/17/00     75,000      71,617,875
- ----------------------------------------------------------------------------
Park Avenue Receivables Corp.
 5.81%                                   03/08/00     35,000      34,960,460
- ----------------------------------------------------------------------------
 5.80%                                   03/15/00     50,000      49,887,222
- ----------------------------------------------------------------------------
 5.90%                                   03/16/00     55,370      55,233,882
- ----------------------------------------------------------------------------
Preferred Receivables Funding Corp.
 5.83%                                   03/21/00     16,085      16,032,903
- ----------------------------------------------------------------------------
 5.80%                                   03/21/00     38,185      38,061,959
- ----------------------------------------------------------------------------
Quincy Capital Corp.
 5.75%                                   03/13/00     48,374      48,281,283
- ----------------------------------------------------------------------------
 5.75%                                   03/16/00    107,742     107,483,868
- ----------------------------------------------------------------------------
Sheffield Receivables Corp.
 5.79%                                   03/07/00     81,200      81,121,642
- ----------------------------------------------------------------------------
 5.75%                                   03/10/00     58,000      57,916,625
- ----------------------------------------------------------------------------
 5.81%                                   03/17/00    118,770     118,463,309
- ----------------------------------------------------------------------------
 5.79%                                   03/21/00    130,000     129,581,833
- ----------------------------------------------------------------------------
Three Rivers Funding Corp.
 5.81%                                   03/16/00     74,772      74,590,989
- ----------------------------------------------------------------------------
                                                               2,322,816,888
- ----------------------------------------------------------------------------
</TABLE>

                                       4
<PAGE>

<TABLE>
<CAPTION>

                                                      PAR
                                        MATURITY     (000)        VALUE
<S>                                     <C>      <C>        <C>
ASSET BACKED SECURITIES-TRADE RECEIVABLES - 1.69%

Asset Securitization Cooperative Corp.
 6.20%                                  03/27/00 $   25,000 $    24,999,820
- ---------------------------------------------------------------------------
Blue Ridge Asset Funding Corp.
 5.80%                                  03/10/00     25,920      25,882,416
- ---------------------------------------------------------------------------
 5.81%                                  03/20/00     39,011      38,891,377
- ---------------------------------------------------------------------------
Corporate Asset Funding Co.
 5.80%                                  03/08/00     75,000      74,915,417
- ---------------------------------------------------------------------------
Variable Funding Capital
 5.79%                                  03/20/00    150,000     149,541,625
- ---------------------------------------------------------------------------
 5.97%                                  07/17/00     26,093      25,495,862
- ---------------------------------------------------------------------------
                                                                339,726,517
- ---------------------------------------------------------------------------

BANKS (MAJOR REGIONAL) - 0.73%

ABN-Amro Bank
 5.93%                                  07/13/00     75,000      73,345,938
- ---------------------------------------------------------------------------
 5.97%                                  08/07/00     75,000      73,022,438
- ---------------------------------------------------------------------------
                                                                146,368,376
- ---------------------------------------------------------------------------

BANKS (MONEY CENTER) - 0.35%

Citicorp
 5.80%                                  03/09/00     50,000      49,935,556
- ---------------------------------------------------------------------------
 5.80%                                  03/13/00     20,000      19,961,333
- ---------------------------------------------------------------------------
                                                                 69,896,889
- ---------------------------------------------------------------------------

BANKS (REGIONAL) - 0.97%

Bank of America Corp.
 5.96%                                  07/31/00    100,000      97,483,556
- ---------------------------------------------------------------------------
 6.09%                                  08/18/00    100,000      97,124,167
- ---------------------------------------------------------------------------
                                                                194,607,723
- ---------------------------------------------------------------------------

BROKERAGE/INVESTMENTS  - 0.68%

Credit Suisse First Boston, Inc.
 5.79%                                  03/03/00     35,000      34,988,742
- ---------------------------------------------------------------------------
 5.77%                                  03/17/00     50,800      50,669,726
- ---------------------------------------------------------------------------
Morgan Stanley Dean Witter & Co.
 5.88%                                  03/08/00     50,000      49,942,833
- ---------------------------------------------------------------------------
                                                                135,601,301
- ---------------------------------------------------------------------------

CONSUMER FINANCE - 3.00%

General Motors Acceptance Corp.
 5.84%                                  03/01/00     50,000      50,000,000
- ---------------------------------------------------------------------------
 5.88%                                  03/01/00    200,000     200,000,000
- ---------------------------------------------------------------------------
 5.89%                                  04/03/00     50,000      49,730,018
- ---------------------------------------------------------------------------
 5.93%                                  04/03/00    200,000     198,912,818
- ---------------------------------------------------------------------------
Bank One Financial Corp.
 5.90%                                  03/24/00     30,000      29,886,917
- ---------------------------------------------------------------------------
</TABLE>

                                       5
<PAGE>

<TABLE>
<CAPTION>
                                                      PAR
                                        MATURITY     (000)         VALUE
<S>                                     <C>      <C>        <C>
CONSUMER FINANCE  - (CONTINUED)

 5.80%                                  03/29/00 $   25,000 $    24,887,222
- ---------------------------------------------------------------------------
 5.74%                                  05/26/00     50,000      49,314,389
- ---------------------------------------------------------------------------
                                                                602,731,364
- ---------------------------------------------------------------------------

FINANCIAL - DIVERSIFIED - 4.37%

Associates First Capital Corp.
 5.89%                                  03/01/00    141,000     141,000,000
- ---------------------------------------------------------------------------
GE Capital International Funding, Inc.
 5.82%                                  03/03/00     75,000      74,975,750
- ---------------------------------------------------------------------------
 5.90%                                  03/07/00     50,000      49,950,833
- ---------------------------------------------------------------------------
 5.87%                                  03/08/00     50,000      49,942,931
- ---------------------------------------------------------------------------
 5.89%                                  03/09/00     50,000      49,934,556
- ---------------------------------------------------------------------------
 5.83%                                  03/14/00     50,000      49,894,736
- ---------------------------------------------------------------------------
 5.75%                                  03/27/00    100,000      99,584,722
- ---------------------------------------------------------------------------
 5.74%                                  05/12/00     75,000      74,139,000
- ---------------------------------------------------------------------------
General Electric Capital Corp.
 6.07%                                  08/17/00     50,000      48,575,236
- ---------------------------------------------------------------------------
 6.06%                                  08/28/00     68,000      65,939,600
- ---------------------------------------------------------------------------
General Electric Capital Services
 5.82%                                  03/03/00     75,000      74,975,750
- ---------------------------------------------------------------------------
 6.06%                                  08/28/00     75,000      72,727,500
- ---------------------------------------------------------------------------
National Rural Utilities Coop
 5.75%                                  03/14/00     25,000      24,948,090
- ---------------------------------------------------------------------------
                                                                876,588,704
- ---------------------------------------------------------------------------

OIL & GAS (REFINING) - 0.50%

Shell Oil Co.
 5.91%                                  04/14/00     76,832      76,832,000
- ---------------------------------------------------------------------------
United Technologies Corp.
 5.95%                                  03/03/00     24,000      23,992,067
- ---------------------------------------------------------------------------
                                                                100,824,067
- ---------------------------------------------------------------------------

TELEPHONE - 0.25%

American Telephone and Telegraph Corp.
 5.70%                                  03/16/00     50,000      49,881,250
- ---------------------------------------------------------------------------
  Total Financial                                             5,130,634,319
- ---------------------------------------------------------------------------
  Total Commercial Paper (Cost
   $5,203,313,063)                                            5,203,313,063
- ---------------------------------------------------------------------------

BANK NOTES - 0.87%

American Express Centurion Bank
 5.89%                                  03/29/00     50,000      50,000,000
- ---------------------------------------------------------------------------
Bank of America Corp.
 6.33%                                  10/04/00    100,000     100,000,000
- ---------------------------------------------------------------------------
National City Bank Cleveland
 5.95%(b)                               04/03/00     25,000      24,999,119
- ---------------------------------------------------------------------------
  Total Bank Notes (Cost $174,999,119)                          174,999,119
- ---------------------------------------------------------------------------
</TABLE>

                                       6
<PAGE>

<TABLE>
<CAPTION>
                                                  PAR
                                    MATURITY     (000)        VALUE
<S>                                 <C>      <C>        <C>
CERTIFICATES OF DEPOSIT - 9.77%

ABN-Amro Bank
 5.79%                              03/16/00 $   75,000     $75,000,155
- -----------------------------------------------------------------------
 5.71%                              07/03/00     25,000      24,996,747
- -----------------------------------------------------------------------
Bank Austria
 5.84%                              03/22/00    100,000     100,000,578
- -----------------------------------------------------------------------
 5.65%                              07/06/00     25,000      24,995,832
- -----------------------------------------------------------------------
 6.48%                              11/06/00     50,000      50,000,000
- -----------------------------------------------------------------------
Barclays Bank PLC
 5.61%                              06/14/00     25,000      24,996,553
- -----------------------------------------------------------------------
Canadian Imperial Bank of Commerce
 5.80%                              03/17/00    100,000     100,000,440
- -----------------------------------------------------------------------
 6.32%                              10/30/00     75,000      75,000,000
- -----------------------------------------------------------------------
Chase-USA-Delaware
 5.37%                              05/22/00     25,000      24,998,111
- -----------------------------------------------------------------------
Credit Communai de Belgique
 5.93%                              09/29/00     35,000      34,904,372
- -----------------------------------------------------------------------
Deutsche Bank Securities, Inc.
 5.80%                              03/21/00    100,000     100,000,000
- -----------------------------------------------------------------------
 5.89%                              03/31/00    100,000     100,000,000
- -----------------------------------------------------------------------
 5.29%                              05/19/00     25,000      24,997,138
- -----------------------------------------------------------------------
Dresdner Bank
 5.80%                              03/13/00     75,000      75,000,000
- -----------------------------------------------------------------------
First Union National Bank
 6.29%                              04/27/00     66,000      66,000,000
- -----------------------------------------------------------------------
 6.27%                              05/10/00     85,000      85,000,000
- -----------------------------------------------------------------------
Huntington National Bank
 6.33%                              10/16/00     75,000      75,000,000
- -----------------------------------------------------------------------
National City Bank
 6.55%                              01/31/01     50,000      49,978,134
- -----------------------------------------------------------------------
National Westminster Bank
 5.82%                              03/27/00    100,000     100,000,000
- -----------------------------------------------------------------------
 5.67%                              07/03/00     25,000      24,997,559
- -----------------------------------------------------------------------
 6.32%                              10/27/00    100,000     100,003,180
- -----------------------------------------------------------------------
Rabobank Nederland
 5.87%                              03/31/00    100,000     100,000,000
- -----------------------------------------------------------------------
 6.30%                              10/26/00     50,000      50,000,000
- -----------------------------------------------------------------------
Svenska Handelsbanken AB
 6.39%                              10/26/00    100,000     100,000,000
- -----------------------------------------------------------------------
 6.48%                              11/06/00     50,000      50,000,000
- -----------------------------------------------------------------------
 6.50%                              01/29/01     50,000      49,978,261
- -----------------------------------------------------------------------
Toronto-Dominion Bank
 5.80%                              03/20/00     75,000      75,000,392
- -----------------------------------------------------------------------
 5.88%                              03/31/00     50,000      50,000,166
- -----------------------------------------------------------------------
</TABLE>

                                       7
<PAGE>

<TABLE>
<CAPTION>
                                                         PAR
                                           MATURITY     (000)        VALUE
<S>                                        <C>      <C>        <C>
CERTIFICATES OF DEPOSIT - (continued)

U.S. Bank NA Minneapolis
 5.95%                                     05/16/00 $   50,000    $ 50,000,000
- ------------------------------------------------------------------------------
 5.68%                                     06/12/00     25,000      25,000,000
- ------------------------------------------------------------------------------
UBS AG
 5.24%                                     03/01/00     25,000      25,000,000
- ------------------------------------------------------------------------------
 5.35%                                     05/30/00     25,000      24,997,039
- ------------------------------------------------------------------------------
 5.60%                                     06/14/00     25,000      24,996,552
- ------------------------------------------------------------------------------
  Total Certificates of Deposit (Cost
   $1,960,841,209)                                               1,960,841,209
- ------------------------------------------------------------------------------

MASTER NOTE AGREEMENTS - 4.31%

Merrill Lynch Mortgage Capital Inc.
 6.20%(c)                                  08/17/00    357,000     357,000,000
- ------------------------------------------------------------------------------
Morgan (J.P.) Securities, Inc.
 6.06%(d)                                  05/01/00    271,000     271,000,000
- ------------------------------------------------------------------------------
Morgan Stanley Dean Witter & Co.
 6.04%(e)                                  03/01/00    237,000     237,000,000
- ------------------------------------------------------------------------------
  Total Master Note Agreements (Cost
   $865,000,000)                                                   865,000,000
- ------------------------------------------------------------------------------

MEDIUM TERM NOTES - 2.61%

American Telephone & Telegraph Corp.
 5.99%                                     07/13/00     25,000      24,996,339
- ------------------------------------------------------------------------------
Bears, Stearns & Co., Inc.
 6.13%(b)                                  11/14/00    122,200     122,200,000
- ------------------------------------------------------------------------------
Credit Suisse First Boston Corp.
 6.09%(b)                                  11/14/00     80,000      80,000,000
- ------------------------------------------------------------------------------
Morgan Stanley Dean Witter & Co.
 6.09%(b)                                  08/04/00    250,000     250,000,000
- ------------------------------------------------------------------------------
Toyota Motor Credit Corp.
 6.11%(b)                                  09/20/00     35,000      35,000,000
- ------------------------------------------------------------------------------
SMM Trust 1999-E
 6.02%(f)                                  04/05/00     10,750      10,750,000
- ------------------------------------------------------------------------------
  Total Medium Term Notes (Cost
   $522,946,339)                                                   522,946,339
- ------------------------------------------------------------------------------

PROMISSORY NOTES - 3.12%

Goldman Sachs Group, L.P.
 5.88%                                     03/24/00    300,000     300,000,000
- ------------------------------------------------------------------------------
 6.09%                                     05/16/00    125,000     125,000,000
- ------------------------------------------------------------------------------
 6.11%                                     05/24/00    200,000     200,000,000
- ------------------------------------------------------------------------------
  Total Promissory Notes (Cost
   $625,000,000)                                                   625,000,000
- ------------------------------------------------------------------------------

VARIABLE RATE DEMAND BONDS - 1.26%

B. Braun Medical Inc. RB (LOC-First Union
 National Bank)
 5.95%(g)                                  02/01/15     30,755      30,755,000
- ------------------------------------------------------------------------------
Belk, Inc. RB (LOC-First Union National
 Bank)
 5.95%(g)                                  07/01/08     63,200      63,200,000
- ------------------------------------------------------------------------------
BMC Special Care Facilities RB
 5.90%(g)(h)                               11/15/29     20,000      20,000,000
- ------------------------------------------------------------------------------
</TABLE>

                                       8
<PAGE>

<TABLE>
<CAPTION>
                                                          PAR
                                            MATURITY     (000)        VALUE
<S>                                         <C>      <C>        <C>
VARIABLE RATE DEMAND BONDS - (continued)

Borsis Finance, LLC RB (LOC-Wachovia Bank)
 5.88%(g)                                   09/01/19 $   20,000 $    20,000,000
- -------------------------------------------------------------------------------
Connecticut State Housing Financing
 Authority RB
 5.87%(g)(h)                                11/15/16     48,220      48,220,000
- -------------------------------------------------------------------------------
Gulf States Paper Corp. RB (LOC-Wachovia
 Bank)
 5.88%(g)                                   11/01/18     25,000      25,000,000
- -------------------------------------------------------------------------------
Southwestern Retirement Association Tax,
 Inc. RB (LOC-First Union National Bank)
 5.95%(g)                                   08/01/19     20,000      20,000,000
- -------------------------------------------------------------------------------
Texas (State of) GO Veteran's Housing
 Assistance Program
 5.85%(h)                                   12/01/29     25,000      25,000,000
- -------------------------------------------------------------------------------
  Total Variable Rate Demand Bonds (Cost
   $252,175,000)                                                    252,175,000
- -------------------------------------------------------------------------------

TIME DEPOSITS - 32.22%

Amsouth Bank of Birmingham AL-Cayman
 5.88%                                      03/01/00    267,000     267,000,000
- -------------------------------------------------------------------------------
Bank of America, NT & SA-Cayman
 5.81%                                      03/01/00    500,000     500,000,000
- -------------------------------------------------------------------------------
Banque Bruxelles Lambert-London
 5.94%                                      03/01/00    728,000     728,000,000
- -------------------------------------------------------------------------------
CIBC-Cayman
 5.81%                                      03/01/00    200,000     200,000,000
- -------------------------------------------------------------------------------
Credit Communal De Belgique-Cayman
 5.94%                                      03/01/00    128,000     128,000,000
- -------------------------------------------------------------------------------
Credit Suisse First Boston Corp.-Cayman
 5.88%                                      03/01/00    700,000     700,000,000
- -------------------------------------------------------------------------------
Den Danske Bank-Cayman
 5.91%                                      03/01/00    261,000     261,000,000
- -------------------------------------------------------------------------------
Deutsche Bank-Cayman
 5.94%                                      03/01/00     38,000      38,000,000
- -------------------------------------------------------------------------------
Dresdner Bank-Cayman
 5.81%                                      03/01/00    250,000     250,000,000
- -------------------------------------------------------------------------------
M&I Marshall & Isley Bank Milwaukee
 5.81%                                      03/01/00    200,000     200,000,000
- -------------------------------------------------------------------------------
Norwest Bank, Minnesota Cayman
 5.88%                                      03/01/00    250,000     250,000,000
- -------------------------------------------------------------------------------
Regions Bank-Cayman
 5.94%                                      03/01/00    728,000     728,000,000
- -------------------------------------------------------------------------------
Societe Generale-Cayman
 5.81%                                      03/01/00    635,788     635,788,481
- -------------------------------------------------------------------------------
Suntrust Bank Atlanta-Cayman
 5.88%                                      03/01/00    850,000     850,000,000
- -------------------------------------------------------------------------------
UBS AG-Cayman
 5.81%                                      03/01/00    500,000     500,000,000
- -------------------------------------------------------------------------------
Westdeutsche Landesbank-Cayman
 5.94%                                      03/01/00    228,000     228,000,000
- -------------------------------------------------------------------------------
  Total Time Deposits (Cost $6,463,788,481)                       6,463,788,481
- -------------------------------------------------------------------------------
</TABLE>

                                       9
<PAGE>

<TABLE>
<CAPTION>
                                                           PAR
                                             MATURITY     (000)         VALUE
<S>                                         <C>      <C>        <C>
REPURCHASE AGREEMENTS(i) - 21.37%

Bank of America Securities Inc.
 5.87%(j)                                   03/01/00 $   74,120 $    74,119,581
- --------------------------------------------------------------------------------
Bank One Capital Markets, Inc.
 5.87%(k)                                   03/01/00    373,000     373,000,000
- --------------------------------------------------------------------------------
Barclays Capital Inc.
 5.87%(l)                                   03/01/00    355,254     355,253,977
- --------------------------------------------------------------------------------
Bear, Stearns & Co., Inc.
 5.87%(m)                                         --    572,000     572,000,000
- --------------------------------------------------------------------------------
CIBC Oppenheimer Corp.
 5.87%(n)                                   03/01/00    100,000     100,000,000
- --------------------------------------------------------------------------------
Credit Suisse First Boston Corp.
 5.85%(o)                                   03/01/00     30,000      30,000,000
- --------------------------------------------------------------------------------
Deutsche Bank Securities, Inc.
 5.86%(p)                                         --    200,000     200,000,000
- --------------------------------------------------------------------------------
 5.86%(q)                                   03/01/00     71,233      71,232,687
- --------------------------------------------------------------------------------
First Union Capital Markets
 5.87%(r)                                   03/01/00    125,000     125,000,000
- --------------------------------------------------------------------------------
Goldman, Sachs & Co.
 5.87%(s)                                   03/01/00    450,000     450,000,000
- --------------------------------------------------------------------------------
Morgan Stanley Dean Witter & Co.
 5.85%(t)                                   03/01/00     72,198      72,197,905
- --------------------------------------------------------------------------------
Salomon Smith Barney, Inc.
 5.86%(u)                                         --    915,000     915,000,000
- --------------------------------------------------------------------------------
 5.76%(v)                                   03/01/00     51,807      51,807,034
- --------------------------------------------------------------------------------
Societe Generale Cowen Securities Corp.
 5.87%(w)                                   03/01/00    175,000     175,000,000
- --------------------------------------------------------------------------------
Warburg Dillon Read LLC
 5.87%(x)                                   03/01/00    373,000     373,000,000
- --------------------------------------------------------------------------------
 5.55%(y)                                   03/01/00     75,000      75,000,000
- --------------------------------------------------------------------------------
Westdeutsche Landesbank Girozentrale
 5.87%(z)                                   03/01/00    275,000     275,000,000
- --------------------------------------------------------------------------------
  Total Repurchase Agreements (Cost
   $4,287,611,184)                                                4,287,611,184
- --------------------------------------------------------------------------------
TOTAL INVESTMENTS (Cost $20,355,674,395) -
  101.46%                                                        20,355,674,395
- --------------------------------------------------------------------------------
OTHER LIABILITIES LESS ASSETS - (1.46)%                            (294,206,669)
- --------------------------------------------------------------------------------
NET ASSETS - 100.00%                                            $20,061,467,726
- --------------------------------------------------------------------------------
</TABLE>

Investment Abbreviations:
 GO -- General Obligation Bond
 RB -- Revenue Bond

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) Interest rates are redetermined daily. Rate shown is the rate in effect on
    02/29/00.

See Notes to Financial Statements.

                                       10
<PAGE>

(c) The Portfolio may demand prepayment of notes purchased under the Master
    Note Purchase Agreement upon one business days' notice. Interest rates on
    master notes are redetermined periodically. Rate shown is the rate in
    effect on 02/29/00.
(d) The Portfolio may demand prepayment of notes purchased under the Master
    Note Purchase Agreement upon seven business days' notice. Interest rates on
    master notes are redetermined periodically. Rate shown is the rate in
    effect on 02/29/00.
(e) Master Note Purchase Agreement may be terminated by either party upon three
    business days' prior written notice, at which time all amounts outstanding
    under the notes purchased under the Master Note Agreement will become
    payable. Interest rates on master notes are redetermined periodically. Rate
    shown is the rate in effect on 02/29/00.
(f) Interest rates are predetermined quarterly. Rate shown is the rate in
    effect on 02/29/00.
(g) Demand security; payable upon demand by the Fund with usually no more than
    seven calendar days' notice. Interest rates are redetermined periodically.
    Rate shown is in effect on 02/29/00.
(h) Secured by bond insurance provided by one of the following companies:
    AMBAC, FGIC, FSA, or MBIA.
(i) 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 is at least 102% of the
    sales price of the repurchase agreement. The investments in some repurchase
    agreements are through participation in joint accounts with other mutual
    funds, private accounts and certain non-registered investment companies
    managed by the investment advisor or its affiliates.
(j) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $800,130,444. Collateralized by $1,015,808,249 U.S. Government obligations,
    5.50% to 8.50% due 07/15/03 to 11/01/28 with an aggregate market value at
    02/29/00 of $816,000,001.
(k) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $500,081,528. Collateralized by $515,023,000 U.S. Government obligations,
    0% to 8.00% due 03/01/00 to 08/25/14 with an aggregate market value at
    02/29/00 of $510,003,862.
(l) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $396,637,718. Collateralized by $419,860,000 U.S. Government obligations,
    0% to 6.25% due 04/13/00 to 05/15/29 with an aggregate market value at
    02/29/00 of $404,505,314.
(m) Open repurchase agreement entered into 09/29/98; however, either party may
    terminate the agreement upon demand. Interest rates, par and collateral are
    redetermined daily. Collateralized by $936,354,126 U.S. Government
    obligations, 0% to 9.50% due 03/01/00 to 05/01/33 with an aggregate market
    value at 02/29/00 of $629,015,201.
(n) Repurchase agreement entered into 02/29/00 with a maturing value of
    $100,016,306. Collateralized by $266,306,141 U.S. Government obligations,
    6.007% to 7.50% due 12/01/00 to 12/01/25 with an aggregate market value at
    02/29/00 of $102,000,000.
(o) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $100,016,250. Collateralized by $107,780,000 U.S. Government obligations,
    5.33% to 6.80% due 01/10/03 to 08/15/04 with an aggregate market value at
    02/29/00 of $108,353,715.
(p) Open repurchase agreement entered into 10/02/97; however, either party may
    terminate the agreement upon demand. Interest rates, par and collateral are
    redetermined daily. Collateralized by $241,953,163 U.S. Government
    obligations, 5.50% to 6.50% due 02/01/06 to 01/01/29 with an aggregate
    market value at 02/29/00 of $204,000,000.
(q) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $100,016,278. Collateralized by $101,295,000 U.S. Government obligation,
    6.35% due 01/05/01 with a market value at 02/29/00 of $102,005,599.
(r) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $150,024,375. Collateralized by $164,246,000 U.S. Government obligations,
    0% to 8.25% due 03/01/00 to 06/15/44 with an aggregate market value at
    02/29/00 of $153,000,487.
(s) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $750,122,292. Collateralized by $1,294,709,963 U.S. Government obligations,
    5.00% to 8.00% due 02/01/14 to 10/01/38 with an aggregate market value at
    02/29/00 of $765,000,000.
(t) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $150,024,458. Collateralized by $156,510,000 U.S. Government obligations,
    0% to 7.42% due 07/06/00 to 12/27/17 with an aggregate market value at
    02/29/00 of $153,002,600.
(u) Open repurchase agreement entered into 12/25/97; however, either party may
    terminate the agreement upon demand. Interest rates, par and collateral are
    redetermined daily. Collateralized by $2,307,348,000 U.S. Government
    obligations, 0% to 10.70% due 03/17/00 to 07/15/43 with an aggregate market
    value at 02/29/00 of $933,426,390.
(v) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $500,080,000. Collateralized by $1,248,055,000 U.S. Government obligations,
    0% due 11/15/01 to 08/15/21 with an aggregate market value at 02/29/00 of
    $510,176,897.
(w) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $200,032,611. Collateralized by $206,650,000 U.S. Government obligations,
    0% to 6.875% due 06/01/00 to 01/15/05 with an aggregate market value at
    02/29/00 of $204,474,729.
(x) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $500,081,528. Collateralized by $643,496,000 U.S. Government obligations,
    0% to 9.375% due 03/07/00 to 01/15/30 with an aggregate market value at
    02/29/00 of $510,001,318.
(y) Repurchase agreement entered into 02/29/00 with a maturing value of
    $75,011,562. Collateralized by $80,392,000 U.S. Government obligations,
    5.50% to 6.00% due 02/15/26 to 08/15/28 with an aggregate market value at
    02/29/00 of $76,502,280.
(z) Joint repurchase agreement entered into 02/29/00 with a maturing value of
    $300,048,917. Collateralized by $331,666,013 U.S. Government obligations,
    0% to 6.568% due 03/15/00 to 09/01/28 with an aggregate market value at
    02/29/00 of $306,000,811.

See Notes to Financial Statements.

                                       11
<PAGE>

STATEMENT OF ASSETS AND LIABILITIES
February 29, 2000
(Unaudited)

<TABLE>
<S>                                                       <C>
ASSETS:

Investments, excluding repurchase agreements, at value
 (amortized cost)                                         $16,068,063,211
- -------------------------------------------------------------------------
Repurchase agreements                                       4,287,611,184
- -------------------------------------------------------------------------
Cash                                                            1,100,433
- -------------------------------------------------------------------------
Interest receivable                                            36,744,192
- -------------------------------------------------------------------------
Investment for deferred compensation plan                          87,434
- -------------------------------------------------------------------------
Other assets                                                      479,543
- -------------------------------------------------------------------------
  Total assets                                             20,394,085,997
- -------------------------------------------------------------------------

LIABILITIES:

Payables for:
 Investments purchased                                        248,642,836
- -------------------------------------------------------------------------
 Dividends                                                     81,477,022
- -------------------------------------------------------------------------
 Deferred compensation                                             87,434
- -------------------------------------------------------------------------
Accrued administrative services fees                               58,500
- -------------------------------------------------------------------------
Accrued advisory fees                                             803,454
- -------------------------------------------------------------------------
Accrued distribution fees                                         424,424
- -------------------------------------------------------------------------
Accrued transfer agent fees                                       511,660
- -------------------------------------------------------------------------
Accrued operating expenses                                        612,941
- -------------------------------------------------------------------------
  Total liabilities                                           332,618,271
- -------------------------------------------------------------------------
NET ASSETS                                                $20,061,467,726
=========================================================================

NET ASSETS:

Institutional Class                                       $15,639,959,687
=========================================================================
Private Investment Class                                  $   472,345,727
=========================================================================
Personal Investment Class                                 $     5,276,254
=========================================================================
Cash Management Class                                     $ 2,708,766,732
=========================================================================
Reserve Class                                             $       108,325
=========================================================================
Resource Class                                            $ 1,235,011,001
=========================================================================

CAPITAL STOCK, $.001 PAR VALUE PER SHARE:

Institutional Class                                        15,639,865,923
=========================================================================
Private Investment Class                                      472,344,416
=========================================================================
Personal Investment Class                                       5,276,240
=========================================================================
Cash Management Class                                       2,708,727,411
=========================================================================
Reserve Class                                                     108,323
=========================================================================
Resource Class                                              1,235,021,505
=========================================================================

NET ASSET VALUE PER SHARE:

Net asset value, offering and redemption price per share            $1.00
=========================================================================
</TABLE>

See Notes to Financial Statements.

                                       12
<PAGE>

STATEMENT OF OPERATIONS
For the six months ended February 29, 2000
(Unaudited)

<TABLE>
<S>                                                   <C>
INVESTMENT INCOME:

Interest income                                       $428,441,851
- -------------------------------------------------------------------

EXPENSES:

Advisory
 fees                                                   11,253,406
- -------------------------------------------------------------------
Custodian fees                                             529,540
- -------------------------------------------------------------------
Administrative services fees                               307,096
- -------------------------------------------------------------------
Distribution fees (see Note 2)                           2,554,713
- -------------------------------------------------------------------
Directors' fees                                             27,871
- -------------------------------------------------------------------
Transfer agent fees                                      1,488,703
- -------------------------------------------------------------------
Other                                                      372,433
- -------------------------------------------------------------------
  Total expenses                                        16,533,762
- -------------------------------------------------------------------
Less: Fee waivers                                       (7,766,586)
- -------------------------------------------------------------------
  Net expenses                                           8,767,176
- -------------------------------------------------------------------
Net investment income                                  419,674,675
- -------------------------------------------------------------------
Net realized gain on sales of investments                   81,121
- -------------------------------------------------------------------
Net increase in net assets resulting from operations  $419,755,796
===================================================================
</TABLE>

See Notes to Financial Statements.

                                       13
<PAGE>

STATEMENT OF CHANGES IN NET ASSETS
For the six months ended February 29, 2000 and year ended August 31, 1999
(Unaudited)

<TABLE>
<CAPTION>
                                               FEBRUARY 29,      AUGUST 31,
                                                   2000             1999
                                              ---------------  --------------
<S>                                           <C>              <C>
OPERATIONS:

 Net investment income                        $   419,674,675  $  326,765,434
- ------------------------------------------------------------------------------
 Net realized gain on sales of investments             81,121         672,252
- ------------------------------------------------------------------------------
  Net increase in net assets resulting from
   operations                                     419,755,796     327,437,686
- ------------------------------------------------------------------------------
Distributions to shareholders from net
 investment income:
  Institutional Class                            (334,966,991)   (264,791,600)
- ------------------------------------------------------------------------------
  Private Investment Class                        (10,757,826)     (9,376,339)
- ------------------------------------------------------------------------------
  Personal Class                                      (69,591)         (3,765)
- ------------------------------------------------------------------------------
  Cash Management Class                           (63,636,189)    (46,551,990)
- ------------------------------------------------------------------------------
  Reserve Class                                          (769)             --
- ------------------------------------------------------------------------------
  Resource Class                                  (10,243,309)     (6,041,740)
- ------------------------------------------------------------------------------
Capital stock transactions -- net (see Note
 4)                                            13,866,891,254   2,284,209,435
- ------------------------------------------------------------------------------
  Net increase in net assets                   13,866,972,375   2,284,881,687
- ------------------------------------------------------------------------------

NET ASSETS:

  Beginning of period                           6,194,495,351   3,909,613,664
- ------------------------------------------------------------------------------
  End of period                               $20,061,467,726  $6,194,495,351
==============================================================================

NET ASSETS CONSIST OF:

  Capital (par value and additional paid-in)  $20,061,343,818  $6,194,452,564
- ------------------------------------------------------------------------------
  Undistributed net realized gain on sales of
   investment securities                              123,908          42,787
- ------------------------------------------------------------------------------
                                              $20,061,467,726  $6,194,495,351
==============================================================================
</TABLE>

See Notes to Financial Statements.

                                       14
<PAGE>

NOTES TO FINANCIAL STATEMENTS
February 29, 2000
(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, each of which offers separate series of shares:
the Prime Portfolio and the Liquid Assets Portfolio. Information presented in
these financial statements pertains only to the Liquid Assets Portfolio (the
"Portfolio") with the assets, liabilities and operations of each portfolio
accounted for separately. The Portfolio currently offers six different classes
of shares: the Institutional Class, the Cash Management Class, the Private
Investment Class, the Personal Investment Class, the Reserve Class and the
Resource Class. Sales of the Reserve Class commenced on January 14, 2000.
Matters affecting each class are voted on exclusively by the shareholders of
each class. The Portfolio is a money market fund whose objective is the
maximization of current income to the extent consistent with the preservation
of capital and the maintenance of liquidity.
 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. The
following is a summary of significant accounting policies followed by the
Portfolio in the preparation of its financial statements.
A. Security Valuations - The Portfolio's 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 - Distribution expenses directly attributable to a class of shares
    are charged to that class' operations. All other expenses which are
    attributable to more than one class are allocated among the classes.

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 investment advisory
agreement, AIM receives a monthly fee with respect to the Portfolio at the
annual rate of 0.15% of the average daily net assets of the Portfolio. During
the six months ended February 29, 2000, AIM waived fees of $7,127,157.
 The Fund, pursuant to a master administrative services agreement with AIM, has
agreed to pay AIM for certain administrative costs incurred in providing
accounting services to the Fund. During the six months ended February 29, 2000,
AIM was paid $307,096 for such services.
 The Fund, pursuant to a transfer agency and service agreement, has agreed to
pay A I M Fund Services, Inc. ("AFS") a fee for providing transfer agent and
shareholder services to the Fund. During the six months ended February 29,
2000, AFS was paid $1,389,867 for such services.

                                       15
<PAGE>

 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, the
Reserve Class, and the Resource Class of the Portfolio. The Plan provides that
the Private Investment Class, the Personal Investment Class, the Cash
Management Class, the Reserve Class, and the Resource Class pay up to a 0.50%,
0.75%, 0.10%, 1.00%, 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, the Personal Investment Class, and the Reserve 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, the Reserve Class, or the Resource Class. Any amounts not paid as a
service fee under such Plan would constitute an asset-based sales charge. The
Plan also imposes a cap on the total amount of sales charges, including asset-
based sales charges, that may be paid by the Portfolio with respect to each
class. Currently, FMC has elected to waive a portion of its compensation
payable by the Fund such that the compensation paid pursuant to the Plan with
respect to the Private Investment Class, the Personal Investment Class, the
Cash Management Class, the Reserve Class, and the Resource Class equals 0.30%,
0.50%, 0.08%, 0.80% and 0.16%, respectively, maximum annual rate of the average
daily net assets attributable to such class. During the six months ended
February 29, 2000, the Private Investment Class, the Personal Investment Class,
the Cash Management Class, the Resource Class and the Reserve Class paid
$608,710, $6,756, $920,852, $378,842, and $124, respectively, as compensation
under the Plan. FMC waived fees of $639,429 for the same period.
 Certain officers and directors of the Fund are officers of AIM, FMC and AFS.
 During the six months ended February 29, 2000, the Fund paid legal fees of
$6,075 for services rendered by Kramer, Levin, Naftalis & Frankel LLP as
counsel to the Board of Directors. A member of that firm is a director of the
Fund.

NOTE 3 - DIRECTORS' FEES

Directors' fees represent remuneration paid to directors who are not an
"interested person" of AIM. The Fund may invest directors' fees, if so elected
by a director, in mutual fund shares in accordance with a deferred compensation
plan.

                                       16
<PAGE>

NOTE 4 - SHARE INFORMATION

Changes in shares outstanding during the six months ended February 29, 2000 and
the year ended August 31, 1999 were as follows:

<TABLE>
<CAPTION>
                                       FEBRUARY 29, 2000                     AUGUST 31, 1999
                              ------------------------------------  -----------------------------------
                                   SHARES             AMOUNT             SHARES            AMOUNT
                              -----------------  -----------------  ----------------  -----------------
<S>                           <C>                <C>                <C>               <C>
Sold:
  Institutional Class           135,476,446,930  $ 135,476,446,930   153,902,899,999  $ 153,902,899,999
- --------------------------------------------------------------------------------------------------------
  Private Investment Class        3,327,798,666      3,327,798,666     4,203,510,271      4,203,510,271
- --------------------------------------------------------------------------------------------------------
  Personal Investment Class*          8,517,511          8,517,511         1,117,987          1,117,987
- --------------------------------------------------------------------------------------------------------
  Cash Management Class          18,854,015,231     18,854,015,231    14,321,528,231     14,321,528,231
- --------------------------------------------------------------------------------------------------------
  Resource Class                  3,002,971,959      3,002,971,959     2,669,302,439      2,669,302,439
- --------------------------------------------------------------------------------------------------------
  Reserve Class**                       484,000            484,000                --                 --
- --------------------------------------------------------------------------------------------------------
Issued as reinvestment of
 dividends:
  Institutional Class                45,116,569         45,116,569        32,251,894         32,251,894
- --------------------------------------------------------------------------------------------------------
  Private Investment Class            2,984,166          2,984,166         3,157,926          3,157,926
- --------------------------------------------------------------------------------------------------------
  Personal Investment Class*             37,965             37,965               255                255
- --------------------------------------------------------------------------------------------------------
  Cash Management Class              36,668,929         36,668,929        34,021,495         34,021,495
- --------------------------------------------------------------------------------------------------------
  Resource Class                      8,517,751          8,517,751         5,318,298          5,318,298
- --------------------------------------------------------------------------------------------------------
  Reserve Class**                           324                324                --                 --
- --------------------------------------------------------------------------------------------------------
Reacquired:
  Institutional Class          (124,423,602,077)  (124,423,602,077) (152,491,320,126)  (152,491,320,126)
- --------------------------------------------------------------------------------------------------------
  Private Investment Class       (3,124,470,758)    (3,124,470,758)   (4,010,706,089)    (4,010,706,089)
- --------------------------------------------------------------------------------------------------------
  Personal Investment Class*         (4,273,228)        (4,273,228)         (124,251)          (124,251)
- --------------------------------------------------------------------------------------------------------
  Cash Management Class         (17,260,708,640)   (17,260,708,640)  (13,932,834,793)   (13,932,834,793)
- --------------------------------------------------------------------------------------------------------
  Resource Class                 (2,083,238,044)    (2,083,238,044)   (2,453,914,101)    (2,453,914,101)
- --------------------------------------------------------------------------------------------------------
  Reserve Class**                      (376,000)          (376,000)               --                 --
- --------------------------------------------------------------------------------------------------------
Net increase                     13,866,891,254  $  13,866,891,254     2,284,209,435  $   2,284,209,435
- --------------------------------------------------------------------------------------------------------
</TABLE>
  * The Personal Investment Class commenced sales on June 22, 1999.
 ** The Reserve Class commenced sales on January 14, 2000.

                                       17
<PAGE>

NOTE 5 - FINANCIAL HIGHLIGHTS

Shown below are the financial highlights for a share of the Reserve Class
capital stock outstanding during the period January 14, 2000 (date sales
commenced) through February 29, 2000.

<TABLE>
<CAPTION>
                                                      FEBRUARY 29,
                                                          2000
                                                      ------------
<S>                                                   <C>
Net asset value, beginning of period                     $ 1.00
- ----------------------------------------------------     ------
Income from investment operations:
 Net investment income                                     0.01
- ----------------------------------------------------     ------
Less distributions:
 Dividends from net investment income                     (0.01)
- ----------------------------------------------------     ------
Net asset value, end of period                           $ 1.00
====================================================     ======
Total return(a)                                            0.64%
====================================================     ======
Ratios/supplemental data:
Net assets, end of period (000s omitted)                 $  108
====================================================     ======
Ratio of expenses to average net assets:
 Including fee waivers and/or expense reimbursements       0.89%(b)
====================================================     ======
 Excluding fee waivers and/or expense reimbursements       1.18%(b)
====================================================     ======
Ratio of net investment income to average net assets       4.81%(b)
====================================================     ======
</TABLE>
(a) Not annualized for periods less than one year.
(b) Ratios are annualized and based on average net assets of $120,265.

                                       18
<PAGE>

<TABLE>
<CAPTION>
                           DIRECTORS
<S>                                                                        <C>
Charles T. Bauer                                  Carl Frischling
Bruce L. Crockett                                Robert H. Graham          Short-Term
Owen Daly II                                   Prema Mathai-Davis          Investments Co.
Edward K. Dunn, Jr.                              Lewis F. Pennock          (STIC)
Jack M. Fields                                     Louis S. Sklar

                           OFFICERS

Charles T. Bauer                                         Chairman
Robert H. Graham                                        President
Gary T. Crum                                   Sr. Vice President
Carol F. Relihan                   Sr. Vice President & Secretary
Dana R. Sutton                         Vice President & Treasurer
Melville B. Cox                                    Vice President          Liquid Assets
Karen Dunn Kelley                                  Vice President          Portfolio
J. Abbott Sprague                                  Vice President          -------------------------------------------------
Mary J. Benson     Assistant Vice President & Assistant Treasurer          Reserve                                     SEMI-
Sheri Morris       Assistant Vice President & Assistant Treasurer          Class                                      ANNUAL
Renee A. Friedli                              Assistant Secretary                                                     REPORT
P. Michelle Grace                             Assistant Secretary
Nancy L. Martin                               Assistant Secretary                                          FEBRUARY 29, 2000
Ofelia M. Mayo                                Assistant Secretary
Lisa A. Moss                                  Assistant Secretary
Kathleen J. Pflueger                          Assistant Secretary
Samuel D. Sirko                               Assistant Secretary
Stephen I. Winer                              Assistant Secretary

                        INVESTMENT ADVISOR
                       A I M Advisors, Inc.
                   11 Greenway Plaza, Suite 100
                      Houston, TX 77046-1173
                           800-347-1919

                           DISTRIBUTOR
                    Fund Management Company
                 11 Greenway Plaza, Suite 100
                     Houston, TX 77046-1173
                         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, LLP
                1735 Market Street, 51st Floor
                 Philadelphia, PA 19103-7599

                  LEGAL COUNSEL TO DIRECTORS
             Kramer Levin Naftalis & Frankel LLP
                      919 Third Avenue
                     New York, NY 10022

                      TRANSFER AGENT
                 A I M Fund Services, Inc.
                11 Greenway Plaza, Suite 100
                   Houston, TX 77046-1173






This report may be distributed only to current shareholders or                         [LOGO APPEARS HERE]
      to persons who have received a current prospectus.                             Fund Management Company
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LAP-AR-3



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