SHORT TERM INVESTMENTS TRUST
PRES14A, 2000-02-08
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<PAGE>   1
                                  SCHEDULE 14A
                                 (RULE 14a-101)

                    INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION

          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                    EXCHANGE ACT OF 1934 (AMENDMENT NO.   )

Filed by the Registrant [X]

Filed by a Party other than the Registrant [ ]

Check the appropriate box:

<TABLE>
<S>                                       <C>
[X]  Preliminary Proxy Statement          [ ]  Confidential, for Use of the
                                               Commission Only (as permitted by
                                               Rule 14a-6(e)(2))
[ ]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[ ]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12
</TABLE>

                          SHORT-TERM INVESTMENTS TRUST
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified in Its Charter)

- --------------------------------------------------------------------------------
   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

   [X]  No fee required.

   [ ]  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

   (1)  Title of each class of securities to which transaction applies:

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

   (2)  Aggregate number of securities to which transaction applies:

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

   (3)  Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
        filing fee is calculated and state how it was determined):

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

   (4)  Proposed maximum aggregate value of transaction:

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

   (5)  Total fee paid:

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

   [ ]  Fee paid previously with preliminary materials.

   [ ]  Check box if any part of the fee is offset as provided by Exchange Act
   Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
   paid previously. Identify the previous filing by registration statement
   number, or the form or Schedule and the date of its filing.

   (1)  Amount Previously Paid:

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

   (2)  Form, Schedule or Registration Statement No.:

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

   (3)  Filing Party:

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

   (4)  Date Filed:

        -----------------------------------------------------------------------
<PAGE>   2

                          SHORT-TERM INVESTMENTS TRUST

                         GOVERNMENT & AGENCY PORTFOLIO
                               TREASURY PORTFOLIO
                        TREASURY TAXADVANTAGE PORTFOLIO

            11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173


                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON MAY 3, 2000

TO THE SHAREHOLDERS:

     Short-Term Investments Trust (the trust) is holding a special meeting of
shareholders on Wednesday, May 3, 2000 at 3:00 p.m., Central time. The place of
the meeting is the trusts's offices at 11 Greenway Plaza, Suite 100, Houston,
Texas 77046-1173.

     The trust, a Delaware business trust, consists of the following series
portfolios: Government & Agency Portfolio, Treasury Portfolio and Treasury
TaxAdvantage Portfolio. This proxy statement relates to all of these series
portfolios (together, the funds).

     The purposes of the meeting are as follows:

(1)  To elect ten trustees, each of whom will serve until his or her successor
     is elected and qualified.

(2)  To approve a new Master Investment Advisory Agreement with A I M Advisors,
     Inc.

(3)  To approve changing the fundamental investment restrictions for all funds.

(4)  To approve changing the investment objectives of all funds so that they are
     non-fundamental.

(5)  To ratify the selection of KPMG LLP as independent accountants for each of
     the funds for the fiscal year ending in 2000.

(6)  To transact such other business as may properly come before the meeting.

     You may vote at the meeting if you are the record owner of shares of the
funds as of the close of business on February 18, 2000. If you attend the
meeting, you may vote your shares in person. If you expect to attend the meeting
in person, please notify the trust by calling 1-800-952-3502. If you do not
expect to attend the meeting, please fill in, date, sign and return the proxy
card in the enclosed envelope which requires no postage if mailed in the United
States.
<PAGE>   3

     It is important that you return your signed proxy card promptly so that a
quorum may be assured. If we do not hear from you after a reasonable amount of
time, you may receive a telephone call from our proxy solicitor, Shareholder
Communications Corporation, reminding you to vote your shares.

     Thank you for your cooperation and continued support.

                                                   By order of the Board,

                                                   Carol F. Relihan
                                                   Secretary

March 9, 2000

                                        2
<PAGE>   4

                          SHORT-TERM INVESTMENTS TRUST

                         GOVERNMENT & AGENCY PORTFOLIO
                               TREASURY PORTFOLIO
                        TREASURY TAXADVANTAGE PORTFOLIO

            11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173
                          [Toll Free: (800) 454-0327]

- --------------------------------------------------------------------------------
                                PROXY STATEMENT
                              DATED MARCH 9, 2000

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

                        SPECIAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON MAY 3, 2000

WHO IS ASKING FOR MY VOTE?

     The Board of Trustees (the Board) of Short-Term Investments Trust (the
trust) is sending you this proxy statement and the enclosed proxy card (or
cards) on behalf of the three portfolios of the trust listed above (together,
the funds). The Board is soliciting your proxy to vote at the 2000 special
meeting of shareholders of the trust (the meeting).

WHEN AND WHERE WILL THE MEETING BE HELD?

     The meeting will be held at the trust's offices, 11 Greenway Plaza, Suite
100, Houston, Texas 77046-1173, at 3:00 p.m., Central time, on Wednesday, May 3,
2000. If you expect to attend the meeting in person, please notify the trust by
calling 1-800-952-3502.

WHO IS ELIGIBLE TO VOTE?

     The Board is sending this proxy statement, the attached notice of meeting
and the enclosed proxy card on or about March 9, 2000 to all shareholders
entitled to vote. Shareholders who owned shares of beneficial interest of any
class of a fund at the close of business on February 18, 2000 (the record date)
are entitled to vote. The number of shares outstanding on the record date for
each class of each fund are set forth in Appendix A. Each share of beneficial
interest of a fund that you own entitles you to one vote on each proposal set
forth in this proxy statement (a fractional share has a fractional vote).

WHAT ARE THE DIFFERENT WAYS I CAN VOTE?

  Voting by Proxy

     Whether you plan to attend the meeting or not, the Board urges you to
complete, sign and date the enclosed proxy card and to return it promptly in the

                                        1
<PAGE>   5

envelope provided. Returning the proxy card will not affect your right to attend
the meeting and vote.

     The Board has named Robert H. Graham and Gary T. Crum as proxies. If you
properly fill in your proxy card and send it to the trust in time to vote, your
proxy will vote your shares as you have directed. If you sign the proxy card but
do not make specific choices, your proxy will vote your shares with respect to
Proposals 1 through 5 as recommended by the Board.

     If any other matter is presented, your proxy will vote in accordance with
his or her best judgment. At the time this proxy statement was printed, the
Board knew of no matters that needed to be acted on at the meeting other than
those discussed in this proxy statement.

     If you appoint a proxy, you may revoke it at any time before it is
exercised. You can do this by sending in another proxy with a later date or by
notifying the trust's secretary in writing before the meeting that you have
revoked your proxy.

  Voting in Person

     If you do attend the meeting and wish to vote in person, you will be given
a ballot when you arrive. However, if your shares are held in the name of your
broker, bank or other nominee, you must bring a letter from the nominee
indicating that you are the beneficial owner of the shares on the record date
and authorizing you to vote.

  Voting by Telephone

     You may vote by telephone if you are contacted by Shareholder
Communications Corporation.

HOW DOES THE BOARD RECOMMEND THAT I VOTE?

     The Board recommends that shareholders vote as follows:

     - FOR electing all ten nominees for director.

     - FOR approving a new advisory agreement.

     - FOR changing the funds' fundamental investment restrictions.

     - FOR changing the investment objectives of the funds so that they are
       non-fundamental.

     - FOR ratifying the Board's selection of independent accountants.

WHAT IS THE QUORUM REQUIREMENT?

     A quorum of shareholders is necessary to hold a valid meeting. The presence
in person or by proxy of shareholders entitled to cast one third of all votes
entitled to be cast at the meeting shall constitute a quorum at all meetings of
the
                                        2
<PAGE>   6

shareholders, except with respect to any matter which by law or the Agreement
and Declaration of Trust of the trust requires the separate approval of one or
more classes or series of the shares of beneficial interest of the trust, in
which case the holders of one-third of the shares of each such class or series
(or of such classes or series voting together as a single class) entitled to
vote on the matter shall constitute a quorum.

     Under rules applicable to broker-dealers, if your broker holds your shares
in its name, the broker will be entitled to vote your shares on Proposals 1 and
5 (election of trustees and ratification of selection of accountants) even if it
has not received instructions from you. Your broker will not be entitled to vote
on Proposals 2, 3, 4 or 6 (approving a new advisory agreement for your fund,
changing your fund's investment restrictions, making your fund's investment
objective non-fundamental and considering other matters) unless it has received
instructions from you. If your broker does not vote your shares on Proposals 2,
3, 4 or 6 because it has not received instructions from you, these shares will
be considered broker non-votes.

     Broker non-votes and abstentions with respect to any proposal will count as
present for establishing a quorum.

WHAT IS THE VOTE NECESSARY TO APPROVE EACH PROPOSAL?

     - The affirmative vote of a plurality of votes cast is necessary to elect
       the trustees, meaning that the nominees receiving the most votes will be
       elected (Proposal 1). In an uncontested election of trustees, the
       plurality requirement is not a factor.

     The affirmative vote of a majority of the outstanding voting securities of
each fund, as defined in the Investment Company Act of 1940, as amended (the
1940 Act), is required to:

     - approve the funds' new advisory agreement (Proposal 2);

     - approve new fundamental investment restrictions for the funds (Proposal
       3); and

     - make the investment objective of each fund non-fundamental (Proposal 4).

     The 1940 Act defines a majority of the outstanding voting securities of a
fund (a 1940 Act majority) as the lesser of (a) the vote of holders of 67% or
more of the voting securities of the fund present in person or by proxy, if the
holders of more than 50% of the outstanding voting securities of the fund are
present in person or by proxy, or (b) the vote of the holders of more than 50%
of the outstanding voting securities of the fund. Broker non-votes and
abstentions will not count as votes cast and will have the effect of votes
against Proposals 2 through 4.
                                        3
<PAGE>   7

     The affirmative vote of a majority of votes cast is necessary to ratify the
selection of KPMG LLP as your fund's independent accountants (Proposal 5). For
Proposal 5, abstentions will not count as votes cast and will have no effect on
the outcome of the vote.

CAN THE MEETING BE ADJOURNED?

     The proxies may propose to adjourn the meeting to permit further
solicitation of proxies or for other purposes. Any such adjournment will require
the affirmative vote of a majority of the votes cast.

HOW CAN I OBTAIN MORE INFORMATION ABOUT THE FUNDS?

     UPON YOUR REQUEST, EACH FUND WILL FURNISH YOU A FREE COPY OF ITS MOST
RECENT ANNUAL REPORT. YOU SHOULD DIRECT YOUR REQUEST TO A I M FUND SERVICES,
INC. AT P.O. BOX 4497, HOUSTON, TX 77210-4497 OR BY CALLING 1-800-347-4246.

                       PROPOSAL 1:  ELECTION OF TRUSTEES

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THE ELECTION OF TRUSTEES?

     Proposal 1 applies to all shareholders of all funds.

WHO ARE THE NOMINEES FOR TRUSTEE?

     For election of trustees at the meeting, the Board has approved the
nomination of Charles T. Bauer, Bruce L. Crockett, Owen Daly II, Edward K. Dunn,
Jr., Jack M. Fields, Carl Frischling, Robert H. Graham, Prema Mathai-Davis,
Lewis F. Pennock and Louis S. Sklar, each to serve as trustee until his or her
successor is elected and qualified.

     The proxies will vote for the election of these nominees unless you
withhold authority to vote for any or all of them in the proxy. Each of the
nominees has indicated that he or she is willing to serve as a trustee. If any
or all of the nominees should become unavailable for election due to events not
now known or anticipated, the persons named as proxies will vote for such other
nominee or nominees as the trustees who are not interested persons of the trust,
as defined in the 1940 Act (the independent trustees), may recommend.

     All of the nominees presently are trustees of the trust. The nominees also
serve as directors, trustees or officers of the following open-end management
investment companies advised or managed by A I M Advisors, Inc. (AIM): AIM
Advisor Funds, Inc., AIM Equity Funds, Inc., AIM Funds Group, AIM International
Funds, Inc., AIM Investment Securities Funds, AIM Special Opportunities Funds,
AIM Summit Fund, Inc., AIM Tax Exempt Funds, Inc., AIM Variable Insurance Funds,
Inc., Short-Term Investments Co., Short-Term Investments Trust and Tax-Free
Investments Co. (these investment companies

                                        4
<PAGE>   8

and their series portfolios, if any, are referred to collectively as the AIM
funds). Robert H. Graham also serves as a director or trustee and officer of
other open-end and closed-end management investment companies managed or advised
by AIM. No trustee or nominee is a party adverse to the trust or any of its
affiliates in any material pending legal proceedings, nor does any trustee or
nominee have an interest materially adverse to the trust.

     The following table sets forth information concerning the nominees:

<TABLE>
<CAPTION>
NAME, ADDRESS AND AGE          TRUSTEE SINCE     PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------          --------------    ----------------------------------------
<S>                            <C>               <C>
+*Charles T. Bauer (81)        May 5, 1993       Director and Chairman, A I M Management
11 Greenway Plaza                                Group Inc.; A I M Advisors, Inc., A I M
Suite 100                                        Capital Management, Inc.; A I M
Houston, TX 77046-1173                           Distributors, Inc.; A I M Fund Services,
                                                 Inc. and Fund Management Company; and
                                                 Executive Vice Chairman and Director,
                                                 AMVESCAP PLC.

Bruce L. Crockett (55)         May 5, 1993       Director, ACE Limited (insurance
906 Frome Lane                                   company). Formerly, Director, President
McLean, VA 22102                                 and Chief Executive Officer, COMSAT
                                                 Corporation; and Chairman, Board of
                                                 Governors of INTELSAT (international
                                                 communications company).

+Owen Daly II (75)             May 5, 1993       Formerly, Director, Cortland Trust Inc.
Six Blythewood Road                              (investment company), CF & I Steel
Baltimore, MD 21210                              Corp., Monumental Life Insurance Company
                                                 and Monumental General Insurance
                                                 Company; and Chairman of the Board of
                                                 Equitable Bancorporation.

Edward K. Dunn, Jr. (64)       March 10, 1998    Chairman of the Board of Directors,
2 Hopkins Plaza, 8th Floor                       Mercantile Mortgage Corporation.
Suite 805                                        Formerly, Vice Chairman of the Board of
Baltimore, MD 21201                              Directors and President and Chief
                                                 Operating Officer, Mercantile-Safe
                                                 Deposit & Trust Co.; and President,
                                                 Mercantile Bankshares.
</TABLE>

+ Does not include years of service as a trustee or director of any predecessor
  funds.

*  Mr. Bauer is an interested person of AIM and the trust, as defined in the
   1940 Act, primarily because of his positions with AIM and its affiliated
   companies, as set forth above, and through his ownership of stock of AMVESCAP
   PLC, which, through A I M Management Group Inc., owns all of the outstanding
   stock of AIM.

                                        5
<PAGE>   9

<TABLE>
<CAPTION>
NAME, ADDRESS AND AGE        TRUSTEE SINCE      PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------      ------------------   ----------------------------------------
<S>                        <C>                  <C>
Jack M. Fields (48)        March 11, 1997       Chief Executive Officer, Texana Global,
Jetero Plaza, Suite E                           Inc. (foreign trading company) and
8810 Will Clayton Parkway                       Twenty First Century Group, Inc. (a
Humble, TX 77338                                governmental affairs company); and
                                                Director, Telscape International and
                                                Administaff. Formerly, Member of the
                                                U.S. House of Representatives.

+**Carl Frischling (63)    May 5, 1993          Partner, Kramer Levin Naftalis & Frankel
919 Third Avenue                                LLP (law firm). Formerly Partner, Reid &
New York, NY 10022                              Priest (law firm).

+***Robert H. Graham (53)  May 10, 1994         Director, President and Chief Executive
11 Greenway Plaza Suite                         Officer, A I M Management Group Inc.;
100                                             Director and President, A I M Advisors,
Houston, TX 77046-1173                          Inc.; Director and Senior Vice
                                                President, A I M Capital Management,
                                                Inc., A I M Distributors, Inc., A I M
                                                Fund Services, Inc. and Fund Management
                                                Company; and Director and Chief
                                                Executive Officer, Managed Products,
                                                AMVESCAP PLC.

Prema Mathai-Davis (49)    September 10, 1998   Chief Executive Officer, YWCA of the
350 Fifth Avenue, Suite                         U.S.A.
301
New York, NY 10118

+Lewis F. Pennock (57)     May 5, 1993          Partner, Pennock & Cooper (law firm).
6363 Woodway, Suite 825
Houston, TX 77057

+Louis S. Sklar (60)       May 5, 1993          Executive Vice President, Development
The Williams Tower                              and Operations, Hines Interests Limited
50th Floor                                      Partnership (real estate development).
2800 Post Oak Boulevard
Houston, TX 77056
</TABLE>

+  Does not include years of service as a trustee or director of any predecessor
   funds.

**  Mr. Frischling is an interested person of the trust, as defined in the 1940
    Act, primarily because of payments received by his law firm from the trust
    for services rendered to the independent trustees of the trust.

*** Mr. Graham is an interested person of AIM and the trust, as defined in the
    1940 Act, primarily because of his positions with AIM and its affiliated
    companies, as set forth above, and through his ownership of stock of
    AMVESCAP PLC, which, through A I M Management Group Inc., owns all of the
    outstanding stock of AIM.

WHAT ARE THE RESPONSIBILITIES OF THE BOARD?

     The Board is responsible for the general oversight of the funds' business
and for assuring that the funds are managed in the best interests of each fund's
respective shareholders. The Board periodically reviews the funds' investment

                                        6
<PAGE>   10

performance as well as the quality of other services provided to the funds and
their shareholders by each of the fund's service providers, including AIM and
its affiliates. At least annually, the Board reviews the fees paid by the trust
for these services and the overall level of the funds' operating expenses.

WHY ARE TRUSTEES BEING ELECTED AT THE PRESENT TIME?

     Under the 1940 Act, the Board may fill vacancies on the Board or appoint
new trustees only if, immediately thereafter, at least two-thirds of the
trustees will have been elected by shareholders. Currently, seven of the trust's
ten trustees have been elected by shareholders. As trustees retire, resign or
otherwise cease their service as trustees in the future, the trust may be unable
to fill the vacancies created by such action because three of the trust's ten
trustees have not been elected by shareholders. To provide the Board with the
flexibility to fill vacancies created when trustees cease their service as
trustees, and in light of the fact that only seven of the trust's trustees have
been elected by shareholders, the Board believes it is appropriate for
shareholders to elect trustees at the present time.

HOW LONG CAN TRUSTEES SERVE ON THE BOARD?

     Trustees generally hold office until their successors are elected and
qualified. Pursuant to a policy adopted by the Board in 1992, each duly elected
or appointed independent trustee may continue to serve as a trustee until
December 31 of the year in which the trustee turns age 72. Independent trustees
who were 65 or older and serving on the board of one or more of the AIM funds
when the policy was adopted in 1992 may continue to serve until December 31 of
the year in which the trustees turn 75. A trustee of the trust may resign or be
removed for cause by a vote of the holders of a majority of the outstanding
shares of the funds at any time. A majority of the Board may extend, from time
to time, the retirement date of a trustee. The Board has agreed to extend the
retirement date of Mr. Daly, who otherwise would have retired in December 31,
2000, to December 31, 2001. In making this decision, the Board took into account
Mr. Daly's experience and active participation as a trustee.

WHAT ARE SOME OF THE WAYS IN WHICH THE BOARD REPRESENTS MY INTERESTS?

     The Board seeks to represent shareholder interests by:

     - reviewing the funds' investment performance on an individual basis with
       the funds' respective managers;

     - reviewing the quality of the various other services provided to the funds
       and their shareholders by each of the fund's service providers, including
       AIM and its affiliates;

     - discussing with senior management of AIM steps being taken to address any
       performance deficiencies;

                                        7
<PAGE>   11

     - reviewing the fees paid to AIM and its affiliates to ensure that such
       fees remain reasonable and competitive with those of other mutual funds,
       while at the same time providing sufficient resources to continue to
       provide high-quality services in the future;

     - monitoring potential conflicts between the funds and AIM and its
       affiliates to ensure that the funds continue to be managed in the best
       interests of their shareholders; and

     - monitoring potential conflicts among funds to ensure that shareholders
       continue to realize the benefits of participation in a large and diverse
       family of funds.

WHAT ARE THE COMMITTEES OF THE BOARD?

     The standing Committees of the Board are the Audit Committee, the
Investments Committee and the Nominating and Compensation Committee.

     The members of the Audit Committee are Messrs. Crockett, Daly, Dunn
(Chairman), Fields, Frischling, Pennock and Sklar and Dr. Mathai-Davis. The
Audit Committee is responsible for:

     - considering management's recommendations of independent accountants for
       each fund and evaluating such accountants' performance, costs and
       financial stability;

     - with AIM, reviewing and coordinating audit plans prepared by the funds'
       independent accountants and management's internal audit staff; and

     - reviewing financial statements contained in periodic reports to
       shareholders with the funds' independent accountants and management.

     The members of the Investments Committee are Messrs. Bauer, Crockett, Daly,
Dunn, Fields, Frischling, Pennock and Sklar (Chairman) and Dr. Mathai-Davis. The
Investments Committee is responsible for:

     - overseeing AIM's investment-related compliance systems and procedures to
       ensure their continued adequacy; and

     - considering and acting, on an interim basis between meetings of the full
       Board, on investment-related matters requiring Board consideration,
       including dividends and distributions, brokerage policies and pricing
       matters.

                                        8
<PAGE>   12

     The members of the Nominating and Compensation Committee are Messrs.
Crockett (Chairman), Daly, Dunn, Fields, Pennock and Sklar and Dr. Mathai-Davis.
The Nominating and Compensation Committee is responsible for:

     - considering and nominating individuals to stand for election as
       independent trustees as long as the trust maintains a distribution plan
       pursuant to Rule 12b-1 under the 1940 Act;

     - reviewing from time to time the compensation payable to the independent
       trustees; and

     - making recommendations to the Board regarding matters related to
       compensation, including deferred compensation plans and retirement plans
       for the independent trustees.

     The Nominating and Compensation Committee will consider nominees
recommended by a shareholder to serve as trustees, provided (i) that such person
is a shareholder of record at the time he or she submits such names and is
entitled to vote at the meeting of shareholders at which the trustees will be
elected, and (ii) that the Nominating and Compensation Committee or the Board,
as applicable, shall make the final determination of persons to be nominated.

HOW OFTEN DOES THE BOARD MEET?

     The Board typically conducts regular meetings nine times a year to review
the operations of the funds and of the other AIM funds. Typically, five of these
nine meetings are held in person, each over a two-day period. One or more
Committees of the Board generally meet in conjunction with each in-person
meeting of the Board. In addition, the Board or any Committee may hold special
meetings by telephone or in person to discuss specific matters that may require
action prior to the next regular meeting.

     During the fiscal year ended August 31, 1999, the Board held 9 meetings,
the Audit Committee held 5 meetings, the Investments Committee held 4 meetings
and the Nominating and Compensation Committee held 6 meetings. All of the
current trustees and Committee members then serving attended at least 75% of the
meetings of the Board or applicable Committee held during the fiscal year ended
August 31, 1999.

WHAT ARE THE TRUSTEES PAID FOR THEIR SERVICES?

     Each trustee is reimbursed for expenses incurred in connection with each
meeting of the Board or any Committee attended. Each trustee who is not also an
officer of the trust is compensated for his or her services according to a fee
schedule which recognizes the fact that such trustee also serves as a director
or trustee of all of the other AIM funds. Each such trustee receives a fee,
allocated

                                        9
<PAGE>   13

among the AIM funds for which he or she serves as a director or trustee, which
consists of an annual retainer component and a meeting fee component.

     Set forth below is information regarding compensation paid or accrued for
each trustee:

<TABLE>
<CAPTION>
                                                                              TOTAL
                                                     RETIREMENT BENEFITS   COMPENSATION
                            AGGREGATE COMPENSATION     ACCRUED BY ALL        FROM ALL
         TRUSTEE             FROM THE TRUSTEE(1)        AIM FUNDS(2)       AIM FUNDS(3)
         -------            ----------------------   -------------------   ------------
<S>                         <C>                      <C>                   <C>
Charles T. Bauer..........          $    0                $      0           $      0
Bruce L. Crockett.........           5,724                  37,485            103,500
Owen Daly II..............           5,724                 122,898            103,500
Edward K. Dunn Jr. .......           5,724                       0            103,500
Jack M. Fields............           5,695                  15,826            101,500
Carl Frischling(4)........           5,694                  97,791            103,500
Robert H. Graham..........               0                       0                  0
John F. Kroeger(5)........             506                 107,896                  0
Prema Mathai-Davis........           5,344                       0            101,500
Lewis F. Pennock..........           5,694                  45,766            103,500
Ian W. Robinson(6)........           3,551                  94,442             25,000
Louis S. Sklar............           5,694                  90,232            101,500
</TABLE>

(1) The total amount of compensation deferred by all trustees of the trust
    during the fiscal year ended August 31, 1999, including earnings thereon,
    was $36,280.

(2) During the fiscal year ended August 31, 1999, the total amount of expenses
    allocated to the trust in respect of such retirement benefits was $35,554.
    Data reflects compensation for the calendar year ended December 31, 1999.
    Accruals for 1999 are based on actuarial projections from 1998.

(3) Each trustee serves as a trustee or director of a total of at least 12
    registered investment companies advised by AIM. Data reflects compensation
    for the calendar year ended December 31, 1999.

(4) During the fiscal year ended August 31, 1999, the trust paid $19,950 in
    legal fees to Mr. Frischling's law firm, Kramer Levin Naftalis & Frankel,
    LLP, for services rendered to the independent trustees of the trust.

(5) Mr. Kroeger was a trustee until June 11, 1998, when he resigned. On that
    date, he became a consultant to the trust. Mr. Kroeger passed away on
    November 26, 1998. Mr. Kroeger's widow will receive his pension as described
    below under "AIM Funds Retirement Plan for Eligible Directors/Trustees."

(6) Mr. Robinson was a trustee until March 12, 1999, when he retired.

  AIM Funds Retirement Plan for Eligible Directors/Trustees

     Under the terms of the A I M Funds Retirement Plan for Eligible Trustees/
Directors, each trustee (who is not an employee of any of the AIM funds, A I M
Management Group Inc. (AIM Management) or any of their affiliates) may be
entitled to certain benefits upon retirement from the Board. Pursuant to such
retirement plan, a trustee becomes eligible to retire and receive full benefits
under the plan when he or she has attained age 65 and has completed at least
five years of continuous service with one or more of the regulated investment
companies managed, administered or distributed by AIM or its affiliates (the
applicable AIM funds). Each eligible trustee is entitled to receive an annual
                                       10
<PAGE>   14

benefit from the applicable AIM funds commencing on the first day of the
calendar quarter coincident with or following his or her date of retirement
equal to a maximum of 75% of the annual retainer paid or accrued by the
applicable AIM funds for such trustee during the twelve-month period immediately
preceding the trustee's retirement (including amounts deferred under a separate
agreement between the applicable AIM funds and the trustee) and based on the
number of such trustee's years of service (not in excess of 10 years of service)
completed with respect to any of the applicable AIM funds. Such benefit is
payable to each eligible trustee in quarterly installments. If an eligible
trustee dies after attaining the normal retirement date but before receipt of
all benefits under the plan, the trustee's surviving spouse (if any) shall
receive a quarterly survivor's benefit equal to 50% of the amount payable to the
deceased trustee for no more than ten years beginning the first day of the
calendar quarter following the date of the trustee's death. Payments under the
plan are not secured or funded by any applicable AIM fund.

     Set forth below is a table that shows the estimated annual benefits payable
to an eligible trustee upon retirement assuming the retainer amount reflected
below and various years of service. The estimated credited years of service for
Messrs. Crockett, Daly, Dunn, Fields, Frischling, Kroeger, Pennock, Robinson and
Sklar and Dr. Mathai-Davis are 13, 13, 2, 3, 23, 20, 18, 11, 10 and 1 years,
respectively.

                   ESTIMATED ANNUAL BENEFITS UPON RETIREMENT

<TABLE>
<CAPTION>
                                   ANNUAL
                                 RETIREMENT
                                COMPENSATION
                                PAID BY ALL
 NUMBER OF YEARS OF SERVICE      APPLICABLE
WITH THE APPLICABLE AIM FUNDS   A I M FUNDS
- -----------------------------   ------------
<S>                             <C>
10...........................     $67,500
 9...........................     $60,750
 8...........................     $54,000
 7...........................     $47,250
 6...........................     $40,500
 5...........................     $33,750
</TABLE>

  Deferred Compensation Agreements

     Messrs. Daly, Dunn, Fields, Frischling, and Sklar and Dr. Mathai-Davis (the
deferring trustees) have each executed a deferred compensation agreement.
Pursuant to the agreements, the deferring trustees may elect to defer receipt of
up to 100% of their compensation payable by the trust, and such amounts are
placed into a deferral account. Currently, the deferring trustees may select
various AIM funds in which all or part of their deferral accounts shall be
deemed to be invested. Distributions from the deferring trustees' accounts will
be paid in cash, in generally equal quarterly installments over a period of five
(5) or ten

                                       11
<PAGE>   15

(10) years (depending on the agreement) beginning on the date the deferring
trustee's retirement benefits commence under the plan. The Board, in its sole
discretion, may accelerate or extend the distribution of such deferral accounts
after the deferring trustee's termination of service as a trustee of the trust.
If a deferring trustee dies prior to the distribution of amounts in his deferral
account, the balance of the deferral account will be distributed to his
designated beneficiary in a single lump sum payment as soon as practicable after
such deferring trustee's death. The agreements are not funded and, with respect
to the payments of amounts held in the deferral accounts, the deferring trustees
have the status of unsecured creditors of the trust and of each other AIM fund
from which they are deferring compensation.

WHAT ARE THE OFFICERS PAID FOR THEIR SERVICES?

     The trust does not pay its officers for the services they provide to the
trust. Instead, the officers, who are also officers or employees of AIM or its
affiliates, are compensated by AIM Management or its affiliates.

WHAT IS THE BOARD'S RECOMMENDATION ON PROPOSAL 1?

       -----------------------------------------------------------------
          YOUR BOARD, INCLUDING THE INDEPENDENT TRUSTEES, UNANIMOUSLY
                 RECOMMENDS THAT YOU VOTE "FOR" THIS PROPOSAL.
       -----------------------------------------------------------------

          PROPOSAL 2:  APPROVAL OF A NEW INVESTMENT ADVISORY AGREEMENT

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 2 applies to all shareholders of all funds.

WHAT AM I BEING ASKED TO APPROVE?

     The Board recommends that you approve a new advisory agreement between AIM
and the trust for your fund. The Board is asking you to vote on this new
agreement because the trust may amend its advisory agreement only with
shareholder approval. A form of the trust's proposed Master Investment Advisory
Agreement is set forth in Appendix B. The proposed advisory agreement amends the
current advisory agreement primarily by:

     - omitting references to the provision of administrative services to the
       funds;

     - omitting certain expense limitations that are no longer applicable;

     - clarifying existing non-exclusivity provisions;

                                       12
<PAGE>   16

     - clarifying existing delegation provisions;

     - adding provisions regarding affiliated brokerage;

     - adding certain provisions to fully implement the funds' securities
       lending program; and

     - clarifying existing liability provisions.

     At a meeting held on February 3, 2000, the Board voted to recommend that
you approve a proposal to adopt the new advisory agreement.

WHO IS THE FUNDS' INVESTMENT ADVISOR?

     AIM became the investment advisor for each of the funds on the dates
indicated in Appendix C. The current Master Investment Advisory Agreement was
executed, and the funds' shareholders last voted on such agreement, on the dates
indicated in Appendix C. The Board, including a majority of the independent
trustees, last approved the current advisory agreement on May 11, 1999.

     AIM is a wholly owned subsidiary of AIM Management, a holding company that
has been engaged in the financial services business since 1976. The address of
AIM and AIM Management is 11 Greenway Plaza, Suite 100, Houston, Texas 77046.
AIM was organized in 1976, and, together with its subsidiaries, advises or
manages approximately 120 investment portfolios encompassing a broad range of
investment objectives. AIM Management is an indirect wholly owned subsidiary of
AMVESCAP PLC, 11 Devonshire Square, London EC2M 4YR, United Kingdom. AMVESCAP
PLC and its subsidiaries are an independent investment management group engaged
in institutional investment management and retail mutual fund businesses in the
United States, Europe and the Pacific Region. A list of the principal executive
officer and the directors of AIM is in Appendix D.

DO ANY OF THE TRUST'S TRUSTEES OR EXECUTIVE OFFICERS HOLD POSITIONS WITH AIM?

     Charles T. Bauer, Robert H. Graham, Gary T. Crum, Carol F. Relihan,
Melville B. Cox, Dana R. Sutton, Karen Dunn Kelley and J. Abbott Sprague, all of
whom are directors and/or officers of the company, also are directors and/or
officers of AIM. Each of them also owns shares of AMVESCAP PLC and/or options to
purchase shares of AMVESCAP PLC.

WHAT ARE THE TERMS OF THE CURRENT ADVISORY AGREEMENT?

     Under the terms of the current advisory agreement, AIM supervises all
aspects of the funds' operations and provides investment advisory services to
the funds. AIM obtains and evaluates economic, statistical and financial
information to formulate and implement investment programs for the funds. AIM
will not be

                                       13
<PAGE>   17

liable to the funds or their shareholders except in the case of AIM's willful
misfeasance, bad faith, gross negligence or reckless disregard of duty.

     The current advisory agreement provides that the funds will pay or cause to
be paid all of their expenses not assumed by AIM, including without limitation:

     - brokerage commissions;

     - taxes;

     - legal, accounting, auditing or governmental fees;

     - the cost of preparing share certificates;

     - custodian, transfer and shareholder service agent costs;

     - expenses of issue, sale, redemption, and repurchase of shares;

     - expenses of registering and qualifying shares for sale;

     - expenses relating to trustee and shareholder meetings;

     - the cost of preparing and distributing reports and notices to
       shareholders;

     - the fees and other expenses incurred by the funds in connection with
       membership in investment company organizations;

     - the cost of printing copies of prospectuses and statements of additional
       information distributed to the funds' shareholders; and

     - all other charges and costs of the funds' operations unless otherwise
       explicitly provided.

     The current advisory agreement will continue in effect from year to year
for each fund only if such continuance is specifically approved at least
annually by (i) the Board or the vote of a majority of the outstanding voting
securities of that fund (as defined in the 1940 Act), and (ii) the affirmative
vote of a majority of independent trustees by votes cast in person at a meeting
called for such purpose. The current advisory agreement provides that the Board,
a majority of the outstanding voting securities of a fund or AIM may terminate
the agreement for a fund on 60 days' written notice without penalty. The
agreement terminates automatically in the event of its assignment.

     AIM may from time to time waive or reduce its fee. AIM may rescind
voluntary fee waivers or reductions at any time without further notice to
investors. During periods of voluntary fee waivers or reductions, AIM will
retain its ability to be reimbursed for such fee waiver or reduction prior to
the end of each fiscal year. If AIM has agreed to contractual fee waivers or
reductions, AIM may not alter those arrangements to a fund's detriment during
the period stated in the agreement between AIM and the trust. AIM may not change
provisions in the current advisory agreement imposing expense limitations
without shareholder approval.
                                       14
<PAGE>   18

     The annual rates at which AIM receives fees from each fund under the
current advisory agreement, as well as the dollar amounts of advisory fees net
of any expense limitations or fee waivers paid to AIM by each fund, and the
advisory fees (if any) waived by AIM for each fund for the fiscal year ended
August 31, 1999, are in Appendix E.

WHAT ADDITIONAL SERVICES ARE PROVIDED BY AIM AND ITS AFFILIATES?

     AIM and its affiliates also provide additional services to the trust and
the funds. AIM provides, or arranges for others to provide, administrative
services to the funds. Fund Management Company serves as the principal
underwriter for the funds and A I M Fund Services, Inc. serves as the funds'
transfer agent. These companies are wholly owned subsidiaries of AIM.
Information concerning fees paid to AIM and its affiliates for these services is
in Appendix F.

WHAT ADVISORY FEES DOES AIM CHARGE FOR SIMILAR FUNDS IT MANAGES?

     The advisory fee schedules for other funds advised by AIM with similar
investment objectives as the funds are in Appendix G.

WHAT ARE THE TERMS OF THE PROPOSED ADVISORY AGREEMENT?

     The primary differences between the current advisory agreement and the
proposed advisory agreement that the Board approved are:

     - To omit references to the provision of administrative services to the
       funds by AIM, because such services are covered by a separate
       administrative services agreement between AIM and the trust;

     - To omit certain expense limitations that are no longer applicable;

     - To clarify non-exclusivity provisions that are set forth in the current
       advisory agreement;

     - To clarify delegation provisions that are set forth in the current
       advisory agreement;

     - To add provisions regarding affiliated brokerage;

     - To add certain provisions to fully implement the funds' securities
       lending program; and

     - To clarify that one fund is not liable for another fund's obligations,
       and that AIM's liability to one fund does not automatically extend to
       another fund.

     Each of these changes is discussed more fully below. Except for these
changes, the terms of the current advisory agreement and the proposed advisory
agreement are substantially similar, except for the effective dates and the
renewal dates.

                                       15
<PAGE>   19

  Administrative Services

     The trust and AIM are parties to a Master Administrative Services Agreement
dated February 28, 1997, as amended on September 1, 1998. The current advisory
agreement states that AIM will provide certain administrative services to the
funds at the Board's request. The Board has traditionally asked AIM to provide
such services to the funds. AIM then provides such services pursuant to the
Master Administrative Services Agreement.

     The Board proposes to separate the advisory services and the administrative
services that AIM provides to the trust, so that the provision of administrative
services is dealt with solely in a Master Administrative Services Agreement. As
a result, the proposed advisory agreement omits all references to the Master
Administrative Services Agreement. Since this omission will not change the
administrative services that AIM provides to the trust or the compensation AIM
receives for providing administrative services, the Board believes that this
change is a matter of form rather than a substantive change in the relationship
between AIM and the trust.

  Expense Limitations

     The current advisory agreement provides that advisory fees will be reduced
in accordance with certain expense limitations set forth in securities
regulations of the states in which the funds' shares are qualified for sale.
States can no longer impose expense limitations because federal law has
pre-empted these state regulations. Accordingly, the Board believes that this
expense limitation provision should be omitted from the proposed advisory
agreement.

  Non-Exclusivity Provisions

     The current advisory agreement provides that neither AIM nor the trustees
or officers of the trust owe an exclusive duty to the trust. The current
advisory agreement expressly permits AIM to render investment advisory,
administrative and other services to other entities (including investment
companies). The current advisory agreement also expressly permits the trustees
and officers of the trust to serve as partners, officers, directors or trustees
of other entities (including other investment advisory companies). The Board
believes that the non-exclusivity provision in the current advisory agreement
should be bifurcated into two separate provisions: one dealing with AIM and the
other dealing with officers and trustees of the trust.

     The non-exclusivity provisions of the proposed advisory agreement are
substantially similar to the provision in the current advisory agreement.
However, the proposed advisory agreement explicitly states that the trust
recognizes that AIM's obligations to other clients may adversely affect the
trust's ability to participate in certain investment opportunities. The proposed
advisory agreement also explicitly states that AIM, in its sole discretion,
shall be entitled to

                                       16
<PAGE>   20

determine the allocation of investment opportunities among the AIM funds and
other clients in accordance with a policy that AIM believes to be equitable.

  Delegation

     The proposed advisory agreement expands the extent to which AIM can
delegate its rights, duties and obligations by expressly providing that AIM may
delegate any or all of its rights, duties or obligations under the agreement to
one or more sub-advisors. It also provides that AIM may replace sub-advisors
from time to time in accordance with applicable federal securities laws and
rules and regulations in effect or interpreted from time to time by the SEC or
with exemptive orders or other similar relief. If, in accordance with the laws,
rules, interpretations and exemptions, AIM is not required to seek shareholder
approval of a substitution in sub-advisors, it may do so upon approval of the
Board.

  Affiliated Brokerage

     Although AIM does not currently execute trades through brokers or dealers
that are affiliated with AIM, the proposed advisory agreement includes a new
provision that would permit such trades, subject to compliance with applicable
federal securities laws.

  Securities Lending

     The proposed advisory agreement includes a new provision that discusses the
services to be rendered by AIM if a fund engages in securities lending
activities, as well as the compensation AIM may receive for such services.
Services to be provided include: (a) overseeing participation in the securities
lending program to ensure compliance with all applicable regulatory and
investment guidelines; (b) assisting the securities lending agent or principal
(the agent) in determining which specific securities are available for loan; (c)
monitoring the agent to ensure that securities loans are effected in accordance
with AIM's instructions and with procedures adopted by the Board; (d) preparing
appropriate periodic reports for, and seeking appropriate approvals from, the
Board with respect to securities lending activities; (e) responding to agent
inquiries; and (f) performing such other duties as may be necessary.

     As compensation for such services, a lending fund shall pay AIM a fee equal
to 25% of the net monthly interest or fee income retained or paid to the fund
from such activities. AIM currently intends to waive such fees, and has agreed
to seek Board approval prior to its receipt of all or a portion of such fees.

  Liability

     The proposed advisory agreement clarifies that no fund shall be liable for
the obligations of another fund, and the liability of AIM to one fund shall not
automatically render AIM liable to any other fund.

                                       17
<PAGE>   21

WHAT DID THE TRUSTEES CONSIDER IN APPROVING THE ADVISORY AGREEMENT?

     At the request of AIM, the Board discussed the approval of the proposed
advisory agreement at a meeting held in person on February 3, 2000. The
independent trustees also discussed approval of the proposed advisory agreement
with independent counsel at that meeting. In evaluating the proposed advisory
agreement, the Board requested and received information from AIM to assist in
its deliberations. The Board considered various matters in determining the
reasonableness and fairness of the proposed changes in the current advisory
agreement with respect to each fund. In so doing, the Board considered the fact
that the changes (i) would not result in any changes in the persons providing
investment advisory services to the funds; (ii) would not result in any changes
to the types or level of services provided by AIM to the funds (other than to
have AIM provide certain additional services if a fund engages in securities
lending); (iii) would not result in any changes to the advisory fees payable by
the funds (other than to permit AIM's receipt of fees in connection with
securities lending); (iv) would clarify the terms under which AIM will provide
investment advisory services to the funds; and (v) would omit outdated, or
otherwise unnecessary, provisions from the new advisory agreement. After
considering these matters, the Board concluded that it is in the best interests
of the funds and their shareholders to approve the new advisory agreement.

     The Board reached its conclusion after careful discussion and analysis. The
Board believes that it has carefully and thoroughly examined the pertinent
issues and alternatives. In recommending that you approve the proposed advisory
agreement, the independent trustees have considered what they believe to be in
your best interests. In so doing, they were advised by independent counsel,
retained by the independent trustees and paid for by the trust, as to the nature
of the matters to be considered and the standards to be used in reaching their
decision.

WHEN WILL PROPOSAL 2 BE IMPLEMENTED?

     If approved, the new advisory agreement will become effective on May 30,
2000 and will expire, unless renewed, on or before June 30, 2001. If
shareholders do not approve the proposed advisory agreement with respect to a
fund, the current advisory agreement will continue in effect for such fund.

WHAT IS THE BOARD'S RECOMMENDATION ON PROPOSAL 2?

       -----------------------------------------------------------------
          YOUR BOARD, INCLUDING THE INDEPENDENT TRUSTEES, UNANIMOUSLY
                 RECOMMENDS THAT YOU VOTE "FOR" THIS PROPOSAL.
       -----------------------------------------------------------------

                                       18
<PAGE>   22

                     PROPOSALS 3(a) THROUGH 3(j):  CHANGES
                         TO THE FUNDAMENTAL INVESTMENT
                           RESTRICTIONS OF EACH FUND

WHAT AM I BEING ASKED TO APPROVE?

     The Board recommends that you approve changing your fund's investment
restrictions. The Board is asking you to vote on these changes because the
investment restrictions described below are fundamental and shareholders must
approve any change.

     Pursuant to the 1940 Act, each fund has adopted certain fundamental
restrictions covering certain types of investment practices, which may be
changed only with shareholder approval. Restrictions that a fund has not
specifically designated as being fundamental are considered to be
"non-fundamental" and may be changed by the Board without shareholder approval.
In addition to investment restrictions, the funds operate pursuant to investment
objectives and policies. These objectives and policies govern the investment
activities of the funds and further limit their ability to invest in certain
types of securities or engage in certain types of transactions.

     The Board is proposing that you approve changes to your fund's fundamental
investment restrictions. The changes will conform these restrictions to a set of
uniform model restrictions under which most AIM funds will operate. The Board
approved the changes to your fund's fundamental investment restrictions at a
meeting held on February 3, 2000. The current fundamental investment
restrictions for each fund are in Appendix H.

WHAT ARE THE REASONS FOR THE PROPOSED CHANGES TO THE FUNDAMENTAL RESTRICTIONS?

     Several of the funds' current fundamental restrictions reflect regulatory,
business or industry conditions, practices or requirements that are no longer
applicable. For example, the National Securities Markets Improvement Act of 1996
(NSMIA) preempted state laws, under which the funds previously were regulated
and which required the adoption of certain restrictions. In addition, other
fundamental restrictions reflect federal regulatory requirements that remain in
effect but are not required to be stated as fundamental, or in some cases even
as non-fundamental, restrictions. Also, as new AIM funds have been created or
acquired during recent years, substantially similar fundamental restrictions
often have been phrased in slightly different ways, sometimes resulting in minor
but unintended differences in effect or potentially giving rise to unintended
differences in interpretation.

     Accordingly, the Board has approved changes to certain of the funds'
fundamental restrictions in order to simplify, modernize and make more uniform
those restrictions that are required to be fundamental.

                                       19
<PAGE>   23

     The Board expects that you will benefit from these changes in a number of
ways. The proposed uniform restrictions will provide the funds with as much
investment flexibility as is possible under the 1940 Act. The Board believes
that eliminating the disparities among the funds' fundamental restrictions will
enhance management's ability to manage efficiently and effectively the funds'
assets in changing regulatory and investment environments. In addition, by
reducing to a minimum those restrictions that can be changed only by shareholder
vote, each fund will be able to avoid the costs and delays associated with a
shareholder meeting if the Board decides to make future changes to a fund's
investment policies.

WHAT ARE THE PROPOSED CHANGES TO THE FUNDAMENTAL RESTRICTIONS?

     Each proposed change to the funds' fundamental restrictions is discussed
below. The proposed fundamental restrictions will provide the funds with the
ability to operate under new interpretations of the 1940 Act or pursuant to
exemptive relief from the SEC without receiving prior shareholder approval of
operating under such interpretations or exemptions. Even though the funds will
have this flexibility, if the proposed fundamental restrictions are approved,
several new non-fundamental investment restrictions (which function as internal
operating guidelines) will become effective. AIM must follow these non-
fundamental restrictions in managing the funds. Of course, if circumstances
change, the Board may change or eliminate any non-fundamental investment
restriction in the future without shareholder approval.

     With respect to each fund and each fundamental or non-fundamental
restriction, if a percentage restriction is adhered to at the time of an
investment or transaction, a later increase or decrease in percentage resulting
from a change in the values of the fund's portfolio securities or the amount of
its total assets will not be considered a violation of the restriction.

                  PROPOSAL 3(a):  CHANGE TO THE OR ADDITION OF
               FUNDAMENTAL RESTRICTION ON ISSUER DIVERSIFICATION

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(a) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(a), the existing fundamental restriction on
issuer diversification for Government & Agency and Treasury would be changed,
and a new fundamental restriction on portfolio diversification would be added
for Treasury TaxAdvantage, as follows:

     "The fund is a 'diversified company' as defined in the 1940 Act. The
     fund will not purchase the securities of any issuer if, as a result,
     the fund would fail to be a diversified company within the meaning of
     the

                                       20
<PAGE>   24

     1940 Act, and the rules and regulations promulgated thereunder, as
     such statute, rules and regulations are amended from time to time or
     are interpreted from time to time by the SEC staff (collectively, the
     1940 Act laws and interpretations) or except to the extent that the
     fund may be permitted to do so by exemptive order or similar relief
     (collectively, with the 1940 Act laws and interpretations, the 1940
     Act laws, interpretations and exemptions). In complying with this
     restriction, however, the fund may purchase securities of other
     investment companies to the extent permitted by the 1940 Act laws,
     interpretations and exemptions."

  Discussion:

     The proposed changes will permit the funds to take advantage of the 1940
Act laws, interpretations and exemptions in effect from time to time relating to
issuer diversification.

     Treasury TaxAdvantage currently states that the fund is a diversified
company but does not have a fundamental investment restriction on portfolio
diversification. As a result, adoption of this restriction will have no effect
on the operation of Treasury TaxAdvantage.

     With respect to Government & Agency and Treasury, the proposed change would
eliminate minor inconsistencies in the wording of the funds' current fundamental
diversification restrictions and the uniform fundamental diversification
restriction proposed above. The Board does not expect this change to have any
material impact on the funds' current operations.

     If you approve the proposed change, the following non-fundamental
investment restriction will become effective for each fund:

     "In complying with the fundamental restriction regarding issuer
     diversification, the fund will not, with respect to 100% of its total
     assets, purchase the securities of any issuer (other than securities
     issued or guaranteed by the U.S. Government or any of its agencies or
     instrumentalities), if, as a result, (i) more than 5% of the fund's
     total assets would be invested in the securities of that issuer,
     except as permitted by Rule 2a-7 under the 1940 Act, or (ii) the fund
     would hold more than 10% of the outstanding voting securities of that
     issuer. The fund may (i) purchase securities of other investment
     companies as permitted by Section 12(d)(1) of the 1940 Act and (ii)
     invest its assets in securities of other money market funds and lend
     money to other investment companies and their series portfolios that
     have AIM as an investment advisor, subject to the terms and conditions
     of any exemptive orders issued by the SEC."

                                       21
<PAGE>   25

   PROPOSAL 3(b):  CHANGE TO FUNDAMENTAL RESTRICTIONS ON BORROWING MONEY AND
                           ISSUING SENIOR SECURITIES

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(b) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(b), the existing fundamental restriction on
issuing senior securities and borrowing money for each of the funds would be
changed to read as follows:

     "The fund may not borrow money or issue senior securities, except as
     permitted by the 1940 Act laws, interpretations and exemptions."

  Discussion:

     The 1940 Act establishes limits on the ability of the funds to borrow money
or issue "senior securities," a term that is defined, generally, to refer to
obligations that have a priority over the trust's shares of beneficial interest
with respect to the distribution of its assets or the payment of dividends.
Currently, the fundamental restriction for the funds is more limiting than
required by the 1940 Act.

     The proposed changes would make the funds' restriction on borrowing money
no more limiting than required by the 1940 Act. The Board believes that changing
the funds' fundamental restrictions in this manner will provide flexibility for
future contingencies. However, the Board does not currently expect this change
to have any material impact on the funds' current operations.

     If you approve the proposed change, the following non-fundamental
investment restriction will become effective for each of the funds:

     "In complying with the fundamental restriction regarding borrowing
     money and issuing senior securities, the fund may borrow money in an
     amount not exceeding 33 1/3% of its total assets (including the amount
     borrowed) less liabilities (other than borrowings). The fund may
     borrow from banks, broker/dealers or other investment companies or
     their series portfolios that have AIM or an affiliate of AIM as an
     investment advisor (an AIM fund). The fund may not borrow for
     leveraging, but may borrow for temporary or emergency purposes, in
     anticipation of or in response to adverse market conditions, or for
     cash management purposes. The fund may not purchase additional
     securities when any borrowings from banks exceed 5% of the fund's
     total assets."

                                       22
<PAGE>   26

               PROPOSAL 3(c):  CHANGE TO FUNDAMENTAL RESTRICTION
                           ON UNDERWRITING SECURITIES

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(c) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(c), the existing fundamental restriction on
underwriting securities for each of the funds would be changed to read as
follows:

     "The fund may not underwrite the securities of other issuers. This
     restriction does not prevent the fund from engaging in transactions
     involving the acquisition, disposition or resale of its portfolio
     securities, regardless of whether the fund may be considered to be an
     underwriter under the Securities Act of 1933."

  Discussion:

     The proposed change to this fundamental restriction would expand the types
of transactions in which a fund may engage even if it may be considered an
underwriter . Otherwise, the proposed restriction is substantially similar to
the funds' current investment restrictions.

  PROPOSAL 3(d):  CHANGE TO FUNDAMENTAL RESTRICTION ON INDUSTRY CONCENTRATION

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(d) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(d), the existing fundamental restriction on
industry concentration for each of the funds would be changed to read as
follows:

     "The fund will not make investments that will result in the
     concentration (as that term may be defined or interpreted by the 1940
     Act laws, interpretations and exemptions) of its investments in the
     securities of issuers primarily engaged in the same industry. This
     restriction does not limit the fund's investments in (i) obligations
     issued or guaranteed by the U.S. Government, its agencies or
     instrumentalities, (ii) tax-exempt obligations issued by governments
     or political subdivisions of governments, or (iii) bank instruments.
     In complying with this restriction, the fund will not consider a
     bank-issued guaranty or financial guaranty insurance as a separate
     security."

                                       23
<PAGE>   27

  Discussion:

     The proposed changes in this restriction would clarify that for the
industry concentration purposes, the funds will not consider a bank-issued
guaranty or financial guaranty insurance as a separate security. The proposed
changes will permit the funds to take advantage of laws, interpretations and
exemptions in effect from time to time relating to concentration issues.

     If you approve the proposed change, the following non-fundamental
investment restriction will become effective for each of the funds:

     "In complying with the fundamental restriction regarding industry
     concentration, the fund may invest up to 25% of its total assets in
     the securities of issuers whose principal business activities are in
     the same industry."

               PROPOSAL 3(e):  CHANGE TO FUNDAMENTAL RESTRICTION
                      ON PURCHASING OR SELLING REAL ESTATE

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(e) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(e), the existing fundamental restriction on
real estate investments for each of the funds would be changed to read as
follows:

     "The fund may not purchase real estate or sell real estate unless
     acquired as a result of ownership of securities or other instruments.
     This restriction does not prevent the fund from investing in issuers
     that invest, deal, or otherwise engage in transactions in real estate
     or interests therein, or investing in securities that are secured by
     real estate or interests therein."

  Discussion:

     The proposed changes to this fundamental restriction would clarify the
types of real estate related securities that are permissible investments for
each fund. In addition, the proposed restriction includes an exception that
permits each fund to hold real estate acquired as a result of ownership of
securities or other instruments.

                                       24
<PAGE>   28

   PROPOSAL 3(f):  CHANGE TO FUNDAMENTAL RESTRICTION ON PURCHASING OR SELLING
 COMMODITIES, ON PURCHASING SECURITIES ON MARGIN, SHORT SALES OF SECURITIES AND
                           INVESTING IN PUTS OR CALLS

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(f) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(f), the existing fundamental restriction
that prohibits the purchase of commodities and commodity futures contracts, as
well as, margin transactions, short sales of securities and investing in puts or
calls for each of the funds would be changed to read as follows:

     "The fund may not purchase physical commodities or sell physical
     commodities unless acquired as a result of ownership of securities or
     other instruments. This restriction does not prevent the fund from
     engaging in transactions involving futures contracts and options
     thereon or investing in securities that are secured by physical
     commodities."

  Discussion:

     The proposed changes to the fundamental restrictions on purchasing or
selling commodities are intended to conform these restrictions to similar
restrictions in effect for other AIM funds. The Board does not expect this
change to have any material impact on the funds' current operations. The funds
do not intend to engage in futures contracts or options thereon or invest in
securities that are secured by physical commodities.

     The funds are not required to have fundamental restrictions with regard to
margin transactions, short sales of securities, or investing in put or call
options. Thus, in order to conform the fundamental restrictions for all AIM
funds, the Board believes that the funds' fundamental restrictions with regard
to margin transactions, short sales of securities, and investing in put or call
options should be eliminated. The Board also does not expect this change to have
any material impact on the funds' current operations. The funds do not intend to
engage in short sales or put or call options. The funds also will not purchase
any security on margin, except that each fund may obtain such short-term credits
as may be necessary for the clearance of purchases and sales of portfolio
securities.

       PROPOSAL 3(g):  CHANGE TO FUNDAMENTAL RESTRICTION ON MAKING LOANS

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(g) applies to shareholders of all funds.

                                       25
<PAGE>   29

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(g), the existing fundamental restriction on
making loans for each of the funds would be changed to read as follows:

     "The fund may not make personal loans or loans of its assets to
     persons who control or are under common control with the fund, except
     to the extent permitted by 1940 Act laws, interpretations and
     exemptions. This restriction does not prevent the fund from, among
     other things, purchasing debt obligations, entering into repurchase
     agreements, loaning its assets to broker-dealers or institutional
     investors, or investing in loans, including assignments and
     participation interests."

  Discussion:

     The proposed changes to this fundamental restriction would broaden the
situations in which a fund could lend its assets and would eliminate minor
differences in the wording of the funds' current restriction on making loans. In
addition, the proposed restriction more completely describes various types of
debt instruments available in the financial markets that the funds may purchase
that do not constitute the making of a loan, and broadens the potential
circumstances under which the funds could make loans.

     If you approve the proposed change, the following non-fundamental
investment restriction will become effective for each of the funds:

     "In complying with the fundamental restriction with regard to making
     loans, the fund may lend up to 33 1/3% of its total assets and may
     lend money to another AIM fund, on such terms and conditions as the
     SEC may require in an exemptive order."

    PROPOSAL 3(h):  APPROVAL OF A NEW FUNDAMENTAL INVESTMENT RESTRICTION ON
            INVESTING ALL OF EACH FUND'S ASSETS IN AN OPEN-END FUND

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(h) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(h), the following fundamental investment
restriction on investing in an open-end fund would be added for each of the
funds:

     "The fund may, notwithstanding any other fundamental investment policy
     or limitation, invest all of its assets in the securities of a single
     open-end management investment company with substantially the

                                       26
<PAGE>   30

     same fundamental investment objectives, policies and restrictions as
     the fund."

  Discussion:

     The Board has approved, subject to shareholder approval, the adoption of a
new fundamental investment restriction that would permit each of the funds to
invest all of its assets in another open-end fund. At present the Board has not
considered any specific proposal to authorize a fund to invest all of its assets
in this fashion. The Board will authorize investing a fund's assets in another
open-end fund only if the Board first determines that is in the best interests
of such fund and its shareholders.

     The purpose of this proposal is to enhance the flexibility of each fund and
permit it to take advantage of potential efficiencies in the future available
through investment in another open-end fund. This structure allows several funds
with different distribution pricing structures, but the same investment
objective, policies and limitations, to combine their assets in a pooled fund
instead of managing them separately. This could lower the costs of obtaining
portfolio execution, custodial, investment advisory and other services for the
fund and could assist in portfolio management to the extent the cash flows of
each investment vehicle offset each other or provide for less volatile asset
changes. Of course, such benefits may not occur.

     At present, certain of the fundamental investment restrictions of each fund
may prevent it from investing all of its assets in another registered investment
company and would require a vote of fund shareholders before such a structure
could be adopted. To avoid the costs associated with a subsequent shareholder
meeting, the Board recommends that you vote to permit the assets of your fund to
be invested in an open-end fund, without a further vote of shareholders, but
only if the Board subsequently determines that such action is in the best
interests of your fund and its shareholders. If you approve this proposal, the
fundamental restrictions of your fund would be changed to permit such
investment.

     A fund's methods of operation and shareholder services would not be
materially affected by its investment in an open-end fund, except that the
assets of the fund might be managed as part of a larger pool. If a fund invested
all of its assets in an open-end fund, it would hold only investment securities
issued by the open-end fund, and the open-end fund would invest directly in
individual securities of other issuers. The fund otherwise would continue its
normal operations. The Board would retain the right to withdraw the fund's
investments from the open-end fund, and the fund then would resume investing
directly in individual securities of other issuers as it does currently.

     AIM may benefit from the use of this structure if, as a result, overall
assets under management are increased (since management fees are based on
assets). Also, AIM's expense of providing investment and other services to the
funds may be reduced.

                                       27
<PAGE>   31

     If you approve the proposed restriction, each fund will have the ability to
invest all of its assets in another open-end investment company. Because the
funds do not currently intend to do so, the following non-fundamental investment
restriction will become effective for each of the funds:

     "Notwithstanding the fundamental investment restriction with regard to
     investing all assets in an open-end fund, the fund may not invest all
     of its assets in the securities of a single open-end management
     investment company with the same fundamental investment objectives,
     policies and limitations as the fund."

PROPOSAL 3(I):  ELIMINATION OF FUNDAMENTAL RESTRICTION ON MORTGAGING OR PLEDGING
                                     ASSETS

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(i) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(i), the existing fundamental restriction on
mortgaging or pledging assets for each of the funds would be eliminated.

  Discussion:

     The funds are not required to have a fundamental restriction with respect
to the mortgaging or pledging of assets. In order to maximize the funds'
flexibility in this area, the Board believes that the funds' restriction on
mortgaging or pledging assets should be eliminated. The Board does not expect
this change to have any impact on the funds' operations.

                   PROPOSAL 3(J):  ELIMINATION OF FUNDAMENTAL
 RESTRICTION ON INVESTING IN OBLIGATIONS NOT PAYABLE IN UNITED STATES CURRENCY

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 3(j) applies to shareholders of all funds.

WHAT IS THE PROPOSED CHANGE?

     Upon the approval of Proposal 3(j), the existing fundamental restriction on
investing in obligations not payable in United States currency for each fund
would be eliminated.

                                       28
<PAGE>   32

  Discussion:

     The funds are not required to have fundamental restrictions on investing in
obligations not payable in United States currency. However, as money market
funds, they can only invest in obligations payable as to principal and interest
in United States currency.

WHEN WILL PROPOSALS 3(a) THROUGH 3(j) BE IMPLEMENTED?

     If you approve each of the above proposals, the new fundamental
restrictions will replace the fundamental investment restrictions for all funds.
Accordingly, the proposed fundamental restrictions will become the only
fundamental investment restrictions under which the specified funds will
operate. If approved, the above restrictions may not be changed with respect to
your fund without the approval of the holders of a majority of your fund's
outstanding voting securities (as defined in the 1940 Act). The Board
anticipates that these proposals, if approved, will be implemented on May 30,
2000.

WHAT IS THE BOARD'S RECOMMENDATION ON PROPOSALS 3(a) THROUGH 3(j)?

       -----------------------------------------------------------------
          YOUR BOARD, INCLUDING THE INDEPENDENT TRUSTEES, UNANIMOUSLY
          RECOMMENDS THAT YOU VOTE "FOR" PROPOSALS 3(a) THROUGH 3(j).
       -----------------------------------------------------------------

               PROPOSAL 4:  CHANGING THE INVESTMENT OBJECTIVES OF
                   THE FUNDS SO THAT THEY ARE NON-FUNDAMENTAL

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 4 applies to shareholders of all funds.

WHAT AM I BEING ASKED TO APPROVE?

     The Board recommends that you approve changing your fund's investment
objective so that it is non-fundamental, rather than fundamental. The Board is
asking you to vote on this change because the investment objective of your fund
presently is fundamental and shareholders must approve any change.

     The current investment objective of your fund is in Appendix I. By making
this objective non-fundamental, the Board may change it as it deems appropriate,
without seeking a shareholder vote. The Board does not anticipate changing the
investment objective of your fund at the present time.

     The Board expects that you will benefit from this proposed change because
it will have the ability to respond more quickly to new developments and

                                       29
<PAGE>   33

changing trends in the marketplace without incurring the time and the costs of a
shareholder vote. This should make your fund more competitive among its peers.

     In connection with this proposed change, the name of Treasury TaxAdvantage
Portfolio will be changed to Government TaxAdvantage Portfolio. In addition,
Treasury TaxAdvantage Portfolio will change the manner in which it seeks to
achieve its investment objective by investing not only in direct obligations of
the U.S. Treasury, which include Treasury bills, notes and bonds, but also in
securities issued or guaranteed as to principal and interest by the U.S.
Government or by its agencies or instrumentalities.

WHEN WILL PROPOSAL 4 BE IMPLEMENTED?

     The Board anticipates that Proposal 4, if approved, will be implemented on
May 30, 2000.

WHAT IS THE BOARD'S RECOMMENDATION ON PROPOSAL 4?

       -----------------------------------------------------------------
          YOUR BOARD, INCLUDING THE INDEPENDENT TRUSTEES, UNANIMOUSLY
                 RECOMMENDS THAT YOU VOTE "FOR" THIS PROPOSAL.
       -----------------------------------------------------------------

 PROPOSAL 5:  RATIFICATION OF SELECTION OF KPMG LLP AS INDEPENDENT ACCOUNTANTS

WHICH FUNDS' SHAREHOLDERS WILL VOTE ON THIS PROPOSAL?

     Proposal 5 applies to all shareholders of all funds.

WHAT AM I BEING ASKED TO APPROVE?

     The Board has selected KPMG LLP as independent accountants for each fund
for its fiscal year ending August 31, 2000. As each fund's independent
accountants, KPMG LLP will examine and verify the accounts and securities of
that fund and report on them to the Board and to that fund's shareholders. The
Board's selection will be submitted for your ratification at the meeting.

WHY HAS THE BOARD SELECTED KPMG LLP AS THE INDEPENDENT ACCOUNTANTS?

     KPMG was selected primarily on the basis of its expertise as auditors of
investment companies, its independence from AIM and its affiliates, the quality
of its audit services, and the competitiveness of the fees charged for these
services. KPMG LLP also serves as independent accountants for some of the other
AIM funds.

                                       30
<PAGE>   34

WILL A REPRESENTATIVE FROM KPMG LLP BE AVAILABLE FOR QUESTIONS?

     The Board expects that a representative of KPMG LLP will be present at the
meeting. The representative will have an opportunity to make a statement should
he or she desire to do so and will be available to respond to shareholders'
questions.

WHAT IS THE BOARD'S RECOMMENDATION ON PROPOSAL 5?

       -----------------------------------------------------------------
          YOUR BOARD, INCLUDING THE INDEPENDENT TRUSTEES, UNANIMOUSLY
                 RECOMMENDS THAT YOU VOTE "FOR" THIS PROPOSAL.
       -----------------------------------------------------------------

                              GENERAL INFORMATION

WHO ARE THE EXECUTIVE OFFICERS OF THE TRUST?

     Information about the executive officers of the trust is in Appendix J.

WHAT IS THE SECURITY OWNERSHIP OF MANAGEMENT AND CERTAIN HOLDERS?

     Information about the ownership of each class of each fund's shares by the
trustees and the executive officers of the trust and by 5% holders of each class
is in Appendix K.

WHO ARE THE INVESTMENT ADVISOR, ADMINISTRATOR AND PRINCIPAL UNDERWRITER OF THE
FUNDS?

     A I M Advisors, Inc., whose principal address is 11 Greenway Plaza, Suite
100, Houston, Texas 77046-1173, serves as the investment advisor and
administrator for the funds.

     Fund Management Company, whose principal address is 11 Greenway Plaza,
Suite 100, Houston, Texas 77046-1173, serves as the principal underwriter for
each of the classes of the funds.

HAS THE TRUST HIRED A PROXY SOLICITOR?

     The trust has engaged the services of Shareholder Communications
Corporation (SCC) to assist it in soliciting proxies for the meeting. The trust
estimates that the aggregate cost of SCC's services will be approximately
$[     ]. The trust will bear the cost of soliciting proxies. The trust expects
to solicit proxies principally by mail, but either the trust or SCC may also
solicit proxies by telephone, facsimile or personal interview. The trust may
also reimburse firms and others for their expenses in forwarding solicitation
materials to the beneficial owners of shares of the funds.

                                       31
<PAGE>   35

HOW CAN I SUBMIT A PROPOSAL?

     As a general matter, the funds do not hold regular meetings of
shareholders. If you wish to submit a proposal for consideration at a meeting of
shareholders of a fund, you should send such proposal to the trust at the
address set forth on the first page of this proxy statement. To be considered
for presentation at a shareholders' meeting, the trust must receive proposals a
reasonable time before proxy materials are prepared relating to that meeting.
Your proposal also must comply with applicable law.

                                 OTHER MATTERS

     The Board does not know of any matters to be presented at the meeting other
than those set forth in this proxy statement. If any other business should come
before the meeting, the persons named in the accompanying proxy will vote
thereon in accordance with their best judgment.

                                       32
<PAGE>   36

                                   APPENDIX A

                     SHARES OF SHORT-TERM INVESTMENTS TRUST
                        OUTSTANDING ON FEBRUARY 18, 2000

<TABLE>
<CAPTION>
                                                              NUMBER OF SHARES
                                                               OUTSTANDING ON
NAME OF FUND (CLASS)                                          FEBRUARY 18, 2000
- --------------------                                          -----------------
<S>                                                           <C>
Government & Agency Portfolio
  Cash Management Class.....................................   [        ]
  Institutional Class.......................................   [        ]
  Personal Investment Class.................................   [        ]
  Private Investment Class..................................   [        ]
  Reserve Class.............................................   [        ]
  Resource Class............................................   [        ]

Treasury Portfolio
  Cash Management Class.....................................   [        ]
  Institutional Class.......................................   [        ]
  Personal Investment Class.................................   [        ]
  Private Investment Class..................................   [        ]
  Reserve Class.............................................   [        ]
  Resource Class............................................   [        ]

Treasury TaxAdvantage Portfolio
  Cash Management Class.....................................   [        ]
  Institutional Class.......................................   [        ]
  Personal Investment Class.................................   [        ]
  Private Investment Class..................................   [        ]
  Reserve Class.............................................   [        ]
  Resource Class............................................   [        ]
</TABLE>

                                       A-1
<PAGE>   37

                                   APPENDIX B

                          SHORT-TERM INVESTMENTS TRUST
                 FORM OF MASTER INVESTMENT ADVISORY AGREEMENT

     THIS AGREEMENT is made this           day of           ,           , by and
between Short-Term Investments Trust, a Delaware business trust (the "Trust")
with respect to its series of shares shown on the Appendix A attached hereto, as
the same may be amended from time to time, and A I M Advisors, Inc., a Delaware
corporation (the "Advisor").

                                    RECITALS

     WHEREAS, the Trust is registered under the Investment Company Act of 1940,
as amended (the "l940 Act"), as an open-end, diversified management investment
company;

     WHEREAS, the Advisor is registered under the Investment Advisers Act of
1940, as amended (the "Advisers Act"), as an investment advisor and engages in
the business of acting as an investment advisor;

     WHEREAS, the Trust's Amended and Restated Agreement and Declaration of
Trust (the "Declaration of Trust") authorizes the Board of Trustees of the Trust
(the "Board of Trustees") to create separate series of shares of beneficial
interest in the Trust, and as of the date of this Agreement, the Board of
Trustees has created three separate series portfolios (such portfolios and any
other portfolios hereafter added to the Trust being referred to collectively
herein as the "Funds"); and

     WHEREAS, the Trust and the Advisor desire to enter into an agreement to
provide for investment advisory services to the Funds upon the terms and
conditions hereinafter set forth;

     NOW THEREFORE, in consideration of the mutual covenants herein contained
and other good and valuable consideration, the receipt of which is hereby
acknowledged, the parties agree as follows:

     1. Advisory Services. The Advisor shall act as investment advisor for the
Funds and shall, in such capacity, supervise all aspects of the Funds'
operations, including the investment and reinvestment of cash, securities or
other properties comprising the Funds' assets, subject at all times to the
policies and control of the Board of Trustees. The Advisor shall give the Trust
and the Funds the benefit of its best judgment, efforts and facilities in
rendering its services as investment advisor.

                                       B-1
<PAGE>   38

     2. Investment Analysis and Implementation. In carrying out its obligations
under Section 1 hereof, the Advisor shall:

          (a) supervise all aspects of the operations of the Funds;

          (b) obtain and evaluate pertinent information about significant
     developments and economic, statistical and financial data, domestic,
     foreign or otherwise, whether affecting the economy generally or the Funds,
     and whether concerning the individual issuers whose securities are included
     in the assets of the Funds or the activities in which such issuers engage,
     or with respect to securities which the Advisor considers desirable for
     inclusion in the Funds' assets;

          (c) determine which issuers and securities shall be represented in the
     Funds' investment portfolios and regularly report thereon to the Board of
     Trustees;

          (d) formulate and implement continuing programs for the purchases and
     sales of the securities of such issuers and regularly report thereon to the
     Board of Trustees; and

          (e) take, on behalf of the Trust and the Funds, all actions which
     appear to the Trust and the Funds necessary to carry into effect such
     purchase and sale programs and supervisory functions as aforesaid,
     including but not limited to the placing of orders for the purchase and
     sale of securities for the Funds.

     3. Securities Lending Duties and Fees. The Advisor agrees to provide the
following services in connection with the securities lending activities of each
Fund: (a) oversee participation in the securities lending program to ensure
compliance with all applicable regulatory and investment guidelines; (b) assist
the securities lending agent or principal (the "Agent") in determining which
specific securities are available for loan; (c) monitor the Agent to ensure that
securities loans are effected in accordance with the Advisor's instructions and
with procedures adopted by the Board of Trustees; (d) prepare appropriate
periodic reports for, and seek appropriate approvals from, the Board of Trustees
with respect to securities lending activities; (e) respond to Agent inquiries;
and (f) perform such other duties as necessary.

     As compensation for such services provided by the Advisor in connection
with securities lending activities of each Fund, a lending Fund shall pay the
Advisor a fee equal to 25% of the net monthly interest or fee income retained or
paid to the Fund from such activities.

     4. Delegation of Responsibilities. The Advisor is authorized to delegate
any or all of its rights, duties and obligations under this Agreement to one or
more sub-advisors, and may enter into agreements with sub-advisors, and may
replace any such sub-advisors from time to time in its discretion, in accordance

                                       B-2
<PAGE>   39

with the 1940 Act, the Advisers Act, and rules and regulations thereunder, as
such statutes, rules and regulations are amended from time to time or are
interpreted from time to time by the staff of the Securities and Exchange
Commission ("SEC"), and if applicable, exemptive orders or similar relief
granted by the SEC and upon receipt of approval of such sub-advisors by the
Board of Trustees and by shareholders (unless any such approval is not required
by such statutes, rules, regulations, interpretations, orders or similar
relief).

     5. Independent Contractors. The Advisor and any sub-advisors shall for all
purposes herein be deemed to be independent contractors and shall, unless
otherwise expressly provided or authorized, have no authority to act for or
represent the Trust in any way or otherwise be deemed to be an agent of the
Trust.

     6. Control by Board of Trustees. Any investment program undertaken by the
Advisor pursuant to this Agreement, as well as any other activities undertaken
by the Advisor on behalf of the Funds, shall at all times be subject to any
directives of the Board of Trustees.

     7. Compliance with Applicable Requirements. In carrying out its obligations
under this Agreement, the Advisor shall at all times conform to:

          (a) all applicable provisions of the 1940 Act and the Advisers Act and
     any rules and regulations adopted thereunder;

          (b) the provisions of the registration statement of the Trust, as the
     same may be amended from time to time under the Securities Act of 1933 and
     the 1940 Act;

          (c) the provisions of the Declaration of Trust, as the same may be
     amended from time to time;

          (d) the provisions of the by-laws of the Trust, as the same may be
     amended from time to time; and

          (e) any other applicable provisions of state, federal or foreign law.

     8. Broker-Dealer Relationships. The Advisor is responsible for decisions to
buy and sell securities for the Funds, broker-dealer selection, and negotiation
of brokerage commission rates.

          (a) The Advisor's primary consideration in effecting a security
     transaction will be to obtain the best execution.

          (b) In selecting a broker-dealer to execute each particular
     transaction, the Advisor will take the following into consideration: the
     best net price available; the reliability, integrity and financial
     condition of the broker-dealer; and the value of the expected contribution
     of the broker-dealer to the investment performance of the Funds on a
     continuing basis. Accordingly, the price to the Funds in any transaction
     may be less favorable than that

                                       B-3
<PAGE>   40

     available from another broker-dealer if the difference is reasonably
     justified by other aspects of the fund execution services offered.

          (c) Subject to such policies as the Board of Trustees may from time to
     time determine, the Advisor shall not be deemed to have acted unlawfully or
     to have breached any duty created by this Agreement or otherwise solely by
     reason of its having caused the Funds to pay a broker or dealer that
     provides brokerage and research services to the Advisor an amount of
     commission for effecting a fund investment transaction in excess of the
     amount of commission another broker or dealer would have charged for
     effecting that transaction, if the Advisor determines in good faith that
     such amount of commission was reasonable in relation to the value of the
     brokerage and research services provided by such broker or dealer, viewed
     in terms of either that particular transaction or the Advisor's overall
     responsibilities with respect to a particular Fund, other Funds of the
     Trust, and to other clients of the Advisor as to which the Advisor
     exercises investment discretion. The Advisor is further authorized to
     allocate the orders placed by it on behalf of the Funds to such brokers and
     dealers who also provide research or statistical material, or other
     services to the Funds, to the Advisor, or to any sub-advisor. Such
     allocation shall be in such amounts and proportions as the Advisor shall
     determine and the Advisor will report on said allocations regularly to the
     Board of Trustees indicating the brokers to whom such allocations have been
     made and the basis therefor.

          (d) With respect to one or more Funds, to the extent the Advisor does
     not delegate trading responsibility to one or more sub-advisors, in making
     decisions regarding broker-dealer relationships, the Advisor may take into
     consideration the recommendations of any sub-advisor appointed to provide
     investment research or advisory services in connection with the Funds, and
     may take into consideration any research services provided to such sub-
     advisor by broker-dealers.

          (e) Subject to the other provisions of this Section 8, the 1940 Act,
     the Securities Exchange Act of 1934, and rules and regulations thereunder,
     as such statutes, rules and regulations are amended from time to time or
     are interpreted from time to time by the staff of the SEC, any exemptive
     orders issued by the SEC, and any other applicable provisions of law, the
     Advisor may select brokers or dealers with which it or the Funds are
     affiliated.

     9. Compensation. The compensation that each Fund shall pay the Advisor is
set forth in Appendix B attached hereto.

     10. Expenses of the Funds. All of the ordinary business expenses incurred
in the operations of the Funds and the offering of their shares shall be borne
by the Funds unless specifically provided otherwise in this Agreement. These
expenses borne by the Funds include but are not limited to brokerage
commissions, taxes, legal, accounting, auditing, or governmental fees, the cost
of

                                       B-4
<PAGE>   41

preparing share certificates, custodian, transfer and shareholder service agent
costs, expenses of issue, sale, redemption and repurchase of shares, expenses of
registering and qualifying shares for sale, expenses relating to trustee and
shareholder meetings, the cost of preparing and distributing reports and notices
to shareholders, the fees and other expenses incurred by the Trust on behalf of
the Funds in connection with membership in investment company organizations and
the cost of printing copies of prospectuses and statements of additional
information distributed to the Funds' shareholders.

     11. Services to Other Companies or Accounts. The Trust understands that the
Advisor now acts, will continue to act and may act in the future as investment
manager or advisor to fiduciary and other managed accounts, and as investment
manager or advisor to other investment companies, including any offshore
entities, or accounts, and the Trust has no objection to the Advisor so acting,
provided that whenever the Trust and one or more other investment companies or
accounts managed or advised by the Advisor have available funds for investment,
investments suitable and appropriate for each will be allocated in accordance
with a formula believed to be equitable to each company and account. The Trust
recognizes that in some cases this procedure may adversely affect the size of
the positions obtainable and the prices realized for the Funds.

     12. Non-Exclusivity. The Trust understands that the persons employed by the
Advisor to assist in the performance of the Advisor's duties under this
Agreement will not devote their full time to such service and nothing contained
in this Agreement shall be deemed to limit or restrict the right of the Advisor
or any affiliate of the Advisor to engage in and devote time and attention to
other businesses or to render services of whatever kind or nature. The Trust
further understands and agrees that officers or directors of the Advisor may
serve as officers or trustees of the Trust, and that officers or trustees of
the Trust may serve as officers or directors of the Advisor to the extent
permitted by law; and that the officers and directors of the Advisor are not
prohibited from engaging in any other business activity or from rendering
services to any other person, or from serving as partners, officers, directors
or trustees of any other firm or trust, including other investment advisory
companies.

     13. Effective Date, Term and Approval. This Agreement shall become
effective with respect to a Fund, if approved by the shareholders of such Fund,
on the Effective Date for such Fund, as set forth in Appendix A attached hereto.
If so approved, this Agreement shall thereafter continue in force and effect
until June 30, 2001, and may be continued from year to year thereafter, provided
that the continuation of the Agreement is specifically approved at least
annually:

          (a) (i) by the Board of Trustees or (ii) by the vote of "a majority of
     the outstanding voting securities" of such Fund (as defined in Section
     2(a)(42) of the 1940 Act); and

                                       B-5
<PAGE>   42

          (b) by the affirmative vote of a majority of the trustees who are not
     parties to this Agreement or "interested persons" (as defined in the 1940
     Act) of a party to this Agreement (other than as Trust trustees), by votes
     cast in person at a meeting specifically called for such purpose.

     14. Termination. This Agreement may be terminated as to the Trust or as to
any one or more of the Funds at any time, without the payment of any penalty, by
vote of the Board of Trustees or by vote of a majority of the outstanding voting
securities of the applicable Fund, or by the Advisor, on sixty (60) days'
written notice to the other party. The notice provided for herein may be waived
by the party entitled to receipt thereof. This Agreement shall automatically
terminate in the event of its assignment, the term "assignment" for purposes of
this paragraph having the meaning defined in Section 2(a)(4) of the 1940 Act.

     15. Amendment. No amendment of this Agreement shall be effective unless it
is in writing and signed by the party against which enforcement of the amendment
is sought.

     16. Liability of Advisor and Fund. In the absence of willful misfeasance,
bad faith, gross negligence or reckless disregard of obligations or duties
hereunder on the part of the Advisor or any of its officers, directors or
employees, the Advisor shall not be subject to liability to the Trust or to the
Funds or to any shareholder of the Funds for any act or omission in the course
of, or connected with, rendering services hereunder or for any losses that may
be sustained in the purchase, holding or sale of any security. Any liability of
the Advisor to one Fund shall not automatically impart liability on the part of
the Advisor to any other Fund. No Fund shall be liable for the obligations of
any other Fund.

     17. Liability of Shareholders. Notice is hereby given that, as provided by
applicable law, the obligations of or arising out of this Agreement are not
binding upon any of the shareholders of the Trust individually but are binding
only upon the assets and property of the Trust and that the shareholders shall
be entitled, to the fullest extent permitted by applicable law, to the same
limitation on personal liability as shareholders of private corporations for
profit.

     18. Notices. Any notices under this Agreement shall be in writing,
addressed and delivered, telecopied or mailed postage paid, to the other party
entitled to receipt thereof at such address as such party may designate for the
receipt of such notice. Until further notice to the other party, it is agreed
that the address of the Trust and that of the Advisor shall be 11 Greenway
Plaza, Suite 100, Houston, Texas 77046-1173.

     19. Questions of Interpretation. Any question of interpretation of any term
or provision of this Agreement having a counterpart in or otherwise derived from
a term or provision of the 1940 Act or the Advisers Act shall be resolved by
reference to such term or provision of the 1940 Act or the Advisers Act and to
interpretations thereof, if any, by the United States Courts or in the absence
of any controlling decision of any such court, by rules, regulations or orders
of the

                                       B-6
<PAGE>   43

SEC issued pursuant to said Acts. In addition, where the effect of a requirement
of the 1940 Act or the Advisers Act reflected in any provision of the Agreement
is revised by rule, regulation or order of the SEC, such provision shall be
deemed to incorporate the effect of such rule, regulation or order. Subject to
the foregoing, this Agreement shall be governed by and construed in accordance
with the laws (without reference to conflicts of law provisions) of the State of
Texas.

     20. License Agreement. The Trust shall have the non-exclusive right to use
the name "AIM" to designate any current or future series of shares only so long
as A I M Advisors, Inc. serves as investment manager or advisor to the Trust
with respect to such series of shares.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in duplicate by their respective officers on the day and year first
written above.

<TABLE>
<S>                                      <C>

                                         Short-Term Investments Trust
                                         (a Delaware business trust)
Attest:
                                         By:
- ---------------------------------------
Assistant Secretary                      --------------------------------------
                                             President
(SEAL)
Attest:                                  A I M Advisors, Inc.
- ---------------------------------------  By:
Assistant Secretary
                                         --------------------------------------
(SEAL)                                       President
</TABLE>

                                       B-7
<PAGE>   44

                                   Appendix A

                           FUNDS AND EFFECTIVE DATES

<TABLE>
<CAPTION>
                                                      EFFECTIVE DATE OF
NAME OF FUND                                          ADVISORY AGREEMENT
- ------------                                          ------------------
<S>                                                   <C>
Government & Agency Portfolio.......................   May 30, 2000
Treasury Portfolio..................................   May 30, 2000
Treasury TaxAdvantage Portfolio.....................   May 30, 2000
</TABLE>

                                       B-8
<PAGE>   45

                                   Appendix B

                          COMPENSATION TO THE ADVISOR

     The Trust shall pay the Advisor, out of the assets of a Fund, as full
compensation for all services rendered, an advisory fee for such Fund set forth
below. Such fee shall be calculated by applying the following annual rates to
the average daily net assets of such Fund for the calendar year computed in the
manner used for the determination of the net asset value of shares of such Fund.

                         GOVERNMENT & AGENCY PORTFOLIO

<TABLE>
<CAPTION>
                   NET ASSETS                      ANNUAL RATE
                   ----------                      -----------
<S>                                                <C>
All net assets...................................     0.10%
</TABLE>

                               TREASURY PORTFOLIO

<TABLE>
<CAPTION>
                   NET ASSETS                      ANNUAL RATE
                   ----------                      -----------
<S>                                                <C>
First $300 million...............................     0.15%
Over $300 million up to and including $1.5
  billion........................................     0.06%
Amount over $1.5 billion.........................     0.05%
</TABLE>

                        TREASURY TAXADVANTAGE PORTFOLIO

<TABLE>
<CAPTION>
                   NET ASSETS                      ANNUAL RATE
                   ----------                      -----------
<S>                                                <C>
First $250 million...............................     0.20%
Over $250 million up to and including $500
  million........................................     0.15%
Amount over $500 million.........................     0.10%
</TABLE>

                                       B-9
<PAGE>   46

                                   APPENDIX C

                          DATES OF ADVISORY AGREEMENTS

<TABLE>
<CAPTION>
                         DATE OF CURRENT        DATE LAST SUBMITTED       DATE AIM BECAME
    NAME OF FUND       ADVISORY AGREEMENT    TO A VOTE OF SHAREHOLDERS   INVESTMENT ADVISOR
    ------------       ------------------    -------------------------   ------------------
<S>                    <C>                   <C>                         <C>
Government & Agency    February 28, 1997,      August 31, 1998*          September 1, 1998
Portfolio              as amended
                       September 1, 1998

Treasury Portfolio     February 28, 1997,      February 7, 1997**        December 31, 1986
                       as amended
                       September 1, 1998

Treasury Tax           February 28, 1997,      February 7, 1997**        August 30, 1990
Advantage Portfolio    as amended
                       September 1, 1998
</TABLE>

 *  The current advisory agreement was submitted to a vote of the initial
    shareholder of the fund prior to the commencement of operations.

**  The current advisory agreement was last submitted to a vote of public
    shareholders of the fund in connection with a merger between A I M
    Management Group Inc. and a subsidiary of INVESCO PLC.

                                       C-1
<PAGE>   47

                                   APPENDIX D

            EXECUTIVE OFFICERS AND DIRECTORS OF A I M ADVISORS, INC.

     The following table provides information with respect to the principal
executive officer and the directors of A I M Advisors, Inc., all of whose
business address is 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173.

<TABLE>
<CAPTION>
NAME AND ADDRESS           POSITION WITH AIM           PRINCIPAL OCCUPATION
- ----------------           -----------------           --------------------
<S>                        <C>                         <C>
Charles T. Bauer           Director and Chairman       See trustee table under Proposal 1

Gary T. Crum               Director and Senior Vice    See Appendix J
                           President

Robert H. Graham           Director and President      See trustee table under Proposal 1

Dawn M. Hawley             Director, Senior Vice       Senior Vice President, Chief
                           President and Treasurer     Financial Officer and Treasurer,
                                                       A I M Management Group Inc.; and
                                                       Vice President and Treasurer, A I M
                                                       Capital Management, Inc., A I M
                                                       Distributors, Inc., A I M Fund
                                                       Services, Inc., and Fund
                                                       Management Company.

Carol F. Relihan           Director, Senior Vice       See Appendix J
                           President, General
                           Counsel and Secretary
</TABLE>

                                       D-1
<PAGE>   48

                                   APPENDIX E

                        ADVISORY AGREEMENT FEE SCHEDULE

<TABLE>
<CAPTION>
                                                                 AGGREGATE NET FEES
                                                                    PAID TO AIM
                                          TOTAL NET ASSETS FOR        FOR THE         FEE WAIVERS FOR THE
                          ANNUAL RATE      THE MOST RECENTLY       MOST RECENTLY         MOST RECENTLY
                       (BASED ON AVERAGE    COMPLETED FISCAL      COMPLETED FISCAL     COMPLETED FISCAL
NAME OF FUND           DAILY NET ASSETS)     PERIOD OR YEAR        PERIOD OR YEAR       PERIOD OR YEAR
- ------------           -----------------  --------------------   ------------------   -------------------
<S>                    <C>                <C>                    <C>                  <C>
Government & Agency    0.10%                 $ 279,185,112                 -0-            $ 232,200
Portfolio

Treasury Portfolio     0.15% of first        5,203,747,106         $ 3,072,316                  -0-
                       $300 million;
                       0.06% over $300
                       million up to
                       $1.5 billion;
                       0.05% of the
                       excess over $1.5
                       billion

Treasury TaxAdvantage  0.20% of the            133,893,290              50,808              244,182
Portfolio              first $250
                       million; 0.15%
                       over $250 million
                       up to $500
                       million; 0.10% of
                       the excess over
                       $500 million
</TABLE>

                                       E-1
<PAGE>   49

                                   APPENDIX F

                        FEES PAID TO AIM AND AFFILIATES
                           IN MOST RECENT FISCAL YEAR

     The following chart sets forth the fees paid during the fiscal period or
year ended August 31, 1999 by the trust to A I M Advisors, Inc. ("AIM") for
administrative services and to affiliates of AIM. The administrative and other
services currently provided by AIM and its affiliates will continue to be
provided after the investment advisory contract with AIM is approved.

<TABLE>
<CAPTION>
                                                 AIM            FUND
                                           (ADMINISTRATIVE   MANAGEMENT     A I M FUND
                                              SERVICES)       COMPANY     SERVICES, INC.
                                           ---------------   ----------   --------------
<S>                                        <C>               <C>          <C>
SHORT-TERM INVESTMENTS TRUST
  Government & Agency Portfolio..........     $ 58,583        $      0       $ 22,907
  Treasury Portfolio.....................      179,471         458,025        477,417
  Treasury TaxAdvantage Portfolio........       51,944               0         14,110
</TABLE>

                                       F-1
<PAGE>   50

                                   APPENDIX G

                   ADVISORY FEE SCHEDULES FOR OTHER AIM FUNDS

     The following table provides information with respect to the annual
advisory fee rates paid to by certain funds that have the same investment
objective as Government & Agency Portfolio, Treasury Portfolio and Treasury Tax
Advantage Portfolio.


<TABLE>
<CAPTION>
                                                                                             FEE WAIVERS,
                                         ANNUAL RATE              TOTAL NET ASSETS FOR    EXPENSE CAPS AND/OR
                                      (BASED ON AVERAGE             THE MOST RECENTLY           EXPENSE
NAME OF FUND                          DAILY NET ASSETS)           COMPLETED FISCAL YEAR     REIMBURSEMENTS
- ------------                          -----------------           ---------------------   -------------------
<S>                           <C>                                 <C>                     <C>
AIM Money Market Fund.......  0.55% of the first $1 billion;         $1,451,025,249
                              0.50% of the excess over $1
                              billion

Liquid Assets Portfolio.....  0.15% of the average daily net         $6,194,495,351
                              assets of the Portfolio

Prime Portfolio.............  0.20% of the first $100 million;       $8,724,224,691
                              0.15% over $100 million up to $200
                              million; 0.10% over $200 million up
                              to $300 million 0.06%; over $300
                              million up to $1.5 billion; 0.05%
                              over $1.5 billion

AIM V.I. Money Market Fund..  0.40% of first $250 million; 0.35%     $   95,152,169
                              of excess over $250 million


</TABLE>

                                       G-1
<PAGE>   51

                                   APPENDIX H

                  CURRENT FUNDAMENTAL INVESTMENT RESTRICTIONS

GOVERNMENT & AGENCY PORTFOLIO

     Government & Agency may not:

          (1) purchase the securities of any issuer if, as a result, the
     Portfolio would fail to be a diversified company within the meaning of the
     1940 Act, the rules and regulations promulgated thereunder, as such
     statute, rules and regulations are amended from time to time; provided,
     however, that the Portfolio may purchase securities of other investment
     companies to the extent permitted by the 1940 Act and the rules and
     regulations promulgated thereunder (as such statute, rules and regulations
     are amended from time to time) or to the extent permitted by exemptive
     order or other similar relief;

          (2) concentrate 25% or more of its total assets in the securities of
     issuers in a particular industry; provided, however, that securities issued
     or guaranteed by banks or subject to financial guaranty insurance are not
     subject to this limitation; and provided further, that securities issued or
     guaranteed by the U.S. Government, its agencies and instrumentalities are
     not included within this restriction;

          (3) borrow money or issue senior securities except (a) for temporary
     or emergency purposes (e.g., in order to facilitate the orderly sale of
     portfolio securities or accommodate abnormally heavy redemption requests),
     the Portfolio may borrow money from banks, and (b) to the extent that
     entering into commitments to purchase securities in accordance with the
     Portfolio's investment program may be considered the issuance of senior
     securities, provided that the Portfolio will not purchase portfolio
     securities while borrowings in excess of 5% of its total assets are
     outstanding;

          (4) mortgage, pledge or hypothecate any assets except to secure
     permitted borrowings and then only in an amount up to 33 1/3% of the value
     of its total assets at the time of borrowing;

          (5) make loans of money or securities other than (a) through the
     purchase of debt securities in accordance with the Portfolio's investment
     program, and (b) by entering into repurchase agreements;

          (6) underwrite securities issued by any other person, except to the
     extent that the purchase of securities and the later disposition of such
     securities in accordance with the Portfolio's investment program may be
     deemed an underwriting;

          (7) invest in real estate, except that the Portfolio may purchase and
     sell securities secured by real estate or interests therein or issued by
     issuers which invest in real estate or interests therein;

                                       H-1
<PAGE>   52

          (8) purchase or sell commodities or commodity futures contracts,
     purchase securities on margin, make short sales or invest in puts or calls;
     or

          (9) invest in any obligation not payable as to principal and interest
     in United States currency.

TREASURY PORTFOLIO

     Treasury may not:

          (1) concentrate more than 25% of the value of its total assets in the
     securities of one or more issuers conducting their principal business
     activities in the same industry, provided that there is no limitation with
     respect to investments in obligations issued or guaranteed by the U.S.
     Government, its agencies or instrumentalities and bank instruments, such as
     CDs, bankers' acceptances, time deposits and bank repurchase agreements;

          (2) purchase securities of any one issuer (other than obligations of
     the U.S. Government, its agencies or instrumentalities) if, immediately
     after such purchase, more than 5% of the value of the Portfolio's total
     assets would be invested in such issuer, except as permitted by Rule 2a-7
     under the 1940 Act, as amended from time to time, and except that the
     Portfolio may purchase securities of other investment companies to the
     extent permitted by applicable law or exemptive order;

          (3) borrow money or issue senior securities except (a) for temporary
     or emergency purposes (e.g., in order to facilitate the orderly sale of
     portfolio securities or to accommodate abnormally heavy redemption
     requests), the Portfolio may borrow money from banks or obtain funds by
     entering into reverse repurchase agreements, and (b) to the extent that
     entering into commitments to purchase securities in accordance with the
     Portfolio's investment program may be considered the issuance of senior
     securities, provided that the Portfolio will not purchase portfolio
     securities while borrowings in excess of 5% of its total assets are
     outstanding;

          (4) mortgage, pledge, or hypothecate any assets except to secure
     permitted borrowings and except for reverse repurchase agreements and then
     only in an amount up to 33 1/3% of the value of its total assets at the
     time of borrowing or entering into a reverse repurchase agreement;

          (5) make loans of money or securities other than (a) through the
     purchase of debt securities in accordance with the Portfolio's investment
     program, (b) by entering into repurchase agreements and (c) by lending
     portfolio securities to the extent permitted by law or regulation;

          (6) underwrite securities issued by any other person, except to the
     extent that the purchase of securities and the later disposition of such
     securities in accordance with the Portfolio's investment program may be
     deemed an underwriting;

                                       H-2
<PAGE>   53

          (7) invest in real estate, except that the Portfolio may purchase and
     sell securities secured by real estate or interests therein or issued by
     issuers which invest in real estate or interests therein;

          (8) purchase or sell commodities or commodity futures contracts,
     purchase securities on margin, make short sales or invest in puts or calls;
     or

          (9) invest in any obligation not payable as to principal and interest
     in United States currency.

TREASURY TAXADVANTAGE PORTFOLIO

     Treasury TaxAdvantage may not:

          (1) concentrate more than 25% of the value of its total assets in the
     securities of one or more issuers conducting their principal business
     activities in the same industry, provided that there is no limitation with
     respect to investments in obligations issued or guaranteed by the U.S.
     Government, its agencies or instrumentalities and bank instruments, such as
     CDs, bankers' acceptances, time deposits and bank repurchase agreements;

          (2) borrow money or issue senior securities except (a) for temporary
     or emergency purposes (e.g., in order to facilitate the orderly sale of
     portfolio securities or to accommodate abnormally heavy redemption
     requests), the Portfolio may borrow money from banks or obtain funds by
     entering into reverse repurchase agreements, and (b) to the extent that
     entering into commitments to purchase securities in accordance with the
     Portfolio's investment program may be considered the issuance of senior
     securities, provided that the Portfolio will not purchase portfolio
     securities while borrowings in excess of 5% of its total assets are
     outstanding;

          (3) mortgage, pledge or hypothecate any assets except to secure
     permitted borrowings and except for reverse repurchase agreements and then
     only in an amount up to 33 1/3% of the value of its total assets at the
     time of borrowing or entering into a reverse repurchase agreement;

          (4) make loans of money or securities other than (a) through the
     purchase of debt securities in accordance with the Portfolio's investment
     program, (b) by entering into repurchase agreements and (c) by lending
     portfolio securities to the extent permitted by law or regulation;

          (5) underwrite securities issued by any other person, except to the
     extent that the purchase of securities and the later disposition of such
     securities in accordance with the Portfolio's investment program may be
     deemed an underwriting;

          (6) invest in real estate, except that the Portfolio may purchase and
     sell securities secured by real estate or interests therein or issued by
     issuers which invest in real estate or interests therein;

                                       H-3
<PAGE>   54

          (7) purchase or sell commodities or commodity futures contracts,
     purchase securities on margin, make short sales or invest in puts or calls;
     or

          (8) invest in any obligation not payable as to principal and interest
     in United States currency.

                                       H-4
<PAGE>   55

                                   APPENDIX I

                         CURRENT INVESTMENT OBJECTIVES

GOVERNMENT & AGENCY PORTFOLIO, TREASURY PORTFOLIO AND TREASURY
TAXADVANTAGE PORTFOLIO

     The fund's investment objective is to maximize current income consistent
with the preservation of capital and maintenance of liquidity.

                                       I-1
<PAGE>   56

                                   APPENDIX J

               EXECUTIVE OFFICERS OF SHORT-TERM INVESTMENTS TRUST

     The following table provides information with respect to the executive
officers of the trust. Each executive officer is elected by the Board and serves
until his or her successor is chosen and qualified or until his or her
resignation or removal by the Board. The business address of all officers of the
trust is 11 Greenway Plaza, Suite 100, Houston, Texas 77046-1173.

<TABLE>
<CAPTION>
NAME, AGE AND POSITION                                    PRINCIPAL OCCUPATION(S)
WITH THE TRUST                  OFFICER SINCE               DURING PAST 5 YEARS
- ----------------------          -------------             -----------------------
<S>                           <C>                  <C>
Charles T. Bauer (81),        May 5, 1993          See trustee table under Proposal 1
Chairman

Robert H. Graham (53),        January 1, 1994      See trustee table under Proposal 1
President

Gary T. Crum (52),            September 11, 1993   Director and President, A I M Capital
Senior Vice President                              Management, Inc.; Director and
                                                   Executive Vice President, A I M
                                                   Management Group Inc.; Director and
                                                   Senior Vice President, A I M Advisors,
                                                   Inc.; and Director, A I M
                                                   Distributors, Inc. and AMVESCAP PLC.

Carol F. Relihan (45),        August 4, 1994       Director, Senior Vice President,
Senior Vice President and                          General Counsel and Secretary, A I M
Secretary                                          Advisors, Inc.; Senior Vice President,
                                                   General Counsel and Secretary, A I M
                                                   Management Group Inc.; Director, Vice
                                                   President and General Counsel, Fund
                                                   Management Company; Vice President and
                                                   General Counsel, A I M Fund Services,
                                                   Inc; and Vice President, A I M Capital
                                                   Management, Inc. and A I M
                                                   Distributors, Inc.

Melville B. Cox (56),         September 11, 1993   Vice President and Chief Compliance
Vice President                                     Officer, A I M Advisors, Inc., A I M
                                                   Capital Management, Inc., A I M
                                                   Distributors, Inc., A I M Fund
                                                   Services, Inc. and Fund Management
                                                   Company

Dana R. Sutton (41),          September 11, 1993   Vice President and Fund Controller,
Vice President and Treasurer                       A I M Advisors, Inc.; and Assistant
                                                   Vice President and Assistant
                                                   Treasurer, Fund Management Company.

Karen Dunn Kelley (39),       September 11, 1993   Senior Vice President, A I M Capital
Vice President                                     Management, Inc. and Vice President,
                                                   A I M Advisors, Inc.

J. Abbott Sprague (45),       September 11, 1993   Director and President, Fund
Vice President                                     Management Company; Director, A I M
                                                   Fund Services, Inc. and Senior Vice
                                                   President, A I M Advisors, Inc. and
                                                   A I M Management Group Inc.
</TABLE>

                                       J-1
<PAGE>   57

                                   APPENDIX K

              SECURITY OWNERSHIP OF CERTAIN OWNERS AND MANAGEMENT

SECURITY OWNERSHIP OF MANAGEMENT

     The following table sets forth certain information regarding the ownership
of the shares of beneficial interest of each of the funds by the trustees and
executive officers of the trust. No information is given as to a fund or a class
if a trustee or officer held no shares of any or all classes of such fund as of
February 18, 2000.

<TABLE>
<CAPTION>
                                                              SHARES OWNED   PERCENT
          NAME OF DIRECTOR/OFFICER             FUND (CLASS)   BENEFICIALLY   OF CLASS
          ------------------------             ------------   ------------   --------
<S>                                            <C>            <C>            <C>
Charles T. Bauer.............................
Bruce L. Crockett............................
Owen Daly II.................................
Edward K. Dunn Jr. ..........................
Jack M. Fields...............................
Carl Frischling..............................
Robert H. Graham.............................
Prema Mathai-Davis...........................
Lewis F. Pennock.............................
Louis S. Sklar...............................
Gary T. Crum.................................
Carol F. Relihan.............................
Melville B. Cox..............................
Dana R. Sutton...............................
Karen Dunn Kelley............................
J. Abbott Sprague............................
All Trustees and Officers as a Group.........
</TABLE>

*  Less than 1% of the outstanding shares of the class.

                                       K-1
<PAGE>   58

SECURITY OWNERSHIP OF CERTAIN RECORD OWNERS

     To the best knowledge the trust, the names and addresses of the holders of
5% or more of the outstanding shares of each of the funds as of February 18,
2000, and the amount of the outstanding shares owned of record or beneficially
by such holders, are set forth below.

<TABLE>
<CAPTION>
                                                                PERCENT OF     PERCENT OF
                                                 SHARES            CLASS          CLASS
                         NAME AND ADDRESS         OWNED            OWNED          OWNED
                         OF RECORD OWNER        OF RECORD       OF RECORD*    BENEFICIALLY*
                         ----------------       ---------       ----------    -------------
<S>                      <C>                <C>                 <C>           <C>
</TABLE>

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

* The trust has no knowledge as to whether any portion or all of the shares
  owned of record are also owned beneficially.

                                       K-2
<PAGE>   59
                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!

                     PLEASE SIGN, DATE AND RETURN YOUR PROXY
                                     TODAY!


                  Please detach at perforation before mailing.


 ...............................................................................
PROXY                                                                     PROXY


                          PROXY SOLICITED BY THE BOARD
                        OF GOVERNMENT & AGENCY PORTFOLIO
        PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE HELD MAY 3, 2000


The undersigned hereby appoints Robert H. Graham and Gary T. Crum, and each of
them separately, proxies with the power of substitution to each, and hereby
authorizes them to represent and to vote, as designated below, at the Special
Meeting of Shareholders of Government & Agency Portfolio, a portfolio of
Short-Term Investments Trust, on May 3, 2000, at 3:00 p.m., Central time, and at
any adjournment thereof, all of the shares of Government & Agency Portfolio
which the undersigned would be entitled to vote if personally present. IF THIS
PROXY IS SIGNED AND RETURNED WITH NO CHOICES INDICATED, THE SHARES WILL BE VOTED
"FOR" EACH TRUSTEE AND "FOR" THE APPROVAL OF EACH OTHER PROPOSAL.

     CONTROL NUMBER:

                           NOTE: PLEASE SIGN EXACTLY AS YOUR NAME APPEARS ON
                           THIS PROXY CARD. All joint owners should sign. When
                           signing as executor, administrator, attorney, trustee
                           or guardian or as custodian for a minor, please give
                           full title as such. If a corporation, please sign in
                           full corporate name and indicate the signer's office.
                           If a partner, sign in the partnership name.


                           ----------------------------------------------------
                           Signature


                           ----------------------------------------------------
                           Signature  (if held jointly)


                           Dated
                                -----------------------------------



<PAGE>   60



                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!

                     PLEASE SIGN, DATE AND RETURN YOUR PROXY
                                     TODAY!

                  Please detach at perforation before mailing.
 ...............................................................................


         THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES. THE TRUSTEES
         RECOMMEND VOTING "FOR" EACH PROPOSAL.

         TO VOTE, FILL IN BOX COMPLETELY.  EXAMPLE:  [X]

         IF YOU DO NOT WISH YOUR SHARES VOTED "FOR" A PARTICULAR NOMINEE, MARK
         THE "FOR ALL EXCEPT" BOX AND STRIKE A LINE THROUGH THE NOMINEE(S)'
         NAME. YOUR SHARES WILL BE VOTED "FOR" THE REMAINING NOMINEE(S).


1.       To elect ten individuals to the Board of Trustees of Short-Term
         Investments Trust, each of whom will serve until his or her successor
         is elected and qualified:

               FOR                      WITHHOLD          FOR ALL EXCEPT
                                        AUTHORITY
                                        FOR ALL
                                        NOMINEES
               [  ]                       [  ]                [  ]

               Charles T. Bauer                           Carl Frischling
               Bruce L. Crockett                          Robert H. Graham
               Owen Daly II                               Prema Mathai-Davis
               Edward K. Dunn Jr.                         Lewis F. Pennock
               Jack M. Fields                             Louis S. Sklar

2.       To approve a new Master Investment Advisory Agreement with A I M
         Advisors, Inc.

               FOR                      AGAINST           ABSTAIN

               [  ]                      [  ]               [  ]

3.       To approve a proposal to change Government & Agency Portfolio's
         fundamental investment restrictions.

                                                  FOR       AGAINST   ABSTAIN

         (a)  Change to or Addition of
         Fundamental Restriction on Issuer
         Diversification                          [  ]        [  ]     [  ]

         (b)  Change to the Fundamental
         Restriction on Borrowing Money and
         Issuing Senior Securities                [  ]        [  ]     [  ]

         (c)  Change to the Fundamental
         Restriction on Underwriting Securities   [  ]        [  ]     [  ]

         (d)  Change to the Fundamental
         Restriction on Industry Concentration    [  ]        [  ]     [  ]

<PAGE>   61
         (e)  Change to the Fundamental
         Restriction on Purchasing or Selling
         Real Estate                              [  ]        [  ]     [  ]

         (f)  Change to the Fundamental
         Restriction on Purchasing or Selling
         Commodities, Margin Transactions,
         Short Sales of Securities and Investing
         in Puts or Calls                         [  ]        [  ]     [  ]

         (g)  Change to the Fundamental
         Restriction on Making Loans              [  ]        [  ]     [  ]

         (h)  Approval of a New Fundamental
         Investment Restriction on Investing All
         of Each Fund's Assets in an Open-End
         Fund                                     [  ]        [  ]     [  ]

         (i)  Elimination of Fundamental
         Restriction on Mortgaging or Pledging
         Assets                                   [  ]        [  ]     [  ]

         (j)  Elimination of Fundamental
         Restriction on Investing in Obligations
         Not Payable in United States Currency    [  ]        [  ]     [  ]

4.       To approve a proposal to change the investment objective of Government
         & Agency Portfolio so that it is non-fundamental.

               FOR                      AGAINST           ABSTAIN

               [  ]                      [  ]              [  ]

5.       To ratify the selection of KPMG LLP as independent accountants of
         Government & Agency Portfolio for the fiscal year ending in 2000.

               FOR                      AGAINST           ABSTAIN

               [  ]                      [  ]              [  ]

6.       In the discretion of such proxies, upon such other business as may
         properly come before the meeting or any adjournment thereof.


<PAGE>   62
                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!

                     PLEASE SIGN, DATE AND RETURN YOUR PROXY
                                     TODAY!


                  Please detach at perforation before mailing.


 ...............................................................................
PROXY                                                                     PROXY


                          PROXY SOLICITED BY THE BOARD
                              OF TREASURY PORTFOLIO
        PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE HELD MAY 3, 2000


The undersigned hereby appoints Robert H. Graham and Gary T. Crum, and each of
them separately, proxies with the power of substitution to each, and hereby
authorizes them to represent and to vote, as designated below, at the Special
Meeting of Shareholders of Treasury Portfolio, a portfolio of Short-Term
Investments Trust, on May 3, 2000, at 3:00 p.m., Central time, and at any
adjournment thereof, all of the shares of Treasury Portfolio which the
undersigned would be entitled to vote if personally present. IF THIS PROXY IS
SIGNED AND RETURNED WITH NO CHOICES INDICATED, THE SHARES WILL BE VOTED "FOR"
EACH TRUSTEE AND "FOR" THE APPROVAL OF EACH OTHER PROPOSAL.

         CONTROL NUMBER:

                           NOTE: PLEASE SIGN EXACTLY AS YOUR NAME APPEARS ON
                           THIS PROXY CARD. All joint owners should sign. When
                           signing as executor, administrator, attorney, trustee
                           or guardian or as custodian for a minor, please give
                           full title as such. If a corporation, please sign in
                           full corporate name and indicate the signer's office.
                           If a partner, sign in the partnership name.


                           ----------------------------------------------------
                           Signature


                           ----------------------------------------------------
                           Signature  (if held jointly)


                           Dated
                                ---------------------------------------



<PAGE>   63



                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!

                     PLEASE SIGN, DATE AND RETURN YOUR PROXY
                                     TODAY!

                  Please detach at perforation before mailing.
 ...............................................................................


         THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES.  THE TRUSTEES
         RECOMMEND VOTING "FOR" EACH PROPOSAL.

         TO VOTE, FILL IN BOX COMPLETELY.  EXAMPLE:  [X]

         IF YOU DO NOT WISH YOUR SHARES VOTED "FOR" A PARTICULAR NOMINEE, MARK
         THE "FOR ALL EXCEPT" BOX AND STRIKE A LINE THROUGH THE NOMINEE(S)'
         NAME. YOUR SHARES WILL BE VOTED "FOR" THE REMAINING NOMINEE(S).


1.       To elect ten individuals to the Board of Trustees of Short-Term
         Investments Trust, each of whom will serve until his or her successor
         is elected and qualified:

               FOR                      WITHHOLD          FOR ALL EXCEPT
                                        AUTHORITY
                                        FOR ALL
                                        NOMINEES
               [  ]                       [  ]                [  ]

               Charles T. Bauer                           Carl Frischling
               Bruce L. Crockett                          Robert H. Graham
               Owen Daly II                               Prema Mathai-Davis
               Edward K. Dunn Jr.                         Lewis F. Pennock
               Jack M. Fields                             Louis S. Sklar



2.       To approve a new Master Investment Advisory Agreement with A I M
         Advisors, Inc.

               FOR                       AGAINST              ABSTAIN

               [  ]                       [  ]                 [  ]

3.       To approve a proposal to change Treasury Portfolio's fundamental
         investment restrictions.

                                                  FOR      AGAINST     ABSTAIN

         (a)  Change to or Addition of
         Fundamental Restriction on Issuer
         Diversification                          [  ]       [  ]      [  ]

         (b)  Change to the Fundamental
         Restriction on Borrowing Money and
         Issuing Senior Securities                [  ]       [  ]      [  ]

         (c)  Change to the Fundamental
         Restriction on Underwriting Securities   [  ]       [  ]      [  ]

         (d)  Change to the Fundamental
         Restriction on Industry Concentration    [  ]       [  ]      [  ]

<PAGE>   64
         (e)  Change to the Fundamental
         Restriction on Purchasing or Selling
         Real Estate                              [  ]        [  ]     [  ]

         (f)  Change to the Fundamental
         Restriction on Purchasing or Selling
         Commodities, Margin Transactions,
         Short Sales of Securities and Investing
         in Puts or Calls                         [  ]        [  ]     [  ]

         (g)  Change to the Fundamental
         Restriction on Making Loans              [  ]        [  ]     [  ]

         (h)  Approval of a New Fundamental
         Investment Restriction on Investing All
         of Each Fund's Assets in an Open-End
         Fund                                     [  ]        [  ]     [  ]

         (i)  Elimination of Fundamental
         Restriction on Mortgaging or Pledging
         Assets                                   [  ]        [  ]     [  ]

         (j)  Elimination of Fundamental
         Restriction on Investing in Obligations
         Not Payable in United States Currency    [  ]        [  ]     [  ]

4.       To approve a proposal to change the investment objective of Treasury
         Portfolio so that it is non-fundamental.

               FOR                       AGAINST             ABSTAIN

               [  ]                       [  ]                [  ]


5.       To ratify the selection of KPMG LLP as independent accountants of
         Treasury Portfolio for the fiscal year ending in 2000.

               FOR                       AGAINST              ABSTAIN

               [  ]                       [  ]                 [  ]

6.       In the discretion of such proxies, upon such other business as may
         properly come before the meeting or any adjournment thereof.


<PAGE>   65
                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!

                     PLEASE SIGN, DATE AND RETURN YOUR PROXY
                                     TODAY!


                  Please detach at perforation before mailing.


 ...............................................................................
PROXY                                                                     PROXY


                          PROXY SOLICITED BY THE BOARD
                       OF TREASURY TAXADVANTAGE PORTFOLIO
        PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE HELD MAY 3, 2000


The undersigned hereby appoints Robert H. Graham and Gary T. Crum, and each of
them separately, proxies with the power of substitution to each, and hereby
authorizes them to represent and to vote, as designated below, at the Special
Meeting of Shareholders of Treasury TaxAdvantage Portfolio, a portfolio of
Short-Term Investments Trust, on May 3, 2000, at 3:00 p.m., Central time, and at
any adjournment thereof, all of the shares of Treasury TaxAdvantage Portfolio
which the undersigned would be entitled to vote if personally present. IF THIS
PROXY IS SIGNED AND RETURNED WITH NO CHOICES INDICATED, THE SHARES WILL BE VOTED
"FOR" EACH TRUSTEE AND "FOR" THE APPROVAL OF EACH OTHER PROPOSAL.

         CONTROL NUMBER:
                           NOTE: PLEASE SIGN EXACTLY AS YOUR NAME APPEARS ON
                           THIS PROXY CARD. All joint owners should sign. When
                           signing as executor, administrator, attorney, trustee
                           or guardian or as custodian for a minor, please give
                           full title as such. If a corporation, please sign in
                           full corporate name and indicate the signer's office.
                           If a partner, sign in the partnership name.


                           ----------------------------------------------------
                           Signature


                           ----------------------------------------------------
                           Signature  (if held jointly)


                           Dated
                                 ------------------------------------



<PAGE>   66

                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!

                     PLEASE SIGN, DATE AND RETURN YOUR PROXY
                                     TODAY!

                  Please detach at perforation before mailing.
 ...............................................................................


         THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES.  THE TRUSTEES
         RECOMMEND VOTING "FOR" EACH PROPOSAL.

         TO VOTE, FILL IN BOX COMPLETELY.  EXAMPLE:  [X]

         IF YOU DO NOT WISH YOUR SHARES VOTED "FOR" A PARTICULAR NOMINEE, MARK
         THE "FOR ALL EXCEPT" BOX AND STRIKE A LINE THROUGH THE NOMINEE(S)'
         NAME. YOUR SHARES WILL BE VOTED "FOR" THE REMAINING NOMINEE(S).


1.       To elect ten individuals to the Board of Trustees of Short-Term
         Investments Trust, each of whom will serve until his or her successor
         is elected and qualified:

               FOR                      WITHHOLD          FOR ALL EXCEPT
                                        AUTHORITY
                                        FOR ALL
                                        NOMINEES
               [  ]                       [  ]                [  ]

               Charles T. Bauer                           Carl Frischling
               Bruce L. Crockett                          Robert H. Graham
               Owen Daly II                               Prema Mathai-Davis
               Edward K. Dunn Jr.                         Lewis F. Pennock
               Jack M. Fields                             Louis S. Sklar

2.       To approve a new Master Investment Advisory Agreement with A I M
         Advisors, Inc.

               FOR                       AGAINST              ABSTAIN

               [  ]                       [  ]                 [  ]

3.       To approve a proposal to change Treasury TaxAdvantage Portfolio's
         fundamental investment restrictions.

                                                  FOR    AGAINST    ABSTAIN

          (a)  Change to or Addition of
          Fundamental Restriction on Issuer
          Diversification                         [  ]      [  ]     [  ]

          (b)  Change to the Fundamental
          Restriction on Borrowing Money and
          Issuing Senior Securities               [  ]      [  ]     [  ]

          (c)  Change to the Fundamental
          Restriction on Underwriting Securities  [  ]      [  ]     [  ]

          (d)  Change to the Fundamental
          Restriction on Industry Concentration   [  ]      [  ]     [  ]

<PAGE>   67

          (e)  Change to the Fundamental
          Restriction on Purchasing or Selling
          Real Estate                             [  ]        [  ]     [  ]

          (f)  Change to the Fundamental
          Restriction on Purchasing or Selling
          Commodities, Margin Transactions, Short
          Sales of Securities and Investing in
          Puts or Calls                           [  ]        [  ]     [  ]

          (g)  Change to the Fundamental
          Restriction on Making Loans             [  ]        [  ]     [  ]

          (h)  Approval of a New Fundamental
          Investment Restriction on Investing All
          of Each Fund's Assets in an Open-End
          Fund                                    [  ]        [  ]     [  ]

          (i)  Elimination of Fundamental
          Restriction on Mortgaging or Pledging
          Assets                                  [  ]        [  ]     [  ]

          (j)  Elimination of Fundamental
          Restriction on Investing in
          Obligations Not Payable in United
          States Currency                         [  ]        [  ]     [  ]

4.       To approve a proposal to change the investment objective of Treasury
         TaxAdvantage Portfolio so that it is non-fundamental.

               FOR                       AGAINST              ABSTAIN

               [  ]                       [  ]                 [  ]

5.       To ratify the selection of KPMG LLP as independent accountants of
         Treasury TaxAdvantage Portfolio for the fiscal year ending in 2000.

               FOR                       AGAINST              ABSTAIN

               [  ]                       [  ]                 [  ]

6.       In the discretion of such proxies, upon such other business as may
         properly come before the meeting or any adjournment thereof.


<PAGE>   68



- -------------------------------------------------------------------------------
                             YOUR VOTE IS IMPORTANT
                       NO MATTER HOW MANY SHARES YOU OWN

ENCLOSED YOU WILL FIND ONE OR MORE PROXY CARDS RELATING TO EACH OF THE FUNDS FOR
  WHICH YOU ARE ENTITLED TO VOTE.  PLEASE INDICATE YOUR VOTING INSTRUCTIONS ON
  EACH OF THE ENCLOSED PROXY CARDS, DATE AND SIGN THEM, AND RETURN THEM IN THE
ENVELOPE PROVIDED. IF YOU SIGN, DATE AND RETURN A PROXY CARD BUT GIVE NO VOTING
INSTRUCTIONS, YOUR SHARES WILL BE VOTED "FOR" THE NOMINEES FOR DIRECTOR NAMED IN
  THE ATTACHED PROXY STATEMENT AND "FOR" ALL OTHER PROPOSALS INDICATED ON THE
CARDS. IN ORDER TO AVOID THE ADDITIONAL EXPENSES OF FURTHER SOLICITATION, WE ASK
YOUR COOPERATION IN MAILING IN YOUR PROXY CARDS PROMPTLY. UNLESS PROXY CARDS ARE
 SIGNED BY THE APPROPRIATE PERSONS AS INDICATED IN THE INSTRUCTIONS BELOW, THEY
                               WILL NOT BE VOTED.
- -------------------------------------------------------------------------------


                      INSTRUCTIONS FOR SIGNING PROXY CARDS

     The following general rules for signing proxy cards may be of assistance to
you and avoid the time and expense involved in validating your vote if you fail
to sign your proxy card properly.

     1.   Individual Accounts: Sign your name exactly as it appears in the
registration on the proxy card.

     2.   Joint Accounts: Either party may sign, but the name of the party
signing should conform exactly to the name shown in the registration on the
proxy card.

     3.   All Other Accounts: The capacity of the individual signing the proxy
card should be indicated unless it is reflected in the form of registration. For
example:

     REGISTRATION                                    VALID SIGNATURE

Trust Accounts
   (1) ABC Trust Account..........................John B. Doe, Trustee
   (2) Jane B. Doe, Trustee u/t/d 12/28/78........Jane B. Doe

Partnership Accounts
   (1) The XYZ Partnership........................Jane B. Smith, Partner
   (2) Smith and Jones, Limited Partnership.......Jane B. Smith, General Partner

Custodial or Estate Accounts
   (1) John B. Smith, Cust. f/b/o John B. Smith, Jr.
       UGMA/UTMA..................................John B. Smith
   (2) Estate of John B. Smith....................John B. Smith, Jr., Executor

Corporate Accounts
   (1) ABC Corp...................................ABC Corp.
                                                  John Doe, Treasurer
   (2) ABC Corp...................................John Doe, Treasurer
   (3) ABC Corp. c/o John Doe, Treasurer..........John Doe
   (4) ABC Corp. Profit Sharing Plan..............John Doe, Trustee


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