AIM SERIES TRUST
DEFS14A, 1999-07-09
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<PAGE>   1

                             AIM GLOBAL TRENDS FUND
                          11 GREENWAY PLAZA, SUITE 100
                              HOUSTON, TEXAS 77046

                        SPECIAL MEETING OF SHAREHOLDERS

                                                                    July 2, 1999

Dear Shareholder:

     The Board of Trustees ("Board") of AIM Series Trust ("Trust") has voted to
restructure AIM Global Trends Fund ("Fund"), the sole investment portfolio of
the Trust. As you are aware, the Fund currently seeks to achieve its investment
objective of long-term growth of capital by investing substantially all of its
assets in AIM Global Consumer Products and Services Fund, AIM Global Resources
Fund, AIM Global Infrastructure Fund, AIM Global Financial Services Fund, AIM
Global Health Care Fund and AIM Global Telecommunications and Technology Fund
("Theme Funds"). Currently, the Fund operates as a "fund of funds" and invests
in the Theme Funds in proportions related to each sector's proportion in the
Morgan Stanley Capital International All Country World Index ("MSCI Index").
Under the restructuring proposed by A I M Advisors, Inc. ("AIM"), the Fund would
redeem its investments in the Theme Funds and instead would directly invest in
equity securities of U.S. and foreign issuers in the various industry sectors in
which the Theme Funds invest. In allocating the Fund's assets among those
sectors, AIM would actively manage the Fund and would not be tied to each
sector's relative proportion in the MSCI Index.

     The Board and AIM believe that the proposed restructuring would benefit the
Fund and its shareholders. By investing directly in equity securities, the Fund
would be better able to maintain and modify the allocation of its assets among
global industry sectors. In order for the restructuring to occur, certain
matters must be approved by shareholders. Accordingly, a special meeting of
shareholders ("Meeting") will be held on August 25, 1999.

     Attached are the Notice and Proxy Statement for the Meeting which describe
the proposals on which you are being asked to vote. THE BOARD UNANIMOUSLY
RECOMMENDS THAT YOU VOTE "FOR" EACH OF THESE PROPOSALS.

     Your vote is important. Please take a moment now to sign and return your
proxy card in the enclosed postage-paid envelope. 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. You may also
vote your shares on the web at HTTP://WWW.AIMFUNDS.COM by following instructions
that appear on the enclosed proxy insert.

                                          Sincerely,
                                          /s/ ROBERT H. GRAHAM
                                          ---------------------
                                          Robert H. Graham
                                          Chairman and President
<PAGE>   2

                             AIM GLOBAL TRENDS FUND
                          11 GREENWAY PLAZA, SUITE 100
                              HOUSTON, TEXAS 77046

                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                                AUGUST 25, 1999

To the Shareholders:

     Notice is hereby given that a special meeting of shareholders ("Meeting")
of AIM Global Trends Fund ("Fund"), the sole investment portfolio of AIM Series
Trust will be held at 11 Greenway Plaza, Suite 100, Houston, Texas 77046, on
August 25, 1999, at 3:00 p.m., Central time, for the following purposes:

     (1) To approve a new investment advisory agreement for the Fund;

     (2) To approve changes to the fundamental investment restrictions of the
Fund;

     (3) To elect a Trustee;

     (4) To ratify the selection of independent public accountants; and

     (5) To transact any other business, not currently contemplated, that may
properly come before the Meeting, in the discretion of the proxies or their
substitutes.

     Shareholders of record at the close of business on June 21, 1999, are
entitled to notice of, and to vote at, the Meeting. Your attention is called to
the accompanying Proxy Statement. Whether or not you attend the Meeting, we urge
you to PROMPTLY COMPLETE, SIGN, AND RETURN THE ENCLOSED PROXY CARD, so that a
quorum will be present and a maximum number of shares may be voted.

                                          By Order of the Board,
                                          /s/ SAMUEL D. SIRKO
                                          ----------------------
                                          Samuel D. Sirko
                                          Secretary

Houston, Texas
July 2, 1999

YOUR VOTE IS VERY IMPORTANT. PLEASE COMPLETE, SIGN, AND RETURN THE ENCLOSED
PROXY CARD PROMPTLY.
<PAGE>   3

                                PROXY STATEMENT

                             AIM GLOBAL TRENDS FUND
                          11 GREENWAY PLAZA, SUITE 100
                              HOUSTON, TEXAS 77046
                             ---------------------

                        SPECIAL MEETING OF SHAREHOLDERS
                         TO BE HELD ON AUGUST 25, 1999
                             ---------------------

     This Proxy Statement is being furnished to shareholders in connection with
the solicitation of proxies by the Board of Trustees ("Board") of AIM Series
Trust ("Trust"). These proxies are to be used at the Special Meeting of
Shareholders and at any adjournment thereof ("Meeting") to be held at the
offices of the Trust at 11 Greenway Plaza, Suite 100, Houston, Texas 77046, on
August 25, 1999, at 3:00 p.m., Central time. Only shareholders of record at the
close of business on June 21, 1999, are entitled to notice of and to vote at the
Meeting. Copies of this Proxy Statement and the accompanying materials will
first be mailed to shareholders on or about July 6, 1999.

     AIM Global Trends Fund ("Fund") is the sole investment portfolio of the
Trust. The Fund has four classes of shares, but for simplicity and clarity, all
classes of shares of beneficial interest in the Fund are referred to as
"shares." Each outstanding full share of the Fund is entitled to one vote, and
each outstanding fractional share of the Fund is entitled to a proportionate
share of one vote, with respect to each proposal to be voted upon by the
shareholders. Information about the vote necessary to approve a proposal is
discussed below in connection with the proposal.

     If the accompanying proxy card is properly executed and returned by a
shareholder in time to be voted at the Meeting, the shares covered thereby will
be voted in accordance with the instructions marked thereon by the shareholder.
Executed proxies that are unmarked will be voted in accordance with the
recommendation of your Board as to all proposals described in this Proxy
Statement; and, at the discretion of the proxyholders, on any other matter that
may properly have come before the Meeting or any adjournments thereof. Any proxy
given pursuant to this solicitation may be revoked at any time before its
exercise by giving written notice to the Secretary of the Trust or by the
issuance of a subsequent proxy. To be effective, such revocation must be
received by the Secretary of the Trust prior to the Meeting. In addition, a
shareholder may revoke a proxy by attending the Meeting and voting in person.
The solicitation of proxies will be made primarily by mail but also may be made
by telephone, telegraph, telecopy, and personal interviews. Authorization to
execute proxies may be obtained by telephonic or electronically transmitted
instructions.

     The presence in person or by proxy of shareholders of the Fund entitled to
cast one third of all the votes entitled to be cast at the Meeting shall
constitute a quorum at the Meeting. If a quorum is not present at the Meeting or
if a quorum is present but sufficient votes to approve any of the proposals
described in the Proxy Statement are not received, the persons named as proxies
may propose one or more adjournments of the Meeting to permit further
solicitation of proxies. Any such adjournment will require the affirmative vote
of a majority of those shares represented at the Meeting in person or by proxy.
A shareholder vote may be taken on one or more of the proposals in this Proxy
Statement prior to any such adjournment if sufficient votes have been received
and it is otherwise appropriate.

     Broker non-votes are shares held in street name for which the broker
indicates that instructions have not been received from the beneficial owners or
other persons entitled to vote and the broker does not have discretionary voting
authority. Abstentions and broker non-votes will be counted as shares present
for purposes of determining whether a quorum is present, but will not be voted
for or against any proposal or for or against any adjournment to permit further
solicitation of proxies. Accordingly, abstentions and broker non-votes
effectively will be a vote against adjournment or against any proposal where the
required vote is a percentage of the shares present or outstanding. In addition,
abstentions and broker non-votes will not be counted as votes cast for purposes
of determining whether sufficient votes have been received to approve a
proposal.

                                        1
<PAGE>   4

     There were 3,193,655 outstanding shares of the Fund as of the record date,
June 21, 1999 ("Record Date"). To the knowledge of the Trust's management, as of
the Record Date, there were no beneficial owners of 5% or more of the
outstanding shares of any class of the Fund, except as indicated in Exhibit C.

                                PROPOSAL NO. 1:
                APPROVAL OF A NEW INVESTMENT ADVISORY AGREEMENT

BACKGROUND

     The Fund currently seeks to achieve its investment objective of long-term
growth of capital by investing substantially all of its assets in AIM Global
Consumer Products and Services Fund, AIM Global Resources Fund, AIM Global
Infrastructure Fund, AIM Global Financial Services Fund, AIM Global Health Care
Fund and AIM Global Telecommunications and Technology Fund ("Theme Funds"),
which focus their investments on the following global industry sectors: consumer
products and services, financial services, health care, infrastructure, natural
resources, and telecommunications and technology. The Fund operates as a "fund
of funds" and allocates its assets among the Theme Funds according to the
industry weighting of the companies comprising the Morgan Stanley Capital
International All Country World Index ("MSCI Index"), which is a broad unmanaged
index of global stock prices in 38 industry sectors.

     A I M Advisors, Inc. ("AIM") and the Board believe that restructuring the
Fund would be beneficial to the Fund and its shareholders. Under the proposed
restructuring, the Fund would redeem its investments in the Theme Funds and
would directly invest primarily in equity securities of U.S. and foreign issuers
in any or all of the global industry sectors in which the Theme Funds invest.
The remainder of the Fund's assets could be invested in equity securities of
issuers in other global industry sectors or in debt securities of U.S. and
foreign issuers. Rather than committing portions of its assets to a particular
group of global industries based on their respective weighting in the MSCI
Index, under the proposed restructuring, AIM could allocate Fund assets to
industries and industry groups that it believed provided the most advantageous
investment opportunities at a given time. This increased investment flexibility
may enable the Fund to improve its performance. However, there can be no
assurance that the restructuring will lead to better performance. Control over
individual equity selection would thus move directly to the Fund's portfolio
managers. The primary portfolio managers for the restructured Fund would be
Roger Mortimer, Derek Webb and Michael Yellen, each of whom currently serves as
a portfolio manager of each of the Theme Funds.

     The proposed restructuring would not involve any change to the Fund's name
or investment objective. In order to effect the proposed restructuring, however,
shareholders of the Fund need to approve certain changes to the Fund's
operations. These changes are (1) the approval of a new investment advisory
agreement, described in this Proposal 1, and (2) the elimination of the Fund's
policy of concentrating its investments in other investment companies, which is
described in greater detail in Proposal 2A.

     AIM currently serves as investment advisor and administrator to the Fund
pursuant to the Investment Management and Administration Contract between the
Trust and AIM dated May 29, 1998 ("current advisory agreement"). The current
advisory agreement was approved by the initial shareholder on or about May 29,
1998. Because the Fund currently invests in the Theme Funds, which are also
advised by AIM, in proportions dictated by the MSCI Index and without management
discretion, AIM does not directly receive any investment advisory fee from the
Fund. AIM does, however, receive investment advisory fees from each of the Theme
Funds in which the Fund invests. As a result, although the Fund does not
directly pay AIM an advisory fee, it does so indirectly through its investments
in the Theme Funds.

     Under the proposed restructuring, the Fund would be actively managed by
AIM. To reflect AIM's active management of the portfolio, AIM has proposed a new
advisory agreement with the Fund that, among other things, would impose an
advisory fee directly upon the Fund. The advisory fee would be calculated
according to the same advisory fee schedule that applies to the Theme Funds.
Thus, as a result of the proposed restructuring, shareholders of the Fund would
pay approximately the same advisory fees that they currently pay indirectly.
Accordingly, the shareholders of the Fund are being asked to approve a
                                        2
<PAGE>   5

new investment advisory agreement ("proposed advisory agreement"). AIM would
continue to serve as the Fund's administrator and accounting agent under a
separate administration agreement. AIM affiliates would continue to serve as the
Fund's transfer agent and distributor.

     A description of the proposed advisory agreement is provided below under
"Comparison of Agreements" and "Other Terms of the Proposed Advisory Agreement"
sections. Such description is only a summary and is qualified by reference to
the form of investment advisory agreement attached hereto as Exhibit A. A
summary of the Board's considerations is provided below under "Board
Considerations."

COMPARISON OF AGREEMENTS

     Under the current advisory agreement, AIM does not actively manage the
Fund's portfolio, but is simply responsible for the daily allocation and
periodic rebalancing of the Fund's assets among the Theme Funds based on a
predetermined allocation methodology. By contrast, under the proposed advisory
agreement, AIM would actively manage the Fund's portfolio. Specifically, AIM
would, among other things, perform research and analysis for the Fund on
pertinent information about significant developments and economic, statistical
and financial data; determine which issuers and securities would be represented
in the Fund's investment portfolio; and formulate and implement continuing
programs for the purchases and sales of the securities. The following table
shows the proposed advisory fee structure for the Fund. As noted above, this fee
structure is identical to that currently in place for the Theme Funds pursuant
to their advisory agreement with AIM.

                                  ADVISORY FEE
                      (BASED ON AVERAGE DAILY NET ASSETS)

0.975% of the first $500 million; 0.95% on the next $500 million; 0.925% on the
next $500 million; and 0.90% on amounts thereafter.

     The Fund does not pay any fees directly to AIM for services provided under
the current advisory agreement because such fees are paid by the underlying
Theme Funds. The Fund currently pays these advisory fees indirectly. If the
proposed advisory agreement is approved by shareholders, upon the restructuring,
AIM would receive a fee, pursuant to the fee structure set forth above, for the
investment advisory services that it provides to the Fund. The proposed fee
schedule for advisory services is the same as the fee schedule applicable to the
Theme Funds. Under the proposed advisory agreement, it is anticipated that the
Fund would have paid $455,541 to AIM during the last fiscal year.

     Under the current advisory agreement, AIM bears the cost of all ordinary
business expenses of the Fund due to the Fund's investment in the Theme Funds.
Under the proposed advisory agreement, all of the ordinary business expenses not
specifically assumed by AIM incurred in the operations of the Fund and the
offering of its shares shall be paid by the Fund. These expenses include but are
not limited to brokerage commissions, taxes, legal, accounting, auditing or
governmental fees, custodian, transfer agent, and shareholder service agent
costs.

                                        3
<PAGE>   6

                       EXPENSES BEFORE THE RESTRUCTURING

                         ANNUAL FUND OPERATING EXPENSES
                 (expenses that are deducted from Fund assets)

<TABLE>
<CAPTION>
                                                         CLASS A   CLASS B   CLASS C   ADVISOR CLASS
                                                         -------   -------   -------   -------------
<S>                                                      <C>       <C>       <C>       <C>
Management Fees........................................  None      None      None      None
Distribution and/or Service (12b-1) Fees...............  0.50%     1.00%     1.00%     None
Other Expenses(1)......................................  None      None      None      None
Total Annual Fund Operating Expenses...................  0.50      1.00      1.00      None
</TABLE>

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

(1) "Other Expenses," including transfer agency, legal and audit fees, and other
    operating expenses, are borne by AIM.

     The table above does not reflect the Fund's indirect pro rata share of the
fees and expenses incurred by the Theme Funds. The following table shows the
aggregate expense ratio of each class of the Fund based on a weighted average of
the expense ratios of Advisor Class shares of the Theme Funds in which the Fund
was invested as of October 31, 1998, plus the Fund's total operating expenses.
These percentages do not necessarily reflect the current allocation of the
Fund's assets to the Theme Funds.

                               AGGREGATE EXPENSES
                (including the Fund's indirect pro rata share of
               the fees and expenses incurred by the Theme Funds)

<TABLE>
<CAPTION>
                                                         CLASS A   CLASS B   CLASS C   ADVISOR CLASS
                                                         -------   -------   -------   -------------
<S>                                                      <C>       <C>       <C>       <C>
Aggregate Expenses.....................................  1.95%     2.45%     2.45%     1.45%
</TABLE>

                   ESTIMATED EXPENSES AFTER THE RESTRUCTURING

                         ANNUAL FUND OPERATING EXPENSES
                 (expenses that are deducted from Fund assets)

<TABLE>
<CAPTION>
                                                         CLASS A   CLASS B   CLASS C   ADVISOR CLASS
                                                         -------   -------   -------   -------------
<S>                                                      <C>       <C>       <C>       <C>
Management Fees........................................  0.98%     0.98%     0.98%     0.98%
Distribution and/or Service (12b-1) Fees...............  0.50%     1.00%     1.00%     None
Other Expenses (including transfer agency, legal and
  audit fees, and other operating expenses)(1).........  0.80%     0.83%     0.83%     0.80%
Total Annual Fund Operating Expenses...................  2.28%     2.81%     2.81%     1.78%
  Expense Reimbursement................................  0.28%     0.31%     0.31%     0.28%
Net Expenses(2)........................................  2.00%     2.50%     2.50%     1.50%
</TABLE>

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

(1) "Other Expenses" are estimated.

(2) AIM has contractually agreed to limit the Fund's net expenses.

     A table containing advisory fee schedules of comparable mutual funds
advised by AIM is attached hereto for your reference as Exhibit B.

OTHER TERMS OF THE PROPOSED ADVISORY AGREEMENT

     In performing its obligations under the proposed advisory agreement, AIM
would be required to comply with all applicable laws. In the absence of willful
misfeasance, bad faith, gross negligence, or reckless disregard of obligations
or duties hereunder on the part of AIM or any of its officers, directors, or
employees, AIM shall not be subject to liability to the Trust or to the Fund or
to any shareholder of the Fund 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.

                                        4
<PAGE>   7

     The proposed advisory agreement provides that, subject to the approval of
the Board and the shareholders of the Fund, AIM may delegate any and all of its
duties to a sub-adviser, provided that AIM shall continue to supervise the
performance of any such sub-adviser.

     The proposed advisory agreement may be terminated at any time without
penalty by vote of the Board or by a vote of a majority of the outstanding
voting securities of the Fund, on 60 days' written notice to AIM. The proposed
advisory agreement will terminate automatically in the event of any assignment,
as defined by the Investment Company Act of 1940, as amended (the "1940 Act").
The proposed advisory agreement continues automatically for successive periods
not to exceed twelve months each, provided that such continuance is specifically
approved at least annually (i) by a vote of a majority of the independent Board
members, cast in person at a meeting called for the purpose of voting on such
approval, and (ii) by the Board or by vote of a majority of the outstanding
voting securities of the Fund.

BOARD CONSIDERATIONS

     At a series of meetings with the Board, AIM described the anticipated
effects of the restructuring on the Fund, including a potential improvement in
the Fund's performance and marketability. In connection with its review of the
proposed restructuring, the Board considered the performance of the Fund and of
the Theme Funds; the slow growth of the Fund since commencement of operations;
the potentially beneficial impact of the restructuring on the Fund and its
shareholders; comparative information about other funds and their fees and
expenses; and the likely costs associated with the restructuring (including
shareholder solicitation costs and brokerage costs related to the Fund's initial
investments in equity securities).

     The Board also evaluated the proposed advisory agreement. The Board
considered that the proposed advisory agreement, including the terms relating to
the services to be provided and the fees and expenses payable by the Fund, are
not materially different from the current advisory agreements for the Theme
Funds. In approving the proposed advisory agreement, the Board took into account
that, except for the establishment of a fee that is currently paid to AIM by the
Fund indirectly through its investments in the underlying Funds, the
responsibility of the Fund for all ordinary operating expenses, and moving
provisions for administration services into a separate administration agreement
with AIM, there are no material differences between the provisions of the
current advisory agreement and the proposed advisory agreement.

     In particular, the Board considered that, as the Fund is currently
structured, the aggregate annual expense ratios (including the Fund's indirect
pro rata share of the expenses of the Theme Funds) of Class A, Class B, Class C,
and Advisor Class shares are 1.95%, 2.45%, 2.45%, and 1.45%, respectively, of
the average daily net assets allocable to those classes of shares. The Board
further considered that, under the proposed advisory agreement, the expense
ratios of Class A, Class B, Class C, and Advisor Class shares would likely be
slightly higher but would in any event be capped, until June 30, 2000, at 2.00%,
2.50%, 2.50%, and 1.50%, respectively, of the average daily net assets allocable
to those classes of shares. The Board was advised that the current slightly
lower aggregate annual expense ratios were due to the benefits of economies of
scale realized by the Fund as a result of investment in certain larger Theme
Funds.

     The Board also considered the services to be supplied by AIM following the
restructuring and the fees to be charged relative both to those now charged
indirectly through the Theme Funds and to those charged by AIM to other global
equity funds that it advises (see Exhibit B). The Board considered each of the
foregoing factors. Based upon these considerations, the Board, including its
members who are not interested persons of the Fund (as that term is defined in
the 1940 Act) ("independent Board members"), unanimously approved the proposed
advisory agreement and recommended approval by the shareholders.

                                        5
<PAGE>   8

SHAREHOLDER APPROVAL REQUIREMENTS

     Approval of the proposed advisory agreement on behalf of the Fund requires
the affirmative vote of a "majority of the outstanding voting securities" of the
Fund, which for this purpose means the affirmative vote of the lesser of (i)
more than 50% of the outstanding shares of the Fund or (ii) 67% or more of the
shares of the Fund present at the Meeting if more than 50% of the outstanding
shares of the Fund are represented at the Meeting in person or by proxy. The
proposed advisory agreement is completely contingent upon the approval of
Proposal 2A and will not become effective unless Proposal 2A is approved. If
Proposal 2A is not approved, AIM will continue to perform its duties under the
current advisory agreement and the Fund will continue to invest in the Theme
Funds, until the Board decides what further action to take with respect to the
Fund.

              THE BOARD RECOMMENDS THAT YOU VOTE "FOR" PROPOSAL 1.
                             ---------------------

                                PROPOSAL NO. 2:
              APPROVAL OF CHANGES TO THE FUNDAMENTAL RESTRICTIONS

BACKGROUND

     The Board proposes several changes to the fundamental investment
restrictions of the Fund. The first proposed change described below -- to the
Fund's policy of concentrating its investments in other investment
companies -- is required to effect the restructuring of the Fund in the manner
described in Proposal 1. The remaining proposed revisions to the Fund's
fundamental restrictions are intended generally to promote uniformity with the
fundamental restrictions of other AIM Funds.

PROPOSED CHANGES

     The following is the text and a summary description of the proposed changes
to the Fund's fundamental restrictions. Shareholders may request from the Fund a
copy of the Fund's Statement of Additional Information for the text of the
Fund's existing fundamental restrictions, by calling 1-800-347-4246.

     With respect to each existing or proposed 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.

  A. Modification of Fundamental Restriction on Concentration

     Proposed Change: Upon the approval of Proposal 2A, the existing fundamental
restriction on concentration would be modified 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 [as defined below]) of its investments in
     the securities of issuers primarily engaged in the same industry. This
     restriction does not limit the Fund's investment in (i) obligations issued
     or guaranteed by the U.S. government, its agencies or instrumentalities,
     (ii) tax-exempt obligations issued by government 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.

     Discussion: The Fund currently has a fundamental policy that it "will
concentrate more than 25% of its assets in the mutual fund industry." Under the
proposed restructuring, the Fund will no longer invest substantially all of its
assets in other investment companies. Accordingly, in order for the Fund to
restructure in the manner contemplated, the current concentration policy must be
modified. Under the proposed modified policy, the Fund will not concentrate its
investments in any industry.

                                        6
<PAGE>   9

  B. Modification of Fundamental Restriction on Portfolio Diversification

     Proposed Change: Upon the approval of Proposal 2B, the existing fundamental
restriction on portfolio diversification would be modified 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 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 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 Fund's current fundamental restriction on portfolio
diversification lists the percentage standards set forth in the 1940 Act for a
diversified fund. In order to qualify as a diversified investment company under
the 1940 Act, the Fund may not purchase securities of any one issuer if, as a
result, more than 5% of the Fund's total assets would be invested in securities
of that issuer or the Fund would own or hold more than 10% of the outstanding
voting securities of that issuer, except that up to 25% of the Fund's total
assets may be invested without regard to this limitation, and except that this
limitation does not apply to securities issued or guaranteed by the U.S.
government, its agencies or instrumentalities or to securities issued by other
investment companies. The proposed modified policy adopts the same 1940 Act
standards. However, by not listing the percentage limitations, the proposed
policy would change automatically if the 1940 Act Laws, Interpretations and
Exemptions change.

  C. Addition of Fundamental Policy on Investments in Investment Companies

     Proposed Change: Upon the approval of Proposal 2C, a fundamental policy on
investments in other investment companies would be added as follows:

     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 same fundamental
     investment objectives, policies and limitations as the Fund.

     Discussion: The new policy is proposed in order to provide the Fund the
flexibility to take advantage of potential efficiencies in the future available
through investment in another open-end fund. The Board has not considered any
proposal to authorize the Fund to invest its assets in this fashion. However,
adoption of this policy at this time would avoid the costs of a subsequent
shareholder meeting in the event the Board were to determine to invest the
Fund's assets in this fashion.

  D. Modification of Fundamental Restriction on Issuing Senior Securities and
     Borrowing Money

     Proposed Change: Upon the approval of Proposal 2D, the existing fundamental
restriction on issuing senior securities and borrowing money would be modified
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 Fund's current fundamental restriction limits borrowing
to 33 1/3% of the Fund's total assets and prohibits the Fund from purchasing any
security while any borrowings are outstanding, except that the Fund may borrow
an additional 5% of the Fund's total assets for temporary or emergency purposes.
The proposed changes would make the Fund's restriction on borrowing money or
issuing senior securities no more limiting than required by the 1940 Act. The
Board believes that changing the Fund's fundamental restrictions in this manner
will provide flexibility for future contingencies. However, the Board does not
currently intend the change to affect the Fund's operations, under which the
Fund does not borrow for investment purposes.

  E. Modification of Fundamental Restriction on Underwriting Securities

     Proposed Change: Upon the approval of Proposal 2E, the existing fundamental
restriction on underwriting securities would be modified as follows:

                                        7
<PAGE>   10

     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 changes to this fundamental restriction would
eliminate minor differences in the wording of the Fund's current restriction on
underwriting securities as compared to other AIM Funds. The substance of the
fundamental restriction would remain unchanged.

  F. Modification of Fundamental Restriction on Real Estate Investments

     Proposed Change: Upon the approval of Proposal 2F, the existing fundamental
restriction on real estate investments would be modified 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
eliminate minor differences in the wording of the Fund's current restriction on
real estate investments as compared to other AIM Funds. The substance of the
fundamental restriction would remain unchanged.

  G. Modification of Fundamental Restriction on Making Loans

     Proposed Change: Upon the approval of Proposal 2G, the existing fundamental
restriction on making loans would be modified as follows:

     The Fund may not make personal loans or loans to persons who control or are
     under the 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 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 change to this fundamental restriction is intended
to promote uniformity with the analogous fundamental restriction of other AIM
Funds. The proposed restriction would narrow somewhat the scope of the current
fundamental restriction, which prohibits the Fund from making loans, subject to
substantially the same exceptions as in the proposed restriction. The proposed
restriction only prohibits personal loans or loans to persons who control or are
under the common control of the Fund.

     REQUIRED VOTE. Approval of each of the changes contemplated by Proposal 2
requires the affirmative vote of a "majority of the outstanding voting
securities" of the Fund, which for this purpose means the affirmative vote of
the lesser of (1) more than 50% of the outstanding shares of the Fund or (2) 67%
or more of the shares of the Fund present at the Meeting if more than 50% of the
outstanding shares of the Fund are represented at the Meeting in person or by
proxy. If the proposed changes are approved by shareholders of the Fund at the
Meeting, those changes will be effective upon appropriate disclosure being made
in the Fund's Prospectus and Statement of Additional Information.

     IF ONE OR MORE OF THE CHANGES CONTEMPLATED BY PROPOSAL 2 ARE NOT APPROVED
BY SHAREHOLDERS, THE RELATED EXISTING FUNDAMENTAL RESTRICTION(S) OF THE FUND
WILL CONTINUE IN EFFECT.

              THE BOARD RECOMMENDS THAT YOU VOTE "FOR" PROPOSAL 2
                             ---------------------

                                        8
<PAGE>   11
                                PROPOSAL NO. 3:
                             ELECTION OF A TRUSTEE

     The Board has nominated the individual identified below for election to the
Board at the Meeting. It is the intention of each proxyholder named on the
accompanying proxy card to vote FOR the election of the nominee listed below
unless the Fund shareholder specifically indicates on his or her proxy card a
desire to withhold authority to vote for the nominee. The Board does not
contemplate that the nominee, who has consented to being nominated, will be
unable to serve as a Trustee for any reason but if that should occur prior to
the Meeting, the proxies will be voted for such other nominee as the Board may
recommend.

         INFORMATION REGARDING THE NOMINEE FOR ELECTION AT THE MEETING

<TABLE>
<CAPTION>
                                                                                         POSITION(S) WITH TRUST
NAME, AGE, AND BUSINESS EXPERIENCE DURING THE PAST FIVE YEARS AND OTHER DIRECTORSHIPS          AND TENURE
- -------------------------------------------------------------------------------------    ----------------------
<S>                                                                                    <C>              <C>
ROBERT H. GRAHAM, Age 52*...............................................               Trustee,         Since 1998
Mr. Graham is Director, President and Chief Executive Officer, A I M Management Group  Chairman of
Inc.; Director and President, AIM; Director and Senior Vice President, A I M Capital   the Board, and
Management, Inc., A I M Distributors, Inc., A I M Fund Services, Inc. and Fund         President
Management Company; and Director, AMVESCAP PLC.

                      INFORMATION REGARDING OTHER TRUSTEES

C. DEREK ANDERSON, Age 57...............................................               Trustee          Since 1996
Mr. Anderson is President, Plantagenet Capital Management, LLC (an investment
partnership); Chief Executive Officer, Plantagenet Holdings, Ltd. (an investment
banking firm); Director, Anderson Capital Management, Inc., since 1988; Director,
PremiumWear, Inc. (formerly Munsingwear, Inc.) (a casual apparel company); and
Director, "R" Homes, Inc. and various other companies. Mr. Anderson is also a
director or trustee of several other investment companies registered under the 1940
Act that are managed or administered by AIM.

FRANK S. BAYLEY, Age 59.................................................               Trustee          Since 1996
Mr. Bayley is a partner of the law firm of Baker & Mackenzie; and Director and
Chairman of C.D. Stimpson Company (a private investment company). Mr. Bayley is also
a director or trustee of several other investment companies registered under the 1940
Act that are managed or administered by AIM.

ARTHUR C. PATTERSON, Age 55.............................................               Trustee          Since 1996
Mr. Patterson is a Managing Partner of Accel Partners (a venture capital firm). He
also serves as a director of Viasoft and Pagemart, Inc. (both publicly-traded
software companies), as well as several privately held software and communications
companies. Mr. Patterson is also a director or trustee of several other investment
companies registered under the 1940 Act that are managed or administered by AIM.

RUTH H. QUIGLEY, Age 64.................................................               Trustee          Since 1996
Ms. Quigley is a private investor. From 1984 to 1986, she was President of Quigley
Friedlander & Co., Inc. (a financial advisory services firm). Ms. Quigley is also a
director or trustee of several other investment companies registered under the 1940
Act that are managed or administered by AIM.
</TABLE>
- ---------------

* Mr. Graham is deemed an "interested person" of the Trust, as defined in the
  1940 Act, by virtue both of his office and his association with AIM and its
  affiliates.

                                        9
<PAGE>   12
                     INFORMATION REGARDING OTHER EXECUTIVE
                             OFFICERS OF THE TRUST

<TABLE>
<CAPTION>
                                                                POSITION(S) WITH THE FUND
NAME, AGE, AND BUSINESS EXPERIENCE DURING THE PAST FIVE YEARS          AND TENURE
- -------------------------------------------------------------   -------------------------
<S>                                                            <C>              <C>
MELVILLE B. COX, Age 55.....................................   Vice President   Since 1998
Mr. Cox is Vice President and Chief Compliance Officer, AIM,
A I M Capital Management, Inc., A I M Distributors, Inc.,
A I M Fund Services, Inc., and Fund Management Company.

GARY T. CRUM, Age 51........................................   Vice President   Since 1998
Mr. Crum is Director and President, A I M Capital Management,
Inc.; Director and Senior Vice President, A I M and A I M
Management Group Inc.; and Director, A I M Distributors, Inc.
and AMVESCAP.

CAROL F. RELIHAN, Age 44....................................   Vice President   Since 1998
Ms. Relihan is Director, Senior Vice President, General
Counsel, and Secretary, AIM; 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.

SAMUEL D. SIRKO, Age 39.....................................   Vice President   Since 1998
Mr. Sirko is Assistant General Counsel and Assistant           and Secretary
Secretary, A I M Management Group Inc., A I M Capital
Management, Inc., A I M Distributors, Inc., A I M Fund
Services, Inc., and Fund Management Company; and Vice
President, Assistant General Counsel and Assistant Secretary
of AIM.

DANA R. SUTTON, Age 40......................................   Vice President   Since 1999
Ms. Sutton is Vice President and Fund Controller, AIM and      and Treasurer
Assistant Vice President and Assistant Treasurer, Fund
Management Company.
</TABLE>

     To the knowledge of the Trust's management, as of the Record Date, the
Trustees and Officers of the Fund owned, as a group, less than 1% of the
outstanding shares of the Fund.

     There were fifteen meetings of the Trust's Board held during the Fund's
fiscal year ended December 31, 1998. The Board has a Nominating and Audit
Committee composed of Miss Quigley (Chair) and Messrs. Anderson, Bayley and
Patterson. The purpose of the Nominating and Audit Committee is to nominate
persons to serve as Trustees, review annual audits of the Fund, and recommend
firms to serve as independent auditors for the Fund. The Nominating and Audit
Committee does not normally consider nominees recommended by shareholders.
During the Fund's last completed fiscal year, the Nominating and Audit Committee
met five times. During the fiscal year ended December 31, 1998, each Trustee
attended at least 75% of the total number of meetings of the Board held during
their tenure and each member of the Nominating and Audit Committee attended at
least 75% of the meetings of that committee.

     All of the Trustees also serve as directors or trustees of certain of the
investment companies managed, administered, or advised by AIM ("Fund Complex").
The Trust pays each Trustee, who is not a director, officer or employee of AIM
or any affiliated company, an annual retainer component, plus a per-meeting fee
component for each Board or committee meeting attended by such Trustee and
reimburses travel and other out-of-pocket expenses incurred in connection with
attending such meetings. The table below

                                       10
<PAGE>   13

summarizes the compensation of the Trust's Trustees and for the fiscal year
ended December 31, 1998 and provides the total compensation paid to the Board
members by the Fund Complex for the fiscal year ended December 31, 1998.

                             COMPENSATION TABLE(1)

<TABLE>
<CAPTION>
                                                                                TOTAL COMPENSATION
                                                     AGGREGATE COMPENSATION       FROM THE TRUST
            NAME OF PERSON, POSITION(2)                  FROM THE TRUST       AND THE FUND COMPLEX(2)
            ---------------------------              ----------------------   -----------------------
<S>                                                  <C>                      <C>
C. Derek Anderson..................................          $7,700                  $106,850
  Trustee
Frank S. Bayley....................................          $7,100                  $ 90,650
  Trustee
Arthur C. Patterson................................          $7,400                  $ 98,600
  Trustee
Ruth H. Quigley....................................          $7,700                  $ 99,500
  Trustee
</TABLE>

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

(1) The Trustees do not receive any pension or retirement benefits as
    compensation for their services to the Fund.

(2) As an employee of AIM, Mr. Graham receives no additional compensation from
    the Trust for serving as a Trustee.

     REQUIRED VOTE. A plurality of all the votes cast at the Meeting is required
for the election of the Trustee.

              THE BOARD RECOMMENDS THAT YOU VOTE "FOR" PROPOSAL 3
                             ---------------------

                                PROPOSAL NO. 4:
                        RATIFICATION OF THE SELECTION OF
                         INDEPENDENT PUBLIC ACCOUNTANTS

     At a meeting called for the purpose of such selection, the firm of
PricewaterhouseCoopers LLP was selected by the Board, including its trustees who
are not "interested persons" of the Trust or AIM as the independent public
accountants to audit the books and accounts of the Fund for the fiscal year
ending December 31, 1999 and to include its opinion in financial statements
filed with the SEC. The Board has directed the submission of this selection to
the shareholders for ratification. PricewaterhouseCoopers LLP has advised the
Board that it has no financial interest in the Fund. For the fiscal year ended
December 31, 1998, the professional services rendered by PricewaterhouseCoopers
LLP included the issuance of an opinion on the financial statements of the Fund
and an opinion on other reports of the Fund filed with the SEC. Representatives
of PricewaterhouseCoopers LLP are not expected to be present at the Meeting, but
have been given the opportunity to make a statement if they so desire and will
be available should any matter arise requiring their presence.

     REQUIRED VOTE. Ratification of the selection of PricewaterhouseCoopers LLP
requires the affirmative vote of a majority of the votes cast thereon at the
Meeting.

              THE BOARD RECOMMENDS THAT YOU VOTE "FOR" PROPOSAL 4
                             ---------------------

                                       11
<PAGE>   14
                     INFORMATION ABOUT THE FUND'S ADVISOR,
                   ADMINISTRATOR, AND THE FUND'S DISTRIBUTOR

     AIM serves as investment advisor to the Fund. AIM is located at 11 Greenway
Plaza, Suite 100, Houston, Texas 77046-1173. The advisor supervises all aspects
of the Fund's operations and provides investment advisory services to the Fund.
AIM has acted as an investment advisor since its organization in 1976. Today,
AIM, together with its subsidiaries, advises or manages over 110 investment
portfolios, including the Fund, encompassing a broad range of investment
objectives. A I M Distributors, Inc. ("AIM Distributors") acts as the Fund's
distributor. AIM Distributors is located at 11 Greenway Plaza, Suite 100,
Houston, Texas 77046-1173.

                                      AIM
                       DIRECTORS AND PRINCIPAL OFFICER(1)

<TABLE>
<CAPTION>
NAME                                       POSITION WITH AIM                   PRINCIPAL OCCUPATION
- ----                                       -----------------                   --------------------
<S>                              <C>                                    <C>
Charles T. Bauer, C.F.A........  Director and Chairman                  Director and Chairman of the Board
                                                                        of Directors, A I M Management
                                                                        Group Inc., AIM, A I M Capital
                                                                        Management, Inc., A I M
                                                                        Distributors, Inc., A I M Fund
                                                                        Services, Inc. and Fund Management
                                                                        Company; and Vice Chairman and
                                                                        Director, AMVESCAP PLC.

Gary T. Crum...................  Director and Senior Vice President     Director and President, A I M
                                                                        Capital Management, Inc.; Director
                                                                        and Senior Vice President, A I M
                                                                        Management Group Inc. and A I M;
                                                                        and Director, A I M Distributors,
                                                                        Inc. and AMVESCAP PLC.

Robert H. Graham...............  Director and President                 Director, President and Chief
                                                                        Executive Officer, A I M Management
                                                                        Group Inc.; Director and President,
                                                                        AIM; 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, AMVESCAP
                                                                        PLC.

Dawn M. Hawley.................  Director, Senior Vice President and    Senior Vice President and Chief
                                   Treasurer                            Financial Officer, A I M Management
                                                                        Group Inc., AIM; 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.
</TABLE>

                                       12
<PAGE>   15

<TABLE>
<CAPTION>
NAME                                       POSITION WITH AIM                   PRINCIPAL OCCUPATION
- ----                                       -----------------                   --------------------
<S>                              <C>                                    <C>
Carol F. Relihan...............  Director, Senior Vice President,       Director, Senior Vice President,
                                   General Counsel and Secretary        General Counsel and Secretary, AIM;
                                                                        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.
</TABLE>

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

(1) Each director and the principal officer may be reached at 11 Greenway Plaza,
    Suite 100, Houston, Texas 77046-1173.

     AIM and AIM Distributors are each indirect wholly-owned subsidiaries of
AMVESCAP PLC, which is an independent investment management group that has a
significant presence in the institutional and retail segment of the investment
management industry in North America and Europe, and a growing presence in Asia.
AMVESCAP PLC is located at 11 Devonshire Square, London, EC2M 4YR, England.

                     ADDITIONAL INFORMATION ABOUT THE FUND

     For more information with respect to the Trust and the Fund, please refer
to the Fund's Prospectus and Statement of Additional Information included in the
Trust's Registration Statement (SEC file No. 333-30551), and the most recent
annual and semi-annual reports to shareholders. These documents and other
information filed by the Trust may be inspected without charge and copied at the
public reference facilities maintained by the SEC at Room 1014, Judiciary Plaza,
450 Fifth Street, N.W., Washington, DC 20549. Copies of such material may also
be obtained from the Public Reference Section of the SEC at the prescribed
rates. The SEC maintains an internet web site at http://www.sec.gov that
contains information regarding the Trust, the Fund, and other registrants that
file electronically with the SEC.

                              GENERAL INFORMATION

SOLICITATION OF PROXIES

     The Trust will request broker/dealer firms, custodians, nominees and
fiduciaries to forward proxy material to the beneficial owners of the shares
held of record by such persons. The Trust may reimburse such broker/dealer
firms, custodians, nominees and fiduciaries for their reasonable expenses
incurred in connection with such proxy solicitation. In addition to the
solicitation of proxies by mail, officers of the Trust and employees of AIM and
its affiliates, without additional compensation, may solicit Proxies in person
or by telephone. The costs associated with such solicitation and the Meeting
will be borne by AIM.

     The Trust has retained Shareholder Communications Corporation ("SCC"), a
professional proxy solicitation firm, to assist in the solicitation of proxies.
You may receive a telephone call from this firm concerning this proxy
solicitation. The Trust estimates that SCC will be paid fees of approximately
$5,000. In addition, SCC will be paid for its expenses incurred; the amount of
these expenses will depend on the nature and extent of the services provided in
connection with the solicitation. Because the Fund's expenses are expected to
exceed the applicable expense caps, the Trust anticipates that SCC's fees will
be borne by AIM. THE BOARD DOES NOT KNOW OF ANY MATTERS TO BE PRESENTED AT THE
MEETING OTHER THAN THOSE DESCRIBED IN THIS PROXY STATEMENT, BUT SHOULD ANY OTHER
MATTER REQUIRING A VOTE OF SHAREHOLDERS ARISE, THE PROXYHOLDERS WILL VOTE
THEREON ACCORDING TO THEIR BEST JUDGMENT IN THE INTERESTS OF THE FUND.

                                       13
<PAGE>   16
PROPOSALS OF SHAREHOLDERS

     Shareholders wishing to submit proposals for inclusion in a proxy statement
for a shareholder meeting subsequent to the Meeting, if any, should send their
written proposals to the Secretary of AIM Funds, 11 Greenway Plaza, Suite 100,
Houston, Texas 77046, within a reasonable time before the solicitation of
proxies for such meeting. The timely submission of a proposal does not guarantee
its inclusion. Normally, there will be no annual meeting of shareholders in any
year, except as required under the 1940 Act.

REPORTS TO SHAREHOLDERS

     THE TRUST WILL FURNISH TO SHAREHOLDERS, WITHOUT CHARGE AND UPON REQUEST, A
COPY OF THE MOST RECENT ANNUAL REPORT AND A COPY OF THE MOST RECENT SEMI-ANNUAL
REPORT FOLLOWING SUCH ANNUAL REPORT OF THE FUND. REQUESTS FOR SUCH REPORTS MAY
BE MADE BY WRITING TO THE TRUST AT 11 GREENWAY PLAZA, SUITE 100, HOUSTON, TEXAS
77046, OR BY CALLING (800) 347-4246.

     IN ORDER THAT THE PRESENCE OF A QUORUM AT THE MEETING MAY BE ASSURED,
PROMPT EXECUTION AND RETURN OF THE ENCLOSED PROXY IS REQUESTED. A
SELF-ADDRESSED, POSTAGE-PAID ENVELOPE IS ENCLOSED FOR YOUR CONVENIENCE.

                                          By Order of the Board,

                                          /s/ SAMUEL D. SIRKO
                                          ------------------------
                                          Samuel D. Sirko
                                          Secretary

July 2, 1999
11 Greenway Plaza, Suite 100,
Houston, Texas 77046

                                       14
<PAGE>   17

                                                                       EXHIBIT A

                                AIM SERIES TRUST

                      MASTER INVESTMENT ADVISORY AGREEMENT

     THIS AGREEMENT is made this   day of           , 1999, by and between AIM
Series Trust, a Delaware business trust (the "Company") with respect to its
series of shares shown on 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 Company is registered under the Investment Company Act of
1940, as amended (the "1940 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 Company's Agreement and Declaration of Trust authorizes the
Board of Trustees of the Company to classify shares of the Company, and as of
the date of this Agreement, the Company's Board of Trustees has authorized the
issuance of one series of shares representing interests in one investment
portfolio (such portfolio and any other portfolios hereafter added to the
Company being referred to collectively herein as the "Funds"); and

     WHEREAS, the Company 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 Company's Board of Trustees. The Advisor shall give
the Company and the Funds the benefit of its best judgment, efforts and
facilities in rendering its services as investment advisor.

     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 Company's
     Board of Trustees; and

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

and take, on behalf of the Company and the Funds, all actions which appear to
the Company 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.

                                       A-1
<PAGE>   18

     3. Delegation of Responsibilities. Subject to the approval of the Board of
Trustees and, if required by law, the shareholders of the Funds, the Advisor may
delegate to a sub-advisor certain of its duties enumerated in Section 2 hereof,
provided that the Advisor shall continue to supervise the performance of any
such sub-advisor.

     4. 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 of the Company.

     5. 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 Company, 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 Agreement and Declaration of Trust of the
     Company, as the same may be amended from time to time;

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

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

     6. 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. The Advisor's primary consideration in effecting
a security transaction will be to obtain execution at the most favorable price.
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; the size of
and the difficulty in executing the order; 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 available from another broker-dealer if the
difference is reasonably justified by other aspects of the fund execution
services offered. 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 Company, 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 of
the Company indicating the brokers to whom such allocations have been made and
the basis therefor. 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.

     7. Compensation. The Company shall pay the Advisor as compensation for
services rendered hereunder an annual fee, payable monthly, based upon the
average daily net assets of the Funds as the same is set forth in Appendix A
attached hereto. The average daily net asset value of the Funds shall be
                                       A-2
<PAGE>   19

determined in the manner set forth in the Agreement and Declaration of Trust and
registration statement of the Company, as amended from time to time.

     8. Additional Services. Upon the request of the Company's Board of
Trustees, the Advisor may perform certain accounting, shareholder servicing or
other administrative services on behalf of the Funds which are not required by
this Agreement. Such services will be performed on behalf of the Funds and the
Advisor may receive from the Funds such reimbursement for costs or reasonable
compensation for such services as may be agreed upon between the Advisor and the
Company's Board of Trustees based on a finding by the Board of Trustees that the
provision of such services by the Advisor is in the best interests of the
Company and its shareholders. Payment or assumption by the Advisor of any fund
expense that the Advisor is not otherwise required to pay or assume under this
Agreement shall not relieve the Advisor of any of its obligations to the Funds
nor obligate the Advisor to pay or assume any similar fund expense on any
subsequent occasions. Such services may include, but are not limited to:

          (a) the services of a principal financial officer of the Company
     (including applicable office space, facilities and equipment) whose normal
     duties consist of maintaining the financial accounts and books and records
     of the Company and the Funds, including the review and calculation of daily
     net asset value and the preparation of tax returns; and the services
     (including applicable office space, facilities and equipment) of any of the
     personnel operating under the direction of such principal financial
     officer;

          (b) the services of staff to respond to shareholder inquiries
     concerning the status of their accounts; providing assistance to
     shareholders in exchanges among the mutual funds managed or advised by the
     Advisor; changing account designations or changing addresses; assisting in
     the purchase or redemption of shares; supervising the operations of the
     custodian, transfer agent(s) or dividend disbursing agent(s) for the Funds;
     or otherwise providing services to shareholders of the Funds; and

          (c) such other administrative services as may be furnished from time
     to time by the Advisor to the Company or the Funds at the request of the
     Company's Board of Trustees.

     9. 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 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
directors and shareholder meetings, the cost of preparing and distributing
reports and notices to shareholders, the fees and other expenses incurred by the
Company 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.

     10. Non-Exclusivity. The services of the Advisor to the Company and the
Funds are not to be deemed to be exclusive, and the Advisor shall be free to
render investment advisory and administrative or other services to others
(including other investment companies) and to engage in other activities. It is
understood and agreed that officers or directors of the Advisor may serve as
officers or directors of the Company, and that officers or directors of the
Company 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.

     11. Term and Approval. This Agreement shall become effective with respect
to a Fund if approved by the shareholders of such Fund, and if so approved, this
Agreement shall thereafter continue in force for

                                       A-3
<PAGE>   20

an initial period of two years 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 Company's 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) 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 Company trustees), by
     votes cast in person at a meeting specifically called for such purpose.

     12. Termination. This Agreement may be terminated as to the Company or as
to any one or more of the Funds at any time, without the payment of any penalty,
by vote of the Company's 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.

     13. Liability of Advisor and Indemnification. 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 Company 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.

     14. 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 Company individually but are binding
only upon the assets and property of the Company and that the shareholders shall
be entitled, to the fullest extent permitted by applicable law, to the same
limitation on personal liability as stockholders of private corporations for
profit.

     15. 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 Company shall be and that of the Advisor shall be Eleven
Greenway Plaza, Suite 100, Houston, Texas 77046.

     16. 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 Securities and Exchange Commission 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 Securities and Exchange Commission, 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
Delaware.

     17. License Agreement. The Company 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
Company with respect to such series of shares.

                                       A-4
<PAGE>   21

     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>
                                                       AIM SERIES TRUST
                                                       (a Delaware business trust)
Attest:

- -----------------------------------------------------  By: -------------------------------------------------
Assistant Secretary                                    President
(SEAL)

                                                       A I M ADVISORS, INC.
Attest:

- -----------------------------------------------------  By: -------------------------------------------------
Assistant Secretary                                    President
(SEAL)
</TABLE>

                                       A-5
<PAGE>   22

                                   APPENDIX A
                                       TO
                      MASTER INVESTMENT ADVISORY AGREEMENT
                                       OF
                                AIM SERIES TRUST

     The Company shall pay the Advisor, out of the assets of a Fund, as full
compensation for all services rendered and all facilities furnished hereunder, a
management fee for such Fund set forth below. Such fees 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.

                             AIM GLOBAL TRENDS FUND

<TABLE>
<CAPTION>
                       NET ASSETS                          ANNUAL RATE
                       ----------                          -----------
<S>                                                        <C>
First $500 million.......................................  0.975%
Next $500 million........................................  0.95%
Next $500 million........................................  0.925%
On amounts thereafter....................................  0.90%
</TABLE>

                                       A-6
<PAGE>   23

                                                                       EXHIBIT B

                       FEE CHART FOR COMPARABLE AIM FUNDS

<TABLE>
<CAPTION>
                                                                                 TOTAL AVERAGE NET
                                                                                ASSETS FOR THE MOST
                                                    ADVISORY FEE                RECENTLY COMPLETED
                FUND                    (BASED ON AVERAGE DAILY NET ASSETS)         FISCAL YEAR
                ----                    -----------------------------------     -------------------
<S>                                    <C>                                      <C>
AIM Global Consumer Products and
  Services Fund......................  0.975% of the first $500 million;          $  182,949,344
                                       0.95% on the next $500 million;
                                       0.925% on the next $500 million; and
                                       0.90% on amounts thereafter.
AIM Global Financial Services Fund...  0.975% of the first $500 million;          $  100,032,253
                                       0.95% on the next $500 million;
                                       0.925% on the next $500 million; and
                                       0.90% on amounts thereafter.
AIM Global Health Care Fund..........  0.975% of the first $500 million;          $  528,559,525
                                       0.95% on the next $500 million;
                                       0.925% on the next $500 million; and
                                       0.90% on amounts thereafter.
AIM Global Infrastructure Fund.......  0.975% of the first $500 million;          $   84,011,067
                                       0.95% on the next $500 million;
                                       0.925% on the next $500 million; and
                                       0.90% on amounts thereafter.
AIM Global Resources Fund............  0.975% of the first $500 million;          $   92,848,358
                                       0.95% on the next $500 million;
                                       0.925% on the next $500 million; and
                                       0.90% on amounts thereafter.
AIM Global Telecommunications and
  Technology Fund....................  0.975% of the first $500 million;          $1,621,328,699
                                       0.95% on the next $500 million;
                                       0.925% on the next $500 million; and
                                       0.90% on amounts thereafter.
AIM International Equity Fund........  0.95% of the first $1 billion;             $2,456,329,774
                                       0.90% on amounts thereafter.
AIM Global Growth Fund...............  0.85% of the first $1 billion;             $  475,584,904
                                       0.80% on amounts thereafter.
AIM Global Aggressive Growth Fund....  0.90% of the first $1 billion;             $2,309,012,837
                                       0.85% on amounts thereafter.
</TABLE>

                                       B-1
<PAGE>   24
                                                                       EXHIBIT C

                             OWNERSHIP OF THE FUND

     Listed below is the name, address and percent ownership of each person who
as of June 21, 1999, to the knowledge of the Trust's management, owned
beneficially 5 percent or more of the outstanding shares of any class of the
Fund:

<TABLE>
<CAPTION>
                                                                              PERCENT
                                                               NUMBER OF     BENEFICIAL
                      NAME AND ADDRESS                        SHARES OWNED   OWNERSHIP
                      ----------------                        ------------   ----------
<S>                                                           <C>            <C>
Class C
Salomon Smith Barney Inc.
333 West 34th Street, 3rd Floor
New York, New York 10001....................................    1,742.526       7.68%

ITC Cust IRA FBO
Edward Clark
2198 Lake Marie Drive
Santa Maria, CA 93455.......................................    1,210.640       5.34%

ITC Cust FBO
Brian E. Crist Roth IRA Conv.
P.O. Box 1360
Arroyo Grande, CA 93421.....................................    1,184.880       5.22%

Advisor Class
LGT Asset Management 401(k) Plan
11 Greenway Plaza, Suite 100
Houston, TX 77046...........................................   60,957.390      81.54%

LGT Asset Management SERP Plan
11 Greenway Plaza, Suite 100
Houston, TX 77046...........................................   10,227.844      13.68%
</TABLE>

                                       C-1
<PAGE>   25
                     EVERY SHAREHOLDER'S VOTE IS IMPORTANT!









                        PLEASE SIGN, DATE AND RETURN YOUR
                                  PROXY TODAY!

                  Please detach at perforation before mailing.
- --------------------------------------------------------------------------------
PROXY              PROXY SOLICITED BY THE BOARD OF TRUSTEES OF             PROXY
                             AIM GLOBAL TRENDS FUND
               (THE SOLE INVESTMENT PORTFOLIO OF AIM SERIES TRUST)

            PROXY FOR SPECIAL MEETING OF SHAREHOLDERS AUGUST 25, 1999

The undersigned hereby appoints Samuel D. Sirko 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 AIM Global Trends Fund, the sole investment portfolio of AIM Series
Trust, on August 25, 1999 at 3:00 p.m., Central time, and at any adjournment
thereof, all of the shares of the Fund 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" THE APPROVAL OF EACH PROPOSAL.

                                        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.


                                        ----------------------------------------
CONTROL NUMBER:                         Signature


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

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


                            (Please see reverse side)




<PAGE>   26




                     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 [__]


<TABLE>
<CAPTION>

                                                                                     FOR   AGAINST   ABSTAIN


<S>      <C>                                                                        <C>    <C>      <C>
         1.    To approve a new investment advisory agreement for AIM Global
               Trends Fund.                                                          [ ]      [ ]       [ ]

         2.    To approve changes to the fundamental investment restrictions of
               the Fund.

               (A)  The modification of the fundamental restriction on
                    concentration.                                                   [ ]      [ ]       [ ]

               (B)  The modification of the fundamental restriction on portfolio
                    diversification.                                                 [ ]      [ ]       [ ]

               (C)  The addition of a fundamental policy on investments in
                    investment companies.                                            [ ]      [ ]       [ ]

               (D)  The modification of the fundamental restriction on issuing
                    senior securities and borrowing money.                           [ ]      [ ]       [ ]

               (E)  The modification of the fundamental restriction on
                    underwriting securities.                                         [ ]      [ ]       [ ]

               (F)  The modification of the fundamental restriction on real
                    estate investments.                                              [ ]      [ ]       [ ]

               (G)  The modification of the fundamental restriction on making
                    loans.                                                           [ ]      [ ]       [ ]

                                                                                     FOR    WITHHOLD
                                                                                            AUTHORITY

         3.    To elect Robert H. Graham as Trustee.                                 [ ]      [ ]       [ ]

                                                                                     FOR    AGAINST   ABSTAIN

                                                                                     [ ]      [ ]       [ ]
         4.    To ratify the selection of PricewaterhouseCoopers LLP as
               independent public accountants.

         5.    IN THE DISCRETION OF SUCH PROXIES, UPON SUCH OTHER BUSINESS AS
               MAY PROPERLY COME BEFORE THE SPECIAL MEETING OR ANY ADJOURNMENT
               THEREOF.
</TABLE>






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