ALLMERICA INVESTMENT TRUST
497, 2000-03-10
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                          ALLMERICA INVESTMENT TRUST
                 (SUPPLEMENT TO PROSPECTUS DATED MAY 1, 1999)

Effective April 1, 2000, TCW Investment Management Company ("TCW") will replace
Cambiar Investors, Inc. ("Cambiar") as Sub-Adviser of the Select Strategic
Growth Fund (the "Fund") of Allmerica Investment Trust (the "Trust").

TCW, a wholly-owned subsidiary of The TCW Group, Inc., a Nevada corporation, is
located at 865 South Figueroa Street, Suite 1800, Los Angeles, CA 90017. TCW is
a member of a group of companies which, as of December 31, 1999, had
approximately $70 billion in assets under management or committed to management.
Christopher J. Ainley, Douglas S. Foreman and Charles Larsen will have
responsibility for the day-to-day management of the Fund's investments. Mr.
Ainley, a Managing Director, joined TCW in 1994. Prior to joining TCW, Mr.
Ainley spent two years at Putnam Investments as a Vice President and Analyst in
the Equity Research Group and then as a Portfolio Manager for the Core Equity
Group. Mr. Foreman, Group Managing Director and Chief Investment Officer-U.S.
Equities and a Chartered Financial Analyst, joined TCW in 1994. Prior to joining
TCW, Mr. Foreman was employed by Putnam Investments where he spent his last five
years managing institutional accounts and mutual funds. Mr. Larsen, Managing
Director, and a Chartered Financial Analyst and Chartered Investment Counselor,
joined TCW in 1984. Prior to joining TCW, Mr. Larsen was a Senior Vice President
and Portfolio Manager for CIGNA Investment Management Company.

At a meeting on February 15, 2000, the Board of Trustees of the Trust approved a
Sub-Adviser Agreement (the "New Sub-Adviser Agreement") between Allmerica
Financial Investment Management Services, Inc., the investment manager of the
Trust (the "Manager"), and TCW. Under the New Sub-Adviser Agreement, the Manager
will pay TCW a fee computed daily and paid quarterly at an annual rate of 0.85%
based on the average daily net assets of the Fund of up to $100 million. When
the average daily net assets of the Fund exceed $100 million, TCW will receive a
fee computed daily and paid quarterly at an annual rate of 0.75% of the total
average daily net assets of the Fund. Under the current Sub-Adviser Agreement
with Cambiar (the "Current Sub-Adviser Agreement"), the Manager pays Cambiar a
fee computed daily and paid quarterly at an annual rate of the average daily net
assets of the Fund as set forth below:

            Net Assets                                       Fee
            ----------                                       ---
            First $50 Million..............................  0.50%
            Next $100 Million..............................  0.45%
            Next $100 Million..............................  0.35%
            Next $100 Million..............................  0.30%
            Over $350 Million..............................  0.25%

The other terms of the New Sub-Adviser Agreement are substantially the same as
those of the Current Sub-Adviser Agreement. Since the Manager is responsible for
the payment of all sub-adviser fees, the level of sub-adviser fees has no impact
on the operating expenses of the Fund. There is no change in the investment
management fee paid by the fund to the Manager.

In addition, effective April 1, 2000, the Fund's current investment objective,
principal investment strategies and principal risks will be replaced with the
following:

Investment Objective: The Fund seeks long-term capital appreciation.

Principal Investment Strategies: To pursue its investment objective, the Fund
invests (except when maintaining a temporary defensive position) at least 65% of
the value of its total assets in equity securities issued by companies with
market capitalization, at the time of acquisition by the Fund, within the
capitalization range of the companies comprising the Standard & Poor's Small Cap
600 Index.

In managing the Fund's investments, the Sub-Adviser pursues a small cap growth
investment philosophy. The Sub-Adviser uses fundamental company-by-company
analysis in conjunction with technical and quantitative market analysis to
screen potential investments and to continuously monitor securities in the
Fund's portfolio.

The Fund focuses on small, fast-growing companies that offer cutting-edge
products, services or technologies. Because these companies are often in their
early stages of development, their stocks tend to fluctuate more than most other
securities. The Fund may invest up to 25% of its assets in foreign securities
(not including its investments in American Depositary Receipts).

Principal Risks:

     .  Company Risk
     .  Currency Risk
     .  Derivatives Risk
     .  Foreign Investment Risk
     .  Investment Management Risk
     .  Liquidity Risk
     .  Market Risk

Dated:  March 7, 2000
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                                 [LETTERHEAD]

                                    March 10, 2000

VIA EDGAR

Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street N.W.
Washington, D.C. 20549

Attn:  Office of Filings, Information and Consumer Services

Re:    Allmerica Investment Trust
       File No. 002-94067, 811-4138, CIK#0000756742

Dear Sir/Madam:

Pursuant to Rule 497(e) under the Securities Act of 1933, as amended, I am
forwarding a copy of a "sticker" dated March 7, 2000 supplementing Allmerica
Investment Trust's Version E Prospectus dated May 1, 1999

Please return an electronic transmittal as evidence of your receipt of this
filing. If you have any questions regarding this filing, please call me at
(508) 855-4013.

                                       Sincerely,

                                       /s/ George M. Boyd

                                       George M. Boyd, Esquire
                                       Secretary

Enclosure

cc: Laraina M. Fleurant - S380
    Paul T. Kane - S298
    Sheila St. Hilaire, Esquire - N440
    Gregory D. Sheehan, Esquire




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