<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Trust Shares
of the
Treasury Money Market Portfolio
Money Market Portfolio
Tax-Exempt Money Market Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Trust Shares and Trust II Shares
of the
Treasury Money Market Portfolio, Money Market
Portfolio, Tax-Exempt Money Market Portfolio,
U.S. Government Securities Portfolio, Intermediate
Corporate Bond Portfolio, Bond Index Portfolio,
Government & Corporate Bond Portfolio,
Short-Intermediate Municipal Portfolio, Missouri
Tax-Exempt Bond Portfolio, National Municipal Bond
Portfolio, Balanced Portfolio, Equity Income Portfolio,
Equity Index Portfolio, Growth & Income Equity
Portfolio, Growth Equity Portfolio, Small Cap Equity
Portfolio, Small Cap Equity Index Portfolio and
International Equity Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Institutional Shares
of the
Treasury Money Market Portfolio, Money Market Portfolio,
U.S. Government Securities Portfolio, Intermediate Corporate
Bond Portfolio, Bond Index Portfolio, Government
& Corporate Bond Portfolio, Balanced Portfolio,
Equity Income Portfolio, Equity Index Portfolio,
Growth & Income Equity Portfolio, Growth Equity
Portfolio, Small Cap Equity Portfolio,
Small Cap Equity Index Portfolio and
International Equity Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Investor Shares
of the
Treasury Money Market Portfolio
Money Market Portfolio
Tax-Exempt Money Market Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Investor Shares
of the
Short-Intermediate Municipal Portfolio
Missouri Tax-Exempt Bond Portfolio
National Municipal Bond Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Investor Shares
of the
U.S. Government Securities Portfolio
Intermediate Corporate Bond Portfolio
Bond Index Portfolio
Government & Corporate Bond Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
(the "Company")
Investor Shares
of the
Balanced Portfolio
Equity Income Portfolio
Equity Index Portfolio
Growth & Income Equity Portfolio
Growth Equity Portfolio
Small Cap Equity Portfolio
Small Cap Equity Index Portfolio
International Equity Portfolio
Supplement dated August 16, 1999
to Prospectus dated March 31, 1999
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
<PAGE>
CONNING MONEY MARKET PORTFOLIO
of
Mercantile Mutual Funds, Inc.
(the "Company")
Supplement dated August 16, 1999
to Prospectus dated January 19, 1999
(as revised March 31, 1999)
Merger of Mercantile Bancorporation Inc. and Firstar Corporation
Mercantile Bancorporation Inc. ("Mercantile") and Firstar Corporation
("Firstar") have entered into an Agreement and Plan of Merger dated as of April
30, 1999, as amended June 17, 1999, which provides for the merger of these two
bank holding companies. The Agreement and Plan of Merger and the transactions
contemplated thereby, including the merger of Mercantile with and into Firstar,
were approved by shareholders of Mercantile and Firstar at special meetings of
shareholders held on July 28, 1999. The merger is expected to be completed on
or about September 17, 1999.
As a result of the merger, Mississippi Valley Advisors Inc. ("MVA"), the
Company's investment adviser and currently an indirect wholly owned subsidiary
of Mercantile, will become an indirect wholly owned subsidiary of Firstar. MVA
will continue to serve as the Company's investment adviser following the
merger.
Firstar is a Wisconsin corporation with a principal office at Firstar Center,
777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202. At March 31, 1999,
Firstar had consolidated total assets of approximately $38 billion.
