<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
(the "Portfolios")
Supplement dated March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
The address under the heading "How to Buy Shares -- Directly from the Fund
by mail" on page 43 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
<PAGE>
The address under the heading "How to Sell Shares -- By mail" on page 44 of
the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<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 March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
The address under the heading "How to Buy Shares -- Directly from the Fund
by mail" on page 18 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
<PAGE>
The address under the heading "How to Sell Shares -- By mail" on page 19 of
the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<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 March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA. As a
result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
The address under the heading "How to Sell Shares" in the second paragraph
on page 15 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
<PAGE>
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<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 March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
The address under the heading "How to Buy Shares -- Directly from the Fund
by mail" on page 26 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
<PAGE>
The address under the heading "How to Sell Shares -- By mail" on page 27 of
the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<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 March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
The address under the heading "How to Buy Shares -- Directly from the Fund
by mail" on page 29 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
<PAGE>
The address under the heading "How to Sell Shares -- By mail" on page 30 of
the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<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 March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to
each Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
<PAGE>
The address under the heading "How to Sell Shares" in the second paragraph
on page 52 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<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 March 3, 2000
to Prospectus dated March 31, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
<PAGE>
The address under the heading "How to Sell Shares" in the second paragraph
on page 67 of the prospectus is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
-2-
<PAGE>
CONNING MONEY MARKET PORTFOLIO
of
Mercantile Mutual Funds, Inc.
(the "Company")
Supplement dated March 3, 2000
to Prospectus dated November 6, 1999
Merger of Mississippi Valley Advisors Inc. into Firstar Investment Research and
Management Company, LLC
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA. As a
result of this transaction, FIRMCO became the investment adviser to each
Portfolio. FIRMCO is the investment counseling subsidiary of Firstar
Corporation, a banking and financial services organization. At December 31,
1999, FIRMCO managed approximately $35.3 billion in assets. Prior to September
17, 1999, MVA was an indirect wholly-owned subsidiary of Mercantile
Bancorporation Inc.
Change in Transfer Agent and Related Address Change
On March 20, 2000, Firstar Mutual Fund Services, LLC will replace BISYS
Fund Services Ohio, Inc. as the Company's transfer agent. Effective on that
date, as a result of that change, the address to which investors should submit
orders to buy shares, requests to sell shares and requests for other information
will change as set forth below.
The address for shareholder inquiries on the back cover of the prospectus
is changed to:
Mercantile Mutual Funds, Inc.
Conning Money Market Portfolio
615 East Michigan Street
P.O. Box 3011
Milwaukee, WI 53201-3011
<PAGE>
MERCANTILE MUTUAL FUNDS, INC.
Statement of Additional Information
for
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
International Equity Portfolio
Supplement dated March 3, 2000
to the Statement of Additional Information dated March 31, 1999
Merger of Mississippi Valley Advisor Inc. into Firstar Investment Research and
Management Company, LLC
The first paragraph under the heading "Investment Advisory and Sub-Advisory
Agreements" on page 96 is deleted and the following paragraph is added:
On September 17, 1999, Mercantile Bancorporation Inc. was merged
into Firstar Corporation as a result of which Mississippi Valley Advisors
Inc., ("MVA"), the Portfolios' investment adviser, became a subsidiary of
Firstar Corporation. On March 1, 2000, Firstar Investment Research and
Management Company, LLC ("FIRMCO") acquired all of the assets and
liabilities of MVA. As a result of this transaction, FIRMCO became the
investment adviser to each Portfolio. FIRMCO is the investment counseling
subsidiary of Firstar Corporation, a banking and financial services
organization. At December 31, 1999, FIRMCO managed approximately $35.3
billion in assets. Prior to September 17, 1999, MVA was an indirect wholly-
owned subsidiary of Mercantile Bancorporation Inc.
Addition of Co-Administrator
<PAGE>
The first sentence under the heading "Administrator" on page 100 is
deleted and the following sentences are added:
Effective January 1, 2000, BISYS Fund Services Ohio, Inc., ("BISYS")
located at 3435 Stelzer Road, Columbus, Ohio 43219 and Firstar Mutual Fund
Services, LLC located at 615 E. Michigan Street, Milwaukee, WI 53202, serve
as the Portfolios' co-administrators. Prior to January 1, 2000, BISYS
served as the sole administrator to the Portfolios.
Change of Transfer Agent and Dividend Disbursing Agent
The third and four sentence under the heading "Custodian, Sub-Custodian and
Transfer Agent" on page 104 is deleted and the following sentence is added:
On March 20, 2000, Firstar Mutual Fund Services, LLC, with principal
offices at 615 E. Michigan Street, Milwaukee, WI, 53202, will replace BISYS
Fund Services Ohio, Inc., as the Company's transfer agent and dividend
disbursing agent.
-2-
<PAGE>
CONNING MONEY MARKET PORTFOLIO
of
Mercantile Mutual Funds, Inc.
(the "Company")
Supplement dated March 3, 2000
to Statement of Additional Information dated November 6, 1999
Merger of Mississippi Valley Advisor Inc. into Firstar Investment Research and
Management Company, LLC
The first sentence under the heading "Investment Adviser and Sub-Adviser"
on page 24 is deleted and the following paragraph is added:
On September 17, 1999, Mercantile Bancorporation Inc. was merged into
Firstar Corporation as a result of which Mississippi Valley Advisors Inc.,
("MVA"), the Portfolios' investment adviser, became a subsidiary of Firstar
Corporation. On March 1, 2000, Firstar Investment Research and Management
Company, LLC ("FIRMCO") acquired all of the assets and liabilities of MVA.
As a result of this transaction, FIRMCO became the investment adviser to
each Portfolio. FIRMCO (the "Adviser") is the investment counseling
subsidiary of Firstar Corporation, a banking and financial services
organization. At December 31, 1999, FIRMCO managed approximately $35.3
billion in assets. Prior to September 17, 1999, MVA was an indirect
wholly-owned subsidiary of Mercantile Bancorporation Inc.
Addition of Co-Administrator
The first sentence under the heading "Administrator" on page 25 is deleted
and the following sentences are added:
Effective January 1, 2000, BISYS Fund Services Ohio, Inc., ("BISYS")
located at 3435 Stelzer Road, Columbus, Ohio 43219 and Firstar Mutual Fund
Services, LLC located at 615 E. Michigan Street, Milwaukee, WI 53202, serve
as the Portfolios' co-administrators. Prior to January 1, 2000, BISYS
served as the sole administrator to the Portfolios.
Change of Transfer Agent and Dividend Disbursing Agent
The second and third sentences under the heading "Custodian and Transfer
Agent" on page 27 is deleted and the following sentence is added:
On March 20, 2000, Firstar Mutual Fund Services, LLC, with principal
offices at 615 E. Michigan Street, Milwaukee, WI, 53202, will replace BISYS
Fund Services Ohio, Inc., as the Company's transfer agent and dividend
disbursing agent.
