COLUMBIA MID CAP GROWTH FUND, INC.
                                  (THE "FUND")


                 SUPPLEMENT TO THE CLASS Z, T AND G PROSPECTUSES


The "Investment Goal" section of the prospectus has been amended as follows:

"The Fund seeks significant capital appreciation by investing, under normal
market conditions, at least 80% of its net assets (plus any borrowings for
investment purposes) in stocks of companies with a market capitalization, at the
time of initial purchase, equal to or less than the largest stock in the Russell
Midcap Index."


The "Principal Investment Strategies" section of the prospectus has been amended
by revising the first paragraph and adding a second paragraph as follows:

"In achieving its investment objective, the Fund will focus on growth stocks.
The Fund may also invest up to 20% of its net assets in small and large-cap
companies, as compared to the Russell Midcap Index, when the advisor believes
they offer comparable capital appreciation opportunities or to stabilize the
portfolio.

The Fund may invest in special situations such as initial public offerings
(IPOs); companies that may benefit from technological or product developments or
new management; and companies involved in tender offers, leveraged buy-outs or
mergers."







240-36/945P-1003                                                October 13, 2003