<PAGE>
The Munder Funds
Supplement Dated March 23, 2000
to Prospectus Dated October 26, 1999
Class Y Shares of:
Munder Balanced Fund, Munder Focus Growth Fund (formerly Munder Equity
Selection Fund), Munder Equity Income Fund (formerly Munder Growth & Income
Fund), Munder Future Technology Fund, Munder Growth Opportunities Fund, Munder
International Equity Fund, Munder Micro-Cap Equity Fund, Munder Multi-Season
Growth Fund, Munder NetNet Fund, Munder Real Estate Equity Investment Fund,
Munder Small-Cap Value Fund, Munder Small Company Growth Fund, Munder Value
Fund, Munder Framlington Emerging Markets Fund, Munder Framlington Global
Financial Services Fund, Munder Framlington Healthcare Fund, Munder
Framlington International Growth Fund, Munder Bond Fund, Munder Intermediate
Bond Fund, Munder International Bond Fund, Munder U.S. Government Income Fund,
Munder Michigan Tax-Free Bond Fund, Munder Tax-Free Bond Fund, Munder Tax-Free
Short-Intermediate Bond Fund, Munder Short Term Treasury Fund, Munder Cash
Investment Fund, Munder Money Market Fund, Munder Tax-Free Money Market Fund
and Munder U.S. Treasury Money Market Fund
CLOSING OF NETNET FUND
The Board of Directors of the NetNet Fund has determined that it is in the
best interest of shareholders to close the Fund to new accounts. Accordingly,
as of April 17, 2000, the NetNet Fund will only accept orders for the
additional purchase of Fund shares by shareholders into accounts with existing
NetNet Fund positions.
SUPPROY32300