<PAGE>
The Munder Funds
Supplement Dated December 2, 1999
to Prospectus Dated October 26, 1999
Class A, B and C Shares of:
The Munder Index 500 Fund
The section entitled "Distribution Arrangements-Sales Charge Waivers-Qualified
Employer Sponsored Retirement Plans-Qualified Sponsored Retirement Plans and
UPI Plans" in the prospectus is hereby deleted and replaced with the following:
Qualified Sponsored Retirement Plans and UPI Plans. We will waive the initial
sales charge on Class A Shares of the Fund for all investments by: (i) employer
sponsored retirement plans that are qualified under Section 401(a) or Section
403(b) of the Code; (ii) employees participating in an employer-sponsored or
administered retirement program operating under Section 408A of the Code and
(iii) UPI Plans.
In addition, the CDSC of up to 0.20% imposed on certain redemptions of Class A
Shares of the Fund within one year of purchase will be waived for such
accounts. The distributor will pay the following commissions to dealers and
other entities (as permitted by applicable Federal and state law) who initiate
and are responsible for purchases of Class A Shares of the Fund by such
accounts:
<TABLE>
<CAPTION>
Discount to Dealer or Entity
Amount Of Purchase as a % of Offering Price
- ------------------ ----------------------------
<S> <C>
Less than $1,000,000.......................... 0.15%
$1,000,000 but less than $3,000,000........... 0.10%
$3,000,000 but less than $5,000,000........... 0.05%
$5,000,000 or more............................ None
</TABLE>
SUPPROINXABC1299
