<PAGE>
FIRST INVESTORS SERIES FUND
SUPPLEMENT DATED DECEMBER 2, 1997
TO PROSPECTUS DATED APRIL 30, 1997
1. The following should be added to the end of the second paragraph on page 1
and the first paragraph under "Investment Objectives and Policies-Blue Chip
Fund" on page 9:
It is the Fund's policy to remain relatively fully invested in equity securities
under all market conditions rather than to attempt to time the market by
maintaining large cash or fixed-income securities positions when market declines
are anticipated. The Fund is appropriate for investors who are comfortable with
a fully invested stock portfolio.
2. Since late May 1997, the INVESTMENT GRADE FUND has been co-managed by Ms.
Nancy Jones and Mr. Clark D. Wagner. The biographical information for both Ms.
Jones and Mr. Wagner is in the Prospectus under "Management-Portfolio Managers"
on page 27.
FISF697