<PAGE>
RULE 424(b)(3)
Registration No. 33-75737
SUNGARD(R) DATA SYSTEMS INC.
SUPPLEMENT DATED SEPTEMBER 30, 1999
TO
PROSPECTUS DATED APRIL 16, 1999
This supplement provides new and additional information beyond that contained in
the Prospectus and should be retained and read in conjunction with such
Prospectus.
Under the caption "SELLING STOCKHOLDERS" the line items regarding Thomas
Rutledge and David Magee are amended and restated as follows:
<TABLE>
<CAPTION>
# of Shares # of Shares # of Shares % of Shares
Owned Before Being Offered Owned After Owned After
Name of Selling Stockholder the Offering For Sale the Offering the Offering
- --------------------------- ------------ ------------- ------------ ------------
<S> <C> <C> <C> <C>
Thomas Rutledge............ 49,662 49,662 0 *
David Magee................ 63,624 63,624 0 *
Timothy Smith.............. 428 428 0 *
</TABLE>
