<PAGE>
Pursuant to Rule 424(B)(3)
Registration No. 333-75735
SUNGARD/R/ DATA SYSTEMS INC.
SUPPLEMENT DATED JULY 16, 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 item regarding Carl LaGrassa
is 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>
Carl LaGrassa................................... 5,393,998 5,120,916 273,082 *
Bollinger, Wells, Lett & Co. Inc. .............. 67,642 67,642 0 *
</TABLE>
