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: # 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 - --------------------------- ------------ ------------- ------------ ------------ Thomas Rutledge............ 49,662 49,662 0 * David Magee................ 63,624 63,624 0 * Timothy Smith.............. 428 428 0 *