X0306 4 2022-10-05 0 0000798354 FISERV INC FISV 0001654667 Chiarello Guy 255 FISERV DRIVE BROOKFIELD WI 53045 0 1 0 0 Chief Operating Officer Common Stock 2022-10-05 4 S 0 4000 100.00 D 228553 D Common Stock 26118 I By Trust Common Stock 37381 I By Trust This sale was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for estate and financial planning purposes. Held by The Guy Chiarello 2020 Trust for the benefit of the reporting person's spouse and children and of which the reporting person's spouse serves as trustee and the reporting person serves as investment advisor. Held by The Denise Chiarello 2021 Trust for the benefit of the reporting person and the reporting person's children and of which the reporting person serves as trustee. /s/ Eric C. Nelson (attorney-in-fact) 2022-10-06