Exhibit 21 Subsidiaries of the Registrant State of Name under which Subsidiary does Business Incorporation Accurate Data On-Line Corp. Florida Aspen Investment Alliance, Inc. Colorado BMS On-Line Services, Inc. Maine BMS Management Services, Inc. Maine BankLink, Inc. New York Cadre, Inc. Connecticut Data Link Systems, Inc. Indiana FIserv Atlanta, Inc. Georgia FIserv Basis, Inc. Georgia FIserv Boston, Inc. Massachusetts FIserv CIR, Inc. Delaware Citizens Financial Corporation d/b/a FIserv Cleveland, Inc. Ohio FIserv Data Pro Card Services, Inc. Indiana FIserv Des Moines, Inc. Iowa FIserv EFT, Inc. Oregon FIserv Federal Systems, Inc. Delaware FIserv Financial Systems, Inc. Texas FIserv Financial Systems of Florida, Inc. Florida FIserv Fresno, Inc. California FIserv Government Services, Inc. Delaware FIserv Joint Venture, Inc. Delaware FIserv Minneapolis, Inc. Minnesota FIserv New Haven, Inc. Connecticut FIserv Pittsburgh, Inc. Pennsylvania FIserv St. Paul, Inc. Minnesota FIserv San Diego, Inc. California FIserv Seattle, Inc. Washington Fiserv Solutions, Inc. Wisconsin FIserv Spokane, Inc. Washington FIserv Tampa, Inc. Florida FIserv (Europe) Ltd. United Kingdom FIserv (ASPAC) Pte., Ltd. Singapore First Retirement Marketing, Inc. Colorado First Trust Corporation Colorado Information Technology, Inc. Nebraska Integrated Business Systems California Lincoln Trust Company Colorado Lincoln Retirement Services, Inc. California LT Securities Colorado National Embossing Company Texas NewFit Co. Iowa Sendero Corporation Arizona Sendero (ASPAC) Pte. Ltd. Singapore SRS, Inc. Texas Summit Information Systems Corp. Oregon The Affinity Group, Inc. Colorado