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 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 Ohio d/b/a FIserv Cleveland, Inc. FIserv Data Pro Card Services, Inc. Indiana FIserv Dayton, Inc. Delaware FIserv Des Moines, Inc. Iowa American Data Services, Inc. Oregon d/b/a FIserv EFT, Inc. 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 Spokane, Inc. Washington FIserv Tampa, Inc. Florida FIserv (UK), Ltd. United Kingdom FIserv (ASPAC) Pte., Ltd. Singapore First Retirement Marketing, Inc. Colorado First Trust Corporation Colorado Performance Analysis, Inc. Ohio National Embossing Company Texas Sendero Corporation Arizona Sendero (ASPAC) Pte., Ltd. Singapore Summit Information Systems Corp. Oregon The Affinity Group, Inc. Colorado