ST. LOUIS--(BUSINESS WIRE)--July 10, 2006--Cass Information Systems, Inc. (NASDAQ: CASS) is now part of the Russell 2000(R) Index, which reconstituted June 30, 2006. Making the announcement was Eric H. Brunngraber, CASS president and chief operating officer.

Annual reconstitution of the Russell 3000 captures the 3,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization. The largest 1,000 companies in the ranking comprise the Russell 1000(R) Index while the remaining 2,000 companies become the Russell 2000(R) Index. Final index membership remains in place for one year.

The reconstitution process is followed closely by many investors because the Russell indexes currently have $3.8 trillion in assets benchmarked to them and account for an industry-leading 54% of all institutional investment products that use a benchmark.

St. Louis, Mo.-based Cass Information Systems is the leading provider of transportation, utility and telecom invoice payment and information services. The company, which has been involved in the payables services and information support business since 1956, disburses over $16 billion annually on behalf of customers from processing centers in St. Louis, Columbus, Ohio, Boston, Mass. and Greenville, S.C. The support of Cass Commercial Bank, founded in 1906, makes Cass Information Systems unique in the industry.

Russell Investment Group, a global leader in multi-manager investment services, provides investment products and services in 44 countries. Russell manages more than $167 billion in assets and advises clients worldwide representing more than $2.4 trillion. Founded in 1936, Russell is a subsidiary of Northwestern Mutual and is headquartered in Tacoma, Wash., with additional offices in New York, Toronto, London, Paris, Singapore, Sydney, Auckland and Tokyo.

Editor's note: Cass Information Systems, Inc. makes its headquarters at 13001 Hollenberg Dr. in Bridgeton, Mo. 63044.

    CONTACT: Casey Communications, Inc.
             Kenn Entringer, 314-721-2828
             kentringer@caseycomm.com

    SOURCE: Cass Information Systems