Tranche Update on Commerce Bancshares, Inc.'s Equity Buyback Plan announced on October 21, 2005.

Commerce Bancshares, Inc. is a bank holding company of Commerce Bank (the Bank). The Bank is engaged in the general banking business, providing a range of retail, mortgage banking, corporate, investment, trust, and asset management products and services. It operates over 257 locations in Missouri, Kansas, Illinois, Oklahoma and Colorado. The Company's segments include Commercial, Consumer and Wealth. The Commercial segment offers corporate lending, merchant and commercial bank card products, payment solutions, leasing, and international services, as well as business and government deposit, investment, institutional brokerage and others. The Consumer segment includes the retail branch network, consumer installment lending, personal mortgage banking, and consumer debit and credit bank card activities. The Wealth segment provides traditional trust and estate planning services, consumer brokerage services, and advisory and discretionary investment portfolio management services.