COMMERCE BANK PSU GORILLA CARD TEXTBOOK SWEEPSTAKES

Winner receives $500 bookstore gift certificate

(Pittsburg, KS – October 27, 2009) – Jeremy Kaufman of Hesston, KS has won a $500 Commerce Bank gift certificate for the University Bookstore in the Overman Student Center in the Commerce Bank “PSU Gorilla Card Textbook” Sweepstakes. The 22-year old is a student at Pittsburg State University, where he is majoring in Construction Management with an emphasis in Company Management.

Participants in the sweepstakes were entered to win by answering online questions about the special Pittsburg State University Gorilla Card on the microsite of the Commerce Bank website and completing a register-to-win form online at www.commercebank.com/gorillacard. The winner was drawn on October 1, 2009.

“Commerce Bank sponsored this promotion to help students learn about the functions of their Pittsburg State University Gorilla Card, including the ability to pay for their purchases at the University Bookstore, on campus, and at thousands of retailers nationwide,” said Brian Sutton, President of Commerce Bank, Pittsburg. “College students like Jeremy find that it’s an easy and convenient way to make purchases. We are happy to award Jeremy the $500 bookstore gift certificate.”

“I enter all contests. You can’t win if you don’t enter,” Jeremy said.

The Commerce Bank branch on the campus of Pittsburg State University opened in May 2006. It is a full-service branch serving the students, staff and faculty of Pittsburg State University.

About Commerce Bank

Commerce Bank, N.A. is a subsidiary of Commerce Bancshares, Inc. (NASDAQ: CBSH), an $18 billion regional bank holding company. For more than 140 years, Commerce Bank has been meeting the financial services needs of individuals and businesses. Commerce Bank provides a diversified line of financial services, including business and personal banking, wealth management and estate planning and investments through its subsidiary and affiliated companies. Commerce Bank currently operates in approximately 350 locations in Missouri, Kansas, Illinois, Oklahoma and Colorado. Commerce Bancshares also has operating subsidiaries involved in mortgage banking, leasing, credit-related insurance, venture capital and real estate activities.

For additional information contact:

Email: mymoney@commercebank.com†