CBSH · Commerce Bancshares, Inc.

Paul A. Steiner informed the Company of his decision to resign from his position as Corporate Controller and Chief Accounting Officer on March 24, 2026. The filing explicitly states that his decision is not the result of any disagreement with the Company regarding its finances, accounting, operations, policies, or practices. To facilitate a smooth handover, Mr. Steiner will remain with Commerce Bancshares, Inc. until July 7, 2026. Steven A. Brandjord has been named as the successor. Mr. Brandjord joined the Company in 2014 and currently serves as Assistant Controller and Director of Tax; he previously served as Tax Manager III. Prior to joining the Company, he was a Senior Manager in the tax area for BKD, LLP. His appointment as Corporate Controller and Chief Accounting Officer is effective May 2026, following Board approval. In connection with this promotion, Mr. Brandjord will receive an equity grant of approximately 2,100 restricted stock units, vesting over a four-year period.