Columbia Banking System(COLB) - 2024 Q4 - Annual Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended: December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 for the transition period from to . Commission file number: 000-20288 COLUMBIA BANKING SYSTEM, INC. (Exact name of registrant as specified in its charter) of Incorporation or Organization) Washington 91-1 ...