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Exhibit 32 

CERTIFICATION OF 

CHIEF EXECUTIVE OFFICER, PRINCIPAL FINANCIAL OFFICER AND PRINCIPAL ACCOUNTING OFFICER UNDER SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 

This certification is given by the undersigned Chief Executive Officer, Principal Financial Officer and Principal Accounting Officer of Columbia Banking System, Inc. (the “registrant”) pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Each of the undersigned hereby certifies, with respect to the registrant's annual report on Form 10-K for the period ended December 31, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the registrant

			/s/ Clint E. Stein
			Clint E. Stein
			Chair, President, and Chief Executive Officer
			Columbia Banking System, Inc.
			/s/ Ivan A. Seda
			Ivan A. Seda
			Executive Vice President, Chief Financial Officer and Principal Financial Officer
			Columbia Banking System, Inc.
			/s/ Brock M. Lakely
			Brock M. Lakely
			Executive Vice President, Chief Accounting Officer and Principal Accounting Officer
			Columbia Banking System, Inc.
			February 26, 2026