EX-32 16 colb-20230331xex32.htm CERTIFICATION OF CEO, CFO, AND PAO
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 quarterly report on Form 10-Q for the period ended March 31, 2023 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
| President and Chief Executive Officer
| Columbia Banking System, Inc.
| /s/ Ronald L. Farnsworth
| Ronald L. Farnsworth
| Executive Vice President/Chief Financial Officer and
| Principal Financial Officer
| Columbia Banking System, Inc.
| /s/ Lisa M. White
| Lisa M. White
| Executive Vice President/Corporate Controller and
| Principal Accounting Officer
| Columbia Banking System, Inc.
| May 9, 2023