Common Share

Columbia Banking System, Inc. (COLB) announced its Board of Directors has approved a quarterly cash dividend of $0.36 per common share. The dividend is payable on September 15, 2025, to shareholders of record as of August 29, 2025. Columbia Bank, a leading regional bank in the Western U.S. with over $50 billion in assets, rebranded from Umpqua Bank on July 1, 2025, and fully operates under the new name as of September 1, 2025.