Columbia Banking System Announces CFO Transition

Ronald Farnsworth, Executive Vice President, CFO, to Step Down

Ivan Seda, Deputy CFO, Appointed CFO, Effective December 31, 2025

TACOMA, Wash., Oct. 30, 2025 /PRNewswire/ -- Columbia Banking System, Inc. ("Columbia") (Nasdaq: COLB), the parent company of Columbia Bank, today announced that Ronald Farnsworth will step down as Executive Vice President, Chief Financial Officer, effective December 31, 2025. Farnsworth has served as Columbia's Chief Financial Officer since March 2023 and previously served as Executive Vice President, Chief Financial Officer of Umpqua Holdings Corporation and Umpqua Bank from 2008 until its merger with Columbia in 2023. Farnsworth will serve as an advisor to the Company through June 1, 2026, to ensure a smooth transition.

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