Insider Transactions for COLUMBIA BANKING SYSTEM, INC.

On March 13, 2026, Namdar Frank, EVP Chief Credit Officer of COLUMBIA BANKING SYSTEM, INC. (COLB), reported several transactions. Frank acquired 2,820 shares of common stock through the conversion of Restricted Stock Units (RSUs) with a price of $0.00 per share. Concurrently, Frank disposed of 2,820 shares of common stock acquired through RSUs. Frank also acquired 2820 shares of common stock and disposed of 1367 shares of common stock at a price of $26.23 per share. Following these transactions, Frank directly holds 33,290 shares and indirectly holds 4,179 shares through a 401(k) plan. The RSUs granted on February 25, 2025, vest in three annual installments starting March 13, 2026, and convert into common stock on a one-for-one basis.