Insider Transaction Report for Andrew H. Ognall

Andrew H. Ognall, EVP Chief Risk Officer of COLUMBIA BANKING SYSTEM, INC. (COLB), reported a series of transactions on March 13, 2026. He acquired 2,381 shares of Common Stock at $26.23 per share, and subsequently disposed of 951 shares of Common Stock at the same price. Additionally, Ognall disposed of 2,381 Restricted Stock Units (RSUs) which converted to Common Stock on a one-for-one basis. These RSUs were granted on February 25, 2025, and vest in three annual installments starting March 13, 2026. Following these transactions, Ognall directly holds 74,132 shares of Common Stock. He also has 2,635 shares held indirectly in a 401(k) account.