X0508 4 2026-03-04 0000946673 BANNER CORP BANR 0001979865 Harrison Karen 10 SOUTH FIRST AVENUE WALLA WALLA WA 99362 1 Executive VP, Banner Bank 0 Common Stock, $0.01 par value per share 2026-03-04 4 A 0 923 60.87 A 9290 D Common Stock, $0.01 par value per share 2026-03-04 4 F 0 348 60.87 D 8942 D This award for 1,284 performance shares was originally reported on April 3, 2023 at the maximum performance criteria. This supplements that filing to note that the actual number of shares that vested based on the performance results as determined by Banner Corporation's Compensation Committee. Market price on March 4, 2026. Shares relinquished to cover tax obligations on vesting of 923 shares of restricted stock pursuant to the 2018 Omnibus Incentive Plan. /s/ Richard C. Arnold, attorney-in-fact for Ms. Harrison 2026-03-05