X0508 4 2026-03-04 0000946673 BANNER CORP BANR 0001187861 PURCELL CYNTHIA D 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 3382 60.87 A 46406 D Common Stock, $0.01 par value per share 2026-03-04 4 F 0 1397 60.87 D 45009 D This award for 4,699 performance shares was originally reported on April 3, 2023 at the maximum performance criteria. This supplements that filing to note 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. Includes direct ownership of 4 shares through Deferred Compensation Plan, and 1,099 shares through 401(k) Plan. Shares relinquished to cover tax obligations on vesting of 3,382 shares of restricted stock pursuant to 2018 Omnibus Incentive Plan. /s/ Richard C. Arnold, attorney-in-fact for Ms. Purcell 2026-03-05