X0508 4 2024-03-01 0000946673 BANNER CORP BANR 0001187861 PURCELL CYNTHIA D 10 SOUTH FIRST AVE WALLA WALLA WA 99362 1 Executive VP, Banner Bank 0 Common Stock, $0.01 par value per share 2024-03-01 4 A 0 3370 44.10 A 36814 D Common Stock, $0.01 par value per share 2024-03-01 4 F 0 1422 44.10 D 35392 D This award for 3,982 performance shares was originally reported on March 26, 2021 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 1, 2024. Shares relinquished to cover tax obligations on vesting of 3,370 shares of restricted stock pursuant to 2018 Omnibus Incentive Plan. Includes direct ownership of 4 shares through Deferred Compensation Plan 1,099 shares through 401(k) Plan. /s/ Cynthia D. Purcell 2024-03-04