X0508 4 2024-03-01 0000946673 BANNER CORP BANR 0001231641 GRESCOVICH MARK J 10 SOUTH FIRST AVE. WALLA WALLA WA 99362 1 President and CEO 0 Common Stock, $0.01 par value per share 2024-03-01 4 A 0 13812 44.10 A 204564 D Common Stock, $0.01 par value per share 2024-03-01 4 F 0 3362 44.10 D 201202 D This award for 16,314 performance shares was originally reported on March 26, 2021 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 1, 2024. Shares relinquished to cover tax obligation on vesting of 13,812 shares of restricted stock pursuant to 2018 Omnibus Incentive Plan. /s/ Mark J. Grescovich 2024-03-04