X0306 4 2023-03-07 0000946673 BANNER CORP BANR 0001231641 GRESCOVICH MARK J 10 SOUTH FIRST AVE. WALLA WALLA WA 99362 1 President and CEO Common Stock, $0.01 par value per share 2023-03-07 4 A 0 23477 62.01 A 189237 D Common Stock, $0.01 par value per share 2023-03-07 4 F 0 5715 62.01 D 183522 D This award for 27,949 performance shares was originally reported on March 27, 2020 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 7, 2023. Shares relinquished to cover tax obligations on vesting of 23,477 performance shares pursuant to 2018 Omnibus Incentive Plan. /s/ Mark J. Grescovich 2023-03-09