Form 4 Filing for Mark J. Grescovich

Mark J. Grescovich, President and CEO of Banner Corp (BANR), reported the disposition of 1094 shares of common stock on April 2, 2026. The shares were relinquished to cover tax obligations arising from the vesting of 2,778 restricted shares granted under the 2018 Omnibus Incentive Plan. The disposition occurred at a price of $60.86 per share, with the market price on the transaction date being $60.86. Following this transaction, Mr. Grescovich holds 269,252 shares of Banner Corp stock directly. The filing was signed by Richard C. Arnold as attorney-in-fact for Mr. Grescovich on April 3, 2026.