Banner : 2026 Proxy Statement Voting Card

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MMMMMMMMMMMM MMMMMMMMM ENDORSEMENT_LINE SACKPACK 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext C123456789 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000001 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. Your vote matters - here's how to vote! You may vote online or by phone instead of mailing this card. If no electronic voting, delete QR code and control # Online Go to https://www.investorvote.com/BANR or scan the QR code - login details are located in the shaded bar below. Phone Call toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada Save paper, time and money! Sign up for electronic delivery at https://www.investorvote.com/BANR 2026 Annual Meeting Proxy Card 1234 5678 9012 345 ▼ IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. ▼ The Board of Directors recommends a vote FOR all the nominees listed, and FOR Proposals 2 and 3. Proposals - The Board of Directors recommend a vote FOR all the nominees listed, FOR Proposals X - X and for every X YEARS on Proposal X. A Election of Directors: For Against Abstain For Against Abstain For Against Abstain - Ellen R.M. Boyer 04 - Mark J. Grescovich 07 - Monica B. O'Reilly 10 - Judith A. Steiner - Connie R. Collingsworth 05 - Roberto R. Herencia 08 - John C. Pedersen 11 - Millicent C. Tracey - Margot J. Copeland 06 - John R. Layman 09 - Kevin F. Riordan 12 - Paul J. Walsh Advisory approval of the compensation of Banner Corporation's named executive officers. For Against Abstain Ratification of the Audit Committee's appointment of Baker Tilly US, LLP as the independent registered public accounting firm for the year ending December 31, 2026. For Against Abstain Authorized Signatures - This section must be completed for your vote to count. Please date and sign below. B Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please give full title. Date (mm/dd/yyyy) - Please print date below. Signature 1 - Please keep signature within the box. Signature 2 - Please keep signature within the box. MMMMMMM C 1234567890 J N T 1 P C F 6 7 8 7 1 0 MR A SAMPLE (THIS AREA IS SET UP TO ACCOMMODATE 140 CHARACTERS) MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND 0496XB The 2026 Annual Meeting of Shareholders of Banner Corporation will be held on Wednesday, May 20, 2026 at 10:00 A.M. Pacific Time virtually via the Internet at https://meetnow.global/M4KQTQY To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. We encourage you to join the meeting prior to the start time. If you need further assistance, you may call 1-888-724-2416 (US) or 1-781-575-2748 (outside the US). Important notice regarding the Internet availability of proxy materials for the Annual Meeting of Shareholders. The material is available at: https://www.bannerbank.com/proxymaterials . Small steps make an impact. Help the environment by consenting to receive electronic delivery, sign up at https://www.investorvote.com/BANR ▼ IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. ▼ Banner Corporation - Revocable Proxy 2026 Annual Meeting of Shareholders Proxy Solicited by Board of Directors for Annual Meeting - May 20, 2026 The above-signed hereby appoints Roberto Herencia and Sherrey Luetjen, and each of them, with full powers of substitution to act as attorneys and proxies for the above-signed, to vote all shares of common stock of Banner Corporation ("Banner") which the above-signed is entitled to vote at the annual meeting of shareholders, to be held virtually on May 20, 2026, at 10:00 A.M., Pacific Time, and at any and all adjournments thereof, as indicated. This proxy also provides voting instructions to the Trustees of the Banner Corporation 401(k) Plan for participants with shares allocated to their accounts. This proxy will be voted as directed, but if no instructions are specified, this proxy will be voted FOR the election of our director nominees, and FOR Proposals 2 and 3. If any other business is presented at the annual meeting, this proxy will be voted by the proxies named above in their best judgment. At the present time, the Board of Directors knows of no other business to be presented at the annual meeting. This proxy also confers discretionary authority to the proxies named above to vote with respect to the election of any person as director where the nominees are unable to serve or for good cause will not serve, matters incident to the conduct of the annual meeting and such other business as may properly come before the meeting. Should the above-signed be virtually present and elect to vote at the annual meeting or at any adjournment thereof and after notification to the Secretary of Banner at the annual meeting of the shareholder's decision to terminate this proxy, then the power of said attorneys and proxies shall be deemed terminated and of no further force and effect. The above-signed acknowledges receipt from Banner prior to the execution of this proxy of the Notice of Annual Meeting of Shareholders, a Proxy Statement dated on or about April 6, 2026 and the 2025 Annual Report to Shareholders. (Items to be voted appear on reverse side) Non-Voting Items C Change of Address - Please print new address below. Comments - Please print your comments below.

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