Banner : 2026 Notice and Access Card

About this update from Banner Corporation

MMMMMMMMM ENDORSEMENT_LINE SACKPACK MMMMMMMMMMMM MMMMMMM C 1234567890 000001 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 Online Go to https://www.investorvote.com/BANR or scan the QR code - login details are located in the shaded bar below. Shareholder Meeting Notice 1234 5678 9012 345 Important Notice Regarding the Availability of Proxy Materials for the Banner Corporation Shareholder Meeting to be Held on May 20, 2026 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual shareholders' meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The 2026 Proxy Statement and 2025 Annual Report to Shareholders are available at: www.bannerbank.com/proxymaterials Easy Online Access - View your proxy materials and vote. Step 1: Go to www.investorvote.com/BANR. Step 2: Click on the icon on the right to view meeting materials. Step 3: Return to the investorvote.com window and follow the instructions on the screen to log in. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials - If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May 6, 2026 to facilitate timely delivery. 2 N O T C O Y 0496ZB Shareholder Meeting Notice Banner Corporation's Annual Meeting of Shareholders will be held on Wednesday, May 20, 2026 at 10:00 A.M. Pacific Time virtually via the Internet at https://meetnow.global/M4KQTQY. Proposals to be voted on at the meeting are listed below along with the Board of Directors' recommendations. The Board of Directors recommends a vote FOR all the nominees listed, and FOR Proposals 2 and 3. Election of Directors: 01 - Ellen R.M. Boyer 02 - Connie R. Collingsworth 03 - Margot J. Copeland 04 - Mark J. Grescovich 05 - Roberto R. Herencia 06 - John R. Layman 07 - Monica B. O'Reilly 08 - John C. Pedersen 09 - Kevin F. Riordan - Judith A. Steiner - Millicent C. Tracey - Paul J. Walsh Advisory approval of the compensation of Banner Corporation's named executive officers 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 PLEASE NOTE - YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Here's how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. Internet - Go to www.investorvote.com/BANR. Phone - Call us free of charge at 1-866-641-4276. Email - Send an email to [email protected] with "Proxy Materials Banner Corporation" in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, requests for a paper copy of proxy materials must be received by May 6, 2026.

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