RIVERVIEW BANCORP INC — Proxy Solicitation & Information Statement 2026

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Under Rule 14a-12

RIVERVIEW BANCORP, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required.

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # T02287-P54599 RIVERVIEW BANCORP, INC. 900 WASHINGTON STREET SUITE 900 VANCOUVER, WASHINGTON 98660-3409 Your Vote Counts! RIVERVIEW BANCORP, INC. 2026 Annual Meeting For shares held directly, vote by August 26, 2026 11:59 PM ET. For shares held in the Riverview 401(k) or ESOP Plans, vote by August 22, 2026 11:59 PM ET. You invested in RIVERVIEW BANCORP, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on August 27, 2026. Get informed before you vote View the Notice of Annual Meeting of Shareholders, Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to August 13, 2026. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote Virtually at the Meeting August 27, 2026 10:00 A.M. Virtually at: www.virtualshareholdermeeting.com/RVSB2026

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. Voting Items Board Recommends T02288-P54599 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. Election of Directors For Nominees: Three-year term 01) Bess R. Wills 02) Larry A. Hoff One-year term 03) Jon L. Griod 04) Kourosh N. Zamanizadeh 2. Advisory (non-binding) vote to approve the compensation paid to our named executive officers. For 3. Approval of the adoption of the Riverview Bancorp, Inc. 2026 Stock Purchase Plan. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof.