Merchants Bancorp — Additional Proxy Materials (DEFA14A)

www.investorvote.com/MBIN Step 1: Go to www.investorvote.com/MBIN. 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. Online Go to www.investorvote.com/MBIN or scan the QR code — login details are located in the shaded bar below. Shareholder Meeting Notice Important Notice Regarding the Availability of Proxy Materials for the Merchants Bancorp Meeting to be Held on May 21, 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 Proxy Card and Notice are available at: 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 11, 2026 to facilitate timely delivery. Easy Online Access — View your proxy materials and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. Votes submitted electronically must be received by May 21, 2026 at 1:00 A.M., Eastern Time.

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/MBIN. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to investorvote@computershare.com with “Proxy Materials Merchants Bancorp” 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 11, 2026. Merchants Bancorp’s Annual Meeting of Shareholders will be held on Thursday, May 21, 2026 Merchants Bancorp Headquarters 410 Monon Blvd., Carmel, Indiana 46032 at 8:00 A.M., Eastern Time. 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 nominees listed, and FOR Proposals 2 and 3. 1. Election of Directors: 01 - Michael F. Petrie 02 - Tamika D. Catchings 03 - Michael S. Curless 04 - Thomas W. Dinwiddie 05 - Michael J. Dunlap 06 - Scott A. Evans 07 - Andrew A. Juster 08 - Julia L. Kaercher 09 - Patrick D. O’Brien 10 - Randall D. Rogers, Jr. 11 - Anne E. Sellers 12 - Mark E. Shaffer 2. A non-binding, advisory vote on the compensation of the Company’s Named Executive Officers. 3. The ratification of the appointment of Forvis Mazars, LLP as the Company’s 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. If you wish to attend and vote at the meeting, please bring this notice with you. Shareholder Meeting Notice