Richmond Mutual Bancorporation, Inc.

proxy statement of Richmond Mutual and Farmers Bancorp and a prospectus of Richmond Mutual, which will be distributed to the shareholders of Richmond Mutual and Farmers Bancorp in connection with their votes on the merger of Farmers Bancorp with and into Richmond Mutual and the issuance of Richmond Mutual common stock in the proposed transaction. INVESTORS AND SECURITY HOLDERS ARE ENCOURAGED TO READ THE REGISTRATION STATEMENT AND JOINT PROXY STATEMENT/PROSPECTUS WHEN THEY BECOME AVAILABLE (AND ANY OTHER DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE PROPOSED TRANSACTION OR INCORPORATED BY REFERENCE INTO THE JOINT PROXY STATEMENT/PROSPECTUS) BECAUSE SUCH DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION REGARDING THE PROPOSED MERGER AND RELATED MATTERS. Investors and security holders will be able to obtain free copies of the registration statement on Form S-4 and the related proxy statement/prospectus, when filed, as well as other documents filed with the SEC by Richmond Mutual through the web site maintained by the SEC at www.sec.gov. These documents, when available, also can be obtained free of charge by accessing the Richmond Mutual’s website at www.firstbankrichmond.com under the tab “Investor Relations” and then under “SEC Filings.” Alternatively, these documents, when filed with the SEC by Richmond Mutual, can be obtained free of charge by (1) writing Richmond Mutual at 31 North 9th Street, Richmond, Indiana 47374, Attn: Bradley Glover or by calling (765) 962-2581; or (2) writing Farmers Bancorp at 9 East Clinton Street, Frankfort, Indiana 46041, Attn: Chad Kozuch, or by calling (765) 654-8731. Participants in the Solicitation The directors, executive officers and certain other members of management and employees of Richmond Mutual may be deemed to be participants in the solicitation of proxies from the shareholders of Richmond Mutual in connection with the proposed transaction. Information about Richmond Mutual’s directors and executive officers is included in the proxy statement for its 2025