ACNB CORP

proxy statement of TRBK and ACNB and a prospectus of ACNB. The definitive joint proxy statement/prospectus has been sent to the shareholders of TRBK and ACNB, respectively, seeking the required shareholder approvals. Before making any voting or investment decision, investors and security holders are urged to read the registration statement and joint proxy statement/prospectus and other relevant documents filed with the SEC because they contain important information about ACNB, TRBK, and the transaction. Investors and security holders may obtain free copies of these documents through the website maintained by the SEC at http://www.sec.gov. Investors and security holders may also obtain free copies of these documents by directing a request by mail or telephone to ACNB Corporation at 16 Lincoln Square, P.O. Box 3129, Gettysburg, PA 17325 or (717) 339-5161, or by directing a request by mail or telephone to Traditions Bancorp, Inc. at 226 Pauline Drive, York, PA 17402 or (717)-747-2600. ACNB, TRBK, and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the shareholders of TRBK and ACNB, respectively, in connection with the merger. Information about the directors and executive officers of TRBK and ACNB and their ownership of TRBK and ACNB common stock may be obtained by reading the joint proxy statement/prospectus regarding the merger. Additional information regarding the interests of these participants and other persons who may be deemed participants in the merger may be obtained by reading the joint proxy statement/prospectus regarding the merger. ACNB #2024-18 November 12, 2024