HOW TO OBTAIN ADDITIONAL INFORMATION This joint proxy statement/prospectus incorporates by reference important business and financial information about Mid Penn and William Penn that is not included in or delivered with this document. You can obtain free copies of this information through the SEC website at https://www.sec.gov. You will also be able to obtain these documents, free of charge, from Mid Penn at www.midpennbank.com, under the heading “SEC Filings” or from William Penn by accessing William Penn’s website at www.williampenn.bank, under the heading “Investor Relations.” You can also obtain free copies of this information by writing or calling: Mid Penn Bancorp, Inc. 2407 Park Drive Harrisburg, Pennsylvania 17110 Attention: Investor Relations (866) 642-7736 William Penn Bancorporation 10 Canal Street, Suite 104 Bristol, Pennsylvania 19007 Attention: Jonathan T. Logan (267) 540-8500 You will not be charged for any of these documents that you request. In order to obtain timely delivery of the documents, you must request the information no later than five business days before the date of the applicable special meeting. Therefore, you must request the information no later than March 26, 2025, with respect to Mid Penn information, and no later than March 26, 2025 with respect to William Penn information. If you are a shareholder of William Penn and have questions about the merger or the special meeting of William Penn, would like additional copies of this document or proxy cards, or need any other information related to the proxy solicitations, you may also contact Alliance Advisors at (833) 215-7310. For a more detailed description of the information incorporated by reference in this joint proxy statement/ prospectus and how you may obtain it, see the section entitled “Where You Can Find More Information” on page 129 and “Incorporation of Certain Documents by Reference” on page 130. All information concerning Mid Penn and its subsidiaries has been furnished by Mid Penn, and all information concerning William Penn and its subsidiaries has been furnished by William Penn. You should rely only on the information contained or incorporated by reference in this joint proxy statement/prospectus when evaluating the merger agreement and the proposed merger. We have not authorized anyone to provide you with information that is different from what is contained in this joint proxy statement/prospectus. This joint proxy statement/prospectus is dated February 7, 2025. You should not assume that the information contained in this joint proxy statement/prospectus is accurate as of any date other than such date. Further, you should not assume that the information incorporated by reference into this joint proxy statement/prospectus is accurate as of any date other than the date of the incorporated document. Neither the mailing of this joint proxy statement/prospectus nor the issuance of shares of Mid Penn common stock as contemplated by the merger agreement shall create any implication to the contrary. This joint proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities or the solicitation of a proxy, in any jurisdiction in which or from any person to whom it is not lawful to make any such offer or solicitation in such jurisdiction. i
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