ABOUT THIS JOINT PROXY STATEMENT/PROSPECTUS This document, which forms part of a registration statement on Form S-4 filed with the SEC by Mid Penn (File No. 333-284342), constitutes a prospectus of Mid Penn under the Securities Act of 1933, as amended, which we refer to as the “Securities Act,” with respect to the shares of common stock, par value $1.00 per share, of Mid Penn, which we refer to as “Mid Penn common stock,” to be issued pursuant to the Agreement and Plan of Merger, dated as of October 31, 2024, by and between Mid Penn and William Penn, which we refer to as the “merger agreement.” This document also constitutes a proxy statement of Mid Penn and William Penn under the Securities Exchange Act of 1934, which we refer to as the “Exchange Act.” It also constitutes a notice of meeting with respect to the special meetings, at which each of Mid Penn and William Penn shareholders will be asked to vote on proposals necessary to complete the merger. Mid Penn has supplied all information contained or incorporated by reference into this joint proxy statement/prospectus relating to Mid Penn, and William Penn has supplied all information contained or incorporated by reference into this joint proxy statement/prospectus relating to William Penn. ii
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