MID PENN BANCORP, INC. 2407 PARK DRIVE HARRISBURG, PENNSYLVANIA 17110 NOTICE OF SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON APRIL 2, 2025 TO THE SHAREHOLDERS OF MID PENN BANCORP, INC.: NOTICE IS HEREBY GIVEN that a special meeting of shareholders of Mid Penn Bancorp, Inc., or Mid Penn, will be held virtually at 9:00 AM, Eastern Time, on April 2, 2025, to consider and vote on: 1. a proposal to approve the issuance by Mid Penn of shares of Mid Penn common stock to holders of common stock of William Penn Bancorporation, or William Penn, as contemplated by the Agreement and Plan of Merger, dated October 31, 2024, by and between Mid Penn and William Penn (the “Mid Penn share issuance proposal”); and 2. a proposal to authorize the board of directors to adjourn the special meeting, if necessary, to solicit additional proxies, in the event there are not sufficient votes at the time of the special meeting to approve the Mid Penn share issuance proposal (the “Mid Penn adjournment proposal”). These items are described in more detail in the accompanying joint proxy statement/prospectus and its annexes. You should read these documents in their entirety before voting. We have fixed January 31, 2025 as the record date for determining those Mid Penn shareholders entitled to vote at the special meeting. Accordingly, only shareholders of record at the close of business on that date are entitled to notice of and to vote at the special meeting or any adjournment or postponement of the meeting. Your board of directors has unanimously determined that the proposed merger is advisable and in the best interests of Mid Penn and its shareholders and unanimously recommends that you vote “FOR” the Mid Penn share issuance proposal and “FOR” the Mid Penn adjournment proposal. In accordance with the terms of the merger agreement, each director and executive officer of Mid Penn has agreed to vote all shares of Mid Penn common stock owned by him or her, and that he or she has the sole power to vote or direct the voting thereof, in favor of the Mid Penn share issuance proposal. Your vote is very important, regardless of the number of shares of Mid Penn common stock that you own. We cannot complete the merger unless the issuance of shares of Mid Penn common stock in connection with the merger is approved by a majority of the votes cast at the Mid Penn special meeting. Even if you plan to attend the special meeting (information regarding how you can attend and participate in the special meeting is included in the proxy card), Mid Penn requests that you complete, sign, date and return, as promptly as possible, the enclosed proxy card in the accompanying prepaid reply envelope or submit your proxy by telephone or Internet prior to the special meeting to ensure that your shares of Mid Penn common stock will be represented at the special meeting. If you hold your shares in “street name” through a bank, brokerage firm or other nominee, you should follow the procedures provided by your bank, brokerage firm or other nominee to vote your shares. If you fail to submit a proxy or to virtually attend the special meeting and vote or do not provide your bank, brokerage firm or other nominee with instructions as to how to vote your shares, as applicable, your shares of Mid Penn common stock will not be counted. We urge you to vote as soon as possible so that your shares will be represented.
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