WILLIAM PENN BANCORPORATION 10 CANAL STREET, SUITE 104 BRISTOL, PENNSYLVANIA 19007 NOTICE OF SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON APRIL 2, 2025 TO THE SHAREHOLDERS OF WILLIAM PENN BANCORPORATION NOTICE IS HEREBY GIVEN that a special meeting of shareholders of William Penn Bancorporation, or William Penn, will be held at William Penn’s corporate office located at 10 Canal Street, Suite 104, Bristol, Pennsylvania 19007 at 9:00 AM, Eastern Time, on April 2, 2025, to consider and vote on: 1. a proposal to approve and adopt the Agreement and Plan of Merger, dated October 31, 2024, by and between Mid Penn Bancorp, Inc., or Mid Penn, and William Penn, which provides for, among other things, the merger of William Penn with and into Mid Penn (the “William Penn merger proposal”); and 2. a proposal to authorize the board of directors to adjourn the William Penn special meeting, if necessary, to solicit additional proxies, in the event there are not sufficient votes at the time of the William Penn special meeting to approve the William Penn merger proposal (the “William Penn adjournment proposal”). We have fixed January 31, 2025 as the record date for determining those William 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 William Penn and its shareholders and unanimously recommends that you vote “FOR” the William Penn merger proposal and “FOR” the William Penn adjournment proposal. In accordance with the terms of the merger agreement, each director and executive officer of William Penn has agreed to vote all shares of William 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 approval and adoption of the merger agreement and the transactions contemplated thereby. We urge you to vote as soon as possible so that your shares will be represented. Your vote is very important, regardless of the number of shares of William Penn common stock that you own. We cannot complete the merger unless the affirmative vote of at least a majority of the votes entitled to vote on such proposal at the William Penn special meeting is voted to approve and adopt the William Penn merger proposal. 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), William 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 the Internet prior to the special meeting to ensure that your shares of William 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 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, your shares of William Penn common stock will not be counted and will have the same effect as a vote “AGAINST” the approval and adoption of the merger agreement.
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