SEC Form DEFA14A filed by Seaport Entertainment Group Inc.

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Your Vote Counts! Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V96304-P51547 SEAPORT ENTERTAINMENT GROUP INC. 199 WATER STREET NEW YORK, NY 10038 SEAPORT ENTERTAINMENT GROUP INC. 2026 Annual Meeting Vote by June 7, 2026 11:59 PM ET You invested in SEAPORT ENTERTAINMENT GROUP INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 8, 2026. Vote Virtually at the Meeting* June 8, 2026 10:00 AM ET Virtually at: www.virtualshareholdermeeting.com/SEG2026 *Please check the meeting materials for any special requirements for meeting attendance. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 25, 2026. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. Voting Items Board Recommends V96305-P51547 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. Election of directors to serve until the Company’s 2027 annual meeting of stockholders and until their successors are duly elected and qualified. For Nominees: 01) Matthew M. Partridge 02) Michael A. Crawford 03) Monica S. Digilio 04) David Z. Hirsh 05) Anthony F. Massaro 2. Ratification of the appointment of Grant Thornton LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026. For Note: In their discretion, the proxies are authorized to vote upon such other matters that may properly come before the meeting and any adjournments or postponements thereof.