X0508 4 2026-02-26 0002009684 Seaport Entertainment Group Inc. SEG 0001663789 PARTRIDGE MATTHEW MORRIS 199 WATER STREET 28TH FLOOR NEW YORK NY 10038 true true false false Chief Executive Officer 0 Common Stock 2026-02-26 4 A 0 27625 0 A 123259 D Non-Qualified Stock Option (Right to Buy) 21.72 2026-02-26 4 A 0 55148 0 A 2036-02-26 Common Stock 55148 55148 D Represents restricted stock units ("RSUs") granted to the Reporting Person pursuant to Seaport Entertainment Group Inc.'s (the "Issuer") 2024 Equity Incentive Plan (the "Plan"). Each RSU represents a contingent right to receive one share of the Issuer's common stock. The RSUs vest in three substantially equal annual installments beginning on February 27, 2027, subject to the Reporting Person's continued service with the Issuer or its subsidiaries through such date. The options vest in four substantially equal annual installments beginning on February 26, 2027, subject to the Reporting Person's continued service with the Issuer or its subsidiaries through such date. /s/ Lucy Fato, Attorney-in-Fact 2026-03-02