Ackman Retains Stake in Seaport Entertainment

Pershing Square retains its stake in Seaport Entertainment Group Inc. (NYSE:SEG) as of Q4 2025, holding 5.02 million shares worth over $99 million, representing 0.64% of Bill Ackman's portfolio and 40% of institutional ownership. The stock is up more than 15% year-to-date through March 5, 2026; on February 23, 2026 the company announced plans to open a Tin Building Balloon Museum with Lux Entertainment in summer 2026 to boost foot traffic and diversify revenue.