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Bill Ackman's Seaport Entertainment Group Inc. (SEG) position

Yes: as of Q1 2026, Bill Ackman holds 5.0M shares of SEG worth an amount we cannot price (0.8% of the disclosed portfolio). Last quarter the position was unchanged. First disclosed Q3 2024.
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Current value
an amount we cannot price
Shares held
5.0M
% of portfolio
0.8%
Quarter-end price
No quarter-end price available

Average buy price is hidden here because at least one covered purchase quarter has no usable local mean price.

SEG price vs Ackman's position

Dates
$25.5$26$26.5$27← Earlier —2 purchases
Average closing price · filing quarter
Price range · filing quarter

Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
No change · Q1 2025–Q1 2026 (5 quarters)
No change 5.0M
Q4 2024 Added +2.9M +139.8% 5.0M Feb 14, 2025
Q3 2024 New +2.1M 2.1M Nov 14, 2024
Data through Q1 2025–Q1 2026 · filed –
3 grouped rows from 7 quarters

Who else owns SEG

Kahn Brothers Group Inc

owns 7.0% of shares outstanding
Shares: 893K

Gate City Capital Management, LLC

owns 5.4% of shares outstanding
Shares: 689K

Rubric Capital Management LP

owns 4.4% of shares outstanding
Shares: 569K

Dimensional

owns 3.6% of shares outstanding
Shares: 455K

See all owners of SEG →

More Ackman positions

Common questions

Does Bill Ackman own SEG?

Yes. As of Q1 2026, Bill Ackman disclosed 5.0M shares of SEG, worth an amount we cannot price. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Bill Ackman buy SEG?

Bill Ackman first disclosed a SEG position in Q3 2024; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Bill Ackman sell SEG?

The quarter-by-quarter table above shows each sale and reduction Bill Ackman disclosed in SEG. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of SEG does Bill Ackman own?

Bill Ackman disclosed 5.0M shares of SEG as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Bill Ackman pay for SEG?

Bill Ackman began building the SEG position before our 13F history starts, so an exact average buy price cannot be estimated without understating it. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.