Key facts
- This page summarizes Pershing Square Capital Management, L.P.'s Form 4 filing for Seaport Entertainment Group Inc. (SEG).
- 2 reported transactions and 0 derivative rows are listed below.
- Accepted by SEC: 23 Apr 2026, 20:23.
Pershing Square Capital Management, L.P. - 21 Apr 2026 Form 4 Insider Report for Seaport Entertainment Group Inc. (SEG)
- Reporting relationship
- Director, 10%+ Owner
- Issuer ticker
- SEG
- Reported as of
- 21 Apr 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 23 Apr 2026, 20:23:36 UTC
- Prior SEC filing
- 07 May 2025
- Next SEC filing
- 28 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- PERSHING SQUARE CAPITAL MANAGEMENT, L.P., By: /s/ William A. Ackman, Authorized Signatory
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Pershing Square Capital Management, L.P. filed Form 4 for Seaport Entertainment Group Inc. (SEG) on 23 Apr 2026.
Change
- Previous filing in this sequence was filed on 07 May 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (5)
CIK 0001336528
Primary reporting owner
Pershing Square Capital Management, L.P.
- Relationship
- Director, 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- PERSHING SQUARE CAPITAL MANAGEMENT, L.P., By: /s/ William A. Ackman, Authorized Signatory
- Signature date
- 23 Apr 2026
CIK 0002026053
PERSHING SQUARE INC.
- Relationship
- Director, 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- PERSHING SQUARE HOLDCO, L.P., By: Pershing Square Holdco GP, LLC, its General Partner, By: /s/ William A. Ackman, Authorized Signatory
- Signature date
- 23 Apr 2026
CIK 0002027508
Pershing Square Holdco GP, LLC
- Relationship
- Director, 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- PERSHING SQUARE HOLDCO GP, LLC, By: /s/ William A. Ackman, Authorized Signatory
- Signature date
- 23 Apr 2026
CIK 0002027456
Pershing Square Management, LLC
- Relationship
- Director, 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- PERSHING SQUARE MANAGEMENT, LLC, By: /s/ William A. Ackman, Member and Chief Executive Officer
- Signature date
- 23 Apr 2026
CIK 0001056513
ACKMAN WILLIAM A
- Relationship
- Director, 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- /s/ William A. Ackman
- Signature date
- 23 Apr 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- -90,875
- Change %
- -1.8%
- Price
- $22.25*
- Shares after
- 4,932,905
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F7
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- -90,875
- Change %
- -1.8%
- Price
- $22.25*
- Shares after
- 4,932,905
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F7
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- -90,875
- Change %
- -1.8%
- Price
- $22.25*
- Shares after
- 4,932,905
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F7
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- -90,875
- Change %
- -1.8%
- Price
- $22.25*
- Shares after
- 4,932,905
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F7
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- -90,875
- Change %
- -1.8%
- Price
- $22.25*
- Shares after
- 4,932,905
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F7
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- +90,875
- Change %
- Price
- $22.25*
- Shares after
- 90,875
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F8
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- +90,875
- Change %
- Price
- $22.25*
- Shares after
- 90,875
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F8
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- +90,875
- Change %
- Price
- $22.25*
- Shares after
- 90,875
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F8
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- +90,875
- Change %
- Price
- $22.25*
- Shares after
- 90,875
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F8
SEG
transaction
Common Stock, par value $0.01 per share
Other
- Transaction value
- Shares
- +90,875
- Change %
- Price
- $22.25*
- Shares after
- 90,875
- Date
- 21 Apr 2026
- Ownership
- See Footnotes
- Footnotes
- F1, F2, F3, F4, F5, F6, F8
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 8 footnotes
Footnote F1
Reflects a transfer of the Subject Securities (as defined below) from PSLP (as defined below) to PS Redemption, L.P. ("RedemptionCo"), which was formed for the purpose of giving effect to the special redemption of certain limited partner interests of PSLP in connection with a special redemption opportunity that was consummated on April 21, 2026.
Footnote F2
The closing price of the Issuer's Common Stock on April 21, 2026.
Footnote F3
In addition to Pershing Square Capital Management, L.P., a Delaware limited partnership ("PSCM"), this Form 4 is being filed jointly by Pershing Square Holdco, L.P., a Delaware limited partnership ("PS Holdco"), Pershing Square Holdco GP, LLC, a Delaware limited liability company ("PS Holdco GP"), Pershing Square Management, LLC, a Delaware limited liability company ("ManagementCo"), and William A. Ackman, a citizen of the United States of America (collectively, the "Reporting Persons"), each of whom has the same business address as PSCM and may be deemed to beneficially own the securities reported on this Form 4 (the "Subject Securities").
Footnote F4
PSCM advises the accounts of Pershing Square, L.P., a Delaware limited partnership ("PSLP"), Pershing Square International, Ltd., a Cayman Islands exempted company ("PSI"), and Pershing Square Holdings, Ltd., a limited liability company incorporated in Guernsey ("PSH" and together with PSLP and PSI, the "Pershing Square Affiliated Funds") and RedemptionCo.
Footnote F5
(A) PSCM, as the investment adviser to the Pershing Square Affiliated Funds and RedemptionCo, (B) PS Holdco, as the indirect 100% holding company of PSCM, (C) PS Holdco GP, as the sole general partner of PS Holdco and (D) ManagementCo, as the sole member of PS Holdco GP, may each be deemed to be the beneficial owner of the Subject Securities for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934 (the "Exchange Act"). By virtue of Mr. Ackman's position as (i) the Chief Executive Officer of PSCM, (ii) a director of PS Holdco GP and (iii) a member of ManagementCo, Mr. Ackman may be deemed to be the beneficial owner of the Subject Securities for purposes of Rule 16a-1(a) under the Exchange Act. Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any pecuniary interest therein.
Footnote F6
Anthony F. Massaro, a member of the board of directors of the Issuer of the Subject Securities, was appointed to that board as a representative of PSCM, the other Reporting Persons and the Pershing Square Affiliated Funds. As a result, each of those persons are directors by deputization for purposes of Section 16 of the Exchange Act.
Footnote F7
These Subject Securities are held by the Pershing Square Affiliated Funds.
Footnote F8
These Subject Securities are held by RedemptionCo.