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Equibles

SEG

Seaport Entertainment Group Inc.

Company with tickers: SEG

CIK
2009684
CUSIP
812215200
Shares Outstanding
12,801,910
13F Activity (30d)
74 filings 68 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 119
Total Value: $230,711,371
Total Shares: 10,740,757
Showing 1–100 of 120 holdings by value · page 1 of 2

Institutional Ownership Trend

7 quarters

Superinvestors Holding SEG

All superinvestors →
Bill Ackman $107,910,794

Holder Concentration

Across 119 13F filers · Δ vs Dec 31, 2025
Top Holder
46.8%
Sep 2024 → Mar 2026 · range 42.3% – 78.9%
−1.6 pts
Top 5
71.5%
Sep 2024 → Mar 2026 · range 66.4% – 92.0%
+2.1 pts
Top 10
85.6%
Sep 2024 → Mar 2026 · range 82.3% – 97.8%
+1.7 pts
HHI
2,401
Sep 2024 → Mar 2026 · range 2,008 – 6,259
Moderately concentrated−106

Quarterly Activity

vs Dec 31, 2025
New
26
Increased
32
Decreased
33
Sold Out
20
Unchanged
28
Holder count: +6
Institutional value: +12.3%
Shares held: +3.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Small KAHN BROTHERS GROUP INC +307,057 893,227
Small GATE CITY CAPITAL MANAGEMENT, LLC +304,121 689,447
Large Cerity Partners LLC +61,697 318,919
Large RENAISSANCE TECHNOLOGIES LLC +45,500 82,300
Small O'Keefe Stevens Advisory, Inc. +33,499 47,670

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega UBS Group AG −97,471 24,460
Mega DIMENSIONAL FUND ADVISORS LP −64,751 455,147
Mid Ancora Advisors LLC −53,482 9
Large Focus Partners Wealth −49,482 596
Mega CITADEL ADVISORS LLC −43,540 36,400

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 327,685 $7,038,673
Small Peapod Lane Capital LLC 92,506 $1,987,028
Mega VANGUARD FIDUCIARY TRUST CO 48,264 $1,036,710
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 43,062 $924,971
Mega AQR CAPITAL MANAGEMENT LLC 23,230 $498,978

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 454,191 $8,979,354
Mid Alberta Investment Management Corp 66,352 $1,311,779
Mid Phoenix Financial Ltd. 50,000 $988,500
Large MARSHALL WACE, LLP 33,154 $655,454
Large LOS ANGELES CAPITAL MANAGEMENT LLC 18,170 $359,220
Filter: New 26 Increased 32 Reduced 33 Sold out 20 Unchanged 28
Showing 100 of 120
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Large Pershing Square Capital Management, L.P. $107,910,794 46.77% 5,023,780
Small KAHN BROTHERS GROUP INC $19,186,515 8.32% 893,227
Small GATE CITY CAPITAL MANAGEMENT, LLC $14,809,321 6.42% 689,447
Mid Rubric Capital Management LP $12,212,024 5.29% 568,530
Mega BlackRock, Inc. $10,860,908 4.71% 505,629
Mega DIMENSIONAL FUND ADVISORS LP $9,776,556 4.24% 455,147
Mega VANGUARD CAPITAL MANAGEMENT LLC $7,038,673 3.05% 327,685
Large Cerity Partners LLC $6,850,379 2.97% 318,919
Small Solas Capital Management, LLC $4,788,278 2.08% 222,918
Mega GEODE CAPITAL MANAGEMENT, LLC $3,974,229 1.72% 185,020
Mega STATE STREET CORP $3,823,031 1.66% 177,981
Small Rangeley Capital, LLC $3,297,545 1.43% 153,517
Mega GOLDMAN SACHS GROUP INC $2,238,129 0.97% 104,196
Small Peapod Lane Capital LLC $1,987,028 0.86% 92,506
Large RENAISSANCE TECHNOLOGIES LLC $1,767,804 0.77% 82,300
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $1,331,888 0.58% 62,006
Mega NORTHERN TRUST CORP Bank $1,227,645 0.53% 57,153
Mega LPL Financial LLC $1,133,413 0.49% 52,766
Mid HORIZON KINETICS ASSET MANAGEMENT LLC $1,126,411 0.49% 52,440
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,036,710 0.45% 48,264
Small O'Keefe Stevens Advisory, Inc. $1,023,951 0.44% 47,670
Large LAZARD ASSET MANAGEMENT LLC $1,019,612 0.44% 47,468
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $924,971 0.40% 43,062
Small Marnell Management LLC $693,804 0.30% 32,300
Small Gem Investment Advisors, LLC $638,772 0.28% 29,738
Mega CITADEL ADVISORS LLC $554,183 0.24% 25,800
Mega PRICE T ROWE ASSOCIATES INC /MD/ $550,983 0.24% 25,651
Mega UBS Group AG $525,399 0.23% 24,460
Large Quantinno Capital Management LP $518,548 0.22% 24,141
Mega AQR CAPITAL MANAGEMENT LLC $498,978 0.22% 23,230
Mid INGALLS & SNYDER LLC $475,438 0.21% 22,134
Mega Bank of New York Mellon Corp Bank $440,681 0.19% 20,516
Mid XTX Topco Ltd $418,408 0.18% 19,479
Mega PRINCIPAL FINANCIAL GROUP INC $395,445 0.17% 18,410
Mid ArrowMark Colorado Holdings LLC $395,360 0.17% 18,406
Large Trexquant Investment LP $377,403 0.16% 17,570
Large COMMERCE BANK Bank $377,124 0.16% 17,557
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $360,541 0.16% 16,785
Large State of New Jersey Common Pension Fund D Pension $341,338 0.15% 15,891
Large Tidal Investments LLC $340,479 0.15% 15,851
Mega MORGAN STANLEY $333,668 0.14% 15,534
Mega Nuveen, LLC $296,746 0.13% 13,815
Mid CITIZENS FINANCIAL GROUP INC/RI $250,456 0.11% 11,660
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $238,428 0.10% 11,100
Mid Moran Wealth Management, LLC $234,883 0.10% 10,935
Mega AMERICAN CENTURY COMPANIES INC $228,633 0.10% 10,644
Mega CITADEL ADVISORS LLC $227,688 0.10% 10,600
Small Odyssean, LLC $208,850 0.09% 9,723
Mega DEUTSCHE BANK AG\ Bank $180,861 0.08% 8,420
Small Byrne Asset Management LLC $135,753 0.06% 6,320
Mega RHUMBLINE ADVISERS $123,939 0.05% 5,770
Mega JPMORGAN CHASE & CO $115,001 0.05% 5,354
Mid Aquatic Capital Management LLC $112,039 0.05% 5,216
Large MetLife Investment Management, LLC $106,454 0.05% 4,956
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $77,091 0.03% 3,589
Mega Vanguard Global Advisers, LLC $64,289 0.03% 2,993
Mega WELLS FARGO & COMPANY/MN $64,180 0.03% 2,988
Large Police & Firemen's Retirement System of New Jersey Pension $37,310 0.02% 1,737
Mega BNP PARIBAS ARBITRAGE, SA $36,902 0.02% 1,718
Large CWM, LLC $34,196 0.01% 1,592
Mega BARCLAYS PLC $31,940 0.01% 1,487
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $31,231 0.01% 1,454
Large STRS OHIO $30,072 0.01% 1,400
Mid Tower Research Capital LLC (TRC) $28,439 0.01% 1,324
Small MSRH, LLC $26,935 0.01% 1,254
Large NISA INVESTMENT ADVISORS, LLC $25,776 0.01% 1,200
Small Hilltop National Bank Bank $21,759 0.01% 1,013
Mega FMR LLC $19,803 0.01% 922
Mid Ameritas Investment Partners, Inc. $16,367 0.01% 762
Large Russell Investments Group, Ltd. $14,561 0.01% 678
Mega Legal & General Group Plc $14,499 0.01% 675
Small Quent Capital, LLC $14,434 0.01% 672
Large Focus Partners Wealth $12,802 0.01% 596
Mega CITIGROUP INC $11,277 0.00% 525
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $8,656 0.00% 403
Small Versant Capital Management, Inc $7,174 0.00% 334
Small Essential Partners LLC $6,143 0.00% 286
Mid Sterling Capital Management LLC $5,305 0.00% 247
Mega ROYAL BANK OF CANADA Bank $4,637 0.00% 216
Mid Cullen/Frost Bankers, Inc. Bank $4,446 0.00% 207
Mid MONTAG A & ASSOCIATES INC $2,856 0.00% 133
Mid GAMMA Investing LLC $2,255 0.00% 105
Large ASSETMARK, INC $1,718 0.00% 80
Large JONES FINANCIAL COMPANIES LLLP $1,589 0.00% 74
Large NATIXIS $1,374 0.00% 64
Mid Leonteq Securities AG Broker-Dealer $945 0.00% 44
Mega PNC FINANCIAL SERVICES GROUP, INC. $943 0.00% 44
Small Costello Asset Management, INC $773 0.00% 36
Small Lummis Asset Management, LP $773 0.00% 36
Mid EverSource Wealth Advisors, LLC $727 0.00% 34
Small McMillan Office, Inc. $601 0.00% 28
Mid Allworth Financial LP $515 0.00% 24
Micro BAYBAN $429 0.00% 20
Small Greykasell Wealth Strategies, Inc. $386 0.00% 18
Mid Smartleaf Asset Management LLC $343 0.00% 16
Mid SBI Securities Co., Ltd. Broker-Dealer $300 0.00% 14
Mid North Star Investment Management Corp. $279 0.00% 13
Small Root Financial Partners, LLC $193 0.00% 9
Mid Ancora Advisors LLC $193 0.00% 9
Large OSAIC HOLDINGS, INC. $171 0.00% 8

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