Asset Manager · CIK 0000807985
Southeastern Asset
Longleaf
Southeastern Asset runs Longleaf, an asset manager overseeing $2.25B in disclosed equity holdings (SEC CIK 0000807985). The latest 13F filing (2025Q4) discloses 53 positions across 10 sectors, with the largest positions in CNX, MAT and IAC. On a mark-to-market basis the tracked portfolio has returned 8.9% over the past year. OpenStocks tracks 40 consecutive 13F filings for this manager — every position change, new entry, and exit is logged below.
Portfolio
$2.25B
Positions
53
Quarter
2025Q4
Filings tracked
40
Biggest winner since filing
CNXCNX RES CORP
+137.0%
+$108.9M
Biggest loser since filing
IACIAC INTERACTIVECORP NEW
-40.2%
−$116.7M
Investment strategy
Southeastern Asset is a mid-size fund. Disclosed equity book is between $1B and $10B.
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<iframe src="https://openstocks.me/embed/stock/CNX" width="100%" height="480" frameborder="0" loading="lazy" title="CNX chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>Holdings
10 sectors53 positions
Top 3 = 22% of book · CNX, MAT, IAC
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Performance
vs SPY40 quarters tracked
Mark-to-market portfolio growth vs SPY benchmark, with AUM and concentration history.
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Options & derivatives
No options
Southeastern Asset has no PUT or CALL positions disclosed in this quarter's 13F.
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Activity & trades
Quarter-by-quarterLast move 2025Q4
ADD MGM — and 4 more recent moves.
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Recent transactions
See full activity →ADD
MGM RESORTS INTERNATIONAL
+285,367
~$36.49 · 2025Q4
2026-02-13
ADD
POTLATCHDELTIC CORPORATION
+1,031,209
~$39.78 · 2025Q4
2026-02-13
