§ 13F · FUND PROFILE
MASON CAPITAL MANAGEMENT LLC.
Institutional filer · behavioral pattern: Other. Summary pending.
AUM · $491.4T (13F)Positions · 6Turnover · — · Q4Filed · Feb 17, 2026
CONCENTRATION
—
Top 10 holdings
NEW BUYS
0
+$66.6T deployed
EXITS
0
No exits
SECTOR SHIFT
—
No prior quarter data
3YR HIT RATE
—
Top-5 overlap
§ 01 · TOP HOLDINGS
The book · Q4 2025
FILED FEB 17, 2026
| # | Ticker | Name | Shares | $ value | % port | Δ Q4 |
|---|---|---|---|---|---|---|
| 1 | ATS | ATS CORPORATION | 15.56M | $428.6T | 76.3% | ±0% |
| 2 | BKD | BROOKDALE SENIOR LIVING INC | 3.59M | $38.7T | 6.9% | +45% |
| 3 | SOLS | SOLSTICE ADV MATERIALS INC | 634K | $30.8T | 5.5% | NEW |
| 4 | CCO | CLEAR CHANNEL OUTDOOR HLDGS | 9.83M | $21.7T | 3.9% | ±0% |
| 5 | JBS | JBS N.V. | 1.31M | $18.8T | 3.4% | NEW |
| 6 | BORR | BORR DRILLING LTD | 2.18M | $8.8T | 1.6% | NEW |
| 7 | RC | READY CAPITAL CORP | 3.78M | $8.2T | 1.5% | NEW |
| 8 | MLAB | MESA LABORATORIES INC | 70K | $5.5T | 1.0% | ±0% |
| 9 | SBNY | SIGNATURE BANK | 400K | $404.0B | 0.1% | ±0% |
§ 02 · SECTOR ALLOCATION
Where the money is
Sector data pending
§ 03 · THE MASON SIGNAL
AC read
MASON CAPITAL MANAGEMENT LLC is a Other fund managing $491353.4 trillion in assets. The fund runs a focused portfolio of just 6 positions.
Read the full dossier →§ 04 · FILING HISTORY
Q-by-Q deltas
1 FILINGS
Q4 2025
Steady book
+0 buys · −0 exits · 0 changed
Q3 2025
Steady book
+0 buys · −0 exits · 0 changed
Q1 2025
Steady book
+0 buys · −0 exits · 0 changed