AI Portfolio Summary
In 2025 Q4, MASON CAPITAL MANAGEMENT LLC maintained a portfolio of 10 distinct positions. The most significant new addition to the portfolio was SOLSTICE ADV MATERIA, which now represents 5.48% of the total fund value. They heavily accumulated shares in BROOKDALE SENIOR LIV, increasing their position by 44.8%. Conversely, MASON CAPITAL MANAGEMENT LLC completely exited their position in KENVUE INC.
Total Positions
10
Quarter
2025 Q4
Top Holding
ATS (76.3%)
Top 10 Concentration
100.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
1-10 of 10
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
ATS
ATS CORPORATION
|
Industrials | 76.32% | 82.99% |
#1
Prev: #1
|
10.0 | no change | no change |
P
S
|
15,563,568 | $428,620,663 | 2023 Q2 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
BKD
BROOKDALE SENIO...
|
Healthcare | 6.89% | 4.27% |
#2
1
Prev: #3
|
4.9 | 1,109,977 | 44.8% |
P
S
|
3,585,941 | $38,692,303 | 2025 Q3 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
SOLS
SOLSTICE ADV MA...
|
Basic Materials | 5.48% | — |
#3
Prev: #—
|
4.2 | 633,801 | no change |
NEW
|
633,801 | $30,790,053 | 2025 Q4 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
CCO
CLEAR CHANNEL O...
|
Communication Services | 3.87% | 3.16% |
#4
Prev: #4
|
1.5 | no change | no change |
P
S
|
9,828,401 | $21,720,766 | 2019 Q2 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
N/A
JBS N.V.
|
—
|
Unknown | 3.35% | — |
#5
Prev: #—
|
3.3 | 1,306,000 | no change |
NEW
|
1,306,000 | $18,832,520 | — | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | ||
|
BORR
BORR DRILLING L...
|
Energy | 1.57% | — |
#6
Prev: #—
|
2.6 | 2,182,136 | no change |
NEW
|
2,182,136 | $8,794,008 | 2025 Q4 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
RC
READY CAPITAL C...
|
Real Estate | 1.47% | — |
#7
Prev: #—
|
2.6 | 3,776,139 | no change |
NEW
|
3,776,139 | $8,231,983 | 2024 Q3 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
MLAB
MESA LABORATORI...
|
Technology | 0.98% | 0.96% |
#8
3
Prev: #5
|
0.4 | no change | no change |
P
S
|
70,300 | $5,518,550 | 2025 Q3 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
SBNY
SIGNATURE BANK
|
Financial Services | 0.07% | 0.05% |
#9
3
Prev: #6
|
0.0 | no change | no change |
P
S
|
400,000 | $404,000 | 2024 Q1 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) | |||
|
KVUE
KENVUE INC
|
Consumer Defensive | 0.00% | 8.57% |
Sold All 😨
(Was: #2) |
0.3 | -2,595,000 | -100.0% |
CLOSED
|
— | $— | 2025 Q3 | 13F Filing | 2025-12-31 | 2026-02-14 (Est.) |
Showing 1-10 of 10 holdings