2026 Q1 Portfolio Activity
In 2026 Q1, MASON CAPITAL MANAGEMENT LLC maintained a portfolio of 11 distinct positions. The most significant new addition was ENVIRI CORP, now representing 14.39% of the total fund value. They heavily accumulated shares in READY CAPITAL CORP, increasing the position by 14.4%. Conversely, MASON CAPITAL MANAGEMENT LLC completely exited their position in SOLSTICE ADV MATERIALS INC.
Position History
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Total Positions
11
Quarter
2026 Q1
Top Holding
ATS (75.5%)
Top 10 Concentration
100.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-11 of 11
MASON CAPITAL MANAGEMENT LLC Full Holdings List — 2026 Q1
| 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 | 75.48% | 76.32% |
#1
Prev: #1
|
8.0 |
—
|
840,602 | 5.4% |
P
S
|
16,404,170 | $462,597,594 |
$44.16
-23.6%
|
2023 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
NVRI
ENVIRI CORP
|
Industrials | 14.39% | — |
#2
Prev: #—
|
9.0 |
—
|
4,494,536 | — |
NEW
|
4,494,536 | $88,182,796 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
BKD
BROOKDALE SENIO...
|
Healthcare | 4.99% | 6.89% |
#3
1
Prev: #2
|
3.0 |
—
|
-1,352,200 | -37.7% |
P
S
|
2,233,741 | $30,557,577 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CCO
CLEAR CHANNEL O...
|
Communication Services | 3.80% | 3.87% |
#4
Prev: #4
|
3.0 |
—
|
no change | no change |
P
S
|
9,828,401 | $23,293,310 | 2019 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
RC
READY CAPITAL C...
|
Real Estate | 1.14% | 1.47% |
#5
2
Prev: #7
|
3.0 |
—
|
543,794 | 14.4% |
P
S
|
4,319,933 | $6,998,291 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
JELD
JELD-WEN HOLDIN...
|
Industrials | 0.16% | — |
#6
Prev: #—
|
3.6 |
—
|
776,885 | — |
NEW
|
776,885 | $963,337 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
SBNY
SIGNATURE BANK
|
Financial Services | 0.04% | 0.07% |
#7
2
Prev: #9
|
1.0 |
—
|
no change | no change |
P
S
|
400,000 | $260,000 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MLAB
MESA LABORATORI...
|
Technology | 0.00% | 0.98% |
Sold All 😨
(Was: #8) |
0.0 |
—
|
-70,300 | -100.0% |
CLOSED
|
— | $— | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
BORR
BORR DRILLING L...
|
Energy | 0.00% | 1.57% |
Sold All 😨
(Was: #6) |
0.0 |
—
|
-2,182,136 | -100.0% |
CLOSED
|
— | $— | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
JBS N.V.
|
|
Unknown | 0.00% | 3.35% |
Sold All 😨
(Was: #5) |
0.0 |
—
|
-1,306,000 | -100.0% |
CLOSED
|
— | $— | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
SOLS
SOLSTICE ADV MA...
|
Basic Materials | 0.00% | 5.48% |
Sold All 😨
(Was: #3) |
0.0 |
—
|
-633,801 | -100.0% |
CLOSED
|
— | $— | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 |
Showing 1-11 of 11 holdings