2026 Q2 Portfolio Activity
In 2026 Q2, MASON CAPITAL MANAGEMENT LLC maintained a portfolio of 9 distinct positions. The most significant new addition was GROUPON INC, now representing 2.60% of the total fund value. They heavily accumulated shares in BROOKDALE SENIOR LIVING INC, increasing the position by 15.3%. The fund also reduced its exposure to ENVIRI CORP by 60.6%.
Position History
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Total Positions
9
Quarter
2026 Q2
Top Holding
ATS (77.8%)
Top 10 Concentration
100.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-9 of 9
MASON CAPITAL MANAGEMENT LLC Full Holdings List — 2026 Q2
| 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 | 77.78% | 75.48% |
#1
Prev: #1
|
7.0 |
—
|
no change | no change |
P
S
|
16,404,170 | $472,112,013 | 2023 Q2 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
BKD
BROOKDALE SENIO...
|
Healthcare | 6.83% | 4.99% |
#2
1
Prev: #3
|
6.2 |
—
|
342,085 | 15.3% |
P
S
|
2,575,826 | $41,445,040 | 2025 Q3 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
NVRI
ENVIRI CORP
|
Industrials | 6.40% | 14.39% |
#3
1
Prev: #2
|
3.6 |
—
|
-2,723,577 | -60.6% |
P
S
|
1,770,959 | $38,872,550 | 2026 Q1 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
CCO
CLEAR CHANNEL O...
|
Communication Services | 3.92% | 3.80% |
#4
Prev: #4
|
3.1 |
—
|
no change | no change |
P
S
|
9,828,401 | $23,784,730 | 2019 Q2 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
GRPN
GROUPON INC
|
Communication Services | 2.60% | — |
#5
Prev: #—
|
5.0 |
—
|
657,144 | — |
NEW
|
657,144 | $15,810,885 | 2026 Q2 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
RC
READY CAPITAL C...
|
Real Estate | 1.25% | 1.14% |
#6
1
Prev: #5
|
1.5 |
—
|
no change | no change |
P
S
|
4,319,933 | $7,559,883 | 2024 Q3 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
JELD
JELD-WEN HOLDIN...
|
Industrials | 0.77% | 0.16% |
#7
1
Prev: #6
|
3.3 |
—
|
2,332,736 | 300.3% |
P
S
|
3,109,621 | $4,664,432 | 2026 Q1 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
LOGCD
CONTEXTLOGIC HO...
|
Unknown | 0.43% | — |
#8
Prev: #—
|
3.7 |
—
|
291,341 | — |
NEW
|
291,341 | $2,592,935 | 2026 Q2 | 13F Filing | 2026-06-30 | 2026-08-14 | |||
|
SBNY
SIGNATURE BANK
|
Financial Services | 0.03% | 0.04% |
#9
2
Prev: #7
|
1.0 |
—
|
no change | no change |
P
S
|
400,000 | $180,000 | 2024 Q1 | 13F Filing | 2026-06-30 | 2026-08-14 |
Showing 1-9 of 9 holdings