Institutions / Mason Capital Management LLC
Mason Capital Management LLC
CIK 1218735 · Institution · as of Mar 31, 2026
Portfolio value
$612.85M
Positions
7
As of
Mar 31, 2026
Portfolio trend
Portfolio value
$612.85M+9.1%Positions
7-22.2%Top holdings
Mar 31, 2026
| Company | Value | % of portfolio |
|---|---|---|
| ATS Corp /ATS | $462.60M | 75.5% |
| ENVIRI Corp | $88.18M | 14.4% |
| Brookdale Senior Living Inc. | $30.56M | 5.0% |
| Clear Channel Outdoor Holdings, Inc.CCO | $23.29M | 3.8% |
| Ready Capital Corporation | $7.00M | 1.1% |
| JELD-WEN Holding, Inc. | $963.3K | 0.2% |
| Signature Bank | $260.0K | 0.0% |
Activity
Mar 31, 2026View full history →
InsidersInstitutions
This fund's 13F position changes — what it's buying and selling.| Date | Action | Company | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|
| Q1 2026 as of | New | ENVIRI Corp | $88.18M | +4.5M | 4,494,536 14.39% of portfolio | high |
| Q1 2026 as of | Exit | Solstice Advanced Materials Inc. | $-30.79M | -634K -100.00% | — | medium |
| Q1 2026 as of | Add | ATS Corp /ATS | $23.70M | +841K +5.40% | 16,404,170 75.48% of portfolio | medium |
| Q1 2026 as of | Exit | N4732M103 | $-18.83M | -1.3M -100.00% | — | medium |
| Q1 2026 as of | Trim | Brookdale Senior Living Inc. | $-18.50M | -1.4M -37.71% | 2,233,741 4.99% of portfolio | medium |
| Q1 2026 as of | Exit | G1466R173 | $-8.79M | -2.2M -100.00% | — | medium |
| Q1 2026 as of | Exit | Mesa Laboratories Inc /Co | $-5.52M | -70K -100.00% | — | medium |
| Q1 2026 as of | New | JELD-WEN Holding, Inc. | $963.3K | +777K | 776,885 0.16% of portfolio | low |
| Q1 2026 as of | Add | Ready Capital Corporation | $880.9K | +544K +14.40% | 4,319,933 1.14% of portfolio | low |