Mason Capital Management LLC
In its 13F for Q2 2024 (holdings as of June 30, 2024, filed August 14, 2024), Mason Capital Management LLC reported 6 stock positions worth $538.2 million. Its top holding was Ats (ATS) at 86.1% of the portfolio, followed by Barnes (8.1%) and Clear Channel Outdoor Holdin (CCO, 2.6%). Compared with Q1 2024, it opened 1 new position, sold out of 1 and added to 1. The biggest buy was Barnes (shares +33%) and the biggest sale an exit from Seadrill (SDRL).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0001218735
- Portfolio Value
- $538.2M (Q2 2024)
- SEC Filing
- 0001104659-24-089695 ↗ filed Aug 14, 2024
Holdings Value
Holdings 6 stocks · $538.2M
| ATS Ats Corp. | 86.14% | 14,349,765 | $463.6M | No change |
| BARNES GROUP INC | 8.08% | 1,050,079 | $43.5M | Add +32.9% |
| CCO Clear Channel Outdoor Holdin | 2.57% | 9,828,401 | $13.9M | No change |
| MDRX Veradigm Inc. | 1.66% | 938,238 | $8.9M | No change |
| IIIV I3 Verticals Inc. Class A | 1.38% | 337,099 | $7.4M | New |
| SBNY Signature Bank | 0.16% | 400,000 | $876K | No change |
Portfolio Sells Q1 2024 → Q2 2024
| SDRL Seadrill Limited | Sold out | 0.00% | −2.75 |
Portfolio Buys Q1 2024 → Q2 2024
| BARNES GROUP INC | Add +32.9% | 8.08% | +4.05 |
| IIIV I3 Verticals Inc. Class A | New | 1.38% | +1.38 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 9 | $607.0M | ATS, BKD, NVRI, CCO, GRPN |
| Q1 2026 | 7 | $612.9M | ATS, NVRI, BKD, CCO, RC |
| Q4 2025 | 9 | $561.6M | ATS, BKD, SOLS, CCO, JBS |
| Q3 2025 | 6 | $491.4M | ATS, KVUE, BKD, CCO, MLAB |
| Q2 2025 | 4 | $511.5M | ATS, CCO, CCIR, SBNY |
| Q1 2025 | 5 | $427.2M | ATS, PARAA, CCO, CCIR, SBNY |
| Q4 2024 | 4 | $470.5M | ATS, CCO, RC, SBNY |
| Q3 2024 | 6 | $502.6M | ATS, MDRX, BARNES GROUP INC, CCO, RC |
| Q2 2024 | 6 | $538.2M | ATS, BARNES GROUP INC, CCO, MDRX, IIIV |
| Q1 2024 | 6 | $727.8M | ATS, BARNES GROUP INC, SDRL, CCO, MDRX |