Mason Capital Management LLC 13F holdings, Q2 2026
Holdings as of June 30, 2026 · filings on SEC EDGAR · this is the latest filing on record
Mason Capital Management LLC disclosed 9 US equity positions worth $607.0m in its Q2 2026 13F filing. The largest position was ATS at 77.8% of the reported book, followed by BKD and NVRI. Against the Q1 2026 filing, it opened 2 new positions, added to 2 and reduced 1 among the top 9 holdings.
What did Mason Capital Management LLC own in Q2 2026? Top 9 positions
| # | Stock | Sector | Weight | Value | Shares | Δ shares | vs Q1 2026 |
|---|---|---|---|---|---|---|---|
| 1 | ATS ATS CORPORATION | Industrials | 77.8% | $472.1m | 16,404,170 | 0% | held |
| 2 | BKD BROOKDALE SENIOR LIVING INC | Healthcare | 6.8% | $41.4m | 2,575,826 | 15% | added |
| 3 | NVRI ENVIRI CORP | Industrials | 6.4% | $38.9m | 1,770,959 | -61% | reduced |
| 4 | CCO CLEAR CHANNEL OUTDOOR HLDGS | Communication Services | 3.9% | $23.8m | 9,828,401 | 0% | held |
| 5 | GRPN GROUPON INC | Communication Services | 2.6% | $15.8m | 657,144 | – | new |
| 6 | RC READY CAPITAL CORP | 1.2% | $7.6m | 4,319,933 | 0% | held | |
| 7 | JELD JELD-WEN HOLDING INC | Industrials | 0.8% | $4.7m | 3,109,621 | 300% | added |
| 8 | CONTEXTLOGIC HOLDINGS INC | 0.4% | $2.6m | 291,341 | – | new | |
| 9 | SBNY SIGNATURE BANK | Financial Services | 0.0% | $180.0k | 400,000 | 0% | held |
Weights are shares of the reported long US equity book (options excluded). Values are as filed, normalised to whole dollars. Share changes compare against the immediately preceding filing only.