MASON CAPITAL MANAGEMENT LLC
CIK 1218735
13F filing for Q2 2026・No. 3,488
- Holdings
- US$607.02M
- Quarter change
- −US$5.83M
- Entries
- 9
- Net bought (estimate)
- −US$32.38M
The quarter change is the holdings' value against the quarter before, price moves included — not what was bought or sold; each institution's page estimates that.
Net bought (estimate)
Each stock's change in shares at the quarter-end price, added up: a new position counts as bought, one sold out as sold, shares held long only. Splits are compared split-adjusted; corporate actions under a new CUSIP are not estimated. An estimate from the filings, not actual trades.
- New 2
- Sold out 0
- Cut 1
- Added 2
- Corporate actions 0
- Unchanged 4
Largest holdings
9 stocks worth US$607.02M, options and bonds left out.
| Stock | This quarter | Shares | Value | Weight |
|---|---|---|---|---|
| ATS CORPORATIONCOM | Unchanged | 16,404,170 | US$472.11M | 77.78% |
| BROOKDALE SENIOR LIVING INCCOM | Added | 2,575,826 | US$41.45M | 6.83% |
| ENVIRI CORPCOM | Cut | 1,770,959 | US$38.87M | 6.40% |
| CCOCLEAR CHANNEL OUTDOOR HLDGSCOM | Unchanged | 9,828,401 | US$23.78M | 3.92% |
| GROUPON INCCOM | New | 657,144 | US$15.81M | 2.60% |
| READY CAPITAL CORPREIT | Unchanged | 4,319,933 | US$7.56M | 1.25% |
| JELD-WEN HOLDING INCCOM | Added | 3,109,621 | US$4.66M | 0.77% |
| CONTEXTLOGIC HOLDINGS INCCOM | New | 291,341 | US$2.59M | 0.43% |
| SIGNATURE BANKCOM | Unchanged | 400,000 | US$180K | 0.03% |
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Filings
The quarter's original 13F filings (SEC).
- 13F-HRFiled August 14, 2026SEC ↗
13F covers long positions in US-listed securities only; the data is SEC's, filed within 45 days of the quarter's end.