MASON CAPITAL MANAGEMENT LLC
An institutional investment manager in NEW YORK, NY. Its Form 13F for the quarter ended Jun 30, 2026, filed Aug 14, 2026. SEC CIK 1218735.
- Reported value$607.0m
- Positions9
Holdings: 9 positions
The filing on sec.govAs filed, largest first. Reported value is what the manager stated for each position at the quarter end, in US dollars; it is filing data, not a price. Weight is the position's share of the total reported value. Changes compare with the 13F for the quarter ended 2026-03-31.
| Issuer | Class | CUSIP | Reported value$m | Weight | Shares | Put or call | Change on the quarter before |
|---|---|---|---|---|---|---|---|
| ATS CorporationATS | COM | 00217Y104 | 472 | 77.8% | 16,404,170 | Unchanged | |
| Brookdale Senior Living IncBKD | COM | 112463104 | 41.4 | 6.8% | 2,575,826 | Added+342,085 | |
| Enviri Corp | COM | 415864107 | 38.9 | 6.4% | 1,770,959 | Reduced−2,723,577 | |
| Clear Channel Outdoor Holdings | COM | 18453H106 | 23.8 | 3.9% | 9,828,401 | Unchanged | |
| Groupon IncGRPN | COM | 399473206 | 15.8 | 2.6% | 657,144 | New+657,144 | |
| Ready Capital CorpRC | REIT | 75574U101 | 7.6 | 1.2% | 4,319,933 | Unchanged | |
| Jeld-Wen Holding IncJELD | COM | 47580P103 | 4.7 | 0.8% | 3,109,621 | Added+2,332,736 | |
| Contextlogic Holdings IncLOGC | COM | 21078F109 | 2.6 | 0.4% | 291,341 | New+291,341 | |
| Signature Bank | COM | 82669G104 | 0.2 | <0.1% | 400,000 | Unchanged |
Source: SEC EDGAR, Form 13F-HR, accession 0001104659-26-097052 (on sec.gov). Last ingested by Listed: Oct 22, 2026, 05:26 ET. Listed shows no prices and gives no investment advice.