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MASON CAPITAL MANAGEMENT LLC
Period ended Jun 30, 2026 · Latest filing Aug 14, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Jun 30, 2026: $607,022,468
More quarters will appear as history becomes available.
Top holdings
Top 10 at Jun 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- ATS CORPORATION · COM · 00217Y104 · shares: $472,112,013
- BROOKDALE SENIOR LIVING INC · COM · 112463104 · shares: $41,445,040
- ENVIRI CORP · COM · 415864107 · shares: $38,872,550
- CLEAR CHANNEL OUTDOOR HLDGS · COM · 18453H106 · shares: $23,784,730
- GROUPON INC · COM · 399473206 · shares: $15,810,885
- READY CAPITAL CORP · REIT · 75574U101 · shares: $7,559,883
- JELD-WEN HOLDING INC · COM · 47580P103 · shares: $4,664,432
- CONTEXTLOGIC HOLDINGS INC · COM · 21078F109 · shares: $2,592,935
- SIGNATURE BANK · COM · 82669G104 · shares: $180,000
Reported holdings
9 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| ATS CORPORATION | COM | 00217Y104 | — | 16,404,170 shares | $472,112,013 |
| BROOKDALE SENIOR LIVING INC | COM | 112463104 | — | 2,575,826 shares | $41,445,040 |
| ENVIRI CORP | COM | 415864107 | — | 1,770,959 shares | $38,872,550 |
| CLEAR CHANNEL OUTDOOR HLDGS | COM | 18453H106 | — | 9,828,401 shares | $23,784,730 |
| GROUPON INC | COM | 399473206 | — | 657,144 shares | $15,810,885 |
| READY CAPITAL CORP | REIT | 75574U101 | — | 4,319,933 shares | $7,559,883 |
| JELD-WEN HOLDING INC | COM | 47580P103 | — | 3,109,621 shares | $4,664,432 |
| CONTEXTLOGIC HOLDINGS INC | COM | 21078F109 | — | 291,341 shares | $2,592,935 |
| SIGNATURE BANK | COM | 82669G104 | — | 400,000 shares | $180,000 |