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Disclosed positions
MASON CAPITAL MANAGEMENT LLC: source evidence dated 2026-08-15T03:59:59.999Z.
- Issuer
- ATS CORPORATION
- Ticker
- ATS
- Class
- COM
- Reported value
- $472,112,013
- Reported amount
- 16,404,170
- Unit
- SH
- Option
- None
The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.
What was reported for this quarter?
13F positions are dated quarter-end holdings, with later publication and possible amendments. Read report period and availability before calling them current.
SEC 13F-HR: 0001104659-26-097052Open the effective filing receipt and inspect shares, value and any put/call classification separately.
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Open the effective filing receipt and inspect shares, value and any put/call classification separately.
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Disclosed positions
See the complete disclosed positions
| ATS CORPORATION | ATS | COM | $472,112,013 | 16,404,170 | SH | None |
| BROOKDALE SENIOR LIVING INC | BKD | COM | $41,445,040 | 2,575,826 | SH | None |
| ENVIRI CORP | Unresolved | COM | $38,872,550 | 1,770,959 | SH | None |
| CLEAR CHANNEL OUTDOOR HLDGS | CCO | COM | $23,784,730 | 9,828,401 | SH | None |
| GROUPON INC | GRPN | COM | $15,810,885 | 657,144 | SH | None |
| READY CAPITAL CORP | RC | REIT | $7,559,883 | 4,319,933 | SH | None |
| JELD-WEN HOLDING INC | JELD | COM | $4,664,432 | 3,109,621 | SH | None |
| CONTEXTLOGIC HOLDINGS INC | LOGC | COM | $2,592,935 | 291,341 | SH | None |
| SIGNATURE BANK | Unresolved | COM | $180,000 | 400,000 | SH | None |
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Largest 50 positions by reported value; the filing may contain more positions.
How amendments affect these holdings
This view uses 1 effective filing version(s). A restatement replaces the previous book; a new-holdings amendment adds positions. 2 positions lack a resolved ticker and 0 positions are put or call entries.
A 13F is a delayed quarterly snapshot of disclosed holdings. It is not a complete trade ledger and does not reveal every position in a manager's portfolio. Option values refer to the reported underlying position rather than a traded option premium.
Quarter end and public filing date
Use the filing's public availability date when constructing a historical observation. The quarter-end report period is earlier and cannot be substituted for when the public learned the holdings.