Filed: 8/14/2026ACC: 0001104659-26-097052
📋 What this filing means
MASON CAPITAL MANAGEMENT LLC filed this quarterly 13F‑HR report disclosing 9 equity positions with a total reported market value of $607.02M. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
9
Positions
$607.02M
Total AUM (reported)
39.36M
Total Shares
Allocation by class
COM$599.46M98.8%
REIT$7.56M1.2%
Portfolio Concentration
Top 3$552.43M91.0%
4–10$54.59M9.0%
Top 3 weight
91.0%
Top 10 weight
100.0%
Voting Authority Distribution
Total shares with voting rights: 39.36M
Sole
Full voting authority
39.36M
shares
% of voting shares100.0%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
0.00
shares
% of voting shares0.0%
Investment Discretion (by position count)
Sole9
Shared0
Other0
Dominant voting typeSole · 100.0% of voting shares
Institutional Holdings9
Rows:
ATS CORPORATION
SOLEShares16.40M
TypeSH
Market value$472.11M
77.78%
Sole
16.40M
Shared
0.00
None
0.00
BROOKDALE SENIOR LIVING INC
SOLEShares2.58M
TypeSH
Market value$41.45M
6.83%
Sole
2.58M
Shared
0.00
None
0.00
ENVIRI CORP
SOLEShares1.77M
TypeSH
Market value$38.87M
6.40%
Sole
1.77M
Shared
0.00
None
0.00
CLEAR CHANNEL OUTDOOR HLDGS
SOLEShares9.83M
TypeSH
Market value$23.78M
3.92%
Sole
9.83M
Shared
0.00
None
0.00
GROUPON INC
SOLEShares657.14K
TypeSH
Market value$15.81M
2.60%
Sole
657.14K
Shared
0.00
None
0.00
READY CAPITAL CORP
SOLEShares4.32M
TypeSH
Market value$7.56M
1.25%
Sole
4.32M
Shared
0.00
None
0.00
JELD-WEN HOLDING INC
SOLEShares3.11M
TypeSH
Market value$4.66M
0.77%
Sole
3.11M
Shared
0.00
None
0.00
CONTEXTLOGIC HOLDINGS INC
SOLEShares291.34K
TypeSH
Market value$2.59M
0.43%
Sole
291.34K
Shared
0.00
None
0.00
SIGNATURE BANK
SOLEShares400K
TypeSH
Market value$180.0K
0.03%
Sole
400K
Shared
0.00
None
0.00
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
ATS CORPORATIONSOLE | COM | 16.40M | SH | $472.11M 77.78% | 16.40M | 0.00 | 0.00 |
BROOKDALE SENIOR LIVING INCSOLE | COM | 2.58M | SH | $41.45M 6.83% | 2.58M | 0.00 | 0.00 |
ENVIRI CORPSOLE | COM | 1.77M | SH | $38.87M 6.40% | 1.77M | 0.00 | 0.00 |
CLEAR CHANNEL OUTDOOR HLDGSSOLE | COM | 9.83M | SH | $23.78M 3.92% | 9.83M | 0.00 | 0.00 |
GROUPON INCSOLE | COM | 657.14K | SH | $15.81M 2.60% | 657.14K | 0.00 | 0.00 |
READY CAPITAL CORPSOLE | REIT | 4.32M | SH | $7.56M 1.25% | 4.32M | 0.00 | 0.00 |
JELD-WEN HOLDING INCSOLE | COM | 3.11M | SH | $4.66M 0.77% | 3.11M | 0.00 | 0.00 |
CONTEXTLOGIC HOLDINGS INCSOLE | COM | 291.34K | SH | $2.59M 0.43% | 291.34K | 0.00 | 0.00 |
SIGNATURE BANKSOLE | COM | 400K | SH | $180.0K 0.03% | 400K | 0.00 | 0.00 |