Filed: 11/14/2025ACC: 0001104659-25-111862
📋 What this filing means
MASON CAPITAL MANAGEMENT LLC filed this quarterly 13F‑HR report disclosing 6 equity positions with a total reported market value of $491.35M. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
6
Positions
$491.35M
Total AUM (reported)
30.93M
Total Shares
Allocation by class
COM$491.35M100.0%
Portfolio Concentration
Top 3$470.85M95.8%
4–10$20.50M4.2%
Top 3 weight
95.8%
Top 10 weight
100.0%
Voting Authority Distribution
Total shares with voting rights: 30.93M
Sole
Full voting authority
30.93M
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)
Sole6
Shared0
Other0
Dominant voting typeSole · 100.0% of voting shares
Institutional Holdings6
Rows:
ATS CORPORATION
SOLEShares15.56M
TypeSH
Market value$407.77M
82.99%
Sole
15.56M
Shared
0.00
None
0.00
KENVUE INC
SOLEShares2.60M
TypeSH
Market value$42.12M
8.57%
Sole
2.60M
Shared
0.00
None
0.00
BROOKDALE SENIOR LIVING INC
SOLEShares2.48M
TypeSH
Market value$20.97M
4.27%
Sole
2.48M
Shared
0.00
None
0.00
CLEAR CHANNEL OUTDOOR HLDGS
SOLEShares9.83M
TypeSH
Market value$15.53M
3.16%
Sole
9.83M
Shared
0.00
None
0.00
MESA LABORATORIES INC
SOLEShares70.30K
TypeSH
Market value$4.71M
0.96%
Sole
70.30K
Shared
0.00
None
0.00
SIGNATURE BANK
SOLEShares400K
TypeSH
Market value$260.0K
0.05%
Sole
400K
Shared
0.00
None
0.00
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
ATS CORPORATIONSOLE | COM | 15.56M | SH | $407.77M 82.99% | 15.56M | 0.00 | 0.00 |
KENVUE INCSOLE | COM | 2.60M | SH | $42.12M 8.57% | 2.60M | 0.00 | 0.00 |
BROOKDALE SENIOR LIVING INCSOLE | COM | 2.48M | SH | $20.97M 4.27% | 2.48M | 0.00 | 0.00 |
CLEAR CHANNEL OUTDOOR HLDGSSOLE | COM | 9.83M | SH | $15.53M 3.16% | 9.83M | 0.00 | 0.00 |
MESA LABORATORIES INCSOLE | COM | 70.30K | SH | $4.71M 0.96% | 70.30K | 0.00 | 0.00 |
SIGNATURE BANKSOLE | COM | 400K | SH | $260.0K 0.05% | 400K | 0.00 | 0.00 |