MASON CAPITAL MANAGEMENT LLC

CIK: 0001218735SEC EDGAR →

Portfolio Value

$561.6M

Holdings

9

As of

Q4 2025

New Positions

3

Closed Positions

1

Portfolio Value History

Top 10 Holdings

RankStockSharesValue% of Portfolio
1

ATS CORPORATION

15,563,568$428.6M
76.32%
2

BROOKDALE SENIOR LIVING INC

3,585,941$38.7M
6.89%
3

SOLSTICE ADV MATERIALS INC

633,801$30.8M
5.48%
4

CLEAR CHANNEL OUTDOOR HLDGS

9,828,401$21.7M
3.87%
5

JBS N.V.

1,306,000$18.8M
3.35%
6

BORR DRILLING LTD

2,182,136$8.8M
1.57%
7

READY CAPITAL CORP

3,776,139$8.2M
1.47%
8

MESA LABORATORIES INC

70,300$5.5M
0.98%
9

SIGNATURE BANK

400,000$404K
0.07%

Quarterly Changes

Top Buys

SOLSNEW
$30.8M
JBSNEW
$18.8M
B7S↑ Increased
$17.7M
BORRNEW
$8.8M
RCNEW
$8.2M

Top Sells

KVUECLOSED
$42.1M

New Positions (4)

$30.8M · 634K shares
$18.8M · 1.3M shares
$8.8M · 2.2M shares
$8.2M · 3.8M shares

Closed Positions (1)

$42.1M · 2.6M shares

Sector Breakdown

Sector# HoldingsValue%
Industrials1$428.6M76.3%
Unknown2$39.1M7.0%
Basic Materials1$30.8M5.5%
Communication Services1$21.7M3.9%
Consumer Defensive1$18.8M3.4%
Energy1$8.8M1.6%
Real Estate1$8.2M1.5%
Technology1$5.5M1.0%