MASON CAPITAL MANAGEMENT LLC - Stock Holdings in 13F Filings (SEC)

Updated on March 15, 2026.

Based on 13F Filings filed with the SEC on February 17, 2026, for the 2025 Q4 period, MASON CAPITAL MANAGEMENT LLC held in its portfolio 9 assets valued at $561,604,846 (i.e. $561.61M).

The most valuable assets in the portfolio included: ATS CORPORATION ($428.62M), BROOKDALE SENIOR LIVING INC ($38.69M), and SOLSTICE ADV MATERIALS INC ($30.79M).

The chart below shows the top 9 valuable assets, and the table below shows the top 9 valuable assets.

You can see similar for other investment managers.

Related Topics: SEC Topic List.

Data Source: SEC.

Top Valuable Stocks in MASON CAPITAL MANAGEMENT LLC Portfolio

ATS CORPORATION

BROOKDALE SENIOR LIVING INC

SOLSTICE ADV MATERIALS INC

CLEAR CHANNEL OUTDOOR HLDGS

JBS N.V.

BORR DRILLING LTD

READY CAPITAL CORP

MESA LABORATORIES INC

SIGNATURE BANK

MASON CAPITAL MANAGEMENT LLC - Stock Holdings in 13F Filings (SEC)

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Name of Issuer	No. of Shares	Value ($)	Class
ATS CORPORATION	15563568	428620663	COM
BROOKDALE SENIOR LIVING INC	3585941	38692303	COM
SOLSTICE ADV MATERIALS INC	633801	30790053	COM
CLEAR CHANNEL OUTDOOR HLDGS	9828401	21720766	COM
JBS N.V.	1306000	18832520	CL A SHS
BORR DRILLING LTD	2182136	8794008	SHS
READY CAPITAL CORP	3776139	8231983	REIT
MESA LABORATORIES INC	70300	5518550	COM
SIGNATURE BANK	400000	404000	COM