Mason Capital Management Llc

Institutional manager — quarterly 13F holdings, Q ending 2026-03-31

Reported value

$612.9M

Q ending 2026-03-31

Prior quarter

$561.6M

Q ending 2025-12-31

Change

+9.1% QoQ · +43.5% YoY

Positions

reported holdings

Largest positions

All 7 reported positions, Q ending 2026-03-31. A manager can hold shares, calls and puts on the same security at once — such positions are listed as separate rows. Type: Shares = common stock, Put/Call = option positions (valued at the underlying), Principal = debt. Tickers link to stock pages where covered.

Holding	Ticker	Type	Value ▼	Shares
Ats Corporation	ATS	Shares	$462.6M	16.4M
Enviri Corp	HA7	Shares	$88.2M	4.5M
Brookdale Senior Living Inc	BKD	Shares	$30.6M	2.2M
Clear Channel Outdoor Hldgs	CCO	Shares	$23.3M	9.8M
Ready Capital Corp	RC	Shares	$7.0M	4.3M
Jeld-Wen Holding Inc	JELD	Shares	$963K	777K
Signature Bank	SBNY	Shares	$260K	400K

Values as reported in public regulatory filings (USD); holdings are reported quarterly, up to 45 days after quarter end, and may contain reporting errors. Nothing here is investment advice.