account_balance
Investment manager · 13F filer · SEC CIK 1218735
Mason Capital Management LLC
Reported value$607Mas of Jun 30, 2026
Positions9 2 new, 0 sold out
Top 10 weight100.0%ATS alone is 78%
FiledAug 1445 days after quarter end
Portfolio · as of Jun 30, 2026
Where the money is
New or addedTrimmedHeld
This fund reports 9 stocks.
ATSAts Corporation
77.8%
BKDBrookdale Senior Living Inc
6.8%Added +15%
Enviri Corp
6.4%Trimmed −61%
CCOClear Channel Outdoor Hldgs
3.9%
GRPN2.6%RC1.2%JELD0.8%Contextlogic Holdings Inc
Box size is the share of the fund. 13F only covers US-listed stocks, so foreign holdings and short positions are missing.
Show the top 9 as a list
ATS Ats Corporation 77.8% HeldBKD Brookdale Senior Living Inc 6.8% Added +15%
Enviri Corp 6.4% Trimmed −61%
CCO Clear Channel Outdoor Hldgs 3.9% HeldGRPN Groupon Inc 2.6% NewRC Ready Capital Corp 1.2% HeldJELD Jeld-wen Holding Inc 0.8% Added +300%Contextlogic Holdings Inc 0.4% New
SBNY Signature Bank 0.0% HeldWhat changed