MASON CAPITAL MANAGEMENT LLC
CIK 0001218735 · NEW YORK, NY · Quarter end: 2026-06-30 · Filed on: 2026-08-14 · Open the SEC source ↗
Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.
$607.0M
2026 Q2
Positions
9
Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.
100.0%
Est. Net Flow (Q)
—
2026 Q2
Top Holdings
ATS
ATS CORPORATION
77.8%
BKD
BROOKDALE SENIOR LIVING INC
6.8%
HA7
ENVIRI CORP
6.4%
CCO
CLEAR CHANNEL OUTDOOR HLDGS
3.9%
GRPN
GROUPON INC
2.6%
RC
READY CAPITAL CORP
1.2%
JELD
JELD-WEN HOLDING INC
0.8%
LOGC
CONTEXTLOGIC HOLDINGS INC
0.4%
New / Increased
No prior quarter data
Reduced / Exited
No prior quarter data
Read the 2026-Q2 quarterly report · 13F Filing Calendar
13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.