Holders — by stockHoldings — by fund
MASON CAPITAL MANAGEMENT LLC
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0001218735
$607.0M
disclosed book value
9
positions
77.8%
largest position share
Positions, as of 2026-06-30
top 9 of 9 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | ATSATS CORPORATION | 16.4M | $472.1M | 77.8% |
| 2 | BKDBROOKDALE SENIOR LIVING INC | 2.6M | $41.4M | 6.8% |
| 3 | HA7ENVIRI CORP | 1.8M | $38.9M | 6.4% |
| 4 | CCOCLEAR CHANNEL OUTDOOR HLDGS | 9.8M | $23.8M | 3.9% |
| 5 | GRPNGROUPON INC | 657,144 | $15.8M | 2.6% |
| 6 | RCREADY CAPITAL CORP | 4.3M | $7.6M | 1.2% |
| 7 | JELDJELD-WEN HOLDING INC | 3.1M | $4.7M | 0.8% |
| 8 | LOGCCONTEXTLOGIC HOLDINGS INC | 291,341 | $2.6M | 0.4% |
| 9 | SBNYSIGNATURE BANK | 400,000 | $180,000 | 0% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.