Mason Capital Management LLC
Annual return
—
SPY
—
Alpha
—
Invested
$1.2B
Holdings
7
Trades YTD
0
Performance · Fund vs SPY
Cumulative return · quarterly snapshotsCoverage 98%. 2 quarters of 2025 measured against SPY adj-close benchmark.
Top holdings · current snapshot
Source: 13F-HR01
$ATS
ATS CORPORATION
Q4 2025: Exited (was 15.56M shares)
75.5%
02
$NVRI
ENVIRI CORP
Held since at least Q1 2024
14.4%
03
$BKD
BROOKDALE SENIOR LIVING INC
Q4 2025: Exited (was 2.48M shares)
5.0%
04
$CCO
CLEAR CHANNEL OUTDOOR HLDGS
Q4 2025: Exited (was 9.83M shares)
3.8%
05
$RC
READY CAPITAL CORP
Q1 2025: Exited (was 278.9k shares)
1.1%
06
$JELD
JELD-WEN HOLDING INC
Held since at least Q1 2024
0.2%
07
$SBNY
SIGNATURE BANK
Q4 2025: Exited (was 400.0k shares)
0.0%
Recent trades · Last 90 days
No Form 4 / 13D / 13G trade events on file in the recent window. 13F filers report position snapshots quarterly rather than per-trade events, so this section is most useful for managers who also file Form 4 or 13D/G.
Convergence · Pattern Engine ships in v1.1
30-day windowIn development
Convergence participation lands with the Pattern Engine.
Once the Pattern Engine ships, this section will list every active convergence event this fund is named in — with the other named funds, the Congress members on the same name, and combined position size.
Source data: SEC EDGAR · 13F-HR filings · Last refreshed 12:15 UTC.