Latest MASON CAPITAL MANAGEMENT LLC Stock Portfolio
$612Million | No. of Holdings #7
MASON CAPITAL MANAGEMENT LLC Performance
2026 Q1+2.96%
YTD+2.96%
2025-4.06%
About MASON CAPITAL MANAGEMENT LLC and 13F Hedge Fund Stock Holdings
MASON CAPITAL MANAGEMENT LLC is a hedge fund based in New York, NY. On 2026-05-15, the fund reported it's updated stock portfolio. In the 13F Holdings report, MASON CAPITAL MANAGEMENT LLC reported an equity portfolio of $612.9 Millions as of 31 Mar, 2026. <br><br> The top stock holdings of MASON CAPITAL MANAGEMENT LLC are , , BKD. The fund has invested 75.5% of it's portfolio in ATS CORPORATION and 14.4% of portfolio in ENVIRI CORP. <br><br> The fund managers got completely rid off SOLSTICE ADV MATERIALS INC, BORR DRILLING LTD (BORR) and MESA LABORATORIES INC (MLAB) stocks. They significantly reduced their stock positions in BROOKDALE SENIOR LIVING INC (BKD). MASON CAPITAL MANAGEMENT LLC opened new stock positions in ENVIRI CORP and JELD-WEN HOLDING INC (JELD). The fund showed a lot of confidence in some stocks as they added substantially to READY CAPITAL CORP (RC) and ATS CORPORATION.
MASON CAPITAL MANAGEMENT LLC Equity Portfolio Value
Last Reported on: 15 May, 2026
$612Million
as of May 15, 2026MASON CAPITAL MANAGEMENT LLC Annual Return Estimates Vs S&P 500
Our best estimate is that MASON CAPITAL MANAGEMENT LLC made a return of 2.96% in the last quarter. In trailing 12 months, it's portfolio return was 18.96%.
- Performance
- S&P 500
New Buys
| Ticker | $ Bought |
|---|---|
| enviri corp | 88,182,800 |
| jeld-wen holding inc | 963,337 |
New stocks bought by MASON CAPITAL MANAGEMENT LLC
Additions
| Ticker | % Inc. |
|---|---|
| ready capital corp | 14.4 |
| ats corporation | 5.4 |
Additions to existing portfolio by MASON CAPITAL MANAGEMENT LLC
Reductions
| Ticker | % Reduced |
|---|---|
| brookdale senior living inc | -37.71 |
MASON CAPITAL MANAGEMENT LLC reduced stake in above stock
Sold off
| Ticker | $ Sold |
|---|---|
| borr drilling ltd | -8,794,010 |
| jbs n.v. | -18,832,500 |
| solstice adv materials inc | -30,790,100 |
| mesa laboratories inc | -5,518,550 |
MASON CAPITAL MANAGEMENT LLC got rid off the above stocks
Sector Distribution
MASON CAPITAL MANAGEMENT LLC has about 89.9% of it's holdings in Others sector.
- Others
- Healthcare
- Communication Services
- Real Estate
| Sector | % |
|---|---|
| Others | 89.9 |
| Healthcare | 5 |
| Communication Services | 3.8 |
| Real Estate | 1.1 |
Market Cap. Distribution
MASON CAPITAL MANAGEMENT LLC has about 0% of it's portfolio invested in the large-cap and mega-cap stocks.
- UNALLOCATED
- MID-CAP
- SMALL-CAP
- MICRO-CAP
| Category | % |
|---|---|
| UNALLOCATED | 89.9 |
| MID-CAP | 5 |
| SMALL-CAP | 3.8 |
| MICRO-CAP | 1.3 |
Stocks belong to which Index?
About 10.1% of the stocks held by MASON CAPITAL MANAGEMENT LLC either belong to S&P 500 or RUSSELL 2000 index.
- Others
- RUSSELL 2000
| Index | % |
|---|---|
| Others | 89.9 |
| RUSSELL 2000 | 10.1 |
MASON CAPITAL MANAGEMENT LLC Holdings Map
This heatmap illustrates the top 50 positions within the fund's portfolio.
Current Stock Holdings of MASON CAPITAL MANAGEMENT LLC
MASON CAPITAL MANAGEMENT LLC has 7 stocks in it's portfolio. RC proved to be the most loss making stock for the portfolio. was the most profitable stock for MASON CAPITAL MANAGEMENT LLC last quarter.
$612.85MTotal Value
11.00Positions
15 May, 2026Last Reported
| Expand | Holdingsorted ascending | % Portfolio | Shares Held | $ Value | % Change |
|---|---|---|---|---|---|
 Brookdale Senior Living Inc MASON CAPITAL MANAGEMENT LLC's holding in Brookdale Senior Living Inc over time | 4.99% | 2,233,740 | $30.56M 4.99% | 37.71%decreased 37.71 percentreduced | |
 BORR Borr Drilling LtdBorr Drilling LtdBORR | 0% | 0.00 | $0.00 0% | 100%decreased 100 percentsold off | |
 Clear Channel Outdoor Hldgs MASON CAPITAL MANAGEMENT LLC's holding in Clear Channel Outdoor Hldgs over time | 3.8% | 9,828,400 | $23.29M 3.8% | 0%unchanged 0 percentunchanged | |
 Jeld-Wen Holding Inc MASON CAPITAL MANAGEMENT LLC's holding in Jeld-Wen Holding Inc over time | 0.16% | 776,885 | $963.3K 0.16% | Newnew position | |
 Mesa Laboratories Inc MASON CAPITAL MANAGEMENT LLC's holding in Mesa Laboratories Inc over time | 0% | 0.00 | $0.00 0% | 100%decreased 100 percentsold off | |
 Ready Capital Corp MASON CAPITAL MANAGEMENT LLC's holding in Ready Capital Corp over time | 1.14% | 4,319,930 | $7.00M 1.14% | 14.4%increased 14.4 percentadded | |
Com Ats CorporationAts Corporation | 75.48% | 16,404,200 | $462.60M 75.48% | 5.4%increased 5.4 percentadded | |
Com Enviri CorpEnviri Corp | 14.39% | 4,494,540 | $88.18M 14.39% | Newnew position | |
Com Signature BankSignature Bank | 0.04% | 400,000 | $260.0K 0.04% | 0%unchanged 0 percentunchanged | |
Cl A Shs Jbs N.V.Jbs N.V. | 0% | 0.00 | $0.00 0% | 100%decreased 100 percentsold off | |
Com Solstice Adv Materials IncSolstice Adv Materials Inc | 0% | 0.00 | $0.00 0% | 100%decreased 100 percentsold off | |