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MCM
Mason Capital Management Portfolio holdings
AUM
$607M
Turnover
22.22%
1-Year Est. Return
1.77%
This Fund
S&P 500
This Quarter
Est. Return
+4.41%
1 Year Est. Return
+1.77%
3 Year Est. Return
-18.46%
5 Year Est. Return
+39.95%
10 Year Est. Return
+284.4%
AUM
$613M
AUM Growth
+$51.2M
(+9.1%)
Cap. Flow
+$28.6M
Cap. Flow
% of AUM
4.67%
Top 10 Holdings %
Top 10 Hldgs %
100%
Holding
11
New
2
Increased
2
Reduced
1
Closed
4
Avg Time Held
1.8
years
Top 10 Avg Time Held
1.8
years
Top 20 Avg Time Held
1.8
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Enviri
NVRI
|
+$83.5M |
| 2 |
ATS Corp
ATS
|
+$25.3M |
| 3 |
JELD-WEN Holding
JELD
|
+$1.7M |
| 4 |
Ready Capital
RC
|
+$1.04M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Solstice Advanced Materials
SOLS
|
+$30.8M |
| 2 |
Brookdale Senior Living
BKD
|
+$18.9M |
| 3 |
JBS N.V.
JBS
|
+$18.8M |
| 4 |
Borr Drilling
BORR
|
+$8.79M |
| 5 |
Mesa Laboratories
MLAB
|
+$5.52M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Industrials | 90.03% |
| 2 | Healthcare | 4.99% |
| 3 | Communication Services | 3.8% |
| 4 | Real Estate | 1.14% |
| 5 | Financials | 0.04% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
|
1
ATS Corp
ATS
$1.78B
| $463M | 75.48% |
16,404,170
+840,602
| +5% | +$25.3M |
2023 Q2
11 quarters
|
|
|
2
Enviri
NVRI
$552M
| $88.2M | 14.39% |
+4,494,536
| New | +$83.5M |
2026 Q1
0 quarters
|
|
|
3
Brookdale Senior Living
BKD
$2.41B
| $30.6M | 4.99% |
2,233,741
-1,352,200
| -38% | -$18.9M |
2025 Q3
2 quarters
|
|
4
Clear Channel Outdoor Holdings
CCO
$1.23B
| $23.3M | 3.8% |
9,828,401
| – | – |
2019 Q2
27 quarters
|
|
|
5
Ready Capital
RC
$185M
| $7M | 1.14% |
4,319,933
+543,794
| +14% | +$1.04M |
2025 Q4
1 quarter
|
|
|
6
JELD-WEN Holding
JELD
$118M
| $963K | 0.16% |
+776,885
| New | +$1.7M |
2026 Q1
0 quarters
|
|
|
SBNY
7
DELISTED
Signature Bank
SBNY
| $260K | 0.04% |
400,000
| – | – |
2024 Q1
8 quarters
|
|
|
8
Borr Drilling
BORR
$1.4B
| – | – |
-2,182,136
| Closed | -$8.79M | – |
|
|
9
Mesa Laboratories
MLAB
$715M
| – | – |
-70,300
| Closed | -$5.52M | – |
|
|
10
JBS N.V.
JBS
$41.8B
| – | – |
-1,306,000
| Closed | -$18.8M | – |
|
|
11
Solstice Advanced Materials
SOLS
$9.52B
| – | – |
-633,801
| Closed | -$30.8M | – |
|
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Mason Capital Management's Q1 2026 Portfolio in Review
As of Q1 2026, Mason Capital Management held 11 positions worth $613M, up 9.1% from $562M the previous quarter. Its ten largest holdings account for 100% of the portfolio.
Mason Capital Management deployed $28.6M of net new capital in Q1 2026, opening 2 new positions and adding to 2 existing holdings. Its largest new stake was Enviri: 4,494,536 shares worth $88.2M.
By sector, the portfolio is most concentrated in Industrials at 90% of assets, up from 76% a quarter earlier, followed by Healthcare and Communication Services.
On the sell side, the largest reduction was Brookdale Senior Living, an estimated $18.9M trimmed.
- Mason Capital Management's largest Q1 2026 buy was Enviri: 4,494,536 shares worth $88.2M.
- Mason Capital Management added most to ATS Corp in Q1 2026, an estimated $25.3M increase.
- Mason Capital Management's biggest Q1 2026 reduction was Brookdale Senior Living, cutting an estimated $18.9M.
- Mason Capital Management fully exited Solstice Advanced Materials in Q1 2026, selling an estimated $30.8M.
- Mason Capital Management's ten largest holdings make up 100% of its $613M portfolio in Q1 2026.
- Mason Capital Management opened 2 new positions and closed 4 in Q1 2026.
- Mason Capital Management's portfolio value rose 9.1% quarter-over-quarter to $613M.
Based on Mason Capital Management's 13F filing for Q1 2026, filed 15 May 2026.