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MCM

Mason Capital Management Portfolio holdings

AUM $613M
1-Year Est. Return 21.43%
This Fund
S&P 500
This Quarter Est. Return
+4.41%
1 Year Est. Return
+21.43%
3 Year Est. Return
-17.99%
5 Year Est. Return
+51.94%
10 Year Est. Return
+270.99%
AUM
$613M
AUM Growth
+$51.2M
Cap. Flow
+$28.6M
Cap. Flow %
4.67%
Top 10 Hldgs %
100%
Holding
11
New
2
Increased
2
Reduced
1
Closed
4

Top Buys

Rank Stock Value
1
NVRI icon
Enviri
NVRI
+$83.5M
2
ATS icon
ATS Corp
ATS
+$25.3M
3
JELD icon
JELD-WEN Holding
JELD
+$1.7M
4
RC
Ready Capital
RC
+$1.04M

Top Sells

Rank Stock Value
1
SOLS
Solstice Advanced Materials
SOLS
+$30.8M
2
BKD icon
Brookdale Senior Living
BKD
+$18.9M
3
JBS
JBS N.V.
JBS
+$18.8M
4
BORR
Borr Drilling
BORR
+$8.79M
5
MLAB icon
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%

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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.