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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
+7.55%
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
$562M
AUM Growth
+$70.3M
Cap. Flow
+$34.4M
Cap. Flow %
6.12%
Top 10 Hldgs %
100%
Holding
10
New
4
Increased
1
Reduced
–
Closed
1
Avg Time Held
1.3 years
Top 10 Avg Time Held
1.3 years
Top 20 Avg Time Held
1.3 years

Top Buys

Rank Stock Value
1
SOLS icon
Solstice Advanced Materials
SOLS
+$29.8M
2
JBS icon
JBS N.V.
JBS
+$17.9M
3
BKD icon
Brookdale Senior Living
BKD
+$10.9M
4
RC icon
Ready Capital
RC
+$10.6M
5
BORR icon
Borr Drilling
BORR
+$7.23M

Top Sells

Rank Stock Value
1
KVUE icon
Kenvue
KVUE
+$42.1M

Sector Composition

Rank Sector Weight
1 Industrials 76.32%
2 Healthcare 6.89%
3 Materials 5.48%
4 Communication Services 3.87%
5 Consumer Staples 3.35%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow Held Since
ATS icon
1
ATS Corp
ATS
$1.78B
$429M 76.32%
15,563,568
– –
2023 Q2
10 quarters
BKD icon
2
Brookdale Senior Living
BKD
$2.41B
$38.7M 6.89%
3,585,941
+1,109,977
+45% +$10.9M
2025 Q3
1 quarter
SOLS icon
3
Solstice Advanced Materials
SOLS
$9.52B
$30.8M 5.48%
+633,801
New +$29.8M
2025 Q4
0 quarters
CCO icon
4
Clear Channel Outdoor Holdings
CCO
$1.23B
$21.7M 3.87%
9,828,401
– –
2019 Q2
26 quarters
JBS icon
5
JBS N.V.
JBS
$41.8B
$18.8M 3.35%
+1,306,000
New +$17.9M
2025 Q4
0 quarters
BORR icon
6
Borr Drilling
BORR
$1.4B
$8.79M 1.57%
+2,182,136
New +$7.23M
2025 Q4
0 quarters
RC icon
7
Ready Capital
RC
$185M
$8.23M 1.47%
+3,776,139
New +$10.6M
2025 Q4
0 quarters
MLAB icon
8
Mesa Laboratories
MLAB
$715M
$5.52M 0.98%
70,300
– –
2025 Q3
1 quarter
SBNY
9
DELISTED
Signature Bank
SBNY
$404K 0.07%
400,000
– –
2024 Q1
7 quarters
KVUE icon
10
Kenvue
KVUE
$35.9B
– –
-2,595,000
Closed -$42.1M –

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Mason Capital Management's Q4 2025 Portfolio in Review

As of Q4 2025, Mason Capital Management held 10 positions worth $562M, up 14% from $491M the previous quarter. Its ten largest holdings account for 100% of the portfolio.

Mason Capital Management deployed $34.4M of net new capital in Q4 2025, opening 4 new positions and adding to 1 existing holding. Its largest new stake was Solstice Advanced Materials: 633,801 shares worth $30.8M.

By sector, the portfolio is most concentrated in Industrials at 76% of assets, down from 83% a quarter earlier, followed by Healthcare and Materials.

On the sell side, the most notable exit was Kenvue, an estimated $42.1M sold.

  • Mason Capital Management's largest Q4 2025 buy was Solstice Advanced Materials: 633,801 shares worth $30.8M.
  • Mason Capital Management added most to Brookdale Senior Living in Q4 2025, an estimated $10.9M increase.
  • Mason Capital Management fully exited Kenvue in Q4 2025, selling an estimated $42.1M.
  • Mason Capital Management's ten largest holdings make up 100% of its $562M portfolio in Q4 2025.
  • Mason Capital Management opened 4 new positions and closed 1 in Q4 2025.
  • Mason Capital Management's portfolio value rose 14% quarter-over-quarter to $562M.

Based on Mason Capital Management's 13F filing for Q4 2025, filed 17 Feb 2026.