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Super Investors MASON CAPITAL MANAGEMENT LLC
MC

MASON CAPITAL MANAGEMENT LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$607M
Positions
9
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (53 quarters reported)

$9.55B $209M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$5.01B in Q2 2013 → $607M now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Ats Corporation 77.8% Unchanged 16,404,170 $472M
Brookdale Senior Living Inc 6.8% Added 15% 2,575,826 $41.4M
Enviri Corp 6.4% Trimmed 61% 1,770,959 $38.9M
CC Clear Channel Outdoor Hldgs 3.9% Unchanged 9,828,401 $23.8M
Groupon Inc 2.6% New 657,144 $15.8M
Ready Capital Corp 1.2% Unchanged 4,319,933 $7.56M
Jeld-wen Holding Inc 0.8% Added 300% 3,109,621 $4.66M
Contextlogic Holdings Inc 0.4% New 291,341 $2.59M
SB Signature Bank 0.0% Unchanged 400,000 $180K

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
Enviri Corp Trimmed −2,723,577 −$59.8M 6.4%
Groupon Inc New +657,144 +$15.8M 2.6%
Brookdale Senior Living Inc Added +342,085 +$5.5M 6.8%
Jeld-wen Holding Inc Added +2,332,736 +$3.5M 0.8%
Contextlogic Holdings Inc New +291,341 +$2.59M 0.4%

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Enviri Corp New +4,494,536 +$88.2M 14.4%
SA Solstice Adv Materials Inc Exited −633,801 −$30.8M —
Ats Corporation Added +840,602 +$23.7M 75.5%
JN Jbs N.v. Exited −1,306,000 −$18.8M —
Brookdale Senior Living Inc Trimmed −1,352,200 −$18.5M 5.0%
Borr Drilling Ltd Exited −2,182,136 −$8.79M —
Mesa Laboratories Inc Exited −70,300 −$5.52M —
Jeld-wen Holding Inc New +776,885 +$963K 0.2%
Ready Capital Corp Added +543,794 +$881K 1.1%

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
Kenvue Inc Exited −2,595,000 −$42.1M —
SA Solstice Adv Materials Inc New +633,801 +$30.8M 5.5%
JN Jbs N.v. New +1,306,000 +$18.8M 3.4%
Brookdale Senior Living Inc Added +1,109,977 +$12M 6.9%
Borr Drilling Ltd New +2,182,136 +$8.79M 1.6%
Ready Capital Corp New +3,776,139 +$8.23M 1.5%

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
Kenvue Inc New +2,595,000 +$42.1M 8.6%
Brookdale Senior Living Inc New +2,475,964 +$21M 4.3%
Mesa Laboratories Inc New +70,300 +$4.71M 1.0%
CC Cohen Circle Acquisition Corp Exited −325,000 −$3.57M —

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
PG Paramount Global Exited −2,027,408 −$24.2M —

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
PG Paramount Global New +2,027,408 +$24.2M 5.7%
Ats Corporation Added +648,803 +$16.2M 90.8%
CC Cohen Circle Acquisition Corp New +325,000 +$3.64M 0.9%
Ready Capital Corp Exited −278,856 −$1.9M —

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
Veradigm Inc Exited −2,499,709 −$24.2M —
Barnes Group Inc Exited −548,218 −$22.2M —
Ready Capital Corp Trimmed −560,000 −$3.82M 0.4%

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

Company Action Shares changed Value of change % of portfolio
Barnes Group Inc Trimmed −501,861 −$20.3M 4.4%
Ats Corporation Added +565,000 +$16.4M 86.2%
Veradigm Inc Added +1,561,471 +$15.1M 4.8%
I3 Verticals Inc Exited −337,099 −$7.44M —
Ready Capital Corp New +838,856 +$6.4M 1.3%

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