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  • Gurus
  • Event Driven
  • MASON CAPITAL MANAGEMENT LLC (Data extracted from 13F, 13D, 13G and Form 4)

MASON CAPITAL MANAGEMENT LLC

AUM: $1.96 B
13-F Portfolio Value: $612.85 M
Last 13-F Filed: Q1 2026
Concentration in top 10: 100%
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Quarter to View:
Stock Company % Portfolio Shares Held Market Value Change in Shares % Change Quarter End Price Source
ATSATS CORPORATION73.33%16,404,170$462,597,594840,6025.4%$28.213F
NVRIENVIRI CORP13.98%4,494,536$88,182,7964,494,536New$19.6213F
BKDBROOKDALE SENIOR LIVING INC4.84%2,233,741$30,557,577-1,352,200-37.71%$13.6813F
CCOCLEAR CHANNEL OUTDOOR HLDGS3.69%9,828,401$23,293,310No Change$2.3713F
NVRIEnviri Corporation2.85%1,031,750$18,004,0381,031,750New13G
RCREADY CAPITAL CORP1.11%4,319,933$6,998,291543,79414.4%$1.6213F
JELDJELD-WEN HOLDING INC0.15%776,885$963,337776,885New$1.2413F
SBNYSIGNATURE BANK0.04%400,000$260,000No Change$0.6513F
MLABMESA LABORATORIES INC-70,300Exited13F
SOLSSOLSTICE ADV MATERIALS INC-633,801Exited13F
BORRBORR DRILLING LTD-2,182,136Exited13F
JBSJBS N.V.-1,306,000Exited13F