John Grizzetti

Mason Capital Management Llc

Assets Managed

$612.853M

Holdings

Last Quarter

2026 - Q1

Filed Date

1mo 1d ago

Growth Rate

9.13%(2Q avg: 11.72%)

Sustained Growth

2 quarters

Portfolio positions

This chart displays the top 10 holdings in Mason Capital Management Llc's 2026 - Q1 portfolio, based on their 13F SEC filing, out of a total of 7 positions.

Assets under management

The assets under management (AUM) of Mason Capital Management Llc over the past 10 years (40 quarters) show continuous growth in total asset value over the last 2 quarters. As of the latest 13F SEC filing for 2026 - Q1, they manage 612.853M in assets, with a quarterly growth rate of 9.13% and a 2-quarter average growth rate of 11.72%. The portfolio is managed by John Grizzetti, and others.

Portfolio holdings

Investment	Portfolio %	Reported Value	Recent Activity
ATS Ats Corp Recent Activity Increased 5.41%	75.49%	$462.598M 16.404M shares@ $28.2 avg price	Increased 5.41%
NVRI Enviri Corp Recent Activity New Position	14.39%	$88.183M 4.495M shares@ $19.62 avg price	New Position
BKD Brookdale Senior Living Inc Recent Activity Decreased -37.7%	4.99%	$30.558M 2.234M shares@ $13.69 avg price	Decreased -37.7%
CCO Clear Channel Outdoor Holdin Recent Activity	3.81%	$23.293M 9.828M shares@ $2.37 avg price
RC Ready Capital Corp Recent Activity Increased 14.41%	1.15%	$6.998M 4.32M shares@ $1.62 avg price	Increased 14.41%
JELD Jeld-wen Holding Inc Recent Activity New Position	0.16%	$963,337 776,885 shares@ $1.24 avg price	New Position
SBNY Signature Bank Recent Activity	0.05%	$260,000 400,000 shares@ $0.65 avg price

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