Mason Capital Management LLC

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Mason Capital Management LLC
CRD #158797
SEC #801-73255
CIK #0001218735
AUM 2,237.5 M (2026-03-31)
Employees 15 (67% Investors, 0% Brokers)
Phone212-771-1200
Address110 E 59th Street
New York, NY 10022-1304
Source [IAPD] [EDGAR] [Website]
Total AUM ($B)
151296302004201120192027
Sector Form 13F Holdings Value ($B)
ATS Corp /ATS 0.5
Brookdale Senior Living Inc 0.0
Clear Channel Outdoor Holdings Inc 0.0
ZAIS Financial Corp 0.0
Jeld-Wen Holding Inc 0.0
 
 
 
 
 
 
Holdings by Sector ($B)
10.08.06.04.02.00.02011201620212027
Type Form D Funds Date Sold AUM
PE JETT Texas Company LLC [2025-03-31] 358.0 M 509.2 M
Filed 2024-12-17 (D) · Exemption 506(b), 3(c), 3(c)(7) · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
HF Mason Inflation Master Fund LP [2022-03-25] 21.7 M 28.7 M
Filed 2022-08-05 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
HF Mason Capital SPV III LLC 2019-03-31 6.3 M
HF Mason Capital Master Fund LP 2012-08-27 2,237.5 M
HF Mason Capital LP 2012-02-10 7.8 M
HF Mason Capital Ltd 2012-02-10 35.2 M
AUM Breakdown Accounts AUM ($B)
By Client Type
(a) Individuals (other than high net worth individuals) 0 0.0
(b) Individuals (high net worth individuals) 0 0.0
(c) Banking or thrift institutions 0 0.0
(d) Investment companies 0 0.0
(e) Business development companies 0 0.0
(f) Pooled investment vehicles 5 2.2
(g) Pension and profit sharing plans 0 0.0
(h) Charitable organizations 0 0.0
(i) State or municipal government entities 0 0.0
(j) Other investment advisers 0 0.0
(k) Insurance companies 0 0.0
(l) Sovereign wealth funds and foreign official institutions 0 0.0
(m) Corporations or other businesses not listed above 0 0.0
(n) Other 0 0.0
Total 5 2.2
By Discretionary
Discretionary 4 1.7
Non-Discretionary 1 0.5
Total 5 2.2
By Non-United States Persons
Non-United States Persons 0.5
United States Persons 1.7
Total 5 2.2
Limited Partners2011 - 2026
State Board of Administration of Florida
Form D Directors Role # Filings # Firms 2011 - 2026
Michael Martino Executive Officer 14 3
Kenneth Garschina Executive Officer 2 2
Mason Management LLC Executive Officer 2 2
Mason Capital Management LLC Promoter 2 2
Mason Inflation Management LLC Executive Officer 1 1
EDGAR Form CIK 2011 - 2026
13F-HR [0001218735]
3 [0001218735]
4 [0001218735]
SC 13D [0001218735]
SC 13G [0001218735]
Form 13D/13G Filer Form 13D/13G Subject Filed
Mason Capital Management LLC Enviri Corp [2026-07-14]
Mason Capital Management LLC Enviri Corp [2026-04-06]
Mason Capital Management LLC Veradigm Inc [2026-01-29]
Mason Capital Management LLC ATS Corp /ATS [2024-02-14]
Mason Capital Management LLC Colombier Acquisition Corp [2023-06-26]
Mason Capital Management LLC Corecivic Inc [2021-11-12]
Mason Capital Management LLC Legato Merger Corp [2021-08-16]
Mason Capital Management LLC Clear Channel Outdoor Holdings Inc [2020-03-12]
Mason Capital Management LLC CF Corp [2017-06-23]
Mason Capital Management LLC Madison Square Garden Co [2014-10-02]
Mason Capital Management LLC MENS Wearhouse Inc [2014-02-28]
Mason Capital Management LLC Health Management Associates Inc [2013-07-05]
Firm Profile (Form ADV)
Discretionary AUM$11.0B
ServesInstitutional
Fund TypesHedge Fund, Private Equity
LEICYLPQ00SO09K1E63I320
Form 3/4/5 Subject 2011 - 2026
Mason Capital Management LLC
Legato Merger Corp
Martino Michael E
Garschina Kenneth M
Mason Industrial Sponsor LLC
Mason Industrial Technology Inc
Babcock & Wilcox Co
Clear Channel Outdoor Holdings Inc
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Legato Merger Corp LEGO
Common Stock
2021-08-16 Sell 800 $11.33 9,064
Legato Merger Corp LEGO
Common Stock
2021-08-16 Sell 15,600 $11.27 175,812
Legato Merger Corp LEGO
"Common Stock, $0.0001 par value per share (""Common Stock"")."
2021-08-12 Buy 116,500 $11.50 1,339,750
Mason Industrial Technology Inc MIT
Class B common stock · derivative
2021-01-29 Other 437,500 $0.00
Babcock & Wilcox Co BWC
Common Stock, $.01 par value
2014-03-21 Sell 1,100,000 $32.80 36,080,000
Clear Channel Outdoor Holdings Inc CCO
Class A Common Stock, $.01 par value
2013-01-18 Sell 167,852 $7.49 1,257,211
Clear Channel Outdoor Holdings Inc CCO
Class A Common Stock, $.01 par value
2013-01-17 Sell 732,148 $7.49 5,483,789
Babcock & Wilcox Co BWC
Common Stock, $.01 par value
2013-01-09 Buy 2,800,000 $24.50 68,600,000
Babcock & Wilcox Co BWC
Common Stock, $.01 par value
2012-07-18 Buy 100,000 $25.14 2,514,000
Babcock & Wilcox Co BWC
Common Stock, $.01 par value
2012-06-06 Buy 302,493 $23.65 7,153,959
Babcock & Wilcox Co BWC
Common Stock, $.01 par value
2012-06-04 Buy 71,259 $23.36 1,664,610
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