Mason Capital Management LLC

Investment Portfolio & 13F Holdings Analysis

About

Type: FundHoldings: 5Value: $427.2MLatest: 2025Q1

MASON CAPITAL MANAGEMENT LLC is an institutional investment manager that filed its latest Form 13F for 2025Q1, reporting 5 holdings worth $0.4 billion. Form 13F filings provide transparency into the equity holdings of institutional investment managers with over $100 million in assets under management. This page displays the most recent portfolio holdings, allowing investors to track position changes, new investments, and portfolio composition.

AI_NATIVE detailed information: This accession holds the following tickers:[
  null,
  null,
  "PARA",
  "ATS",
  "CCO"
]

Filing Details

13F-HR • 2025-03-31

SEC FilingSEC DataHachi Filing

Report Date: 2025-03-31
Filing Date: 2025-05-15
Total Holdings: 5
Total Value: 427192325
Accession Number: 0001104659-25-049417
Form Type: 13F-HR
CIK: mason-capital-management
Manager Name: Mason-Capital-Management

Data Enrichment

60% identified

3 identified2 unidentified

Holdings

SEC FilingSEC DataHachi Filing

Manager:

5 positions • $427.2M total value

SEC FilingSEC DataHachi Filing

Manager:

Search and click to pin securities to the top

Sort by:

ATS Corp /ATS

ATS|00217Y104

Shares:15.6M

Value:$388.0M

% of Portfolio:90.8% ($388.0M/$427.2M)

Paramount Global

PARA|92556H206

Shares:2.0M

Value:$24.2M

% of Portfolio:5.7% ($24.2M/$427.2M)

Clear Channel Outdoor Holdings, Inc.

CCO|18453H106

Shares:9.8M

Value:$10.9M

% of Portfolio:2.6% ($10.9M/$427.2M)

G3730H106

Shares:325.0K

Value:$3.6M

% of Portfolio:0.9% ($3.6M/$427.2M)

82669G104

Shares:400.0K

Value:$392.0K

% of Portfolio:0.1% ($392.0K/$427.2M)

Instrument	Shares		Other Manager	Value	% of Portfolio
ATS Corp /ATS(ATScusip00217Y104)	15.6M	QoQ +4.35% (-648.8K) YoY +8.45% (-1.2M)	All Managers (Combined)	$388.0M	90.8% ($388.0M/$427.2M)	QoQ -14.65% (-$66.6M) YoY -40.67% (-$266.1M)
Paramount Global(PARAcusip92556H206)	2.0M	QoQ NEW(+2.0M) YoY NEW(+2.0M)	All Managers (Combined)	$24.2M	5.7% ($24.2M/$427.2M)	QoQ NEW(+$24.2M) YoY NEW(+$24.2M)
Clear Channel Outdoor Holdings, Inc.(CCOcusip18453H106)	9.8M	QoQ 0.00% (-0) YoY 0.00% (-0)	All Managers (Combined)	$10.9M	2.6% ($10.9M/$427.2M)	QoQ -18.97% (-$2.6M) YoY -32.72% (-$5.3M)
(cusipG3730H106)✕	325.0K	QoQ NEW(+325.0K) YoY NEW(+325.0K)	All Managers (Combined)	$3.6M	0.9% ($3.6M/$427.2M)	QoQ NEW(+$3.6M) YoY NEW(+$3.6M)
(cusip82669G104)✕	400.0K	QoQ 0.00% (-0) YoY 0.00% (-0)	All Managers (Combined)	$392.0K	0.1% ($392.0K/$427.2M)	QoQ -28.46% (-$156.0K) YoY -57.39% (-$528.0K)