Mason Capital Management LLC
Investment Portfolio & 13F Holdings Analysis
About
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
Filing Details
13F-HR • 2025-03-31- 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
- Manager Name
- Mason-Capital-Management
Data Enrichment
60% identified3 identified2 unidentified
Holdings
5 positions
Manager:
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Instrument | Shares | Other Manager | Value | ||
|---|---|---|---|---|---|
ATS Corp /ATS(ATScusip00217Y104) | 15.6M | All Managers (Combined) | $388.0M | ||
| 2.0M | QoQ NEW(+2.0M) YoY NEW(+2.0M) | All Managers (Combined) | $24.2M | QoQ NEW(+$24.2M) YoY NEW(+$24.2M) | |
| 9.8M | All Managers (Combined) | $10.9M | |||
(cusipG3730H106)✕ | 325.0K | QoQ NEW(+325.0K) YoY NEW(+325.0K) | All Managers (Combined) | $3.6M | QoQ NEW(+$3.6M) YoY NEW(+$3.6M) |
(cusip82669G104)✕ | 400.0K | All Managers (Combined) | $392.0K |