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MASON CAPITAL MANAGEMENT LLC

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13F filer, CIK 1218735, NEW YORK, NY

MASON CAPITAL MANAGEMENT LLC reported $470,516,744 across 4 holdings for the quarter ended 2024-12-31, in a 13F-HR filed 2025-02-14.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001104659-25-014023

Period
2024-12-31
Reported value
$471M
Holdings
4
Top 10 weight
100%
New
0
Sold out
2

Largest buys vs the previous quarter

None.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
MDRXexited-2,499,709-$24.2M
BARNES GROUP INCexited-548,218-$22.2M
RCreduced-560,000-$3.82M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q4 2024

Share positions as resolved from 13F-HR 0001104659-25-014023, largest first. % of portfolio is the value over $470,516,744, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
ATSATS CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 14,914,765 shares; 2024Q4: 14,914,765 shares 14,914,765$455M96.62%0Timeline
CCOCLEAR CHANNEL OUTDOOR HLDGSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 9,828,401 shares; 2024Q4: 9,828,401 shares 9,828,401$13.5M2.86%0Timeline
RCREADY CAPITAL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 838,856 shares; 2024Q4: 278,856 shares 278,856$1.9M0.4%-560,000Timeline
SBNYSIGNATURE BANKQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 400,000 shares; 2024Q4: 400,000 shares 400,000$548K0.12%0Timeline

Sold out in Q4 2024

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
MDRXVERADIGM INC. COMMON STOCK(DE)2,499,709$24.2Mshares
BARNES GROUP INCBARNES GROUP INC548,218$22.2Mshares

How Q4 2024 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001104659-25-014023 base2025-02-14acceptance time not in the bulk data set