MASON CAPITAL MANAGEMENT LLC

Q1 2026 13F-HR Holdings

Location
New York, NY
Holdings as of
3/31/2026
Date filed
5/15/2026
Form type
13F-HR
Num holdings
7
Total value ($000)
$612,853
Net value change ($000)
+51,248 (9.1%)
New positions
2
Sold out positions
4
Turnover %
25.0%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/17/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
NVRI 88,183 NEW
ATS 33,977 7.9%
CCO 1,572 7.2%
JELD 963 NEW
Top Reduces (Value $000, Stocks/ETFs)
SOLS -30,790 -100.0%
JBS -18,833 -100.0%
BORR -8,794 -100.0%
BKD -8,134 -21.0%
MLAB -5,519 -100.0%
RC -1,234 -15.0%
SBNY -144 -35.6%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type