DOSSIER · 13F-HR · Q1 2026
MASON CAPITAL MANAGEMENT LLC
MASON's asset manager based in Boston, MA — $613M in tracked AUM across 7 positions as of Q1 2026.
M
MASON·Boston, MA·Asset Manager
CIK 0001218735 · last filed Mar 31, 2026
AI Analysis · Q1 2026 · Q1 2026
Comprehensive Analysis of Mason Capital Management LLC 13F Filing
1. Portfolio Overview
Mason Capital Management LLC exhibits a highly concentrated investment strategy with this 13F filing for the period ending September 30, 2025. The firm manages a total portfolio value of approximately $470.38 million, spread across just five holdings. This represents a decrease of 8.0% from the previous quarter's value of $511.53 million. The reduction in portfolio value is likely attributable to market...
Quarter at a glance — Q1 2026
Position-change comparison pending.
No quarter-over-quarter changes available.
Top 10 holdings
By portfolio weight as of Q1 2026.
Filing history
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