DOSSIER · 13F-HR · Q1 2026
MARINER INVESTMENT GROUP LLC
MARINER INVESTMENT's family office based in Stamford, CT — $346M in tracked AUM across 108 positions as of Q1 2026.
MI
MARINER INVESTMENT·Stamford, CT·Family Office
CIK 0001096978 · last filed Mar 31, 2026
AI Analysis · Q1 2026 · Q1 2026
1. Portfolio Overview
Mariner Investment Group LLC manages a concentrated portfolio valued at approximately $287.52 million as of September 30, 2025. The portfolio experienced modest growth of +2.1% over the quarter, increasing from $281.70 million. The fund exhibits a high level of active management and turnover, evidenced by a dramatic restructuring where 26 new positions were initiated and 32 positions were sold during the quarter.
The portfolio is highly concentrate...
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
Filing history loading…