MAREX GROUP PLC (MRX) Institutional Ownership and Insiders Activity

MAREX GROUP PLC (MRX) is widely held by institutional investors, with 1 tracked firm reporting positions valued at approximately $3.59M based on SEC Form 13F filings for the quarter ended March 31, 2026.

Renaissance Technologies LLC is the largest disclosed holder, reporting approximately $3.59M in MRX holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Renaissance Technologies LLC representing the majority of disclosed value.

Recent insider activity includes 28 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.