Marex Group plc (MRX) Institutional Ownership

Ownership Summary

Marex Group Ltd (NASDAQ:MRX) has 202 institutional investors that have filed 13F reports for the period ending March 2026.

• Their combined ownership stood at 72.8% of outstanding shares in March 2026, up from 69.8% in December 2025.
• They increased total shares held in Marex by 10.03% from last quarter, and the number of investors in MRX increased 62.9% annually.
• Of these 202 funds, 119 grew their exposure to Marex, 60 cut back, and 23 maintained positions.
• In total, institutional investors held 52.22Mn shares in Marex as of March 2026, up by 4.76Mn shares quarter on quarter, and up 23.85Mn shares year over year.
• As of March 31, 2026, BlackRock, Inc. held the largest stake in Marex with 4.39Mn shares, accounting for 6.11% of total shares outstanding.
• The biggest buyers of Marex for the quarter ending March 2026 included FMR LLC (2.15Mn), PRICE T ROWE ASSOCIATES INC /MD/ (1.91Mn), TWO SIGMA INVESTMENTS, LP (778.44K), VICTORY CAPITAL MANAGEMENT INC (644.79K), SAMLYN CAPITAL, LLC (546.97K).
• The biggest sellers of Marex for the quarter ending March 2026 included ADAGE CAPITAL PARTNERS GP, L.L.C. (1.26Mn), BALYASNY ASSET MANAGEMENT L.P. (1.05Mn), THORNBURG INVESTMENT MANAGEMENT INC (693.27K), Grandeur Peak Global Advisors, LLC (454.55K), DEUTSCHE BANK AG\ (448.65K).
• Per Business Quant data, the top 10 holders of Marex for the quarter ending March 2026 are BlackRock, Inc. (4.39Mn), Capital International Investors (3.49Mn), FMR LLC (3.48Mn), LOOMIS SAYLES & CO L P (1.92Mn), PRICE T ROWE ASSOCIATES INC /MD/ (1.91Mn), ALLIANCEBERNSTEIN L.P. (1.73Mn), SAMLYN CAPITAL, LLC (1.69Mn), TWO SIGMA INVESTMENTS, LP (1.68Mn), JENNISON ASSOCIATES LLC (1.61Mn), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (1.57Mn).