Marex Group plc (MRX) Institutional Ownership

Ownership Summary

Marex Group plc (NASDAQ:MRX) currently has 41 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

• Institutional ownership in Marex edged down to 6.2% in December 2025, compared to 83.2% in September 2025.
• In percentage terms, this reflects as a holdings change of -5.60% quarter on quarter, and an unavailable change year over year.
• Among the 41 institutional holders of Marex, 26 added to their stakes while 11 trimmed their positions and 4 held steady.
• Collectively, institutional investors decreased their stake in Marex to 3.82Mn shares as of December 2025, a change that is down by 226.49K shares quarter on quarter and down N/A shares year over year.
• The top institutional stake in Marex as of December 31, 2025 belongs to JENNISON ASSOCIATES LLC, which owns 1.48Mn shares, or 2.39% of the company.
• Among the most significant buyers of Marex during December 2025 were Swedbank AB (213.41K), Calamos Advisors LLC (83.21K), TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY (33.26K), Sparta 24 Ltd. (32.58K), MOODY ALDRICH PARTNERS LLC (28.84K).
• Leading sellers of Marex stock in December 2025 included PRINCIPAL FINANCIAL GROUP INC (434.95K), UBS Group AG (223.91K), VANGUARD GROUP INC (68.50K), STRS OHIO (2.30K), ASSETMARK, INC (1.68K).
• The top 10 institutional holders of Marex for the quarter ending December 2025 included JENNISON ASSOCIATES LLC (1.48Mn), Allspring Global Investments Holdings, LLC (814.73K), VANGUARD GROUP INC (399.96K), PRINCIPAL FINANCIAL GROUP INC (240.43K), Swedbank AB (213.41K), MOODY ALDRICH PARTNERS LLC (141.14K), UBS Group AG (110.09K), MOODY NATIONAL BANK TRUST DIVISION (98.23K), Calamos Advisors LLC (83.21K), TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY (72.50K).