SCHEDULE 13G/A

MAREX GROUP PLC

Common Stock, par value $0.001551 per share · CUSIP: G5S37H101

Event date: 2025-06-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• JRJ Investor 1 LP

  Shares: 7,160,826.00 · Class: 9.99%

• Amphitryon Limited (in liquidation)

  Shares: 7,160,826.00 · Class: 9.99%

• JRJ Group Limited

  Shares: 7,160,826.00 · Class: 9.99%

• Sir Jeremy Isaacs

  Shares: 7,160,826.00 · Class: 9.99%

• Mr. Roger Nagioff

  Shares: 7,160,826.00 · Class: 9.99%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.