UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO SECTION 13A-16 OR 15D-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of March 2026

Commission File Number: 001-42020

MAREX GROUP PLC

(Translation of registrant’s name into English)



155 Bishopsgate London EC2M 3TQ United Kingdom +44 20 7655 6000						140 East 45th Street, 10th Floor New York, New York 10017 (212) 618-2800

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

EXPLANATORY NOTE

Earnings Results

On March 3, 2026, Marex Group plc (the “Company”) issued a press release titled “Marex Group plc Announces Fourth Quarter and Full Year 2025 Results”. A copy of the press release is furnished as Exhibit 99.1 herewith.

EXHIBIT INDEX

The following exhibit is furnished as part of this Form 6-K:

Exhibit No.

Description

99.1

Press release dated March 3, 2026 titled “Marex Group plc Announces Fourth Quarter and Full Year 202 5 Results”

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Marex Group plc

Date: March 3, 2026

By:

/s/ Robert Irvin

Robert Irvin

Chief Financial Officer

Marex Group plc 6-K