Marex Group (MRX) President discloses 1.54M-share holding on Form 3

Rhea-AI Filing Summary

Marex Group plc President Simon Van Den Born filed an initial ownership report showing direct holdings of 1,535,493 ordinary shares. This figure includes 383,741 shares underlying deferred bonus plan awards, which represent contingent rights to receive one ordinary share each upon vesting and settlement.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Van Den Born Simon

(Last) (First) (Middle)

C/O MAREX GROUP PLC

155 BISHOPSGATE

(Street)

LONDON EC2M 3TQ

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
Marex Group plc [ MRX ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	1,535,493(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The number of ordinary shares reported herein includes 383,741 shares underlying deferred bonus plan awards previously granted to the Reporting Person. Each award represents a contingent right to receive one (1) ordinary share of the Issuer upon vesting and settlement of the applicable award.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Scott Linsley, as Attorney-in-Fact	03/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does Marex Group (MRX) President Simon Van Den Born report on this Form 3?

He reports direct ownership of 1,535,493 ordinary shares of Marex Group plc. This is an initial ownership statement, providing the market with his reported equity stake as a company officer at the time of filing.

How many Marex Group (MRX) shares are tied to deferred bonus awards?

The filing states that 383,741 shares are underlying deferred bonus plan awards. Each award represents a contingent right to receive one ordinary share when the related award vests and is settled according to plan terms.

Does this Marex Group (MRX) Form 3 show any insider buying or selling?

No explicit purchases or sales are shown. The Form 3 functions as an initial ownership report, listing total ordinary shares and deferred bonus awards rather than recording new market transactions or changes in ownership direction.

Are the Marex Group (MRX) shares held by Simon Van Den Born direct or indirect?

The filing classifies the 1,535,493 ordinary shares as direct ownership. There is no indication in the data provided of indirect holdings through entities such as trusts, partnerships, or family investment vehicles.

What are deferred bonus plan awards mentioned in the Marex Group (MRX) filing?

Deferred bonus plan awards are compensation instruments granting a contingent right to receive ordinary shares in the future. In this case, 383,741 awards each correspond to one share, delivered only upon vesting and settlement of the applicable award.