Marex Group (MRX) CEO has 39,478 shares withheld for taxes on vesting

Rhea-AI Filing Summary

Marex Group plc Chief Executive Officer Ian T. Lowitt reported a routine tax-related share disposition. On this Form 4, 39,478 ordinary shares were withheld to satisfy tax withholding obligations tied to the vesting of previously granted deferred bonus plan awards, rather than being sold on the open market.

After this withholding, Lowitt directly holds 2,868,501 ordinary shares. This figure includes 194,411 shares underlying deferred bonus plan awards that represent contingent rights to receive one ordinary share each upon future vesting and settlement.

Insider Trade Summary

Net Seller: 39,478 shares

Net Sell 1 txn

Insider Lowitt Ian T

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Ordinary Shares	39,478	$54.45	$2.15M

Holdings After Transaction: Ordinary Shares — 2,868,501 shares (Direct)

Footnotes (3)

1. F1. Represents the number of ordinary shares withheld to satisfy the tax withholding obligation in connection with the vesting of certain previously reported shares underlying deferred bonus plan awards.
2. F2. The price reported represents the closing price of the Issuer's ordinary shares on the Nasdaq Stock Market LLC on May 21, 2026.
3. F3. The number of ordinary shares reported herein includes 194,411 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.

Key Figures

Tax-withheld shares: 39,478 shares Reference share price: $54.45 per share Shares held after transaction: 2,868,501 shares +1 more

4 metrics

Tax-withheld shares 39,478 shares Ordinary shares withheld for tax on vesting of deferred bonus awards

Reference share price $54.45 per share Closing price on Nasdaq on May 21, 2026, used for reporting

Shares held after transaction 2,868,501 shares Ordinary shares directly owned by Ian T. Lowitt following withholding

Deferred bonus plan awards 194,411 shares Awards each representing a contingent right to one ordinary share

Key Terms

tax withholding obligation, deferred bonus plan awards, contingent right, vesting

4 terms

tax withholding obligation financial

"shares withheld to satisfy the tax withholding obligation in connection with the vesting"

deferred bonus plan awards financial

"in connection with the vesting of certain previously reported shares underlying deferred bonus plan awards"

Deferred bonus plan awards are payments promised to employees or executives that are earned now but paid out later, often only if certain performance goals are met or the employee remains with the company. For investors, they matter because they influence management’s incentives and company expenses over time—like a delayed paycheck that encourages someone to stay and meet targets—and can affect future cash needs, reported compensation costs, and potential share dilution.

contingent right financial

"Each award represents a contingent right to receive one (1) ordinary share"

vesting financial

"in connection with the vesting of certain previously reported shares underlying deferred bonus plan awards"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 05/27/2026 - 04:05 PM Learn about SEC filing dates

FAQ

What did Marex Group (MRX) CEO Ian T. Lowitt report on this Form 4?

Ian T. Lowitt reported that 39,478 Marex Group ordinary shares were disposed of through tax withholding. The shares were withheld to cover tax obligations from vesting deferred bonus plan awards, rather than sold in an open-market transaction.

Were Marex Group (MRX) shares actually sold in the market by the CEO?

No, the 39,478 Marex Group shares were withheld to satisfy tax obligations, not sold in the open market. This type of transaction is a non-discretionary tax-withholding disposition connected to the vesting of previously granted deferred bonus plan awards.

How many Marex Group (MRX) shares does the CEO hold after this transaction?

After the tax-withholding disposition, Ian T. Lowitt holds 2,868,501 Marex Group ordinary shares directly. This total includes 194,411 shares underlying deferred bonus plan awards, which are contingent rights that convert into ordinary shares upon vesting and settlement.

What price per share is referenced in the Marex Group (MRX) Form 4?

The Form 4 references a price of $54.45 per Marex Group ordinary share. This reflects the closing price on the Nasdaq Stock Market LLC on May 21, 2026, and is used for reporting purposes in connection with the tax-withholding event.

What are the deferred bonus plan awards mentioned for Marex Group (MRX) CEO?

Deferred bonus plan awards are equity-based incentives that vest over time. For Ian T. Lowitt, 194,411 Marex Group awards each represent a contingent right to receive one ordinary share upon vesting and settlement, contributing to his reported share position.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Lowitt Ian T

(Last) (First) (Middle)

C/O MAREX GROUP PLC, 155 BISHOPSGATE

(Street)

LONDON UNITED KINGDOM EC2M 3TQ

(City) (State) (Zip)

UNITED KINGDOM

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	05/22/2026		F		39,478(1)	D	$54.45(2)	2,868,501(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the number of ordinary shares withheld to satisfy the tax withholding obligation in connection with the vesting of certain previously reported shares underlying deferred bonus plan awards.

2. The price reported represents the closing price of the Issuer's ordinary shares on the Nasdaq Stock Market LLC on May 21, 2026.

3. The number of ordinary shares reported herein includes 194,411 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.

	/s/ Scott Linsley as Attorney-in-Fact, for Ian T. Lowitt	05/27/2026
	** 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 4 (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 4: SEC 1474 (03-26)