Marex adds fintech leader Georges Assi to board

Marex Group plc has appointed fintech entrepreneur and investment banker Georges Assi to its Group Board, effective immediately.

Rhea-AI Filing Summary

Marex Group plc has appointed fintech entrepreneur and investment banker Georges Assi to its Group Board, effective immediately. He will serve as a member of the Board’s Risk Committee, adding experience in credit, fixed income and technology-enabled lending.

Assi is CEO of Sigma Lending, a UK fintech lender he founded in 2023, and Co‑Founder and Partner of Naviter Capital, an investment firm focused on private credit markets. He previously held senior roles at Nomura International and Lehman Brothers. The company notes that the explanatory information in this report is incorporated by reference into its existing Form S‑8 and Form F‑3 registration statements.

Key Figures

Active clients: 3,400+ clients Employees: 3,000+ employees Offices: 50+ offices +2 more

5 metrics

Active clients 3,400+ clients Company description of client base

Employees 3,000+ employees Global workforce across regions

Offices 50+ offices Worldwide office locations

Exchange access 60+ exchanges Trading and market access footprint

Year-end reference Year ended December 31, 2025 Risk factor reference in 20-F

Key Terms

foreign private issuer, Risk Committee, forward-looking statements, Private Securities Litigation Reform Act of 1995, +1 more

5 terms

foreign private issuer regulatory

"FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO SECTION 13A-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Risk Committee financial

"Mr. Assi will serve as a member of the Risk Committee."

A risk committee is a group, usually part of a company’s board or senior leadership, tasked with spotting, assessing and guiding how the company manages threats to its finances, operations and compliance—think of it as a regular safety inspection for the business. Investors care because the committee’s work influences how likely the company is to avoid big losses, regulatory trouble or surprises that can hurt earnings and share value.

forward-looking statements regulatory

"This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995."

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

Private Securities Litigation Reform Act of 1995 regulatory

"forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995."

Form 20-F regulatory

"the risks discussed under the caption “Risk Factors” in our Annual Report on Form 20-F for the year ended December 31, 2025"

Form 20-F is the standardized annual disclosure that non-U.S. companies must file with the U.S. securities regulator when their shares are traded in the U.S.; it contains audited financial statements, a plain-language description of the business, management discussion, governance details and key risk factors. It matters to investors because it provides a consistent, comparable company “report card” and rulebook, helping buyers assess financial health, governance and risks before investing.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Marex Group plc (MRX) announce in this Form 6-K?

Marex Group plc announced the appointment of Georges Assi to its Group Board, effective immediately, and disclosed that he will serve on the Board’s Risk Committee, strengthening governance with additional credit and fintech expertise.

Who is Georges Assi, the new Marex Group (MRX) board member?

Georges Assi is a fintech entrepreneur and former investment banker. He is CEO of Sigma Lending, Co‑Founder and Partner of Naviter Capital, and previously led global credit and European fixed income businesses at Nomura and Lehman Brothers.

What board role will Georges Assi hold at Marex Group (MRX)?

Georges Assi joins the Marex Group Board and will serve on its Risk Committee. This role focuses on oversight of risk management, benefiting from his background in credit markets and technology-enabled lending businesses.

How does this Marex (MRX) 6-K relate to existing SEC registrations?

The report states that the information under the Explanatory Note is incorporated by reference into Marex’s existing Form S‑8 and Form F‑3 registration statements, making the board change part of those registered disclosure records.

What businesses has Marex’s new director Georges Assi founded?

Georges Assi founded Sigma Lending in 2023, a fintech lender providing UK SMEs with technology-enabled working capital, and co‑founded Naviter Capital in 2013, an investment firm specializing in private credit markets.

What is Marex Group plc’s core business footprint?

Marex Group plc provides market access, clearing, execution, market making, hedging and investment solutions across global commodity and financial markets, serving over 3,400 clients via more than 50 offices and access to over 60 exchanges.

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

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Accepted by SEC EDGAR 06/08/2026 - 04:01 PM EDT Learn about SEC filing dates

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 June 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 ☐

INCORPORATION BY REFERENCE

The information included in this Report on Form 6-K under “Explanatory Note” is hereby incorporated by reference into the Company’s Registration Statements on Form S-8 (File No. 333-278953) and Form F-3 (File Nos. 333-286884 and 333-289203) and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

EXPLANATORY NOTE

On June 8, 2026, Marex Group plc (the “Company”) announced the appointment of Georges Assi to the Company’s Board of Directors, effective immediately. Mr. Assi will serve as a member of the Risk Committee. A copy of the press release announcing Mr. Assi’s appointment is furnished herewith as Exhibit 99.1.

EXHIBIT INDEX

The following exhibits are furnished as part of this Form 6-K:

Exhibit No.		Description
99.1		Press Release Dated as of June 8, 2026

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: June 8, 2026				By:		/s/ Robert Irvin
						Robert Irvin
						Chief Financial Officer

Exhibit 99.1

Marex appoints Georges Assi to the Group Board

LONDON, June 8, 2026 – Marex Group plc (‘Marex’ or the ‘Group’; NASDAQ: MRX), the diversified global financial services platform, today announces it has appointed Georges Assi to the Group Board with immediate effect. Georges will serve as a member of the Risk Committee.

Georges is a fintech entrepreneur following many years as an investment banker in the credit and fixed income markets. He is the CEO of Sigma Lending, a fintech lender he founded in 2023 that provides UK small and medium-sized enterprises with access to working capital using technology-enabled underwriting. Georges is also the Co-Founder and Partner of Naviter Capital, an investment firm specialising in the private credit markets that he co-founded in 2013.

Prior to establishing Naviter in 2013, Georges worked as a Senior Managing Director at Nomura International. During his tenure, Georges ran the Global Credit business and the Fixed Income division in Europe. Before this, he spent eight years at Lehman Brothers in a variety of senior roles including Global Head of Structured Credit and European Head of Credit products, culminating in a role as co-Head of Fixed Income in Europe.

Robert Pickering, Chair of the Marex Board, commented:

“We are delighted to welcome Georges to the Marex Board. He brings a combination of demonstrable success as an entrepreneur and expertise in the fast-paced fintech industry, together with a solid grounding in investment banking and financial markets. We look forward to benefiting from his experience and insight, particularly in the use of innovation and technology to generate growth and scale at pace.”

Ends

Forward-Looking Statements:

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including the expected contribution to the company. In some cases, these forward-looking statements can be identified by words or phrases such as “may,” “will,” “expect,” “anticipate,” “aim,” “estimate,” “intend,” “plan,” “believe,” “potential,” “continue,” “is/are likely to” or other similar expressions.

These forward-looking statements are subject to risks, uncertainties and assumptions, some of which are beyond our control. In addition, these forward-looking statements reflect our current views with respect to future events and are not a guarantee of future performance. Actual outcomes may differ materially from the information contained in the forward-looking statements as a result of a number of factors, including, without limitation, the risks discussed under the caption “Risk Factors” in our Annual Report on Form 20-F for the year ended December 31, 2025, filed with the Securities and Exchange Commission (the “SEC”) and our other reports filed with the SEC. The forward-looking statements made in this press release relate only to events or information as of the date on which the statements are made

in this press release. Except as required by law, we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise, after the date on which the statements are made or to reflect the occurrence of unanticipated events. In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this press release, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain, and investors are cautioned not to unduly rely upon these statements.

About Marex: Marex Group plc (NASDAQ:MRX) provides market access, infrastructure services and essential liquidity to clients across global commodity and financial markets. The Group provides comprehensive breadth and depth of coverage across four services: Clearing, Agency and Execution, Market Making and Hedging and Investment Solutions. It has a leading franchise in many major metals, energy and agricultural products, with access to more than 60 exchanges. Marex has over 3,400 active clients, including some of the largest commodity producers, consumers and traders, banks, hedge funds and asset managers. With more than 50 offices worldwide, the Group has over 3000 employees across Europe, Asia and the Americas. For more information visit www.marex.com.

Enquiries please contact:

Marex: Nicola Ratchford / Adam Strachan

+44 778 654 8889 / +1 914 200 2508

nratchford@marex.com / astrachan@marex.com

FTI Consulting US / UK

+1 716 525 7239 / +44 7976870961

marex@fticonsulting.com

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Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 8.4 KB