Marex Group plc
Ownership
Ownership Structure
Who owns Marex Group plc (MRX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 91.9% of the shares are freely tradable; institutional investors hold 75.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.10 | 4,389,325 | +10.7 | 03/31/2026 |
| FMR Inc | 4.84 | 3,481,911 | +160.9 | 03/31/2026 |
| Capital Research & Mgmt Co - Division 3 | 4.54 | 3,264,364 | -6.4 | 06/30/2026 |
| T. Rowe Price Associates, Inc. | 2.65 | 1,906,029 | +23.1 | 03/31/2026 |
| AllianceBernstein L.P. | 2.41 | 1,730,125 | -1.1 | 03/31/2026 |
| Wasatch Advisors LP | 2.34 | 1,683,061 | +883.6 | 06/30/2026 |
| Loomis, Sayles & Company LP | 2.26 | 1,626,702 | -15.2 | 06/30/2026 |
| Samlyn Capital, LLC | 2.06 | 1,483,250 | -12.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| American Funds SMALLCAP World A | 4.42 | 3,176,679 | -8.9 | 06/30/2026 |
| iShares Russell 2000 ETF | 2.23 | 1,603,115 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Lowitt Ian T | Chief Executive Officer | 2,835,472 | 207,840,098 $ | Sep 7, 2026 | direct |
| Van Den Born Simon | President | 1,470,348 | 107,776,508 $ | Sep 14, 2026 | direct |
| Tonucci Paolo | See Remarks | 1,269,571 | 93,059,554 $ | Sep 14, 2026 | direct |
| Jethwa Nilesh | CEO, Marex Solutions | 282,950 | 20,740,235 $ | Sep 7, 2026 | direct |
| Irvin Rob | Chief Financial Officer | 31,046 | 2,275,672 $ | Aug 14, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 14, 2026 | Tonucci Paolo | See Remarks | Sell | 2,952 | 71.35 | 210,638 |
| Sep 14, 2026 | Tonucci Paolo | See Remarks | Sell | 13,714 | 70.77 | 970,529 |
| Sep 14, 2026 | Van Den Born Simon | President | Sell | 2,655 | 71.36 | 189,457 |
| Sep 14, 2026 | Van Den Born Simon | President | Sell | 12,616 | 70.77 | 892,820 |
| Sep 7, 2026 | Tonucci Paolo | See Remarks | Other | 18,293 | 78.27 | 1,431,793 |
| Sep 7, 2026 | Van Den Born Simon | President | Other | 13,215 | 78.27 | 1,034,338 |
| Sep 7, 2026 | Jethwa Nilesh | CEO, Marex Solutions | Other | 31,567 | 78.27 | 2,470,749 |
| Sep 7, 2026 | Lowitt Ian T | Chief Executive Officer | Other | 36,587 | 78.27 | 2,863,664 |
| Aug 19, 2026 | Jethwa Nilesh | CEO, Marex Solutions | Other | 67,163 | 0.00 | – |
| Aug 19, 2026 | Tonucci Paolo | See Remarks | Other | 38,921 | 0.00 | – |
| Aug 19, 2026 | Van Den Born Simon | President | Other | 33,582 | 0.00 | – |
| Aug 19, 2026 | Lowitt Ian T | Chief Executive Officer | Other | 77,843 | 0.00 | – |
| Aug 14, 2026 | Irvin Rob | Chief Financial Officer | Sell | 200 | 71.87 | 14,373 |
| Aug 14, 2026 | Irvin Rob | Chief Financial Officer | Sell | 3,500 | 70.91 | 248,172 |
| Aug 10, 2026 | Tonucci Paolo | See Remarks | Sell | 455 | 62.22 | 28,311 |
| Aug 10, 2026 | Tonucci Paolo | See Remarks | Sell | 3,963 | 61.62 | 244,194 |
| Aug 10, 2026 | Tonucci Paolo | See Remarks | Sell | 12,250 | 60.64 | 742,842 |
| Jul 13, 2026 | Tonucci Paolo | See Remarks | Sell | 232 | 65.73 | 15,249 |
| Jul 13, 2026 | Tonucci Paolo | See Remarks | Sell | 4,584 | 64.85 | 297,271 |
| Jul 13, 2026 | Tonucci Paolo | See Remarks | Sell | 11,850 | 64.22 | 761,058 |
| Jul 13, 2026 | Lowitt Ian T | Chief Executive Officer | Sell | 787 | 65.84 | 51,819 |
| Jul 13, 2026 | Lowitt Ian T | Chief Executive Officer | Sell | 8,957 | 64.90 | 581,325 |
| Jul 13, 2026 | Lowitt Ian T | Chief Executive Officer | Sell | 27,398 | 64.19 | 1,758,560 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.