Comparable stake leader
JRJ Investor 1 Limited Partnership
SEC ownership of Marex Group plc
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001997464.
Disclosed value leader
JRJ Investor 1 Limited Partnership
Comparable rows
50/50
Latest evidence
01 Jun 2026
- Public ticker
- MRX on Nasdaq
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- JRJ Investor 1 Limited Partnership
- Latest 13D/G holder
- JRJ Investor 1 Limited Partnership
- Latest parsed ownership date
- 01 Jun 2026
- Issuer CIK
- 0001997464
- Issuer location
- London
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Marex Group plc (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
JRJ Investor 1 Limited Pa...
Disclosed value leader
JRJ Investor 1 Limited Pa...
Comparable rows
50/50
Latest evidence
01 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 10%
13D/G row: JRJ Investor 1 Limited Partnership
Showing 1-8 of 50 holder rows.
Quick read
JRJ Investor 1 Limited Partnership leads the comparable SEC ownership view at 10%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens JRJ Investor 1 Limited Partnership's linked filing trail.
Comparable ownership
Top 5
JRJ Investor 1 Limited Partnership
10%
MASP Investor Limited Partnership
7%
FMR LLC
5.1%
Ian T. Lowitt
3.9%
Simon van den Born
2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| JRJ Investor 1 Limited Partnership |
13D/G
JRJ Investor 1 LP
|
10%
|
$282,614,171
7,160,826 shares
|
$0 | 30 Jun 2025 |
| MASP Investor Limited Partnership |
13D/G
|
7%
|
$198,304,539
5,024,604 shares
|
$0 | 30 Jun 2025 |
| FMR LLC |
13D/G
13F
Company
|
5.1%
|
$174,959,070
3,724,911 shares
|
$0 | 31 Mar 2026 |
| Ian T. Lowitt |
3/4/5
Chief Executive Officer, Director
|
3.9%
|
$127,877,774
2,868,501 shares
|
— | 22 May 2026 |
| Simon van den Born |
3/4/5
President
|
2%
|
$65,320,934
1,465,252 shares
|
-$1,253,021 | 22 May 2026 |
| Paolo Tonucci |
3/4/5
Chief Strategist and CEO, Capital Markets
|
1.8%
|
$58,649,849
1,315,609 shares
|
-$1,788,185 | 22 May 2026 |
| Nilesh Jethwa |
3/4/5
CEO, Marex Solutions
|
0.34%
|
$11,027,041
247,354 shares
|
— | 22 May 2026 |
| Thomas Texier |
3/4/5
Group Head of Clearing
|
0.29%
|
$9,298,986
208,591 shares
|
-$1,392,203 | 22 May 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$4,433,409.
Buys
$0
Insiders: 0
Sells
$4,433,409
Insiders: 3
Net
-$4,433,409
Shares: -88,717
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 88,717
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 88,717 | $0 | $4,433,409 | -$4,433,409 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-11 of 11 reporting-owner rows connected to Marex Group plc. Open a relationship link for the CIK-to-CIK filing trail.
Rows
11
Largest Forms 3/4/5 holder
Ian T. Lowitt
Net 12M change
-$4,433,409
Latest report
01 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Ian T. Lowitt | Chief Executive Officer, Director | $127,877,774 | Median | 22 May 2026 | ||
| Simon van den Born | President | $65,320,934 | -$1,253,021 | -1.9% | Median | 22 May 2026 |
| Paolo Tonucci | Chief Strategist and CEO, Capital Markets | $58,649,849 | -$1,788,185 | -3% | Median | 22 May 2026 |
| Nilesh Jethwa | CEO, Marex Solutions | $11,027,041 | Median | 22 May 2026 | ||
| Thomas Texier | Group Head of Clearing | $9,298,986 | -$1,392,203 | -13% | Median | 22 May 2026 |
| Rob Irvin | Chief Financial Officer, Director | $1,548,976 | Median | 22 May 2026 | ||
| Robert Mark Pickering | Director | $1,246,341 | Mixed | 18 Mar 2026 | ||
| Schweinitz Konstantin Graf von | Director | $1,011,267 | Mixed | 18 Mar 2026 | ||
| John W. Pietrowicz | Director | $967,430 | Median | 01 Jun 2026 | ||
| Linda K. Myers | Director | $942,599 | Median | 01 Jun 2026 | ||
| Sarah Ing | Director | $417,268 | Median | 01 Jun 2026 |
Recent insider transactions for Marex Group plc
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Linda K. Myers | MRX | Ordinary Shares | Tax liability | -5.01% | -1,115 | 21,144 | 01 Jun 2026 | Direct | ||
| John W. Pietrowicz | MRX | Ordinary Shares | Tax liability | -2.51% | -558 | 21,701 | 01 Jun 2026 | Direct | ||
| Sarah Ing | MRX | Ordinary Shares | Tax liability | -12.9% | -1,310 | 8,825 | 01 Jun 2026 | Direct | ||
| Ian T. Lowitt | MRX | Ordinary Shares | Tax liability | -1.36% | -39,478 | 2,868,501 | 22 May 2026 | Direct | ||
| Rob Irvin | MRX | Ordinary Shares | Tax liability | -8.81% | -3,358 | 34,746 | 22 May 2026 | Direct | ||
| Thomas Texier | MRX | Ordinary Shares | Tax liability | -8.61% | -19,640 | 208,591 | 22 May 2026 | Direct | ||
| Simon van den Born | MRX | Ordinary Shares | Tax liability | -2.9% | -43,712 | 1,465,252 | 22 May 2026 | Direct | ||
| Nilesh Jethwa | MRX | Ordinary Shares | Tax liability | -13.8% | -39,661 | 247,354 | 22 May 2026 | Direct | ||
| Paolo Tonucci | MRX | Ordinary Shares | Tax liability | -2.31% | -31,080 | 1,315,609 | 22 May 2026 | Direct | ||
| Paolo Tonucci | MRX | Ordinary Shares | Sale | -1.22% | $932,136 | $55.92 | -16,668 | 1,346,689 | 11 May 2026 | Direct |
| Thomas Texier | MRX | Ordinary Shares | Sale | -5.95% | $764,487 | $52.99 | -14,427 | 228,231 | 01 May 2026 | Direct |
| Simon van den Born | MRX | Ordinary Shares | Sale | -0.87% | $675,916 | $50.95 | -13,265 | 1,508,964 | 20 Apr 2026 | Direct |
| Paolo Tonucci | MRX | Ordinary Shares | Sale | -1.21% | $856,049 | $51.36 | -16,666 | 1,363,357 | 13 Apr 2026 | Direct |
| Simon van den Born | MRX | Ordinary Shares | Sale | -0.86% | $577,105 | $43.51 | -13,264 | 1,522,229 | 01 Apr 2026 | Direct |
| Thomas Texier | MRX | Ordinary Shares | Sale | -5.61% | $627,715 | $43.51 | -14,427 | 242,658 | 01 Apr 2026 | Direct |
* marks a reported price that did not pass the local price check.