Marex Group plc Ordinary Shares
Marex Group plc Ordinary Shares (MRX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MRX · as of Mar 31, 2025
Ownership Breakdown
129
Institutional Holders
▲ 20 vs Q4
$967.71M
Total Inst. Value
▲ $137.55M vs Q4
71.93M
Shares Outstanding
freeFloat 70.94%
27.40M
13F Shares Held
▲ 831,563 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MRX largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
CAPITAL INTERNATIONAL INVESTORS security & commodity brokers, dealers, exchanges & services | 3.03M | 4.32% | 4.32% | $107.18B | May 12, 2025 | ▲ 437.0K |
GRANAHAN INVESTMENT MANAGEMENT, LLC security & commodity brokers, dealers, exchanges & services | 2.12M | 3.01% | 3.01% | $74.77B | May 15, 2025 | ▼ 73.5K |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC security & commodity brokers, dealers, exchanges & services | 1.68M | 2.38% | 2.38% | $59.21B | May 9, 2025 | ▼ 828.4K |
JENNISON ASSOCIATES LLC security & commodity brokers, dealers, exchanges & services | 1.57M | 2.23% | 2.23% | $55.28B | May 5, 2025 | ▼ 498.6K |
ROYCE & ASSOCIATES LP security & commodity brokers, dealers, exchanges & services | 1.46M | 2.07% | 2.07% | $51.40B | May 6, 2025 | ▲ 6.1K |
LOOMIS SAYLES & CO L P security & commodity brokers, dealers, exchanges & services | 1.45M | 2.07% | 2.07% | $51.36B | May 14, 2025 | NEW |
GRANDEUR PEAK GLOBAL ADVISORS, LLC security & commodity brokers, dealers, exchanges & services | 1.30M | 1.84% | 1.84% | $45.75B | May 15, 2025 | ▲ 208.7K |
MORGAN STANLEY security & commodity brokers, dealers, exchanges & services | 1.00M | 1.42% | 1.42% | $35.36B | May 15, 2025 | ▼ 9.9K |
SPARTA 24 LTD. security & commodity brokers, dealers, exchanges & services | 974.1K | 1.39% | 1.39% | $34.41B | May 7, 2025 | — held |
BLACKROCK, INC. security & commodity brokers, dealers, exchanges & services | 793.7K | 1.13% | 1.13% | $28.03B | May 2, 2025 | ▼ 71.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
25
Increased
+2.43M shares6
New Positions
first time holders17
Decreased
−2.81M shares0
Sold Out
fully exitedNet shares change (top 50)
384.2K
+2.43M / −2.81M
Net new holders
+14
6 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MRX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
24
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Texier Thomas Group Head of Clearing | Jun 1, 2026 | Sale | 1,303 | $53.22 | $69.3K | 207.3K | Form 4 ↗ |
Texier Thomas Group Head of Clearing | Jun 1, 2026 | Sale | 269 | $53.98 | $14.5K | 207.0K | Form 4 ↗ |
Myers Linda Kristine director | Jun 1, 2026 | Tax Withhold | 1,115 | $52.94 | $59.0K | 21.1K | Form 4 ↗ |
Pietrowicz John W. director | Jun 1, 2026 | Tax Withhold | 558 | $52.94 | $29.5K | 21.7K | Form 4 ↗ |
Ing Sarah director | Jun 1, 2026 | Tax Withhold | 1,310 | $52.94 | $69.4K | 8.8K | Form 4 ↗ |
Lowitt Ian T Chief Executive Officer | May 22, 2026 | Tax Withhold | 39,478 | $54.45 | $2.15M | 2.87M | Form 4 ↗ |
Irvin Rob Chief Financial Officer | May 22, 2026 | Tax Withhold | 3,358 | $54.45 | $182.8K | 34.7K | Form 4 ↗ |
Van Den Born Simon President | May 22, 2026 | Tax Withhold | 43,712 | $54.45 | $2.38M | 1.47M | Form 4 ↗ |
Texier Thomas Group Head of Clearing | May 22, 2026 | Tax Withhold | 19,640 | $54.45 | $1.07M | 208.6K | Form 4 ↗ |
Tonucci Paolo See Remarks | May 22, 2026 | Tax Withhold | 31,080 | $54.45 | $1.69M | 1.32M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Marex Group plc Ordinary Shares (MRX) is primarily owned by institutional investors, who hold approximately 38.1% of total shares outstanding. Company insiders own approximately 29.06%, while retail and public investors account for the remaining 32.85%.
The largest institutional shareholder of Marex Group plc Ordinary Shares is CAPITAL INTERNATIONAL INVESTORS, holding approximately 3.03 million shares — equal to 4.32% of outstanding shares — as of March 31, 2025.
A total of 129 institutional investors currently hold MRX stock, with a combined institutional value of approximately $967,711,417 as of the most recent 13F filing period.
Frequently asked questions
MRX ownershipMarex Group plc Ordinary Shares (MRX) is primarily owned by institutional investors, who hold approximately 38.1% of shares. The largest shareholder is CAPITAL INTERNATIONAL INVESTORS with a 4.32% stake. Company insiders hold 29.06%. Data sourced from SEC Form 13F as of March 31, 2025.