Marex UK HoldingsMRX
13F holders, Q4 2025 (December 31)191holders
42new positions
43sold out
5famous investors
$38.35avg. 13F price*
At the end of Q4 2025, 191 institutions reported holding Marex UK Holdings Ltd. (MRX) in their 13F filings, unchanged from Q3 2025. 42 opened new positions and 43 sold out. The largest holders were BlackRock, Inc. ($152.2M), Capital International Investors ($133.8M) and Loomis Sayles & Co. L P ($74.2M). 5 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Marex UK Holdings Ltd.
- Filed as
- MAREX GROUP PLC (Q4 2025)
- CUSIP
- G5S37H101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 42 | $111.1M |
| Exits | 43 | $105.6M |
All 13F filers, Q3 2025 → Q4 2025: 9,047,970 shares bought and 9,372,356 shares sold, net −324,386 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 191 holders
| BlackRock, Inc. | 0.00% | Add +6.8% | 3,966,534 | $152.2M |
| Capital International Investors | 0.02% | No change | 3,488,093 | $133.8M |
| Loomis Sayles & Co. L P | 0.09% | Add +8.3% | 1,935,503 | $74.2M |
| Grandeur Peak Global Advisors, LLC | 9.19% | Add +1.5% | 1,779,743 | $68.3M |
| Alliancebernstein L.P. | 0.02% | Add +12.3% | 1,750,252 | $67.1M |
| William Blair Investment Management, LLC | 0.19% | Add +372.0% | 1,738,927 | $66.7M |
| T. Rowe Price Associates Inc. | 0.01% | Add +27.9% | 1,548,637 | $59.4M |
| Jennison Associates LLC | 0.03% | Add +1.5% | 1,475,255 | $56.6M |
| Balyasny Asset Management L.P. | 0.10% | Add +16.2% | 1,396,390 | $53.6M |
| Granahan Investment Management, LLC | 2.26% | Add +30.5% | 1,376,993 | $52.8M |
| FMR LLC | 0.00% | Add +76.5% | 1,334,798 | $51.2M |
| Adage Capital Partners Gp, L.L.C. | 0.08% | Reduce -2.0% | 1,305,455 | $50.1M |
| Invesco Ltd. | 0.00% | Add +6.8% | 1,294,978 | $49.7M |
| Royce & Associates LP | 0.49% | Reduce -11.2% | 1,260,709 | $48.4M |
| Samlyn Capital, LLC | 0.70% | Add +43.1% | 1,141,911 | $43.8M |
| Healthcare of Ontario Pension Plan Trust Fund | 0.07% | Add +3.7% | 1,114,349 | $42.7M |
| Thornburg Investment Management Inc. | 0.53% | Add +5.0% | 1,102,143 | $42.3M |
| Ophir Asset Management Pty Ltd | 4.68% | New | 1,087,160 | $41.7M |
| Artisan Partners Limited Partnership | 0.05% | Add +68.5% | 904,957 | $34.7M |
| Two Sigma Investments, LP | 0.05% | Reduce -3.3% | 903,123 | $34.6M |
| Ameriprise Financial Inc. | 0.01% | Reduce -1.5% | 860,024 | $33.0M |
| State Street Corp. | 0.00% | Add +5.8% | 839,536 | $32.2M |
| Allspring Global Investments Holdings, LLC | 0.05% | Reduce -0.1% | 814,733 | $30.9M |
| Qube Research & Technologies Ltd | 0.04% | Reduce -26.6% | 763,460 | $29.3M |
| Wellington Management Group LLP | 0.01% | Add +65.9% | 759,836 | $29.1M |
| Geode Capital Management, LLC | 0.00% | Add +1.3% | 709,724 | $27.2M |
| Two Sigma Advisers, LP | 0.05% | Reduce -15.5% | 679,600 | $26.1M |
| Victory Capital Management Inc. | 0.01% | New | 670,025 | $25.7M |
| Westwood Holdings Group Inc. | 0.18% | Reduce -5.5% | 564,236 | $21.6M |
| Morgan Stanley | 0.00% | Reduce -30.1% | 554,490 | $21.3M |
| Praetorian PR LLC | 9.30% | Add +25.0% | 500,000 | $19.2M |
| Deutsche Bank AG | 0.01% | Add +1105.3% | 496,560 | $19.0M |
| Deltroit Asset Management (UK) LLP | 2.98% | — | 474,773 | $18.2M |
| Bank of New York Mellon Corp | 0.00% | Add +34.4% | 435,772 | $16.7M |
| Voloridge Investment Management, LLC | 0.06% | Reduce -37.3% | 422,471 | $16.2M |
| Portolan Capital Management, LLC | 0.86% | New | 418,745 | $16.1M |
| Vanguard Group Inc. | 0.00% | Reduce -14.6% | 399,956 | $15.3M |
| Nuveen, LLC | 0.00% | Add +4.2% | 381,008 | $14.6M |
| Sei Investments Co. | 0.01% | Add +0.5% | 351,583 | $13.5M |
| Glenmede Trust Co. NA | 0.06% | — | 326,415 | $12.5M |
| Manufacturers Life Insurance Company, The | 0.01% | Reduce -3.7% | 312,493 | $12.0M |
| Algert Global LLC | 0.19% | Add +15.0% | 312,351 | $12.0M |
| Russell Investments Group, Ltd. | 0.01% | Add +32.6% | 310,452 | $11.9M |
| Bank of America Corp. | 0.00% | Reduce -26.5% | 286,692 | $11.0M |
| Northern Trust Corp. | 0.00% | Reduce -10.1% | 275,919 | $10.6M |
| BNP Paribas Financial Markets | 0.01% | Reduce -46.0% | 251,535 | $9.6M |
| Seven Grand Managers, LLC | 0.73% | No change | 250,000 | $9.6M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -42.4% | 244,620 | $9.4M |
| Principal Financial Group Inc. | 0.00% | Reduce -64.4% | 240,432 | $9.2M |
| Lord, Abbett & Co. LLC | 0.03% | Add +2.4% | 227,255 | $8.7M |
| JPMorgan Chase & Co. | 0.00% | Reduce -70.0% | 223,489 | $8.6M |
| Renaissance Technologies | 0.01% | Reduce -57.1% | 220,787 | $8.5M |
| Globeflex Capital L P | 1.27% | Add +2.8% | 215,606 | $8.3M |
| Swedbank AB | 0.01% | New | 213,413 | $8.2M |
| Renaissance Group LLC | 0.30% | Reduce -7.7% | 194,680 | $7.5M |
| Engle Capital Management, L.P. | 2.83% | Reduce -42.2% | 190,900 | $7.3M |
| North Reef Capital Management LP | 0.29% | Add +264.1% | 190,000 | $7.3M |
| New York State Common Retirement Fund | 0.01% | Add +86.3% | 163,281 | $6.3M |
| State of Wisconsin Investment Board | 0.01% | Add +7.9% | 159,527 | $6.1M |
| Creative Planning | 0.00% | Add +30.6% | 157,610 | $6.0M |
| Alyeska Investment Group, L.P. | 0.02% | Reduce -56.8% | 152,375 | $5.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -7.7% | 147,491 | $5.7M |
| Moody Aldrich Partners LLC | 1.01% | Add +25.7% | 141,140 | $5.4M |
| Marshall Wace, LLP | 0.00% | Reduce -82.6% | 114,417 | $4.4M |
| UBS Group AG | 0.00% | Reduce -67.0% | 110,094 | $4.2M |
| Marex Group Ltd | 0.04% | Add +69.2% | 103,500 | $4.0M |
| Legal & General Group Plc | 0.00% | Add +58.1% | 99,901 | $3.8M |
| Moody National Bank Trust Division | 0.36% | Add +31.9% | 98,230 | $3.8M |
| Trexquant Investment LP | 0.03% | Reduce -4.3% | 98,167 | $3.8M |
| Citadel Advisors | 0.00% | Reduce -83.0% | 90,059 | $3.5M |
| Barclays PLC | 0.00% | Add +7.3% | 85,867 | $3.3M |
| Calamos Advisors LLC | 0.02% | New | 83,206 | $3.2M |
| Millennium Management | 0.00% | Reduce -75.3% | 82,779 | $3.2M |
| FJ Capital Management LLC | 0.34% | Reduce -15.1% | 81,199 | $3.1M |
| Federated Hermes, Inc. | 0.00% | Add +68.1% | 74,574 | $2.9M |
| Teachers Retirement System of the State of Kentucky | 0.02% | Add +84.8% | 72,497 | $2.8M |
| Raymond James Financial Inc. | 0.00% | Add +13.4% | 71,907 | $2.8M |
| Rhumbline Advisers | 0.00% | Reduce -8.3% | 65,244 | $2.5M |
| Wells Fargo & Company | 0.00% | Add +66.4% | 63,901 | $2.5M |
| Mariner, LLC | 0.00% | Add +175.0% | 62,188 | $2.4M |
| Franklin Resources Inc. | 0.00% | Add +32.9% | 60,419 | $2.3M |
| Mackenzie Financial Corp. | 0.00% | Add +87.2% | 54,067 | $2.1M |
| Boston Partners | 0.00% | New | 50,139 | $1.9M |
| Main Street Financial Solutions, LLC | 0.14% | Add +11.1% | 50,000 | $1.9M |
| Cinctive Capital Management LP | 0.11% | Reduce -44.4% | 50,000 | $1.9M |
| Y-Intercept (Hong Kong) Ltd | 0.04% | Reduce -27.7% | 44,349 | $1.7M |
| Militia Capital Partners, LP | 0.58% | Add +11.1% | 40,000 | $1.5M |
| Envestnet Asset Management Inc. | 0.00% | Reduce -44.3% | 38,559 | $1.5M |
| Public Employees Retirement System of Ohio | 0.00% | New | 38,204 | $1.5M |
| Quantbot Technologies LP | 0.05% | Add +40.4% | 36,535 | $1.4M |
| Sparta 24 Ltd. | 1.07% | New | 32,581 | $1.2M |
| Wasatch Advisors LP | 0.01% | New | 30,992 | $1.2M |
| MetLife Investment Management, LLC | 0.01% | Reduce -4.0% | 30,323 | $1.2M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +2.4% | 25,614 | $983K |
| Sanctuary Advisors, LLC | 0.01% | New | 25,264 | $969K |
| AQR Capital Management | 0.00% | Add +200.0% | 25,221 | $967K |
| HRT Financial LP | 0.00% | New | 24,606 | $943K |
| Orion Porfolio Solutions, LLC | 0.01% | Add +152.6% | 23,508 | $902K |
| STRS Ohio | 0.00% | Reduce -9.0% | 23,200 | $890K |
| Engineers Gate Manager LP | 0.01% | Reduce -77.3% | 22,586 | $866K |
"% of holder's portfolio" is MRX's weight in each manager's 13F, not the share of Marex UK Holdings Ltd. the manager owns.