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 |
| Neuberger Berman Group LLC | 0.00% | New | 22,460 | $862K |
| Dauntless Investment Group, LLC | 3.10% | New | 22,000 | $844K |
| Laurion Capital Management LP | 0.06% | New | 20,710 | $794K |
| Verition Fund Management LLC | 0.00% | Add +5.3% | 18,000 | $690K |
| Fox Run Management, L.L.C. | 0.11% | New | 17,995 | $690K |
| State of Alaska, Department of Revenue | 0.01% | New | 17,330 | $664K |
| Epacria Capital Partners, LLC | 0.51% | New | 16,607 | $637K |
| Los Angeles Capital Management LLC | 0.00% | Reduce -58.1% | 21,079 | $637K |
| Intech Investment Management LLC | 0.01% | Add +11.1% | 16,498 | $633K |
| Cibc World Market Inc. | 0.00% | Add +45.6% | 15,331 | $588K |
| HighTower Advisors, LLC | 0.00% | New | 14,505 | $556K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Reduce -2.3% | 14,281 | $548K |
| SG Americas Securities, LLC | 0.00% | Add +102.2% | 14,006 | $537K |
| Counterpoint Mutual Funds LLC | 0.04% | Reduce -11.1% | 13,116 | $503K |
| Corsair Capital Management, L.P. | 0.08% | Reduce -12.5% | 13,060 | $501K |
| Jane Street Group, LLC | 0.00% | Reduce -78.9% | 12,787 | $491K |
| Fred Alger Management, LLC | 0.00% | Add +3.0% | 12,766 | $490K |
| Royal Bank of Canada | 0.00% | Reduce -98.1% | 12,537 | $482K |
| Quantinno Capital Management LP | 0.00% | New | 12,544 | $481K |
| Natixis Advisors, LLC | 0.00% | New | 12,141 | $465K |
| D. E. Shaw & Co. | 0.00% | New | 12,068 | $463K |
| Walleye Capital LLC | 0.00% | Reduce -88.7% | 10,876 | $417K |
| Choreo, LLC | 0.01% | Reduce -2.9% | 10,168 | $394K |
| ProShare Advisors LLC | 0.00% | Add +9.4% | 10,072 | $386K |
| Janney Capital Management LLC | 0.02% | Add +1.8% | 10,056 | $386K |
| Jain Global LLC | 0.00% | Reduce -87.5% | 9,881 | $379K |
| Squarepoint Ops LLC | 0.00% | Reduce -95.3% | 9,617 | $369K |
| Clear Harbor Asset Management, LLC | 0.03% | Reduce -0.5% | 9,577 | $367K |
| Mangrove Partners Im, LLC | 0.03% | New | 8,970 | $344K |
| Voya Investment Management LLC | 0.00% | Add +6.2% | 8,875 | $340K |
| Dynamic Technology Lab Private Ltd | 0.07% | Add +24.4% | 8,530 | $327K |
| Keybank National Association | 0.00% | Add +0.0% | 7,861 | $302K |
| Virtu Financial LLC | 0.01% | New | 7,647 | $293K |
| Jump Financial, LLC | 0.00% | Reduce -93.2% | 7,515 | $288K |
| Amundi | 0.00% | New | 7,489 | $287K |
| Transcendent Capital Group LLC | 0.12% | New | 6,661 | $256K |
| Verdence Capital Advisors LLC | 0.01% | Reduce -18.9% | 6,363 | $244K |
| Lazard Asset Management LLC | 0.00% | New | 6,116 | $235K |
| Yorktown Management & Research Co Inc | 0.18% | New | 5,900 | $226K |
| US Bancorp \de | 0.00% | Add +13.6% | 5,390 | $207K |
| Mirabella Financial Services LLP | 0.02% | New | 5,265 | $202K |
| Ameritas Investment Partners, Inc. | 0.01% | No change | 4,498 | $173K |
| Neo Ivy Capital Management | 0.02% | New | 3,438 | $132K |
| California State Teachers Retirement System | 0.00% | Reduce -0.3% | 3,392 | $130K |
| Bessemer Group Inc. | 0.00% | No change | 3,260 | $125K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +112.1% | 3,239 | $124K |
| Cwm, LLC | 0.00% | Add +145.3% | 3,008 | $115K |
| Citigroup Inc. | 0.00% | Reduce -37.8% | 2,364 | $91K |
| Steward Partners Investment Advisory, LLC | 0.00% | Reduce -3.5% | 2,243 | $86K |
| Farther Finance Advisors, LLC | 0.00% | Add +69.8% | 2,242 | $86K |
| Amalgamated Bank | 0.00% | Add +59.1% | 1,731 | $66K |
| Sterling Capital Management LLC | 0.00% | Add +0.1% | 1,256 | $48K |
| Rockefeller Capital Management L.P. | 0.00% | Reduce -7.8% | 1,180 | $45K |
| Aster Capital Management (DIFC) Ltd | 0.02% | Reduce -48.6% | 1,135 | $44K |
| Larson Financial Group LLC | 0.00% | Add +1251.2% | 1,108 | $43K |
| Osaic Holdings, Inc. | 0.00% | Add +9.8% | 1,059 | $41K |
| EverSource Wealth Advisors, LLC | 0.00% | Add +45150.0% | 905 | $35K |
| Quadrant Capital Group LLC | 0.00% | Add +307.4% | 876 | $34K |
| Fifth Third Bancorp | 0.00% | New | 638 | $24K |
| Smartleaf Asset Management LLC | 0.00% | New | 582 | $23K |
| Stone House Investment Management, LLC | 0.00% | Add +24.1% | 386 | $15K |
| Park Place Capital Corp | 0.00% | Add +2.2% | 378 | $15K |
| Harbor Capital Advisors, Inc. | 0.00% | Reduce -1.6% | 365 | $14K |
| Jones Financial Companies LLLP | 0.00% | Reduce -42.9% | 320 | $12K |
| SBI Securities Co., Ltd. | 0.00% | Add +14.1% | 299 | $11K |
| Wilmington Savings Fund Society, FSB | 0.00% | New | 284 | $11K |
| Nisa Investment Advisors, LLC | 0.00% | No change | 280 | $11K |
| Signaturefd, LLC | 0.00% | Add +4466.7% | 274 | $11K |
| GAMMA Investing LLC | 0.00% | Add +82.4% | 166 | $6K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | New | 127 | $5K |
| Bell Investment Advisors, Inc | 0.00% | No change | 117 | $4K |
| MassMutual Private Wealth & Trust, FSB | 0.00% | New | 82 | $3K |
| WealthCollab, LLC | 0.00% | No change | 75 | $3K |
| Northwestern Mutual Wealth Management Co. | 0.00% | Reduce -34.0% | 64 | $2K |
| Allworth Financial LP | 0.00% | Reduce -37.5% | 55 | $2K |
| Covestor Ltd | 0.00% | New | 56 | $2K |
| MAI Capital Management | 0.00% | New | 51 | $2K |
| Assetmark, Inc. | 0.00% | Reduce -97.3% | 46 | $2K |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -24.5% | 37 | $1K |
| Global Retirement Partners, LLC | 0.00% | New | 34 | $1K |
| Parallel Advisors, LLC | 0.00% | New | 30 | $1K |
| Zions Bancorporation, National Association | 0.00% | New | 29 | $1K |
| CIBC Private Wealth Group LLC | 0.00% | No change | 23 | $882 |
| Rothschild Investment LLC | 0.00% | New | 19 | $729 |
| UMB Bank, n.a. | 0.00% | No change | 18 | $690 |
| IFP Advisors, Inc | 0.00% | Add +800.0% | 18 | $690 |
| Essential Partners LLC | 0.00% | Reduce -10.5% | 17 | $652 |
| TD Private Client Wealth LLC | 0.00% | New | 13 | $499 |
| Bogart Wealth, LLC | 0.00% | No change | 12 | $460 |
| Pinnacle Wealth Planning Services, Inc. | 0.00% | New | 8 | $307 |
| True Wealth Design, LLC | 0.00% | Reduce -82.9% | 6 | $231 |
"% of holder's portfolio" is MRX's weight in each manager's 13F, not the share of Marex UK Holdings Ltd. the manager owns.