Marex UK HoldingsMRX
13F holders, Q1 2026 (March 31)205holders +14
38new positions
22sold out
3famous investors
$44.34avg. 13F price*
At the end of Q1 2026, 205 institutions reported holding Marex UK Holdings Ltd. (MRX) in their 13F filings, up 14 from Q4 2025. 38 opened new positions and 22 sold out. The largest holders were BlackRock, Inc. ($195.7M), Capital International Investors ($155.5M) and FMR LLC ($155.2M). 3 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Cliff Asness (0.0% of AQR Capital Management's portfolio).
- Company
- Marex UK Holdings Ltd.
- Filed as
- MAREX GROUP PLC (Q1 2026)
- CUSIP
- G5S37H101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 38 | $54.1M |
| Exits | 22 | $41.3M |
All 13F filers, Q4 2025 → Q1 2026: 9,271,749 shares bought and 7,301,542 shares sold, net +1,970,207 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 205 holders
| BlackRock, Inc. | 0.00% | Add +10.7% | 4,389,325 | $195.7M |
| Capital International Investors | 0.04% | No change | 3,488,093 | $155.5M |
| FMR LLC | 0.01% | Add +160.9% | 3,481,911 | $155.2M |
| Loomis Sayles & Co. L P | 0.12% | Reduce -0.9% | 1,918,622 | $85.5M |
| T. Rowe Price Associates Inc. | 0.01% | Add +23.1% | 1,906,029 | $85.0M |
| Samlyn Capital, LLC | 1.29% | Add +47.9% | 1,688,877 | $75.3M |
| Two Sigma Investments, LP | 0.06% | Add +86.2% | 1,681,560 | $75.0M |
| Jennison Associates LLC | 0.05% | Add +8.9% | 1,606,691 | $71.6M |
| William Blair Investment Management, LLC | 0.23% | Reduce -9.9% | 1,566,181 | $69.8M |
| Alliancebernstein L.P. | 0.02% | Reduce -1.1% | 1,730,125 | $66.4M |
| Invesco Ltd. | 0.01% | Add +6.0% | 1,372,768 | $61.2M |
| Grandeur Peak Global Advisors, LLC | 13.84% | Reduce -25.5% | 1,325,195 | $59.1M |
| Victory Capital Management Inc. | 0.04% | Add +96.2% | 1,314,816 | $58.6M |
| Royce & Associates LP | 0.55% | Reduce -0.6% | 1,252,790 | $55.8M |
| Ophir Asset Management Pty Ltd | 6.47% | Add +14.7% | 1,246,546 | $55.6M |
| Granahan Investment Management, LLC | 2.64% | Reduce -11.1% | 1,223,750 | $54.6M |
| Artisan Partners Limited Partnership | 0.09% | Add +34.5% | 1,216,883 | $54.2M |
| Ameriprise Financial Inc. | 0.01% | Add +11.0% | 954,242 | $42.5M |
| Allspring Global Investments Holdings, LLC | 0.07% | Add +11.5% | 908,596 | $39.1M |
| State Street Corp. | 0.00% | Add +4.0% | 873,461 | $38.9M |
| Healthcare of Ontario Pension Plan Trust Fund | 0.05% | Reduce -34.6% | 729,000 | $32.5M |
| Geode Capital Management, LLC | 0.00% | Add +2.4% | 726,494 | $32.4M |
| Wellington Management Group LLP | 0.01% | Reduce -13.7% | 655,460 | $29.2M |
| Qube Research & Technologies Ltd | 0.04% | Reduce -22.4% | 592,606 | $26.4M |
| Westwood Holdings Group Inc. | 0.18% | Reduce -4.7% | 537,856 | $24.0M |
| Praetorian PR LLC | 8.11% | No change | 500,000 | $22.3M |
| Bank of New York Mellon Corp | 0.00% | Add +11.2% | 484,524 | $21.6M |
| Goldman Sachs Group Inc. | 0.00% | Add +97.1% | 482,108 | $21.5M |
| Morgan Stanley | 0.00% | Reduce -13.9% | 477,298 | $21.3M |
| Deltroit Asset Management (UK) LLP | 3.48% | Reduce -5.3% | 449,773 | $20.1M |
| JPMorgan Chase & Co. | 0.00% | Add +105.4% | 459,049 | $20.0M |
| Thornburg Investment Management Inc. | 0.19% | Reduce -62.9% | 408,877 | $18.2M |
| Bank of America Corp. | 0.00% | Add +34.3% | 385,026 | $17.2M |
| Nuveen, LLC | 0.00% | Reduce -0.1% | 380,738 | $17.0M |
| Vanguard Portfolio Management LLC | 0.00% | — | 363,180 | $16.2M |
| Swedbank AB | 0.02% | Add +66.1% | 354,413 | $15.8M |
| Sei Investments Co. | 0.01% | Add +0.8% | 354,325 | $15.8M |
| Balyasny Asset Management L.P. | 0.03% | Reduce -75.2% | 346,690 | $15.5M |
| Russell Investments Group, Ltd. | 0.02% | Add +10.5% | 342,988 | $15.3M |
| Algert Global LLC | 0.22% | Add +6.8% | 333,712 | $14.9M |
| T. Rowe Price Investment Management, Inc. | 0.01% | New | 331,243 | $14.8M |
| Manufacturers Life Insurance Company, The | 0.01% | Reduce -0.5% | 310,805 | $13.9M |
| Glenmede Trust Co. NA | 0.07% | Reduce -6.8% | 304,067 | $13.6M |
| Lord, Abbett & Co. LLC | 0.05% | Add +32.6% | 301,267 | $13.4M |
| Northern Trust Corp. | 0.00% | Add +5.3% | 290,675 | $13.0M |
| New York State Common Retirement Fund | 0.01% | Add +45.8% | 238,073 | $10.6M |
| Voloridge Investment Management, LLC | 0.04% | Reduce -46.9% | 224,513 | $10.0M |
| Hudson Bay Capital Management LP | 0.07% | New | 224,141 | $10.0M |
| Globeflex Capital L P | 1.43% | Reduce -1.6% | 212,125 | $9.5M |
| Creative Planning | 0.01% | Add +32.4% | 208,711 | $9.3M |
| Engle Capital Management, L.P. | 3.05% | Add +5.3% | 200,996 | $9.0M |
| Renaissance Group LLC | 0.36% | Reduce -1.9% | 190,900 | $8.5M |
| SG Americas Securities, LLC | 0.01% | Add +1217.4% | 184,519 | $8.2M |
| Citadel Advisors | 0.01% | Add +92.6% | 173,474 | $7.7M |
| Wasatch Advisors LP | 0.05% | Add +452.1% | 171,109 | $7.6M |
| HRT Financial LP | 0.02% | Add +575.1% | 166,121 | $7.4M |
| Walleye Capital LLC | 0.05% | Add +1369.6% | 159,830 | $7.1M |
| Marex Group Ltd | 0.07% | Add +53.7% | 159,100 | $7.1M |
| State of Wisconsin Investment Board | 0.01% | Reduce -9.1% | 145,047 | $6.5M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -4.3% | 141,210 | $6.3M |
| Moody Aldrich Partners LLC | 1.12% | Reduce -0.9% | 139,793 | $6.2M |
| Principal Financial Group Inc. | 0.00% | Reduce -42.4% | 138,508 | $6.2M |
| UBS Group AG | 0.00% | Add +24.9% | 137,479 | $6.1M |
| Marshall Wace, LLP | 0.01% | Add +9.7% | 125,494 | $5.6M |
| Seven Grand Managers, LLC | 0.37% | Reduce -50.0% | 125,000 | $5.6M |
| Calamos Advisors LLC | 0.03% | Add +32.3% | 110,114 | $4.9M |
| Mackenzie Financial Corp. | 0.01% | Add +96.0% | 105,976 | $4.7M |
| Legal & General Group Plc | 0.00% | Add +5.7% | 105,584 | $4.7M |
| Commonwealth of Pennsylvania Public School Empls Retrmt SYS | 0.02% | New | 96,439 | $4.3M |
| BNP Paribas Financial Markets | 0.00% | Reduce -62.4% | 94,641 | $4.2M |
| Man Group plc | 0.01% | New | 89,236 | $4.0M |
| Moody National Bank Trust Division | 0.37% | Reduce -11.8% | 86,630 | $3.9M |
| Raymond James Financial Inc. | 0.00% | Add +19.9% | 86,225 | $3.8M |
| Militia Capital Management LLC | 0.85% | — | 85,531 | $3.8M |
| Federated Hermes, Inc. | 0.01% | Add +13.8% | 84,904 | $3.8M |
| Renaissance Technologies | 0.01% | Reduce -63.5% | 80,520 | $3.6M |
| Intrinsic Edge Capital Management LLC | 0.65% | New | 80,000 | $3.6M |
| Envestnet Asset Management Inc. | 0.00% | Add +97.8% | 76,287 | $3.4M |
| Massar Capital Management, LP | 0.66% | New | 73,696 | $3.3M |
| Rhumbline Advisers | 0.00% | Add +0.4% | 65,487 | $2.9M |
| Epacria Capital Partners, LLC | 2.26% | Add +293.8% | 65,400 | $2.9M |
| Boston Partners | 0.00% | Add +29.9% | 65,110 | $2.9M |
| Squarepoint Ops LLC | 0.01% | Add +566.5% | 64,101 | $2.9M |
| Teachers Retirement System of the State of Kentucky | 0.02% | Reduce -11.6% | 64,089 | $2.9M |
| Franklin Resources Inc. | 0.00% | Reduce -3.3% | 58,421 | $2.6M |
| Los Angeles Capital Management LLC | 0.01% | Add +176.9% | 58,366 | $2.6M |
| Mariner, LLC | 0.00% | Reduce -6.4% | 58,198 | $2.6M |
| Trexquant Investment LP | 0.02% | Reduce -47.6% | 51,395 | $2.3M |
| Quantinno Capital Management LP | 0.00% | Add +293.4% | 49,346 | $2.2M |
| Adage Capital Partners Gp, L.L.C. | 0.00% | Reduce -96.3% | 48,107 | $2.1M |
| Deutsche Bank AG | 0.00% | Reduce -90.3% | 47,910 | $2.1M |
| Public Employees Retirement System of Ohio | 0.01% | Add +12.5% | 42,970 | $1.9M |
| Credit Agricole S A | 0.01% | New | 42,000 | $1.9M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 39,512 | $1.8M |
| Janus Henderson Group PLC | 0.00% | New | 39,441 | $1.8M |
| Aquatic Capital Management LLC | 0.05% | New | 36,518 | $1.6M |
| AQR Capital Management | 0.00% | Add +22.3% | 30,850 | $1.4M |
| MetLife Investment Management, LLC | 0.01% | Add +0.6% | 30,513 | $1.4M |
| Jump Financial, LLC | 0.02% | Add +297.7% | 29,885 | $1.3M |
| Neo Ivy Capital Management | 0.35% | Add +768.6% | 29,863 | $1.3M |
"% of holder's portfolio" is MRX's weight in each manager's 13F, not the share of Marex UK Holdings Ltd. the manager owns.