MAREX GROUP PLC (MRX) Institutional Shareholders
MAREX GROUP PLC (MRX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $2.99B in MRX holdings during the latest filing period.
Fmr Llc is currently the largest disclosed institutional shareholder of MRX tracked by InsiderSet, reporting ownership valued at approximately $327.21M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $381.48M, representing an estimated gain of +16.59% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed MRX value among the investors covered in this analysis. Major shareholders include Fmr Llc, Blackrock, Inc., Capital International Investors, and several other long-term asset managers with concentrated positions in MAREX GROUP PLC (MRX).
This page ranks the largest institutional MRX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
211
Total Reported Value
$2.99B
Largest Holder
Fmr Llc
Largest Position
$327.21M
Insider Transactions (90d)
31
Latest Filing Quarter
Q2 2026
New Institutional Positions
86
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Fmr Llc | 0.01% | 5,368,485 | $327,209,161 | $381,484,544 | +$54,275,383 | +16.59% | |
| Blackrock, Inc. | 0.00% | 4,594,149 | $280,013,375 | $326,460,228 | +$46,446,853 | +16.59% | |
| Capital International Investors | 0.04% | 3,264,364 | $198,962,986 | $231,965,706 | +$33,002,720 | +16.59% | |
| Alliancebernstein L.P. | 0.04% | 2,600,436 | $115,927,437 | $184,786,982 | +$68,859,545 | +59.40% | |
| Wasatch Advisors Lp | 0.67% | 1,683,061 | $102,582,568 | $119,598,315 | +$17,015,747 | +16.59% | |
| Loomis Sayles & Co L P | 0.12% | 1,626,702 | $99,147,471 | $115,593,444 | +$16,445,973 | +16.59% | |
| Samlyn Capital, Llc | 1.50% | 1,483,250 | $90,404,088 | $105,399,745 | +$14,995,657 | +16.59% | |
| Invesco Ltd. | 0.01% | 1,404,552 | $85,607,444 | $99,807,465 | +$14,200,021 | +16.59% | |
| Ophir Asset Management Pty Ltd | 6.98% | 1,391,511 | $84,812,595 | $98,880,772 | +$14,068,177 | +16.59% | |
| Two Sigma Investments, Lp | 0.06% | 1,335,436 | $81,394,824 | $94,896,082 | +$13,501,258 | +16.59% | |
| Victory Capital Management Inc | 0.04% | 1,291,337 | $78,706,990 | $91,762,407 | +$13,055,417 | +16.59% | |
| Granahan Investment Management, Llc | 2.72% | 1,254,283 | $76,448,549 | $89,129,350 | +$12,680,801 | +16.59% | |
| Morgan Stanley | 0.00% | 1,169,722 | $71,294,566 | $83,120,445 | +$11,825,879 | +16.59% | |
| Royce & Associates Lp | 0.55% | 1,111,339 | $67,678,044 | $78,971,749 | +$11,293,705 | +16.69% | |
| State Street Corp | 0.00% | 1,026,731 | $62,579,254 | $72,959,505 | +$10,380,251 | +16.59% | |
| William Blair Investment Management, Llc | 0.18% | 1,009,199 | $61,510,679 | $71,713,681 | +$10,203,002 | +16.59% | |
| Healthcare Of Ontario Pension Plan Trust Fund | 0.09% | 1,043,286 | $61,491,277 | $74,135,903 | +$12,644,626 | +20.56% | |
| Ameriprise Financial Inc | 0.01% | 904,162 | $55,108,675 | $64,249,752 | +$9,141,077 | +16.59% | |
| Geode Capital Management, Llc | 0.00% | 897,253 | $52,884,092 | $63,758,798 | +$10,874,706 | +20.56% | |
| Wellington Management Group Llp | 0.01% | 775,023 | $47,237,652 | $55,073,134 | +$7,835,482 | +16.59% | |
| Westfield Capital Management Co Lp | 0.14% | 688,665 | $41,974,132 | $48,936,535 | +$6,962,403 | +16.59% | |
| Jennison Associates Llc | 0.02% | 604,393 | $36,837,754 | $42,948,167 | +$6,110,413 | +16.59% | |
| Vanguard Portfolio Management Llc | 0.00% | 569,895 | $34,735,100 | $40,496,739 | +$5,761,639 | +16.59% | |
| Goldman Sachs Group Inc | 0.00% | 551,753 | $33,629,345 | $39,207,568 | +$5,578,223 | +16.59% | |
| Praetorian Pr Llc | 9.71% | 500,000 | $30,475,000 | $35,530,000 | +$5,055,000 | +16.59% | |
| New York State Common Retirement Fund | 0.04% | 469,510 | $28,616,635 | $33,363,381 | +$4,746,746 | +16.59% | |
| Federated Hermes, Inc. | 0.04% | 464,935 | $28,337,789 | $33,038,281 | +$4,700,492 | +16.59% | |
| Qube Research & Technologies Ltd | 0.03% | 449,433 | $27,392,941 | $31,936,709 | +$4,543,768 | +16.59% | |
| Norges Bank | 0.00% | 429,800 | $26,196,310 | $30,541,588 | +$4,345,278 | +16.59% | |
| Nuveen, Llc | 0.01% | 419,120 | $25,545,309 | $29,782,667 | +$4,237,358 | +16.59% | |
| Algert Global Llc | 0.30% | 411,697 | $25,092,932 | $29,255,189 | +$4,162,257 | +16.59% | |
| Walleye Capital Llc | 0.12% | 408,016 | $24,868,575 | $28,993,617 | +$4,125,042 | +16.59% | |
| Tudor Investment Corp Et Al | 0.09% | 372,910 | $22,728,865 | $26,498,985 | +$3,770,120 | +16.59% | |
| Bank Of New York Mellon Corp | 0.00% | 367,225 | $22,382,375 | $26,095,009 | +$3,712,634 | +16.59% | |
| Northern Trust Corp | 0.00% | 354,764 | $21,622,865 | $25,209,530 | +$3,586,665 | +16.59% | |
| Swedbank Ab | 0.02% | 354,440 | $21,603,118 | $25,186,506 | +$3,583,388 | +16.59% | |
| Russell Investments Group, Ltd. | 0.02% | 347,067 | $21,153,811 | $24,662,581 | +$3,508,770 | +16.59% | |
| Glenmede Trust Co Na | 0.08% | 295,517 | $18,011,760 | $20,999,438 | +$2,987,678 | +16.59% | |
| Bank Of America Corp | 0.00% | 291,285 | $17,753,820 | $20,698,712 | +$2,944,892 | +16.59% | |
| Manufacturers Life Insurance Company, The | 0.01% | 289,033 | $17,616,561 | $20,538,685 | +$2,922,124 | +16.59% | |
| Thornburg Investment Management Inc | 0.16% | 275,027 | $16,762,896 | $19,543,419 | +$2,780,523 | +16.59% | |
| Intrinsic Edge Capital Management Llc | 2.05% | 272,776 | $16,625,697 | $19,383,463 | +$2,757,766 | +16.59% | |
| Mml Investors Services, Llc | 0.03% | 262,551 | $16,002,459 | $18,656,874 | +$2,654,415 | +16.59% | |
| Alyeska Investment Group, L.P. | 0.04% | 244,695 | $14,914,160 | $17,388,027 | +$2,473,867 | +16.59% | |
| Bnp Paribas Financial Markets | 0.01% | 241,071 | $14,693,277 | $17,130,505 | +$2,437,228 | +16.59% | |
| Jpmorgan Chase & Co | 0.00% | 242,209 | $14,275,798 | $17,211,372 | +$2,935,574 | +20.56% | |
| Hudson Bay Capital Management Lp | 0.07% | 228,742 | $13,941,825 | $16,254,407 | +$2,312,582 | +16.59% | |
| Timessquare Capital Management, Llc | 0.19% | 211,722 | $12,904,456 | $15,044,965 | +$2,140,509 | +16.59% | |
| Renaissance Technologies LLC | Jim Simons | 0.02% | 180,087 | $10,976,303 | $12,796,982 | +$1,820,679 | +16.59% |
| Charles Schwab Investment Management Inc | 0.00% | 171,846 | $10,474,014 | $12,211,377 | +$1,737,363 | +16.59% |
Frequently asked questions about MRX
Who owns the most MRX stock?
The largest holders of MRX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MAREX GROUP PLC (MRX).
Is MRX widely held by superinvestors?
Many widely followed stocks like MRX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MRX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.