MRX Marex Group plc
Marex Group plc (MRX) Institutional Ownership
What the institutions did with MRX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| FMR LLC | 5.4M | 9.4% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 4.9M | 8.7% |
| BlackRock, Inc. | 4.6M | 8.1% |
| Capital International Investors | 3.3M | 5.7% |
| ALLIANCEBERNSTEIN L.P. | 2.6M | 4.6% |
| WASATCH ADVISORS LP | 1.7M | 3.0% |
| LOOMIS SAYLES & CO L P | 1.6M | 2.9% |
| SAMLYN CAPITAL, LLC | 1.5M | 2.6% |
| Invesco Ltd. | 1.4M | 2.5% |
| Ophir Asset Management Pty Ltd | 1.4M | 2.4% |
| TWO SIGMA INVESTMENTS, LP | 1.3M | 2.3% |
| VICTORY CAPITAL MANAGEMENT INC | 1.3M | 2.3% |
| Granahan Investment Management, LLC | 1.3M | 2.2% |
| MORGAN STANLEY | 1.2M | 2.1% |
| ROYCE & ASSOCIATES LP | 1.1M | 2.0% |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.0M | 1.8% |
| STATE STREET CORP | 1.0M | 1.8% |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.0M | 1.8% |
| AMERIPRISE FINANCIAL INC | 904.2K | 1.6% |
| GEODE CAPITAL MANAGEMENT, LLC | 897.3K | 1.6% |
| WELLINGTON MANAGEMENT GROUP LLP | 775.0K | 1.4% |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 688.7K | 1.2% |
| JENNISON ASSOCIATES LLC | 604.4K | 1.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 569.9K | 1.0% |
| GOLDMAN SACHS GROUP INC | 551.8K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 1.9M | 4.9M | +3.0M |
| FMR LLC | Increased | 3.5M | 5.4M | +1.9M |
| WASATCH ADVISORS LP | Increased | 171.1K | 1.7M | +1.5M |
| Grandeur Peak Global Advisors, LLC | Sold Out | 1.3M | 0 | -1.3M |
| Artisan Partners Limited Partnership | Sold Out | 1.2M | 0 | -1.2M |
| JENNISON ASSOCIATES LLC | Reduced | 1.6M | 604.4K | -1.0M |
| Allspring Global Investments Holdings, LLC | Sold Out | 908.6K | 0 | -908.6K |
| ALLIANCEBERNSTEIN L.P. | Increased | 1.7M | 2.6M | +870.3K |
| MORGAN STANLEY | Increased | 477.3K | 1.2M | +692.4K |
| WESTFIELD CAPITAL MANAGEMENT CO LP | New | 0 | 688.7K | +688.7K |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Reduced | 1.6M | 1.0M | -557.0K |
| WESTWOOD HOLDINGS GROUP INC | Reduced | 537.9K | 5.7K | -532.2K |
| FRANKLIN RESOURCES INC | Increased | 58.4K | 538.1K | +479.7K |
| Deltroit Asset Management (UK) LLP | Sold Out | 449.8K | 0 | -449.8K |
| FEDERATED HERMES, INC. | Increased | 84.9K | 464.9K | +380.0K |
| TUDOR INVESTMENT CORP ET AL | New | 0 | 372.9K | +372.9K |
| SEI INVESTMENTS CO | Sold Out | 354.3K | 0 | -354.3K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 1.7M | 1.3M | -346.1K |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Increased | 729.0K | 1.0M | +314.3K |
| LOOMIS SAYLES & CO L P | Reduced | 1.9M | 1.6M | -291.9K |
| Balyasny Asset Management L.P. | Reduced | 346.7K | 68.8K | -277.9K |
| MML INVESTORS SERVICES, LLC | New | 0 | 262.6K | +262.6K |
| Walleye Capital LLC | Increased | 159.8K | 408.0K | +248.2K |
| Militia Capital Management LLC | Reduced | 256.6K | 20.0K | -236.6K |
| NEW YORK STATE COMMON RETIREMENT FUND | Increased | 238.1K | 469.5K | +231.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.