MRX Marex Group plc

NASDAQ
$73.00

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.

Managers compared
257
filed both this quarter and last
Managers holding
220
+17 on the quarter
Buyers
144
54 opened new
Sellers
91
37 sold out entirely
Buyer share
61.3%
of managers who traded it
Breadth
+22.6
net buyers, as a share of those trading

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.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest 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
Alyeska Investment Group, L.P. Increased 16.9K 244.7K +227.8K
Capital International Investors Reduced 3.5M 3.3M -223.7K
JPMORGAN CHASE & CO Reduced 459.0K 242.2K -216.8K
TimesSquare Capital Management, LLC New 0 211.7K +211.7K
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 363.2K 569.9K +206.7K
SAMLYN CAPITAL, LLC Reduced 1.7M 1.5M -205.6K
BlackRock, Inc. Increased 4.4M 4.6M +204.8K
VOLORIDGE INVESTMENT MANAGEMENT, LLC Reduced 224.5K 30.6K -193.9K
INTRINSIC EDGE CAPITAL MANAGEMENT LLC Increased 80.0K 272.8K +192.8K
CITADEL ADVISORS LLC Sold Out 173.5K 0 -173.5K
GEODE CAPITAL MANAGEMENT, LLC Increased 726.5K 897.3K +170.8K
SG Americas Securities, LLC Reduced 184.5K 15.7K -168.9K
STATE STREET CORP Increased 873.5K 1.0M +153.3K
BNP PARIBAS FINANCIAL MARKETS Increased 94.6K 241.1K +146.4K
Ophir Asset Management Pty Ltd Increased 1.2M 1.4M +145.0K
Qube Research & Technologies Ltd Reduced 592.6K 449.4K -143.2K
ROYCE & ASSOCIATES LP Reduced 1.3M 1.1M -141.5K
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC Increased 15.8K 155.6K +139.8K
THORNBURG INVESTMENT MANAGEMENT INC Reduced 408.9K 275.0K -133.9K
SEVEN GRAND MANAGERS, LLC Sold Out 125.0K 0 -125.0K
RAYMOND JAMES FINANCIAL INC Increased 86.2K 210.3K +124.1K
Engle Capital Management, L.P. Reduced 201.0K 79.0K -122.0K
WELLINGTON MANAGEMENT GROUP LLP Increased 655.5K 775.0K +119.6K
Bank of New York Mellon Corp Reduced 484.5K 367.2K -117.3K
RENAISSANCE GROUP LLC Reduced 190.9K 75.7K -115.2K
RENAISSANCE TECHNOLOGIES LLC Increased 80.5K 180.1K +99.6K
MACKENZIE FINANCIAL CORP Reduced 106.0K 9.3K -96.7K
BANK OF AMERICA CORP /DE/ Reduced 385.0K 291.3K -93.7K
Man Group plc Sold Out 89.2K 0 -89.2K
CITIGROUP INC Increased 4.4K 90.1K +85.7K
ALGERT GLOBAL LLC Increased 333.7K 411.7K +78.0K
ENVESTNET ASSET MANAGEMENT INC Sold Out 76.3K 0 -76.3K
Thrivent Financial for Lutherans New 0 74.6K +74.6K
GOLDMAN SACHS GROUP INC Increased 482.1K 551.8K +69.6K
NORTHERN TRUST CORP Increased 290.7K 354.8K +64.1K

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.