MRX Marex Group plc

NASDAQ
$72.99

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 reporting
255
filed a 13F this quarter
Managers holding
218
+17 on the quarter
Buyers
143
54 opened new
Sellers
90
37 sold out entirely
Buyer share
61.4%
of managers who traded it
Breadth
+22.8
net buyers, as a share of those trading

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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

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.