13F Insight
DOSSIER · 13F Holders · Q1 2026Financial Services · Security Brokers, Dealers & Flotation Companies
MKTX

MARKETAXESS HLDGS INC

468 institutions still hold MARKETAXESS HLDGS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 57060D108·Security Brokers, Dealers & Flotation Companies·468 13F holders·last filed Mar 31, 2026
Market cap
—
13F value held
$4.6B
visible holders
Holders
468
filers reporting
Concentration
14.64%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

468 institutions reported MKTX in Q1 2026. BlackRock, Inc. leads at 14.6% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$672M4.1M0.01%Q1 202602
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
$552M3.3M0.43%Q1 202603
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$443M2.7M0.20%Q1 202604
Vanguard Portfolio Management
CIK 0002100121· Index
$357M2.2M0.02%Q1 202605
North Reef Capital Management LP
CIK 0001867831
$309M1.9M10.65%Q1 202606
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$265M1.6M0.01%Q1 202607
FMR LLC
CIK 0000315066
$251M1.5M0.01%Q1 202608
STATE STREET CORP
CIK 0000093751
$211M1.3M0.01%Q1 202609
VAN ECK ASSOCIATES CORP
CIK 0000869178
$204M1.2M0.15%Q1 202610
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$199M1.2M0.08%Q1 202611
BANK OF MONTREAL /CAN/
CIK 0000927971
$168M1.0M0.06%Q1 202612
Neuberger Berman Group LLC
CIK 0001465109
$159M966K0.12%Q1 202613
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$142M863K0.01%Q1 202614
CITADEL ADVISORS LLC
CIK 0001423053
$126M696K0.02%Q4 202515
GUARDCAP ASSET MANAGEMENT Ltd
CIK 0001732008
$106M643K6.09%Q1 202616
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$96M581K0.02%Q1 202617
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$86M524K0.07%Q1 202618
GOLDMAN SACHS GROUP INC
CIK 0000886982
$84M509K0.01%Q1 202619
MORGAN STANLEY
CIK 0000895421
$81M491K0.00%Q1 202620
Findlay Park Partners LLP
CIK 0001351950
$79M481K1.11%Q1 2026
Page 1 of 24
448 more holders available. Log in →
Insiders at MARKETAXESS HLDGS INC
Pintoff Scott →Concannon Christopher R →Panchal Naineshkumar Shantilal →Mirwani Nitin A →Hernandez Carlos Mauricio →Berry Dean →Mcpherson Kevin M →Casper Stephen P →