13F Insight
DOSSIER · 13F Holders · Q2 2026Financial Services · Security Brokers, Dealers & Flotation Companies
MKTX

MARKETAXESS HLDGS INC

433 institutions still hold MARKETAXESS HLDGS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 57060D108·Security Brokers, Dealers & Flotation Companies·433 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$3.3B
visible holders
Holders
433
filers reporting
Concentration
13.91%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q2 2026

433 institutions reported MKTX in Q2 2026. BlackRock, Inc. leads at 13.9% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$454M4.0M0.01%Q2 202602
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
$398M3.5M0.24%Q2 202603
North Reef Capital Management LP
CIK 0001867831
$309M1.9M10.65%Q1 202604
Vanguard Portfolio Management
CIK 0002100121· Index
$238M2.1M0.01%Q2 202605
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$223M2.0M0.08%Q2 202606
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$176M1.5M0.00%Q2 202607
FMR LLC
CIK 0000315066
$159M1.4M0.01%Q2 202608
STATE STREET CORP
CIK 0000093751
$145M1.3M0.00%Q2 202609
Neuberger Berman Group LLC
CIK 0001465109
$140M1.2M0.09%Q2 202610
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$131M1.2M0.05%Q2 202611
CITIGROUP INC
CIK 0000831001
$121M1.1M0.04%Q2 202612
GOLDMAN SACHS GROUP INC
CIK 0000886982
$117M1.0M0.01%Q2 202613
BANK OF MONTREAL /CAN/
CIK 0000927971
$115M1.0M0.04%Q2 202614
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$113M995K0.01%Q2 202615
VAN ECK ASSOCIATES CORP
CIK 0000869178
$105M925K0.06%Q2 202616
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$68M598K0.01%Q2 202617
NORGES BANK
CIK 0001374170· Sovereign
$65M572K0.01%Q2 202618
CITADEL ADVISORS LLC
CIK 0001423053
$62M548K0.01%Q2 202619
GUARDCAP ASSET MANAGEMENT Ltd
CIK 0001732008
$62M536K4.42%Q2 202620
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$62M544K0.04%Q2 2026
Page 1 of 22
413 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 →