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MKTX Institutional Ownership

Top institutional (13F) holders of MKTX and activist (13D/G) positions, sourced from SEC EDGAR.

Institutional owners
42
Institutional value
$3.07B
Top holder
BlackRock, Inc.

Top holders

HolderFiledValue
BlackRock, Inc.holding companyAug 7, 2026$453.94M
PRIMECAP MANAGEMENT CO/CA/hedge fundAug 14, 2026$397.77M
Vanguard Portfolio Managementhedge fundAug 13, 2026$238.36M
AQR CAPITAL MANAGEMENT LLCinvestment advisorAug 14, 2026$222.76M
Vanguard Capital Managementhedge fundAug 13, 2026$175.53M
FMR LLCinvestment advisorAug 13, 2026$159.45M
STATE STREET CORPinvestment advisorAug 7, 2026$145.43M
Neuberger Berman Group LLCinvestment advisorAug 13, 2026$139.58M
MILLENNIUM MANAGEMENT LLCinvestment advisorAug 14, 2026$131.23M
CITIGROUP INCinvestment advisorAug 3, 2026$120.78M
GOLDMAN SACHS GROUP INCinvestment advisorAug 14, 2026$117.04M
GEODE CAPITAL MANAGEMENT, LLCinvestment advisorAug 12, 2026$112.92M
Dimensional Fund Advisors LPhedge fundAug 11, 2026$67.85M
Norges BankotherAug 12, 2026$64.96M
CITADEL ADVISORS LLCinvestment advisorAug 14, 2026$62.25M
TWO SIGMA INVESTMENTS, LPinvestment advisorAug 14, 2026$61.73M
JPMORGAN CHASE & COinvestment advisorAug 12, 2026$48.33M
MORGAN STANLEYinvestment advisorAug 13, 2026$47.99M
CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisorAug 14, 2026$37.54M
BANK OF AMERICA CORP /DE/investment advisorAug 14, 2026$34.45M
UBS Group AGinvestment advisorAug 13, 2026$31.63M
Bank of New York Mellon Corpholding companyAug 6, 2026$29.24M
NORTHERN TRUST CORPinvestment advisorAug 13, 2026$27.98M
RENAISSANCE TECHNOLOGIES LLCinvestment advisorAug 13, 2026$22.70M
SUSQUEHANNA INTERNATIONAL GROUP, LLPinvestment advisorAug 14, 2026$21.88M

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Source: SEC EDGAR Schedule 13D / 13G and 13F filings.