MarketAxess Holdings Inc. (MKTX) Ownership & Trading Activity
Institutional holders, insider transactions, and congressional trades for MKTX. 13F holdings as of 2026-06-30.
In 13F filings for the quarter ended June 30, 2026, 379 institutions reported holding MKTX, with 39.0 million shares worth $4.4 billion in aggregate.
Top Institutional Holders
| Institution | Shares | Value | Change |
|---|---|---|---|
| BlackRock | 3,999,836 | $454M | DECREASED |
| Vanguard | 3,930,844 | $446M | DECREASED |
| Primecap Management Co | 3,504,905 | $398M | INCREASED |
| North Reef Capital Management | 3,395,000 | $385M | INCREASED |
| AQR Capital Management | 1,987,288 | $223M | DECREASED |
Full institutional holdings, insider history, and congressional trades for MarketAxess Holdings Inc. on SentiSense.