Who owns MarketAxess Holdings Inc.?
Institutional ownership of MKTX from SEC Form 13F filings across 254 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
254
13F holders
$3.12B
value, 2026 filers
79%
of shares outstanding (27.8M sh)
29
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of MKTX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.0M | $453.9M | 0.0% | 11.4% | -1.8% |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | 3.5M | $397.8M | 0.2% | 10% | +4.7% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.1M | $238.4M | 0.0% | 6% | -2.9% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $175.5M | 0.0% | 4.4% | -51.9% |
| 5 | FMR LLC | 1.4M | $159.5M | 0.0% | 4% | -7.5% |
| 6 | NEUBERGER BERMAN GROUP LLC | 1.2M | $139.6M | 0.1% | 3.5% | +27.3% |
| 7 | GOLDMAN SACHS GROUP INC | 1.0M | $117.0M | 0.0% | 2.9% | +102.6% |
| 8 | BANK OF MONTREAL /CAN/ | 1.0M | $115.4M | 0.0% | 2.9% | -0.3% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 994,772 | $112.9M | 0.0% | 2.8% | +15.3% |
| 10 | VAN ECK ASSOCIATES CORP | 924,617 | $104.9M | 0.1% | 2.6% | -25.4% |
| 11 | NORGES BANKNEW | 572,422 | $65.0M | 0.0% | 1.6% | new |
| 12 | TWO SIGMA INVESTMENTS, LP | 543,890 | $61.7M | 0.0% | 1.5% | +3.8% |
| 13 | CITADEL ADVISORS LLC | 481,689 | $54.7M | 0.0% | 1.4% | +486.3% |
| 14 | JPMORGAN CHASE & CO | 438,001 | $48.3M | 0.0% | 1.2% | +1.2% |
| 15 | MORGAN STANLEY | 422,864 | $48.0M | 0.0% | 1.2% | -13.8% |
| 16 | LOS ANGELES CAPITAL MANAGEMENT LLC | 392,065 | $44.5M | 0.2% | 1.1% | +3992.1% |
| 17 | Sixth Street Partners Management Company, L.P.NEW | 330,815 | $37.5M | 6.5% | 0.9% | new |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 330,815 | $37.5M | 0.0% | 0.9% | -2.3% |
| 19 | Public Sector Pension Investment Board | 314,676 | $35.7M | 0.1% | 0.9% | +63.7% |
| 20 | BANK OF AMERICA CORP /DE/ | 303,517 | $34.4M | 0.0% | 0.9% | +15.0% |
| 21 | UBS Group AG | 278,745 | $31.6M | 0.0% | 0.8% | +2.4% |
| 22 | Bank of New York Mellon Corp | 257,642 | $29.2M | 0.0% | 0.7% | -11.1% |
| 23 | NORTHERN TRUST CORP | 246,521 | $28.0M | 0.0% | 0.7% | +4.3% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 223,656 | $25.4M | 0.0% | 0.6% | -2.5% |
| 25 | HRT FINANCIAL LP | 205,854 | $23,362 | 0.0% | 0.6% | +50.3% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.