MKTX Institutional Ownership
Who owns Marketaxess Holdings Inc and what the big funds did with it last quarter, from every SEC 13F filing. 397 funds reported holding MKTX at Jun 30, 2026, together owning 111.3% of the company.
- ▼183 buying vs 275 selling
- ▲Held by funds +2.6 pts
- ▼Funds holding -55
- ▲Superinvestors: 3 added, 2 cut
- ▼Put/call 0.01 to 0.02
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 397 | 452 | −12.2% |
| In funds' top 10 | 2 | 2 | 0.0% |
| 13F shares | 39.2M | 38.2M | +2.4% |
| Held by funds | 111.3% | 108.7% | +2.6 pts |
| New positions | 54 | 54 | 0.0% |
| Increased | 129 | 181 | −28.7% |
| Reduced | 170 | 149 | +14.1% |
| Sold out | 105 | 91 | +15.4% |
| Calls (shares) | 1.1M | 123K | +780.2% |
| Puts (shares) | 28K | 6,600 | +324.2% |
| Put/call ratio | 0.02 | 0.01 | +91.6% |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in MKTX
All superinvestors →
Who owns MKTX
share of fund held shares- Index and passive funds32.1%
- Active managers and hedge funds51.6%
- Banks and brokers13.0%
- Pensions, insurers and other3.3%
The top 10 holders own 54.9% of all MKTX shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
111 funds changed their position- Cooke & Bieler LPSold out−239K sh
- ProShare Advisors LLCNew+90K sh
- Flossbach Von Storch SESold out−75K sh
- Abc Arbitrage SANew+46K sh
- Y-Intercept (Hong Kong) LtdSold out−55K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 11.37% | 4M | $454M | −75K |
| 2 | Primecap Management Co/ca/ | 9.96% | 3.5M | $398M | +158K |
| 3 | North Reef Capital Management LP | 9.65% | 3.4M | $385M | +1.5M |
| 4 | Vanguard Portfolio Management LLC | 5.97% | 2.1M | $238M | −63K |
| 5 | AQR Capital Management LLC | 5.65% | 2M | $223M | −696K |
| 6 | Vanguard Capital Management LLC | 4.39% | 1.5M | $176M | −63K |
| 7 | Fmr LLC | 3.99% | 1.4M | $159M | −114K |
| 8 | State Street Corp | 3.64% | 1.3M | $145M | +912 |
| 9 | Neuberger Berman Group LLC | 3.49% | 1.2M | $140M | +264K |
| 10 | Goldman Sachs Group Inc | 2.93% | 1M | $117M | +522K |
- North Reef Capital Management LP+1.5M sh+$173M
- Norges Bank+572K sh+$65M
- Goldman Sachs Group Inc+522K sh+$59.3M
- Azora Capital LP+513K sh+$58.2M
- Citadel Advisors LLC+400K sh+$45.3M
- Davis Asset Management, L.P.+391K sh+$44.4M
- Los Angeles Capital Management LLC+382K sh+$43.4M
- Neuberger Berman Group LLC+264K sh+$30M
- Millennium Management LLC−978K sh−$111M
- Findlay Park Partners LLP−481K sh−$79.3M
- AQR Capital Management LLC−696K sh−$78.1M
- Driehaus Capital Management LLC−239K sh−$39.5M
- Van Eck Associates Corp−315K sh−$35.7M
- Bnp Paribas Financial Markets−284K sh−$32.2M
- Point72 Asset Management, L.P.−245K sh−$27.8M
- Walleye Capital LLC−239K sh−$27.1M
MKTX institutional ownership FAQ
Who owns the most MKTX stock?
In Q2 2026 13F filings the largest holder of MKTX was BlackRock, Inc., followed by Primecap Management Co/ca/ and North Reef Capital Management LP. Index fund managers are usually the biggest holders of large companies.
What percentage of MKTX is owned by institutions?
Funds that file 13F reports held 111.3% of MKTX's shares at Jun 30, 2026, compared with 108.7% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying MKTX?
In Q2 2026, 183 funds bought MKTX (54 of them new positions) and 275 sold (105 sold out completely). Among well known investors, 3 added and 2 cut. Our fund sentiment for MKTX is neutral.
What is MKTX's institutional put/call ratio?
Funds reported $2.7M of MKTX puts against $123M of calls, a put/call ratio of 0.02 (0.01 the quarter before). Market makers and bank trading desks are left out, since their options are mostly hedges.
How current is this MKTX ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.