MarketAxess Holdings
MKTX
531 hedge funds and large institutions have $8.24B invested in MarketAxess Holdings in 2025 Q2 according to their latest regulatory filings, with 85 funds opening new positions, 229 increasing their positions, 161 reducing their positions, and 58 closing their positions.
637% more call options, than puts
Call options by funds: $65.9M | Put options by funds: $8.94M
47% more first-time investments, than exits
New positions opened: 85 | Existing positions closed: 58
42% more repeat investments, than reductions
Existing positions increased: 229 | Existing positions reduced: 161
4% more funds holding
Funds holding: 510 → 531 (+21)
2% more capital invested
Capital invested by funds: $8.05B → $8.24B (+$188M)
0.32% less ownership
Funds ownership: 98.76% → 98.44% (-0.32%)
25% less funds holding in top 10
Funds holding in top 10: 4 → 3 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AQR Capital Management
Greenwich,
Connecticut
|
+$138M |
| 2 |
American Century Companies
Kansas City,
Missouri
|
+$58.2M |
| 3 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$35.4M |
| 4 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
+$34.4M |
| 5 |
Fidelity Investments
Boston,
Massachusetts
|
+$31.3M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
WA
Wasatch Advisors
Salt Lake City,
Utah
|
-$143M |
| 2 |
Macquarie Group
Sydney, NSW 2000,
Australia
|
-$134M |
| 3 |
Marshall Wace
London,
United Kingdom
|
-$77.5M |
| 4 |
Millennium Management
New York
|
-$41M |
| 5 |
VanEck Associates
New York
|
-$38.8M |
MKTX Hedge Fund Activity: Q2 2025 in Review
531 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in MarketAxess Holdings (MKTX) for Q2 2025, worth a combined $8.24B — up 2.3% from $8.05B a quarter earlier.
Buyers outnumbered sellers: 85 funds opened new MKTX positions and 58 closed out — a net gain of 27 holders — while 229 added to existing stakes and 161 trimmed.
The largest buyer was AQR Capital Management, adding an estimated $138M. The largest seller was Wasatch Advisors, cutting an estimated $143M.
- 531 institutional investors held MarketAxess Holdings (MKTX) as of Q2 2025, up from 510 in Q1 2025.
- Funds reported $8.24B of MarketAxess Holdings stock for Q2 2025, up 2.3% quarter-over-quarter.
- 85 funds opened new MarketAxess Holdings positions in Q2 2025 and 58 closed out, a net change of +27 holders.
- The largest MarketAxess Holdings buyer in Q2 2025 was AQR Capital Management, an estimated $138M added.
- The largest MarketAxess Holdings seller in Q2 2025 was Wasatch Advisors, an estimated $143M sold.
Based on aggregated 13F filings for Q2 2025.