MarketAxess Holdings
MKTX
447 hedge funds and large institutions have $6.31B invested in MarketAxess Holdings in 2026 Q1 according to their latest regulatory filings, with 61 funds opening new positions, 180 increasing their positions, 151 reducing their positions, and 89 closing their positions.
244% more call options, than puts
Call options by funds: $36M | Put options by funds: $10.5M
19% more repeat investments, than reductions
Existing positions increased: 180 | Existing positions reduced: 151
9.28% more ownership
Funds ownership: 98.24% → 107.51% (+9.3%)
5% less capital invested
Capital invested by funds: $6.62B → $6.31B (-$312M)
8% less funds holding
Funds holding: 485 → 447 (-38)
31% less first-time investments, than exits
New positions opened: 61 | Existing positions closed: 89
33% less funds holding in top 10
Funds holding in top 10: 3 → 2 (-1)
Top Buyers
| 1 |
Millennium Management
New York
|
+$138M |
| 2 |
Neuberger Berman Group
New York
|
+$73M |
| 3 |
Goldman Sachs
New York
|
+$58.9M |
| 4 |
BlackRock
New York
|
+$57.6M |
| 5 |
NRCM
North Reef Capital Management
Laguna Beach,
California
|
+$46.5M |
Top Sellers
| 1 |
Citadel Advisors
Miami,
Florida
|
-$95.1M |
| 2 |
GAM
GuardCap Asset Management
London,
United Kingdom
|
-$89.4M |
| 3 |
Fidelity Investments
Boston,
Massachusetts
|
-$85M |
| 4 |
Holocene Advisors
New York
|
-$30M |
| 5 |
JP Morgan Chase
New York
|
-$19.7M |
MKTX Hedge Fund Activity: Q1 2026 in Review
447 of the 8,125 institutional investors tracked by Wall St. Rank reported a position in MarketAxess Holdings (MKTX) for Q1 2026, worth a combined $6.31B — down 4.7% from $6.62B a quarter earlier.
Sellers outnumbered buyers: 89 funds closed out of MKTX and 61 opened new positions — a net loss of 28 holders — while 151 trimmed existing stakes and 180 added.
The largest buyer was Millennium Management, adding an estimated $138M. The largest seller was Citadel Advisors, cutting an estimated $95.1M.
- 447 institutional investors held MarketAxess Holdings (MKTX) as of Q1 2026, down from 485 in Q4 2025.
- Funds reported $6.31B of MarketAxess Holdings stock for Q1 2026, down 4.7% quarter-over-quarter.
- 61 funds opened new MarketAxess Holdings positions in Q1 2026 and 89 closed out, a net change of -28 holders.
- The largest MarketAxess Holdings buyer in Q1 2026 was Millennium Management, an estimated $138M added.
- The largest MarketAxess Holdings seller in Q1 2026 was Citadel Advisors, an estimated $95.1M sold.
Based on aggregated 13F filings for Q1 2026.