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MarketAxess Holdings
MKTX

485 hedge funds and large institutions have $6.62B invested in MarketAxess Holdings in 2025 Q4 according to their latest regulatory filings, with 117 funds opening new positions, 156 increasing their positions, 170 reducing their positions, and 70 closing their positions.

New
Increased
Maintained
Reduced
Closed

67% more first-time investments, than exits

New positions opened: 117 | Existing positions closed: 70

65% more call options, than puts

Call options by funds: $33.7M | Put options by funds: $20.4M

50% more funds holding in top 10

Funds holding in top 10: 2 → 3 (+1)

8% more funds holding

Funds holding: 450 → 485 (+35)

7% more capital invested

Capital invested by funds: $6.21B → $6.62B (+$404M)

2.96% more ownership

Funds ownership: 95.28% → 98.24% (+3%)

8% less repeat investments, than reductions

Existing positions increased: 156 | Existing positions reduced: 170

Holders
485
Holders Change
+35
Holders Change %
+7.78%
% of All Funds
5.9%
Holding in Top 10
3
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+50%
% of All Funds
0.04%
New
117
Increased
156
Reduced
170
Closed
70
Calls
$33.7M
Puts
$20.4M
Net Calls
+$13.3M
Net Calls Change
-$156M

Top Buyers

1
BlackRock
BlackRock
New York
+$324M
2
AQR Capital Management
AQR Capital Management
Connecticut
+$274M
3
Primecap Management
Primecap Management
California
+$161M
4
Bank of Montreal
Bank of Montreal
Ontario, Canada
+$159M
5
NRCM
North Reef Capital Management
California
+$119M

Top Sellers

1
HSBC Holdings
HSBC Holdings
United Kingdom
-$306M
2
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
-$214M
3
VanEck Associates
VanEck Associates
New York
-$125M
4
Millennium Management
Millennium Management
New York
-$52.2M
5
GAM
GuardCap Asset Management
United Kingdom
-$35.4M
Name Holding Trade Value Shares
Change 		Change in
Stake
Capital Fund Management (CFM)
501
Capital Fund Management (CFM)
France
– -$2.15M -12,367 Closed
LCM
502
LRT Capital Management
Texas
– -$2.12M -12,170 Closed
HT
503
Headlands Technologies
Illinois
– -$2.11M -12,127 Closed
CHP
504
Castle Hook Partners
New York
– -$1.96M -11,235 Closed
VF
505
Virtu Financial
New York
– -$1.88M -10,799 Closed
M
506
MATAURO
New York
– -$1.45M -8,312 Closed
HI
507
Horizon Investments
North Carolina
– -$1.43M -8,205 Closed
ECA
508
Elevate Capital Advisors
Colorado
– -$1.27M -7,315 Closed
SW
509
SVB Wealth
Massachusetts
– -$1.21M -6,928 Closed
IFU
510
iSAM Funds (UK)
United Kingdom
– -$997K -5,720 Closed
PCM
511
Polymer Capital Management
New York
– -$977K -5,607 Closed
CNAM
512
Campbell Newman Asset Management
Wisconsin
– -$618K -3,548 Closed
FC
513
Farringdon Capital
United Kingdom
– -$558K -3,204 Closed
BJL
514
Brighton Jones LLC
Washington
– -$525K -3,012 Closed
AIP
515
Arrowpoint Investment Partners
Singapore
– -$438K -2,515 Closed
EC
516
EntryPoint Capital
New York
– -$432K -2,480 Closed
1C
517
111 Capital
France
– -$408K -2,343 Closed
Walleye Trading
518
Walleye Trading
New York
– -$379K -2,220 Closed
RS
519
R Squared
Hong Kong
– -$382K -2,194 Closed
GIA
520
Gateway Investment Advisers
Ohio
– -$354K -2,034 Closed
IPW
521
Impact Partnership Wealth
Georgia
– -$351K -2,012 Closed
NPF
522
Norris Perne & French
Michigan
– -$337K -1,935 Closed
MAS
523
Meeder Advisory Services
Ohio
– -$327K -1,874 Closed
William Blair & Company
524
William Blair & Company
Illinois
– -$294K -1,687 Closed
CCFM
525
Clear Creek Financial Management
Washington
– -$243K -1,394 Closed
19 20
21
22 23

MKTX Hedge Fund Activity: Q4 2025 in Review

485 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in MarketAxess Holdings (MKTX) for Q4 2025, worth a combined $6.62B — up 6.5% from $6.21B a quarter earlier.

Buyers outnumbered sellers: 117 funds opened new MKTX positions and 70 closed out — a net gain of 47 holders — while 156 added to existing stakes and 170 trimmed.

The largest buyer was BlackRock, adding an estimated $324M. The largest seller was HSBC Holdings, cutting an estimated $306M.

  • 485 institutional investors held MarketAxess Holdings (MKTX) as of Q4 2025, up from 450 in Q3 2025.
  • Funds reported $6.62B of MarketAxess Holdings stock for Q4 2025, up 6.5% quarter-over-quarter.
  • 117 funds opened new MarketAxess Holdings positions in Q4 2025 and 70 closed out, a net change of +47 holders.
  • The largest MarketAxess Holdings buyer in Q4 2025 was BlackRock, an estimated $324M added.
  • The largest MarketAxess Holdings seller in Q4 2025 was HSBC Holdings, an estimated $306M sold.

Based on aggregated 13F filings for Q4 2025.