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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
Bank Julius Baer & Co
401
Bank Julius Baer & Co
Switzerland
$22.6K – – –
S
402
SignatureFD
Georgia
$21K -$34K -199 -63%
CFO
403
CVA Family Office
Colorado
$20.5K +$1.2K +7 +7%
VSQM
404
V-Square Quantitative Management
Illinois
$20.1K +$18.9K +111 New
HPC
405
HM Payson & Co
Maine
$19.9K – – –
NIG
406
NFJ Investment Group
Texas
$19.2K -$1.36K -8 -7%
SAM
407
Smartleaf Asset Management
Massachusetts
$18.3K -$341 -2 -2%
OL
408
OneFund LLC
Florida
$17.9K – – –
Nomura Asset Management
409
Nomura Asset Management
Japan
$17.8K – – –
PTC
410
Private Trust Company
Ohio
$17.4K -$853 -5 -5%
CT
411
Clearstead Trust
Maine
$17.2K +$9.39K +55 +138%
CB
412
CNB Bank
Pennsylvania
$16.7K – – –
GA
413
GoalVest Advisory
New York
$16.3K +$15.4K +90 New
Rockefeller Capital Management
414
Rockefeller Capital Management
New York
$16.1K -$9.04K -53 -38%
BCM
415
Boreal Capital Management
Florida
$12.7K – – –
LSA
416
Leonteq Securities AG
Switzerland
$12.1K +$1.02K +6 +10%
WTC
417
WhitTier Trust Company
Nevada
$11.6K – – –
MCM
418
MAI Capital Management
Ohio
$11.4K +$10.4K +61 +3,050%
RBC
419
Roble Belko & Company
Pennsylvania
$10K – – –
Mitsubishi UFJ Asset Management
420
Mitsubishi UFJ Asset Management
Japan
$10K – – –
IAIM
421
International Assets Investment Management
Florida
$9.24K +$8.7K +51 New
SS
422
SBI Securities
Japan
$9.06K +$512 +3 +6%
PA
423
Parallel Advisors
California
$8.52K -$54.8K -321 -87%
HNB
424
Huntington National Bank
Ohio
$7.98K -$23K -135 -75%
SAG
425
SageView Advisory Group
California
$7.98K +$7.51K +44 New
15 16
17
18 19

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.