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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
AIM
376
Anchor Investment Management
South Carolina
$67.8K -$341 -2 -0.5%
CT
377
Colonial Trust
South Carolina
$63.6K – – –
BC
378
Bayforest Capital
United Kingdom
$61.1K -$280K -1,642 -83%
NICM
379
Neo Ivy Capital Management
New York
$58.2K +$54.8K +321 New
MPWT
380
MassMutual Private Wealth & Trust
Connecticut
$56.4K +$28K +164 +112%
ERSOT
381
Employees Retirement System of Texas
Texas
$56K – – –
Group One Trading
382
Group One Trading
Illinois
$54K -$42.5K -249 -46%
Pacer Advisors
383
Pacer Advisors
Pennsylvania
$50.8K +$35.8K +210 +300%
Federated Hermes
384
Federated Hermes
Pennsylvania
$50.2K -$5.8K -34 -11%
SL
385
Salomon & Ludwin
Virginia
$47K -$3.24K -19 -7%
Simplex Trading
386
Simplex Trading
Illinois
$46.9K -$346K -2,030 -89%
UB
387
UMB Bank
Missouri
$39.1K -$15.7K -92 -30%
RC
388
Rexford Capital
Texas
$38.8K -$68.3K -400 -65%
GAM
389
Generali Asset Management
Italy
$38.8K – – –
DB
390
Danske Bank
Denmark
$36.3K -$608K -3,563 -95%
BTI
391
Blue Trust Inc
Georgia
$32.8K -$29.7K -174 -49%
SIC
392
SJS Investment Consulting
Ohio
$32.1K +$30.2K +177 New
SPIA
393
Steward Partners Investment Advisory
New York
$29.2K -$11.1K -65 -29%
AWM
394
Activest Wealth Management
Florida
$28.3K +$26.6K +156 New
HIA
395
Harbor Investment Advisory
Maryland
$28.1K – – –
RIM
396
Rakuten Investment Management
Japan
$27.6K -$3.45M -20,231 -99%
QC
397
Quent Capital
New York
$27.4K +$17.2K +101 +202%
BSB
398
Bangor Savings Bank
Maine
$25.2K -$1.01M -5,947 -98%
QCG
399
Quadrant Capital Group
Ohio
$23.9K -$147K -860 -87%
BA
400
Bard Associates
Illinois
$22.8K +$21.5K +126 New
14 15
16
17 18

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.