Ticker · CUSIP 57060D108

MKTX

MARKETAXESS HLDGS INC
Financial Services·Capital Markets
···Share
Holders (tracked)
17
Combined shares
4,971,613
Combined value
$894.95M
Last close
$173.50
Quarter
2025Q4
Tracked holders · last 8 quarters
+5 vs previous quarter over the last 8.
17162024Q12025Q4
Price is -3.6% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

25 events
  1. Pintoff Scott · General Counsel and Secretary
    2026-04-10
    Sold $17.2K @ $171.96
    Insider sell
  2. T. Rowe Price added2026-02-17
    +2,381 shares · 2025Q4
    13F
  3. Ken Griffin (Citadel Advisors) added2026-02-17
    +315,122 shares · 2025Q4
    13F
  4. D.E. Shaw & Co. trimmed2026-02-17
    −149,519 shares · 2025Q4
    13F
  5. AQR Capital Management added2026-02-17
    +1,607,009 shares · 2025Q4
    13F
  6. Two Sigma Investments added2026-02-17
    +169,143 shares · 2025Q4
    13F
  7. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +23,589 shares · 2025Q4
    13F
  8. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −305,891 shares · 2025Q4
    13F
  9. Steve Cohen (Point72) exited2026-02-17
    −163,900 shares · 2025Q4
    13F
  10. Ray Dalio (Bridgewater Associates) opened position2026-02-13
    +13,261 shares · 2025Q4
    13F
  11. Renaissance Technologies trimmed2026-02-12
    −69,000 shares · 2025Q4
    13F
  12. Norges Bank (Norway SWF) opened position2026-02-10
    +503,855 shares · 2025Q4
    13F
  13. First Eagle Investment Management opened position2026-02-04
    +22 shares · 2025Q4
    13F
  14. Baillie Gifford & Co trimmed2026-01-23
    −125,083 shares · 2025Q4
    13F
  15. Paul Tudor Jones (Tudor Investment) exited2025-12-09
    −93,154 shares · 2025Q3
    13F
  16. AQR Capital Management added2025-11-14
    +192,626 shares · 2025Q3
    13F
  17. Izzy Englander (Millennium Mgmt) added2025-11-14
    +175,374 shares · 2025Q3
    13F
  18. Steve Cohen (Point72) added2025-11-14
    +108,432 shares · 2025Q3
    13F
  19. Two Sigma Investments added2025-11-14
    +84,295 shares · 2025Q3
    13F
  20. D.E. Shaw & Co. added2025-11-14
    +16,720 shares · 2025Q3
    13F
  21. T. Rowe Price trimmed2025-11-14
    −27,884 shares · 2025Q3
    13F
  22. Renaissance Technologies added2025-11-13
    +54,400 shares · 2025Q3
    13F
  23. Norges Bank (Norway SWF) exited2025-11-13
    −513,089 shares · 2025Q3
    13F
  24. Norges Bank (Norway SWF) added2025-11-12
    +11,159 shares · 2024Q3
    13F
  25. Baillie Gifford & Co trimmed2025-10-31
    −22,491 shares · 2025Q3
    13F

Insider activity

Last 30 days
Net (open-market)
−$17.2K
Buys
0 · $0
Sells
1 · $17.2K
Unique insiders
1
DateInsiderCodeSharesPriceValue
04-10Pintoff Scott
General Counsel and Secretary · Insider
S100$171.96$17.2K
View full insider history for MKTX →
Follow-the-investor returns
If you'd copied each holder of MKTX…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2016Q1$88.26+96.6%$5.9M
Ken Griffin (Citadel Advisors)2016Q2$180.85-4.1%$5.8M
Ken Griffin (Citadel Advisors)2016Q2$180.85-4.1%$5.8M
Ken Griffin (Citadel Advisors)2016Q2$180.85-4.1%$5.8M
First Eagle Investment Management2025Q4$181.27-4.3%$4K
AQR Capital Management2016Q1$192.19-9.7%$443.8M
Izzy Englander (Millennium Mgmt)2016Q1$197.16-12.0%$8.9M
Izzy Englander (Millennium Mgmt)2016Q1$197.16-12.0%$8.9M
Two Sigma Investments2020Q3$197.73-12.3%$92.6M
Renaissance Technologies2016Q1$204.02-15.0%$30.5M
Baillie Gifford & Co2016Q1$210.47-17.6%$6.8M
Ray Dalio (Bridgewater Associates)2019Q4$216.10-19.7%$2.3M
D.E. Shaw & Co.2016Q1$216.77-20.0%$6.3M
Paul Tudor Jones (Tudor Investment)2016Q2$223.19-22.3%$399K
Paul Tudor Jones (Tudor Investment)2016Q2$223.19-22.3%$399K
Paul Tudor Jones (Tudor Investment)2016Q2$223.19-22.3%$399K
Norges Bank (Norway SWF)2016Q1$10481.20-98.3%$87.4M

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions4
Added to4
Trimmed4
Exited1

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
20
$122.48B
2022Q2
22
$94.71B
2022Q3
21
$84.6M
2022Q4
19
$1.67B
2023Q1
19
$2.49B
2023Q2
17
$1.76B
2023Q3
19
$1.28B
2023Q4
13
$1.42B
2024Q1
16
$1.02B
2024Q2
15
$971.9M
2024Q3
14
$504.9M
2024Q4
12
$405.5M
2025Q1
12
$468.8M
2025Q2
15
$689.7M
2025Q3
12
$664.0M
2025Q4
17
$895.0M
Congress members trading this stock
DateMemberTypeAmount rangeFiling
2025-02-12Julie JohnsonSell$1K – $15KPDF ↗
2025-01-15Julie JohnsonBuy$1K – $15KPDF ↗

Who owns MKTX

17 super-investors · 2025Q4
Tracked stake
4.97M
shares
Combined value
$895M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New6Added6Trim5
#ManagerSharesValue
1AQR Capital Management2.56M$464M
2Ken Griffin
Citadel Advisors
625.2K$113M
3Two Sigma Investments533.5K$97M
4Norges Bank
Norway SWF
503.9K$91M
5Izzy Englander
Millennium Mgmt
301.7K$55M
6Renaissance Technologies176.0K$32M
7Izzy Englander
Millennium Mgmt
51.2K$9M
8Baillie Gifford & Co39.1K$7M
9Ken Griffin
Citadel Advisors
37.1K$7M
10D.E. Shaw & Co.36.1K$7M
11Ken Griffin
Citadel Advisors
33.2K$6M
12Paul Tudor Jones
Tudor Investment
23.6K$4M
13Ray Dalio
Bridgewater Associates
13.3K$2M
14Paul Tudor Jones
Tudor Investment
3.4K$616K
15Paul Tudor Jones
Tudor Investment
2.3K$417K
16T. Rowe Price34.0K$6K
17First Eagle Investment Management22$4K

Recent moves

20 transactions
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