MARKETAXESS HOLDINGS INC (MKTX) Stock Institutional Trading Activity


MARKETAXESS HOLDINGS INC (MKTX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Sequoia Financial Advisors, Polen Capital Management, Meritage Group, and Parnassus Endeavor Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Renaissance Technologies LLCSell-69,000176,000$31,900,000
Q3 2025Sequoia Financial AdvisorsBuy8412,147$374,122
Q3 2025Renaissance Technologies LLCBuy54,400245,000$42,691,250
Q2 2025Sequoia Financial AdvisorsBuy1,3061,306$291,699
Q2 2025Renaissance Technologies LLCBuy61,100190,600$42,568,604
Q1 2025Polen Capital ManagementSell-3114,046$875,352
Q1 2025Renaissance Technologies LLCSell-98,380129,500$28,017,325
Q4 2024Polen Capital ManagementSell-4,3124,357$984,856
Q4 2024Renaissance Technologies LLCBuy40,270227,880$51,509,995
Q3 2024Polen Capital ManagementBuy5858,669$2,220,998
Q3 2024Renaissance Technologies LLCBuy22,974187,610$48,065,682
Q2 2024Polen Capital ManagementSell-818,084$1,621,085
Q2 2024Renaissance Technologies LLCBuy159,436164,636$33,014,457
Q1 2024Renaissance Technologies LLCSell-115,9105,200$1,140
Q1 2024Polen Capital ManagementBuy3,7048,165$1,790,176
Q4 2023Meritage GroupSell-457862$252
Q4 2023Polen Capital ManagementBuy3,1804,461$67,858,652
Q3 2023Meritage GroupBuy3121,319$282
Q3 2023Renaissance Technologies LLCBuy60,300121,110$25,874
Q2 2023Meritage GroupBuy3971,007$263
Q2 2023Renaissance Technologies LLCSell-3,16360,810$15,897
Q1 2023Meritage GroupSell-244610$239
Q1 2023Renaissance Technologies LLCSell-3,10063,973$25,032
Q4 2022Meritage GroupSell-354854$238
Q4 2022Renaissance Technologies LLCSell-69,51067,073$18,706
Q3 2022Meritage GroupBuy1,2081,208$269
Q3 2022Parnassus Endeavor FundSell-42,42959,976$13,344
Q3 2022Renaissance Technologies LLCBuy77,110136,583$30,388
Q2 2022Renaissance Technologies LLCBuy33,50059,473$15,226
Q2 2022Parnassus Endeavor FundBuy24,654102,405$26,217

Frequently asked questions about MKTX activity

  • Which institutional owners are buying MKTX?

    Institutional owners buying MKTX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MKTX activity?

    "Buy" means an investor increased their reported position in MKTX compared to the prior reporting period. This reflects growing exposure to MARKETAXESS HOLDINGS INC (MKTX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MKTX increasing?

    Institutional interest in MKTX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.