MARKETAXESS HOLDINGS INC (MKTX) Institutional Ownership Changes & 13F Activity

MARKETAXESS HOLDINGS INC (MKTX). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC, Sequoia Financial Advisors, First Eagle U.S. Value, Polen Capital Management, and Meritage Group.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCSell-8,900167,100$27,568,158
Q4 2025Renaissance Technologies LLCSell-69,000176,000$31,900,000
Q4 2025Sequoia Financial AdvisorsSell-2701,877$340,211
Q4 2025First Eagle U.S. ValueBuy2222$3,988
Q3 2025Renaissance Technologies LLCBuy54,400245,000$42,691,250
Q3 2025Sequoia Financial AdvisorsBuy8412,147$374,122
Q2 2025Renaissance Technologies LLCBuy61,100190,600$42,568,604
Q2 2025Sequoia Financial AdvisorsBuy1,3061,306$291,699
Q1 2025Renaissance Technologies LLCSell-98,380129,500$28,017,325
Q1 2025Polen Capital ManagementSell-3114,046$875,352
Q4 2024Renaissance Technologies LLCBuy40,270227,880$51,509,995
Q4 2024Polen Capital ManagementSell-4,3124,357$984,856
Q3 2024Renaissance Technologies LLCBuy22,974187,610$48,065,682
Q3 2024Polen Capital ManagementBuy5858,669$2,220,998
Q2 2024Renaissance Technologies LLCBuy159,436164,636$33,014,457
Q2 2024Polen Capital ManagementSell-818,084$1,621,085
Q1 2024Renaissance Technologies LLCSell-115,9105,200$1,140
Q1 2024Polen Capital ManagementBuy3,7048,165$1,790,176
Q4 2023Polen Capital ManagementBuy3,1804,461$67,858,652
Q4 2023Meritage GroupSell-457862$252
Q3 2023Renaissance Technologies LLCBuy60,300121,110$25,874
Q3 2023Meritage GroupBuy3121,319$282
Q2 2023Renaissance Technologies LLCSell-3,16360,810$15,897
Q2 2023Meritage GroupBuy3971,007$263
Q1 2023Renaissance Technologies LLCSell-3,10063,973$25,032
Q1 2023Meritage GroupSell-244610$239
Q4 2022Renaissance Technologies LLCSell-69,51067,073$18,706
Q4 2022Meritage GroupSell-354854$238
Q3 2022Renaissance Technologies LLCBuy77,110136,583$30,388
Q3 2022Parnassus Endeavor FundSell-42,42959,976$13,344

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.

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