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 (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Millennium Management Llc, Citadel Advisors Llc, Fmr Llc, Goldman Sachs Group Inc, and North Reef Capital Management Lp.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Ensign Peak Advisors, IncSell-11,495-69.0%5,167$852.45KQ1 2026Aug 18, 2026
Algert Global LlcSell-39,870-67.2%19,440$3.21MQ1 2026Aug 11, 2026
Brighton Jones LlcBuy+13,098—13,098$2.16MQ1 2026Aug 07, 2026
Wells Fargo & Company/MnSell-368-6.9%4,927$812.79KQ1 2026Jul 08, 2026
Alamar Capital Management, LlcSell-15,612-100.0%0$0.00Q1 2026May 20, 2026
AmundiBuy+230,087+803.9%258,708$42.68MQ1 2026May 18, 2026
Bank Of America CorpBuy+64,627+32.4%263,858$43.53MQ1 2026May 18, 2026
California State Teachers Retirement SystemBuy+8,478+24.1%43,688$7.21MQ1 2026May 18, 2026
Bull Harbor Capital LlcBuy+6,378—6,378$1.05MQ1 2026May 18, 2026
Newedge Advisors, LlcSell-454-18.0%2,072$5.13KQ1 2026May 18, 2026
Guardian Partners Inc.Sell-99-6.6%1,401$231.68KQ1 2026May 18, 2026
Sunbelt Securities, Inc.Buy+17+94.4%35$5.77KQ1 2026May 18, 2026
Parvin Asset Management, LlcSell-4-0.1%5,770$951.93KQ1 2026May 18, 2026
Millennium Management LlcBuy+785,523+260.4%1,087,188$179.36MQ1 2026May 15, 2026
Citadel Advisors LlcSell-543,049-86.9%82,159$13.55MQ1 2026May 15, 2026
Fmr LlcSell-485,204-24.2%1,519,421$250.67MQ1 2026May 15, 2026
Goldman Sachs Group IncBuy+336,445+194.9%509,043$83.98MQ1 2026May 15, 2026
North Reef Capital Management LpBuy+265,670+16.5%1,875,000$309.34MQ1 2026May 15, 2026
Point72 Asset Management, L.P.Buy+252,825—252,825$41.71MQ1 2026May 15, 2026
Driehaus Capital Management LlcBuy+239,256—239,256$39.47MQ1 2026May 15, 2026
Holocene Advisors, LpSell-171,056-79.6%43,799$7.23MQ1 2026May 15, 2026
Sone Capital Management, LlcBuy+149,611+1444.8%159,966$26.39MQ1 2026May 15, 2026
Aqr Capital Management LlcBuy+125,648+4.9%2,683,745$442.76MQ1 2026May 15, 2026
Victory Capital Management IncBuy+111,262+118.8%204,932$33.81MQ1 2026May 15, 2026
Davis Asset Management, L.P.Buy+108,846—108,846$17.96MQ1 2026May 15, 2026
Polar Asset Management Partners Inc.Buy+87,474+523.8%104,174$17.19MQ1 2026May 15, 2026
Morgan StanleyBuy+65,660+15.5%490,537$80.93MQ1 2026May 15, 2026
T. Rowe Price Investment Management, Inc.Sell-60,388-57.7%44,278$7.30MQ1 2026May 15, 2026
Schonfeld Strategic Advisors LlcSell-57,639-57.5%42,596$7.03MQ1 2026May 15, 2026
Squarepoint Ops LlcSell-55,800-77.9%15,858$2.62MQ1 2026May 15, 2026
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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.