Marketaxess Holdings MKTX Institutional Ownership

Updated Oct 11, 2026

Marketaxess Holdings Inc (NASDAQ:MKTX) was reported as a holding by 393 institutional investors in 13F filings for the quarter ended June 30, 2026.

• Total shares held in Marketaxess Holdings rose 2.29% from Q1 2026, while the number of holders fell 25.29% from Q2 2025.
• Of the 393 holders, 188 added to their positions, 164 reduced their stakes and 41 left their positions unchanged in Q2 2026.
• Combined, institutional investors held 39.02Mn shares of MKTX as of Q2 2026, up 873.77K from the prior quarter and up 2.95Mn from a year earlier.
• As of June 30, 2026, the biggest holder of Marketaxess Holdings was BlackRock, Inc. with 4Mn shares.
• Among holders that already owned Marketaxess Holdings, the biggest buyers in Q2 2026 were North Reef Capital Management LP (+1.52Mn shares), Goldman Sachs Group Inc (+522.27K shares), Citadel Advisors LLC (+399.53K shares), Davis Asset Management, L.P. (+391.15K shares) and Los Angeles Capital Management LLC (+382.48K shares).
• The biggest cuts to MKTX positions during Q2 2026 came from Millennium Management LLC (-977.6K shares), AQR Capital Management LLC (-696.46K shares), Van Eck Associates Corp (-314.67K shares), BNP Paribas Financial Markets (-284.01K shares) and Point72 Asset Management, L.P. (-244.72K shares).
• Per Business Quant, the top 10 investors in MKTX for the quarter ended June 30, 2026 were BlackRock, Inc. (4Mn shares), Primecap Management Co (3.5Mn shares), North Reef Capital Management LP (3.4Mn shares), Vanguard Portfolio Management LLC (2.1Mn shares), AQR Capital Management LLC (1.99Mn shares), Vanguard Capital Management LLC (1.55Mn shares), FMR LLC (1.4Mn shares), State Street Corp (1.28Mn shares), Neuberger Berman Group LLC (1.23Mn shares) and Goldman Sachs Group Inc (1.03Mn shares).