AQR Capital Management, LLC and AQR Capital Management Holdings, LLC filed Amendment No. 2 to Schedule 13G with the SEC on November 12, 2026, disclosing beneficial ownership of 1,231,052 shares of MarketAxess Holdings Inc common stock as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: 1,231,052 shares of MarketAxess Holdings Inc Common Stock, $0.003 par value, representing 3.5% of the class.
  • Shared voting power: Both AQR Capital Management, LLC and AQR Capital Management Holdings, LLC report shared voting power over 1,220,972 shares.
  • Shared dispositive power: Both entities report shared dispositive power over 1,231,052 shares, with zero sole voting or sole dispositive power reported by either entity.
  • Triggering event date: The date of event requiring this filing is September 30, 2026.
  • Relationship between filers: According to the filing, AQR Capital Management, LLC is a wholly owned subsidiary of AQR Capital Management Holdings, LLC.
  • Ownership threshold: The filing was made under Item 5, indicating ownership of 5 percent or less of the class.

AQR Discloses Amended Passive Stake in MarketAxess as of September 30, 2026

AQR Capital Management, LLC, classified as an investment adviser (type "IA"), and its parent AQR Capital Management Holdings, LLC, classified as a holding company (type "HC"), jointly filed Amendment No. 2 to Schedule 13G disclosing their combined position in NASDAQ:MKTX, the common stock of MarketAxess Holdings Inc. Both entities are organized in the United States and are based at One Greenwich Plaza, Suite 130, Greenwich, Connecticut 06830, according to the filing.

As reported in the filing, the aggregate amount beneficially owned by each reporting person is 1,231,052 shares, constituting 3.5% of the outstanding class. Neither entity holds sole voting power or sole dispositive power over any shares. Shared voting power is reported at 1,220,972 shares, while shared dispositive power covers the full 1,231,052 shares. The 10,080-share difference between shared voting power and shared dispositive power is stated in the filing but not explained further.

The filing includes a certification by Henry Parkin, Authorized Signatory for both entities, dated November 12, 2026, stating that "the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." Item 6, covering ownership of more than 5 percent on behalf of another person, is listed as "Not Applicable."

What Was Disclosed

AQR Capital Management, LLC and AQR Capital Management Holdings, LLC disclosed, via Amendment No. 2 to Schedule 13G filed November 12, 2026, that they beneficially own 1,231,052 shares of MarketAxess Holdings Inc common stock, equal to 3.5% of the class, as of September 30, 2026.