MKTX SCHEDULE 13G/A: SEC filing

AQR Capital Management LLC

Filed with the SEC on Nov 12, 2026 · accession 0001167557-26-000245

MKTX filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 12, 2026. A report the company filed with the SEC (the US market regulator). The stock moved -0.1% by the first close after the filing.

Summary of the filing

AQR Capital Management LLC filed an amended Schedule 13G/A disclosing a passive ownership stake of 1,231,052 shares, or 3.5%, of MarketAxess Holdings Inc. as of September 30, 2026.

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Key details

shares beneficially owned$1.2M

percent of class owned$4

Filer / beneficial ownerAQR Capital Management, LLC

Parent holding company / beneficial ownerAQR Capital Management Holdings, LLC

IssuerMarketAxess Holdings Inc.

Authorized signatoryHenry Parkin

How MKTX stock reacted

Close before

$165.31

Nov 11, 2026

First close after

-0.09%

$165.16

5 trading days

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Since filing

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Frequently asked questions

What did MKTX file with the SEC on Nov 12, 2026?

MKTX filed a SCHEDULE 13G/A (SEC filing). AQR Capital Management LLC filed an amended Schedule 13G/A disclosing a passive ownership stake of 1,231,052 shares, or 3.5%, of MarketAxess Holdings Inc. as of September 30, 2026.

How do I read a SCHEDULE 13G/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).

How did MKTX stock react to this filing?

MKTX closed at $165.31 before the filing and $165.16 on Nov 12, 2026 (-0.09%).

Other MKTX SEC filings

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