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Who owns MarketAxess Holdings (MKTX) stock

392 funds reported MarketAxess Holdings (MKTX) shares in their latest 13F filings, worth $5.1B in all. The largest holder is Vanguard Group ($696M). Last quarter 172 funds added to their stakes and 240 cut them. Members of Congress and other officials disclosed 1 trade (0 buys, 1 sales).

Largest holders of MKTX (13F)Largest holders of MKTX (13F)Vanguard Group$696MBlackRock$454MPrimecap Management$398MNorth Reef Capital Management LP$385MVanguard Portfolio Management LLC$238MAQR Capital Management LLC$223MVanguard Capital Management LLC$176MFMR LLC$159MState Street$145MNeuberger Berman Group LLC$140M

Largest holders (13F)

FundSharesValueChangeQuarter
Vanguard Group3,839,889$696Mdecrease2025-12-31
BlackRock3,999,836$454Mdecrease2026-06-30
Primecap Management3,504,905$398Mincrease2026-06-30
North Reef Capital Management LP3,395,000$385Mincrease2026-06-30
Vanguard Portfolio Management LLC2,100,273$238Mdecrease2026-06-30
AQR Capital Management LLC1,987,288$223Mdecrease2026-06-30
Vanguard Capital Management LLC1,546,670$176Mdecrease2026-06-30
FMR LLC1,404,998$159Mdecrease2026-06-30
State Street1,281,769$145Mincrease2026-06-30
Neuberger Berman Group LLC1,229,929$140Mincrease2026-06-30
Burgundy Asset Management692,216$127Mincrease2025-09-30
Goldman Sachs Group1,031,309$117Mincrease2026-06-30
Bank of Montreal1,017,024$115Mdecrease2026-06-30
Geode Capital Management, LLC994,772$113Mincrease2026-06-30
Van ECK Associates924,617$105Mdecrease2026-06-30

Trades by Congress and other officials

DateWhoTradeAmount
2026-04-09Josh Gottheimersale$1K–$15K

MarketAxess Holdings' latest quarter

MarketAxess Holdings, Q3 2026: revenue $210M (+0.8% year over year), operating margin 35.4%, net earnings $54.0M, operating cash flow $247M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most MKTX stock?

By the latest 13F filings: Vanguard Group ($696M); BlackRock ($454M); Primecap Management ($398M); North Reef Capital Management LP ($385M); Vanguard Portfolio Management LLC ($238M).

Has Congress traded MKTX stock?

Officials disclosed 1 trade on file: 0 buys and 1 sales. The latest: Josh Gottheimer, sale on 2026-04-09.

What is the short interest in MKTX?

3,433,862 shares were sold short at the 2026-10-15 settlement, 7.13% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.