MKTX MARKETAXESS HOLDINGS INC: institutional ownership and insider trading
445 funds reported holding $5.65B of MARKETAXESS HOLDINGS INC in their latest 13F filings; in Q2 2026 funds net bought $360M, with 53 new positions and 106 funds selling out; over the last 12 months insiders bought $0 and sold $1.18M on the open market.
Famous investors holding MKTX
- Izzy Englander (Millennium Management): $131M, 0.1% of the portfolio
- Two Sigma (Two Sigma Investments): $61.7M, 0.0% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $22.7M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $62.2M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $5.68M, 0.0% of the portfolio
- Ray Dalio (Bridgewater Associates): $797K, 0.0% of the portfolio
Largest institutional holders of MKTX
- VANGUARD GROUP INC — $696M
- BlackRock, Inc. (BLK) — $454M
- PRIMECAP MANAGEMENT CO/CA/ — $398M
- North Reef Capital Management LP — $385M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $238M
- AQR CAPITAL MANAGEMENT LLC — $223M
- VANGUARD CAPITAL MANAGEMENT LLC — $176M
- FMR LLC — $159M
- STATE STREET CORP (STT, STT-PG) — $145M
- Neuberger Berman Group LLC — $140M
Recent MKTX insider trades
- Oct 12, 2026: Pintoff Scott sold 100 shares ($16.5K)
- Sep 10, 2026: Cruger William Frank Jr. sold 6,164 shares ($1.01M)
- Sep 10, 2026: Pintoff Scott sold 100 shares ($16.3K)
- Aug 10, 2026: Pintoff Scott sold 100 shares ($16.3K)
Members of Congress trading MKTX
- Apr 9, 2026: Josh Gottheimer sold $1.00K–$15.0K
- Feb 12, 2025: Julie Johnson sold $1.00K–$15.0K
- Jan 15, 2025: Julie Johnson bought $1.00K–$15.0K
5%+ owners
- PRIMECAP MANAGEMENT CO/CA/: 9.9% (Schedule 13G/A, filed Aug 6, 2026)
- North Reef Capital Management LP: 9.6% (Schedule 13G/A, filed Aug 14, 2026)
- Vanguard Portfolio Management: 6.1% (Schedule 13G, filed Apr 29, 2026)
- AQR Capital Management, LLC: 5.6% (Schedule 13G/A, filed Aug 13, 2026)
- Vanguard Capital Management: 5.3% (Schedule 13G, filed Apr 30, 2026)