TMDX TransMedics Group, Inc.: institutional ownership and insider trading
415 funds reported holding $3.04B of TransMedics Group, Inc. in their latest 13F filings; in Q2 2026 funds net bought $42.0M, with 64 new positions and 103 funds selling out; over the last 12 months insiders bought $1.11M and sold $4.87M on the open market.
Famous investors holding TMDX
- Ken Griffin (Citadel Advisors): $94.1M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $17.5M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $594K, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $332K, 0.0% of the portfolio
Largest institutional holders of TMDX
- VANGUARD GROUP INC — $439M
- BlackRock, Inc. (BLK) — $372M
- FMR LLC — $341M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $128M
- VANGUARD CAPITAL MANAGEMENT LLC — $99.5M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP — $95.8M
- STATE STREET CORP (STT, STT-PG) — $94.3M
- CITADEL ADVISORS LLC — $94.1M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC. — $60.5M
- GEODE CAPITAL MANAGEMENT, LLC — $59.5M
Recent TMDX insider trades
- Sep 11, 2026: Weill David bought 1,336 shares ($109K)
- Jun 15, 2026: Gunderson Thomas J. sold 9,624 shares ($722K)
- Mar 4, 2026: Weill David sold 3,571 shares ($524K)
- Mar 4, 2026: Lovell Stephanie sold 1,193 shares ($178K)
5%+ owners
- Vanguard Portfolio Management: 5.7% (Schedule 13G, filed Apr 29, 2026)
- Vanguard Capital Management: 5.1% (Schedule 13G, filed Apr 30, 2026)