TransMedics Group Inc (TMDX)
Who owns TransMedics Group Inc (TMDX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.7% of the shares are freely tradable; institutional investors hold 108.9%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 15.32 | 5,293,331 | -1.9 | 03/31/2026 |
| FMR Inc | 14.75 | 5,096,243 | +0.4 | 03/31/2026 |
| Vanguard Group Inc | 10.43 | 3,605,279 | +0.0 | 12/31/2025 |
| Vanguard Portfolio Management, LLC | 5.55 | 1,919,535 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.28 | 1,478,152 | +0.0 | 03/31/2026 |
| State Street Corp | 3.82 | 1,319,479 | +3.5 | 03/31/2026 |
| Amvescap Plc. | 3.00 | 1,037,974 | +51.6 | 03/31/2026 |
| UBS Asset Mgmt Americas Inc | 2.72 | 939,523 | -5.8 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 6.00 | 2,073,206 | +0.0 | 05/29/2026 |
| Vanguard Total Stock Mkt Idx Inv | 3.01 | 1,040,038 | +0.3 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 10. Jul 2026 | Corcoran Nicholas | See remarks | Other | 11,727 | 0.00 | – |
| 10. Jul 2026 | Hernandez Gerardo | Chief Financial Officer | Other | 17,246 | 0.00 | – |
| 10. Jul 2026 | Hassanein Waleed H | President & CEO | Other | 49,669 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.