TransMedics Group Inc
Ownership
Ownership Structure
Who owns TransMedics Group Inc (TMDX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.8% of the shares are freely tradable; institutional investors hold 108.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 15.27 | 5,293,331 | -1.9 | 03/31/2026 |
| FMR Inc | 14.70 | 5,096,243 | +0.4 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.54 | 1,919,535 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.26 | 1,478,152 | +0.0 | 03/31/2026 |
| State Street Corp | 3.81 | 1,319,479 | +3.5 | 03/31/2026 |
| Amvescap Plc. | 2.99 | 1,037,974 | +51.6 | 03/31/2026 |
| UBS Asset Mgmt Americas Inc | 2.71 | 939,523 | -5.8 | 03/31/2026 |
| Delaware Management Holdings Inc | 2.55 | 885,841 | +6.4 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 6.08 | 2,106,551 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.01 | 1,042,917 | +0.4 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Hassanein Waleed H | President & CEO | 171,093 | 14,833,763 $ | Jul 10, 2026 | direct |
| Corcoran Nicholas | See remarks | 41,558 | 3,603,079 $ | Jul 10, 2026 | direct |
| Hernandez Gerardo | Chief Financial Officer | 31,935 | 2,768,765 $ | Jul 10, 2026 | direct |
| Weill David | Director | 16,392 | 1,421,186 $ | Sep 11, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 11, 2026 | Weill David | Director | Buy | 1,336 | 81.63 | 109,058 |
| Aug 17, 2026 | Tobin James R | Director | Other | 18,000 | 0.00 | – |
| Jul 10, 2026 | Corcoran Nicholas | See remarks | Other | 11,727 | 0.00 | – |
| Jul 10, 2026 | Hernandez Gerardo | Chief Financial Officer | Other | 17,246 | 0.00 | – |
| Jul 10, 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: September 17, 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.