TransMedics Group, Inc. (TMDX) ownership: Top institutional holder: BlackRock, Inc. ($526.21M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 5293331.00 | $526.21M | 2026-03-31 |
| FMR LLC | 5096243.00 | $506.62M | 2026-03-31 |
| VANGUARD GROUP INC | 3605279.00 | $438.58M | 2025-12-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1919535.00 | $190.82M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1478152.00 | $146.94M | 2026-03-31 |
| STATE STREET CORP | 1319479.00 | $131.17M | 2026-03-31 |
| Invesco Ltd. | 1037974.00 | $103.18M | 2026-03-31 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 939523.00 | $93.40M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-07-10 | |
| Sell | null | 2026-07-10 | |
| Sell | null | 2026-07-10 | |
| Sell | null | 2026-07-10 | |
| Sell | null | 2026-07-10 | |
| Sell | null | 2026-07-10 | |
| Sell | null | 2026-06-15 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.