Transmedics Group, Inc.
A medical technology company that makes the Organ Care System, a portable device that keeps donor hearts, lungs, and livers warm, beating, and functioning outside the body during transport—a shift from the old method of packing organs on ice. Founded in 1998 by cardiac surgeon Dr. Waleed Hassanein, the company's name blends "transplant" and "medics." Its machines let transplant teams assess and preserve organs in a near-living state while they travel to recipients.
Sold 875.1K
Sold 500.0K
Granted 1.04M · Bought 25.6K · Sold 556.1K
Granted 2.9K
Granted 4.1K · Bought 133.3K
Granted 7.0K · Sold 236.2K
Granted 339.7K · Sold 381.5K
Granted 47.0K · Sold 16.2K
Granted 262.4K · Sold 264.0K
Granted 43.8K · Sold 18.6K
Granted 22.2K · Sold 9.6K
Granted 15.4K
Granted 43.1K · Bought 12.5K · Sold 40.6K
Granted 23.2K · Sold 8.5K
Granted 102.2K · Sold 89.1K
Granted 41.8K · Sold 37.2K
Granted 22.4K · Sold 9.5K
Granted 11.1K
Granted 7.0K
Granted 39.8K · Bought 8.5K · Sold 56.8K
Granted 17.5K · Sold 11.8K
Granted 16.6K · Sold 10.9K
Granted 4.1K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Abrams David C +6 co-filers10% owner · 3 transactions | — | 6.04Mas of Feb 2021 | — | — | 875.1K |
| Lung Biotechnology PBC +1 co-filer10% owner · 2 transactions | — | 2.05Mas of Dec 2019 | — | — | 500.0K |
| Afeyan Noubar +4 co-filers10% owner · 10 transactions | — | 1.86Mas of Oct 2019 | — | — | — |
| Hassanein Waleed HPresident & CEO, Director · 125 transactions | — | 616.4K | 1.04M | 25.6K | 556.1K |
| Kania EdwinDirector · 1 transaction | — | 309.9K | 2.9K | — | — |
| Kania Edwin M JrDirector · 25 transactions | — | 307.0Kas of May 2025 | 4.1K | 133.3K | — |
| Tobin James RDirector · 30 transactions | — | 180.1K | 7.0K | — | 236.2K |
| Khayal Tamer IChief Commercial Officer · 195 transactions | — | 82.7Kas of Mar 2025 | 339.7K | — | 381.5K |
| Corcoran NicholasSee remarks · 9 transactions | — | 29.8K | 47.0K | — | 16.2K |
| Gordon StephenChief Financial Officer · 70 transactions | — | 23.4Kas of Jun 2024 | 262.4K | — | 264.0K |
| Provost MiriamVP, Global Regulatory Affairs · 24 transactions | — | 23.3Kas of Dec 2023 | 43.8K | — | 18.6K |
| Gunderson Thomas J.Director · 3 transactions | — | 16.6K | 22.2K | — | 9.6K |
| Forsyth Matthew S.See Remarks · 1 transaction | — | 15.4K | 15.4K | — | — |
| Weill DavidDirector · 18 transactions | — | 15.1K | 43.1K | 12.5K | 40.6K |
| Hernandez GerardoChief Financial Officer · 8 transactions | — | 14.7K | 23.2K | — | 8.5K |
| Carey John FVP of Operations · 112 transactions | — | 14.3Kas of Feb 2023 | 102.2K | — | 89.1K |
| Sullivan John FVP of Quality & Engineering · 18 transactions | — | 14.3Kas of Aug 2021 | 41.8K | — | 37.2K |
| Ranganath Anil P.See remarks · 9 transactions | — | 13.1K | 22.4K | — | 9.5K |
| Cecere GiovanniChief Commercial Officer · 1 transaction | — | 8.0K | 11.1K | — | — |
| Raines MerileeDirector · 4 transactions | — | 7.0K | 7.0K | — | — |
| Basile Edward MDirector · 34 transactions | — | 5.8K | 39.8K | 8.5K | 56.8K |
| Lovell StephanieDirector · 11 transactions | — | 5.8K | 17.5K | — | 11.8K |
| Damme LauraVP, Clinical Affairs · 7 transactions | — | 5.7Kas of Feb 2023 | 16.6K | — | 10.9K |
| Gunderson Thomas JamesDirector · 3 transactions | — | 4.1Kas of May 2025 | 4.1K | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -2.94M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.