As of November 6, 2026, TransMedics Group, Inc. is a publicly traded company (Nasdaq: TMDX); its largest reported holder is BlackRock, with 14.6% on Schedule 13G/A of July 18, 2025, then Vanguard (5.68%). The largest insider holding is Waleed H. Hassanein, the chief executive and president, with 666,102 shares (1.9% of shares outstanding), per Form 4 of July 14, 2026 (Schedule 13G/A, July 18, 2025).
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Is TransMedics Group, Inc. a real, registered company?
- TransMedics Group Inc files with the SEC under CIK 1756262 (its SEC filings).
- Its shares are listed under the ticker TMDX on Nasdaq (SEC company record).
- Incorporated in Massachusetts; business address in Andover, Massachusetts, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under TransMedics Group Inc in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Fernando Araujo, Chief Financial Officer (Form 8-K filed 2026-09-10). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Vanguard (filed 2026-04-30).
Who are TransMedics Group, Inc.'s owners and officers?
TransMedics Group, Inc.: incorporated in Massachusetts; business address in Andover, Massachusetts; industry Electromedical & Electrotherapeutic Apparatus (Form D, 2026-09-10).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.06% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 5.68% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G/A, 2025-07-18 | Blackrock, Inc. | 14.6% |
Questions about who owns TransMedics Group, Inc.
Who owns TransMedics Group, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of TransMedics Group, Inc.: Blackrock, Inc. (14.6%, Schedule 13G/A, filed 2025-07-18), Vanguard Portfolio Management (5.68%, Schedule 13G, filed 2026-04-29) and Vanguard Capital Management (5.06%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of TransMedics Group, Inc.?
By the share each holder's latest filing reports, the largest holders of TransMedics Group, Inc. on this page are Blackrock, Inc. (14.6%), Vanguard Portfolio Management (5.68%) and Vanguard Capital Management (5.06%).
When did Blackrock, Inc. buy into TransMedics Group, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2025-07-18, reporting 14.6%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 4 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-09-10 | Fernando Araujo | Chief Financial Officer | appointed | 2026-09-21 |
| Form 8-K, 2026-09-10 | Gerardo Hernandez | appointed |
Which insiders own TransMedics Group, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and president: 666,102 shares (1.9% of shares outstanding), 171,093 held directly and 495,009 indirectly (Form 4, 2026-07-14).
- , a director: 309,874 shares (0.89% of shares outstanding), 263,732 held directly and 46,142 indirectly (Form 4, 2026-05-22).
- , a director: 162,127 shares (0.47% of shares outstanding), 6,981 held directly and 155,146 indirectly (Form 4, 2026-08-17).
- Nicholas Corcoran: 41,558 shares (0.12% of shares outstanding) (Form 4, 2026-07-14).
- , the chief commercial officer: 36,042 shares (0.10% of shares outstanding) (Form 4, 2025-03-05).
Shares outstanding: 34,733,883 as of 2026-11-02, from the company's latest SEC cover page.
How much has TransMedics Group, Inc. raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2025-10-06).
Keep reading
More on TransMedics Group Inc and the records around it.
TransMedics Group Inc elsewhere on the record
- Leadership changes Sep 2026
Companies that share a holder
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
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