TransMedics Group, Inc.
TMDX- Exchange
- Nasdaq
- Industry
- Electromedical & Electrotherapeutic Apparatus
- SEC CIK
- 0001756262
In the last 90 days, TransMedics Group, Inc. insiders filed 1 open-market purchase and 0 sales; 375 institutions reported holding it in 13F filings for Q2 2026, worth $2.31B in total; no superinvestor holds it.
Holders of 5% or more of TMDX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of TransMedics Group, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| FMR LLC | 13G/A | 15.00%5.06M shares | +2.10 ppfrom 12.90% | Dec 6, 20242 filings | May 12, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 14.60%4.96M shares | – | Jul 18, 20251 filing | Jul 18, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
4 Schedule 13D and 13G filings on TransMedics Group, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 27, 20261:34 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Jul 18, 202511:46 AM ET | BlackRock, Inc. | 13G/A | 14.60%4.96M shares | – | Jun 30, 2025 | SEC |
| May 12, 202510:43 AM ET | FMR LLCand 1 other | 13G/A | 15.00%5.06M shares | +2.10 ppfrom 12.90% | Mar 31, 2025 | SEC |
| Dec 6, 202411:38 AM ET | FMR LLCand 1 other | 13G/A | 12.90%4.36M shares | – | Nov 29, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell TransMedics Group, Inc. shares.
No Form 144 notices for TransMedics Group, Inc. are on file.