Who owns TransMedics Group, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of TMDX from SEC Form 13F filings across 375 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 375 institutions disclosed 34.8M shares of TransMedics Group, Inc. worth $2.31B — about 100.7% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
375
13F holders
$2.31B
value, 2026 filers
100.7%
of shares outstanding (34.8M sh)
74
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of TMDX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 5.6M | $371.7M | 0.0% | 16.2% | +5.7% |
| 2 | FMR LLC | 5.1M | $341.0M | 0.0% | 14.8% | +0.7% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.9M | $128.5M | 0.0% | 5.6% | +0.8% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $99.5M | 0.0% | 4.3% | +1.3% |
| 5 | STATE STREET CORP | 1.4M | $94.3M | 0.0% | 4.1% | +7.7% |
| 6 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 910,495 | $60.5M | 0.1% | 2.6% | +2.8% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 894,913 | $59.5M | 0.0% | 2.6% | +6.6% |
| 8 | Hood River Capital Management LLC | 751,133 | $49.9M | 0.4% | 2.2% | +7.3% |
| 9 | DIMENSIONAL FUND ADVISORS LP | 610,107 | $40.5M | 0.0% | 1.8% | +18.1% |
| 10 | BRAIDWELL LP | 609,715 | $40.5M | 1.5% | 1.8% | +85.1% |
| 11 | GOLDMAN SACHS GROUP INC | 559,771 | $37.2M | 0.0% | 1.6% | -35.4% |
| 12 | CITADEL ADVISORS LLC | 558,824 | $37.1M | 0.0% | 1.6% | +807.2% |
| 13 | EVENTIDE ASSET MANAGEMENT, LLC | 548,874 | $36.5M | 0.5% | 1.6% | 0.0% |
| 14 | WELLINGTON MANAGEMENT GROUP LLP | 515,973 | $34.3M | 0.0% | 1.5% | +6.1% |
| 15 | EMERALD ADVISERS, LLC | 490,491 | $32.6M | 0.8% | 1.4% | +43.1% |
| 16 | UBS Group AG | 488,058 | $32.4M | 0.0% | 1.4% | -16.0% |
| 17 | MORGAN STANLEY | 405,112 | $26.9M | 0.0% | 1.2% | -41.6% |
| 18 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 398,250 | $26.5M | 0.0% | 1.2% | -57.6% |
| 19 | Invesco Ltd. | 394,979 | $26.2M | 0.0% | 1.1% | -61.9% |
| 20 | CITIGROUP INC | 386,066 | $25.6M | 0.0% | 1.1% | +8.0% |
| 21 | Capital World Investors | 384,671 | $25.5M | 0.0% | 1.1% | +2.8% |
| 22 | NORTHERN TRUST CORP | 368,860 | $24.5M | 0.0% | 1.1% | +9.1% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 328,666 | $21.8M | 0.0% | 1% | +3.1% |
| 24 | WASATCH ADVISORS LP | 308,434 | $20.5M | 0.1% | 0.9% | -10.9% |
| 25 | ZEVENBERGEN CAPITAL INVESTMENTS LLCNEW | 308,391 | $20.5M | 0.5% | 0.9% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.