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TransMedics TMDX

US equityMarket cap rank #2517
$82.99 +$3.20 (+4.00%)
Market closed · Oct 6, 4:30 am ET · Last extended-hours $82.50 -0.59%
Open$79.50
Prev close$79.80
Day range$77.37 – $83.40
Volume995.1K
Market cap$2.88B
P/E (TTM)21.5
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership102.6%+0.24 pts vs. prior quarter
Institutions holding444-2 vs. prior quarter
Insider trades (recent)29 buys / 20 sellsNet buying
Short interest23.01% of floatDays to cover 10.7 · as of 15 Sep 2026
Short-sale volume share15.4%5-day average of daily volume

Short-sale volume as % of daily volume

11%13%16%18%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$4.32M (9 inflow days, 11 outflow days).

The five largest holders on file together own 45.6% of shares outstanding.

Largest holders

  • BlackRock16.14%
  • FMR14.80%
  • Vanguard Portfolio Management, LLC5.58%
  • Vanguard Capital Management, LLC5.03%
  • State Street Global Advisors4.10%
  • Macquarie Investment Management Business Trust2.63%
  • Geode Capital Management, LLC2.58%
  • UBS Asset Management2.56%

By investor type

  • Mutual Fund85.81%
  • Hedge Fund7.27%
  • Public Company5.59%
  • Individual/Insider3.19%
  • Private Company2.23%
  • Government Pension Fund1.07%
  • Insurance Company0.35%
  • Family Office/Trust0.18%

Reported short interest has risen from 22.76% to 23.01% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 7,977,125 23.0% 10.7
31 Aug 2026 8,079,087 23.3% 12.8
14 Aug 2026 7,910,244 22.8% 6.7
31 Jul 2026 7,672,830 22.2% 9.5
15 Jul 2026 7,715,332 22.3% 9.5
30 Jun 2026 7,865,697 22.8% 6.0

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