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TMDX · TransMedics Group, Inc.

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Market Cap
$3.02B
Shares
34.68M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 379
Total Value: $2,508,542,750
Total Shares: 37,767,926
Showing 1–100 of 398 holdings by value · page 1 of 4

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 379 13F filers · Δ vs Mar 31, 2026
Top Holder
14.8%
Sep 2023 → Jun 2026 · range 12.9% – 14.8%
+0.7 pts
Top 5
41.3%
Sep 2023 → Jun 2026 · range 34.0% – 44.9%
+1.1 pts
Top 10
55.6%
Sep 2023 → Jun 2026 · range 48.8% – 57.7%
+3.1 pts
HHI
541
Sep 2023 → Jun 2026 · range 396 – 541
Broadly held+35

Quarterly Activity

vs Mar 31, 2026
New
66
Increased
142
Decreased
127
Sold Out
108
Unchanged
44
Holder count: -42
Institutional value: -32.7%
Shares held: +0.7%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 398
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1756262 CUSIP 89377M109 13F (30d) 253 filings 251 filers Visit website Investor relations