TMDX
TransMedics Group, Inc. · Healthcare · Medical - Devices
Momentum inputs (comparable managers):
holder breadth +21.4% ·
share flow +2.5% ·
net new positions +17.6%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 103 | -3 | 25.85M | $1.72B | +11 | −15 |
| Q1 2026 | 110 | -2 | 27.24M | $2.71B | +6 | −9 |
| Q4 2025 | 113 | -2 | 29.10M | $3.52B | +1 | −2 |
| Q3 2025 | 21 | +2 | 20.81M | $2.34B | +2 | −1 |
| Q2 2025 | 17 | +3 | 18.14M | $2.43B | +3 | — |
| Q1 2025 | 11 | -1 | 3.86M | $259.47M | +2 | −3 |
| Q4 2024 | 12 | +2 | 3.62M | $225.65M | +3 | −1 |
| Q3 2024 | 9 | -4 | 2.19M | $344.12M | — | −4 |
| Q2 2024 | 13 | — | 2.46M | $370.15M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 5.22M | — | $700.02M | 0.0% | n/c | 1 | SEC ↗ ×17 |
| 2 | Fidelity (FMR) ✦ | 5.02M | — | $673.23M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 3 | The Vanguard Group ✦ (passive) | 3.60M | — | $481.89M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 4 | State Street Global Advisors ✦ (passive) | 1.29M | -1.3% | $172.74M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 5 | Geode Capital Management ✦ (passive) | 804.65K | +1.4% | $107.84M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 6 | Marshall Wace ✦ | 546.79K | +258.7% | $73.27M | 0.1% | ▲ Add | 2 | SEC ↗ ×4 |
| 7 | Two Sigma Investments ✦ | 411.99K | +1714.5% | $55.21M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 8 | Baillie Gifford ✦ | 262.96K | +1.3% | $35.24M | 0.0% | ▲ Add | 5 | SEC ↗ ×4 |
| 9 | Capital World Investors ✦ | 227.44K | 0.0% | $30.48M | 0.0% | Held | 2 | SEC ↗ |
| 10 | Wellington Management ✦ | 221.07K | -23.9% | $29.63M | 0.0% | ▼ Trim | 5 | SEC ↗ ×4 |
| 11 | Citadel Advisors ✦ | 156.44K | -74.3% | $20.96M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 12 | T. Rowe Price ✦ | 137.89K | +1.6% | $18.48M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 13 | Millennium Management ✦ | 114.91K | New | $15.40M | 0.0% | New | 1 | SEC ↗ |
| 14 | D. E. Shaw & Co. ✦ | 77.04K | +330.2% | $10.32M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 15 | Norges Bank ✦ (passive) | 40.27K | 0.0% | $5.40M | 0.0% | Held | 5 | SEC ↗ |
| 16 | AQR Capital Management ✦ | 4.97K | New | $665,761 | 0.0% | New | 1 | SEC ↗ ×5 |
| 17 | Gotham Asset Management ✦ | 3.16K | New | $423,338 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Millennium Management | $15.40M | 0.0% |
| AQR Capital Management | $665,761 | 0.0% |
| Gotham Asset Management | $423,338 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 412 holders, 36.17M shares, $3.51B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.