Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in TMDX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 5.3M | $526.2M | -1.9% | 15.316% | 0.01% |
| 2 | FMR LLC | 5.1M | $506.6M | +0.4% | 14.746% | 0.03% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.9M | $190.8M | β | 5.554% | 0.01% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $146.9M | β | 4.277% | 0.00% |
| 5 | STATE STREET CORP | 1.3M | $131.2M | +3.5% | 3.818% | 0.00% |
| 6 | Invesco Ltd. | 1.0M | $103.2M | +51.6% | 3.003% | 0.02% |
| 7 | UBS ASSET MANAGEMENT AMERICAS INC | 940K | $93.4M | -5.8% | 2.719% | 0.02% |
| 8 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 886K | $88.1M | +6.4% | 2.563% | 0.15% |
| 9 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 867K | $86.2M | β | 2.509% | 0.01% |
| 10 | GOLDMAN SACHS GROUP INC | 866K | $86.1M | -10.3% | 2.506% | 0.01% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 839K | $83.4M | +2.8% | 2.428% | 0.01% |
| 12 | Hood River Capital Management LLC | 700K | $69.6M | +1.4% | 2.025% | 0.70% |
| 13 | MORGAN STANLEY | 694K | $69.0M | +4.0% | 2.008% | 0.00% |
| 14 | UBS Group AG | 582K | $57.8M | -11.8% | 1.683% | 0.01% |
| 15 | EVENTIDE ASSET MANAGEMENT, LLC | 549K | $54.5M | +0.1% | 1.588% | 0.90% |
| 16 | DIMENSIONAL FUND ADVISORS LP | 517K | $51.4M | +5.5% | 1.495% | 0.01% |
| 17 | WELLINGTON MANAGEMENT GROUP LLP | 486K | $48.4M | +12.3% | 1.408% | 0.01% |
| 18 | Capital World Investors | 374K | $37.2M | +64.5% | 1.083% | 0.01% |
| 19 | CITIGROUP INC | 357K | $35.5M | +396.1% | 1.034% | 0.02% |
| 20 | WASATCH ADVISORS INC | 346K | $34.4M | +4.3% | 1.002% | 0.23% |
| 21 | EMERALD ADVISERS, LLC | 343K | $34.1M | -2.4% | 0.992% | 1.08% |
| 22 | NORTHERN TRUST CORP | 338K | $33.6M | -0.3% | 0.978% | 0.00% |
| 23 | BRAIDWELL LP | 329K | $32.7M | +4.5% | 0.953% | 1.09% |
| 24 | TWO SIGMA INVESTMENTS, LP | 325K | $32.3M | -25.4% | 0.941% | 0.03% |
| 25 | FRONTIER CAPITAL MANAGEMENT CO LLC | 320K | $31.9M | +5.9% | 0.927% | 0.33% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in TMDX β a direct measure of their conviction.
Filings activity in TMDX during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new TMDX position in Q1 2026
Institutions that fully closed their TMDX position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 409 | 2.2% | 141.74% | 30.47 pp | $3.57B | 18% |
| Q4 2025 | 418 | +12% | 172.21% | +5.55 pp | $4.34B | +3.3% |
| Q3 2025 | 372 | +4.5% | 166.66% | 26.50 pp | $4.20B | 14% |
| Q2 2025 | 356 | +23% | 193.16% | +91.68 pp | $4.87B | +90% |
| Q1 2025 | 290 | 4.0% | 101.48% | +12.74 pp | $2.56B | +14% |
| Q4 2024 | 302 | 16% | 88.74% | 111.25 pp | $2.24B | 58% |
| Q3 2024 | 359 | +11% | 199.99% | +10.35 pp | $5.34B | +12% |
| Q2 2024 | 322 | β | 189.64% | β | $4.78B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying TMDX stock.
Based on Q1 2026 13F filings, institutional ownership of TransMedics Group, Inc. stands at 141.7%, held across 409 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of TMDX, with approximately 5,293,331 shares worth $0.53B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of TMDX, including SUSQUEHANNA INTERNATIONAL GROUP, LLP, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for TMDX is 40 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
74 institutions opened new positions in TMDX during Q1 2026, while 83 fully exited. 72 added to existing positions and 263 trimmed.
TMDX institutional ownership fell by 30.47 percentage points quarter-over-quarter, with a net change of -9 holders.
The top 10 institutions account for 54.8% of all reported 13F value in TMDX, and the top 25 account for 74.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
TransMedics Group, Inc. (TMDX) Institutional Ownership