Latest Period
Q1 2026
Security Snapshot
TransMedics Group, Inc. - Common Stock (TMDX) Institutional Ownership
CUSIP: 89377M109
13F Institutional Holders and Ownership History from Q1 2019 to Q1 2026
Institutions Reporting
413
Shares (Excl. Options)
36,436,809
Price
$99.41
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- Security type / class
- Equity / Common Stock
- Symbol
- TMDX on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 36,436,809
- Total 13F value
- $3,622,229,168
- Portfolio coverage rank
- 0.01%
- Share change
- -756,924
- Value change
- -$96,771,717
- Number of holders
- 413
- Shares outstanding
- 34,330,771
- SEC-reported price per share
- $72.92
- Insider filing price
- $72.92
Latest holder snapshot
5 signals
Issuer context
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- TMDX - TransMedics Group, Inc. - Common Stock is tracked under CUSIP 89377M109.
- 413 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 427 to 413 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $4,524,886,767 to $3,622,229,168.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 413 institutions filings for Q1 2026.
Security key
89377M109
Latest holder period
Q1 2026
13F holders
413
13D/G owners
4
CIK / CUSIP context first
Open Q1 2026 holders
TMDX full holder history
TransMedics Group, Inc. SEC filings
TransMedics Group, Inc. company facts
TransMedics Group, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 89377M109:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
4
Security
TMDX
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 15% | +16% | $467,547,574 | +$64,260,663 | 5,058,396 | +16% | FMR LLC | 31 Mar 2025 |
| BlackRock, Inc. | 15% | $664,054,661 | 4,955,262 | BlackRock, Inc. | 30 Jun 2025 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.7% | $193,791,842 | 1,949,420 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.1% | $172,688,789 | 1,737,137 | Vanguard Capital Management | 31 Mar 2026 |
As of 31 Mar 2026, 413 institutional investors reported holding 36,436,809 shares of TransMedics Group, Inc. - Common Stock (TMDX). This represents 106% of the company’s total 34,330,771 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
77%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 15% | 5,293,331 | -1.9% | 0.01% | $526,210,036 |
| FMR LLC | 15% | 5,096,243 | +0.38% | 0.03% | $506,617,469 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.6% | 1,919,535 | 0% | 0.01% | $190,820,974 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.3% | 1,478,152 | 0% | 0% | $146,943,090 |
| STATE STREET CORP | 3.8% | 1,319,479 | +3.5% | 0% | $131,169,407 |
| Invesco Ltd. | 3% | 1,037,974 | +52% | 0.02% | $103,184,995 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 2.7% | 939,523 | -5.8% | 0.02% | $93,397,982 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 2.6% | 885,841 | +6.4% | 0.15% | $88,061,000 |
| GOLDMAN SACHS GROUP INC | 2.5% | 866,282 | -10% | 0.01% | $86,117,068 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 839,155 | +2.8% | 0.01% | $83,435,834 |
| Hood River Capital Management LLC | 2% | 699,770 | +1.4% | 0.7% | $69,564,136 |
| MORGAN STANLEY | 2% | 694,150 | +4% | 0% | $69,005,561 |
| UBS Group AG | 1.7% | 580,793 | -12% | 0.01% | $57,736,632 |
| EVENTIDE ASSET MANAGEMENT, LLC | 1.6% | 548,824 | +0.1% | 0.9% | $54,531,064 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 516,679 | +5.5% | 0.01% | $51,354,981 |
| WELLINGTON MANAGEMENT GROUP LLP | 1.4% | 486,473 | +12% | 0.01% | $48,360,280 |
| Capital World Investors | 1.1% | 374,177 | +65% | 0.01% | $37,196,936 |
| CITIGROUP INC | 1% | 357,381 | +396% | 0.02% | $35,527,245 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1% | 346,683 | -39% | 0% | $34,464,000 |
| WASATCH ADVISORS LP | 1% | 346,144 | +4.3% | 0.23% | $34,410,175 |
| EMERALD ADVISERS, LLC | 1% | 342,791 | -2.4% | 1.1% | $34,076,853 |
| NORTHERN TRUST CORP | 0.99% | 338,159 | -0.31% | 0% | $33,616,386 |
| BRAIDWELL LP | 0.96% | 329,391 | +4.5% | 1.1% | $32,744,759 |
| TWO SIGMA INVESTMENTS, LP | 0.95% | 325,140 | -25% | 0.03% | $32,322,167 |
| FRONTIER CAPITAL MANAGEMENT CO LLC | 0.93% | 320,471 | +5.8% | 0.33% | $31,858,071 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
29
Latest
Q1 2026
Rows shown
1-25 of 29
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 36,436,809 | $3,622,229,168 | -$96,771,717 | $99.41 | 413 |
| 2025 Q4 | 37,185,146 | $4,524,886,767 | -$84,215,477 | $121.65 | 427 |
| 2025 Q3 | 37,129,044 | $4,166,232,859 | -$8,088,244 | $112.20 | 386 |
| 2025 Q2 | 36,786,193 | $4,927,662,357 | -$289,195,543 | $134.01 | 366 |
| 2025 Q1 | 39,009,472 | $2,625,618,476 | +$165,932,691 | $67.28 | 295 |
| 2024 Q4 | 36,855,938 | $2,297,784,694 | -$388,696,786 | $62.35 | 308 |
| 2024 Q3 | 36,492,550 | $5,723,369,932 | +$61,413,519 | $157.00 | 365 |
| 2024 Q2 | 33,743,529 | $5,082,407,329 | +$90,020,373 | $150.62 | 331 |
| 2024 Q1 | 34,019,976 | $2,515,517,054 | -$71,270,565 | $73.94 | 251 |
| 2023 Q4 | 34,973,168 | $2,760,564,347 | -$4,091,949 | $78.93 | 244 |
| 2023 Q3 | 34,944,103 | $1,913,888,694 | +$75,708,281 | $54.75 | 218 |
| 2023 Q2 | 32,524,695 | $2,731,143,204 | +$226,755,585 | $83.98 | 238 |
| 2023 Q1 | 29,891,511 | $2,263,659,591 | +$69,279,751 | $75.73 | 221 |
| 2022 Q4 | 28,992,696 | $1,789,417,886 | +$38,499,424 | $61.72 | 196 |
| 2022 Q3 | 28,283,349 | $1,180,766,429 | +$229,245,326 | $41.74 | 174 |
| 2022 Q2 | 22,873,577 | $719,448,960 | +$66,828,071 | $31.45 | 129 |
| 2022 Q1 | 20,846,434 | $561,189,812 | +$24,725,042 | $26.94 | 107 |
| 2021 Q4 | 20,080,660 | $384,713,814 | +$27,430,654 | $19.16 | 116 |
| 2021 Q3 | 19,228,003 | $636,263,034 | +$13,347,336 | $33.09 | 116 |
| 2021 Q2 | 18,779,205 | $623,049,047 | +$1,144,101 | $33.18 | 117 |
| 2021 Q1 | 18,628,828 | $772,924,082 | -$21,007,487 | $41.49 | 104 |
| 2020 Q4 | 21,299,571 | $423,671,614 | -$4,482,122 | $19.90 | 67 |
| 2020 Q3 | 20,827,226 | $287,000,555 | +$6,185,866 | $13.78 | 71 |
| 2020 Q2 | 20,159,299 | $361,233,740 | +$92,950,873 | $17.92 | 68 |
| 2020 Q1 | 15,072,652 | $182,072,226 | -$2,049,598 | $12.08 | 53 |