TMDX Institutional Ownership & Shareholders
TRANSMEDICS GROUP INC (TMDX) is currently held by 380 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $2.46B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of TMDX tracked by InsiderSet, reporting ownership valued at approximately $371.72M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $386.05M, representing an estimated gain of +3.85% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 55% of the total disclosed TMDX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Fmr Llc, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in TRANSMEDICS GROUP INC (TMDX).
This page ranks the largest institutional TMDX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
380
Total Reported Value
$2.46B
Largest Holder
Blackrock, Inc.
Largest Position
$371.72M
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
54
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 5,596,549 | $371,722,787 | $386,049,950 | +$14,327,163 | +3.85% | |
| Fmr Llc | 0.02% | 4,998,009 | $336,266,071 | $344,762,661 | +$8,496,590 | +2.53% | |
| Vanguard Portfolio Management Llc | 0.01% | 1,933,989 | $128,455,549 | $133,406,561 | +$4,951,012 | +3.85% | |
| Vanguard Capital Management Llc | 0.00% | 1,497,600 | $99,470,592 | $103,304,448 | +$3,833,856 | +3.85% | |
| State Street Corp | 0.00% | 1,420,421 | $94,344,363 | $97,980,641 | +$3,636,278 | +3.85% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 939,523 | $93,397,982 | $64,808,297 | -$28,589,685 | -30.61% | |
| Geode Capital Management, Llc | 0.00% | 888,690 | $74,175,143 | $61,301,836 | -$12,873,307 | -17.36% | |
| Nomura Asset Management International Inc. | 0.09% | 910,495 | $60,475,000 | $62,805,945 | +$2,330,945 | +3.85% | |
| Dimensional Fund Advisors Lp | 0.01% | 627,984 | $52,406,511 | $43,318,336 | -$9,088,175 | -17.34% | |
| Hood River Capital Management Llc | 0.36% | 751,133 | $49,890,254 | $51,813,154 | +$1,922,900 | +3.85% | |
| Braidwell Lp | 1.50% | 609,715 | $40,497,270 | $42,058,141 | +$1,560,871 | +3.85% | |
| Goldman Sachs Group Inc | 0.00% | 559,771 | $37,179,978 | $38,613,004 | +$1,433,026 | +3.85% | |
| Citadel Advisors Llc | 0.02% | 558,824 | $37,117,090 | $38,547,680 | +$1,430,590 | +3.85% | |
| Eventide Asset Management, Llc | 0.49% | 548,874 | $36,461,050 | $37,861,329 | +$1,400,279 | +3.84% | |
| Wellington Management Group Llp | 0.01% | 515,973 | $34,270,927 | $35,591,818 | +$1,320,891 | +3.85% | |
| Emerald Advisers, Llc | 0.77% | 490,491 | $32,578,412 | $33,834,069 | +$1,255,657 | +3.85% | |
| Ubs Group Ag | 0.01% | 488,058 | $32,416,813 | $33,666,241 | +$1,249,428 | +3.85% | |
| Principal Financial Group Inc | 0.02% | 372,534 | $31,087,963 | $25,697,395 | -$5,390,568 | -17.34% | |
| Wasatch Advisors Lp | 0.21% | 333,162 | $27,802,369 | $22,981,515 | -$4,820,854 | -17.34% | |
| Barclays Plc | 0.01% | 332,599 | $27,755,385 | $22,942,679 | -$4,812,706 | -17.34% | |
| Morgan Stanley | 0.00% | 405,112 | $26,907,578 | $27,944,626 | +$1,037,048 | +3.85% | |
| Invesco Ltd. | 0.00% | 394,979 | $26,234,505 | $27,245,651 | +$1,011,146 | +3.85% | |
| Capital World Investors | 0.00% | 384,671 | $25,549,848 | $26,534,606 | +$984,758 | +3.85% | |
| Northern Trust Corp | 0.00% | 368,860 | $24,499,681 | $25,443,963 | +$944,282 | +3.85% | |
| Zevenbergen Capital Investments Llc | 0.51% | 267,282 | $22,304,683 | $18,437,112 | -$3,867,571 | -17.34% | |
| Charles Schwab Investment Management Inc | 0.00% | 328,666 | $21,829,996 | $22,671,381 | +$841,385 | +3.85% | |
| Congress Asset Management Co | 0.14% | 252,952 | $21,108,844 | $17,448,629 | -$3,660,215 | -17.34% | |
| Emerald Mutual Fund Advisers Trust | 0.71% | 302,074 | $20,063,755 | $20,837,065 | +$773,310 | +3.85% | |
| Deutsche Bank Ag\ | 0.01% | 221,570 | $18,490,017 | $15,283,899 | -$3,206,118 | -17.34% | |
| Baillie Gifford & Co | 0.02% | 267,935 | $17,796,243 | $18,482,156 | +$685,913 | +3.85% | |
| Wells Fargo & Company/Mn | 0.00% | 260,218 | $17,283,662 | $17,949,838 | +$666,176 | +3.85% | |
| Bank Of America Corp | 0.00% | 257,001 | $17,070,007 | $17,727,929 | +$657,922 | +3.85% | |
| Susquehanna International Group, Llp | 0.02% | 255,398 | $16,963,535 | $17,617,354 | +$653,819 | +3.85% | |
| Tidal Investments Llc | 0.04% | 251,196 | $16,684,438 | $17,327,500 | +$643,062 | +3.85% | |
| Millennium Management Llc | 0.01% | 248,312 | $16,492,883 | $17,128,562 | +$635,679 | +3.85% | |
| Vanguard Fiduciary Trust Co | 0.00% | 245,680 | $16,318,066 | $16,947,006 | +$628,940 | +3.85% | |
| Bank Of New York Mellon Corp | 0.00% | 191,672 | $15,995,017 | $13,221,535 | -$2,773,482 | -17.34% | |
| Jpmorgan Chase & Co | 0.00% | 192,269 | $13,039,523 | $13,262,716 | +$223,193 | +1.71% | |
| Point72 Asset Management, L.P. | 0.02% | 192,594 | $12,792,093 | $13,285,134 | +$493,041 | +3.85% | |
| Firstwave Capital Management Llc | 5.61% | 191,240 | $12,702,161 | $13,191,735 | +$489,574 | +3.85% | |
| Trek Financial, Llc | 0.56% | 143,667 | $11,989,011 | $9,910,150 | -$2,078,861 | -17.34% | |
| Davidson Kempner Capital Management Lp | 0.18% | 166,900 | $11,085,498 | $11,512,762 | +$427,264 | +3.85% | |
| Hrt Financial Lp | 0.02% | 165,106 | $10,966,000 | $11,389,012 | +$423,012 | +3.86% | |
| Frontier Capital Management Co Llc | 0.09% | 150,162 | $9,973,731 | $10,358,175 | +$384,444 | +3.85% | |
| Oppenheimer & Co Inc | 0.09% | 107,041 | $8,932,571 | $7,383,688 | -$1,548,883 | -17.34% | |
| Citigroup Inc | 0.00% | 102,878 | $8,585,169 | $7,096,524 | -$1,488,645 | -17.34% | |
| Public Sector Pension Investment Board | 0.02% | 118,746 | $7,887,109 | $8,191,099 | +$303,990 | +3.85% | |
| Ensign Peak Advisors, Inc | 0.01% | 75,569 | $7,512,314 | $5,212,750 | -$2,299,564 | -30.61% | |
| Brown Capital Management Llc | 1.42% | 89,828 | $7,496,147 | $6,196,335 | -$1,299,812 | -17.34% | |
| Janus Henderson Group Plc | 0.00% | 73,488 | $7,305,518 | $5,069,202 | -$2,236,316 | -30.61% |
Frequently asked questions about TMDX
Who are the largest institutional holders of TMDX?
The largest institutional holders of TMDX reported in the latest SEC Form 13F filings include Blackrock, Inc., Fmr Llc, Vanguard Portfolio Management Llc, Vanguard Capital Management Llc, and State Street Corp. InsiderSet ranks institutional holders by their latest reported TMDX position.
What is TMDX institutional ownership?
This page tracks TMDX positions reported by institutional investment managers through SEC Form 13F. TRANSMEDICS GROUP INC (TMDX) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own TMDX?
InsiderSet currently tracks 380 institutional managers reporting TMDX holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of TMDX shareholders.
How much TMDX stock do institutions own?
Institutional investment managers disclosed approximately $2.46B in TMDX holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was TMDX institutional ownership last updated?
The latest TMDX institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional TMDX holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its TMDX position after the reporting date.
Are institutions buying or selling TMDX?
Institutional buying and selling can be analyzed by comparing TMDX positions across consecutive 13F reporting periods. InsiderSet's TMDX Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View TMDX ownership changes.
How has TMDX institutional ownership changed over time?
InsiderSet tracks TMDX institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.