TRANSMEDICS GROUP INC (TMDX)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
Institutions report 34,821,941 shares against 34,675,145 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $371.7M | 5,596,549 | 0.01% | 8q | +5.7%+$20.1M |
| FMR LLC | $341.0M | 5,133,328 | 0.01% | 29q | +0.7%+$2.5M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $128.5M | 1,933,989 | 0.01% | 2q | +0.8%+$960.0K |
| VANGUARD CAPITAL MANAGEMENT LLC | $99.5M | 1,497,600 | 0.00% | 2q | +1.3%+$1.3M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $95.8M incl. $78.8M options CALL+PUT | 255,398 | 0.01% | 18q | +90.8%+$45.6M |
| STATE STREET CORP | $94.3M | 1,420,421 | 0.00% | 29q | +7.7%+$6.7M |
| CITADEL ADVISORS LLC | $94.1M incl. $57.0M options CALL+PUT | 558,824 | 0.01% | 24q | +807.2%+$83.8M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $60.5M | 910,495 | 0.09% | 3q | +2.8%+$1.6M |
| GEODE CAPITAL MANAGEMENT, LLC | $59.5M | 894,913 | 0.00% | 29q | +6.6%+$3.7M |
| Tidal Investments LLC | $49.9M incl. $33.2M options PUT | 251,196 | 0.09% | new | NEW |
| Hood River Capital Management LLC | $49.9M | 751,133 | 0.36% | 6q | +7.3%+$3.4M |
| JANE STREET GROUP, LLC | $40.9M CALL+PUT | options only | 0.00% | 17q | OPTIONS |
| DIMENSIONAL FUND ADVISORS LP | $40.5M | 610,107 | 0.01% | 8q | +18.1%+$6.2M |
| BRAIDWELL LP | $40.5M | 609,715 | 1.50% | 7q | +85.1%+$18.6M |
| GOLDMAN SACHS GROUP INC | $37.2M | 559,771 | 0.00% | 26q | -35.4%-$20.4M |
| EVENTIDE ASSET MANAGEMENT, LLC | $36.5M | 548,874 | 0.49% | 13q | HELD |
| WELLINGTON MANAGEMENT GROUP LLP | $34.3M | 515,973 | 0.01% | 9q | +6.1%+$2.0M |
| EMERALD ADVISERS, LLC | $32.6M | 490,491 | 0.77% | 29q | +43.1%+$9.8M |
| UBS Group AG | $32.5M incl. $66.4K options CALL | 488,058 | 0.00% | 29q | -16.0%-$6.2M |
| MORGAN STANLEY | $26.9M | 405,112 | 0.00% | 29q | -41.6%-$19.2M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $26.5M | 398,250 | 0.00% | 21q | -57.6%-$36.0M |
| Invesco Ltd. | $26.2M | 394,979 | 0.00% | 22q | -61.9%-$42.7M |
| CITIGROUP INC | $25.6M | 386,066 | 0.01% | 29q | +8.0%+$1.9M |
| Capital World Investors | $25.5M | 384,671 | 0.00% | 6q | +2.8%+$697.0K |
| IMC-Chicago, LLC | $25.4M incl. $19.3M options CALL+PUT | 90,515 | 0.01% | 8q | +226.9%+$17.6M |
| NORTHERN TRUST CORP | $24.5M | 368,860 | 0.00% | 29q | +9.1%+$2.0M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $21.8M | 328,666 | 0.00% | 29q | +3.1%+$646.9K |
| WASATCH ADVISORS LP | $20.5M | 308,434 | 0.13% | 10q | -10.9%-$2.5M |
| ZEVENBERGEN CAPITAL INVESTMENTS LLC | $20.5M | 308,391 | 0.47% | 5q | +7.6%+$1.5M |
| EMERALD MUTUAL FUND ADVISERS TRUST | $20.1M | 302,074 | 0.71% | 29q | +31.7%+$4.8M |
| BAILLIE GIFFORD & CO | $17.8M | 267,935 | 0.02% | 22q | -12.2%-$2.5M |
| MILLENNIUM MANAGEMENT LLC | $17.5M incl. $976.4K options CALL | 248,312 | 0.01% | 17q | -18.9%-$4.1M |
| WELLS FARGO & COMPANY/MN | $17.3M | 260,218 | 0.00% | 29q | -5.0%-$902.2K |
| BANK OF AMERICA CORP /DE/ | $17.1M | 257,001 | 0.00% | 29q | -12.9%-$2.5M |
| VANGUARD FIDUCIARY TRUST CO | $16.3M | 245,680 | 0.00% | 2q | +3.9%+$616.8K |
| PRINCIPAL FINANCIAL GROUP INC | $16.0M | 240,867 | 0.01% | 22q | +4.1%+$626.6K |
| BARCLAYS PLC | $15.8M | 237,615 | 0.00% | 29q | +24.7%+$3.1M |
| CONGRESS ASSET MANAGEMENT CO | $15.1M | 227,834 | 0.09% | new | NEW |
| DEUTSCHE BANK AG\ | $14.4M | 217,031 | 0.00% | 29q | +11.1%+$1.4M |
| Point72 Asset Management, L.P. | $14.1M incl. $1.3M options CALL+PUT | 192,594 | 0.02% | 3q | HELD |
| JPMORGAN CHASE & CO | $13.0M | 192,269 | 0.00% | 29q | -37.6%-$7.9M |
| Bank of New York Mellon Corp | $12.9M | 193,752 | 0.00% | 29q | -8.3%-$1.2M |
| FirstWave Capital Management LLC | $12.7M | 191,240 | 5.61% | 3q | +53.9%+$4.4M |
| Davidson Kempner Capital Management LP | $11.1M | 166,900 | 0.13% | 6q | +14.0%+$1.4M |
| HRT FINANCIAL LP | $11.0M | 165,106 | 0.02% | 2q | +398.8%+$8.8M |
| FRONTIER CAPITAL MANAGEMENT CO LLC | $10.0M | 150,162 | 0.09% | 7q | -53.1%-$11.3M |
| Public Sector Pension Investment Board | $7.9M | 118,746 | 0.02% | 8q | -2.9%-$233.1K |
| OPPENHEIMER & CO INC | $7.4M | 110,752 | 0.08% | 18q | -2.4%-$180.7K |
| RENAISSANCE GROUP LLC | $7.2M | 108,157 | 0.29% | 4q | +15.6%+$970.7K |
| Bellevue Group AG | $6.7M | 101,139 | 0.14% | 25q | HELD |
| Lagoda Investment Management, L.P. | $6.5M | 97,465 | 3.56% | 14q | +7.7%+$460.6K |
| BNP PARIBAS FINANCIAL MARKETS | $6.4M | 96,337 | 0.00% | 29q | -33.3%-$3.2M |
| Trexquant Investment LP | $6.2M | 93,960 | 0.04% | 5q | -11.6%-$819.6K |
| LAZARD ASSET MANAGEMENT LLC | $6.1M | 92,549 | 0.01% | 14q | +42.8%+$1.8M |
| BROWN CAPITAL MANAGEMENT LLC | $6.0M | 89,828 | 1.19% | 6q | -8.3%-$539.7K |
| Portolan Capital Management, LLC | $5.5M | 82,354 | 0.20% | 4q | +670.5%+$4.8M |
| RHUMBLINE ADVISERS | $5.3M | 80,220 | 0.00% | 27q | -10.7%-$637.9K |
| AMERIPRISE FINANCIAL INC | $5.3M | 79,948 | 0.00% | 16q | -23.7%-$1.6M |
| Legal & General Group Plc | $5.3M | 79,582 | 0.00% | 29q | +1.1%+$55.1K |
| Nuveen, LLC | $5.3M | 79,310 | 0.00% | 6q | +1.1%+$59.2K |
| ALLIANCEBERNSTEIN L.P. | $5.1M | 51,651 | 0.00% | 28q | +20.8%+$883.5K |
| Bastion Asset Management Inc. | $5.1M | 79,452 | 1.73% | 4q | +43.3%+$1.5M |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | $5.0M | 75,090 | 0.00% | new | NEW |
| AMERICAN CENTURY COMPANIES INC | $4.7M | 70,830 | 0.00% | 3q | +13.2%+$547.0K |
| SIMPLEX TRADING, LLC | $4.7M incl. $4.6M options CALL+PUT | 734 | 0.00% | 22q | HELD |
| BANK OF MONTREAL /CAN/ | $4.6M | 69,601 | 0.00% | 13q | HELD |
| PEREGRINE CAPITAL MANAGEMENT LLC | $4.5M | 67,544 | 0.15% | 16q | +18.1%+$688.1K |
| Swiss National Bank | $4.3M | 65,400 | 0.00% | 21q | +1.9%+$79.7K |
| RAYMOND JAMES FINANCIAL INC | $4.3M incl. $5.0K options CALL | 64,481 | 0.00% | 7q | -43.9%-$3.4M |
| SEI INVESTMENTS CO | $4.2M | 63,474 | 0.00% | 18q | -8.8%-$408.8K |
| Ensign Peak Advisors, Inc | $3.8M | 57,381 | 0.01% | 19q | -24.1%-$1.2M |
| ALGERT GLOBAL LLC | $3.8M | 57,154 | 0.05% | 9q | +124.6%+$2.1M |
| OSAIC HOLDINGS, INC. | $3.6M incl. $1.2K options CALL | 54,036 | 0.00% | 26q | +673.3%+$3.1M |
| ENVESTNET ASSET MANAGEMENT INC | $3.5M | 52,828 | 0.00% | 27q | -54.7%-$4.2M |
| F/m Investments LLC | $3.4M | 51,906 | 0.18% | 9q | +29.5%+$785.1K |
| Empowered Funds, LLC | $3.2M | 48,154 | 0.02% | new | NEW |
| FIRST TRUST ADVISORS LP | $3.2M | 48,108 | 0.00% | 5q | -10.7%-$384.0K |
| PRICE T ROWE ASSOCIATES INC /MD/ | $3.1M | 46,028 | 0.00% | 19q | -86.7%-$20.0M |
| BESSEMER GROUP INC | $3.0M | 45,799 | 0.00% | 8q | HELD |
| Biondo Investment Advisors, LLC | $2.9M | 44,155 | 0.36% | 9q | -23.8%-$917.6K |
| LPL Financial LLC | $2.8M | 42,725 | 0.00% | 16q | +7.1%+$187.9K |
| CREDIT AGRICOLE S A | $2.8M | 42,647 | 0.01% | 7q | -51.2%-$3.0M |
| TRILLIUM ASSET MANAGEMENT, LLC | $2.8M | 41,577 | 0.08% | 9q | +11.1%+$276.7K |
| GROUP ONE TRADING LLC | $2.7M incl. $2.0M options CALL+PUT | 9,527 | 0.00% | 8q | +50.4%+$890.5K |
| NORDEA INVESTMENT MANAGEMENT AB | $2.7M | 40,493 | 0.00% | 4q | +4.3%+$109.2K |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $2.6M | 39,850 | 0.00% | 29q | +5.3%+$133.5K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | $2.6M | 39,330 | 0.00% | 7q | -16.8%-$527.7K |
| Atom Investors LP | $2.4M | 36,501 | 0.22% | new | NEW |
| PRUDENTIAL FINANCIAL INC | $2.4M | 35,545 | 0.00% | 9q | -42.3%-$1.7M |
| Holocene Advisors, LP | $2.2M | 33,754 | 0.01% | new | NEW |
| Cambridge Investment Research Advisors, Inc. | $2.2M | 32,912 | 0.00% | 10q | +88.7%+$1.0M |
| VANGUARD ASSET MANAGEMENT, Ltd | $2.2M | 32,680 | 0.00% | 2q | +9.8%+$193.7K |
| Perigon Wealth Management, LLC | $2.2M incl. $697.4K options CALL | 21,964 | 0.03% | 9q | +4.8%+$99.2K |
| NORGES BANK | $2.0M | 30,574 | 0.00% | 7q | HELD |
| Emerald Investment Advisers, LLC | $2.0M | 30,456 | 0.13% | 2q | +21.6%+$359.6K |
| ArrowMark Colorado Holdings LLC | $2.0M | 30,151 | 0.08% | 16q | -82.4%-$9.4M |
| TUDOR INVESTMENT CORP ET AL | $2.0M CALL+PUT | options only | 0.00% | 12q | OPTIONS |
| STATE OF WISCONSIN INVESTMENT BOARD | $1.9M | 29,128 | 0.00% | 19q | -4.9%-$99.0K |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM | $1.9M | 28,849 | 0.00% | 8q | -2.0%-$38.6K |
| Brevan Howard Capital Management LP | $1.9M | 28,808 | 0.01% | new | NEW |
Showing the largest 100 of 384 reported holders.
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-09-10 | 2026-09-10 | Directors or officers departed or appointed | filing |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-15 | Gunderson Thomas J. | Director | Sold | 9,624 | $722.4K |
| 2026-09-11 | Weill David | Director | Bought | 1,336 | $109.1K |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 102 | $133.3M | 1,597,743 | 16 | 31 | 29 | 0.2% |
| Q2 2026 | 384 | $2.6B | 34,821,941 | 65 | 134 | 126 | 9.6% |
| Q1 2026 | 422 | $3.8B | 36,502,815 | 55 | 142 | 124 | 3.4% |
| Q4 2025 | 440 | $4.7B | 37,213,173 | 68 | 151 | 123 | 3.3% |
| Q3 2025 | 396 | $4.5B | 37,558,179 | 71 | 147 | 115 | 5.7% |
| Q2 2025 | 376 | $5.3B | 37,085,439 | 103 | 113 | 114 | 5.9% |
| Q1 2025 | 304 | $2.8B | 39,059,404 | 49 | 119 | 93 | 4.5% |
| Q4 2024 | 320 | $2.5B | 38,531,412 | 53 | 129 | 83 | 4.5% |
| Q3 2024 | 382 | $5.9B | 36,855,460 | 82 | 132 | 119 | 2.3% |
| Q2 2024 | 344 | $5.3B | 34,630,608 | 104 | 95 | 117 | 1.7% |
| Q1 2024 | 264 | $2.7B | 35,401,305 | 55 | 88 | 79 | 2.4% |
| Q4 2023 | 249 | $2.9B | 36,726,648 | 44 | 78 | 85 | 0.9% |
| Q3 2023 | 224 | $2.0B | 35,625,616 | 28 | 95 | 66 | 2.2% |
| Q2 2023 | 244 | $2.9B | 34,417,276 | 47 | 101 | 62 | 1.0% |
| Q1 2023 | 227 | $2.7B | 35,014,207 | 40 | 81 | 74 | 2.0% |
| Q4 2022 | 200 | $1.9B | 30,158,373 | 34 | 68 | 72 | 1.4% |
| Q3 2022 | 175 | $1.6B | 37,900,310 | 64 | 49 | 41 | 2.4% |
| Q2 2022 | 131 | $1.2B | 36,958,858 | 33 | 31 | 35 | 0.8% |
| Q1 2022 | 105 | $986.8M | 36,592,658 | 15 | 34 | 31 | 0.1% |
| Q4 2021 | 115 | $864.2M | 44,962,195 | 17 | 36 | 28 | 0.3% |
| Q3 2021 | 118 | $1.2B | 36,335,659 | 21 | 44 | 26 | 1.0% |
| Q2 2021 | 119 | $786.7M | 23,193,317 | 25 | 33 | 40 | 2.1% |
| Q1 2021 | 107 | $1.2B | 27,981,977 | 49 | 33 | 20 | 1.5% |
| Q4 2020 | 68 | $595.5M | 29,862,199 | 6 | 29 | 17 | 0.2% |
| Q3 2020 | 73 | $405.7M | 29,365,306 | 17 | 29 | 16 | 0.3% |
| Q2 2020 | 67 | $482.9M | 26,949,488 | 20 | 31 | 10 | 0.0% |
| Q1 2020 | 54 | $340.6M | 28,197,186 | 6 | 21 | 15 | 0.0% |
| Q4 2019 | 58 | $390.6M | 20,547,847 | 14 | 32 | 3 | 0.0% |
| Q3 2019 | 49 | $341.6M | 14,494,375 | 5 | 19 | 12 | 0.0% |
| Q2 2019 | 62 | $392.5M | 14,040,766 | 61 | 0 | 0 | 0.0% |
| Q1 2019 | 1 | $2.0K | 54 | 1 | 0 | 0 | 0.0% |
