TMDX · TransMedics Group, Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Holder Concentration
Across 382 13F filersWho Holds TMDX
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 375 filers, like-for-like change -4.7%; actively managed books -4.2%; index-like books -5.4%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 36.6% | 192 | -4.7% |
| Exempt adviser | 0.6% | 3 | +57.9% |
| Adviser | 6.2% | 11 | -26.3% |
| Bank | 11.2% | 18 | -2.2% |
| Insurer | 0.8% | 3 | -2.0% |
| Broker-dealer | 0.2% | 2 | +13.0% |
| Benefit plan | 0.2% | 3 | -12.9% |
| Non-US | 1.8% | 10 | -5.9% |
| Holding company | 35.3% | 8 | -1.5% |
| Registered fund | 0.0% | 0 | — |
| Unknown | 7.0% | 125 | -2.5% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 35.1% | 37 | -5.4% |
| Systematic-like | 3.7% | 19 | +30.6% |
| Concentrated | 0.7% | 51 | -6.3% |
| Diversified active | 60.5% | 268 | -5.7% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 58.8% | 212 | -8.9% |
| Medium turnover | 20.3% | 91 | -2.9% |
| High turnover | 6.4% | 40 | +31.9% |
| Unknown | 14.4% | 32 | -0.3% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 14.9% | 43 | -0.7% |
| Medium horizon | 19.5% | 62 | +7.2% |
| Long horizon | 58.7% | 249 | -10.2% |
| Unknown | 6.9% | 21 | +9.6% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 2.4% | 93 | -7.1% |
| $1B to $10B | 10.4% | 112 | +12.3% |
| $10B to $100B | 12.8% | 100 | -10.5% |
| $100B or more | 74.5% | 70 | -5.5% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.7% | 102 | -32.6% |
| Pooled investment vehicles | 5.7% | 25 | +24.0% |
| Registered funds and BDCs | 22.3% | 26 | -2.2% |
| Pension and profit sharing plans | 0.1% | 3 | -19.6% |
| Insurance companies | 0.1% | 3 | +8.4% |
| Charitable organizations | 0.0% | 1 | 0.0% |
| Governments and sovereign funds | 2.2% | 5 | +27.5% |
| Corporations | 0.0% | 1 | 0.0% |
| Other investment advisers | 0.0% | 4 | -31.3% |
| Other | 0.5% | 4 | +19.4% |
| Diversified | 4.0% | 18 | -34.3% |
| Unknown | 63.4% | 183 | -4.7% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 7.1% | 37 | +17.8% |
| Private equity funds | 2.7% | 15 | -10.3% |
| Venture capital funds | 1.6% | 2 | 0.0% |
| Real estate funds | 0.0% | 5 | -18.7% |
| Securitized asset funds | 1.1% | 1 | -57.6% |
| Other private funds | 3.9% | 15 | -43.8% |
| Mixed private funds | 0.1% | 1 | +2.9% |
| Private funds, type not stated | 0.0% | 1 | -63.8% |
| No private funds | 20.7% | 118 | +12.3% |
| Unknown | 62.8% | 180 | -5.0% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 93.4% | 319 | -3.9% |
| Outside the US | 6.6% | 56 | -14.0% |
| Unknown | 0.0% | 0 | -100.0% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 5 holders with no observed 2026-03-31 13F and 2 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
375 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 32.4% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies TMDX's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | ALMR Alamar Biosciences, Inc. | 4 |
| 2 | MIR Mirion Technologies, Inc. | 6 |
| 3 | PVLA Palvella Therapeutics, Inc. | 5 |
| 4 | ATEC Alphatec Holdings, Inc. | 5 |
| 5 | OLLI Ollie's Bargain Outlet Holdings, Inc. | 6 |
| 6 | LIVN LivaNova PLC | 5 |
| 7 | QTWO Q2 Holdings, Inc. | 4 |
| 8 | HNGE Hinge Health, Inc. | 6 |
| 9 | GH Guardant Health, Inc. | 9 |
| 10 | CDNL Cardinal Infrastructure Group Inc. | 4 |
Shareholder Targets
13F filers that own its peers but not TMDX, quarter ended Jun 30, 2026Found through its holder-overlap peers: ALMR, MIR, PVLA, ATEC, OLLI, LIVN, QTWO, HNGE, GH, CDNL, CYTK, BOOT, BLLN, AMSC, PRCT, CORT, LPTH, INSP, NKTR, XMTR. 1,145 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | T. Rowe Price Investment Management, Inc. Adviser, Diversified active | $2,192,459,358 10 held | CYTK, MIR, OLLI |
| 2 | PRIMECAP MANAGEMENT CO/CA/ Registered adviser, Diversified active | $1,116,232,108 6 held | XMTR, LIVN, OLLI |
| 3 | FULLER & THALER ASSET MANAGEMENT, INC. Registered adviser, Diversified active | $786,813,400 6 held | GH, HNGE, XMTR |
| 4 | Capital International Investors Adviser, Diversified active | $710,537,788 4 held | GH, CYTK, OLLI |
| 5 | INGALLS & SNYDER LLC Registered adviser, Diversified active | $689,905,383 1 held | CORT |
| 6 | RENAISSANCE TECHNOLOGIES LLC Registered adviser, Diversified active | $610,486,177 11 held | CORT, HNGE, INSP |
| 7 | Driehaus Capital Management LLC Registered adviser, Diversified active | $592,624,822 5 held | GH, XMTR, CDNL |
| 8 | Deep Track Capital, LP Adviser, Diversified active | $589,674,599 3 held | GH, CYTK, NKTR |
| 9 | FEDERATED HERMES, INC. Adviser, Diversified active | $581,771,933 13 held | GH, PVLA, QTWO |
| 10 | D. E. Shaw & Co., Inc. Unknown, Systematic-like | $549,484,246 12 held | GH, CYTK, CORT |
Fund Ownership of TMDX by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 28.33% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 4.76% | 1,650,386 |
| Index ETFs | 23.57% | 8,172,517 |
| Active ETFs | 1.61% | 558,238 |
| Active funds | 23.48% | 8,142,344 |
| Unclassified | 0.49% | 169,593 |
| All registered funds | 53.91% | 18,693,078 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $371,722,775 | 14.58% | 5,596,549 | Shares | 2026-08-07 | |
| Mega FMR LLC Holding company | $340,955,642 | 13.38% | 5,133,328 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $128,455,549 | 5.04% | 1,933,989 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $99,470,592 | 3.90% | 1,497,600 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $94,344,362 | 3.70% | 1,420,421 | Shares | 2026-09-22 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $60,475,077 | 2.37% | 910,495 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $59,440,120 | 2.33% | 894,913 | Shares | 2026-08-12 | |
| Large Hood River Capital Management LLC Registered adviser | $49,890,253 | 1.96% | 751,133 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $44,182,584 | 1.73% | 665,200 | Call | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $40,523,303 | 1.59% | 610,107 | Shares | 2026-08-11 | |
| Mid BRAIDWELL LP Registered adviser | $40,497,270 | 1.59% | 609,715 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $37,179,989 | 1.46% | 559,771 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $37,117,090 | 1.46% | 558,824 | Shares | 2026-09-02 | |
| Mid EVENTIDE ASSET MANAGEMENT, LLC Registered adviser | $36,456,211 | 1.43% | 548,874 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $34,638,030 | 1.36% | 521,500 | Put | 2026-08-14 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $34,270,923 | 1.34% | 515,973 | Shares | 2026-08-14 | |
| Large Tidal Investments LLC Registered adviser | $33,210,000 | 1.30% | 500,000 | Put | 2026-08-13 | |
| Mid EMERALD ADVISERS, LLC Registered adviser | $32,578,412 | 1.28% | 490,491 | Shares | 2026-08-05 | |
| Mega UBS Group AG Bank | $32,416,811 | 1.27% | 488,058 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $29,842,506 | 1.17% | 449,300 | Put | 2026-09-02 | |
| Large WASATCH ADVISORS LP Registered adviser | $27,802,368 | 1.09% | 333,162 | Shares | 2026-10-13 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $27,172,422 | 1.07% | 409,100 | Call | 2026-09-02 | |
| Mega MORGAN STANLEY Holding company | $26,907,535 | 1.06% | 405,112 | Shares | 2026-08-13 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $26,451,761 | 1.04% | 398,250 | Shares | 2026-08-13 | |
| Mega Invesco Ltd. Adviser | $26,234,503 | 1.03% | 394,979 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $25,642,503 | 1.01% | 386,066 | Shares | 2026-08-03 | |
| Mega Capital World Investors Adviser | $25,549,847 | 1.00% | 384,671 | Shares | 2026-08-12 | |
| Mega NORTHERN TRUST CORP Bank | $24,499,678 | 0.96% | 368,860 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $23,638,878 | 0.93% | 355,900 | Call | 2026-08-14 | |
| Mid ZEVENBERGEN CAPITAL INVESTMENTS LLC Registered adviser | $22,304,682 | 0.88% | 267,282 | Shares | 2026-10-08 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $21,829,995 | 0.86% | 328,666 | Shares | 2026-08-14 | |
| Large CONGRESS ASSET MANAGEMENT CO Registered adviser | $21,108,844 | 0.83% | 252,952 | Shares | 2026-10-06 | |
| Mid EMERALD MUTUAL FUND ADVISERS TRUST Registered adviser | $20,063,755 | 0.79% | 302,074 | Shares | 2026-08-05 | |
| Mega BAILLIE GIFFORD & CO Adviser | $17,796,240 | 0.70% | 267,935 | Shares | 2026-08-06 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $17,283,678 | 0.68% | 260,218 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $17,229,348 | 0.68% | 259,400 | Put | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $17,070,003 | 0.67% | 257,001 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16,963,535 | 0.67% | 255,398 | Shares | 2026-08-14 | |
| Large Tidal Investments LLC Registered adviser | $16,684,438 | 0.65% | 251,196 | Shares | 2026-08-13 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $16,492,883 | 0.65% | 248,312 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $16,318,065 | 0.64% | 245,680 | Shares | 2026-08-13 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $15,998,386 | 0.63% | 240,867 | Shares | 2026-08-04 | |
| Mega BARCLAYS PLC Bank | $15,782,387 | 0.62% | 237,615 | Shares | 2026-08-14 | |
| Mega DEUTSCHE BANK AG\ Non-US | $14,415,197 | 0.57% | 217,031 | Shares | 2026-08-07 | |
| Mega Bank of New York Mellon Corp Bank | $12,869,003 | 0.50% | 193,752 | Shares | 2026-08-06 | |
| Large Point72 Asset Management, L.P. Registered adviser | $12,792,093 | 0.50% | 192,594 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $12,770,503 | 0.50% | 192,269 | Shares | 2026-08-12 | |
| Small FirstWave Capital Management LLC Exempt adviser | $12,702,160 | 0.50% | 191,240 | Shares | 2026-08-12 | |
| Mid Davidson Kempner Capital Management LP Registered adviser | $11,085,498 | 0.43% | 166,900 | Shares | 2026-08-14 | |
| Large HRT FINANCIAL LP | $10,966,340 | 0.43% | 165,106 | Shares | 2026-08-14 | |
| Large FRONTIER CAPITAL MANAGEMENT CO LLC Registered adviser | $9,973,760 | 0.39% | 150,162 | Shares | 2026-08-14 | |
| Large Public Sector Pension Investment Board Non-US | $7,887,109 | 0.31% | 118,746 | Shares | 2026-08-13 | |
| Mid OPPENHEIMER & CO INC | $7,356,147 | 0.29% | 110,752 | Shares | 2026-08-03 | |
| Mid RENAISSANCE GROUP LLC Registered adviser | $7,183,787 | 0.28% | 108,157 | Shares | 2026-08-13 | |
| Mid Bellevue Group AG Non-US | $6,717,652 | 0.26% | 101,139 | Shares | 2026-08-14 | |
| Small Lagoda Investment Management, L.P. Registered adviser | $6,473,625 | 0.25% | 97,465 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $6,398,703 | 0.25% | 96,337 | Shares | 2026-08-13 | |
| Large Trexquant Investment LP Registered adviser | $6,240,823 | 0.24% | 93,960 | Shares | 2026-08-14 | |
| Large LAZARD ASSET MANAGEMENT LLC Adviser | $6,147,104 | 0.24% | 92,549 | Shares | 2026-08-14 | |
| Large IMC-Chicago, LLC | $6,012,006 | 0.24% | 90,515 | Shares | 2026-08-06 | |
| Small BROWN CAPITAL MANAGEMENT LLC Registered adviser | $5,966,375 | 0.23% | 89,828 | Shares | 2026-07-27 | |
| Mid Portolan Capital Management, LLC | $5,469,952 | 0.21% | 82,354 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $5,328,212 | 0.21% | 80,220 | Shares | 2026-08-12 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $5,310,145 | 0.21% | 79,948 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $5,285,835 | 0.21% | 79,582 | Shares | 2026-08-14 | |
| Small Bastion Asset Management Inc. | $5,277,201 | 0.21% | 79,452 | Shares | 2026-08-10 | |
| Mega Nuveen, LLC | $5,267,770 | 0.21% | 79,310 | Shares | 2026-08-11 | |
| Mega DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | $4,987,477 | 0.20% | 75,090 | Shares | 2026-08-14 | |
| Mega AMERICAN CENTURY COMPANIES INC | $4,704,528 | 0.18% | 70,830 | Shares | 2026-08-12 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $4,622,895 | 0.18% | 69,601 | Shares | 2026-08-12 | |
| Mid PEREGRINE CAPITAL MANAGEMENT LLC Registered adviser | $4,486,272 | 0.18% | 67,544 | Shares | 2026-07-17 | |
| Mega Swiss National Bank | $4,343,868 | 0.17% | 65,400 | Shares | 2026-08-11 | |
| Mega RAYMOND JAMES FINANCIAL INC | $4,282,827 | 0.17% | 64,481 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO | $4,215,942 | 0.17% | 63,474 | Shares | 2026-08-14 | |
| Large Ensign Peak Advisors, Inc | $3,811,246 | 0.15% | 57,381 | Shares | 2026-08-14 | |
| Mid ALGERT GLOBAL LLC Registered adviser | $3,796,168 | 0.15% | 57,154 | Shares | 2026-08-13 | |
| Large OSAIC HOLDINGS, INC. Holding company | $3,589,068 | 0.14% | 54,036 | Shares | 2026-08-14 | |
| Mega ENVESTNET ASSET MANAGEMENT INC Registered adviser | $3,508,835 | 0.14% | 52,828 | Shares | 2026-09-23 | |
| Mid F/m Investments LLC Registered adviser | $3,447,596 | 0.14% | 51,906 | Shares | 2026-08-05 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $3,430,659 | 0.13% | 51,651 | Shares | 2026-08-14 | |
| Large Empowered Funds, LLC Registered adviser | $3,198,388 | 0.13% | 48,154 | Shares | 2026-08-17 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $3,195,333 | 0.13% | 48,108 | Shares | 2026-08-11 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $3,057,179 | 0.12% | 46,028 | Shares | 2026-08-14 | |
| Large BESSEMER GROUP INC | $3,039,315 | 0.12% | 45,799 | Shares | 2026-08-12 | |
| Small Biondo Investment Advisors, LLC Registered adviser | $2,932,775 | 0.12% | 44,155 | Shares | 2026-08-13 | |
| Mega LPL Financial LLC Broker-dealer | $2,837,794 | 0.11% | 42,725 | Shares | 2026-08-07 | |
| Large CREDIT AGRICOLE S A | $2,832,613 | 0.11% | 42,647 | Shares | 2026-08-14 | |
| Mid TRILLIUM ASSET MANAGEMENT, LLC Registered adviser | $2,761,544 | 0.11% | 41,577 | Shares | 2026-08-11 | |
| Mega NORDEA INVESTMENT MANAGEMENT AB Non-US | $2,689,544 | 0.11% | 40,493 | Shares | 2026-08-05 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $2,646,837 | 0.10% | 39,850 | Shares | 2026-08-24 | |
| Large Universal- Beteiligungs- und Servicegesellschaft mbH | $2,612,298 | 0.10% | 39,330 | Shares | 2026-08-06 | |
| Mid Atom Investors LP Registered adviser | $2,424,396 | 0.10% | 36,501 | Shares | 2026-08-14 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $2,360,898 | 0.09% | 35,545 | Shares | 2026-08-12 | |
| Large Holocene Advisors, LP Registered adviser | $2,241,940 | 0.09% | 33,754 | Shares | 2026-08-14 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $2,170,605 | 0.09% | 32,680 | Shares | 2026-08-13 | |
| Mega NORGES BANK Non-US | $2,030,725 | 0.08% | 30,574 | Shares | 2026-08-12 | |
| Mid Emerald Investment Advisers, LLC Registered adviser | $2,022,887 | 0.08% | 30,456 | Shares | 2026-08-12 | |
| Mid ArrowMark Colorado Holdings LLC Registered adviser | $2,002,629 | 0.08% | 30,151 | Shares | 2026-08-13 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD Benefit plan | $1,934,681 | 0.08% | 29,128 | Shares | 2026-08-14 | |
| Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM | $1,916,150 | 0.08% | 28,849 | Shares | 2026-07-23 |
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