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TMDX in the 13F filings

TransMedics Group · CUSIP 89377M109

Sector · Medical devices and instrumentsTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Surgical, medical and electromedical devices
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
23
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 5 listed it in both
Shares listed
8,395,725
combined, among listed positions
Reported value
$559m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 14 buyers (opened or added shares) and 17 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -717,933.

Managers listing TMDX in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

23 of 23 holders

ActionFiling
Fidelity (FMR LLC)5,133,328$341munder 0.1%Added+37,08513 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC558,824$37munder 0.1%Added+497,2232 Sep 2026 (the filing on sec.gov)
Wellington Management Group LLP515,973$34munder 0.1%Added+29,50014 Aug 2026 (the filing on sec.gov)
Invesco Ltd394,979$26munder 0.1%Trimmed-642,99514 Aug 2026 (the filing on sec.gov)
Capital World Investors384,671$26munder 0.1%Added+10,49412 Aug 2026 (the filing on sec.gov)
Baillie Gifford & Co267,935$18munder 0.1%Trimmed-37,2596 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP255,398$17munder 0.1%Added+121,52314 Aug 2026 (the filing on sec.gov)
Millennium Management LLC248,312$16munder 0.1%Trimmed-57,76814 Aug 2026 (the filing on sec.gov)
Point72 Asset Management LP192,594$13munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Davidson Kempner Capital Management LP166,900$11m0.13%Added+20,50014 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP51,651$5.1munder 0.1%Added+8,88714 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc46,028$3.1munder 0.1%Trimmed-300,65514 Aug 2026 (the filing on sec.gov)
Holocene Advisors LP33,754$2.2munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP28,808$1.9munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC27,947$1.9munder 0.1%Added+20,16814 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC22,531$1.5munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Winton Group Ltd18,203$1.2munder 0.1%Added+6,2627 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd15,263$1.0munder 0.1%Trimmed-58,22514 Aug 2026 (the filing on sec.gov)
Man Group PLC11,327$752kunder 0.1%Trimmed-147,08214 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP8,945$594kunder 0.1%Trimmed-316,19514 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP8,553$568kunder 0.1%Trimmed-106,79214 Aug 2026 (the filing on sec.gov)
Freestone Grove Partners LP3,537$235kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC264$18kunder 0.1%Trimmed-1,9493 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (5)

Exited (8)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
8 in Q3 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

051015202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
TMDX by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20191$1.2mn.a.n.a.
Q1 20211$17kn.a.n.a.
Q2 20212$11mn.a.n.a.
Q3 20211$40kn.a.n.a.
Q4 20211$555kn.a.n.a.
Q1 20221$948kn.a.n.a.
Q2 20221$1.1mn.a.n.a.
Q3 20224$8.7mn.a.n.a.
Q4 20222$20mn.a.n.a.
Q1 20233$30mn.a.n.a.
Q2 20232$22mn.a.n.a.
Q3 20234$63mn.a.n.a.
Q4 20234$84m22
Q1 20242$51m11
Q2 20247$796m52
Q3 20248$190m53
Q4 20244$61m34
Q1 20255$40m42
Q2 202511$957m92
Q3 20258$820m43
Q4 20258$811m1617
Q1 20266$95m1613
Q2 20263$30m1417

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

TMDX and LLY →TMDX and JNJ →TMDX and VRTX →Choose a stock to compare with TMDX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own TMDX, latest filings →Back to the 13F Explorer →