TransMedics TMDX Institutional Ownership

NASDAQ TMDX

$86.40 -1.87 (-2.12%)

As of: Sep 9, 2026 · 3:59 PM EDT

Institutions by Trading Activity

376 Institutions

Increased 209 55.6%

Unchanged 44 11.7%

Reduced 123 32.7%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

100.65%

▼-4.79 pp QoQ

Shares Held by Institutions

34.80Mn

of 34.58Mn outstanding

▲+0.68% QoQ

Shares Outstanding

34.58Mn

-223.69K held outside 13F filers

Institutional Investors

376

filed 13F for Jun 2026

▼-36 vs prior quarter

Net Shares Added (QoQ)

+234.82K

accumulated since last quarter

Value of Holdings

$3.13Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

TransMedics Group, Inc. (NASDAQ:TMDX) has 376 institutional investors with active 13F positions as of June 2026.

Collectively, these holders controlled 100.6% of TransMedics's outstanding shares in June 2026, down from 105.4% in March 2026.
They increased total shares held in TransMedics by 0.68% from the prior quarter, while the number of investors in TMDX increased 3.87% year over year.
Among the 376 funds, 209 bought more TransMedics shares, 123 sold down, and 44 held their ground.
In total, institutional investors held 34.8Mn shares in TransMedics as of June 2026, up by 234.82K shares quarter on quarter, and down 1.79Mn shares year over year.
As of June 30, 2026, the biggest holder of TransMedics is BlackRock, Inc. at 5.6Mn shares, representing 16.18% of shares outstanding.
Top purchasers of TMDX stock for the quarter ending June 2026 included CITADEL ADVISORS LLC (497.22K), Sixth Street Partners Management Company, L.P. (328.67K), BlackRock, Inc. (303.22K), BRAIDWELL LP (280.32K), Tidal Investments LLC (251.2K).
The largest sellers of TransMedics for the quarter ending June 2026 were Invesco Ltd. (643.0K), UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC (541.27K), TWO SIGMA INVESTMENTS, LP (316.2K), Goldman Sachs Group Inc (306.51K), PRICE T ROWE ASSOCIATES INC /MD/ (300.66K).
Per Business Quant data, the top 10 holders of TransMedics for the quarter ending June 2026 are BlackRock, Inc. (5.6Mn), FMR LLC (5.13Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.93Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.5Mn), State Street Corp (1.42Mn), NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (910.5K), GEODE CAPITAL MANAGEMENT, LLC (894.91K), Hood River Capital Management LLC (751.13K), DIMENSIONAL FUND ADVISORS LP (610.11K), BRAIDWELL LP (609.72K).

Form 13F Holdings

376 Institutional Holders

Report period 30 Jun, 2026

Total shares held 34.80Mn

Of outstanding 100.65%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	5,596,549	16.18%	▲303,218	+5.73%	$371.72Mn
2	FMR LLC	0000315066	5,133,328	14.84%	▲37,085	+0.73%	$340.96Mn
3	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	1,933,989	5.59%	▲14,454	+0.75%	$128.46Mn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	1,497,600	4.33%	▲19,448	+1.32%	$99.47Mn
5	State Street Corp	0000093751	1,420,421	4.11%	▲100,942	+7.65%	$94.34Mn
6	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	0000921739	910,495	2.63%	▲24,654	+2.78%	$60.48Mn
7	GEODE CAPITAL MANAGEMENT, LLC	0001214717	894,913	2.59%	▲55,758	+6.64%	$59.45Mn
8	Hood River Capital Management LLC	0001578177	751,133	2.17%	▲51,363	+7.34%	$49.89Mn
9	DIMENSIONAL FUND ADVISORS LP	0000354204	610,107	1.76%	▲93,428	+18.08%	$40.53Mn
10	BRAIDWELL LP	0001920938	609,715	1.76%	▲280,324	+85.10%	$40.50Mn
11	Goldman Sachs Group Inc	0000886982	559,771	1.62%	▼306,511	-35.38%	$37.18Mn
12	CITADEL ADVISORS LLC	0001423053	558,824	1.62%	▲497,223	+807.17%	$37.12Mn
13	EVENTIDE ASSET MANAGEMENT, LLC	0001442891	548,874	1.59%	▲50	+0.01%	$36.46Mn
14	WELLINGTON MANAGEMENT GROUP LLP	0000902219	515,973	1.49%	▲29,500	+6.06%	$34.27Mn
15	EMERALD ADVISERS, LLC	0001015083	490,491	1.42%	▲147,700	+43.09%	$32.58Mn
16	UBS Group AG	0001610520	488,058	1.41%	▼92,735	-15.97%	$32.42Mn
17	Morgan Stanley	0000895421	405,112	1.17%	▼289,038	-41.64%	$26.91Mn
18	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0000861177	398,250	1.15%	▼541,273	-57.61%	$26.45Mn
19	Invesco Ltd.	0000914208	394,979	1.14%	▼642,995	-61.95%	$26.23Mn
20	Citigroup Inc	0000831001	386,066	1.12%	▲28,685	+8.03%	$25.64Mn

Showing 1 to 20 of 376 holders