TransMedics Group, Inc. (TMDX) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

36,846,970Shares Outstanding

868,847Shares held by institutions

$116,269,106Value of institutional holdings

95.89%Institutional ownership %

2.05%Shares Changed QoQ

398No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 398 institutions have reported a stake in TransMedics Group, Inc. (NASDAQ:TMDX) as of December 2025, according to recent 13F filings with the SEC.

Institutional ownership in TransMedics edged down to 95.9% in December 2025, compared to 102.1% in September 2025.
In percentage terms, this reflects as a holdings change of 2.05% quarter on quarter, and an increase of 29.64% year over year.
Of these 398 institutional investors, 224 increased their holdings in TransMedics, while 120 of them reduced positions, and 54 investors maintained their exposure.
The aggregate institutional position in TransMedics now stands at 35.33Mn shares as of December 2025, after investors increased their holdings (up by 709.56K shares quarter on quarter which is down 1.44Mn shares year over year).
As of December 31, 2025, BlackRock, Inc. held TransMedics's largest shareholding position with over 5.40Mn shares, representing 14.64% of total outstanding shares.
Among the most significant buyers of TransMedics during December 2025 were NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (832.24K), WELLINGTON MANAGEMENT GROUP LLP (217.18K), GOLDMAN SACHS GROUP INC (202.35K), MORGAN STANLEY (119.94K), Candriam S.C.A. (109.19K).
Leading sellers of TransMedics stock in December 2025 included MARSHALL WACE, LLP (351.21K), TWO SIGMA INVESTMENTS, LP (199.43K), UBS Group AG (196.77K), JANE STREET GROUP, LLC (185.66K), BROWN CAPITAL MANAGEMENT LLC (167.94K).
The top 10 institutional holders of TransMedics for the quarter ending December 2025 included BlackRock, Inc. (5.40Mn), FMR LLC (5.08Mn), VANGUARD GROUP INC (3.61Mn), STATE STREET CORP (1.28Mn), UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC (996.88K), GOLDMAN SACHS GROUP INC (965.93K), NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (832.24K), GEODE CAPITAL MANAGEMENT, LLC (816.47K), DRIEHAUS CAPITAL MANAGEMENT LLC (712.04K), Hood River Capital Management LLC (690.36K).

398 Institutional Holders

868,847 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	5,395,232	63,634	1.19%	$656,329,974.00
FMR LLC	31 Dec, 2025	5,077,036	12,666	0.25%	$617,621,412.00
VANGUARD GROUP INC	31 Dec, 2025	3,605,279	-328	-0.01%	$438,582,190.00
STATE STREET CORP	31 Dec, 2025	1,275,133	-4,408	-0.34%	$155,119,929.00
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	31 Dec, 2025	996,878	-72,614	-6.79%	$121,270,211.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	965,931	202,353	26.50%	$117,505,506.00
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	31 Dec, 2025	832,241	832,241	0.00%	$101,242,000.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	816,474	2,903	0.36%	$99,339,491.00
DRIEHAUS CAPITAL MANAGEMENT LLC	31 Dec, 2025	712,041	-26,117	-3.54%	$86,619,788.00
Hood River Capital Management LLC	31 Dec, 2025	690,357	11,920	1.76%	$83,981,929.00
MORGAN STANLEY	31 Dec, 2025	667,761	119,942	21.89%	$81,233,295.00
UBS Group AG	31 Dec, 2025	659,296	-196,767	-22.99%	$80,203,359.00
EVENTIDE ASSET MANAGEMENT, LLC	31 Dec, 2025	548,267	971	0.18%	$66,698,201.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	489,710	38,717	8.58%	$59,573,649.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	435,969	-199,425	-31.39%	$53,035,629.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	433,321	217,180	100.48%	$52,713,499.00
JPMORGAN CHASE & CO	31 Dec, 2025	375,261	-17,095	-4.36%	$45,650,501.00
TWO SIGMA ADVISERS, LP	31 Dec, 2025	362,300	-61,000	-14.41%	$44,073,795.00
EMERALD ADVISERS, LLC	31 Dec, 2025	351,349	-36,239	-9.35%	$42,741,606.00
NORTHERN TRUST CORP	31 Dec, 2025	339,216	-8,253	-2.38%	$41,265,627.00

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