$TMDX

$69.70 -$0.93 (1.32%) Live

$TMDX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 34.7M shares outstanding

Who owns TMDX?

By type of holder

Institutions 98.7% Insiders 1.3% Everyone else 0.0%

Concentration Top 10 holders own 57.0%

BlackRock, Inc. 16.1% · FMR LLC 14.8%

Institutional ownership

98.7%

-1.3 pts vs last qtr

Institutional holders

372

-42 vs last qtr

Net shares bought

−2.0M

by institutions in Q2 2026

New / sold out

69 / 111

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Citadel Advisors LLC +497.2K
BlackRock, Inc. +303.2K

Biggest sellers in Q2 2026

Invesco Ltd. −643.0K
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC −541.3K

Who is planning to sell?

Notices of proposed sale, last 12 months

$3.62M

6 notices from 5 people

Shares covered

29.6K

0.09% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

David Weill Director $1.22M
Gerardo P Hernandez Officer $1.07M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+64.1%

+10.42% a year

Each share's claim on the business

−39.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $109M

over 6 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years69% 3–5 years4% 1–3 years17% Under 1 year10%

Quarterly turnover

13.6%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting TMDX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	5.6M	16.14%	+303.2K (+5.7%)	≤2021	0.0%
Shares held by quarter Peak holding5.6M (Q2'26) Change over 8 quarters+288.8K Share of the company16.140% BlackRock, Inc.'s full portfolio →
F FMR LLC	5.1M	14.80%	+37.1K (+0.7%)	≤2021	0.0%
Shares held by quarter Peak holding5.1M (Q2'26) Change over 8 quarters+3.0M Share of the company14.800% FMR LLC's full portfolio →

BlackRock, Inc.

5.6M

% of company

16.14%

Change vs last qtr

+303.2K (+5.7%)

Held since

≤2021

FMR LLC

5.1M

% of company

14.80%

Change vs last qtr

+37.1K (+0.7%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding TransMedics Group, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting TMDX on Form N-PORT; together they hold 59.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$138M	2.1M	6.01%	0.12%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$69M	1.0M	3.00%	0.00%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$138M

% of company

6.01%

% of the fund

0.12%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$69M

% of company

3.00%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding TransMedics Group, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
KE Kania Edwin M JR Insider	1.6M	4.60%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company4.600% Kania Edwin M JR's insider activity →
HW Hassanein Waleed H Insider	666.1K	1.92%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.920% Hassanein Waleed H's insider activity →

Kania Edwin M JR

Insider

1.6M

% of company

4.60%

Change vs last qtr

—

Held since

—

Hassanein Waleed H

Insider

666.1K

% of company

1.92%

Change vs last qtr

—

Held since

—

12 more holders behind a free account

See every insider and 5%+ holder of TransMedics Group, Inc..

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