Tandem Diabetes Care Inc. Insider Trading

TNDM

Last 12 months

Insiders sold 37K and bought nothing on the open market.

All of the selling was scheduled in advance under 10b5-1 plans. The last open-market buy by an executive or director was in Aug 2025.

Net open-market

−37K

0 buys · 3 sales

Under a 10b5-1 plan

100%

of the value sold

Insiders who bought / sold

0 / 2

executives and directors

Last open-market buy

Aug 2025

Aug 11, 2025

Get an email when TNDM's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 27	Christopher J Twomey Director	Sold10b5-1 plan	1,700	$19.15	33K	4.4%	Form 4
Mar 17	Mark David Novara EVP & Chief Commercial Officer	Sold10b5-1 plan	187	$23.05	4K	0.5%	Form 4
Mar 5	Mark David Novara EVP & Chief Commercial Officer	Sold10b5-1 plan	2	$22.81	$46	<0.1%	Form 4
Aug 11, 2025	John F Sheridan President & CEO	Bought	10,000	$10.23	102K	10%	Form 4
Aug 8, 2025	Leigh Vosseller EVP & Chief Financial Officer	Bought	13,720	$10.89	149K	30%	Form 4
Mar 7, 2025	Jean-Claude Kyrillos EVP & Chief Operating Officer	Bought	10,538	$18.12	191K	New	Form 4
Nov 20, 2024 – Nov 21, 2024	Kim D Blickenstaff Director	SoldNo plan 2 parts	40,000	$31.04 average	$1.24M	19%	Form 4
Nov 15, 2024	Mark David Novara EVP & Chief Commercial Officer	Bought	532	$23.24	12K	New	Form 4

Oct 2710b5-1 plan
Christopher J Twomey
Director · sold 1,700 at $19.15
33K
4.4% of stake
Mar 1710b5-1 plan
Mark David Novara
EVP & Chief Commercial Officer · sold 187 at $23.05
4K
0.5% of stake
Mar 510b5-1 plan
Mark David Novara
EVP & Chief Commercial Officer · sold 2 at $22.81
$46
<0.1% of stake
Aug 11, 2025
John F Sheridan
President & CEO · bought 10,000 at $10.23
102K
10% of stake
Aug 8, 2025
Leigh Vosseller
EVP & Chief Financial Officer · bought 13,720 at $10.89
149K
30% of stake
Mar 7, 2025
Jean-Claude Kyrillos
EVP & Chief Operating Officer · bought 10,538 at $18.12
191K
New position
Nov 20, 2024 – Nov 21, 2024No plan
Kim D Blickenstaff
Director · sold 40,000 at avg $31.04
$1.24M
19% of stake
Nov 15, 2024
Mark David Novara
EVP & Chief Commercial Officer · bought 532 at $23.24
12K
New position

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch TNDM, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Held by ETFs

TNDM is in 49 US ETFs. The largest of them, with TNDM's weight in each:

Spot a number that looks wrong? Check it in TNDM's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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