Institutional shares held 81.1 Million
2.87M calls
134K puts
Total value of holdings $901M
$31.9M calls
$1.49M puts
Market Cap $713M
64,221,200 Shares Out.
Institutional ownership 126.26%
# of Institutions 302


Latest Institutional Activity in TNDM

Top Purchases

Q2 2025
Ophir Asset Management Pty LTD Shares Held: 1.46M ($16.3M)
Q2 2025
Goldman Sachs Group Inc Shares Held: 1.89M ($21M)
Q2 2025
Millennium Management LLC Shares Held: 969K ($10.8M)
Q2 2025
Two Sigma Investments, LP Shares Held: 1.23M ($13.7M)
Q2 2025
Walleye Capital LLC Shares Held: 567K ($6.3M)

Top Sells

Q2 2025
Fred Alger Management, LLC Shares Held: 667K ($7.41M)
Q2 2025
Balyasny Asset Management LLC Shares Held: 231K ($2.57M)
Q2 2025
Soleus Capital Management, L.P. Shares Held: 200K ($2.22M)
Q2 2025
Beaconlight Capital, LLC Shares Held: 53.5K ($594K)
Q2 2025
Tudor Investment Corp Et Al Shares Held: 312K ($3.46M)

About TNDM

Tandem Diabetes Care, Inc., a medical device company, designs, develops, and commercializes various products for people with insulin-dependent diabetes in the United States and internationally. The company's flagship product is the t:slim X2 insulin delivery system, a pump platform that comprises t:slim X2 pump, its 300-unit disposable insulin cartridge, and an infusion set. It also provides t:slim X2 insulin with Basal-IQ and control IQ technology; t:slim X2 with G5 Integration; and Tandem Device Updater, a tool that allows users to update their pump's software. In addition, the company offers t:connect, a web-based data management application, which provides a visual way to display diabetes therapy management data from the pump, continuous glucose monitoring, and supported blood glucose meters for users, their caregivers, and their healthcare providers; and Sugarmate, a mobile app for people with diabetes who use insulin. It has development and commercialization agreements with Dexcom, Inc. and Abbott Laboratories. The company was formerly known as Phluid Inc. and changed its name to Tandem Diabetes Care, Inc. in January 2008. Tandem Diabetes Care, Inc. was incorporated in 2006 and is headquartered in San Diego, California.


Insider Transactions at TNDM

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
337K Shares
From 29 Insiders
Exercise of conversion of derivative security 282K shares
Grant, award, or other acquisition 9.41K shares
Other acquisition or disposition 11.2K shares
Open market or private purchase 34.8K shares
Sell / Disposition
154K Shares
From 11 Insiders
Payment of exercise price or tax liability 101K shares
Other acquisition or disposition 11.2K shares
Bona fide gift 1K shares
Open market or private sale 40K shares

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