Institutional shares held 74.1 Million
2.94M calls
362K puts
Total value of holdings $1.38B
$54.7M calls
$6.73M puts
Market Cap $1.2B
64,221,200 Shares Out.
Institutional ownership 115.36%
# of Institutions 287


Latest Institutional Activity in TNDM

Top Purchases

Q3 2025
Freestone Grove Partners LP Shares Held: 1.87M ($34.8M)
Q3 2025
Arrow Mark Colorado Holdings LLC Shares Held: 3.69M ($68.7M)
Q3 2025
Barclays PLC Shares Held: 1.19M ($22.1M)
Q3 2025
Acadian Asset Management LLC Shares Held: 919K ($17.1M)
Q3 2025
D. E. Shaw & Co., Inc. Shares Held: 877K ($16.3M)

Top Sells

Q3 2025
Morgan Stanley Shares Held: 738K ($13.7M)
Q3 2025
Goldman Sachs Group Inc Shares Held: 1.43M ($26.6M)
Q3 2025
Prudential Financial Inc Shares Held: 69.4K ($1.29M)
Q3 2025
Citadel Advisors LLC Shares Held: 39.8K ($741K)
Q3 2025
Vanguard Group Inc Shares Held: 7.06M ($131M)

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
356K Shares
From 28 Insiders
Exercise of conversion of derivative security 299K shares
Grant, award, or other acquisition 9.17K shares
Other acquisition or disposition 14.2K shares
Open market or private purchase 34.3K shares
Sell / Disposition
125K Shares
From 10 Insiders
Payment of exercise price or tax liability 110K shares
Other acquisition or disposition 14.2K shares
Bona fide gift 1K shares

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