Tandem Diabetes Care Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGM:TNDM Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
11 Aug 25	BuyUS$102,318	John Sheridan	Individual	10,000	US$10.23
08 Aug 25	BuyUS$149,404	Leigh Vosseller	Individual	13,720	US$10.89
07 Mar 25	BuyUS$190,966	Jean-Claude Kyrillos	Individual	10,538	US$18.12
21 Nov 24	SellUS$1,241,400	Kim Blickenstaff	Individual	40,000	US$31.38
15 Nov 24	BuyUS$12,364	Mark Novara	Individual	532	US$23.24

Insider Trading Volume

Insider Buying: TNDM insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of TNDM?
Owner Type	Number of Shares	Ownership Percentage
State or Government	36,189	0.0438%
Individual Insiders	707,089	0.856%
Hedge Funds	5,000,000	6.05%
Institutions	76,898,624	93.1%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 83.93% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
16.1%	BlackRock, Inc.	10,871,194	US$136.8m	-1.43%	no data
10.9%	The Vanguard Group, Inc.	7,369,830	US$92.7m	1.06%	no data
7.4%	Sessa Capital IM, L.P.	5,000,000	US$62.9m	12%	1.76%
4.28%	GW&K Investment Management, LLC	2,890,130	US$36.4m	0.91%	0.29%
4%	ArrowMark Colorado Holdings, LLC	2,699,549	US$34.0m	-0.62%	0.6%
3.92%	State Street Global Advisors, Inc.	2,645,889	US$33.3m	-1.56%	no data
3.8%	Hood River Capital Management LLC	2,564,978	US$32.3m	10.9%	0.4%
2.62%	Paradice Investment Management Pty Ltd.	1,767,179	US$22.2m	7.11%	0.85%
2.57%	Stephens Investment Management Group, LLC	1,737,769	US$21.9m	1.81%	0.28%
2.46%	Jennison Associates LLC	1,658,942	US$20.9m	12.3%	0.01%
2.45%	UBS Asset Management AG	1,652,847	US$20.8m	60.5%	no data
2.38%	Geode Capital Management, LLC	1,606,336	US$20.2m	3.15%	no data
2.17%	Ophir Asset Management Pty Ltd	1,464,956	US$18.4m	0%	2.23%
2.15%	Champlain Investment Partners, LLC	1,455,123	US$18.3m	6.3%	0.13%
2.12%	Jacobs Levy Equity Management Inc	1,431,307	US$18.0m	-2.74%	0.07%
2.03%	Goldman Sachs Group, Investment Banking and Securities Investments	1,369,322	US$17.2m	160%	0.01%
1.82%	Two Sigma Investments, LP	1,232,727	US$15.5m	92.2%	0.03%
1.67%	Baillie Gifford & Co.	1,125,728	US$14.2m	53.7%	0.01%
1.56%	Brown Advisory Incorporated	1,056,488	US$13.3m	14.2%	0.02%
1.49%	Morgan Stanley, Investment Banking and Brokerage Investments	1,005,091	US$12.6m	53.3%	no data
1.43%	Millennium Management LLC	969,073	US$12.2m	326%	0.01%
1.31%	Two Sigma Advisers, LP	888,083	US$11.2m	30.7%	0.02%
1.16%	Connor, Clark & Lunn Investment Management Ltd.	784,218	US$9.9m	21.6%	0.03%
1.14%	Capital Research and Management Company	767,000	US$9.6m	0%	no data
1.04%	Northern Trust Global Investments	700,381	US$8.8m	1.57%	no data

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/09/08 18:20
End of Day Share Price	2025/09/08 00:00
Earnings	2025/06/30
Annual Earnings	2024/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

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Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Tandem Diabetes Care, Inc. is covered by 43 analysts. 22 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Jeffrey Johnson	Baird
Travis Steed	Barclays
Matthew Miksic	Barclays