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TNDM Insider Trading

Insider Ownership Percentage: 1.90%
Insider Buying (Last 12 Months): $442,659.36
Insider Selling (Last 12 Months): $0.00

Tandem Diabetes Care Insider Trading History Chart

This chart shows the insider buying and selling history at Tandem Diabetes Care by year and by quarter.

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Tandem Diabetes Care Share Price & Price History

Current Price: $20.71
Price Change: ▲ Price Increase of +0.78 (3.91%)
As of 12/4/2025 05:00 PM ET

This chart shows the closing price history over time for TNDM up to the past year.

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Days: 30 | 90 | 365

Tandem Diabetes Care Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
8/11/2025John F. SheridanCEOBuy10,000$10.23$102,300.00106,327View SEC Filing Icon  
8/8/2025Leigh VossellerCFOBuy13,720$10.89$149,410.8025,580View SEC Filing Icon  
3/7/2025Jean-Claude KyrillosCOOBuy10,538$18.12$190,948.5610,538View SEC Filing Icon  
11/20/2024Kim D. BlickenstaffDirectorSell10,000$30.00$300,000.00195,190View SEC Filing Icon  
11/20/2024Kim D. BlickenstaffDirectorSell10,000$30.00$300,000.00195,190View SEC Filing Icon  
11/15/2024Mark David NovaraEVPBuy532$23.24$12,363.68532View SEC Filing Icon  
5/30/2024Dick AllenDirectorSell5,000$51.68$258,400.0024,396View SEC Filing Icon  
11/27/2023Dick AllenDirectorBuy5,000$18.96$94,800.0019,962View SEC Filing Icon  
11/8/2023Leigh VossellerCFOBuy6,200$15.39$95,418.0011,860View SEC Filing Icon  
11/8/2023Shannon Marie HansenInsiderBuy1,935$15.44$29,876.401,935View SEC Filing Icon  
9/15/2023Kathleen McGroddy-GoetzDirectorBuy1,000$21.45$21,450.009,032View SEC Filing Icon  
5/18/2023Dick AllenDirectorBuy10,000$29.47$294,700.0012,205View SEC Filing Icon  
5/12/2023Leigh VossellerCFOBuy3,015$32.77$98,801.555,660View SEC Filing Icon  
3/3/2023David B. BergerCOOSell10,000$41.19$411,900.003,365View SEC Filing Icon  
12/16/2022David B. BergerCOOSell10,000$40.25$402,500.003,029View SEC Filing Icon  
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SEC Filings (Institutional Ownership Changes) for Tandem Diabetes Care (NASDAQ:TNDM)

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at TNDM by year and by quarter.

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Tandem Diabetes Care Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
11/19/2025Caitong International Asset Management Co. Ltd2,205$27K0.0%+200.0%0.003%Search for SEC Filing on Google Icon
11/18/2025Advisory Services Network LLC8,274$100K0.0%-27.8%0.012%Search for SEC Filing on Google Icon
11/17/2025Jacobs Levy Equity Management Inc.1,481,953$17.99M0.1%+3.5%2.186%Search for SEC Filing on Google Icon
11/17/2025Dark Forest Capital Management LP75,535$0.92M0.0%+23.8%0.111%Search for SEC Filing on Google Icon
11/17/2025PharVision Advisers LLC22,268$0.27M0.2%N/A0.033%Search for SEC Filing on Google Icon
11/17/2025XTX Topco Ltd73,545$0.89M0.0%+291.3%0.108%Search for SEC Filing on Google Icon
11/17/2025Verition Fund Management LLC23,066$0.28M0.0%-89.4%0.034%Search for SEC Filing on Google Icon
11/17/2025Quarry LP3,695$45K0.0%+2,597.1%0.005%Search for SEC Filing on Google Icon
11/17/2025Prelude Capital Management LLC18,754$0.23M0.0%N/A0.028%Search for SEC Filing on Google Icon
11/17/2025Mariner LLC24,803$0.30M0.0%+39.8%0.037%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC705,902$8.57M0.0%-27.2%1.041%Search for SEC Filing on Google Icon
11/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.62,698$0.76M0.0%-1.5%0.092%Search for SEC Filing on Google Icon
11/17/2025Moore Capital Management LP220,479$2.68M0.0%+269.2%0.325%Search for SEC Filing on Google Icon
11/17/2025Brevan Howard Capital Management LP126,888$1.54M0.0%+33.9%0.187%Search for SEC Filing on Google Icon
11/17/2025ArrowMark Colorado Holdings LLC3,691,198$44.81M0.8%+36.7%5.444%Search for SEC Filing on Google Icon
11/17/2025Algert Global LLC226,886$2.75M0.0%-57.3%0.335%Search for SEC Filing on Google Icon
11/17/2025Alliancebernstein L.P.223,720$2.72M0.0%-17.2%0.330%Search for SEC Filing on Google Icon
11/17/2025Ameriprise Financial Inc.168,730$2.05M0.0%-59.7%0.249%Search for SEC Filing on Google Icon
11/14/2025Schonfeld Strategic Advisors LLC142,855$1.73M0.0%-28.5%0.211%Search for SEC Filing on Google Icon
11/14/2025Raymond James Financial Inc.136,926$1.66M0.0%-4.4%0.202%Search for SEC Filing on Google Icon
11/14/2025Freestone Grove Partners LP1,870,307$22.71M0.2%N/A2.758%Search for SEC Filing on Google Icon
11/14/2025UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC184,895$2.25M0.0%-31.2%0.273%Search for SEC Filing on Google Icon
11/14/2025Two Sigma Investments LP1,117,202$13.56M0.0%-9.4%1.648%Search for SEC Filing on Google Icon
11/14/2025Comerica Bank25,549$0.31M0.0%-13.6%0.038%Search for SEC Filing on Google Icon
11/13/2025Invesco Ltd.302,041$3.67M0.0%+33.2%0.445%Search for SEC Filing on Google Icon
11/13/2025Sei Investments Co.215,984$2.62M0.0%+15.7%0.319%Search for SEC Filing on Google Icon
11/13/2025Capital Fund Management S.A.171,109$2.08M0.0%-34.8%0.252%Search for SEC Filing on Google Icon
11/13/2025BNP Paribas Financial Markets219,615$2.67M0.0%-97.8%0.324%Search for SEC Filing on Google Icon
11/13/2025Franklin Resources Inc.40,772$0.50M0.0%+51.3%0.060%Search for SEC Filing on Google Icon
11/13/2025Van ECK Associates Corp2,049$25K0.0%-68.7%0.003%Search for SEC Filing on Google Icon
11/13/2025Legal & General Group Plc182,432$2.22M0.0%-1.3%0.269%Search for SEC Filing on Google Icon
11/13/2025Russell Investments Group Ltd.137,672$1.67M0.0%-30.7%0.203%Search for SEC Filing on Google Icon
11/13/2025Natixis Advisors LLC56,404$0.69M0.0%+33.0%0.083%Search for SEC Filing on Google Icon
11/13/2025First Trust Advisors LP40,730$0.49M0.0%N/A0.060%Search for SEC Filing on Google Icon
11/12/2025Orion Porfolio Solutions LLC43,982$0.53M0.0%-1.4%0.065%Search for SEC Filing on Google Icon
11/12/2025GW&K Investment Management LLC2,721,649$33.04M0.3%-5.8%4.014%Search for SEC Filing on Google Icon
11/12/2025Teachers Retirement System of The State of Kentucky19,003$0.23M0.0%-10.7%0.028%Search for SEC Filing on Google Icon
11/12/2025Royce & Associates LP510,000$6.19M0.1%N/A0.752%Search for SEC Filing on Google Icon
11/12/2025Aster Capital Management DIFC Ltd5,149$63K0.0%+485.1%0.008%Search for SEC Filing on Google Icon
11/12/2025Intech Investment Management LLC73,493$0.89M0.0%+55.2%0.108%Search for SEC Filing on Google Icon
11/12/2025US Bancorp DE2,355$29K0.0%-93.3%0.003%Search for SEC Filing on Google Icon
11/10/2025Counterpoint Mutual Funds LLC42,265$0.51M0.0%N/A0.063%Search for SEC Filing on Google Icon
11/10/2025Ameritas Investment Partners Inc.5,586$68K0.0%-18.7%0.008%Search for SEC Filing on Google Icon
11/10/2025China Universal Asset Management Co. Ltd.8,000$97K0.0%N/A0.012%Search for SEC Filing on Google Icon
11/7/2025GSA Capital Partners LLP98,941$1.20M0.1%N/A0.146%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.7,063,314$85.75M0.0%-4.2%10.453%Search for SEC Filing on Google Icon
11/7/2025JPMorgan Chase & Co.359,071$4.36M0.0%-36.1%0.531%Search for SEC Filing on Google Icon
11/7/2025Shell Asset Management Co.3,878$47K0.0%-83.0%0.006%Search for SEC Filing on Google Icon
11/7/2025Aberdeen Group plc598,096$7.26M0.0%+67.9%0.885%Search for SEC Filing on Google Icon
11/6/2025Public Sector Pension Investment Board263,564$3.20M0.0%+16.1%0.390%Search for SEC Filing on Google Icon
11/6/2025Caprock Group LLC44,359$0.56M0.0%N/A0.066%Search for SEC Filing on Google Icon
11/6/2025Rhumbline Advisers190,184$2.31M0.0%-1.6%0.281%Search for SEC Filing on Google Icon
11/6/2025Versor Investments LP26,200$0.32M0.1%N/A0.039%Search for SEC Filing on Google Icon
11/6/2025Bryce Point Capital LLC42,258$0.51M0.6%N/A0.063%Search for SEC Filing on Google Icon
11/6/2025ProShare Advisors LLC12,606$0.15M0.0%-15.5%0.019%Search for SEC Filing on Google Icon
11/6/2025Oppenheimer Asset Management Inc.41,495$0.50M0.0%-23.2%0.061%Search for SEC Filing on Google Icon
11/5/2025Envestnet Asset Management Inc.236,332$2.87M0.0%-15.0%0.350%Search for SEC Filing on Google Icon
11/4/2025Brown Capital Management LLC363,352$4.41M0.2%-34.1%0.538%Search for SEC Filing on Google Icon
11/4/2025State of Wyoming15,043$0.18M0.0%-29.8%0.022%Search for SEC Filing on Google Icon
11/4/2025Principal Financial Group Inc.326,701$3.97M0.0%-17.3%0.484%Search for SEC Filing on Google Icon
11/3/2025AlphaQuest LLC22,910$0.28M0.0%+31.9%0.034%Search for SEC Filing on Google Icon
11/3/2025Truist Financial Corp115,576$1.40M0.0%-6.4%0.171%Search for SEC Filing on Google Icon
10/31/2025Sector Gamma AS269,542$3.27M0.8%+28.0%0.399%Search for SEC Filing on Google Icon
10/31/2025Y Intercept Hong Kong Ltd56,925$0.69M0.0%N/A0.084%Search for SEC Filing on Google Icon
10/31/2025Baillie Gifford & Co.1,120,595$13.60M0.0%-0.5%1.658%Search for SEC Filing on Google Icon
10/30/2025Olympiad Research LP16,623$0.20M0.3%N/A0.025%Search for SEC Filing on Google Icon
10/30/2025Universal Beteiligungs und Servicegesellschaft mbH98,310$1.19M0.0%-3.0%0.145%Search for SEC Filing on Google Icon
10/29/2025Mizuho Markets Americas LLC117,362$1.43M0.0%-15.4%0.174%Search for SEC Filing on Google Icon
10/29/2025Wealth Enhancement Advisory Services LLC15,082$0.18M0.0%N/A0.022%Search for SEC Filing on Google Icon
10/29/2025Amalgamated Bank19,617$0.24M0.0%+3.5%0.029%Search for SEC Filing on Google Icon
10/24/2025Bayforest Capital Ltd19,295$0.23M0.1%+108.1%0.029%Search for SEC Filing on Google Icon
10/24/2025State of Alaska Department of Revenue38,153$0.46M0.0%-3.8%0.056%Search for SEC Filing on Google Icon
10/23/2025SG Americas Securities LLC63,051$0.77M0.0%+127.1%0.093%Search for SEC Filing on Google Icon
10/22/2025CoreCap Advisors LLC4,751$58K0.0%+270.3%0.007%Search for SEC Filing on Google Icon
10/21/2025MN Wealth Advisors LLC17,430$0.21M0.1%N/A0.026%Search for SEC Filing on Google Icon
10/20/2025Diversified Trust Co18,339$0.22M0.0%+12.2%0.027%Search for SEC Filing on Google Icon
10/20/2025Paradice Investment Management LLC2,196,468$26.67M6.0%+24.3%3.251%Search for SEC Filing on Google Icon
10/16/2025180 Wealth Advisors LLC10,396$0.13M0.0%N/A0.015%Search for SEC Filing on Google Icon
10/16/2025Rice Hall James & Associates LLC102,569$1.25M0.1%-1.3%0.152%Search for SEC Filing on Google Icon
10/15/2025CWM LLC21,983$0.27M0.0%+686.2%0.033%Search for SEC Filing on Google Icon
10/15/2025Inspire Investing LLC38,419$0.47M0.0%+84.3%0.057%Search for SEC Filing on Google Icon
10/14/2025Yousif Capital Management LLC21,327$0.26M0.0%-15.2%0.032%Search for SEC Filing on Google Icon
10/9/2025Voya Investment Management LLC174,146$2.11M0.0%+26.4%0.258%Search for SEC Filing on Google Icon
10/1/2025Praxis Investment Management Inc.12,376$0.15M0.0%N/A0.018%Search for SEC Filing on Google Icon
8/27/2025Orion Porfolio Solutions LLC44,611$0.83M0.0%-5.3%0.066%Search for SEC Filing on Google Icon
8/27/2025Squarepoint Ops LLC180,660$3.37M0.0%+45.8%0.267%Search for SEC Filing on Google Icon
8/19/2025State of Wyoming21,436$0.40M0.0%+379.9%0.032%Search for SEC Filing on Google Icon
8/16/2025Public Sector Pension Investment Board227,104$4.23M0.0%+9.1%0.336%Search for SEC Filing on Google Icon
8/15/2025CANADA LIFE ASSURANCE Co56,332$1.05M0.0%+5.7%0.083%Search for SEC Filing on Google Icon
8/15/2025Tower Research Capital LLC TRC 9,168$0.17M0.0%+218.6%0.014%Search for SEC Filing on Google Icon
8/15/2025Corient Private Wealth LLC23,600$0.44M0.0%+109.4%0.035%Search for SEC Filing on Google Icon
8/15/2025State of Tennessee Department of Treasury36,189$0.68M0.0%+21.3%0.054%Search for SEC Filing on Google Icon
8/15/2025Captrust Financial Advisors24,766$0.46M0.0%+15.1%0.037%Search for SEC Filing on Google Icon
8/15/2025Soleus Capital Management L.P.200,000$3.73M0.2%-59.7%0.296%Search for SEC Filing on Google Icon
8/15/2025Orion Porfolio Solutions LLC44,611$0.83M0.0%-5.3%0.066%Search for SEC Filing on Google Icon
8/15/2025Moore Capital Management LP59,726$1.11M0.0%-42.8%0.088%Search for SEC Filing on Google Icon
8/15/2025Man Group plc74,886$1.40M0.0%+174.1%0.111%Search for SEC Filing on Google Icon
8/15/2025Engineers Gate Manager LP170,488$3.18M0.0%-10.7%0.252%Search for SEC Filing on Google Icon
8/15/2025Beaconlight Capital LLC53,455$1M0.6%-75.7%0.079%Search for SEC Filing on Google Icon
8/15/2025Brevan Howard Capital Management LP94,734$1.77M0.0%+778.9%0.140%Search for SEC Filing on Google Icon
Data available starting January 2016

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Tandem Diabetes Care logo
Tandem Diabetes Care, Inc., a medical device company, designs, develops, and commercializes technology solutions for people living with diabetes in the United States and internationally. The company's flagship product is the t:slim X2 insulin delivery system, a pump platform for managing insulin delivery and display continuous glucose monitoring sensor information directly on the pump home screen; and Tandem Mobi insulin pump, an automated insulin delivery system. It also sells single-use products, including cartridges for storing and delivering insulin, and infusion sets that connect the insulin pump to the user's body. In addition, the company offers Tandem Device Updater used to update the pump software from a personal computer; Tandem Source, a web-based data management platform, which provides a visual way to display diabetes therapy management data from the pumps, integrated CGMs, and supported blood glucose meters; and Sugarmate, a mobile app used to help people visualize diabetes therapy data. 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.
Read More on Tandem Diabetes Care

Today's Range

Now: $20.71
Low: $19.70
High: $20.77

50 Day Range

MA: $16.34
Low: $11.79
High: $21.84

52 Week Range

Now: $20.71
Low: $9.98
High: $38.28

Volume

1,211,304 shs

Average Volume

2,727,369 shs

Market Capitalization

$1.40 billion

P/E Ratio

N/A

Dividend Yield

N/A

Beta

1.68

Who are the company insiders with the largest holdings of Tandem Diabetes Care?

Tandem Diabetes Care's top insider investors include:
  1. Kim D Blickenstaff (Director)
  2. John F Sheridan (CEO)
  3. Leigh Vosseller (CFO)
  4. Dick Allen (Director)
  5. Jean-Claude Kyrillos (COO)
  6. Mark David Novara (EVP)
Learn More about top insider investors at Tandem Diabetes Care.

Who are the major institutional investors of Tandem Diabetes Care?

Tandem Diabetes Care's top institutional investors include:
  1. Vanguard Group Inc. — 10.45%
  2. ArrowMark Colorado Holdings LLC — 5.44%
  3. GW&K Investment Management LLC — 4.01%
  4. Paradice Investment Management LLC — 3.25%
  5. Freestone Grove Partners LP — 2.76%
  6. Jacobs Levy Equity Management Inc. — 2.19%
Learn More about top institutional investors of Tandem Diabetes Care stock.

Which institutional investors are selling Tandem Diabetes Care stock?

In the last quarter, TNDM stock was sold by these institutional investors:
  1. BNP Paribas Financial Markets
  2. Vanguard Group Inc.
  3. Algert Global LLC
  4. Millennium Management LLC
  5. Ameriprise Financial Inc.
  6. JPMorgan Chase & Co.
  7. Verition Fund Management LLC
  8. Brown Capital Management LLC

Which institutional investors are buying Tandem Diabetes Care stock?

In the last quarter, TNDM stock was purchased by institutional investors including:
  1. Freestone Grove Partners LP
  2. ArrowMark Colorado Holdings LLC
  3. Royce & Associates LP
  4. Paradice Investment Management LLC
  5. Aberdeen Group plc
  6. Moore Capital Management LP
  7. GSA Capital Partners LLP
  8. Susquehanna International Group LLP
Within the last year, these company insiders have bought Tandem Diabetes Care stock:
  1. Kim D Blickenstaff (Director)
  2. John F Sheridan (CEO)
  3. Leigh Vosseller (CFO)
  4. Dick Allen (Director)
Learn More investors buying Tandem Diabetes Care stock.