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TNDM Insider Trading

Insider Ownership Percentage: 1.90%
Insider Buying (Last 12 Months): $251,710.80
Insider Selling (Last 12 Months): $4,355.97

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: $23.39
Price Change: ▼ Price Decrease of -0.874 (-3.60%)
As of 03/26/2026 12:13 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
3/17/2026Mark David NovaraEVPSell187$23.05$4,310.3537,656View SEC Filing Icon  
3/5/2026Mark David NovaraEVPSell2$22.81$45.6235,969View SEC Filing Icon  
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  
See Full Table

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
3/20/2026Hsbc Holdings PLC36,553$0.81M0.0%-60.7%0.053%Search for SEC Filing on Google Icon
3/9/2026Corient Private Wealth LLC19,535$0.43M0.0%N/A0.029%Search for SEC Filing on Google Icon
2/19/2026Invesco Ltd.277,722$6.10M0.0%-8.1%0.410%Search for SEC Filing on Google Icon
2/19/2026Corient Private Wealth LLC15,748$0.35M0.0%N/A0.023%Search for SEC Filing on Google Icon
2/18/2026Mercer Global Advisors Inc. ADV11,294$0.25M0.0%N/A0.017%Search for SEC Filing on Google Icon
2/18/2026State of Tennessee Department of Treasury21,514$0.47M0.0%-33.4%0.032%Search for SEC Filing on Google Icon
2/18/2026EP Wealth Advisors LLC9,977$0.22M0.0%N/A0.015%Search for SEC Filing on Google Icon
2/18/2026Wellington Management Group LLP98,309$2.16M0.0%N/A0.145%Search for SEC Filing on Google Icon
2/18/2026Susquehanna Portfolio Strategies LLC66,452$1.46M0.0%-67.8%0.098%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC583,573$12.83M0.0%-17.3%0.861%Search for SEC Filing on Google Icon
2/18/2026Man Group plc12,782$0.28M0.0%N/A0.019%Search for SEC Filing on Google Icon
2/18/2026Inspire Investing LLC21,066$0.46M0.0%-45.2%0.031%Search for SEC Filing on Google Icon
2/18/2026Engineers Gate Manager LP88,547$1.95M0.0%N/A0.131%Search for SEC Filing on Google Icon
2/18/2026Balyasny Asset Management L.P.262,788$5.78M0.0%N/A0.388%Search for SEC Filing on Google Icon
2/17/2026Freestone Grove Partners LP1,442,836$31.71M0.2%-22.9%2.128%Search for SEC Filing on Google Icon
2/17/2026Schonfeld Strategic Advisors LLC14,590$0.32M0.0%-89.8%0.022%Search for SEC Filing on Google Icon
2/17/2026PDT Partners LLC110,385$2.43M0.2%-35.2%0.163%Search for SEC Filing on Google Icon
2/17/2026AQR Capital Management LLC339,579$7.46M0.0%-18.2%0.501%Search for SEC Filing on Google Icon
2/17/2026Cetera Investment Advisers10,937$0.24M0.0%-21.5%0.016%Search for SEC Filing on Google Icon
2/17/2026First Light Asset Management LLC1,089,493$23.95M1.8%N/A1.607%Search for SEC Filing on Google Icon
2/17/2026ArrowMark Colorado Holdings LLC2,889,691$63.52M1.4%-21.7%4.262%Search for SEC Filing on Google Icon
2/17/2026Trexquant Investment LP102,719$2.26M0.0%-79.4%0.151%Search for SEC Filing on Google Icon
2/17/2026Amundi29,445$0.65M0.0%+167.1%0.043%Search for SEC Filing on Google Icon
2/17/2026Price T Rowe Associates Inc. MD56,809$1.25M0.0%-13.7%0.084%Search for SEC Filing on Google Icon
2/17/2026Adage Capital Partners GP L.L.C.182,995$4.02M0.0%N/A0.270%Search for SEC Filing on Google Icon
2/17/2026California State Teachers Retirement System64,411$1.42M0.0%+6.3%0.095%Search for SEC Filing on Google Icon
2/17/2026Russell Investments Group Ltd.128,660$2.83M0.0%-6.5%0.190%Search for SEC Filing on Google Icon
2/17/2026Maryland State Retirement & Pension System9,855$0.22M0.0%N/A0.015%Search for SEC Filing on Google Icon
2/17/2026State of Wisconsin Investment Board43,090$0.95M0.0%-33.4%0.064%Search for SEC Filing on Google Icon
2/17/2026Captrust Financial Advisors13,111$0.29M0.0%+7.0%0.019%Search for SEC Filing on Google Icon
2/17/2026Royal Bank of Canada208,528$4.58M0.0%-69.4%0.308%Search for SEC Filing on Google Icon
2/17/2026Rice Hall James & Associates LLC62,415$1.37M0.1%-39.1%0.092%Search for SEC Filing on Google Icon
2/16/2026Verition Fund Management LLC10,587$0.23M0.0%-54.1%0.016%Search for SEC Filing on Google Icon
2/16/2026Panagora Asset Management Inc.146,234$3.21M0.0%-25.1%0.216%Search for SEC Filing on Google Icon
2/16/2026Mariner LLC35,529$0.78M0.0%+43.2%0.052%Search for SEC Filing on Google Icon
2/13/2026Marshall Wace LLP875,531$19.24M0.0%N/A1.291%Search for SEC Filing on Google Icon
2/13/2026The Manufacturers Life Insurance Company 29,720$0.65M0.0%-6.0%0.044%Search for SEC Filing on Google Icon
2/13/2026Formula Growth Ltd.70,919$1.56M0.6%-41.9%0.105%Search for SEC Filing on Google Icon
2/13/2026Stifel Financial Corp27,485$0.60M0.0%-29.6%0.041%Search for SEC Filing on Google Icon
2/13/2026Quarry LP1,437$32K0.0%-61.1%0.002%Search for SEC Filing on Google Icon
2/13/2026Smartleaf Asset Management LLC1,330$30K0.0%+80.5%0.002%Search for SEC Filing on Google Icon
2/13/2026Jacobs Levy Equity Management Inc.1,653,708$36.35M0.1%+11.6%2.439%Search for SEC Filing on Google Icon
2/13/2026Public Sector Pension Investment Board234,673$5.16M0.0%-11.0%0.346%Search for SEC Filing on Google Icon
2/13/2026Nierenberg Investment Management Company LLC44,555$0.98M0.5%N/A0.066%Search for SEC Filing on Google Icon
2/13/2026Charles Schwab Investment Management Inc.646,310$14.21M0.0%+15.7%0.953%Search for SEC Filing on Google Icon
2/13/2026State Street Corp2,641,724$58.07M0.0%-1.0%3.896%Search for SEC Filing on Google Icon
2/13/2026Van ECK Associates Corp3,430$75K0.0%+67.4%0.005%Search for SEC Filing on Google Icon
2/13/2026Ieq Capital LLC27,178$0.60M0.0%N/A0.040%Search for SEC Filing on Google Icon
2/13/2026Caitong International Asset Management Co. Ltd1,321$29K0.1%-40.1%0.002%Search for SEC Filing on Google Icon
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC164,902$3.63M0.0%-10.8%0.243%Search for SEC Filing on Google Icon
2/13/2026Wells Fargo & Company MN84,411$1.86M0.0%+61.8%0.125%Search for SEC Filing on Google Icon
2/12/2026Advisors Asset Management Inc.23,776$0.52M0.0%-2.2%0.035%Search for SEC Filing on Google Icon
2/12/2026Orion Porfolio Solutions LLC40,579$0.89M0.0%-7.7%0.060%Search for SEC Filing on Google Icon
2/12/2026Counterpoint Mutual Funds LLC22,858$0.50M0.0%-45.9%0.034%Search for SEC Filing on Google Icon
2/12/2026EntryPoint Capital LLC9,477$0.21M0.1%N/A0.014%Search for SEC Filing on Google Icon
2/12/2026Ensign Peak Advisors Inc5,032$0.11M0.0%-70.7%0.007%Search for SEC Filing on Google Icon
2/12/2026Sector Gamma AS267,091$5.87M1.3%-0.9%0.394%Search for SEC Filing on Google Icon
2/12/2026Swiss National Bank133,300$2.93M0.0%+3.3%0.197%Search for SEC Filing on Google Icon
2/11/2026Deutsche Bank AG54,230$1.19M0.0%-1.0%0.080%Search for SEC Filing on Google Icon
2/11/2026GW&K Investment Management LLC2,675,157$58.80M0.5%-1.7%3.946%Search for SEC Filing on Google Icon
2/11/2026Fox Run Management L.L.C.11,398$0.25M0.0%N/A0.017%Search for SEC Filing on Google Icon
2/11/2026LPL Financial LLC39,590$0.87M0.0%+1.8%0.058%Search for SEC Filing on Google Icon
2/11/2026Franklin Resources Inc.27,897$0.61M0.0%-31.6%0.041%Search for SEC Filing on Google Icon
2/11/2026WINTON GROUP Ltd44,244$0.97M0.0%N/A0.065%Search for SEC Filing on Google Icon
2/11/2026State of Wyoming31,798$0.70M0.1%+111.4%0.047%Search for SEC Filing on Google Icon
2/10/2026Goldman Sachs Group Inc.1,683,400$37M0.0%+17.6%2.483%Search for SEC Filing on Google Icon
2/10/2026Natixis Advisors LLC57,021$1.25M0.0%+1.1%0.084%Search for SEC Filing on Google Icon
2/10/2026BNP Paribas Financial Markets1,248,481$27.44M0.0%+468.5%1.841%Search for SEC Filing on Google Icon
2/10/2026Norges Bank54,306$1.19M0.0%N/A0.080%Search for SEC Filing on Google Icon
2/10/2026Intech Investment Management LLC27,371$0.60M0.0%-62.8%0.040%Search for SEC Filing on Google Icon
2/9/2026Geode Capital Management LLC1,649,383$36.26M0.0%+3.2%2.433%Search for SEC Filing on Google Icon
2/9/2026Royce & Associates LP650,250$14.29M0.1%+27.5%0.959%Search for SEC Filing on Google Icon
2/9/2026Legal & General Group Plc171,861$3.78M0.0%-5.8%0.253%Search for SEC Filing on Google Icon
2/9/2026Lisanti Capital Growth LLC262,885$5.78M1.4%N/A0.388%Search for SEC Filing on Google Icon
2/6/2026Mizuho Markets Americas LLC144,617$3.18M0.1%+23.2%0.213%Search for SEC Filing on Google Icon
2/6/2026Legato Capital Management LLC72,580$1.60M0.1%N/A0.107%Search for SEC Filing on Google Icon
2/6/2026Leonteq Securities AG7,806$0.17M0.0%N/A0.012%Search for SEC Filing on Google Icon
2/6/2026Creative Financial Designs Inc. ADV3,431$75K0.0%+36.0%0.005%Search for SEC Filing on Google Icon
2/6/2026PNC Financial Services Group Inc.22,347$0.49M0.0%+5.6%0.033%Search for SEC Filing on Google Icon
2/6/2026ProShare Advisors LLC13,185$0.29M0.0%+4.6%0.019%Search for SEC Filing on Google Icon
2/5/2026HighMark Wealth Management LLC35,120$0.77M0.3%+49.0%0.052%Search for SEC Filing on Google Icon
2/4/2026VIRGINIA RETIREMENT SYSTEMS ET Al24,700$0.54M0.0%-33.2%0.036%Search for SEC Filing on Google Icon
2/4/2026Prosperitas Financial LLC10,000$0.22M0.1%N/A0.015%Search for SEC Filing on Google Icon
2/2/2026Truist Financial Corp28,171$0.62M0.0%-75.6%0.042%Search for SEC Filing on Google Icon
2/2/2026MN Wealth Advisors LLC13,770$0.30M0.2%-21.0%0.020%Search for SEC Filing on Google Icon
2/2/2026Oppenheimer Asset Management Inc.37,940$0.83M0.0%-8.6%0.056%Search for SEC Filing on Google Icon
1/30/2026Jennison Associates LLC2,021,376$44.43M0.0%+42.3%2.981%Search for SEC Filing on Google Icon
1/29/2026Comerica Bank21,445$0.47M0.0%-16.1%0.032%Search for SEC Filing on Google Icon
1/29/2026Teachers Retirement System of The State of Kentucky16,851$0.37M0.0%-11.3%0.025%Search for SEC Filing on Google Icon
1/29/2026Vanguard Group Inc.7,341,356$161.36M0.0%+3.9%10.828%Search for SEC Filing on Google Icon
1/28/2026Arizona State Retirement System18,897$0.42M0.0%-4.0%0.028%Search for SEC Filing on Google Icon
1/28/2026Paradice Investment Management LLC2,077,745$45.67M8.9%-5.4%3.065%Search for SEC Filing on Google Icon
1/28/2026Universal Beteiligungs und Servicegesellschaft mbH89,094$1.96M0.0%-9.4%0.131%Search for SEC Filing on Google Icon
1/27/2026Zurcher Kantonalbank Zurich Cantonalbank 74,015$1.63M0.0%+245.1%0.109%Search for SEC Filing on Google Icon
1/27/2026Bayforest Capital Ltd27,409$0.60M0.4%+42.1%0.040%Search for SEC Filing on Google Icon
1/26/2026Greenwood Capital Associates LLC15,350$0.34M0.0%N/A0.023%Search for SEC Filing on Google Icon
1/26/2026CWM LLC24,449$0.54M0.0%+11.2%0.036%Search for SEC Filing on Google Icon
1/26/2026KBC Group NV2,011$44K0.0%-99.0%0.003%Search for SEC Filing on Google Icon
1/23/2026Farther Finance Advisors LLC3,600$79K0.0%+36.6%0.005%Search for SEC Filing on Google Icon
1/23/2026State of Alaska Department of Revenue38,676$0.85M0.0%+1.4%0.057%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: $23.39
Low: $23.49
High: $24.30

50 Day Range

MA: $21.66
Low: $18.52
High: $28.26

52 Week Range

Now: $23.39
Low: $9.98
High: $29.65

Volume

392,385 shs

Average Volume

1,988,074 shs

Market Capitalization

$1.60 billion

P/E Ratio

N/A

Dividend Yield

N/A

Beta

1.63

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 (CEO)
  2. Kim D Blickenstaff (Director)
  3. John F Sheridan (CEO)
  4. Susan Morrison (CAO)
  5. Mark David Novara (EVP)
  6. Susan Morrison (EVP)
  7. Brian B Hansen (EVP)
  8. Leigh Vosseller (CFO)
  9. Dick Allen (Director)
  10. John F Sheridan (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. — 10.83%
  2. ArrowMark Colorado Holdings LLC — 4.26%
  3. GW&K Investment Management LLC — 3.95%
  4. State Street Corp — 3.90%
  5. Paradice Investment Management LLC — 3.06%
  6. Jennison Associates LLC — 2.98%
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. ArrowMark Colorado Holdings LLC
  2. Royal Bank of Canada
  3. Freestone Grove Partners LP
  4. Trexquant Investment LP
  5. KBC Group NV
  6. Susquehanna Portfolio Strategies LLC
  7. Schonfeld Strategic Advisors LLC
  8. Millennium Management LLC

Which institutional investors are buying Tandem Diabetes Care stock?

In the last quarter, TNDM stock was purchased by institutional investors including:
  1. Assenagon Asset Management S.A.
  2. First Light Asset Management LLC
  3. BNP Paribas Financial Markets
  4. Marshall Wace LLP
  5. Jennison Associates LLC
  6. Vanguard Group Inc.
  7. Lisanti Capital Growth LLC
  8. Balyasny Asset Management L.P.
Within the last year, these company insiders have bought Tandem Diabetes Care stock:
  1. Kim D Blickenstaff (CEO)
  2. Kim D Blickenstaff (Director)
  3. John F Sheridan (CEO)
  4. Susan Morrison (CAO)
Learn More investors buying Tandem Diabetes Care stock.

Tandem Diabetes Care Active Insiders

John F Sheridan
John F Sheridan (Age 71)
CEO
Jean-Claude Kyrillos
Jean-Claude Kyrillos
Executive Vice President and Chief Operating Officer
Mark David Novara
Mark David Novara
Executive Vice President and Chief Commercial Officer
2 recent trades
Shannon Marie Hansen
Executive Vice President, Chief Legal, Privacy and Compliance Officer and Secretary
Leigh Vosseller
Leigh Vosseller (Age 53)
CFO
Christopher J. Twomey
Director
Rebecca B Robertson
Director
Kim D Blickenstaff
Kim D Blickenstaff
Director
Kathleen Mcgroddy-Goetz
Kathleen Mcgroddy-Goetz
Director
Dick Allen
Director
David B Berger (Age 56)
EVP
Brian B. Hansen
Brian B. Hansen (Age 58)
EVP
Susan Morrison
Susan Morrison (Age 46)
EVP
Elizabeth Anne Gasser
Elizabeth Anne Gasser
EVP
James Leal
SVP