TNDM on Nasdaq

Tandem Diabetes Care, Inc.

American diabetes-technology company

Tandem Diabetes Care, Inc. is an American medical-device company that develops and markets insulin pumps, automated insulin delivery systems and diabetes-management software. Headquartered in San Diego, California, its principal pump platforms are the t:slim X2 and Tandem Mobi, both of which use the company's Control-IQ+ software with compatible continuous glucose monitors (CGMs). Tandem was founded in 2006 and introduced its first pump, the touchscreen t:slim, in 2012.3 Its shares trade on Nasdaq under the symbol TNDM.1 Wikipedia text CC BY-SA 4.0

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Last updated Oct 21, 2026.

Overview

Jan 1, 2008Founded1

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  • TickerTNDM on Nasdaq1
  • IndustrySurgical & Medical Instruments & Apparatus1
  • HeadquartersSan Diego1
  • Websitewww.tandemdiabetes.com
  • Legal formDelaware corporation1
  • Incorporated inDE5
  • Business address12400 High Bluff Drive, San Diego, Ca 921305
  • Filer categoryLarge accelerated filer5
  • LEI549300JEPFOD0K4D3I054
  • StatusActive4
  • LEI statusIssued and current4
  • Registered addressC/o Corporation Service Company, 19808 Wilmington, United States4
  • Registered withDivision of Corporations, Department of State, 44851604
Tandem HQ
Photo: Leonard Teyssier, CC BY-SA 4.0, via Wikimedia Commons8

Tandem Diabetes Care, Inc. is an American medical-device company that develops and markets insulin pumps, automated insulin delivery systems and diabetes-management software. Headquartered in San Diego, California, its principal pump platforms are the t:slim X2 and Tandem Mobi, both of which use the company's Control-IQ+ software with compatible continuous glucose monitors (CGMs).3

Financials

From the company’s reports to the SEC. Every number links to the filing it came from.

Key numbers, fiscal 2025

53.8%Gross margin9
-18.5%Operating margin9
-20.2%Net margin9
7.9%Revenue growth, 20259
-131.9%Return on equity9
2.00×Debt to equity9
-$29.7MFree cash flow9

What sells

Revenue by product, business segment and region, as the company reports it to the SEC.

Products and services

Supplies and Other brought in 54% of the revenue Tandem Diabetes Care, Inc. broke down this way in fiscal 2025.

  1. Supplies and Other$550.6M954%up 16% from 2024
  2. Pump$464.1M946%up 7% from 2024
Products and services by year
Products and services202320242025
Supplies and Other$407.0M$475.8M$550.6M
Pump$365.8M$434.2M$464.1M

Regions

United States brought in 70% of the revenue Tandem Diabetes Care, Inc. broke down this way in fiscal 2025.

  1. United States$706.9M970%up 5% from 2024
  2. Outside the United States$307.8M930%up 15% from 2024
Regions by year
Regions202320242025
United States$554.9M$672.7M$706.9M
Outside the United States$192.8M$267.5M$307.8M

Where the money goes

Where each dollar of revenue went, fiscal 2025

  • Cost of revenue46¢$468.7M
  • Selling, general and admin44¢$445.0M
  • Other costs10¢$96.6M
  • Income tax0¢$4.4M

Out of $1.0B in revenue.9 The company lost money this year.

Financial statements

Revenue101112139$1.0B in 2025+180% since 2019
0$500.0M$1.0B$1.5B2019: $362.3M$362.3M20192020: $498.8M$498.8M2020+38%2021: $702.8M$702.8M2021+41%2022: $801.2M$801.2M2022+14%2023: $747.7M$747.7M2023−7%2024: $940.2M$940.2M2024+26%2025: $1.0B$1.0B2025+8%
Gross profit101112139$546.0M in 2025+181% since 2019
0$200.0M$400.0M$600.0M2019: $194.2M$194.2M20192020: $260.5M$260.5M2020+34%2021: $376.2M$376.2M2021+44%2022: $413.0M$413.0M2022+10%2023: $367.7M$367.7M2023−11%2024: $489.6M$489.6M2024+33%2025: $546.0M$546.0M2025+12%
Operating income101112139-$187.3M in 2025+1020% since 2019
-$300.0M-$200.0M-$100.0M0$100.0M2019: -$16.7M-$16.7M20192020: -$8.0M-$8.0M2020−52%2021: $22.7M$22.7M20212022: -$92.8M-$92.8M20222023: -$233.2M-$233.2M2023+151%2024: -$99.1M-$99.1M2024−57%2025: -$187.3M-$187.3M2025+89%
Net income101112139-$204.7M in 2025+727% since 2019
-$300.0M-$200.0M-$100.0M0$100.0M2019: -$24.8M-$24.8M20192020: -$34.4M-$34.4M2020+39%2021: $15.6M$15.6M20212022: -$94.6M-$94.6M20222023: -$222.6M-$222.6M2023+135%2024: -$96.0M-$96.0M2024−57%2025: -$204.7M-$204.7M2025+113%

Every line of the income statement as filed: the last 3 fiscal years (annual) or 2 quarters (quarterly), latest first.9

Period ending2025-12-312024-12-312023-12-31
Sales$1.0B$940.2M$747.7M
Cost of sales$468.7M$450.6M$380.0M
Gross profit$546.0M$489.6M$367.7M
Selling, general and administrative$445.0M$389.8M$352.5M
Research and development$193.1M$198.9M$169.7M
Acquired in-process research and development expenses$75.2M$0$78.8M
Litigation and settlement expense$20.0M$0$0
Total operating expenses$733.3M$588.7M$600.9M
Operating loss-$187.3M-$99.1M-$233.2M
Interest income and other income, net$9.1M$18.0M$22.9M
Interest expense-$7.9M-$7.4M-$9.9M
Loss from equity method investments-$14.2M-$2.1M$0
Loss on extinguishment of debt$0-$1.3M$0
Total other income (expense), net-$13.0M$7.3M$13.0M
Loss before income taxes-$200.3M-$91.9M-$220.3M
Income tax expense$4.4M$4.2M$2.4M
Net loss-$204.7M-$96.0M-$222.6M
Unrealized gain (loss) on short-term investments$517.0K-$311.0K$3.6M
Unrealized loss on cash flow hedges-$312.0K$0$0
Foreign currency translation gains (losses)$7.3M-$3.0M-$420.0K
Comprehensive loss-$197.2M-$99.3M-$219.4M
Net loss per share - basic (in dollars per share)-$3.04-$1.47-$3.43
Net loss per share - diluted (in dollars per share)-$3.04-$1.47-$3.43
Weighted average shares used to compute basic net loss per share (in shares)67.3M shares65.5M shares65.0M shares
Weighted average shares used to compute diluted net loss per share (in shares)67.3M shares65.5M shares65.0M shares

Compare Tandem Diabetes Care, Inc. with another company

Corporate structure

Tandem Diabetes Care, Inc. sits at the top of its group. 9 entities, 7 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

Major holders of Tandem Diabetes Care, Inc.

  • Voya Financial Filed SCHEDULE 13G/A on Tandem Diabetes Care, Inc., latest Aug 6, 2026 (2 filings since May 5, 2026)
  • VANGUARD CAPITAL MANAGEMENT LLC Filed SCHEDULE 13G on Tandem Diabetes Care, Inc., latest Apr 30, 2026
  • VANGUARD PORTFOLIO MANAGEMENT LLC Filed SCHEDULE 13G on Tandem Diabetes Care, Inc., latest Apr 29, 2026
  • VANGUARD GROUP INC Filed SCHEDULE 13G/A on Tandem Diabetes Care, Inc., latest Mar 27, 2026 (5 filings since Feb 10, 2022)
  • ArrowMark Colorado Holdings LLC Filed SCHEDULE 13G/A on Tandem Diabetes Care, Inc., latest Feb 17, 2026 (2 filings since Nov 13, 2025)
  • Sessa Capital (Master), L.P. Filed SCHEDULE 13G on Tandem Diabetes Care, Inc., latest May 15, 2025
  • BlackRock Filed SCHEDULE 13G/A on Tandem Diabetes Care, Inc., latest Apr 29, 2025 (7 filings since Jan 10, 2022)
  • EMINENCE CAPITAL, LP Filed SC 13G/A on Tandem Diabetes Care, Inc., latest Nov 14, 2024 (2 filings since Feb 14, 2024)
  • Capital World Investors Filed SC 13G/A on Tandem Diabetes Care, Inc., latest Sep 9, 2024 (5 filings since Feb 11, 2022)
  • FMR LLC Filed SC 13G/A on Tandem Diabetes Care, Inc., latest Feb 9, 2024 (5 filings since Feb 9, 2022)
  • Jackson Square Partners, LLC Filed SC 13G/A on Tandem Diabetes Care, Inc., latest Feb 11, 2022
  • Tandem Diabetes Care, Inc. Wilmington, Delaware, United States
    • Tandem Diabetes Care Canada, Inc. Subsidiary · Canada
    • Tandem Diabetes Care Europe B.V. Subsidiary · Netherlands
    • Tandem Diabetes Care International Sarl Subsidiary · Switzerland
    • Tandem Diabetes France SAS Subsidiary · France
    • Tandem Diabetes International Holdings B.V. Subsidiary · Netherlands
    • Tandem Diabetes UK Limited Subsidiary · United Kingdom
    • Tandem Germany GmbH Subsidiary · Germany
    • TandTandem Diabetes Care Switzerland Sarl Subsidiary · Switzerland

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

What it owns

What Tandem Diabetes Care, Inc. reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Property and equipment

ItemLatestA year beforeChange
Property and equipment, before depreciation$156.6M9 Dec 31, 2025$141.0M9 Dec 31, 2024+11.1%
Accumulated depreciation$73.0M9 Dec 31, 2025$62.8M9 Dec 31, 2024+16.3%
Property and equipment, net$83.6M9 Dec 31, 2025$78.2M9 Dec 31, 2024+6.9%
Operating-lease assets (leased space)$96.2M9 Dec 31, 2025$85.3M9 Dec 31, 2024+12.7%

Investments

ItemLatestA year beforeChange
Cash and cash equivalents$90.6M9 Dec 31, 2025$69.2M9 Dec 31, 2024+30.9%
Marketable securities, current$202.0M9 Dec 31, 2025$369.1M9 Dec 31, 2024−45.3%
Debt securities available for sale$202.0M9 Dec 31, 2025$369.1M9 Dec 31, 2024−45.3%
Stakes in other companies (equity method)$60.4M9 Dec 31, 2025$74.5M9 Dec 31, 2024−19.0%

Intangibles and goodwill

ItemLatestA year beforeChange
Finite-lived intangibles, gross$25.8M9 Dec 31, 2025$12.5M9 Dec 31, 2024+106.4%
Accumulated amortization$14.1M9 Dec 31, 2025$11.6M9 Dec 31, 2024+21.6%
Finite-lived intangibles, net$11.7M9 Dec 31, 2025$925.0K9 Dec 31, 2024+1167.0%

Inventory

ItemLatestA year beforeChange
Inventory, total$128.8M9 Dec 31, 2025$149.6M9 Dec 31, 2024−13.9%
Raw materials$31.8M9 Dec 31, 2025$32.6M9 Dec 31, 2024−2.6%
Work in process$23.8M9 Dec 31, 2025$33.5M9 Dec 31, 2024−29.0%
Finished goods$73.2M9 Dec 31, 2025$83.5M9 Dec 31, 2024−12.3%

Properties, in its own words

Our corporate headquarters and principal offices are located at a 181,949 square foot facility we lease in San Diego, California. The initial lease term expires in April 2035, and we have two options to extend the lease for additional five-year periods as well as a right of first offer with respect to an additional 16,154 square feet of general office space should the space become available. We lease additional office space in San Diego, California, primarily for research and development activities. We also lease office space in four countries internationally to facilitate operations.

We believe that the facilities that we presently occupy will be sufficient to support our current operations and that suitable additional facilities would be available to us should our operations require it.

Item 2 of the 10-K filed Feb 19, 2026.17

The story

The company was incorporated in January 2006 as Phluid, Inc. and changed its name to Tandem Diabetes Care in 2008. Former Biosite executive Kim Blickenstaff joined as president and chief executive officer in 2007. Its first product was designed following interviews with pump users and clinicians and used a color touchscreen rather than the button-based interfaces then common on insulin pumps.

The Food and Drug Administration (FDA) cleared the t:slim insulin-delivery system in November 2011, and Tandem began selling it in the United States the following year. In November 2013, Tandem sold eight million shares at $15 each in its initial public offering, raising approximately $108 million after costs.

Tandem began shipping the software-updatable t:slim X2 in 2016. The FDA subsequently authorized versions that displayed readings from the Dexcom G5 and G6 CGMs, and in 2019 classified the t:slim X2 as the first alternate controller enabled insulin pump, a category designed to support interoperable diabetes devices. John Sheridan, previously the company's chief operating officer, succeeded Blickenstaff as president and CEO in March 2019.

The company acquired the diabetes-data application Sugarmate in June 2020. It acquired infusion-set developer Capillary Biomedical for $24.7 million in July 2022 and Swiss patch-pump developer AMF Medical in January 2023. AMF had been developing Sigi, a rechargeable patch pump that used prefilled insulin cartridges; the product remained in development at the end of 2025.

From Wikipedia’s article on Tandem Diabetes Care, shared under CC BY-SA 4.0.6

Leadership

Who has led Tandem Diabetes Care, Inc., and when. Pick a name to see everywhere that person has worked.

Board members and other officers (27)

Products and brands

t:slim X2

The t:slim X2 is a rechargeable, touchscreen insulin pump with a 300-unit cartridge. It delivers programmed basal and bolus insulin through an infusion set and can receive software updates without replacement of the pump hardware. When used with a compatible CGM and Control-IQ technology, it can automatically adjust insulin delivery. The platform has supported integrations with Dexcom and FreeStyle Libre sensors in different markets.

The t:slim line replaced Tandem's earlier t:flex and t:slim G4 models. The t:slim G4, approved in 2015, combined a Tandem pump with the Dexcom G4 Platinum CGM display.

Tandem Mobi

The Tandem Mobi is a smaller durable pump intended to be worn on the body or carried in clothing. It uses a 200-unit cartridge and is operated principally from a compatible smartphone app, while a physical button can deliver a preset bolus. The FDA cleared the pump in July 2023, and Tandem began its full United States launch in February 2024. The company obtained a CE mark for Mobi in 2025 and subsequently began introducing it in European markets.

Automated insulin delivery

Tandem introduced Basal-IQ in 2018. The feature used predicted CGM values to suspend insulin delivery when glucose was expected to become low and resumed delivery when values recovered.

Read the full text

Control-IQ is a hybrid closed-loop system that uses CGM readings and a model-predictive algorithm to increase, decrease or suspend basal insulin and to deliver automatic correction boluses. Users still program personal therapy settings and normally announce meals. The FDA authorized Control-IQ through the De Novo pathway in December 2019, creating a regulatory category for interoperable automated glycemic controllers. Tandem launched it in the United States in January 2020 as a software update for compatible t:slim X2 pumps.

A revised version, Control-IQ+, broadened supported therapy settings and was cleared in 2025 for adults with type 2 diabetes who require insulin. In the United States, Control-IQ+ is used on both the t:slim X2 and Mobi platforms.

Data applications

The FDA cleared Tandem's t:connect desktop data-management application in 2013. A later mobile version displays pump and CGM information and, on compatible systems, permits bolus delivery from a phone. Tandem Source, introduced in the United States in 2023, is a web platform through which users and clinicians review therapy data. Sugarmate is a separate application for viewing CGM data and receiving customizable alerts.

From Wikipedia’s article on Tandem Diabetes Care, shared under CC BY-SA 4.0.6

Subsidiaries and ownership

Subsidiaries (Exhibit 21)

  • TandTandem Diabetes Care Switzerland Sarl Switzerland7
  • Tandem Diabetes Care Canada, Inc. Canada7
  • Tandem Diabetes Care Europe B.V. The Netherlands7
  • Tandem Diabetes Care International Sarl Switzerland7
  • Tandem Diabetes France SAS France7
  • Tandem Diabetes International Holdings B.V. The Netherlands7
  • Tandem Diabetes UK Limited United Kingdom7
  • Tandem Germany GmbH Germany7

The subsidiaries the company lists in Exhibit 21 of its annual report, as filed.

Timeline

  1. Aug 6, 20268-K Results of operations52
  2. May 21, 20268-K Change to shareholders' rights; Executive or director change; Shareholder vote53
  3. May 15, 20268-K Executive or director change54
  4. May 7, 20268-K Results of operations55
  5. Feb 27, 20268-K Entered a material agreement; New debt or obligation; Unregistered sale of shares56
  6. Feb 19, 20268-K Results of operations57
  7. Dec 30, 20258-K Bylaws or fiscal year changed58
  8. Nov 12, 20258-K Executive or director change59
  9. Nov 6, 20258-K Results of operations60
  10. Aug 7, 20258-K Other events61
  11. Aug 6, 20258-K Results of operations62
  12. May 23, 20258-K Entered a material agreement; Shareholder vote63
  13. May 17, 2019New chief executive John F. Sheridan becomes CEO18
  14. Nov 13, 2013New chief executive Kim D. Blickenstaff becomes CEO19
  15. Jan 1, 2008Founded Founded1

Calendar

Coming up

  1. Nov 5, 2026 · After the closeReports results for the quarter ending Sep/2026 A year earlier it reported ($0.31) a share, on Nov 6, 2025.64

When it reported results

  1. Aug 6, 2026Reported quarterly or annual results52
  2. May 7, 2026Reported quarterly or annual results55
  3. Feb 19, 2026Reported quarterly or annual results57
  4. Nov 6, 2025Reported quarterly or annual results60
  5. Aug 6, 2025Reported quarterly or annual results62
  6. Apr 30, 2025Reported quarterly or annual results65
  7. Feb 26, 2025Reported quarterly or annual results66
  8. Nov 6, 2024Reported quarterly or annual results67

Upcoming dates from Nasdaq's calendar; past results from the company's 8-K filings (Item 2.02). The full markets calendar

Filings

532 filings to the SEC since October 2021: 5 annual reports, 15 quarterly reports, 47 major events, 395 insider forms, 32 large holders, 38 other. The latest 20:

  1. Sep 17, 2026144 EDGAR
  2. Aug 18, 2026144 EDGAR
  3. Aug 18, 20264 EDGAR
  4. Aug 18, 20264 EDGAR
  5. Aug 18, 20264 EDGAR
  6. Aug 18, 20264 EDGAR
  7. Aug 18, 20264 EDGAR
  8. Aug 18, 20264 EDGAR
  9. Aug 18, 20264 EDGAR
  10. Aug 6, 2026SCHEDULE 13G/A EDGAR
  11. Aug 6, 202610-Q EDGAR
  12. Aug 6, 20268-K EDGAR
  13. Jul 17, 20264 EDGAR
  14. Jun 17, 2026144 EDGAR
  15. Jun 4, 20264 EDGAR
  16. Jun 2, 20264 EDGAR
  17. Jun 2, 20264 EDGAR
  18. Jun 2, 20264 EDGAR
  19. Jun 2, 20264 EDGAR
  20. Jun 2, 20264 EDGAR

The 532 filings since October 2021 can be filtered by form type and year here when JavaScript is on.

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Insider trades

52 open-market trades by officers, directors and large owners since October 2021: 15 buys and 37 sales. Grants, option exercises and gifts are left out.

DateWhoTradeSharesPriceValueFiling
Mar 17, 2026Novara Mark DavidEVP & CHIEF COMMERCIAL OFFICERSale187$23.05$4.3KForm 4
Mar 5, 2026Novara Mark DavidEVP & CHIEF COMMERCIAL OFFICERSale2$22.81$46Form 4
Aug 11, 2025Sheridan John FPRESIDENT & CEOBuy10,000$10.23$102.3KForm 4
Aug 8, 2025Vosseller LeighEVP & CHIEF FINANCIAL OFFICERBuy13,720$10.89$149.4KForm 4
Mar 7, 2025Kyrillos Jean-ClaudeEVP & Chief Operating OfficerBuy10,538$18.12$190.9KForm 4
Nov 21, 2024BLICKENSTAFF KIM DDirectorSale30,000$31.38$941.4KForm 4
Nov 20, 2024BLICKENSTAFF KIM DDirectorSale10,000$30.00$300.0KForm 4
Nov 15, 2024Novara Mark DavidEVP & CHIEF COMMERCIAL OFFICERBuy532$23.24$12.4KForm 4
May 30, 2024Allen DickSale5,000$51.68$258.4KForm 4
Nov 27, 2023Allen DickBuy5,000$18.96$94.8KForm 4
Nov 8, 2023Vosseller LeighEVP & CHIEF FINANCIAL OFFICERBuy6,200$15.39$95.4KForm 4
Nov 8, 2023Hansen Shannon MarieEVP & Chief Legal OfficerBuy1,935$15.44$29.9KForm 4
Sep 15, 2023McGroddy-Goetz KathleenDirectorBuy1,000$21.45$21.4KForm 4
May 18, 2023Allen DickBuy10,000$29.47$294.7KForm 4
May 17, 2023Howell Peyton RDirectorBuy3,000$30.16$90.5KForm 4
May 12, 2023Vosseller LeighEVP & CHIEF FINANCIAL OFFICERBuy3,015$32.77$98.8KForm 4
Mar 3, 2023BERGER DAVID BEVP & Chief Operating OfficerSale10,000$41.19$411.9KForm 4
Dec 16, 2022BERGER DAVID BEVP & Chief Operating OfficerSale10,000$40.25$402.5KForm 4
Dec 15, 2022BERGER DAVID BEVP & Chief Operating OfficerSale15,000$40.32$604.8KForm 4
Jun 8, 2022BERGER DAVID BEVP & Chief Operating OfficerSale10,097$65.02$656.5KForm 4

All 52 trades can be filtered by person here when JavaScript is on.

From Forms 4 filed with the SEC.

Major holders

Investors who own more than 5% of the shares must tell the SEC: a 13D if they may seek to influence the company, a 13G if they hold passively.

Executive pay

What the company paid its top executives, from the summary compensation table in its proxy statement. Total pay includes salary, bonus, stock and option awards and other pay, as the company valued them.

YearExecutiveAgeSalaryTotal pay
2025John SheridanPresident and Chief Executive Officer70$790.6K$6.9M79
2025Mark NovaraExecutive Vice President, Chief Commercial Officer51$486.2K$2.2M79
2025Leigh VossellerExecutive Vice President, Chief Financial Officer and Treasurer53$486.2K$2.2M79
2025Elizabeth GasserExecutive Vice President, Chief Strategy and Product Officer50$463.7K$1.7M79
2025Shannon HansenExecutive Vice President, Chief Legal, Privacy and Compliance Officer and Secretary60$463.7K$1.7M79
2024John SheridanPresident and Chief Executive Officer70$732.0K$8.5M79
2024Leigh VossellerExecutive Vice President, Chief Financial Officer and Treasurer53$450.2K$2.5M79
2024Elizabeth GasserExecutive Vice President, Chief Strategy and Product Officer50$450.2K$2.0M79
2024Mark NovaraExecutive Vice President, Chief Commercial Officer51$450.2K$802.7K79
2023John SheridanPresident and Chief Executive Officer70$710.7K$4.7M79
2023Mark NovaraExecutive Vice President, Chief Commercial Officer51$57.5K$2.7M79
2023Leigh VossellerExecutive Vice President, Chief Financial Officer and Treasurer53$437.1K$1.3M79
2023Elizabeth GasserExecutive Vice President, Chief Strategy and Product Officer50$437.1K$1.3M79

Held by these funds

The largest holders among investment managers' 13F reports for the quarter ending Jun 30, 2026, the top 25 of 100. Change is in shares since the quarter before.

FundSharesValueShare of the fundChange
BlackRock, Inc.11,583,125$174.8M0.0%+892,281
Sessa Capital IM, L.P.5,100,000$77.0M1.3%+369,243
Vanguard Portfolio Management LLC4,299,667$64.9M0.0%+306,334
First Light Asset Management, LLC3,383,553$51.1M3.1%+2,068,838
Vanguard Capital Management LLC3,096,536$46.7M0.0%+57,617
State Street Corp2,851,646$43.0M0.0%+189,386
Jennison Associates LLC2,331,429$35.2M0.0%+672,981
Paradice Investment Management LLC2,024,014$30.5M4.9%−18,411
Jacobs Levy Equity Management, Inc2,006,429$30.3M0.1%+482,483
Freestone Grove Partners LP1,866,134$28.2M0.2%+535,392
Geode Capital Management, LLC1,800,797$27.2M0.0%+120,934
Driehaus Capital Management LLC1,786,996$27.0M0.2%−517,418
Citadel Advisors LLC1,735,879$26.2M0.0%−456,788
Millennium Management LLC1,311,739$19.8M0.0%+550,067
Woodline Partners LP1,307,439$19.7M0.1%New
ArrowMark Colorado Holdings LLC1,299,586$19.6M0.8%−1,804,023
UBS Group AG1,146,580$17.3M0.0%−901,221
Fmr LLC976,432$14.7M0.0%+262,421
Royce & Associates LP900,590$13.6M0.1%+204,000
Wellington Management Group Llp871,811$13.2M0.0%−170,953
Goldman Sachs Group Inc862,301$13.0M0.0%−1,356,621
Northern Trust Corp753,690$11.4M0.0%+47,081
Verition Fund Management LLC700,000$10.6M0.1%+592,881
ExodusPoint Capital Management, LP691,789$10.4M0.1%+58,890
Qube Research & Technologies Ltd683,823$10.3M0.0%+631,862

13F reports cover disclosed long positions in U.S. stocks only.

Members of Congress who traded it

7 trades disclosed by members of Congress. “Vs S&P since” is the stock’s change since the trade minus the S&P 500’s.

DateMemberTradeAmountVs S&P sinceFiling
Sep 29, 2026Gilbert Ray Cisneros, Jr.Democratic, HouseBuy$1,001 - $15,000−2.7%Report
Mar 3, 2026Gilbert Ray Cisneros, Jr.Democratic, HouseBuy$1,001 - $15,000−44.8%Report
Sep 22, 2025Josh GottheimerDemocratic, HouseBuy$1,001 - $15,000+9.0%Report
Mar 19, 2025Josh GottheimerDemocratic, HouseSale$1,001 - $15,000+57.1%Report
Mar 4, 2025Gilbert Ray Cisneros, Jr.Democratic, HouseBuy$1,001 - $15,000−50.2%Report
Aug 5, 2024Josh GottheimerDemocratic, HouseBuy$1,001 - $15,000−109.2%Report
Jul 12, 2023Daniel S. GoldmanDemocratic, HouseSale$1,001 - $15,000+117.7%Report

Members report amounts as ranges, not exact figures. Returns are price-only (no dividends).

SEC filer profile

How Tandem Diabetes Care, Inc. is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGARTANDEM DIABETES CARE INC2
  • CIK0001438133
  • Employer ID (EIN)20-432750817
  • Filer statusLarge accelerated filer not an emerging growth company; not a smaller reporting company; not a shell company17
  • Incorporated inDelaware17
  • Fiscal year endsDecember 312
  • Industry code (SIC)3841 Surgical & Medical Instruments & Apparatus2
  • SEC reviewing officeOffice of Industrial Applications and Services, Division of Corporation Finance2
  • Business address12400 High Bluff Drive, San Diego, CA 921302
  • Phone858-366-69002
  • Shares outstanding69,578,707 as of Aug 3, 202615
  • Public float$1.3B as of Jun 30, 202517
  • AuditorErnst & Young LLP, San Diego, California PCAOB ID 42; it also attests to the company’s internal control over financial reporting17
  • On EDGAR sinceJun 13, 20082
  • Filings1,259 in all: 4 (757), 8-K (158), SC 13G/A (43), 3 (41), 10-Q (38), SC 13G (24), DEFA14A (22), CORRESP (15)2
    All 42 form types

    UPLOAD (15), DEF 14A (14), 10-K (13), SD (11), S-8 (10), 144 (8), 4/A (7), 424B5 (7), S-1/A (7), SC 13D/A (7), CT ORDER (6), EFFECT (6), SCHEDULE 13G (5), ARS (4), PRE 14A (4), SCHEDULE 13G/A (4), 424B4 (3), D (3), FWP (3), S-1 (3), S-3 (3), SC 13D (3), 10-Q/A (2), S-1MEF (2), S-3MEF (2), 10-K/A (1), 3/A (1), 8-A12B (1), CERTNAS (1), D/A (1), DRS (1), DRS/A (1), DRSLTR (1), REGDEX (1)

  • Latest filingsAnnual report (10-K) Feb 19, 2026
    Quarterly report (10-Q) Aug 6, 2026
    Proxy statement (DEF 14A) Apr 7, 2026
    Latest 8-K (8-K) Aug 6, 2026

Securities registered for trading

ClassSymbolExchange
Common Stock, par value $0.001 per shareTNDMNasdaq Global Market

From the cover page of the 10-K filed Feb 19, 2026 (Section 12(b) of the Exchange Act).17

Risk factors and legal proceedings

The risks Tandem Diabetes Care, Inc. names in Item 1A of its 10-K filed Feb 19, 2026: 63 risks under these headings, as written.17

  • Risks Related to Our Business and Our Industry
  • We have incurred significant operating losses since inception and cannot assure you that we will achieve sustained profitability.
  • We currently rely on sales of insulin pump products to generate a significant portion of our sales, and any factors that negatively impact sales of these products may adversely affect our business, financial condition and operating results.
  • We are implementing a multi-channel managed care strategy in the United States that impacts the pricing model for our pumps and our supplies sold through the pharmacy channel. If our pharmacy channel strategy fails to achieve its intended outcome, our growth, business, results of operations, and financial condition could be materially and adversely impacted.
  • Our ability to maintain and grow our sales depends in part on retaining a high percentage of our customer base.
  • Failure to secure or retain adequate coverage or reimbursement for our current and future products by third-party payors could adversely affect our business, financial condition and operating results.
  • We operate in a very competitive industry and if we fail to compete successfully against our existing or future competitors, or if the competitive environment harms our business partners, our financial condition and operating results may be negatively affected.
  • Competing products, therapeutic techniques or other technological developments and breakthroughs for the monitoring, treatment or prevention of diabetes may render our products obsolete or less desirable or reduce the size of our potential market.
  • We may face unexpected challenges in marketing and selling our products, and training new customers on the use of our products, which could harm our ability to achieve our sales forecasts.
  • Our sales and marketing efforts largely depend on independent distributors who are free to market products that compete with our products. If we are unable to maintain or expand our network of independent distributors, our sales may be negatively affected.
  • If the third parties on which we increasingly rely to assist us with our current and anticipated pre-clinical development or clinical trials do not perform as expected, we may not be able to obtain regulatory clearance, certification, or approval or commercialize our products.
  • We are dependent on clinical investigators and clinical sites to enroll participants in our current and anticipated clinical trials and human factors studies, and the failure to successfully complete those trials and studies could prevent us from obtaining regulatory clearances, certifications, or approvals for or commercializing our products.
The other 52 risks
  • If important assumptions about the potential market for our products are inaccurate, or if we have failed to understand what people with insulin-dependent diabetes are seeking in an insulin pump, our business and operating results may be adversely affected.
  • Any concerns regarding the safety and efficacy of our products could limit sales and cause unforeseen negative effects on our business prospects and financial results.
  • Our ability to achieve profitability will depend, in part, on our ability to reduce the per-unit cost of our products while also increasing production volume.
  • Manufacturing risks may adversely affect our ability to manufacture products, which could negatively impact our sales and operating margins.
  • We depend on a limited number of third-party suppliers for certain components and products, and the loss of any of these suppliers, their inability to provide us with an adequate supply of components or products, or our inability to adequately forecast customer demand, could harm our business.
  • Any disruption at one of our facilities could adversely affect our business and operating results.
  • We may not experience the anticipated operating efficiencies of our manufacturing and warehousing operations.
  • We may enter into collaborations, licensing arrangements, joint ventures, strategic alliances or partnerships with third parties that may not result in the development of commercially viable products or the generation of significant future sales.
  • Modifications to our business strategy or restructuring of our operations could lead to higher costs or otherwise impact the profitability of our business or the value of our assets.
  • Risks Related to Our International Operations
  • Commercializing our products internationally may result in a variety of risks associated with international operations that could materially adversely affect our business.
  • Failure to obtain any required regulatory authorization, clearance or certification in foreign jurisdictions will prevent us from marketing our products in international markets.
  • Failure to comply with the U.S. Foreign Corrupt Practices Act and similar worldwide anti-bribery laws could materially adversely affect our business and result in civil and/or criminal sanctions.
  • Risks Related to Our Indebtedness
  • We have incurred a significant amount of indebtedness, and the agreements governing such indebtedness subject us to required debt service payments, which may restrict our financial flexibility and affect our ability to operate our business.
  • Servicing the 2029 Notes will require a significant amount of cash, and we may not have sufficient cash flow from our business to repay the 2029 Notes.
  • We may not have sufficient cash or be able to obtain financing to repurchase the 2029 Notes upon a fundamental change, or to settle conversions of the 2029 Notes.
  • Conversion of the 2029 Notes will, to the extent we deliver shares upon conversion of such 2029 Notes, dilute the ownership interest of existing stockholders and may otherwise have a negative impact on the trading price of our common stock.
  • Certain provisions in the indentures governing the 2029 Notes may delay or prevent an otherwise beneficial takeover attempt.
  • The Capped Call Transactions may affect the value of the 2029 Notes and our common stock.
  • We are subject to counterparty risk with respect to the 2029 Capped Call Transactions.
  • Risks Related to Our Future Financings and Financial Results
  • We may need or otherwise determine to raise additional funds in the future and if we are unable to raise additional funds when necessary or desirable, we may not be able to achieve our strategic objectives.
  • Our operating results may fluctuate significantly from quarter to quarter.
  • Risks Related to Macroeconomic Conditions and External Factors
  • International trade policies, including tariffs, sanctions and trade barriers may adversely affect our business, financial condition and operating results.
  • Uncertainty in current global economic and political conditions could adversely affect our ability to predict product demand and impact our financial results and make it more likely that our actual results could differ materially from expectations.
  • Public health threats, epidemics, or pandemics could have a material adverse effect on our operations, the operations of our business partners, and the global economy as a whole.
  • Because our business is global our sales and profits may fluctuate or decline in response to changes in foreign currency exchange rates or other international risks.
  • The effects of inflation could adversely affect our business.
  • Risks Related to Privacy and Security
  • We are and may become subject to stringent and evolving United States and foreign laws, regulations, and rules, contractual obligations, policies and other obligations related to data privacy and security. Our actual or perceived failure to comply with such obligations could lead to regulatory investigations or actions; litigation (including class claims) and mass arbitration demands; fines and penalties; disruptions of our business operations; reputational harm; loss of sales or profits; loss of customers; and other adverse business consequences.
  • If our information technology systems or those of third parties with whom we work, our data, or our software are or were compromised, we could experience adverse consequences resulting from such compromise, including but not limited to regulatory investigations or actions; litigation; fines and penalties; disruptions of our business operations; harm to our reputation; loss of sales or profits; loss of customers; and other adverse consequences.
  • Cyberattacks aimed at our devices, products, services, or related systems, with the intent to alter or misuse them in ways that are inconsistent with our FDA clearances and approvals, could pose risks to users.
  • Risks Related to Legal and Intellectual Property
  • Our ability to comprehensively protect our intellectual property and proprietary technology is uncertain.
  • Patent litigation in the medical device industry is common, and we may be subject to litigation that could cause us to incur substantial costs and divert the attention of management from our business.
  • We may be subject to damages resulting from claims that we, or our employees, have wrongfully used or disclosed trade secrets or other proprietary information of our competitors.
  • We may incur product liability losses, and insurance coverage may be inadequate or unavailable to cover these losses.
  • Adhering to regulations concerning public company corporate governance and reporting requirements may place a strain on our resources and distract management from other priorities.
  • Risks Related to Our Regulatory Environment
  • Our products and operations are subject to extensive governmental regulation, and failure to comply with applicable requirements could cause our business to suffer.
  • New products or modifications to our existing products may require new 510(k) clearances, PMAs, CE Marks or other certifications, or may require us to cease marketing or recall the modified products until clearances, certifications or approvals are obtained.
  • A recall or suspension of our products, or the discovery of serious safety issues with our products, could have a significant negative impact on us.
  • Our failure to comply with United States federal and state fraud and abuse laws, including anti-kickback laws and other United States federal and state anti-referral laws, or comparable foreign legislation, could have a material, adverse impact on our business.
  • Legislative or regulatory healthcare reforms, or other regulatory reforms, may result in downward pressure on the price of and decrease reimbursement for our products, and uncertainty regarding the healthcare regulatory environment could have a material adverse effect on our business.
  • Governments internationally tend to impose strict price controls, reimbursement approval and rebate policies, which may adversely affect our ability to generate sales.
  • Our advertising and promotion may include claims about our product in comparison to competing products, which could expose us to heightened regulatory scrutiny, enforcement risks, and the potential for litigation.
  • Direct-to-consumer marketing and social media initiatives may subject us to increased regulatory scrutiny.
  • Risks Related to Environmental, Social and Governance Matters
  • Environmental, social, and governance (ESG) regulations, initiatives, directives, policies, and requirements could expose us to various risks.
  • Our business could be adversely affected by changing expectations and challenges associated with implementing ESG initiatives, establishing ESG-related goals, gathering ESG data, and disclosing ESG-related information.
  • Climate change or other extreme weather conditions and related regulations may have a long-term impact on our business.
  • The price of our common stock may continue to fluctuate significantly.
  • We depend on the knowledge and skills of our senior management and other key employees, and if we are unable to retain and motivate them or recruit additional qualified personnel, our business may suffer.
  • Anti-takeover provisions in our organizational documents and Delaware law may delay or prevent a change of control, which could reduce our stock price and prevent our stockholders from removing our current board of directors.
  • We may seek to grow our business through acquisitions of products or technologies, or investments in businesses, and the failure to successfully manage these acquisitions or investments, or the failure to integrate them with our existing business, could have a material adverse effect on our business, financial condition and operating results.
  • Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.
  • Uncertainties in the interpretation and application of existing, new and proposed tax laws and regulations could materially affect our tax obligations and effective tax rate.
  • If we fail to maintain an effective system of internal control over financial reporting, we may not be able to accurately report our financial results or prevent fraud, which could harm our business and result in a decline in the trading price of our common stock.

Legal proceedings

There are no material pending legal proceedings to which we or any of our subsidiaries is a party or of which any of our property is subject.

The opening of Item 3, Legal Proceedings.17

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