# EDGAR Filing Document

**Accession Number:** 0001438133
**File Stem:** 0001438133-25-000186
**Filing Date:** 2025-11
**Character Count:** 30407
**Document Hash:** 1560d8e3d360d8bd32ba812fb9cdad7f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001438133-25-000186.hdr.sgml**: 20251106

**ACCESSION NUMBER**: 0001438133-25-000186

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20251106

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251106

**DATE AS OF CHANGE**: 20251106

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TANDEM DIABETES CARE INC
- **CENTRAL INDEX KEY:** 0001438133
- **STANDARD INDUSTRIAL CLASSIFICATION:** SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 204327508
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36189
- **FILM NUMBER:** 251458309

**BUSINESS ADDRESS:**
- **STREET 1:** 12400 HIGH BLUFF DRIVE
- **CITY:** San Diego
- **STATE:** CA
- **ZIP:** 92130
- **BUSINESS PHONE:** 858-366-6900

**MAIL ADDRESS:**
- **STREET 1:** 12400 HIGH BLUFF DRIVE
- **CITY:** San Diego
- **STATE:** CA
- **ZIP:** 92130

?xml version='1.0' encoding='ASCII'? tndm-20251106

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

____________________________

**FORM 8-K**

____________________________

**CURRENT REPORT** 

**Pursuant to Section 13 or 15(d)** 

**of The Securities Exchange Act of 1934** 

**Date of Report (Date of earliest event reported): November 6, 2025**

____________________________

**Tandem Diabetes Care, Inc.** 

**(Exact name of registrant as specified in its charter)** 

____________________________

---

| | | | |
|:---|:---|:---|:---|
| **Delaware** | **Delaware** | **001-36189** | **20-4327508** |
| **(State or other jurisdiction<br>of incorporation)** | **(State or other jurisdiction<br>of incorporation)** | **(Commission<br>File Number)** | **(I.R.S. Employer <br> Identification No.)** |
| **12400 High Bluff Drive** | **12400 High Bluff Drive** | | **92130** |
| **San Diego** | **California** | | **(Zip Code)** |
| **(Address of principal executive offices)** | **(Address of principal executive offices)** | | |

---

**Registrant's telephone number, including area code: (858) 366-6900** 

**N/A** 

**(Former name or former address, if changed since last report)** 

____________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐&nbsp;&nbsp;&nbsp;&nbsp;Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐&nbsp;&nbsp;&nbsp;&nbsp;Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐&nbsp;&nbsp;&nbsp;&nbsp;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐&nbsp;&nbsp;&nbsp;&nbsp;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

**Securities registered pursuant to Section 12(b) of the Act:**

---

| | | |
|:---|:---|:---|
| **<u>Title of Each Class</u>** | **<u>Trading Symbol</u>** | **<u>Name of Each Exchange on Which Registered</u>** |
| **Common Stock, par value $0.001 per share** | **TNDM** | **NASDAQ Global Market** |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

____________________________

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**Item 2.02 Results of Operations and Financial Condition**.

On November 6, 2025, we issued a press release reporting our financial results for the quarter ended September 30, 2025. This press release has been furnished as Exhibit 99.1 to this report and is incorporated herein by this reference.

The information under this Item 2.02 and Exhibit 99.1 hereto is being furnished and shall not be deemed "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liabilities of that section, nor shall they be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

**Item 9.01 Financial Statements and Exhibits.**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) &nbsp;&nbsp;&nbsp;&nbsp;Exhibits.

---

| | |
|:---|:---|
| **<u>Number</u>** | **<u>Description</u>** |
| 99.1 | <u>[Press release of Tandem Diabetes Care, Inc. dated September 30, 2025.](ex991-q3earningsrelease2025.htm)</u> |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

------

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
| Tandem Diabetes Care, Inc. | Tandem Diabetes Care, Inc. |
| By: | /s/ SHANNON M. HANSEN |
|  | Shannon M. Hansen |
|  | Executive Vice President, Chief Legal, Privacy & Compliance Officer and Secretary |

---

Date: November 6, 2025

## Exhibit 99.1

Exhibit 99.1

![tandemhorizontallogonewrgba.jpg](tandemhorizontallogonewrgba.jpg)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Media Contact:**

858-366-6900

media@tandemdiabetes.com

**Investor Contact:**

858-366-6900

IR@tandemdiabetes.com

**<u>FOR IMMEDIATE RELEASE</u>**

**Tandem Diabetes Care Announces Third Quarter 2025 Financial Results** 

**San Diego, November 6, 2025 -** Tandem Diabetes Care, Inc. (Nasdaq: TNDM), a global insulin delivery and diabetes technology company, today reported its financial results for the quarter ended September 30, 2025 and reaffirmed full year 2025 guidance.

**Third Quarter 2025 and Recent Highlights**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Achieved record third quarter sales both in the United States (U.S.) and internationally

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Demonstrated year-over-year and sequential gross margin improvement

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Progressed multi-channel initiative by:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;◦ Increasing pharmacy benefit coverage for Tandem Mobi to more than 40% of U.S. lives

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;◦ Introducing t:slim X2 supplies through a pharmacy benefit

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Received 510(k) clearance from the U.S. Food and Drug Administration (FDA) for extended wear use of the SteadiSet Infusion Set

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Filed a 510(k) with the FDA for Android mobile control of the Tandem Mobi insulin delivery system

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Began global commercial rollout of t:slim X2 pump integration with the FreeStyle Libre 3 Plus CGM sensor

"Tandem delivered a strong third quarter performance marked by record quarterly sales, significant gross margin improvement, and meaningful progress on our key strategic initiatives," said John Sheridan, president and chief executive officer. "We are beginning to see the positive impact of our business transformation, which strengthens our ability to achieve Tandem's near- and longer-term goals, while continuing our commitment to improve the lives of people with diabetes."

**Third Quarter 2025 Results Compared to Third Quarter 2024**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• **Sales** <sup>(1)</sup>**:** Worldwide sales increased to $249.3 million, which included sales outside the United States of $73.6 million. This is compared to worldwide sales of $244.0 million, which included sales of $72.3 million outside the United States.

Non-GAAP worldwide sales<sup>(2)</sup> of increased to $249.3 million, which included sales outside of the United States of $73.6 million. This is compared to worldwide sales of $242.9 million, which included sales of $72.3 million outside the United States.

Shipments in the United States were more than 20,000 pumps. Shipments outside the United States were more than 9,000 pumps.

------

Exhibit 99.1

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• **Gross profit** <sup>(1)</sup>**:** GAAP gross profit was $134.3 million, compared to $124.7 million. GAAP gross margin was 54%, compared to 51%.

Non-GAAP gross profit<sup>(2)</sup> was $134.3 million, compared to $124.3 million. Non-GAAP gross margin<sup>(2)</sup> was 54%, compared to 51%.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• **Operating loss:** GAAP operating loss was $22.9 million, or negative 9% of sales, compared to $26.1 million, or negative 11% of sales.

Non-GAAP operating loss<sup>(2)</sup> was $22.9 million, or negative 9% of sales, compared to $26.5 million or negative 11% of sales.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• **Net loss:** GAAP net loss was $21.2 million, compared to net loss of $23.3 million.

Non-GAAP net loss<sup>(2)</sup> was $21.2 million, compared to net loss of $23.6 million.

Adjusted EBITDA<sup>(2)</sup> was $2.8 million, or 1% of sales, compared to $4.0 million, or 2% of sales.

(1) The Tandem Choice program (Tandem Choice) concluded in 2024, and there was no impact to sales or margins for this program in 2025. See "Non-GAAP Financial Measures" below for additional information.

(2) A reconciliation of non-GAAP financial measures to their most directly comparable GAAP financial measures and additional information can be found in Table D "Reconciliation of GAAP versus Non-GAAP Financial Results" attached to this press release. Also see "Non-GAAP Financial Measures" below for additional information.

See tables for additional financial information.

**2025 Financial Guidance** 

For the year ending December 31, 2025, the Company is reaffirming its 2025 financial guidance as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Sales for the full year are estimated to be approximately $1.0 billion.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Sales in the United States of approximately $700 million.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Sales outside the United States of approximately $300 million, which reflects a $10 million headwind associated with the Company's preparation for direct commercial operations in select countries in 2026.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Gross margin is estimated to be approximately 53% to 54% of sales for the full year.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Adjusted EBITDA margin is estimated to be approximately negative 5% of sales for the full year, recast in the second quarter of 2025 from approximately 3%. The change was made to align with views expressed by the staff of the U.S. Securities and Exchange Commission to include an acquired in-process research and development (IPR&D) charge that occurred in the first quarter of 2025, which had an estimated impact of negative 8 percentage points.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Non-cash charges included in cost of goods sold and operating expenses are estimated to be approximately $115 million. This includes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Approximately $95 million non-cash, stock-based compensation expense.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Approximately $20 million depreciation and amortization expense.

------

Exhibit 99.1

**Non-GAAP Financial Measures**

Certain non-GAAP financial measures are presented in this press release to provide information that may assist investors in understanding the Company's financial results and assessing its prospects for future performance. The Company believes these non-GAAP financial measures are important operating performance indicators because they exclude items that are unrelated to, and may not be indicative of, the Company's core operating results. These non-GAAP financial measures, as calculated, may not necessarily be comparable to similarly titled measures of other companies and may not be appropriate measures for comparing the performance of other companies relative to the Company. These non-GAAP financial results are not intended to represent, and should not be considered to be more meaningful measures than, or alternatives to, measures of operating performance as determined in accordance with GAAP. To the extent the Company uses such non-GAAP financial measures in the future, we expect they will be calculated using a consistent method from period to period and, if not, an explanation will be provided. A reconciliation of each of the historical GAAP financial measures to the most directly comparable historical non-GAAP financial measures has been provided in Table D "Reconciliation of GAAP versus Non-GAAP Financial Results" attached to this press release.

In the first quarter of 2025, the Company included an adjustment for IPR&D expense in its non-GAAP financials and provided guidance based on this practice. Beginning in the second quarter of 2025, the Company no longer included an adjustment for IPR&D expense in its non-GAAP results to align with views expressed by the staff of the U.S. Securities and Exchange Commission and 2025 results. The Company's guidance has been revised accordingly.

The accounting treatment for Tandem Choice, which was in effect from September 2022 through December 2024, had a high degree of complexity. When the program originally launched, the Company began deferring a portion of sales for each eligible t:slim X2 pump shipped in the United States. When a customer elected to participate in Tandem Choice upon the launch of Tandem Mobi in 2024, the Company recognized the existing deferral, incremental fees received and the associated costs of providing the new insulin pump at the time of fulfillment. Historical non-GAAP financial measures are presented in this press release to facilitate better comparisons of the Company's operating results across the reporting periods. Tandem Choice will not impact any financial measures for the year ending December 31, 2025.

**Conference Call**

The Company will hold a conference call and simultaneous webcast today at 4:30pm Eastern Time (1:30pm Pacific Time). The link to the webcast will be available by accessing the Events & Presentations tab in the Investor Center of the Tandem Diabetes Care website at http://investor.tandemdiabetes.com, and will be archived for 30 days. To access the call by phone, please use this link (<u>https://register-conf.media-server.com/register/BIc606fdd6dfdd4cec879c519f6530a5c6</u>) and you will be provided with dial-in details, including a personal pin.

**About Tandem Diabetes Care, Inc.** 

Tandem Diabetes Care, a global insulin delivery and diabetes technology company, manufactures and sells advanced automated insulin delivery systems that reduce the burden of diabetes management, while creating new possibilities for patients, their loved ones, and healthcare providers. The Company's pump portfolio features the Tandem Mobi system and the t:slim X2 insulin pump, both of which feature Control-IQ+ advanced hybrid closed-loop technology. Tandem Diabetes Care is headquartered in San Diego, California. For more information, visit <u>tandemdiabetes.com</u>.

Tandem Diabetes Care, the Tandem logo, Control-IQ, Control-IQ+, Tandem Mobi and t:slim X2 are either registered trademarks or trademarks of Tandem Diabetes Care, Inc. in the United States and/or other countries.

------

Exhibit 99.1

**Forward-Looking Statements**

This press release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, that concern matters that involve risks and uncertainties that could cause actual results to differ materially from those anticipated or projected in the forward-looking statements. These forward-looking statements include statements regarding, among other things, the Company's projected financial results and the ability to achieve other operational and commercial goals. The Company's actual results may differ materially from those indicated in these forward-looking statements due to numerous risks and uncertainties. For instance, the Company's ability to achieve projected financial results will be impacted by market acceptance of the Company's products; products marketed and sold or under development by competitors; the Company's ability to establish and sustain operations to support international sales, including expanding into additional geographies; changes in reimbursement rates or insurance coverage for the Company's products; the Company's ability to meet increasing operational and infrastructure requirements from higher customer interest and a larger base of existing customers; the Company's ability to successfully commercialize its products; the Company's ability to develop and launch new products; risks associated with the regulatory approval process outside the United States for new products; the potential that newer products, or other technological breakthroughs for the monitoring, treatment or prevention of diabetes, may render the Company's products obsolete or less desirable, or may otherwise negatively impact the purchasing trends of customers; reliance on third-party relationships, such as outsourcing and supplier arrangements; global economic conditions; and other risks identified in the Company's most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q, and other documents that the Company files with the Securities and Exchange Commission. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release. Tandem undertakes no obligation to update or review any forward-looking statement in this press release because of new information, future events or other factors.

\# \# \#

------

Exhibit 99.1

---

| | | |
|:---|:---|:---|
| **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** |
| **CONDENSED CONSOLIDATED BALANCE SHEETS** | **CONDENSED CONSOLIDATED BALANCE SHEETS** | **CONDENSED CONSOLIDATED BALANCE SHEETS** |
| **Table A** | **Table A** | **Table A** |
| **(in thousands)** | **(in thousands)** | **(in thousands)** |
| | **(Unaudited)** | |
| | **September 30,** | **December 31,** |
|  | **2025** | **2024** |
| **Assets** |  |  |
| Current assets: |  |  |
| Cash, cash equivalents and short-term investments | $319111 | $438329 |
| Accounts receivable, net | 125940 | 114585 |
| Inventories | 137284 | 149612 |
| Other current assets | 34609 | 21965 |
| Total current assets | 616944 | 724491 |
| Property and equipment, net | 77920 | 78150 |
| Operating lease right-of-use assets | 98364 | 85306 |
| Equity method investment | 64904 | 74545 |
| Other long-term assets | 16521 | 5166 |
| Total assets | $874653 | $967658 |
| **Liabilities and Stockholders' Equity** |  |  |
| Current liabilities: |  |  |
| Accounts payable, accrued expenses and employee-related liabilities | $124475 | $127028 |
| Current portion of convertible senior notes, net |  | 40670 |
| Operating lease liabilities | 21341 | 18208 |
| Deferred revenue | 9844 | 11831 |
| Other current liabilities | 96882 | 49312 |
| Total current liabilities | 252542 | 247049 |
| Convertible senior notes, net - long-term | 309590 | 308266 |
| Operating lease liabilities - long-term | 118353 | 106421 |
| Deferred revenue - long-term | 8823 | 10455 |
| Other long-term liabilities | 52380 | 32369 |
| Total liabilities | 741688 | 704560 |
| Total stockholders' equity | 132965 | 263098 |
| Total liabilities and stockholders' equity | $874653 | $967658 |

---

------

Exhibit 99.1

---

| | | | | |
|:---|:---|:---|:---|:---|
| **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** |
| **CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS** | **CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS** | **CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS** | **CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS** | **CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS** |
| **Table B** | **Table B** | **Table B** | **Table B** | **Table B** |
| **(in thousands, except per share data)** | **(in thousands, except per share data)** | **(in thousands, except per share data)** | **(in thousands, except per share data)** | **(in thousands, except per share data)** |
| **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** |
| | **Three Months Ended September 30,** | **Three Months Ended September 30,** | **Nine Months Ended September 30,** | **Nine Months Ended September 30,** |
|  | **2025** | **2024** | **2025** | **2024** |
| Sales | $249253 | $243971 | $724353 | $657555 |
| Cost of sales | 114961 | 119318 | 345799 | 325436 |
| Gross profit | 134292 | 124653 | 378554 | 332119 |
| Operating expenses: |  |  |  |  |
| Selling, general and administrative | 108440 | 99639 | 331889 | 283987 |
| Litigation and settlement expense |  |  | 19951 |  |
| Research and development | 48715 | 51107 | 147048 | 146677 |
| Acquired in-process research and development expenses |  |  | 75217 |  |
| Total operating expenses | 157155 | 150746 | 574105 | 430664 |
| Operating loss | (22863) | (26093) | (195551) | (98545) |
| Total other income (expense), net | (2280) | 3479 | (9403) | 6659 |
| Loss before income taxes | (25143) | (22614) | (204954) | (91886) |
| Income tax expense (benefit) | (3978) | 637 | (833) | 4894 |
| Net loss | $(21165) | $(23251) | $(204121) | $(96780) |
| Net loss per share - basic and diluted | $(0.31) | $(0.35) | $(3.04) | $(1.48) |
| Weighted average shares used to compute basic and diluted net loss per share | 67652 | 65538 | 67040 | 65287 |

---

------

Exhibit 99.1

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** |
| **SALES BY GEOGRAPHY** | **SALES BY GEOGRAPHY** | **SALES BY GEOGRAPHY** | **SALES BY GEOGRAPHY** | **SALES BY GEOGRAPHY** | **SALES BY GEOGRAPHY** | **SALES BY GEOGRAPHY** |
| **Table C**<sup>(1)</sup> | **Table C**<sup>(1)</sup> | **Table C**<sup>(1)</sup> | **Table C**<sup>(1)</sup> | **Table C**<sup>(1)</sup> | **Table C**<sup>(1)</sup> | **Table C**<sup>(1)</sup> |
| **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** |
| ***($'s in thousands)*** | **Three Months Ended September 30,** | **Three Months Ended September 30,** | | **Nine Months Ended<br>September 30,** | **Nine Months Ended<br>September 30,** | |
|  | **2025** | **2024** | **% Change** | **2025** | **2024** | **% Change** |
| United States: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Pump | $84785 | $86722 | (2)% | $242393 | $230187 | 5% |
| &nbsp;&nbsp;&nbsp;Supplies and other | 90846 | 83889 | 8% | 254079 | 227888 | 11% |
| &nbsp;&nbsp;&nbsp;Adjustment for Tandem Choice |  | 1039 | (100)% |  | 47 | (100)% |
| Total GAAP Sales in the United States | $175631 | $171650 | 2% | $496472 | $458122 | 8% |
| &nbsp;&nbsp;Adjustment for Tandem Choice |  | (1039) | 100% |  | (47) | 100% |
| Total Non-GAAP Sales in the United States | $175631 | $170611 | 3% | $496472 | $458075 | 8% |
| Outside the United States: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Pump | $25329 | $28077 | (10)% | $81683 | $79774 | 2% |
| &nbsp;&nbsp;&nbsp;Supplies and other | 48293 | 44244 | 9% | 146198 | 119659 | 22% |
| Total Sales Outside the United States | $73622 | $72321 | 2% | $227881 | $199433 | 14% |
| Total GAAP Worldwide Sales | $249253 | $243971 | 2% | $724353 | $657555 | 10% |
| &nbsp;&nbsp;Adjustment for Tandem Choice |  | (1039) | 100% |  | (47) | 100% |
| Total Non-GAAP Worldwide Sales | $249253 | $242932 | 3% | $724353 | $657508 | 10% |

---

&nbsp;&nbsp;&nbsp;&nbsp;(1) The Tandem Choice program concluded in 2024, and there was no impact to sales for this program in 2025. A reconciliation of non-GAAP financial measures to their closest GAAP equivalent and additional information can be found in Table D and under the heading "Non-GAAP Financial Measures."

------

Exhibit 99.1

---

| | | | | |
|:---|:---|:---|:---|:---|
| **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** | **TANDEM DIABETES CARE, INC.** |
| **Reconciliation of GAAP versus Non-GAAP Financial Results** | **Reconciliation of GAAP versus Non-GAAP Financial Results** | **Reconciliation of GAAP versus Non-GAAP Financial Results** | **Reconciliation of GAAP versus Non-GAAP Financial Results** | **Reconciliation of GAAP versus Non-GAAP Financial Results** |
| **Table D** | **Table D** | **Table D** | **Table D** | **Table D** |
| **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** | **(Unaudited)** |
| ***($'s in thousands)*** | **Three Months Ended September 30,** | **Three Months Ended September 30,** | **Nine Months Ended September 30,** | **Nine Months Ended September 30,** |
|  | **2025** | **2024** | **2025**<sup>(4)</sup> | **2024** |
| GAAP sales | $249253 | $243971 | $724353 | $657555 |
| &nbsp;&nbsp;&nbsp;Adjustment for Tandem Choice <sup>(1)</sup> |  | (1039) |  | (47) |
| Non-GAAP sales | $249253 | $242932 | $724353 | $657508 |
| GAAP gross profit | $134292 | $124653 | $378554 | $332119 |
| &nbsp;&nbsp;&nbsp;Adjustment for Tandem Choice<sup>(1)</sup> |  | (374) |  | 645 |
| Non-GAAP gross profit | $134292 | $124279 | $378554 | $332764 |
| GAAP gross margin<sup>(2)</sup> | 54% | 51% | 52% | 51% |
| Non-GAAP gross margin<sup>(2)</sup> | 54% | 51% | 52% | 51% |
| GAAP operating loss | $(22863) | $(26093) | $(195551) | $(98545) |
| &nbsp;&nbsp;&nbsp;&nbsp;Litigation and settlement expense |  |  | 19951 |  |
| &nbsp;&nbsp;&nbsp;Non-recurring facility impairment and restructuring costs<sup>(3)</sup> |  |  | 11167 |  |
| &nbsp;&nbsp;&nbsp;Adjustment for Tandem Choice<sup>(1)</sup> |  | (374) |  | 645 |
| Non-GAAP operating loss | $(22863) | $(26467) | $(164433) | $(97900) |
| GAAP operating margin<sup>(2)</sup> | (9)% | (11)% | (27)% | (15)% |
| Non-GAAP operating margin<sup>(2)</sup> | (9)% | (11)% | (23)% | (15)% |
| GAAP net loss | $(21165) | $(23251) | $(204121) | $(96780) |
| &nbsp;&nbsp;&nbsp;Income tax expense | (3978) | 637 | (833) | 4894 |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest income, interest expense and other, net | 2280 | (3479) | 9403 | (6659) |
| &nbsp;&nbsp;&nbsp;&nbsp;Depreciation and amortization | 4493 | 4211 | 13171 | 12362 |
| &nbsp;&nbsp;&nbsp;&nbsp;Litigation and settlement expense |  |  | 19951 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Stock-based compensation expense | 21141 | 26281 | 72271 | 73217 |
| &nbsp;&nbsp;&nbsp;Non-recurring facility impairment and restructuring costs<sup>(3)</sup> |  |  | 11167 |  |
| &nbsp;&nbsp;&nbsp;Adjustment for Tandem Choice<sup>(1)</sup> |  | (374) |  | 645 |
| Adjusted EBITDA | $2771 | $4025 | $(78991) | $(12321) |
| Adjusted EBITDA margin<sup>(2)</sup> | 1% | 2% | (11)% | (2)% |
| GAAP net loss | $(21165) | $(23251) | $(204121) | $(96780) |
| &nbsp;&nbsp;&nbsp;&nbsp;Litigation and settlement expense |  |  | 19951 |  |
| &nbsp;&nbsp;&nbsp;Non-recurring facility impairment and restructuring costs<sup>(3)</sup> |  |  | 11167 |  |
| &nbsp;&nbsp;&nbsp;Adjustment for Tandem Choice<sup>(1)</sup> |  | (374) |  | 645 |
| Non-GAAP net loss | $(21165) | $(23625) | $(173003) | $(96135) |
| GAAP cash provided by (used in) operating activities | $8264 | $26781 | $(19510) | $13508 |
| &nbsp;&nbsp;&nbsp;&nbsp;Less: capital expenditures | (4092) | (5239) | (13263) | (16162) |
| Non-GAAP free cash flow <sup>(5)</sup> | $4172 | $21542 | $(32773) | $(2654) |

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(1) The accounting treatment for Tandem Choice had a high degree of complexity. The Tandem Choice program concluded in 2024, and there was no impact to sales for this program in 2025. Additional information can be found under the heading "Non-GAAP Financial Measures."

(2) GAAP margins including GAAP gross margin and GAAP operating margin are calculated using GAAP sales. Non-GAAP margins including non-GAAP gross margin, non-GAAP operating margin, and adjusted EBITDA margin are calculated using non-GAAP sales.

(3) In the first quarter of 2025, the Company recorded $11.2 million in impairment charges related to its operating lease right-of-use assets, and severance and other restructuring costs associated with the relocation of certain research and development activities.

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Exhibit 99.1

(4) In the first quarter of 2025, the Company included an adjustment for IPR&D expense in its non-GAAP financials and provided guidance based on this practice. Beginning in the second quarter of 2025, the Company no longer included an adjustment for IPR&D expense in its non-GAAP results to align with views expressed by the staff of the U.S. Securities and Exchange Commission and 2025 results and guidance have been revised accordingly.

(5) Free Cash Flow is a non-GAAP financial measure that we define as cash provided by operating activities less capital expenditures.