The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities in the Company’s condensed consolidated financial statements and accompanying notes as of the date of the condensed consolidated financial statements. Some of those judgments can be subjective and complex, and therefore, actual results could differ materially from those estimates under different assumptions or conditions.

The Company grants credit to various customers in the ordinary course of business and is paid directly by customers who use its products, distributors and third-party insurance payors. The Company maintains an allowance for its current estimate of expected credit losses. Provisions for expected credit losses are estimated based on historical experience, assessment of specific customer-related risks, review of outstanding invoices, forecasts about the future, and various other assumptions and estimates that are believed to be reasonable under the circumstances, including the impact of broader macroeconomic conditions such as changes in credit risk, discretionary spending, and interest rates. Uncollectible accounts are written off against the allowance after appropriate collection efforts have been exhausted and when it is deemed that a balance is uncollectible.

Operating lease right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized when the Company takes possession of the leased property (the Commencement Date) based on the present value of lease payments over the lease term. For lease agreements that contain lease and non-lease components, the Company accounts for both of those components as a single lease component. Rent expense on noncancelable leases containing known future scheduled rent increases is recorded on a straight-line basis over the term of the respective leases beginning on the Commencement Date. The difference between rent expense and rent paid is accounted for as a component of operating lease right-of-use assets on the Company’s condensed consolidated balance sheets. Landlord improvement allowances and other similar lease incentives are recorded as a reduction of the right-of-use lease assets, and are amortized on a straight-line basis as a reduction to operating lease costs.

Finite-lived intangible assets are recorded at cost, net of accumulated amortization and, if applicable, impairment charges. Amortization of finite-lived intangible assets is recognized over their estimated useful lives using a straight-line or accelerated attribution method, depending on the economic benefit associated with the asset.

In the second quarter 2025, the Company and various Roche entities (collectively, Roche) entered into a Settlement, Mutual Release and Cross-License Agreement (the Settlement Agreement). The Settlement Agreement resolved all actual or potential patent disputes as of the agreement date, including the actions pending before courts of the Unified Patent Court in France and Germany.

Under the terms of the Settlement Agreement, the Company agreed to pay Roche $36.0 million over a four-year period, with an initial cash payment of $8.0 million and four equal annual installments thereafter. Based on a relative fair value approach, $13.3 million was capitalized as an intangible asset for the value of the license, which is being amortized over seven years, reflecting the estimated useful life of the acquired patents. The remaining consideration was expensed as settlement and litigation expense with related legal fees during the second quarter 2025. The Company paid its second annual payment of $7.0 million during the second quarter 2026.

Long-lived assets, such as property and equipment, operating lease right-of-use assets, and acquired intangible assets subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group to be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value. Fair value is determined using unobservable (Level 3) inputs (see Note 5 “Fair Value Measurements”), including discounted cash flow models, future estimated sublease income, and third-party independent appraisals, as considered necessary. There is uncertainty in the projected undiscounted future cash flows used in the Company’s impairment review analysis, which requires the use of estimates and assumptions. If actual performance does not meet or exceed projected performance, or if the assumptions used in the model change in the future, the Company may be required to recognize additional impairment charges in future periods. The Company recognized the impairment of operating lease right-of-use assets in the first quarter of 2025 (see Note 6, “Leases”). There were no other impairments of long-lived assets, including acquired intangible assets, during the three and six months ended June 30, 2026 and 2025.

The Company uses the equity method to account for investments in companies if it owns more than 20% of the investee company’s outstanding equity or the investment provides the Company with the ability to exercise significant influence but not control over the operating and financial policies of the investee. The Company assesses whether it has significant influence by considering various factors, including the nature and magnitude of the investment, voting rights held, and participation in the governance of the investee, if any. The Company may also consider additional relevant factors, such as the presence of other business relationships.

The Company held an equity method investment in CeQur SA (CeQur), a privately held company, of $132.3 million and $60.4 million as of June 30, 2026 and December 31, 2025, respectively. On May 22, 2026, the Company made an additional investment in CeQur of CHF 64.0 million ($81.4 million USD), remaining at an ownership level of less than 50%. The Company continues to account for the investment under the equity method. The additional investment was recorded as an increase to the carrying value of the existing equity method investment. In connection with the additional investment, the Company obtained, for an immaterial amount, the option to acquire the remainder of CeQur’s shares no earlier than 2028 at its sole discretion. In the event the option is exercised, the price to be paid will be calculated using a predetermined market-based formula. The Company recorded this call option in other long-term assets on the condensed consolidated balance sheets. The call option does not meet the criteria for derivative accounting.

The Company’s condensed consolidated net loss included its proportionate share of the net loss of its equity method investee, which was $5.6 million and $9.5 million for the three and six months ended June 30, 2026, respectively, and $3.4 million and $6.9 million for the three and six months ended June 30, 2025, respectively.

Revenue is generated primarily from sales of insulin pumps, single-use insulin cartridges and infusion sets to individual customers with third-party insurance coverage and through a network of distributors that resell the products to insulin-dependent diabetes customers. The Company recognizes revenue when it transfers control of the promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services, net of estimated rebates, prompt payment discounts, and a provision for product returns.

The transaction price is the net consideration to which the Company expects to be entitled, determined from either the stated value in contractual arrangements or the estimated cash to be collected in non-contracted arrangements. The transaction price also includes an estimate of variable consideration at the time of sale. Variable consideration includes, but is not limited to: rebates, prompt payment discounts, and a provision for product returns. These amounts are recorded as a reduction of accounts receivable when no payment is required from the Company and as a liability when a payment is required.

The Company recognizes consideration based on when the performance obligation is satisfied, considering whether or not this occurs at a point in time or over time. Generally, insulin pumps, cartridges, infusion sets, and accessories are deemed performance obligations that are satisfied at a point in time when the customer obtains control of the promised good, which is typically upon shipment or delivery as title transfers. Certain complementary products, such as the Company’s data management and software update platforms, are considered distinct performance obligations that are satisfied over time, as access and support for these products is provided throughout the typical four-year warranty period of the insulin pumps. Accordingly, revenue related to these complementary products is deferred and recognized over the period of the performance obligation according to the agreement.

The Company allocates the transaction price to each individual performance obligation based on the standalone selling price. For the pay-as-you-go reimbursement model, the Company allocates a portion of the transaction price associated with the customer’s initial supply order to the pump based on its relative standalone selling price. When standalone selling prices are not directly observable, the Company estimates such amounts using an expected cost plus a margin approach and allocates any residual consideration to the remaining performance obligations, as appropriate.

The amount of variable consideration that is included in the transaction price is included in revenue only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. The Company is subject to certain rebates on pricing programs with managed care organizations, including pharmacy benefit managers and governmental or third-party commercial payors. The terms of these programs may vary depending on the customer and contractual arrangements. The Company estimates provisions for rebates based on contractual arrangements, estimates of products sold subject to rebate, known market events or trends, and channel inventory data. Sales rebates are recorded as a reduction of revenue and are included within other current or long-term liabilities on the consolidated balance sheets, depending on the anticipated settlement period of the rebate. Actual rebate payments may differ from estimated amounts recorded in the accompanying consolidated financial statements.

The Company records the fair value of derivative instruments as either current assets or current liabilities on the condensed consolidated balance sheets. Changes in the fair value of derivative instruments are recorded each period in current earnings or other comprehensive income (loss), depending on whether a derivative instrument is designated as part of a hedging transaction. For a derivative to qualify as a hedge at inception and throughout the hedged period, the Company formally documents the nature and relationships between the hedging instrument and hedged item.

Gains or losses on cash flow hedges are reclassified from other comprehensive income (loss) to earnings when the hedged transaction occurs and affects consolidated results. Gains or losses on fair value hedges are recognized in earnings immediately and offset against changes in the fair value of the underlying hedged asset, liability, or firm commitment. If the Company determines that a forecasted transaction is no longer probable or no longer qualifies for hedge accounting treatment, the Company discontinues hedge accounting and any related unrealized gain or loss on the derivative instrument is recognized in current earnings.

The Company generally provides a four-year warranty on its insulin pumps to end-user customers and may replace any pumps that do not function as intended in accordance with the product specifications within the warranty period. In addition, the Company offers a six-month warranty on single-use insulin cartridges and infusion sets. Estimated warranty costs are recorded at the time of shipment, and the Company reevaluates the estimate of the warranty reserve obligation at each reporting period. Warranty costs are primarily estimated based on expected replacement rates using historical experience and the expected product replacement cost. Returned insulin pumps may be refurbished and redeployed.

Experience has shown that initial data for any new pump version or pump platform may be insufficient. Therefore, the Company relies on long-term historical replacement data from existing platforms until sufficient data is available. As actual experience accumulates, the Company adjusts its warranty reserve estimate accordingly. In addition, the availability of replacement data may differ by country due to local compliance and privacy regulations, which may require the Company to estimate its warranty liability using available information or data from similar markets. The Company may further adjust the warranty reserve when appropriate, considering revised expectations of product performance based on enhanced hardware, or new features and capabilities that may become available through Tandem Device Updater, a tool that allows Tandem pump users to update their pump software from a personal computer. Warranty expense is recorded as a component of cost of sales in the consolidated statements of operations.


	Three Months Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Balance at beginning of the period	$	55,112	$	52,210	$	55,319	$	51,408
Provision for warranties issued during the period	9,420		9,656		18,148		18,473
Settlements made during the period	(9,767)		(9,308)		(18,702)		(17,699)
Increases in warranty estimates	—		1,645		—		2,021
Balance at end of the period	$	54,765	$	54,203	$	54,765	$	54,203

The Company estimates the fair value of employee purchase rights under the Company’s Employee Stock Purchase Plan (ESPP) using the Black-Scholes option pricing model on the date of grant. The Black-Scholes option pricing model requires the use of assumptions, including stock price volatility, expected term, dividend yield and risk-free interest rate.

The fair value of restricted stock unit (RSU) awards issued under the Company’s stock incentive plans that vest solely based on service, is estimated based on the fair market value of the underlying stock on the date of grant. The fair value of RSU awards that vest based upon predefined Company performance metrics and the awardee’s continuing service through the measurement date is generally estimated based on the fair market value of the underlying stock on the grant date and the estimated probability of achieving the applicable performance conditions. The Company reassesses the probability of achieving such performance conditions each reporting period, and any resulting adjustment to compensation expense is recognized in the period of change. For certain performance-based RSUs with market-based criteria, the Company uses a Monte Carlo methodology to estimate the fair value at the date of grant. With respect to RSU awards with a market condition, the Company recognizes compensation expense ratably over the requisite service period under an award based on the fair market value of the award at the time of grant, regardless of whether the market condition is satisfied. Previously recognized compensation cost would be reversed only if the employee terminated employment before completing the requisite service period.

Basic net loss per share is computed by dividing the net loss by the weighted average number of common shares outstanding for the period, without consideration for common share equivalents. Diluted net loss per share is computed by dividing the net loss by the weighted average number of common shares outstanding, including all potentially dilutive common share equivalents. Dilutive common share equivalents are comprised of stock options and unvested RSUs outstanding under the Company’s stock incentive plans, potential awards to be granted pursuant to the ESPP, and common stock warrants, each calculated using the treasury stock method, and shares issuable upon conversion of the Company’s convertible senior notes calculated using the if-converted method.


	Three Months Ended June 30,		Six Months Ended June 30,
	2026	2025	2026	2025
Options to purchase common stock	80	113	89	114
Unvested restricted stock units	3,266	3,117	2,809	2,734
Warrants to purchase common stock	194	194	194	194
Awards granted under the ESPP	36	54	18	53
Convertible senior notes (if-converted)	17,261	9,159	14,662	9,335
	20,837	12,637	17,772	12,430

In September 2025, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2025-06 Intangibles–Goodwill and Other–Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software (ASU 2025-06), which modernizes the accounting guidance for internal-use software, including website development costs. The amendments eliminate the consideration of software development stages and introduce a new capitalization threshold based on the entity’s commitment to fund the project and the probability of completion. The Company early adopted ASU 2025-06 effective January 1, 2026 using the prospective method. The adoption of ASU 2025-06 did not have a material impact on the Company’s condensed consolidated financial statements.

In November 2024, the FASB issued ASU 2024-03 Income Statement–Reporting Comprehensive Income–Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03), and in January 2025, the FASB issued Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date (ASU 2025-01). ASU 2024-03 requires entities to disclose information about purchases of inventory, employee compensation, and intangible asset amortization in each income statement line item that contains those expenses. ASU 2024-03, as clarified by ASU 2025-01, is effective for the annual reporting period beginning after December 15, 2026 and interim reporting periods within the annual reporting period beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating ASU 2024-03, as clarified by ASU 2025-01, to determine the impact it may have on its consolidated financial statements.

In November 2025, the FASB issued ASU 2025-09 Derivatives and Hedging (Topic 815): Hedge Accounting Improvements (ASU 2025-09). This update is intended to better align hedge accounting with entities’ risk management strategies and simplify application. Key provisions include allowing grouping of forecasted transactions with similar risk exposure, introducing a model for hedging variable-rate debt instruments that permit rate selection, permitting component hedging for certain nonfinancial forecasted transactions, clarifying treatment of certain compound derivatives, and restoring operability for specific dual hedge strategies. ASU 2025-09 is effective for fiscal years beginning after December 15, 2026, including interim periods, with early adoption permitted. The Company is currently evaluating ASU 2025-09 to determine the impact it may have on its consolidated financial statements.

In December 2025, the FASB issued ASU 2025-11 Interim Reporting (Topic 270): Narrow-Scope Improvements (ASU 2025-11), which clarifies and improves the guidance for interim financial reporting. The amendments introduce a disclosure principle requiring entities to disclose events since the end of the previous annual reporting period that materially affect the entity, consolidate a comprehensive list of interim disclosure requirements within ASC 270, and provide guidance on the form and content of condensed interim financial statements. ASU 2025-11 will be effective for interim reporting periods in fiscal years beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating ASU 2025-11 to determine the impact it may have on its consolidated financial statements.