Description of business and summary of significant accounting policies (Policies)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Basis of presentation

Basis of presentation and consolidation

We prepared the accompanying consolidated financial statements in accordance with generally accepted accounting principles in the United States ("GAAP").

Consolidation

We have eliminated all intercompany balances and transactions.

Reclassifications

Reclassifications

We have reclassified certain amounts in prior periods to conform with current presentation.

Use of estimates

Use of estimates

Preparing our consolidated financial statements in conformity with GAAP requires us to make estimates and judgments that affect amounts reported in the consolidated financial statements and accompanying notes. We base these estimates and judgments on historical experience and various other assumptions that we consider reasonable. GAAP requires us to make estimates and assumptions in several areas, including the fair values of financial instruments, assets acquired and liabilities assumed through business combinations, share-based awards, and contingencies, the recognition, measurement and valuation of deferred income taxes, the useful lives of our intangible assets and property and equipment, the incremental borrowing rate we use to determine our operating lease liabilities, and revenue recognition, among others. Actual results could differ materially from these estimates and judgments.

Segments

Segments

We operate as a single operating segment. Our chief operating decision maker is our Chief Executive Officer ("CEO"), who reviews financial information presented on a consolidated basis, accompanied by disaggregated information about our revenue, for purposes of making operating decisions, assessing financial performance and allocating resources. Net income (loss) is our primary measure of profit or loss, and all costs and expenses categories on our consolidated statements of operations, as well as share-based compensation expense, are significant. Refer to Note 8 for additional information about our share-based compensation expense. Our other segment items include interest income (expense), net, other income (expense), net and provision for (benefit from) income taxes on our consolidated statements of operations.

Revenue recognition and Cost of revenue

Revenue recognition

We generate revenue by delivering ads on our website and mobile application. We recognize revenue only after transferring control of promised goods or services to customers, which occurs when a user clicks on an ad contracted on a cost per click ("CPC") basis, views an ad contracted on a cost per thousand impressions ("CPM") or cost per day ("CPD") basis or views a video ad contracted on a cost per view ("CPV") basis. We recognize revenue over the service period for ads contracted on a CPD basis, which do not contain minimum impression guarantees. We typically bill customers on a CPC, CPM, CPV, or CPD basis, and our payment terms vary by customer type and location. The term between billing and payment due dates is not significant.

We recognize revenue only after satisfying our contractual performance obligations. We occasionally offer customers free ad inventory. When contracts with our customers contain multiple performance obligations, we allocate the overall transaction price, which is the amount of consideration to which we expect to be entitled in exchange for promised goods or services, to each of the distinct performance obligations based on their relative standalone selling prices. We generally determine standalone selling prices based on the effective price charged per contracted click, impression or view, and we

do not disclose the value of unsatisfied performance obligations because the original expected duration of our contracts is generally less than one year.

For revenue generated from arrangements that involve third parties, we evaluate whether it is appropriate to recognize revenue on a gross or net basis based upon which party obtains control of the specified goods or services before they are transferred to the customer. In making this determination we consider the party primarily responsible for fulfillment, inventory risk, and discretion in establishing price.

Certain customers may receive incentives or credits, which are accounted for as variable consideration. We estimate these amounts and reduce revenue based on the amounts expected to be provided to customers. We believe that there will not be significant changes to our estimates of variable consideration for the periods presented.

We record sales commissions in sales and marketing as incurred because we would amortize these over a period of less than one year.

Cost of revenue

Cost of revenue consists primarily of expenses associated with the delivery of our service, including the cost of hosting our website and mobile application. Cost of revenue also includes personnel-related expense, including salaries, benefits and share-based compensation for employees on our operations teams, payments associated with partner arrangements, credit card and other transaction processing fees, amortization of acquired intangible assets and allocated facilities and other supporting overhead costs.

Share-based compensation

Share-based compensation

Restricted stock units ("RSUs"), restricted stock awards ("RSAs") and stock options granted under our 2019 Omnibus Incentive Plan (the "2019 Plan") are generally subject only to a service condition. We also grant awards subject to performance or market conditions to certain executives from time to time. We record share-based compensation expense over the requisite service period, which is typically two to four years, on a straight-line basis for awards subject only to a service condition and on a graded-vesting basis for awards subject to performance or market conditions. We account for forfeitures as they occur.

We measure RSUs and RSAs based on the fair market value of our common stock on the grant date, stock options based on their estimated grant date fair values, which we determine using the Black-Scholes option-pricing model and awards with a market condition using a Monte Carlo simulation valuation model.

Income taxes

Income taxes

We account for income taxes using the asset and liability method. We recognize deferred tax assets and liabilities for temporary differences between the financial reporting and tax bases of assets and liabilities using the enacted statutory tax rates in effect for the years in which we expect the differences to reverse. We establish valuation allowances to reduce the total deferred tax assets to the amount we believe is more likely than not to be realized. In assessing the need for a valuation allowance, we consider all available evidence, both positive and negative, including past operating results and estimates of future taxable income. In the event that we change our determination as to the amount of deferred tax assets that can be realized, we will adjust our valuation allowance with a corresponding impact to the provision for (benefit from) income taxes in the period in which such determination is made.

We recognize tax benefits from uncertain tax positions when we believe it is more likely than not that the tax position is sustainable on examination by tax authorities based on its technical merits. We recognize taxes on Global Intangible Low-Taxed Income as incurred.

Advertising expenses

Advertising expenses

We record advertising expenses as incurred and include these in sales and marketing in the consolidated statements of operations.

Marketable securities

Marketable securities

We invest in highly liquid corporate debt securities, U.S. treasury securities, asset-backed securities, U.S. government agency securities, municipal securities, non-U.S. government and supranational bonds and certificates of deposit. We classify marketable investments with stated maturities of ninety days or less from the date of purchase as cash equivalents and those with stated maturities greater than ninety days from the date of purchase as marketable securities.

We classify our marketable securities as available-for-sale investments in our current assets because they are available for use to support current operations. We carry our marketable investments at fair value and record unrealized gains or losses, net of taxes, in accumulated other comprehensive income (loss) in stockholders’ equity. We determine realized gains and losses on the sale of marketable investments using a specific identification method and record these and any expected credit losses in other income (expense), net.

Fair value measurements

Fair value measurements

We account for certain assets and liabilities at fair value, which is the amount we believe market participants would be willing to receive to sell an asset or pay to transfer a liability in an orderly transaction. We categorize these assets and liabilities into the three levels below based on the degree to which the inputs we use to measure their fair values are observable in active markets. We use the most observable inputs available to us when measuring fair value.

•Level 1: Observable inputs such as quoted prices for identical assets or liabilities in active markets

•Level 2: Observable inputs such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, or inputs that are derived principally from or corroborated by observable market data or other means

•Level 3: Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities

Accounts receivable, net of allowances

Accounts receivable, net of allowances

We record accounts receivable at the original invoiced amount. We maintain an allowance for credit losses for any receivables we may be unable to collect. We estimate uncollectible receivables based on our receivables’ age, our customers’ credit quality and current economic conditions, among other factors that may affect our customers’ ability to pay. We also maintain an allowance for sales credits, which we determine based on historical credits issued to customers. We include the allowances for credit losses and sales credits in accounts receivable, net in the consolidated balance sheets.

Property and equipment

Property and equipment

We carry property and equipment at cost less accumulated depreciation and calculate depreciation using the straight-line method over our assets’ estimated useful lives, which are generally:

Property and Equipment	Useful Life
Computer and network equipment	3 years
Furniture and fixtures	4 years
Leasehold improvements	Lesser of 10 years or remaining lease term

Leases and operating lease incremental borrowing rate

Leases and operating lease incremental borrowing rate

We lease office space under operating leases with expiration dates through 2036. We determine whether an arrangement constitutes a lease at inception and record lease liabilities and right-of-use assets on our consolidated balance sheets at lease commencement. We measure lease liabilities based on the present value of the total lease payments not yet paid discounted based on the more readily determinable of the rate implicit in the lease or our incremental borrowing rate, which is the estimated rate we would be required to pay for a collateralized borrowing equal to the total lease payments over the term of the lease. We estimate our incremental borrowing rate based on an analysis of publicly traded debt securities of companies with credit and financial profiles similar to our own. We measure right-of-use assets based on the corresponding lease liability adjusted for (i) payments made to the lessor at or before the commencement date, (ii) initial direct costs we incur and (iii) tenant incentives under the lease. We begin recognizing rent expense when the lessor makes the underlying asset available to us, we do not assume renewals or early terminations unless we are reasonably certain to exercise these options at commencement and we do not allocate consideration between lease and non-lease components.

For short-term leases, we record rent expense in our consolidated statements of operations on a straight-line basis over the lease term and record variable lease payments as incurred.

Business combinations

Business combinations

We include the results of operations of businesses that we acquire in our consolidated financial statements beginning on their respective acquisition dates. We allocate the fair value of the purchase consideration to the assets acquired and liabilities assumed based on their estimated fair values. When the fair value of the purchase consideration exceeds the fair values of the identifiable assets and liabilities acquired, we record the excess as goodwill. Our estimates of fair value are based on assumptions we believe to be reasonable but which are inherently uncertain and unpredictable, and as a result, actual results may differ from estimates. During the measurement period, which is up to one year from the acquisition date, we may record adjustments to the assets and liabilities acquired with the corresponding offset to goodwill. Any adjustments after the measurement period are reflected in our consolidated statements of operations.

Long-lived assets, including goodwill and intangible assets

Long-lived assets, including goodwill and intangible assets

We record definite-lived intangible assets at fair value less accumulated amortization. We calculate amortization using the straight-line method over the assets’ estimated useful lives of up to ten years.

We review our property and equipment, operating lease right-of-use assets and intangible assets for impairment whenever events or circumstances indicate that an asset’s carrying value may not be recoverable. We measure recoverability by comparing an asset’s carrying value to the future undiscounted cash flows that we expect it to generate. If this test indicates that the asset’s carrying value is not recoverable, we record an impairment charge to reduce the asset’s carrying value to its fair value.

We recorded $117.3 million of impairment and abandonment charges for operating lease right-of-use assets and leasehold improvements as part of the restructuring plan for the year ended December 31, 2023. We did not record any other material property and equipment or intangible asset impairments during the periods presented.

We review goodwill for impairment at least annually or more frequently if current circumstances or events indicate that the fair value of our single reporting unit may be less than its carrying value. We did not record any goodwill impairment during the periods presented.

Website development costs

Website development costs

We capitalize costs to develop our website and mobile application when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. Due to the iterative process by which we perform upgrades and the relatively short duration of our development projects, development costs meeting our capitalization criteria were not material during the periods presented.

Loss contingencies

Loss contingencies

We are involved in various lawsuits, claims and proceedings that arise in the ordinary course of business. We record a liability for these when we believe it is probable that we have incurred a loss and can reasonably estimate the loss. We regularly evaluate current information to determine whether we should adjust a recorded liability or record a new one.

Foreign currency

Foreign currency

The functional currency of our international subsidiaries is generally their local currency. We translate our subsidiaries’ financial statements into U.S. dollars using month-end exchange rates for assets and liabilities and rates that approximate those in effect during the period for revenue and costs and expenses. We record translation gains and losses in accumulated other comprehensive income (loss) in stockholders’ equity. We record foreign exchange transaction gains and losses in other income (expense), net. Our net foreign exchange gains and losses were not material for the periods presented.

Concentration of business risk

Concentration of business risk

We have an agreement with Amazon Web Services (“AWS”) to provide the cloud computing infrastructure we use to host our website, mobile application and many of the internal tools we use to operate our business. We are currently required to maintain a substantial majority of our monthly usage of certain compute, storage, data transfer and other services on

AWS. Any transition of the cloud services currently provided by AWS to another cloud services provider would be difficult to implement and would cause us to incur significant time and expense.

Concentration of credit risk

Concentration of credit risk

Financial instruments that may potentially expose us to concentrations of credit risk primarily consist of cash, cash equivalents, marketable securities and restricted cash. Our investment policy is meant to preserve capital and maintain liquidity. The policy limits our marketable investments to investment-grade securities and limits our credit exposure by limiting our concentration in any one corporate issuer or sector and by establishing a minimum credit rating for marketable investments we purchase. Although we deposit cash and marketable investments with multiple financial institutions, our deposits may exceed insurable limits.

Credit losses on accounts receivable

Our accounts receivable are generally unsecured. We monitor our customers’ credit quality on an ongoing basis and maintain reserves for estimated credit losses.

Recently Adopted Accounting Pronouncements and Not Yet Adopted

Recently Adopted Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. We adopted ASU 2023-09 prospectively as of January 1, 2025, and the effects of adoption on our consolidated financial statements were not material. Refer to Note 10 to our consolidated financial statements for further information.

Recent Accounting Pronouncements Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (subtopic 220-40), which requires disclosure of disaggregation of certain relevant expenses included in the statements of operations on an annual and interim basis. ASU 2024-03 will be effective for our annual periods beginning January 1, 2027 and interim periods beginning January 1, 2028. The amendments may be applied prospectively or retrospectively, and early adoption is permitted. We are currently evaluating the effects of adoption on our consolidated financial statements.

In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40), which amends certain aspects of the accounting for and disclosure of software costs. ASU 2025-06 will be effective for us beginning January 1, 2028. The amendments may be applied using a prospective, retrospective, or modified transition approach, and early adoption is permitted. We are currently evaluating the effects of adoption on our consolidated financial statements