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Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Significant Accounting Policies | Note 2. Significant Accounting Policies Basis of Presentation The accompanying Consolidated Financial Statements and Notes to Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP") and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission regarding annual financial reporting on Form 10-K. The Company’s fiscal year is the twelve-month period from January 1 through December 31, and all references to "2025," "2024," and "2023," refer to the fiscal year unless otherwise noted. Certain amounts in the prior years’ Consolidated Financial Statements have been reclassified to conform to the current year’s presentation. Use of Estimates The preparation of the Consolidated Financial Statements and Notes to Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the dates of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during each fiscal year. Such estimates include, but are not limited to, revenue recognition, valuation of inventory, valuation and impairment of goodwill, intangible and other long-lived assets, valuation of acquired assets and assumed liabilities from acquisitions, valuation of contingent liabilities, recoverability of deferred tax assets, and stock-based compensation expense. The Company bases its estimates on historical experience, known trends, worldwide economic conditions, both general and specific to the life sciences industry, and other relevant factors it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates and changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates. Principles of Consolidation The Consolidated Financial Statements include the accounts of Quanterix and its wholly-owned subsidiaries. All intercompany transactions have been eliminated in consolidation. Business Combinations The Company accounts for business combinations in accordance with the acquisition method of accounting under ASC 805 - Business Combinations ("ASC 805"). The acquisition method of accounting requires the Company to record the acquired assets and liabilities, including identifiable intangibles, at their estimated fair values as of the acquisition date, with any excess of the consideration transferred recorded to goodwill. Goodwill is not amortized; however it is required to be tested for impairment at least annually at the reporting unit level. If the initial accounting for a business combination is incomplete by the end of a reporting period that falls within a measurement period (not to exceed a year from the date of acquisition), the Company records preliminary amounts. During the measurement period, the Company adjusts the preliminary amounts to reflect new information obtained about facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date. The Company records these adjustments to the preliminary amounts with a corresponding offset to goodwill. Any adjustments identified after the measurement period are recorded in the Consolidated Statements of Operations. Acquired intangible assets consist of definite and indefinite-lived intangible assets, including developed technology, customer relationships, know-how, and in process research and development ("IPR&D"). Definite-lived intangible assets are amortized on a straight-line basis over each asset’s estimated useful life. The Company accounts for IPR&D as an indefinite-lived intangible asset until the underlying project is completed. Upon completion, the IPR&D asset is accounted for as a finite-lived intangible asset. For customer contracts acquired in an acquisition, the Company reassesses them under ASC 606 - Revenue from Contracts with Customers ("ASC 606") as if it had originated the contract, including assessing differences from the Company’s revenue policies and estimates. As part of this reassessment, under ASC 805, the Company elected the practical expedient to reflect the aggregate effect of all modifications that occurred before the acquisition date. Differences from these reassessments, if any, are recorded as contract assets or deferred revenue. Additionally, the Company assesses acquired customer contracts for off-market terms and records an additional asset or liability for favorable or unfavorable terms. Off-market assets or liabilities are recorded at their estimated fair values as of the acquisition date based on the economic returns that could have been achieved by a market participant in a market transaction. Refer to Note 3 - Acquisitions for discussion of the Company's 2025 acquisitions. Foreign Currency The functional currency of the Company’s subsidiaries is generally their respective local currencies. These subsidiary financial statements are translated into U.S. dollars using the period-end exchange rates for assets and liabilities, average exchange rates during the corresponding period for revenue and expenses, and historical rates for equity. The effects of foreign currency translation adjustments are recorded in accumulated other comprehensive income (loss), a component of stockholders’ equity on the Consolidated Balance Sheets. Revenue from Contracts with Customers The Company generates the majority of its revenues from contracts with customers and accounts for them pursuant to ASC 606. Refer to the section titled "Grant Revenue" below for discussion the Company’s accounting policy for revenue generated from grant awards. For contracts with customers, the Company recognizes revenue when a customer obtains control of promised products or services, for an amount that reflects the consideration expected to be received in exchange for those products or services. The Company follows the five step revenue model prescribed by ASC 606 to determine revenue recognition: (i) identify the contract(s) with a customer; (ii) identify the performance obligation(s) in the contract; (iii) determine the transaction price, including variable consideration, if any; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. Revenues are presented net of any sales, value added, or similar taxes collected from customers and remitted to the government. The Company accounts for a contract when it has approval and commitment from both parties, the fees, payment terms, and rights of the parties regarding the products or services to be transferred are identified, the contract has commercial substance, and it is probable that substantially all of the consideration for the products and services expected to be transferred is collectible. The Company applies judgment in determining the customer’s ability and intention to pay for services expected to be transferred, which is based on factors including the customer’s payment history, management’s ability to mitigate exposure to credit risk (for example, requiring payment in advance of the transfer of products or services, or the ability to stop transferring promised products or services in the event a customer fails to pay consideration when due), and experience selling to similarly situated customers. The Company’s contracts may include either a single promise (referred to as a performance obligation) to transfer a product or service, or a combination of multiple promises to transfer products or services. The Company evaluates the existence of multiple promises within its contracts by using judgment to determine if (1) the customer can benefit from each contractual promise on its own or together with readily available resources and (2) the transfer of each contractual promise is separately identifiable from other promises in a contract. When both criteria are met, each promise is accounted for as a separate performance obligation. Additionally, the Company has elected the practical expedient under ASC 606 to account for shipping and handling as an activity to fulfill a promise to transfer a product, and therefore does not evaluate whether shipping and handling activities are promised services to its customers. Contracts that include rights to additional products or services that are exercisable at a customer’s discretion are generally considered options. The Company assesses if these options provide a material right to the customer and if so, the material right is considered a performance obligation. The identification of material rights requires judgment to determine the value of the option to purchase additional products and services in relation to options that may be provided to, and prices paid by, customers in the normal course of business. Material rights are recognized when exercised by a customer or upon expiration of the right. The Company determines the transaction price of its contracts based on the amount of consideration it expects to be entitled to, which is generally equal to the contract amount. In some cases, contracts contain variable consideration which primarily relates to (1) sales and usage-based royalties related to the license of intellectual property and (2) contracts with minimum purchase commitments. For sales and usage-based royalties, ASC 606 provides an exception to estimating variable consideration. Under this exception, the Company recognizes revenues from sales or usage-based royalty revenue at the later of when the sales or usage occurs or the satisfaction (or partial satisfaction) of the performance obligation to which the royalty has been allocated. All other variable amounts are constrained to the minimum guaranteed contract amount so that a reversal of cumulative revenue does not occur in future periods. Once there is no longer uncertainty over a variable amount, any incremental fees the Company is entitled to are allocated to the related performance obligation(s). For contracts that contain multiple performance obligations, the Company allocates the transaction price among the performance obligations on a relative basis according to their standalone selling prices ("SSP"). Determining the SSP for performance obligations requires judgment and is based on factors including prices charged to customers in observable transactions, internal pricing objectives and list prices, pricing of similar products, expected costs to manufacture the Company's products, and estimated margins. The Company has more than one range of standalone selling prices for certain products and services based on the geographic location of customers and sales channel. Product Revenue The Company’s product revenues are composed of instruments, assay kits, replacement parts, instrument installation fees, and other consumables such as reagents and antibodies. Products are sold directly to customers and are also sold through distributors in EMEA and Asia Pacific regions. Direct instrument sales include installation and an initial year service-type warranty. The Company has determined that the instrument and installation are a combined performance obligation in cases where a customer has a contractual acceptance right that applies through the installation of the instrument. The included service-type warranty is considered a separate performance obligation since a customer could benefit from it independently with readily available resources and is capable of being sold on its own (with such warranty recorded in services and other revenue on the Consolidated Statements of Operations). Sales of instruments to distributors include a license to import and resell the instruments. The Company has determined these distributor licenses are part of a combined performance obligation with the instrument as the distributor only benefits from the combination of the instrument and ability to resell it. Instrument sales may also be bundled with assays and other consumables, training, and/or an extended service warranty, each of which is considered a separate performance obligation. Product revenues for direct instrument sales to customers are recognized when the related performance obligation(s) are satisfied (i.e. when transfer of control of the instrument passes to the customer). For direct instrument sales that require installation prior to contractual acceptance, the combined performance obligation is recognized upon completion of the instrument’s installation. For direct instrument sales that do not contain contractual acceptance and instrument sales to distributors, the instrument performance obligation is recognized based on the agreed upon shipping terms (either upon shipment or delivery) as that is when control of the product passes to the customer. When installation is a separate performance obligation, it is recognized upon completion. Service Revenue Service revenues are composed of contract research services, initial year of service-type warranties, extended services warranty contracts, repair services, and other services such as training. Contract research services are provided through the Company’s Accelerator Laboratory and generally consist of fixed fee contracts. Revenues from contract research services are generally recognized over time, using an output method based on the number of completed test results, since the work performed does not have an alternative use and the contracts allow for the collection of transaction consideration for costs incurred plus a reasonable margin through the period of performance. For performance obligations that are not recognized over time, they are recognized at the point in time when the Company completes and delivers its research results on each individually completed study. Revenues from warranties and service contracts are recognized ratably over the contract service period since the customer simultaneously receives and benefits from the services. Collaboration and License Revenue Collaboration and license revenues are composed of revenue associated with licensing the Company’s technology, intellectual property, and know-how associated with the Company's instruments to third parties and for related services. License arrangements consist of sales or usage-based fees and/or future royalties. Revenues are recognized at the point in time the license is delivered as the underlying license is considered functional intellectual property since the customer has the right to use it when it is received. Royalty revenues that are sales or usage-based are recognized at the later of when the sales or usage occurs and the satisfaction (or partial satisfaction) of the performance obligation to which the royalty has been allocated. Contract Assets and Liabilities Accounts Receivable and Allowance for Credit Losses Accounts receivable represent rights to consideration in exchange for products or services that have been transferred by the Company, when payment is unconditional and only the passage of time is required before payment is due. Also included in accounts receivable are unbilled amounts resulting from revenue exceeding the amount billed to the customer, where the right to payment is unconditional. If the right to payment for services performed was conditional on something other than the passage of time, the unbilled amount would be recorded as a separate contract asset. Generally, the Company’s contracts are non-cancellable. For contracts that are cancellable by the customer, the Company records accounts receivable only up to the amount of revenue recognized but not yet collected. The Company’s payment terms vary by customer type and location and the products or services offered. Payment from customers is generally required 30 to 90 days from date of satisfaction of the performance obligation. Accounts receivable do not bear interest and the Company does not provide financing arrangements to its customers. The Company is exposed to credit losses primarily through accounts receivable from sales of its products and services. The Company’s expected loss allowance methodology is developed using historical collection experience, current and future economic and market conditions, a review of the current status of customers’ accounts receivable, and management’s ability to mitigate exposure to credit risk. Specific allowance amounts are established to record the appropriate provision for customers that have a higher probability of default. The Company monitors changes to the receivables balance on a timely basis, and balances are written off as they are determined to be uncollectible after collection efforts have been exhausted. Deferred Revenue The Company refers to contract liabilities as deferred revenue on the Consolidated Balance Sheets. Deferred revenue consists of billings in excess of revenue recognized, primarily related to upfront payments for instruments, consumables, service warranties, and laboratory services. Costs to Obtain Contracts The Company capitalizes commissions paid to its sales representatives and related fringe benefit costs that are incremental to obtaining customer contracts. Capitalized commissions are recorded in prepaid expenses and other current assets and other non-current assets on the Consolidated Balance Sheets. These commissions are amortized over the life of the contract and are recorded in cost of goods sold and selling, general and administrative expense on the Consolidated Statements of Operations. The Company has elected the practical expedient allowing commissions with an amortization period of one year or less to be expensed as incurred. Commissions associated with instrument and consumables sales are earned when the related revenue is recognized. Commissions associated contract research services, warranty, and extended service contracts are earned upon booking. The Company evaluates potential impairment of these amounts at each balance sheet date, and no related impairments were recorded during the years ended December 31, 2025, 2024, and 2023. Warranties For instruments sold directly to customers, the Company provides an initial year of service-type warranty and also sells extended warranty contracts for additional periods beyond the initial year. The service-type warranty guarantees that the Company's instruments are free from material defects in workmanship and materials, excluding normal wear and tear, and includes maintenance services. Under ASC 606, the Company concluded that the initial year service-type warranty is a separate performance obligation since a customer could benefit from it independently with readily available resources and it is capable of being sold on its own. The Company recognizes revenue for these service-type warranties ratably over the service period. For products sold to distributors, the Company provides an initial year of assurance-type warranty which guarantees that the products conform to the Company's published specifications. Assurance-type warranties do not create a separate performance obligation under ASC 606. In accordance with ASC Topic 460 – Guarantees, the Company establishes an accrual for estimated assurance-type warranty expense and records the expense in cost of product revenue on the Consolidated Statements of Operations. Amounts recognized for assurance-type warranties during the years ended December 31, 2025, 2024, and 2023 were not material. Grant Revenue Accounting for grants does not fall under ASC 606, as the grantor will not benefit directly from the Company’s expansion or product development, and no products or services are transferred to the grantor. As there is no authoritative guidance under U.S. GAAP on accounting for grants to for profit business entities from government entities, the Company accounts for grants by analogy to International Accounting Standards Topic 20, Accounting for Government Grants and Disclosure of Government Assistance ("IAS 20") and ASC Topic 958, Not for-Profit Entities ("ASC 958"). The decision to account for a grant under IAS 20 or ASC 958 is based on whether the grantor is a government entity. The Company recognizes grant revenue as the Company performs services under the arrangement when the funding is committed and as each grant’s activities are performed. The timing of revenue recognition and receipt of funding varies by grant and can be independent from performance of the related activities, such as an upfront payment of the award value, or subsequent to the Company’s requests for reimbursement for already performed activities (subject to the approval of the granting organization). Cost of Goods Sold and Services Cost of Product Revenue Cost of product revenue consists of manufacturing and assembly costs for instruments, related reagents, other consumables, contract manufacturer costs, personnel costs, allocated overhead, and other direct costs related to product sales. Raw material part costs include inbound shipping and handling costs associated with purchased goods, contract manufacturer costs, personnel costs, overhead and other direct costs related to product sales. Additionally included in cost of product revenue is amortization expense for intangibles that relate to the sale of products and royalty fees due to third parties from revenue generated by collaboration or license deals. Cost of Service and Other Revenue Cost of services and other revenue consists of direct costs associated with operating the Company’s Accelerator Laboratory on behalf of its customers, including raw materials, personnel costs, allocated overhead costs that include facility and other related costs, and other direct costs. Additional costs include costs related to warranties, and other costs of servicing equipment at customer sites. Research and Development Expenses Research and development expense consists primarily of personnel costs, research supplies, third-party development costs for new products, materials for prototypes, quality assurance, amortization expense for intangibles that relate to the development of products, and allocated overhead costs that include facility and other related costs. Selling, General and Administrative Expenses Selling, general and administrative expense consists of personnel costs for our sales and marketing, finance, legal, human resources, and general management teams, shipping and handling for product sales, acquisition related costs, other general and administrative costs, as well as professional services costs, such as marketing, advertising, legal and accounting services, and allocated overhead costs that include facility and other related costs. The classification of shipping and handling costs for product sales varies from company to company with some companies recording these as selling, general and administrative expenses and others recording such expenses within costs of goods sold for products. To the extent the classification of the Company's shipping and handling costs differs from the reporting approach used by other companies, the Company’s gross margins may not be comparable with those reported by such other companies. Net Loss Per Share Basic net loss per common share attributable to common stockholders is calculated by dividing the loss attributable to common stockholders by the weighted-average number of common shares outstanding. Diluted net loss per common share attributable to common stockholders is calculated under the treasury stock method by dividing the loss attributable to common stockholders by the diluted weighted-average number of common shares outstanding. Diluted weighted-average shares outstanding reflect the dilutive effect, if any, of potential common shares issued, such as unvested common stock, unvested restricted stock units ("RSUs"), common stock options, and shares estimated to be purchased under the Company’s employee stock purchase plan ("ESPP"). During periods when the Company is in a net loss position, these potential common shares are excluded from the diluted net loss per common share attributable to common stockholders because their effect would be anti-dilutive. Accordingly, basic and diluted net loss per common share attributable to common stockholders were the same for all periods presented. Cash and Cash Equivalents Cash and cash equivalents consist of cash deposits and short-term, highly liquid marketable securities that are readily convertible into cash with original maturities of three months or less at the time of purchase. Cash and cash equivalents consist of the following (in thousands):
| As of December 31,
| 2025 |  | 2024
Cash | $ | 12,620 |  |  | $ | 12,283 |
Money market funds | 17,219 |  |  | 44,426 |
Total cash and cash equivalents | $ | 29,839 |  |  | $ | 56,709 |
Restricted Cash The following table summarizes the period ending cash and cash equivalents as presented on the Consolidated Balance Sheets and the total cash, cash equivalents, and restricted cash as presented on the Consolidated Statements of Cash Flows (in thousands):
| As of December 31,
| 2025 |  | 2024
Cash and cash equivalents | $ | 29,839 |  |  | $ | 56,709 |
Restricted cash | 3,341 |  |  | 2,610 |
Cash, cash equivalents, and restricted cash | $ | 33,180 |  |  | $ | 59,319 |
Restricted cash consists of collateral for letters of credit issued as security for several of the Company’s leased facilities and to secure the Company’s corporate credit card program. The short-term or long-term classification is determined in accordance with the expiration of the underlying letter of credit and security. Marketable Securities The Company’s current portfolio of marketable securities is entirely debt securities and may at any time include commercial paper, U.S. Treasuries, corporate notes and bonds, U.S. Government agency bonds, certificates of deposit, and similar types of debt securities. Marketable debt securities with original maturities of three months or less at the time of purchase are recorded in cash and cash equivalents on the Consolidated Balance Sheets as they are considered highly liquid and readily convertible into cash. All other marketable securities, including those with maturities beyond one year, are recorded as current assets on the Consolidated Balance Sheets based on their highly liquid nature and because such securities are available for use in current operations. The Company classifies its marketable securities as either held to maturity, available-for-sale, or trading at the time of purchase and re-evaluates such classification at each balance sheet date. All of the Company’s marketable securities are currently classified as available-for-sale as it may use them in current operations. Available-for-sale securities are recorded at fair value (refer to Note 8 - Fair Value of Financial Instruments). Unrealized gains and losses (other than impairment or credit related losses) are recorded in accumulated other comprehensive income (loss), a component of stockholders’ equity on the Consolidated Balance Sheets. Realized gains and losses are determined using the specific identification method and are recorded in other income (expense), net on the Consolidated Statements of Operations. At least quarterly, the Company monitors its marketable securities for impairment. In the event a security’s fair value is less than its amortized cost basis, the Company evaluates whether an impairment exists and if the impairment is a result of credit loss or other factors. For a security in an unrealized loss position, if the Company intends to sell the security in an unrealized loss position, or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, an impairment loss equal to the difference between the security’s fair value and amortized cost basis is recorded in other income (expense), net on the Consolidated Statement of Operations. Additionally, the Company determines if a credit loss exists by considering information about the collectability of the security, current market conditions, and the issuer’s financial condition. If a decline in fair value is a result of a credit loss, an allowance for credit losses is recorded in other income (expense), net on the Consolidated Statement of Operations, limited to the portion attributed to the credit loss. The Company presents accrued interest receivable separately from its marketable securities balance and has elected the practical expedient to exclude such amounts from the assessment and measurement of impairment of its marketable securities. Such accrued interest is recorded in prepaid expenses and other current assets on the Consolidated Balance Sheets. Inventory Inventory consists of instruments, assays, and the materials required to manufacture instruments and assays. Inventory is stated at the lower of cost and net realizable value on a first-in, first-out ("FIFO") basis or average cost basis and includes the cost of materials, labor, and manufacturing overhead. The Company analyzes its inventory levels on each reporting date for slow-moving, excess, and obsolete inventory, and inventory expected to expire prior to being used. These analyses require judgment and are based on factors including, but not limited to, recent historical activity, anticipated or forecasted demand for the Company’s products and scientific data supporting the estimated life of materials that expire. If the Company identifies adverse conditions exist, such as unfavorable changes in estimated customer demand, the lives of materials that expire, or actual market conditions that may differ from its projections, the carrying value of the inventory is reduced to its estimated net realizable value. Property and Equipment Property and equipment, including leasehold improvements, are stated at cost, net of accumulated depreciation. These assets are depreciated over their estimated useful lives using the straight-line method. Expenditures for maintenance and repairs are charged to expense as incurred, whereas significant expenditures that extend the useful lives of existing assets are capitalized as additions to property and equipment. Depreciation is calculated based upon the following estimated useful lives:
| Estimated Useful Life
Laboratory and manufacturing equipment | 5 years
Demo inventory | 3 years
Furniture and fixtures | 7 years
Computers and software | 3 years
Leasehold improvements | Shorter of asset's life or remaining lease term
The Company develops and modifies internal use software supporting the Company’s operations. Certain costs incurred during the application development stage including external direct costs of services used in the development or internal personnel costs for employees directly associated with the development, are capitalized and are recorded in property and equipment on the Consolidated Balance Sheets. The Company begins depreciating these costs over the life of the related asset upon completion of a working model or when it is ready for its intended use. Costs incurred during the preliminary project stage and post-configuration stages are expensed as incurred. The Company also develops software related to the operation of some of its instruments. which is accounted for under ASC 985 - Costs of Software to Be Sold, Leased, or Marketed. The Company capitalizes certain costs incurred after the software reaches technological feasibility and amortizes it once the software is available to customers. The Company did not incur any such costs during the year ended December 31, 2025. Cloud Computing Costs For cloud computing arrangements that include a software license or software-as-a-service contracts, certain implementation costs incurred are capitalized and recorded in prepaid expenses and other current assets and other non-current assets on the Consolidated Balance Sheets. Once the software is ready for its intended use, the capitalized costs are amortized over the noncancellable term of the cloud computing service contract, plus any optional renewal periods that are reasonably certain to be exercised. Leases The Company primarily enters into operating leases for office, laboratory, manufacturing spaces, and office equipment, and determines whether an arrangement is a lease at inception of the arrangement. The Company accounts for a lease when it has the right to control the leased asset for a period of time, while obtaining substantially all of the assets’ economic benefits. Leases are recorded on the Consolidated Balance Sheets as operating lease right-of-use ("ROU") assets and current and non-current operating lease liabilities. Operating lease ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of the future minimum lease payments over the lease term and any initial direct costs incurred. Initial direct costs are incremental costs of a lease that would not have been incurred had the lease not been executed. The discount rate used to determine the present value of the lease payments is the Company’s incremental borrowing rate on a collateralized basis for a similar term and amount, as generally an implicit rate in the lease is not readily determinable. To estimate its incremental borrowing rate, a credit rating applicable to the Company is estimated using a synthetic credit rating analysis since the Company does not currently have an agency-based credit rating. The Company’s lease agreements can contain lease and non-lease components. The Company accounts for the lease and fixed payments for non-lease components as a single lease component under ASC 842 – Leases, which increases the amount of the ROU assets and lease liabilities. Most of the Company’s lease agreements also contain variable payments, primarily maintenance, utility, and other-related costs, which are not included in the measurement of the ROU assets and lease liabilities and are expensed as incurred. Some of the Company’s leases contain options to extend or terminate the lease. When determining the lease term, these options are included in the measurement and recognition of the Company’s ROU assets and lease liabilities when it is reasonably certain that the Company will exercise the option(s). The Company considers various economic factors when making this determination, including, but not limited to, the significance of leasehold improvements incurred in the leased space, the difficulty in replacing the asset, underlying contractual obligations, and specific characteristics unique to a particular lease. Subsequent to entering into a lease arrangement, the Company reassesses the certainty of exercising options to extend or terminate a lease. When it becomes reasonably certain that the Company will exercise an option that was not included in the lease term, the Company accounts for the change in circumstances as a lease modification, which results in the remeasurement of the ROU asset and lease liability as of the modification date. Leases with a term of 12 months or less upon commencement are not recorded on the Consolidated Balance Sheets and are recorded to expense on a straight-line basis over the lease term. Impairment of Goodwill and Indefinite-Lived Intangible Assets The Company assesses goodwill for impairment at the reporting unit level at least annually or whenever events or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. Absent an event that indicates a specific impairment may exist, the Company has selected October 1 as the date for performing its annual goodwill impairment test. A reporting unit is defined as an operating segment or a component of an operating segment to the extent discrete financial information is available that is reviewed by segment management. Prior to the third quarter of 2025, the Company determined it had one reporting unit. After the acquisition of Akoya, the Company determined it had two reporting units, consisting of the legacy Quanterix business and the Akoya business. An impairment assessment requires evaluating a potential impairment using either a qualitative assessment, to determine if it is more likely than not that the fair value of any reporting unit is less than its carrying amount, or a quantitative analysis, to determine and compare the fair value of each reporting unit to its carrying value, or a combination of both. Judgment is required in determining the use of a qualitative or quantitative assessment, as well as in determining a reporting unit’s estimated fair value, as it requires the Company to make estimates of market conditions and operational performance items such as projected financial results, discount rates, control premiums, or valuation multiples for key financial metrics. During the second quarter of 2025, the Company recorded an impairment charge on its goodwill balance related to the acquisition of Emission. Refer to Note 4 - Goodwill & Intangible Assets for further discussion. The Company had no goodwill recorded at December 31, 2024. At least annually or whenever events or circumstances change, the Company assesses whether IPR&D has been abandoned, in which case it would be written off, or if its estimated fair value is below its carrying value, in which case it could be impaired. Impairment of Long-Lived Assets The Company reviews its long-lived assets, including definite lived intangible assets, right of use assets, and property and equipment, for impairment whenever events or circumstances indicate the carrying amount of the asset(s) may not be fully recoverable or that the estimated useful lives may warrant revision. On an ongoing basis, the Company assesses the determination of its asset groups, which primarily focuses on changes in the Company's operating structure, the way in which it expects to deploy its assets, or how the Company intends to recover the cost of its assets. To assess the recoverability of a long-lived asset or asset group, the Company compares the estimated undiscounted future cash flows for the estimated remaining useful life, or estimated lease term, of the asset (or the primary asset in the asset group) to its carrying value. If the undiscounted cash flows are less than the carrying value, the Company estimates the asset's fair value using the future discounted cash flows associated with the use of the asset. To the extent that the discounted cash flows are less than the carrying value, the asset(s) are impaired and written down to their estimated fair value. Significant judgment is required to estimate future cash flows, including, but not limited to, estimates about future revenues, expenses, asset disposal value, expected uses of the asset (group), historical customer retention rates, technology roadmaps, customer awareness, trademark and trade name history, contractual provisions that could limit or extend an asset's useful life, market data, discount rates, and potential sublease opportunities including rent and rent escalation rates, time to sublease, and free rent periods. Refer to Note 15 - Leases for a discussion of operating lease impairment charges recorded in 2025. Fair Value of Financial Instruments The carrying amount reflected on the Consolidated Balance Sheets for cash, restricted cash, accounts receivable, prepaid expenses and other current assets, accounts payable, accrued compensation and benefits, and accrued expenses and other current liabilities approximate their fair values due to their short-term nature. Additionally, the Company has certain financial instruments that are required to be measured at fair value on a recurring basis including cash equivalents, marketable securities, and contingent liabilities. The fair values of these financial instruments are classified as Level 1, 2, or 3 within the fair value hierarchy as follows: •Level 1: Observable inputs based on unadjusted quoted prices in active markets for identical assets. •Level 2: Inputs, other than Level 1 inputs, that are observable either directly or indirectly, such as quoted prices for similar assets, quoted prices in markets that are not active, other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets. •Level 3: Unobservable inputs for which there is little or no market data and such inputs are significant to the fair value of the assets. These inputs reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Income Taxes The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Consolidated Financial Statements or tax returns. Deferred tax assets and liabilities are determined based on differences between the carrying amount and the tax basis of the assets and liabilities using the enacted tax rates in effect in the years in which the differences are expected to reverse. A valuation allowance against deferred tax assets is recorded if, based on the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. On an ongoing basis, the Company reassess the valuation allowance on its deferred tax assets, weighing positive and negative evidence to assess their recoverability. The Company accounts for uncertain tax positions using a more likely than not threshold for recognizing uncertain tax positions, in accordance with ASC 740 – Income Taxes. The evaluation of uncertain tax positions is based on factors that include, but are not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, new audit activity, and changes in facts or circumstances related to a tax position. The Company evaluates uncertain tax positions on an ongoing basis and adjusts any liability recorded to reflect subsequent changes in the relevant facts surrounding the uncertain positions. Amounts recorded for uncertain tax positions, including interest and penalties, are recorded in income tax benefit (expense) on the Consolidated Statement of Operations. Credit, Product, and Supplier Concentrations, and Off-Balance-Sheet Risk Financial instruments that potentially expose the Company to concentrations of credit risk primarily consist of cash, cash equivalents, marketable securities, and accounts receivable. The Company limits its risk exposure by having its cash, cash equivalents, and marketable securities held at large commercial banks and investing in highly rated marketable securities. Maximum exposure to losses related to cash, cash equivalents, marketable securities, and accounts receivable are limited to their carrying amounts. As of both December 31, 2025 and 2024, no customer accounted for greater than 10% of the Company's gross accounts receivable. Customers outside the United States represented 42% and 40% of the Company’s gross accounts receivable balance as of December 31, 2025 and 2024, respectively. For the year ended December 31, 2025 and 2024, no customers accounted for greater than 10% of the Company’s total revenue. For the year ended December 31, 2023, one customer of approximately $14.0 million of revenue accounted for greater than 10% of the Company’s total revenue. The Company is also subject to supply chain risks related to outsourced manufacturing for most of its instruments. Although there are a limited number of manufacturers for its instruments, the Company believes that other suppliers could provide similar manufacturing on comparable terms. A change in suppliers, however, could cause a delay in manufacturing and a possible loss of sales, which would adversely affect operating results. In addition to outsourced manufacturing of some of its instruments, the Company also purchases antibodies through a number of different suppliers. Although a disruption in service from any one of its antibody suppliers is possible, the Company believes that it would be able to find an adequate supply from alternative suppliers. Stock-Based Compensation The Company measures and recognizes stock-based compensation expense by calculating the estimated fair value of stock options, RSUs, or purchase rights issued under the Company’s ESPP on the grant date. The Company generally issues new common shares upon exercise of options and vesting of RSUs. Awards granted by the Company are routine in nature including new hire, annual, and promotion grants. The fair value of stock options and purchase rights under the ESPP is estimated using the Black-Scholes option-pricing model. The Black-Scholes model requires the Company to make assumptions about the expected or contractual term of the option or purchase right, the expected volatility, risk-free interest rates, and expected dividend yield. The Company estimates the expected term of options granted to employees utilizing historical exercise data. The expected term is applied to the stock option grant group as a whole, as the Company does not expect substantially different exercise or post-vesting termination behavior among its employee population. The expected volatility is based on the Company’s historical volatility. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant, commensurate with the expected term. The expected dividend yield is zero as the Company has never paid dividends and has no current plans to pay any dividends on common stock. The fair value of RSUs is determined using the closing market price of the Company’s common stock on the grant date. The Company recognizes stock-based compensation expense on a straight-line basis over an award’s requisite service period, which is the vesting period for stock options and RSUs, and the offering period for purchase rights under the ESPP. The Company recognizes forfeitures as they occur. Restructuring Costs The Company records restructuring charges when a restructuring plan is approved and the amounts to be incurred are estimable. Restructuring costs are comprised of employee separation costs, primarily severance and related benefit payments, and any associated costs related to implementing a restructuring plan to reorganize operations. Refer to Note 19 - Restructuring for further discussion on the restructuring plan implemented during the year ended December 31, 2025. Recent Accounting Pronouncements Recently Adopted Accounting Standards In December 2023, the FASB issued ASC Update No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures ("ASU 2023-09"). This update enhances income tax disclosure requirements by requiring public entities to provide additional information in its tax rate reconciliation and additional disclosures about income taxes paid. The new standard became effective for the Company’s annual financial statements for the period beginning on January 1, 2025. The Company adopted this standard as of January 1, 2025 on a prospective basis and the required disclosures are included in Note 14 - Income Taxes. Recent Accounting Standards To Be Adopted In December 2025, the FASB issued ASC Update No. 2025-12, Codification Improvements. This update provides a variety of language changes and clarity across several topics which are applicable to the Company. The amendments in this update may be applied prospective or retroactively. Additionally, the Company is permitted to elect the transition method for these updates on an issue-by-issue basis. The new standard will be effective for the Company for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. The Company is currently evaluating the impact of adoption of the standard on its Consolidated Financial Statements and related disclosures. In December 2025, the FASB issued ASC Update No. 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements. This update enhances disclosure of an entity's interim disclosure requirements. The amendments in this update can be applied prospectively or retrospectively. The new standard will be effective for the Company for interim reporting periods within annual reporting periods beginning after December 15, 2027. The Company is currently evaluating the impact of adoption of the standard on its Consolidated Financial Statements and related disclosures. In November 2025, the FASB issued ASC Update No. 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities. This update establishes guidance for recognition, measurement and presentation of government grants received by public business entities. The new standard may be applied using a modified prospective approach, modified retrospective approach, or retrospective approach. The new standard will be effective for the Company for annual reporting periods beginning after December 15, 2028 and interim reporting periods within those annual reporting periods. The Company is currently evaluating the impact of adoption of the standard on its Consolidated Financial Statements and related disclosures. In September 2025, the FASB issued ASC No. 2025-06, Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This update enhances disclosure of an entity's internal use software by removing prescriptive and sequential software development stages. The amendments in this update can be applied prospectively or retrospectively. The new standard will be effective for the Company for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods beginning after December 15, 2027. The Company is currently evaluating the impact of adoption of the standard on its Consolidated Financial Statements and related disclosures. In July 2025, the FASB issued ASU No. 2025-05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. This update provides a practical expedient to assume that current conditions as of the balance sheet date will persist through a reasonable and supportable forecast period for eligible assets when estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. The update also allows an entity to make an accounting policy election to consider subsequent collections of balances received after the balance sheet date through a date selected by the entity. The amendments in this update are required to be applied prospectively. The new standard will be effective for the Company for annual and interim reporting periods beginning after December 15, 2025. The Company does not expect that the adoption of this standard will have a material impact on its Consolidated Financial Statements and related disclosures. In November 2024, the FASB issued ASC Update No. 2024-03, Reporting Comprehensive Income (Topic 220): Expense Disaggregation Disclosures. This update enhances disclosure of an entity's expenses, primarily through additional disaggregation of income statement expenses. The update also requires entities to disclose qualitative descriptions of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. The amendments in this update should be applied prospectively, but entities have the option to apply it retrospectively. The new standard will be effective for the Company’s annual reporting periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027.. The Company is currently evaluating the impact that the adoption of this standard will have on its Consolidated Financial Statements and related disclosures.

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