Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Financial Statement Presentation The financial statements include the unaudited condensed consolidated balance sheets, statements of operations, statements of comprehensive income, statements of changes in stockholders’ equity, and statements of cash flows of Waystar and its subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The accompanying unaudited condensed consolidated financial statements and notes have been prepared in accordance with GAAP and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of our financial position, results of operations, changes in stockholders’ equity and cash flows. The results of operations for the six months ended June 30, 2026 are not necessarily indicative of the results for the full year or the results for any future periods. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2025 in the Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 17, 2026 (the “2025 Annual Report”). Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting periods. Significant estimates and assumptions are used for, but are not limited to: (1) revenue recognition, including estimated expected customer life; (2) recoverability of accounts receivable and taxes receivable; (3) impairment assessment of goodwill and long-lived intangible assets; (4) fair value of intangibles acquired in business combinations; (5) litigation reserves; (6) depreciation and amortization; (7) fair value of stock options issued to employees and assumed as part of business combinations; (8) fair value of interest rate swaps; and (9) leases, including incremental borrowing rate. Future events and their effects cannot be predicted with certainty, and accordingly, accounting estimates require the exercise of judgment. We evaluate and update assumptions and estimates on an ongoing basis and may employ outside experts to assist in evaluations. Actual results could differ from the estimates used. Revenue Recognition We derive revenue primarily from providing access to our solutions for use in the healthcare industry and in doing so generate two types of revenue: (i) subscription revenue and (ii) volume-based revenue, which account for 99% of total revenue for all periods presented. We also derive revenue from implementation fees for our software, as well as hardware sales to facilitate patient payments. We recognize revenue in accordance with Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”), through the following five steps: •identification of the contract, or contracts, with a client; •identification of the performance obligations in the contract; •determination of the transaction price; •allocation of the transaction price to the performance obligations in the contract; and •recognition of revenue when, or as, we satisfy a performance obligation Our customers, referred to as clients elsewhere in this report, represent healthcare providers across all types of care settings, including physician practices, clinics, surgical centers, and laboratories, as well as large hospitals and health systems. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The length of our contracts varies but is typically two to three years and generally renew automatically for successive one-year terms. Our revenue is reported net of applicable sales and use tax and is recognized as, or when, control of these services or products are transferred to clients, in an amount that reflects the consideration we expect to be entitled to in exchange for the contract’s performance obligations. Revenue from our subscription services as well as from our volume-based services represents a single promise to provide continuous access (i.e., a stand-ready obligation) to our software solutions in the form of a service. Our software products are made available to our clients via a cloud-based, hosted platform where our clients do not have the right or practical ability to take possession of the software. As each day of providing access to the software solutions is substantially the same and the client simultaneously receives and consumes the benefits as services are provided, these services are viewed as a single performance obligation comprised of a series of distinct daily services. Revenue from our subscription services is recognized over time on a ratable basis over the contract term beginning on the date that the service is made available to the client. Volume-based services are priced based on transaction, dollar volume or provider count in a given period. Given the nature of the promise is based on unknown quantities or outcomes of services to be performed over the contract term, the volume-based fee is determined to be variable consideration. The volume-based transaction fees are recognized each day using a time-elapsed output method based on the volume or transaction count at the time the clients’ transactions are processed. Our other services are generally related to implementation activities across all solutions and hardware sales to facilitate patient payments. Implementation services are not considered performance obligations as they do not provide a distinct service to clients without the use of our software solutions. As such, implementation fees related to our solutions are billed upfront and recognized ratably over the contract term. Implementation fees and hardware sales represent less than 1% of total revenue for all periods presented. Our contracts with clients typically include various combinations of our software solutions. Determining whether such software solutions are considered distinct performance obligations that should be accounted for separately versus together requires significant judgment. Specifically, judgment is required to determine whether access to our SaaS solutions is distinct from other services and solutions included in an arrangement. We follow the requirements of ASC 606-10-55-36 through -40, Revenue from Contracts with Customers, Principal Agent Considerations, in determining the gross versus net revenue presentations for our performance obligations in the contract with a client. Revenue recorded where we act in the capacity of a principal is reported on a gross basis equal to the full amount of consideration to which we expect in exchange for the good or service transferred. Revenue recorded where we act in the capacity of an agent is reported on a net basis, exclusive of any consideration provided to the principal party in the transaction. The principal versus agent evaluation is a matter of judgment that depends on the facts and circumstances of the arrangement and is dependent on whether we control the good or service before it is transferred to the client or whether we are acting as an agent of a third party. This evaluation is performed separately for each performance obligation identified. For the majority of our contracts, we are considered the principal in the transaction with the client and recognize revenue gross of any related channel partner fees or costs. We have certain agency arrangements where third parties control the goods or services provided to a client and we recognize revenue net of any fees owed to these third parties. Payment terms and conditions vary by contract type, although our standard payment terms generally require payment within 30 to 60 days. In instances where the timing of revenue recognition differs from the timing of payment, we have determined our contracts do not generally include a significant financing component. The primary purpose of our invoicing terms is to provide clients with simplified and predictable ways of purchasing our products and services, not to receive financing from our clients or to provide clients with financing. Contract Costs Incremental Costs of Obtaining a Contract Incremental costs of obtaining a contract primarily include commissions paid to our internal sales personnel. We consider all such commissions to be both incremental and recoverable since they are only paid when a contract is secured. These capitalized costs are amortized on a straight-line basis over the expected period of benefit, which is determined based on the average customer life, which includes anticipated renewals of contracts. As of June 30, 2026 and December 31, 2025, the total unamortized costs reported as deferred costs on our balance sheet amounted to $39.5 million and $32.4 million, respectively, for internal sales commissions. For the three months ended June 30, 2026 and 2025, amortization related to the sales commission asset was $3.9 million and $3.2 million, respectively. For the six months ended June 30, 2026 and 2025, amortization related to the sales commission asset was $7.5 million and $6.3 million, respectively. The aforementioned amortization amounts are included in sales and marketing in our consolidated statements of operations. Costs to Fulfill a Contract We capitalize costs incurred to fulfill contracts that i) relate directly to the contract, ii) are expected to generate resources that will be used to satisfy performance obligations under the contract, and iii) are expected to be recovered through revenue generated under the contract. Costs incurred to implement clients on our solutions (e.g., direct labor) are capitalized and amortized on a straight-line basis over the estimated customer life if we expect to recover those costs. As of June 30, 2026 and December 31, 2025, the total unamortized costs reported as deferred costs on our balance sheet amounted to $65.3 million and $61.6 million, respectively, for fulfillment costs. For the three months ended June 30, 2026 and 2025, amortization related to the fulfillment cost asset was $4.7 million and $3.9 million, respectively. For the six months ended June 30, 2026 and 2025, amortization related to the fulfillment cost asset was $9.3 million and $7.6 million, respectively. The aforementioned amortization amounts are included in the costs of revenue in our consolidated statements of operations. There were no impairment losses relating to deferred costs during the periods presented. Channel Partners We account for fees paid to channel partners within sales and marketing expenses in the accompanying statements of operations. For the three months ended June 30, 2026 and 2025, we recorded fees to all channel partners of $22.0 million and $19.0 million, respectively. For the six months ended June 30, 2026 and 2025, we recorded fees to all channel partners of $43.5 million and $37.3 million, respectively. As we are primarily responsible for contracting with and fulfilling contracts for the end user, we record revenue gross of related channel partner fees. Cash and cash equivalents We consider highly liquid investments with an original maturity of three months or less to be cash equivalents. We maintain our cash in bank deposit accounts, which, at times, may exceed federally insured limits. We have not experienced any credit losses in such accounts. Investment securities Our short-term investments, which consist of debt securities, are stated at fair value. These debt securities have been categorized as available-for-sale and classified as current assets given their maturity date is 12 months or less. Unrealized holding gains and losses for debt securities, net of applicable deferred taxes, are included in other comprehensive income or loss as a component of stockholders’ equity until realized from a sale or an expected credit loss is recognized. For the purpose of determining realized gross gains and losses for debt securities sold, that are included as a component of interest income/(expense) in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. We recorded $1.4 million and $0.5 million of interest income on investment securities for the three months ended June 30, 2026 and 2025, respectively, within “Interest expense, net” of our statements of operations. We recorded $2.1 million and $0.6 million of interest income on investment securities for the six months ended June 30, 2026 and 2025, respectively, within “Other expense” of our statements of operations. Under the current expected credit losses model expected losses on available-for-sale debt securities are recognized through an allowance for credit losses rather than as reductions in the amortized cost of securities. For debt securities whose fair value is less than their amortized cost which we do not intend to sell or are not required to sell, we evaluate the expected cash flows to be received as compared to amortized cost and determine if an expected credit loss has occurred. In the event of any expected credit loss, only the amount of impairment associated with the expected credit loss is recognized in income with the remainder, if any, of the loss recognized in other comprehensive income. To the extent we have the intent to sell the debt security, or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value. There were no impairment losses relating to our investment securities during the periods presented. Recently Issued Accounting Pronouncements Not Yet Adopted In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, “Disaggregation of Income Statement Expenses.” The standard is intended to benefit investors by providing more detailed information about expenses that is critically important in understanding an entity’s performance, assessing an entity’s prospects for future cash flows, and comparing an entity’s performance over time and with that of other entities. For public business entities, this ASU will be effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments in this ASU should be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to any or all prior periods presented in the financial statements. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements. In September 2025, the FASB issued ASU 2025-06, “Targeted Improvements to the Accounting for Internal-Use Software” to modernize the accounting guidance for the costs to develop software for internal use. The new guidance amends the existing standard that refers to various stages of a software development project to align better with current software development methods, such as agile programming. The new guidance will be effective for all entities for annual periods beginning after December 15, 2027. The guidance can be applied on a fully prospective basis, a modified basis for in-process projects, or a full retrospective basis. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements. In November 2025, the FASB issued ASU 2025-09, “Hedge Accounting Improvements,” which is an update to ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” Consistent with the original objective of ASU 2017-12, the objective of this ASU is to more closely align hedge accounting with the economics of an entity's risk management activity. The amendments included in the five issues addressed in this ASU are intended to better reflect those strategies in financial reporting by enabling entities to achieve and maintain hedge accounting for highly effective economic hedges of forecasted transactions. For public companies, the new guidance will be effective for annual reporting periods beginning after December 15, 2026, and interim periods within those annual reporting periods. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements. In December 2025, the FASB issued ASU 2025-11, an update to improve the guidance in Topic 270, Interim Reporting, by improving the navigability of the required interim disclosures and clarifying when that guidance is applicable. For public companies, the update is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements.

The financial statements include the unaudited condensed consolidated balance sheets, statements of operations, statements of comprehensive income, statements of changes in stockholders’ equity, and statements of cash flows of Waystar and its subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

The accompanying unaudited condensed consolidated financial statements and notes have been prepared in accordance with GAAP and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of our financial position, results of operations, changes in stockholders’ equity and cash flows. The results of operations for the six months ended June 30, 2026 are not necessarily indicative of the results for the full year or the results for any future periods. These unaudited condensed consolidated financial statements

should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2025 in the Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 17, 2026 (the “2025 Annual Report”).

The preparation of the consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting periods. Significant estimates and assumptions are used for, but are not limited to: (1) revenue recognition, including estimated expected customer life; (2) recoverability of accounts receivable and taxes receivable; (3) impairment assessment of goodwill and long-lived intangible assets; (4) fair value of intangibles acquired in business combinations; (5) litigation reserves; (6) depreciation and amortization; (7) fair value of stock options issued to employees and assumed as part of business combinations; (8) fair value of interest rate swaps; and (9) leases, including incremental borrowing rate. Future events and their effects cannot be predicted with certainty, and accordingly, accounting estimates require the exercise of judgment. We evaluate and update assumptions and estimates on an ongoing basis and may employ outside experts to assist in evaluations. Actual results could differ from the estimates used.

We derive revenue primarily from providing access to our solutions for use in the healthcare industry and in doing so generate two types of revenue: (i) subscription revenue and (ii) volume-based revenue, which account for 99% of total revenue for all periods presented. We also derive revenue from implementation fees for our software, as well as hardware sales to facilitate patient payments.

We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The length of our contracts varies but is typically two to three years and generally renew automatically for successive one-year terms. Our revenue is reported net of applicable sales and use tax and is recognized as, or when, control of these services or products are transferred to clients, in an amount that reflects the consideration we expect to be entitled to in exchange for the contract’s performance obligations.

Revenue from our subscription services as well as from our volume-based services represents a single promise to provide continuous access (i.e., a stand-ready obligation) to our software solutions in the form of a service. Our software products are made available to our clients via a cloud-based, hosted platform where our clients do not have the right or practical ability to take possession of the software. As each day of providing access to the software solutions is substantially the same and the client simultaneously receives and consumes the benefits as services are provided, these services are viewed as a single performance obligation comprised of a series of distinct daily services.

Revenue from our subscription services is recognized over time on a ratable basis over the contract term beginning on the date that the service is made available to the client. Volume-based services are priced based on transaction, dollar volume or provider count in a given period. Given the nature of the promise is based on unknown quantities or outcomes of services to be performed over the contract term, the volume-based fee is determined to be variable consideration. The

Our other services are generally related to implementation activities across all solutions and hardware sales to facilitate patient payments. Implementation services are not considered performance obligations as they do not provide a distinct service to clients without the use of our software solutions. As such, implementation fees related to our solutions are billed upfront and recognized ratably over the contract term. Implementation fees and hardware sales represent less than 1% of total revenue for all periods presented.

Our contracts with clients typically include various combinations of our software solutions. Determining whether such software solutions are considered distinct performance obligations that should be accounted for separately versus together requires significant judgment. Specifically, judgment is required to determine whether access to our SaaS solutions is distinct from other services and solutions included in an arrangement.

We follow the requirements of ASC 606-10-55-36 through -40, Revenue from Contracts with Customers, Principal Agent Considerations, in determining the gross versus net revenue presentations for our performance obligations in the contract with a client. Revenue recorded where we act in the capacity of a principal is reported on a gross basis equal to the full amount of consideration to which we expect in exchange for the good or service transferred. Revenue recorded where we act in the capacity of an agent is reported on a net basis, exclusive of any consideration provided to the principal party in the transaction.

The principal versus agent evaluation is a matter of judgment that depends on the facts and circumstances of the arrangement and is dependent on whether we control the good or service before it is transferred to the client or whether we are acting as an agent of a third party. This evaluation is performed separately for each performance obligation identified. For the majority of our contracts, we are considered the principal in the transaction with the client and recognize revenue gross of any related channel partner fees or costs. We have certain agency arrangements where third parties control the goods or services provided to a client and we recognize revenue net of any fees owed to these third parties.

Payment terms and conditions vary by contract type, although our standard payment terms generally require payment within 30 to 60 days. In instances where the timing of revenue recognition differs from the timing of payment, we have determined our contracts do not generally include a significant financing component. The primary purpose of our invoicing terms is to provide clients with simplified and predictable ways of purchasing our products and services, not to receive financing from our clients or to provide clients with financing.

Incremental costs of obtaining a contract primarily include commissions paid to our internal sales personnel. We consider all such commissions to be both incremental and recoverable since they are only paid when a contract is secured. These capitalized costs are amortized on a straight-line basis over the expected period of benefit, which is determined based on the average customer life, which includes anticipated renewals of contracts. As of June 30, 2026 and December 31, 2025, the total unamortized costs reported as deferred costs on our balance sheet amounted to $39.5 million and $32.4 million, respectively, for internal sales commissions. For the three months ended June 30, 2026 and 2025, amortization related to the sales commission asset was $3.9 million and $3.2 million, respectively. For the six months ended June 30, 2026 and 2025, amortization related to the sales commission asset was $7.5 million and $6.3 million, respectively. The aforementioned amortization amounts are included in sales and marketing in our consolidated statements of operations.

We capitalize costs incurred to fulfill contracts that i) relate directly to the contract, ii) are expected to generate resources that will be used to satisfy performance obligations under the contract, and iii) are expected to be recovered through revenue generated under the contract. Costs incurred to implement clients on our solutions (e.g., direct labor) are capitalized and amortized on a straight-line basis over the estimated customer life if we expect to recover those costs. As of June 30, 2026 and December 31, 2025, the total unamortized costs reported as deferred costs on our balance sheet amounted to $65.3 million and $61.6 million, respectively, for fulfillment costs. For the three months ended June 30, 2026

and 2025, amortization related to the fulfillment cost asset was $4.7 million and $3.9 million, respectively. For the six months ended June 30, 2026 and 2025, amortization related to the fulfillment cost asset was $9.3 million and $7.6 million, respectively. The aforementioned amortization amounts are included in the costs of revenue in our consolidated statements of operations.

We account for fees paid to channel partners within sales and marketing expenses in the accompanying statements of operations. For the three months ended June 30, 2026 and 2025, we recorded fees to all channel partners of $22.0 million and $19.0 million, respectively. For the six months ended June 30, 2026 and 2025, we recorded fees to all channel partners of $43.5 million and $37.3 million, respectively. As we are primarily responsible for contracting with and fulfilling contracts for the end user, we record revenue gross of related channel partner fees.

We consider highly liquid investments with an original maturity of three months or less to be cash equivalents. We maintain our cash in bank deposit accounts, which, at times, may exceed federally insured limits. We have not experienced any credit losses in such accounts.

Our short-term investments, which consist of debt securities, are stated at fair value. These debt securities have been categorized as available-for-sale and classified as current assets given their maturity date is 12 months or less. Unrealized holding gains and losses for debt securities, net of applicable deferred taxes, are included in other comprehensive income or loss as a component of stockholders’ equity until realized from a sale or an expected credit loss is recognized. For the purpose of determining realized gross gains and losses for debt securities sold, that are included as a component of interest income/(expense) in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. We recorded $1.4 million and $0.5 million of interest income on investment securities for the three months ended June 30, 2026 and 2025, respectively, within “Interest expense, net” of our statements of operations. We recorded $2.1 million and $0.6 million of interest income on investment securities for the six months ended June 30, 2026 and 2025, respectively, within “Other expense” of our statements of operations.

Under the current expected credit losses model expected losses on available-for-sale debt securities are recognized through an allowance for credit losses rather than as reductions in the amortized cost of securities. For debt securities whose fair value is less than their amortized cost which we do not intend to sell or are not required to sell, we evaluate the expected cash flows to be received as compared to amortized cost and determine if an expected credit loss has occurred. In the event of any expected credit loss, only the amount of impairment associated with the expected credit loss is recognized in income with the remainder, if any, of the loss recognized in other comprehensive income. To the extent we have the intent to sell the debt security, or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value.

In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, “Disaggregation of Income Statement Expenses.” The standard is intended to benefit investors by providing more detailed information about expenses that is critically important in understanding an entity’s performance, assessing an entity’s prospects for future cash flows, and comparing an entity’s performance over time and with that of other entities. For public business entities, this ASU will be effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments in this

ASU should be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to any or all prior periods presented in the financial statements. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements.

In September 2025, the FASB issued ASU 2025-06, “Targeted Improvements to the Accounting for Internal-Use Software” to modernize the accounting guidance for the costs to develop software for internal use. The new guidance amends the existing standard that refers to various stages of a software development project to align better with current software development methods, such as agile programming. The new guidance will be effective for all entities for annual periods beginning after December 15, 2027. The guidance can be applied on a fully prospective basis, a modified basis for in-process projects, or a full retrospective basis. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements.

In November 2025, the FASB issued ASU 2025-09, “Hedge Accounting Improvements,” which is an update to ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” Consistent with the original objective of ASU 2017-12, the objective of this ASU is to more closely align hedge accounting with the economics of an entity's risk management activity. The amendments included in the five issues addressed in this ASU are intended to better reflect those strategies in financial reporting by enabling entities to achieve and maintain hedge accounting for highly effective economic hedges of forecasted transactions. For public companies, the new guidance will be effective for annual reporting periods beginning after December 15, 2026, and interim periods within those annual reporting periods. We are currently evaluating the effect of the adoption of this amendment on our consolidated financial statements.