Basis of Presentation	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	NOTE 1. Basis of Presentation The accompanying interim unaudited Condensed Consolidated Financial Statements have been prepared by Onto Innovation Inc. (the “Company,” “Onto Innovation,” “we,” “our” or “us”) and in the opinion of management reflect all adjustments, consisting of normal recurring accruals, necessary for their fair presentation in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). Certain reclassifications have been made to prior-period amounts to conform to current-period presentation. The interim results for the three-month period ended March 31, 2026 are not necessarily indicative of results to be expected for the entire year or any future periods. This interim financial information should be read in conjunction with the financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended January 3, 2026 (the “2025 Form 10-K”) filed with the Securities and Exchange Commission on February 24, 2026. The accompanying Condensed Consolidated Balance Sheet at January 3, 2026 has been derived from the audited consolidated financial statements included in the 2025 Form 10-K. On February 18, 2026, the Board of Directors changed the Company’s fiscal year-end from a 52-53 week fiscal year ending on the Saturday closest to December 31 to a December 31 fiscal year-end. The Company made the fiscal year change on a prospective basis and will not adjust operating results for prior periods. Additionally, the Company has adopted calendar quarter fiscal period ends commencing with the first quarter ended March 31, 2026. The change affects the prior year comparability of the Company’s fiscal quarters in 2025 and will result in shifts in the quarterly periods, which is not expected to have a material impact on our quarterly financial results. Our fiscal year ended January 3, 2026 was a 53-week fiscal year. The first quarter of the fiscal year ended January 3, 2026 ended on March 29, 2025. Throughout this document, the three-month period ended March 31, 2026 represents the quarterly period that commenced on January 4, 2026, the first day of our fiscal year, and ended on March 31, 2026. The three-month period ended March 29, 2025 represents the quarterly period that commenced on December 29, 2024 and ended on March 29, 2025. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Estimates made by management include excess and obsolete inventory, fair value of assets acquired and liabilities assumed in a business combination, recoverability and useful lives of property, plant and equipment and identifiable intangible assets, recoverability of goodwill, recoverability of deferred tax assets, allowance for credit losses, liabilities for product warranty, share-based payments and liabilities for tax uncertainties. Actual results could differ from those estimates. These estimates and assumptions are based on historical experience and on various other factors which the Company believes to be reasonable under the circumstances. The Company may engage third-party valuation specialists to assist with estimates related to the valuation of financial instruments, assets and stock awards associated with various contractual arrangements. Such estimates often require the selection of appropriate valuation methodologies and significant judgment. Actual results could differ from these estimates under different assumptions or circumstances and such differences could be material. Recent Accounting Pronouncements Recently Adopted or Effective In July 2025, the FASB issued ASU 2025-05, “Financial Instruments - Credit Losses (Topic 326),” which simplifies the estimation of credit losses on current accounts receivable and current contract assets arising from transactions accounted for under Accounting Standards Codification 606, Revenue from Contracts with Customers. The guidance allows all entities to use a practical expedient to assume that the current conditions as of the balance sheet date will remain unchanged for the remaining life of the asset when developing a reasonable and supportable forecast as part of estimating expected credit losses on these assets. The guidance is effective for fiscal years beginning after December 15, 2025, and interim periods within those fiscal years. Early adoption is permitted. Entities that elect the practical expedient are required to apply the amendments prospectively. The Company adopted this ASU during the quarter ended March 31, 2026, with no material impact on the condensed consolidated financial statements. Updates Not Yet Effective In December 2025, the FASB issued ASU 2025-11, “Interim Reporting (Topic 270): Narrow-Scope Improvements,” to clarify and reorganize U.S. GAAP interim reporting guidance to improve navigability, applicability, and consistency without changing the fundamental nature or volume of required interim disclosures. This amendment clarifies when ASC 270 is applicable, establishes a disclosure principle requiring disclosure of material events or changes occurring since the most recent annual reporting period, and consolidates into ASC Topic 270 a comprehensive list of interim disclosures required by other Codification Topics. The amendment also clarifies the form and content of interim financial statements, including guidance for condensed interim reporting. The amendment is effective for the Company for interim periods in 2028, with early adoption permitted. The impact of the adoption of the amendments in this update is not expected to be material to the Company’s consolidated financial position and results of operations. In December 2025, the FASB issued ASU 2025‑10, “Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities,” to establish specific guidance for the recognition, measurement, presentation, and disclosure of government grants received to reduce diversity and increase consistency amongst business entities in accounting for such grants. This amendment amends ASC Topic 832 to require that a government grant received by a business entity should not be recognized as income until it is probable that a business entity will comply with the conditions attached to the grant and the grant will be received, with any grant related to an asset to be purchased, constructed or acquired such as long-lived assets or inventory to be recognized on the balance sheet as either deferred income or as an adjustment to the cost basis of the related asset, or the cost accumulation approach, as such costs are incurred. Any grant income or deferred income shall be recognized in earnings on a systematic and rational basis over the periods in which a business entity recognizes as expenses the costs for which the grant is intended to compensate, whereas any grants accounted for using the cost accumulation approach will not have a direct subsequent recognition in earnings, but rather reduced depreciation or amortization in accounting for the related asset. Entities are also required to present grants recognized in earnings separately under other income or deducted from the related expense, and provide disclosures of the nature of the government grant received, the accounting policies used to account for the grant, and the significant terms and conditions of the grant. The amendment is effective for the Company for annual and interim periods in 2029, with early adoption and multiple transition methods permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements. In December 2025, the FASB issued ASU 2025-09, “Derivatives and Hedging (Topic 815): Hedge Accounting Improvements,” to amend certain aspects of its hedge accounting guidance to better reflect an entity’s risk management activities in the financial statements. The guidance expands the hedged risks permitted to be aggregated in a group of individual forecasted transactions and increases the variable price components eligible to be designated as the hedged risk in the forecasted purchase or sale of nonfinancial assets. For public business entities, the provisions of ASU 2025-09 are effective for fiscal years beginning after December 15, 2026. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements. In September 2025, the FASB issued ASU 2025-06, “Intangibles-Goodwill and Other-Internal Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software,” which removes all references to software development stages and clarifies the threshold entities apply to begin capitalizing costs. ASU 2025-06 is effective for annual periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. The ASU may be applied prospectively, retrospectively or through a modified transition approach with early adoption permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements. In November 2024, the FASB issued ASU 2024-03, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40),” which requires additional disclosure of certain costs and expenses, including inventory purchases, employee compensation, selling expense and depreciation expense within the notes to financial statements. The guidance is effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact that the updated standard will have on its financial statements and related disclosures.

The accompanying interim unaudited Condensed Consolidated Financial Statements have been prepared by Onto Innovation Inc. (the “Company,” “Onto Innovation,” “we,” “our” or “us”) and in the opinion of management reflect all adjustments, consisting of normal recurring accruals, necessary for their fair presentation in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). Certain reclassifications have been made to prior-period amounts to conform to current-period presentation. The interim results for the three-month period ended March 31, 2026 are not necessarily indicative of results to be expected for the entire year or any future periods. This interim financial information should be read in conjunction with the financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended January 3, 2026 (the “2025 Form 10-K”) filed with the Securities and Exchange Commission on February 24, 2026. The accompanying Condensed Consolidated Balance Sheet at January 3, 2026 has been derived from the audited consolidated financial statements included in the 2025 Form 10-K.

On February 18, 2026, the Board of Directors changed the Company’s fiscal year-end from a 52-53 week fiscal year ending on the Saturday closest to December 31 to a December 31 fiscal year-end. The Company made the fiscal year change on a prospective basis and will not adjust operating results for prior periods. Additionally, the Company has adopted calendar quarter fiscal period ends commencing with the first quarter ended March 31, 2026. The change affects the prior year comparability of the Company’s fiscal quarters in 2025 and will result in shifts in the quarterly periods, which is not expected to have a material impact on our quarterly financial results. Our fiscal year ended January 3, 2026 was a 53-week fiscal year. The first quarter of the fiscal year ended January 3, 2026 ended on March 29, 2025. Throughout this document, the three-month period ended March 31, 2026 represents the quarterly period that commenced on January 4, 2026, the first day of our fiscal year, and ended on March 31, 2026. The three-month period ended March 29, 2025 represents the quarterly period that commenced on December 29, 2024 and ended on March 29, 2025.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Estimates made by management include excess and obsolete inventory, fair value of assets acquired and liabilities assumed in a business combination, recoverability and useful lives of property, plant and equipment and identifiable intangible assets, recoverability of goodwill, recoverability of deferred tax assets, allowance for credit losses, liabilities for product warranty, share-based payments and liabilities for tax uncertainties. Actual results could differ from those estimates.

These estimates and assumptions are based on historical experience and on various other factors which the Company believes to be reasonable under the circumstances. The Company may engage third-party valuation specialists to assist with estimates related to the valuation of financial instruments, assets and stock awards associated with various contractual arrangements. Such estimates often require the selection of appropriate valuation methodologies and significant judgment. Actual results could differ from these estimates under different assumptions or circumstances and such differences could be material.

Company adopted this ASU during the quarter ended March 31, 2026, with no material impact on the condensed consolidated financial statements.

Updates Not Yet Effective

In December 2025, the FASB issued ASU 2025-11, “Interim Reporting (Topic 270): Narrow-Scope Improvements,” to clarify and reorganize U.S. GAAP interim reporting guidance to improve navigability, applicability, and consistency without changing the fundamental nature or volume of required interim disclosures. This amendment clarifies when ASC 270 is applicable, establishes a disclosure principle requiring disclosure of material events or changes occurring since the most recent annual reporting period, and consolidates into ASC Topic 270 a comprehensive list of interim disclosures required by other Codification Topics. The amendment also clarifies the form and content of interim financial statements, including guidance for condensed interim reporting. The amendment is effective for the Company for interim periods in 2028, with early adoption permitted. The impact of the adoption of the amendments in this update is not expected to be material to the Company’s consolidated financial position and results of operations.

In December 2025, the FASB issued ASU 2025‑10, “Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities,” to establish specific guidance for the recognition, measurement, presentation, and disclosure of government grants received to reduce diversity and increase consistency amongst business entities in accounting for such grants. This amendment amends ASC Topic 832 to require that a government grant received by a business entity should not be recognized as income until it is probable that a business entity will comply with the conditions attached to the grant and the grant will be received, with any grant related to an asset to be purchased, constructed or acquired such as long-lived assets or inventory to be recognized on the balance sheet as either deferred income or as an adjustment to the cost basis of the related asset, or the cost accumulation approach, as such costs are incurred. Any grant income or deferred income shall be recognized in earnings on a systematic and rational basis over the periods in which a business entity recognizes as expenses the costs for which the grant is intended to compensate, whereas any grants accounted for using the cost accumulation approach will not have a direct subsequent recognition in earnings, but rather reduced depreciation or amortization in accounting for the related asset. Entities are also required to present grants recognized in earnings separately under other income or deducted from the related expense, and provide disclosures of the nature of the government grant received, the accounting policies used to account for the grant, and the significant terms and conditions of the grant. The amendment is effective for the Company for annual and interim periods in 2029, with early adoption and multiple transition methods permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements.

In December 2025, the FASB issued ASU 2025-09, “Derivatives and Hedging (Topic 815): Hedge Accounting Improvements,” to amend certain aspects of its hedge accounting guidance to better reflect an entity’s risk management activities in the financial statements. The guidance expands the hedged risks permitted to be aggregated in a group of individual forecasted transactions and increases the variable price components eligible to be designated as the hedged risk in the forecasted purchase or sale of nonfinancial assets. For public business entities, the provisions of ASU 2025-09 are effective for fiscal years beginning after December 15, 2026. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements.

In September 2025, the FASB issued ASU 2025-06, “Intangibles-Goodwill and Other-Internal Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software,” which removes all references to software development stages and clarifies the threshold entities apply to begin capitalizing costs. ASU 2025-06 is effective for annual periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. The ASU may be applied prospectively, retrospectively or through a modified transition approach with early adoption permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements.

In November 2024, the FASB issued ASU 2024-03, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40),” which requires additional disclosure of certain costs and expenses, including inventory purchases, employee compensation, selling expense and depreciation expense within the notes to financial statements. The guidance is effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact that the updated standard will have on its financial statements and related disclosures.