Operations and summary of significant accounting policies	9 Months Ended
Sep. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operations and summary of significant accounting policies	1. Operations and summary of significant accounting policies 1.1. Organization. INNIO N.V. (the “Company,” “INNIO,” or the “Group”), formerly known as INNIO Holding GmbH, is a global provider of distributed power generation equipment and services operating primarily under the Jenbacher and Waukesha brands. Refer to section 1.2 Reorganization, below for further details. The Group designs, manufactures, and services gas-fueled reciprocating engines and related solutions for industrial, commercial, municipal and data center applications, with primary operations in Austria, the United States, and Canada, supported by a worldwide services network. The Group reports financial results through two operating segments: Equipment and Services. 1.The Equipment segment designs, manufactures, and sells new engines, product-related equipment and related solutions addressing data center, power solutions, and compression business lines. 2.The Services segment provides aftermarket services through an engine's lifecycle, including long-term service agreements, spare parts, overhauls, remanufacturing of engines and components, digital solutions, and service-related activities. 1.2. Reorganization. On September 26, 2025, the Company completed a reorganization of its legal entity structure, whereby the accounting predecessor INNIO Group Holding GmbH became an indirect wholly-owned subsidiary of INNIO Holding GmbH. The Reorganization was accounted for as a transaction under common control and reflected prospectively from the date of transfer. See our audited Consolidated Financial Statements for the year ended December 31, 2025, as disclosed in our final prospectus filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, in connection with our IPO (the "Prospectus"). On June 3, 2026, INNIO Holding GmbH was converted, without interruption of its existence as legal entity, from a German limited liability company (Gesellschaft mit beschränkter Haftung) into INNIO Group Holding B.V., a Dutch private company with limited liability (besloten vennootschap met beperkte aansprakelijkheid). Following such conversion, the nominal value of the then 25,000 outstanding common shares in INNIO Group Holding B.V. was reduced to €0.04, and 749,975,000 new common shares were issued to our Principal Shareholder. Thereafter, without interruption of its existence as legal entity, INNIO Group Holding B.V. was converted into a public company under Dutch law (naamloze vennootschap), and our legal name changed to INNIO N.V. Refer to Note 23 – Earnings (loss) per share for more information. 1.3. Basis of presentation. The unaudited Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"), pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) applicable to interim financial statement and present the historical results of operations, comprehensive income (loss) and changes in equity for the three and nine months ended September 30, 2026 and 2025, the financial position as of September 30, 2026 and December 31, 2025 and cash flows for the nine months ended September 30, 2026 and 2025. Certain information related to our significant accounting policies and note disclosures have been condensed or omitted. In the opinion of management, the unaudited Consolidated Financial Statements for the interim periods presented include all adjustments necessary to present a fair statement of the results for such interim periods. These unaudited Consolidated Financial Statements should be read in conjunction with our annual audited Consolidated Financial Statements, related notes and significant accounting policies for the fiscal year ended December 31, 2025, as disclosed in our final prospectus filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, in connection with our IPO (the "Prospectus"). The unaudited Consolidated Financial Statements are presented in millions of U.S. dollars ("USD"), unless otherwise stated. Certain amounts may not sum due to rounding and percentages are calculated based on underlying amounts expressed in millions. Amounts that are non-zero but round to zero at the presented level of precision are shown as "$0.0", whereas amounts with a value of zero are presented as "$—". 1.4. Use of Estimates. The preparation of the unaudited Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates based on assumptions about current, and for certain estimates, future, economic and market conditions that affect reported amounts and related disclosures. These assumptions are deemed to be reasonable under the circumstances and although current estimates contemplate current and expected future conditions, as applicable, it is reasonably possible that actual conditions could differ from expectations, which could materially affect the results of operations, financial position and cash flows. Estimates are used for, but are not limited to, determining the point in time when control transfers to the customer for revenues, contract margins and costs to complete the project when applying the percentage-of-completion method for revenues, recognition and measurement of warranty obligations, impairment assessments of goodwill and indefinite‑lived intangible assets, contingent consideration liabilities, fair‑value measurements, and the recognition and measurement of deferred tax asset valuation allowances. For further information on our significant accounting policies, please refer to our annual audited Consolidated Financial Statements for the fiscal year ended December 31, 2025, filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, in connection with our IPO (the "Prospectus"). 1.5 Equity method investments. Equity method investments represent investments in entities over which the Company has the ability to exercise significant influence, but not control. The initial investments in these entities are recorded at cost and subsequently adjusted for the Company's proportionate share of the investees' net income or losses. Where the Company executes transactions with its equity method investments, its proportionate share in any profits or losses of an equity method investment is eliminated until realization of the related profit and losses by the investee. Dividends received from equity method investees reduce the carrying amount of investment when received and do not impact the Company's earnings. Equity method investments are assessed for other-than-temporary impairment when indicators suggest that its carrying amount may not be recoverable. Investments are presented within Other non-current assets in the consolidated statements of financial position and the Company's share of the results from these investments is reported in consolidated statements of operations within Other (income) expense - net. As of September 30, 2026, the Company's equity method investments balance consists of a 24.9% interest in Nordic (Luxembourg) S.à r.l. ("Nordic LuxCo"). The equity method investment is recognized in Other non-current assets in the consolidated statements of financial position. The loss from equity method investments for the three and nine months ended September 30, 2026 was $1.1 million and $1.9 million, respectively. Refer to Note 26 – Related party transactions and Note 27 – Variable interest entities for further information. 1.6. Recently adopted accounting standards. Financial instruments - Credit losses (ASU 2025-05, Topic 326). In July 2025, the Financial Accounting Standards Board ("FASB") issued ASU 2025-05, which amends ASC 326-20 to provide a practical expedient that current conditions as of the balance sheet date do not change for the remaining life of the asset when estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. Beginning fiscal 2026, the Company adopted ASU 2025-05 and applied the practical expedient, which did not have a material impact on the Consolidated Financial Statements or disclosures. 1.7. Accounting standards issued but not yet adopted. Disaggregation of income statement expenses (ASU 2024-03, Subtopic 220-40). In November 2024, the FASB issued ASU 2024-03, which requires tabular disaggregation of specified natural expense categories (for example, employee compensation, depreciation, amortization of intangibles, and inventory-related costs) that are included in income statement captions such as cost of sales and SG&A. The amendments are effective for annual periods beginning after December 15, 2026 (calendar year 2027), with interim periods beginning after December 15, 2027. The Company is evaluating the impact; no recognition or measurement changes are expected, but note disclosure may expand upon adoption. Derivatives and hedging (ASU 2025‑09, Topic 815). In November 2025, the FASB issued ASU 2025‑09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements, which makes targeted amendments to hedge accounting guidance intended to better align accounting with entities’ risk management activities and to clarify certain aspects of cash flow, fair value, and net investment hedges. The amendments are effective for fiscal years beginning after December 15, 2026 for public business entities and after December 15, 2027 for all other entities, with early adoption permitted. The Company will apply clarifications in the amendments on its hedge accounting policies and strategy; no recognition or measurement changes are expected on adoption. Government grants (ASU 2025-10, Topic 832). In December 2025, the FASB issued ASU 2025-10, which adds guidance to ASC 832 on the recognition, measurement, and presentation of government grants. The amendments are effective for fiscal years beginning after December 15, 2028, with early adoption permitted. The Company is evaluating the impact of these amendments. Environmental Credits and Environmental Credit Obligations (ASU 2026-02, Topic 818). In May 2026, the FASB issued ASU 2026-02, which adds guidance to ASC 818 on the recognition, measurement, presentation and disclosure requirements for all entities that generate, purchase, or receive environmental credits or have a regulatory compliance obligation that may be settled with environmental credits. The amendments are effective for fiscal years beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the impact of these amendments. All other ASUs' issued but not yet adopted were assessed and determined that they either were not applicable or were not expected to have a material impact on our financial statements.

1.1. Organization. INNIO N.V. (the “Company,” “INNIO,” or the “Group”), formerly known as INNIO Holding GmbH, is a global provider of distributed power generation equipment and services operating primarily under the Jenbacher and Waukesha brands. Refer to section 1.2 Reorganization, below for further details. The Group designs, manufactures, and services gas-fueled reciprocating engines and related solutions for industrial, commercial, municipal and data center applications, with primary operations in Austria, the United States, and Canada, supported by a worldwide services network. The Group reports financial results through two operating segments: Equipment and Services.

1.2. Reorganization. On September 26, 2025, the Company completed a reorganization of its legal entity structure, whereby the accounting predecessor INNIO Group Holding GmbH became an indirect wholly-owned subsidiary of INNIO Holding GmbH. The Reorganization was accounted for as a transaction under common control and reflected prospectively from the date of transfer. See our audited Consolidated Financial Statements for the year ended December 31, 2025, as disclosed in our final prospectus filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, in connection with our IPO (the "Prospectus").

On June 3, 2026, INNIO Holding GmbH was converted, without interruption of its existence as legal entity, from a German limited liability company (Gesellschaft mit beschränkter Haftung) into INNIO Group Holding B.V., a Dutch private company with limited liability (besloten vennootschap met beperkte aansprakelijkheid). Following such conversion, the nominal value of the then 25,000 outstanding common shares in INNIO Group Holding B.V. was reduced to €0.04, and 749,975,000 new common shares were issued to our Principal Shareholder. Thereafter, without interruption of its existence as legal entity, INNIO Group Holding B.V. was converted into a public company under Dutch law (naamloze vennootschap), and our legal name changed to INNIO N.V. Refer to Note 23 – Earnings (loss) per share for more information.

1.3. Basis of presentation. The unaudited Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"), pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) applicable to interim financial statement and present the historical results of operations, comprehensive income (loss) and changes in equity for the three and nine months ended September 30, 2026 and 2025, the financial position as of September 30, 2026 and December 31, 2025 and cash flows for the nine months ended September 30, 2026 and 2025. Certain information related to our significant accounting policies and note disclosures have been condensed or omitted. In the opinion of management, the unaudited Consolidated Financial Statements for the interim periods presented include all adjustments necessary to present a fair statement of the results for such interim periods. These unaudited Consolidated Financial Statements should be read in conjunction with our annual audited Consolidated Financial Statements, related notes and significant accounting policies for the fiscal year ended December 31, 2025, as disclosed in our final prospectus filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, in connection with our IPO (the "Prospectus"). The unaudited Consolidated Financial Statements are presented in millions of U.S. dollars ("USD"), unless otherwise stated. Certain amounts may not sum due to rounding and percentages are calculated based on underlying amounts expressed in millions. Amounts that are non-zero but round to zero at the presented level of precision are shown as "$0.0", whereas amounts with a value of zero are presented as "$—".

1.4. Use of Estimates. The preparation of the unaudited Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates based on assumptions about current, and for certain estimates, future, economic and market conditions that affect reported amounts and related disclosures. These assumptions are deemed to be reasonable under the circumstances and although current estimates contemplate current and expected future conditions, as applicable, it is reasonably possible that actual conditions could differ from expectations, which could materially affect the results of operations, financial position and cash flows.

Estimates are used for, but are not limited to, determining the point in time when control transfers to the customer for revenues, contract margins and costs to complete the project when applying the percentage-of-completion method for revenues, recognition and measurement of warranty obligations, impairment assessments of goodwill and indefinite‑lived intangible assets, contingent consideration liabilities, fair‑value measurements, and the recognition and measurement of deferred tax asset valuation allowances.

1.5 Equity method investments. Equity method investments represent investments in entities over which the Company has the ability to exercise significant influence, but not control. The initial investments in these entities are recorded at cost and subsequently adjusted for the Company's proportionate share of the investees' net income or losses. Where the Company executes transactions with its equity method investments, its proportionate share in any profits or losses of an equity method investment is eliminated until realization of the related profit and losses by the investee. Dividends received from equity method investees reduce the carrying amount of investment when received and do not impact the Company's earnings. Equity method investments are assessed for other-than-temporary impairment when indicators suggest that its carrying amount may not be recoverable. Investments are presented within Other non-current assets in the consolidated statements of financial position and the Company's share of the results from these investments is reported in consolidated statements of operations within Other (income) expense - net.

As of September 30, 2026, the Company's equity method investments balance consists of a 24.9% interest in Nordic (Luxembourg) S.à r.l. ("Nordic LuxCo"). The equity method investment is recognized in Other non-current assets in the consolidated statements of financial position. The loss from equity method investments for the three and nine months ended September 30, 2026 was $1.1 million and $1.9 million, respectively. Refer to Note 26 – Related party transactions and Note 27 – Variable interest entities for further information.

Financial instruments - Credit losses (ASU 2025-05, Topic 326). In July 2025, the Financial Accounting Standards Board ("FASB") issued ASU 2025-05, which amends ASC 326-20 to provide a practical expedient that current conditions as of the balance sheet date do not change for the remaining life of the asset when estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. Beginning fiscal 2026, the Company adopted ASU 2025-05 and applied the practical expedient, which did not have a material impact on the Consolidated Financial Statements or disclosures.

Disaggregation of income statement expenses (ASU 2024-03, Subtopic 220-40). In November 2024, the FASB issued ASU 2024-03, which requires tabular disaggregation of specified natural expense categories (for example, employee compensation, depreciation, amortization of intangibles, and inventory-related costs) that are included in income statement captions such as cost of sales and SG&A. The amendments are effective for annual periods beginning after December 15, 2026 (calendar year 2027), with interim periods beginning after December 15, 2027. The Company is evaluating the impact; no recognition or measurement changes are expected, but note disclosure may expand upon adoption.

Derivatives and hedging (ASU 2025‑09, Topic 815). In November 2025, the FASB issued ASU 2025‑09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements, which makes targeted amendments to hedge accounting guidance intended to better align accounting with entities’ risk management activities and to clarify certain aspects of cash flow, fair value, and net investment hedges. The amendments are effective for fiscal years beginning after December 15, 2026 for public business entities and after December 15, 2027 for all other entities, with early adoption permitted. The Company will apply clarifications in the amendments on its hedge accounting policies and strategy; no recognition or measurement changes are expected on adoption.

Government grants (ASU 2025-10, Topic 832). In December 2025, the FASB issued ASU 2025-10, which adds guidance to ASC 832 on the recognition, measurement, and presentation of government grants. The amendments are effective for fiscal years beginning after December 15, 2028, with early adoption permitted. The Company is evaluating the impact of these amendments.

Environmental Credits and Environmental Credit Obligations (ASU 2026-02, Topic 818). In May 2026, the FASB issued ASU 2026-02, which adds guidance to ASC 818 on the recognition, measurement, presentation and disclosure requirements for all entities that generate, purchase, or receive environmental credits or have a regulatory compliance obligation that may be settled with environmental credits. The amendments are effective for fiscal years beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the impact of these amendments.