Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany accounts and transactions have been eliminated. In January 2025, we formed Amprius Energy Co., Ltd., a wholly owned subsidiary, established to support the expansion of our commercial sales operation in China, which is included in our condensed consolidated financial statements. The subsidiary was organized to streamline customer engagement, enhance regional sales capabilities, and improve operational efficiency within our go‑to‑market structure. The subsidiary’s activities primarily relate to sales, distribution, and customer support functions. The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the condensed consolidated financial statements.
Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany accounts and transactions have been eliminated. In January 2025, we formed Amprius Energy Co., Ltd., a wholly owned subsidiary, established to support the expansion of our commercial sales operation in China, which is included in our condensed consolidated financial statements. The subsidiary was organized to streamline customer engagement, enhance regional sales capabilities, and improve operational efficiency within our go‑to‑market structure. The subsidiary’s activities primarily relate to sales, distribution, and customer support functions. The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the condensed consolidated financial statements.
Unaudited Interim Condensed Consolidated Financial Statements	Unaudited Interim Condensed Consolidated Financial Statements The condensed consolidated balance sheet as of December 31, 2025, which has been derived from our audited consolidated financial statements as filed in our Annual Report on Form 10-K with the Securities and Exchange Commission (the “SEC”) on March 6, 2026, and the unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Any reference in these notes to applicable accounting guidance is meant to refer to the authoritative U.S. GAAP included in the Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) issued by the Financial Accounting Standards Board (“FASB”). The unaudited condensed consolidated financial statements have been prepared on a basis consistent with the annual financial statements. In management’s opinion, all adjustments made were normal or recurring in nature and necessary for the fair statement of our financial position, results of operations, comprehensive loss, changes in stockholders’ equity, and cash flows as of and for the periods presented. The financial data and other financial information disclosed in the notes to these condensed consolidated financial statements are also unaudited. The results of operations for the interim periods presented, are not necessarily indicative of the results to be expected for the full fiscal year or any other period. Certain information and note disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading.
Emerging Growth Company	Emerging Growth Company We are an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and we may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies. Furthermore, the JOBS Act exempts an emerging growth company from being required to comply with new or revised accounting standards until private companies are required to comply with such standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. We have elected to not opt out of such extended transition period. This means that when a standard is issued or revised and it has different application dates for public or private companies, we, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt such new or revised standard unless we are no longer deemed an emerging growth company. As a result, the accompanying condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of the public company effective dates.
Use of Estimates	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 disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances; the results of which form the basis for making judgments that are not readily apparent from other sources. Actual results could materially differ from management estimates using different assumptions or under different conditions. Our significant accounting estimates include useful lives of property, plant and equipment; valuation of long-lived assets; valuation of deferred taxes; lower of cost or net realizable value adjustment of inventory; incremental borrowing rate used in calculating lease obligations and right-of-use assets; and certain inputs used to measure the fair value of stock option grants using the Black-Scholes option-pricing model.
Restricted Cash Equivalents	Restricted Cash Equivalents Restricted cash equivalents, which are included within prepaid expenses and other current assets and other assets in the accompanying condensed consolidated balance sheets, consist of cash deposits required to satisfy an insurance bond requirement for our importation of goods and a letter of credit requirement under a lease agreement.
Concentration of Credit Risk	Concentration of Risk Credit Risk Financial instruments that potentially subject us to concentration of credit risk consist of cash, cash equivalents, restricted cash equivalents and accounts receivable. We maintain our cash, cash equivalents and restricted cash equivalents with major financial institutions that may at times exceed federally insured limits. We have not experienced losses on our financial assets held in these financial institutions. Management believes that these financial institutions are financially sound with minimal credit risk.
Accounts Receivable	Accounts Receivable Accounts receivable are recorded at the invoiced amount, less any estimated allowance for credit losses. An allowance for credit losses is recognized based on our evaluation of relevant information, such as the age of the receivable, collection experience and certain credit risk factors affecting our customers. A receivable deemed to be uncollectible is written off against a previously established allowance and recoveries are recognized when the cash is received. We do not accrue interest on past due balances and require no collateral. We have not experienced any significant losses from accounts receivable.
Segment Reporting and Geographic Data	Segment Reporting and Geographic Data We have a single operating and reportable segment; that is, the battery business. Our battery business derives revenue from the sale of finished battery products and customization services of our batteries. Our Chief Executive Officer is our Chief Operating Decision Maker (“CODM”). Our CODM assesses performance of our battery business and decides how to allocate resources based on the battery business’ profit, if any, or loss. Our measure of segment profit or loss is the consolidated net income or net loss, which is also reported as such in the accompanying condensed consolidated statements of operations. Our CODM measures segment profit or loss by comparing the actual consolidated net income or net loss to expectations. Since we only have a single operating and reportable segment, our CODM is provided segment expense information that is based on the expense categories shown in the accompanying condensed consolidated statements of operations. Depreciation and amortization expenses, which are disclosed in Note 5 below, are included within cost of revenue, research and development expenses, and selling, general and administrative expenses in the accompanying condensed consolidated statements of operations. Other segment items within the segment profit or loss include primarily interest income and government grant income, which are shown within other income, net in the accompanying condensed consolidated statements of operations. Our CODM does not measure segment assets for the purposes of allocating resources to, and assessing the performance of, our battery business.
Foreign Currency	Foreign Currency We determine the functional and reporting currency of our foreign subsidiary based on the primary currency in which it operates. In cases where the functional currency is not the U.S. dollar, the financial statements of our foreign subsidiary are translated into U.S. dollars using the exchange rate in effect as of the balance sheet date for assets and liabilities, and the weighted-average exchange rate during the period for revenue, cost and expenses. The translation gain (loss) is recorded as accumulated other comprehensive income (loss) within the stockholders’ equity. Foreign currency gains or losses, which were de minimis during the three and six months ended June 30, 2026 and 2025, resulting from the effect of exchange rate changes on transactions and remeasurement of monetary assets and liabilities denominated in foreign currencies are recorded as other income, net within the accompanying condensed consolidated statements of operations.
Government Grants	Government Grants In the absence of explicit US GAAP, we recognize and measure government grants by following, as an analogy, the recognition and measurement guidance of International Accounting Standard 20, Accounting for Government Grants and Disclosure of Government Assistance (“IAS 20”). Under IAS 20, government grants are recognized when there is reasonable assurance that we will comply with the conditions of each milestone and that the grant funds will be received. Government grants related to income are recognized as grant revenue or a component of other income, net on a systematic basis over the periods in which we recognize as expenses, the related costs for which the grants are intended to compensate. Based on our assessment of the U.S. Government Defense Innovation Unit (“DIU”) contract initially awarded to us in July 2025, which was subsequently amended to increase the contract amount to $18.1 million, we determined which milestones related to assets. The remaining milestones were assessed as related to income and, for the three and six months ended June 30, 2026, we recorded $0.7 million and $1.5 million within other income, net on our condensed consolidated statements of operations and as of June 30, 2026, we recorded $0.5 million in accounts receivable on our condensed consolidated balance sheet. Government grants related to assets are presented by deducting the grant from the carrying value of the asset. However, when grant milestones are achieved prior to the acquisition of the related asset, the amounts received are recorded as deferred income until the corresponding assets are acquired. As of June 30, 2026, $2.7 million of deferred grant related to government grants was recognized on our condensed consolidated balance sheet.
Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements In July 2025, the FASB issued ASU 2025-05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. This ASU introduces a practical expedient for estimating expected credit losses on current accounts receivable and current contract assets arising from transactions accounted for under ASC 606, Revenue from Contracts with Customers. Under the expedient, entities may assume that the current conditions applied in determining credit loss allowances remain unchanged for the remaining life of those assets. This ASU is required to be adopted on a prospective basis. ASU 2025-05 is effective for annual reporting periods beginning after December 15, 2025, including interim periods within those years, with early adoption permitted. We adopted this standard on January 1, 2026, with no material impact on our condensed consolidated financial statements and related disclosures. Recent Accounting Pronouncements Not Yet Adopted In December 2025, the FASB issued Accounting Standards Update 2025-10, which establishes authoritative guidance for the recognition, measurement, and presentation of government grants received by business entities. Prior to this, US GAAP did not explicitly address accounting for such grants. The guidance applies to transfers of monetary or tangible nonmonetary assets (e.g., cash, land, or buildings) from a government. It explicitly excludes income taxes (ASC 740), below-market interest rate loans, and government guarantees. For public business entities, the standard is effective for fiscal years beginning after December 15, 2028. Early adoption is permitted. Companies may adopt the guidance using a modified prospective, modified retrospective, or full retrospective transition method. We are currently evaluating the impact of this new guidance on our consolidated financial statements and related disclosures. In December 2025, the FASB issued Accounting Standards Update No. 2025-11, Interim Reporting (Topic 270) Narrow-Scope Improvements (“ASU 2025-11”), to improve the navigability and clarity of interim reporting guidance in the FASB Accounting Standards Codification and clarify when Topic 270 applies. The amendments add a comprehensive list of interim disclosure requirements currently required by GAAP and a new disclosure principle requiring an entity to disclose events since the end of the most recent fiscal year that have a material impact on the entity’s interim financial statements. ASU 2025-11 is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027 for public business entities and after December 15, 2028 for entities other than public business entities. Early adoption is permitted. We are currently evaluating the potential impact of adopting ASU 2025-11 on our interim reporting practices and related disclosures. In November 2024, the FASB issued ASU 2024-03, Income Statement–Reporting Comprehensive Income–Expense Disaggregation Disclosures (Subtopic 220-40). This ASU requires entities to disclose, in the notes to the financial statements, (i) amounts of (a) purchases of inventory, (b) employee compensation and (c) depreciation; (ii) include certain amounts that are already required to be disclosed under current U.S. GAAP in the same disclosure as the other disaggregation requirements; (iii) a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively; and (iv) the total amount of selling expenses and, in annual reporting periods, a definition of selling expenses. In March 2025, the FASB issued ASU 2025-02 to amend the effective date of ASU No. 2024-03 to clarify that all public entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating this ASU. We believe that the impact of the additional required disclosures will enhance our current financial statement disclosures.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2026

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany accounts and transactions have been eliminated.

In January 2025, we formed Amprius Energy Co., Ltd., a wholly owned subsidiary, established to support the expansion of our commercial sales operation in China, which is included in our condensed consolidated financial statements. The subsidiary was organized to streamline customer engagement, enhance regional sales capabilities, and improve operational efficiency within our go‑to‑market structure. The subsidiary’s activities primarily relate to sales, distribution, and customer support functions.

The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the condensed consolidated financial statements.

Principles of Consolidation

Basis of Presentation and Principles of Consolidation

The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the condensed consolidated financial statements.

Unaudited Interim Condensed Consolidated Financial Statements

The condensed consolidated balance sheet as of December 31, 2025, which has been derived from our audited consolidated financial statements as filed in our Annual Report on Form 10-K with the Securities and Exchange Commission (the “SEC”) on March 6, 2026, and the unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Any reference in these notes to applicable accounting guidance is meant to refer to the authoritative U.S. GAAP included in the Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) issued by the Financial Accounting Standards Board (“FASB”). The unaudited condensed consolidated financial statements have been prepared on a basis consistent with the annual financial statements. In management’s opinion, all adjustments made were normal or recurring in nature and necessary for the fair statement of our financial position, results of operations, comprehensive loss, changes in stockholders’ equity, and cash flows as of and for the periods presented. The financial data and other financial information disclosed in the notes to these condensed consolidated financial statements are also unaudited. The results of operations for the interim periods presented, are not necessarily indicative of the results to be expected for the full fiscal year or any other period.

Certain information and note disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading.

Emerging Growth Company

We are an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and we may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies. Furthermore, the JOBS Act exempts an emerging growth company from being required to comply with new or revised accounting standards until private companies are required to comply with such standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. We have elected to not opt out of such extended transition period. This means that when a standard is issued or revised and it has different application dates for public or private companies, we, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt such new or revised standard unless we are no longer deemed an emerging growth company. As a result, the accompanying condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of the public company effective dates.

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 disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances; the results of which form the basis for making judgments that are not readily apparent from other sources.

Actual results could materially differ from management estimates using different assumptions or under different conditions.

Our significant accounting estimates include useful lives of property, plant and equipment; valuation of long-lived assets; valuation of deferred taxes; lower of cost or net realizable value adjustment of inventory; incremental borrowing rate used in calculating lease obligations and right-of-use assets; and certain inputs used to measure the fair value of stock option grants using the Black-Scholes option-pricing model.

Restricted Cash Equivalents

Restricted cash equivalents, which are included within prepaid expenses and other current assets and other assets in the accompanying condensed consolidated balance sheets, consist of cash deposits required to satisfy an insurance bond requirement for our importation of goods and a letter of credit requirement under a lease agreement.

Concentration of Credit Risk

Concentration of Risk

Credit Risk

Financial instruments that potentially subject us to concentration of credit risk consist of cash, cash equivalents, restricted cash equivalents and accounts receivable.

We maintain our cash, cash equivalents and restricted cash equivalents with major financial institutions that may at times exceed federally insured limits. We have not experienced losses on our financial assets held in these financial institutions. Management believes that these financial institutions are financially sound with minimal credit risk.

Accounts Receivable

Accounts receivable are recorded at the invoiced amount, less any estimated allowance for credit losses. An allowance for credit losses is recognized based on our evaluation of relevant information, such as the age of the receivable, collection experience and certain credit risk factors affecting our customers. A receivable deemed to be uncollectible is written off against a previously established allowance and recoveries are recognized when the cash is received. We do not accrue interest on past due balances and require no collateral. We have not experienced any significant losses from

accounts receivable.

Segment Reporting and Geographic Data

We have a single operating and reportable segment; that is, the battery business. Our battery business derives revenue from the sale of finished battery products and customization services of our batteries. Our Chief Executive Officer is our Chief Operating Decision Maker (“CODM”).

Our CODM assesses performance of our battery business and decides how to allocate resources based on the battery business’ profit, if any, or loss. Our measure of segment profit or loss is the consolidated net income or net loss, which is also reported as such in the accompanying condensed consolidated statements of operations. Our CODM measures segment profit or loss by comparing the actual consolidated net income or net loss to expectations. Since we only have a single operating and reportable segment, our CODM is provided segment expense information that is based on the expense categories shown in the accompanying condensed consolidated statements of operations. Depreciation and amortization expenses, which are disclosed in Note 5 below, are included within cost of revenue, research and development expenses, and selling, general and administrative expenses in the accompanying condensed consolidated statements of operations. Other segment items within the segment profit or loss include primarily interest income and government grant income, which are shown within other income, net in the accompanying condensed consolidated statements of operations.

Our CODM does not measure segment assets for the purposes of allocating resources to, and assessing the performance of, our battery business.

Foreign Currency

We determine the functional and reporting currency of our foreign subsidiary based on the primary currency in which it operates. In cases where the functional currency is not the U.S. dollar, the financial statements of our foreign subsidiary are translated into U.S. dollars using the exchange rate in effect as of the balance sheet date for assets and liabilities, and the weighted-average exchange rate during the period for revenue, cost and expenses. The translation gain (loss) is recorded as accumulated other comprehensive income (loss) within the stockholders’ equity.

Foreign currency gains or losses, which were de minimis during the three and six months ended June 30, 2026 and 2025, resulting from the effect of exchange rate changes on transactions and remeasurement of monetary assets and liabilities denominated in foreign currencies are recorded as other income, net within the accompanying condensed consolidated statements of operations.

Government Grants

In the absence of explicit US GAAP, we recognize and measure government grants by following, as an analogy, the recognition and measurement guidance of International Accounting Standard 20, Accounting for Government Grants and Disclosure of Government Assistance (“IAS 20”). Under IAS 20, government grants are recognized when there is reasonable assurance that we will comply with the conditions of each milestone and that the grant funds will be received.

Government grants related to income are recognized as grant revenue or a component of other income, net on a systematic basis over the periods in which we recognize as expenses, the related costs for which the grants are intended to compensate. Based on our assessment of the U.S. Government Defense Innovation Unit (“DIU”) contract initially awarded to us in July 2025, which was subsequently amended to increase the contract amount to $18.1 million, we determined which milestones related to assets. The remaining milestones were assessed as related to income and, for the three and six months ended June 30, 2026, we recorded $0.7 million and $1.5 million within other income, net on our condensed consolidated statements of operations and as of June 30, 2026, we recorded $0.5 million in accounts receivable on our condensed consolidated balance sheet.

Government grants related to assets are presented by deducting the grant from the carrying value of the asset. However, when grant milestones are achieved prior to the acquisition of the related asset, the amounts received are recorded as deferred income until the corresponding assets are acquired. As of June 30, 2026, $2.7 million of deferred grant related to government grants was recognized on our condensed consolidated balance sheet.

Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted

Recently Adopted Accounting Pronouncements

In July 2025, the FASB issued ASU 2025-05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. This ASU introduces a practical expedient for estimating expected credit losses on current accounts receivable and current contract assets arising from transactions accounted for under ASC 606, Revenue from Contracts with Customers. Under the expedient, entities may assume that the current conditions applied in determining credit loss allowances remain unchanged for the remaining life of those assets. This ASU is required to be adopted on a prospective basis. ASU 2025-05 is effective for annual reporting periods beginning after December 15, 2025, including interim periods within those years, with early adoption permitted. We adopted this standard on January 1, 2026, with no material impact on our condensed consolidated financial statements and related disclosures.

Recent Accounting Pronouncements Not Yet Adopted

In December 2025, the FASB issued Accounting Standards Update 2025-10, which establishes authoritative guidance for the recognition, measurement, and presentation of government grants received by business entities. Prior to this, US GAAP did not explicitly address accounting for such grants. The guidance applies to transfers of monetary or tangible nonmonetary assets (e.g., cash, land, or buildings) from a government. It explicitly excludes income taxes (ASC 740), below-market interest rate loans, and government guarantees. For public business entities, the standard is effective for fiscal years beginning after December 15, 2028. Early adoption is permitted. Companies may adopt the guidance using a modified prospective, modified retrospective, or full retrospective transition method. We are currently evaluating the impact of this new guidance on our consolidated financial statements and related disclosures.

In December 2025, the FASB issued Accounting Standards Update No. 2025-11, Interim Reporting (Topic 270) Narrow-Scope Improvements (“ASU 2025-11”), to improve the navigability and clarity of interim reporting guidance in the FASB Accounting Standards Codification and clarify when Topic 270 applies. The amendments add a comprehensive list of interim disclosure requirements currently required by GAAP and a new disclosure principle requiring an entity to disclose events since the end of the most recent fiscal year that have a material impact on the entity’s interim financial statements. ASU 2025-11 is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027 for public business entities and after December 15, 2028 for entities other than public business entities. Early adoption is permitted. We are currently evaluating the potential impact of adopting ASU 2025-11 on our interim reporting practices and related disclosures.

In November 2024, the FASB issued ASU 2024-03, Income Statement–Reporting Comprehensive Income–Expense Disaggregation Disclosures (Subtopic 220-40). This ASU requires entities to disclose, in the notes to the financial statements, (i) amounts of (a) purchases of inventory, (b) employee compensation and (c) depreciation; (ii) include certain amounts that are already required to be disclosed under current U.S. GAAP in the same disclosure as the other disaggregation requirements; (iii) a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively; and (iv) the total amount of selling expenses and, in annual reporting periods, a definition of selling expenses. In March 2025, the FASB issued ASU 2025-02 to amend the effective date of ASU No. 2024-03 to clarify that all public entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating this ASU. We believe that the impact of the additional required disclosures will enhance our current financial statement disclosures.