Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation and Principles of Consolidation The accompanying 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. The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the consolidated financial statements. In connection with the closing of the Business Combination in fiscal year 2022, whereby Legacy Amprius was determined as the accounting acquirer for accounting and reporting purposes, the historical financial statements of Legacy Amprius became the historical financial statements of the combined company and no goodwill or other intangible assets were recorded. As a result, the accompanying consolidated financial statements reflect (i) the assets and liabilities of Legacy Amprius at their historical cost; (ii) the historical operating results of Legacy Amprius prior to the Business Combination; and (iii) Legacy Amprius’ equity structure, which has been retroactively restated in the period prior to the Business Combination to reflect the number of shares of the Company’s common stock issued to Legacy Amprius stockholders. As such, the shares, corresponding capital amounts, and net loss per share related to Legacy Amprius common stock have been retroactively restated to reflect the effect of the exchange ratio of 1.45590 (the “Exchange Ratio”) established in the Business Combination. Prior to the Business Combination, our financial statements were presented on a carve-out basis using our historical results of operations and historical basis of assets and liabilities derived from the accounting records of Amprius Holdings, adjusted as necessary to conform with U.S. GAAP. The underlying assumptions in our presentation of our financial statements prior to the Business Combination include: •Balance sheet includes all of our owned assets, assets assigned or contributed by Amprius Holdings, and liabilities incurred by Amprius Holdings on our behalf. •Statement of operations reflects all activities directly attributable to us, which include an allocation of certain general and administrative expenses of Amprius Holdings. •Certain general and administrative expenses of Amprius Holdings, such as the payroll-related expenses for two executive employees, legal, tax, insurance and accounting fees, were shared between us, Amprius Holdings and its other subsidiaries. Since those two executive employees provided us and Amprius Holdings’ other subsidiaries with governance and management oversight, those shared expenses were allocated between us and Amprius Holdings’ other subsidiaries. The level of effort spent by Amprius Holdings’ executives was not correlated with the level of our business activity, revenue or other financial operating metrics and of Amprius Holdings’ other subsidiaries. As a result, those shared expenses were allocated equally between us and Amprius Holdings’ other subsidiaries. •Prior to the distribution of Amprius Holdings’ other subsidiaries in February 2022, the shared expenses of Amprius Holdings were allocated equally between us and Amprius Holdings’ other subsidiaries. After February 2022, and up to the Closing Date of the Business Combination, those expenses were fully allocated to us. Management believes that the assumptions described above, including the allocation of certain shared expenses, are reasonable and consistently applied for the periods presented prior to the Business Combination. However, the financial statements that were presented prior to the Business Combination may not be indicative of our future performance and do not necessarily reflect what the financial position, results of operations and cash flows would have been had we operated as a separate and standalone entity.
Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying 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. The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the consolidated financial statements. In connection with the closing of the Business Combination in fiscal year 2022, whereby Legacy Amprius was determined as the accounting acquirer for accounting and reporting purposes, the historical financial statements of Legacy Amprius became the historical financial statements of the combined company and no goodwill or other intangible assets were recorded. As a result, the accompanying consolidated financial statements reflect (i) the assets and liabilities of Legacy Amprius at their historical cost; (ii) the historical operating results of Legacy Amprius prior to the Business Combination; and (iii) Legacy Amprius’ equity structure, which has been retroactively restated in the period prior to the Business Combination to reflect the number of shares of the Company’s common stock issued to Legacy Amprius stockholders. As such, the shares, corresponding capital amounts, and net loss per share related to Legacy Amprius common stock have been retroactively restated to reflect the effect of the exchange ratio of 1.45590 (the “Exchange Ratio”) established in the Business Combination. Prior to the Business Combination, our financial statements were presented on a carve-out basis using our historical results of operations and historical basis of assets and liabilities derived from the accounting records of Amprius Holdings, adjusted as necessary to conform with U.S. GAAP. The underlying assumptions in our presentation of our financial statements prior to the Business Combination include: •Balance sheet includes all of our owned assets, assets assigned or contributed by Amprius Holdings, and liabilities incurred by Amprius Holdings on our behalf. •Statement of operations reflects all activities directly attributable to us, which include an allocation of certain general and administrative expenses of Amprius Holdings. •Certain general and administrative expenses of Amprius Holdings, such as the payroll-related expenses for two executive employees, legal, tax, insurance and accounting fees, were shared between us, Amprius Holdings and its other subsidiaries. Since those two executive employees provided us and Amprius Holdings’ other subsidiaries with governance and management oversight, those shared expenses were allocated between us and Amprius Holdings’ other subsidiaries. The level of effort spent by Amprius Holdings’ executives was not correlated with the level of our business activity, revenue or other financial operating metrics and of Amprius Holdings’ other subsidiaries. As a result, those shared expenses were allocated equally between us and Amprius Holdings’ other subsidiaries. •Prior to the distribution of Amprius Holdings’ other subsidiaries in February 2022, the shared expenses of Amprius Holdings were allocated equally between us and Amprius Holdings’ other subsidiaries. After February 2022, and up to the Closing Date of the Business Combination, those expenses were fully allocated to us. Management believes that the assumptions described above, including the allocation of certain shared expenses, are reasonable and consistently applied for the periods presented prior to the Business Combination. However, the financial statements that were presented prior to the Business Combination may not be indicative of our future performance and do not necessarily reflect what the financial position, results of operations and cash flows would have been had we operated as a separate and standalone entity.
Emerging Growth Company	Emerging Growth Company We are an emerging growth company as defined in Section 2(a) of the Securities Act of 1933 (as amended) (“Securities 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. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies 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 consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of 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 judgements 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 deferred taxes; lower of cost or net realizable adjustment of inventory; carve-out of financial statements including the allocation of assets, liabilities and expenses prior to the Business Combination; incremental borrowing rate used in calculating lease obligations and right-of-use assets; and fair value of common stock and other inputs used to value stock-based compensation awards prior to the Business Combination.
Fair Value Measurement	Fair Value Measurement Assets and liabilities recorded at fair value in the financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, which are directly related to the amount of subjectivity, associated with the inputs to the valuation of these assets or liabilities are as follows: Level 1 – Inputs that are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2 – Inputs (other than quoted prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities, and which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considering counterparty credit risk in our assessment of fair value.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Cash consists of bank deposits and cash equivalents consist of a money market fund with original maturity of less than 90 days from the date of purchase. Restricted cash pertains to a cash collateral required by our lessor to satisfy a letter of credit requirement under a lease agreement.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject us to concentration of credit risk consist of cash, cash equivalents, restricted cash and accounts receivable. We maintain our cash, cash equivalents and restricted cash 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 consist mainly of amounts due from U.S. government agencies or sponsored entities and large public entities which limits our credit risk. Through December 31, 2023, we have not experienced any credit losses.
Segment Reporting	Segment Reporting We have determined that the Chief Executive Officer is our Chief Operating Decision Maker (“CODM”). The CODM reviews financial information presented on an aggregate basis for the purposes of assessing our performance and making decisions on how to allocate resources. Accordingly, we have determined that we operate in a single operating and reportable segment. All of our revenues are geographically earned in the United States and our property, plant and equipment are located in the United States.
Revenue Recognition	Revenue Recognition We generate revenue from the (i) sale of finished battery products and (i) arrangements for customization design services. The customization design services generally include designing and developing custom batteries by applying our existing technology into a customer’s required specifications and delivery of prototype batteries. We recognize revenue when a customer obtains control of promised goods or services in an amount that reflects the consideration that we expect to receive in exchange for those goods or services. To achieve the core principle of revenue recognition, we apply the following steps pursuant to Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers: 1.Identify the contract with the customer. We generally enter into fixed-price agreements which outline the terms of our arrangements with the customers. We may also receive purchase orders or enter into statements of work to establish the terms of our arrangements with our customers. 2.Identify the performance obligations in the contract. Our contract to sell finished battery products do not require customization. Our contract for customization design services vary depending on the customers’ requirements, which may include (i) designing custom batteries, (ii) providing progress reporting, (iii) developing preliminary batteries, (iv) testing battery performance and (v) delivering final battery prototypes. Those promises are generally inputs to a combined output and are accounted for as a single performance obligation. 3.Determine the transaction price. Transaction price is based upon the amount of consideration that our customers agree to pay for the goods or services we deliver. Payment terms for our customization design service contracts are generally based on the achievement of defined milestones. Since revenue is generally recognized at the point in time when control transfers to the customer, the variable consideration, if any, is not considered to be constrained at the inception of the contract and the transaction price equals the cumulative payments to which we are entitled to. 4.Allocate the transaction price to the performance obligations in the contract. Generally, our contracts with customers contain a single performance obligation; therefore, allocation is not necessary. 5.Recognize revenue when, or as, a performance obligation is satisfied. We recognize revenue at the point in time when control is transferred to the customers, which is generally (i) upon shipment, in the case of sale of finished battery products, and (ii) upon completion and/or delivery of prototype batteries, in the case of customization design services. In case a customer requests us to keep the finished products, such as in a “bill-and-hold” arrangement, we recognize revenue from such arrangement when the control is transferred to such customer. Control under a bill-and-hold arrangement occurs when the title and risk of loss on the finished products have passed to the customer and we do not have the ability to use or sell them to other customers. Finished products under a bill-and-hold arrangement are stored in our premises, but segregated from our own inventories.
Grant Revenue	Grant Revenue Payment from the U.S. federal government under a nonrefundable expense reimbursement arrangement is treated as government grant. An expense reimbursement grant entitle us to claim reimbursement of certain qualified expenses incurred in support of our product development programs. The nature and amount of such expenses are determined by each respective grant. We determined that government grants are outside the scope of Topic 606, Revenue from Contracts with Customers, because such grants do not involve a reciprocal transfer in which each party receives and sacrifices approximately commensurate value. Therefore, the grants meet the definition of a contribution and are non-exchange transactions. In absence of explicit US GAAP guidance on contributions received from government agencies, we apply by analogy the recognition and measurement guidance under International Accounting Standard 20, Accounting for Government Grants and Disclosure of Government Assistance. Following this approach, we recognize grants at fair value only when there is reasonable assurance that we will comply with the conditions of the grants, and that the grants will be received. We recognize as revenue the amounts received or receivable from expense reimbursement grants to the extent, and in the period in which, the qualifying costs have been incurred.
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.
Inventories	Inventories Inventories, which consist of raw materials, work-in-process and finished goods, are stated at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method. Net realizable value is determined based upon the estimated selling price of the inventory in the ordinary course of business, less reasonably predictable costs of completion or disposal and transportation. The cost of raw materials, work-in-process and finished goods generally exceeds their respective realizable value. When an inventory is adjusted to its net realizable value, a new cost basis is established and such cost is not adjusted for any potential recovery or increase in cost. Obsolete inventories are written off to cost of goods sold.
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Assets that are being built or constructed are recorded as construction in progress. Depreciation for those assets begins when the assets are ready for their intended use. Expenditures for repairs and maintenance are expensed as incurred. Upon disposition, the cost and related accumulated depreciation and amortization are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets We review the valuation of long-lived assets, which consisted mainly of property, plant and equipment, whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. The recoverability of long-lived assets or asset groups is calculated based on the estimated undiscounted future cash flows expected to result from the use and eventual disposition of the asset. An impairment loss is recognized based on the amount by which the carrying value exceeds the fair value of the asset. Fair value is determined using the estimated cash flows discounted at a rate commensurate with the risk involved.
Leases	Leases We determine if an arrangement is a lease, or contains a lease, by evaluating whether there is an identified asset and whether we control the use of the identified asset throughout the period of use. We determine the classification of the lease, whether operating or finance lease, at the lease commencement date, which is the date we obtain control of the leased asset. We recognize the right-of-use (“ROU”) assets and lease liabilities on the lease commencement date based upon the present value of the fixed lease payments over the non-cancelable lease term, unless it is reasonably certain that any renewal or termination option will be exercised. Variable costs, such as common area maintenance fees, property insurance and property taxes, are not included in the measurement of the ROU assets and lease liabilities, but are expensed as incurred. As the implicit rate of the leases is not determinable, we use an incremental borrowing rate in determining the present value of the lease payments. We do not recognize ROU assets on lease arrangements with a term of 12 months or less. Lease expense for such arrangements is recognized on a straight-line basis over the term of the lease. We account for the lease components and non-lease components as a single lease component. Modifications are assessed to determine whether incremental differences result in new contract terms and should be accounted for as a new lease or whether the additional right of use should be included in the original lease and continue to be accounted for with the remaining ROU asset. Lease liabilities are increased by interest and reduced by payments each period, and the right of use asset is amortized over the lease term. For operating leases, interest on the lease liability and the amortization of the right-of-use asset result in straight-line rent expense over the lease term. For finance leases, interest on the lease liability and the amortization of the right-of-use asset results in front-loaded expense over the lease term.
Warranty Liability	Warranty Liability We provide guarantee that products sold to customers will meet the published or agreed upon specification. Products that do not meet specification are replaced at no charge to the customer. We had no significant warranty claims based on our historical experience.
Loss Contingencies	Loss Contingencies In the normal course of business, we may be involved in claims and legal proceedings. We record a liability for such matters when it is probable that a loss has been incurred and the amounts can be reasonably estimated. When only a range of possible loss can be established, the most probable amount in the range is accrued. If no amount within this range is a better estimate than any other amount within the range, the minimum amount in the range is accrued. Legal costs associated with these loss contingencies are expensed as incurred.
Deferred Costs	Deferred Costs Certain costs, which consist primarily of payroll-related costs, are initially deferred when (i) the costs relate directly to a customer contract, (ii) the costs generate or enhance our resources that will be used in satisfying future performance obligations, and (iii) the costs are expected to be recovered. If these criteria are not met, the costs are expensed as incurred. Deferred costs are recognized as cost of revenues in the period when the related revenue is recognized, except when the costs incurred exceed the amount expected to be recovered, in which case they are expensed as incurred. The recoverable amount is estimated to equal the amount of consideration that we have received but not yet recognized as revenue, plus the amount that we expect to receive in the future.
Cost of Revenues	Cost of Revenues Cost of revenue, which includes the cost of finished goods sold and the cost of customization design services, are comprised primarily of costs of raw materials, labor costs and the allocation of overhead costs incurred in producing batteries or performing the customization development work, and the costs of silicon anode batteries purchased from Berzelius (Nanjing) Co. Ltd., which prior to February 2022 was a subsidiary of Amprius Holdings. Labor costs consist of personnel-related expenses such as salaries, employee benefits and stock-based compensation expense. Overhead and other costs consist primarily of outside services, utilities, rent, depreciation expense and other facilities-related costs. Costs related to batteries and design services are recognized in the same period as the associated revenue is recognized. In addition, we include under cost of revenue certain non-capitalizable expenses incurred during the preliminary stage of our plan to construct a GWh-scale manufacturing facility, such as re-zoning costs and engineering studies.
Research and Development Costs	Research and Development Costs Research and development (“R&D”) costs are expensed as incurred. These costs consist mainly of personnel-related costs such as salaries, employee benefits and stock-based compensation expense of our R&D personnel, outside contractors, materials, R&D equipment for which there is no alternative future use, and allocation of overhead costs, which include utilities, rent, depreciation expense and other facilities-related costs. R&D activities relate to the conceptual formulation and design of preproduction experimental prototypes and models.
Advertising Costs	Advertising Costs Advertising costs, which were not material during the years ended December 31, 2023 and 2022, are expensed as incurred.
Stock-Based Compensation	Stock-Based Compensation Since the Business Combination, after becoming a public company, the fair value of the shares of common stock underlying stock grants is determined based on the closing price of our common stock. Amprius Holdings granted certain of its employees, directors and contract workers stock-based awards under its Equity Incentive Plan (“Amprius Holdings 2008 Stock Plan”). When we were formed, certain employees and contract workers of Amprius Holdings were transferred, or provided services, to us. We recorded the stock-based compensation costs associated with the outstanding stock-based awards granted to those individuals with a corresponding increase in additional paid-in capital. In 2016, we adopted the 2016 Equity Incentive Plan (“2016 Plan”), which was separate from the Amprius Holdings Plan. We granted stock-based awards under the 2016 Plan to certain employees, directors and contract workers of Amprius Holdings who provided services to the Company. We recorded the stock-based compensation costs associated with those awards. In September 2022, we adopted the 2022 Equity Incentive Plan (“2022 Plan”) and terminated the 2016 Plan. We measure stock-based compensation for stock options at fair value on the date of grant using the Black-Scholes option-pricing model. We measure stock-based compensation for restricted stock units (“RSUs”) based on the closing price of our common stock on the date of grant. We recognize stock-based compensation expense on a straight-line basis over the period from the date of the grant to the date the award is fully vested, which is generally four years. We have elected to account for forfeitures as they occur. The Black-Scholes option-pricing model requires the use of highly subjective assumptions which determine the fair value of stock option awards. These assumptions include: •Expected Term — The expected term of stock options represents the period that our stock-based awards are expected to be outstanding. The expected term had been derived based on the simplified method for awards that qualify as plain-vanilla options because we have no sufficient historical experience for determining the expected term. •Expected Volatility — Since we have no sufficient trading history on our common stock, we estimate volatility by evaluating the average historical volatility of a peer group of companies for the period immediately preceding the option grant for a term that is approximately equal to the option’s expected term. •Risk-Free Interest Rate — We base the risk-free interest rate on the implied yield available on the U.S. Treasury zero coupon issues with a remaining term equivalent to the expected term of the option. •Expected Dividend — We have not paid dividends and have no plans to pay dividends on our common stock. Therefore, we use an expected dividend yield of zero. The Black-Scholes option-pricing model also requires input on the fair value of the underlying common stock. There is no public market for Amprius Holdings’ common stock and prior to the Business Combination, there was no public market for Legacy Amprius’ common stock. As such, the fair value of the shares of common stock underlying stock option grants prior to the Business Combination had been determined by our board of directors at the time of grant by considering a number of objective and subjective factors including important developments in our operations, valuations performed by an independent third party, the rights, preferences, and privileges of Amprius Holdings’ preferred securities as compared to those of Legacy Amprius’ and Amprius Holdings’ common stock, including liquidation preferences of Amprius Holdings’ preferred stock, the Company’s stage of development and financial position, the market conditions affecting the industry, the stock price performance and volatility of comparable public companies, and the likelihood of achieving a liquidity event, among other factors. The third-party valuations were performed in accordance with the American Institute of Certified Public Accountants’ Accounting and Valuation Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation (the “Practice Aid”). The Practice Aid identifies various available methods for allocating the enterprise value across classes of capital stock in determining the fair value of our common stock at each valuation date. The valuations for Amprius Holdings’ common stock were prepared using the Option Pricing Method (“OPM”), and the valuations for Legacy Amprius’ common stock were prepared using the probability-weighed expected return method (“PWERM”), both of which used market approaches to estimate our enterprise value. PWERM is a hybrid method where the equity value in one or more of the scenarios is calculated using an OPM. The PWERM is a scenario-based methodology that estimates the fair value of common stock based upon an analysis of future values for the company, assuming various outcomes. The common stock value is based on the probability-weighted present value of expected future investment returns considering each of the possible outcomes available as well as the rights of each class of stock. The future value of the common stock under each outcome is discounted back to the valuation date at an appropriate risk-adjusted discount rate and probability weighted to arrive at an indication of value for the common stock. A discount for lack of marketability of the common stock is then applied to arrive at an indication of value for the common stock. The OPM treats common stock and preferred stock as call options on the total equity value of a company, with exercise prices based on the value thresholds at which the allocation among the various holders of a company’s securities changes. Under this method, the common stock has value only if the funds available for distribution to stockholders exceeded the value of the preferred stock liquidation preferences at the time of the liquidity event, such as a strategic sale or a merger.
Common Stock Warrants	Common Stock Warrants We have classified our freestanding common stock warrants as equity in accordance with the applicable guidance in ASC 815-40, Derivatives and Hedging - Contracts in Entity’s Own Equity. Accordingly, a freestanding instrument, such as a stock warrant, is classified as equity when (i) the instrument is considered indexed to an entity’s own stock and (ii) when certain criteria for equity classification are met. When assessing whether our stock warrants are indexed to our own stock, we evaluated the stock warrants’ exercise contingencies and adjustment features. The stock warrants’ exercise contingencies, which are not based on observable market or index, include restriction to exercise a portion of the stock warrants if the holder exceeds specified beneficial ownership limitations and the holder being required to exercise the stock warrants in the event of a reorganization or a warrant redemption. Since the exercise contingencies are not based on observable market or index, the stock warrants were not precluded from being considered indexed to our own stock. In addition, the stock warrants’ adjustment features, such as a change in exercise price in the event of a stock split or stock dividend and a downward adjustment on the exercise price at our discretion, did not preclude the stock warrants from being considered indexed to our own stock. We also evaluated other provisions in the warrant agreement, such as the share-settlement provision and the replacement of the instrument in the event of a reorganization, and determined that those provisions do not preclude the stock warrants from being classified as equity.
Income Taxes	Income Taxes We account for income taxes in accordance with ASC 740, Income Taxes. Deferred tax balances are recognized for the estimated future tax consequences attributable to temporary differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets are also recognized for temporary differences that arise from net operating losses and credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax balances of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. We recognize accrued interest and penalties related to unrecognized tax benefits, if any, as income tax expense. Concurrent with the execution of the Business Combination Agreement, we and Amprius Holdings entered into a Tax Sharing Agreement which provides that with respect to any U.S. federal consolidated group of which Amprius Holdings and the Company are members, Amprius Holdings will be responsible for and will indemnify us for the tax liability of such group. In addition, Amprius Holdings will be responsible for and will indemnify us for state taxes of any consolidated, combined or unitary tax group for state tax purposes that includes Amprius Holdings and the Company. The Tax Sharing Agreement also provides that Amprius Holdings will generally control any tax returns and any tax audits or other proceedings for the taxes addressed by the Tax Sharing Agreement. The Tax Sharing Agreement did not have a material impact and is not expected to have a material impact on our future results of operations. Prior to the Business Combination, any income taxes in our financial statements have been allocated in a manner that is systematic, rational and consistent. Our results of operations had historically been included in Amprius Holdings’ combined U.S. income tax returns. Since the Company and Amprius Holdings were members of a consolidated group for federal and state income tax purposes prior to the Business Combination, the net operating loss carryover of the consolidated group would be available to be utilized by either us or other members for periods prior to the Business Combination. Since we did not file separate income tax returns from Amprius Holdings prior to the Business Combination, payments to certain tax authorities during the periods prior to the Business Combination may have been made directly by Amprius Holdings, and not by us. For tax jurisdictions where we were included with Amprius Holdings’ consolidated tax filings, we did not recognize a tax payable to or from Amprius Holdings, and the payments of taxes were deemed to be settled immediately with the legal entities paying for the taxes in the respective tax jurisdictions.
Net Loss Per Share	Net Loss Per Share Basic net loss per share of common stock is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, without consideration of potentially dilutive securities. Diluted net loss per share of common stock is calculated by dividing the net loss attributable to common stockholders by the sum of the weighted-average number of shares of common stock outstanding and potentially dilutive securities during the period. Potentially dilutive securities include shares issuable upon the exercise of stock options, vesting of RSUs and exercise of common stock warrants; however, these have been excluded from the diluted net loss per share calculation because their effect were anti-dilutive given our net loss. Therefore, the basic and diluted net loss per share of common stock for all periods presented were the same.
Recently Adopted/Not Yet Adopted Accounting Standards	Recent Accounting Pronouncements Adopted On January 1, 2023, we adopted the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and related amendment under ASU 2019-10, which requires that credit losses on financial assets, such as trade and other receivables, be recognized as allowance for credit losses. Credit losses on trade and other receivables will reflect the current estimate of the expected credit losses that generally will result in the earlier recognition of allowance for credit losses. The adoption of this ASU did not have a material impact on our consolidated financial statements. Not Yet Adopted In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU requires entities to disclose, among others, (i) specific categories in the rate reconciliation table (ii) additional information for reconciling items that meet a quantitative threshold and (iii) the amount of income taxes paid on a disaggregated level. This ASU is required to be adopted on a prospective basis. As an emerging growth company, this ASU is effective starting on our annual reporting for the year ending December 31, 2026. 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 disclosure. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU requires entities to disclose, among others, (i) significant segment expenses that are regularly provided to the CODM for measuring segment profit or loss, (ii) amounts for other significant items by reportable segment and (iii) an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding resource allocation. This ASU is required to be adopted on a retrospective basis starting on our annual reporting for the year ending December 31, 2024. Early adoption is permitted. We are currently evaluating this ASU. We believe that the impact of the additional required disclosures will enhance our financial statement disclosure.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Basis of Presentation and Principles of Consolidation

The accompanying 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.

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

In connection with the closing of the Business Combination in fiscal year 2022, whereby Legacy Amprius was determined as the accounting acquirer for accounting and reporting purposes, the historical financial statements of Legacy Amprius became the historical financial statements of the combined company and no goodwill or other intangible assets were recorded. As a result, the accompanying consolidated financial statements reflect (i) the assets and liabilities of Legacy Amprius at their historical cost; (ii) the historical operating results of Legacy Amprius prior to the Business Combination; and (iii) Legacy Amprius’ equity structure, which has been retroactively restated in the period prior to the Business Combination to reflect the number of shares of the Company’s common stock issued to Legacy Amprius stockholders. As such, the shares, corresponding capital amounts, and net loss per share related to Legacy Amprius common stock have been retroactively restated to reflect the effect of the exchange ratio of 1.45590 (the “Exchange Ratio”) established in the Business Combination.

Prior to the Business Combination, our financial statements were presented on a carve-out basis using our historical results of operations and historical basis of assets and liabilities derived from the accounting records of Amprius Holdings, adjusted as necessary to conform with U.S. GAAP. The underlying assumptions in our presentation of our financial statements prior to the Business Combination include:

•Balance sheet includes all of our owned assets, assets assigned or contributed by Amprius Holdings, and liabilities incurred by Amprius Holdings on our behalf.

•Statement of operations reflects all activities directly attributable to us, which include an allocation of certain general and administrative expenses of Amprius Holdings.

•Certain general and administrative expenses of Amprius Holdings, such as the payroll-related expenses for two executive employees, legal, tax, insurance and accounting fees, were shared between us, Amprius Holdings and its other subsidiaries. Since those two executive employees provided us and Amprius Holdings’ other subsidiaries with governance and management oversight, those shared expenses were allocated between us and Amprius Holdings’ other subsidiaries. The level of effort spent by Amprius Holdings’ executives was not correlated with the level of our business activity, revenue or other financial operating metrics and of Amprius Holdings’ other subsidiaries. As a result, those shared expenses were allocated equally between us and Amprius Holdings’ other subsidiaries.

•Prior to the distribution of Amprius Holdings’ other subsidiaries in February 2022, the shared expenses of Amprius Holdings were allocated equally between us and Amprius Holdings’ other subsidiaries. After February 2022, and up to the Closing Date of the Business Combination, those expenses were fully allocated to us.

Management believes that the assumptions described above, including the allocation of certain shared expenses, are reasonable and consistently applied for the periods presented prior to the Business Combination. However, the financial statements that were presented prior to the Business Combination may not be indicative of our future performance and do not necessarily reflect what the financial position, results of operations and cash flows would have been had we operated as a separate and standalone entity.

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 consolidated financial statements.

•Balance sheet includes all of our owned assets, assets assigned or contributed by Amprius Holdings, and liabilities incurred by Amprius Holdings on our behalf.

•Statement of operations reflects all activities directly attributable to us, which include an allocation of certain general and administrative expenses of Amprius Holdings.

Emerging Growth Company

We are an emerging growth company as defined in Section 2(a) of the Securities Act of 1933 (as amended) (“Securities 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. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies 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 consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of 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 judgements 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 deferred taxes; lower of cost or net realizable adjustment of inventory; carve-out of financial statements including the allocation of assets, liabilities and expenses prior to the Business Combination; incremental borrowing rate used in calculating lease obligations and right-of-use assets; and fair value of common stock and other inputs used to value stock-based compensation awards prior to the Business Combination.

Fair Value Measurement

Assets and liabilities recorded at fair value in the financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, which are directly related to the amount of subjectivity, associated with the inputs to the valuation of these assets or liabilities are as follows:

Level 1 – Inputs that are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2 – Inputs (other than quoted prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities, and which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considering counterparty credit risk in our assessment of fair value.

Cash, Cash Equivalents and Restricted Cash

Cash consists of bank deposits and cash equivalents consist of a money market fund with original maturity of less than 90 days from the date of purchase.

Restricted cash pertains to a cash collateral required by our lessor to satisfy a letter of credit requirement under a lease agreement.

Concentration of Credit Risk

Financial instruments that potentially subject us to concentration of credit risk consist of cash, cash equivalents, restricted cash and accounts receivable. We maintain our cash, cash equivalents and restricted cash 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 consist mainly of amounts due from U.S. government agencies or sponsored entities and large public entities which limits our credit risk. Through December 31, 2023, we have not experienced any credit losses.

Segment Reporting

We have determined that the Chief Executive Officer is our Chief Operating Decision Maker (“CODM”). The CODM reviews financial information presented on an aggregate basis for the purposes of assessing our performance and making decisions on how to allocate resources. Accordingly, we have determined that we operate in a single operating and reportable segment. All of our revenues are geographically earned in the United States and our property, plant and equipment are located in the United States.

Revenue Recognition

We generate revenue from the (i) sale of finished battery products and (i) arrangements for customization design services. The customization design services generally include designing and developing custom batteries by applying our existing technology into a customer’s required specifications and delivery of prototype batteries.

We recognize revenue when a customer obtains control of promised goods or services in an amount that reflects the consideration that we expect to receive in exchange for those goods or services. To achieve the core principle of revenue recognition, we apply the following steps pursuant to Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers:

1.Identify the contract with the customer. We generally enter into fixed-price agreements which outline the terms of our arrangements with the customers. We may also receive purchase orders or enter into statements of work to establish the terms of our arrangements with our customers.

2.Identify the performance obligations in the contract. Our contract to sell finished battery products do not require customization. Our contract for customization design services vary depending on the customers’ requirements, which may include (i) designing custom batteries, (ii) providing progress reporting, (iii) developing preliminary batteries, (iv) testing battery performance and (v) delivering final battery prototypes. Those promises are generally inputs to a combined output and are accounted for as a single performance obligation.

3.Determine the transaction price. Transaction price is based upon the amount of consideration that our customers agree to pay for the goods or services we deliver. Payment terms for our customization design service contracts are generally based on the achievement of defined milestones. Since revenue is generally recognized at the point in time when control transfers to the customer, the variable consideration, if any, is not considered to be constrained at the inception of the contract and the transaction price equals the cumulative payments to which we are entitled to.

4.Allocate the transaction price to the performance obligations in the contract. Generally, our contracts with customers contain a single performance obligation; therefore, allocation is not necessary.

5.Recognize revenue when, or as, a performance obligation is satisfied. We recognize revenue at the point in time when control is transferred to the customers, which is generally (i) upon shipment, in the case of sale of finished battery products, and (ii) upon completion and/or delivery of prototype batteries, in the case of customization design services.

In case a customer requests us to keep the finished products, such as in a “bill-and-hold” arrangement, we recognize revenue from such arrangement when the control is transferred to such customer. Control under a bill-and-hold arrangement occurs when the title and risk of loss on the finished products have passed to the customer and we do not have the ability to use or sell them to other customers. Finished products under a bill-and-hold arrangement are stored in our premises, but segregated from our own inventories.

Grant Revenue

Payment from the U.S. federal government under a nonrefundable expense reimbursement arrangement is treated as government grant. An expense reimbursement grant entitle us to claim reimbursement of certain qualified expenses incurred in support of our product development programs. The nature and amount of such expenses are determined by each respective grant.

We determined that government grants are outside the scope of Topic 606, Revenue from Contracts with Customers, because such grants do not involve a reciprocal transfer in which each party receives and sacrifices approximately commensurate value. Therefore, the grants meet the definition of a contribution and are non-exchange transactions. In absence of explicit US GAAP guidance on contributions received from government agencies, we apply by analogy the recognition and measurement guidance under International Accounting Standard 20, Accounting for Government Grants and Disclosure of Government Assistance. Following this approach, we recognize grants at fair value only when there is reasonable assurance that we will comply with the conditions of the grants, and that the grants will be received. We recognize as revenue the amounts received or receivable from expense reimbursement grants to the extent, and in the period in which, the qualifying costs have been incurred.

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.

Inventories

Inventories, which consist of raw materials, work-in-process and finished goods, are stated at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method. Net realizable value is determined based upon the estimated selling price of the inventory in the ordinary course of business, less reasonably predictable costs of completion or disposal and transportation. The cost of raw materials, work-in-process and finished goods generally exceeds their respective realizable value. When an inventory is adjusted to its net realizable value, a new cost basis is established and such cost is not adjusted for any potential recovery or increase in cost. Obsolete inventories are written off to cost of goods sold.

Property, Plant and Equipment, Net

Assets that are being built or constructed are recorded as construction in progress. Depreciation for those assets begins when the assets are ready for their intended use.

Expenditures for repairs and maintenance are expensed as incurred. Upon disposition, the cost and related accumulated depreciation and amortization are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations.

Impairment of Long-Lived Assets

We review the valuation of long-lived assets, which consisted mainly of property, plant and equipment, whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. The recoverability of long-lived assets or asset groups is calculated based on the estimated undiscounted future cash flows expected to result from the use and eventual disposition of the asset. An impairment loss is recognized based on the amount by which the carrying value exceeds the fair value of the asset. Fair value is determined using the estimated cash flows discounted at a rate commensurate with the risk involved.

Leases

We determine if an arrangement is a lease, or contains a lease, by evaluating whether there is an identified asset and whether we control the use of the identified asset throughout the period of use. We determine the classification of the lease, whether operating or finance lease, at the lease commencement date, which is the date we obtain control of the leased asset.

We recognize the right-of-use (“ROU”) assets and lease liabilities on the lease commencement date based upon the present value of the fixed lease payments over the non-cancelable lease term, unless it is reasonably certain that any renewal or termination option will be exercised. Variable costs, such as common area maintenance fees, property insurance and property taxes, are not included in the measurement of the ROU assets and lease liabilities, but are expensed as incurred. As the implicit rate of the leases is not determinable, we use an incremental borrowing rate in determining the present value of the lease payments. We do not recognize ROU assets on lease arrangements with a term of 12 months or less. Lease expense for such arrangements is recognized on a straight-line basis over the term of the lease. We account for the lease components and non-lease components as a single lease component. Modifications are assessed to determine whether incremental differences result in new contract terms and should be accounted for as a new lease or whether the additional right of use should be included in the original lease and continue to be accounted for with the remaining ROU asset.

Lease liabilities are increased by interest and reduced by payments each period, and the right of use asset is amortized over the lease term. For operating leases, interest on the lease liability and the amortization of the right-of-use asset result in straight-line rent expense over the lease term. For finance leases, interest on the lease liability and the amortization of the right-of-use asset results in front-loaded expense over the lease term.

Warranty Liability

We provide guarantee that products sold to customers will meet the published or agreed upon specification. Products that do not meet specification are replaced at no charge to the customer. We had no significant warranty claims based on our historical experience.

Loss Contingencies

In the normal course of business, we may be involved in claims and legal proceedings. We record a liability for such matters when it is probable that a loss has been incurred and the amounts can be reasonably estimated. When only a range of possible loss can be established, the most probable amount in the range is accrued. If no amount within this range is a better estimate than any other amount within the range, the minimum amount in the range is accrued. Legal costs associated with these loss contingencies are expensed as incurred.

Deferred Costs

Certain costs, which consist primarily of payroll-related costs, are initially deferred when (i) the costs relate directly to a customer contract, (ii) the costs generate or enhance our resources that will be used in satisfying future performance obligations, and (iii) the costs are expected to be recovered. If these criteria are not met, the costs are expensed as incurred. Deferred costs are recognized as cost of revenues in the period when the related revenue is recognized, except when the costs incurred exceed the amount expected to be recovered, in which case they are expensed as incurred. The recoverable amount is estimated to equal the amount of consideration that we have received but not yet recognized as revenue, plus the amount that we expect to receive in the future.

Cost of Revenues

Cost of revenue, which includes the cost of finished goods sold and the cost of customization design services, are comprised primarily of costs of raw materials, labor costs and the allocation of overhead costs incurred in producing batteries or performing the customization development work, and the costs of silicon anode batteries purchased from Berzelius (Nanjing) Co. Ltd., which prior to February 2022 was a subsidiary of Amprius Holdings. Labor costs consist of personnel-related expenses such as salaries, employee benefits and stock-based compensation expense. Overhead and other costs consist primarily of outside services, utilities, rent, depreciation expense and other facilities-related costs. Costs related to batteries and design services are recognized in the same period as the associated revenue is recognized. In addition, we include under cost of revenue certain non-capitalizable expenses incurred during the preliminary stage of our plan to construct a GWh-scale manufacturing facility, such as re-zoning costs and engineering studies.

Research and Development Costs

Research and development (“R&D”) costs are expensed as incurred. These costs consist mainly of personnel-related costs such as salaries, employee benefits and stock-based compensation expense of our R&D personnel, outside contractors, materials, R&D equipment for which there is no alternative future use, and allocation of overhead costs, which include utilities, rent, depreciation expense and other facilities-related costs. R&D activities relate to the conceptual formulation and design of preproduction experimental prototypes and models.

Advertising Costs

Advertising costs, which were not material during the years ended December 31, 2023 and 2022, are expensed as incurred.

Stock-Based Compensation

Since the Business Combination, after becoming a public company, the fair value of the shares of common stock underlying stock grants is determined based on the closing price of our common stock.

Amprius Holdings granted certain of its employees, directors and contract workers stock-based awards under its Equity Incentive Plan (“Amprius Holdings 2008 Stock Plan”). When we were formed, certain employees and contract workers of Amprius Holdings were transferred, or provided services, to us. We recorded the stock-based compensation costs associated with the outstanding stock-based awards granted to those individuals with a corresponding increase in additional paid-in capital.

In 2016, we adopted the 2016 Equity Incentive Plan (“2016 Plan”), which was separate from the Amprius Holdings Plan. We granted stock-based awards under the 2016 Plan to certain employees, directors and contract workers of Amprius Holdings who provided services to the Company. We recorded the stock-based compensation costs associated with those awards. In September 2022, we adopted the 2022 Equity Incentive Plan (“2022 Plan”) and terminated the 2016 Plan.

We measure stock-based compensation for stock options at fair value on the date of grant using the Black-Scholes option-pricing model. We measure stock-based compensation for restricted stock units (“RSUs”) based on the closing price of our common stock on the date of grant. We recognize stock-based compensation expense on a straight-line basis over the period from the date of the grant to the date the award is fully vested, which is generally four years. We have elected to account for forfeitures as they occur.

The Black-Scholes option-pricing model requires the use of highly subjective assumptions which determine the fair value of stock option awards. These assumptions include:

•Expected Term — The expected term of stock options represents the period that our stock-based awards are expected to be outstanding. The expected term had been derived based on the simplified method for awards that qualify as plain-vanilla options because we have no sufficient historical experience for determining the expected term.

•Expected Volatility — Since we have no sufficient trading history on our common stock, we estimate volatility by evaluating the average historical volatility of a peer group of companies for the period immediately preceding the option grant for a term that is approximately equal to the option’s expected term.

•Risk-Free Interest Rate — We base the risk-free interest rate on the implied yield available on the U.S. Treasury zero coupon issues with a remaining term equivalent to the expected term of the option.

•Expected Dividend — We have not paid dividends and have no plans to pay dividends on our common stock. Therefore, we use an expected dividend yield of zero.

The Black-Scholes option-pricing model also requires input on the fair value of the underlying common stock. There is no public market for Amprius Holdings’ common stock and prior to the Business Combination, there was no public market for Legacy Amprius’ common stock. As such, the fair value of the shares of common stock underlying stock option grants prior to the Business Combination had been determined by our board of directors at the time of grant by considering a number of objective and subjective factors including important developments in our operations, valuations performed by an independent third party, the rights, preferences, and privileges of Amprius Holdings’ preferred securities as compared to those of Legacy Amprius’ and Amprius Holdings’ common stock, including liquidation preferences of Amprius Holdings’

preferred stock, the Company’s stage of development and financial position, the market conditions affecting the industry, the stock price performance and volatility of comparable public companies, and the likelihood of achieving a liquidity event, among other factors. The third-party valuations were performed in accordance with the American Institute of Certified Public Accountants’ Accounting and Valuation Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation (the “Practice Aid”). The Practice Aid identifies various available methods for allocating the enterprise value across classes of capital stock in determining the fair value of our common stock at each valuation date. The valuations for Amprius Holdings’ common stock were prepared using the Option Pricing Method (“OPM”), and the valuations for Legacy Amprius’ common stock were prepared using the probability-weighed expected return method (“PWERM”), both of which used market approaches to estimate our enterprise value. PWERM is a hybrid method where the equity value in one or more of the scenarios is calculated using an OPM. The PWERM is a scenario-based methodology that estimates the fair value of common stock based upon an analysis of future values for the company, assuming various outcomes. The common stock value is based on the probability-weighted present value of expected future investment returns considering each of the possible outcomes available as well as the rights of each class of stock. The future value of the common stock under each outcome is discounted back to the valuation date at an appropriate risk-adjusted discount rate and probability weighted to arrive at an indication of value for the common stock. A discount for lack of marketability of the common stock is then applied to arrive at an indication of value for the common stock. The OPM treats common stock and preferred stock as call options on the total equity value of a company, with exercise prices based on the value thresholds at which the allocation among the various holders of a company’s securities changes. Under this method, the common stock has value only if the funds available for distribution to stockholders exceeded the value of the preferred stock liquidation preferences at the time of the liquidity event, such as a strategic sale or a merger.

Common Stock Warrants

We have classified our freestanding common stock warrants as equity in accordance with the applicable guidance in ASC 815-40, Derivatives and Hedging - Contracts in Entity’s Own Equity. Accordingly, a freestanding instrument, such as a stock warrant, is classified as equity when (i) the instrument is considered indexed to an entity’s own stock and (ii) when certain criteria for equity classification are met.

When assessing whether our stock warrants are indexed to our own stock, we evaluated the stock warrants’ exercise contingencies and adjustment features. The stock warrants’ exercise contingencies, which are not based on observable market or index, include restriction to exercise a portion of the stock warrants if the holder exceeds specified beneficial ownership limitations and the holder being required to exercise the stock warrants in the event of a reorganization or a warrant redemption. Since the exercise contingencies are not based on observable market or index, the stock warrants were not precluded from being considered indexed to our own stock. In addition, the stock warrants’ adjustment features, such as a change in exercise price in the event of a stock split or stock dividend and a downward adjustment on the exercise price at our discretion, did not preclude the stock warrants from being considered indexed to our own stock.

We also evaluated other provisions in the warrant agreement, such as the share-settlement provision and the replacement of the instrument in the event of a reorganization, and determined that those provisions do not preclude the stock warrants from being classified as equity.

Income Taxes

We account for income taxes in accordance with ASC 740, Income Taxes. Deferred tax balances are recognized for the estimated future tax consequences attributable to temporary differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets are also recognized for temporary differences that arise from net operating losses and credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax balances of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized.

ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. We recognize accrued interest and penalties related to unrecognized tax benefits, if any, as income tax expense.

Concurrent with the execution of the Business Combination Agreement, we and Amprius Holdings entered into a Tax Sharing Agreement which provides that with respect to any U.S. federal consolidated group of which Amprius Holdings and the Company are members, Amprius Holdings will be responsible for and will indemnify us for the tax

liability of such group. In addition, Amprius Holdings will be responsible for and will indemnify us for state taxes of any consolidated, combined or unitary tax group for state tax purposes that includes Amprius Holdings and the Company. The Tax Sharing Agreement also provides that Amprius Holdings will generally control any tax returns and any tax audits or other proceedings for the taxes addressed by the Tax Sharing Agreement. The Tax Sharing Agreement did not have a material impact and is not expected to have a material impact on our future results of operations.

Prior to the Business Combination, any income taxes in our financial statements have been allocated in a manner that is systematic, rational and consistent. Our results of operations had historically been included in Amprius Holdings’ combined U.S. income tax returns. Since the Company and Amprius Holdings were members of a consolidated group for federal and state income tax purposes prior to the Business Combination, the net operating loss carryover of the consolidated group would be available to be utilized by either us or other members for periods prior to the Business Combination.

Since we did not file separate income tax returns from Amprius Holdings prior to the Business Combination, payments to certain tax authorities during the periods prior to the Business Combination may have been made directly by Amprius Holdings, and not by us. For tax jurisdictions where we were included with Amprius Holdings’ consolidated tax filings, we did not recognize a tax payable to or from Amprius Holdings, and the payments of taxes were deemed to be settled immediately with the legal entities paying for the taxes in the respective tax jurisdictions.

Net Loss Per Share

Basic net loss per share of common stock is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, without consideration of potentially dilutive securities. Diluted net loss per share of common stock is calculated by dividing the net loss attributable to common stockholders by the sum of the weighted-average number of shares of common stock outstanding and potentially dilutive securities during the period. Potentially dilutive securities include shares issuable upon the exercise of stock options, vesting of RSUs and exercise of common stock warrants; however, these have been excluded from the diluted net loss per share calculation because their effect were anti-dilutive given our net loss. Therefore, the basic and diluted net loss per share of common stock for all periods presented were the same.

Recently Adopted/Not Yet Adopted Accounting Standards

Recent Accounting Pronouncements

Adopted

On January 1, 2023, we adopted the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and related amendment under ASU 2019-10, which requires that credit losses on financial assets, such as trade and other receivables, be recognized as allowance for credit losses. Credit losses on trade and other receivables will reflect the current estimate of the expected credit losses that generally will result in the earlier recognition of allowance for credit losses. The adoption of this ASU did not have a material impact on our consolidated financial statements.

Not Yet Adopted

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU requires entities to disclose, among others, (i) specific categories in the rate reconciliation table (ii) additional information for reconciling items that meet a quantitative threshold and (iii) the amount of income taxes paid on a disaggregated level. This ASU is required to be adopted on a prospective basis. As an emerging growth company, this ASU is effective starting on our annual reporting for the year ending December 31, 2026. 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 disclosure.

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU requires entities to disclose, among others, (i) significant segment expenses that are regularly provided to the CODM for measuring segment profit or loss, (ii) amounts for other significant items by reportable segment and (iii) an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding resource allocation. This ASU is required to be adopted on a retrospective basis starting on our annual reporting for the year ending December 31, 2024. Early adoption is permitted. We are currently evaluating this ASU. We believe that the impact of the additional required disclosures will enhance our financial statement disclosure.