Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These consolidated financial statements included herein have been prepared by the Company pursuant to the rules and regulations of the SEC applicable to year end financial information. As of January 1, 2025, the Company became a U.S. Domestic Issuer, as defined by the SEC. Upon becoming a U.S. Domestic Issuer, and including the report herein, the Company has prepared its consolidated financial statements in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”) for all periods presented. These financial statements are presented in thousands of United States Dollars unless otherwise noted. There are certain disclosures where the Company discloses the amount in Canadian Dollars (“CAD,”) as this is the currency in which the instrument is denominated.
Principles of Consolidation	Principles of Consolidation These financial statements incorporate the financial statements of the Company and its controlled subsidiaries. The Company consolidates entities that it controls due to ownership of a majority voting interest and consolidates variable interest entities (“VIEs”) when it is the primary beneficiary. All intercompany transactions and balances have been eliminated. The Company has a 70% interest in the Alta Mesa Central Processing Plant (“CPP”) and Wellfield project (“Alta Mesa” or the “Alta Mesa Project”) with Boss Energy Limited (“Boss” or “Boss Energy”) owning the remaining 30%. The Company retained control after Boss acquired its interest in February 2024. Alta Mesa is considered a VIE, with the Company being considered the primary beneficiary. As a result, the Company consolidates the operations of Alta Mesa with an offsetting non-controlling interest being recorded. Refer to Note 8 – Sale of Minority Interest in Alta Mesa for more information related to the Boss transaction. Non-controlling interests represent the portion of their equity which is not attributable, directly or indirectly, to the Company. These amounts are required to be reported as equity instead of as a liability on the consolidated balance sheets. Financial Accounting Standards Board (the “FASB”) Accounting Standard Codification (“ASC”) Topic 810, Consolidation requires net income or loss from non-controlling interests to be shown separately on the consolidated statements of operations.
Segments	Segments Operating segments are defined as components of an entity for which discrete financial information is available and is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in making decisions regarding resource allocation and performance assessment. The Company’s CODM is the Chief Executive Officer. The Company has one operating segment and one reportable segment. This reportable segment relates to uranium extraction, recovery and sales of uranium from mineral properties along with the exploration, permitting and evaluation of uranium properties in the United States. The CODM assesses financial performance and decides how to allocate resources based on performance of mineral properties and the sale of uranium.
Mineral Rights and Properties	Mineral Rights and Properties We have established the existence of mineralized materials for certain uranium projects, including our Rosita Uranium Project (“Rosita” or “Rosita Project”) and Alta Mesa Project (collectively, the “ISR Projects”). We have not established proven or probable reserves, as defined by S-K 1300, through the completion of a “final” or “bankable” feasibility study for any of the uranium projects we operate, including our ISR Projects. As a result, and despite the fact that we commenced the extraction of mineralized materials at our ISR Projects, we remain an Exploration Stage Issuer, as defined by the SEC, and will continue to remain as an Exploration Stage Issuer until such time that proven or probable reserves have been established. As an Exploration Stage Issuer, expenditures relating to the acquisition of mineral rights are initially capitalized as incurred while exploration and pre-extraction expenditures are expensed as incurred until such time as we exit the Exploration Stage by establishing proven or probable reserves. Expenditures relating to exploration activities, such as drill programs to establish mineralized materials, are expensed as incurred. Expenditures relating to pre-extraction activities, such as the construction of mine wellfields, ion exchange (“IX”) facilities and disposal wells, are expensed as incurred until such time that proven or probable reserves are established for that project, after which expenditures relating to mine development activities for that particular project are capitalized as incurred. The Company presents construction and drilling costs within the exploration costs related to mineral properties in the investing cash flows section of the consolidated statements of cash flows. The remaining costs (e.g. maintenance and lease fees) are included in the operating cash flows section of the consolidated statements of cash flows. When the Company starts to extract mineralized materials at our ISR Projects, the capitalized costs are depleted over estimated mineral resources using the units-of-production method. Depletion costs are capitalized to inventory then included in cost of sales as the inventory is sold on the consolidated statements of operations.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make judgments, estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported revenues and expenses during the reported periods. Areas requiring significant judgments, estimates, and assumptions include the valuation of acquired mineral rights and properties, equity-method accounted investments, existence of impairment indicators for the Company’s long-lived assets, valuation and measurement of impairment losses on mineral rights and properties, valuation of asset retirement obligations, and valuation of stock options, share purchase warrants and share-based compensation. Other areas requiring estimates include depletion and amortization of mineral rights and properties and depreciation of property, plant and equipment. Actual results could differ significantly from those estimates and assumptions.
Foreign Currency	Foreign Currency These financial statements are presented in U.S. Dollars, unless otherwise specified. The functional currency of enCore Energy Corp. is the Canadian Dollar. The functional currency of the Company’s subsidiaries is the U.S. Dollar based on the currency of the primary economic environment in which these subsidiaries operate. Foreign currency transactions are translated into the functional currency using the exchange rates prevailing at the date of the transaction. Foreign currency monetary items are translated at the period-end exchange rate. Non-monetary items measured at historical cost continue to be carried at the exchange rate at the date of the transaction. Non-monetary items measured at fair value are reported at the exchange rate at the date when fair values were determined. Exchange differences arising on the translation of monetary items or on settlement of monetary items are recognized in profit or loss in the period in which they arise. Exchange differences arising on the translation of non-monetary items are recognized in other comprehensive loss in the consolidated statements of comprehensive loss to the extent that gains and losses arising on those non-monetary items are also recognized in other comprehensive loss. When the non-monetary gain or loss is recognized in profit or loss, the exchange component is also recognized in profit or loss. On consolidation, the Company’s financial statements are translated into the presentation currency, being the U.S. Dollar. Assets and liabilities are translated at the period-end exchange rate. Income and expenses are translated at the average exchange rate for the period in which they arise. Exchange differences are recognized in accumulated comprehensive loss as a separate component within total stockholders’ equity, net of any related income tax effects, on the consolidated balance sheets.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents consist of bank deposits and term deposits with an original maturity of three months or less. Restricted cash is excluded from cash and cash equivalents and is included in long-term assets. Restricted cash relates to collateralization of the Company’s performance obligations with an unrelated third party, also known as performance bonds. These funds are not available for the payment of general corporate obligations. The performance bonds are required for future restoration and reclamation obligations related to the Company’s operations.
Inventory, net	Inventory, net Inventory, net includes uranium concentrates and converted products including chemicals and are measured at the lower of cost and net realizable value. The cost of converted products and uranium concentrates is based on the first in first out method. Cost includes direct materials, direct labor and operational overhead expenses. Net realizable value is the estimated selling price in the ordinary course of business, less the estimated costs of completion and selling expenses. Consumable supplies and spares are valued at the lower of cost or replacement value.
Marketable Securities	Marketable Securities Marketable equity securities consist of investments in publicly traded equity securities. The Company classifies and accounts for its marketable equity securities as available-for-sale. Subsequent to initial recognition, marketable equity securities are measured at fair value and changes therein are recognized as a component of loss on marketable securities, unrealized, in the consolidated statements of operations.
Equity Method Investments	Equity Method Investments Investments in an entity in which our ownership is greater than 20% but less than 50%, a 50/50 joint venture which the Company does not control, or an entity where other facts and circumstances indicate that we have the ability to exercise significant influence over its operating and financing policies, are accounted for using the equity method in accordance with FASB ASC Topic 323, Investments – Equity Method and Joint Ventures. The Company accounts for equity method investments over which the Company exerts significant influence, but not control, over the financial and operating policies through the fair value option of FASB ASC Topic 825, Financial Instruments. The fair value of the investee’s common shares is measured based on its closing market price. Subsequent to initial recognition, equity method investments are measured at fair value and changes therein are recognized as a component of loss on marketable securities, unrealized in the consolidated statements of operations.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment is measured at cost less accumulated depreciation.
Intangible Assets	Intangible Assets Intangible assets consist of a data access agreement and data purchases, which are definite- and indefinite-lived assets, respectively. Definite-lived intangible assets are amortized over 14 years on a straight-line basis. The Company reviews its definite-lived intangible assets for impairment when impairment indicators exist. When impairment indicators exist, the Company determines if the carrying value of its definite-lived intangible assets or asset groups exceeds the related undiscounted future cash flows. In cases where the carrying value exceeds the undiscounted future cash flows, the carrying value is written down to fair value. Fair value is determined using a discounted cash flow analysis. The Company assesses its indefinite-lived intangible assets for impairment periodically to determine if any adverse conditions exist that would indicate impairment or when impairment indicators exist. The Company assesses its indefinite-lived intangible assets for impairment at least annually by comparing the fair value of the indefinite-lived intangible assets to their carrying value.
Impairment of Long-lived Assets	Impairment of Long-lived Assets The Company reviews and evaluates its long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Mineral rights and properties are monitored for impairment based on factors such as uranium prices, government regulations, our continued right to explore the area, exploration reports, assays, technical reports, drill results and continued plans to fund exploration and development programs on the property. On each reporting date, the Company conducts a review of potential triggering events for all its mineral rights and properties. When events or changes in circumstances indicate that the related carrying amounts may not be recoverable, the Company carries out a review and evaluation of its long-lived assets in accordance with its accounting policy. Impairment losses are recognized as part of operating losses in the consolidated statements of operations. Recoverability is measured by comparing the undiscounted future net cash flows to the net book value. When the net book value exceeds future net undiscounted cash flows, the fair value is compared to the net book value and an impairment loss may be measured and recorded based on the excess of the net book value over fair value. Fair value for mineral rights and properties prior to extraction is based on a combined approach of a discounted cash flow analysis and a market approach. Future cash flows are estimated based on quantities of recoverable mineralized material, expected uranium prices (considering current and historical prices, trends and estimates), production levels, operating costs, capital requirements and reclamation costs, all based on the life-of-mine project plans. In estimating future cash flows, assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of future cash flows from other asset groups. The Company's estimates of future cash flows are based on numerous assumptions, and it is possible that actual future cash flows will be significantly different than the estimates, as actual future quantities of recoverable minerals, uranium prices, production levels, costs and capital are each subject to significant risks and uncertainties.
Operating Leases	Operating Leases The Company accounts for office leases under FASB ASC Topic 842, Leases, which requires leases to be recognized as assets and liabilities on the balance sheet for the rights and obligations created by all leases with terms of more than 12 months. The Company recognizes in the balance sheet a liability to make lease payments (the lease liability) and the right-of-use asset representing the right to the underlying asset for the lease term. For leases with a term of twelve months or less, the Company has made an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The office leases all meet the definition of an operating lease.
Income Taxes	Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recorded based on differences between the financial statement carrying values of existing assets and liabilities and their respective income tax bases (temporary differences), and losses carried forward. Deferred income tax assets and liabilities are measured using the enacted tax rates which will be in effect when the temporary differences are likely to reverse. The effect on deferred income tax assets and liabilities of a change in tax rates is included in operations in the period in which the change is enacted. The Company records a valuation allowance to reduce deferred income tax assets to the amount that is believed more likely than not to be realized. When the Company concludes that all or part of the deferred income tax assets are not realizable in the future, the Company makes an adjustment to the valuation allowance that is charged to income tax benefit in the period such determination is made.
Asset Retirement Obligations	Asset Retirement Obligations Various federal and state laws and regulations require our Company to reclaim the surface areas and restore groundwater quality to regulatory standards after the completion of extraction. We recognize the present value of the future restoration and remediation costs as an asset retirement obligation in the period in which we incur an obligation associated with the retirement of tangible long-lived assets that result from the acquisition, construction, development and/or normal use of the assets. Asset retirement obligations (“ARO”) consist of estimated final well closure, plant and equipment decommissioning and removal and environmental remediation costs to be incurred by our Company in the future. The asset retirement obligation is estimated based on the current costs escalated at an inflation rate and discounted at a credit adjusted risk-free rate at inception. The asset retirement obligations are capitalized as part of the costs of the underlying assets and amortized over their remaining useful life. The asset retirement obligations are accreted to an undiscounted value until they are settled. The accretion expenses are charged to depreciation, amortization, and accretion on the consolidated statement of operations and the actual retirement costs are recorded against the asset retirement obligations when incurred.
Convertible Senior Notes	Convertible Senior Notes The Company accounts for its convertible senior notes in accordance with ASC 470, Debt. The convertible senior notes are accounted for as a single liability measured at amortized cost, as no features does not require bifurcation. Debt issuance costs are recorded as a direct deduction from the carrying amount of the notes and amortized to interest expense over the contractual term using the effective interest method. Interest expense includes both the contractual coupon and the amortization of debt issuance costs. The convertible senior notes are classified as long-term debt in the consolidated balance sheets unless amounts become due within twelve months. In connection with the issuance of the convertible senior notes, the Company entered into capped call transactions, which are accounted for separately as equity instruments in the consolidated balance sheets.
Share-based Compensation	Share-based Compensation We measure share-based awards, typically options and restricted stock units, at fair value on the date of the grant and expense the awards over the requisite service period of employees, brokers or consultants. The fair value of these stock options is measured at the grant date using the Black-Scholes option pricing model. The fair value of restricted stock units is measured at the fair value of our common shares based on the market price at the date of the grant. The share-based awards are equity-classified. Share-based compensation expense related to awards with only service conditions having a graded vesting schedule is recorded on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award were, in substance, multiple awards, while expense for all other awards are recognized on a straight-line basis. The Company’s estimates may be impacted by certain variables including, but not limited to, stock price volatility, employee stock option exercise behaviors, additional stock option grants, the Company’s performance and related tax impacts.
Warrants	Warrants Warrants that are issued with shares issued have the proceeds allocated between the shares and the warrants based on their relative fair value. The fair value of the warrants is measured at the grant date using the Black-Scholes option pricing model. The fair value of the shares granted is based on the respective share’s publicly-traded market price. Warrants issued to brokers are measured at their fair value on the vesting date. The fair value of stock options and warrants issued to brokers are estimated using the Black-Scholes option pricing model.
Financial Instruments	Financial Instruments Financial assets and liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Financial assets and liabilities are recognized when the rights to receive or obligation to pay cash flows from the assets or liabilities have expired or been settled or have been transferred and the Company has transferred substantially all risks and rewards of ownership. The Company classifies its financial instruments in the following categories: at fair value through profit and loss (“FVTPL”), at fair value through other comprehensive loss (“FVTOCI”), or at amortized cost. The Company determines the classification of financial assets at initial recognition. The classification of debt instruments is driven by the Company’s business model for managing the financial assets and their contractual cash flow characteristics. Equity instruments that are held for trading are classified as FVTPL. For other equity instruments, on the day of acquisition the Company can make an irrevocable election (on an instrument-by instrument basis) to designate them at FVTOCI. Financial liabilities are measured at amortized cost, unless they are required to be measured at FVTPL (such as debt) or the Company has opted to measure them at FVTPL. Financial assets and liabilities carried at FVTPL are initially recorded at fair value and transaction costs are expensed in profit or loss. Realized and unrealized gains and losses arising from changes in the fair value of the financial assets and liabilities held at FVTPL are included in the consolidated statements of operations in the period in which they arise.
Revenue Recognition and Accounts Receivables	Revenue Recognition and Accounts Receivables Our revenues are primarily derived from the sale of uranium concentrates under contracts with major U.S. utilities. Revenue is recognized when delivery is evidenced by book transfer at the applicable uranium storage facility. The sales contracts specify the quantity to be delivered, the price, payment terms and the year of the delivery. Under these contracts, each product delivered to the customer represents a separate performance obligation. The Company's contracts with its customers include minimum quantities to be delivered over terms greater than one year and may include fixed prices, market-based prices, and other variable pricing. In many contracts the variable consideration is allocated entirely to a wholly unsatisfied performance obligation, having met the criteria to do so. Other contracts may require certain variable consideration to be estimated and constrained as part of the transaction price. Under the Company’s uranium contracts, it invoices customers after the performance obligations have been satisfied, at which point payment is unconditional. Accordingly, the Company’s uranium contracts generally do not give rise to contract assets or liabilities. The Company applies the optional exemption not to disclose the remaining transaction price that is variable and allocated to wholly unsatisfied future quantities. The Company expects to recognize revenue related to fixed and unconstrained variable consideration of $117,895 through December 31, 2028, and $205,620 thereafter under the non-cancelable portion of these contracts. Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The Company evaluates its estimate of expected credit losses based on historical experience and current and forecasted future economic conditions for each portfolio of customers.
Concentrations of Credit Risk and Major Customers	Concentrations of Credit Risk and Major Customers The Company’s revenues are concentrated among a limited number of customers. For the year ended December 31, 2025, three customers accounted for approximately 63%, 25%, and 11% of total revenues. No other customer exceeded more than 10% of total revenues. For the year ended December 31, 2024, one customer accounted for approximately 77% of total revenues, and another customer accounted for approximately 23% of total revenues. No other customer exceeded more than 10% of the Company’s total revenue during the years ended December 31, 2025 and 2024. As of December 31, 2025, one customer represented 100% of total trade accounts receivable. As of December 31, 2024, the Company did not have trade accounts receivable outstanding. The Company does not generally require collateral from its customers. Geographic Concentrations Substantially all of the Company’s revenues for the years ended December 31, 2025 and 2024 were derived from customers in the United States. As of December 31, 2025, substantially all trade accounts receivable were due from customers in the United States. The Company did not have significant revenues or receivables from customers outside the United States during the years ended December 31, 2025 and 2024
Loss per Share	Loss per Share Basic earnings or loss per share includes no potential dilution and is computed by dividing the earnings or loss attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings or loss per share reflects the potential dilution of securities that could share in the earnings or loss of our Company. Securities are excluded from the calculation of our diluted weighted average common shares outstanding if their effect would be anti-dilutive based on the treasury stock method or due to a net loss from continuing operations. Potential dilutive securities include stock options, restricted stock units, warrants and the Convertible Senior Notes (as defined below), which are excluded from the calculation of our diluted weighted average common shares outstanding as their effect would be anti-dilutive due to a net loss from continuing operations for the years ended December 31, 2025 and 2024. The Capped Calls Transactions (as defined below) are excluded from the loss per share diluted calculation because under U.S. GAAP purchased puts and calls are ignored in both basic and diluted loss per share.
Non-controlling Interests	Non-controlling Interests Non-controlling interests are measured at their proportionate share of the acquiree’s identifiable net assets at the acquisition date and are adjusted at each reporting date for the net income (loss) attributable to that non-controlling interest during that period. The difference between the cash received and the proportionate share of the acquiree’s identifiable net assets is attributed to additional paid-in-capital.
Recently Adopted and Issued Accounting Standards	Recently Adopted and Issued Accounting Standards Recently Adopted Accounting Standards In March 2024, the FASB issued ASU 2023-09, Income Taxes (Topic 740)-Improvements to Income Tax Disclosures. The ASU requires additional quantitative and qualitative income tax disclosures to allow readers of the consolidated financial statements to assess how the Company’s operations, related tax risks and tax planning affect its tax rate and prospects for future cash flows. For public business entities, the ASU was effective for annual periods beginning after December 15, 2024. The Company adopted this effective January 1, 2025. Adoption impacted disclosures but were not material to the Company's consolidated financial statements. Recently Issued Accounting Standards In November 2024, the FASB issued ASU 2024‑03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220‑40): Disaggregation of Income Statement Expenses. This ASU requires public business entities to disclose, in the notes to the financial statements, disaggregated information about certain expense categories included within income statement captions, without changing the presentation of the income statement. The guidance is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting this ASU on its consolidated financial statements and related disclosures. In July 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2025‑05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. This ASU provides a practical expedient that permits entities to assume that current conditions as of the balance sheet date will remain unchanged for the remaining life of current accounts receivable and current contract assets arising from transactions accounted for under Topic 606. The guidance is effective for annual reporting periods beginning after December 15, 2025, including interim reporting periods within those annual periods. The Company did not elect to use the practical expedient as of December 31, 2025.
Fair Value	Fair Value Fair value accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: •Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical unrestricted assets or liabilities; •Level 2 - Quoted prices in markets that are not active, quoted prices for similar assets or liabilities in active markets, quoted prices or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability, and model-based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and •Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity). The financial instruments, including cash and cash equivalents, accounts and other receivables, restricted cash, accounts payable and accrued liabilities, are carried at cost, which approximates their fair values due to the immediate or short-term maturity. The Company’s investments in equity securities are publicly traded stocks measured at fair value and classified within Level 1 in the fair value hierarchy. Level 1 equity securities use quoted prices for identical assets in active markets. The Company’s investments include certain investments accounted for at fair value consisting of warrants that are valued using the Black-Scholes option model based on observable inputs and as such are classified within Level 2 of the hierarchy. The warrant asset is included in marketable securities, long-term on the consolidated balance sheets. The Company’s Convertible Senior Notes due 2030 (the “Convertible Senior Notes”) debt component was fair valued utilizing a 6.6% discount rate, which is the Company’s estimate of the market discount rate for this arrangement. This is classified within Level 2 of the hierarchy.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2025

These consolidated financial statements included herein have been prepared by the Company pursuant to the rules and regulations of the SEC applicable to year end financial information. As of January 1, 2025, the Company became a U.S. Domestic Issuer, as defined by the SEC. Upon becoming a U.S. Domestic Issuer, and including the report herein, the Company has prepared its consolidated financial statements in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”) for all periods presented.

These financial statements are presented in thousands of United States Dollars unless otherwise noted. There are certain disclosures where the Company discloses the amount in Canadian Dollars (“CAD,”) as this is the currency in which the instrument is denominated.

Principles of Consolidation

These financial statements incorporate the financial statements of the Company and its controlled subsidiaries. The Company consolidates entities that it controls due to ownership of a majority voting interest and consolidates variable interest entities (“VIEs”) when it is the primary beneficiary. All intercompany transactions and balances have been eliminated.

The Company has a 70% interest in the Alta Mesa Central Processing Plant (“CPP”) and Wellfield project (“Alta Mesa” or the “Alta Mesa Project”) with Boss Energy Limited (“Boss” or “Boss Energy”) owning the remaining 30%. The Company retained control after Boss acquired its interest in February 2024. Alta Mesa is considered a VIE, with the Company being considered the primary beneficiary. As a result, the Company consolidates the operations of Alta Mesa with an offsetting non-controlling interest being recorded. Refer to Note 8 – Sale of Minority Interest in Alta Mesa for more information related to the Boss transaction.

Non-controlling interests represent the portion of their equity which is not attributable, directly or indirectly, to the Company. These amounts are required to be reported as equity instead of as a liability on the consolidated balance sheets. Financial Accounting Standards Board (the “FASB”) Accounting Standard Codification (“ASC”) Topic 810, Consolidation requires net income or loss from non-controlling interests to be shown separately on the consolidated statements of operations.

Segments

Operating segments are defined as components of an entity for which discrete financial information is available and is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in making decisions regarding resource allocation and performance assessment. The Company’s CODM is the Chief Executive Officer. The Company has one operating segment and one reportable segment. This reportable segment relates to uranium extraction, recovery and sales of uranium from mineral properties along with the exploration, permitting and

evaluation of uranium properties in the United States. The CODM assesses financial performance and decides how to allocate resources based on performance of mineral properties and the sale of uranium.

Mineral Rights and Properties

We have established the existence of mineralized materials for certain uranium projects, including our Rosita Uranium Project (“Rosita” or “Rosita Project”) and Alta Mesa Project (collectively, the “ISR Projects”). We have not established proven or probable reserves, as defined by S-K 1300, through the completion of a “final” or “bankable” feasibility study for any of the uranium projects we operate, including our ISR Projects. As a result, and despite the fact that we commenced the extraction of mineralized materials at our ISR Projects, we remain an Exploration Stage Issuer, as defined by the SEC, and will continue to remain as an Exploration Stage Issuer until such time that proven or probable reserves have been established.

As an Exploration Stage Issuer, expenditures relating to the acquisition of mineral rights are initially capitalized as incurred while exploration and pre-extraction expenditures are expensed as incurred until such time as we exit the Exploration Stage by establishing proven or probable reserves. Expenditures relating to exploration activities, such as drill programs to establish mineralized materials, are expensed as incurred. Expenditures relating to pre-extraction activities, such as the construction of mine wellfields, ion exchange (“IX”) facilities and disposal wells, are expensed as incurred until such time that proven or probable reserves are established for that project, after which expenditures relating to mine development activities for that particular project are capitalized as incurred. The Company presents construction and drilling costs within the exploration costs related to mineral properties in the investing cash flows section of the consolidated statements of cash flows. The remaining costs (e.g. maintenance and lease fees) are included in the operating cash flows section of the consolidated statements of cash flows.

When the Company starts to extract mineralized materials at our ISR Projects, the capitalized costs are depleted over estimated mineral resources using the units-of-production method. Depletion costs are capitalized to inventory then included in cost of sales as the inventory is sold on the consolidated statements of operations.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make judgments, estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported revenues and expenses during the reported periods. Areas requiring significant judgments, estimates, and assumptions include the valuation of acquired mineral rights and properties, equity-method accounted investments, existence of impairment indicators for the Company’s long-lived assets, valuation and measurement of impairment losses on mineral rights and properties, valuation of asset retirement obligations, and valuation of stock options, share purchase warrants and share-based compensation. Other areas requiring estimates include depletion and amortization of mineral rights and properties and depreciation of property, plant and equipment. Actual results could differ significantly from those estimates and assumptions.

Foreign Currency

These financial statements are presented in U.S. Dollars, unless otherwise specified. The functional currency of enCore Energy Corp. is the Canadian Dollar. The functional currency of the Company’s subsidiaries is the U.S. Dollar based on the currency of the primary economic environment in which these subsidiaries operate.

Foreign currency transactions are translated into the functional currency using the exchange rates prevailing at the date of the transaction. Foreign currency monetary items are translated at the period-end exchange rate. Non-monetary items measured at historical cost continue to be carried at the exchange rate at the date of the transaction. Non-monetary items measured at fair value are reported at the exchange rate at the date when fair values were determined.

Exchange differences arising on the translation of monetary items or on settlement of monetary items are recognized in profit or loss in the period in which they arise. Exchange differences arising on the translation of non-monetary items are recognized in other comprehensive loss in the consolidated statements of comprehensive loss to the extent that gains and losses arising on those non-monetary items are also recognized in other comprehensive loss. When the non-monetary gain or loss is recognized in profit or loss, the exchange component is also recognized in profit or loss.

On consolidation, the Company’s financial statements are translated into the presentation currency, being the U.S. Dollar. Assets and liabilities are translated at the period-end exchange rate. Income and expenses are translated at the average exchange rate for the period in which they arise. Exchange differences are recognized in accumulated comprehensive loss as a separate component within total stockholders’ equity, net of any related income tax effects, on the consolidated balance sheets.

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents consist of bank deposits and term deposits with an original maturity of three months or less. Restricted cash is excluded from cash and cash equivalents and is included in long-term assets. Restricted cash relates to collateralization of the Company’s performance obligations with an unrelated third party, also known as performance bonds. These funds are not available for the payment of general corporate obligations. The performance bonds are required for future restoration and reclamation obligations related to the Company’s operations.

Inventory, net

Inventory, net includes uranium concentrates and converted products including chemicals and are measured at the lower of cost and net realizable value. The cost of converted products and uranium concentrates is based on the first in first out method. Cost includes direct materials, direct labor and operational overhead expenses. Net realizable value is the estimated selling price in the ordinary course of business, less the estimated costs of completion and selling expenses. Consumable supplies and spares are valued at the lower of cost or replacement value.

Marketable Securities

Marketable equity securities consist of investments in publicly traded equity securities. The Company classifies and accounts for its marketable equity securities as available-for-sale. Subsequent to initial recognition, marketable equity securities are measured at fair value and changes therein are recognized as a component of loss on marketable securities, unrealized, in the consolidated statements of operations.

Equity Method Investments

Investments in an entity in which our ownership is greater than 20% but less than 50%, a 50/50 joint venture which the Company does not control, or an entity where other facts and circumstances indicate that we have the ability to exercise significant influence over its operating and financing policies, are accounted for using the equity method in accordance with FASB ASC Topic 323, Investments – Equity Method and Joint Ventures.

The Company accounts for equity method investments over which the Company exerts significant influence, but not control, over the financial and operating policies through the fair value option of FASB ASC Topic 825, Financial Instruments. The fair value of the investee’s common shares is measured based on its closing market price. Subsequent to initial recognition, equity method investments are measured at fair value and changes therein are recognized as a component of loss on marketable securities, unrealized in the consolidated statements of operations.

Property, Plant and Equipment

Property, plant and equipment is measured at cost less accumulated depreciation.

Intangible Assets

Intangible assets consist of a data access agreement and data purchases, which are definite- and indefinite-lived assets, respectively. Definite-lived intangible assets are amortized over 14 years on a straight-line basis.

The Company reviews its definite-lived intangible assets for impairment when impairment indicators exist. When impairment indicators exist, the Company determines if the carrying value of its definite-lived intangible assets or asset groups exceeds the related undiscounted future cash flows. In cases where the carrying value exceeds the undiscounted future cash flows, the carrying value is written down to fair value. Fair value is determined using a discounted cash flow analysis.

The Company assesses its indefinite-lived intangible assets for impairment periodically to determine if any adverse conditions exist that would indicate impairment or when impairment indicators exist. The Company assesses its indefinite-lived intangible assets for impairment at least annually by comparing the fair value of the indefinite-lived intangible assets to their carrying value.

Impairment of Long-lived Assets

The Company reviews and evaluates its long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Mineral rights and properties are monitored for impairment based on factors such as uranium prices, government regulations, our continued right to explore the area, exploration reports, assays, technical reports, drill results and continued plans to fund exploration and development programs on the property.

On each reporting date, the Company conducts a review of potential triggering events for all its mineral rights and properties. When events or changes in circumstances indicate that the related carrying amounts may not be recoverable, the Company carries out a review and evaluation of its long-lived assets in accordance with its accounting policy. Impairment losses are recognized as part of operating losses in the consolidated statements of operations.

Recoverability is measured by comparing the undiscounted future net cash flows to the net book value. When the net book value exceeds future net undiscounted cash flows, the fair value is compared to the net book value and an impairment loss may be measured and recorded based on the excess of the net book value over fair value. Fair value for mineral rights and properties prior to extraction is based on a combined approach of a discounted cash flow analysis and a market approach.

Future cash flows are estimated based on quantities of recoverable mineralized material, expected uranium prices (considering current and historical prices, trends and estimates), production levels, operating costs, capital requirements and reclamation costs, all based on the life-of-mine project plans. In estimating future cash flows, assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of future cash flows from other asset groups. The Company's estimates of future cash flows are based on numerous assumptions, and it is possible that actual future cash flows will be significantly different than the estimates, as actual future quantities of recoverable minerals, uranium prices, production levels, costs and capital are each subject to significant risks and uncertainties.

Operating Leases

The Company accounts for office leases under FASB ASC Topic 842, Leases, which requires leases to be recognized as assets and liabilities on the balance sheet for the rights and obligations created by all leases with terms of more than 12 months. The Company recognizes in the balance sheet a liability to make lease payments (the lease liability) and the right-of-use asset representing the right to the underlying asset for the lease term. For leases with a term of twelve months or less, the Company has made an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The office leases all meet the definition of an operating lease.

Income Taxes

The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recorded based on differences between the financial statement carrying values of existing assets and liabilities and their respective income tax bases (temporary differences), and losses carried forward. Deferred income tax assets and liabilities are measured using the enacted tax rates which will be in effect when the temporary differences are likely to reverse. The effect on deferred income tax assets and liabilities of a change in tax rates is included in operations in the period in which the change is enacted.

The Company records a valuation allowance to reduce deferred income tax assets to the amount that is believed more likely than not to be realized. When the Company concludes that all or part of the deferred income tax assets are not realizable in the future, the Company makes an adjustment to the valuation allowance that is charged to income tax benefit in the period such determination is made.

Asset Retirement Obligations

Various federal and state laws and regulations require our Company to reclaim the surface areas and restore groundwater quality to regulatory standards after the completion of extraction. We recognize the present value of the future restoration and remediation costs as an asset retirement obligation in the period in which we incur an obligation associated with the retirement of tangible long-lived assets that result from the acquisition, construction, development and/or normal use of the assets.

Asset retirement obligations (“ARO”) consist of estimated final well closure, plant and equipment decommissioning and removal and environmental remediation costs to be incurred by our Company in the future. The asset retirement obligation is estimated based on the current costs escalated at an inflation rate and discounted at a credit adjusted risk-free rate at inception. The asset retirement obligations are capitalized as part of the costs of the underlying assets and amortized over their remaining useful life. The asset retirement obligations are

accreted to an undiscounted value until they are settled. The accretion expenses are charged to depreciation, amortization, and accretion on the consolidated statement of operations and the actual retirement costs are recorded against the asset retirement obligations when incurred.

Convertible Senior Notes

The Company accounts for its convertible senior notes in accordance with ASC 470, Debt. The convertible senior notes are accounted for as a single liability measured at amortized cost, as no features does not require bifurcation. Debt issuance costs are recorded as a direct deduction from the carrying amount of the notes and amortized to interest expense over the contractual term using the effective interest method. Interest expense includes both the contractual coupon and the amortization of debt issuance costs. The convertible senior notes are classified as long-term debt in the consolidated balance sheets unless amounts become due within twelve months.

In connection with the issuance of the convertible senior notes, the Company entered into capped call transactions, which are accounted for separately as equity instruments in the consolidated balance sheets.

Share-based Compensation

We measure share-based awards, typically options and restricted stock units, at fair value on the date of the grant and expense the awards over the requisite service period of employees, brokers or consultants. The fair value of these stock options is measured at the grant date using the Black-Scholes option pricing model. The fair value of restricted stock units is measured at the fair value of our common shares based on the market price at the date of the grant. The share-based awards are equity-classified.

Share-based compensation expense related to awards with only service conditions having a graded vesting schedule is recorded on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award were, in substance, multiple awards, while expense for all other awards are recognized on a straight-line basis.

The Company’s estimates may be impacted by certain variables including, but not limited to, stock price volatility, employee stock option exercise behaviors, additional stock option grants, the Company’s performance and related tax impacts.

Warrants

Warrants that are issued with shares issued have the proceeds allocated between the shares and the warrants based on their relative fair value. The fair value of the warrants is measured at the grant date using the Black-Scholes option pricing model. The fair value of the shares granted is based on the respective share’s publicly-traded market price.

Warrants issued to brokers are measured at their fair value on the vesting date. The fair value of stock options and warrants issued to brokers are estimated using the Black-Scholes option pricing model.

Financial Instruments

Financial assets and liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Financial assets and liabilities are recognized when the rights to receive or obligation to pay cash flows from the assets or liabilities have expired or been settled or have been transferred and the Company has transferred substantially all risks and rewards of ownership.

The Company classifies its financial instruments in the following categories: at fair value through profit and loss (“FVTPL”), at fair value through other comprehensive loss (“FVTOCI”), or at amortized cost. The Company determines the classification of financial assets at initial recognition. The classification of debt instruments is driven by the Company’s business model for managing the financial assets and their contractual cash flow characteristics. Equity instruments that are held for trading are classified as FVTPL. For other equity instruments, on the day of acquisition the Company can make an irrevocable election (on an instrument-by instrument basis) to

designate them at FVTOCI. Financial liabilities are measured at amortized cost, unless they are required to be measured at FVTPL (such as debt) or the Company has opted to measure them at FVTPL. Financial assets and liabilities carried at FVTPL are initially recorded at fair value and transaction costs are expensed in profit or loss. Realized and unrealized gains and losses arising from changes in the fair value of the financial assets and liabilities held at FVTPL are included in the consolidated statements of operations in the period in which they arise.

Revenue Recognition and Accounts Receivables

Our revenues are primarily derived from the sale of uranium concentrates under contracts with major U.S. utilities. Revenue is recognized when delivery is evidenced by book transfer at the applicable uranium storage facility. The sales contracts specify the quantity to be delivered, the price, payment terms and the year of the delivery. Under these contracts, each product delivered to the customer represents a separate performance obligation. The Company's contracts with its customers include minimum quantities to be delivered over terms greater than one year and may include fixed prices, market-based prices, and other variable pricing. In many contracts the variable consideration is allocated entirely to a wholly unsatisfied performance obligation, having met the criteria to do so. Other contracts may require certain variable consideration to be estimated and constrained as part of the transaction price.

Under the Company’s uranium contracts, it invoices customers after the performance obligations have been satisfied, at which point payment is unconditional. Accordingly, the Company’s uranium contracts generally do not give rise to contract assets or liabilities.

The Company applies the optional exemption not to disclose the remaining transaction price that is variable and allocated to wholly unsatisfied future quantities. The Company expects to recognize revenue related to fixed and unconstrained variable consideration of $117,895 through December 31, 2028, and $205,620 thereafter under the non-cancelable portion of these contracts.

Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The Company evaluates its estimate of expected credit losses based on historical experience and current and forecasted future economic conditions for each portfolio of customers.

Concentrations of Credit Risk and Major Customers

The Company’s revenues are concentrated among a limited number of customers. For the year ended December 31, 2025, three customers accounted for approximately 63%, 25%, and 11% of total revenues. No other customer exceeded more than 10% of total revenues. For the year ended December 31, 2024, one customer accounted for approximately 77% of total revenues, and another customer accounted for approximately 23% of total revenues. No other customer exceeded more than 10% of the Company’s total revenue during the years ended December 31, 2025 and 2024.

As of December 31, 2025, one customer represented 100% of total trade accounts receivable. As of December 31, 2024, the Company did not have trade accounts receivable outstanding. The Company does not generally require collateral from its customers.

Geographic Concentrations

Substantially all of the Company’s revenues for the years ended December 31, 2025 and 2024 were derived from customers in the United States. As of December 31, 2025, substantially all trade accounts receivable were due from customers in the United States. The Company did not have significant revenues or receivables from customers outside the United States during the years ended December 31, 2025 and 2024

Loss per Share

Basic earnings or loss per share includes no potential dilution and is computed by dividing the earnings or loss attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings or loss per share reflects the potential dilution of securities that could share in the earnings or loss of our Company. Securities are excluded from the calculation of our diluted weighted average common shares outstanding if their effect would be anti-dilutive based on the treasury stock method or due to a net loss from continuing operations. Potential dilutive securities include stock options, restricted stock units, warrants and the Convertible Senior Notes (as defined below), which are excluded from the calculation of our diluted weighted average common shares outstanding as their effect would be anti-dilutive due to a net loss from continuing operations for the years ended December 31, 2025 and 2024. The Capped Calls Transactions (as defined below) are excluded from the loss per share diluted calculation because under U.S. GAAP purchased puts and calls are ignored in both basic and diluted loss per share.

Non-controlling Interests

Non-controlling interests are measured at their proportionate share of the acquiree’s identifiable net assets at the acquisition date and are adjusted at each reporting date for the net income (loss) attributable to that non-controlling interest during that period. The difference between the cash received and the proportionate share of the acquiree’s identifiable net assets is attributed to additional paid-in-capital.

Recently Adopted and Issued Accounting Standards

Recently Adopted Accounting Standards

In March 2024, the FASB issued ASU 2023-09, Income Taxes (Topic 740)-Improvements to Income Tax Disclosures. The ASU requires additional quantitative and qualitative income tax disclosures to allow readers of the consolidated financial statements to assess how the Company’s operations, related tax risks and tax planning affect its tax rate and prospects for future cash flows. For public business entities, the ASU was effective for annual periods beginning after December 15, 2024. The Company adopted this effective January 1, 2025. Adoption impacted disclosures but were not material to the Company's consolidated financial statements.

Recently Issued Accounting Standards

In November 2024, the FASB issued ASU 2024‑03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220‑40): Disaggregation of Income Statement Expenses. This ASU requires public business entities to disclose, in the notes to the financial statements, disaggregated information about certain expense categories included within income statement captions, without changing the presentation of the income statement. The guidance is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting this ASU on its consolidated financial statements and related disclosures.

In July 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2025‑05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. This ASU provides a practical expedient that permits entities to assume that current conditions as of the balance sheet date will remain unchanged for the remaining life of current accounts receivable and current contract assets arising from transactions accounted for under Topic 606. The guidance is effective for annual reporting periods beginning after December 15, 2025, including interim reporting periods within those annual periods. The Company did not elect to use the practical expedient as of December 31, 2025.

Fair Value

Fair value accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).

The three levels of the fair value hierarchy are described below:

•Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical unrestricted assets or liabilities;

•Level 2 - Quoted prices in markets that are not active, quoted prices for similar assets or liabilities in active markets, quoted prices or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability, and model-based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

•Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity).

The financial instruments, including cash and cash equivalents, accounts and other receivables, restricted cash, accounts payable and accrued liabilities, are carried at cost, which approximates their fair values due to the immediate or short-term maturity.

The Company’s investments in equity securities are publicly traded stocks measured at fair value and classified within Level 1 in the fair value hierarchy. Level 1 equity securities use quoted prices for identical assets in active markets.

The Company’s investments include certain investments accounted for at fair value consisting of warrants that are valued using the Black-Scholes option model based on observable inputs and as such are classified within Level 2 of the hierarchy. The warrant asset is included in marketable securities, long-term on the consolidated balance sheets.

The Company’s Convertible Senior Notes due 2030 (the “Convertible Senior Notes”) debt component was fair valued utilizing a 6.6% discount rate, which is the Company’s estimate of the market discount rate for this arrangement. This is classified within Level 2 of the hierarchy.