Basis of Financial Statement Presentation (Policies)	9 Months Ended
Mar. 31, 2026
Policy Text Block [Abstract]
Basis of Presentation	These unaudited condensed consolidated financial statements (herein after referred to as “financial statements”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and should be read in the context of the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2025, filed with the U.S. Securities and Exchange Commission on September 29, 2025. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position as of March 31, 2026, results of operations for the three and nine months ended March 31, 2026 and 2025 and cash flows for the nine months ended March 31, 2026 and 2025 have been included. Operating results for the three and nine months ended March 31, 2026 are not necessarily indicative of the results that may be expected for the full fiscal year ending June 30, 2026.
Basis of Consolidation	Basis of Consolidation The unaudited condensed consolidated financial statements comprise the financial statements of 5E Advanced Materials, Inc. and its wholly owned subsidiaries, American Pacific Borates Pty Ltd. and 5E Boron Americas, LLC (formerly Fort Cady (California) Corporation, (“5EBA”)), (collectively, the “Company”). The Company holds 100% of the rights through ownership and lode claims filed with the United States Bureau of Land Management in the 5E Boron Americas (Fort Cady) Complex (the “Project”) located in southern California, through its ownership of 5EBA. In preparing the condensed consolidated financial statements, all intercompany balances and transactions, income and expenses and profit and losses resulting from intra-company transactions have been eliminated.
Reverse Stock Split	Reverse Stock Split On February 14, 2025 (the “Effective Time”), the Company completed a 1-for-23 reverse stock split (the “Reverse Stock Split”). As a result of the Reverse Stock Split, at the Effective Time, every 23 shares of the Company's issued and outstanding shares of common stock, par value $0.01 (“Common Stock”) immediately prior to the Effective Time, were automatically converted into one validly issued, fully-paid and non-assessable share of Common Stock. These notes to the unaudited condensed consolidated financial statements and the accompanying unaudited condensed consolidated financial statements give retroactive effect to the Reverse Stock Split for all periods presented.
Debt Exchange	Debt Exchange During March 2025, the Company completed a debt restructuring transaction with BEP Special Situations IV LLC (“Bluescape”), Meridian Investments Corporation (“Meridian”) and Ascend Global Investment Fund SPC (“Ascend”), for and on behalf of Strategic SP (together with Meridian, “Ascend”) in connection with certain restructuring and recapitalization transactions with respect to the Company’s capital structure (collectively the “Exchange Transaction”), including the Company’s Convertible Notes (as defined in Note 7-Debt) issued pursuant to the Amended and Restated Note Purchase Agreement (as defined in Note 7-Debt). The Exchange Transaction resulted in: • the issuance of an aggregate of 13,586,524 shares of the Company’s common stock, par value $0.01 per share (“Common Stock”) on March 5, 2025, to Ascend and Bluescape upon exchange of all of the outstanding Convertible Notes (as defined in Note 7-Debt) and the extinguishment of all indebtedness owed by the Company under the Amended and Restated Note Purchase Agreement (as defined in Note 7-Debt) (the “Exchange”); • the issuance and sale by the Company of 1,408,173 shares of Common Stock to Ascend and Bluescape on March 14, 2025, at a price per share of $3.5507 (the “Subscription Price”) for aggregate net proceeds of approximately $4.9 million; • the issuance by the Company to Ascend and Bluescape of warrants on March 13, 2025 that expire March 13, 2026 to purchase up to 5,632,692 shares of Common Stock, at a price per share equal to the Subscription Price (the “Restructuring Warrants”); and • the right of each of Ascend and Bluescape to designate two directors to serve on the Company’s Board of Directors (“Board”) for so long as such party beneficially owns 25% of the Company’s Common Stock and one director to serve on the Company's Board for so long as such party beneficially owns 10% of the Company's Common Stock.
Going Concern	Going Concern Management evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company's ability to continue as a going concern for one year after the date that these condensed consolidated financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company's ability to continue as a going concern. The mitigating effect of management's plans, however, is only considered if both (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued, and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern for one year after the date that the condensed consolidated financial statements are issued. In performing this analysis, management concluded there continues to exist substantial doubt regarding the Company’s ability to continue as a going concern. As a pre-revenue development stage company, the Company is dependent on debt and equity financing transactions to fund its continued development and operational activities. While the Company has continued to execute a number of financing transactions, as described in this footnote and Note 10-Equity, each of which have improved the Company’s cash position, and while the Company continues to operate under a business plan that includes reductions in certain spending, management anticipates the need for additional financing to maintain its operations and carry out its business objectives. The receipt of potential funding cannot be considered probable at this time because these plans are not entirely within management's control as of the date of these condensed consolidated financial statements. Therefore, there exists substantial doubt regarding the Company's ability to continue as a going concern. Even if additional financing is successfully consummated, available liquidity may still not be sufficient to eliminate the aforementioned substantial doubt regarding the Company's ability to continue as a going concern. If the Company is unable to raise additional capital or generate cash flows necessary to fund its operations and business objectives, the Company will need to curtail planned activities, discontinue certain operations, or sell certain assets, which could materially and adversely affect its business, financial condition, results of operations, and prospects. These financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the ordinary course of business and do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of the uncertainties described above.
Financial Instruments	Financial Instruments The Company's financial instruments consist of cash and cash equivalents, reclamation bond deposits, vehicle notes, accounts payable and accrued liabilities. Management believes the Company is not exposed to significant interest, currency or credit risks arising from these financial instruments. The fair values of these instruments, due to their short-term nature, approximate their carrying value.
Concentrations of Risk	Concentrations of Risk The Company maintains cash deposits at several major banks, which at times may exceed amounts covered by insurance provided by the United States Federal Deposit Insurance Corporation. Management monitors the financial health of the banks and believes the Company is not exposed to any significant credit risk, and the Company has not experienced any such losses. The Company’s operations are predominately focused on the Project, which results in the Company being dependent upon a single mining operation in a single geographic region in the western United States in California. The geographic concentration of the Company’s operations may disproportionately expose it to disruptions if the region experiences severe weather, transportation capacity constraints, constraints on the availability of required equipment, facilities, personnel or services, significant governmental regulation or natural disasters.
Risk and Uncertainties	Risks and Uncertainties The Company is subject to a number of risks that its management believes are similar to those of other companies of similar size and industry, including but not limited to, the success of its exploration activities, need for significant additional capital (or financing) to fund operating losses, competition from substitute products and services from larger companies, protection of proprietary technology, patent litigation, tariff and trade policy impacts on operating and construction costs, and dependence on key individuals. The Company currently generates no revenue from operations and will need to rely on raising additional capital or financing to sustain current and planned operations in the long term. There can be no assurance that management will be successful in its efforts to raise additional capital on terms favorable to the Company, or at all, or in management's ability to adequately reduce expenses, if necessary, to maintain sufficient liquidity or capital resources. Refer to the Going Concern discussion above for additional details.
Segment Information	Segment Information The Company has evaluated how it is organized and managed and has identified only one reportable business segment, which is the development of the Project. There has been no change in the determination of the Company’s segment information in the current reporting period. All of the Company’s operations and assets are located in the United States. The operating results of the Company’s single reportable segment are evaluated by the Company’s Chief Executive Officer, who has been determined to be the Company’s Chief Operating Decision Maker (“CODM”), to make key operating decisions, such as the allocation of resources and the evaluation of operating segment performance. The primary measure of profit and loss evaluated by the Company’s CODM for its single reportable segment is consolidated net income. Consolidated net income, total assets, cash flows and all significant segment expense items are presented in the Company’s unaudited condensed consolidated financial statements and notes to the unaudited condensed consolidated financial statements.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) that are adopted by the Company as of the specified effective date. Unless otherwise discussed, management believes that the impact of recently issued standards did not or will not have a material impact on the Company’s consolidated financial statements upon adoption. In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 is intended to improve income tax disclosures primarily through enhanced disclosure of income tax rate reconciliation items, and disaggregation of income (loss) from continuing operations, income tax expense (benefit) and income taxes paid, net disclosures by federal, state, and foreign jurisdictions, among others. ASU 2023-09 is effective for annual reporting periods beginning after December 15, 2024, and early adoption is permitted. The Company plans to adopt ASU 2023-09 effective for its fiscal year ending June 30, 2026. 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 (“ASU 2024-03”), which requires the disaggregation of certain expenses in the notes of the financial statements, to provide enhanced transparency into the expense captions presented on the face of the income statement. In January 2025, the FASB issued Income Statement–Reporting Comprehensive Income–Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which clarified the effective dates of ASU 2024-03. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact that ASU 2024-03 will have on its related disclosures, including the adoption date and transition method.

Basis of Financial Statement Presentation (Policies)

9 Months Ended

Mar. 31, 2026

These unaudited condensed consolidated financial statements (herein after referred to as “financial statements”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and should be read in the context of the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2025, filed with the U.S. Securities and Exchange Commission on September 29, 2025. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position as of March 31, 2026, results of operations for the three and nine months ended March 31, 2026 and 2025 and cash flows for the nine months ended March 31, 2026 and 2025 have been included. Operating results for the three and nine months ended March 31, 2026 are not necessarily indicative of the results that may be expected for the full fiscal year ending June 30, 2026.

Basis of Consolidation

The unaudited condensed consolidated financial statements comprise the financial statements of 5E Advanced Materials, Inc. and its wholly owned subsidiaries, American Pacific Borates Pty Ltd. and 5E Boron Americas, LLC (formerly Fort Cady (California) Corporation, (“5EBA”)), (collectively, the “Company”). The Company holds 100% of the rights through ownership and lode claims filed with the United States Bureau of Land Management in the 5E Boron Americas (Fort Cady) Complex (the “Project”) located in southern California, through its ownership of 5EBA. In preparing the condensed consolidated financial statements, all intercompany balances and transactions, income and expenses and profit and losses resulting from intra-company transactions have been eliminated.

Reverse Stock Split

On February 14, 2025 (the “Effective Time”), the Company completed a 1-for-23 reverse stock split (the “Reverse Stock Split”). As a result of the Reverse Stock Split, at the Effective Time, every 23 shares of the Company's issued and outstanding shares of common stock, par value $0.01 (“Common Stock”) immediately prior to the Effective Time, were automatically converted into one validly issued, fully-paid and non-assessable share of Common Stock. These notes to the unaudited condensed consolidated financial statements and the accompanying unaudited condensed consolidated financial statements give retroactive effect to the Reverse Stock Split for all periods presented.

Debt Exchange

During March 2025, the Company completed a debt restructuring transaction with BEP Special Situations IV LLC (“Bluescape”), Meridian Investments Corporation (“Meridian”) and Ascend Global Investment Fund SPC (“Ascend”), for and on behalf of Strategic SP (together with Meridian, “Ascend”) in connection with certain restructuring and recapitalization transactions with respect to the Company’s capital structure (collectively the “Exchange Transaction”), including the Company’s Convertible Notes (as defined in Note 7-Debt) issued pursuant to the Amended and Restated Note Purchase Agreement (as defined in Note 7-Debt). The Exchange Transaction resulted in:

•

the issuance of an aggregate of 13,586,524 shares of the Company’s common stock, par value $0.01 per share (“Common Stock”) on March 5, 2025, to Ascend and Bluescape upon exchange of all of the outstanding Convertible Notes (as defined in Note 7-Debt) and the extinguishment of all indebtedness owed by the Company under the Amended and Restated Note Purchase Agreement (as defined in Note 7-Debt) (the “Exchange”);

•

the issuance and sale by the Company of 1,408,173 shares of Common Stock to Ascend and Bluescape on March 14, 2025, at a price per share of $3.5507 (the “Subscription Price”) for aggregate net proceeds of approximately $4.9 million;

•

the issuance by the Company to Ascend and Bluescape of warrants on March 13, 2025 that expire March 13, 2026 to purchase up to 5,632,692 shares of Common Stock, at a price per share equal to the Subscription Price (the “Restructuring Warrants”); and

•

the right of each of Ascend and Bluescape to designate two directors to serve on the Company’s Board of Directors (“Board”) for so long as such party beneficially owns 25% of the Company’s Common Stock and one director to serve on the Company's Board for so long as such party beneficially owns 10% of the Company's Common Stock.

Going Concern

Management evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company's ability to continue as a going concern for one year after the date that these condensed consolidated financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company's ability to continue as a going concern. The mitigating effect of management's plans, however, is only considered if both (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued, and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern for one year after the date that the condensed consolidated financial statements are issued. In performing this analysis, management concluded there continues to exist substantial doubt regarding the Company’s ability to continue as a going concern.

As a pre-revenue development stage company, the Company is dependent on debt and equity financing transactions to fund its continued development and operational activities. While the Company has continued to execute a number of financing transactions, as described in this footnote and Note 10-Equity, each of which have improved the Company’s cash position, and while the Company continues to operate under a business plan that includes reductions in certain spending, management anticipates the need for additional financing to maintain its operations and carry out its business objectives. The receipt of potential funding cannot be considered probable at this time because these plans are not entirely within management's control as of the date of these condensed consolidated financial statements. Therefore, there exists substantial doubt regarding the Company's ability to continue as a going concern. Even if additional financing is successfully consummated, available liquidity may still not be sufficient to eliminate the aforementioned substantial doubt regarding the Company's ability to continue as a going concern. If the Company is unable to raise additional capital or generate cash flows necessary to fund its operations and business objectives, the Company will need to curtail planned activities, discontinue certain operations, or sell certain assets, which could materially and adversely affect its business, financial condition, results of operations, and prospects.

These financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the ordinary course of business and do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of the uncertainties described above.

Financial Instruments

The Company's financial instruments consist of cash and cash equivalents, reclamation bond deposits, vehicle notes, accounts payable and accrued liabilities. Management believes the Company is not exposed to significant interest, currency or credit risks arising from these financial instruments. The fair values of these instruments, due to their short-term nature, approximate their carrying value.

Concentrations of Risk

The Company maintains cash deposits at several major banks, which at times may exceed amounts covered by insurance provided by the United States Federal Deposit Insurance Corporation. Management monitors the financial health of the banks and believes the Company is not exposed to any significant credit risk, and the Company has not experienced any such losses.

The Company’s operations are predominately focused on the Project, which results in the Company being dependent upon a single mining operation in a single geographic region in the western United States in California. The geographic concentration of the Company’s operations may disproportionately expose it to disruptions if the region experiences severe weather, transportation capacity constraints, constraints on the availability of required equipment, facilities, personnel or services, significant governmental regulation or natural disasters.

Risk and Uncertainties

Risks and Uncertainties

The Company is subject to a number of risks that its management believes are similar to those of other companies of similar size and industry, including but not limited to, the success of its exploration activities, need for significant additional capital (or financing) to fund operating losses, competition from substitute products and services from larger companies, protection of proprietary technology, patent litigation, tariff and trade policy impacts on operating and construction costs, and dependence on key individuals. The Company currently generates no revenue from operations and will need to rely on raising additional capital or financing to sustain current and planned operations in the long term. There can be no assurance that management will be successful in its efforts to raise

additional capital on terms favorable to the Company, or at all, or in management's ability to adequately reduce expenses, if necessary, to maintain sufficient liquidity or capital resources. Refer to the Going Concern discussion above for additional details.

Segment Information

The Company has evaluated how it is organized and managed and has identified only one reportable business segment, which is the development of the Project. There has been no change in the determination of the Company’s segment information in the current reporting period. All of the Company’s operations and assets are located in the United States. The operating results of the Company’s single reportable segment are evaluated by the Company’s Chief Executive Officer, who has been determined to be the Company’s Chief Operating Decision Maker (“CODM”), to make key operating decisions, such as the allocation of resources and the evaluation of operating segment performance. The primary measure of profit and loss evaluated by the Company’s CODM for its single reportable segment is consolidated net income. Consolidated net income, total assets, cash flows and all significant segment expense items are presented in the Company’s unaudited condensed consolidated financial statements and notes to the unaudited condensed consolidated financial statements.

Recently Issued and Adopted Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) that are adopted by the Company as of the specified effective date. Unless otherwise discussed, management believes that the impact of recently issued standards did not or will not have a material impact on the Company’s consolidated financial statements upon adoption.

In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 is intended to improve income tax disclosures primarily through enhanced disclosure of income tax rate reconciliation items, and disaggregation of income (loss) from continuing operations, income tax expense (benefit) and income taxes paid, net disclosures by federal, state, and foreign jurisdictions, among others. ASU 2023-09 is effective for annual reporting periods beginning after December 15, 2024, and early adoption is permitted. The Company plans to adopt ASU 2023-09 effective for its fiscal year ending June 30, 2026.

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 (“ASU 2024-03”), which requires the disaggregation of certain expenses in the notes of the financial statements, to provide enhanced transparency into the expense captions presented on the face of the income statement. In January 2025, the FASB issued Income Statement–Reporting Comprehensive Income–Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which clarified the effective dates of ASU 2024-03. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact that ASU 2024-03 will have on its related disclosures, including the adoption date and transition method.