Alkermes plc. New Standards Disclosure

New Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB or other standard-setting bodies that are adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (“Topic 740”): Improvements to Income Tax Disclosures, to enhance the transparency and decision usefulness of income tax disclosures in order to provide information to assist key stakeholders in better assessing how the Company’s operations and related tax risks and tax planning and operational opportunities affect the Company’s tax rate and prospects for future cash flows. This ASU became effective for public companies for annual periods beginning after December 15, 2024. This guidance was applied on a retrospective basis. See Note 17, Income Taxes in these “Notes to Consolidated Financial Statements” in this Annual Report for additional information.

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income-Expense Disaggregation Disclosures, to improve disclosures about a public business entity’s expenses and address requests from investors for more detailed information about the types of expenses (including purchases of inventory, employee compensation, depreciation, amortization and depletion) in commonly-presented expense captions, such as cost of sales, selling, general and administrative expenses, and research and development. All disclosure requirements under this guidance are required for public business entities and effective for annual periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027. Early adoption is permitted and the amendments in this guidance will be applied prospectively to financial statements for periods after the effective dates. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements and related disclosures.

In September 2025, the FASB issued ASU 2025-06, Targeted Improvements to the Accounting for Internal-Use Software. This ASU updates the requirements for capitalization of internal-use software, removing all reference to prescriptive and sequential software development stages (referred to as “project stages”). This ASU is effective for annual periods beginning after December 15, 2027, and for interim periods within those fiscal years. The Company is currently assessing the impact this ASU will have on its consolidated financial statements and related disclosures.

In December 2025, the FASB issued ASU 2025-11, Interim Reporting. The amendments in this update clarify current interim disclosure requirements and provide a comprehensive list of required interim disclosures. The update also incorporates a disclosure principle that requires entities to disclose events that occur after the end of the reporting period. This update is effective for interim periods within annual periods beginning after December 15, 2027, though early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements and related disclosures.