AMARIN CORP PLC\UK New Standards Disclosure

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board, or FASB, and are early adopted by the Company or adopted as of the specified effective date.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740)—Improvements to Income Tax Disclosures, which provides more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. This change is effective for annual periods beginning after December 15, 2024. The Company adopted this standard on a prospective basis effective January 1, 2025 and additional requirements are disclosed within the Company's consolidated financial statements.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) and subsequently ASU No. 2025-01 Income Statement — Reporting Comprehensive Income —Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which requires a public business entity to disclose specific information about certain costs and expenses in the notes to its financial statements for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027. The Company is currently evaluating the impact that the adoption of ASU 2024-03 will have on the Company’s consolidated financial statements.

In July 2025, the FASB issued ASU No. 2025-05, Financial Instruments–Credit Losses, which provides guidance on an optional practical expedient when applying the guidance related to the estimation of expected credit losses for current accounts receivable and current contract assets resulting from transactions arising from contracts with customers. The guidance is effective for annual reporting periods beginning after December 15, 2025 and interim reporting periods within that fiscal year. We are evaluating the impact of the standard on our financial statements.

In December 2025, the FASB issued new accounting guidance, ASU No. 2025-11, Interim Reporting (Topic 270): Narrow Scope Improvements, which clarifies the scope and requirements for interim financial statement disclosures. The amendment creates a comprehensive list of required interim disclosures and introduces a disclosure principle requiring entities to disclose, in interim periods, any event or change since the previous year-end that has a material effect on the entity. The guidance is effective for annual reporting periods beginning after December 15, 2027, and for interim periods within that fiscal year. We are currently evaluating the impact of adopting this guidance.

The Company believes that the impact of other recently issued but not yet adopted accounting pronouncements will not have a material impact on the Company’s consolidated financial position, results of operations, and cash flows, or do not apply to the Company’s operations.