Form 10-K

Smurfit Westrock plc (the ‘Company’) 27 February 2026 2025 ANNUAL REPORT ON FORM 10-K The Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “2025 Annual Report”) has been published by the Company and was filed with the U.S. Securities and Exchange Commission (the “SEC”) today. The 2025 Annual Report is available to view on: the SEC’s website at: https://www.sec.gov; and the Company’s website at: https://investors.smurfitwestrock.com/financials/sec-filings/default.aspx Shareholders may request to receive a physical copy of the Company’s complete audited financial statements (as included in the 2025 Annual Report and prepared in accordance with U.S. generally accepted accounting principles, or U.S. GAAP) free of charge upon request to our Investor Relations team at Smurfit Westrock plc, Investor Relations, Beech Hill, Clonskeagh, Dublin 4, D04 N2R2, Ireland or via email [email protected]. The 2025 Annual Report is expected to be mailed to those shareholders who have requested a physical copy beginning on or about March 11, 2026. Contact Gillian Carson-Callan Group SVP Finance and Company Secretary T: +353 1 202 7000 Smurfit Westrock plc Source: Smurfit Westrock plc