SW · Smurfit Westrock plc · Investor Relations

RNS Number : 1333Z Smurfit Westrock PLC 01 April 2026 Smurfit Westrock plc ('Smurfit Westrock') TOTAL VOTING RIGHTS DUBLIN (April 01, 2026) In accordance with DTR 5.6.1 of the UK's Financial Conduct Authority's Disclosure Guidance and Transparency Rules, Smurfit Westrock announces that: As of 31 March 2026, Smurfit Westrock's issued share capital consists of 524,457,866 Ordinary Shares of nominal value $0.001 each. Smurfit Westrock does not hold any Ordinary Shares in treasury. Therefore, the total number of voting rights in Smurfit Westrock is 524,457,866 . The above figure may be used by shareholders as a denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Smurfit Westrock under the UK's Financial Conduct Authority's Disclosure Guidance and Transparency Rules. April 01, 2026 CONTACT: Gillian Carson-Callan Group SVP

RNS Number : 8451Y Smurfit Westrock PLC 31 March 2026 TR-1: Standard form for notification of major holdings 1. Issuer Details ISIN IE00028FXN24 Issuer Name SMURFIT WESTROCK PUBLIC LIMITED COMPANY UK or Non-UK Issuer Non-UK 2. Reason for Notification An acquisition or disposal of voting rights 3. Details of person subject to the notification obligation Name The Capital Group Companies, Inc. City of registered office (if applicable) Los Angeles Country of registered office (if applicable) USA 4. Details of the shareholder Full name of shareholder(s) if different from the person(s) subject to the notification obligation, above City of registered office (if applicable) Country of registered office (if applicable) 5. Date on which the threshold was crossed or reached 27-Mar-2026 6. Date on which Issuer notified 30-Mar-2026 7. Total positions of person(s) subject to the notification obligation % of voting rights attached to shares (total of 8.A) % of voting

RNS Number : 5590X Smurfit Westrock PLC 20 March 2026 Notification of Transactions by Persons Discharging Managerial Responsibilities and persons closely associated with them 1 Details of the person discharging managerial responsibilities / person closely associated a) Name Anthony Smurfit 2 Reason for the notification a) Position/status President & Group Chief Executive Officer /Executive Director b) Initial notification /Amendment Initial Notification 3 Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor a) Name Smurfit Westrock plc b) LEI 635400EGSEOPDW2EXS14 4 Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been

RNS Number : 6519W Smurfit Westrock PLC 13 March 2026 Notification of Transactions by Persons Discharging Managerial Responsibilities and persons closely associated with them 1 Details of the person discharging managerial responsibilities / person closely associated a) Name Anthony Smurfit 2 Reason for the notification a) Position/status President & Group Chief Executive Officer /Executive Director b) Initial notification /Amendment Initial Notification 3 Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor a) Name Smurfit Westrock plc b) LEI 635400EGSEOPDW2EXS14 4 Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been

Smurfit Westrock plc (the ‘Company’) 11 March 2026 2026 Definitive Proxy Statement, Annual Report to Security Holders and Additional Definitive Proxy Soliciting Material Smurfit Westrock plc today filed the: 2026 Definitive Proxy Statement for the Company’s 2026 Annual General Meeting of Shareholders on Schedule 14A with the U.S. Securities and Exchange Commission (the “ SEC ”); Annual Report to Security Holders for the fiscal year ended December 31, 2025 on Form ARS with the SEC (the “ 2025 Annual Report ”); and Additional Definitive Proxy Soliciting Material. (together, the “ Proxy Materials ”). The Proxy Materials have been filed with the SEC in accordance with the U.S. Securities Exchange Act of 1934, as amended, and are available to view on: the SEC's website at: https://www.sec.gov ; and the Company's website at: https://investors.smurfitwestrock.com/general-meetings/agm The 2026 Definitive Proxy Statement and the 2025 Annual Report have also been submitted to the