X0508 4 2025-06-18 0002005951 Smurfit Westrock plc SW 0001133264 SMURFIT ANTHONY P J BEECH HILL CLONSKEAGH DUBLIN 4 L2 D04N2R2 IRELAND 1 1 0 0 President and Group CEO 0 Ordinary Shares 2025-06-18 4 A 0 656 0 A 1569767 D Restricted Stock Units (PSP) 2025-06-18 4 A 0 1807 0 A Ordinary Shares 1807 179706 D In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share. Includes 65,222 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date. The 179,706 restricted stock units vest and are settled as follows:(i) 98,417 restricted stock units in February 2026, (ii) and 81,289 restricted stock units in February 2027. /s/ Ciara O'Riordan, attorney-in-fact for Anthony P J Smurfit 2025-06-23