X0508 4 2025-06-18 0002005951 Smurfit Westrock plc SW 0002026939 Bowles Ken BEECH HILL CLONSKEAGH DUBLIN 4 L2 D04 N2R2 IRELAND 1 1 0 0 Executive VP and Group CFO 0 Ordinary Shares 2025-06-18 4 A 0 189 0 A 130299 D Restricted Stock Units (PSP) 2025-06-18 4 A 0 909 0 A Ordinary Shares 909 90487 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 18,841 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 90,487 restricted stock units vest and are settled as follows:(i) 49,556 restricted stock units in February 2026, (ii) and 40,931 restricted stock units in February 2027. /s/ Ciara O'Riordan, attorney-in-fact for Ken Bowles 2025-06-23