X0508 4 2025-06-18 0002005951 Smurfit Westrock plc SW 0001613133 FergusonMchugh MaryLynn BEECH HILL CLONSKEAGH DUBLIN 4 L2 D04N2R2 IRELAND 1 0 0 0 0 Ordinary Shares 2025-06-18 4 A 0 43 0 A 6090 D In accordance with the terms of outstanding restricted stock units, 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. The 4,282 restricted stock units are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders. /s/ Ciara O'Riordan, attorney-in-fact-for Mary Lynn Ferguson-McHugh 2025-06-23