X0508 4 2024-09-18 0002005951 Smurfit Westrock plc SW 0001133264 SMURFIT ANTHONY P J 0 1 0 0 President and Group CEO 0 Restricted Stock Units (PSP) 2024-09-18 4 A 0 1591 0 A Ordinary Shares 1591 253660 D In accordance with the terms of the restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.3025 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 253,660 restricted stock units vest and are settled as follows: (i) 78,467 restricted stock units in February 2025, (ii) 95,945 restricted stock units in February 2026, (iii) and 79,248 restricted stock units in February 2027. Exhibit 24.1 Power of Attorney /s/ Ciara O'Riordan, attorney-in-fact for Anthony P J Smurfit 2024-09-20