X0508 4 2024-09-18 0002005951 Smurfit Westrock plc SW 0001613133 FergusonMchugh MaryLynn ONE PROCTER & GAMBLE PLAZA CINCINNATI OH 45202 1 0 0 0 0 Ordinary Shares 2024-09-18 4 A 0 13 0 A 2107 D In accordance with the terms of outstanding time-based restricted stock units, 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 2,107 restricted stock units vest on January 1, 2025. Vested restricted stock units are expected to be settled in early 2025. Exhibit 24.1 Power of Attorney /s/ Ciara O'Riordan, attorney-in-fact-for Mary Lynn Ferguson-McHugh 2024-09-20