X0508 4 2025-02-19 0002005951 Smurfit Westrock plc SW 0001133264 SMURFIT ANTHONY P J BEECH HILL CLONSKEAGH DUBLIN L2 D04 N2R2 IRELAND 1 1 0 0 See Remarks 0 Ordinary Shares 2025-02-19 4 S 0 78000 55.04 D 1504545 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $55.01 to $55.05, inclusive. The reporting person undertakes to provide to Smurfit Westrock plc (the Company), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4. President and Group Chief Executive Officer /s/ Ciara O'Riordan, attorney-in-fact for Anthony Smurfit 2025-02-20