Smurfit Westrock (SW)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-10 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Smurfit Westrock plc (SW) CIK: 0002005951 --- Reporting Owner --- Name: Page Irene CIK: 0002029262 Role: Officer (Chief Accounting Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Ordinary Shares Date: 2026-09-10 | Code: A (Grant or award) Shares: +23 | Price: $0.00 Shares Owned After: 62,787 | Ownership: D (Direct) Footnotes: [F1] 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 $0.4523 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. [F2] Includes 5,469 restricted stock units which are scheduled to vest in three equal annual installments beginning on the first anniversary of the grant date. --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Units (PSP) Date: 2026-09-10 | Code: A (Grant or award) Shares: +152 | Price: $0.00 Exercise Price: $0.00 Shares Owned After: 14,361 | Ownership: D (Direct) Footnotes: [F1] 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 $0.4523 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. [F3] The 14,361 restricted stock units vest and are due to settle in February 2027. [F3] The 14,361 restricted stock units vest and are due to settle in February 2027. --- Footnotes (Complete Index) --- F1: 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 $0.4523 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. F2: Includes 5,469 restricted stock units which are scheduled to vest in three equal annual installments beginning on the first anniversary of the grant date. F3: The 14,361 restricted stock units vest and are due to settle in February 2027. --- Signature --- /s/ /s/ Ciara O'Riordan, attorney-in-fact for Irene Page (2026-09-14)