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: SMURFIT ANTHONY P J CIK: 0001133264 Role: Director, Officer (President and CEO) --- Non-Derivative Transactions --- [Transaction #1] Security: Ordinary Shares Date: 2026-09-10 | Code: A (Grant or award) Shares: +486 | Price: $0.00 Shares Owned After: 1,728,994 | 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 132,144 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: +910 | Price: $0.00 Exercise Price: $0.00 Shares Owned After: 85,854 | 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. [F4] The 85,854 restricted stock units vest and are due to settle in February 2027. [F4] The 85,854 restricted stock units vest and are due to settle in February 2027. --- Holdings --- [Holding #1] Security: Ordinary Shares Ownership: I (Indirect) Footnotes: [F3] These shares are held by the Reporting Person's child who is part of the Reporting Person's household. The Reporting Person disclaims ownership of the shares held by this child, and this report is not an admission that the Reporting Person is the beneficial owner of these shares for the purposes of Section 16 or for any other purposes. --- 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 132,144 restricted stock units which are scheduled to vest in three equal annual installments beginning on the first anniversary of the grant date. F3: These shares are held by the Reporting Person's child who is part of the Reporting Person's household. The Reporting Person disclaims ownership of the shares held by this child, and this report is not an admission that the Reporting Person is the beneficial owner of these shares for the purposes of Section 16 or for any other purposes. F4: The 85,854 restricted stock units vest and are due to settle in February 2027. --- Signature --- /s/ /s/ Ciara O'Riordan (attorney-in-fact for Anthony Smurfit) (2026-09-14)