Smurfit Westrock (SW)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-03-18 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Smurfit Westrock plc (SW) CIK: 0002005951 --- Reporting Owner --- Name: WILSON ALAN D CIK: 0001216704 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Ordinary Shares Date: 2026-03-18 | Code: A (Grant or award) Shares: +719.864 | Price: $0.00 Shares Owned After: 63,870.23 | 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 4,422 restricted stock units which will vest on the earlier of (i) May 2, 2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders and 57,721.230 fully vested restricted stock units that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of the Issuer's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors. --- 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 4,422 restricted stock units which will vest on the earlier of (i) May 2, 2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders and 57,721.230 fully vested restricted stock units that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of the Issuer's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors. --- Signature --- /s/ /s/ Ciara O'Riordan, attorney-in-fact-pursuant for Alan D. Wilson (2026-03-20)