Smurfit Westrock plc

('Smurfit Westrock')

TOTAL VOTING RIGHTS

DUBLIN (August 01, 2025)

In accordance with DTR 5.6.1 of the UK's Financial Conduct Authority's Disclosure Guidance and Transparency Rules, Smurfit Westrock announces that:

As of 31 July 2025, Smurfit Westrock's issued share capital consists of 522,125,044 Ordinary Shares of nominal value $0.001 each.  Smurfit Westrock does not hold any Ordinary Shares in treasury. Therefore, the total number of voting rights in Smurfit Westrock is 522,125,044.

The above figure may be used by shareholders as a denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Smurfit Westrock under the UK's Financial Conduct Authority's Disclosure Guidance and Transparency Rules.

August 01, 2025

CONTACT:

Gillian Carson-Callan

Group SVP Finance & Company Secretary

+353 (0)1 202 7000