TOTAL VOTING RIGHTS

DUBLIN (January 02, 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 December 2024, Smurfit Westrock's issued share capital consists of 520,444,261 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 520,444,261 .

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.

02 January 2025

CONTACT:

Gillian Carson-Callan

Group SVP Finance & Company Secretary

+353 (0)1 202 7000

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