15 October 2025

Elementis plc

("Elementis" or the "Company")

Transaction in Own Shares

Elementis announces that, in accordance with the terms of its share buyback programme announced on 28 May 2025 (the "Share Buyback Programme"), the Company purchased the following number of its own ordinary shares of 5p each through Numis Securities Limited ("Deutsche Numis") for cancellation at an average price of 164.2103 pence per share:

Following settlement of the above purchases and cancellation of the purchased ordinary shares, the Company's total number of ordinary shares in issue shall be 574,873,375. The Company holds 286,469 ordinary shares in treasury and therefore the total number of voting rights in the Company will be 574,873,375. This figure for the total number of voting rights may be used by shareholders as the 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, the Company under the FCA's Disclosure Guidance and Transparency Rules.

Aggregate information:

Transaction Details:

In accordance with Article 5(1)(b) of the Market Abuse Regulation (EU) No. 596/2014 as it forms part of UK law, the table below contains detailed information of the individual trades made by Deutsche Numis on behalf of the Company as part of the Share Buyback Programme:

For further details:

Elementis plc

Hannah Constantine, Group General Counsel & Company Secretary         Tel: +44 20 8148 5966

Zeeshan Maqbool, Head of Investor Relations                                             Tel: +44 7553 340 380