Transaction in Own Shares.

4 June 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").

The Company will hold the repurchased shares in treasury. Following the purchase of these shares, the Company will hold 868,282 ordinary shares in treasury and the remaining number of ordinary shares in issue will be 591,541,489 (excluding treasury shares).

Therefore, the total voting rights in Elementis will be 591,541,489. 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

Lynton Boardman, Group General Counsel & Company Secretary            Tel: +44 20 8148 5966

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