Commencement of Share Buyback

Further to the announcement of 27 May 2025, Elementis plc ("Elementis" or the "Company"), announces that from today it will commence a programme to purchase up to approximately £40 million ($50 million equivalent) of the Company's ordinary shares of 5 pence each (the "Ordinary Shares") (the "Programme") by no later than 28 April 2026.

The purpose of the Programme is to reduce the Company's share capital and accordingly the Company intends to cancel the majority of shares repurchased, with a small proportion retained in treasury to meet obligations under the Company's employee share scheme. Any purchases will be conducted in compliance with the relevant conditions for trading, restrictions regarding time and volume, disclosure and reporting obligations, and price conditions. The Company confirms that it currently has no unpublished Inside Information.

The Programme will be conducted by the Company in accordance with and under the terms of the general authority granted by the Company's shareholders at the Company's Annual General Meeting on 29th April 2025 which authority will expire at the end of the next Annual General Meeting of the Company in 2026 or, if earlier, 1 July 2026 ("2025 Authority"). The Company has appointed its broker Numis Securities Limited ("Deutsche Numis") to manage the Programme and has issued an irrevocable instruction to Deutsche Numis to continue to manage the Programme, within pre-set parameters, during any closed period. This appointment will continue until 28 April 2026 (unless terminated earlier in accordance with its terms), subject to automatic extension in certain circumstances. The Programme will be carried out on the London Stock Exchange and other trading venues1 and executed within the parameters of the Market Abuse Regulation 596/2014/EU and the Commission Delegated Regulation 2016/1052/EU (as each forms part of domestic law under the European Union (Withdrawal) Act 2018, including where relevant pursuant to the Market Abuse (Amendment) (EU Exit) Regulations 2019) and Chapter 9 of the UK Listing Rules of the Financial Conduct Authority.

The aggregate maximum consideration payable by the Company in respect of the purchase of shares under the Programme up to 28 April 2026 is up to approximately £40 million ($50 million equivalent). The maximum number of shares that may be purchased under the Programme is 59,096,558 (being the number of shares able to be purchased under the 2025 Authority).

1 Turquoise, Chi-X Europe and BATS Trading Europe.