Transaction in Own Shares

28 September 2026

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 3 June 2026 (the "Share Buyback Programme"), the Company purchased the following number of its own ordinary shares of 5p each (the "Ordinary Shares") through Rothschild & Co Global Markets Solutions Limited ("Rothschild & Co") in the period 21 September to 25 September 2026

Date

Venue

Weighted averageprice paid pershare (GBp)

Aggregate numberof shares

Lowest pricepaid pershare (GBp)

Highest pricepaid pershare (GBp)

21/09/26

London Stock Exchange

175.7739

44,108

171.6000

179.0000

Turquoise Exchange

175.7014

4,365

171.6000

179.0000

Chi-X Europe

175.7407

14,392

171.8000

179.0000

Bats Trading Europe

176.2760

14,151

172.0000

178.8000

22/09/26

London Stock Exchange

176.1915

41,950

173.8000

177.0000

Turquoise Exchange

176.2405

4,031

173.8000

176.8000

Chi-X Europe

176.0523

12,123

173.8000

176.8000

Bats Trading Europe

176.0056

12,366

174.0000

176.8000

23/09/26

London Stock Exchange

177.8114

47,856

176.6000

178.8000

Turquoise Exchange

177.6177

4,521

177.2000

178.4000

Chi-X Europe

177.3750

3,912

176.6000

178.0000

Bats Trading Europe

177.3111

4,275

176.6000

177.8000

24/09/26

London Stock Exchange

177.6711

40,000

176.4000

178.8000

Turquoise Exchange

177.6916

4,490

177.2000

177.8000

Chi-X Europe

177.2706

25,000

176.4000

178.6000

Bats Trading Europe

177.6023

15,000

176.6000

178.6000

25/09/26

London Stock Exchange

176.9028

35,646

175.8000

177.8000

Turquoise Exchange

176.7713

4,530

176.0000

177.4000

Chi-X Europe

176.9839

13,088

175.8000

177.6000

Bats Trading Europe

176.9493

18,012

175.4000

178.0000

Following settlement of the above purchases, the Company will hold 3,026,535 Ordinary Shares in treasury. The Company's total issued share capital comprises 568,503,085 Ordinary Shares (including those held in treasury). Accordingly, the total voting rights in the Company is 565,476,550. This figure for the total number of Ordinary Shares carrying voting rights in the Company 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.In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 (as incorporated into UK domestic law by the European Union (Withdrawal) Act 2018), a schedule of individual trades made by Rothschild & Co is available using the following:http://www.rns-pdf.londonstockexchange.com/rns/6263W_1-2026-9-28.pdf

For further details:

Elementis plc

Contact

Contact

Telephone

Hannah Constantine

Chief Legal and People Officer

+44 20 8148 5966