Transaction in Own Shares

14 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 07 September to 11 September 2026

Date

Venue

Weighted averageprice paid pershare (GBp)

Aggregate numberof shares

Lowest pricepaid pershare (GBp)

Highest pricepaid pershare (GBp)

07/09/26

London Stock Exchange

176.9417

43,322

176.6000

177.4000

Turquoise Exchange

177.0000

4,212

176.6000

177.4000

Chi-X Europe

176.9176

8,874

176.6000

177.4000

Bats Trading Europe

176.9134

12,975

176.2000

177.4000

08/09/26

London Stock Exchange

176.5957

36,769

175.8000

177.2000

Turquoise Exchange

176.6666

4,284

175.8000

177.2000

Chi-X Europe

176.6048

14,446

175.8000

177.2000

Bats Trading Europe

176.6068

13,717

175.8000

177.2000

09/09/26

London Stock Exchange

177.5763

39,470

175.4000

178.8000

Turquoise Exchange

177.8000

4,158

176.4000

178.6000

Chi-X Europe

177.7277

9,468

175.4000

178.8000

Bats Trading Europe

177.1721

24,102

175.2000

178.8000

10/09/26

London Stock Exchange

173.6311

32,954

172.6000

175.6000

Turquoise Exchange

173.7187

4,365

172.6000

175.6000

Chi-X Europe

173.6712

13,534

172.6000

175.6000

Bats Trading Europe

173.5113

17,124

172.6000

175.0000

11/09/26

London Stock Exchange

172.3810

40,661

171.4000

173.4000

Turquoise Exchange

172.4666

4,131

171.2000

173.4000

Chi-X Europe

172.3950

11,000

171.8000

173.4000

Bats Trading Europe

172.3378

21,475

171.4000

173.4000

Following settlement of the above purchases, the Company will hold 2,295,082 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 566,208,003. 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/6939U_1-2026-9-14.pdf

For further details:

Elementis plc

Contact

Title

Telephone

Hannah Constantine

Chief Legal and People Officer

+44 20 8148 5966