Transaction in Own Shares

12 May 2026

Keller Group plc

("Keller" or the "Company")

Transaction in Own Shares

Keller Group plc ("Keller" or the "Company") announces today it has purchased the following number of its ordinary shares of 10 pence ("Ordinary Shares") each through Investec Bank plc ("Investec") in the period from 05 May 2026 to 08 May 2026 as part of its share buyback programme, details of which were announced by Keller on 30 March 2026.

Aggregate information:

The Company intends to hold the purchased Ordinary Shares in treasury. Following the purchase and settlement of these Ordinary Shares, the Company will hold 3,181,967 of its Ordinary Shares in treasury and will have 73,099,735 Ordinary Shares in issue (including treasury shares).

Schedule of Purchases - Individual Transactions

In accordance with Article 5(1)(b) of the Market Abuse Regulation (EU) No 596/2014 (as it forms part of the law of the United Kingdom by virtue of the European Union (Withdrawal) Act 2018 as that Act is amended from time to time), a full breakdown of the individual trades made by Investec on behalf of the Company as part of the Programme is set out in the Schedule to this announcement available through the link below:

http://www.rns-pdf.londonstockexchange.com/rns/8020D_1-2026-5-11.pdf

Notes to editors:

Keller is the world's largest geotechnical specialist contractor providing a wide portfolio of advanced foundation and ground improvement techniques used across the entire construction sector. With around 10,000 staff and operations across five continents, Keller tackles an unrivalled 5,500 projects every year, generating annual revenue of c£3bn.