18 July 2024 DIRECTORATE CHANGES AND DECLARATION Keller Group plc (the "Company" or "Keller"), the world's largest geotechnical specialist contractor, announces the appointment of Stephen King as an independent non-executive director with effect from 1 September 2024. Stephen will be a member of the Audit and Risk, Nomination and Governance, Remuneration, and Sustainability Committees. Stephen has a wealth of senior level experience within the industrial, engineering and manufacturing sectors, including a number of executive and non -executive roles. Stephen is an independent non-executive director and Chairman of the Audit Committee at Chemring Group PLC, where he was appointed in 2019. Stephen retired as Group Finance Director of Caledonia Investments plc in 2018. He was previously a non-executive director and Chairman of the Audit Committee at Signature Aviation plc and The Weir Group plc, and Senior Independent Director and Chair of the Audit Committee of TT Electronics plc. Stephen was Finance Director at De La Rue plc from 2003 to 2009, and prior to that at Midlands Electricity plc. A Chartered Accountant, Stephen has also held senior financial positions at Lucas Industries plc and Seeboard plc, and was a non-executive director of Camelot plc. Keller further announces that Peter Hill CBE has given notice of his intention to retire as Chairman and step down as a director of the Company during the first half of 2025,after what will have been approximately nine years on the Board. A formal external search process is underway led by Baroness Kate Rock, Keller's Senior Independent Director, supported by an external search firm. The Company also reports Peter's appointment as an independent non-executive director and Chairman designate at Synthomer plc with effect from 1 September 2024. Following an induction and handover period, Peter will be appointed as Chairman of Synthomer plc on 1 January 2025. This notification is made in accordance with paragraph 9.6.11R of the Listing Rules of the Financial Conduct Authority. For further information, please contact: Keller Group plcwww.keller.com Kerry Porritt, Group Company Secretary and Legal Advisor020 7616 7575 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 9,500 staff and operations across five continents, Keller tackles an unrivalled 5,500 projects every year, generating annual revenue of c.£3bn. LEI number: 549300QO4MBL43UHSN10 Classification: 3.1 Additional regulated information The person responsible for making this announcement is Kerry Porritt, Group Company Secretary and Legal Advisor. This information was brought to you by Cision http://news.cision.com https://news.cision.com/keller-group-plc/r/directorate-changes-and-declaration,c4016497