23 September 2025

THE ALUMASC GROUP PLC

('Alumasc' or 'the Group')

Retirement of Chief Executive

2025 Notice of the AGM and Annual Accounts

Alumasc, the premium sustainable building products, systems and solutions group, today announces that Paul Hooper, Chief Executive, will be retiring from Alumasc on 31 March 2026, after 25 years with the Group and 23 years in the role. The search for Paul's replacement is well progressed and an announcement regarding a successor will be made in due course.

Paul joined the Board of Alumasc as Group Managing Director on 2 April 2001 and was appointed Chief Executive in March 2003. Under his leadership, the Group transitioned from a diversified industrial group operating across the construction, industrial and engineering sectors to a focused building products business, supplying premium, sustainable products to markets supported by long-term environmental growth drivers. Under this refreshed strategy, the Group has achieved compound annual growth in underlying profit before tax of 13.3% over the last six years.

Vijay Thakrar, Chair of Alumasc, said:

"On behalf of the Board and our various stakeholders, I want to thank Paul for his dedicated and committed leadership of Alumasc over a period of significant change. He will be leaving a strong and agile group, well placed to capitalise on the opportunities in its markets and we wish him the best for his well-deserved retirement.

Paul will continue to lead the business over the coming months as we transition to a new Chief Executive and, alongside our other Executive Directors, will continue to focus on executing Alumasc's growth strategy and delivering long-term sustainable value to all our stakeholders."

Paul Hooper, Chief Executive of Alumasc, said:

"It has been a tremendous privilege to lead Alumasc. I am looking forward to stepping aside from full-time executive life at the end of March 2026 following a record performance of the Group and for each of its divisions in the year ended 30 June 2025. I would like to thank all my talented colleagues - past and present - for their support. I am proud of all that we have achieved together and look forward to handing over to a new Chief Executive who will continue to help to realise Alumasc's potential."

Exit Arrangements:

In accordance with the terms of Paul Hooper's service agreement and the Company's Remuneration Policy, the Board confirms  the following payments and benefits will be provided on retirement. Paul Hooper will receive his current salary and benefits until 31 March 2026. There will be no payment made in lieu of notice.

Paul will be eligible for an annual bonus in 2026 for the period from 1 July 2025 to 30 June 2026, calculated according to performance against targets. This will be pro-rated for time served to 31 March 2026 and paid in Autumn 2026 at the same time as continuing employees.

Paul will receive a Performance Share Award under the 2025 Alumasc LTIP of 75% of his base salary, which will be granted in October 2025. Subject to meeting performance conditions this award will vest in October 2028 and be pro-rated for time served to 31 March 2026.

Paul's LTIPs awarded in 2022, 2023 and 2024 will vest in late 2025, 2026 and 2027 respectively, subject to meeting performance conditions, and will be pro-rated for time served to 31 March 2026.

2025 AGM Notice and Annual Report

The 2025 Annual Report and notice of AGM has now been posted to shareholders and is available to view on the Company's website at https://www.alumasc.co.uk/investor-relations.

The Company's Annual General Meeting will be held at 10am on 24 October 2025 at Alumasc Roofing, White House Works, Bold Road, Sutton, St Helens, Merseyside WA9 4JG.

Certain information contained in this announcement would have constituted inside information (as defined by Article 7 of Regulation (EU) No 596/2014), as it forms part of domestic law by virtue of the European Union (Withdrawal) Act 2018) ("MAR") prior to its release as part of this announcement and is disclosed in accordance with the Company's obligations under Article 17 of those Regulations. The person responsible for making this announcement on behalf of the Company is Helen Ashton, Group Company Secretary.

Enquiries:

Notes to Editors:

Alumasc is a UK-based supplier of premium building products, systems and solutions. Around 80% of Group sales are driven by building regulations and specifications (developers/housebuilders, architects, and structural engineers) because of the performance characteristics offered.

The Group has three business segments with strong positions and brands in their individual markets. The three segments are: Building Envelope; Water Management; and Housebuilding Products.