IMMEDIATE RELEASE

4 October 2024

THE ALUMASC GROUP PLC

("ALUMASC" or the "GROUP")

STRATEGIC HIRE IN WATER MANAGEMENT DIVISION

Alumasc (ALU.L), the premium sustainable building products, systems and solutions group is pleased to announce a strategic hire to improve the depth and strength of its operational management team. David Adams will join as Managing Director of Alumasc's Water Management division and a member of its divisional operating board on 16 December 2024.

David brings significant senior leadership experience and a track record of successfully growing sales, including exports, and improving operational efficiency and customer service, most recently as Chief Executive Officer of Mabey Hire Ltd. David's previous experience includes Divisional Managing Director roles at RMD Kwikform and Knauf Insulation.

Water Management is Alumasc's largest division, comprising 48% of Group revenue, and has achieved 12% compound annual growth in underlying operating profits over the last five years.

Paul Hooper, Alumasc's Chief Executive, has been acting Managing Director of Water Management since 2019, and will hand over his interim divisional responsibilities to David.

Paul Hooper, Chief Executive said "I'm delighted to welcome David to Alumasc. Alumasc's Water Management division has grown significantly over the past five years and this addition to our team will support continuing strong momentum for that business. David has proven experience in delivering growth throughout his career and will, I'm sure, make a very positive contribution."

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.

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Notes to Editors:

Alumasc is a UK-based supplier of premium sustainable building products, systems and solutions. Almost 80% of Group sales are driven by building regulations and specifications (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: Water Management; Building Envelope; and Housebuilding Products.