17 July 2026

THE ALUMASC GROUP PLC

("Alumasc" or the 'Group')

Suspension of CEO and Changes in Leadership Responsibilities

Alumasc (ALU.L), the premium sustainable building products, systems and solutions Group announces that CEO, Pamela Bingham, has been suspended by the Board pending an investigation into matters relating to her professional conduct. The Company is undertaking a full investigation, supported by its professional advisors.

Whilst this process is ongoing, Vijay Thakrar, Non-Executive Chair, will assume the role and responsibilities of Executive Chair temporarily. Vijay will be supported by Alumasc's well-established management teams, including the Group's Divisional Managing Directors and the CFO, who have approximately thirty-five years' combined tenure at Alumasc, to provide business leadership and continuity.

As set out in the trading update provided this morning, the Group continues to deliver a very resilient performance amidst a challenging market backdrop, and enters the new financial year with a significantly expanded order book. The Company will make further updates to shareholders in due course.

This announcement contains inside information for the purposes of Article 7 of the Market Abuse Regulation (EU) 596/2014 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 ("MAR"), and is disclosed in accordance with the Company's obligations under Article 17 of MAR.  The person responsible for making this announcement on behalf of the Company is Simon Dray, CFO/Group Company Secretary.

Enquiries:

The Alumasc Group plc                  

Vijay Thakrar (Interim Executive Chair)                                       +44 (0)1536 383844

Simon Dray (CFO/Company Secretary)

Cavendish (Nominated Adviser & Joint Broker)                     

Julian Blunt, Edward Whiley (Corporate Finance)                       +44 (0)207 908 6000

Will Smith (Corporate Broking)

Peel Hunt (Joint Broker)                 

Mike Bell                                                                                       +44 (0)207 418 8831

Ed Allsopp           

Camarco (Financial PR)                 

Ginny Pulbrook                                                                              +44 7961 315 138

Tilly Butcher                                                                                   +44 7972 013 692

[email protected]

Notes to Editors:

Alumasc is a UK-based supplier of premium sustainable building products, systems and solutions. Around 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.