10 September 2026

THE ALUMASC GROUP PLC

(“Alumasc” or the ‘Group’)

 Notice of Full Year Results and Investor Presentation

Alumasc, the premium sustainable building products, systems and solutions Group, will publish its audited results for the 12 months ended 30 June 2026 ("Full Year Results") on Tuesday 15 September 2026.

Vijay Thakrar, Interim Executive Chair, and Simon Dray, Chief Financial Officer, will provide an in-person presentation to sell-side analysts at 9am BST on Tuesday 15 September 2026, this will also be available via Zoom. If you would like to attend, please RSVP to [email protected].

An online investor presentation and Q&A session, which is open to all existing and potential shareholders via the Investor Meet Company platform will be held on Wednesday, 16 September 2026 at 3:00pm. Please use the link below to register.

Questions can be submitted pre-event via your Investor Meet Company dashboard up until 15 September 2026, 09:00 BST, or at any time during the live presentation.

Investors can sign up to Investor Meet Company for free and meet ALUMASC GROUP PLC via:

https://www.investormeetcompany.com/alumasc-group-plc/register-investor

Investors who already follow ALUMASC GROUP PLC on the Investor Meet Company platform will automatically be invited.

A recording of the presentation and a copy of the slides will be available following the event on the Company’s website at https://www.alumasc.co.uk/investor-relations.

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)207 220 0500

Will Smith (Corporate Broking)

Peel Hunt (Joint Broker)   

Mike Bell                                                                                                                   +44 (0)207 418 8831

Ed Allsopp 

Camarco (Financial PR)  

Ginny Pulbrook                                                                                                          +44 (0)203 757 4980

Tilly Butcher      

[email protected]

Notes to Editors:

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