THIS ANNOUNCEMENT CONTAINS INFORMATION WITHIN THE MEANING OF ARTICLE 7 OF THE MARKET ABUSE REGULATION (EU) 596/2014 AS IT FORMS PART OF UK LAW BY VIRTUE OF

THE EUROPEAN UNION (WITHDRAWAL) ACT 2018

4 December 2024

Costain Wins New HS2 Systems Contract

Contract to deliver mechanical & electrical systems

Costain Group PLC ("Costain") today announces that it is to be awarded a new contract by HS2 Ltd. as a sole supplier to deliver tunnel and lineside mechanical and electrical (M&E) systems for HS2, with a total contract value worth a minimum of £400m to Costain. This contract, to be signed in due course, starts in Q1 2025 for a seven-year period, with the option for additional contract extensions.

The contract will see Costain deliver the design, supply, manufacture, installation, testing and commissioning of HS2's Tunnel and Lineside M&E systems during construction.

Alex Vaughan, CEO of Costain, said:

"Costain has a long-standing involvement with the UK's largest strategic infrastructure programme and this new contract is a testament to the strength of our collaborative and successful relationship with HS2. Our teams will draw on their experience and expertise to deliver world-class systems, using the latest technology to drive efficiency."

This announcement contains inside information.  The person responsible for this announcement at Costain is Helen Willis, Chief Financial Officer.

Enquiries:

Notes to editors

Costain helps to improve people's lives by creating connected, sustainable infrastructure that enables people and the planet to thrive. We shape, create and deliver pioneering solutions that transform the performance of the infrastructure ecosystem across the UK's transport, energy, water, and defence markets.

We are organised around our customers, anticipating and solving their challenges and helping to improve performance. By bringing together our unique mix of construction, consulting and digital experts we engineer and deliver sustainable, efficient and practical solutions.