Costain Group PLC

2 March 2026

Costain returns to FTSE 250

Costain Group PLC ("Costain") is pleased to confirm that it has today returned to the FTSE 250 index for the first time in more than 20 years.

The re-entry comes after years of consistent strong financial performance, building strong positions in growing markets and delivering increasing shareholder returns.

Alex Vaughan, Chief Executive Officer of Costain, commented: "I am extremely proud of the whole Costain team and the role they have played in achieving Costain's return to the FTSE 250. This significant milestone follows what has been a sustained period of strong financial performance for the business, with increased profitability, positive cash generation and continued momentum in securing high-quality work across our chosen growth markets. Our performance is testament to the success of our strategy and the commitment and attitude of our people. We look forward to continuing our commitment to create further value for all our stakeholders."

Costain will announce its results for the year ended 31 December 2025 on 10 March 2026.

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Costain improves people's lives by creating connected, sustainable infrastructure that enables people and the planet to thrive. Through the delivery of predictable, best-in-class solutions across the transport, water, energy and defence markets, we are creating a sustainable future and securing a more prosperous, resilient and decarbonised UK.