Additional Listing

Costain Group PLC

27 May 2025

2024 Final Dividend - Scrip Alternative

Costain Group PLC ('the Company') announces that, following approval by shareholders at the Company's 2025 Annual General Meeting of the renewal of the scrip dividend scheme, elections have been made by shareholders to receive 432,388 ordinary shares of 1p each in the Company ("Shares") in lieu of cash in respect of their final dividend for the year ending 31 December 2024, which is to be paid on Thursday 29 May 2025.

Application has therefore been made for the admission of 432,388 new Shares to the Official List of the UK Listing Authority and to trading on the London Stock Exchange's market for listed securities. The new Shares will rank pari passu with the Company's existing issued Shares and dealings are expected to commence on or around Friday 30 May 2025.

The mandate form and the scrip dividend booklet containing the terms of the Company's scrip dividend scheme are set out on the Company's website at: Dividend (Scrip) | Costain

Copies of the above forms have also been submitted to the National Storage Mechanism and are available for inspection at National Storage Mechanism | FCA.

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