Costain Group PLC

(the 'Company')

2 September 2024

Total Voting Rights and Capital

In conformity with the Financial Conduct Authority's ("FCA") Disclosure Guidance and Transparency Rule 5.6.1(R) the Company notifies the market that:

As at 31 August 2024, the Company's issued share capital comprises 278,274,103 ordinary shares of 1 pence each, with each share carrying the right to one vote. The Company does not hold any ordinary shares in treasury. 

The decrease in the number of issued ordinary shares has arisen due to the cancellation of ordinary shares purchased under the buyback programme, as announced on 21 August 2024, and reflects purchases up to and including 28 August 2024.

The figure of 278,274,103 shares may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in Costain, or a change to their interest in Costain, under the FCA's Disclosure Guidance and Transparency Rules.

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