Total Voting Rights

Costain Group PLC

(the 'Company')

3 November 2025

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 October 2025, the Company's issued share capital comprised 266,714,895 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 figure of 266,714,895 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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