Costain Group PLC

(the 'Company')

2 July 2025

Correction to announcement number 2675P made at 14:33 on 1 July 2025 ('Total Voting Rights'): The RNS has been corrected by removing the paragraph stating there had been an increase in the total number of voting rights. All other details remain unchanged. The full amended text is shown below.

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 30 June 2025, the Company's issued share capital comprises 272,896,316 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 272,896,316 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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