Ordinary Share Nominal Value Reduction

Costain Group PLC

16 May 2024

Ordinary Share Nominal Value Reduction

As approved by shareholders at its Annual General Meeting held today, 16 May 2024, Costain Group PLC (the Company) confirms that the nominal value of the Company's Ordinary Shares will reduce from 50 pence to 1 pence with effect from 8am on 17 May 2024.

The Company's issued share capital is unchanged, and each shareholder's proportionate interest in the share capital of the Company will remain unchanged. Aside from the change in nominal value, the rights attaching to the Ordinary Shares (including voting and dividend rights and rights on a return of capital) will remain unchanged.

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Costain helps to improve people's lives by creating connected, sustainable infrastructure that enables people and the planet to thrive. We shape, create and deliver pioneering solutions that transform the performance of the infrastructure ecosystem across the UK's transport, energy, water, and defence markets.

We are organised around our customers anticipating and solving their challenges and helping to improve performance. By bringing together our unique mix of construction, consulting and digital experts we engineer and deliver sustainable, efficient and practical solutions.