Costain Group PlcLSE: COST

Directorate change

· Issued by Costain Group PLC

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Costain Group PLC

4 March 2026

External Appointment

In accordance with UK Listing Rule 6.4.9R(2), Costain Group PLC announces that Kate Rock, Non-Executive Chair and Chair of the Nomination Committee, has been appointed as an Independent Non-Executive Director of Chemring Group PLC (Chemring), a company listed on the London Stock Exchange, with effect from 1 April 2026. Upon joining Chemring, Kate will become Senior Independent Director and member of their Audit, Nomination and Remuneration Committees.

Enquiries

Investors and analysts

matt.jones@costain.com

Matthew Jones, Costain

+44 (0) 7860 922 341

Company Secretariat

costaincosec@costain.com

Katie Mullins

+44 (0) 7353 006 675

Cyd Trumper

+44 (0) 7879 133 084

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