Costain Group PLC
("Costain" or the "Company")

Transaction in shares by a Person Discharging Managerial Responsibility ("PDMR") 

 Ordinary Shares of 50p each

The Company received notification on 30 June 2016 of the following transaction in its ordinary shares of 50p each ("Ordinary Shares"):

On 30 June 2016, Dr Paul Golby, the Non-Executive Chairman of the Company, purchased 35,000 Ordinary Shares at a price of 317.44p per share. The transaction was carried out in London.

This announcement is made following a notification made in accordance with Disclosure and Transparency Rule 3.1.2R.

30 June 2016

Enquiries:

Costain Group PLC                                                                                      Tel: 01628 842444
Tracey Wood

Company Secretary