Costain Group: Block Listing Six Monthly Return

Name of  applicant :

Costain Group PLC ("the Company")

Name of scheme(s):

The Company's employee Sharesave Plan.

Period of return:

From:

01 July 2022

To:

31 December 2022

Balance of unallotted securities under scheme(s) from previous return:

58,293

Plus:     The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):

Nil

Less:     Number of  securities  issued/allotted under scheme(s) during period (see LR3.5.7G):

Nil

Equals:     Balance under scheme(s) not yet issued/allotted at end of period:

58,293

Name of contact:

Cyd Trumper, Assistant Company Secretary

Telephone number of contact:

07876 133084