Costain Group PlcLSE: COST

Block Listing Interim Review

· Issued by Costain Group PLC

Costain Group PLC


BLOCK LISTING SIX MONTHLY RETURN

(Note: Italicised terms have the same meaning as given in the Listing Rules.)

01 July 2026

Name of applicant:

Costain Group PLC ("the Company")

Name of scheme(s):

The Company's Employee Sharesave Plan.

Period of return:

From:

1 January 2026

To:

30 June 2026

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 UKLR20.6.6R):

Nil

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

58,293

There was no change in the reporting period.

Name of contact:

Cyd Trumper, Senior Assistant Company Secretary

Telephone number of contact:

07876 133084

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