Costain Group PlcLSE: COST

Director/PDMR Shareholding

· Issued by Costain Group PLC

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Costain Group PLC (the Company)

11 December 2025

DIRECTOR/PDMR/PCA DEALING

The Company announces that Fiona MacAulay, Non-Executive Director, has purchased 6,347 Ordinary Shares in the Company at £1.57 per share on 10 December 2025. Her resulting shareholding in the Company is 6,347 shares representing 0.00002% of the Company's issued share capital.

The Notification of Dealing Form set out below is provided in accordance with the requirements of the UK Market Abuse Regulation.

Notification of Dealing Form

1.

Details of the Person Discharging Managerial Responsibility ("PDMR") / person closely associated with them ("PCA")

a)

Name

FIONA MACAULAY

2.

Reason for the notification

a)

Position /status

NON-EXECUTIVE DIRCETOR (PDMR)

b)

Initial notification / amendment

INITIAL NOTIFICATION

3.

Details of the Issuer

a)

Name

COSTAIN GROUP PLC

b)

LEI code

213800PKIJBZ2EDTKC88

4.

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

ORDINARY SHARES OF 1 PENCE EACH

ISIN:  GB00B64NSP76

b)

Nature of the transaction

PURCHASE OF 6,347 SHARES

c)

Price(s) and volume(s)

Price(s)

Volume(s)

£1.57

6,347

d)

Aggregated information

-  Aggregated volume

-  Price

N/A

e)

Date of the transaction

10 DECEMBER 2025

f)

Place of the transaction

XLON

Enquiries:

Investors and analysts

Matt Jones, Costain

Matt.Jones@costain.com

+44 (0) 7860 922 341

Financial media - Headland

Andy Rivett-Carnac

Charlie Twigg

costain@headlandconsultancy.com

+44 (0) 7968 997365

+44 (0) 7946 494568

Company analysis