Admission of Nil Paid Rights

Pennon Group plc (the "Company") announces that, pursuant to the Rights Issue announced on 29 January 2025, 185,928,002 New Ordinary Shares will be admitted, nil paid, to listing on the equity shares (commercial companies) category of the Official List maintained by the FCA and will be admitted, nil paid, to trading on the London Stock Exchange plc's main market for listed securities at 8:00 a.m. today.

The Record Date for entitlements under the Rights Issue was close of business on 28 January 2025. Provisional Allotment Letters have been posted to Qualifying Non-CREST Shareholders, Qualifying CSN Shareholders and Qualifying Watershare+ Shareholders (other than, subject to certain limited exceptions, such Shareholders with registered addresses, or who are resident or located, in any of the Excluded Territories). CREST stock accounts of Qualifying CREST Shareholders (other than, subject to certain limited exceptions, Qualifying CREST Shareholders with registered addresses, or who are resident or located, in any of the Excluded Territories) are expected to be credited with Nil Paid Rights in as soon as practicable after 8:00 a.m. today.

Capitalised terms used but not otherwise defined in this announcement shall have the meanings set out in the prospectus dated 29 January 2025 (the "Prospectus"), which is available on the Company's website at: www.pennon-group.co.uk/investor-information.

NOTICE TO ALL INVESTORS

INFORMATION TO DISTRIBUTORS