Publication of Annual Report and Accounts 2026

PENNON GROUP PLC (THE "COMPANY")

PUBLICATION OF ANNUAL REPORT AND ACCOUNTS 2026 & NOTICE OF MEETING 2026

The Company's Annual Report and Accounts for the year ended 31st March 2026 (the "Annual Report") and Notice of Annual General Meeting 2026 (the "Notice of Meeting") have been published on the Company's website and are available to view at www.pennon-group.co.uk/investor-information/shareholder-services/general-meetings. A hard copy version of the Annual Report, Notice of Meeting and Form of Proxy will be sent to those shareholders who have elected to receive paper communications.

In compliance with the UK Listing Rule 6.4.1R, the following documents have been submitted to the National Storage Mechanism and will shortly be available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

· Annual Report

· Notice of Meeting

· Form of Proxy for the 2026 Annual General Meeting ("AGM")

· Notice of Availability 2026

The Company will hold its AGM at Bristol Water, Bridgwater Road, Bristol, BS13 7AT on Wednesday, 8th July 2026 at 10:00am. Further information regarding how to register your attendance at the AGM, safety and security arrangements, asking questions and voting at the AGM are set out in the Notice of Meeting.

In accordance with the FCA's Disclosure Guidance and Transparency Rules 6.3.5R (1A), the information required to be communicated in unedited full text was included in the Full Year Results 2025/2026 announcement released on 10th June 2026 and in the Annual Report, which will shortly be available for inspection at the NSM.

Andrew Garard

Group General Counsel & Company Secretary

16th June 2026