Total Voting Rights

PENNON GROUP PLC

FOR IMMEDIATE RELEASE

TOTAL VOTING RIGHTS AND CAPITAL

In accordance with the FCA's Disclosure Guidance and Transparency Rule 5.6.1 R, as at 28 February 2026 Pennon Group plc's issued share capital consists of 471,981,269 ordinary shares of 61.05p each, with 5,628 shares held in treasury. Therefore, the total number of voting rights in Pennon Group plc is 471,975,641 shares.

The figure above (471,975,641) may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Pennon Group plc under the FCA's Disclosure Guidance and Transparency Rules.

www.pennon-group.co.uk

Andrew Garard

Group General Counsel and Company Secretary