United Utilities Group PLC - LEI: 2138002IEYQAOC88ZJ59
United Utilities PLC - LEI: 213800KYT12UFB2VE455

United Utilities Water Finance PLC - LEI: 213800313INX42GDLR44
United Utilities Water Limited - LEI: 213800RQ5FMB2GQ69174

Publication of Supplementary Offering Circular

The following supplementary offering circular has been approved by the Financial Conduct Authority and is available for viewing:

Supplementary offering circular dated 27 March 2026 (the "Supplement") to the offering circular dated 14 November 2025 (the "Offering Circular"), relating to United Utilities PLC and United Utilities Water Finance PLC's multi-issuer GBP 12,000,000,000 Euro Medium Term Note Programme (the "Programme"). Each of United Utilities PLC and United Utilities Water Finance PLC is an issuer under the Programme. Notes issued by United Utilities Water Finance PLC will be guaranteed by United Utilities Water Limited.

To view the full Supplement, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/4725Y_1-2026-3-27.pdf

A copy of the Supplement has been submitted to the National Storage Mechanism and will shortly be available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

For further information, please contact Brendan Murphy, Treasurer, United Utilities Group PLC, on +44 (0) 7717 099 887.

United Utilities Group PLC's ordinary shares trade on the London Stock Exchange and its ADRs, each equal to two ordinary shares, trade over the counter under the Trading Symbol 'UUGRY'.

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Supplement may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Offering Circular) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Offering Circular is not addressed. Prior to relying on the information contained in the Supplement you must ascertain from the Offering Circular whether or not you are part of the intended addressees of the information contained therein.

In particular, the Offering Circular (as supplemented by the Supplement) does not constitute an offer of securities for sale in the United States. This is not for distribution in the United States. The securities described herein have not been, and will not be, registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), or under any relevant securities laws of any state of the United States of America and are subject to U.S. tax law requirements. Subject to certain exceptions, the securities may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons or to persons within the United States of America, as such terms are defined in Regulation S under the Securities Act. There will be no public offering of the securities in the United States.

Your right to access this service is conditional upon complying with the above requirement.

END