Pennon Regulatory News (PNN)

THIS ANNOUNCEMENT RELATES TO THE DISCLOSURE OF INFORMATION THAT QUALIFIED AS INSIDE INFORMATION FOR THE PURPOSES OF ARTICLE 7(1) OF THE MARKET ABUSE REGULATION (EU) 596/2014 AS IT FORMS PART OF UK DOMESTIC LAW BY VIRTUE OF THE EUROPEAN UNION (WITHDRAWAL) ACT 2018, AS AMENDED (THE "UK MARKET ABUSE REGULATION").

7 July 2026

Pennon Group plc - LEI: 213800V1CCTS41GWH423

South West Water Finance Plc - LEI: 213800OV68U446W4NV89South West Water Limited - LEI: 213800FR2VAOKRYRHX45

EMTN Programme: Successful pricing of GBP 250mn 6.000 per cent. Fixed Rate Guaranteed Notes due 2035 and GBP 100mn 3.806 per cent. Index-Linked Guaranteed Notes due 2041 (together the "New Notes")

South West Water Finance Plc (the "Issuer") has successfully priced a debt transaction of New Notes that will be issued under the Issuer's EMTN programme established in 2024, pursuant to a base prospectus dated 21 August 2025 (as supplemented on 1 December 2025 and 18 June 2026) (the "Base Prospectus" and the proposed "Issuance"). The Base Prospectus is available on Pennon Group plc's website at: https://www.pennon-group.co.uk/investor-information/debt-investors.

The New Notes will be guaranteed by South West Water Limited (the "Guarantor") and the proceeds from the Issuance will be on-lent by the Issuer to the Guarantor [and used for its general corporate purposes][1]. Application is to be made for the New Notes to be admitted to trading on the Main Market of the London Stock Exchange plc.

The New Notes, which will be issued on 16 July 2026, are subject to final legal documentation and customary closing conditions.

For further information, please contact Chris Tregenna, Group Treasurer, on 07733 312479.

DISCLAIMER

This announcement does not constitute or form part of an offer to sell or the solicitation of an offer to sell or subscribe for or otherwise acquire any securities (including, without limitation, the New Notes). Any investment decision to purchase any New Notes should be made solely on the basis of the information contained in the Base Prospectus and the final terms to be published by the Issuer relating to the New Notes, and no reliance is to be placed on any information given or any representations made in connection with the New Notes other than those contained in the Base Prospectus and the final terms to be published by the Issuer relating to the New Notes. This announcement is an advertisement and is not a prospectus for the purposes of the Prospectus Rules: Admission to Trading on a Regulated Market sourcebook. The Base Prospectus is available, and the final terms will, when published, be available on Pennon Group plc's website at: https://www.pennon-group.co.uk/investor-information/debt-investors.

In particular, this announcement is not for distribution in the United States and the notes offered by the Base Prospectus 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 New Notes in the United States.

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

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