THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF ARTICLE 7 OF THE MARKET ABUSE REGULATION (EU) 596/2014.

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION IN OR INTO OR TO ANY PERSON LOCATED OR RESIDENT IN, OR AT ANY ADDRESS IN, THE UNITED STATES OF AMERICA, ITS TERRITORIES AND POSSESSIONS, ANY STATE OF THE UNITED STATES OF AMERICA OR THE DISTRICT OF COLUMBIA (THE "UNITED STATES") OR IN OR INTO OR TO ANY PERSON RESIDENT OR LOCATED IN ANY OTHER JURISDICTION WHERE IT IS UNLAWFUL TO RELEASE, PUBLISH OR DISTRIBUTE THIS ANNOUNCEMENT.

Thames Water Utilities Finance plc announces the results of its Tender Offer in respect of its Class A £500,000,000
4 per cent. Guaranteed Unwrapped Bonds due June 2025[*] (ISIN: XS1078777114)

29 January 2024. Thames Water Utilities Finance plc[†] (the "Company") announces today the results of its invitation to the holders of its outstanding Class A £500,000,000 4 per cent. Guaranteed Unwrapped Bonds due June 2025 (ISIN: XS1078777114) (the "Notes") to tender their Notes for purchase by the Company for cash announced on 22 January 2024, subject to the satisfaction or waiver of the New Financing Condition (as defined in the Tender Offer Memorandum (as defined below)) (the "Offer").

This announcement is for information purposes only and should be read in conjunction with the tender offer memorandum dated 22 January 2024 (the "Tender Offer Memorandum") prepared by the Company. Capitalised terms used in this announcement but not defined herein have the meanings given to them in the Tender Offer Memorandum.

The New Financing Condition is expected to be satisfied on 30 January 2024.

The Company hereby announces that it accepts for purchase, subject to the satisfaction or waiver of the New Financing Condition, Notes validly tendered for purchase in the Offer in the nominal amount set out in the table below. Pricing of the Offer for the Notes is also set out in the table below.

The Company will also pay an Accrued Interest Payment with respect to the purchased Notes.

The Offer commenced on 22 January 2024 and expired at 4:00 p.m. (London time) on 26 January 2024. Subject to the satisfaction or waiver of the New Financing Condition, settlement of the Offer is expected to take place on 30 January 2024 (the "Settlement Date").

Questions and requests for assistance in connection with the Offer may be directed to the Dealer Managers, the contact details for each of which are set out below:

MARKET ABUSE REGULATION

This announcement is released by Thames Water Utilities Finance plc and contains information that qualified or may have qualified as inside information for the purposes of Article 7 of the Market Abuse Regulation (EU) 596/2014 ("MAR"), encompassing information relating to the Offer and proposed new issue of New Notes described above. For the purposes of MAR and Article 2 of Commission Implementing Regulation (EU) 2016/1055, this announcement is made by David Gregg, Director of Thames Water Utilities Finance plc.

DISCLAIMER

This announcement must be read in conjunction with the Tender Offer Memorandum. Neither this announcement nor the Tender Offer Memorandum constitutes an offer to buy or the solicitation of an offer to sell Notes (and tenders of Notes in the Offer will not be accepted from Noteholders) in any circumstances in which such offer or solicitation is unlawful. The distribution of this announcement and the Tender Offer Memorandum in certain jurisdictions may be restricted by law. Persons into whose possession this announcement and the Tender Offer Memorandum comes are required by each of the Company, the Dealer Managers and the Tender Agent to inform themselves about, and to observe, any such restrictions. The Offer has now expired.