Severn Trent PLC

Prospectus • May 27, 2025

FOURTH SUPPLEMENTARY PROSPECTUS DATED 22 MAY 2025 TO THE PROSPECTUS DATED 22 JULY 2024

SEVERN TRENT UTILITIES FINANCE PLC

(incorporated with limited liability in England and Wales with registered number 2914860)

as an Issuer

SEVERN TRENT PLC

(incorporated with limited liability in England and Wales with registered number 2366619)

as an Issuer

SEVERN TRENT WATER LIMITED

(incorporated with limited liability in England and Wales with registered number 2366686) as the Guarantor of Notes issued by Severn Trent Utilities Finance Plc

€10,000,000,000 Euro Medium Term Note Programme

This fourth Supplementary Prospectus (the "Supplementary Prospectus" which definition shall also include all information incorporated by reference herein) constitutes a supplementary prospectus for the purposes of Article 23 of Regulation (EU) 2017/1129 as it forms part of United Kingdom domestic law by virtue of the European Union (Withdrawal) Act 2018, as amended (the "UK Prospectus Regulation") and has been prepared by Severn Trent Plc and Severn Trent Utilities Finance Plc (each an "Issuer" and together the "Issuers") and Severn Trent Water Limited (the "Guarantor") for use in connection with Notes issued from time to time under the above-mentioned €10,000,000,000 Euro Medium Term Note Programme (the "Programme") established by the Issuers. A prospectus dated 22 July 2024 (the "Prospectus") has been prepared by the Issuers and the Guarantor and approved as a base prospectus by the United Kingdom Financial Conduct Authority (the "Financial Conduct Authority") in its capacity as competent authority under the UK Prospectus Regulation, for use in connection with the Programme. This Supplementary Prospectus supplements, updates and forms part of the Prospectus and should be read in conjunction therewith, together with the supplements dated 22 November 2024, 24 January 2025 and 31 March 2025 and any other supplements to the Prospectus. Except as otherwise provided in this Supplementary Prospectus, terms and expressions defined in the Prospectus have the same meaning when used in this Supplementary Prospectus.

The purpose of this Supplementary Prospectus is to incorporate by reference into the Prospectus the Preliminary Results (as defined below).

Preliminary Financial Results

On 21 May 2025, Severn Trent Plc published its preliminary announcement of annual results for the year ended 31 March 2025 (the "Preliminary Results").

A copy of the Preliminary Results has been filed with the Financial Conduct Authority and by virtue of this Supplementary Prospectus, the following sections of the Preliminary Results are incorporated in, and form part of, this Supplementary Prospectus and the Prospectus:

• the heading "Consolidated income statement" and the table thereunder;
• the heading "Consolidated statement of comprehensive income" and the table thereunder;
• the heading "Consolidated statement of changes in equity" and the table thereunder;
• the heading "Consolidated balance sheet" and the table thereunder;
• the heading "Consolidated cash flow statement" and the table thereunder; and
• the section entitled "Notes to the financial statements".

The Preliminary Results have been properly prepared on the basis set out in Note 1 on page 24 of the Preliminary Results and, as stated therein, the basis of accounting used is consistent with the accounting policies of the Group.

Any information contained in the Preliminary Results which is not expressly incorporated by reference in this Supplementary Prospectus does not form part of this Supplementary Prospectus and is either not relevant to investors or is covered elsewhere in this Supplementary Prospectus or the Prospectus. Any information or documents which are incorporated by reference, either expressly or implicitly, in the Preliminary Results incorporated by reference in this Supplementary Prospectus shall not form part of this Supplementary Prospectus for the purposes of the UK Prospectus Regulation.

Documents Incorporated by Reference

The Preliminary Results will be available (free of charge) on Severn Trent Plc's website at: https://www.severntrent.com/investors/.

Any information or documents which are incorporated by reference, either expressly or implicitly, in the Preliminary Results shall not form part of this Supplementary Prospectus.

Significant Change

The first paragraph of the section entitled 'Significant or Material Change' on page 123 of the Prospectus shall be deemed to be deleted and replaced as follows:

"There has been no significant change in the financial position or financial performance of Severn Trent and its subsidiaries taken as a whole since 31 March 2025, which is the accounting reference date for the latest publicly available financial information, and there has been no material adverse change in the prospects of Severn Trent since 31 March 2024, which is the accounting reference date for the latest audited financial information."

General Information

The Issuers and the Guarantor accept responsibility for the information contained in this Supplementary Prospectus. To the best of the knowledge of the Issuers and the Guarantor the information contained in this Supplementary Prospectus is in accordance with the facts and this Supplementary Prospectus makes no omission likely to affect its import.

Copies of this Supplementary Prospectus, the Prospectus and all documents or information incorporated by reference in this Supplementary Prospectus are available for inspection during normal office hours from the registered office of each Issuer and from the specified offices of the Paying Agents.

To the extent that there is any inconsistency between (a) any statement in this Supplementary Prospectus or any statement incorporated by reference into the Prospectus by this Supplementary Prospectus and (b) any other statement in or incorporated in the Prospectus prior to the date of this Supplementary Prospectus, the statements in (a) above will prevail. Save as disclosed in this Supplementary Prospectus or any document incorporated by reference in this Supplementary Prospectus there has been no other significant new factor, material mistake or material inaccuracy relating to information included in the Prospectus since the publication of the Prospectus.

This Supplementary Prospectus contains references to certain websites. No such website, nor (except for information expressly incorporated by reference herein) any information contained on any such website, is incorporated in this Supplementary Prospectus or the Prospectus, and such websites and (other than information expressly incorporated by reference herein) information do not form part of this Supplementary Prospectus or the Prospectus.