Publication of a Supplementary Prospectus

National Gas Transmission PLC

23 July 2026

RNS Number: 6380N

National Gas Transmission PLC

23 July 2026

Publication of Supplementary Prospectus

The following Supplementary Prospectus has been approved by the Financial Conduct Authority and is available for viewing:

The Supplementary Prospectus dated 23 July 2026 (the "Supplementary Prospectus") supplementing the prospectus dated 16 December 2025, relating to a Euro 10,000,000,000 Euro Medium Term Note Programme of National Gas Transmission PLC.

To view the Supplementary Prospectus, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/6380N_1-2026-7-23.pdf

A copy of the Supplementary Prospectus has been submitted to the Financial Conduct Authority via the National Storage Mechanism and will shortly be available to the public for inspection at: https://data.fca.org.uk/#/nsm/nationalstoragemechanism

For further information, please contact:

Anh Duong, Head of Treasury and Pensions                  +44 (0) 7590 250 650

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