Publication of Supplement

Supplement dated 20 November 2025 to the following documents previously published by Nationwide Building Society:

• Registration Document dated 3 July 2025;
• Base Prospectus dated 1 August 2025 prepared in connection with the Nationwide Building Society U.S.$35,000,000,000 European Note Programme;
• Base Prospectus dated 3 July 2025 prepared in connection with the Nationwide Building Society €45,000,000,000 Global Covered Bond Programme unconditionally and irrevocably guaranteed as to payments by Nationwide Covered Bonds LLP, as previously supplemented on 11 August 2025; and
• Base Prospectus dated 3 July 2025 prepared in connection with the Nationwide Building Society U.S.$25,000,000,000 Senior Preferred, Senior Non-Preferred and Subordinated Medium-Term Note Programme.

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UK MiFIR professionals/ECPs only/No UK PRIIPs KID

EU MiFID II professionals/ECPs only/No EEA PRIIPs KID

Please note that the information contained in the Registration Document and the relevant Base Prospectus, as supplemented, may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Registration Document or the relevant Base Prospectus, as supplemented) 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 relevant Base Prospectus is not addressed. Prior to relying on the information contained in the Registration Document and/or the relevant Base Prospectus, as supplemented, you must ascertain from the Registration Document and the relevant Base Prospectus, as supplemented, whether or not you are part of the intended addressees of the information contained therein.

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