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

THIS NOTICE CONTAINS IMPORTANT INFORMATION OF INTEREST TO THE REGISTERED AND BENEFICIAL OWNERS OF THE NOTES (AS DEFINED BELOW).

If you are in any doubt as to the action you should take, you are recommended to seek your own financial advice immediately from your stockbroker, bank manager, solicitor, accountant or other financial adviser authorised under the Financial Services and Markets Act 2000 (if you are in the United Kingdom), or from another appropriately authorised independent financial adviser and such other professional advice from your own professional advisors as you deem necessary.

ECONOMIC MASTER ISSUER PLC

(LEI: 635400KXONN4J3OEOG29)

Residential Mortgage-Backed Note Programme

Publication of Supplementary Prospectus

London, 5 June 2026

Economic Master Issuer PLC (the "Issuer") hereby notifies Noteholders of the publication of a supplementary prospectus which supplements the base prospectus dated 18 December 2025 (the "Supplementary Prospectus") in respect of the Issuer's residential mortgage-backed note programme (the "Programme") established on 31 July 2020 (as updated from time to time).

The Supplementary Prospectus has been approved by the Financial Conduct Authority on 5 June 2025. To view the Supplementary Prospectus, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/2529H_1-2026-6-5.pdf

A copy of the Supplementary Prospectus has been submitted to the National Storage Mechanism and will be shortly available for inspection (subject to securities laws) at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

For reference, the ISINs of the outstanding Notes are as follows: Series 2020-1 Class A2 Notes ISIN: XS2206912920; Series 2021-1 Class A Notes (Regulation S) ISIN: XS2347638574; Series 2021-1 Class A Notes (Rule 144A) ISIN: XS2347637840; Series 2023-1 Class A Notes ISIN: XS2545262235; Series 2023-2 Class A Notes ISIN: XS2710130605; Series 2024-1 Class A Notes ISIN: XS2856907063; and Series 2025-1 Class A Notes ISIN: XS3083792302.

For enquiries, please contact:

Economic Master Issuer plc

10th Floor

5 Churchill Place

London

E14 5HU

Email: [email protected]