Quantum Data Energy PLC

(Incorporated in England and Wales)

(Registration Number: 12886458)

LEI :213800HFVHGJ9YGO9F71

Share code on the LSE: MAST

ISIN: GB00BNG90H86

Dated: 26 February 2026

Quantum Data Energy PLC

("Quantum", "QDE" or the "Company")

Change of Share Ticker (TIDM)

London, UK - Quantum Data Energy PLC (LSE: MAST) is pleased to announce that in order to complete the Company's recent rebranding and name change as announced on 3 November 2025, the Company's share ticker (TIDM) will be amended to "QDE" with effect from 8.00 a.m. on 27 February 2026. Trading in the Company's shares under the new TIDM "QDE" is expected to commence at 8.00 a.m. on 27 February 2026. The Company's ISIN and SEDOL remain unchanged. Existing share certificates should be retained and will remain valid.

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About Quantum Data Energy PLC:

Quantum Data Energy PLC (LSE: MAST) is a UK-based developer, operator and owner of flexible generation power assets. The Company delivers flexible, modular power solutions to the UK grid and AI datacentres worldwide, enabling scalable, reliable energy for next-generation digital infrastructure. The Company has deep expertise in infrastructure planning, grid access, gas access, and efficient power supply. Its new AI power supply strategy is intended to position Quantum as a leading AI infrastructure platform on the London Stock Exchange.

ENDS

This announcement contains inside information for the purposes of the UK version of the Market Abuse Regulation (EU No. 596/2014) as it forms part of United Kingdom domestic law by virtue of the European Union (Withdrawal) Act 2018 ('UK MAR'). Upon the publication of this announcement, this inside information is now considered to be in the public domain.