Warning Regarding Unsolicited Articles

Mast Energy Developments PLC

(Incorporated in England and Wales)

(Registration Number: 12886458)

LEI :213800HFVHGJ9YGO9F71

Share code on the LSE: MAST

ISIN: GB00BNG90H86

('MED' or 'the Company')

Dated: 9 September 2025

Mast Energy Developments PLC

("MED" or the "Company")

Warning Regarding Unsolicited and Non-Commissioned Sponsored Articles

MAST Energy Developments PLC announces that it has been made aware of articles recommending the Company and its shares to investors which appear to be "sponsored articles" on websites such as inter alia "Global Gazette", "Guardian Globe" and "UK Finance Pulse". While the Company cannot control third-party content online, MED strongly encourages investors or prospective investors to rely only on official sources of information about the company and/or its projects, available via the LSE's Regulatory News Service ("RNS") and on the RNS Announcements page of the Company's website which can be accessed at the link below, when determining whether or not to make an investment in the Company.

MED website RNS Announcements page link: https://www.med.energy/rnsannoucements

For further information please visit www.med.energy or contact: