Anglesey Mining Plc - Holding(s) in Company

TR-1: Standard form for notification of major holdings NOTIFICATION OF MAJOR HOLDINGS (to be sent to the relevant issuer and to the FCA in Microsoft Word format if possible) i 1a. Identity of Anglesey Mining PLC the issuer or the underlying issuer of existing shares to which voting rights are attached ii: 1b. Please indicate if the issuer is a non-UK issuer (please mark with an "X" if appropriate) Non-UK issuer 2. Reason for the notification (please mark the appropriate box or boxes with an "X") An acquisition or x disposal of voting rights An acquisition or disposal of financial instruments An event changing the breakdown of voting rights Other (please specify) iii: 3. Details of person subject to the notification obligation iv Name YA II PN LTD City and country An exempted company of registered incorporated in the office (if Cayman Islands with applicable) limited liability, whose principal office is at 1012 Springfield Avenue, Mountainside, NJ 07092 USA 4. Full name of shareholder(s) (if different from 3.) v Name City and country of registered office (if applicable) 5. Date on which 13 March 2026 the threshold was crossed or reached vi: 6. Date on which 25 March 2026 issuer notified (DD/MM/YYYY): 7. Total positions of person(s) subject to the notification obligation % of voting % of voting Total of both Total rights rights in % (8.A + number of attached to through 8.B) voting shares financial rights (total instruments held in of 8. A) (total of issuer 8.B 1 + 8.B (8.A + 2) 8.B) vii Resulting 6.43% 0.00 6.43% 4,166,666 situation on the date on which threshold was crossed or reached Position of 0% 0.00 0% previous notification (if applicable) 8. Notified details of the resulting situation on the date on which the threshold was crossed or reached viii A: Voting rights attached to shares Class/type of Number of % of shares voting voting rights ix rights ISIN code (if possible) Direct Indirect Direct Indirect (DTR5.1) (DTR5.2.1) (DTR5.1) (DTR5.2.1) Ordinary 4,166,666 0 6.43% 0 Shares ISIN: GB00BRYPS729 SUBTOTAL 8. A 4,166,666 6.43% B 1: Financial Instruments according to DTR5.3.1R (1) (a) Type of Expiration Exercise/ Number of % of financial date x Conversion voting voting instrument Period xi rights rights that may be acquired if the instrument is exercised/c onverted. SUBTOTAL 0 0.00 8. B 1 B 2: Financial Instruments with similar economic effect according to DTR5.3.1R (1) (b) Type of Expiration Exercise/ Physical Number of voting % of financial date x Conversion or cash rights voting instrument Period xi rights Settlement xii SUBTOTAL 0 0.00 8.B.2 9. Information in relation to the person subject to the notification obligation (please mark the applicable box with an "X") Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer xiii Full chain of x controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entity (please add additional rows as necessary) xiv Name xv % of voting rights if it equals or is % of voting Total of higher than the notifiable threshold rights both if it through equals or financial is higher instruments than the if it notifiable equals or threshold is higher than the notifiable threshold Yorkville 6.43% 6.43% 6.43% Advisors Global II, LLC (General Partner) Yorkville 6.43% 6.43% 6.43% Advisors Global, LP (Investment Manager) YA II PN, Ltd 6.43% 6.43% 6.43% 10. In case of proxy voting, please identify: Name of the proxy holder The number and % of voting rights held The date until which the voting rights will be held 11. Additional information xvi Yorkville Advisors Global, LP is the Investment Manager of YA II PN Ltd and exercises voting rights on behalf of YA II PN Ltd. Yorkville Advisors Global II, LLC controls Yorkville Advisors Global, LP in its capacity as General Partner. +-------------------+----------------------+ |Place of completion|London, United Kingdom| +-------------------+----------------------+ |Date of completion |25 March 2026 | +-------------------+----------------------+ This information was brought to you by Cision http://news.cision.com