Announcement PDF 15 September 2023 CHANGE OF REGISTRY ADDRESS NOTIFICATION Horizon Gold Limited (ASX Code: HRN) (“Horizon” or “Company”) advises in accordance with ASX Listing Rule 3.15.1 and with effect from commencement of business on Monday, 18 September 2023, the Perth office of Computershare Investor Services Pty Limited is moving to: Level 17 221 St Georges Terrace Perth WA 6000 Telephone numbers and postal address remain unchanged. Lodgement of documentation by member organisations, securityholders and other parties must be made at the new address from Monday, 18 September 2023. This announcement has been authorised by the Board of Horizon. For further information please contact: Leigh Ryan Managing Director Perth, Western Australia + 61 8 6331 6092 lryan@horizongold.com.au 1 Horizon Gold Limited ACN: 614 175 923 Suite 8, Level 3, 47 Havelock Street, West Perth WA 6005 | PO Box 39, West Perth WA 6872 Telephone: +61 8 6331 6092 | Email: info@horizongold.com.au | Website: www.horizongold.com.au