Announcement PDF ASX: HRZ ASX ANNOUNCEMENT 4 SEPTEMBER 2025 APPOINTMENT OF COMPANY SECRETARY AND MANAGEMENT UPDATE Horizon Minerals Limited (ASX: HRZ) (“Horizon” or “the Company”) advises that Mr Daniel Coletta has been appointed as Company Secretary. Mr Coletta is responsible for communication with the ASX in relation to listing rule matters for the purpose of ASX Listing Rule 12.6. This notice is given for the purpose of ASX Listing Rule 3.16.1. Chief Financial Officer (“CFO”) and Company Secretary, Mr Julian Tambyrajah, has left the Company. The Company will shortly commence a formal process to appoint a new CFO. Mr Tambyrajah served in his role for five years and the Company thanks him for his efforts. Authorised for release by the Board of Directors For further information, please contact: Grant Haywood Managing Director and CEO Tel: +61 8 9386 9534 grant.haywood@horizonminerals.com.au Level 2, 16 Ord Street West Perth WA 6005 PO Box 1064 West Perth WA 6872 Michael Vaughan Media Relations – Fivemark Partners Tel: +61 422 602 720 michael.vaughan@fivemark.com.au T: +61 8 9386 9534 E: info@horizonminerals.com.au horizonminerals.com.au ACN 007 761 186 ABN 88 007 761 186