Announcement PDF Form 604 Corporations Act 2001 Section 671B Notice of change of interests of substantial holder To Company Name/Scheme HORIZON GOLD LIMITED ACN/ARSN ABN 27 614 175 923 1. Details of substantial holder (1) Name Zeta Resources Limited (and associates as listed in Annexure B) ACN/ARSN (if applicable) There was a change in the interests of the substantial holder on 12 March 2026 The previous notice was given to the company on 26 August 2025 The previous notice was dated 26 August 2025 2. Previous and present voting power The total number of votes attached to all the voting shares in the company or voting interests in the scheme that the substantial holder or an associate (2) had a relevant interest (3) in when last required, and when now required, to give a substantial holding notice to the company or scheme, are as follows: Class of securities (4) Previous notice Present notice Person’s votes Voting power (5) Person’s votes Voting power (5) Ordinary Shares 118,849,522 69.63% 120,532,502 64.69% 3. Changes in relevant interests Particulars of each change in, or change in the nature of, a relevant interest of the substantial holder or an associate in voting securities of the company or scheme, since the substantial holder was last required to give a substantial holding notice to the company or scheme are as follows: Date of change Person whose relevant interest changed Nature of change (6) Consideration given in relation to change (7) Class and number of securities affected Person's votes affected See Annexure A 4. Present relevant interests Particulars of each relevant interest of the substantial holder in voting securities after the change are as follows: Holder of relevant interest Registered holder of securities Person entitled to be registered as holder (8) Nature of relevant interest (6) Class and number of securities Person's votes See Annexure B 5. Changes in association The persons who have become associates (2) of, ceased to be associates of, or have changed the nature of their association (9) with, the substantial holder in relation to voting interests in the company or scheme are as follows: Name and ACN/ARSN (if applicable) Nature of association N/A N/A 6. Addresses The addresses of persons named in this form are as follows: Name Address Zeta Resources Limited Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda Ingot Capital Investments Pty Ltd, Capel Court Unit 2,Level 1,278-824 Sussex Street, Sydney, Australia, NSW, 2000 ICM NZ Limited Level 10, Resimac House, 45 Johnston Street, Wellington, New Zealand ICM Investment Management Limited The Cottage, Ridge Court, The Ridge, Epsom, Surrey, KT18 7EP ICM Limited (and other associates as listed in Annexure B) 34 Bermudiana Road, Hamilton HM11, Bermuda Signature print name Ricardo Gouveia capacity Notifications Administrator sign here date 16 March 2026 Annexure 'A' This is Annexure A of 1 page referred to in Form 604 Notice of change of interests of substantial holder signed by me and dated 12 March 2026. Print Name Ricardo Gouveia Capacity Notifications Administrator Signature Date 16 March 2026 Change in relevant interests Date of change Person whose relevant interest changed Nature of change (6) Consideration given in relation to change (7) Class and number of securities affected Person's votes affected 12 March 2026 Zeta Resources Limited Change in % holding due to on- market purchase of shares by Zeta Resources Limited and dilution of voting power due to the issue of new fully paid ordinary shares by Horizon Gold Limited. No shares were acquired or disposed of by the substantial holder. 1,181,445 1,682,980 1,682,980 12 March 2026 UIL Limited Ingot Capital Investments Pty Ltd Capel Court Pty Ltd ICM NZ Limited ICM Limited ICM Investment Management Limited General Provincial Life Pension Fund Limited Somers Isles Private Trust Company Limited Duncan Saville Change in % holding due to on- market purchase of shares by Zeta Resources Limited and dilution of voting power due to the issue of new fully paid ordinary shares by Horizon Gold Limited. No shares were acquired or disposed of by the substantial holder. - 1,682,980 1,682,980 Annexure 'B' This is Annexure B of 2 pages referred to in Form 604 Notice of change of interests of substantial holder signed by me and dated 12 March 2026. Print Name Ricardo Gouveia Capacity Notifications Administrator Signature Date 16 March 2026 Present relevant interests Holder of relevant interest Registered holder of securities Person entitled to be registered as holder (8) Nature of relevant interest (6) Class and number of securities Person's votes Zeta Resources Limited JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Beneficial Owner 120,532,502 ordinary shares 120,532,502 ICM Limited JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under sections 608(1)(b) and (c) and 608(3)(a) of the Corporations Act as investment manager for Zeta Resources Limited. Relevant interest under section 608(1)(b) and (c) and 608(3)(b) of the Corporations Act as Co-Investment Manager of UIL Limited which has control over Zeta Resources Limited. 120,532,502 ordinary shares 120,532,502 UIL Limited JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(b) of the Corporations Act by having control over Zeta Resources Limited. 120,532,502 ordinary shares 120,532,502 ICM Investment Management Limited JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(1)(b) and (c) and 608(3)(b) of the Corporations Act as Co-Investment Manager of UIL Limited which has control over Zeta Resources Limited. 120,532,502 ordinary shares 120,532,502 Ingot Capital Investments Pty Ltd JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(a) of the Corporations Act which has voting power of above 20% in Zeta Resources Limited. 120,532,502 ordinary shares 120,532,502 Capel Court Pty Ltd JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(a) of the Corporations Act which has voting power of above 20% in Zeta Resources Limited. 120,532,502 ordinary shares 120,532,502 ICM NZ Limited JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(a) of the Corporations Act which has voting power of above 20% in Zeta Resources Limited. 120,532,502 ordinary shares 120,532,502 General Provincial Life Pension Fund Limited JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(b) of the Corporations Act by having control over UIL Limited. 120,532,502 ordinary shares 120,532,502 Somers Isle Private Trust Company JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(b) of the Corporations Act by having control over ICM Limited, ICM Investment Management Limited, and General Provincial Life Pension Fund Limited. 120,532,502 ordinary shares 120,532,502 Duncan Saville JP Morgan Nominees Australia Pty Limited Zeta Resources Limited Relevant interest under section 608(3)(b) of the Corporations Act by having control over ICM Limited ICM Investment Management Limited and having control over Somers Isles Private Trust Limited and Capel Court Pty Ltd. 120,532,502 ordinary shares 120,532,502