Announcement PDF Form 604 Corporations Act 2001 Section 671B Notice of change of interests of substantial holder To Company Name/Scheme Hillgrove Resources Limited (ASX:HGO) ACN/ARSN 004 297 116 1. Details of substantial holder(1) Name The companies and partnerships listed in Annexure “A” (“Substantial Holder Group”) ACN/ARSN (if applicable) There was a change in the interests of the substantial holder on 20/04/2026 The previous notice was given to the company on 10/10/2025 The previous notice was dated 10/10/2025 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: Substantial Holder Group Class of securities (4) Previous notice Present notice Person’s votes Voting power (5) Person’s votes Voting power (5) Ordinary Shares 242,856,954 7.40% 210,351,201 6.16% 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: See Annexure B 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 Portfolio Services Pty Limited Portfolio Services Pty Limited Portfolio Services Pty Limited Portfolio Services Pty Limited has a relevant interest under section 608(1)(a) of the Act, as the registered holder of the securities. 210,351,201 ordinary shares 6.16% Ariadne Holdings Pty Limited Portfolio Services Pty Limited Portfolio Services Pty Limited Ariadne Holdings Pty Limited has a relevant interest under section 608(3)(b) of the Act, as Portfolio Services Pty Limited is a wholly owned subsidiary and therefore controlled by Ariadne Holdings Pty Limited. 210,351,201 ordinary shares 6.16% 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 Ariadne Australia Limited Portfolio Services Pty Limited Portfolio Services Pty Limited Ariadne Australia Limited has a relevant interest under section 608(3)(b) of the Act, as Portfolio Services Pty Limited is a wholly owned subsidiary and therefore controlled by Ariadne Australia Limited. 210,351,201 ordinary shares 6.16% 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 6. Addresses The addresses of persons named in this form are as follows: Name Address Ariadne Australia Limited Level 19, 2 Chifley Square, Sydney NSW 2000 Ariadne Holdings Pty Limited Level 19, 2 Chifley Square, Sydney NSW 2000 Portfolio Services Pty Limited Level 19, 2 Chifley Square, Sydney NSW 2000 Signature print name Natt McMahon capacity Company Secretary – Ariadne Australia Limited ______________________________________________________________________________________ sign here date 22/04/2026 _______________________________________________________ DIRECTIONS (1) If there are a number of substantial holders with similar or related relevant interests (eg. a corporation and its related corporations, or the manager and trustee of an equity trust), the names could be included in an annexure to the form. If the relevant interests of a group of persons are essentially similar, they may be referred to throughout the form as a specifically named group if the membership of each group, with the names and addresses of members is clearly set out in paragraph 6 of the form. (2) See the definition of "associate" in section 9 of the Corporations Act 2001. (3) See the definition of "relevant interest" in sections 608 and 671B(7) of the Corporations Act 2001. (4) The voting shares of a company constitute one class unless divided into separate classes. (5) The person’s votes divided by the total votes in the body corporate or scheme multiplied by 100. (6) Include details of: (a) any relevant agreement or other circumstances because of which the change in relevant interest occurred. If subsection 671B(4) applies, a copy of any document setting out the terms of any relevant agreement, and a statement by the person giving full and accurate details of any contract, scheme or arrangement, must accompany this form, together with a written statement certifying this contract, scheme or arrangement; and (b) any qualification of the power of a person to exercise, control the exercise of, or influence the exercise of, the voting powers or disposal of the securities to which the relevant interest relates (indicating clearly the particular securities to which the qualification applies). See the definition of "relevant agreement" in section 9 of the Corporations Act 2001. (7) Details of the consideration must include any and all benefits, money and other, that any person from whom a relevant interest was acquired has, or may, become entitled to receive in relation to that acquisition. Details must be included even if the benefit is conditional on the happening or not of a contingency. Details must be included of any benefit paid on behalf of the substantial holder or its associate in relation to the acquisitions, even if they are not paid directly to the person from whom the relevant interest was acquired. (8) If the substantial holder is unable to determine the identity of the person (eg. if the relevant interest arises because of an option) write "unknown". (9) Give details, if appropriate, of the present association and any change in that association since the last substantial holding notice. Annexure A to form 604 This is Annexure A of 1 page referred to in ASIC form 604 (Notice of change of interests of substantial holder), for Hillgrove Resources Limited ACN 004 297 116 Sign here: _________________________ Print name: Natt McMahon Date: 22/04/2026 Ariadne Australia Limited, ACN 010 474 067 Ariadne Holdings Pty Limited, ACN 008 460 357 Portfolio Services Pty Limited, ACN 010 565 670 Annexure B to form 604 This is Annexure B of 1 page referred to in ASIC form 604 (Notice of change of interests of substantial holder), for Hillgrove Resources Limited ACN 004 297 116 Sign here: _________________________ Print name: Natt McMahon Date: 22/04/2026 Holder of Relevant Interest Transaction Type Date No. Shares Consideration Portfolio Services Pty Ltd On market sale 19/12/2025 3,500,000 $137,000 Portfolio Services Pty Ltd On market sale 22/12/2025 3,505,753 $139,280 Portfolio Services Pty Ltd On market sale 29/12/2025 4,000,000 $189,966 Portfolio Services Pty Ltd On market sale 02/01/2026 1,500,000 $73,500 Portfolio Services Pty Ltd On market sale 06/01/2026 5,000,000 $260,670 Portfolio Services Pty Ltd On market sale 15/01/2026 5,000,000 $280,410 Portfolio Services Pty Ltd Off market purchase 29/01/2026 2,500,000 $235,702 Portfolio Services Pty Ltd On market sale 09/02/2026 2,500,000 $126,480 Portfolio Services Pty Ltd On market sale 20/04/2026 10,000,000 $410,000 Hillgrove Resources Limited also issued shares on 1 December 2025 as part of a recent capital raising, increasing the number of ordinary shares on issue to 3,414,092,137 and reducing the Substantial Holder Group’s interest to 6.16%. The above transactions have resulted in a corresponding change in the relevant interests of each of Ariadne Australia Limited, Ariadne Holdings Pty Limited, and Portfolio Services Pty Limited the nature of which is as set out in section 4.