Announcement PDF External Use Authorized 603 page 1/2 15 July 2001 Form 603 Corporations Act 2001 Section 671B Notice of initial substantial holder To Company Name/Scheme Core Lithium Ltd ACN/ARSN 146 287 809 1. Details of substantial holder (1) Name Vanguard Group (The Vanguard Group, Inc. and its controlled entities including those listed in Annexure A) ACN/ARSN (if applicable) N/A The holder became a substantial holder on 21 September 2026 2. Details of 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 on the date the substantial holder became a substantial holder are as follows: Class of securities (4) Number of securities Person’s votes (5) Voting power (6) Ordinary 165,227,510 165,227,510 5.105% 3. Details of relevant interests The nature of the relevant interest the substantial holder or an associate had in the following voting securities on the date the substantial holder became a substantial holder are as follows: Holder of relevant interest Nature of relevant interest (7) Class and number of securities Vanguard Group Vanguard Group is the manager of various Mutual funds and accounts and in that capacity has the power to dispose of the shares. The other members of Vanguard Group have a relevant interest under section 608(3) of the Corporations Act. Ordinary – 165,227,510 4. Details of present registered holders The persons registered as holders of the securities referred to in paragraph 3 above are as follows: Holder of relevant interest Registered holder of securities Person entitled to be registered as holder (8) Class and number of securities Vanguard Group Brown Brothers Harriman Various funds and other accounts of Vanguard Group Ordinary – 40,768 Vanguard Group BNY Mellon Various funds and other accounts of Vanguard Group Ordinary – 13,766,981 Vanguard Group JP Morgan Chase Bank, N.A. Various funds and other accounts of Vanguard Group Ordinary – 118,631,436 Vanguard Group State Street Bank and Trust Company Various funds and other accounts of Vanguard Group Ordinary – 32,788,325 External Use Authorized 603 page 2/2 15 July 2001 5. Consideration The consideration paid for each relevant interest referred to in paragraph 3 above, and acquired in the four months prior to the day that the substantial holder became a substantial holder is as follows: Holder of relevant interest Date of acquisition Consideration (9) Class and number of securities See Annexure A 6. Associates The reasons the persons named in paragraph 3 above are associates of the substantial holder are as follows: Name and ACN/ARSN (if applicable) Nature of association N/A N/A 7. Addresses The addresses of persons named in this form are as follows: Name Address Vanguard Group P.O. Box 2600, V26 Valley Forge, PA 19482 USA print name Shawn Acker capacity Compliance Manager sign here date 23 September 2026 External Use Authorized DIRECTIONS (1) If there are a number of substantial holders with similar or related 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 7 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 total number of votes attached to all the voting shares in the company or voting interests in the scheme (if any) that the person or an Associate has a relevant interest in. (6) The person’s votes divided by the total votes in the body corporate or scheme multiplied by 100. (7) Include details of: (a) any relevant agreement or other circumstances by which the relevant interest was acquired. 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. (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) Details of the consideration must include any and all benefits, moneys and other, that any person from whom a relevant interest has 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 of its associate in relation to the acquisitions, even if they are not paid directly to the person from whom the relevant interest was acquired. Annexure A To Company Core Lithium Ltd ACN/ARSN 146 287 809 Substantial Holder Name Vanguard Group ACN/ARSN N/A Date of change Person whose relevant interest changed Nature of Change(6) Consideration given in relation to change(7) Class Number of securities affected Person's votes affected 19-Jun-2026 The Vanguard Group, Inc. BUY 0.30 Ordinary 2,967,300 2,967,300 19-Jun-2026 The Vanguard Group, Inc. BUY 0.30 Ordinary 2,190,382 2,190,382 19-Jun-2026 The Vanguard Group, Inc. BUY 0.30 Ordinary 4,215,716 4,215,716 19-Jun-2026 The Vanguard Group, Inc. BUY 0.30 Ordinary 474,766 474,766 19-Jun-2026 The Vanguard Group, Inc. BUY 0.30 Ordinary 1,483,644 1,483,644 25-Jun-2026 The Vanguard Group, Inc. BUY 0.28 Ordinary 101,249 101,249 01-Jul-2026 The Vanguard Group, Inc. SELL 0.25 Ordinary (8,079,662) (8,079,662) 15-Jul-2026 The Vanguard Group, Inc. BUY 0.26 Ordinary 12,234 12,234 10-Aug-2026 The Vanguard Group, Inc. BUY 0.30 Ordinary 2,262,836 2,262,836 17-Aug-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 116,009 116,009 18-Aug-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 7,944 7,944 18-Aug-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 2,937,771 2,937,771 19-Aug-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 2,012,214 2,012,214 21-Aug-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 75,913 75,913 21-Aug-2026 The Vanguard Group, Inc. SELL 0.38 Ordinary (75,913) (75,913) 26-Aug-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 10,615 10,615 01-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 381,289 381,289 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 1,025,671 1,025,671 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 15,341 15,341 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 1,974,406 1,974,406 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 880,855 880,855 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 25,074 25,074 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 484,264 484,264 18-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 173,610 173,610 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 273,838 273,838 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 179,814 179,814 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 4,564 4,564 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 527,136 527,136 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 711 711 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 35,440 35,440 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 930 930 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 5,968 5,968 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 129,291 129,291 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 235,175 235,175 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 184 184 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 2,792 2,792 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 3,652 3,652 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 240 240 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 403,046 403,046 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 209,375 209,375 21-Sep-2026 The Vanguard Group, Inc. BUY 0.38 Ordinary 98,855 98,855 21-Sep-2026 The Vanguard Group, Inc. BUY 0.37 Ordinary 46,351 46,351 14-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 619,311 619,311 15-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.26 Ordinary 619,311 619,311 16-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.26 Ordinary 774,138 774,138 17-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 1,238,622 1,238,622 20-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 1,548,277 1,548,277 21-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.24 Ordinary 619,311 619,311 22-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 774,138 774,138 23-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.26 Ordinary 619,311 619,311 24-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 1,268,903 1,268,903 27-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 388,210 388,210 28-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 1,109,483 1,109,483 29-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.24 Ordinary 928,967 928,967 30-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.24 Ordinary 928,966 928,966 31-Jul-2026 Vanguard Investments Australia Ltd. BUY 0.24 Ordinary 413,106 413,106 03-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.24 Ordinary 928,966 928,966 04-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.25 Ordinary 537,925 537,925 05-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.27 Ordinary 928,966 928,966 06-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.26 Ordinary 925,042 925,042 10-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.30 Ordinary 915,482 915,482 # External Use Authorized Annexure A Date of change Person whose relevant interest changed Nature of Change(6) Consideration given in relation to change(7) Class Number of securities affected Person's votes affected 11-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.32 Ordinary 1,238,622 1,238,622 12-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.34 Ordinary 928,966 928,966 13-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.36 Ordinary 928,966 928,966 14-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.35 Ordinary 928,966 928,966 17-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.36 Ordinary 435,756 435,756 18-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.38 Ordinary 928,966 928,966 19-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 928,966 928,966 20-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 928,966 928,966 21-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 928,966 928,966 24-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.38 Ordinary 1,238,622 1,238,622 26-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.38 Ordinary 928,966 928,966 27-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 619,311 619,311 31-Aug-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 480,276 480,276 01-Sep-2026 Vanguard Investments Australia Ltd. BUY 0.38 Ordinary 2,786,899 2,786,899 02-Sep-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 647,903 647,903 18-Sep-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 13,056,141 13,056,141 21-Sep-2026 Vanguard Investments Australia Ltd. BUY 0.37 Ordinary 3,485,787 3,485,787 21-Sep-2026 Vanguard Investments Australia Ltd. BUY 0.38 Ordinary 2,665,219 2,665,219 This is Annexure A of 2 pages referred to in Form 603, Notice of initial substantial holder. Signature: Name: Shawn Acker Capacity: Compliance Manager Date: 23-Sep-2026 # External Use Authorized