ANNOUNCEMENT ON THE UNLOCKING OF THE FIRST UNLOCKING PERIOD UNDER THE FIRST GRANT AND LISTING OF THE 2021 RESTRICTED SHARE INCENTIVE SCHEME OF THE COMPANY

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.ANNOUNCEMENT ON THE UNLOCKING OF THE FIRST UNLOCKING PERIOD UNDER THE FIRST GRANT AND LISTING OF THE 2021 RESTRICTED SHARE INCENTIVE SCHEME OF THE COMPANY References are made to the notice of the 2022 first extraordinary general meeting the notice of the 2022 first class meeting for A Shareholders and the notice of the 2022 first class meeting for H Shareholders dated 28 January 2022 the circular dated 28January 2022 the supplemental circular dated 7 March 2022 (the “SupplementalCircular”) the announcement dated 6 April 2022 in relation to the adjustment to the proposed adoption of the 2021 Restricted Share Incentive Scheme the announcement dated 21 April 2022 in relation to the SASAC’s approval for the 2021 Restricted Share Incentive Scheme the announcement dated 26 April 2022 in relation to the consideration and approval of the 2021 Restricted Share Incentive Scheme at the 2022 first extraordinary general meeting the 2022 first class meeting for A Shareholders and the 2022 first class meeting for H Shareholders the announcements both dated 25 May 2022 in relation to the relevant matters on the adjustment to the 2021 Restricted Share Incentive Scheme and the First Grant of Restricted A Shares to Participants the announcement dated 14 June 2022 in relation to the results of the First Grant under the 2021 Restricted Share Incentive Scheme the announcement dated 24 November 2022 in relation to the proposed grant of reserved Restricted Shares to Participants the announcement dated 27 December 2022 in relation to the results of the reserved grant of 2021 Restricted Share Incentive Scheme the announcement dated 23 January 2024 in relation to the implementation of repurchase and cancellation of partial Restricted Shares under equity incentives as well as the announcement dated 3 June 2024 in relation to the satisfaction of the unlocking conditions for the first unlocking period of the Restricted Shares under the First Grant of the 2021 Restricted Share Incentive – 1 –Scheme of Aluminum Corporation of China Limited* (the “Company”). Terms used in this announcement shall have the same meanings as those defined in the Supplemental Circular unless the context requires otherwise.I. ARRANGEMENTS FOR LISTING AND CIRCULATION OF THE RESTRICTED SHARES TO BE UNLOCKED AND CHANGES IN THE SHARE CAPITAL STRUCTURE (I) Date of listing and circulation for Restricted Shares to be unlocked: 20 June 2024; (II) Number of Restricted Shares to be unlocked for listing and circulation: 44392758 shares; (III) Lock-up and transfer restrictions of Restricted Shares held by directors and senior management to be unlocked Among the Participants the directors and senior management of the Company upon the unlocking of the Restricted Shares shall comply with the provisions of relevant laws and regulations such as the Company Lawthe Securities Law of the People’s Republic of China (the “SecuritiesLaw”) and the Administrative Rules Concerning the Holding and Change of Shares held by Directors Supervisors and Senior Management of a Listed Company for their holding and trading of the shares of the Company.(IV) Changes in the share capital structure of the Company after the unlocking of the Restricted Shares The changes in the Company’s shares after the unlocking are as follows: Before the change The change After the change Type (shares) (shares) (shares) Shares subject to sales restrictions (A Shares) 135708277 -44392758 91315519 Shares not subject to sales restrictions (A Shares) 13078706983 44392758 13123099741 H Shares 3943965968 0 3943965968 Total 17158381228 0 17158381228 – 2 –II. CONCLUSION OF THE LEGAL OPINION In the opinion of the lawyers of Jincheng Tongda & Neal Law Firm the Company has obtained the necessary approvals and authorizations for the unlocking of the Restricted Shares. The conditions for the unlocking of the Restricted Shares as stipulated in the Incentive Scheme have been satisfied which is in compliance with the Company Law the Securities Law the Administrative Measures the Guidelines on the Implementation of Equity Incentives for Listed Companies Controlled by Central Enterprises and other laws regulations and regulatory documents as well as the relevant provisions of the Incentive Scheme.By order of the Board Aluminum Corporation of China Limited* Ge Xiaolei Joint Company Secretary Beijing the PRC 14 June 2024 As at the date of this announcement the members of the Board comprise Mr. Dong Jianxiong Mr. Zhu Runzhou Mr. Ou Xiaowu and Mr. Jiang Tao (Executive Directors); Mr. Zhang Jilong and Mr. Chen Pengjun (Non-executive Directors); Mr. Qiu Guanzhou Mr. Yu Jinsong and Ms. Chan Yuen Sau Kelly (Independent Non-executive Directors).* For identification purpose only –3–