(1) POLL RESULTS OF THE ANNUAL GENERAL MEETING HELDON 28 JUNE 2024(2) RETIREMENT OF INDEPENDENT NON-EXECUTIVE DIRECTOR ANDCHANGE IN COMPOSITION OF BOARD COMMITTEES

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.SEMICONDUCTOR MANUFACTURING INTERNATIONAL CORPORATION * (Incorporated in the Cayman Islands with limited liability) (Stock Code: 981) (1) POLL RESULTS OF THE ANNUAL GENERAL MEETING HELD ON 28 JUNE 2024 (2) RETIREMENT OF INDEPENDENT NON-EXECUTIVE DIRECTOR AND CHANGE IN COMPOSITION OF BOARD COMMITTEES (1) POLL RESULTS OF THE ANNUAL GENERAL MEETING HELD ON 28 JUNE 2024 The Board is pleased to announce that the proposed resolutions set out in the notice of the AGM were duly passed by the Shareholders by way of poll at the AGM held on 28 June 2024. (2) RETIREMENT OF INDEPENDENT NON-EXECUTIVE DIRECTOR AND CHANGE IN COMPOSITION OF BOARD COMMITTEES The Board hereby announces that Professor Lau Lawrence Juen-Yee has retired as an independent non-executive Director and ceased to be a member of each of the audit committee the compensation committee the nomination committee and the strategic committee of the Board with effect from the conclusion of the AGM. (1) POLL RESULTS OF THE ANNUAL GENERAL MEETING HELD ON 28 JUNE 2024 Reference is made to the circular of the Company dated 6 June 2024 (the “Circular”) in relation to among other things the following: (1) re-election of Directors; (2) re-appointment of auditors; (3) proposal on profit distribution for the year 2023; - 1 -(4) proposed engagement in hedging business; (5) proposed general mandate to issue and repurchase Shares; and (6) notice of the annual general meeting. Unless otherwise specified capitalised terms used herein shall have the same meanings as defined in the Circular.POLL RESULTS OF THE AGM The Board is pleased to announce that the proposed resolutions set out in the notice of the AGM contained in the Circular were duly passed by the Shareholders by way of poll at the AGM held on 28 June 2024.As at the date of the AGM the total number of Shares in issue was 7956207028 Shares (including 5982597856 Hong Kong Shares and 1973609172 RMB Shares).As at the date of the AGM: Number of Shareholders and authorised proxies attending the AGM 163 including: number of Shareholders holding RMB Shares 161 number of Shareholders holding Hong Kong Shares 2 Total number of Shares with voting rights held by Shareholders attending the AGM 2723867890 including: total number of RMB Shares 589067369 total number of Hong Kong Shares 2134800521 Percentage of total number of Shares with voting rights held by Shareholders attending the AGM 34.235760% including: percentage of total number of RMB Shares with voting 7.403872% rights held by Shareholders percentage of total number of Hong Kong Shares with voting rights held by Shareholders 26.831888% As at the date of the AGM the total number of Shares entitling the Shareholders to attend and vote on the resolutions at the AGM was 7956207028 Shares and the number of Shares entitling to abstain from voting in favour of the resolutions as set out in Rule 13.40 of the Hong Kong Listing Rules was nil.- 2 -There was no Share requiring the Shareholders to abstain from voting at the AGM under the Hong Kong Listing Rules. No Shareholder has indicated in the Circular that he/she intends to abstain from voting on or vote against any of the resolutions at the AGM.Computershare Hong Kong Investor Services Limited Hong Kong share registrar of the Company acted as the scrutineer for the vote-taking at the AGM.All Directors of the Company attended the AGM either in person or by electronic means.The poll results in respect of the respective resolutions at the AGM by number of Shares were as follows: No. of Votes (%) ORDINARY RESOLUTIONS FOR AGAINST ABSTAIN 1. To receive and consider the 2023 annual report of the 2723744542 71348 52000 Company (including the audited consolidated financial 99.997381% 0.002619% statements and the reports of the Directors of the Company and the auditors of the Company for the year ended 31 December 2023).As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 2.1 To re-elect Dr. Liu Xunfeng as an executive Director. 2674949212 48869178 49500 98.205858%1.794142% As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 2.2 To re-elect Dr. Chen Shanzhi as a non-executive 2717225351 6591039 51500 Director. 99.758022% 0.241978% As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 2.3 To re-elect Dr. Fan Ren Da Anthony as an independent 2553172671 160702852 9992367 non-executive Director. 94.078474% 5.921526% As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 3. To consider and approve the re-appointment of auditors 2723665042 151348 51500 for the year 2024.# 99.994444% 0.005556% As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 4. To consider and approve the proposal on profit 2723661942 186448 19500 distribution for the year 2023.# 99.993155% 0.006845% As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 5. To consider and approve the engagement in hedging 2723716942 131448 19500 business by the Company and its subsidiaries.# 99.995174% 0.004826% As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed.- 3 -No. of Votes (%) ORDINARY RESOLUTIONS FOR AGAINST ABSTAIN 6. To grant a general mandate to the Board to allot issue 2559500131 154376392 9991367 grant distribute and otherwise deal with additional 94.311591% 5.688409% Common Shares in the Company (including any sale or transfer treasury Hong Kong Shares) not exceeding 20% of the total number of issued Shares of the Company (excluding any treasury Shares) as at the date of this Resolution.# As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 7. To grant a general mandate to the Board to repurchase 2723782942 66448 18500 Hong Kong Shares of the Company not exceeding 10% 99.997561% 0.002439% of the number of issued Hong Kong Shares of the Company (excluding any treasury Shares) as at the date of this Resolution.# As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed. 8. Conditional on the passing of Resolutions 6 and 7 to 2559566231 154310292 9991367 extend the mandate granted to the Board to allot issue 94.314027% 5.685973% grant distribute and otherwise deal with additional Hong Kong Shares of the Company (including any sale or transfer treasury Hong Kong Shares) not exceeding the number of Hong Kong Shares repurchased by the Company under the Resolution 7.# As more than 50% of the votes were cast in favour of the resolution the resolution was duly passed.# The full text of the resolution is set out in the notice of the AGM contained in the Circular. (2) RETIREMENT OF INDEPENDENT NON-EXECUTIVE DIRECTOR AND CHANGE IN COMPOSITION OF BOARD COMMITTEES As disclosed in the Circular Professor Lau Lawrence Juen-Yee (“Professor Lau”) has notified the Board and confirmed that he would not stand for re-election at the AGM. The Board hereby announces that Professor Lau has retired as an independent non-executive Director and ceased to be a member of each of the audit committee the compensation committee the nomination committee and the strategic committee of the Board with effect from the conclusion of the AGM.Professor Lau has confirmed that he has no disagreement with the Board and there are no other matters relating to his retirement that need to be brought to the attention of the Shareholders of the Company.- 4 -Upon the retirement of Professor Lau the number of members of the audit committee fell below the minimum number required under Rule 3.21 of the Hong Kong Listing Rules. The Company will identify a suitable candidate to fill the vacancy in the audit committee as soon as practicable and within three months after the AGM in order to comply with the relevant requirements of the Hong Kong Listing Rules. The Company will make further announcement(s) as and when appropriate.The Board would like to express its gratitude to Professor Lau for his valuable contribution to the Board.By order of the Board Semiconductor Manufacturing International Corporation Company Secretary/Board Secretary Guo Guangli Shanghai PRC 28 June 2024 As at the date of this announcement the Directors of the Company are: Executive Director LIU Xunfeng (Chairman) Non-executive Directors LU Guoqing CHEN Shanzhi YANG Lumin Independent Non-executive Directors FAN Ren Da Anthony LIU Ming WU Hanming * For identification purposes only