The board of directors of Sinopec Oilfield Service Corporation announced that Mr. Zhang Jinhong (‘Mr. Zhang') has tendered his resignation as the Deputy General Manager of the Company on 29 May 2023 to the Board due to his age. The Board has accepted his resignation with effect from 29 May 2023. Mr. Zhang has confirmed that he has no disagreement with the Board and there are no other matters in relation to his resignation that need to be brought to the attention of the shareholders of the Company.