The supervisory committee of Sinopec Oilfield Service Corporation announced that Mr. Zhang Jianbo has tendered his resignation as a supervisor of the Company on 13 February 2023 to the Supervisory Committee since Mr. Zhang has retired due to reaching the statutory retirement age. According to the Articles of Association of the Company, Mr. Zhang's resignation shall take effect upon the submission of the resignation letter to the Supervisory Committee on 13 February 2023.