On 28 October 2021, the board of directors of China Oilfield Services Limited received the written resignation from Mr. Xu Yugao, a current non-executive director of the Company. The resignation of Mr. Xu Yugao as a non-executive director of the Company and a member of Remuneration and Assessment Committee of the Board was due to the adjustment of his work arrangement, with effect from the date when a new non-executive director is appointed by the shareholders of the Company at the Extraordinary General Meeting. Mr. Xu Yugao has confirmed that he has no disagreement with the Board and there is no matter that needs to be brought to the attention of the holders of securities of the Company and The Stock Exchange of Hong Kong Limited with regard to his resignation. Mr. Xu Yugao performed his work rigorously, diligently and pragmatically during his tenure as a non-executive director of the Company, and made significant contributions to the development of the Company.