The board of directors of the China Oilfield Services Limited announced that Mr. Sun Weizhou (Mr. Sun) and Ms. Ng Sau Mei (Ms. Ng) have been appointed as the joint company secretaries (the Joint Company Secretaries, each a Joint Company Secretary) of the Company with effect from 21 January 2022. From January 2015 to December 2021, Mr. Sun Weizhou served as the deputy general manager of COSL-Expro Testing Services (Tianjin) Company Ltd. Since December 2021, he has served as the Party Secretary and the general manager of the Production Optimization Division of COSL. Ms. Ng is a director of the Listing Services Department of TMF Hong Kong Limited, an international corporate services provider.

Ms. Ng has over 20 years of professional experience in the company secretarial industry. The Board further announced that Mr. Sun has also been appointed as an authorised representative of the Company under Rule 3.05 of the Listing Rules; and an authorised representative of the Company under Part 16 of the Companies Ordinance (Chapter 622 of the Laws of Hong Kong), with effect from 21 January 2022.