CNOOC Limited announced that with effect from 30 June 2023, Mr. Xia Qinglong ("Mr. Xia") resigned as an Executive Director and the President of the Company due to work commitments. Mr. Xia confirmed that he has no disagreement with the Board in any respect and there is no matter relating to his resignation that needs to be brought to the attention of the shareholders of the Company or The Stock Exchange of Hong Kong Limited. The Board would like to take this opportunity to express its sincere gratitude to Mr. Xia for his contribution and services as the Executive Director and the President of the Company.

The Board further announces that Mr. Zhou Xinhuai ("Mr. Zhou"), an Executive Director and the Chief Executive Officer of the Company, also acts as the President of the Company with effect from 30 June 2023. The biographical details of Mr. Zhou are set out below: Born in 1970, Mr. Zhou is a professor-level senior engineer. He graduated from Chengdu University of Technology with a Master's degree in Coalfield Oil and Gas Geology and Exploration.

In 2008, he received a Ph.D. degree in Energy Geological Engineering from China University of Geosciences. Mr. Zhou has worked with China National Offshore Oil Corporation (the "CNOOC Group") since 1996 holding several positions. From August 2003 to April 2014, he was the project manager and geological chief engineer of the Technology Department of the CNOOC (China) Limited Tianjin Branch, a subsidiary of the Company.

He served as the Chief Geological Engineer of Bohai Oil Research Institute of CNOOC Bohai Petroleum Administrative Bureau, and as the manager of Exploration Department of CNOOC Bohai Petroleum Administrative Bureau and the manager of Exploration Department of CNOOC (China) Limited Tianjin Branch from April 2014 to March 2017. Mr. Zhou served as the Chief Geologist at CNOOC East China Sea Petroleum Administrative Bureau and the Chief Geologist at CNOOC (China) Limited Shanghai Branch, a subsidiary of the Company from March 2017 to October 2019. He also worked as the General Manager of the Exploration Division of the Company from October 2019 to March 2021.

He served as the General Manager of CNOOC (China) Limited Hainan Branch, a subsidiary of the Company, and Chairman and General Manager of Hainan Energy Co. Ltd., from March 2021 to March 2022. He has served as the Deputy General Manager of the CNOOC Group since March 2022.

He has been a Director of Overseas Oil & Gas Corporation Ltd. and CNOOC (BVI) Limited since April 2022. He has been the Chairman of the Board of CNOOC (China) Limited since October 2022. Mr. Zhou was appointed as an Executive Director and the Chief Executive Officer of the Company with effect from 28 April 2022, was appointed as a member of the Strategy and Sustainability Committee of the Company on 25 August 2022, and also acts as the President of the Company with effect from 30 June 2023.