Recently, China Oilfield Services Limited ("COSL" or the "Company") received a notice from Hang Seng Indexes Company Limited. With its outstanding performance in environment, social and corporate governance, the Company was selected as a constituent member of the following indexes, the Hang Seng (China A) Corporate Sustainability Benchmark Index, the Hang Seng Corporate Sustainability Benchmark Index, the Hang Seng (China A) Corporate Sustainability Index and the Hang Seng (Mainland and HK) Corporate Sustainability Index. The Company's ability to be simultaneously selected into four index indicates that the capital market fully recognizes the Company's operating performance and development prospects.

The Hang Seng Corporate Sustainability Index Series carry major influence in the Hong Kong capital market. Reviewed once a year, it includes the most outstanding Hong Kong and Mainland listed companies in sustainable development. The selection process is rigorous and the core factors of the evaluation comprise the company's market value, corporate governance, environment, fair operation practices, etc.

In recent years, COSL has pursued high-quality development through reform and innovation, actively seeking development opportunities while continuously improving its ability to withstand risks. With the continuous increase in scientific research investment, the output speed and quality of scientific and technological achievements have increased significantly. With its continues development, COSL firmly fulfills its corporate social responsibility and actively seeks breakthroughs in sustainable development to create higher-value returns for the society and investors. The Company strictly executes its information disclosure obligations, strengthens voluntary information disclosure, pays great attention to investor interests, continues to maintain compliance and effective communication and shares development results with investors.