China Oilfield Services to announce third quarter 2025 results

China Oilfield Services Limited ("COSL") will publish its 2025 third-quarter results on the Hong Kong Stock Exchange website (https://www.hkexnews.hk) on October 29, 2025. This will be followed by a results presentation and telephone conference on Thursday, October 30, 2025, from 16:30 to 17:30, to discuss key issues and allow for investor questions. Relevant management personnel will attend the presentation.

Investors wishing to participate in the telephone conference can call China Mainland: 4008 063 263, or Hong Kong, China: (852) 3018 3602. To obtain the dial-in password, contact SPRG_COSL@sprg.com.hk or call (852) 2864 4890, (852) 2114 2825, or (852) 2864 4894. Questions can be submitted via email to cosl@cosl.com.cn before 23:59 on Friday, October 24, 2025.

The announcement was made by order of the board, signed by company secretary Sun Weizhou, on October 15, 2025. The executive directors include Messrs. Zhao Shunqiang (chairman), Lu Tao, and Xiao Jia, with non-executive directors Messrs. Fan Baitao and Liu Qiudong, and independent non-executive directors Ms. Chiu Lai Kuen, Susanna, Messrs. Kwok Lam Kwong, Larry, and Yao Xin.