Jin Rong Jie·2025-08-21 08:46Group 1 - The Shanghai Composite Index rose by 0.13% to close at 3771.1 points, while the Hang Seng Index fell by 0.24% to 25104.61 points [1] - China Oilfield Services Limited (COSL) has an AH premium of 110.56%, ranking 22nd among AH shares [1] - COSL's A-shares closed at 14.49 yuan, up 2.77%, and H-shares closed at 7.49 HKD, up 4.61% [1] Group 2 - COSL is a major integrated oilfield service provider globally, offering services across all stages of offshore oil and gas exploration, development, and production [1] - The company's services are categorized into four main types: geophysical exploration services, drilling services, oilfield technical services, and marine services [1] - COSL was publicly listed on the Hong Kong Stock Exchange on November 20, 2002, and has been trading in the U.S. OTC market since March 26, 2004, and on the Shanghai Stock Exchange since September 28, 2007 [1]