Jin Rong Jie·2025-08-13 08:55Group 1 - The Shanghai Composite Index rose by 0.48% to close at 3683.46 points, while the Hang Seng Index increased by 2.58% to 25613.67 points [1] - China Oilfield Services Limited (COSL) has an AH premium of 112.57%, ranking 19th among AH stocks in terms of premium rate [1] - COSL's A-shares closed at 14.01 yuan, remaining flat, while its H-shares closed at 7.21 Hong Kong dollars, up by 0.14% [1] Group 2 - COSL is recognized as a large-scale integrated oilfield service provider globally, offering services across all stages of offshore oil and gas exploration, development, and production [1] - The company's business is divided into four main categories: 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 began trading on the Shanghai Stock Exchange on September 28, 2007 [1]