Jin Rong Jie·2025-12-18 09:30Group 1 - The Shanghai Composite Index rose by 0.16% to close at 3876.37 points, while the Hang Seng Index increased by 0.12% to 25498.13 points [1] - China Oilfield Services Limited (COSL) has an AH premium of 120.67%, ranking 29th among AH shares [1] - COSL's A-shares closed at 13.78 yuan, with a gain of 1.1%, and its H-shares closed at 6.9 Hong Kong dollars, up by 0.58% [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 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]