The chairman of Kunlun Energy Co., a gas distribution arm of China National Petroleum Corp., resigned amid a widening government anti-corruption campaign that claimed his predecessor four months earlier. Its shares declined. Wen Qingshan quit with immediate effect as both chairman and director of the company due to personal matters, Kunlun said in a statement to the Hong Kong stock exchange yesterday. Executive Director Zhang Bowen will assume the chairman’s duties, it said. China’s Caixin magazine reported on Dec. 16 that Wen is helping in a government graft probe. Wen was taken into custody to assist with an investigation, a person with knowledge of the matter said yesterday, asking not to be identified as he wasn’t authorized to speak publicly about it. Kunlun slumped to a one-month low in Hong Kong today, after its New York-traded stock plunged 16 percent. Wen’s resignation follows government investigations into five other officials […]