HONG KONG – The chill of a wide-ranging anti-corruption campaign in China that has led to some very high-profile arrests spread with news that Guo Guangchang, the chairman of Fosun International Ltd., may have been snared in a corruption investigation. Shares of its subsidiary, Fosun Pharmaceutical Group Co. Ltd. (HKEX:2196, SS:600196), plunged more than 12 percent Monday on the Hong Kong stock exchange and about 4 percent in Shanghai.