Shares in Guotai Junan International dived Monday after the major Chinese brokerage said it could not find its Hong Kong chief, at a time when Beijing is targeting the financial sector in an anti-graft campaign. Shares in the Hong Kong-listed firm, a subsidiary of Guotai Junan Securities, dropped more than 15 percent at one point after the company said it had not been able to locate its chairman Yim Fung since Wednesday. "The company has been unable to reach Dr. Yim Fung, Chairman of the Board... since 18 November 2015," the company said in a statement filed to the stock exchange. "Dr. Yim currently cannot ... (full story)