Update | Guotai Junan shares surge after missing chairman Yim Fung returns
Guotai Junan International says chairman was ‘assisting’ investigators

The missing chief executive of Guotai Junan International, who disappeared last month in mysterious circumstances, has returned to work after “assisting” authorities in an investigation, the company said in a filing to the Hong Kong stock exchange on Wednesday.
Yim Fung, 52, chairman and chief executive office of the Hong Kong-based firm, “had been assisting in certain investigations [in his personal capacity] carried out by mainland authorities when he was unable to be reached,” the statement said, referring to his disappearance last month.
Shares of Guotai Junan International, the overseas arm of Chinese broker Guotai Junan Securities, surged 8.1 per cent to close at HK$2.82 in Hong Kong.
Neither Yim himself nor the company was the subject of the investigation, the company said, without elaborating on the details of the probe.
Yim will resume his duties as chairman and chief executive officer from Wednesday, it added.
It is the first time Guotai Junan International has given an official explanation on Yim’s disappearance since November 23, when it announced they were unable to contact Yim.