Edward Yao, principal, equity derivatives trader at Morgan Stanley in Hong Kong, has left the firm. Traders in Hong Kong believe Yao is moving to a local hedge fund. He reported to Stevan Vrcelj, head of derivatives, at Morgan Stanley's Hong Kong office. Vrcelj commented that the bank does not intend to find a replacement but has restructured the trading desk, bringing traders in from the region, declining further comment. Yao could not be reached.