The Shangai Composite Index dropped 24 points or 0.61 percent on Monday to close at 3881 points. Losses were led by Sanan Optoelectron (-6.09%), Yonyou Soft (-5.40%) and Guangzhou Baiy (-3.87%). Offsetting the fall, top gainers were Sinopec (4.31%), China Coal (3.57%) and Ping An Insurance (3.00%).