The Shangai Composite Index gained 0.1 points or 0.00 percent on Thursday to close at 3941 points. Gains were led by Sanan Optoelectron (9.98%), Poly Real Estate (4.72%) and Hengli Petrochemical (4.46%). Biggest losers were Agricultural Bank of China (-2.27%), Bank Of China (-2.25%) and Aisino (-1.87%).