At close of trade, the benchmark Shanghai Composite Index was up by 0.21%, or 6.72 points, to 3,259.96. The Shenzhen Composite Index, which tracks stocks on China's second exchange, added 0.97%, or 21.24 points, to 2,202.49. The blue-chip CSI300 index was up 0.45%, or 18.58 points, to 4,188.68.