China's Shanghai Composite Index opened down 12.55 points, or 0.32%, at 3891.18 on Friday, August 21. The Shenzhen Component Index opened down 37.14 points, or 0.27%, at 13935.64. The CSI 300 Index opened down 7.32 points, or 0.16%, at 4585.44. The ChiNext Index opened down 0.48 points, or 0.01%, at 3495.11. The STAR Market 50 Index opened down 3.69 points, or 0.22%, at 1649.28.