(Yicai Global) Aug. 4 -- China's mainland stock markets began the day lower this morning as investors secured their profits caused by stock price surges accumulated over recent months.

The Shanghai Composite Index opened 0.47 percent lower at 3,370.59. The Nasdaq-style Star Market Board 50 Index slid 0.76 percent to 1,561.86.

The Shenzhen Component Index stood at 13,813.76, down 0.36 percent. The ChiNext Price Index, which tracks growth enterprises in Shenzhen, fell 0.26 percent to 2,807.10.

Editor: Emmi Laine