BEIJING, Feb. 23 (Xinhua) -- The ChiNext Index, tracking China's NASDAQ-style board of growth enterprises, lost 0.84 percent to end at 1,663.71 points in the morning session Friday.

The ChiNext Index, together with the Shenzhen Component Index and the Shenzhen SME (small and .medium-sized enterprises) Board Index, are major indices reflecting the performance of stocks listed on the Shenzhen Stock Exchange.

The ChiNext Board, which started trading on Oct. 30, 2009, mainly lists hi-tech companies and those with high growth potential.