A few days ago, Shanghai Stock Exchange and China Securities Index Co., Ltd. announced the adjustment of some index sample stocks. Shanghai Stock Exchange announced the adjustment of sample stocks of the SSE 50 Index, SSE 180 Index, SSE 380 Index, and SSE Dividend Index; China Securities Index Co., Ltd. also announced the adjustment of some sample stocks, such as CSI 300 Index, CSI 100 Index, CSI 500 Index, CSI Dividend Index, and CSI Hong Kong Index. The adjustment will take effect on December 16, 2019. Among them, the CSI 100 Index replaced 4 stocks, AIER Eye Hospital Group, Luxshare and other two stocks were selected into the index.
The CSI 100 Index is composed of the 100 largest stocks in the CSI 300 Index sample. It was officially released on May 29, 2006, which comprehensively reflects a group of large market value companies' overall performance in Shanghai A-stock and Shenzhen A-stock market.