Shang Hai Zheng Quan Bao·2025-11-29 09:04Core Viewpoint - The announcement from China Securities Index Co., Ltd. regarding the periodic adjustment of sample stocks for various indices, including CSI 300, CSI 500, and CSI 1000, indicates a shift in market composition and sector representation, effective from December 12 and December 15, 2023 [1][21]. Group 1: Index Adjustments - The CSI 300 index will replace 11 sample stocks, including Dongshan Precision, Light Media, and Shenghong Technology [1][4]. - The CSI 500 index will replace 50 sample stocks, with new additions including Heertai, Huahong Semiconductor, and Dongfang Yuhong [4][5]. - The CSI 1000 index will replace 100 sample stocks, with new entries such as Shijia Photon, Yongding Co., and Hailanxin [6][12]. Group 2: Sector Representation - Post-adjustment, sectors such as information technology, communication services, and industrials will see an increase in sample stock numbers and weights, leading to a more balanced industry allocation in the A-series indices compared to traditional broad-based indices [13]. - The total market capitalization coverage for the CSI 300, CSI 500, and CSI 1000 indices is reported at 51.92%, 14.83%, and 13.22% respectively, indicating significant representation of large-cap stocks [13]. Group 3: Specific Stock Changes - The Shanghai Stock Exchange and China Securities Index Co., Ltd. will also adjust the sample stocks for the SSE 50, SSE 180, SSE 380, and Sci-Tech 50 indices, with specific stocks being added and removed [13][14]. - The SSE 50 index will replace 4 stocks, including Northern Rare Earth and Huadian New Energy [14]. - The SSE 180 index will replace 7 stocks, with new additions like Zhongtian Technology and Ruixin Micro [14].