A股 重要调整！

Core Viewpoint - Multiple indices in the A-share market are undergoing significant adjustments, with announcements made by the Shanghai and Shenzhen Stock Exchanges regarding changes to sample stocks in various indices, effective in December 2025 [1][2]. Group 1: Index Adjustments - The Shanghai Stock Exchange announced adjustments to the Shanghai 50, Shanghai 180, and Shanghai 380 indices, with changes effective after market close on December 12, 2025 [2]. - The Shanghai 50 index will replace four stocks, adding SAIC Motor, Northern Rare Earth, Huadian New Energy, and Zhongke Shuguang, while removing Poly Developments, China Mobile, China Aluminum, and CRRC [3][4]. - The Sci-Tech Innovation 50 index will replace two stocks, adding Aojie Technology and Shengke Communication, while removing Huaxi Biotechnology and Hangcai Co [4][5]. Group 2: Shenzhen Stock Exchange Adjustments - The Shenzhen Stock Exchange announced sample stock adjustments for the Shenzhen Component Index, ChiNext Index, Shenzhen 100, and ChiNext 50, effective December 15, 2025 [5][7]. - The Shenzhen Component Index will add 17 stocks, including Tuowei Information, Sifang Jingchuang, and Wolong Nuclear Materials, while removing Guoyao Yizhi, Haide Shares, and Tibet Mining [7][9]. - The ChiNext Index will add eight stocks, including Shuanglin Co., Changshan Pharmaceutical, and Changsheng Bearing [9]. Group 3: Zhongzheng Index Adjustments - The Zhongzheng Index Company announced adjustments to the CSI 300, CSI 500, CSI 1000, CSI A50, CSI A100, and CSI A500 indices, effective after market close on December 12, 2025 [13][14]. - The CSI 300 index will replace 11 stocks, adding Huadian New Energy, Shenghong Technology, Shandong Precision, and others, while removing FAW Liberation, Oppein Home, and others [13][14]. - The CSI 500 index will replace 50 stocks, the CSI 1000 index will replace 100 stocks, the CSI A50 index will replace four stocks, the CSI A100 index will replace six stocks, and the CSI A500 index will replace 20 stocks [14].