A股，重要调整！

Group 1 - Multiple important indices in the A-share market are undergoing significant adjustments, with announcements made by the Shanghai and Shenzhen Stock Exchanges regarding changes to the sample stocks of indices such as the SSE 50, STAR 50, Shenzhen Component Index, and ChiNext Index [2][4] - The SSE 50 Index will replace 4 sample stocks, including the addition of SAIC Motor, Northern Rare Earth, Huadian New Energy, and Zhongke Shuguang, while Poly Developments, China Mobile, China Aluminum, and CRRC will be removed [4][5] - The STAR 50 Index will see 2 stocks replaced, with Aojie Technology and Shengke Communication being added, and Huaxi Biology and Hangcai Co. being removed [5][6] Group 2 - The Shenzhen Stock Exchange announced adjustments to the Shenzhen Component Index, ChiNext Index, Shenzhen 100, and ChiNext 50, effective December 15, 2025, with 17 new stocks including Tuowei Information, Sifang Precision, and Wolong Nuclear Materials being added [6][7] - The ChiNext Index will add 8 stocks, including Shuanglin Co. and Changshan Pharmaceutical [9] - The Shenzhen 100 Index will add 7 sample stocks, while the ChiNext 50 Index will replace 5 stocks [10] Group 3 - On November 28, the China Securities Index Co. announced adjustments to indices such as the CSI 300, CSI 500, CSI 1000, CSI A50, CSI A100, and CSI A500, with changes effective after the market closes on December 12, 2025 [12][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 [14][15] - The CSI 500 Index will replace 50 stocks, the CSI 1000 Index will replace 100 stocks, the CSI A50 Index will replace 4 stocks, the CSI A100 Index will replace 6 stocks, and the CSI A500 Index will replace 20 stocks [15]