A股重大调整，今日生效！

Core Viewpoint - The periodic adjustment of A-share indices took effect on June 16, 2025, impacting various indices including the Shanghai Stock Exchange 50, 180, 380, and the ChiNext indices, among others [1][3]. Group 1: Index Adjustments - A total of 187 sample stocks were replaced across six major cross-market indices, with the CSI 300 index changing 7 stocks, the CSI 500 changing 50 stocks, and the CSI 1000 changing 100 stocks [3][16]. - The newly added stocks include notable companies such as Softcom Power and AVIC Chengfei [3][20]. Group 2: Sector Representation - The adjustments reflect a shift towards enhancing representation in sectors like information technology, communication services, and industrials, with the CSI 500 index seeing a 1.82% increase in the weight of the information technology sector [16][19]. - The manufacturing sector remains dominant in the Shenzhen Component Index, accounting for 73% of the sample companies, while the ChiNext index emphasizes strategic emerging industries with a weight of 92% [19][20]. Group 3: New Index Launch - The newly launched SSE 580 index focuses on smaller-cap stocks within the Shanghai market, comprising 580 securities that reflect the performance of smaller listed companies [20].