A股，重大调整！

Group 1 - The China Securities Index Company announced adjustments to various indices including CSI 300, CSI 500, CSI 1000, and others, effective from June 16, following the market close on June 13 [1][3] - The CSI 300 index will replace 7 constituents, with companies like Softcom and AVIC Changfei being added [1] - The CSI 500 index will replace 50 constituents, including companies such as Hengxuan Technology and BeiGene [1] - The CSI 1000 index will replace 100 constituents, with additions like Wancheng Group and Sirepu [1] - Other indices such as CSI A50, CSI A100, and CSI A500 will also see changes in their constituent stocks [1] Group 2 - The rolling price-to-earnings ratios for the adjusted indices as of May 28 are as follows: CSI 300 at 12.26, CSI 500 at 21.38, CSI 1000 at 25.46, CSI A50 at 16.48, CSI A100 at 13.89, and CSI A500 at 13.50 [3] - The Shanghai Stock Exchange and the China Securities Index Company announced the introduction of the SSE 580 index, set to launch on June 16, 2025, to provide a broader range of investment options [5] - The SSE 580 index will consist of 580 securities selected from the Shanghai market, focusing on smaller market capitalization and higher liquidity stocks [5] - The SSE 580 index will complement existing indices such as SSE 50, SSE 180, and SSE 380, reflecting the overall performance of smaller listed companies in the Shanghai market [5]