Group 1 - The Shanghai Stock Exchange and China Securities Index Co., Ltd. announced the optimization of the Shanghai 380 Index and the launch of the Shanghai 580 Index, aimed at providing a richer set of investment targets for the market [1][2] - The Shanghai 380 Index has been in place for over ten years, but its compilation scheme has shown limitations in representativeness, rule uniformity, and sample stability, necessitating updates [1] - The new Shanghai 580 Index will focus on small-cap stocks, addressing the current lack of representation for small market capitalization companies in the existing indices [1] Group 2 - The Shanghai 580 Index will consist of 580 securities selected from the Shanghai market, characterized by smaller market capitalization and better liquidity, reflecting the overall performance of small-cap stocks [2] - Approximately 30%, 40%, 50%, and 60% of the sample weight in the Shanghai 580 Index will come from sectors such as the Sci-Tech Innovation Board, specialized and innovative enterprises, private economy, and emerging industries, highlighting its innovative small-cap attributes [2] - Following the optimization and new issuance, the Shanghai Stock Exchange will have a flagship broad-based index system consisting of the Shanghai 50, Shanghai 180, Shanghai 380, and Shanghai 580, covering 50% of the number of securities and nearly 90% of the market capitalization in the Shanghai market [2]

Core Points - The A-share market's three major indices closed mixed, with the Shanghai 380 Index down 0.25% at 5304.0 points and a trading volume of 88.591 billion yuan [1] - The Shanghai 380 Index has decreased by 6.15% over the past month, increased by 1.25% over the past three months, and has fallen by 1.15% year-to-date [1] - The index is composed of 380 securities selected from the Shanghai Stock Exchange based on criteria such as revenue growth rate, return on equity, trading volume, and total market capitalization [1] Index Composition - The top ten weighted stocks in the Shanghai 380 Index include: Hu Nong Commercial Bank (1.28%), Chifeng Gold (1.21%), Chengdu Bank (1.14%), Yunnan Agricultural Commercial Bank (1.02%), Yutong Bus (0.94%), Rockchip (0.87%), Hengtong Optic-Electric (0.80%), China Software (0.78%), Shengyi Technology (0.74%), and Hongfa Technology (0.72%) [1] - The index is entirely composed of stocks listed on the Shanghai Stock Exchange, with a 100% allocation [1] Industry Breakdown - The industry composition of the Shanghai 380 Index includes: Industrial (26.66%), Information Technology (14.56%), Materials (12.26%), Financials (10.34%), Healthcare (10.20%), Consumer Discretionary (8.46%), Communication Services (4.72%), Energy (3.72%), Consumer Staples (3.55%), Utilities (3.37%), and Real Estate (2.15%) [2] - The index samples are adjusted biannually, with changes implemented on the next trading day following the second Friday of June and December, with a sample adjustment limit of 10% [2] - Special adjustments may occur under certain circumstances, such as when a sample is delisted or undergoes mergers, acquisitions, or splits [2]