A股午评：三大指数集体调整，沪指跌0.16%创业板指跌0.37%，北证50涨0.93%，有机硅等化工板块逆势大涨！超2800股下跌，成交12662亿缩量716亿

Market Overview - The three major A-share indices collectively adjusted, with the Shanghai Composite Index down 0.16% at 4001.24 points, the Shenzhen Component Index down 0.16%, and the ChiNext Index down 0.37% [1][2] - The total trading volume in the Shanghai and Shenzhen markets was 12,662 billion yuan, a decrease of 716 billion yuan compared to the previous day, with over 2,800 stocks declining [1][2] Sector Performance - The organic silicon sector surged due to the dual impact of polysilicon stockpiling and industry anti-involution news [1] - The fluorochemical, Hainan Free Trade Zone, and battery sectors showed significant gains [1] - Conversely, the AI corpus, software development, and component sectors experienced declines [1]