Cambricon(SH:688256) 天天基金网·2025-09-04 05:09Market Overview - On September 4, the Shanghai Composite Index opened down 0.15%, while the Shenzhen Component Index opened up 0.44%, and the ChiNext Index opened up 1.18%. By the time of reporting, the Shanghai Composite Index had fallen by 1.63% to 3751.53 points, the Shenzhen Component Index had decreased by 2.06% to 12214.93 points, and the ChiNext Index had dropped by 2.81% to 2817.87 points [2]. Key Stock Movements - The stock of Cambrian (寒武纪) experienced a significant decline, dropping over 10% to a latest price of 1252.05 CNY per share, falling below the 1300 CNY mark, with a total trading volume exceeding 15 billion CNY [3]. - Cambrian's weight in the STAR 50 Index is currently 15.42%, and the top five stocks in the index account for a combined weight of 46.23% [5][6]. Index Adjustment Impact - The Shanghai Stock Exchange and China Securities Index Co., Ltd. announced an adjustment to the STAR 50 Index, effective after the market closes on September 12. This adjustment will limit the weight of individual samples to no more than 10% and the combined weight of the top five samples to no more than 40% [5]. - Due to the index adjustment, it is estimated that approximately 10 billion CNY will flow out of Cambrian as index-tracking funds will need to rebalance their portfolios [6]. Sector Performance - The tourism sector showed resilience, with stocks like Lingnan Holdings rising over 6%, and other companies such as Tianfu Culture and Caesar Travel also experiencing gains [7]. - Conversely, sectors such as semiconductors and precious metals faced declines, with stocks like New Yisheng, Tianfu Communication, and Taicheng Light dropping over 10% [7].