A股开门红！沪指放量大涨重回4000点，两市成交额2.55万亿元

Market Performance - On January 5, 2026, A-shares opened strong, with all three major indices rising collectively, and the Shanghai Composite Index surpassing the 4000-point mark for the first time in over 30 trading days [1] - By the end of the trading day, the Shanghai Composite Index increased by 1.38% to 4023.42 points, marking a "12 consecutive days" rise; the Shenzhen Component Index and the ChiNext Index rose by 2.24% and 2.85%, closing at 13828.63 points and 3294.55 points respectively [1] - The STAR 50 Index performed notably well, rising by 4.4% to 1403.41 points [1] Sector Performance - The brain engineering sector led the market, with several stocks, including Sanbo Brain Science, Botao Biology, and Daoshi Technology, hitting the 20% daily limit [1] - The insurance sector was active throughout the day, with all major stocks in the sector showing gains [1] - Other sectors with significant gains included fourth-generation semiconductors, medical devices, and AI pharmaceuticals, while sectors such as Hainan, duty-free concepts, and tax refund stores experienced declines [1] Trading Volume - The trading volume for the Shanghai Stock Exchange reached approximately 10,673.34 billion yuan, while the Shenzhen Stock Exchange recorded about 14,790.13 billion yuan, leading to a total trading volume of around 25.5 trillion yuan across both exchanges [1]