A股三大指数收跌，沪指险守4100点

Market Performance - The A-share market opened high but closed lower, with the Shanghai Composite Index down by 0.26%, barely holding above the 4100-point mark [1] - The Shenzhen Component Index fell by 0.18%, closing at 14281.08 points, while the ChiNext Index decreased by 0.2%, ending at 3361.02 points [1] Sector Performance - Approximately 3000 stocks in the Shanghai and Shenzhen markets were in the red, with total trading volume reaching 3.06 trillion [3] - The semiconductor, robotics, electric grid equipment, and computing hardware sectors saw significant gains, with stocks like Tianyue Advanced and Tongfu Microelectronics hitting the daily limit [3] - Robotics concept stocks also performed well, with companies such as Wuzhou New Spring and Founder Electric reaching their daily limit [3] - The electric grid equipment sector surged, with stocks like Siyuan Electric and Jicheng Electronics also hitting the daily limit [3] - Conversely, sectors such as AI applications, oil and gas, pharmaceuticals, and digital currencies experienced declines, with AI application stocks facing a wave of limit-downs, including Xinhua Du and Tianxia Xiu [3]