沪指跌破3900点，恒指跌超700点，科网股集体下挫

Market Overview - A-shares and Hong Kong stocks opened lower due to significant declines in the Japanese and South Korean stock markets, as well as a drop in gold and silver prices [1][4] - The three major A-share indices saw substantial declines, with the Shanghai Composite Index falling below 3900 points, down 1.73% [2][3] A-share Performance - The Shanghai Composite Index was at 3888.60, down 68.45 points or 1.73% - The Shenzhen Component Index was at 13580.57, down 285.63 points or 2.06% - The ChiNext Index was at 1635.42, down 34.57 points or 2.07% - The overall A-share market, represented by the Wind All A Index, was at 6342.89, down 129.03 points or 1.99% [3] Sector Performance - Gold and basic metals sectors experienced significant declines; the computing hardware industry chain also fell, with memory and CPO sectors leading the drop - AI computing, semiconductors, consumer electronics, AI applications, and commercial aerospace concept stocks saw notable declines - Conversely, coal stocks performed well, showing resilience in a declining market [3] Hong Kong Market Performance - The Hang Seng Index dropped over 700 points, with a decline of nearly 3% [4] - The Hang Seng Technology Index fell by 3.15%, while the Hang Seng Biotechnology Index decreased by 4.17% [5] Notable Stock Movements - Major tech stocks in Hong Kong, including Alibaba (-2.34%), Tencent (-2.01%), and JD.com (-1.93%), all saw declines - Gold stocks also fell sharply, with Chifeng Jilong Gold Mining down 18.96% and Lingbao Gold down 7.50% - Innovative drug concept stocks opened lower, with Yuan Da Pharmaceutical dropping over 10% - Chip stocks mostly declined, with Zhaoyi Innovation down over 6% - Oil and gas stocks, however, saw gains, with Baijin Oilfield Services rising over 5% [6]