A股收评：沪指3700点得而复失！军工板块下挫，保险股活跃

Market Overview - The three major A-share indices experienced fluctuations, with the Shanghai Composite Index closing down 0.46% at 3666 points, having briefly surpassed 3700 points during the day [1] - The Shenzhen Component Index fell by 0.87%, while the ChiNext Index dropped by 1.08%, and the North Star 50 Index decreased by 1.99% [1] - Total trading volume reached 2.31 trillion yuan, an increase of 131.1 billion yuan compared to the previous trading day, marking the second consecutive day of over 2 trillion yuan in trading volume [1] Sector Performance - The housing inspection and aerosol detection sectors saw significant declines, with Huajian Group hitting the daily limit down [2] - Military and aerospace sectors also faced downturns, with Tianqin Equipment dropping over 11% and Hengyu Xintong nearly 9% [2][3] - The PCB sector weakened, with Defu Technology falling over 11% [2] - The 6G concept stocks performed poorly, with Dingyang Technology declining over 12% [2] - The insurance sector was active, with China Pacific Insurance rising nearly 5% [2] - The electronic ID and digital sentinel sectors surged, with Hengbao Co. hitting the daily limit up [2] Notable Stock Movements - Military stocks experienced significant pullbacks, with Tianqin Equipment down 11.23% and Jiekang Equipment down 9.26% [4] - Semiconductor and component stocks also declined, with Huicheng Co. falling over 7% [5][6] - The housing inspection sector saw C Guangjian Technology drop over 13% and Huajian Group hit the daily limit down [7][8] - Insurance stocks showed gains, with China Pacific Insurance up over 4% [9] - Brain-computer interface stocks surged, with Botuo Bio hitting the daily limit up and Innovation Medical also reaching the daily limit [10] Investment Insights - The semiconductor cycle is still in an upward trend, driven by strong AI demand and recovery in the industrial sector [6] - The market structure in 2023 resembles an "enhanced version of 2013," with small-cap and growth styles prevailing [12] - Recommended sectors for investment include AI/computing power, innovative pharmaceuticals, military, and non-ferrous metals, as well as brokers and insurance benefiting from increased retail investment [13]