A股全线收跌，信息安全概念崛起，AI产业链股活跃

Market Overview - The A-share market experienced a significant drop on July 31, with the Shanghai Composite Index falling over 1% and closing below 3600 points, while the total trading volume approached 2 trillion yuan [1] - The Shanghai Composite Index closed at 3573.21 points, down 1.18%, the Shenzhen Component Index fell 1.73% to 11009.77 points, and the ChiNext Index decreased by 1.66% to 2328.31 points [1][2] Sector Performance - The overall market showed weakness, with nearly 4300 stocks declining, particularly in sectors such as coal, steel, oil, and non-ferrous metals [2] - The information security sector saw a strong performance, with stocks like Digital Certification and Nansheng Co. hitting the daily limit, while companies like Yonyou Network and Yongxin Zhicheng rose over 8% [2][4] - The assisted reproduction sector also surged, with stocks like Anke Bio and Gongtong Pharmaceutical reaching a 20% increase, and Guangshentang rising over 18% [11][12] AI Industry - The AI industry chain stocks were active, with companies like Fangsheng Co. and Dingtong Technology seeing significant gains, reflecting a growing interest in AI applications [7][8] - Domestic AI models have shown performance comparable to leading overseas models, with advancements in AI chip manufacturing by companies like Haiguang Information and Huawei [9] Policy Impact - The recent announcement of a child-rearing subsidy policy by the central government is expected to stimulate consumption in maternal and infant-related sectors, with an initial budget of approximately 90 billion yuan allocated for this purpose [13] - The implementation of this policy is anticipated to boost the birth rate and support industries related to assisted reproduction, genetic testing, and childcare services [13]