A股，尾盘突变！

Market Overview - A-shares exhibited a mixed performance on July 15, with the Shanghai Composite Index falling approximately 1% at one point, dropping below 3500 points, while the ChiNext Index surged over 2% [1][2] - The Shanghai Composite Index closed down 0.42% at 3505 points, the Shenzhen Component Index rose 0.56% to 10744.56 points, and the ChiNext Index increased by 1.73% to 2235.05 points [2] - The total trading volume in the Shanghai and Shenzhen markets reached 16,353 billion yuan, an increase of over 1,500 billion yuan compared to the previous day [2] Sector Performance - The power and coal sectors experienced declines, with companies like Huayin Power and Tuori New Energy hitting the daily limit down, and Dayou Energy dropping over 9% [2][13] - The banking sector also faced losses, with Qilu Bank falling over 3% and Ping An Bank and Zheshang Bank declining around 2% [2] - Conversely, AI-related stocks saw significant gains, with New Yi Sheng hitting a 20% limit up, marking a historical high, and Zhongji Xuchuang rising nearly 17% [2][5] AI Sector Developments - The NVIDIA concept stocks experienced a notable surge, with Zhongji Xuchuang rising nearly 17%, and other stocks like Shenghong Technology and Yipinhong increasing over 13% [5] - NVIDIA announced the resumption of H20 sales to China and introduced a new GPU compliant with Chinese regulations, which is expected to alleviate the domestic chip shortage in computing power [7] - The recovery of H20 sales is anticipated to meet some of the domestic demand for AI model training and inference, enhancing the hardware and software capabilities of domestic AI models [7] AI Intelligent Agent Concept - The AI intelligent agent concept saw active trading, with Dingjie Zhizhi hitting a 20% limit up and other stocks like Zhiyuan Huli and Pulian Software rising over 10% [9][11] - The World Digital Academy released the AISTR series new standards for AI intelligent agent operation safety testing, marking the first global standard for single-agent operation safety [11] - The year 2025 is projected to be the "Year of Intelligent Agents," as AI evolves from simple responses to complex decision-making and execution capabilities [11] Power Sector Decline - The previously strong power sector saw a collective decline, with Huayin Power and Tuori New Energy hitting the daily limit down, and ShenNan Electric A dropping over 8% [13][15] - Huayin Power's stock had previously surged over 100% in the last 10 trading days, raising concerns about potential short-term pullbacks [15] - Tuori New Energy projected a loss of 48 million to 68 million yuan for the first half of the year due to intensified competition in the photovoltaic industry [15]