收评：A股迎来2026年开门红，沪指12连阳收复4000点，两市成交突破2.5万亿

Market Performance - The A-share market opened strongly in 2026, with the Shanghai Composite Index rising 1.38% to 4023.42 points, marking a 12-day winning streak and reclaiming the 4000-point level [1] - The Shenzhen Component Index increased by 2.24% to 13828.63 points, while the ChiNext Index rose by 2.85% to 3294.55 points, and the STAR 50 Index surged by 4.4% to 1403.41 points [1] - The total trading volume in the Shanghai and Shenzhen markets reached 25,463.47 billion yuan, an increase of 5,011 billion yuan compared to the previous trading day [1] Sector Performance - Key sectors that performed well included brain-computer interfaces, innovative pharmaceuticals, insurance, storage chips, AI applications, military equipment, and non-ferrous metals [1] - Conversely, sectors such as Hainan Free Trade Zone, tourism and hotels, pork, steel, banking, and automotive showed weaker performance [1] AI and Storage Chip Developments - AI applications continued to strengthen, with stocks like Zhuoyi Information hitting the daily limit, and BlueFocus rising over 15% to reach a 10-year high [1] - The storage chip sector also saw significant gains, with stocks like Purun and Yunhan Chip City hitting the daily limit, and companies like Zhaoyi Innovation and Hengsuo rising sharply [2] - The demand for storage chips is expected to surge, with prices for DDR4 16Gb chips increasing by 1800%, DDR5 16Gb by 500%, and 512Gb NAND flash memory by 300% by 2025 [2] PCB and Military Sector Insights - The PCB sector experienced a rally, with stocks like Shenghong Technology and Shenzhen South Circuit achieving notable gains [2] - The military sector also saw upward movement, with stocks like Jianglong Shipbuilding hitting the daily limit and other military-related companies following suit [2] Analyst Perspectives - Citic Securities highlighted that balancing external and internal demand will be a major focus in 2026, with expectations for tax reforms and subsidies to stimulate domestic demand [3] - Huatai Securities noted that the positive sentiment from overseas Chinese stocks could influence investor behavior, although geopolitical issues may create short-term volatility [3] - CITIC Construction emphasized that post-holiday, investor risk aversion is likely to decrease, leading to a more proactive search for opportunities, supporting an upward trend in A-shares [3]