A股收评：三大指数大涨，沪指涨1.38%重返4000点创指涨近3%，脑机接口爆发！超4100股上涨，成交2.57万亿放量5015亿；机构解读

Market Overview - The market opened positively in 2026, with the ChiNext Index rising nearly 3% and the Shanghai Composite Index returning to 4000 points. The total trading volume in the Shanghai and Shenzhen markets reached 2.55 trillion yuan, an increase of 501.1 billion yuan compared to the previous trading day [2] - The Shanghai Composite Index closed at 4023.42 points, up 1.38%, while the Shenzhen Component Index closed at 13828.63 points, up 2.24%, and the ChiNext Index closed at 3294.55 points, up 2.85% [2] Sector Performance - The AI application sector saw significant gains, with stocks like BlueFocus hitting the daily limit and reaching a ten-year high. Other stocks in the sector also performed well [5] - The brain-computer interface sector was strong throughout the day, with nearly 30 stocks hitting the daily limit [2][3] - The storage chip sector continued to rise, with stocks such as Puran and West Test hitting the daily limit, and others like Shannon Chip and Jiangbo Long rising over 10% [4] Key Developments - The price of storage chips is expected to surge due to strong demand from AI, with DDR4 16Gb prices increasing by 1800%, DDR5 16Gb by 500%, and 512Gb NAND flash by 300% by 2025 [4] - Beijing's artificial intelligence core industry is projected to reach a scale of 450 billion yuan by 2025, with over 2500 companies expected to be concentrated in the area [8] - The National Railway's total revenue is expected to exceed 1 trillion yuan for the first time, reaching 1.0204 trillion yuan in 2025, a year-on-year increase of 3.1% [8] Institutional Insights - Citic Securities anticipates that the biggest expectation gap in 2026 will stem from balancing external and internal demand, suggesting that external taxation and internal subsidies will be trends to watch [9] - Huatai Securities notes that while short-term market predictions are challenging due to geopolitical issues, the overall trend for the spring market remains upward, supported by improving PMI data and ample market liquidity [9]