AI链国产化能力日益增强，存储涨价周期明确

Core Insights - The SW semiconductor index increased by 14.07% in September 2025, outperforming the electronics sector by 3.10 percentage points and the CSI 300 index by 10.86 percentage points [2] - The global semiconductor sales reached $64.88 billion in August 2025, showing a year-on-year growth of 21.7% and a quarter-on-quarter increase of 4.4% [4] - The domestic AI chip ecosystem is increasingly capable of localization, with several companies adapting to new models simultaneously [6] Semiconductor Index Performance - The SW semiconductor index's PE (TTM) was 118.97x as of September 30, 2025, positioned at the 91.58 percentile since 2019 [2] - Semiconductor equipment and materials led the sub-industry performance with increases of 27.82% and 14.72%, respectively [2] Fund Holdings and Market Trends - In Q2 2025, active funds had a semiconductor holding ratio of 10.1%, which is 5.6 percentage points above the semiconductor market cap ratio of 4.48% [3] - The top twenty holdings saw new additions of companies like Naxin Micro and Sierpu, while others like Fengcai Technology were replaced [3] Global Sales and Price Trends - The semiconductor sales in China reached $17.63 billion in August 2025, with a year-on-year growth of 12.4% [4] - DRAM and NAND Flash prices are expected to rise, with forecasts indicating a quarter-on-quarter increase of 8%-13% for DRAM and 5%-10% for NAND Flash in Q4 2025 [4][6] Investment Strategy - The domestic AI supply chain is strengthening, with recommendations for companies like Cambrian, Aojie Technology, and others [6] - The semiconductor industry is expected to benefit from rising storage prices and increased demand driven by AI applications [6] Capacity Growth Projections - SEMI projects a CAGR of 8.1% for China's wafer fab capacity from 2024 to 2028, surpassing the global average of 5.3% [7] - Companies such as SMIC and Hua Hong Semiconductor are highlighted as key players in the production chain [7]