华润微股价连续4天下跌累计跌幅6.91%，大成基金旗下1只基金持1.81万股，浮亏损失7.58万元

Group 1 - The core point of the news is that China Resources Microelectronics has experienced a decline in stock price, falling 2.41% to 56.33 CNY per share, with a total market capitalization of 74.78 billion CNY and a cumulative drop of 6.91% over the past four days [1] - The company, established on January 28, 2003, specializes in the design, production, and sales of power semiconductors, smart sensors, and smart control products, as well as providing open wafer manufacturing and packaging testing services [1] - The revenue composition of the company includes 54.34% from products and solutions, 42.92% from manufacturing and services, and 2.74% from other sources [1] Group 2 - From the perspective of major fund holdings, China Resources Microelectronics is a significant holding for the Dachen Fund, which reduced its position by 6,880 shares, holding a total of 18,100 shares, representing 0.94% of the fund's net value [2] - The Dachen Fund's performance this year has yielded a return of 10.6%, ranking 1062 out of 5517 in its category, with a cumulative return of 51.38% since inception [2] - The fund manager, Xia Gao, has a tenure of 11 years and 42 days, with the best fund return during this period being 247.36% and the worst being -71.74% [2]