新股周报：3月份双创板块新股首日涨幅下降，科创板胜科纳米上市

Investment Rating - The report does not explicitly provide an investment rating for the companies discussed [4]. Core Insights - The new stock market activity has decreased, with the first-day price increase of new stocks on the Sci-Tech Innovation Board declining, while the opening board valuation has increased [2][12]. - The report highlights the performance of newly listed stocks, including a significant first-day increase of 241.41% for Shengke Nano, with an opening board valuation of 154.01 times [16][18]. - The report notes that the first-day price increase and opening board valuation for new stocks on the ChiNext Board have both decreased [25][35]. Summary by Sections New Stock Market Activity - In March, the activity in the new stock market declined, with only 11 stocks (22.45% of new listings) recording positive price changes, down from 26.09% previously [2][12]. - The total number of new stocks listed since the beginning of 2023 is 337, raising a total of 409.53 billion yuan [12]. Sci-Tech Innovation Board - Shengke Nano was listed last week with a first-day price increase of 241.41% and an opening valuation of 154.01 times [16][18]. - Other stocks like Pioneering Precision and Sikan Technology recorded positive weekly increases, while Shengke Nano experienced a weekly decline of over 10% [16][24]. ChiNext Board - New stocks such as Zhejiang Huaye, Zhejiang Huayuan, and Xidian Co. were listed, with some stocks like Huitong Technology and Boyuan Shares recording positive weekly increases [24][25]. - The first-day price increase for ChiNext stocks was 225.71%, down from 299.99% in January, and the opening board valuation decreased to 48.14 times [25][35]. Main Board - No new stocks were listed on the Main Board last week, but Tianhe Magnetic Materials recorded a weekly increase of over 10% [31][35]. - The first-day price increase for Main Board stocks was 289.09%, up from 261.71% in January, with an opening valuation of 58.28 times [35]. Key Newly Listed Stocks - The report identifies key newly listed stocks since January 2023, including Shengke Nano, Hongjing Optics, and Sikan Technology, among others [4][48]. - It also lists stocks that have received approval from the regulatory authority, such as Weigao Blood Purification and Yitang Technology [44][45].