午评：沪指涨0.12% 医疗器械板块走高

Market Overview - The three major indices opened slightly higher but then fluctuated downwards, with the Shenzhen Component and ChiNext indices turning negative during the session [1] - As of the midday close, the Shanghai Composite Index was at 3638.40 points, up 0.12%; the Shenzhen Component was at 11163.36 points, down 0.13%; and the ChiNext Index was at 2346.59 points, down 0.52% [1] Sector Performance - Sectors such as semiconductors, medical devices, and logistics showed the highest gains, while small metals, steel, and biopharmaceuticals experienced the largest declines [2] - The semiconductor sector led with a gain of 2.76%, followed by medical devices at 1.69% and logistics at 1.51% [3] - In contrast, the small metals sector fell by 1.28%, steel by 1.22%, and biopharmaceuticals by 1.19% [3] Detailed Sector Analysis - Top Performing Sectors: - Semiconductors: +2.76%, total trading volume of 1676.95 million hands, total transaction value of 776.26 billion, net inflow of 62.36 billion, with 144 stocks rising and 17 falling [3] - Medical Devices: +1.69%, total trading volume of 1186.88 million hands, total transaction value of 226.61 billion, net inflow of 4.93 billion, with 101 stocks rising and 29 falling [3] - Logistics: +1.51%, total trading volume of 747.29 million hands, total transaction value of 75.96 billion, net inflow of 10.93 billion, with 37 stocks rising and 12 falling [3] - Underperforming Sectors: - Small Metals: -1.28%, total trading volume of 679.55 million hands, total transaction value of 153.61 billion, net outflow of 23.24 billion, with 3 stocks rising and 23 falling [3] - Steel: -1.22%, total trading volume of 2520.18 million hands, total transaction value of 92.64 billion, net outflow of 19.54 billion, with 5 stocks rising and 27 falling [3] - Biopharmaceuticals: -1.19%, total trading volume of 434.29 million hands, total transaction value of 103.89 billion, net outflow of 15.00 billion, with 10 stocks rising and 42 falling [3]