收评：沪指跌近1%失守4000点，半导体板块大幅下挫，医药板块逆市拉升

Market Overview - The Shanghai Composite Index experienced a narrow fluctuation and accelerated decline towards the end of the trading session, falling below the 4000-point mark [1] - The closing figures showed the Shanghai Composite Index down by 0.97% at 3990.49 points, the Shenzhen Component Index down by 1.93% at 13216.03 points, and the ChiNext Index down by 2.82% at 3111.51 points [1] - A total of 3300 stocks in the market were in the red, with a combined trading volume of 198.06 billion yuan across the Shanghai and Shenzhen exchanges [1] Sector Performance - The semiconductor sector saw a significant decline, while sectors such as food and beverage, insurance, brokerage, and liquor also experienced downturns [1] - Conversely, sectors like gas, oil, pharmaceuticals, and real estate showed upward movement, with active concepts in Hainan Free Trade, innovative drugs, and biological vaccines [1] Analyst Insights - According to CITIC Securities, the market is currently in the mid-stage of a bull market, with the cost-performance ratio of equity assets declining [1] - The A-share market is entering a critical period for verifying economic prosperity, with indices expected to continue fluctuating upwards but at a slower pace [1] - There may be a style-switching trend, where sectors with high valuations but lowered growth expectations could face temporary adjustments, while those with improved fundamental expectations may lead the market [1]