收评：沪指跌近1%失守3900点，创业板指跌超4%，半导体板块大幅回调

Market Overview - The stock indices experienced significant declines, with the Shanghai Composite Index falling below 3900 points and the ChiNext Index dropping over 5% at one point [1] - At the close, the Shanghai Composite Index decreased by 0.94% to 3897.03 points, the Shenzhen Component Index fell by 2.7% to 13355.42 points, and the ChiNext Index declined by 4.55% to 3113.26 points [1] - The STAR 50 Index saw a drop of 5.61%, with total trading volume across the Shanghai and Shenzhen markets reaching 25,345 billion yuan [1] Sector Performance - The semiconductor sector experienced a significant downturn, with declines in non-ferrous metals and chip stocks [1] - Conversely, sectors such as gas, coal, steel, agriculture, food and beverage, oil, and real estate showed gains [1] - Financial sectors including insurance, banking, brokerage, and liquor also saw upward movement [1] Market Sentiment and Future Outlook - According to China International Capital Corporation (CICC), the market is currently in a consolidation phase that has persisted since late August, and a trend-driven market may require new catalysts [1] - Despite the downward pressure, the risk of further declines is considered limited due to several important changes that have previously heightened market liquidity [1] - The upcoming Fourth Plenary Session of the 20th Central Committee in October is expected to review the "14th Five-Year Plan" proposals, which may support market expectations [1]