收评：沪指微跌0.07%险守4000点 医药等防御性板块逆势走强

Market Overview - The market showed signs of recovery after hitting a low, with the Shanghai Composite Index slightly down and the ChiNext Index briefly turning positive at the end of the trading session [1] - The total trading volume in the Shanghai and Shenzhen markets was 1.95 trillion yuan, a decrease of 48.6 billion yuan compared to the previous trading day [1] Sector Performance - Defensive sectors collectively strengthened, with the oil and gas sector experiencing a significant surge, leading to stocks like PetroChina and Zhongman Petroleum reaching their daily limit [1] - The pharmaceutical sector continued to rise, particularly in the cell immunotherapy concept, with stocks such as Kaineng Health and Jimin Health hitting their daily limit [1] - The banking sector performed strongly, with Agricultural Bank of China and Industrial and Commercial Bank of China both reaching historical highs [1] - The consumer sector showed localized activity, with stocks like Sanyuan Foods and Zhongrui Shares achieving three consecutive trading limit increases, and Dongbai Group achieving four limit increases in six days [1] - The lithium battery sector saw a late-session rally, with Tianji Shares achieving three limit increases in four days [1] Declining Sectors - The superhard materials sector experienced a collective decline, with World falling over 10% [1] - Sectors such as insurance, pharmaceuticals, and oil and gas saw the largest gains, while sectors like cultivated diamonds, photovoltaics, and controllable nuclear fusion faced the largest declines [1] Closing Summary - At the close, the Shanghai Composite Index fell by 0.07%, the Shenzhen Component Index decreased by 0.36%, and the ChiNext Index dropped by 0.39% [1]