一周市场回顾（2025.12.15—2025.12.19）

Market Performance - The Shanghai Composite Index increased by 0.03%, closing at 3890.45 points, while the Shenzhen Component Index decreased by 0.89%, closing at 13140.21 points, and the ChiNext Index fell by 2.26%, closing at 3122.24 points[5] - The average daily trading volume of A-shares was 17,605 billion yuan, a decrease of 9.86% compared to the previous week[17] Sector Performance - The top-performing sectors included retail trade (6.66%), non-bank financials (2.90%), beauty and personal care (2.87%), social services (2.66%), and basic chemicals (2.58%)[14] - The sectors with the largest declines were electronics (-3.28%), electric equipment (-3.12%), machinery (-1.56%), comprehensive (-1.53%), and telecommunications (-0.89%) [14] Margin Trading - As of December 19, the total margin balance in the market was 25,038.28 billion yuan, an increase of 0.10% from the previous week, accounting for 2.60% of the A-share market capitalization, up by 0.15%[19] - The total margin trading volume for the week was 8,914.71 billion yuan, a decrease of 10.41%, representing 10.13% of the A-share trading volume, down by 0.61%[18] Market Breakdown - The margin balances for the Shanghai Stock Exchange, Shenzhen Stock Exchange, and Beijing Stock Exchange were 12,687.40 billion yuan, 12,273.34 billion yuan, and 77.54 billion yuan, with changes of 0.36%, -0.17%, and 0.51% respectively[22] - The top five industries with increased margin balances were utilities (1.81 billion yuan), commercial trade (1.49 billion yuan), non-bank financials (1.33 billion yuan), defense and military (1.12 billion yuan), and electronics (0.98 billion yuan)[25]