汽车服务板块7月31日跌1.66%，厦门信达领跌，主力资金净流出9134.27万元

Market Overview - The automotive service sector experienced a decline of 1.66% on July 31, with Xiamen Xinda leading the drop [1] - The Shanghai Composite Index closed at 3573.21, down 1.18%, while the Shenzhen Component Index closed at 11009.77, down 1.73% [1] Individual Stock Performance - Notable stock performances include: - Altec (300825) rose by 1.49% to close at 11.57, with a trading volume of 227,400 shares and a turnover of 265 million yuan [1] - Xiamen Xinda (000701) fell by 5.30% to close at 6.25, with a trading volume of 727,600 shares and a turnover of 463 million yuan [2] - Other stocks such as China Automotive Research (601965) and Shanghai Material Trade (600822) also saw declines of 1.57% and 1.30%, respectively [1][2] Capital Flow Analysis - The automotive service sector saw a net outflow of 91.34 million yuan from institutional investors, while retail investors contributed a net inflow of 52.18 million yuan [2] - The capital flow for individual stocks indicates: - Altec had a net inflow of 23.17 million yuan from institutional investors, while retail investors had a net outflow of 16.84 million yuan [3] - Xiamen Xinda experienced a significant net outflow of 88.76 million yuan from institutional investors, but a net inflow of 80.01 million yuan from retail investors [3]