专业服务板块9月4日跌0.76%，信测标准领跌，主力资金净流出3.1亿元

Market Overview - On September 4, the professional services sector declined by 0.76%, with Xince Standard leading the drop [1] - The Shanghai Composite Index closed at 3765.88, down 1.25%, while the Shenzhen Component Index closed at 12118.7, down 2.83% [1] Stock Performance - Notable gainers in the professional services sector included: - Lansheng Co., Ltd. (600826) with a closing price of 12.82, up 3.30% on a trading volume of 598,500 shares and a turnover of 759 million [1] - Jianyan Institute (603183) closed at 4.37, up 2.10% with a trading volume of 127,900 shares and a turnover of 55.88 million [1] - Major decliners included: - Xince Standard (300938) with a closing price of 24.51, down 6.13% on a trading volume of 189,500 shares and a turnover of 472 million [2] - Shengke Nano (688757) closed at 28.88, down 4.62% with a trading volume of 32,000 shares and a turnover of 94.15 million [2] Capital Flow - The professional services sector experienced a net outflow of 310 million from institutional investors, while retail investors saw a net inflow of 316 million [2] - Specific stock capital flows indicated: - Shibai Testing (301228) had a net inflow of 5.64 million from institutional investors, but a net outflow of 724,100 from retail investors [3] - Foreign Service Holdings (600662) saw a net inflow of 2.51 million from institutional investors and a net outflow of 4.26 million from retail investors [3]