专业服务板块9月15日涨0.78%，安车检测领涨，主力资金净流入8786.78万元

Core Insights - The professional services sector saw an increase of 0.78% on September 15, with Ancar Detection leading the gains [1] - The Shanghai Composite Index closed at 3860.5, down 0.26%, while the Shenzhen Component Index closed at 13005.77, up 0.63% [1] Stock Performance Summary - Ancar Detection (300572) closed at 27.30, up 11.52% with a trading volume of 253,600 shares and a transaction value of 673 million [1] - Shippu Detection (301228) closed at 30.17, up 7.56% with a trading volume of 64,000 shares and a transaction value of 186 million [1] - Steel Research Nack (300797) closed at 18.24, up 4.77% with a trading volume of 222,500 shares and a transaction value of 397 million [1] - Other notable performers include Electric Science Institute (300215) up 4.72% and Guangdong Construction Science (301632) up 4.01% [1] Capital Flow Analysis - The professional services sector experienced a net inflow of 87.87 million from institutional investors, while retail investors saw a net outflow of 130 million [2][3] - Ancar Detection had a net outflow of 35.93 million from institutional investors, while Steel Research Nack saw a net inflow of 35.35 million [3] - Other companies like Guangdong Construction Science and Electric Science Institute also had varying levels of net inflow and outflow from different investor categories [3]