Core Insights - The professional services sector experienced a slight increase of 0.47% on December 18, with Fengshang Culture leading the gains [1] - The Shanghai Composite Index closed at 3876.37, up 0.16%, while the Shenzhen Component Index closed at 13053.98, down 1.29% [1] Performance Summary - Fengshang Culture (300860) closed at 28.01, up 7.52% with a trading volume of 117,500 shares and a transaction value of 331 million yuan [1] - Beikang Testing (920160) closed at 26.20, up 3.23% with a trading volume of 39,600 shares and a transaction value of 102 million yuan [1] - Jianyan Institute (603183) closed at 4.30, up 2.38% with a trading volume of 131,900 shares and a transaction value of 56.61 million yuan [1] - Lihua Technology (002243) closed at 9.15, up 2.23% with a trading volume of 180,000 shares and a transaction value of 164 million yuan [1] - Guoyi Bidding (920039) closed at 11.91, up 2.14% with a trading volume of 38,700 shares and a transaction value of 46.12 million yuan [1] - Other notable performers include Shishi Testing (300416) and Puni Testing (300887), with increases of 1.59% and 1.55% respectively [1] Capital Flow Analysis - The professional services sector saw a net outflow of 35.42 million yuan from institutional investors and 34.01 million yuan from retail investors, while retail investors had a net inflow of 69.43 million yuan [2] - Lihua Technology (002243) had a net inflow of 26.40 million yuan from institutional investors, while Fengshang Culture (300860) saw a net inflow of 13.05 million yuan [3] - Other companies like Xince Standard (300938) and Su Testing (300416) also experienced varying levels of net inflow and outflow from different investor categories [3]