Group 1 - The professional services sector increased by 1.26% on December 25, with C Tian Shuo leading the gains [1] - The Shanghai Composite Index closed at 3959.62, up 0.47%, while the Shenzhen Component Index closed at 13531.41, up 0.33% [1] - C Tian Shuo's stock price rose by 18.83% to 90.11, with a trading volume of 98,900 shares and a transaction value of 870 million yuan [1] Group 2 - The professional services sector experienced a net outflow of 77.83 million yuan from institutional investors, while retail investors saw a net inflow of 118 million yuan [2][3] - The stock of Su Shi Shi Yan had a net inflow of 45.03 million yuan from institutional investors, but a net outflow of 4.42 million yuan from retail investors [3] - The stock of C Tian Shuo had a net inflow of 74.51 million yuan from institutional investors, with a net outflow of 4.75 million yuan from retail investors [3]