Core Insights - The advertising and marketing sector experienced a decline of 0.69% on September 30, with Zhitian Tui leading the drop [1] - The Shanghai Composite Index closed at 3882.78, up 0.52%, while the Shenzhen Component Index closed at 13526.51, up 0.35% [1] Stock Performance - Yidian Tianxia (301171) saw a significant increase of 13.52%, closing at 34.52 with a trading volume of 695,400 shares [1] - BlueFocus Communication Group (300058) rose by 3.66%, closing at 6.80 with a trading volume of 1,944,000 shares [1] - Zhitian Tui (300280) led the decline with a drop of 9.52%, closing at 0.38 with a trading volume of 132,400 shares [2] Capital Flow - The advertising and marketing sector experienced a net outflow of 344 million yuan from institutional investors, while retail investors saw a net inflow of 337 million yuan [2][3] - BlueFocus Communication Group had a net inflow of 118 million yuan from institutional investors, but a net outflow of 45.41 million yuan from speculative funds [3] - Yidian Tianxia had a net inflow of 66.17 million yuan from institutional investors, with retail investors contributing a net inflow of 50.70 million yuan [3]