Market Overview - On September 18, the renovation and building materials sector declined by 1.89%, with Zhongqi New Materials leading the drop [1] - The Shanghai Composite Index closed at 3831.66, down 1.15%, while the Shenzhen Component Index closed at 13075.66, down 1.06% [1] Stock Performance - Key stocks in the renovation and building materials sector showed varied performance, with Gongyuan Co. rising by 9.95% to a closing price of 4.64 [1] - Zhongqi New Materials fell by 4.76% to a closing price of 53.08, marking the largest decline in the sector [2] - Other notable declines included Fangda Group down 4.17% and Yanzi New Materials down 3.92% [2] Trading Volume and Capital Flow - The sector experienced a net outflow of 375 million yuan from institutional investors, while retail investors saw a net inflow of 260 million yuan [2] - The total trading volume for Gongyuan Co. was 406,900 shares, with a transaction value of 187 million yuan [1] Individual Stock Capital Flow - Gongyuan Co. had a net inflow of 51.13 million yuan from institutional investors, while retail investors had a net outflow of 26.71 million yuan [3] - Other stocks like Haizhu New Materials and Fashilong also experienced mixed capital flows, with varying net inflows and outflows from different investor types [3]