装修建材板块12月31日跌0.21%，扬子新材领跌，主力资金净流出2.24亿元

Market Overview - The renovation and building materials sector experienced a decline of 0.21% on December 31, with Yangzi New Materials leading the drop [1] - The Shanghai Composite Index closed at 3968.84, up 0.09%, while the Shenzhen Component Index closed at 13525.02, down 0.58% [1] Stock Performance - Notable gainers in the renovation and building materials sector included: - Youbang Dading (002718) with a closing price of 35.94, up 10.01% [1] - Xiong Plastic Technology (300599) at 8.15, up 8.52% [1] - Kaier New Materials (300234) at 5.50, up 4.96% [1] - Conversely, significant decliners included: - Yangzi New Materials (002652) at 3.95, down 9.61% [2] - Wanli Stone (002785) at 35.32, down 4.54% [2] - Jingxue Energy Saving (301010) at 22.15, down 3.86% [2] Capital Flow - The renovation and building materials sector saw a net outflow of 224 million yuan from institutional investors, while retail investors experienced a net inflow of approximately 99.88 million yuan [2] - The detailed capital flow for selected stocks showed: - Keshun Co., Ltd. (300737) had a net inflow of 16.95 million yuan from institutional investors [3] - Youbang Dading (002718) saw a net inflow of 8.76 million yuan from institutional investors [3] - Yangzi New Materials (002652) had a net inflow of 5.66 million yuan from retail investors [3]