Zheng Xing Xing Ye Ri Bao·2025-12-29 08:58Group 1 - The plastic sector experienced a significant increase of 3.24% on December 29, with Shangwei New Materials leading the gains [1] - The Shanghai Composite Index closed at 3965.28, up 0.04%, while the Shenzhen Component Index closed at 13537.1, down 0.49% [1] - Notable stocks in the plastic sector included Shangwei New Materials, which rose by 20.00% to a closing price of 132.13, and Heshun Technology, which increased by 19.99% to 58.34 [1] Group 2 - The plastic sector saw a net inflow of 57.98 million yuan from main funds, while retail investors contributed a net inflow of 15.6 million yuan [2] - Major stocks like Fushun Technology and Jinfat Technology had significant main fund inflows of 227 million yuan and 217 million yuan, respectively [3] - Retail investors showed a net outflow in several stocks, including Heshun Technology and Shangwei New Materials, indicating varied investor sentiment [3]