Jin Rong Jie·2025-07-08 08:25Group 1 - The core viewpoint of the news is the performance of the CSI 800 Materials Theme Index, which has shown significant growth over various time frames, indicating a positive trend in the materials sector [1][2] - The CSI 800 Materials Theme Index reported a value of 2899.41 points, with a 3.48% increase over the past month, a 12.06% increase over the past three months, and an 8.07% increase year-to-date [1] - The index is composed of listed companies in the materials sector selected from the CSI 800 Index, reflecting the overall performance of these companies [1] Group 2 - The top ten weighted companies in the CSI 800 Materials Theme Index include Zijin Mining (12.74%), Wanhua Chemical (4.0%), and Yilong Co. (2.48%), among others [1] - The market share of the index's holdings is predominantly from the Shanghai Stock Exchange (65.19%) and the Shenzhen Stock Exchange (34.81%) [1] - In terms of industry composition, non-ferrous metals account for 50.67%, chemicals for 32.62%, steel for 8.63%, non-metallic materials for 6.87%, and paper and packaging for 1.22% [2] Group 3 - The index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December [2] - Weight factors are generally fixed until the next scheduled adjustment, with special circumstances allowing for temporary adjustments [2] - Companies that are delisted or undergo mergers, acquisitions, or splits are handled according to specific calculation and maintenance guidelines [2]