
Group 1 - The core viewpoint of the news is that the China Securities New Energy Vehicle Index has experienced a decline, reflecting the overall performance of listed companies in the new energy vehicle sector [1][2]. - The China Securities New Energy Vehicle Index has decreased by 4.15% in the past month, 12.37% in the past three months, and 0.15% year-to-date [2]. - The index includes companies involved in lithium batteries, charging piles, and new energy vehicles, with a base date of December 31, 2011, set at 1000.0 points [2]. Group 2 - The top ten weighted companies in the index are: CATL (9.97%), BYD (9.96%), Huichuan Technology (9.81%), Changan Automobile (5.17%), Sanhua Intelligent Control (4.7%), Yiwei Lithium Energy (4.34%), Huayou Cobalt (4.07%), Ganfeng Lithium (2.91%), Greenmech (2.62%), and Tianqi Lithium (2.55%) [2]. - The index's holdings are primarily listed on the Shenzhen Stock Exchange (84.23%), followed by the Shanghai Stock Exchange (15.18%) and the Beijing Stock Exchange (0.59%) [2]. - The industry composition of the index holdings includes 58.87% in industrials, 24.47% in consumer discretionary, 15.49% in materials, and 1.16% in information technology [2]. Group 3 - The index samples are adjusted every six months, with adjustments implemented on the next trading day after the second Friday of June and December [3]. - Weight factors are generally fixed until the next scheduled adjustment, with special circumstances allowing for temporary adjustments [3]. - Companies that are delisted or undergo mergers, acquisitions, or splits are handled according to specific calculation and maintenance guidelines [3].