Group 1 - The Shanghai Stock Exchange Sci-Tech Innovation Board Industrial Machinery Index (Sci-Tech Machinery, 000693) opened lower and fluctuated, down 0.5% to 1050.03 points, with a trading volume of 6.775 billion yuan [1] - Over the past month, the index has decreased by 1.78%, down 12.03% over the last three months, but has increased by 5.19% year-to-date [1] - The index consists of 50 large-cap stocks from sectors such as urban rail transit equipment, industrial automation, and engineering machinery, reflecting the overall performance of representative industrial machinery companies listed on the Sci-Tech Innovation Board [1] Group 2 - The top ten weightings in the index are: Zhongkong Technology (10.44%), Bochu Electronics (6.06%), Daotong Technology (5.44%), Lide Harmony (4.97%), China Communication Signal (4.95%), Bolite (4.87%), Times Electric (4.16%), Zhengfan Technology (2.87%), Honghua Digital Science (2.81%), and Dongwei Technology (2.45%) [1] - The index's holdings are entirely from the Shanghai Stock Exchange, with an industry allocation of 100% in industrial sectors [1] Group 3 - The index sample is adjusted quarterly, with adjustments implemented on the next trading day following the second Friday of March, June, September, and December [2] - Weight factors are generally fixed until the next scheduled adjustment, with temporary adjustments made under special circumstances, such as delisting or corporate actions like mergers and acquisitions [2]