Group 1 - The Shanghai Composite Index opened lower and the CSI 300 Machinery Manufacturing Index reported 5700.09 points, with a decline of 3.85% over the past month, 9.77% over the past three months, and 0.92% year-to-date [1] - The CSI 300 index categorizes its 300 sample stocks into 11 primary industries, 35 secondary industries, over 90 tertiary industries, and more than 200 quaternary industries, providing analytical tools for investors [1] - The top ten weights in the CSI 300 Machinery Manufacturing Index are: Huichuan Technology (16.04%), Sany Heavy Industry (14.32%), CRRC Corporation (11.82%), Weichai Power (11.25%), China Shipbuilding (9.39%), XCMG (8.67%), China Heavy Industry (6.91%), Hengli Hydraulic (4.86%), Zoomlion (4.79%), and Yutong Bus (4.41%) [1] Group 2 - In terms of industry composition, the CSI 300 Machinery Manufacturing Index consists of 27.78% in engineering machinery, 19.65% in shipbuilding and other shipping equipment, 16.59% in commercial vehicles, 16.04% in electric motors and industrial automation, 15.09% in urban railways, and 4.86% in fluid machinery [2] - The index samples are adjusted biannually, with adjustments implemented on the next trading day following the second Friday of June and December each year [2] - Weight factors are generally fixed until the next scheduled adjustment, with temporary adjustments made in response to changes in the CSI 300 index samples or significant events affecting sample companies [2]