中证小盘500指数下跌0.81%，前十大权重包含润和软件等

Group 1 - The core index performance shows mixed results, with the CSI Small Cap 500 Index down by 0.81% to 5556.86 points, with a trading volume of 163.75 billion [1] - Over the past month, the CSI Small Cap 500 Index has decreased by 8.15%, increased by 1.45% over the last three months, and has fallen by 2.15% year-to-date [1] - The top ten weighted stocks in the CSI Small Cap 500 Index include Guangqi Technology (0.88%), Jianghuai Automobile (0.85%), and Chifeng Gold (0.67%) [1] Group 2 - The industry composition of the CSI Small Cap 500 Index shows that industrials account for 22.12%, information technology for 18.54%, and materials for 14.61% [2] - Other sectors include healthcare at 10.41%, financials at 9.24%, and consumer discretionary at 7.41% [2] Group 3 - The CSI 500 Index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December [3] - The adjustment process allows for a maximum sample change of 10%, with a buffer zone for daily trading volume rankings [3] - In special circumstances, temporary adjustments can be made to the CSI 500 Index, utilizing the highest-ranked securities from a prepared list [3]