上证580指数上涨1.3%，前十大权重包含内蒙一机等

Group 1 - The Shanghai 580 Index opened lower but closed higher, increasing by 1.3% to 1674.0 points, with a trading volume of 161.223 billion yuan [1] - The Shanghai 580 Index has risen by 10.14% in the past month, 12.55% in the past three months, and 17.29% year-to-date [1] - The index consists of 580 securities selected from the Shanghai Stock Exchange, focusing on smaller market capitalization and higher liquidity [1] Group 2 - The top ten weighted stocks in the Shanghai 580 Index include Yifang Bio (0.58%), Shijia Photon (0.57%), Huachuang Yuxin (0.56%), and others [1] - The index is fully composed of stocks listed on the Shanghai Stock Exchange, with a 100% representation [1] - The industry composition of the index shows that industrials account for 27.29%, information technology for 19.47%, and materials for 12.23%, among others [2] Group 3 - The index samples are adjusted biannually, with changes implemented on the next trading day after the second Friday of June and December [2] - Each adjustment typically does not exceed 20% of the sample size, and weight factors are adjusted accordingly [2] - Special circumstances may lead to temporary adjustments, such as delisting or corporate actions like mergers and acquisitions [2]