沪深300航天国防指数报9250.77点，前十大权重包含中航机载等

Group 1 - The Shanghai Composite Index opened lower but rose later, with the CSI 300 Aerospace and Defense Index reported at 9250.77 points [1] - The CSI 300 Aerospace and Defense Index has decreased by 5.27% in the past month, 5.06% in the past three months, and 10.26% 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 for analytical purposes [1] Group 2 - The CSI 300 Aerospace and Defense Index has a market share distribution of 58.24% from the Shanghai Stock Exchange and 41.76% from the Shenzhen Stock Exchange [1] - The index's holdings are entirely concentrated in the aviation sector, with a 100.00% allocation [1] Group 3 - The index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December [2] - Weight factors are generally fixed until the next scheduled adjustment, but can change with temporary adjustments due to special events affecting sample companies [2] - Companies that are delisted or undergo mergers, acquisitions, or splits will be handled according to specific calculation and maintenance guidelines [2]