沪深300航天国防指数报9331.96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 9331.96 points [1] - The CSI 300 Aerospace and Defense Index has decreased by 3.97% in the past month, 3.20% in the past three months, and 9.47% 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 [1] Group 2 - The CSI 300 Aerospace and Defense Index has a market share of 58.33% from the Shanghai Stock Exchange and 41.67% from the Shenzhen Stock Exchange [1] - The index's holdings are entirely 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]