沪深300食品指数报7270.47点，前十大权重包含海天味业等

Group 1 - The Shanghai Composite Index opened lower and the CSI 300 Food Index reported 7270.47 points, indicating a recent decline in the food sector [1] - The CSI 300 Food Index has decreased by 2.82% over the past month, 7.95% over the past three months, and 10.52% 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 a comprehensive analysis tool for investors [1] Group 2 - The CSI 300 Food Index is primarily composed of stocks from the Shanghai Stock Exchange, which accounts for 84.47%, while the Shenzhen Stock Exchange accounts for 15.53% [1] - Within the holdings of the CSI 300 Food Index, dairy products represent 61.67%, condiments and cooking oils account for 29.13%, and meat products make up 9.20% [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]