Group 1 - The Shanghai Composite Index opened lower but rose later, while the China Securities Public Utilities Index fell by 0.26% to 2486.53 points with a trading volume of 9.421 billion yuan [1] - The China Securities Public Utilities Index has decreased by 1.23% over the past month, increased by 0.59% over the past three months, and has declined by 3.17% year-to-date [2] - The top ten weights in the China Securities Public Utilities Index are: Changjiang Electric Power (15.15%), China Nuclear Power (10.46%), Three Gorges Energy (8.35%), Guodian Power (5.66%), State Power Investment (4.81%), Chuanwei Energy (4.29%), Yongtai Energy (4.2%), Huaneng International (4.15%), China General Nuclear Power (3.92%), and Zhejiang Energy Power (2.8%) [2] Group 2 - The China Securities Public Utilities Index consists entirely of public utility companies, with a sample adjustment occurring every six months [3] - The market share of the China Securities Public Utilities Index is 83.15% from the Shanghai Stock Exchange and 16.85% from the Shenzhen Stock Exchange [2] - Adjustments to the index sample occur on the next trading day following the second Friday of June and December each year, with weight factors generally remaining fixed until the next scheduled adjustment [3]

Group 1 - The A-share market showed mixed performance with the China Securities Public Utilities Index down by 0.39% closing at 2494.68 points and a trading volume of 8.457 billion [1] - Over the past month, the China Securities Public Utilities Index has decreased by 0.01%, increased by 5.61% over the last three months, and has declined by 2.47% year-to-date [1] - The index is designed to reflect the overall performance of different industry companies within the China Securities 800 Index, categorized into 11 primary and 35 secondary industries [1] Group 2 - The top ten holdings in the China Securities Public Utilities Index include: Changjiang Electric Power (16.87%), China Nuclear Power (10.59%), and Three Gorges Energy (8.41%) among others [1] - The market composition of the index shows that 84.49% of the holdings are from the Shanghai Stock Exchange and 15.51% from the Shenzhen Stock Exchange [1] - The public utilities sector accounts for 100.00% of the index's holdings [2] 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 events affecting the index [2] - Special events such as delisting, mergers, or changes in industry classification will prompt corresponding adjustments to the index samples [2]