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]