CNCEC(SH:601117) Jin Rong Jie·2025-06-26 07:38Group 1 - The Shanghai Composite Index opened lower and the CSI 300 Construction Engineering Index reported 3545.51 points, with a 2.45% increase over the past month, a 0.96% increase over the past three months, and a 5.80% decrease year-to-date [1] - The CSI 300 Index is categorized 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 Construction Engineering Index is fully composed of stocks from the Shanghai Stock Exchange, with 56.84% in infrastructure construction, 35.92% in housing construction, and 7.24% in specialized engineering [2] - The index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December, ensuring that weight factors are updated accordingly [2] - Temporary adjustments to the index samples occur when the CSI 300 Index undergoes changes, and special events affecting a sample company's industry classification will also prompt corresponding adjustments [2]