

Group 1 - The core viewpoint of the articles highlights the performance of the China Securities Hong Kong 300 Energy Index, which has seen a decline of 7.31% in the past month, 8.77% in the past three months, and 10.93% year-to-date [1] - The top ten holdings of the China Securities Hong Kong 300 Energy Index include China National Offshore Oil (41.44%), PetroChina (17.49%), China Shenhua Energy (13.95%), Sinopec (13.62%), and others, indicating a concentration in a few major companies [1] - The index is designed to reflect the overall performance of different industries in the Hong Kong market, with a base date of December 31, 2004, set at 1000.0 points [1] Group 2 - The market segments represented in the China Securities Hong Kong 300 Energy Index are entirely from the Hong Kong Stock Exchange, with fuel refining accounting for 42.01%, integrated oil and gas companies for 31.12%, and coal for 24.17% [2] - The index samples are adjusted biannually, with changes implemented on the next trading day following the second Friday of June and December, ensuring that the weight factors are updated accordingly [2] - Adjustments to the index samples occur in response to special events affecting the companies, such as mergers or delistings, ensuring the index remains reflective of the current market landscape [2]