Group 1 - The core viewpoint of the news is that the China Securities Index for Communication Services has shown a recent decline despite positive performance over the past month, three months, and year-to-date [1] - The China Securities Index for Communication Services opened high but fluctuated, closing down 0.31% at 7262.92 points with a trading volume of 55.668 billion yuan [1] - Over the past month, the index has increased by 8.24%, by 15.96% over the last three months, and by 7.74% year-to-date [1] Group 2 - The index consists of selected listed companies that meet certain liquidity and market capitalization criteria, reflecting the overall performance of representative and investable securities in the industry [1] - The index is based on a reference date of December 31, 2004, with a base point of 1000.0 [1] - The top ten weighted companies in the index include NewEase (7.56%), Zhongji Xuchuang (7.5%), China Telecom (6.78%), ZTE Corporation (6.26%), China Mobile (5.91%), China Unicom (4.91%), Focus Media (4.56%), Unisplendour (2.82%), Tianfu Communication (2.29%), and Zhongtian Technology (2.24%) [1] Group 3 - The market composition of the index shows that 65.66% of the holdings are from the Shenzhen Stock Exchange, while 34.34% are from the Shanghai Stock Exchange [1] - The index holdings are entirely composed of the communication services sector, with a 100% allocation [1] Group 4 - The index sample is adjusted every six months, specifically on the next trading day after the second Friday of June and December [2] - Weight factors are adjusted in accordance with the sample adjustments, which are generally fixed until the next scheduled adjustment [2] - Temporary adjustments occur when the China Securities Index undergoes sample changes, and special events affecting sample companies may lead to corresponding adjustments in the index [2]