据了解，上证中央企业50指数从实际控制人为国务院国资委以及财政部控股的上市公司中，选取过去一 年日均总市值和日均成交金额排名前50名的上市公司证券作为指数样本，以反映最具代表性的央企上市 公司证券的整体表现。该指数以2008年12月31日为基日，以1000.0点为基点。 从指数持仓来看，上证中央企业50指数十大权重分别为：招商银行（11.04%）、长江电力（7.04%）、 中信证券（5.83%）、工商银行（5.26%）、交通银行（4.15%）、农业银行（3.94%）、中芯国际 （3.63%）、京沪高铁（3.29%）、中国神华（2.55%）、中国建筑（2.42%）。 金融界7月25日消息，上证指数下跌0.33%，上证中央企业50指数 (上证央企，000042)下跌0.72%，报 1806.12点，成交额936.34亿元。 数据统计显示，上证中央企业50指数近一个月上涨2.24%，近三个月上涨6.69%，年至今上涨2.24%。 资料显示，指数样本每半年调整一次，样本调整实施时间分别为每年6月和12月的第二个星期五的下一 交易日。除非老样本因上市公司实际控制人变更导致的调整比例超过10%，原则上每次调整比例不超过 ...

Core Viewpoint - The Shanghai Central Enterprises 50 Index has shown a mixed performance in the A-share market, with a recent increase of 0.58% and a year-to-date rise of 0.23% [1] Group 1: Index Performance - The Shanghai Central Enterprises 50 Index closed at 1793.77 points with a trading volume of 50.014 billion yuan [1] - Over the past month, the index has increased by 3.13%, and over the last three months, it has risen by 4.89% [1] Group 2: Index Composition - The index comprises the top 50 listed companies controlled by the State-owned Assets Supervision and Administration Commission and the Ministry of Finance, based on average market capitalization and trading volume [1] - The index was established on December 31, 2008, with a base value of 1000.0 points [1] Group 3: Top Holdings - The top ten weighted companies in the index are: China Merchants Bank (11.7%), Yangtze Power (7.46%), CITIC Securities (5.48%), Industrial and Commercial Bank of China (5.43%), Bank of Communications (4.36%), Agricultural Bank of China (3.85%), SMIC (3.48%), Beijing-Shanghai High-Speed Railway (3.39%), China Shenhua Energy (2.7%), and China State Construction Engineering (2.46%) [1] Group 4: Sector Allocation - The sector distribution of the index holdings is as follows: Financials (42.21%), Industrials (21.88%), Utilities (11.17%), Energy (7.62%), Communication Services (6.50%), Information Technology (5.00%), Materials (3.24%), Consumer Discretionary (1.20%), and Real Estate (1.18%) [2] Group 5: Sample Adjustment Rules - The index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December [2] - New samples ranked within the top 40 are prioritized for inclusion, while existing samples ranked within the top 60 are favored for retention [2]