AMEC(SH:688012) Sou Hu Cai Jing·2025-07-07 14:11Group 1 - The core index of the Shanghai National New Science and Technology Board State-owned Enterprises Index (950253) closed at 998.75 points, with a trading volume of 11.192 billion yuan, reflecting a mixed performance among the three major A-share indices [1] - The index has increased by 3.35% over the past month, 1.34% over the past three months, and 2.55% year-to-date [1] - The index is composed of state-owned enterprises listed on the Science and Technology Innovation Board or companies with state capital participation without actual controllers, with a base date of December 30, 2022, set at 1000.0 points [1] Group 2 - The top ten weighted stocks in the index include Huahai Qingke (5.89%), Huaron Micro (5.17%), SMIC (4.98%), Haiguang Information (4.91%), Western Superconducting (4.87%), Huahong Semiconductor (4.68%), Zhongwei Company (4.56%), Guodun Quantum (3.52%), Jinghe Integration (3.37%), and Zhongke Star Map (3.04%) [1] - The index's holdings are entirely from the Shanghai Stock Exchange, with a 100% allocation [1] Group 3 - In terms of industry composition, the index's sample shows that Information Technology accounts for 54.75%, Industry for 28.85%, Materials for 8.97%, Communication Services for 5.12%, and Healthcare for 2.32% [2] - The index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December each year [2] - Weight factors are generally fixed until the next scheduled adjustment, with special circumstances allowing for temporary adjustments [2]