IRAY TECHNOLOGY(688301) 搜狐财经· Sou Hu Cai Jing·2025-06-04 08:44Group 1 - The core viewpoint of the article highlights the performance of the Shanghai Stock Exchange Sci-Tech Innovation Board Medical Index, which has shown a 4.01% increase over the past month, a 0.74% decrease over the past three months, and a 1.94% increase year-to-date [1] - The index consists of no more than 30 listed companies in the medical field selected from the Sci-Tech Innovation Board, reflecting the overall performance of medical listed companies [1] - The index was established with a base date of December 30, 2022, and a base point of 1000.0 [1] Group 2 - The top ten weighted companies in the index include: Huitai Medical (10.98%), United Imaging (10.82%), Aibo Medical (6.74%), Yirui Technology (6.5%), Nanwei Medical (5.36%), Shengxiang Biology (4.94%), Xinmai Medical (4.68%), Haier Biomedical (4.22%), Yahui Long (3.6%), and Aohua Endoscopy (3.4%) [1] - The index's holdings are entirely composed of companies listed on the Shanghai Stock Exchange, with a 100.00% share [1] - The industry composition of the index holdings includes 45.00% in medical consumables, 33.89% in medical devices, and 21.10% in in vitro diagnostics [1] Group 3 - The index sample is adjusted quarterly, with adjustments implemented on the next trading day following the second Friday of March, June, September, and December [2] - Weight factors are adjusted in accordance with the sample adjustments, which occur at the same time as the sample adjustments [2] - In special circumstances, the index may undergo temporary adjustments, such as when a sample company is delisted or undergoes mergers, acquisitions, or splits [2]