Xin Hua Cai Jing·2025-05-21 07:35Group 1 - The Sci-Tech Innovation 50 Index opened slightly lower on May 21, fluctuated throughout the day, and closed at 995.49 points, down 0.22% with a trading volume of approximately 17.38 billion yuan [1] - The overall performance of the Sci-Tech Innovation Board remains relatively active, with 29 stocks reaching new highs since 2025, 77 stocks hitting new highs in the last 30 trading days, and 89 stocks in the last 20 trading days [1] - On May 21, the average decline of 587 stocks on the Sci-Tech Innovation Board was 0.60%, with an average turnover rate of 2.11% and a total trading volume of 73.81 billion yuan [2] Group 2 - In terms of individual stock performance, Sangfor Technologies saw a significant increase of 19.99%, while Liyang Chip experienced a notable decline of 11.12% [3] - Semiconductor and environmental protection stocks had the largest declines, while the medical and healthcare sector showed mixed performance [2] - In terms of trading volume, SMIC had the highest trading volume at 1.675 billion yuan, while Yucheng Intelligent had the lowest at 365,570 yuan [4] Group 3 - Hanbang Technology had the highest turnover rate at 34.54%, while Longteng Optoelectronics had the lowest at 0.11% [5]