迪安诊断跌2.01%，成交额1.21亿元，主力资金净流出2269.71万元

Group 1 - The core viewpoint of the news is that Dian Diagnostics has experienced a decline in stock price recently despite a significant increase in its stock price year-to-date, indicating potential volatility in the market [1][2]. - As of September 16, Dian Diagnostics' stock price was 17.02 yuan per share, with a market capitalization of 10.637 billion yuan and a trading volume of 1.21 billion yuan [1]. - The company has seen a year-to-date stock price increase of 53.25%, but it has experienced a slight decline of 1.45% over the last five trading days [1]. Group 2 - Dian Diagnostics operates in the pharmaceutical and biological industry, specifically in medical services and diagnostic services, and is associated with several concept sectors including Huawei and Alibaba [2]. - For the first half of 2025, Dian Diagnostics reported a revenue of 4.936 billion yuan, a year-on-year decrease of 20.61%, and a net profit of 10.2772 million yuan, down 85.68% compared to the previous year [2]. - The company has distributed a total of 1.099 billion yuan in dividends since its A-share listing, with 712 million yuan distributed over the past three years [3]. Group 3 - As of June 30, 2025, the number of shareholders for Dian Diagnostics was 48,300, a decrease of 11.32% from the previous period, while the average number of circulating shares per person increased by 12.77% to 10,376 shares [2]. - The top ten circulating shareholders include Hong Kong Central Clearing Limited as the second-largest shareholder, increasing its holdings by 3.4713 million shares [3]. - The company has seen changes in institutional holdings, with some funds increasing their positions while others have exited the top ten shareholders list [3].