Core Insights - In December 2025, the total amount of shares sold by directors, supervisors, and senior executives of listed companies in the Shanghai and Shenzhen stock markets reached approximately 8.374 billion yuan, involving 318 companies, while the total amount of shares bought was about 624 million yuan, involving 64 companies, resulting in a net reduction of 7.75 billion yuan [2][5]. Group 1: Share Reduction - The mechanical equipment industry had the highest amount of share reductions in December, totaling approximately 1.316 billion yuan [13]. - The top three companies with the highest share reductions were Western Gold, Yingshi Sheng, and Zhiwei Intelligent, with reductions of approximately 307 million yuan, 263 million yuan, and 247 million yuan respectively [5][6]. - The total amount of share reductions in December 2025 increased by 165.29% year-on-year but decreased by 1.21% month-on-month [2]. Group 2: Share Increase - The pharmaceutical and biological industry had the highest share increases in December, totaling approximately 294 million yuan [21]. - The top three companies with the highest share increases were Mindray Medical, Zhejiang Fu Holdings, and Yixin Hall, with increases of approximately 226 million yuan, 208 million yuan, and 66 million yuan respectively [14][17]. - The total amount of share increases in December 2025 increased by 212.29% year-on-year and by 69.58% month-on-month [2].