Group 1 - Three A-share listed companies, Yuanwanggu (002161.SZ), Keanda (002972.SZ), and Zhonglan Environmental Protection (300854.SZ), received warning letters from the Shenzhen Securities Regulatory Bureau for shareholder reduction violations [1][2] - Yuanwanggu's controlling shareholder, Xu Yusuo, failed to stop trading when the combined shareholding with concerted actors reached a multiple of 5% on August 6, 2025, leading to a warning letter [1] - Keanda's controlling shareholder, Guo Fengming, did not timely report and announce when the combined shareholding with concerted actors reached a multiple of 5% on May 29, 2025, resulting in a warning letter [1] - Zhonglan Environmental Protection's Liu Qingsong also failed to report and stop trading when his shareholding fell to a multiple of 5% on July 21, 2025, leading to a warning letter [2]