上交所：本周对东芯股份、上纬新材等严重异常波动股票进行重点监控

Group 1 - The Shanghai Stock Exchange implemented regulatory measures such as written warnings and trading suspensions for 253 cases of abnormal trading behaviors including price manipulation and false declarations from August 18 to August 22, 2025 [1] - Stocks with abnormal volatility, such as *ST Yazhen, received risk warnings, while stocks like Dongxin Co. and Shangwei New Materials faced close monitoring due to severe abnormal fluctuations [1] - The exchange conducted special investigations into 17 significant events related to listed companies [1]