东芯股份、上纬新材等被重点监控！上交所本周对253起异常交易采取监管措施

Group 1 - The Shanghai Stock Exchange (SSE) took regulatory measures against 253 cases of abnormal trading behaviors, including price manipulation and false declarations, during the week of August 18 to 22 [1] - The SSE issued warnings and suspended trading for stocks with abnormal volatility risks, such as *ST Yazhen and Dongxin Co., while closely monitoring severely abnormal stocks like Shuangwei New Materials [1] - A total of 9 regulatory letters were sent by the SSE's company supervision department, including 1 inquiry letter and 8 work letters, alongside 5 announcements requiring companies to disclose supplementary or corrected information [1] Group 2 - The SSE initiated 20 investigations into insider trading and abnormal trading in response to companies disclosing sensitive information or experiencing significant stock price anomalies [1]