Group 1 - The Shenzhen Stock Exchange implemented self-regulatory measures on 137 instances of abnormal securities trading from May 26 to May 30, involving behaviors such as price manipulation and false declarations [1] - The exchange continues to monitor stocks on the risk warning board, including "*ST Yushun (002289)", which exhibited abnormal price fluctuations [1] - Two cases suspected of illegal activities were reported to the China Securities Regulatory Commission [1]

Group 1 - The Shanghai Stock Exchange has taken regulatory measures such as written warnings against 241 cases of abnormal trading behaviors including price manipulation and false declarations [1] - Stocks under risk warning for delisting, such as *ST Jinguang, and those with severe abnormal fluctuations like Zhongyida, are under key monitoring [1] - The exchange has conducted special investigations into 25 major events of listed companies and reported 3 suspected illegal cases to the China Securities Regulatory Commission [1]