上海合晶：公司股票交易连续两日涨幅超30%

Group 1 - The company Shanghai Hejing announced that its stock price experienced an abnormal fluctuation, with a cumulative increase of over 30% in closing prices over two consecutive trading days on August 12 and August 13, 2025 [1] - The company conducted a self-examination and sent a written inquiry to its controlling shareholder, confirming that there is no significant information that should have been disclosed but was not [1] - The company cautioned investors about the significant short-term volatility in its stock price and advised them to be aware of market trading risks and to make rational investment decisions [1]