Haohua Chemical Science & Technology (SHA:600378) flagged an abnormal stock fluctuation for three consecutive trading days, but its operations remain normal, according to a Shanghai bourse filing on Thursday.
The Chinese chemical manufacturer's closing stock price exceeded 20% the bourse's threshold between June 29 and July 1.
The company said that it does not have any significant announcement that could affect its stock.
The company's shares jumped 8% during the morning trade.