Jiangsu Etern (SHA:600105) experienced abnormal stock fluctuations for three consecutive trading days, but the company said its operations were normal, according to a Shanghai bourse filing on Friday.
The company's closing stock price rose more than 20% between June 2 and 4, exceeding the bourse's threshold.
The company's probe found that it does not have any material changes or significant disclosure that could affect the share price.
The Chinese telecommunication cable and wire manufacturer's shares rose 3% during the afternoon trade.