Heilongjiang Interchina Water Treatment's (SHA:600187) stock fluctuated by more than 12% over the past three consecutive trading days, according to a Tuesday filing with the Shanghai bourse.
The stock fluctuation came after the company was subjected to a delisting risk warning, and the bourse capped the fluctuation limit to 5%.
The sewage treatment company's operating revenue unrelated to the main business was less than 300 million, the filing said.
Shares closed 5% higher on Tuesday.