ISS shares were down as much as 11 percent after the data, which was first reported by the South China Morning Post newspaper.
According to the information, the ISS company ISS Eastpoint was responsible for property management in the residential complex and was thus involved in the renovation project and was aware of deficiencies in fire safety.
An investigation can be expensive, lengthy and bring uncertainty and a high risk premium, says Per Hansen, economist at Nordnet, according to Bloomberg.
At least 156 people died in the catastrophic fire and 30 people are still missing, according to authorities in Hong Kong.
