McGrath has called for a trading halt to its shares, as the company reviews its forecasts.
In a statement to the Australian Stock Exchange, the company said, "it is currently reviewing the 2016 financial year prospectus forecasts in light of current market and trading conditions."
The company is expected to make an announcement before the market opens on Tuesday. The shares will remain suspended until then.
The company floated in December last year, with a $2.10 IPO price. However, the shares have drifted south ever since amid a weakening real estate sector. McGrath shares closed on Thursday at $1.30.
John McGrath is the company's largest shareholder.