Former Rich Lister Megan Wynne’s financial worth has plummeted after shares in the Perth entrepreneur’s international employment services group, APM Human Services International, lost nearly half of their value in one day.

APM, which specialises in helping people with disabilities or illnesses find jobs, slid 41 per cent, or 54¢, to trade at 78¢ on Thursday after it forecast first-half profit and earnings well below analysts’ expectations.