The online fashion retailer says it is making progress in its turnaround efforts but it will not be enough to arrest declining revenues in its current financial year.
Stock prices in London were lower at midday Wednesday, as investors eye two key interest rates from the US Federal Reserve and the Bank of England.
The Fed will announce its interest rate decision.
Asos PLC on Wednesday said its full year loss widened as revenue fell by double digits, but said it expects a slow return to growth.
Shares in Asos fell 11% to 353.60 pence each in London on.