Asos reported an 83% rise in sales to £31.8 million and 700% uplift in pre-tax profits to £2.4m for the six months to September 30.
The business attributed the strong increase in profit to the gross margin improvement of 4.7 percentage points against the same period last year.
Current trading was also buoyant, with sales for the nine weeks to December 2 up 101% year-on-year. As a result, sales for the year to date are 89% ahead.
However chief executive Nick Robertson pointed out there are some big trading weeks still to come.
He said: “With several peak Christmas trading weeks and the January sale still to come, it is too early to assess whether this performance will continue for the remainder of the financial year.”
The company will release a Christmas trading statement at the end of January.