In the four months to 31 December total group revenue jumped 20% to £1.1bn compared to the same period in 2018.
The online fashion retailer added “there is still much work to be done” to make the most of this “encouraging” start of the financial year.
UK retail sales rose 18% to £409mln and international were up 22% to £666mln, pushing total retail sales up 20% to £1bn.
Gross margin, however, was 1.7% lower due to planned investment to attract customers and US tax.
“The focus for this year is to further enhance our capabilities and leverage the investments we have made,” said chief executive Nick Beighton in a release.