Asos chief executive Nick Robertson said the UK performance was “encouraging” and that full year profits are expected to be in line with expectations.
The group’s total retail sales advanced 31% to £141M as international sales rose 42%.
US sales jumped 65%, while revenue from the EU increased 22% and increased 53% in the rest of the world. International business made up 65% of Asos’ sales, a rise from 60% last year.
Asos’ active customers passed the five million mark over the quarter.
Robertson said: "I am pleased to report that trading for the three months to 31 August 2012 has been strong. Retail sales for the year to 31 August 2012 increased 38% to £538M.
"Our UK performance was encouraging at +15%, and our International business grew by +42%. Our sales performance in those markets where we have a website continue to outperform. Despite investing in our pricing, I'm pleased to say that our retail gross margin improved by 70bps over the period.
"Profit for the five months ended 31 August 2012 and pro forma full year, are expected to be in line with expectations, and we approach our new financial year with continued confidence."