Revenues at online fashion retailer Asos broke through £1bn in the last four months of the decade, helped by a record Black Friday.
Retail sales hit £1.07bn in the period which ended on New Year's Eve.
Total group revenue, which includes sales from third parties, rose to £1.11bn.
Both measures were 20 per cent up on the previous year.
The firm, which has its main warehouse in Barnsley, said it had managed to "rebuild customer momentum", especially during its best Black Friday on record.
Chief executive Nick Beighton said: "Asos has delivered an encouraging start to the year. Strong customer acquisition activity, supported by robust operational performance, has driven good momentum in all our markets."
Asos kept its outlook for the full year unchanged, and said it will focus on retaining new customers who have started using its website.
The UK, while still the most important single market for the company, lost some of its revenue share.
UK retail sales hit almost £409m, 18 per cent up on the year before, but international retail sales jumped by 22 per cent, including a 23 per cent increase in the US.
The UK's share of retail sales was 38 per cent, down from nearly 39 per cent a year earlier.
"As we said in October, the focus for this year is to further enhance our capabilities and leverage the investments we have made," said Mr Beighton.
The company shipped 27.7 million orders in the four months, a 20 per cent rise on the same period in 2018. Meanwhile, 23 per cent more visits to its website were clocked up.
EU retail sales rose 21 per cent to £332.5m.
Mr Beighton added: "We remain confident in our ability to capture the substantial opportunity ahead of us."