CEO Nick Beighton said the group was well positioned to capture demand for products bought for social events and holidays when lifestyles normalised.
However, it was retaining caution on the near-term consumer outlook due to uncertainty over the financial prospects of its youthful customer base, the timing of global restrictions lifting and possible further COVID-19 spikes.
“Anything that affects 20-something lives and economics, we are mindful of and concerned,” Beighton told Reuters.
“We are still in the midst of the pandemic and we think the economic consequences are still to play out.”
Shares in the group were down 1.6% at 0915 GMT.
ASOS has traded through coronavirus lockdowns while store-based rivals have had to close shops. It also benefited from fewer products being returned by shoppers, as well as investment in products, pricing and marketing.
The group made an adjusted pretax profit of 112.9 million pounds ($155.3 million) for the six months to Feb. 28, up from 30.1 million pounds in the first half of its 2019-20 year.
Sales rose 25% at constant exchange rates to 1.98 billion pounds as its active customer base increased by 1.5 million to 24.9 million.
Beighton said he expected the consensus of analysts’ full year forecasts to rise from about 170 million pounds to 190-200 million pounds.
“The steer we will be giving is effectively, bank the overperformance in the first half and hold it flat for the second half,” he said.
In February, ASOS bought the Topshop, Topman, Miss Selfridge and HIIT brands from the administrators of Philip Green’s collapsed Arcadia group for 265 million pounds, aiming to accelerate its multi-brand strategy.
Beighton said the integration was progressing to plan and the group was “highly likely” to make more acquisitions.
($1 = 0.7268 pounds)
(Reporting by James Davey; Editing by Costas Pitas and Pravin Char)