The online fashion retailer, which also owns the PrettyLittleThing and Nastygal fashion labels, saw revenues in the four-month period jump 44% to £328.2m.
It revised its revenue growth forecast for the financial year to 43%-45%, up from a previous estimate of 38%-43%
Boohoo sells clothes, accessories and shoes for the 16 to 30-year-old market.
The company, which was founded in 2006, distributes its stock from a huge warehouse in Burnley, and claims to have more than five million customers.
Boohoo Group PLC (LON:BOO) operates as an online fashion retailer in the United Kingdom, rest of Europe, the United States, and internationally. The company also provides its products under the boohoo, boohooMAN, PrettyLittleThing, and Nasty Gal brand names.