Under Armour said it was working with data security firms and law enforcement, but did not provide details on how the hackers got into its network or pulled out the data without getting caught. Larger hacks included 3bn Yahoo accounts compromised in 2013 and credentials for more than 412 million users of adult websites run by California-based FriendFinder Networks Inc in 2016. The data breach is the largest this year and one of the top five to date, based on the number of records compromised, according to SecurityScorecard, a risk management consultancy. It was founded in 2005 by brothers Mike and Albert Lee.

The app allows customers to monitor their calorie intake and measure it against the amount of exercise they are doing using a database of more than 2 million foods. Our investigation into this matter is ongoing.” Under Armour said: “We do not know the identity of the unauthorised party. The breach was not discovered until 25 March and users were informed four days later. The company said on Thursday that the accounts were compromised in February, sending shares of the company down 3% in after-hours trade.

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