Citigroup was apparently hit harder by a cyber-attack in May than what was originally reported; which is now 360,000 of its customers.  Unfortunately, this number is double the number that Citigroup initially stated.

Citigroup is one of the biggest banks in the US and ranks number 3 overall.  The breach occurred on May 10^th and was confirmed by Citigroup on June 8th^th.  That said, around 360,080 North American Citigroup credit card accounts were impacted by the breach, Citigroup stated; which is around 1 per cent of their North American card customer’s base.

However, Citigroup’s annual report shows the total credit card holders to be around 21 million which is probably where the 200,000 came from. Citigroup has already alerted customers and sent new credit cards to those affected.