Citigroup is admitting that a May hack cost cardholders millions of dollars.

On May tenth 3,400 accounts had at least $2.7 million stolen from them.  The total number of accounts that were hacked is more than 360,000.

Citi officials claim they notified customers quickly, yet those notices weren’t sent out until June 3.  So far 200,000 credit cards have been replaced by Citi.