Coinbase (COIN.US) is attacked by hackers and may face losses of up to $400 million. The stock price has dropped by 7.4% at one point.

According to the Securities Times app, Coinbase (COIN.US) fell as much as 7.4% on Thursday, but as of the time of publication, the stock has narrowed its losses to 4.48%. The company disclosed a serious data breach that could result in losses of up to $400 million.