Scottrade Inc. learned about the problem after being contacted by the FBI. The FBI learned of the problem while investigating other data-theft cases. The breach affects Scottrade customers who had accounts prior to February 2014. Scottrade is using AllClear ID to handle the identity theft coverage. The company also stressed a warning against Phishing, telling customers that official communications from the company would never ask about account numbers, passwords or other private information. The firm that was brought on to do the IR is unknown, but the top guess is Mandiant/FireEye.”]
Source: https://www.csoonline.com/article/2988955/4-6m-customers-impacted-by-scottrade-breach.html