Online stock trading platform Robinhood on Monday said a third party gained unauthorized access to its systems and made away with sensitive user data including the email addresses of five million users.Along with the five million user email addresses, the full names of some two million people were exposed in an incident that took place on Nov. 3, the company said in a blog post.Additionally, about 310 people saw more sensitive information disclosed, including name, date of birth, and zip code. More extensive account details were revealed for a subset of that group.Read more