https://www.vice.com/en_us/article/g5qbq4/robinhood-says-it-was-hacked-and-extorted-but-nobody-lost-any-money

Robinhoood was hacked last week by someone who socially engineered a customer service representative to gain access to the email addresses of more than 5 million customers, the full names of 2 million other customers, and other data from a much smaller group of customers, the company said in a blog post published Monday. The hacker then allegedly attempted to extort the company. 

"The unauthorized party socially engineered a customer support employee by phone and obtained access to certain customer support systems," Robinhood wrote in the blog post. "At this time, we understand that the unauthorized party obtained a list of email addresses for approximately five million people, and full names for a different group of approximately two million people."