Robinhood acknowledged the leak of users' personal data, the incident occurred on November 3. "A third party has unauthorized access to a limited amount of personal information of some of our customers," according to a statement published on the Robinhood blog.
As a result of the incident, the unauthorized party received a list of email addresses for about five million people and full names for another group of about two million people. We also believe that for a more limited number of people — about 310 in total— additional personal information was disclosed, including name, date of birth and zip code, while a subgroup of about 10 customers disclosed more detailed account details.
https://blog.robinhood.com/news/2021/11/8/data-security-incident