It's according to the SEC: https://www.sec.gov/fast-answers/answersqaddedhtm.html Given that risk, before purchasing stock in a bankrupt company, investors should read the company's proposed plan of reorganization. Q- Who has seen the plan? A- No one. Further information: https://www.sec.gov/news/press-release/2014-243 Know that "Q" is for caution. A stock symbol with a fifth letter "Q" at the end denotes that the company has filed for bankruptcy.