A short form for pink sheet shells (pink sheet shell companies). By definition, a pink is a type of public shell that trades on the Pink Sheets. It is not assigned a ticker symbol on an exchange and is not required to maintain current reporting status or undertake annual audits. Pink shells are often cheaper than over-the-counter bulletin board shells (OTCBB shells) because they don’t need to comply with the Penny Stock Rules promulgated by the Securities Exchange Act of 1934.