Over-the-Counter Bulletin Board, or OTCBB, is a quotation. Unlike Pink Sheets, which is just a quotation publisher, OTCBB maintains listing requirements (though they’re less stringent than those of an exchange). For this reason, OTCBB has a little bit of added legitimacy.

Pink Sheets is a system that provides investors with quotation information on stocks that are registered with it. Unlike OTCBB, however, Pink Sheets isn’t registered with the SEC and doesn’t enforce any listing requirements.