When is a stock too good to be true? According to the U.S. Securities and Exchange Commission (SEC), it could be when that stock soars over 900% in just half a month.By completing this form, you agree to receive marketing communications from PYMNTS and to the sharing of your information with our sponsor, if applicable, in accordance with our Privacy Policy and Terms and Conditions .Complete the form to unlock this article and enjoy unlimited free access to all PYMNTS content — no additional logins required. ...