Also known as the Financial Industry Regulatory Authority's (FINRA) Uniform Application for Securities Industry Registration or Transfer. A form used by broker-dealers to register associated persons with FINRA and in other applicable jurisdictions and self-regulatory organizations. The information on the form is filed with Central Registration Depository, FINRA's central licensing and registration system.

FINRA Rule 1010(c) contains the Form U4 filing requirements. The form can be found on the FINRA website along with instructions for completing it.