What is Unique Entity Identifier (UEI)?

In the context of doing business with the federal government, a Unique Entity Identifier (UEI). A UEI is a unique 12-character, alpha-numeric value. You will receive a UEI when you register with SAM at SAM.gov. Entities doing business with the federal government must use the UEI created by the system. Learn more about basic requirements for small businesses before competing for government contracts.