Programs that require a sponsorship of the U.S. employer vs. programs that can be applied for independently

To sum up, the following preference categories do not require a sponsorship of the U.S. employer and foreign professionals can petition the USCIS for a green card independently:

EB-1A

EB-2 only if National Interest Waiver is obtained

EB-4

A secured job offer from a U.S. employer is required if applying for a green card under the following categories:

EB-1B

EB-1C

EB-2

EB-3