The Immigration and Nationality Act authorizes a set number of visas to be issued annually. In total, this statutorily defined number is 140,000 employment-based immigrant visas per year. Most employment-based permanent residence petitions require applicants to submit Form I-140 to U.S. Citizenship and Immigration Services (USCIS).
Available visas are divided among five preference categories. Below is a general introduction to these categories.
EB1(a) Extraordinary Ability Green Card
EB1(b) Outstanding Professor / Researcher Green Card
EB1(c) Multinational Manager/Executive Green Card
EB2 National Interest Waiver Green Card
EB3 PERM Green Card
EB4 PERM Green Card