The vast majority of firms have fewer than 500 employees.

Question

The vast majority of firms have fewer than 500 employees.

Answer 1

"In 2012, according to U.S. Census Bureau data, there were 5.73 million employer firms in the U.S. Firms with fewer than 500 workers accounted for 99.7 percent of those businesses."  -- SBE Council

Answer 2

Depends on definition of vast, I suppose. But this is generally true because it's often cited by political candidates at election time--even by the most uninformed and bombastic ones who like to disparage  many groups of prospective voters.