Many of the new jobs are in new business start-ups, but a larger share come from established firms in the 20 to 499-employee range. The data show that from 1993, 31 percent of net jobs gained came from new establishments and the remaining 69 percent came from existing firms of all sizes that expanded. During this current economic downturn, firms with fewer than 20 employees began losing jobs in the early second quarter of 2007. Until the second quarter of 2009, these smallest firms accounted for 24 percent of net job losses, while the larger firms accounted for 36 percent. The remaining 40 percent were in the very largest firms of more than 500 employees. According to the Office of Advocacy at the Small Business Administration, small businesses created 65 percent of all new jobs in the private sector in the United States over the last 15 years. The data comes from a new report, “An Analysis of Small Business and Jobs”.
See the full report here: http://www.sba.gov/advo/research/rs359tot.pdf
More about the Office of Advocacy: www.sba.gov/advo.

They are the people who have created home-based businesses. They account for
more than half of all the businesses in the U.S. And they employ more people
than venture-backed companies.