I haven’t checked their methodology, but I’m not surprised by the numbers in this report from the American Small Business League:

According to the U.S. Census Bureau, 98% of all U.S. firms have less than 100 employees. Approximately 25 million firms fall into that category. These firms employ over 55% of the private sector workforce and are responsible for over 95% of all new jobs created in America. (www.asbl.com)