According to http://www.census.gov/econ/smallbus.html, less than 1% of all businesses have more than 100 employees.

That doesn't really strike me as relevant? Many "businesses" are one or two people. Obviously "giant" is subjective but considering the largest companies are a few orders of magnitude bigger, I maintain what I said earlier: Only people who are immersed in the startup world consider Dropbox a "giant" company.

Despite having 100 employees, I wouldn't consider a chain of car washes with 20 locations and 5 people at each location to be a giant company.