The stats

In the USA there are:

5,000,000 total businesses *

4,995,000 privately held **

4,715,000 small businesses***

4,450,000 business employ fewer than ten people

Of the 180,000,000 people employed…

90,000,000 are employed by the 4,995,000 privately held businesses.

These numbers are rounded for simplicity.
* Note, this excludes solo businesses with one employee
** I have included the approximately 10,000 thinly, or not traded OTC stocks.
*** This includes businesses with more than 10 but less than 100 employees.
https://www.sba.gov/sites/default/files/advocacy/2018-Small-Business-Profiles-US.pdf
https://en.wikipedia.org/wiki/Wilshire_5000
https://www.bls.gov/bdm/entrepreneurship/bdm_chart7.htm
https://www.bls.gov/bdm/bdmfirmsize.htm
https://www.sba.gov/advocacy/firm-size-data