When filing alphabetically, if the name of a company is the persons name, as in, John Doe Construction, should it be filed under the first name or the last name?

John Doe Construction is a name of a company so it's on the "J" now the owner of the company "John Doe" would be under "D"

The 12 Filing Rules (http://www.educ.uidaho.edu/bustech/Information_Systems/Intermediate/12_filing_rules.htm)

Hope this helps.