No they are not. Around 20% of all new cars sold are "fleet cars" that is, owned by companies not people. Of them, most are bought by lease providers to be leased by individuals - so they aren't "really" company cars, or bought by rental companies again, to be rented out to individuals. Under 10% are really "company cars" in the true sense - "bought by companies to be used by their employees for jobs like delivery, business trips, etc".