Other forms: holding companies
A holding company is a corporation that doesn't produce or sell anything, but makes its money from owning shares of other businesses.
Holding companies, which are sometimes called "parent companies," control the assets of other companies, known as subsidiaries. Though they hold financial control of these businesses (and make a lot of money from them), they generally don't make any day-to-day decisions in running them. Most well-known companies, from Dairy Queen to Apple, are at least partly owned by holding companies.