Subsidiaries are a common feature of business life and most multinational corporations organize their operations in this way. Examples include holding companies such as Berkshire Hathaway, Jefferies Financial Group, WarnerMedia, or Citigroup; as well as more focused companies such as IBM or Xerox. These, and others, organize their businesses into national and functional subsidiaries, often with multiple levels of subsidiaries.
In the United States railroad industry, an operating subsidiary is a company that is a subsidiary but operates with its own identity, locomotives and rolling stock. In contrast, a non-operating subsidiary would exist on paper only (i.e., stocks, bonds, articles of incorporation) and would use the identity of the parent company.