"Family businesses are an often overlooked form of ownership. Yet they are all around us—from neighborhood mom-and-pop stores and the millions of small and midsize companies that underpin many economies to household names such as BMW, Samsung, and Wal-Mart Stores. One-third of all companies in the S&P 500 index and 40 percent of the 250 largest companies in France and Germany are defined as family businesses, meaning that a family owns a significant share and can influuence important decisions, particularly the election of the chairman and CEO."
Source: McKinsey & Company