There are two types of keiretsu's: horizontal and vertical. The horizontal keiretsu consists of a large manufacturing company surrounded by numerous small and subservient suppliers and distributors that keep the operations running smoothly, while the vertical keiretsu consists of a group of interlocking companies, typically clustered about a lead manufacturer, a main bank, and a trading company, and overseen by a presidents' council consisting of the presidents of the major group companies.