Koch Supply & Trading, an affiliate of Koch Industries, is a chain of companies that serves customers worldwide. The chain trades and provides risk management services in crude oil, refined petroleum products, and natural gases and liquids. It also deals in steel, power, energy, industrial metals and financial instruments. In addition, Koch Supply & Trading owns and operates a refinery in Rotterdam in the Netherlands. Koch Industries is one of the largest private companies in the United States. The parent company owns and operates several business units that are engaged in the refining, chemical, minerals, fertilizer, polymers, fibers and financial sectors. It has operations in more than 55 countries and a work force of over 65,000 employees.