The Boeing Co is a multinational corporation that designs and manufactures satellites, aircraft, rockets, munitions, missiles and telecommunication equipment. The company also offers leasing services and product support. Boeing Co ranks among the biggest global aerospace and defense manufacturers. It is consistently ranked in the top three defense contractors in the world, based on revenue. Boeing Co’s performance is tracked on the Dow Jones Industrial Average, a key industrial measure for US companies. Boeing was founded by William Boeing in Seattle, Washington, on July 15, 1916. The company's corporate headquarters are in Arlington, Virginia. Boeing is divided into four primary business units: Boeing Commercial Airplanes; Boeing Defense, Space & Security; Boeing Global Services and Boeing Capital. The company is consistently ranked in the top 50 of the Fortune 500 list of largest American companies by revenue.