Jack in the Box Inc. is a restaurant company that operates and franchises through Jack in the Box quick-service restaurants, and is one of the nation's largest hamburger chains. Jack in the Box has become the largest hamburger chains. On the basis of number of restaurants, the company's top 10 markets comprise more than 65% of the total system. Jack in the Box is also the second largest QSR hamburger chain in nine of those 10 markets. The company acquired eight franchise restaurants. Jack in the Box system includes more than 2,000 restaurants across the western and southern United States and Guam. The company had a huge number of franchised restaurants.