Smashburger is an American fast-casual hamburger restaurant chain founded in Denver, Colorado, the chain serves "smashed" burgers using a specialized process of cooking them on a flattop grill at a high heat. As of February 2018, it has more than 370 corporate and franchise-owned restaurants in 37 states and 9 countries.
Wendy's is an American international fast food restaurant chain founded by Dave Thomas on November 15, 1969, in Columbus, Ohio. As of December 31, 2018, Wendy's was the world's third-largest hamburger fast-food chain with 6,711 locations.
Burger King (BK) is an American multinational chain of hamburger fast food restaurants. Headquartered in Miami-Dade County, Florida, as of December 31, 2018, Burger King reported it had 17,796 outlets in 100 countries, nearly half of these are located in the United States.