Gruma, S.A.B. de C.V., known as Gruma, is a Mexican multinational corn flour and tortilla manufacturing company headquartered in San Pedro, near Monterrey, Nuevo León, Mexico. It is the largest corn flour and tortilla manufacturer in the world. Its brand names include Mission Foods, Maseca, and Guerrero. Gruma reported revenues of US$3.8 billion for 2014. It operates more than 79 plants worldwide, mainly in Mexico, the United States, and Europe, and employs approximately 18,000 people. It is listed on the Mexican Stock Exchange since 1994, and it had a NYSE listing through ADRs from 1998 to September 2015. It is a constituent of the IPC, the main benchmark index of Mexican stocks. Wikipedia