Altos Hornos de México, S.A.B. de C.V. (AHMSA) is the largest integrated steelworks in the country. Its corporate offices are located in Monclova, Coahuila, in central region of the State of Coahuila, 250 kilometers from the U.S. border.

AHMSA operates a vast industrial chain, from the extraction of iron ore and coal to the manufacturing of various steels. It has two steel plants in the city of Monclova, which cover an area of 3,000 acres.

AHMSA currently operates at a rate of close to 5 million metric tons of liquid steel annually, and has a workforce of 19,000, including its mining subsidiaries.