AHMSA Announces Fourth Quarter 2018 Results Monclova, Coahuila - March 1st, 2019 - Altos Hornos de México, S.A.B. de C.V. and Subsidiaries ("AHMSA" or "the Company") (BMV: AHMSA) reported financial results for the fourth quarter period ended December 31, 2018 (4Q 2018).