 Cementos Argos is subsidiary of Inversiones Argos, which in turn belongs to a larger conglomerate called Grupo Empresarial Antioqueño based in Medellín, Colombia.Argos acquired full ownership of Southern Star Concrete in November 2005 in a purchase agreement with the former owners, Texas Growth Fund and Austin Ventures, both based in Austin, Texas.Southern Star is the largest ready-mixed concrete supplier in Texas and Arkansas, and also one of the largest ready-mix companies in the United States.