The largest concrete and building materials supplier in the United States is CRH plc, operating extensively through its primary North American arm, Oldcastle Infrastructure and its associated regional materials subsidiaries. CRH commands a massive market footprint across the country, managing hundreds of ready-mix concrete plants, aggregate quarries, and asphalt production facilities. Alongside CRH, major domestic giants like Vulcan Materials Company and Martin Marietta also contend for leadership in aggregate and concrete production volumes, providing essential materials for federal highway systems and commercial construction projects nationwide.