Martin Marietta Materials, Inc. is a supplier of aggregates and other building materials. The Company provides magnesia and dolomitic lime products used globally in environmental, industrial, agricultural, and other specialty applications. It supplies aggregates (crushed stone, sand and gravel) through its network of approximately 400 quarries, mines, and distribution yards in 28 states, Canada and The Bahamas. It also provides other building materials, namely, cement, ready mixed concrete, asphalt, and paving services. Its heavy-side building materials are used in infrastructure, nonresidential and residential construction projects. Its Aggregates are also used in agricultural, utility, and environmental applications and as railroad ballast. The Company operates through two segments, which include East Group and West Group. The East Group comprises the East and Southwest divisions. The West Group comprises the Central and West divisions.