Martin Marietta Materials is a natural resource-based building materials company. Co. supplies aggregates (crushed stone, sand and gravel) through its network of quarries, mines and distribution yards. Co. also provides cement and downstream products, namely, ready mixed concrete, asphalt and paving services. Co. conducts its Building Materials business through two segments: East Group and West Group. The East Group provides aggregates and asphalt products only. The West Group provides aggregates, cement and downstream products. Co.'s Magnesia Specialties business is reported as a separate segment, which includes its magnesia-based chemicals and dolomitic lime businesses.

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