Martin Marietta Materials, Inc. is a natural resource-based building materials company. The Company is a supplier of building materials, including aggregates, cement, ready mixed concrete and asphalt. It supplies aggregates (crushed stone, sand and gravel) through its network of approximately 350 quarries, mines and distribution yards in 28 states, Canada and The Bahamas. It also provides cement and downstream products, namely, asphalt and paving services, in markets that are naturally vertically integrated. The Company conducts its Building Materials business through two segments, such as East Group and West Group. The East Group provides aggregates and asphalt products. The West Group provides aggregates, cement, downstream products and paving services. The Company’s Magnesia Specialties business produces high-purity magnesia and dolomitic lime products used globally in environmental, industrial, agricultural and specialty applications. It is also an aggregate's producer in Colorado.