Martin Marietta Materials, Inc. is a supplier of aggregates products (crushed stone, sand, and gravel) and heavy building materials (cement) for the construction industry, including infrastructure, non-residential, residential, railroad ballast, agricultural and chemical grade stone used in environmental applications. The Company operates through three businesses: Aggregates Business, Cement Business and Magnesia Specialties Business. The Company’s Aggregates Business is engaged in mining, processing and selling granite, limestone, sand, gravel and other aggregate products. The Company’s Cement Business is engaged in producing Portland and specialty cements, such as masonry and oil well cements. The Company’s Magnesia Specialties Business includes magnesia-based chemicals and dolomitic lime businesses.