Martin Marietta Materials, Inc.

Martin Marietta Materials, Inc. is a leading natural resource-based building materials company. The company supplies aggregates, which include crushed stone, sand, and gravel, through a network of approximately 400 quarries, mines, and distribution yards located in 28 states, Canada, and The Bahamas. In 2025, aggregates accounted for 88% of the company's total reportable segment gross profit. As of December 31, 2025, Martin Marietta also provides other building materials such as cement, ready mixed concrete, asphalt, and paving services in specific markets where it has a strong aggregates presence. These heavy-side building materials are utilized in infrastructure, nonresidential, and residential construction projects. Aggregates are also used in agricultural, utility, environmental applications, and as railroad ballast. The aggregates, cement, ready mixed concrete, asphalt, and paving operations are collectively reported as the "Building Materials business." The company also operates a Specialties business, formerly known as the Magnesia Specialties business, with production facilities in Michigan, Ohio, Nevada, North Carolina, Indiana, and Pennsylvania. This segment produces high-purity natural and synthetic magnesia-based products, including magnesium sulfate, magnesium oxide, and magnesium hydroxide, which are used in environmental, industrial, agricultural, construction, consumer, and specialty applications. The Specialties business also produces dolomitic lime, primarily sold to external customers for steel production and soil stabilization, and used internally as a raw material for synthetic magnesia production. Specialties' products are shipped to customers domestically and worldwide. The company was formed in 1993 as a North Carolina corporation and completed its initial public offering in 1994, with all common stock becoming publicly traded in 1996. Since its initial public offering, the company has completed over 100 acquisitions and several strategic dispositions.