Martin Marietta Materials, Inc. (Martin Marietta) is a natural resource-based building materials company.
The company supplies aggregates (crushed stone, sand and gravel) through its network of approximately 390 quarries, mines and distribution yards in 28 states, Canada and The Bahamas.
Martin Marietta also provides cement and downstream products, namely, ready mixed concrete, asphalt and paving services, in targeted markets where the company has a leading aggregates position. The company’s h...
Martin Marietta Materials, Inc. (Martin Marietta) is a natural resource-based building materials company.
The company supplies aggregates (crushed stone, sand and gravel) through its network of approximately 390 quarries, mines and distribution yards in 28 states, Canada and The Bahamas.
Martin Marietta also provides cement and downstream products, namely, ready mixed concrete, asphalt and paving services, in targeted markets where the company has a leading aggregates position. The company’s heavy-side building materials are used in infrastructure, nonresidential and residential construction projects. Aggregates are also used in agricultural, utility and environmental applications and as railroad ballast. The aggregates, cement, ready mixed concrete, asphalt and paving operations are reported collectively as the ‘Building Materials business’. The company also operates a Magnesia Specialties business with production facilities in Michigan and Ohio. The Magnesia Specialties business produces magnesia-based chemical products that are used in industrial, agricultural and environmental applications. It also produces dolomitic lime sold primarily to customers for steel production and soil stabilization. Magnesia Specialties’ products are shipped to customers domestically and worldwide.
Segments
The company conducts its Building Materials business through two segments, organized by geography: 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 is reported as a separate segment and includes its magnesia-based chemicals and dolomitic lime businesses.
Building Materials Business
The profitability of the Building Materials business, which serves customers in the construction marketplace, is sensitive to national, regional and local economic conditions and construction cyclicality, which are in turn affected by fluctuations in levels of public-sector infrastructure funding; interest rates; access to capital markets; and demographic, geographic, employment and population dynamics. The heavy-side construction business is conducted outdoors, as are much of the Building Materials business’ operations. Therefore, erratic weather patterns, seasonal changes and other weather-related conditions, including precipitation, flooding, hurricanes, snowstorms, extreme temperatures, wildfires, earthquakes and droughts, can significantly affect production schedules, shipments, costs, efficiencies and profitability.
The Building Materials business markets its products primarily to the construction industry, with 37% of its 2024 aggregates shipments sold to customers in connection with highway and other public infrastructure projects and the balance of its shipments sold primarily to customers for nonresidential and residential construction projects.
The Building Materials business covers a wide geographic area. The ten largest revenue-generating states (Texas, North Carolina, Colorado, California, Georgia, Florida, Minnesota, Arizona, South Carolina and Iowa) accounted for 81% of the Building Materials business’ revenues in 2024.
Aggregates
Aggregates, consisting of crushed stone, sand and gravel, are an engineered, granular material that is manufactured to specific sizes, grades and chemistry for use primarily in construction applications. The company’s operations consist primarily of open pit quarries; however, the company is the largest operator of underground aggregates mines in the United States, with 14 active underground mines located in the East Group.
Generally, the distance shipments travel by truck from a given quarry is limited because the cost of transporting processed aggregates to customers is high in relation to the price of the product itself. The company’s distribution system mainly uses trucks, but also has access to rail and waterborne networks where the per-mile unit costs of transporting aggregates are lower.
The company’s distribution network moves aggregates materials from certain domestic and offshore sources via its long-haul rail and waterborne distribution network, to markets where aggregates supply is limited. The company’s rail network primarily serves its Texas, Florida, Colorado and Gulf Coast markets, while its locations in The Bahamas and Nova Scotia transport materials via oceangoing ships. The company’s strategic focus includes expanding inland and offshore capacity and acquiring distribution facilities and port locations to offload transported material. As of December 31, 2024, the company’s aggregated distribution facilities consisted of 78 yards. The company’s rail-based distribution network, coupled with the extensive use of rail service, increases its dependence on and exposure to railroad performance, including track congestion, crew availability, railcar availability, locomotive availability and the ability to negotiate favorable railroad shipping contracts. The waterborne distribution network also increases the company’s exposure to certain risks, including among other items, meeting minimum tonnage requirements of shipping contracts, demurrage costs, fuel costs, ship availability and weather disruptions. The company has long-term agreements with shipping companies to provide ships to transport its aggregates to various coastal ports.
The company generally acquires contiguous property around existing quarry locations. Such parcels can serve as buffer property or additional mineral reserves, assuming the underlying geology supports economical aggregates mining. In either instance, the acquisition of additional property around an existing quarry typically allows the expansion of the quarry footprint and extension of quarry life. Some locations having limited reserves may be unable to expand.
Due to the nature of the indigenous aggregates supply in the midwestern United States, a long-term capital focus for the company is underground limestone aggregates mines. Production costs are generally higher at underground mines than surface quarries because the depth of the aggregates deposits and the access to the reserves result in higher costs related to development, explosives and depreciation costs.
The company generally sells its aggregates upon receipt of customer orders or requests. The company generally maintains inventories of aggregates products in sufficient quantities to meet customer requirements.
Cement and Downstream Operations
Cement is the basic agent used to bind aggregates, sand and water in the production of ready mixed concrete. Similar to aggregates, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. Consequently, the cement industry is cyclical and dependent on the strength of the construction sector. As of December 31, 2024, the Company has one production facility in Midlothian, Texas, south of Dallas/Fort Worth, which produces Portland and specialty cements. Clinker is the intermediate product in cement production, and the Texas production facility has an annual clinker capacity of 2.4 million tons. The company completed a finishing capacity expansion project at the Midlothian plant in August 2024, which will provide 0.45 million tons of incremental annual cement production capacity. Further, the company has converted its Midlothian plant to manufacture a less carbon-intensive Portland limestone cement, known as Type 1L, which has been approved by the Texas Department of Transportation and allows the production of more cement with less clinker.
Calcium carbonate in the form of limestone is the principal raw material used in the production of cement. Management believes that its reserves of limestone are sufficient to permit production at its cement plant at the current operational levels for the foreseeable future.
Cement consumption is dependent on the time of year and prevalent weather conditions. According to the Portland Cement Association, nearly two-thirds of U.S. cement consumption occurs in the six months between May and October. The remainder is shipped to manufacturers of concrete-related products, contractors, materials dealers and oil well/mining/drilling companies. The company's cement operation generally delivers its products upon receipt of customer orders or requests. Inventory for products is generally maintained in sufficient quantities to meet customers' rapid delivery requirements.
Ready mixed concrete is measured in cubic yards and specifically batched or produced for customers’ construction projects and then typically transported by mixer trucks and poured at the project site. The aggregate used for ready mixed concrete is a washed material with limited amounts of fines (such as dirt and clay). As of December 31, 2024, the company operated 72 ready mixed concrete plants in Arizona and Texas. Asphalt is most commonly used in surfacing roads and parking lots and consists of liquid asphalt, or bitumen (the binding medium), and aggregates. Similar to ready mixed concrete, each asphalt batch is produced to customer specifications. As of December 31, 2024, the company operated 38 asphalt plants in Arizona, California, Colorado and Minnesota. The company also offers paving services in California and Colorado. Market dynamics for these downstream product lines include a highly competitive environment and lower barriers to entry compared with aggregates and cement.
Magnesia Specialties Business
The Magnesia Specialties business produces and sells dolomitic lime from its Woodville, Ohio facility and manufactures magnesia-based chemical products for industrial, agricultural and environmental applications at its Manistee, Michigan facility. These magnesia-based chemical products have varying uses, including flame retardants, wastewater treatment, pulp and paper production and other applications. In 2024, 59% of Magnesia Specialties’ revenues were attributable to chemical products, 40% to lime, and 1% to stone sold as construction materials.
Magnesia Specialties generally delivers its products upon receipt of customer orders or requests. Inventory for products is generally maintained in sufficient quantities to meet rapid delivery requirements of customers. Dolomitic lime products sold to external customers are used primarily by the steel industry.
The principal raw materials used in the Magnesia Specialties business are dolomitic limestone and magnesium-rich brine. Management believes that its reserves of dolomitic limestone and brine are sufficient to permit production at the current operational levels for the foreseeable future.
Patents and Trademarks
As of January 31, 2025, the company owned, had the right to use, or had pending applications for patents pending or granted by the United States and various countries and trademarks related to its business.
Customers
The company’s products are sold principally to commercial customers in private industry. Although large amounts of construction materials are used in public works projects, relatively insignificant sales are made directly to federal, state, county or municipal governments, or agencies thereof.
Acquisitions
On April 5, 2024, the company completed the acquisition of 20 active aggregates operations in Alabama, South Carolina, South Florida, Tennessee, and Virginia from affiliates of Blue Water Industries LLC (BWI Southeast).
Environmental and Governmental Regulations
The company’s cement plant and its Magnesia Specialties plants are strictly regulated with respect to GHG emissions and hold Title V Permits under USEPA regulations, and each (other than the Manistee Michigan facility) is also subject to the U.S. Clean Air Act’s Prevention of Significant Deterioration (PSD) requirements which require a permit program for certain new or modified sources of emissions.
In addition, the cement produced by the company’s cement operation, like other U.S. producers, is subject to strict limits set by the U.S. Department of Transportation (USDOT) and other agencies, including those relating to clinker substitution, or the replacement of ground clinker in cement with alternate materials such as pozzolan, slag and fly ash, which has implications for the company’s fuel use and efforts to reduce GHG emissions from its cement operations.
History
Martin Marietta Materials, Inc. was founded in 1939 as a North Carolina corporation. The company was incorporated in 1993.