MLM · CIK 0000916076
What Martin Marietta Materials, Inc. told the SEC could break it.
Martin Marietta's disclosures reflect a building-materials producer tied to regional construction and to the logistics and energy behind its operations. Its Building Materials revenue is geographically concentrated, with its ten largest states — led by Texas, North Carolina and Colorado — making up 76% of 2025 revenue, exposing it to those construction economies. Its Specialties lime and magnesia business consumes significant natural gas, coal and petroleum coke, with fixed-price agreements covering only about 34% of anticipated 2026 energy needs, and it relies heavily on third-party truck and rail to ship products and bring fuel to its plants, so transportation disruptions would hurt operations. Its quarrying and processing also expose it to material environmental liabilities and to changes in zoning, land-use and environmental laws.
4 self-disclosed vulnerabilities, pulled from its own filings — each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Commodity & input dependence
- Specialties fuel inputs — natural gas, coal, petroleum coke (only 34% hedged for 2026)medium
Martin Marietta's Specialties (lime/magnesia) business consumes significant natural gas, coal, and petroleum coke; results are hurt by fuel price increases or shortages, and it has fixed-price agreements for only ~34% of anticipated 2026 energy needs.
“Our Specialties business also requires significant amounts of natural gas, coal and petroleum coke, and financial results are negatively affected by increases in fuel prices or shortages. Our Specialties business has fixed-price agreements for 34% of its anticipated 2026 coal, petroleum coke and natural gas needs.”
SEC filing →As of 2026
Geographic concentration
- top ten states = 76% of Building Materials revenuemedium
Martin Marietta's Building Materials revenue is geographically concentrated — its ten largest revenue states (TX, NC, CO, CA, GA, FL, SC, AZ, IA, MN) accounted for 76% of 2025 building-materials revenue — exposing it to those regions' construction economies.
“The ten-largest revenue-generating states (Texas, North Carolina, Colorado, California, Georgia, Florida, South Carolina, Arizona, Iowa and Minnesota) accounted for 76% of the Building Materials business' revenues from continuing operations in 2025.”
SEC filing →As of 2026
Regulatory & policy
- environmental liabilities (quarrying, blasting, air/water, land use)medium
Martin Marietta's quarrying and processing operations expose it to material environmental liabilities and to changes in zoning, land-use, environmental, and health/safety laws and enforcement (noise, blasting, vibrations, air emissions, water discharges).
“Changes in laws, regulations, and enforcement practices, including zoning, land use, the environment, health and safety, as well as litigation relating to these matters, affect our businesses. Our operations expose us to the risk of material environmental liabilities.”
SEC filing →As of 2026
Supplier concentration
- third-party truck and rail transportation (for products and inbound fuel)medium
Transportation logistics are critical to Martin Marietta — it relies heavily on third-party truck and rail to ship products to customers and to bring coal, natural gas, and other fuels to its plants; delays, disruptions, or non-availability could harm operations.
“Transportation logistics play an important role in allowing us to supply products to our customers, whether by road, rail or water. We also rely heavily on third-party truck and rail transportation to ship coal, natural gas and other fuels to our plants. Any significant delays, disruptions or the non-availability of our transportation support system could negatively affect our operations.”
SEC filing →As of 2026
The hidden graph
Who it depends on, and who depends on it.
Relationships surfaced from filings — including ones disclosed by the other side, which is how the non-obvious ones come to light.
Its suppliers
“The Company's quarries are subject to mining leases with various tenants, including Vulcan Materials, Martin Marietta, Cemex, Quikrete, and The Concrete Company.”
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