Martin Marietta Materials
Martin Marietta Materials, Inc. (NYSE: MLM) operates as a leading natural resource-based building materials company serving the construction industry across North America. The company's website is www.martinmarietta.com. From the company’s description.
Margins and return on equity change in ; everything else in percent. Fewer shares and less debt are shown plainly, not as bad news — it depends what you make of buybacks. Dotted labels explain each measure. is shown separately from the annual figures.
What Martin Marietta Materials does
In the company’s own words
Martin Marietta Materials, Inc. (NYSE: MLM) operates as a leading natural resource-based building materials company serving the construction industry across North America. The company's website is www.martinmarietta.com.
The company operates through three reportable segments: the East Group and West Group, which collectively comprise the Building Materials business, and the Specialties business. In 2025, aggregates generated 88 percent of total reportable segment gross profit, establishing aggregates as the company's core product. The Building Materials business supplies crushed stone, sand, and gravel through approximately 400 quarries, mines, and distribution yards located in 28 states, Canada, and The Bahamas. The company also provides cement, ready mixed concrete, asphalt, and paving services in targeted markets. The Specialties business manufactures high-purity natural and synthetic magnesia-based products, including magnesium sulfate, magnesium oxide, and magnesium hydroxide, along with dolomitic lime, serving environmental, industrial, agricultural, construction, consumer, and specialty applications.
Martin Marietta's products are primarily used in infrastructure, nonresidential, and residential construction projects. In 2025, 37 percent of aggregates shipments were sold for highway and public infrastructure projects, with the remainder directed toward private-sector construction. The ten largest revenue-generating states—Texas, North Carolina, Colorado, California, Georgia, Florida, South Carolina, Arizona, Iowa, and Minnesota—accounted for 76 percent of Building Materials revenues from continuing operations.
The company maintains approximately 85 years of aggregates reserves based on 2025 production levels and operates the largest network of underground aggregates mines in the United States with 13 active underground mines. The company owns approximately 180,000 acres of land supporting its operations.
Founded in 1993 as successor to Lockheed Martin's materials group, Martin Marietta has completed over 100 acquisitions since its 1994 initial public offering. Recent strategic transactions include the 2024 acquisition of Albert Frei & Sons in Colorado, the 2024 sale of its South Texas cement business, and the 2024 acquisition of Blue Water Industries' Southeast aggregates operations. In 2025, the company acquired Premier Magnesia, expanding its magnesia-based product portfolio and domestic mineral reserves.
Company details
- Sector
- Materials
- Industry (SIC)
- Mining
- Headquarters
- RALEIGH, NC
- Fiscal year end
- December
- CIK
- 916076
- SIC
- 1400
Financial performance, year by year
Fiscal 2013–2025 · USDThe full income statement, balance sheet and cash flow for each of these years — every figure traceable to its filing — is on the Financials tab with a free account.
Who owns Martin Marietta Materials — and what changed
Funds as of 2026Q2 · superinvestors as of 2026-06-30
Superinvestors in Martin Marietta Materials · what they did last quarter
Share of each manager’s reported 13F portfolio. Change is in shares held, since the previous quarter.
Largest fund holders · Martin Marietta Materials’s weight in each
Fund ownership is a floor, not a census — pensions, insurers and people holding shares directly are not visible here.
Martin Marietta Materials’s bonds, as funds hold them
Funds report holding 9 issues of Martin Marietta Materials’s debt, $523.80M at market value — what funds hold, not the company’s total debt. Weighted-average coupon 3.61%, maturing 2027 to 2054.
Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.
Fund ownership is a subset of institutional 13F ownership — the two describe overlapping populations and must not be added together.
Every fund and institutional holder, quarter by quarter, is on the Ownership tab with a free account.
Recent filings
All filings →Each filing opens into its own statements and disclosures here.
Put this business in context.
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