Martin Marietta Materials

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Martin Marietta Materials is in the aggregate, chemical, and composite material business. It is the second largest producer of crushed stone, sand, and gravel in the United States. It is a leading U.S. producer of magnesia-based chemical products used as additives in applications including ceramics, paper, sugar, animal feed, and water treatment. It produces domolitic lime used as a fluxing agent by the steel industry. It is a supplier of fiber-reinforced polymer products for use in infrastructure such as panels and bridge decks and transportation components such as truck trailers and railroad cars.

It was established as an independent company in 1996, spun off from the newly created Lockheed Martin after having been part of Martin Marietta since 1961. It dates its origins back to 1939, when Superior Stone, an aggregates company in Raleigh, North Carolina, was founded. Raleigh serves as the company's corporate headquarters.

As of 2003 it employed nearly 6000 people and had sales of $1.5 billion.