Martin Marietta to Acquire Lhoist North America in $13.5B Deal
Martin Marietta Materials announced a $13.5 billion cash-and-stock deal to combine with Lhoist North America, a subsidiary of Belgium-based Lhoist Group.
Martin Marietta Materials (NYSE: MLM) announced Sunday it has signed a definitive agreement to acquire Lhoist North America, a subsidiary of the global Lhoist Group, in a $13.5 billion transaction structured as a combination of cash and Martin Marietta common stock. The Raleigh, N.C.-based building materials giant disclosed the deal June 29, 2026, marking one of the largest consolidation moves in the North American construction materials sector in recent memory.
Lhoist North America is a major producer of lime and limestone-based products used across steel manufacturing, environmental applications, and infrastructure construction — businesses that align closely with Martin Marietta's existing aggregates and heavy-materials portfolio. The combination would significantly expand Martin Marietta's operational footprint and product offerings across the continent, deepening its position in markets where lime and limestone demand is expected to grow alongside infrastructure investment.
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The transaction is subject to customary regulatory approvals and is expected to close in the second half of 2026. Antitrust scrutiny could be a factor given the scale of the deal and the overlapping materials markets in which both companies operate, though neither party commented specifically on regulatory strategy in the announcement.
For Martin Marietta shareholders, the deal represents a substantial capital commitment that will be funded through a blend of cash and newly issued stock. Investors will be watching closely for details on financing terms, potential dilution, and how management plans to integrate Lhoist North America's operations without disrupting the company's earnings trajectory in an already competitive year for construction materials demand.
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