Martin Marietta Materials announced on Monday a $13.5 billion deal to acquire Lhoist North America, a supplier of limestone and key components for steelmaking.
It's significant for a company with a market value of less than $40 billion. Wall Street isn't quite sure what to make of it.
Martin Marietta stock was down 4% in early trading at $585.29; the S&P 500 and Dow Jones Industrial Average rose 0.8% and 0.3%, respectively.
Investors are a little nervous in part because the deal isn't for aggregates, a component in cement manufacturing. The aggregate business is characterized by high local market share, stable pricing, and solid profit margins.
Positive industry dynamics are one reason Martin Marietta and Vulcan Materials trade at about 26 times and 28 times estimated 2027 earnings, respectively. The S&P 500 trades for closer to 19 times.
Limestone serves some of the same end markets as aggregates. Martin Marietta's CEO, Ward Nye, pointed out in its statement that the business has "aggregate-like characteristics."
"This transaction represents another transformational milestone for Martin Marietta and directly advances our [long-term] objective to expand our complementary, upstream Specialties segment in lime and other industrial minerals," said Nye in a statement.
"It builds on our core quarrying competency, expands our geographic footprint and immediately establishes Martin Marietta as the leading national producer of lime solutions," he said.
Even if limestone is aggregate-like, it's still a large deal.
Martin Marietta is using $7 billion in cash and $6.5 billion in stock. Share issuance is another reason a stock can trade down on a deal. The acquisition is expected to close in the second half of this year, according to the statement.
Martin Marietta is paying 15 times adjusted earnings before interest, taxes, depreciation, and amortization, or Ebitda. Martin trades for about 17 times estimated 2026 Ebitda.
Debt to Ebitda will tick up to 3.7 times at closing, according to the company. Martin plans to be back to 2.5 times in 24 months. Higher debt can also give investors pause.
Lhoist North America is part of the Belgian industrial company Lhoist Group. It's the largest in the history of Martin Marietta. It's a bold move, and investors are waiting to see how it turns out.
Write to Al Root at allen.root@dowjones.com and Kit Norton at kit.norton@barrons.com
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(END) Dow Jones Newswires
June 29, 2026 10:36 ET (14:36 GMT)
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