Raleigh’s homegrown building-materials heavyweight, Martin Marietta Materials, is lining up a deal to combine with Lhoist North America in a transaction pegged at about $13.5 billion. The planned mashup would knit together Martin Marietta’s U.S. aggregates and specialty-chemicals operations with Lhoist’s lime and dolime business, stretching the combined footprint across construction, steel and environmental markets. So far, neither company has issued a full public statement on the reports.
The first word of the deal surfaced in a Wall Street Journal report, with market write-ups saying the package would be financed with roughly $7 billion in cash and about $6.5 billion in stock. The Berghmans family, which controls Lhoist Group, is expected to end up with around 15% of the combined company once the transaction closes, according to a summary captured by StreetInsider.
Deal details
Once the Journal story hit market feeds, investors did not wait around. Martin Marietta shares slipped about 1.5% in premarket trading, and, as Reuters noted, neither company was immediately reachable for comment. Reported terms center on a mix of cash and stock consideration that would bulk up Martin Marietta’s presence in specialty minerals and chemicals.
Why it matters in Raleigh
Martin Marietta is headquartered in Raleigh, and its Specialties division already turns out magnesia and other chemical-grade mineral products for steel, water-treatment and environmental customers. According to Martin Marietta, those businesses are a key plank of its portfolio, which means the Triangle could feel some aftershocks if the two companies start knitting operations together or redirecting capital spending.
Industry and regulatory questions
If completed, the deal would further concentrate North American supply of lime and specialty minerals, a trend that often draws close attention from customers and regulators. Lhoist has already been in expansion mode in the United States, including new capacity in Texas highlighted in a company announcement carried by PR Newswire. At the same time, local reporting has flagged air-quality concerns near some lime plants, such as coverage from WVTF about elevated sulfur dioxide levels near a facility, developments that analysts say could shape how a combined company is scrutinized.
What is next
There are still no public filings that spell out a timetable, regulatory roadmap or integration plan for the transaction, so for now the deal is living mostly in the world of market reports and unanswered phone calls. Observers will be watching for formal announcements, antitrust reviews and fresh commentary from executives as the story moves along. Reuters carried the initial report on June 29, 2026.
