Lhoist North America, a subsidiary of Lhoist Group, is a producer of hi-calcium lime, dolomitic lime and industrial mineral products, operating 20 quarries and production facilities and 45 distribution terminals.
The deal values LNA at an enterprise value of $13.5bn, around 15 times the company's adjusted EBITDA for 2025, including run-rate synergies, the companies said.
The consideration consists of $7.0bn in cash and $6.5bn in MMM common stock.
MMM said the deal would create a leading lime and limestone franchise with broad exposure to critical infrastructure and industrial end markets.
"This transaction represents another transformational milestone for Martin Marietta and directly advances our SOAR 2030 objective to expand our complementary, upstream Specialties segment in lime and other industrial minerals," said MMM's president and chief executive Ward Nye.
"It builds on our core quarrying competency, expands our geographic footprint and immediately establishes Martin Marietta as the leading national producer of lime solutions."