Martin Marietta has agreed to acquire Lhoist North America in a $13.5 billion transaction, according to multiple reports. The deal is described as a combination of cash and stock. The acquisition would expand Martin Marietta’s position in lime and related building-materials markets in the United States. Quartz reports that, after the transaction, Martin Marietta would become the leading U.S. lime producer. Other outlets corroborate the overall deal size and the fact that the transaction involves both cash and shares, though they focus primarily on the headline economics rather than additional operational details. The companies are based in different locations: Lhoist North America is referenced in connection with operations tied to the U.S. market, while Quartz notes Martin Marietta is Raleigh, N.C.-based. The reports do not specify in the provided text the timing for closing, regulatory reviews, or other conditions of the agreement. Overall, the coverage is consistent on the announced purchase price and the structure as a cash-and-stock deal.