Martin Marietta agrees to buy Lhoist North America in a transaction valued at $13.5 billion, according to multiple reports. The deal is described as a cash-and-stock arrangement, bringing Martin Marietta’s building-materials footprint in lime and related products. Quartz reports that the acquisition would make the Raleigh, North Carolina–based company the leading lime producer in the United States. Other outlets similarly describe the transaction size and the target company as Lhoist North America, without highlighting material differences in structure or valuation. Across sources, there is no consistent additional detail provided here on timing, regulatory approvals, or specific financing terms beyond the cash-and-stock characterization. The reports present the agreement as a major consolidation move in North American lime production, positioning Martin Marietta to expand capacity and market presence through the acquisition of Lhoist North America.