Martin Marietta Materials (MLM) agreed to combine with limestone supplier Lhoist North America in a $13.5 billion deal as the American building materials supplier aims to expand its lime portfolio amid resilient demand.
The transaction's consideration comprises $7 billion in cash and $6.5 billion worth of Martin Marietta's shares, the company said Monday. Lhoist North America is owned by Belgian industrial company Lhoist Group.
Martin Marietta's shares fell 6.4% in Monday trade, taking its year-to-date loss to 7.3%.
The acquisition establishes Martin Marietta as the leading national producer of lime solutions, with demand for lime products expected to "remain resilient for decades to come," Chief Executive Ward Nye said.
The deal is expected to strengthen Martin Marietta's presence in Texas and the Southeast.
Lhoist North America, which produces hi-calcium lime, dolomitic lime and industrial mineral products, operates a network of 20 quarries and production facilities, as well as 45 distribution terminals. It generated $1.8 billion in gross sales for 2025, Martin Marietta said.
Lhoist North America has more than 2 billion tons of limestone reserves in the Sun Belt metropolitan corridors.
Martin Marietta estimates the transaction to be accretive to earnings and margins in the first full year after completion. The deal is expected to generate about $85 million in annual run-rate cost synergies, with further commercial and operational opportunities.
Following completion, the Berghmans family, which founded Lhoist Group, is expected to own a 15% stake in Martin Marietta, with the right to appoint one director and one observer to the company's board.
The deal, which requires approval from regulators, is expected to complete in the second half.
In April, Martin Marietta agreed to acquire aggregates supplier New Frontier Materials.
Price: $577.10, Change: $-38.96, Percent Change: -6.32%



