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Martin Marietta (MLM) is lower after agreeing to combine with Lhoist North America in a cash-and-stock transaction valued at approximately $13.5 bln. The deal would make MLM the leading U.S. producer of lime and limestone while materially expanding its higher-margin Specialties business. However, shares appear pressured by the purchase price, added leverage, and meaningful stock issuance, as the transaction values LNA at roughly 15x adjusted EBITDA including expected synergies and would increase combined net leverage to approximately 3.7x at closing.

• Strategic fit: Lhoist would significantly expand MLM's Specialties platform with lime and industrial-mineral assets that share many attractive characteristics with aggregates, including reserve scarcity, capital and permitting requirements, limited substitutes, and transportation advantages.
• Asset quality: LNA brings 20 quarries and processing sites, 45 distribution terminals, more than 2 bln tons of high-quality limestone reserves, and an estimated reserve life exceeding 200 years. Its Sun Belt footprint also complements MLM's presence in Texas and the Southeast.
• Financial profile: LNA generated $1.8 bln in gross revenue and $786 mln in adjusted EBITDA during 2025, representing a 45% margin, while converting 94% of adjusted EBITDA into free cash flow. More than half of its revenue is contracted, providing added visibility. Management expects the transaction to be accretive to earnings and margins in the first full year after closing.
• Growth exposure: The combination would broaden MLM across infrastructure and industrial markets, including highways, data centers, semiconductor facilities, LNG projects, steel, water treatment, environmental applications, and agriculture.
• Valuation and leverage: Consideration consists of $7.0 bln in cash and $6.5 bln in MLM shares. The company expects approximately $85 mln of annual run-rate cost synergies within two years and plans to reduce leverage from approximately 3.7x at closing to below 2.5x within 24 months.

Briefing.com Analyst Insight

MLM is a major supplier of aggregates and other building materials, with much of its business built around owning reserves, operating quarries, and serving local and regional markets. Lhoist fits naturally with that model because lime carries many of the same attractive characteristics as aggregates, including long-lived reserves, substantial capital and permitting requirements, limited substitutes, and favorable transportation economics. The acquisition would significantly expand MLM's higher-margin Specialties business while adding strong cash generation, contracted revenue, and broader exposure to infrastructure and industrial investment. It would also strengthen MLM's platform across Texas and the Southeast, complementing its existing presence in two important growth regions. However, the roughly 15x purchase multiple already includes expected synergies, while leverage is projected to rise to approximately 3.7x at closing. The strategic fit is strong, but the value created will likely depend on MLM preserving Lhoist's margins, capturing the expected efficiencies, and reducing debt on schedule.