U.S.-based construction materials company Martin Marietta Materials has announced a $13.5 billion cash-and-stock merger with Lhoist North America, marking the largest acquisition in the company’s history. The transaction was announced on June 29, 2026, and is expected to close in the second half of 2026, subject to regulatory approvals and customary closing conditions.
Once completed, the deal will establish Martin Marietta as North America’s leading producer of lime and limestone products, significantly strengthening its position in industrial materials and infrastructure markets.
Key Highlights of Merger
| Deal Details | Information |
| Acquirer | Martin Marietta Materials |
| Target | Lhoist North America |
| Deal Value | US$13.5 Billion |
| Deal Type | Cash + Stock Combination |
| Cash Consideration | US$7 Billion |
| Stock Consideration | US$6.5 Billion (Martin Marietta Shares) |
| Acquirer Country | United States |
| Target Country | United States (Lhoist North America, part of Belgium-based Lhoist Group) |
| Industry | Construction Materials, Lime & Industrial Minerals |
| Acquirer Exchange | New York Stock Exchange (NYSE) |
| Ticker Symbol | MLM |
| Expected Closing | Second Half of 2026 (Subject to Regulatory Approval) |
Company Overview
Martin Marietta Materials
Martin Marietta Materials is one of the leading U.S. producers of construction materials. Headquartered in Raleigh, North Carolina, the company was founded in 1993 and supplies essential materials used in large-scale infrastructure and commercial projects.
Its primary products include:
- Crushed Stone
- Sand
- Gravel
- Cement
- Asphalt
- Industrial Minerals
These materials are widely used in:
- Highways and Roads
- Bridges
- Airports
- Data Centers
- Manufacturing Facilities
- Energy Projects
- Residential and Commercial Construction
Lhoist North America
Lhoist North America is the North American division of Lhoist Group, a Belgium-based global leader in lime and industrial minerals.
The company manufactures:
- High-Calcium Lime
- Dolomitic Lime
- Limestone Products
- Industrial Minerals
Its products serve a wide range of industries, including:
- Steel Manufacturing
- Water Treatment
- Agriculture
- Mining
- Infrastructure
- Environmental Solutions
Lhoist has built a strong presence across North America with strategically located production facilities and distribution terminals.
Why Is Martin Marietta Acquiring Lhoist North America?
This acquisition is more than just an expansion of Martin Marietta’s business. It represents a long-term strategy to diversify beyond traditional construction aggregates and strengthen its presence in higher-value industrial materials.
The company expects increasing demand from industries such as:
- Artificial Intelligence Data Centers
- Semiconductor Manufacturing
- Steel Production
- Infrastructure Development
- Energy Projects
- Environmental Applications
By expanding into the lime business, Martin Marietta aims to position itself for long-term industrial growth across North America.
What Does Martin Marietta Gain?
1. Leadership in the Lime Industry
Following the merger, Martin Marietta will become North America’s largest lime producer, significantly expanding its industrial materials portfolio and strengthening its Specialties business.
2. Expanded Production Network
Lhoist North America brings:
- Approximately 20 Production Facilities and Quarries
- Around 45 Distribution Terminals
This expanded network will improve Martin Marietta’s manufacturing capacity, logistics, and customer reach across the continent.
3. Over 2 Billion Tons of Limestone Reserves
One of the biggest advantages of the acquisition is access to approximately 2 billion tons of high-quality limestone reserves.
According to the company, these reserves have an estimated life of more than 200 years, providing a stable long-term supply of raw materials.
4. Strong Presence in High-Growth Regions
Many of Lhoist’s operations are located in rapidly growing U.S. regions where demand continues to rise due to:
- AI Data Centers
- Advanced Manufacturing Facilities
- Logistics Hubs
- Residential and Commercial Construction
These markets are expected to support long-term growth in demand for construction and industrial materials.
Benefits for Lhoist Group
The transaction is not solely a cash exit for Lhoist.
In addition to receiving cash, the company will receive Martin Marietta shares. After the merger closes, the Berghmans family, the owners of Lhoist Group, will hold approximately 15% ownership in Martin Marietta and will gain representation on the company’s Board of Directors.
This allows Lhoist to remain invested in the future growth of the combined business.
Expected Cost Synergies
Martin Marietta expects to generate approximately $85 million in annual cost synergies after integrating the two businesses.
These savings are expected to come from:
- Supply Chain Optimization
- Procurement Efficiencies
- Logistics Improvements
- Operational Integration
- Lower Administrative Costs
Industries That Could Benefit
The merger is expected to have a positive impact across several key industries.
Steel Industry
Lime is an essential material used in steel manufacturing, making this sector one of the biggest beneficiaries.
Infrastructure
Roads, bridges, tunnels, airports, and public infrastructure projects require large quantities of limestone and aggregates, supporting long-term demand.
Energy Sector
Lime products are also used in renewable energy projects, natural gas facilities, and nuclear power plants.
AI Data Centers
As investment in artificial intelligence and cloud computing accelerates, construction of new data centers is expected to increase demand for cement, aggregates, and lime products.
Market Reaction
Following the announcement, Martin Marietta’s shares experienced some initial pressure as investors assessed the size of the acquisition and its financing requirements.
However, many analysts believe the transaction could strengthen the company’s long-term earnings potential by expanding its exposure to high-growth industrial and infrastructure markets while reducing reliance on traditional aggregates.
What Happens Next?
Before the transaction can be completed, both companies must obtain:
- Regulatory Approvals
- Required Closing Conditions
- Integration Planning and Operational Preparation
If all approvals are received as expected, the merger is anticipated to close during the second half of 2026.
Outcome
The $13.5 billion combination of Martin Marietta and Lhoist North America is one of the most significant transactions in the North American construction materials industry in recent years. Beyond increasing scale, the merger positions Martin Marietta as the continent’s leading producer of lime while expanding its exposure to fast-growing sectors such as AI data centers, semiconductor manufacturing, steel production, and infrastructure development.
With access to extensive limestone reserves, an expanded production footprint, and expected operational synergies, the combined company is well positioned for long-term growth. Meanwhile, Lhoist Group will continue to participate in that growth through its significant ownership stake in Martin Marietta, making the deal strategically beneficial for both companies.
Source: Martin Marietta News
