---
schema_version: "secwatch.filing_event.v1"
accession: "0000950157-26-000758"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2026-06-29T11:43:18+00:00"
generated_at: "2026-06-29T11:45:24.144895+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Martin Marietta to acquire Lhoist North America for $13.5B in cash and stock

## Summary
- Enterprise value $13.5B: $7B cash + $6.5B stock; expected close H2 2026 subject to regulatory approvals.
- LNA 2025A gross sales $1.8B, Adj. EBITDA $786M (45% margin), 94% free cash flow conversion.
- Expected ~$85M annual run-rate cost synergies within 2 years; deal accretive to earnings and margins in first year.
- LNA controls >2B tons limestone reserves (200+ years useful life), #1 U.S. lime producer.
- Berghmans family to own ~15% of MLM post-deal and appoint one director and one observer.

## SEC filing metadata
- accession: 0000950157-26-000758
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2026-06-29T11:43:18+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000095015726000758/0000950157-26-000758-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000095015726000758/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950157-26-000758
- JSON: https://secwatch.observer/filing/0000950157-26-000758.json
- Plain text: https://secwatch.observer/filing/0000950157-26-000758.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.