---
schema_version: "secwatch.filing_event.v1"
accession: "0000950157-26-000770"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2026-06-29T21:27:36+00:00"
generated_at: "2026-06-29T21:28:34.812568+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 1.0
calibrated_materiality_score: 1.0
confidence: "high"
source: SEC EDGAR
---

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

## Summary
- Total consideration $13.5B: $7B cash + $6.5B in new MLM shares (10,953,543 shares at 15-day VWAP).
- LNA Holding to receive 10,953,543 newly issued MLM shares and $7B cash.
- Transaction closing expected by Oct 31, 2026, extendable to June 15, 2027; subject to HSR and regulatory approvals.
- Termination fee of $350M payable by MLM if regulatory clearances not obtained by extended long-stop date.
- LNA Holding will hold ~15% of MLM post-close, get board seat and observer rights, shares locked up 12-24 months.

## SEC filing metadata
- accession: 0000950157-26-000770
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2026-06-29T21:27:36+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 1.0
- calibrated_materiality_score: 1.0
- confidence: high
- sec_items: 1.01, 3.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000095015726000770/0000950157-26-000770-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000095015726000770/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950157-26-000770
- JSON: https://secwatch.observer/filing/0000950157-26-000770.json
- Plain text: https://secwatch.observer/filing/0000950157-26-000770.txt

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