---
schema_version: "secwatch.filing_event.v1"
accession: "0000950157-26-000946"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2026-08-24T11:33:53+00:00"
generated_at: "2026-08-24T11:35:06.478458+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 closes $13.5B Lhoist North America acquisition; adds director

## Summary
- Completed LNA acquisition Aug 21, 2026 for ~$7B cash plus 10,953,543 shares valued at $6.5B (total ~$13.5B).
- Board expanded to 11; Philipp Niemann, CEO of Lhoist S.A., appointed director effective Aug 21, 2026.
- LNA Holding lock-up: 50% of shares released at 12 months, 50% at 24 months; standstill caps ownership at 18%.
- LNA adds >2 billion tons of high-quality limestone reserves; Martin Marietta now leading U.S. limestone producer.
- Company to provide updated FY2026 revenue and Adjusted EBITDA guidance with Q3 results.

## SEC filing metadata
- accession: 0000950157-26-000946
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2026-08-24T11:33:53+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 2.01, 3.02, 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000095015726000946/0000950157-26-000946-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000095015726000946/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950157-26-000946
- JSON: https://secwatch.observer/filing/0000950157-26-000946.json
- Plain text: https://secwatch.observer/filing/0000950157-26-000946.txt

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