---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-346914"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2026-08-12T20:19:50+00:00"
generated_at: "2026-08-12T20:21:27.647563+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Martin Marietta prices $5.5B multi-tranche senior notes to fund Lhoist acquisition

## Summary
- $5.5B aggregate principal across five tranches: $750M 4.850% 2029, $1.25B 5.200% 2032, $1.0B 5.400% 2034, $1.5B 5.625% 2036, $1.0B 6.375% 2056.
- Net proceeds, plus $1.5B term loan, to pay cash consideration for Lhoist North America acquisition.
- Priced Aug 11, 2026; expected closing Q3 2026 with customary conditions.
- Underwriters: Goldman Sachs, J.P. Morgan, Deutsche Bank, Truist Securities.
- Notes issued at 99.936% to 99.660% of par; semiannual interest payments.

## SEC filing metadata
- accession: 0001193125-26-346914
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2026-08-12T20:19:50+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000119312526346914/0001193125-26-346914-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000119312526346914/d149482d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-346914
- JSON: https://secwatch.observer/filing/0001193125-26-346914.json
- Plain text: https://secwatch.observer/filing/0001193125-26-346914.txt

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