---
schema_version: "secwatch.filing_event.v1"
accession: "0000950157-25-001013"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2025-12-19T23:59:59+00:00"
generated_at: "2026-05-16T12:41:18.160323+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Martin Marietta extends $800M revolver maturity to Dec 21, 2030

## Summary
- Extended $800M unsecured revolver maturity from Dec 2029 to Dec 2030 via Loan Modification No. 4.
- Consent fee of 0.02% of commitment paid to extending lenders; facility size unchanged.
- Amendment effective Dec 19, 2025; all existing lenders extended their commitments.
- No changes to financial covenants, interest rate margins, or facility terms beyond maturity.

## SEC filing metadata
- accession: 0000950157-25-001013
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2025-12-19T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.25
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000095015725001013/0000950157-25-001013-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000095015725001013/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950157-25-001013
- JSON: https://secwatch.observer/filing/0000950157-25-001013.json
- Plain text: https://secwatch.observer/filing/0000950157-25-001013.txt

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