---
schema_version: "secwatch.filing_event.v1"
accession: "0000950157-25-000609"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2025-08-04T23:59:59+00:00"
generated_at: "2026-05-17T21:42:39.038641+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Martin Marietta swaps cement for Quikrete aggregates plus $450M; raises 2025 EBITDA guidance

## Summary
- Agreed to exchange Midlothian cement plant and N. Texas ready-mix assets for Quikrete aggregates (~20M tons/yr) and $450M cash; close expected Q1 2026.
- Completed acquisition of Premier Magnesia, LLC, a magnesia-based products producer with operations in NV, NC, IN, PA.
- Preliminary Q2 2025 revenue $1.81B, net earnings $328M, Adjusted EBITDA $630M.
- Raising full-year 2025 Adjusted EBITDA guidance to $2.30B midpoint, driven by strong H1 and Premier contribution.

## SEC filing metadata
- accession: 0000950157-25-000609
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2025-08-04T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000095015725000609/0000950157-25-000609-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000095015725000609/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950157-25-000609
- JSON: https://secwatch.observer/filing/0000950157-25-000609.json
- Plain text: https://secwatch.observer/filing/0000950157-25-000609.txt

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