---
schema_version: "secwatch.filing_event.v1"
accession: "0000950157-26-000549"
form_type: "8-K"
ticker: "MLM"
cik: "0000916076"
company_name: "MARTIN MARIETTA MATERIALS INC"
filed_at: "2026-04-27T23:59:59+00:00"
generated_at: "2026-05-15T04:09:04.382337+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Martin Marietta appoints Christopher Samborski as EVP & COO effective May 1, 2026

## Summary
- Samborski previously President of West & Specialties; Kirk Light assumes those divisions.
- Base salary $775,000; target annual incentive 100% of base; LTIP target 260% of base.
- One-time RSU grant of $5M, vesting ratably on 6th, 7th, and 8th anniversaries.
- Severance: 3x base salary plus target bonus on termination without cause or good reason.
- Employment agreement includes 3-year post-termination non-compete and non-solicitation.

## SEC filing metadata
- accession: 0000950157-26-000549
- form_type: 8-K
- ticker: MLM
- cik: 0000916076
- company_name: MARTIN MARIETTA MATERIALS INC
- filed_at: 2026-04-27T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/916076/000095015726000549/0000950157-26-000549-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/916076/000095015726000549/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950157-26-000549
- JSON: https://secwatch.observer/filing/0000950157-26-000549.json
- Plain text: https://secwatch.observer/filing/0000950157-26-000549.txt

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