Vulcan Materials Reports MSHA Imminent Danger Order at California Quarry

Executive Summary

On October 30, 2026, Vulcan Materials Company (NYSE: VMC) filed a Form 8-K with the U.S. Securities and Exchange Commission pursuant to Item 1.04 (Mine Safety - Reporting of Shutdowns and Patterns of Violations).

Key Event Details

• Facility: Lexington Quarry located in Los Gatos, California.
• Operating Subsidiary: Calmat Co.
• Date of Event: October 27, 2026.
• Regulatory Action: Receipt of an imminent danger order issued by the Mine Safety and Health Administration (MSHA) under Section 107(a) of the Federal Mine Safety and Health Act of 1977.
• Cause: The order was issued to remove personnel exposed to fall hazards during maintenance activities.
• Impact & Remediation: No injuries occurred as a result of the condition. Vulcan Materials reported taking prompt corrective action to address the hazard and terminate the MSHA order.

Market and Trading Assessment

• Significance: Low.
• Materiality: Section 1503 of the Dodd-Frank Act mandates Form 8-K disclosures upon the receipt of certain MSHA orders, including Section 107(a) imminent danger orders. Because this incident was localized, resulted in no injuries, was resolved immediately, and carries no material operational disruption or financial impact, it is not expected to affect VMC share performance.