SCHEDULE 13D/A

MASTEC INC COM

Common Stock, Par Value $.10 Per Share · CUSIP: 576323109

Event date: 2025-08-21

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Jose Ramon MasReported CIK 0001079760

  Shares: 6,186,877 · Class: 7.8%

• Jose Ramon Mas Holdings I, LLC

  Shares: 1,280,688 · Class: 1.6%

• Jose Ramon Mas Holdings, LLC

  Shares: 1,280,688 · Class: 1.6%

• Jorge Mas Irrevocable Family Trust

  Shares: 848,941 · Class: 1.1%

• Jose Ramon Mas Irrevocable Family Trust

  Shares: 425,000 · Class: 0.5%

• Mas Equity Partners III, LLC

  Shares: 276,000 · Class: 0.3%

• Mas Family Foundation Inc.

  Shares: 100,000 · Class: 0.1%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.