MasTec announces 401(k) plan blackout period from Sept 22 to Oct 19, 2025, due to recordkeeper switch to Schwab

MASTEC INC

Blackout period expected to begin at 4:00 pm ET on Sept 22, 2025 and end during week of Oct 19, 2025.
Plan participants will be unable to change investments, contributions, loans, or distributions during the blackout.
Directors and Section 16 officers are prohibited from trading MasTec common stock during the blackout per Sarbanes-Oxley.
Recordkeeper services transitioning from Bank of America/Merrill Lynch to Schwab Retirement Plan Services effective Oct 1, 2025.
Blackout notice sent to directors and executive officers on August 26, 2025, via Exhibit 99.1.

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