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MasTec, Inc. 401(k) Retirement Plan Blackout Period Notice

MasTec, Inc. (MTZ) | August 26, 2025

By Olivia Collins

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MasTec, Inc. is implementing a blackout trading restriction period for its 401(k) Retirement Plan participants and beneficiaries.

The blackout period is in relation to a change in recordkeeping services for the Plan.

During this period, transactions involving MasTec Stock and other investment alternatives will be temporarily suspended.

Reason for Blackout Period

The blackout period is necessary to transfer accounts onto a new recordkeeping platform due to a change in recordkeeping services.

Length of Blackout Period

Expected to begin on September 22, 2025, and end during the week of October 19, 2025, subject to adjustments by the Company.

Restrictions on Directors and Officers

Directors and Section 16 officers are prohibited from transacting MasTec Stock during the blackout period to comply with Sarbanes-Oxley Act regulations.

  • The blackout period aims to ensure a smooth transition of accounts to the new recordkeeping platform without disruptions in Plan transactions.
  • Directors and officers must adhere to trading restrictions to avoid any violations of securities regulations and potential penalties.

Plan participants and beneficiaries are advised to refrain from transactions involving MasTec Stock during the blackout period to comply with regulatory requirements and avoid penalties.