MTZ

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

These shares of Common Stock represent the portion of the reporting person's quarterly compensation that the reporting person was required to or elected to receive in the form of shares of Common Stock. The number of shares was calculated based on the closing price of a share of Common Stock on May 14, 2026. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 60 of such shares to a future date in accordance with the terms of such plan.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

These shares were sold in 14 separate transactions, each with a price of $417.00. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

Includes 85,750 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries.

Includes 4,575 shares of MasTec common stock contributed by the reporting person to the Paul DiMarco Revocable Trust of which the reporting person is the sole trustee and sole beneficiary.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Includes 85,750 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

These shares of Common Stock represent the portion of the reporting person's quarterly compensation that the reporting person was required to or elected to receive in the form of shares of Common Stock. The number of shares was calculated based on the closing price of a share of Common Stock on February 13, 2026. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 97 of such shares to a future date in accordance with the terms of such plan

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

These shares of Common Stock represent the portion of the reporting person's quarterly compensation that the reporting person was required to or elected to receive in the form of shares of Common Stock. The number of shares was calculated based on the closing price of a share of Common Stock on November 14, 2025. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 137 of such shares to a future date in accordance with the terms of such plan.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

The price reported in Column 4 is a weighted average price. These shares were sold in eight separate transactions, with prices ranging from $206.09 to $206.32 for an average weighted sales price of $206.15. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

These shares were sold in eight separate transactions, each with a price of $210.39. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

Mr. Apple, 75 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 10,000 shares sold under the plan represent 5.15% of the shares directly owned by Mr. Apple.

The price reported in Column 4 is a weighted average price. These shares were sold in 47 separate transactions, with prices ranging from $200.03 to $201.00 for an average weighted sales price of $200.43. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.