MTZ

SEC source: 0000015615-25-000148 · wk-form4_1763502187.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,658

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000148 · wk-form4_1763502187.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,706

SEC source: 0000015615-25-000146 · wk-form4_1763502147.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,086

SEC source: 0000015615-25-000145 · wk-form4_1763502101.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,422

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000145 · wk-form4_1763502101.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,470

SEC source: 0000015615-25-000143 · wk-form4_1763502060.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,492

SEC source: 0000015615-25-000140 · wk-form4_1763501992.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,604

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000140 · wk-form4_1763501992.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,656

SEC source: 0000015615-25-000142 · wk-form4_1763502036.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,112

F2 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000142 · wk-form4_1763502036.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,143

F1 · shares: 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.

SEC source: 0000015615-25-000133 · wk-form4_1762378639.xml · nonDerivative · entry 1

Love Timothy Michael · CIK 0001345434 · CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,757

F1 · price: 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.

SEC source: 0000015615-25-000119 · wk-form4_1760560806.xml · nonDerivative · entry 1

Love Timothy Michael · CIK 0001345434 · CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,686

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000118 · wk-form4_1760560772.xml · nonDerivative · entry 1

DiMarco Paul · CIK 0001965258 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,553

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000112 · wk-form4_1759350786.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,277

F1 · shares: 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.

SEC source: 0000015615-25-000110 · wk-form4_1758573111.xml · nonDerivative · entry 2

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 184,249

F1 · shares: 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.

F3 · balance_after: 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.

SEC source: 0000015615-25-000110 · wk-form4_1758573111.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 184,349

F1 · shares: 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.

F2 · price: 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.

SEC source: 0000015615-25-000108 · wk-form4_1758056133.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,277

F1 · shares: These shares were sold in 47 separate transactions, each with a price of $190.39. 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.

SEC source: 0000950170-25-110967 · ownership.xml · derivative · entry 2

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,099,335

Underlying: Common Stock · 1,099,335 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,176,933 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 18, 2025, JM Holdings I and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 1,099,335 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · derivative.exercise_price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · kind: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,176,933 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · kind: On August 18, 2025, JM Holdings I and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 1,099,335 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · kind: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,176,933 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · price: On August 18, 2025, JM Holdings I and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 1,099,335 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

F7 · ownership.nature: Shares owned of record by JM Holdings I.

SEC source: 0000950170-25-110967 · ownership.xml · derivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 1,176,933 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,176,933 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 18, 2025, JM Holdings I and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 1,099,335 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · derivative.exercise_price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · kind: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,176,933 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · kind: On August 18, 2025, JM Holdings I and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 1,099,335 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · kind: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,176,933 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · price: On August 18, 2025, JM Holdings I and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 1,099,335 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

F7 · ownership.nature: Shares owned of record by JM Holdings I.

SEC source: 0000950170-25-110961 · ownership.xml · derivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 340,794

Underlying: Common Stock · 340,794 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 364,850 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 18, 2025, the reporting person and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 340,794 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · derivative.exercise_price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · kind: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 364,850 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · kind: On August 18, 2025, the reporting person and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 340,794 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · kind: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 364,850 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · price: On August 18, 2025, the reporting person and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 340,794 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

SEC source: 0000950170-25-110961 · ownership.xml · derivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 364,850 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 364,850 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 18, 2025, the reporting person and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 340,794 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · derivative.exercise_price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · kind: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 364,850 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · kind: On August 18, 2025, the reporting person and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 340,794 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · kind: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F1 · price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 364,850 shares (the "2024 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2024 Pledged Shares during the term of the pledge.

F2 · price: On August 18, 2025, the reporting person and the buyer entered into a third amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 21, 2025, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 2 Component, with such adjustment resulting in a reduction in the number of 2024 Pledged Shares to 340,794 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

F5 · price: (Continued from Footnote 4) (c) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component exceeds the Tranche 1 Cap Price or Tranche 2 Cap Price, respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable component multiplied by the quotient of (x) the applicable Floor Price plus such excess divided by (y) such Valuation Price.

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 3, 2027.

SEC source: 0000015615-25-000103 · wk-form4_1755636423.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,869

F2 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000103 · wk-form4_1755636423.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,902

F1 · shares: 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 August 14, 2025. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 147 of such shares to a future date in accordance with the terms of such plan.

SEC source: 0000015615-25-000102 · wk-form4_1755636325.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,277

SEC source: 0000015615-25-000100 · wk-form4_1755636198.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,871

SEC source: 0000015615-25-000101 · wk-form4_1755636262.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,255

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000101 · wk-form4_1755636262.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,307

SEC source: 0000015615-25-000099 · wk-form4_1755636136.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,491

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000099 · wk-form4_1755636136.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,543

SEC source: 0000015615-25-000098 · wk-form4_1755636064.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,421

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000098 · wk-form4_1755636064.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,477

SEC source: 0000015615-25-000083 · wk-form4_1754600828.xml · nonDerivative · entry 2

de Cardenas Alberto · CIK 0001250037 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,349

SEC source: 0000015615-25-000083 · wk-form4_1754600828.xml · nonDerivative · entry 1

de Cardenas Alberto · CIK 0001250037 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,249

SEC source: 0000015615-25-000068 · wk-form4_1752870727.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 194,249

F1 · shares: 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 4.9% of the shares directly owned by Mr. Apple.

F2 · balance_after: Includes 95,750 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.

SEC source: 0001628280-25-026608 · wk-form4_1747689587.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,223

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0001628280-25-026608 · wk-form4_1747689587.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,287

SEC source: 0001628280-25-026607 · wk-form4_1747689562.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,311

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0001628280-25-026607 · wk-form4_1747689562.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,369

SEC source: 0001628280-25-026605 · wk-form4_1747689532.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,639

SEC source: 0001628280-25-026604 · wk-form4_1747689497.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,075

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0001628280-25-026604 · wk-form4_1747689497.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,133

SEC source: 0001628280-25-026603 · wk-form4_1747689464.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,045

SEC source: 0001628280-25-026602 · wk-form4_1747689431.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,607

F2 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0001628280-25-026602 · wk-form4_1747689431.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,644

F1 · shares: 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, 2025. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 167 of such shares to a future date in accordance with the terms of such plan.

SEC source: 0001628280-25-025572 · wk-form4_1747257230.xml · nonDerivative · entry 2

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,782

F2 · shares: These shares were sold in two separate transactions, each with a price of $155.00. 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.

SEC source: 0001628280-25-025572 · wk-form4_1747257230.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,782

F1 · shares: These shares were sold in 24 separate transactions, each with a price of $153.89. 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.

SEC source: 0000015615-25-000042 · wk-form4_1743021603.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 204,249

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

F2 · balance_after: Includes 87,095 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.

SEC source: 0000015615-25-000041 · wk-form4_1743021554.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,256,248

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000040 · wk-form4_1743021430.xml · nonDerivative · entry 1

de Cardenas Alberto · CIK 0001250037 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,349

F1 · shares: Shares disposed of represent shares withheld by the Issuer to pay taxes due upon vesting of restricted stock.

SEC source: 0000015615-25-000039 · wk-form4_1743021376.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,000