MTZ

SEC source: 0000015615-26-000116 · wk-form4_1787087641.xml · nonDerivative · entry 1

Miranda Manuel Benito · CIK 0002065237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152

SEC source: 0000015615-26-000113 · wk-form4_1787085798.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,774

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

SEC source: 0000015615-26-000113 · wk-form4_1787085798.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,805

SEC source: 0000015615-26-000111 · wk-form4_1787085664.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,934

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

SEC source: 0000015615-26-000111 · wk-form4_1787085664.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,968

SEC source: 0000015615-26-000110 · wk-form4_1787085641.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,880

SEC source: 0000015615-26-000109 · wk-form4_1787085623.xml · nonDerivative · entry 1

Spiro Alex · CIK 0001652478 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139

SEC source: 0000015615-26-000108 · wk-form4_1787085598.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,960

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

SEC source: 0000015615-26-000108 · wk-form4_1787085598.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,991

SEC source: 0000015615-26-000107 · wk-form4_1787085568.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,474

SEC source: 0000015615-26-000106 · wk-form4_1787085512.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,549

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

SEC source: 0000015615-26-000106 · wk-form4_1787085512.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,569

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, 2026. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 88 of such shares to a future date in accordance with the terms of such plan.

SEC source: 0001193125-26-349225 · 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 340,794 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 10, 2026, the reporting person and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 340,794 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · kind: On August 10, 2026, the reporting person and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 340,794 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · price: On August 10, 2026, the reporting person and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 16, 2027 and September 1, 2028.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 16, 2027 and September 1, 2028.

SEC source: 0001193125-26-349225 · 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 · 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 340,794 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 10, 2026, the reporting person and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 340,794 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · kind: On August 10, 2026, the reporting person and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 340,794 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · price: On August 10, 2026, the reporting person and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 16, 2027 and September 1, 2028.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 16, 2027 and September 1, 2028.

SEC source: 0001193125-26-349223 · 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 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · kind: On August 10, 2026, JM Holdings I and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 16, 2027 and September 1, 2028.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 16, 2027 and September 1, 2028.

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

SEC source: 0001193125-26-349223 · 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 · 1,099,335 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 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · kind: On August 10, 2026, JM Holdings I and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth 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 1 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 11, 2026. 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 $246.5096 (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 $350.5914 (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 16, 2027 and September 1, 2028.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 16, 2027 and September 1, 2028.

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

SEC source: 0000015615-26-000067 · wk-form4_1780691718.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,816

SEC source: 0000015615-26-000065 · wk-form4_1779223916.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,316

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

SEC source: 0000015615-26-000065 · wk-form4_1779223916.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,339

SEC source: 0000015615-26-000064 · wk-form4_1779223885.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,852

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

SEC source: 0000015615-26-000064 · wk-form4_1779223885.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,873

SEC source: 0000015615-26-000063 · wk-form4_1779223853.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,392

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

SEC source: 0000015615-26-000063 · wk-form4_1779223853.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,406

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, 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.

SEC source: 0000015615-26-000062 · wk-form4_1779223804.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,741

SEC source: 0000015615-26-000061 · wk-form4_1779223729.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,666

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

SEC source: 0000015615-26-000061 · wk-form4_1779223729.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,687

SEC source: 0000015615-26-000060 · wk-form4_1779223675.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,335

SEC source: 0000015615-26-000055 · wk-form4_1778100075.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,646

F1 · shares: 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.

SEC source: 0000015615-26-000040 · wk-form4_1774643273.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,592

SEC source: 0000015615-26-000038 · wk-form4_1774040458.xml · nonDerivative · entry 1

DiMarco Paul · CIK 0001965258 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,627

F1 · balance_after: 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.

SEC source: 0000015615-26-000037 · wk-form4_1774040395.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 183,591

F1 · 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: 0000015615-26-000036 · wk-form4_1774040367.xml · nonDerivative · entry 1

de Cardenas Alberto · CIK 0001250037 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,780

SEC source: 0000015615-26-000035 · wk-form4_1774040344.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,556,686

SEC source: 0000015615-26-000034 · wk-form4_1774040317.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,254,461

SEC source: 0000015615-26-000042 · wk-form4_1776457163.xml · nonDerivative · entry 1

Love Timothy Michael · CIK 0001345434 · CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,292

SEC source: 0000015615-26-000029 · wk-form4_1773347443.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,540,848

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

SEC source: 0000015615-26-000028 · wk-form4_1773347417.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,228,064

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

SEC source: 0000015615-26-000027 · wk-form4_1773347369.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 172,043

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

F2 · 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: 0000015615-26-000026 · wk-form4_1773347332.xml · nonDerivative · entry 1

de Cardenas Alberto · CIK 0001250037 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,511

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

SEC source: 0000015615-26-000022 · wk-form4_1772746209.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,235

SEC source: 0000015615-26-000011 · wk-form4_1771450869.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,542

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

SEC source: 0000015615-26-000011 · wk-form4_1771450869.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,576

SEC source: 0000015615-26-000010 · wk-form4_1771450838.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,240

SEC source: 0000015615-26-000008 · wk-form4_1771450765.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,735

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

SEC source: 0000015615-26-000008 · wk-form4_1771450765.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,772

SEC source: 0000015615-26-000009 · wk-form4_1771450798.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,778

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

SEC source: 0000015615-26-000009 · wk-form4_1771450798.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,812

SEC source: 0000015615-26-000007 · wk-form4_1771450736.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,646

SEC source: 0000015615-26-000006 · wk-form4_1771450668.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,285

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

SEC source: 0000015615-26-000006 · wk-form4_1771450668.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,307

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 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