MAS JOSE RAMON

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: 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: 0000015615-26-000028 · 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: 0001079760-26-000002 · form4-03062026_090346.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,297

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: 0000015615-25-000041 · 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: 0000015615-25-000031 · wk-form4_1742506983.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,279,939

SEC source: 0001415889-25-007390 · form4-03072025_090312.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,024

SEC source: 0000950170-24-105176 · ownership.xml · derivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 364,850

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 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 16, 2024, the reporting person and the buyer entered into a second 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 September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 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 $78.5147 (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 $136.9646 (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 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · kind: On August 16, 2024, the reporting person and the buyer entered into a second 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 September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 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 $78.5147 (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 $136.9646 (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 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · price: On August 16, 2024, the reporting person and the buyer entered into a second 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 September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 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 $78.5147 (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 $136.9646 (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 4, 2026.

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 4, 2026.

SEC source: 0000950170-24-105176 · 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 · 387,500 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 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 16, 2024, the reporting person and the buyer entered into a second 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 September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 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 $78.5147 (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 $136.9646 (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 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · kind: On August 16, 2024, the reporting person and the buyer entered into a second 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 September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 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 $78.5147 (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 $136.9646 (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 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · price: On August 16, 2024, the reporting person and the buyer entered into a second 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 September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 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 $78.5147 (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 $136.9646 (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 4, 2026.

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 4, 2026.

SEC source: 0000015615-24-000037 · wk-form4_1710967380.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,218,226

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

SEC source: 0000015615-24-000031 · wk-form4_1709848006.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,239,283

SEC source: 0001415889-24-006083 · form4-03012024_090312.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,847

SEC source: 0001209191-23-020296 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,158,246

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

SEC source: 0001209191-23-018506 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,221,458

F1 · balance_after: Reflects transfer of 83,274 shares from the reporting person to Jose Ramon Mas Holdings I, LLC, a Florida limited liability company ("JRM Holdings I").

SEC source: 0001415889-23-004129 · form4-03032023_090337.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,172

SEC source: 0000899243-23-001705 · doc4.xml · derivative · entry 3

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 212,500 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F1 · kind: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F1 · price: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between August 19, 2024 and September 8, 2025.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between August 19, 2024 and September 8, 2025.

F7 · ownership.nature: Shares held by the JR Trust. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purpose of Section 16 or for any other purpose.

SEC source: 0000899243-23-001705 · doc4.xml · derivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 387,500

Underlying: Common Stock · 387,500 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F2 · derivative.exercise_price: On November 28, 2022, (i) the JR Trust and the buyer entered into an agreement to terminate the 2019 Forward Sale Contract to which it was a party with respect to all 212,500 shares covered thereby, with the JR Trust retaining ownership of all such shares, and (ii) the reporting person and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to which the reporting person is a party to reduce the number of shares covered thereby to 387,500 shares (the "Current Pledged Shares") of MasTec, Inc. common stock and to amend the Floor Price (as defined below) and the Cap Price (as defined below), which were determined based on the volume weighted average price of MasTec Inc.'s common stock for a specified period ended on January 10, 2023. 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) Current Pledged Shares are divided into thirty components split into two tranches (each, a "Tranche") of fifteen components each. The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the settlement date of each component in the first ("Tranche 1") or second ("Tranche 2") Tranche, as applicable (or on which to base the amount of cash to be delivered to the buyer on such settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $78.5147 (the "Floor Price"), the reporting person will deliver to the buyer all of the Current Pledged Shares for the applicable component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $124.7512 (the " Tranche 1 Cap Price") in the case of a component in Tranche 1, or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price") in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price; and

F5 · derivative.exercise_price: (Continued from Footnote 4) (c) if such Settlement Price is greater than the Tranche 1 Cap Price in the case of a component in Tranche 1 or greater than the Tranche 2 Cap Price in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the applicable Cap Price, and the denominator of which is such Settlement Price.

F1 · kind: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F2 · kind: On November 28, 2022, (i) the JR Trust and the buyer entered into an agreement to terminate the 2019 Forward Sale Contract to which it was a party with respect to all 212,500 shares covered thereby, with the JR Trust retaining ownership of all such shares, and (ii) the reporting person and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to which the reporting person is a party to reduce the number of shares covered thereby to 387,500 shares (the "Current Pledged Shares") of MasTec, Inc. common stock and to amend the Floor Price (as defined below) and the Cap Price (as defined below), which were determined based on the volume weighted average price of MasTec Inc.'s common stock for a specified period ended on January 10, 2023. 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) Current Pledged Shares are divided into thirty components split into two tranches (each, a "Tranche") of fifteen components each. The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the settlement date of each component in the first ("Tranche 1") or second ("Tranche 2") Tranche, as applicable (or on which to base the amount of cash to be delivered to the buyer on such settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $78.5147 (the "Floor Price"), the reporting person will deliver to the buyer all of the Current Pledged Shares for the applicable component;

F4 · kind: (Continued from Footnote 3) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $124.7512 (the " Tranche 1 Cap Price") in the case of a component in Tranche 1, or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price") in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price; and

F5 · kind: (Continued from Footnote 4) (c) if such Settlement Price is greater than the Tranche 1 Cap Price in the case of a component in Tranche 1 or greater than the Tranche 2 Cap Price in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the applicable Cap Price, and the denominator of which is such Settlement Price.

F1 · price: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F2 · price: On November 28, 2022, (i) the JR Trust and the buyer entered into an agreement to terminate the 2019 Forward Sale Contract to which it was a party with respect to all 212,500 shares covered thereby, with the JR Trust retaining ownership of all such shares, and (ii) the reporting person and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to which the reporting person is a party to reduce the number of shares covered thereby to 387,500 shares (the "Current Pledged Shares") of MasTec, Inc. common stock and to amend the Floor Price (as defined below) and the Cap Price (as defined below), which were determined based on the volume weighted average price of MasTec Inc.'s common stock for a specified period ended on January 10, 2023. 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) Current Pledged Shares are divided into thirty components split into two tranches (each, a "Tranche") of fifteen components each. The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the settlement date of each component in the first ("Tranche 1") or second ("Tranche 2") Tranche, as applicable (or on which to base the amount of cash to be delivered to the buyer on such settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $78.5147 (the "Floor Price"), the reporting person will deliver to the buyer all of the Current Pledged Shares for the applicable component;

F4 · price: (Continued from Footnote 3) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $124.7512 (the " Tranche 1 Cap Price") in the case of a component in Tranche 1, or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price") in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price; and

F5 · price: (Continued from Footnote 4) (c) if such Settlement Price is greater than the Tranche 1 Cap Price in the case of a component in Tranche 1 or greater than the Tranche 2 Cap Price in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the applicable Cap Price, and the denominator of which is such Settlement Price.

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between August 19, 2024 and September 8, 2025.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between August 19, 2024 and September 8, 2025.

SEC source: 0000899243-23-001705 · doc4.xml · derivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 775,000

Underlying: Common Stock · 775,000 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F2 · derivative.exercise_price: On November 28, 2022, (i) the JR Trust and the buyer entered into an agreement to terminate the 2019 Forward Sale Contract to which it was a party with respect to all 212,500 shares covered thereby, with the JR Trust retaining ownership of all such shares, and (ii) the reporting person and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to which the reporting person is a party to reduce the number of shares covered thereby to 387,500 shares (the "Current Pledged Shares") of MasTec, Inc. common stock and to amend the Floor Price (as defined below) and the Cap Price (as defined below), which were determined based on the volume weighted average price of MasTec Inc.'s common stock for a specified period ended on January 10, 2023. 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) Current Pledged Shares are divided into thirty components split into two tranches (each, a "Tranche") of fifteen components each. The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the settlement date of each component in the first ("Tranche 1") or second ("Tranche 2") Tranche, as applicable (or on which to base the amount of cash to be delivered to the buyer on such settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $78.5147 (the "Floor Price"), the reporting person will deliver to the buyer all of the Current Pledged Shares for the applicable component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $124.7512 (the " Tranche 1 Cap Price") in the case of a component in Tranche 1, or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price") in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price; and

F5 · derivative.exercise_price: (Continued from Footnote 4) (c) if such Settlement Price is greater than the Tranche 1 Cap Price in the case of a component in Tranche 1 or greater than the Tranche 2 Cap Price in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the applicable Cap Price, and the denominator of which is such Settlement Price.

F1 · kind: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F2 · kind: On November 28, 2022, (i) the JR Trust and the buyer entered into an agreement to terminate the 2019 Forward Sale Contract to which it was a party with respect to all 212,500 shares covered thereby, with the JR Trust retaining ownership of all such shares, and (ii) the reporting person and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to which the reporting person is a party to reduce the number of shares covered thereby to 387,500 shares (the "Current Pledged Shares") of MasTec, Inc. common stock and to amend the Floor Price (as defined below) and the Cap Price (as defined below), which were determined based on the volume weighted average price of MasTec Inc.'s common stock for a specified period ended on January 10, 2023. 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) Current Pledged Shares are divided into thirty components split into two tranches (each, a "Tranche") of fifteen components each. The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the settlement date of each component in the first ("Tranche 1") or second ("Tranche 2") Tranche, as applicable (or on which to base the amount of cash to be delivered to the buyer on such settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $78.5147 (the "Floor Price"), the reporting person will deliver to the buyer all of the Current Pledged Shares for the applicable component;

F4 · kind: (Continued from Footnote 3) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $124.7512 (the " Tranche 1 Cap Price") in the case of a component in Tranche 1, or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price") in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price; and

F5 · kind: (Continued from Footnote 4) (c) if such Settlement Price is greater than the Tranche 1 Cap Price in the case of a component in Tranche 1 or greater than the Tranche 2 Cap Price in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the applicable Cap Price, and the denominator of which is such Settlement Price.

F1 · price: As previously reported, on November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts (the "2019 Forward Sale Contracts") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the " Initially Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contracts were amended, effectively eliminating any obligation of the JR Trust to deliver Initial Pledged Shares and reducing the reporting person's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (defined below)

F2 · price: On November 28, 2022, (i) the JR Trust and the buyer entered into an agreement to terminate the 2019 Forward Sale Contract to which it was a party with respect to all 212,500 shares covered thereby, with the JR Trust retaining ownership of all such shares, and (ii) the reporting person and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to which the reporting person is a party to reduce the number of shares covered thereby to 387,500 shares (the "Current Pledged Shares") of MasTec, Inc. common stock and to amend the Floor Price (as defined below) and the Cap Price (as defined below), which were determined based on the volume weighted average price of MasTec Inc.'s common stock for a specified period ended on January 10, 2023. 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) Current Pledged Shares are divided into thirty components split into two tranches (each, a "Tranche") of fifteen components each. The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the settlement date of each component in the first ("Tranche 1") or second ("Tranche 2") Tranche, as applicable (or on which to base the amount of cash to be delivered to the buyer on such settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $78.5147 (the "Floor Price"), the reporting person will deliver to the buyer all of the Current Pledged Shares for the applicable component;

F4 · price: (Continued from Footnote 3) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $124.7512 (the " Tranche 1 Cap Price") in the case of a component in Tranche 1, or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price") in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price; and

F5 · price: (Continued from Footnote 4) (c) if such Settlement Price is greater than the Tranche 1 Cap Price in the case of a component in Tranche 1 or greater than the Tranche 2 Cap Price in the case of a component in Tranche 2, the reporting person will deliver to the buyer the number of shares equal to one hundred percent (100%) of Current Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the applicable Cap Price, and the denominator of which is such Settlement Price.

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between August 19, 2024 and September 8, 2025.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between August 19, 2024 and September 8, 2025.

SEC source: 0001209191-22-021351 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,231,830

SEC source: 0001209191-22-019260 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,168,553

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

SEC source: 0001415889-22-002539 · form4-03042022_040332.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,975

SEC source: 0001209191-21-022115 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,192,582

SEC source: 0001209191-21-020863 · doc4.xml · nonDerivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,134,656

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

SEC source: 0001179110-21-002961 · edgar.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,242

SEC source: 0001209191-21-020863 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,153,454

F1 · shares: Represents shares donated to Christopher Columbus High School.

SEC source: 0001209191-20-020703 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,155,954

SEC source: 0001179110-20-003791 · edgar.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,940

SEC source: 0001209191-20-004845 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,990,937

F1 · shares: Represents shares donated to a charitable organization.

SEC source: 0000899243-19-027621 · doc4.xml · derivative · entry 6

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 212,500

Underlying: Common Stock · 212,500 shares

Expires not disclosed

F5 · derivative.exercise_price: On November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Pledged Shares during the term of the pledge.

F6 · derivative.exercise_price: (Continued from Footnote 5) The contracts obligate the reporting person and the JR Trust to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components for each contract), at Jose Mas's or the JR Trust's option, as applicable, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash. The number of shares of MasTec, Inc. common stock to be delivered to the buyer on the settlement date (or on which to base the amount of cash to be delivered to the buyer on the settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $61.794 (the "Floor Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer all of the Pledged Shares for the applicable component;

F7 · derivative.exercise_price: (Continued from Footnote 6) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price and

F8 · derivative.exercise_price: (Continued from Footnote 7) (c) if such Settlement Price is greater than the Cap Price, the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the Cap Price, and the denominator of which is such Settlement Price.

F9 · derivative.exercise_price: In connection with the reporting person's and the JR Trust's entry into the forward contracts described in Footnote (5), Jose Mas was entitled to receive aggregate net cash payments (amounts receivable by him upon entry into the forward contract) of $45,226,715.94 and the JR Trust was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $12,400,873.73. Such amounts were determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F5 · kind: On November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Pledged Shares during the term of the pledge.

F6 · kind: (Continued from Footnote 5) The contracts obligate the reporting person and the JR Trust to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components for each contract), at Jose Mas's or the JR Trust's option, as applicable, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash. The number of shares of MasTec, Inc. common stock to be delivered to the buyer on the settlement date (or on which to base the amount of cash to be delivered to the buyer on the settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $61.794 (the "Floor Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer all of the Pledged Shares for the applicable component;

F7 · kind: (Continued from Footnote 6) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price and

F8 · kind: (Continued from Footnote 7) (c) if such Settlement Price is greater than the Cap Price, the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the Cap Price, and the denominator of which is such Settlement Price.

F9 · kind: In connection with the reporting person's and the JR Trust's entry into the forward contracts described in Footnote (5), Jose Mas was entitled to receive aggregate net cash payments (amounts receivable by him upon entry into the forward contract) of $45,226,715.94 and the JR Trust was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $12,400,873.73. Such amounts were determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F5 · price: On November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Pledged Shares during the term of the pledge.

F6 · price: (Continued from Footnote 5) The contracts obligate the reporting person and the JR Trust to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components for each contract), at Jose Mas's or the JR Trust's option, as applicable, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash. The number of shares of MasTec, Inc. common stock to be delivered to the buyer on the settlement date (or on which to base the amount of cash to be delivered to the buyer on the settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $61.794 (the "Floor Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer all of the Pledged Shares for the applicable component;

F7 · price: (Continued from Footnote 6) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price and

F8 · price: (Continued from Footnote 7) (c) if such Settlement Price is greater than the Cap Price, the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the Cap Price, and the denominator of which is such Settlement Price.

F9 · price: In connection with the reporting person's and the JR Trust's entry into the forward contracts described in Footnote (5), Jose Mas was entitled to receive aggregate net cash payments (amounts receivable by him upon entry into the forward contract) of $45,226,715.94 and the JR Trust was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $12,400,873.73. Such amounts were determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F10 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between December 5, 2022 and December 16, 2022.

F10 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between December 5, 2022 and December 16, 2022.

F11 · ownership.nature: Shares held by the JR Trust. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purpose of Section 16 or for any other purpose.

SEC source: 0000899243-19-027621 · doc4.xml · derivative · entry 5

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 775,000

Underlying: Common Stock · 775,000 shares

Expires not disclosed

F5 · derivative.exercise_price: On November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Pledged Shares during the term of the pledge.

F6 · derivative.exercise_price: (Continued from Footnote 5) The contracts obligate the reporting person and the JR Trust to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components for each contract), at Jose Mas's or the JR Trust's option, as applicable, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash. The number of shares of MasTec, Inc. common stock to be delivered to the buyer on the settlement date (or on which to base the amount of cash to be delivered to the buyer on the settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $61.794 (the "Floor Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer all of the Pledged Shares for the applicable component;

F7 · derivative.exercise_price: (Continued from Footnote 6) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price and

F8 · derivative.exercise_price: (Continued from Footnote 7) (c) if such Settlement Price is greater than the Cap Price, the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the Cap Price, and the denominator of which is such Settlement Price.

F9 · derivative.exercise_price: In connection with the reporting person's and the JR Trust's entry into the forward contracts described in Footnote (5), Jose Mas was entitled to receive aggregate net cash payments (amounts receivable by him upon entry into the forward contract) of $45,226,715.94 and the JR Trust was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $12,400,873.73. Such amounts were determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F5 · kind: On November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Pledged Shares during the term of the pledge.

F6 · kind: (Continued from Footnote 5) The contracts obligate the reporting person and the JR Trust to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components for each contract), at Jose Mas's or the JR Trust's option, as applicable, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash. The number of shares of MasTec, Inc. common stock to be delivered to the buyer on the settlement date (or on which to base the amount of cash to be delivered to the buyer on the settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $61.794 (the "Floor Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer all of the Pledged Shares for the applicable component;

F7 · kind: (Continued from Footnote 6) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price and

F8 · kind: (Continued from Footnote 7) (c) if such Settlement Price is greater than the Cap Price, the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the Cap Price, and the denominator of which is such Settlement Price.

F9 · kind: In connection with the reporting person's and the JR Trust's entry into the forward contracts described in Footnote (5), Jose Mas was entitled to receive aggregate net cash payments (amounts receivable by him upon entry into the forward contract) of $45,226,715.94 and the JR Trust was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $12,400,873.73. Such amounts were determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F5 · price: On November 19, 2019, the reporting person and the Jose Ramon Mas Irrevocable Family Trust, one of the trustees of which is the reporting person's spouse (the "JR Trust"), entered into prepaid variable forward sale contracts with an unaffiliated third party buyer. The reporting person pledged an aggregate of 775,000 shares and the JR Trust pledged an aggregate of 212,500 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure their obligations under the contracts, and retained ownership and voting rights in their respective portions of the Pledged Shares during the term of the pledge.

F6 · price: (Continued from Footnote 5) The contracts obligate the reporting person and the JR Trust to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components for each contract), at Jose Mas's or the JR Trust's option, as applicable, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash. The number of shares of MasTec, Inc. common stock to be delivered to the buyer on the settlement date (or on which to base the amount of cash to be delivered to the buyer on the settlement date) is to be determined as follows: (a) if the volume-weighted average price of MasTec, Inc. common stock on the designated valuation date for the applicable component (each, a "Settlement Price") is less than or equal to $61.794 (the "Floor Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer all of the Pledged Shares for the applicable component;

F7 · price: (Continued from Footnote 6) (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of the Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price and the denominator of which is such Settlement Price and

F8 · price: (Continued from Footnote 7) (c) if such Settlement Price is greater than the Cap Price, the reporting person or the JR Trust, as applicable, will deliver to the buyer the number of shares equal to one hundred percent (100%) of Pledged Shares for the applicable component multiplied by a fraction, the numerator of which is the Floor Price plus the excess of such Settlement Price over the Cap Price, and the denominator of which is such Settlement Price.

F9 · price: In connection with the reporting person's and the JR Trust's entry into the forward contracts described in Footnote (5), Jose Mas was entitled to receive aggregate net cash payments (amounts receivable by him upon entry into the forward contract) of $45,226,715.94 and the JR Trust was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $12,400,873.73. Such amounts were determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F10 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between December 5, 2022 and December 16, 2022.

F10 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, occurs between December 5, 2022 and December 16, 2022.

SEC source: 0000899243-19-027621 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · Indirect

Disclosed balance after: 1,197,414

F1 · shares: Represents shares donated to a charitable organization.

F2 · balance_after: Shares owned of record by Jose Ramon Mas Holdings I, LLC, a Florida limited liability company ("Jose Ramon Mas Holdings"). The sole member of Jose Ramon Mas Holdings is Jose Ramon Mas Holdings, LLC, a Florida limited liability company, which is wholly owned by Mr. Jose Ramon Mas.

SEC source: 0001209191-19-020029 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,993,437

SEC source: 0001209191-18-063689 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,927,773

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

SEC source: 0001179110-18-013971 · edgar.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,786

SEC source: 0001209191-18-020370 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,984,120

SEC source: 0001209191-18-006913 · doc5.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · Indirect

Disclosed balance after: 1,202,414

F1 · shares: Represents shares donated to Carrollton School of the Sacred Heart in Miami.

F2 · balance_after: Shares owned of record by Jose Ramon Mas Holdings I, LLC, a Florida limited liability company ("Jose Ramon Mas Holdings"). The sole member of Jose Ramon Mas Holdings is Jose Ramon Mas Holdings, LLC, a Florida limited liability company, which is wholly owned by Mr. Jose Ramon Mas.

SEC source: 0001209191-17-066811 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,932,498

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

SEC source: 0001209191-17-064172 · doc4.xml · derivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,371

Underlying: Common Stock · 7,371 shares

Expires 2027-12-04

SEC source: 0001209191-17-064172 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,823

SEC source: 0001209191-17-022066 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,980,933

SEC source: 0001209191-17-021746 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,930,483

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

SEC source: 0001209191-17-017090 · doc4.xml · derivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,242

Underlying: Common Stock · 5,242 shares

Expires 2027-03-01

F1 · derivative.exercise_date: The stock options vest 100% on the one-year anniversary of the date of grant.

SEC source: 0001209191-17-017090 · doc4.xml · nonDerivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,312