MAS JORGE

SEC source: 0001193125-26-349223 · ownership.xml · derivative · entry 2

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,099,335

Underlying: Common Stock · 1,099,335 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $246.5096 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $350.5914 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · kind: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · kind: On August 10, 2026, JM Holdings I and the buyer entered into a fourth amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $246.5096 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $350.5914 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $246.5096 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $350.5914 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

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

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

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

SEC source: 0001193125-26-349223 · ownership.xml · derivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 1,099,335 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $246.5096 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $350.5914 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · kind: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · kind: On August 10, 2026, JM Holdings I and the buyer entered into a fourth amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $246.5096 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $350.5914 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,099,335 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the Forward Sale Contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge.

F2 · price: On August 10, 2026, JM Holdings I and the buyer entered into a fourth amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date), is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $246.5096 (the "Tranche 1 Floor Price") or $157.3441 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $350.5914 (the "Tranche 1 Cap Price") or $243.0093 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then JM Holdings I will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

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

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

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

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

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,556,686

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

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,540,848

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

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

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,099,335

Underlying: Common Stock · 1,099,335 shares

Expires not disclosed

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 1,176,933 shares

Expires not disclosed

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

SEC source: 0000015615-25-000029 · wk-form4_1742506813.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,556,806

SEC source: 0000950170-24-105185 · ownership.xml · derivative · entry 2

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,176,933

Underlying: Common Stock · 1,176,933 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,250,000 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure its 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, JM Holdings I 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 1,176,933 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

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

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

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

F1 · kind: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,250,000 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure its 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, JM Holdings I 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 1,176,933 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

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

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

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

F1 · price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,250,000 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure its 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, JM Holdings I 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 1,176,933 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

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

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

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

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

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

SEC source: 0000950170-24-105185 · ownership.xml · derivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 1,250,000 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,250,000 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure its 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, JM Holdings I 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 1,176,933 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

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

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

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

F1 · kind: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,250,000 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure its 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, JM Holdings I 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 1,176,933 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

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

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

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

F1 · price: As previously reported, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 1,250,000 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure its 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, JM Holdings I 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 1,176,933 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at JM Holdings I's option, in cash or shares of MasTec, Inc. common stock.

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

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

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

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

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

SEC source: 0000015615-24-000030 · wk-form4_1709847566.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,519,778

SEC source: 0001209191-23-020304 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,437,888

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

SEC source: 0001209191-23-018498 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,471,156

F1 · balance_after: Reflects transfer of 417,700 shares from Jorge Mas Holdings I, LLC to the reporting person and his spouse.

SEC source: 0000899243-23-001704 · doc4.xml · derivative · entry 2

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,250,000

Underlying: Common Stock · 1,250,000 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, on November 19, 2019, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract (the "2019 Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Initially Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contract was amended, reducing JM Holdings I's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (as defined below).

F2 · derivative.exercise_price: On November 28, 2022, JM Holdings I and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to reduce the number of shares covered thereby to 1,250,000 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 JM Holdings I'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"), JM Holdings I 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, JM Holdings I 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, JM Holdings I 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, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract (the "2019 Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Initially Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contract was amended, reducing JM Holdings I's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (as defined below).

F2 · kind: On November 28, 2022, JM Holdings I and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to reduce the number of shares covered thereby to 1,250,000 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 JM Holdings I'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"), JM Holdings I 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, JM Holdings I 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, JM Holdings I 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, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract (the "2019 Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Initially Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contract was amended, reducing JM Holdings I's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (as defined below).

F2 · price: On November 28, 2022, JM Holdings I and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to reduce the number of shares covered thereby to 1,250,000 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 JM Holdings I'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"), JM Holdings I 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, JM Holdings I 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, JM Holdings I 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 to 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 to September 8, 2025.

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

SEC source: 0000899243-23-001704 · doc4.xml · derivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 2,500,000 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, on November 19, 2019, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract (the "2019 Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Initially Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contract was amended, reducing JM Holdings I's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (as defined below).

F2 · derivative.exercise_price: On November 28, 2022, JM Holdings I and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to reduce the number of shares covered thereby to 1,250,000 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 JM Holdings I'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"), JM Holdings I 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, JM Holdings I 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, JM Holdings I 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, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract (the "2019 Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Initially Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contract was amended, reducing JM Holdings I's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (as defined below).

F2 · kind: On November 28, 2022, JM Holdings I and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to reduce the number of shares covered thereby to 1,250,000 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 JM Holdings I'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"), JM Holdings I 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, JM Holdings I 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, JM Holdings I 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, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract (the "2019 Forward Sale Contract") with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Initially Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Initially Pledged Shares during the term of the pledge. As more fully described below, the 2019 Forward Sale Contract was amended, reducing JM Holdings I's obligation to deliver shares of MasTec common stock to the amount of the Current Pledged Shares (as defined below).

F2 · price: On November 28, 2022, JM Holdings I and the buyer entered into an amendment to the 2019 Forward Sale Contract (the "Amended Agreement") to reduce the number of shares covered thereby to 1,250,000 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 JM Holdings I'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"), JM Holdings I 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, JM Holdings I 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, JM Holdings I 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 to 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 to September 8, 2025.

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

SEC source: 0001209191-22-021383 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,009,755

SEC source: 0001209191-22-009287 · doc5.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Indirect

Disclosed balance after: 100,000

F1 · shares: Represents shares donated to FIU Foundation.

F2 · ownership.nature: Shares owned of record by the Mas Family Foundation, Inc., a Florida not-for-profit corporation (the "Family Foundation"), of which the reporting person is the president. The reporting person disclaims beneficial ownership of all shares owned by the Family Foundation.

SEC source: 0001209191-21-022122 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,971,789

F1 · balance_after: Reflects (i) transfer of 3,160,116 shares from Jorge Mas Holdings I, LLC to the reporting person and his spouse, (ii) transfer of 117,700 shares from the reporting person to Jorge Mas Holdings I, LLC, (iii) transfer of 1,099,800 shares from Jorge Mas Holdings I, LLC to the reporting person, (iv) transfer of 300,000 shares from the reporting person and his spouse to Jorge Mas Holdings I, LLC and (v) transfer of 200,000 shares from the reporting person and his spouse to the Jorge Mas Irrevocable Family Trust dated August 7, 2018 (the "Jorge Mas Trust").

SEC source: 0001209191-20-020700 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 296,009

SEC source: 0000899243-19-027617 · doc4.xml · derivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,500,000

Underlying: Common Stock · 2,500,000 shares

Expires not disclosed

F1 · derivative.exercise_price: On November 19, 2019, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge. The contract obligates JM Holdings I to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components), at JM Holdings I's option, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash.

F2 · derivative.exercise_price: (Continued from Footnote 1) 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"), JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable component; (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), JM Holdings I 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

F3 · derivative.exercise_price: (Continued from Footnote 2) (c) if such Settlement Price is greater than the Cap Price, JM Holdings I 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.

F4 · derivative.exercise_price: In connection with JM Holdings I's entry into the forward contract described in Footnote (1), JM Holdings I was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $145,892,632.06. Such amount was determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F1 · kind: On November 19, 2019, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge. The contract obligates JM Holdings I to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components), at JM Holdings I's option, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash.

F2 · kind: (Continued from Footnote 1) 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"), JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable component; (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), JM Holdings I 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

F3 · kind: (Continued from Footnote 2) (c) if such Settlement Price is greater than the Cap Price, JM Holdings I 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.

F4 · kind: In connection with JM Holdings I's entry into the forward contract described in Footnote (1), JM Holdings I was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $145,892,632.06. Such amount was determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F1 · price: On November 19, 2019, Jorge Mas Holdings I, LLC, a Florida limited liability company ("JM Holdings I"), which is controlled by Jorge Mas Holdings, LLC, a Florida limited liability company, of which the reporting person is the sole member, entered into a prepaid variable forward sale contract with an unaffiliated third party buyer. JM Holdings I pledged an aggregate of 2,500,000 shares (the "Pledged Shares") of MasTec, Inc. common stock to secure its obligations under the contract, and retained ownership and voting rights in the Pledged Shares during the term of the pledge. The contract obligates JM Holdings I to deliver to the buyer, on the applicable settlement date for the applicable component (of ten components), at JM Holdings I's option, up to one hundred percent (100%) of the number of Pledged Shares for such component or an equivalent amount of cash.

F2 · price: (Continued from Footnote 1) 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"), JM Holdings I will deliver to the buyer all of the Pledged Shares for the applicable component; (b) if such Settlement Price is greater than the Floor Price but less than or equal to $82.804 (the "Cap Price"), JM Holdings I 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

F3 · price: (Continued from Footnote 2) (c) if such Settlement Price is greater than the Cap Price, JM Holdings I 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.

F4 · price: In connection with JM Holdings I's entry into the forward contract described in Footnote (1), JM Holdings I was entitled to receive aggregate net cash payments (amounts receivable by it upon entry into the forward contract) of $145,892,632.06. Such amount was determined based on the market value of MasTec, Inc. common stock on November 19, 2019.

F5 · 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.

F5 · 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.

F6 · ownership.nature: Shares owned of record by JM Holdings I.

SEC source: 0001209191-19-020032 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,666

SEC source: 0001209191-19-056785 · doc4a.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,666

SEC source: 0001209191-19-056785 · doc4a.xml · nonDerivative · entry 2

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Indirect

Disclosed balance after: 648,941

F1 · shares: This amendment to the reporting person's Form 4, originally filed on March 18, 2019, is filed to report that on August 7, 2018, the Jorge Mas Irrevocable Family Trust dated June 1, 2012 gifted 648,941 shares of common stock of the issuer to the Jorge Mas Irrevocable Family Trust dated August 7, 2018 (the "Jorge Mas Trust"), one of the trustees of which is the reporting person's spouse.

F2 · ownership.nature: Shares held by Jorge Mas 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: 0001209191-17-067637 · doc4.xml · nonDerivative · entry 1

MAS JORGE · CIK 0000920559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,829