MTZ

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

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,279,939

SEC source: 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: 0000015615-25-000027 · wk-form4_1742506598.xml · nonDerivative · entry 1

de Cardenas Alberto · CIK 0001250037 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,668

SEC source: 0000015615-25-000025 · wk-form4_1742506389.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 214,356

F1 · balance_after: Includes 87,095 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries.

SEC source: 0000015615-25-000023 · wk-form4_1742506147.xml · nonDerivative · entry 1

DiMarco Paul · CIK 0001965258 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,478

SEC source: 0000015615-25-000043 · wk-form4_1743021645.xml · nonDerivative · entry 1

Love Timothy Michael · CIK 0001345434 · CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,307

SEC source: 0000015615-25-000014 · wk-form4_1740002052.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,517

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

SEC source: 0000015615-25-000014 · wk-form4_1740002052.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,591

SEC source: 0000015615-25-000012 · wk-form4_1740001877.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,376

SEC source: 0000015615-25-000013 · wk-form4_1740001942.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,106

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

SEC source: 0000015615-25-000013 · wk-form4_1740001942.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,173

SEC source: 0000015615-25-000010 · wk-form4_1740001613.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,870

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

SEC source: 0000015615-25-000010 · wk-form4_1740001613.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,937

SEC source: 0000015615-25-000009 · wk-form4_1740001476.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,782

SEC source: 0000015615-25-000008 · wk-form4_1740001412.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,310

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

SEC source: 0000015615-25-000008 · wk-form4_1740001412.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,353

F1 · shares: These shares of Common Stock represent the portion of the reporting person's quarterly compensation that the reporting person was required to or elected to receive in the form of shares of Common Stock. The number of shares was calculated based on the closing price of a share of Common Stock on February 14, 2025. Pursuant to the Issuer's Deferred Fee Plan for Directors, the reporting person elected to defer the receipt of 193 of such shares to a future date in accordance with the terms of such plan.

SEC source: 0000015615-24-000132 · wk-form4_1733520879.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,633

SEC source: 0000015615-24-000130 · wk-form4_1732905130.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 187,202

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 10,000 shares sold under the plan represent 5.1% of the shares owned by Mr. Apple.

F2 · balance_after: Includes 87,095 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries.

SEC source: 0000015615-24-000128 · wk-form4_1732905015.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,478

F1 · shares: These shares were sold in four separate transactions, each with a price of $145.00. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000125 · wk-form4_1732052484.xml · nonDerivative · entry 2

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,259

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

SEC source: 0000015615-24-000125 · wk-form4_1732052484.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,333

SEC source: 0000015615-24-000124 · wk-form4_1732052441.xml · nonDerivative · entry 2

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,869

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

SEC source: 0000015615-24-000124 · wk-form4_1732052441.xml · nonDerivative · entry 1

Dwyer Robert J · CIK 0001307141 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,937

SEC source: 0000015615-24-000123 · wk-form4_1732052330.xml · nonDerivative · entry 1

JOHNSON JULIA L · CIK 0001221442 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,072

SEC source: 0000015615-24-000121 · wk-form4_1732052155.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,478

SEC source: 0000015615-24-000122 · wk-form4_1732052225.xml · nonDerivative · entry 2

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,833

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

SEC source: 0000015615-24-000122 · wk-form4_1732052225.xml · nonDerivative · entry 1

Palomarez Javier Alberto · CIK 0001662017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,901

SEC source: 0000015615-24-000120 · wk-form4_1732052103.xml · nonDerivative · entry 2

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,966

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

SEC source: 0000015615-24-000120 · wk-form4_1732052103.xml · nonDerivative · entry 1

Parker Ava L · CIK 0001526207 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,052

SEC source: 0000015615-24-000113 · wk-form4_1731534184.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,173

SEC source: 0000015615-24-000111 · wk-form4_1731101668.xml · nonDerivative · entry 1

Love Timothy Michael · CIK 0001345434 · CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,196

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 7

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 197,202

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F8 · balance_after: Includes 97,095 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 6

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 197,296

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 18 separate transactions, with prices ranging from $137.6000 to $138.4721 for an average weighted sales price of $137.9261. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 5

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 198,136

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 39 separate transactions, with prices ranging from $136.5810 to $137.5400 for an average weighted sales price of $137.0407. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 4

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 201,389

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 51 separate transactions, with prices ranging from $135.5759 to $136.5700 for an average weighted sales price of $136.1525. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 3

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 206,727

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 71 separate transactions, with prices ranging from $134.5654 to $135.5400 for an average weighted sales price of $135.1790. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 2

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 212,683

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 29 separate transactions, with prices ranging from $133.5213 to $134.4000 for an average weighted sales price of $133.9758. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000109 · wk-form4_1730843992.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 215,014

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 19,023 shares sold under the plan represent 8.8% of the shares owned by Mr. Apple.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 34 separate transactions, with prices ranging from $132.5100 to $133.4646 for an average weighted sales price of $133.0268. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000100 · wk-form4_1729110991.xml · nonDerivative · entry 1

DiMarco Paul · CIK 0001965258 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,907

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

F2 · balance_after: On April 11, 2023, the reporting person filed a Form 3 which inadvertently overstated the number of shares held directly by the reporting person by 531 shares. This Form 4 corrects the total amount of securities beneficially owned directly by the reporting person in Column 5.

SEC source: 0000015615-24-000098 · wk-form4_1729110629.xml · nonDerivative · entry 1

Love Timothy Michael · CIK 0001345434 · CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,796

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

SEC source: 0000015615-24-000096 · wk-form4_1728506037.xml · nonDerivative · entry 2

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 216,225

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 977 shares sold under the plan represent less than 1% of the shares owned by Mr. Apple.

F3 · balance_after: Includes 116,118 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries.

SEC source: 0000015615-24-000096 · wk-form4_1728506037.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 216,402

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 977 shares sold under the plan represent less than 1% of the shares owned by Mr. Apple.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 8 separate transactions, with prices ranging from $130.00 to $130.08 for an average weighted sales price of $130.0355. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000094 · wk-form4_1727211273.xml · nonDerivative · entry 2

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 217,202

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 20,000 shares sold under the plan represent only 8% of the shares owned by Mr. Apple.

F3 · balance_after: Includes 117,095 shares of MasTec common stock contributed by the reporting person to The Apple Family Trust of which the reporting person and his wife are trustees and beneficiaries.

SEC source: 0000015615-24-000094 · wk-form4_1727211273.xml · nonDerivative · entry 1

Apple Robert E · CIK 0001382697 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 227,202

F1 · shares: Mr. Apple, 74 years old, is systematically reducing his portfolio concentration in MasTec shares through a 10b5-1 plan, which has more than one pricing tranche. These 20,000 shares sold under the plan represent only 8% of the shares owned by Mr. Apple.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 91 separate transactions, with prices ranging from $125.00 to $125.26 for an average weighted sales price of $125.04. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000015615-24-000092 · wk-form4_1726864250.xml · nonDerivative · entry 1

Campbell C Robert · CIK 0001307261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,173

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in 19 separate transactions, with prices ranging from $116.1450 to $116.3650 for an average weighted sales price of $116.2591. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold in each transaction.

SEC source: 0000950170-24-105185 · 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: 0000950170-24-105176 · ownership.xml · derivative · entry 2

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 364,850

Underlying: Common Stock · 364,850 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 16, 2024, the reporting person and the buyer entered into a second amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ( "Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $78.5147 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · kind: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · kind: On August 16, 2024, the reporting person and the buyer entered into a second amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ( "Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $78.5147 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · price: On August 16, 2024, the reporting person and the buyer entered into a second amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ( "Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $78.5147 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 4, 2026.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 4, 2026.

SEC source: 0000950170-24-105176 · ownership.xml · derivative · entry 1

MAS JOSE RAMON · CIK 0001079760 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 387,500 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · derivative.exercise_price: On August 16, 2024, the reporting person and the buyer entered into a second amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · derivative.exercise_price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ( "Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $78.5147 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · derivative.exercise_price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · kind: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · kind: On August 16, 2024, the reporting person and the buyer entered into a second amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · kind: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ( "Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $78.5147 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · kind: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F1 · price: As previously reported, the reporting person is party to a prepaid variable forward sale contract (as amended to date, the "Forward Sale Contract") with an unaffiliated third party buyer. The reporting person pledged an aggregate of 387,500 shares (the "2022 Pledged Shares") of MasTec, Inc. common stock to secure his obligations under the Forward Sale Contract, and retained ownership and voting rights in the 2022 Pledged Shares during the term of the pledge.

F2 · price: On August 16, 2024, the reporting person and the buyer entered into a second amendment to the Forward Sale Contract (as so further amended, the "Amended Agreement") to amend the Floor Price (as defined below) and the Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on September 9, 2024, and to appropriately adjust the number of shares to be delivered on the respective valuation date for each Tranche 1 Component, with such adjustment resulting in a reduction in the number of 2022 Pledged Shares to 364,850 shares (the " Pledged Shares"). The Amended Agreement provides for the settlement of the transaction, at the reporting person's option, in cash or shares of MasTec, Inc. common stock.

F3 · price: (Continued from Footnote 2) The Pledged Shares are divided into two tranches (each, a "Tranche") of 15 components each ( "Tranche 1 Components" or "Tranche 2 Components"). The number of shares of MasTec, Inc. common stock to be potentially delivered to the buyer on the valuation date of each Tranche 1 Component or Tranche 2 Component (or on which to base the amount of cash to be delivered to the buyer on such valuation date) is to be determined as follows: (a) if the VWAP of MasTec, Inc. common stock on the valuation date for the applicable Tranche 1 Component or Tranche 2 Component (each, a "Valuation Price") is less than or equal to $97.3535 (the "Tranche 1 Floor Price") or $78.5147 (the "Tranche 2 Floor Price," and each of the Tranche 1 Floor Price and Tranche 2 Floor Price, a "Floor Price"), respectively, then the reporting person will deliver to the buyer all of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component;

F4 · price: (Continued from Footnote 3) (b) if such Valuation Price for the Tranche 1 Component or Tranche 2 Component is greater than the Tranche 1 Floor Price or Tranche 2 Floor Price, respectively, but less than or equal to $127.6413 (the "Tranche 1 Cap Price") or $136.9646 (the "Tranche 2 Cap Price," and each of the Tranche 1 Cap Price and Tranche 2 Cap Price, a "Cap Price"), respectively, then the reporting person will deliver to the buyer the number of shares equal to 100% of the Pledged Shares for the applicable Tranche 1 Component or Tranche 2 Component multiplied by the quotient of the applicable Floor Price divided by such Valuation Price; and

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

F6 · derivative.exercise_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 4, 2026.

F6 · derivative.expiration_date: Each component is exercisable on the same date as it expires, which date for each component, is between August 17, 2026 and September 4, 2026.

SEC source: 0000015615-24-000090 · wk-form4_1724704892.xml · nonDerivative · entry 1

Csiszar Ernst N · CIK 0001341639 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,000