MasTec, Inc.: 5%+ holders

As of November 7, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of MasTec, Inc. The largest reported stake is Jorge Mas', at 14.8%. 6 filings are on record since August 22, 2025 (Schedule 13D/A, August 13, 2026).

BlackRock, Inc. also filed stake reports on 1596 other companies ↓

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Key facts

• Filing 2026-08-13 · Reporting person: Jorge Mas · Sole voting: 10,222,170 · Shared voting: 1,649,941 · Sole dispositive: 10,222,170 · Shared dispositive: 1,649,941 · SCHEDULE 13D/A, 2026-08-13
• Filing 2026-08-13 · Reporting person: Jose Ramon Mas · Sole voting: 4,535,149 · Shared voting: 1,649,941 · Sole dispositive: 4,535,149 · Shared dispositive: 1,649,941 · SCHEDULE 13D/A, 2026-08-13
• Filing 2026-07-29 · Reporting person: BlackRock, Inc. · Sole voting: 6,077,505 · Shared voting: 0 · Sole dispositive: 6,400,155 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-07-29
• Filed 2026-03-27 · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
• Filed 2025-08-22 · Holder: Jose Ramon Mas · Percent: 7.8% · SCHEDULE 13D/A

MasTec, Inc. has 6 Schedule 13D or 13G filings on record since 2025-08-22. 3 holders' latest filing reports 5% or more of common stock, par value $.10 per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on MasTec, Inc. and the records around it.

MasTec, Inc. elsewhere on the record

• Leadership changes Jul 2026
• Who owns it

Companies that share a holder

• BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
• The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)

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Voting and dispositive power, as filed

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The latest filing identifies MasTec, Inc. by CUSIP 576323109 and gives its principal executive office as 800 S. Douglas Road, 12th Floor, Coral Gables, FL 33134 (SCHEDULE 13D/A, 2026-08-13).

Source of funds (Item 3)

Share ownership by each of the persons reporting on this Schedule 13D reflect transfers among certain of the reporting persons as well as grants of equity compensation to Mr. Mas since January 13, 2023, all as previously reported on Forms 4 filed by Mr. Mas.Jorge Mas, SCHEDULE 13D/A, 2026-08-13

Share ownership by each of the persons reporting on this Schedule 13D reflect transfers among certain of the reporting persons as well as grants of equity compensation to Mr. Mas since November 19, 2019, all as previously reported on Forms 4 filed by Mr. Mas.Jose Ramon Mas, SCHEDULE 13D/A, 2026-08-13

Purpose of Transaction (Item 4)

Jose Ramon Mas

The purpose of this filing to is report entry by Jose Ramon Mas on August 10, 2026 into an amendment (the "Fourth Amendment") to the previously reported prepaid variable forward sale contract entered into by Jose Ramon Mas with an unaffiliated party (the "JR 2019 Prepaid Forward Contract," and, as amended to date, the "Prepaid Forward Contract"). The Fourth Amendment amends the Floor Price (as defined below) and 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 11, 2026. The Prepaid Forward Contract provides for the settlement of the transaction, at the option of Jose Ramon Mas, in cash or in Shares. At settlement Jose Ramon Mas will be obligated to deliver to the buyer, on the applicable date in August or September 2027 or 2028 for the applicable component (each, a "Valuation Date") in the first ("Tranche 1") or second ("Tranche 2") tranche, as applicable, of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"), at Jose Ramon Mas's option, up to 100% of the number of Shares pledged for such component or an equivalent amount of cash. Jose Ramon Mas entered into the JR 2019 Prepaid Forward Contract to provide funds for investment in the Miami Major League Soccer franchise. For more information on the terms of the Prepaid Forward Contract, please see Item 6 below.Item 4 of the SCHEDULE 13D/A filed 2026-08-13

Jorge Mas

The purpose of this filing to is report the entry by JM Holdings I on August 10, 2026 into an amendment (the "Fourth Amendment") to the previously reported prepaid variable forward sale contract entered into by JM Holdings I with an unaffiliated party (the "2019 Prepaid Forward Contract," and, as amended to date, the "Prepaid Forward Contract"). The Fourth Amendment amends the Floor Price (as defined below) and 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 Prepaid Forward Contract provides for the settlement of the transaction, at the option of JM Holdings I, in cash or in Shares. At settlement JM Holdings I will be obligated to deliver to the buyer, on the applicable date in August or September 2027 or 2028 for the applicable component (each, a "Valuation Date") in the first ("Tranche 1") or second ("Tranche 2") tranche, as applicable, of 15 components each ("Tranche 1 Components" or "Tranche 2 Components"), at JM Holdings I's option, up to 100% of the number of Shares pledged for such component or an equivalent amount of cash. JM Holdings I entered into the 2019 Prepaid Forward Contract to provide funds for investment in the Miami Major League Soccer franchise. For more information on the terms of the Prepaid Forward Contract, please see Item 6 below.Item 4 of the SCHEDULE 13D/A filed 2026-08-13

Timeline

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Questions about who owns MasTec, Inc.

Who owns MasTec, Inc.?

On this page, 3 holders' latest ownership filings report 5% or more of MasTec, Inc.: Jorge Mas (14.8%, Schedule 13D/A, filed 2026-08-13), BlackRock, Inc. (8.1%, Schedule 13G/A, filed 2026-07-29) and Jose Ramon Mas (7.7%, Schedule 13D/A, filed 2026-08-13).

Who are the largest shareholders of MasTec, Inc.?

By the share each holder's latest filing reports, the largest holders of MasTec, Inc. on this page are Jorge Mas (14.8%), BlackRock, Inc. (8.1%) and Jose Ramon Mas (7.7%).

When did Jorge Mas buy into MasTec, Inc.?

The filings give report dates, not purchase dates. The earliest filing from Jorge Mas on this page is the Schedule 13D/A, filed 2025-08-22, reporting 15%; its latest, Schedule 13D/A filed 2026-08-13, reports 14.8%. That earliest filing is itself an amendment, which updates an earlier report.

Is this an audit or a full list?

Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 6 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.

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Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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