What SEC filings does MasTec, Inc. submit to the SEC?

MasTec, Inc. (MTZ) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about MTZ?

A Form 4 for MTZ discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from MasTec, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for MTZ?

The 10-K is MasTec, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all MTZ SEC filings directly on EDGAR?

You can view all historical MasTec, Inc. filings on the SEC EDGAR company page for MTZ. Each filing card on this page links directly to the original SEC document.

How often does MasTec, Inc. file with the SEC?

MasTec, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling MTZ shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

MTZ SEC Filing News — MasTec, Inc.

Latest SEC filings for MasTec, Inc. (MTZ) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-08-18.

MasTec, Inc., an infrastructure engineering and construction company, provides engineering, building, installation, maintenance, and upgrade services for communications, energy, utility, and other infrastructure primarily in the United States and Canada. It operates through five segments: Communications, Clean Energy and Infrastructure, Power Delivery, Pipeline Infrastructure, and Other. The company builds infrastructure for wireless and wireline/fiber communications; clean energy infrastructure…

Sector: Industrials Industry: Engineering & Construction Market Cap: $15.3B CIK: 15615

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for MTZ currently lean bearish. Of the 20 filing records displayed, 1 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

MTZ Filing Activity Snapshot 2026-05-22 — 2026-08-18

Insider Transactions (Form 4)

0 buys vs 1 sell

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$2.41M

Csiszar Ernst N (Director) · 2026-06-05

6,500 shares · Form 4

Form 144 Notices

Proposed insider sale filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 11 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 11 filings in this group are Form 4s for MasTec, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 11 insider filings shown, the breakdown is 8 compensation award, 2 other reported transaction and 1 open-market sale. 1 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×8: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Other reported transaction ×2: The filing reports a transaction type that does not map to a routine purchase, sale, award or withholding.
Open-market sale ×1: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Miranda Manuel Benito (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	152	—	—

Filing: Form 4 (Insider Transaction) Insider: Miranda Manuel Benito (Director) Shares: 152

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Palomarez Javier Alberto (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	139	—	—
`F`	Tax withholding on vested shares	31	$297.59	$9.2K

Filing: Form 4 (Insider Transaction) Insider: Palomarez Javier Alberto (Director) Shares: 170

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Csiszar Ernst N (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	152	—	—
`F`	Tax withholding on vested shares	34	$297.59	$10.1K

Filing: Form 4 (Insider Transaction) Insider: Csiszar Ernst N (Director) Shares: 186

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Campbell C Robert (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	139	—	—

Filing: Form 4 (Insider Transaction) Insider: Campbell C Robert (Director) Shares: 139

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Spiro Alex (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	139	—	—

Filing: Form 4 (Insider Transaction) Insider: Spiro Alex (Director) Shares: 139

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Dwyer Robert J (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	139	—	—
`F`	Tax withholding on vested shares	31	$297.59	$9.2K

Filing: Form 4 (Insider Transaction) Insider: Dwyer Robert J (Director) Shares: 170

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

JOHNSON JULIA L (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	139	—	—

Filing: Form 4 (Insider Transaction) Insider: JOHNSON JULIA L (Director) Shares: 139

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-18

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

Parker Ava L (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	177	—	—
`F`	Tax withholding on vested shares	20	$297.59	$6.0K

Filing: Form 4 (Insider Transaction) Insider: Parker Ava L (Director) Shares: 197

View on SEC EDGAR → Open Filing Document →

Form 4 Other reported transaction Tax / Compensation Filing 2026-08-13

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

MAS JOSE RAMON (Director, CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The filing reports a transaction type that does not map to a routine purchase, sale, award or withholding.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`J`	Other transaction derivative · Forward sale contract (potential obligation to sell)	340,794	—	—
`J`	Other transaction derivative · Forward sale contract (potential obligation to sell)	340,794	—	—

Filing: Form 4 (Insider Transaction) Insider: MAS JOSE RAMON (Director, CEO)

View on SEC EDGAR → Open Filing Document →

Form 4 Other reported transaction Tax / Compensation Filing 2026-08-13

MTZ insider Form 4 filed for equity award, exercise, or tax withholding

MAS JORGE (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The filing reports a transaction type that does not map to a routine purchase, sale, award or withholding.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`J`	Other transaction derivative · Forward sale contract (potential obligation to sell)	1,099,335	—	—
`J`	Other transaction derivative · Forward sale contract (potential obligation to sell)	1,099,335	—	—

Filing: Form 4 (Insider Transaction) Insider: MAS JORGE (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-06-05

MTZ insider Csiszar Ernst N (Director) sold 6,500 shares (~$2.41M)

Csiszar Ernst N, listed as Director at MASTEC INC, reported an open-market sale of 6,500 MTZ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	6,500	$371.17	$2.41M

Filing: Form 4 (Insider Transaction) Insider: Csiszar Ernst N (Director) Shares: 6,500 Est. Value: $2.41M

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 1 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. MasTec, Inc. has 1 such notice in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-06-03

MTZ Form 144 filed for proposed insider sale by ERNEST N CSISZAR (6,500 shares) ~$2.41M

ERNEST N CSISZAR filed a Form 144 with the SEC indicating intent to sell MTZ (MASTEC INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: ERNEST N CSISZAR Shares: 6,500 Est. Value: $2.41M

View on SEC EDGAR → Open Filing Document →

Material Events 7 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 7 in this period for MasTec, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-17

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-08-10

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-31

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-30

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-20

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-07

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-22

MTZ filed 8-K — material company event

MASTEC INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for MasTec, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-07-30

MTZ filed Quarterly Report (10-Q)

MASTEC INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

How we classify MasTec, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on MTZ. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — MTZ SEC Filings

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MTZ Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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