MasTec (MTZ) director gets 139-share award, 31 shares withheld for taxes

Rhea-AI Filing Summary

MasTec Inc (MTZ) reported insider equity compensation activity for director Robert J. Dwyer. On 2026-08-14 he received a grant or award of 139 shares of common stock at a stated price of $0.00 per share. On the same date, 31 shares of common stock were disposed of at $297.59 per share, representing shares withheld by MasTec to pay taxes due upon the vesting of restricted stock.

Insider Trade Summary

Net Buyer: 108 shares

Net Buy 2 txns

Insider Dwyer Robert J

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	139	$0.00	$0.00
Tax Withholding	Common Stock F1	31	$297.59	$9K

Holdings After Transaction: Common Stock — 20,960 shares (Direct)

Footnotes (1)

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

Key Figures

Equity award shares: 139 shares Tax-withholding shares: 31 shares Tax-withholding price: $297.59 per share

3 metrics

Equity award shares 139 shares Grant or award of MasTec common stock on 2026-08-14

Tax-withholding shares 31 shares Shares withheld by MasTec to pay taxes on restricted stock vesting

Tax-withholding price $297.59 per share Valuation per share for the 31 shares withheld for tax payment

Key Terms

restricted stock, withheld by the Issuer, tax liability

3 terms

restricted stock financial

"taxes due upon vesting of restricted stock"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

withheld by the Issuer financial

"Shares disposed of represent shares withheld by the Issuer"

tax liability financial

"Payment of tax liability by delivering or withholding securities"

FAQ

What insider transactions did MasTec (MTZ) director Robert J. Dwyer report?

Robert J. Dwyer reported a grant of 139 MasTec common shares and a related disposition of 31 shares withheld by MasTec to cover taxes on vested restricted stock, all dated 2026-08-14.

Was the MasTec (MTZ) insider transaction a purchase or a sale?

The Form 4 shows a compensation-related award of 139 shares and a tax-withholding disposition of 31 shares. The disposition was not an open-market sale but shares withheld by MasTec to pay taxes on restricted stock vesting.

At what prices were the MasTec (MTZ) insider transactions reported?

The 139-share award to Robert J. Dwyer carried a reported price of $0.00 per share, typical for equity compensation. The 31 shares withheld for taxes were valued at $297.59 per share for tax-settlement purposes.

Did the MasTec (MTZ) insider filing involve a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as an affirmative plan. The reported transactions are described as an equity award and related tax withholding on restricted stock vesting.

What does the tax-withholding transaction mean in the MasTec (MTZ) Form 4?

The Form 4 explains that the 31 disposed shares were withheld by MasTec to pay taxes triggered by restricted stock vesting, so the shares funded tax obligations rather than being sold on the open market.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 04:40 PM Accepted by SEC EDGAR 08/18/2026 - 04:40 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Dwyer Robert J

(Last) (First) (Middle)

622 N. FLAGLER DR.

APT 1103

(Street)

WEST PALM BEACH FLORIDA 33401

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MASTEC INC [ MTZ ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/14/2026		A		139	A	$0	20,991	D
Common Stock	08/14/2026		F		31(1)	D	$297.59	20,960	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

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

Remarks:

	\s\ Alberto de Cardenas For: Robert Dwyer	08/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)