MasTec (NYSE: MTZ) director reports stock grant and tax-withheld shares

Rhea-AI Filing Summary

MasTec director Robert J. Dwyer reported routine equity compensation activity in company common stock. He received a grant of 95 shares at no cost and had 21 shares withheld by MasTec to cover taxes due upon vesting of restricted stock.

Following these compensation-related entries, he directly holds 20,873 shares of MasTec common stock. The filing reflects standard award and tax-withholding mechanics rather than open-market buying or selling.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Dwyer Robert J

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	95	$0.00	--
Tax Withholding	Common Stock	21	$434.77	$9K

Holdings After Transaction: Common Stock — 20,873 shares (Direct, null)

Footnotes (1)

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Key Figures

Tax-withheld shares: 21 shares Grant shares: 95 shares Tax withholding reference price: $434.77 per share +1 more

4 metrics

Tax-withheld shares 21 shares Withheld to pay taxes upon vesting of restricted stock

Grant shares 95 shares Common stock grant/award acquisition

Tax withholding reference price $434.77 per share Value used for 21 shares withheld for taxes

Post-transaction holdings 20,873 shares Common stock directly owned after reported transactions

Key Terms

restricted stock, tax-withholding disposition, Grant, award, or other acquisition, Form 4

4 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.

tax-withholding disposition financial

"transaction_action":"tax-withholding disposition"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Grant, award, or other acquisition financial

"transaction_code_description":"Grant, award, or other acquisition"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

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)
05/15/2026

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	05/15/2026		A		95	A	$0	20,873	D
Common Stock	05/15/2026		F		21(1)	D	$434.77	20,852	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	05/19/2026
	** 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)

FAQ

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

Robert J. Dwyer reported a stock grant and tax withholding. He received 95 shares of MasTec common stock as a grant, and 21 shares were withheld by the company to pay taxes due upon vesting of restricted stock, reflecting routine compensation activity.

Did the MasTec (MTZ) director make any open-market stock purchases or sales?

The reported transactions were not open-market trades. The Form 4 shows a grant of 95 common shares and a disposition of 21 shares withheld for taxes upon vesting of restricted stock, rather than discretionary buying or selling in the open market.

How many MasTec (MTZ) shares does Robert J. Dwyer hold after this Form 4?

After these transactions, Robert J. Dwyer holds 20,873 shares. The Form 4 reports his direct ownership of MasTec common stock at 20,873 shares following the stock grant and associated tax-withholding share disposition on the reported date.

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

The tax-withholding reflects shares used to pay taxes. The filing notes that 21 shares of MasTec common stock were withheld by the issuer to satisfy taxes due when restricted stock vested, which is a standard, non-market mechanism rather than an open-market sale.

Why was Robert J. Dwyer granted 95 MasTec (MTZ) shares at no cost?

The 95-share grant represents equity compensation. The Form 4 describes an acquisition coded as a grant or award of common stock, providing the director with 95 shares at a reported price of $0.00 per share as part of his compensation package.