[Form 4] MasTec, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Robert J. Dwyer, a director of MasTec, Inc. (MTZ), reported two transactions on 08/15/2025. He received 232 shares of MasTec common stock at $0 (likely vesting of restricted shares) bringing his beneficial ownership to 20,543 shares. On the same date 52 shares were disposed of at $178 per share, and the filing explains those 52 shares were withheld by the issuer to cover taxes due upon vesting, reducing his holdings to 20,491 shares. The Form 4 was signed on behalf of Mr. Dwyer on 08/19/2025.

Insights

Corporate Governance Expert

TL;DR: Routine equity vesting and tax-withholding by a director; not a material governance change.

The filing shows standard corporate practice where restricted stock vested and the company withheld shares to satisfy tax withholding obligations. The director's overall stake changed only modestly (20,543 to 20,491 shares), indicating no strategic shift in ownership or control. This type of transaction is common after vesting events and does not, by itself, signal governance concerns or a change in board alignment.

Securities Analyst

TL;DR: Small-scale insider activity: receipt of vested shares and withholding for taxes; immaterial to company valuation.

The report records the acquisition of 232 shares at $0 and the disposition of 52 shares withheld to cover taxes at $178 per share. The net change in beneficial ownership is minor relative to typical institutional holdings. There is no indication of open-market selling or material insider redistribution that would affect investor expectations.

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

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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 FL 33401

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025

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

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

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

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	08/15/2025		A		232	A	$0	20,543	D
Common Stock	08/15/2025		F		52(1)	D	$178	20,491	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	08/19/2025
	** 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.

FAQ

What transactions did Robert J. Dwyer report on Form 4 for MTZ?

On 08/15/2025 Mr. Dwyer reported acquiring 232 shares at $0 and disposing of 52 shares at $178 per share (withheld for taxes).

How many MasTec (MTZ) shares does Robert Dwyer beneficially own after the transactions?

Following the reported transactions his beneficial ownership was 20,491 shares.

Why were 52 shares disposed of in the Form 4 filing?

The filing explains those 52 shares were withheld by the issuer to pay taxes due upon vesting of restricted stock.

When were the reported transactions executed and when was the Form 4 signed?

Transactions occurred on 08/15/2025 and the Form 4 was signed on behalf of Mr. Dwyer on 08/19/2025.

What is Robert Dwyer’s role at MasTec?

The Form 4 identifies Robert J. Dwyer as a Director of MasTec, Inc.