[Form 4] MasTec, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ernst N. Csiszar, a director of MasTec, Inc. (MTZ), reported equity transactions on 08/15/2025. On that date Mr. Csiszar had 254 shares of Common Stock issued to him (reported as acquisition at $0, consistent with shares vesting) and 56 shares were disposed (reported at $178) to satisfy tax withholding. After these transactions he is shown as beneficially owning 23,421 shares. The filing includes an explanatory note that the 56 shares were withheld by the issuer to pay taxes due upon vesting of restricted stock. The Form 4 is signed on behalf of the reporting person on 08/19/2025.

Positive

• Vesting of restricted stock for the director (254 shares acquired) demonstrates alignment with shareholder interests through equity compensation.
• Clear explanatory disclosure that 56 shares were withheld to pay taxes, improving transparency about the nature of the disposition.

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine insider vesting and tax-withholding; not a material governance event.

The filing records the vesting of restricted stock and routine withholding to cover taxes, which is a standard administrative action rather than a change in board composition or governance policy. The director acquired 254 shares at $0 and had 56 shares withheld at a reported value of $178 to satisfy tax obligations, leaving 23,421 shares beneficially owned. This is a common occurrence when equity awards vest and does not by itself indicate a change in control, compensation policy, or related-party transaction requiring further disclosure.

Securities Analyst

TL;DR: Insider reported vesting and tax-withholding; minimal market impact expected.

The transactions are limited in size (254 shares acquired, 56 shares withheld) and are explicitly tied to restricted stock vesting with withholding for taxes. The filing shows the director's post-transaction ownership of 23,421 shares. There are no sales to diversify holdings or large disposals, and no exercised options or cash sales reported that would materially affect float or signal liquidity needs.

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

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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^*

Csiszar Ernst N

(Last) (First) (Middle)

1579 KATHWOOD DR.

(Street)

COLUMBIA SC 29206

(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		254	A	$0	23,477	D
Common Stock	08/15/2025		F		56(1)	D	$178	23,421	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: Ernst Csiszar	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 Ernst N. Csiszar report for MTZ on 08/15/2025?

He reported an acquisition of 254 common shares (vested restricted stock) and a disposition/withholding of 56 shares to pay taxes.

How many MasTec (MTZ) shares does Ernst N. Csiszar beneficially own after the reported transactions?

The Form 4 shows he beneficially owns 23,421 shares following the reported transactions.

Why were 56 shares disposed of according to the filing?

The filing explains that the 56 shares were withheld by the issuer to pay taxes due upon vesting of restricted stock.

At what reported price were the withheld shares recorded?

The withheld/disposed shares are reported with a price of $178 in the transaction table.

Who signed the Form 4 on behalf of Ernst N. Csiszar and when?

The signature block shows Alberto de Cardenas signed for Ernst Csiszar on 08/19/2025.