MasTec (NYSE: MTZ) EVP uses share withholding to cover RSU taxes

Rhea-AI Filing Summary

MasTec executive vice president and general counsel Alberto de Cardenas reported a tax-related share disposition. On the vesting of restricted stock, 4,838 shares of common stock were withheld by the company to cover taxes, rather than being sold in the open market.

Following this withholding, he directly holds 96,511 common shares and indirectly holds 8,083.719 shares through a 401(k) plan. The activity reflects routine tax withholding associated with equity compensation, not an active decision to buy or sell shares on the market.

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^*

de Cardenas Alberto

(Last) (First) (Middle)

800 S DOUGLAS ROAD, 12TH FLOOR

(Street)

CORAL GABLES FL 33134

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

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	03/10/2026		F		4,838(1)	D	$297.81	96,511	D
Common Stock								8,083.719	I	By 401(k) Plan

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:

	Alberto de Cardenas	03/12/2026
	** 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).
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FAQ

What insider transaction did MasTec (MTZ) report for Alberto de Cardenas?

MasTec reported that Alberto de Cardenas had 4,838 common shares withheld to pay taxes upon restricted stock vesting. This was a tax-withholding disposition, not an open-market sale, and is a typical administrative step tied to equity compensation.

Was the MasTec (MTZ) insider transaction a market sale of shares?

No, the filing shows shares were withheld for taxes when restricted stock vested. The company retained 4,838 shares to satisfy tax obligations, rather than Alberto de Cardenas selling shares on the open market for cash proceeds.

How many MasTec (MTZ) shares does Alberto de Cardenas hold after the transaction?

After the tax withholding, Alberto de Cardenas directly holds 96,511 common shares. He also has an additional 8,083.719 shares held indirectly through a 401(k) plan, according to the Form 4 insider ownership disclosure.

What does the F code mean in the MasTec (MTZ) Form 4 filing?

The F transaction code indicates a tax-withholding disposition, where shares are surrendered to cover tax liabilities from equity vesting. It is not a discretionary sale, but part of the mechanics of restricted stock or similar awards.

Does the MasTec (MTZ) Form 4 show any open-market buying or selling?

The Form 4 does not report any open-market purchases or sales. It records only 4,838 shares withheld to pay taxes on restricted stock vesting, plus updated direct and 401(k) plan share holdings for Alberto de Cardenas.

How should investors view this MasTec (MTZ) insider tax-withholding event?

This event reflects routine administration of equity compensation, where shares are withheld to satisfy tax obligations. It does not indicate a change in investment sentiment, since no discretionary buy or sell decision in the open market is reported.