MasTec (NYSE: MTZ) withholds 34 shares for director taxes

Rhea-AI Filing Summary

MASTEC INC (MTZ) director Ernst N. Csiszar reported equity compensation activity. On 2026-08-14, he received a grant of 152 shares of Common Stock at $0.00 per share. On the same date, 34 shares were disposed of, with the company withholding these shares at $297.59 per share to pay taxes due upon vesting of restricted stock.

Insider Trade Summary

Net Buyer: 118 shares

Net Buy 2 txns

Insider Csiszar Ernst N

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	152	$0.00	$0.00
Tax Withholding	Common Stock F1	34	$297.59	$10K

Holdings After Transaction: Common Stock — 10,934 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

Shares granted: 152 shares Grant price per share: $0.00 per share Shares withheld for taxes: 34 shares +2 more

5 metrics

Shares granted 152 shares Common Stock grant to director on 2026-08-14

Grant price per share $0.00 per share Price for 152-share Common Stock grant

Shares withheld for taxes 34 shares Shares disposed of to pay taxes upon restricted stock vesting

Tax withholding price $297.59 per share Per-share value for 34 shares withheld to pay taxes

ExercisePriceOrTaxLiabilityShares 34 shares Total shares in code F transaction for tax liability payment

Key Terms

restricted stock, withheld by the Issuer, Form 4

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"

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.

FAQ

What insider transactions did MASTEC INC (MTZ) disclose for Ernst N. Csiszar?

Ernst N. Csiszar reported a grant of 152 MTZ common shares on 2026-08-14 and a disposition of 34 shares the same day, which were withheld by MasTec to cover taxes on vested restricted stock.

How many MTZ shares were granted to director Ernst N. Csiszar?

Ernst N. Csiszar received a grant of 152 shares of MasTec common stock on 2026-08-14 at $0.00 per share, reflecting an equity compensation award rather than an open-market purchase.

Why were 34 MASTEC INC (MTZ) shares disposed of in this Form 4?

The 34 MTZ shares disposed of on 2026-08-14 were withheld by MasTec to pay taxes due upon the vesting of restricted stock, rather than being sold on the open market.

What price is associated with the 34 MTZ shares withheld for taxes?

The 34 MasTec shares withheld for taxes were valued at a per-share price of $297.59. This amount was used to satisfy tax obligations upon vesting of the director’s restricted stock award.

Does this MTZ Form 4 involve a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirming plan use, and the structured data show aff_10b5_one: false, indicating the transactions are not reported as made under a 10b5-1 trading plan.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 04:41 PM Accepted by SEC EDGAR 08/18/2026 - 04:41 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^*

Csiszar Ernst N

(Last) (First) (Middle)

1579 KATHWOOD DR.

(Street)

COLUMBIA SOUTH CAROLINA 29206

(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		152	A	$0	10,968	D
Common Stock	08/14/2026		F		34(1)	D	$297.59	10,934	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	08/18/2026
	** 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)