MasTec (MTZ) director sells 6,500 common shares at $300.40

Rhea-AI Filing Summary

MasTec Inc. director Ernst N. Csiszar reported an open-market sale of 6,500 shares of MasTec common stock on March 3, 2026. The shares were sold at a reported price of $300.40 per share, and he held 17,235 shares of common stock directly following the transaction.

Insider Trade Summary

Net Seller: 6,500 shares ($1,952,600)

Net Sell 1 txn

Insider Csiszar Ernst N

Role Director

Sold 6,500 shs ($1.95M)

Type	Security	Shares	Price	Value
Sale	Common Stock	6,500	$300.40	$1.95M

Holdings After Transaction: Common Stock — 17,235 shares (Direct)

Footnotes (1)

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^*

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)
03/03/2026

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	03/03/2026		S		6,500	D	$300.4	17,235	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:

Remarks:

	\s\ Alberto de Cardenas For: Ernst Csiszar	03/05/2026
	** 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.

FAQ

What insider transaction did MasTec (MTZ) report in this Form 4?

MasTec reported that director Ernst N. Csiszar executed an open-market sale of 6,500 shares of MasTec common stock on March 3, 2026, as disclosed in a Form 4 insider trading report filed for the company.

How many MasTec (MTZ) shares did Ernst N. Csiszar sell?

Ernst N. Csiszar sold 6,500 shares of MasTec common stock. The transaction is categorized as a non-derivative, open-market sale of common stock, reported under transaction code S in the Form 4 filing for the company.

At what price were MasTec (MTZ) shares sold in this insider transaction?

The reported sale price was $300.40 per share for the MasTec common stock. This price applies to the 6,500 shares sold in the open-market transaction disclosed for director Ernst N. Csiszar in the Form 4 filing.

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

Following the reported transaction, Ernst N. Csiszar held 17,235 shares of MasTec common stock. The Form 4 indicates these shares are held with direct ownership, reflecting his position after selling 6,500 shares in the open-market transaction.

Was the MasTec (MTZ) insider transaction a buy or a sell?

The transaction was a sale of MasTec common stock. The Form 4 classifies it as an open-market sale under transaction code S, with 6,500 shares sold by director Ernst N. Csiszar at a reported price of $300.40 per share.

What type of security was involved in Ernst N. Csiszar’s MasTec transaction?

The security involved was MasTec Common Stock, reported as a non-derivative security in the Form 4. The filing shows an open-market sale of 6,500 common shares at a reported price of $300.40 per share by director Ernst N. Csiszar.