MasTec (NYSE: MTZ) director Alex Spiro submits SEC Form 3 ownership report

Rhea-AI Filing Summary

A SEC Form 3 for MasTec, Inc. (MTZ) identifies Alex Spiro as a director and reports no insider transactions or derivative positions, with all transaction counts at zero. A remark notes an exhibit titled Limited Power of Attorney associated with this insider ownership report.

Key Figures

Buy transactions reported: 0 transactions Sell transactions reported: 0 transactions Holding entries reported: 0 positions

3 metrics

Buy transactions reported 0 transactions SEC Form 3 transaction summary buyCount

Sell transactions reported 0 transactions SEC Form 3 transaction summary sellCount

Holding entries reported 0 positions SEC Form 3 transactionSummary holdingEntries

Key Terms

Limited Power of Attorney, reporting person, ten percent owner

3 terms

Limited Power of Attorney regulatory

"Remark text: EXHIBIT LIST: LIMITED POWER OF ATTORNEY"

reporting person regulatory

"Data identify Alex Spiro as a reporting person for MasTec, Inc."

ten percent owner regulatory

"Status field is_ten_percent_owner reflects a ten percent owner threshold"

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FAQ

What does the SEC Form 3 for MTZ and Alex Spiro show?

It identifies Alex Spiro as a director of MasTec, Inc. and presents zero insider share transactions or derivative positions. The report serves as a regulatory record of his status as a reporting person with the company under SEC ownership disclosure rules.

What role does Alex Spiro hold at MasTec (MTZ) according to Form 3?

According to the Form 3 data, Alex Spiro is classified as a director of MasTec, Inc. He is not listed as an officer and is not designated as a ten percent owner, so his reportable status arises from his board position.

Does the Alex Spiro Form 3 for MTZ report any insider trades?

No trades are reported. The transaction summary shows 0 buy transactions, 0 sell transactions and 0 derivative transactions, indicating this Form 3 currently serves only to record his reporting-person status, not any recent security transactions.

What is mentioned about a Limited Power of Attorney in the MasTec MTZ Form 3?

The remarks section references an exhibit labeled "EXHIBIT LIST: LIMITED POWER OF ATTORNEY". This indicates that a Limited Power of Attorney document is associated with the insider’s ownership report, typically authorizing others to act on the reporting person’s behalf in SEC matters.

Does the Form 3 show any existing holdings for Alex Spiro in MTZ shares?

The structured data lists holdingEntries at 0, so no specific beneficial holdings or derivative positions are detailed for Alex Spiro in this report. The focus here is on his status as a director rather than on particular equity positions.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Spiro Alex

(Last) (First) (Middle)

6312 RIVIERIA DRIVE

(Street)

CORAL GABLES FLORIDA 33146

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
07/24/2026

3. Issuer Name and Ticker or Trading Symbol
MASTEC INC [ MTZ ]

3a. Foreign Trading Symbol

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

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

EXHIBIT LIST: LIMITED POWER OF ATTORNEY

No securities are beneficially owned.

	\s\ Alberto de Cardenas For: Alex Spiro	08/03/2026
	** 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 5 (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 3: SEC 1473 (03-26)