[Form 4] MASTEC INC Insider Trading Activity

Rhea-AI Filing Summary

MasTec CEO Jose Ramon Mas reported a routine tax-related share disposition. On March 10, 2026, 28,184 shares of MasTec common stock were withheld by the company at an implied value of $297.81 per share to cover taxes due upon vesting of restricted stock.

After this withholding, Mas continues to hold 3,228,064 MasTec shares directly, and additional indirect interests through entities and a family trust, with some of those indirect holdings subject to beneficial ownership disclaimers.

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^*

MAS JOSE RAMON

(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)

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

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		28,184(1)	D	$297.81	3,228,064	D
Common Stock								1,280,688	I	Indirect(2)
Common Stock								425,000	I	Indirect(3)
Common Stock								276,000	I	Indirect(4)

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.

2. Shares owned by Jose Ramon Mas Holdings I, LLC, a Florida limited liability company ("JRM Holdings I"). The sole member of JRM Holdings I is Jose Ramon Mas Holdings, LLC, a Florida limited liability company, of which Jose Mas is the sole member.

3. Shares held by Jose Ramon Mas Irrevocable Family Trust, of which the reporting person's spouse is one of the trustees. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purpose of Section 16 or for any other purpose.

4. Shares owned by Mas Equity Partners III, LLC, a Delaware limited liability company ("MEP III"), in which the reporting person is a member. The reporting person disclaims beneficial ownership of the securities held by MEP III except to the extent of his pecuniary interest therein.

Remarks:

	\s\ Alberto de Cardenas For: Jose Mas	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).
** 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) CEO Jose Ramon Mas report?

MasTec CEO Jose Ramon Mas reported a tax-withholding disposition of 28,184 common shares. The shares were withheld by the company to pay taxes due upon vesting of restricted stock, rather than sold in the open market.

At what price were the MasTec (MTZ) shares withheld for Jose Ramon Mas?

The 28,184 MasTec common shares were withheld at an implied price of $297.81 per share. This amount reflects the value used to satisfy the tax liability arising from the vesting of restricted stock awards.

Does the MasTec (MTZ) CEO still hold a significant stake after the tax withholding?

Yes. After the 28,184-share tax withholding, Jose Ramon Mas directly holds 3,228,064 MasTec shares. He also has additional indirect interests through LLCs and a family trust, with some positions subject to beneficial ownership disclaimers.

Was the MasTec (MTZ) CEO’s Form 4 transaction an open-market sale?

No. The Form 4 describes the event as shares withheld by MasTec to pay taxes on restricted stock vesting. This tax-withholding disposition is different from an open-market sale and does not represent a discretionary stock sale.

What do the indirect MasTec (MTZ) holdings in the Form 4 represent?

The Form 4 lists indirect holdings through entities such as Jose Ramon Mas Holdings I, LLC, a family trust, and Mas Equity Partners III, LLC. Footnotes state that Jose Ramon Mas disclaims beneficial ownership of some of these securities except to the extent of his pecuniary interest.