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).

1. Name and Address of Reporting Person* MAS JORGE (Last) (First) (Middle) 800 DOUGLAS RD 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 X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 09/02/2005
	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	09/02/2005		S		1,300(1)	D	$11.17	136,748	D
Common Stock	09/02/2005		S		1,500(1)	D	$11.18	135,248	D
Common Stock	09/02/2005		S		100(1)	D	$11.21	135,148	D
Common Stock	09/02/2005		S		700(1)	D	$11.22	134,448	D
Common Stock	09/02/2005		S		600(1)	D	$11.24	133,848	D
Common Stock	09/02/2005		S		300(1)	D	$11.26	133,548	D
Common Stock	09/02/2005		S		1,400(1)	D	$11.3	132,148	D
Common Stock	09/02/2005		S		3,600(1)	D	$11.31	128,548	D
Common Stock	09/02/2005		S		100(1)	D	$11.32	128,448	D
Common Stock	09/02/2005		S		100(1)	D	$11.33	128,348	D
Common Stock	09/02/2005		S		200(1)	D	$11.34	128,148	D
Common Stock	09/02/2005		S		400(1)	D	$11.38	127,748	D
Common Stock	09/02/2005		S		600(1)	D	$11.39	127,148	D
Common Stock	09/02/2005		S		25,000(1)	D	$11.4	102,148	D
Common Stock	09/02/2005		S		100(1)	D	$11.41	102,048	D
Common Stock								8,599,361	I	Indirect 1(2)
Common Stock								9,621,016	I	Indirect 2(3)
Common Stock								282,670	I	Indirect 3(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. The shares were sold pursuant to a 10b5 (1) plan.

2. Shares owned of record by Jorge Mas Holdings I Limited Partnership, a Texas limited partnership ("Jorge Mas Holdings"). The sole general partner of Jorge Mas Holdings is Jorge Mas Holdings Corporation, a Texas corporation that is wholly-owned by Mr. Jorge Mas.

3. Shares owned directly by Jorge L. Mas Canosa Holdings I Limited Partnership, a Texas limited partnership, ("the Family Partnership"), and indirectly by Jorge Mas, as the president and sole director of Jorge L. Mas Canosa Holdings Corporation, a Texas corporation, the sole general partner of the Family Partnership. Mr. Jorge Mas disclaims beneficial ownership of the shares held by the Family Partnership except to the extent of his pecuniary interest therein.

4. Shares owned of record by the Mas Family Foundation, Inc., a Florida not-for-profit corporation (the "Family Foundation") of which Mr. Jorge Mas is the president. Mr. Jorge Mas disclaims beneficial ownership of all shares owned by the Family Foundation.

	/s/ Jorge Mas	09/07/2005
	** 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).
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