Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
MAS JORGE
   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)
(Last)
(First)
(Middle)
800 DOUGLAS RD, 12TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
03/09/2011
(Street)

CORAL GABLES, FL 33134		 4. If Amendment, Date 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
(City)
(State)
(Zip)
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 03/09/2011   M   50,000 A $ 7.74 50,000 D  
Common Stock 03/09/2011   M   50,000 A $ 10.53 100,000 D  
Common Stock (1) 03/09/2011   S   100,000 D $ 19.8044 (2) 0 D  
Common Stock               8,800,410 I Indirect 1 (3)
Common Stock               9,621,016 I Indirect 2 (4)
Common Stock               282,670 I Indirect 3 (5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities
(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 of Derivative Security: 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
Non-Qualified Stock Option (right to buy) $ 7.74 03/09/2011   M     50,000   (6) 08/14/2013 Common Stock 50,000 $ 0 0 D  
Non-Qualified Stock Option (right to buy) $ 10.53 03/09/2011   M     50,000   (7) 08/23/2015 Common Stock 50,000 $ 0 100,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MAS JORGE
800 DOUGLAS RD
12TH FLOOR
CORAL GABLES, FL 33134		   X   X    

Signatures

 By: s/ Alberto de Cardenas, P of A For: Jorge Mas   03/11/2011
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Pursuant to a 10b5-1 Plan.
(2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.60 to $19.96, inclusive. The reporting person undertakes to provide to MasTec, Inc. ("MasTec"), any security holder of MasTec or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.
(3) 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.
(4) 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.
(5) 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.
(6) The options vested in substantially equal installments on August 14th of 2004, 2005, and 2006.
(7) The options vested on October 11, 2005.

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