XFRA:A0T American Tower Corp Insider Activity 4 Filing - 10/1/2012

Effective Date 10/1/2012

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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 *
HESS WILLIAM H
  2. Issuer Name and Ticker or Trading Symbol
AMERICAN TOWER CORP /MA/ [AMT]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, Int'l. Operations
(Last)
(First)
(Middle)
116 HUNTINGTON AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
10/01/2012
(Street)

BOSTON, MA 02116
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 10/01/2012   M   8,125 A $28.39 28,902 D  
Common Stock 10/01/2012   M   1,875 A $37.7 30,777 D  
Common Stock 10/01/2012   S(1)   6,900 D $71.19(2) 23,877 D  
Common Stock 10/01/2012   S(1)   3,100 D $72.02(3) 20,777 D  
Common Stock               5,095 I By GRATs

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
Option to Purchase Common Stock $28.39 10/01/2012   M     8,125   (4) 03/10/2019 Common Stock 8,125 $ 0 25,543 D  
Option to Purchase Common Stock $37.7 10/01/2012   M     1,875   (5) 03/17/2018 Common Stock 1,875 $ 0 20,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
HESS WILLIAM H
116 HUNTINGTON AVENUE
BOSTON, MA 02116
      EVP, Int'l. Operations  

Signatures

 /s/ Mneesha O. Nahata, as attorney-in-fact   10/03/2012
** 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) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
(2) Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $70.73 to $71.68 per share.
(3) Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $71.74 to $72.26 per share.
(4) This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cumulative annual increments beginning March 10, 2010.
(5) This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cumulative annual increments beginning March 17, 2009.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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XFRA:A0T American Tower Corp Insider Activity 4 Filling

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XFRA:A0T American Tower Corp Insider Activity 4 Filing - 10/1/2012
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