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).
1. Name and Address of Reporting Person*
SINGER BRADLEY E

(Last) (First) (Middle)
116 HUNTINGTON AVENUE

(Street)
BOSTON MA 02116

(City) (State) (Zip)
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)
CFO and Treasurer
3. Date of Earliest Transaction (Month/Day/Year)
11/15/2007
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
Class A Common Stock 11/15/2007 M 29,196 A $3.6 34,196 D
Class A Common Stock 11/15/2007 M 50,000 A $5.91 84,196 D
Class A Common Stock 11/15/2007 S(1) 7,800 D $42.8 76,396 D
Class A Common Stock 11/15/2007 S(1) 400 D $42.91 75,996 D
Class A Common Stock 11/15/2007 S(1) 1,800 D $42.94 74,196 D
Class A Common Stock 11/15/2007 S(1) 4,500 D $42.95 69,696 D
Class A Common Stock 11/15/2007 S(1) 2,700 D $42.96 66,996 D
Class A Common Stock 11/15/2007 S(1) 3,100 D $42.97 63,896 D
Class A Common Stock 11/15/2007 S(1) 3,600 D $42.98 60,296 D
Class A Common Stock 11/15/2007 S(1) 2,500 D $42.99 57,796 D
Class A Common Stock 11/15/2007 S(1) 5,600 D $43 52,196 D
Class A Common Stock 11/15/2007 S(1) 2,500 D $43.02 49,696 D
Class A Common Stock 11/15/2007 S(1) 300 D $43.03 49,396 D
Class A Common Stock 11/15/2007 S(1) 2,700 D $43.04 46,696 D
Class A Common Stock 11/15/2007 S(1) 2,700 D $43.05 43,996 D
Class A Common Stock 11/15/2007 S(1) 2,800 D $43.07 41,196 D
Class A Common Stock 11/15/2007 S(1) 2,400 D $43.08 38,796 D
Class A Common Stock 11/15/2007 S(1) 2,300 D $43.09 36,496 D
Class A Common Stock 11/15/2007 S(1) 800 D $43.1 35,696 D
Class A Common Stock 11/15/2007 S(1) 2,990 D $43.12 32,706 D
Class A Common Stock 11/15/2007 S(1) 4,506 D $43.15 28,200 D
Class A Common Stock 11/15/2007 S(1) 2,000 D $43.18 26,200 D
Class A Common Stock 11/15/2007 S(1) 3,500 D $43.2 22,700 D
Class A Common Stock 11/15/2007 S(1) 700 D $43.24 22,000 D
Class A Common Stock 11/15/2007 S(1) 1,500 D $43.26 20,500 D
Class A Common Stock 11/15/2007 S(1) 1,400 D $43.28 19,100 D
Class A Common Stock 11/15/2007 S(1) 1,100 D $43.3 18,000 D
Class A Common Stock 11/15/2007 S(1) 1,400 D $43.31 16,600 D
Class A Common Stock 11/15/2007 S(1) 1,100 D $43.34 15,500 D
Class A Common Stock 11/15/2007 S(1) 900 D $43.36 14,600 D
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
Option to purchase Class A Common Stock $3.6 11/15/2007 M 29,196 (2) 12/09/2012 Class A Common Stock 29,196 $0 0 D
Option to purchase Class A Common Stock $5.91 11/15/2007 M 50,000 (3) 01/18/2012 Class A Common Stock 50,000 $0 0 D
Explanation of Responses:
1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
2. This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning December 9, 2003.
3. This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning January 18, 2003.
Remarks:
This Form 4 is the first of two to be filed to report sales of an aggregate of 79,196 shares of Class A Common Stock on November 15, 2007 by the reporting person. (1 of 2 Forms 4.)
/s/ Nathaniel B. Sisitsky, as attorney-in-fact 11/15/2007
** 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.
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