X0303 4 2009-12-04 0001053507 AMERICAN TOWER CORP /MA/ AMT 0001363889 Meyer Robert Joseph JR 116 HUNTINGTON AVENUE BOSTON MA 02116 0 1 0 0 SVP, Finance & Corp Controller Class A Common Stock 2009-12-04 4 M 0 6250 25.43 A 8432 D Class A Common Stock 2009-12-04 4 S 0 6250 41.76 D 2182 D Class A Common Stock 2009-12-04 4 S 0 1500 41.73 D 682 D Option to Purchase Class A Common Stock 25.43 2009-12-04 4 M 0 6250 0 D 2018-12-01 Class A Common Stock 6250 18750 D Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $41.74 to $41.78 per share. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $41.73 to $41.75 per share. This option was granted pursuant to the 2007 Equity Incentive Plan, and is exercisable in 25% cumulative annual increments beginning December 1, 2009. /s/ Mneesha O. Nahata, as attorney-in-fact 2009-12-08