X0306 4 2015-03-10 0001053507 AMERICAN TOWER CORP /MA/ AMT 0001411313 Sharma Amit 116 HUNTINGTON AVENUE BOSTON MA 02116 0 1 0 0 EVP, Asia Common Stock 2015-03-10 4 A 0 8063 0 A 97873 D Common Stock 2015-03-10 4 F 0 3123 94.57 D 94750 D Common Stock 2015-03-11 4 F 0 1643 94.63 D 93107 D Option to Purchase Common Stock 94.57 2015-03-10 4 A 0 101061 0 A 2025-03-10 Common Stock 101061 101061 D These Restricted Stock Units (RSUs) were granted pursuant to the 2007 Equity Incentive Plan and vest in 25% cumulative annual increments beginning March 10, 2016. Each RSU respresents a contingent right to receive one share of Common Stock. The issuer's method of reporting RSUs has been revised to report such grants in Table I rather than as previously reported in Table II. Accordingly, amount includes unvested RSUs previously reported in Table II. Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the 2007 Equity Incentive Plan. This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cumulative annual increments beginning March 10, 2016. /s/ Mneesha O. Nahata, as attorney-in-fact 2015-03-12