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AMERICAN TOWER CORP /MA/ Director's Dealing 2011

Mar 14, 2011

29887_dirs_2011-03-14_58dba003-627f-45db-9dd6-cd27bee33463.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2011-03-10

Reporting Person: Marshall Steven C. (EVP & President, U.S. Tower)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2011-03-10 Class A Common Stock M 5284 Acquired 9517 Direct
2011-03-10 Class A Common Stock F 1602 $50.78 Disposed 7915 Direct
2011-03-10 Class A Common Stock M 5220 Acquired 13135 Direct
2011-03-10 Class A Common Stock F 1582 $50.78 Disposed 11553 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2011-03-10 Option to Purchase Class A Common Stock $50.78 A 61368 Acquired 2021-03-10 Class A Common Stock (61638) Direct
2011-03-10 Restricted Stock Units $ A 20678 Acquired Class A Common Stock (20678) Direct
2011-03-10 Restricted Stock Units $ M 5284 Disposed Class A Common Stock (5284) Direct
2011-03-10 Restricted Stock Units $ M 5220 Disposed Class A Common Stock (5220) Direct

Footnotes

F1: Includes 600 shares acquired under the Company's employee stock purchase plan in May 2010.

F2: This option was granted pursuant to the 2007 Equity Incentive Plan, and is exercisable in 25% cumulative annual increments beginning March 10, 2012.

F3: Each Restricted Stock Unit (RSU) respresents a contingent right to receive one share of Class A Common Stock.

F4: This RSU was granted pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 10, 2012.

F5: This RSU was granted on March 10, 2009 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 10, 2010. This Form 4 reflects the vesting of this RSU on March 10, 2011 as to 50% of the original grant amount.

F6: This RSU was granted on March 10, 2010 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 10, 2011. This Form 4 reflects the vesting of this RSU on March 10, 2011 as to 25% of the original grant amount.