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AMERICAN TOWER CORP /MA/ Director's Dealing 2011

Mar 14, 2011

29887_dirs_2011-03-14_40d564bc-14e4-44ef-9378-af5745d132f4.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: TAICLET JAMES D JR (Director, Chairman, President and CEO)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2011-03-10 Class A Common Stock M 14605 Acquired 39628 Direct
2011-03-10 Class A Common Stock F 4638 $50.78 Disposed 34990 Direct
2011-03-10 Class A Common Stock M 11889 Acquired 46879 Direct
2011-03-10 Class A Common Stock F 4455 $50.78 Disposed 42424 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 175337 Acquired 2021-03-10 Class A Common Stock (175337) Direct
2011-03-10 Restricted Stock Units $ A 59079 Acquired Class A Common Stock (59079) Direct
2011-03-10 Restricted Stock Units $ M 14605 Disposed Class A Common Stock (14605) Direct
2011-03-10 Restricted Stock Units $ M 11889 Disposed Class A Common Stock (11889) Direct

Holdings (Non-Derivative)

Security Shares Ownership
Class A Common Stock 1000 Indirect

Footnotes

F1: Mr. Taiclet disclaims beneficial ownership in shares owned by minor children.

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.