AMERICAN TOWER CORP /MA/ — Director's Dealing 2012

Dec 4, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2012-11-30

Reporting Person: Meyer Robert Joseph JR (SVP, Finance & Corp Controller)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-11-30	Common Stock	S	4606	$75.00	Disposed	4181	Direct
2012-12-01	Common Stock	M	2232	—	Acquired	6413	Direct
2012-12-01	Common stock	F	709	$74.93	Disposed	5704	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-12-01	Restricted Stock Units	$	M	2232	Disposed		Common Stock (2232)	Direct

Footnotes

F1: Includes 427 shares acquired under the Company's employee stock purchase plan in May 2012. Also includes 27 shares acquired under a dividend reinvestment plan not previously required to be reported pursuant to Section 16(a) of the Securities Exchange Act of 1934 (the "Exchange Act"). The transactions reported herein resulted in a short swing profit under Section 16(b) of the Exchange Act. The reporting person has made arrangements with the Company to disgorge such profit promptly upon settlement of the sale.

F2: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of common stock.

F3: This RSU was granted on December 1, 2008 pursuant to the 2007 Equity Incentive Plan and vests in 25% cumulative annual increments beginning December 1, 2009. This Form 4 reflects the vesting of this RSU on December 1, 2012 as to 100% of the original grant amount.