AMERICAN TOWER CORP /MA/ — Director's Dealing 2018

Mar 1, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2018-02-27

Reporting Person: TAICLET JAMES D JR (Director, Chairman, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-02-27	Common Stock	A	15860	—	Acquired	182232	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1420	Indirect
Common Stock	164152	Indirect

Footnotes

F1: Reflects the number of performance stock units ("PSUs") earned, as a result of the Compensation Committee's certification to the achievement of performance, under the terms of a PSU award granted on March 10, 2015. These shares will vest at the end of the three-year performance period, and each PSU represents a contingent right to receive one share of Common Stock.

F2: 13,211 shares were returned to the reporting person's direct beneficial ownership on December 20, 2017, in the form of scheduled annuity payments under the terms of a grantor retained annuity trust formed in 2013 ("2013 GRAT").

F3: 117,546 shares were previously reported as directly beneficially owned. These shares were contributed to a grantor retained annuity trust formed in 2017 ("2017 GRAT") on May 5, 2017.

F4: The reporting person disclaims beneficial ownership in shares held by children.

F5: Includes 46,606 shares held in 2013 GRAT and 117,546 shares held in 2017 GRAT.