American Tower (AMT) 8-K American Tower Corporation Announces Completion of

Exhibit 99.1

Contact: Igor Khislavsky

Vice President, Investor Relations

Telephone: (617) 375-7500

AMERICAN TOWER CORPORATION ANNOUNCES COMPLETION OF

REDEMPTION OF ALL OUTSTANDING 5.050% SENIOR NOTES

BOSTON, MASSACHUSETTS- April 22, 2019 - American Tower Corporation (NYSE: AMT) today announced that it has completed its previously announced redemption of all of its outstanding 5.050% senior unsecured notes due 2020. The Company redeemed the notes pursuant to their terms at 103.0050% of the principal amount, plus accrued and unpaid interest up to, but excluding, April 22, 2019. The total aggregate redemption price was approximately $726.0 million, including $5.0 million in accrued interest. The Company financed the redemption with borrowings under its amended and restated credit facility entered into in September 2014, as further amended, and cash on hand. Upon completion of this redemption, none of the 5.050% notes remained outstanding.

About American Tower

American Tower, one of the largest global REITs, is a leading independent owner, operator and developer of multitenant communications real estate with a portfolio of approximately 171,000 communications sites. For more information about American Tower, please visit www.americantower.com.

###