PROSPECTUS SUPPLEMENT SUMMARY
This summary may not contain all the information that may
be important to you. You should read this entire prospectus supplement, the accompanying prospectus and those documents incorporated by reference into the prospectus supplement and the accompanying prospectus, including the risk factors and the
financial statements and related notes, before making an investment decision. Unless otherwise indicated or the context otherwise requires, references to we, us, our and American Tower are references
to American Tower Corporation and its predecessor, as applicable, and its consolidated subsidiaries, in each case, as the context requires. References herein to our common stock refer to our common stock and the Class A common stock of
our predecessor, as applicable.
American Tower Corporation
was created as a subsidiary of American Radio Systems Corporation in 1995 to own, manage, develop and lease communications and broadcast tower sites, and was spun off into a free-standing public company in 1998. Since inception, we have grown our
communications real estate portfolio through acquisitions, long-term lease arrangements, development and construction, and through mergers with, and acquisitions of, other tower operators, increasing the size of our global portfolio to approximately
149,000 communications sites.
Corporation operates as a REIT for U.S. federal income tax purposes.
American Tower Corporation is a holding company, and we conduct our operations through our directly and indirectly owned subsidiaries and our joint ventures. Our principal domestic operating subsidiaries
are American Towers LLC and SpectraSite Communications, LLC. We conduct our international operations primarily through our subsidiary, American Tower International, Inc., which in turn conducts operations through its various international operating
subsidiaries and joint ventures. Our international operations consist primarily of our operations in Argentina, Brazil, Chile, Colombia, Costa Rica, France, Germany, Ghana, India, Mexico, Nigeria, Paraguay, Peru, South Africa and Uganda.
Our principal executive office is located at 116 Huntington Avenue, Boston, Massachusetts 02116. Our main telephone number at that address
is (617) 375-7500.