On March 14, 2024, Raymond P. Dolan notified the Corporate Secretary of American Tower Corporation of his decision to not stand for re-election at the Company's 2024 Annual Meeting of Stockholders (the Annual Meeting"). Mr. Dolan's decision to not stand for re-election did not involve any disagreements with the Company. Mr. Dolan is currently a member of the Compensation Committee of the Board of Directors of the Company and will continue his service on such committee until the Annual Meeting.

Also on March 14, 2024, Samme L. Thompson notified the Corporate Secretary of the Company of his decision to not stand for re-election at the Annual Meeting. Mr. Thompson's decision to not stand for re-election did not involve any disagreements with the Company. Mr. Thompson is currently a member of the Nominating and Corporate Governance Committee of the Board of the Company and will continue his service on such committee until the Annual Meeting.

On March 14, 2024, the Board elected Neville R. Ray as a director, effective immediately. The Board has not determined committee appointments for Mr. Ray at this time. In accordance with the Company's Amended and Restated By-Laws, Mr. Ray will serve as a director until the Annual Meeting and until his successor is duly elected and qualified.

Mr. Ray most recently served as T-Mobile USA's President of Technology until 2023. Mr. Ray joined T-Mobile USA (then VoiceStream) in April 2000 and from December 2010 to November 2019, served as its Chief Technology Officer. Prior to that, Mr. Ray served as Network Vice President for Pacific Bell Mobile Services.

Mr. Ray currently serves on the board of directors, compensation committee and environmental, social and governance committee of Ziff Davis Inc., a vertically focused digital media and internet company. He also serves on the U.S. President's National Security Telecommunications Advisory Committee (NSTAC). Mr. Ray has served as Chairperson of the Board of Governors of 5G Americas as well as the Vice Chairman of the Cellular Telecommunications Industry Association (CTIA).

In addition, he has served as a member of the National Telecommunications and Information Administration's Commerce Spectrum Management Advisory Committee (CSMAC) and the Federal Communications Commission's Communications Security, Reliability and Interoperability Council (CSRIC).