Exhibit 99.1 Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS (1)(2) Third Quarter 2025 Boston, Massachusetts – October 28, 2025: American Tower Corporation (NYSE: AMT) today reported financial results for the quarter ended September 30, 2025. Steven Vondran, American Tower's Chief Executive Officer, stated, "We delivered another strong quarter, resulting in mid-to-high si ...