AMT: Other company developments

Item 8.01 Other Events. On September 9, 2026, American Tower Corporation (the “Company”) issued a press release (the “Press Release”) announcing that it had priced its registered public offering of senior unsecured notes due 2031 (the “2031 notes”) in an aggregate principal amount of $500.0 million, senior unsecured notes due 2033 (the “2033 notes”) in an aggregate principal amount of $500.0 million and senior unsecured notes due 2036 (the “2036 notes”) in an aggregate principal amount of $600.0 million. The 2031 notes will have an interest rate of 5.300% per annum and are being issued at a price equal to 99.718% of their face value. The 2033 notes will have an interest rate of 5.560% per annum and are being issued at a price equal to 99.776% of their face value. The 2036 notes will have an interest rate of 5.750% per annum and are being issued at a price equal to 99.497% of their face value. A copy of the Press Release is filed herewith as Exhibit 99.1 and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description 99.1 Press Release, dated September 9, 2026 . 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. AMERICAN TOWER CORPORATION (Registrant) Date: September 9, 2026 By: /s/ Rodney M. Smith Rodney M. Smith Executive Vice President, Chief Financial Officer and Treasurer