AMT: Other company developments

Item 8.01 Other Events. On May 19, 2026, American Tower Corporation issued a press release (the “Press Release”) announcing that it had priced its registered public offering of senior unsecured notes due 2033 (the “2033 notes”) in an aggregate principal amount of 750.0 million euros. The 2033 notes will have an interest rate of 4.000% per annum and are being issued at a price equal to 99.663% 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 May 19, 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: May 19, 2026 By: /s/ Rodney M. Smith Rodney M. Smith Executive Vice President, Chief Financial Officer and Treasurer