X0609 4 2023-04-28 0 0001053507 AMERICAN TOWER CORP /MA/ AMT 0001875332 Clarke Teresa Hillary false 222 BERKELEY STREET BOSTON MA 02116 1 0 0 0 0 Common Stock 2023-04-28 4 P 0 6.674 205.93 A 5313.674 D Common Stock 2023-07-10 4 P 0 7.192 193.78 A 5320.866 D Common Stock 2023-10-27 4 P 0 8.452 171.52 A 5329.318 D Common Stock 2024-02-01 4 P 0 7.68 199.95 A 5336.998 D Common Stock 2024-04-26 4 P 0 18.588 172.82 A 5355.586 D Common Stock 2024-07-12 4 P 0 15.873 204.28 A 5371.459 D Common Stock 2024-10-25 4 P 0 14.371 227.42 A 5385.83 D Common Stock 2025-02-03 4 P 0 17.577 187.27 A 5403.407 D Common Stock 2025-04-28 4 P 0 25.488 209.33 A 5428.895 D Common Stock 2025-07-11 4 P 0 24.095 223.23 A 5452.99 D Common Stock 2025-10-20 4 P 0 28.657 189.12 A 5481.647 D Common Stock 2026-02-02 4 P 0 30.713 178.04 A 5512.36 D Common Stock 2026-04-28 4 P 0 43.5 177.08 A 5555.86 D Common Stock 2026-07-13 4 P 0 46.448 167.52 A 5602.308 D Common Stock 2026-10-20 4 P 0 42.926 183.20 A 5645.234 D Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. /s/ Marina A. Breed, as attorney-in-fact 2026-10-22