X0508 4 2026-01-02 1 0001053507 AMERICAN TOWER CORP /MA/ AMT 0001754833 Puech Olivier 222 BERKELEY STREET BOSTON MA 02116 0 0 0 1 Former Officer 0 Common Stock 38144 D Includes 109 and 12 shares acquired under the issuer's employee stock purchase plan in May 2025 and in November 2025, respectively. Mr. Puech ceased to be an officer of the issuer effective January 2, 2026. /s/ Marina A. Breed, as attorney-in-fact 2026-01-06