AMERICAN TOWER CORP /MA/ (AMT) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-28 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: AMERICAN TOWER CORP /MA/ (AMT) CIK: 0001053507 --- Reporting Owner --- Name: Dowling Ruth T CIK: 0001960785 Role: Officer (EVP, Chief Admin Ofr, GC & Sec) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-04-28 | Code: S (Open market sale) Shares: -556 | Price: $178.48 Total Value: $99,234.88 Shares Owned After: 29,877 | Ownership: D (Direct) Footnotes: [F1] The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. [Transaction #2] Security: Common Stock Date: 2026-04-29 | Code: S (Open market sale) Shares: -416 | Price: $177.54 Total Value: $73,856.64 Shares Owned After: 29,461 | Ownership: D (Direct) Footnotes: [F1] The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. --- Footnotes (Complete Index) --- F1: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. --- Signature --- /s/ /s/ Marina A. Breed, as attorney-in-fact (2026-04-30)