Market capitalization is the total value the stock market puts on a company: its share price multiplied by the number of shares outstanding. Each point here is the share count reported in a filing multiplied by the closing price on that filing date, adjusted for later stock splits, so the history moves when a new filing arrives rather than with each day's trading. A larger market cap means investors collectively value the company more highly; by itself it says nothing about profit or debt. Annual points keep the latest observation in each calendar year.
AMERICAN TOWER CORP /MA/ market cap for the quarter ending 2026-07-21 was $76.13B, a 30.04% decline year-over-year.
AMERICAN TOWER CORP /MA/ market cap for the quarter ending 2026-06-30 was $76.2B, a 26.39% decline year-over-year.
AMERICAN TOWER CORP /MA/ market cap for the quarter ending 2026-04-21 was $81.38B, a 21.33% decline year-over-year.
AMERICAN TOWER CORP /MA/ market cap for the quarter ending 2026-03-31 was $80.42B, a 21.06% decline year-over-year.
AMERICAN TOWER CORP /MA/ market cap for fiscal 2026 was $76.13B.
AMERICAN TOWER CORP /MA/ market cap for fiscal 2025 was $81.87B, a 4.50% decline from fiscal 2024.
AMERICAN TOWER CORP /MA/ market cap for fiscal 2024 was $85.72B, a 14.84% decline from fiscal 2023.
AMERICAN TOWER CORP /MA/ market cap for fiscal 2023 was $100.66B, a 2.05% increase from fiscal 2022.