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AMERICAN TOWER CORP /MA/
AMT - CIK 0001053507
Market cap$89.68 B
Rank#171
SEC filings1,012
Market capitalization of AMERICAN TOWER CORP /MA/
As of 2026-06-11, AMERICAN TOWER CORP /MA/ (AMT) has a market capitalization of $89.68 B, making it the #171 most valuable US-listed company.
Recent market cap readings
| Date | Market cap |
|---|---|
| 2026-06-11 | $89.68 B |
| 2026-06-10 | $89.86 B |
| 2026-05-29 | $86.88 B |
| 2026-05-28 | $86.18 B |
| 2026-05-26 | $85.91 B |
| 2026-05-25 | $85.65 B |
| 2026-05-24 | $85.65 B |
| 2026-05-22 | $85.65 B |
Readings accumulate daily as market data refreshes, combining SEC-reported share counts with live prices.
Market Cap of similar companies
Frequently asked questions
What is AMERICAN TOWER CORP /MA/'s market cap?
As of 2026-06-11, AMERICAN TOWER CORP /MA/ (AMT) has a market capitalization of $89.68 B, making it the #171 most valuable US-listed company.
Where does AMERICAN TOWER CORP /MA/ rank by market cap?
AMERICAN TOWER CORP /MA/ is the #171 largest US-listed company by market capitalization.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.