AMT · CIK 0001053507
AMERICAN TOWER CORP /MA/ (AMT) SEC Filings
Browse 2584 SEC filings for AMERICAN TOWER CORP /MA/, covering Feb 10, 1998 through Jun 8, 2026, organized by filing purpose with direct links to the original EDGAR documents.
Indexed filings
2,584
Filed in the last 12 months
98
History covered
1998–2026
Latest filing
CERT
Latest important filings
Jump directly to the most recent annual, quarterly, and current reports.
Latest annual report
10-K
Annual report · Feb 24, 2026
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10-Q
Quarterly report · Apr 28, 2026
Open original filingLatest company update
8-K
Other material event · Jun 4, 2026
Open original filingComplete filing history
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50 filings
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| Form | Description | Period ended | Filed |
|---|---|---|---|
| CERT | NYSE CERTIFICATION | — | Jun 8, 2026 |
| 8-K | Other material event | Jun 2, 2026 | Jun 4, 2026 |
| 4 | Change in insider ownership | Jun 1, 2026 | Jun 3, 2026 |
| 8-K | Other material event | Jun 2, 2026 | Jun 2, 2026 |
| 4 | Change in insider ownership | May 28, 2026 | Jun 1, 2026 |
| 8-A12B | 8-A12B filing | — | May 27, 2026 |
| 8-K | Material agreement; Financial obligation | May 27, 2026 | May 27, 2026 |
| S-8 | Employee securities registration statement | — | May 26, 2026 |
| 25-NSE | Exchange delisting notification | — | May 22, 2026 |
| 8-K | Management or director change; Shareholder vote; Other material event | May 20, 2026 | May 21, 2026 |
| 424B2 | 424B2 filing | — | May 20, 2026 |
| 4 | Change in insider ownership | May 20, 2026 | May 20, 2026 |
| 8-K | Other material event | May 19, 2026 | May 19, 2026 |
| FWP | FWP filing | — | May 19, 2026 |
| 424B5 | 424B5 filing | — | May 19, 2026 |
| 8-K | Material agreement; Financial obligation | May 7, 2026 | May 7, 2026 |
| 4 | Change in insider ownership | Apr 28, 2026 | Apr 30, 2026 |
| 3 | Initial insider ownership statement | Apr 27, 2026 | Apr 30, 2026 |
| SCHEDULE 13G | SCHEDULE 13G filing | — | Apr 29, 2026 |
| DEFA14A | Additional proxy materials | — | Apr 28, 2026 |
| 10-Q | Quarterly report | Mar 31, 2026 | Apr 28, 2026 |
| SCHEDULE 13G | SCHEDULE 13G filing | — | Apr 28, 2026 |
| 8-K | Results of operations | Apr 28, 2026 | Apr 28, 2026 |
| ARS | ARS filing | Dec 31, 2025 | Apr 8, 2026 |
| DEFA14A | Additional proxy materials | — | Apr 8, 2026 |
Page 1 of 2
Recent filing activity
Annual filing counts derived from this company's SEC history.
2026
69 filings
2025
99 filings
2024
106 filings
2023
104 filings
2022
91 filings
2021
135 filings
2020
129 filings
2019
120 filings
Sources and methodology
How this filing index is assembled and checked.
Filing metadata comes from SEC EDGAR submissions. Categories and plain-language labels are generated deterministically from SEC form and item codes; filing content is not summarized on this page.
Index updated: 7/15/2026
For research and education only. Always review the original SEC filing before making a decision.