American Tower Corp /MA/ SEC filings AMT
American Tower Corp /MA/ has 1,000 filings in SEC EDGAR's recent list, going back to May 31, 2017. Its latest annual report, Form ARS, was filed on Apr 8, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 27, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 27, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| DEFA14A | Additional proxy material | Apr 28, 2026 | — |
| DEFA14A | Additional proxy material | Apr 8, 2026 | — |
| DEF 14A | Proxy statement | Apr 8, 2026 | May 20, 2026 |
| DEFA14A | Additional proxy material | Apr 2, 2025 | — |
| DEF 14A | Proxy statement | Apr 2, 2025 | May 14, 2025 |
| DEFA14A | Additional proxy material | Apr 10, 2024 | — |
| DEF 14A | Proxy statement | Apr 10, 2024 | May 22, 2024 |
| DEFA14A | Additional proxy material | Apr 12, 2023 | — |
| DEF 14A | Proxy statement | Apr 12, 2023 | — |
| DEFA14A | Additional proxy material | Apr 6, 2022 | — |
| DEF 14A | Proxy statement | Apr 6, 2022 | May 18, 2022 |
| DEFA14A | Additional proxy material | Apr 14, 2021 | — |
| DEF 14A | Proxy statement | Apr 14, 2021 | May 26, 2021 |
| DEFA14A | Additional proxy material | Apr 6, 2020 | — |
| DEF 14A | Proxy statement | Apr 6, 2020 | May 18, 2020 |
| DEFA14A | Additional proxy material | Apr 10, 2019 | — |
| DEF 14A | Proxy statement | Apr 10, 2019 | May 21, 2019 |
| DEFA14A | Additional proxy material | Apr 12, 2018 | — |
| DEF 14A | Proxy statement | Apr 12, 2018 | May 23, 2018 |
Showing 19 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Real Estate Investment Trusts (SIC 6798)
- Listed as
- AMT (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Boston, MA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1053507
- Former names
- AMERICAN TOWER SYSTEMS CORP (until May 8, 1998)
Other Real Estate Investment Trusts companies
- Welltower Inc. WELL
- Prologis, Inc. PLD
- Equinix Inc EQIX
- Simon Property Group Inc. SPG
- Digital Realty Trust, Inc. DLR
- Public Storage PSA
- Realty Income Corp O
- Vivmark Residential VMRK
Source: SEC EDGAR filings. This is company-reported data, not investment advice.