American Tower Corp /MA/ SEC filings AMT
American Tower Corp /MA/ has 1,001 filings in SEC EDGAR's recent list, going back to May 22, 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 |
|---|---|---|---|
| 424B2 | Prospectus | Sep 10, 2026 | — |
| FWP | Free writing prospectus | Sep 9, 2026 | — |
| 424B5 | Prospectus supplement | Sep 9, 2026 | — |
| S-8 | Employee stock plan registration | May 26, 2026 | — |
| 424B2 | Prospectus | May 20, 2026 | — |
| FWP | Free writing prospectus | May 19, 2026 | — |
| 424B5 | Prospectus supplement | May 19, 2026 | — |
| 424B2 | Prospectus | Dec 3, 2025 | — |
| FWP | Free writing prospectus | Dec 2, 2025 | — |
| 424B5 | Prospectus supplement | Dec 2, 2025 | — |
| 424B2 | Prospectus | Sep 12, 2025 | — |
| FWP | Free writing prospectus | Sep 11, 2025 | — |
| 424B5 | Prospectus supplement | Sep 11, 2025 | — |
| S-3ASR | Automatic shelf registration | Jun 2, 2025 | — |
| 424B2 | Prospectus | May 22, 2025 | — |
| FWP | Free writing prospectus | May 21, 2025 | — |
| 424B5 | Prospectus supplement | May 21, 2025 | — |
| 424B2 | Prospectus | Mar 12, 2025 | — |
| FWP | Free writing prospectus | Mar 11, 2025 | — |
| 424B5 | Prospectus supplement | Mar 11, 2025 | — |
| 424B2 | Prospectus | Nov 19, 2024 | — |
| FWP | Free writing prospectus | Nov 19, 2024 | — |
| 424B5 | Prospectus supplement | Nov 18, 2024 | — |
| 424B2 | Prospectus | May 23, 2024 | — |
| FWP | Free writing prospectus | May 22, 2024 | — |
| 424B5 | Prospectus supplement | May 22, 2024 | — |
| 424B2 | Prospectus | Mar 5, 2024 | — |
| FWP | Free writing prospectus | Mar 4, 2024 | — |
| 424B5 | Prospectus supplement | Mar 4, 2024 | — |
| 424B8 | Filing | Oct 27, 2023 | — |
| 424B2 | Prospectus | Sep 13, 2023 | — |
| FWP | Free writing prospectus | Sep 12, 2023 | — |
| 424B5 | Prospectus supplement | Sep 12, 2023 | — |
| 424B2 | Prospectus | May 23, 2023 | — |
| FWP | Free writing prospectus | May 22, 2023 | — |
| 424B5 | Prospectus supplement | May 22, 2023 | — |
| 424B2 | Prospectus | May 10, 2023 | — |
| FWP | Free writing prospectus | May 9, 2023 | — |
| 424B5 | Prospectus supplement | May 9, 2023 | — |
| 424B2 | Prospectus | Mar 1, 2023 | — |
| FWP | Free writing prospectus | Feb 28, 2023 | — |
| 424B5 | Prospectus supplement | Feb 28, 2023 | — |
| 424B2 | Prospectus | Jun 3, 2022 | — |
| 424B5 | Prospectus supplement | Jun 2, 2022 | — |
| S-3ASR | Automatic shelf registration | Jun 1, 2022 | — |
| 424B2 | Prospectus | Mar 30, 2022 | — |
| FWP | Free writing prospectus | Mar 29, 2022 | — |
| 424B5 | Prospectus supplement | Mar 29, 2022 | — |
| S-8 | Employee stock plan registration | Dec 28, 2021 | — |
| 424B2 | Prospectus | Sep 30, 2021 | — |
| FWP | Free writing prospectus | Sep 29, 2021 | — |
| 424B5 | Prospectus supplement | Sep 29, 2021 | — |
| 424B2 | Prospectus | Sep 24, 2021 | — |
| FWP | Free writing prospectus | Sep 23, 2021 | — |
| 424B5 | Prospectus supplement | Sep 23, 2021 | — |
| 424B2 | Prospectus | May 19, 2021 | — |
| FWP | Free writing prospectus | May 18, 2021 | — |
| 424B5 | Prospectus supplement | May 18, 2021 | — |
| 424B2 | Prospectus | May 6, 2021 | — |
| 424B5 | Prospectus supplement | May 5, 2021 | — |
| 424B2 | Prospectus | Mar 25, 2021 | — |
| FWP | Free writing prospectus | Mar 24, 2021 | — |
| 424B5 | Prospectus supplement | Mar 24, 2021 | — |
| 424B2 | Prospectus | Nov 18, 2020 | — |
| FWP | Free writing prospectus | Nov 17, 2020 | — |
| 424B5 | Prospectus supplement | Nov 17, 2020 | — |
| 424B2 | Prospectus | Sep 24, 2020 | — |
| FWP | Free writing prospectus | Sep 24, 2020 | — |
| 424B5 | Prospectus supplement | Sep 23, 2020 | — |
| 424B2 | Prospectus | Sep 3, 2020 | — |
| FWP | Free writing prospectus | Sep 2, 2020 | — |
| 424B5 | Prospectus supplement | Sep 2, 2020 | — |
| 424B2 | Prospectus | Aug 5, 2020 | — |
| 424B2 | Prospectus | Jun 2, 2020 | — |
| FWP | Free writing prospectus | Jun 1, 2020 | — |
| 424B5 | Prospectus supplement | Jun 1, 2020 | — |
| 424B2 | Prospectus | Jan 8, 2020 | — |
| FWP | Free writing prospectus | Jan 7, 2020 | — |
| 424B5 | Prospectus supplement | Jan 7, 2020 | — |
| 424B2 | Prospectus | Oct 1, 2019 | — |
| FWP | Free writing prospectus | Sep 30, 2019 | — |
| 424B5 | Prospectus supplement | Sep 30, 2019 | — |
| 424B2 | Prospectus | Jun 11, 2019 | — |
| FWP | Free writing prospectus | Jun 10, 2019 | — |
| 424B5 | Prospectus supplement | Jun 10, 2019 | — |
| S-3ASR | Automatic shelf registration | Jun 4, 2019 | — |
| 424B2 | Prospectus | Mar 13, 2019 | — |
| FWP | Free writing prospectus | Mar 12, 2019 | — |
| 424B5 | Prospectus supplement | Mar 12, 2019 | — |
| 424B2 | Prospectus | May 16, 2018 | — |
| FWP | Free writing prospectus | May 15, 2018 | — |
| 424B5 | Prospectus supplement | May 15, 2018 | — |
| 424B2 | Prospectus | Dec 6, 2017 | — |
| FWP | Free writing prospectus | Dec 5, 2017 | — |
| 424B5 | Prospectus supplement | Dec 5, 2017 | — |
| 424B2 | Prospectus | Jun 28, 2017 | — |
| FWP | Free writing prospectus | Jun 27, 2017 | — |
| 424B5 | Prospectus supplement | Jun 27, 2017 | — |
Showing 98 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.