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 |
|---|---|---|---|
| 8-K |
Current report
Results of operations
|
Oct 27, 2026 | Oct 27, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 18, 2026 | Sep 17, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 14, 2026 | Sep 14, 2026 |
| 8-K |
Current report
Other events
|
Sep 9, 2026 | Sep 9, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2026 | Jul 28, 2026 |
| 8-K |
Current report
Other events
|
Jun 4, 2026 | Jun 2, 2026 |
| 8-K |
Current report
Other events
|
Jun 2, 2026 | Jun 2, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
May 27, 2026 | May 27, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
May 21, 2026 | May 20, 2026 |
| 8-K |
Current report
Other events
|
May 19, 2026 | May 19, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
May 7, 2026 | May 7, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 28, 2026 | Apr 28, 2026 |
| 8-K |
Current report
Officer or director change
|
Mar 10, 2026 | Mar 6, 2026 |
| 8-K |
Current report
Other events
|
Mar 5, 2026 | Mar 5, 2026 |
| 8-K |
Current report
Officer or director change
|
Feb 27, 2026 | Feb 25, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2026 | Feb 24, 2026 |
| 8-K |
Current report
Officer or director change
|
Jan 29, 2026 | Jan 26, 2026 |
| 8-K |
Current report
Other events
|
Jan 28, 2026 | Jan 28, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 5, 2025 | Dec 5, 2025 |
| 8-K |
Current report
Other events
|
Dec 4, 2025 | Dec 4, 2025 |
| 8-K |
Current report
Other events
|
Dec 2, 2025 | Dec 2, 2025 |
| 8-K |
Current report
Officer or director change
|
Nov 7, 2025 | Nov 5, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2025 | Oct 28, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 24, 2025 | Sep 23, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 18, 2025 | Sep 16, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 16, 2025 | Sep 16, 2025 |
| 8-K |
Current report
Other events
|
Sep 11, 2025 | Sep 11, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 5, 2025 | Sep 3, 2025 |
| 8-K |
Current report
Officer or director change
|
Aug 25, 2025 | Aug 22, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2025 | Jul 29, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
May 30, 2025 | May 30, 2025 |
| 8-K |
Current report
Other events
|
May 21, 2025 | May 21, 2025 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 15, 2025 | May 14, 2025 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2025 | Apr 29, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 20, 2025 | Mar 17, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 14, 2025 | Mar 14, 2025 |
| 8-K |
Current report
Other events
|
Mar 11, 2025 | Mar 11, 2025 |
| 8-K |
Current report
Other events
|
Mar 6, 2025 | Mar 6, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 5, 2025 | Feb 27, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2025 | Feb 25, 2025 |
| 8-K |
Current report
Officer or director change
|
Feb 5, 2025 | Feb 5, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Jan 28, 2025 | Jan 28, 2025 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Jan 7, 2025 | Jan 2, 2025 |
| 8-K |
Current report
Other events
|
Dec 5, 2024 | Dec 5, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 21, 2024 | Nov 21, 2024 |
| 8-K |
Current report
Other events
|
Nov 19, 2024 | Nov 18, 2024 |
| 8-K |
Current report
Officer or director change
|
Oct 31, 2024 | Oct 28, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2024 | Oct 29, 2024 |
| 8-K |
Current report
Other events
|
Sep 12, 2024 | Sep 12, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 12, 2024 | Sep 12, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2024 | Jul 30, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
May 29, 2024 | May 29, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
May 24, 2024 | May 22, 2024 |
| 8-K |
Current report
Other events
|
May 22, 2024 | May 22, 2024 |
| 8-K |
Current report
Results of operations
|
Apr 30, 2024 | Apr 30, 2024 |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 14, 2024 | Mar 11, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 7, 2024 | Mar 7, 2024 |
| 8-K |
Current report
Other events
|
Mar 4, 2024 | Mar 4, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2024 | Feb 28, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2024 | Feb 27, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 7, 2024 | Feb 5, 2024 |
| 8-K |
Current report
Other events
|
Jan 5, 2024 | Jan 4, 2024 |
| 8-K |
Current report
Bylaw or fiscal year change, Other events
|
Dec 14, 2023 | Dec 13, 2023 |
| 8-K |
Current report
Results of operations
|
Oct 26, 2023 | Oct 26, 2023 |
| 8-K |
Current report
Other events
|
Sep 20, 2023 | Sep 20, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 15, 2023 | Sep 15, 2023 |
| 8-K |
Current report
Other events
|
Sep 12, 2023 | Sep 12, 2023 |
| 8-K |
Current report
Results of operations
|
Jul 27, 2023 | Jul 27, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 20, 2023 | Jul 20, 2023 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jun 29, 2023 | Jun 27, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
May 25, 2023 | May 25, 2023 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 25, 2023 | May 24, 2023 |
| 8-K |
Current report
Other events
|
May 22, 2023 | May 22, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
May 16, 2023 | May 16, 2023 |
| 8-K |
Current report
Other events
|
May 9, 2023 | May 9, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 26, 2023 | Apr 26, 2023 |
| 8-K |
Current report
Officer or director change
|
Mar 31, 2023 | Mar 28, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 13, 2023 | Mar 13, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 9, 2023 | Mar 8, 2023 |
| 8-K |
Current report
Other events
|
Mar 8, 2023 | Mar 8, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 3, 2023 | Mar 3, 2023 |
| 8-K |
Current report
Officer or director change
|
Mar 2, 2023 | Feb 24, 2023 |
| 8-K |
Current report
Other events
|
Mar 1, 2023 | Feb 28, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 23, 2023 | Feb 23, 2023 |
| 8-K |
Current report
Other events
|
Dec 8, 2022 | Dec 8, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 27, 2022 | Oct 27, 2022 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 3, 2022 | Oct 2, 2022 |
| 8-K |
Current report
Other events
|
Sep 22, 2022 | Sep 22, 2022 |
| 8-K |
Current report
Other events
|
Aug 31, 2022 | Aug 31, 2022 |
| 8-K |
Current report
Agreement ended
|
Aug 11, 2022 | Aug 11, 2022 |
| 8-K |
Current report
Other events
|
Aug 8, 2022 | Aug 8, 2022 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2022 | Jul 28, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 21, 2022 | Jul 21, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jul 11, 2022 | Jul 11, 2022 |
| 8-K |
Current report
Material agreement, Other events
|
Jun 7, 2022 | Jun 2, 2022 |
| 8-K |
Current report
Other events
|
Jun 3, 2022 | Jun 2, 2022 |
| 8-K |
Current report
Other events
|
Jun 2, 2022 | Jun 2, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
May 23, 2022 | May 23, 2022 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
May 19, 2022 | May 18, 2022 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2022 | Apr 27, 2022 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 1, 2022 | Apr 1, 2022 |
| 8-K |
Current report
Other events
|
Mar 29, 2022 | Mar 29, 2022 |
| 8-K |
Current report
Other events
|
Mar 29, 2022 | Mar 29, 2022 |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 11, 2022 | Mar 10, 2022 |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2022 | Feb 24, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2022 | Feb 24, 2022 |
| 8-K |
Current report
Acquisition or sale of assets, Regulation FD disclosure
|
Dec 28, 2021 | Dec 28, 2021 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 16, 2021 | Dec 15, 2021 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Dec 8, 2021 | Dec 8, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure, Other events
|
Nov 15, 2021 | Nov 14, 2021 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2021 | Oct 28, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 25, 2021 | Oct 25, 2021 |
| 8-K |
Current report
Other events
|
Oct 18, 2021 | Oct 18, 2021 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Oct 5, 2021 | Oct 5, 2021 |
| 8-K |
Current report
Other events
|
Sep 29, 2021 | Sep 29, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 27, 2021 | Sep 27, 2021 |
| 8-K |
Current report
Other events
|
Sep 23, 2021 | Sep 23, 2021 |
| 8-K |
Current report
Other events
|
Sep 16, 2021 | Sep 16, 2021 |
| 8-K |
Current report
Other events
|
Sep 14, 2021 | Sep 14, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 16, 2021 | Aug 16, 2021 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2021 | Jul 29, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 16, 2021 | Jun 16, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 3, 2021 | Jun 3, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 1, 2021 | Jun 1, 2021 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 27, 2021 | May 26, 2021 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
May 21, 2021 | May 21, 2021 |
| 8-K |
Current report
Other events
|
May 18, 2021 | May 18, 2021 |
| 8-K |
Current report
Material agreement, Other events
|
May 10, 2021 | May 5, 2021 |
| 8-K |
Current report
Other events
|
May 6, 2021 | May 5, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
May 5, 2021 | May 5, 2021 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2021 | Apr 29, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 29, 2021 | Mar 29, 2021 |
| 8-K |
Current report
Other events
|
Mar 24, 2021 | Mar 24, 2021 |
| 8-K |
Current report
Other events
|
Mar 15, 2021 | Mar 15, 2021 |
| 8-K |
Current report
Other events
|
Mar 11, 2021 | Mar 11, 2021 |
| 8-K |
Current report
Other events
|
Mar 4, 2021 | Mar 4, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 3, 2021 | Feb 25, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2021 | Feb 25, 2021 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Feb 10, 2021 | Feb 5, 2021 |
| 8-K |
Current report
Officer or director change
|
Jan 19, 2021 | Jan 15, 2021 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Jan 13, 2021 | Jan 13, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 23, 2020 | Dec 23, 2020 |
| 8-K |
Current report
Other events
|
Dec 3, 2020 | Dec 3, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 20, 2020 | Nov 20, 2020 |
| 8-K |
Current report
Other events
|
Nov 17, 2020 | Nov 17, 2020 |
| 8-K |
Current report
Officer or director change
|
Nov 6, 2020 | Nov 2, 2020 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Nov 5, 2020 | Nov 4, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2020 | Oct 29, 2020 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Sep 28, 2020 | Sep 28, 2020 |
| 8-K |
Current report
Other events
|
Sep 24, 2020 | Sep 23, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 15, 2020 | Sep 15, 2020 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Sep 10, 2020 | Sep 10, 2020 |
| 8-K |
Current report
Other events
|
Sep 2, 2020 | Sep 2, 2020 |
| 8-K |
Current report
Material agreement
|
Aug 5, 2020 | Aug 5, 2020 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2020 | Jul 30, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 24, 2020 | Jul 24, 2020 |
| 8-K |
Current report
Other events
|
Jul 6, 2020 | Jul 6, 2020 |
| 8-K |
Current report
Other events
|
Jun 4, 2020 | Jun 4, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 3, 2020 | Jun 3, 2020 |
| 8-K |
Current report
Other events
|
Jun 2, 2020 | Jun 1, 2020 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 19, 2020 | May 18, 2020 |
| 8-K |
Current report
Other events
|
May 11, 2020 | May 11, 2020 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2020 | Apr 29, 2020 |
| 8-K/A |
Amended current report
Officer or director change
|
Apr 16, 2020 | Mar 12, 2020 |
| 8-K |
Current report
Other events
|
Apr 9, 2020 | Apr 9, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 3, 2020 | Apr 3, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 16, 2020 | Mar 12, 2020 |
| 8-K |
Current report
Other events
|
Mar 13, 2020 | Mar 12, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 2, 2020 | Feb 25, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2020 | Feb 25, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Feb 13, 2020 | Feb 13, 2020 |
| 8-K |
Current report
Other events
|
Jan 15, 2020 | Jan 15, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Jan 10, 2020 | Jan 10, 2020 |
| 8-K |
Current report
Other events
|
Jan 7, 2020 | Jan 7, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 2, 2020 | Jan 2, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 20, 2019 | Dec 20, 2019 |
| 8-K |
Current report
Other events
|
Dec 16, 2019 | Dec 16, 2019 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 12, 2019 | Dec 11, 2019 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2019 | Oct 31, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 3, 2019 | Oct 3, 2019 |
| 8-K |
Current report
Other events
|
Sep 30, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 16, 2019 | Sep 13, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 3, 2019 | Sep 3, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 6, 2019 | Aug 6, 2019 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2019 | Jul 31, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 26, 2019 | Jul 26, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 13, 2019 | Jun 13, 2019 |
| 8-K |
Current report
Other events
|
Jun 10, 2019 | Jun 10, 2019 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 30, 2019 | May 30, 2019 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 22, 2019 | May 21, 2019 |
| 8-K |
Current report
Officer or director change
|
May 17, 2019 | May 15, 2019 |
| 8-K |
Current report
Results of operations
|
May 3, 2019 | May 3, 2019 |
| 8-K |
Current report
Other events
|
Apr 22, 2019 | Apr 22, 2019 |
| 8-K |
Current report
Other events
|
Mar 21, 2019 | Mar 21, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 15, 2019 | Mar 15, 2019 |
| 8-K |
Current report
Other events
|
Mar 12, 2019 | Mar 12, 2019 |
| 8-K |
Current report
Other events
|
Mar 7, 2019 | Mar 7, 2019 |
| 8-K |
Current report
Officer or director change
|
Mar 4, 2019 | Feb 27, 2019 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2019 | Feb 27, 2019 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Feb 14, 2019 | Feb 14, 2019 |
Showing 200 filings, the most recent 200. 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.
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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
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.