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 |
|---|---|---|---|
| 10-Q | Quarterly report | Oct 27, 2026 | Sep 30, 2026 |
| 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 |
| 424B2 | Prospectus | Sep 10, 2026 | — |
| 8-K |
Current report
Other events
|
Sep 9, 2026 | Sep 9, 2026 |
| FWP | Free writing prospectus | Sep 9, 2026 | — |
| 424B5 | Prospectus supplement | Sep 9, 2026 | — |
| 10-Q | Quarterly report | Jul 28, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2026 | Jul 28, 2026 |
| CERT | Nyse certification | Jun 8, 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-A12B | Filing | May 27, 2026 | — |
| 8-K |
Current report
Material agreement, New debt
|
May 27, 2026 | May 27, 2026 |
| S-8 | Employee stock plan registration | May 26, 2026 | — |
| 25-NSE | Delisting notice | May 22, 2026 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
May 21, 2026 | May 20, 2026 |
| 424B2 | Prospectus | May 20, 2026 | — |
| 8-K |
Current report
Other events
|
May 19, 2026 | May 19, 2026 |
| FWP | Free writing prospectus | May 19, 2026 | — |
| 424B5 | Prospectus supplement | May 19, 2026 | — |
| 8-K |
Current report
Material agreement, New debt
|
May 7, 2026 | May 7, 2026 |
| DEFA14A | Additional proxy material | Apr 28, 2026 | — |
| 10-Q | Quarterly report | Apr 28, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 28, 2026 | Apr 28, 2026 |
| ARS | Annual report to shareholders | Apr 8, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 8, 2026 | — |
| DEF 14A | Proxy statement | Apr 8, 2026 | May 20, 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 |
| 10-K | Annual report | Feb 24, 2026 | Dec 31, 2025 |
| 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 |
| 424B2 | Prospectus | Dec 3, 2025 | — |
| 8-K |
Current report
Other events
|
Dec 2, 2025 | Dec 2, 2025 |
| FWP | Free writing prospectus | Dec 2, 2025 | — |
| 424B5 | Prospectus supplement | Dec 2, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Nov 7, 2025 | Nov 5, 2025 |
| 10-Q | Quarterly report | Oct 28, 2025 | Sep 30, 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 |
| 424B2 | Prospectus | Sep 12, 2025 | — |
| 8-K |
Current report
Other events
|
Sep 11, 2025 | Sep 11, 2025 |
| FWP | Free writing prospectus | Sep 11, 2025 | — |
| 424B5 | Prospectus supplement | 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 |
| 10-Q | Quarterly report | Jul 29, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2025 | Jul 29, 2025 |
| CERT | Nyse certification | Jun 2, 2025 | — |
| S-3ASR | Automatic shelf registration | Jun 2, 2025 | — |
| 8-A12B | Filing | May 30, 2025 | — |
| 8-K |
Current report
Material agreement, New debt
|
May 30, 2025 | May 30, 2025 |
| 424B2 | Prospectus | May 22, 2025 | — |
| 8-K |
Current report
Other events
|
May 21, 2025 | May 21, 2025 |
| FWP | Free writing prospectus | May 21, 2025 | — |
| 424B5 | Prospectus supplement | May 21, 2025 | — |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 15, 2025 | May 14, 2025 |
| 10-Q | Quarterly report | Apr 29, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2025 | Apr 29, 2025 |
| 25-NSE | Delisting notice | Apr 4, 2025 | — |
| ARS | Annual report to shareholders | Apr 2, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 2, 2025 | — |
| DEF 14A | Proxy statement | Apr 2, 2025 | May 14, 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 |
| 424B2 | Prospectus | Mar 12, 2025 | — |
| 8-K |
Current report
Other events
|
Mar 11, 2025 | Mar 11, 2025 |
| FWP | Free writing prospectus | Mar 11, 2025 | — |
| 424B5 | Prospectus supplement | 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 |
| 10-K | Annual report | Feb 25, 2025 | Dec 31, 2024 |
| 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 |
| 424B2 | Prospectus | Nov 19, 2024 | — |
| 8-K |
Current report
Other events
|
Nov 19, 2024 | Nov 18, 2024 |
| FWP | Free writing prospectus | Nov 19, 2024 | — |
| 424B5 | Prospectus supplement | Nov 18, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Oct 31, 2024 | Oct 28, 2024 |
| 10-Q | Quarterly report | Oct 29, 2024 | Sep 30, 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 |
| 10-Q | Quarterly report | Jul 30, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2024 | Jul 30, 2024 |
| CERT | Nyse certification | Jun 3, 2024 | — |
| 8-A12B | Filing | May 29, 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 |
| 424B2 | Prospectus | May 23, 2024 | — |
| 8-K |
Current report
Other events
|
May 22, 2024 | May 22, 2024 |
| FWP | Free writing prospectus | May 22, 2024 | — |
| 424B5 | Prospectus supplement | May 22, 2024 | — |
| 10-Q | Quarterly report | Apr 30, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
Apr 30, 2024 | Apr 30, 2024 |
| PX14A6G | Filing | Apr 17, 2024 | — |
| ARS | Annual report to shareholders | Apr 10, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 10, 2024 | — |
| DEF 14A | Proxy statement | Apr 10, 2024 | May 22, 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 |
| 424B2 | Prospectus | Mar 5, 2024 | — |
| 8-K |
Current report
Other events
|
Mar 4, 2024 | Mar 4, 2024 |
| FWP | Free writing prospectus | Mar 4, 2024 | — |
| 424B5 | Prospectus supplement | Mar 4, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2024 | Feb 28, 2024 |
| 10-K | Annual report | Feb 27, 2024 | Dec 31, 2023 |
| 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 |
| 424B8 | Filing | Oct 27, 2023 | — |
| 10-Q | Quarterly report | Oct 26, 2023 | Sep 30, 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 |
| 424B2 | Prospectus | Sep 13, 2023 | — |
| 8-K |
Current report
Other events
|
Sep 12, 2023 | Sep 12, 2023 |
| FWP | Free writing prospectus | Sep 12, 2023 | — |
| 424B5 | Prospectus supplement | Sep 12, 2023 | — |
| 10-Q | Quarterly report | Jul 27, 2023 | Jun 30, 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 |
| 424B2 | Prospectus | May 23, 2023 | — |
| CERT | Nyse certification | May 23, 2023 | — |
| 8-K |
Current report
Other events
|
May 22, 2023 | May 22, 2023 |
| FWP | Free writing prospectus | May 22, 2023 | — |
| 424B5 | Prospectus supplement | May 22, 2023 | — |
| 8-A12B | Filing | May 16, 2023 | — |
| 8-K |
Current report
Material agreement, New debt
|
May 16, 2023 | May 16, 2023 |
| 424B2 | Prospectus | May 10, 2023 | — |
| 8-K |
Current report
Other events
|
May 9, 2023 | May 9, 2023 |
| FWP | Free writing prospectus | May 9, 2023 | — |
| 424B5 | Prospectus supplement | May 9, 2023 | — |
| 10-Q | Quarterly report | Apr 26, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 26, 2023 | Apr 26, 2023 |
| ARS | Annual report to shareholders | Apr 12, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 12, 2023 | — |
| DEF 14A | Proxy statement | Apr 12, 2023 | — |
| UPLOAD | Letter from the SEC | Apr 7, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Mar 31, 2023 | Mar 28, 2023 |
| CORRESP | Letter to the SEC | Mar 31, 2023 | — |
| CORRESP | Letter to the SEC | 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 |
| UPLOAD | Letter from the SEC | Mar 7, 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 |
| 424B2 | Prospectus | Mar 1, 2023 | — |
| 8-K |
Current report
Other events
|
Mar 1, 2023 | Feb 28, 2023 |
| FWP | Free writing prospectus | Feb 28, 2023 | — |
| 424B5 | Prospectus supplement | Feb 28, 2023 | — |
| 10-K | Annual report | Feb 23, 2023 | Dec 31, 2022 |
| 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 |
| 10-Q | Quarterly report | Oct 27, 2022 | Sep 30, 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 |
| 10-Q | Quarterly report | Jul 28, 2022 | Jun 30, 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 |
| 424B2 | Prospectus | Jun 3, 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 |
| 424B5 | Prospectus supplement | Jun 2, 2022 | — |
| S-3ASR | Automatic shelf registration | Jun 1, 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 |
| 10-Q | Quarterly report | Apr 27, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2022 | Apr 27, 2022 |
| DEFA14A | Additional proxy material | Apr 6, 2022 | — |
| DEF 14A | Proxy statement | Apr 6, 2022 | May 18, 2022 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 1, 2022 | Apr 1, 2022 |
| 424B2 | Prospectus | Mar 30, 2022 | — |
| 8-K |
Current report
Other events
|
Mar 29, 2022 | Mar 29, 2022 |
| FWP | Free writing prospectus | Mar 29, 2022 | — |
| 8-K |
Current report
Other events
|
Mar 29, 2022 | Mar 29, 2022 |
| 424B5 | Prospectus supplement | Mar 29, 2022 | — |
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.
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.