Tecogen Inc. SEC filings TGEN
Tecogen Inc. has 688 filings in SEC EDGAR's recent list, going back to Dec 22, 2011. Its latest annual report, Form 10-K, was filed on Mar 19, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 13, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 14, 2026 (other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Other events
|
Oct 14, 2026 | Oct 14, 2026 |
| 424B3 | Prospectus | Sep 4, 2026 | — |
| EFFECT | Filing | Sep 3, 2026 | — |
| EFFECT | Filing | Sep 1, 2026 | — |
| POS AM | Filing | Sep 1, 2026 | — |
| S-3 | Shelf registration | Aug 31, 2026 | — |
| 8-K |
Current report
Other events
|
Aug 31, 2026 | Aug 31, 2026 |
| S-1/A | Amended registration statement | Aug 31, 2026 | — |
| 10-Q | Quarterly report | Aug 13, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 12, 2026 | Aug 12, 2026 |
| 8-K |
Current report
Officer or director change
|
Jul 1, 2026 | Jun 26, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 5, 2026 | Jun 5, 2026 |
| 10-Q | Quarterly report | May 13, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 12, 2026 | May 12, 2026 |
| DEF 14A | Proxy statement | Apr 21, 2026 | Apr 21, 2026 |
| 8-K |
Current report
Other events
|
Apr 8, 2026 | Apr 8, 2026 |
| 10-K | Annual report | Mar 19, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 18, 2026 | Mar 17, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 7, 2026 | Jan 6, 2026 |
| 10-Q | Quarterly report | Nov 13, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 12, 2025 | Nov 12, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 17, 2025 | Sep 17, 2025 |
| 8-K |
Current report
Other events
|
Sep 4, 2025 | Sep 2, 2025 |
| 10-Q | Quarterly report | Aug 13, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 12, 2025 | Aug 12, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Jul 28, 2025 | Jul 24, 2025 |
| 8-K |
Current report
Other events
|
Jul 21, 2025 | Jul 21, 2025 |
| 424B4 | Prospectus | Jul 21, 2025 | — |
| 8-K |
Current report
Material agreement, Other events
|
Jul 18, 2025 | Jul 18, 2025 |
| EFFECT | Filing | Jul 17, 2025 | — |
| S-1MEF | Filing | Jul 17, 2025 | — |
| S-1/A | Amended registration statement | Jul 16, 2025 | — |
| S-1/A | Amended registration statement | Jul 16, 2025 | — |
| S-1/A | Amended registration statement | Jul 16, 2025 | — |
| CORRESP | Letter to the SEC | Jul 15, 2025 | — |
| CORRESP | Letter to the SEC | Jul 15, 2025 | — |
| S-1 | Registration statement | Jul 15, 2025 | — |
| UPLOAD | Letter from the SEC | Jul 1, 2025 | — |
| DRS | Filing | Jun 26, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2025 | Jun 10, 2025 |
| 424B3 | Prospectus | May 22, 2025 | — |
| 424B3 | Prospectus | May 22, 2025 | — |
| 10-Q | Quarterly report | May 13, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 12, 2025 | May 12, 2025 |
| CERT | Nyse american certification | May 5, 2025 | — |
| 8-A12B | Filing | May 5, 2025 | — |
| 8-K |
Current report
Material agreement
|
May 2, 2025 | May 1, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
May 1, 2025 | Apr 30, 2025 |
| DEF 14A | Proxy statement | Apr 29, 2025 | Apr 29, 2025 |
| S-8 | Employee stock plan registration | Mar 28, 2025 | — |
| 10-K | Annual report | Mar 18, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 17, 2025 | Mar 17, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 11, 2025 | Feb 14, 2025 |
| 8-K |
Current report
Material agreement
|
Mar 3, 2025 | Feb 28, 2025 |
| 8-K |
Current report
Other events
|
Feb 19, 2025 | Feb 19, 2025 |
| 8-K |
Current report
Other events
|
Jan 17, 2025 | Jan 14, 2025 |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 14, 2024 | Nov 13, 2024 |
| 8-K |
Current report
Material agreement
|
Sep 23, 2024 | Sep 18, 2024 |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 8, 2024 | Aug 8, 2024 |
| 8-K |
Current report
Material agreement
|
Jul 25, 2024 | Jul 23, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 6, 2024 | Jun 6, 2024 |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 9, 2024 | May 9, 2024 |
| 8-K |
Current report
Material agreement
|
May 3, 2024 | May 1, 2024 |
| DEF 14A | Proxy statement | Apr 23, 2024 | Apr 23, 2024 |
| PRE 14A | Preliminary proxy statement | Apr 12, 2024 | Apr 12, 2024 |
| 10-K | Annual report | Mar 25, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 14, 2024 | Mar 14, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 7, 2024 | Mar 1, 2024 |
| 8-K |
Current report
Material agreement
|
Feb 5, 2024 | Feb 1, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 16, 2024 | Jan 16, 2024 |
| 8-K |
Current report
Officer or director change
|
Dec 14, 2023 | Dec 12, 2023 |
| 10-Q | Quarterly report | Nov 9, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 8, 2023 | Nov 8, 2023 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Oct 10, 2023 | Oct 9, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 26, 2023 | Sep 22, 2023 |
| 10-Q | Quarterly report | Aug 10, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 9, 2023 | Aug 9, 2023 |
| 8-K |
Current report
Other events
|
Jul 24, 2023 | Jul 19, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 8, 2023 | Jun 8, 2023 |
| 10-Q | Quarterly report | May 11, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 11, 2023 | May 10, 2023 |
| 8-K |
Current report
Other events
|
May 3, 2023 | May 3, 2023 |
| DEF 14A | Proxy statement | Apr 25, 2023 | Dec 31, 2022 |
| 10-K | Annual report | Mar 23, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Material agreement, Results of operations, Regulation FD disclosure
|
Mar 16, 2023 | Mar 16, 2023 |
| 8-K |
Current report
Officer or director change
|
Jan 30, 2023 | Jan 30, 2023 |
| 8-K |
Current report
Officer or director change
|
Dec 8, 2022 | Dec 8, 2022 |
| 10-Q | Quarterly report | Nov 10, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 10, 2022 | Nov 10, 2022 |
| 8-K |
Current report
Officer or director change
|
Sep 21, 2022 | Sep 19, 2022 |
| 10-Q | Quarterly report | Aug 11, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 11, 2022 | Aug 11, 2022 |
| 8-K |
Current report
Other events
|
Jul 20, 2022 | Jul 20, 2022 |
| 424B3 | Prospectus | Jul 1, 2022 | — |
| S-8 | Employee stock plan registration | Jun 23, 2022 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 15, 2022 | Jun 15, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2022 | Jun 10, 2022 |
| 10-Q | Quarterly report | May 12, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 12, 2022 | May 12, 2022 |
| DEF 14A | Proxy statement | Apr 25, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 22, 2022 | Mar 22, 2022 |
| 10-K | Annual report | Mar 10, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 10, 2022 | Mar 10, 2022 |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 9, 2022 | Mar 8, 2022 |
| 8-A12G | Filing | Mar 9, 2022 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 20, 2022 | Jan 20, 2022 |
| 10-Q | Quarterly report | Nov 10, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 10, 2021 | Nov 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 10, 2021 | Nov 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 12, 2021 | Oct 12, 2021 |
| 8-K |
Current report
Other events
|
Sep 21, 2021 | Sep 21, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 13, 2021 | Sep 13, 2021 |
| 10-Q | Quarterly report | Aug 12, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 12, 2021 | Aug 12, 2021 |
| 8-K |
Current report
Officer or director change
|
Jun 16, 2021 | Jun 16, 2021 |
| 10-Q | Quarterly report | May 13, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 13, 2021 | May 13, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 30, 2021 | Mar 29, 2021 |
| 424B3 | Prospectus | Mar 23, 2021 | — |
| EFFECT | Filing | Mar 22, 2021 | — |
| POS AM | Filing | Mar 19, 2021 | — |
| 10-K | Annual report | Mar 18, 2021 | Dec 31, 2020 |
| POS AM | Filing | Mar 12, 2021 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 11, 2021 | Mar 11, 2021 |
| 8-K |
Current report
Other events
|
Feb 25, 2021 | Feb 25, 2021 |
| 8-K |
Current report
Other events
|
Feb 9, 2021 | Feb 9, 2021 |
| 8-K |
Current report
Other events
|
Jan 20, 2021 | Jan 20, 2021 |
| 10-Q | Quarterly report | Nov 12, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 12, 2020 | Nov 12, 2020 |
| 10-Q | Quarterly report | Aug 13, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 13, 2020 | Aug 13, 2020 |
| S-8 POS | Filing | Jul 28, 2020 | — |
| AW | Filing | Jul 27, 2020 | — |
| POS AM | Filing | Jul 24, 2020 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Jul 21, 2020 | Jul 20, 2020 |
| EFFECT | Filing | Jul 10, 2020 | — |
| EFFECT | Filing | Jul 10, 2020 | — |
| POS AM | Filing | Jul 10, 2020 | — |
| POS AM | Filing | Jul 10, 2020 | — |
| 8-K |
Current report
Other events
|
Jul 8, 2020 | Jul 8, 2020 |
| 25 | Filing | Jun 9, 2020 | — |
| 8-K |
Current report
Other events
|
Jun 9, 2020 | Jun 9, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Jun 5, 2020 | Jun 5, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 4, 2020 | Jun 4, 2020 |
| 8-K |
Current report
Listing notice
|
May 29, 2020 | May 29, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
May 26, 2020 | May 26, 2020 |
| 8-K |
Current report
Officer or director change
|
May 15, 2020 | May 15, 2020 |
| 10-Q | Quarterly report | May 14, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 14, 2020 | May 14, 2020 |
| 8-K |
Current report
Agreement ended
|
May 12, 2020 | May 11, 2020 |
| EFFECT | Filing | Apr 23, 2020 | — |
| DEFA14A | Additional proxy material | Apr 22, 2020 | — |
| CORRESP | Letter to the SEC | Apr 21, 2020 | — |
| DEF 14A | Proxy statement | Apr 21, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Other events
|
Apr 17, 2020 | Apr 17, 2020 |
| 8-K |
Current report
Other events
|
Apr 14, 2020 | Apr 14, 2020 |
| UPLOAD | Letter from the SEC | Apr 13, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 7, 2020 | Apr 7, 2020 |
| EFFECT | Filing | Apr 6, 2020 | — |
| S-3 | Shelf registration | Apr 6, 2020 | — |
| POS AM | Filing | Apr 6, 2020 | — |
| RW | Filing | Apr 3, 2020 | — |
| S-3/A | Filing | Apr 2, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 1, 2020 | Apr 1, 2020 |
| 8-K |
Current report
Other events
|
Mar 18, 2020 | Mar 18, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 17, 2020 | Mar 17, 2020 |
| 10-K | Annual report | Mar 12, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 12, 2020 | Mar 12, 2020 |
| 10-Q | Quarterly report | Nov 12, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 12, 2019 | Nov 12, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 15, 2019 | Oct 15, 2019 |
| 10-Q | Quarterly report | Aug 13, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 13, 2019 | Aug 13, 2019 |
| 8-K |
Current report
Officer or director change
|
Jul 25, 2019 | Jul 22, 2019 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Jul 25, 2019 | Jun 10, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2019 | Jun 10, 2019 |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2019 | Jun 6, 2019 |
| 10-Q | Quarterly report | May 15, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 14, 2019 | May 14, 2019 |
| DEFA14A | Additional proxy material | Apr 24, 2019 | — |
| DEF 14A | Proxy statement | Apr 23, 2019 | Jun 6, 2019 |
| 10-K | Annual report | Mar 29, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 28, 2019 | Mar 28, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 18, 2019 | Mar 18, 2019 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets
|
Mar 8, 2019 | Mar 7, 2019 |
| 8-K |
Current report
Officer or director change
|
Feb 1, 2019 | Feb 1, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 8, 2019 | Jan 7, 2019 |
| 8-K |
Current report
Other events
|
Dec 28, 2018 | Dec 28, 2018 |
| 8-K |
Current report
Material agreement
|
Dec 17, 2018 | Dec 17, 2018 |
| 8-K |
Current report
Other events
|
Nov 19, 2018 | Nov 19, 2018 |
| 10-Q | Quarterly report | Nov 13, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 13, 2018 | Nov 13, 2018 |
| 8-K |
Current report
Other events
|
Sep 18, 2018 | Sep 17, 2018 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 4, 2018 | Sep 4, 2018 |
| 10-Q | Quarterly report | Aug 14, 2018 | Jun 30, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 14, 2018 | Aug 14, 2018 |
| 8-K |
Current report
Shareholder vote results
|
Jun 7, 2018 | Jun 7, 2018 |
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
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (SIC 3585)
- Listed as
- TGEN (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- North Billerica, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1537435
- Former names
- TECOGEN INC (until Mar 27, 2013)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.