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 |
|---|---|---|---|
| 4/A | Form 4/a | Sep 8, 2026 | Jun 26, 2026 |
| 4/A | Form 4/a | Sep 8, 2026 | Jun 26, 2026 |
| 4/A | Form 4/a | Sep 8, 2026 | Jun 26, 2026 |
| 4/A | Form 4/a | Sep 8, 2026 | Jun 26, 2026 |
| 4/A | Form 4/a | Sep 8, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 10, 2026 | — |
| 4 | Insider transaction | Apr 27, 2026 | Apr 24, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 27, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 27, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 26, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 23, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 20, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 20, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 20, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4 | Insider transaction | Jul 28, 2025 | Jul 24, 2025 |
| 4/A | Form 4/a | Jul 14, 2025 | Jun 3, 2025 |
| 4/A | Form 4/a | Jul 14, 2025 | May 27, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Mar 3, 2025 |
| 3 | Initial insider ownership | Jun 24, 2025 | Apr 23, 2024 |
| 3 | Initial insider ownership | Jun 24, 2025 | Apr 23, 2024 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 27, 2025 |
| 4 | Insider transaction | May 7, 2025 | May 6, 2025 |
| 4 | Insider transaction | May 5, 2025 | May 1, 2025 |
| 4/A | Form 4/a | Mar 25, 2025 | Nov 22, 2024 |
| 4/A | Form 4/a | Mar 25, 2025 | Oct 9, 2023 |
| 4/A | Form 4/a | Mar 25, 2025 | Jul 15, 2024 |
| 4 | Insider transaction | Dec 6, 2024 | Nov 22, 2024 |
| 4 | Insider transaction | Dec 6, 2024 | Oct 9, 2023 |
| 4 | Insider transaction | Sep 27, 2024 | Sep 27, 2024 |
| 4 | Insider transaction | Sep 25, 2024 | Sep 25, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| 4 | Insider transaction | Jul 17, 2024 | Jul 15, 2024 |
| 4 | Insider transaction | Jul 15, 2024 | Jul 15, 2024 |
| 4 | Insider transaction | Jul 12, 2024 | Jul 10, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 18, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | May 29, 2024 | May 28, 2024 |
| 4 | Insider transaction | May 29, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 28, 2024 | May 22, 2024 |
| 4 | Insider transaction | May 22, 2024 | May 21, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 16, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 24, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 24, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Apr 23, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 16, 2024 |
| 5 | Annual insider ownership | Apr 16, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 15, 2024 |
| 4 | Insider transaction | Apr 12, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 11, 2024 | Apr 11, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 9, 2024 |
| 4 | Insider transaction | Apr 8, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Mar 27, 2024 |
| 4 | Insider transaction | Jan 25, 2024 | Jan 24, 2024 |
| 4 | Insider transaction | Jan 23, 2024 | Jan 23, 2024 |
| 4 | Insider transaction | Jan 23, 2024 | Jan 22, 2024 |
| 4 | Insider transaction | Jan 19, 2024 | Jan 18, 2024 |
| 4 | Insider transaction | Jan 16, 2024 | Jan 16, 2024 |
| 4 | Insider transaction | Dec 28, 2023 | Dec 27, 2023 |
| 4 | Insider transaction | Dec 26, 2023 | Dec 22, 2023 |
| 4 | Insider transaction | Dec 15, 2023 | Dec 14, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 20, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 17, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 14, 2023 |
| 4 | Insider transaction | Oct 20, 2023 | Oct 19, 2023 |
| 4 | Insider transaction | Oct 18, 2023 | Oct 18, 2023 |
| 4 | Insider transaction | Oct 17, 2023 | Oct 17, 2023 |
| 4 | Insider transaction | Oct 13, 2023 | Oct 12, 2023 |
| 4 | Insider transaction | Oct 11, 2023 | Oct 9, 2023 |
| 3 | Initial insider ownership | Oct 2, 2023 | Sep 22, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 29, 2023 |
| 4 | Insider transaction | Sep 28, 2023 | Sep 27, 2023 |
| 4 | Insider transaction | Sep 27, 2023 | Sep 20, 2023 |
| 4 | Insider transaction | Sep 27, 2023 | Sep 20, 2023 |
| 4 | Insider transaction | Sep 27, 2023 | Sep 20, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 19, 2023 |
| 4 | Insider transaction | Sep 11, 2023 | Sep 8, 2023 |
| 4 | Insider transaction | Sep 8, 2023 | Sep 7, 2023 |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 1, 2023 | Aug 15, 2023 |
| 4 | Insider transaction | Aug 23, 2023 | Aug 22, 2023 |
| 4 | Insider transaction | Aug 17, 2023 | Aug 15, 2023 |
| 4 | Insider transaction | Aug 17, 2023 | Aug 14, 2023 |
| 4 | Insider transaction | Jun 27, 2023 | Jun 26, 2023 |
| 4 | Insider transaction | Jun 21, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 20, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 7, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 6, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 5, 2023 | Jun 2, 2023 |
| 4 | Insider transaction | May 26, 2023 | May 26, 2023 |
| 4 | Insider transaction | May 26, 2023 | May 23, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 15, 2023 |
| 4 | Insider transaction | Mar 30, 2023 | Mar 24, 2023 |
| 4 | Insider transaction | Mar 29, 2023 | Mar 28, 2023 |
| 4 | Insider transaction | Mar 27, 2023 | Mar 27, 2023 |
| 4 | Insider transaction | Mar 27, 2023 | Mar 20, 2023 |
| 4 | Insider transaction | Mar 24, 2023 | Mar 24, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 22, 2023 |
| 4 | Insider transaction | Mar 21, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 21, 2023 | Mar 20, 2023 |
| 4 | Insider transaction | Mar 21, 2023 | Mar 20, 2023 |
| 3 | Initial insider ownership | Dec 19, 2022 | Dec 19, 2022 |
| 4 | Insider transaction | Oct 19, 2022 | Oct 19, 2022 |
| 4 | Insider transaction | Oct 18, 2022 | Oct 17, 2022 |
| 4 | Insider transaction | Oct 12, 2022 | Oct 10, 2022 |
| 4 | Insider transaction | Sep 29, 2022 | Sep 28, 2022 |
| 4 | Insider transaction | Sep 12, 2022 | Sep 8, 2022 |
| 4 | Insider transaction | Sep 2, 2022 | Aug 31, 2022 |
| 4 | Insider transaction | Aug 30, 2022 | Aug 26, 2022 |
| 4 | Insider transaction | Aug 25, 2022 | Aug 23, 2022 |
| 4 | Insider transaction | Aug 23, 2022 | Aug 22, 2022 |
| 4 | Insider transaction | Jun 28, 2022 | Jun 23, 2022 |
| 4 | Insider transaction | Jun 28, 2022 | Jun 23, 2022 |
| 4 | Insider transaction | Jun 28, 2022 | Jun 23, 2022 |
| 4 | Insider transaction | Jun 28, 2022 | Jun 23, 2022 |
| 4 | Insider transaction | Jun 28, 2022 | Jun 23, 2022 |
| SC 13G | Ownership over 5% (passive) | May 10, 2022 | — |
| 3/A | Form 3/a | May 6, 2022 | Mar 11, 2022 |
| 3/A | Form 3/a | May 6, 2022 | Mar 16, 2022 |
| 3/A | Form 3/a | May 6, 2022 | Mar 11, 2022 |
| 3/A | Form 3/a | May 6, 2022 | Mar 16, 2022 |
| 3/A | Form 3/a | May 6, 2022 | Mar 11, 2022 |
| 3 | Initial insider ownership | May 6, 2022 | May 4, 2022 |
| 3/A | Form 3/a | Mar 16, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 16, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 16, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 3 | Initial insider ownership | Mar 11, 2022 | Mar 9, 2022 |
| 4 | Insider transaction | Aug 19, 2021 | Aug 17, 2021 |
| 4 | Insider transaction | Aug 20, 2020 | Aug 19, 2020 |
| 4 | Insider transaction | Aug 20, 2020 | Aug 18, 2020 |
| 4 | Insider transaction | Aug 6, 2020 | Jul 9, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 9, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 9, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 9, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 9, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 9, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 15, 2020 |
| 4 | Insider transaction | Jul 21, 2020 | Jul 9, 2020 |
| 3 | Initial insider ownership | Jul 8, 2020 | Jun 5, 2020 |
| 4 | Insider transaction | Jun 9, 2020 | Jun 8, 2020 |
| 4/A | Form 4/a | Jun 4, 2020 | Jun 1, 2020 |
| 4 | Insider transaction | Jun 3, 2020 | Jun 1, 2020 |
| 3 | Initial insider ownership | Jun 3, 2020 | Jun 6, 2019 |
| 4 | Insider transaction | Apr 24, 2020 | Apr 23, 2020 |
| 4 | Insider transaction | Apr 21, 2020 | Apr 21, 2020 |
| 3 | Initial insider ownership | Apr 2, 2020 | Apr 2, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 26, 2019 | — |
| SC 13G | Ownership over 5% (passive) | Aug 1, 2018 | — |
| 4 | Insider transaction | Jun 1, 2018 | May 31, 2018 |
| 4 | Insider transaction | Jun 1, 2018 | Jan 15, 2018 |
| SC 13G | Ownership over 5% (passive) | May 22, 2018 | — |
| SC 13G/A | Amended ownership over 5% (passive) | May 16, 2018 | — |
| 4/A | Form 4/a | Apr 11, 2018 | May 23, 2017 |
| 5 | Annual insider ownership | Feb 12, 2018 | Dec 31, 2017 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2018 | — |
| 5 | Annual insider ownership | Feb 8, 2018 | Dec 31, 2017 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 11, 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.