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 |
|---|---|---|---|
| EFFECT | Filing | Sep 3, 2026 | — |
| EFFECT | Filing | Sep 1, 2026 | — |
| EFFECT | Filing | Jul 17, 2025 | — |
| CORRESP | Letter to the SEC | Jul 15, 2025 | — |
| CORRESP | Letter to the SEC | Jul 15, 2025 | — |
| UPLOAD | Letter from the SEC | Jul 1, 2025 | — |
| DRS | Filing | Jun 26, 2025 | — |
| CERT | Nyse american certification | May 5, 2025 | — |
| 8-A12B | Filing | May 5, 2025 | — |
| 8-A12G | Filing | Mar 9, 2022 | — |
| EFFECT | Filing | Mar 22, 2021 | — |
| AW | Filing | Jul 27, 2020 | — |
| EFFECT | Filing | Jul 10, 2020 | — |
| EFFECT | Filing | Jul 10, 2020 | — |
| 25 | Filing | Jun 9, 2020 | — |
| EFFECT | Filing | Apr 23, 2020 | — |
| CORRESP | Letter to the SEC | Apr 21, 2020 | — |
| UPLOAD | Letter from the SEC | Apr 13, 2020 | — |
| EFFECT | Filing | Apr 6, 2020 | — |
| RW | Filing | Apr 3, 2020 | — |
| 425 | 8-k | May 2, 2017 | — |
| 425 | 8-k/a | May 2, 2017 | — |
| 425 | 8-k | May 2, 2017 | — |
| 425 | 8-k/a | May 2, 2017 | — |
| 425 | 8-k | Apr 13, 2017 | — |
| EFFECT | Filing | Apr 12, 2017 | — |
| 425 | 8-k | Apr 12, 2017 | — |
| CORRESP | Letter to the SEC | Apr 11, 2017 | — |
| CORRESP | Letter to the SEC | Mar 24, 2017 | — |
| 425 | 8-k | Mar 24, 2017 | — |
| 425 | 8-k | Mar 24, 2017 | — |
| UPLOAD | Letter from the SEC | Feb 13, 2017 | — |
| CORRESP | Letter to the SEC | Jan 27, 2017 | — |
| UPLOAD | Letter from the SEC | Jan 17, 2017 | — |
| 425 | 8-k | Nov 2, 2016 | — |
| EFFECT | Filing | Jul 18, 2016 | — |
| CORRESP | Letter to the SEC | Jul 14, 2016 | — |
| UPLOAD | Letter from the SEC | Jul 12, 2016 | — |
| D | Filing | May 2, 2016 | — |
| D | Filing | Jan 14, 2016 | — |
| EFFECT | Filing | Sep 30, 2015 | — |
| UPLOAD | Letter from the SEC | Sep 30, 2015 | — |
| CORRESP | Letter to the SEC | Sep 30, 2015 | — |
| CORRESP | Letter to the SEC | Sep 28, 2015 | — |
| CORRESP | Letter to the SEC | Sep 23, 2015 | — |
| UPLOAD | Letter from the SEC | Sep 15, 2015 | — |
| D | Filing | Aug 12, 2015 | — |
| UPLOAD | Letter from the SEC | Jul 16, 2015 | — |
| CORRESP | Letter to the SEC | Jul 13, 2015 | — |
| D | Filing | Feb 18, 2015 | — |
| EFFECT | Filing | Dec 5, 2014 | — |
| CORRESP | Letter to the SEC | Dec 5, 2014 | — |
| CORRESP | Letter to the SEC | Dec 5, 2014 | — |
| CORRESP | Letter to the SEC | Dec 4, 2014 | — |
| UPLOAD | Letter from the SEC | Dec 1, 2014 | — |
| CORRESP | Letter to the SEC | Nov 26, 2014 | — |
| UPLOAD | Letter from the SEC | Nov 4, 2014 | — |
| EFFECT | Filing | Jul 2, 2014 | — |
| CORRESP | Letter to the SEC | Jul 1, 2014 | — |
| CORRESP | Letter to the SEC | Jun 20, 2014 | — |
| UPLOAD | Letter from the SEC | Jun 17, 2014 | — |
| CORRESP | Letter to the SEC | Jun 16, 2014 | — |
| CERTNAS | Auto-generated paper document | May 20, 2014 | — |
| EFFECT | Filing | May 12, 2014 | — |
| 8-A12B | Filing | May 8, 2014 | — |
| CORRESP | Letter to the SEC | May 8, 2014 | — |
| CORRESP | Letter to the SEC | May 8, 2014 | — |
| UPLOAD | Letter from the SEC | Apr 21, 2014 | — |
| UPLOAD | Letter from the SEC | Feb 27, 2014 | — |
| UPLOAD | Letter from the SEC | Feb 27, 2014 | — |
| D | Filing | Oct 31, 2013 | — |
| RW | Form rw | Oct 4, 2013 | — |
| CERTNAS | Auto-generated paper document | Oct 1, 2013 | — |
| EFFECT | Filing | Oct 1, 2013 | — |
| 8-A12B | Filing | Sep 30, 2013 | — |
| CT ORDER | Filing | Jul 2, 2013 | — |
| CT ORDER | Filing | Feb 21, 2013 | — |
| EFFECT | Filing | Feb 14, 2013 | — |
| CORRESP | Letter to the SEC | Feb 14, 2013 | — |
| CORRESP | Letter to the SEC | Feb 14, 2013 | — |
| UPLOAD | Letter from the SEC | Feb 13, 2013 | — |
| CORRESP | Letter to the SEC | Feb 11, 2013 | — |
| CORRESP | Letter to the SEC | Feb 5, 2013 | — |
| UPLOAD | Letter from the SEC | Jan 25, 2013 | — |
| CORRESP | Letter to the SEC | Jan 16, 2013 | — |
| UPLOAD | Letter from the SEC | Jan 4, 2013 | — |
| CORRESP | Letter to the SEC | Dec 21, 2012 | — |
| UPLOAD | Letter from the SEC | Oct 16, 2012 | — |
| UPLOAD | Letter from the SEC | Aug 2, 2012 | — |
| UPLOAD | Letter from the SEC | May 24, 2012 | — |
| UPLOAD | Letter from the SEC | Jan 18, 2012 | — |
Showing 91 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
- 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)
Other Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip companies
- Johnson Controls International plc JCI
- CARRIER GLOBAL Corp CARR
- Lennox International Inc LII
- Aaon, Inc. AAON
- EvoAir Holdings Inc. EVOH
- AirJoule Technologies Corp. AIRJ
- Quest Water Global, Inc. QWTR
- Green Circle Decarbonize Technology Ltd GCDT
All 10 Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.