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 |
|---|---|---|---|
| 424B3 | Prospectus | Sep 4, 2026 | — |
| POS AM | Filing | Sep 1, 2026 | — |
| S-3 | Shelf registration | Aug 31, 2026 | — |
| S-1/A | Amended registration statement | Aug 31, 2026 | — |
| 424B4 | Prospectus | Jul 21, 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 | — |
| S-1 | Registration statement | Jul 15, 2025 | — |
| 424B3 | Prospectus | May 22, 2025 | — |
| 424B3 | Prospectus | May 22, 2025 | — |
| S-8 | Employee stock plan registration | Mar 28, 2025 | — |
| 424B3 | Prospectus | Jul 1, 2022 | — |
| S-8 | Employee stock plan registration | Jun 23, 2022 | — |
| 424B3 | Prospectus | Mar 23, 2021 | — |
| POS AM | Filing | Mar 19, 2021 | — |
| POS AM | Filing | Mar 12, 2021 | — |
| S-8 POS | Filing | Jul 28, 2020 | — |
| POS AM | Filing | Jul 24, 2020 | — |
| POS AM | Filing | Jul 10, 2020 | — |
| POS AM | Filing | Jul 10, 2020 | — |
| S-3 | Shelf registration | Apr 6, 2020 | — |
| POS AM | Filing | Apr 6, 2020 | — |
| S-3/A | Filing | Apr 2, 2020 | — |
| S-8 | Employee stock plan registration | May 25, 2017 | — |
| 424B3 | Prospectus | Apr 27, 2017 | — |
| S-4/A | S-4/a 3 | Apr 11, 2017 | — |
| S-4/A | S-4/a 2 | Mar 27, 2017 | — |
| S-4/A | Filing | Jan 30, 2017 | — |
| S-4 | Registration for a merger or exchange | Dec 21, 2016 | — |
| S-3 | Shelf registration | Jul 7, 2016 | — |
| 424B3 | Prospectus | Oct 5, 2015 | — |
| S-3/A | Filing | Sep 29, 2015 | — |
| S-3/A | Filing | Sep 23, 2015 | — |
| S-3/A | Filing | Sep 1, 2015 | — |
| S-3 | Shelf registration | Jun 22, 2015 | — |
| 424B3 | Prospectus | Dec 24, 2014 | — |
| S-3/A | Filing | Dec 5, 2014 | — |
| S-3/A | Filing | Nov 26, 2014 | — |
| S-3 | Shelf registration | Oct 28, 2014 | — |
| 424B3 | Prospectus | Oct 8, 2014 | — |
| S-1/A | Amended registration statement | Jun 27, 2014 | — |
| S-1/A | Amended registration statement | Jun 20, 2014 | — |
| S-1/A | Amended registration statement | Jun 16, 2014 | — |
| 424B4 | Prospectus | May 19, 2014 | — |
| S-1/A | Amended registration statement | Apr 23, 2014 | — |
| S-1/A | Amended registration statement | Apr 17, 2014 | — |
| S-1 | Registration statement | Feb 7, 2014 | — |
| S-1 | Registration statement | Feb 6, 2014 | — |
| S-1/A | Amended registration statement | Oct 1, 2013 | — |
| S-1/A | Amended registration statement | Sep 30, 2013 | — |
| S-1/A | Amended registration statement | Sep 3, 2013 | — |
| S-1 | Registration statement | Jun 3, 2013 | — |
| S-8 | Employee stock plan registration | Apr 15, 2013 | — |
| S-1/A | Amended registration statement | Feb 14, 2013 | — |
| S-1/A | Amended registration statement | Feb 11, 2013 | — |
| S-1/A | Amended registration statement | Feb 5, 2013 | — |
| S-1/A | Amended registration statement | Jan 15, 2013 | — |
| S-1/A | Amended registration statement | Dec 21, 2012 | — |
| S-1/A | Amended registration statement | Oct 2, 2012 | — |
| S-1/A | Amended registration statement | Jul 19, 2012 | — |
| S-1/A | Amended registration statement | Apr 27, 2012 | — |
| S-1 | Registration statement | Dec 22, 2011 | — |
Showing 64 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.