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 |
| 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 |
| 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 |
| 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 | — |
| 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 |
| 4 | Insider transaction | Apr 27, 2026 | Apr 24, 2026 |
| DEF 14A | Proxy statement | Apr 21, 2026 | Apr 21, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 8-K |
Current report
Other events
|
Apr 8, 2026 | Apr 8, 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 |
| 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 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 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 |
| 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 |
| 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 | — |
| 4/A | Form 4/a | Jul 14, 2025 | Jun 3, 2025 |
| 4/A | Form 4/a | Jul 14, 2025 | May 27, 2025 |
| UPLOAD | Letter from the SEC | Jul 1, 2025 | — |
| DRS | Filing | Jun 26, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 27, 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 |
| 4 | Insider transaction | May 7, 2025 | May 6, 2025 |
| CERT | Nyse american certification | May 5, 2025 | — |
| 8-A12B | Filing | May 5, 2025 | — |
| 4 | Insider transaction | May 5, 2025 | May 1, 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 | — |
| 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 |
| 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 |
| 4 | Insider transaction | Dec 6, 2024 | Nov 22, 2024 |
| 4 | Insider transaction | Dec 6, 2024 | Oct 9, 2023 |
| 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 |
| 4 | Insider transaction | Sep 27, 2024 | Sep 27, 2024 |
| 4 | Insider transaction | Sep 25, 2024 | Sep 25, 2024 |
| 8-K |
Current report
Material agreement
|
Sep 23, 2024 | Sep 18, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 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 |
| 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 6, 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 |
| 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 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| 8-K |
Current report
Material agreement
|
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 |
| DEF 14A | Proxy statement | 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 |
| PRE 14A | Preliminary proxy statement | 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 |
| 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 |
| 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 |
| 8-K |
Current report
Regulation FD disclosure
|
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 |
| 8-K |
Current report
Officer or director change
|
Dec 14, 2023 | Dec 12, 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 |
| 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 |
| 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 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Oct 10, 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 |
| 8-K |
Current report
Officer or director change
|
Sep 26, 2023 | Sep 22, 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 |
| 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 |
| 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 |
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.