Company facts
- Headquarters
- North Billerica, Massachusetts
- Most recent report
- 8-K, filed Aug 31, 2026
- Incorporated
- Delaware
- Filings on record
- 687 filings
- On EDGAR
- CIK 1537435
- Fiscal year ends
- December
- Filer status
- Non-accelerated filer, Smaller reporting company
Financials 8 of 56
News 8 of 189
Prospectuses and Registrations 8 of 64
- 424B3 Prospectus supplement for an offering Sep 4, 2026
- POS AM Post-effective amendment to a registration Sep 1, 2026
- S-3 Shelf registration statement Aug 31, 2026
- S-1/A Registration statement for an offering, amended Aug 31, 2026
- 424B4 Final prospectus for an offering Jul 21, 2025
- S-1/A Registration statement for an offering, amended Jul 16, 2025
- S-1/A Registration statement for an offering, amended Jul 16, 2025
- S-1/A Registration statement for an offering, amended Jul 16, 2025
Proxies 8 of 19
- DEF 14A Proxy statement for a shareholder vote Apr 21, 2026
- DEF 14A Proxy statement for a shareholder vote Apr 29, 2025
- DEF 14A Proxy statement for a shareholder vote Apr 23, 2024
- PRE 14A Preliminary proxy statement Apr 12, 2024
- DEF 14A Proxy statement for a shareholder vote Apr 25, 2023
- DEF 14A Proxy statement for a shareholder vote Apr 25, 2022
- DEFA14A Extra proxy material Apr 22, 2020
- DEF 14A Proxy statement for a shareholder vote Apr 21, 2020
Ownership 8 of 262
- 4/A Insider reported a trade, amended Sep 8, 2026
- 4/A Insider reported a trade, amended Sep 8, 2026
- 4/A Insider reported a trade, amended Sep 8, 2026
- 4/A Insider reported a trade, amended Sep 8, 2026
- 4/A Insider reported a trade, amended Sep 8, 2026
- 4 Insider reported a trade Jun 30, 2026
- 4 Insider reported a trade Jun 30, 2026
- 4 Insider reported a trade Jun 30, 2026
Other 8 of 97
- EFFECT Notice that a registration became effective Sep 3, 2026
- EFFECT Notice that a registration became effective Sep 1, 2026
- EFFECT Notice that a registration became effective Jul 17, 2025
- S-1MEF Jul 17, 2025
- CORRESP Reply to SEC staff Jul 15, 2025
- CORRESP Reply to SEC staff Jul 15, 2025
- UPLOAD Comment letter from SEC staff Jul 1, 2025
- DRS Draft registration statement, submitted confidentially Jun 26, 2025
Everything here comes from Tecogen Inc.'s own filings on SEC EDGAR. The filing list is rechecked every hour.