TECOGEN INC.

Q: Jun 30 2026

Q: Mar 31 2026

FY: Dec 31 2025

Q: Sep 30 2025

Q: Jun 30 2025

Q: Mar 31 2025

FY: Dec 31 2024

Q: Sep 30 2024

Q: Jun 30 2024

Q: Mar 31 2024

FY: Dec 31 2023

Q: Sep 30 2023

Q: Jun 30 2023

Q: Mar 31 2023

FY: Dec 31 2022

Q: Sep 30 2022

Q: Jun 30 2022

Q: Mar 31 2022

FY: Dec 31 2021

Q: Sep 30 2021

Other Events

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Other Events

Results of Operations and Financial Condition

Regulation FD Disclosure

Results of Operations and Financial Condition

Regulation FD Disclosure

Other Events

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Other Events

Entry into a Material Definitive Agreement

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Regulation FD Disclosure

Results of Operations and Financial Condition

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Post-effective amendment to a registration statement

Notice of Effectiveness

Registration statement under Securities Act of 1933

Amended Initial Registration Statement

Prospectus Supplement with Pricing Information

Notice of Effectiveness

No description available

Amended Initial Registration Statement

Amended Initial Registration Statement

Amended Initial Registration Statement

Registration (IPO) statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration of Securities on Exchange

Certification of approval for listing and registration on a national securities exchange

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

No description available

Panora Robert

Whiting John Kimball IV

Rangesh Abinand

Deschenes Roger P.

Lafaille Stephen

Rangesh Abinand

Whiting John Kimball IV

ALBERTINE JOHN M

Panora Robert

Lewis Earl

Ghoniem Ahmed

Galiteva Angelina

Lafaille Stephen

Deschenes Roger P.

Hirsch Susan B

Portolan Capital Management, LLC

Ghoniem Ahmed

Hirsch Susan B

Lewis Earl

Lewis Earl

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Draft registration statement (confidential submission)

Notification of the removal from listing and registration of matured redeemed or retired securities

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC