Tecogen Inc. filings document the regulatory record for a Delaware operating company with common stock listed on NYSE American under TGEN. The company's Form 8-K reports furnish earnings releases, supplemental presentation materials, Regulation FD product communications, advisory agreement matters, and other events tied to its clean energy products and chiller applications.
Proxy materials describe board matters, executive compensation, equity awards and shareholder voting items. Other disclosures address related-person transactions, promissory note matters, capital structure, risk factors referenced in periodic reports, and governance controls around company agreements and public communications.
TECOGEN INC. (symbol: TGEN) is the issuer of record for a Form 4/A filing submitted to the SEC. Lafaille Stephen reported acquisition or exercise transactions in this Form 4 filing.
TECOGEN INC. (TGEN) reported that its VP of Business Development, Stephen Lafaille, received a grant of 29,013 shares of Common Stock as a restricted stock award on June 26, 2026 under the Tecogen Inc. 2022 Stock Incentive Plan. The award vests with restrictions lapsing 25% per year, and this amendment corrects his beneficially owned shares to 41,389 following the grant. No Rule 10b5-1 trading plan is reported.
TECOGEN INC. (symbol: TGEN) is the issuer of record for a Form 4/A filing submitted to the SEC. Whiting John Kimball IV reported acquisition or exercise transactions in this Form 4 filing.
TECOGEN INC. (TGEN) reported an amended insider transaction for its General Counsel & Secretary, John Kimball Whiting IV. On June 26, 2026, he received a grant of 19,342 shares of restricted common stock at no cost under the Tecogen Inc. 2022 Stock Incentive Plan, with restrictions lapsing 25% per year. Following this award, his directly held common stock position is reported as 41,954 shares, correcting the previously reported post‑grant balance.
TECOGEN INC. (symbol: TGEN) is the issuer of record for a Form 4/A filing submitted to the SEC. Panora Robert reported acquisition or exercise transactions in this Form 4 filing.
TECOGEN INC. (TGEN) reports that COO and President Robert Panora received a grant of 9,671 shares of common stock on June 26, 2026 as a restricted stock award under the Tecogen Inc. 2022 Stock Incentive Plan, with restrictions lapsing 25% per year. Following this award, his directly held beneficial ownership is 72,194 shares, correcting the previously reported post‑grant amount. No Rule 10b5‑1 trading plan is reported for this transaction.
TECOGEN INC. (symbol: TGEN) is the issuer of record for a Form 4/A filing submitted to the SEC. Deschenes Roger P. reported acquisition or exercise transactions in this Form 4 filing.
TECOGEN INC. (TGEN) reported that Chief Financial Officer Roger P. Deschenes received a grant of 29,013 shares of Common Stock on June 26, 2026 as a Restricted Stock Award under the Tecogen Inc. 2022 Stock Incentive Plan, with restrictions lapsing 25% per year. Following this equity award, Deschenes is reported to beneficially own 81,975 shares of Tecogen common stock. The amendment corrects the number of shares beneficially owned that was previously reported on June 30, 2026, and no Rule 10b5-1 trading plan is reported for this award.
TECOGEN INC. (symbol: TGEN) is the issuer of record for a Form 4/A filing submitted to the SEC. Rangesh Abinand reported acquisition or exercise transactions in this Form 4 filing.
TECOGEN INC. (TGEN) reported that its Chief Executive Officer and director, Rangesh Abinand, received a grant of 174,081 shares of Common Stock as a restricted stock award on June 26, 2026 under the Tecogen Inc. 2022 Stock Incentive Plan, with restrictions lapsing 25% per year. This amended filing corrects the number of shares beneficially owned after the grant to 241,274 shares, and no Rule 10b5-1 trading plan is reported.
Tecogen Inc. (TGEN) has registered up to 4,507,603 shares of common stock for resale by existing selling stockholders under a shelf registration; Tecogen will not receive any proceeds from these sales. There were 30,187,822 shares outstanding as of August 28, 2026, and the stock last traded at $3.11 on NYSE American.
Tecogen develops and services natural-gas-fueled combined heat and power, chiller, and refrigeration systems that improve energy efficiency and reduce greenhouse gas emissions, with three segments: Products, Services, and Energy Production. Growth initiatives target AI data centers and controlled environment agriculture, supported by a 2025 partnership with Vertiv and a 2025 equity raise of 3,985,000 shares at $5.00 per share, yielding $18.1 million in net proceeds for development, data center expansion, debt repayment and working capital.
Key risks highlighted include a history of net losses, dependence on a small set of suppliers and customers, exposure to fuel and power price spreads, a disclosed material weakness in disclosure controls and internal control over financial reporting, regulatory and policy shifts related to fossil fuels, substantial insider ownership with potential influence, and anti-takeover provisions. The company does not expect to pay cash dividends, emphasizing reinvestment of earnings.
Tecogen Inc. (TGEN) is registering up to 4,507,603 shares of common stock on a resale basis for existing selling stockholders under a shelf registration. These stockholders may sell their shares from time to time using various methods, and Tecogen will not receive any proceeds from these sales.
The company develops and sells natural‑gas‑fueled combined heat and power, chiller, and refrigeration systems focused on efficiency, lower emissions and distributed generation, with growth initiatives in AI data centers and controlled environment agriculture. Common stock is listed on the NYSE American under the symbol TGEN; the last reported price on August 28, 2026 was $3.11 per share, and 30,187,822 shares were outstanding as of that date.
Certain large holders affiliated with the Hatsopoulos family have lock‑up agreements restricting sales for 182 days after effectiveness. Tecogen highlights risks including historical net losses, customer and supplier concentration, dependence on natural gas–electricity price spreads, a disclosed material weakness in internal controls, and regulatory and anti‑takeover provisions.