Welcome to our dedicated page for Tecogen SEC filings (Ticker: TGEN), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
This page provides access to Tecogen Inc. (TGEN) SEC filings, giving investors a primary source of regulatory information about the company’s operations, financial condition, and capital markets activity. Tecogen is a Delaware corporation with common stock listed on the NYSE American, and it files periodic and current reports with the U.S. Securities and Exchange Commission under this listing.
Through its registration statement on Form S-1 and subsequent filings, Tecogen describes its business as designing, manufacturing, marketing, selling, installing, and maintaining high-efficiency, ultra-clean cogeneration products, including natural gas engine-driven combined heat and power systems, air conditioning systems, and high-efficiency water heaters. Filings also explain its three reportable segments: Products, Services, and Energy Production, which together cover equipment sales, long-term service contracts, and energy sales in the form of electricity, heat, hot water, and cooling.
Key filing types for Tecogen include:
10-K and 10-Q: Annual and quarterly reports that present audited or reviewed financial statements, segment disclosures, risk factors, and management’s discussion of results across Products, Services, and Energy Production. These documents also discuss factors such as demand fluctuations, competing technologies, regulatory changes, incentives and rebates, and financing conditions.
8-K: Current reports used by Tecogen to announce material events, such as quarterly earnings releases and supplemental presentations, underwritten public offerings of common stock, executive appointments, debt prepayments, and Regulation FD disclosures about investor FAQs and presentations on topics like AI data center chillers and hybrid drive technology.
S-1 and related offering documents: Registration statements and prospectuses that describe Tecogen’s capital raises, including the terms of public offerings, use of proceeds for product development, sales and marketing, additional human resources, capital expenditures, and anticipated expansion into the data center market.
On Stock Titan, AI-powered tools can help interpret lengthy Tecogen filings by summarizing complex sections, highlighting segment trends, and surfacing disclosures about items such as non-GAAP measures (for example, Adjusted EBITDA) and risk factors. Users can quickly locate information on TGEN’s reporting segments, capital structure, and material events, while real-time updates from EDGAR ensure that new 10-K, 10-Q, 8-K, S-1, and other filings are captured as they become available.
TECOGEN INC. director Ahmed Ghoniem reported new share ownership through an option exercise and related stock purchase. He completed an open-market purchase of 12,723 shares of common stock at $0.786 per share and exercised stock options for 12,723 shares at the same price. Following these transactions, he holds 12,723 common shares directly and no remaining options from this grant.
Tecogen Inc. is holding its 2026 Annual Meeting of Stockholders on June 5, 2026 at 1:00 p.m. in North Billerica, Massachusetts. Stockholders of record as of April 8, 2026, when 29,905,229 common shares were outstanding, may vote.
They will elect seven directors, ratify Wolf & Company, P.C. as independent auditor, and cast non-binding advisory votes on 2025 executive compensation and on how often to hold future say‑on‑pay votes, with the Board recommending “three years” for frequency. The proxy also details board committees, executive and director pay, ownership of large shareholders and insiders, and equity compensation plans.
TECOGEN INC. director Susan B. Hirsch reported an open-market purchase of 5,000 shares of the company’s Common Stock. The shares were bought at a price of $3.73 per share. After this transaction, she directly owns 265,416 Common Stock shares.
Tecogen Inc. reported that it has extended its Advisory Agreement with Mr. John N. Hatsopoulos. The agreement, originally dated January 18, 2018 and previously amended in 2019 and 2023, will now run through March 31, 2028. The company’s Board of Directors approved the extension by Unanimous Written Consent on April 7, 2026, and the letter agreement documenting this extension is filed as an exhibit.
TECOGEN INC. director Susan B. Hirsch reported an open-market purchase of 10,000 shares of common stock at $2.54 per share. Following this buy, she directly holds 260,416 common shares, increasing her personal stake in the company.
Tecogen Inc. director Earl Lewis reported an open-market purchase of 5,000 shares of Tecogen common stock at an average price of $2.5192 per share. The filing shows that, following this transaction, Lewis directly or through a trust associated with him holds 1,011,006 Tecogen shares.
TECOGEN INC. director Earl Lewis reported an open-market purchase of the company’s common stock through a trust. The trust acquired 5,000 shares at an average price of $2.8817 per share on March 26, 2026. Following this transaction, holdings associated with Lewis total 1,006,006 shares of common stock, indicating a relatively small incremental increase to an already substantial position.
Tecogen Inc. reported that its General Counsel and Secretary, John Kimball Whiting IV, made an open-market purchase of Common Stock. He bought 10,000 shares at $2.38 per share and now directly owns 22,612 shares. This filing highlights an increase in his personal stake in the company.
TECOGEN INC. Chief Accounting Officer Roger P. Deschenes bought additional company stock in the open market. On March 20, 2026, he purchased 10,000 shares of common stock at $2.23 per share. Following this transaction, he directly holds 52,962 shares of Tecogen common stock.
TECOGEN INC. Chief Executive Officer and Chief Financial Officer Rangesh Abinand reported an open-market purchase of 3,000 shares of common stock on 2026-03-20 at a price of $2.298 per share. Following this transaction, his directly reported holdings increased to 67,193 shares of common stock.
According to a footnote, 2,500 of the purchased shares were acquired by Rangesh Abinand and 500 shares were acquired by his daughter, all reported in this Form 4. The transaction is classified as a non-derivative, open-market purchase.