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 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.
TECOGEN INC. director John Hatsopoulos exercised stock options to acquire 50,000 shares of Common Stock at $0.88 per share under a Stock Option Agreement dated September 20, 2023. Following the exercise, he directly owns 1,038,951 shares of Tecogen Common Stock, indicating an exercise-and-hold transaction with no same-day share sale disclosed.
Tecogen Inc. reports another year of losses but a much stronger balance sheet as it pivots toward data center opportunities. For 2025, the company posted a net loss of about $8.25 million, bringing its accumulated deficit to $55.9 million, and used $9.9 million of cash in operations.
Cash and cash equivalents rose to $12.4 million with working capital of $19.6 million, helped by a July 2025 equity offering of 3,985,000 shares at $5.00 per share that generated roughly $18.1 million in net proceeds. Related‑party promissory notes used to fund relocation and product development were fully repaid or converted to stock.
Tecogen’s three segments—Products, Services and Energy Production—sell natural‑gas‑fueled CHP and chiller systems plus long‑term service and energy contracts. Management highlights AI data centers as a major growth focus, supported by a February 2025 global sales and marketing agreement with Vertiv and a May 2025 uplisting of its common stock to the NYSE American. The filing also emphasizes risks from continued losses, supplier dependence, customer concentration, regulatory changes and evolving sentiment toward fossil fuels.
Tecogen Inc. reported full-year 2025 revenue of $27.07 million, up 19.7% from 2024, but its net loss widened to $8.25 million from $4.76 million. Fourth-quarter 2025 revenue was $5.32 million with a net loss of $3.99 million, reflecting higher costs and asset impairments.
Product revenue more than doubled to $9.13 million, while services grew modestly and energy production declined. Gross profit held roughly flat at $9.82 million, but gross margin fell to 36.3% as service and energy production margins compressed. Operating expenses rose 25.4%, including $1.11 million of goodwill and long-lived asset impairments.
Adjusted EBITDA loss deepened to $5.64 million from $3.63 million. Tecogen raised $18.11 million in a July 2025 follow-on offering, driving financing cash inflows of $17.40 million and ending 2025 with $12.43 million in cash. Management highlighted a growing data center chiller pipeline, including projects with Vertiv, and expects cash burn to decline from the second quarter of 2026.
Tecogen Inc. reported that it shared new investor-oriented content about data center cooling on its website and LinkedIn. The company posted a FAQ document titled “The Future of Data Center Cooling,” explaining how Tecogen’s natural gas and hybrid chillers, and its patented hybrid drive technology, apply to evolving data center designs. The FAQ notes that data centers have multiple cooling loads beyond direct liquid chip cooling, including chilled water systems at about 12–15°C and turbine inlet cooling. It illustrates that a 250 MW data center could need 50–75 Tecogen chillers, or in a chiller‑free design, 100+ hybrid drive power packages for cooling fans. Tecogen emphasizes that rising power needs and tighter peak‑power constraints support demand for solutions that reduce peak electricity usage.