Every 8-K that Tecogen Inc. (TGEN) has filed with the SEC in the last 24 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 8-K covers material events a company has to report between its quarterly reports, so if you follow TGEN and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full TGEN filings page.
Tecogen Inc. (TGEN) reports that it has filed a Registration Statement on Form S-3 with the SEC to cover the reoffer and resale of 4,507,603 shares of common stock by certain selling stockholders. All shares were originally acquired in private placement transactions exempt from Securities Act registration.
Trusts associated with the Hatsopoulos family, holding 3,475,714 of these shares, entered into lock-up agreements that restrict most transfers for 182 calendar days starting on the date the SEC declares the S-3 effective, subject to limited exceptions. A form of the lock-up agreement is filed as Exhibit 99.1. Sales by selling stockholders may occur only after the S-3 becomes effective.
Tecogen Inc. reported weaker results for the quarter and six months ended June 30, 2026. Quarterly revenues were $5.75 million, down 21.2% from 2025, driven by a 64.0% drop in Products revenue to $1.13 million, partly offset by Services growth of 10.3% to $4.38 million and Energy Production growth of 35.4% to $0.24 million. Gross profit was $2.17 million, with gross margin improving to 37.8% from 33.8% on higher Products segment margin.
Loss from operations widened to $2.15 million from $1.41 million, and net loss attributable to Tecogen increased to $2.15 million (loss of $0.07 per share) from $1.46 million (loss of $0.06). Adjusted EBITDA for the quarter was negative $1.68 million, compared with negative $1.16 million a year earlier.
For the first half of 2026, revenues were $12.08 million, down 17.1%, with Products revenue down 59.4% and Services up 9.8%. Net loss for the six months was $4.27 million (loss of $0.14 per share) versus $2.12 million in 2025. Cash and cash equivalents were $6.78 million at June 30, 2026, compared with $12.43 million at year-end. Management highlighted a non–data center backlog of approximately $8 million, expected additional orders of $2 million or more, and recent product demonstrations with large data centers representing more than 8 gigawatts of existing capacity.
Tecogen Inc. approved new equity awards and salary increases for its chief executive and other named executive officers. On June 26, 2026, the Board granted restricted stock and incentive stock options under the 2022 Stock Incentive Plan, including to CEO Abinand Rangesh, who received 174,081 shares of restricted stock and options on 26,041 shares. The awards vest in four equal annual installments and the options are exercisable at $5.17 per share. The Board also raised Mr. Rangesh’s annual base salary by 5% to $220,500, and increased base salaries for the other named officers by 3%, with new annual salaries ranging from $152,260 to $206,000.
Tecogen Inc. reported the results of its 2026 Annual Meeting of Stockholders. Shareholders elected seven directors to serve until the 2027 annual meeting or until successors are elected and qualified, including John M. Albertine, Angelina M. Galiteva, Ahmed F. Ghoniem, John N. Hatsopoulos, Susan F. Hirsch, Earl R. Lewis III, and Abinand Rangesh.
Stockholders also ratified the appointment of Wolf & Company, P.C. as independent registered public accountants for the fiscal year ending December 31, 2026. In advisory votes, a majority approved the compensation paid to named executive officers for 2025 and recommended holding say‑on‑pay votes every three years.
Tecogen Inc. reported weaker results for the quarter ended March 31, 2026. Revenue was $6.34 million, down from $7.28 million, as product sales fell sharply while services and energy production grew modestly. Net loss widened to $2.12 million, compared with a $0.66 million loss a year earlier, driven by lower gross profit and higher operating expenses.
Gross profit was $2.59 million with a margin of 40.9%, down from 44.3%. Operating expenses rose to $4.73 million as the company invested in its hybrid-drive chiller and data center initiatives. Adjusted EBITDA declined to negative $1.68 million from negative $0.38 million. Tecogen ended the quarter with $9.33 million in cash and cash equivalents and highlighted an expected 1 MW chiller purchase order from Vertiv and more than $8 million of customer-approved projects, including $2.3 million already under purchase order with deposits.
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. 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.
Tecogen Inc. (TGEN) filed an 8-K announcing Q3 2025 earnings materials. The company furnished a press release with earnings commentary for the three and nine months ended September 30, 2025, under Item 2.02.
It also furnished an investor presentation under Item 7.01 to accompany an earnings conference call. The materials are attached as Exhibit 99.1 (press release, dated November 12, 2025) and Exhibit 99.2 (earnings call presentation, dated November 13, 2025). The company states these exhibits are being furnished and are not deemed “filed” for purposes of Section 18, nor incorporated by reference except as expressly set forth.
Tecogen Inc. reported that on September 17, 2025 it posted a new investor presentation on its website titled “Frequently Asked Questions - Tecogen Chillers for Artificial (AI) Data Centers.” This FAQ addresses questions from stockholders, analysts, and others about how Tecogen’s chillers are intended to be used in artificial intelligence data centers.
The company also reminded investors that important information about its business and products may be shared on its website and on social media platforms such as LinkedIn and X. Some of these postings may at times contain information that is considered material and nonpublic until broadly disseminated, so the company encourages investors and analysts to review these online channels for updates.
Tecogen Inc. reported that its Audit Committee approved the early repayment of two promissory notes held by director John N. Hatsopoulos with an aggregate principal of $1,000,000. These notes, dated October 2023 and July 2024 with interest rates of 5.12% and 5.06%, had both been amended to mature on July 31, 2026.
The October note was prepaid on September 3, 2025 and the July note on September 4, 2025, for total payments of $1,076,955.62, including aggregate interest of $76,955.62. By repaying these notes, Tecogen eliminated all of its outstanding debt and avoided approximately $46,159 of additional interest expenses that would have accrued through the original maturity date.
Tecogen Inc. furnished earnings materials related to the three- and six-month periods ended June 30, 2025. The company issued a press release containing earnings commentary and supplemental information, and it has attached that press release as Exhibit 99.1 to this Current Report. Separately, Tecogen is furnishing an investor slide deck to be presented online in connection with an earnings conference call; that deck is attached as Exhibit 99.2.
The filing clarifies these items are being furnished (not "filed") for purposes of the Exchange Act. The 8-K itself does not include detailed financial figures; interested parties should review Exhibits 99.1 and 99.2 for the underlying earnings metrics and commentary.
Tecogen (TGEN) filed an 8-K announcing governance and compensation changes dated 24 Jul 2025. The board has split the CEO and CFO/Treasurer roles; CEO Dr. Abinand Rangesh resigned as CFO/Treasurer and remains CEO & director. Roger P. Deschenes, CAO since Sept 2020 and former division CFO at L3, was appointed CFO, Principal Financial Officer and Treasurer while retaining his CAO duties, a move intended to strengthen internal controls.
Compensation adjustments: the committee raised Deschenes’ salary to $180k and granted equity worth ≈$200k (17,964 restricted shares plus 12,063 ISOs, 25 % annual vesting). Rangesh received ≈$600k in equity (53,892 RSAs, 24,075 ISOs, 12,048 NQ options). General Counsel John K. Whiting IV and VP Business Development Stephen Lafaille each received ≈$200k in equity and salary increases to $180k. All options are priced at the 24 Jul 2025 NYSE American close.
The board also authorized Dr. Rangesh to grant up to $200k in options to non-executive employees. A press release confirming Deschenes’ appointment was issued 28 Jul 2025 (Exhibit 99.1). No financial performance data were disclosed.
On 21 Jul 2025, Tecogen Inc. (TGEN) filed an 8-K announcing the closing of a firm-commitment underwritten public offering of 3,985,000 common shares (incl. 485,000 overallotment) at $5.00 per share. Gross proceeds equal roughly $19.9 million; after underwriting discounts and estimated expenses, net proceeds are about $18.16 million.
Roth Capital Partners served as sole manager and underwriter. Management intends to allocate the cash to product development, expanded sales & marketing, additional staffing, capital expenditures, and working capital as the company pursues entry into the data-center market. Exhibit 99.1 contains a related press release, furnished but not deemed filed under the Exchange Act.