Tecogen Inc.
- TGEN ยท NYSE
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip
- North Billerica, MA
- 119 employees
- CIK 0001537435
Updated from SEC filings through
Top things to know
Executives
- Abinand Rangesh Chief Executive Officer 4/A, 2026-09-08
- Roger P. Deschenes Chief Financial Officer 4/A, 2026-09-08
- Robert Panora COO and President 4/A, 2026-09-08
- John Kimball Whiting IV General Counsel & Secretary 4/A, 2026-09-08
- Stephen Lafaille VP of Business Development 4/A, 2026-09-08
Tecogen Inc. is a U.S. public company in air-cond & warm air heatg equip & comm & indl refrig equip (SIC 3585), headquartered in North Billerica, MA. It trades as TGEN on NYSE. Revenue was $27.1M in the fiscal year ending December 31, 2025, +19.7% from the year before. It reported about 119 employees. Abinand Rangesh is Chief Executive Officer.
Five-year financials
| Metric | FY2025 | FY2024 | FY2023 | FY2022 | FY2021 |
|---|---|---|---|---|---|
| Revenue | $27.1M 10-K, 2026-03-19 | $22.6M 10-K, 2026-03-19 | $25.1M 10-K, 2025-03-18 | $25.0M 10-K, 2024-03-25 | $24.4M 10-K, 2023-03-23 |
| Operating income | -$8.2M 10-K, 2026-03-19 | -$4.5M 10-K, 2026-03-19 | -$4.4M 10-K, 2025-03-18 | -$2.3M 10-K, 2024-03-25 | -$1.2M 10-K, 2023-03-23 |
| SG&A | $13.5M 10-K, 2026-03-19 | $11.4M 10-K, 2026-03-19 | $11.9M 10-K, 2025-03-18 | $10.9M 10-K, 2024-03-25 | $9.8M 10-K, 2023-03-23 |
| Net income | -$8.2M 10-K, 2026-03-19 | -$4.8M 10-K, 2026-03-19 | -$4.6M 10-K, 2025-03-18 | -$2.4M 10-K, 2024-03-25 | $3.7M 10-K, 2023-03-23 |
Annual figures from XBRL in each company's own filings. Click a figure to open the filing. SG&A marked derived is general and administrative plus selling and marketing.
Leadership and board
| Name | Title | Source |
|---|---|---|
| Abinand Rangesh Chief Executive Officer at Tecogen Inc. | Chief Executive Officer | 4/A, 2026-09-08 |
| Roger P. Deschenes | Chief Financial Officer | 4/A, 2026-09-08 |
| Robert Panora President and COO at Tecogen | COO and President | 4/A, 2026-09-08 |
| John Kimball Whiting IV | General Counsel & Secretary | 4/A, 2026-09-08 |
| Stephen Lafaille | VP of Business Development | 4/A, 2026-09-08 |
| Angelina M. Galiteva | Director, Chairperson of the Board | 10-K, 2026-03-19 |
| Ahmed F. Ghoniem | Director | 10-K, 2026-03-19 |
| Earl R. Lewis III | Director | 10-K, 2026-03-19 |
| John M. Albertine | Director | 10-K, 2026-03-19 |
| John N. Hatsopoulos | Lead Director | 10-K, 2026-03-19 |
| Susan F. Hirsch | Director | 10-K, 2026-03-19 |
What Tecogen Inc. does
, a Delaware corporation (together with its subsidiaries "we", "our", "us", "Tecogen," or "Company") produces commercial and industrial, natural-gas-fueled engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. Our products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a customer facility.
Item 1. Business, 10-K for the year ending December 31, 2025
Shares and governance
| Shares outstanding | 30.2 million (as of August 13, 2026) | 10-Q, August 13, 2026 |
|---|---|---|
| Public float | $84.2M (as of June 30, 2025) | 10-K, March 19, 2026 |
| Reportable segments | 3 (period ending June 30, 2026) | 10-Q, August 13, 2026 |
| Latest proxy statement | Meeting April 21, 2026 (filed April 21, 2026) | DEF 14A, April 21, 2026 |
| Auditor | Wolf & Company, P.c. (Boston, Massachusetts) | Latest 10-K |
Insider trades
Open-market buys and sales by officers and directors, from Forms 4 and 5. One row per filing.
| Date | Insider | Trade | Shares | Value | Source |
|---|---|---|---|---|---|
| April 24, 2026 | Ahmed Ghoniem Director | Buy | 12,723 | $10K | Form 4, April 27, 2026 |
| April 13, 2026 | Susan B. Hirsch Director | Buy | 5,000 | $19K | Form 4, April 14, 2026 |
| March 27, 2026 | Susan B. Hirsch Director | Buy | 10,000 | $25K | Form 4, March 27, 2026 |
| March 27, 2026 | Earl Lewis Director | Buy | 5,000 | $13K | Form 4, March 27, 2026 |
| March 26, 2026 | Earl Lewis Director | Buy | 5,000 | $14K | Form 4, March 27, 2026 |
| March 23, 2026 | John Kimball Whiting IV General Counsel & Secretary | Buy | 10,000 | $24K | Form 4, March 23, 2026 |
| March 20, 2026 | Roger P. Deschenes CAO | Buy | 10,000 | $22K | Form 4, March 23, 2026 |
| March 20, 2026 | Abinand Rangesh Chief Executive Officer | Buy | 3,000 | $7K | Form 4, March 23, 2026 |
Recent 8-K events
- 8-K filed 2026-10-14
- Item 8.01 Other events
- 8-K filed 2026-08-31
- Item 8.01 Other events
- 8-K filed 2026-08-12
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-07-01
- Item 5.02 Departure or appointment of directors or officers; compensation
- 8-K filed 2026-06-05
- Item 5.07 Submission of matters to a vote of security holders
- 8-K filed 2026-05-12
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-04-08
- Item 8.01 Other events
- 8-K filed 2026-03-18
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-01-07
- Item 7.01 Regulation FD disclosure
- 8-K filed 2025-11-12
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
Frequently asked questions about Tecogen Inc.
- What does Tecogen Inc. do?
- In its own words, from Item 1 of its 10-K: ", a Delaware corporation (together with its subsidiaries "we", "our", "us", "Tecogen," or "Company") produces commercial and industrial, natural-gas-fueled engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. Our products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a customer facility."
- What is Tecogen Inc.'s revenue?
- $27.1M for the fiscal year ending December 31, 2025, from its 10-K filed March 19, 2026.
- Is Tecogen Inc. profitable?
- Tecogen Inc. reported net income of -$8.2M for the fiscal year ending December 31, 2025.
- How many employees does Tecogen Inc. have?
- About 119 as of December 31, 2025, as stated in its annual report.
- Who is the CEO of Tecogen Inc.?
- Abinand Rangesh, Chief Executive Officer, as named in a 4/A filed September 8, 2026.
- Who is the CFO of Tecogen Inc.?
- Roger P. Deschenes, Chief Financial Officer, as named in a 4/A filed September 8, 2026.
- Where is Tecogen Inc. headquartered?
- North Billerica, MA.
- What is Tecogen Inc.'s stock ticker?
- TGEN on NYSE.
- What industry is Tecogen Inc. in?
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip, SIC code 3585.
- What is Tecogen Inc.'s website?
- tecogen.com. Investor relations: https://ir.tecogen.com.
- When does Tecogen Inc. report earnings next?
- November 12, 2026 at 09:30. Source: ir_events.
- Is Tecogen Inc. a public company?
- Yes. Tecogen Inc. files with the SEC under CIK 0001537435 and trades as TGEN.
- Who audits Tecogen Inc.?
- Wolf & Company, P.c., Boston, Massachusetts, as named in its latest annual report (10-K).
- How many shares of Tecogen Inc. are outstanding?
- 30.2 million shares as of August 13, 2026, from its 10-Q filed August 13, 2026.
- What is Tecogen Inc.'s public float?
- $84.2M as of June 30, 2025, as reported on the cover of its 10-K filed March 19, 2026.
- How many business segments does Tecogen Inc. report?
- 3 reportable segments for the period ending June 30, 2026, from its 10-Q filed August 13, 2026.
- When is Tecogen Inc.'s annual shareholder meeting?
- April 21, 2026, per its proxy statement (DEF 14A) filed April 21, 2026.
- Have Tecogen Inc. insiders traded stock recently?
- Since March 20, 2026, officers and directors reported 0 open-market sales and 8 purchases worth about $134K on Forms 4 and 5. The most recent: Ahmed Ghoniem (Director) bought 12,723 shares on April 24, 2026.