About ClearSign
ClearSign is a company based in Seattle (United States) founded in 2008. ClearSign has raised $1.16 million across 10 funding rounds from investors including DOE and OSTI.GOV. The company has 18 employees. ClearSign offers products and services including ClearSign Coreâ„¢ Process Burners, ClearSign Coreâ„¢ M1, Boiler Burners, Flares, and ClearSign Eyeâ„¢ Flame Sensor. ClearSign operates in a competitive market with competitors including Claros Technologies, JCCL, Nala Earth, Sunborne Systems and John Zink Hamworthy, among others.
- Headquarter Seattle, United States
- Employees 18
- Stage Public
- SectorsEnvironmentEnergy & Utilities
- Email••••••••
- Website clearsign.com
- Social LinkedIn X
- Legal Name Clearsign Technologies Corporation
- Annual Revenue$5.23 M (USD)45.55as on Dec 31, 2025
- Net Profit-$5.5 M (USD)-3.72as on Dec 31, 2025
- EBITDA-$6.39 M (USD)-2.86as on Dec 31, 2025
- Total Equity Funding$1.16M (USD)
in 10 rounds
- Latest Funding Round$1.77M (USD), Post-IPO
Jul 2026
- InvestorsDOE
& 1 more
- Employee Count18
Products & Services of ClearSign
ClearSign offers a comprehensive portfolio of products and services, including ClearSign Core™ Process Burners, ClearSign Core™ M1, Boiler Burners, Flares, and ClearSign Eye™ Flame Sensor.
Burners that reduce NOx emissions in industrial heaters efficiently.
Technology for enhanced efficiency and emissions control in combustion.
Burners delivering low NOx for firetube and watertube boilers.
Modular burners for flaring with high destruction efficiency.
Electrical sensor for flame detection in industrial applications.
Funding Insights of ClearSign
ClearSign has successfully raised a total of $1.16M across 10 strategic funding rounds. The most recent funding activity was a Post-IPO round of $1.77 million completed in July 2026. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $1.16M
- Total Rounds 10
- Last Round Post-IPO — $1.77M
- First Round $1.06M
(Feb 2011)
- Investors Count 2
All 10 funding rounds of ClearSign with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Jul 2026 | $1.77M | Post-IPO | – | – | – |
| Jan 2025 | $400,000 | Grant | – | – | |
| Jun 2024 | $4.34M | Post-IPO | – | – | – |
| Apr 2024 | $5M | Post-IPO | – | – | – |
| Jun 2022 | $1.9M | Grant | – | – | |
| Oct 2020 | $1.31M | Post-IPO | – | – | – |
| Jul 2018 | $11.7M | Post-IPO | – | – | – |
| Jul 2018 | $149,759 | Grant | – | – | |
| Mar 2011 | $100,000 | Seed | – | – | – |
| Feb 2011 | $1.06M | Seed | – | – | – |
2 investors in total: 2 institutional.
Investors in ClearSign
ClearSign has secured backing from 2 investors, including institutional investors. Prominent investors backing the company include DOE and OSTI.GOV.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Energy sources and policies are managed by the DOE. | 1977 | energy.gov | - | |
Scientific and technical information is managed and disseminated by OSTI.GOV. | – | osti.gov | Oak Ridge, United States |
Investor details for ClearSign
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
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People of ClearSign
6 people are tracked at ClearSign (4 in leadership, 2 in board & advisors); the tracked headcount is 18.
| Name | Role | Group |
|---|---|---|
Manny Menendez | President ClearSign Asia | Leadership |
Jim Deller | Chief Executive Officer | Leadership |
Brent Hinds | Chief Financial Officer | Leadership |
Matthew Martin | Chief Technology Officer | Leadership |
Bruce Pate | Director | Board & advisors |
Lon E. Bell | Director | Board & advisors |
Complete people profiles for ClearSign
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IPO & Listings of ClearSign
ClearSign is a publicly listed company on the NASDAQ with ticker symbol CLIR in USA, operating in the Producer manufacturing sector. As a publicly traded entity, the company provides investors with opportunities to participate in its growth story through equity ownership. The listing enables access to capital markets, enhances corporate visibility, and provides liquidity for shareholders while maintaining transparency through regulatory compliance and regular financial disclosures.
- IPO date25 Apr 2012
- Listed onNASDAQ: CLIR
- Listed entityClearSign Technologies Corporation
- Exchange sectorProducer manufacturing
Timeline of ClearSign
4 dated milestones of ClearSign across 18 years, from founding to its latest funding, stage changes and deals.
- Founded ClearSign is founded.
- Funding First funding round of $1.1M.
- IPO Lists on the stock exchange (IPO).
- Funding Latest funding round, Post-IPO, of $1.8M.
Competitors of ClearSign
ClearSign operates in a dynamic and competitive business environment, facing competition from various established players and emerging companies in the market. The competitive landscape includes prominent companies such as Claros Technologies, JCCL, Nala Earth, Sunborne Systems and John Zink Hamworthy, among others.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| clarostechnologies.com | 2015 | Saint Paul, United States | $57.7M | – | Provider of sustainable solutions for circular economy | |
| jccl.jp | 2020 | Fukuoka, Japan | $4.07M | – | Provider of carbon dioxide recovery and recycling solutions | |
| nala.earth | 2023 | Berlin, Germany | $5.75M | – | Company allows businesses to measure, manage, and report their impact on nature | |
| sunbornesystems.com | 2021 | Harwell, United Kingdom | $2.59M | – | Hydrogen-based fuel is provided via an online platform. | |
| johnzinkhamworthy.com | 1929 | Tulsa, United States | – | – | Emission control and management solutions are provided for industrial operations. | |
| anguil.com | 1978 | Milwaukee, United States | – | 93 | Designs and supplies systems for air and water pollution control in various industries. | |
| mynzocarbon.com | 2022 | Gurugram, India | $1.5M | – | Carbon emission management solutions are provided via a monitoring platform. | |
| fuelsave.de | 2012 | Walldorf, Germany | $37.79M | 5 | Offers solutions to improve fuel efficiency in engines. | |
| albonair.com | 2007 | Dortmund, Germany | – | 97 | Delivers advanced exhaust aftertreatment systems for automotive applications. |
Detailed competitors of ClearSign
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Web traffic of ClearSign
The website of ClearSign (clearsign.com) receives about 3.4K visits a month.
- Monthly visits3.4K
▼ 7.5% vs previous month
Latest news on Clearsign
Complete news archive for ClearSign
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Similar companies to ClearSign
10 companies that operate in the same segment as ClearSign (Pollution & Air Quality Systems), ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Platform for enterprise sustainability measurement, reporting, and action is provided. | 2019 | San Francisco, California, United States | USD 184.96 M | – | 295 | |
Weather intelligence and forecasting solutions are provided for industries. | 2016 | Boston, Massachusetts, United States | USD 374 M | – | 115 | |
Carbon dioxide is converted into products via renewable energy technology. | 2015 | Berkeley, California, United States | USD 472.37 M | – | – | |
Independent ratings and risk analytics for carbon projects are provided. | 2020 | London, England, United Kingdom | USD 109.21 M | – | – | |
Carbon dioxide is captured from the atmosphere by Carbon Engineering. | 2009 | Squamish, British Columbia, Canada | USD 107.06 M | – | – | |
Cloud-based solutions for crop management and analytics are offered. | 2016 | Durham, North Carolina, United States | USD 60.75 M | – | 103 | |
Microbe-based plant protection products and yield optimization services are provided. | 2013 | Boston, Massachusetts, United States | USD 1.4 B | – | – | |
Provider of modular carbon capture technology and industrial decarbonization solutions | 2009 | London, England, United Kingdom | USD 248.83 M | USD 7.24 M | – | |
Carbon footprints are tracked via an online platform for users. | 2010 | Wellington, New Zealand | USD 26.27 M | – | – | |
A platform for logistics emissions calculation and reporting is provided. | 2021 | London, England, United Kingdom | USD 14.5 M | – | 20 |
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Frequently Asked Questions about ClearSign
ClearSign was founded in 2008 and raised its 1st funding round 3 years after it was founded.
ClearSign is headquartered in Seattle, United States. It is registered at Seattle, Washington, United States.
ClearSign is a funded company, having raised a total of $1.16M across 10 funding rounds to date. The company's 1st funding round was a Seed of $1.06M, raised on Feb 2011.
ClearSign has 18 employees.
Annual revenue of ClearSign is $5.23M as on Dec 31, 2025.
ClearSign was founded in 2008 and is based in Seattle, United States. Combustion efficiency enhancement technologies are developed and provided for sectors including chemical, petrochemical, refinery, power, and commercial boiler industries. Duplex and Electrodynamic Combustion Control platforms are utilized to improve system performance. Retrofit strategies are offered to achieve emissions control and enhance combustion operations across these markets.
ClearSign's top competitors include Claros Technologies, Nala Earth and JCCL.
ClearSign offers ClearSign Coreâ„¢ Process Burners, ClearSign Coreâ„¢ M1, Boiler Burners, Flares, and ClearSign Eyeâ„¢ Flame Sensor.
Yes, ClearSign is publicly traded on NASDAQ under the ticker symbol CLIR.
ClearSign operates through Clearsign Technologies Corporation.