Slide 1: Commercializing Innovative Combustion & Sensing Technologies
Commercializing Innovative Combustion & Sensing Technologies NASDAQ: CLIR Corporate Presentation May 2026
Slide 2: Safe Harbor Statement
Safe Harbor Statement This presentation is made solely for informational purposes and no representation or warranty, express or implied, is made by ClearSign Technologies Corporation (“ClearSign,” “we,” “us,” “our,” and, together with our subsidiaries, the “Company”) or any of its representatives as
Slide 3: Corporate Overview
Corporate Overview ClearSign is an industrial technology company specializing in advanced combustion and sensing solutions, offering a suite of products built around its proprietary ClearSign Core technology. • Technologies Solutions Provider: Cost effective solutions enable industrial operators to
Slide 4: ClearSign in 30 Seconds
ClearSign in 30 Seconds Prevents Air Pollution & Enables Decarbonization Nitrogen Oxides (NOX) are a highly toxic and highly regulated pollutant from combustion. We essentially prevent the emissions of NOX from industrial sources and enable decarbonization by increasing operational efficiency and fa
Slide 5: Transforming Industrial Combustion
Transforming Industrial Combustion Problem Nitrogen from the air is converted into the pollutant NOX by two chemical paths in a flame. Disruptive Solution Incumbent burners address just ClearSign’s burners address both one to reduce emissions. chemical paths that form NOX. Plus, a “plug-and play” de
Slide 6: Primed for Sustained Growth
Primed for Sustained Growth • Rationalized product line-up • Asset light approach that leverages infrastructure of established industry partners • Attractive operating margins and highly scalable “plug-and-play” designs suitable for new builds and retrofits • Robust IP protection in large addressabl
Slide 7: Cost-Effective Solution - Process Burners
Cost-Effective Solution - Process Burners Infrastructure Client Los Angeles, CA • Small process heater • Original NOx = 30 ppm • New permit NOx requirement = 7ppm CLIR SCR Economics (Pre-combustion (Incumbent, post- tech) combustion tech) NOx, ppm 6 5 Capital Cost $450,000 $2,200,000 5 Yr Operating
Slide 8: Cost Effective Solution - "M" Series Mid-Stream Burners
Cost Effective Solution - “M” Series Mid-Stream Burners Ultra Low NOx Burners Developed to fit Market Need Sold Through Heater Manufacturer/Channel Partners Convenient Fit typical heaters without modification Installation Low Common alternative burners require Maintenance frequent maintenance and sh
Slide 9: Cost Effective Solution - Low Emission Flares
Cost Effective Solution - Low Emission Flares Ultra Low NOx Flares Developed to fit Market Need Sold Direct to Customers and through Channel Partners Emissions Meet new NOx emission regulations Operational Minimize purchase of assist gas Savings Robust Minimal maintenance, maximize operations Design
Slide 10: Cost Effective Solution - Flame Sensors
Cost Effective Solution - Flame Sensors Sensors for Pilot Burners Developed to Replace Unreliable Traditional Equipment Sold Direct to End Users Operators for Improved Reliability and Safety Global Solution for all burners with a pilot. Market Low Robust design, traditional sensors fail Maintenance
Slide 11: Expanding Sales Channels & Installation Base
Expanding Sales Channels & Installation Base Launched New Flex Fuel & High Efficiency Burners Launched Mid Stream and System Products Expanding Heater OEM Sales Channels Zeeco Cobranding…. 24 Operating Installations (43 burners) 18 Installations in Progress (60 burners) 2 BACT projects 11
Slide 12: Commercialization Advancing
Commercialization Advancing Expanding Order Book Q4 2025 Orders, 71 burners total Three Mid Two Process Four Process Enclosed Two Mid Process Two Process Order Stream Heaters Heaters Heaters Flare Stream Heaters Heater Heaters Power/Gas Refinery Chemical Plant Oil Production Power/Gas Refinery Refin
Slide 13: Large Domestic & Global Market Opportunity
Large Domestic & Global Market Opportunity Estimated Process Burners Installed 28,000 California and Texas 72,000 Total in US “You have the 42,000 280,000 Europe Worldwide best burners Estimated Mid-Stream Market in the world” 10,000 USA (25% of global market) - Lead engineer from 2022 California Re
Slide 14: Future Market Opportunity with Expanded Technology
Future Market Opportunity with Expanded Technology • Successful DOE SBIR funded development project for new flexible fuel burner technology capable 5ppm NOx using 100% NG to 100% H2 fuel gas. • Proven performance across fuel blends representing all typical customer composition. • Demonstrated operat
Slide 15: Capital Markets Snapshot
Capital Markets Snapshot NASDAQ Recent Commercial Developments CLIR • May 14, 2026: Receives Order for Next Phase, the Physical Testing and Demonstration, of 32 Burner Project for California Refinery • Nov. 4, 2025: Receives ClearSign Core "M" Series Burner Order for Market Cap Multinational Energy
Slide 16: Investment Summary
Investment Summary Disruptive burner Asset light, high margin, Diversifying products and technology solution with highly scalable business sales channels, structured robust IP protection model for sustained growth Significant growth Experienced and Cash flow breakeven potential in large proven team
Slide 17: Contact Us
Contact Us ClearSign Technologies Management Team Headquarters 8023 E. 63rd Place, Suite 101 Jim Deller, Ph.D. Matthew Martin Tulsa, Oklahoma 74133 Chief Executive Officer Chief Technology Officer info@clearsign.com Brent Hinds Chief Financial Officer Jeff Lewallen Director, Burner Business Investor