ClearSign Technologies (CLIR) Stock Chart & Stock Price History $0.85 -0.02 (-2.20%) Closing price 10/17/2025 04:00 PM EasternExtended Trading$0.86 +0.01 (+0.59%) As of 10/17/2025 07:31 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock ClearSign Technologies Stock Price Performance The ClearSign Technologies (CLIR) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 1.73%, with a year-to-date return of -40.90%. In the past month, the stock has increased 70.10%, reflecting recent market activity. As of the latest close, ClearSign Technologies traded at $0.85 with a market cap of $44.62 million and volume of 197,038 shares. Five years ago, the stock traded at $2.51, representing a 66.10% decrease over that period. At the time, it had a market cap of $73.59 million and a volume of 43,223 shares. Receive CLIR Stock News and Ratings via EmailSign-up to receive the latest news and ratings for ClearSign Technologies and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. 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Read our full terms of service and privacy policy. 5 Day Performance-7.50%1 Month Performance+70.10%3 Month Performance+46.62%Year-To-Date Performance-40.90%1 Year Performance+1.73%5 Year Performance-66.10% CLIR Stock Chart for Saturday, October, 18, 2025 CLIR Chart by TradingView ClearSign Technologies Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization10/17/2025$0.87$0.85-2.20%$0.90$0.81197,038 shs$44.62 million10/16/2025$0.97$0.87-10.09%$1.02$0.85200,751 shs$45.62 million10/15/2025$1.01$0.97-3.71%$1.00$0.91240,531 shs$50.74 million10/14/2025$0.92$1.01+9.24%$1.01$0.83192,802 shs$52.69 million10/13/2025$0.86$0.92+6.98%$0.93$0.81208,711 shs$48.23 million10/10/2025$0.92$0.86-6.51%$0.92$0.81244,973 shs$45.09 million10/09/2025$0.98$0.92-5.90%$1.00$0.91201,583 shs$48.23 million10/08/2025$0.96$0.98+1.82%$0.99$0.88170,192 shs$51.26 million10/07/2025$1.06$0.96-9.42%$1.11$0.861.19 million shs$50.33 million10/06/2025$0.86$1.06+23.53%$1.12$0.881.33 million shs$55.58 million Get the Latest News and Ratings for CLIR and Related StocksEnter your email address below to receive the latest news and analysts' ratings for ClearSign Technologies and its competitors with MarketBeat's FREE daily newsletter. 10/03/2025$0.84$0.86+1.74%$0.88$0.82187,983 shs$44.99 million10/02/2025$0.79$0.84+6.49%$0.86$0.79255,884 shs$44.22 million10/01/2025$0.77$0.79+2.70%$0.81$0.7767,007 shs$41.52 million09/30/2025$0.80$0.77-3.73%$0.83$0.75110,926 shs$40.43 million09/29/2025$0.81$0.80-0.62%$0.87$0.78295,591 shs$42.00 million09/26/2025$0.73$0.81+10.24%$0.86$0.78457,017 shs$42.26 million09/25/2025$0.76$0.73-3.54%$0.78$0.71153,263 shs$38.33 million09/24/2025$0.72$0.76+6.01%$0.77$0.72195,699 shs$39.74 million09/23/2025$0.84$0.72-14.65%$0.89$0.64951,269 shs$37.49 million09/22/2025$0.68$0.84+22.88%$0.90$0.612.65 million shs$43.92 million09/19/2025$0.50$0.68+36.26%$0.95$0.5136.05 million shs$35.74 million09/18/2025$0.51$0.50-1.46%$0.54$0.48392,805 shs$26.23 million09/17/2025$0.50$0.51+0.83%$0.53$0.48178,829 shs$26.62 million Related Companies PRE Stock Chart RPID Stock Chart OWLT Stock Chart SEER Stock Chart KEQU Stock Chart NAUT Stock Chart OPXS Stock Chart INTT Stock Chart OPTX Stock Chart ODYS Stock Chart Receive CLIR Stock News and Ratings via EmailSign-up to receive the latest news and ratings for ClearSign Technologies and its competitors with MarketBeat's FREE daily newsletter. 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