ClearSign Technologies (CLIR) Stock Chart & Stock Price History $0.81 +0.07 (+10.24%) Closing price 04:00 PM EasternExtended Trading$0.81 +0.00 (+0.36%) As of 07:42 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 decreased 9.01%, with a year-to-date return of -44.02%. In the past month, the stock has increased 38.98%, reflecting recent market activity. As of the latest close, ClearSign Technologies traded at $0.73 with a market cap of $38.33 million and volume of 153,263 shares. Five years ago, the stock traded at $2.19, representing a 63.19% decrease over that period. At the time, it had a market cap of $64.21 million and a volume of 106,823 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+18.25%1 Month Performance+38.98%3 Month Performance+41.42%Year-To-Date Performance-44.02%1 Year Performance-9.01%5 Year Performance-63.19% CLIR Stock Chart for Friday, September, 26, 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 Capitalization09/26/2025$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 million09/16/2025$0.53$0.50-5.04%$0.53$0.46550,952 shs$26.40 million09/15/2025$0.55$0.53-2.89%$0.57$0.53160,107 shs$27.80 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. 09/12/2025$0.55$0.55+0.18%$0.56$0.54103,910 shs$28.63 million09/11/2025$0.57$0.55-3.88%$0.58$0.5487,623 shs$28.57 million09/10/2025$0.58$0.57-2.36%$0.60$0.5768,346 shs$29.73 million09/09/2025$0.59$0.58-0.77%$0.60$0.5743,294 shs$30.45 million09/08/2025$0.59$0.59-0.65%$0.60$0.5953,634 shs$30.68 million09/05/2025$0.58$0.59+1.36%$0.60$0.5840,696 shs$30.88 million09/04/2025$0.60$0.58-2.34%$0.60$0.5849,296 shs$30.47 million09/03/2025$0.60$0.60-0.17%$0.60$0.5836,167 shs$31.19 million09/02/2025$0.58$0.60+2.00%$0.61$0.5846,027 shs$31.25 million09/01/2025$0.58$0.58$0.60$0.5816,582 shs$30.64 million08/29/2025$0.59$0.58-1.50%$0.60$0.5816,582 shs$30.64 million08/28/2025$0.59$0.59+0.17%$0.60$0.5840,226 shs$31.10 million08/27/2025$0.58$0.59+2.10%$0.60$0.5835,861 shs$31.05 million08/26/2025$0.59$0.58-0.85%$0.61$0.5788,588 shs$30.41 million08/25/2025$0.59$0.59-0.85%$0.61$0.5781,597 shs$30.67 million Related Companies INTT Stock Chart NAUT Stock Chart OPXS Stock Chart ODYS Stock Chart OPTX Stock Chart AATC Stock Chart DAIO Stock Chart PRPO Stock Chart MSAI Stock Chart STAI 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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