ClearSign Technologies (CLIR) Stock Chart & Stock Price History $0.58 -0.01 (-1.50%) Closing price 08/29/2025 04:00 PM EasternExtended Trading$0.62 +0.03 (+5.60%) As of 08/29/2025 06:39 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 21.04%, with a year-to-date return of -59.42%. In the past month, the stock has increased 3.03%, reflecting recent market activity. As of the latest close, ClearSign Technologies traded at $0.58 with a market cap of $30.64 million and volume of 16,582 shares. Five years ago, the stock traded at $2.29, representing a 74.48% decrease over that period. At the time, it had a market cap of $67.14 million and a volume of 122,183 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-0.12%1 Month Performance+3.03%3 Month Performance-12.66%Year-To-Date Performance-59.42%1 Year Performance-21.04%5 Year Performance-74.48% CLIR Stock Chart for Saturday, August, 30, 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 Capitalization08/29/2025$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 million08/22/2025$0.57$0.59+2.63%$0.62$0.5891,003 shs$30.93 million08/21/2025$0.54$0.57+5.91%$0.58$0.55100,806 shs$30.14 million08/20/2025$0.54$0.54+1.46%$0.55$0.5419,961 shs$28.46 million08/19/2025$0.56$0.54-4.46%$0.55$0.5243,735 shs$28.05 million08/18/2025$0.56$0.56-0.37%$0.59$0.5635,124 shs$29.36 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. 08/15/2025$0.61$0.56-8.32%$0.60$0.5677,336 shs$29.47 million08/14/2025$0.59$0.61+4.79%$0.62$0.5876,670 shs$32.15 million08/13/2025$0.53$0.59+10.38%$0.59$0.5562,063 shs$30.67 million08/12/2025$0.54$0.53-1.83%$0.57$0.50118,126 shs$27.79 million08/11/2025$0.56$0.54-3.59%$0.57$0.5380,030 shs$28.31 million08/08/2025$0.56$0.56-0.30%$0.58$0.5598,626 shs$29.37 million08/07/2025$0.58$0.56-2.47%$0.59$0.5458,916 shs$29.45 million08/06/2025$0.55$0.58+4.35%$0.58$0.5630,550 shs$30.20 million08/05/2025$0.55$0.55+0.90%$0.57$0.5459,871 shs$28.94 million08/04/2025$0.56$0.55-2.30%$0.57$0.5429,211 shs$28.68 million08/01/2025$0.58$0.56-2.95%$0.58$0.5445,097 shs$29.36 million07/31/2025$0.57$0.58+1.75%$0.60$0.5713,530 shs$30.25 million07/30/2025$0.60$0.57-4.71%$0.63$0.5765,041 shs$29.73 million07/29/2025$0.63$0.60-5.54%$0.65$0.6054,542 shs$31.20 million Related Companies OWLT Stock Chart SEER Stock Chart RPID Stock Chart PRE Stock Chart INTT Stock Chart NAUT Stock Chart OPXS Stock Chart ODYS Stock Chart OPTX Stock Chart AATC 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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