Live Earnings Conference Call: ClearSign Technologies will host a live Q1 2026 earnings call on May 20, 2026 at 5:00PM ET. Follow this link to get details and listen to ClearSign Technologies' Q1 2026 earnings call when it goes live. Get details. ClearSign Technologies (CLIR) Stock Chart & Stock Price History $4.64 +0.23 (+5.12%) Closing price 05/19/2026 03:46 PM EasternExtended Trading$4.51 -0.12 (-2.61%) As of 05/19/2026 05:10 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 Massive. 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 34.67%, with a year-to-date return of -16.63%. In the past month, the stock has decreased 14.31%, reflecting recent market activity. As of the latest close, ClearSign Technologies traded at $4.64 with a market cap of $25.08 million and volume of 6,202 shares. Five years ago, the stock traded at a split-adjusted price of $46.40, representing a 90.01% decrease over that period. At the time, it had a market cap of $145.28 million and a volume of 6,048 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 TermsSMS is currently available in Australia, Belgium, Canada, France, Germany, Ireland, Italy, New Zealand, the Netherlands, Singapore, South Africa, Spain, Switzerland, the United Kingdom, and the United States. 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Read our full terms of service and privacy policy. 5 Day Performance-1.57%1 Month Performance-14.31%3 Month Performance-22.07%Year-To-Date Performance-16.63%1 Year Performance-34.67%5 Year Performance-90.01% CLIR Stock Chart for Wednesday, May, 20, 2026 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 DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization05/19/2026$4.41$4.64+5.12%$4.65$4.466,202 shs$25.08 million05/18/2026$4.71$4.41-6.37%$4.82$4.4125,389 shs$23.86 million05/15/2026$5.20$4.71-9.42%$5.07$4.6221,737 shs$25.48 million05/14/2026$4.45$5.20+16.85%$5.56$4.5729,258 shs$28.13 million05/13/2026$4.55$4.45-2.20%$4.74$4.3516,117 shs$24.07 million05/12/2026$4.36$4.55+4.36%$4.75$4.3717,330 shs$24.62 million05/11/2026$4.54$4.36-3.96%$4.61$4.1822,509 shs$23.58 million05/08/2026$4.83$4.54-6.00%$4.80$4.2126,176 shs$26.13 million05/07/2026$4.91$4.83-1.63%$4.98$4.6216,310 shs$26.13 million05/06/2026$4.91$4.91$5.01$4.8015,732 shs$26.56 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. 05/05/2026N/A$4.91$4.99$4.884,994 shs$26.56 million04/30/2026$5.37$5.00-6.89%$5.33$5.009,145 shs$27.05 million04/29/2026$5.33$5.37+0.75%$5.56$5.332,882 shs$29.05 million04/28/2026$5.23$5.33+1.91%$5.51$5.329,439 shs$28.84 million04/27/2026$5.08$5.23+3.05%$5.33$4.7314,682 shs$28.29 million04/24/2026$5.16$5.08-1.65%$5.26$5.005,725 shs$27.46 million04/23/2026$5.59$5.16-7.69%$5.50$5.0615,246 shs$27.91 million04/22/2026$5.40$5.59+3.52%$5.80$5.4812,982 shs$30.24 million04/21/2026$5.41$5.40-0.18%$5.53$5.2111,908 shs$29.21 million04/20/2026$5.45$5.41-0.73%$5.66$5.1955,957 shs$29.27 million Related Companies OPXS Stock Chart ODYS Stock Chart PRPO Stock Chart AATC Stock Chart DAIO Stock Chart BNGO Stock Chart MSAI Stock Chart ASTC Stock Chart STAI Stock Chart SMIT 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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