Cytosorbents (CTSO) Stock Chart & Stock Price History $0.47 0.00 (-0.57%) Closing price 05/20/2026 04:00 PM EasternExtended Trading$0.46 -0.01 (-1.66%) As of 05/20/2026 07:41 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 ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Cytosorbents Stock Price Performance The Cytosorbents (CTSO) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 46.00%, with a year-to-date return of -26.50%. In the past month, the stock has decreased 24.35%, reflecting recent market activity. As of the latest close, Cytosorbents traded at $0.47 with a market cap of $29.50 million and volume of 91,375 shares. Five years ago, the stock traded at $8.43, representing a 94.43% decrease over that period. At the time, it had a market cap of $365.18 million and a volume of 127,202 shares. Receive CTSO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Cytosorbents 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. By 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. 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Read our full terms of service and privacy policy. 5 Day Performance-5.59%1 Month Performance-24.35%3 Month Performance-26.62%Year-To-Date Performance-26.50%1 Year Performance-46.00%5 Year Performance-94.43% CTSO Stock Chart for Thursday, May, 21, 2026 CTSO Chart by TradingView Cytosorbents 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 Capitalization05/20/2026$0.47$0.47-0.57%$0.48$0.4591,375 shs$29.50 million05/19/2026$0.48$0.47-1.36%$0.50$0.4638,245 shs$29.67 million05/18/2026$0.50$0.48-3.74%$0.53$0.45171,818 shs$30.08 million05/15/2026$0.54$0.50-8.16%$0.55$0.49190,000 shs$31.20 million05/14/2026$0.57$0.54-5.05%$0.60$0.51305,628 shs$33.97 million05/13/2026$0.59$0.57-2.61%$0.61$0.5792,728 shs$35.78 million05/12/2026$0.63$0.59-7.00%$0.63$0.5843,312 shs$36.74 million05/11/2026$0.61$0.63+3.45%$0.63$0.6162,594 shs$39.50 million05/08/2026$0.61$0.61-0.08%$0.63$0.6040,750 shs$38.22 million05/07/2026$0.57$0.61+6.93%$0.63$0.57163,641 shs$38.22 million Get the Latest News and Ratings for CTSO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Cytosorbents and its competitors with MarketBeat's FREE daily newsletter. 05/06/2026$0.61$0.57-5.80%$0.62$0.57114,947 shs$35.74 million05/05/2026N/A$0.61$0.63$0.6130,024 shs$37.94 million04/30/2026$0.64$0.61-4.04%$0.65$0.6118,017 shs$38.25 million04/29/2026$0.60$0.64+5.95%$0.65$0.6144,499 shs$39.86 million04/28/2026$0.61$0.60-1.96%$0.64$0.6031,618 shs$37.62 million04/27/2026$0.63$0.61-2.58%$0.65$0.6159,320 shs$38.37 million04/24/2026$0.65$0.63-3.04%$0.65$0.6222,065 shs$39.39 million04/23/2026$0.63$0.65+2.68%$0.65$0.6117,292 shs$40.62 million04/22/2026$0.62$0.63+1.61%$0.66$0.6129,503 shs$39.56 million04/21/2026$0.65$0.62-3.74%$0.64$0.6222,615 shs$38.94 million04/20/2026$0.66$0.65-2.26%$0.69$0.6359,124 shs$40.45 million Related Companies TMCI Stock Chart CVRX Stock Chart MBOT Stock Chart SNWV Stock Chart RCEL Stock Chart GUTS Stock Chart NYXH Stock Chart FONR Stock Chart HSDT Stock Chart NNOX Stock Chart Receive CTSO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Cytosorbents and its competitors with MarketBeat's FREE daily newsletter. This page (NASDAQ:CTSO) was last updated on 5/21/2026 by MarketBeat.com Staff. 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