Trinseo (TSE) Stock Chart & Stock Price History $2.02 -0.03 (-1.46%) Closing price 10/8/2025 03:59 PM EasternExtended Trading$2.02 0.00 (0.00%) As of 10/8/2025 07:40 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 ForecastsChartCompetitorsDividendEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Trinseo Stock Price Performance The Trinseo (TSE) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 67.05%, with a year-to-date return of -60.39%. In the past month, the stock has decreased 16.53%, reflecting recent market activity. As of the latest close, Trinseo traded at $2.02 with a market cap of $72.62 million and volume of 378,788 shares. Five years ago, the stock traded at $29.43, representing a 93.14% decrease over that period. At the time, it had a market cap of $1.13 billion and a volume of 412,360 shares. Receive TSE Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Trinseo 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. Text HELP for help/customer support. 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Read our full terms of service and privacy policy. 5 Day Performance-13.53%1 Month Performance-16.53%3 Month Performance-31.99%Year-To-Date Performance-60.39%1 Year Performance-67.05%5 Year Performance-93.14% TSE Stock Chart for Thursday, October, 9, 2025 TSE Chart by TradingView Trinseo 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 Capitalization10/08/2025$2.05$2.02-1.22%$2.09$1.99378,788 shs$72.62 million10/07/2025$2.08$2.05-1.68%$2.12$2.01212,781 shs$73.52 million10/06/2025$2.34$2.08-10.96%$2.30$2.04513,674 shs$74.78 million10/03/2025$2.29$2.34+2.23%$2.41$2.3288,634 shs$83.98 million10/02/2025$2.26$2.29+1.33%$2.34$2.21105,499 shs$82.15 million10/01/2025$2.35$2.26-4.04%$2.39$2.25108,377 shs$81.07 million09/30/2025$2.37$2.35-0.63%$2.38$2.27151,390 shs$84.48 million09/29/2025$2.49$2.37-4.83%$2.53$2.36166,742 shs$85.02 million09/26/2025$2.57$2.49-3.12%$2.64$2.47218,715 shs$89.34 million09/25/2025$2.59$2.57-0.97%$2.63$2.46275,127 shs$92.22 million Get the Latest News and Ratings for TSE and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Trinseo and its competitors with MarketBeat's FREE daily newsletter. 09/24/2025$2.60$2.59-0.19%$2.73$2.55219,674 shs$93.11 million09/23/2025$2.59$2.60+0.23%$2.64$2.53179,013 shs$93.29 million09/22/2025$2.53$2.59+2.33%$2.63$2.40225,652 shs$93.08 million09/19/2025$2.61$2.53-3.07%$2.63$2.471.11 million shs$90.95 million09/18/2025$2.45$2.61+6.53%$2.63$2.45172,978 shs$93.83 million09/17/2025$2.53$2.45-2.97%$2.69$2.45316,110 shs$88.08 million09/16/2025$2.40$2.53+5.43%$2.55$2.36188,226 shs$90.77 million09/15/2025$2.43$2.40-1.44%$2.51$2.34196,825 shs$86.10 million09/12/2025$2.43$2.43$2.47$2.36119,215 shs$87.36 million09/11/2025$2.28$2.43+6.81%$2.48$2.26265,135 shs$87.36 million09/10/2025$2.42$2.28-5.99%$2.55$2.27235,234 shs$81.79 million09/09/2025$2.41$2.42+0.62%$2.43$2.34132,089 shs$86.29 million09/08/2025$2.45$2.41-1.64%$2.45$2.31205,037 shs$86.46 million Related Companies ARQ Stock Chart Aemetis Stock Chart Verde Clean Fuels Stock Chart Comstock Stock Chart Flexible Solutions International Stock Chart Zentek Stock Chart Alto Ingredients Stock Chart Origin Materials Stock Chart Loop Industries Stock Chart Cibus Stock Chart Receive TSE Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Trinseo and its competitors with MarketBeat's FREE daily newsletter. 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