Mersana Therapeutics (MRSN) Stock Chart & Stock Price History $6.60 -0.25 (-3.65%) Closing price 08/1/2025 04:00 PM EasternExtended Trading$6.60 0.00 (0.00%) As of 08/1/2025 07:43 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 ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Mersana Therapeutics Stock Price Performance The Mersana Therapeutics (MRSN) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 83.60%, with a year-to-date return of -81.54%. In the past month, the stock has decreased 5.61%, reflecting recent market activity. As of the latest close, Mersana Therapeutics traded at $6.60 with a market cap of $32.93 million and volume of 110,562 shares. Five years ago, the stock traded at a split-adjusted price of $497.00, representing a 98.67% decrease over that period. At the time, it had a market cap of $1.33 billion and a volume of 32,214 shares. Receive MRSN Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Mersana Therapeutics and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance-3.37%1 Month Performance-5.61%3 Month Performance-33.62%Year-To-Date Performance-81.54%1 Year Performance-83.60%5 Year Performance-98.67% MRSN Stock Chart for Saturday, August, 2, 2025 MRSN Chart by TradingView Mersana Therapeutics 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 Capitalization08/01/2025$6.85$6.60-3.65%$6.80$6.37110,562 shs$32.93 million07/31/2025$6.75$6.85+1.48%$7.08$6.57107,586 shs$34.15 million07/30/2025$6.95$6.75-2.88%$7.04$6.58142,151 shs$33.68 million07/29/2025$6.83$6.95+1.76%$7.00$6.55190,037 shs$866.18 million07/28/2025N/A$6.83$7.60$6.75224,031 shs$851.23 million07/24/2025$10.14$8.05-20.59%$8.65$7.75368,642 shs$40.14 million07/23/2025$9.09$10.14+11.52%$10.25$9.32164,385 shs$50.55 million07/22/2025$8.98$9.09+1.22%$9.20$8.6339,611 shs$45.33 million07/21/2025$8.82$8.98+1.84%$9.25$8.9570,837 shs$44.78 million07/18/2025$9.08$8.82-2.89%$9.33$8.6259,515 shs$43.97 million Get the Latest News and Ratings for MRSN and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Mersana Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 07/17/2025$8.48$9.08+7.07%$9.44$8.48114,158 shs$45.28 million07/16/2025$8.15$8.48+4.05%$8.75$8.0341,258 shs$42.29 million07/15/2025$8.58$8.15-4.93%$8.58$8.0555,954 shs$40.64 million07/14/2025$8.60$8.58-0.26%$8.89$8.2553,209 shs$42.75 million07/11/2025$9.50$8.60-9.50%$9.75$8.53180,858 shs$42.86 million07/10/2025$8.43$9.50+12.69%$9.74$8.40254,399 shs$47.36 million07/09/2025$8.18$8.43+3.12%$8.64$8.18124,292 shs$42.03 million07/08/2025$7.61$8.18+7.46%$8.32$7.5492,723 shs$40.75 million07/07/2025$7.25$7.61+4.93%$7.83$7.5192,421 shs$37.93 million07/04/2025$7.25$7.25$7.40$7.0074,253 shs$36.14 million07/03/2025$6.99$7.25+3.68%$7.40$7.0074,253 shs$36.14 million07/02/2025$6.98$6.99+0.25%$7.25$6.7589,171 shs$34.86 million07/01/2025$7.40$6.98-5.74%$7.63$6.98109,708 shs$34.77 million Related Companies NKTX Stock Chart KRRO Stock Chart CTNM Stock Chart IMRX Stock Chart THTX Stock Chart ACTU Stock Chart FATE Stock Chart CLLS Stock Chart LXEO Stock Chart CGEN Stock Chart Receive MRSN Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Mersana Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 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