Mersana Therapeutics (MRSN) Stock Chart & Stock Price History $7.75 -0.36 (-4.44%) Closing price 04:00 PM EasternExtended Trading$7.75 0.00 (0.00%) As of 05:38 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 78.01%, with a year-to-date return of -78.32%. In the past month, the stock has decreased 14.76%, reflecting recent market activity. As of the latest close, Mersana Therapeutics traded at $8.11 with a market cap of $40.47 million and volume of 308,536 shares. Five years ago, the stock traded at a split-adjusted price of $439.25, representing a 98.24% decrease over that period. At the time, it had a market cap of $1.26 billion and a volume of 18,235 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+8.24%1 Month Performance-14.76%3 Month Performance-20.51%Year-To-Date Performance-78.32%1 Year Performance-78.01%5 Year Performance-98.24% MRSN Stock Chart for Friday, August, 22, 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 Capitalization08/21/2025$7.29$8.11+11.25%$8.13$7.10308,536 shs$40.47 million08/20/2025$7.24$7.29+0.69%$7.39$6.9636,837 shs$36.38 million08/19/2025$7.38$7.24-1.90%$7.42$7.0377,280 shs$36.14 million08/18/2025$7.16$7.38+3.07%$7.68$7.0799,147 shs$36.83 million08/15/2025$7.42$7.16-3.50%$7.44$7.0079,994 shs$35.73 million08/14/2025$6.81$7.42+8.96%$7.72$6.82226,499 shs$37.03 million08/13/2025$6.07$6.81+12.19%$6.82$5.21253,830 shs$33.95 million08/12/2025$5.97$6.07+1.68%$6.31$5.9752,767 shs$30.29 million08/11/2025$6.30$5.97-5.24%$6.29$5.8597,500 shs$29.79 million08/08/2025$6.61$6.30-4.69%$6.60$6.2299,059 shs$31.44 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. 08/07/2025$6.70$6.61-1.34%$6.81$6.4088,676 shs$32.98 million08/06/2025$7.04$6.70-4.83%$7.00$6.6454,469 shs$33.43 million08/05/2025$6.86$7.04+2.62%$7.05$6.7480,463 shs$35.13 million08/04/2025$6.60$6.86+3.94%$6.96$6.5555,324 shs$34.23 million08/01/2025$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 million Related Companies IOBT Stock Chart MOLN Stock Chart IMRX Stock Chart GNLX Stock Chart HURA Stock Chart CTOR Stock Chart CLYM Stock Chart ALTS Stock Chart ACOG Stock Chart IKT 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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