Mersana Therapeutics (MRSN) Stock Chart & Stock Price History $0.29 +0.01 (+3.68%) Closing price 03:57 PM EasternExtended Trading$0.30 +0.01 (+1.72%) As of 04:59 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 ForecastsChartCompetitorsEarningsHeadlinesInsider 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 84.24%, with a year-to-date return of -79.72%. In the past month, the stock has decreased 16.86%, reflecting recent market activity. As of the latest close, Mersana Therapeutics traded at $0.28 with a market cap of $34.86 million and volume of 2.23 million shares. Five years ago, the stock traded at $22.10, representing a 98.69% decrease over that period. At the time, it had a market cap of $1.49 billion and a volume of 769,667 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-0.34%1 Month Performance-16.86%3 Month Performance-5.26%Year-To-Date Performance-79.72%1 Year Performance-84.24%5 Year Performance-98.69% MRSN Stock Chart for Thursday, July, 3, 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 Capitalization07/02/2025$0.28$0.28+0.25%$0.29$0.272.23 million shs$34.86 million07/01/2025$0.30$0.28-5.74%$0.31$0.282.74 million shs$34.77 million06/30/2025$0.29$0.30+1.72%$0.32$0.283.57 million shs$36.89 million06/27/2025$0.33$0.29-10.46%$0.34$0.2915.79 million shs$36.27 million06/26/2025$0.35$0.33-7.14%$0.36$0.322.86 million shs$40.51 million06/25/2025$0.34$0.35+2.46%$0.36$0.341.23 million shs$43.62 million06/24/2025$0.34$0.34+0.29%$0.36$0.341.11 million shs$42.57 million06/23/2025$0.37$0.34-6.91%$0.37$0.331.71 million shs$42.45 million06/20/2025$0.36$0.37+2.75%$0.37$0.352.08 million shs$45.60 million06/19/2025$0.36$0.36$0.36$0.35808,745 shs$44.38 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. 06/18/2025$0.35$0.36+0.76%$0.36$0.35808,745 shs$44.38 million06/17/2025$0.38$0.35-6.98%$0.38$0.351.44 million shs$44.05 million06/16/2025$0.37$0.38+3.46%$0.39$0.351.52 million shs$47.35 million06/13/2025$0.36$0.37+1.13%$0.38$0.351.35 million shs$45.77 million06/12/2025$0.38$0.36-4.55%$0.38$0.362.16 million shs$45.25 million06/11/2025$0.41$0.38-6.54%$0.43$0.382.50 million shs$47.41 million06/10/2025$0.39$0.41+4.15%$0.46$0.384.42 million shs$50.73 million06/09/2025$0.39$0.39+1.27%$0.40$0.382.35 million shs$48.71 million06/06/2025$0.37$0.39+4.78%$0.40$0.362.70 million shs$48.10 million06/05/2025$0.37$0.37-0.19%$0.38$0.361.25 million shs$45.90 million06/04/2025$0.35$0.37+5.79%$0.37$0.341.21 million shs$45.99 million06/03/2025$0.37$0.35-6.71%$0.38$0.343.47 million shs$43.47 million06/02/2025$0.34$0.37+9.01%$0.38$0.343.20 million shs$46.60 million Related Companies IKT Stock Chart BDTX Stock Chart ALEC Stock Chart TIL Stock Chart GALT Stock Chart LXEO Stock Chart KYTX Stock Chart RAPT Stock Chart LYEL Stock Chart SKYE 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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