Mersana Therapeutics (MRSN) Insider Trading & Ownership $7.66 +0.03 (+0.39%) Closing price 08/28/2025 04:00 PM EasternExtended Trading$7.67 +0.01 (+0.13%) As of 08/28/2025 07:54 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 Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Mersana Therapeutics (NASDAQ:MRSN) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage13.00%Number OfInsiders Buying(Last 12 Months)0Number OfInsiders Selling(Last 12 Months)7Amount OfInsider Selling(Last 12 Months)$153.93K Get MRSN Insider Trade Alerts Want to know when executives and insiders are buying or selling Mersana Therapeutics stock? 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MRSN Insider Buying and Selling by Quarter Mersana Therapeutics Insider and Congressional Trades History Insiders and Members of Congress Insiders Only Members of Congress Only Transaction Type Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 2 Years 3 Years Time Frame Start Date End Date Export to Excel Transaction DateNameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionDetails1/16/2025Anna ProtopapasDirectorSell345$14.50$5,002.50 1/16/2025Ashish MandeliaCAOSell142$14.50$2,059.00 1/16/2025Martin H Jr. HuberCEOSell180$14.50$2,610.00 1/16/2025Timothy B LowingerSVPSell321$14.50$4,654.50 1/14/2025Anna ProtopapasDirectorSell461$16.50$7,606.50 1/14/2025Ashish MandeliaCAOSell40$16.50$660.00 1/14/2025Timothy B LowingerSVPSell139$16.50$2,293.50 10/28/2024Mohan BalaSVPSell75$47.50$3,562.50 10/3/2024Alejandra CarvajalSVPSell223$49.00$10,927.00 10/2/2024Ashish MandeliaCAOSell194$50.00$9,700.00 Get Insider Trades Delivered To Your InboxEnter your email address below to receive a concise daily summary of insider buying activity, insider selling activity and changes in hedge fund holdings. 10/2/2024Brian DeschuytnerCFOSell323$50.00$16,150.00 9/12/2024Martin H Jr. HuberCEOSell2,016$44.00$88,704.00 (Data available from 1/1/2013 forward) MRSN Insider Trading Activity - Frequently Asked Questions Who is on Mersana Therapeutics' Insider Roster? The list of insiders at Mersana Therapeutics includes Alejandra Carvajal, Anna Protopapas, Arvin Yang, Ashish Mandelia, Brian Deschuytner, Martin H Jr. Huber, Mohan Bala, Timothy B Lowinger, and Tushar Misra. Learn more on insiders at MRSN. What percentage of Mersana Therapeutics stock is owned by insiders? 13.00% of Mersana Therapeutics stock is owned by insiders. Learn more on MRSN's insider holdings. Which Mersana Therapeutics insiders have been selling company stock? The following insiders have sold MRSN shares in the last 24 months: Alejandra Carvajal ($10,927.00), Anna Protopapas ($92,215.25), Ashish Mandelia ($26,036.75), Brian Deschuytner ($41,420.75), Martin H Jr. Huber ($91,314.00), Mohan Bala ($5,709.50), Timothy B Lowinger ($6,948.00), and Tushar Misra ($9,078.50). How much insider selling is happening at Mersana Therapeutics? Insiders have sold a total of 6,418 Mersana Therapeutics shares in the last 24 months for a total of $283,649.75 sold. Mersana Therapeutics Key ExecutivesDr. Martin H. Huber M.D. (Age 63)President, CEO & Director Compensation: $44kMr. Brian C. DeSchuytner (Age 45)Senior VP, CFO & COO Compensation: $626.32kDr. Timothy B. Lowinger Ph.D. (Age 60)Senior VP and Chief Science & Technology Officer Compensation: $666.3kMs. Alejandra Veronica Carvajal J.D. (Age 50)Senior VP, Secretary & Chief Legal Officer Compensation: $606.51kMr. Mikhail Papisov Ph.D.Co-FounderMr. Ashish Mandelia (Age 49)VP, Controller & Chief Accounting Officer Mr. Jason FredetteSenior Vice President of Investor Relations & Corporate CommunicationsMr. Chuck MillerSenior Vice President of Regulatory AffairsMr. Marc DamelinExe. Director and Head of Biology, Oncology, Antibody-Drug Conjugate ADC Discovery & Develop.Dr. Tushar Misra Ph.D. (Age 63)Senior VP & Chief Manufacturing Officer Compensation: $485.89k More Insider Trading Tools from MarketBeat Related Companies CRDF Insider Trading CABA Insider Trading MIST Insider Trading ZNTL Insider Trading CHRS Insider Trading GNLX Insider Trading FBRX Insider Trading ALTS Insider Trading FATE Insider Trading SCLX Insider Trading Insider Tracking Tools CEO Purchases/Sales CFO Purchases/Sales Top Insider Buying Stocks Top Insider Selling Stocks Insider Trades Screener Insider Trades Newsletter Congressional Stock Trades Insider Trading By Country U.S. Insider Trading Activity Canadian Insider Trading Activity U.K. Insider Trading Activity Australia Insider Trading Activity Latest Articles Costco Faces Downgrades, Death Cross, Insider SellingReynolds Consumer Products Stock Price: Insiders Signal a BottomBuy, Sell, or Hold? Insiders Pile Into These 3 Healthcare StocksInsiders Trade Millions in NVIDIA-Linked Navitas, Hims, & Shift45 Stocks Insiders Are Selling That Analysts Say Buy This page (NASDAQ:MRSN) was last updated on 8/29/2025 by MarketBeat.com Staff From Our PartnersINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | SponsoredBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. Economist ...Goldco Precious Metals | SponsoredThis is my Christian duty“This land I will give to you…” — a 4,000-year-old line from Genesis may hold the key to unlocking a $150 tril...Paradigm Press | SponsoredAlex’s “Next Magnificent Seven” stocksThe original “Magnificent Seven” turned $7K into $1.18 million. 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