Y-mAbs Therapeutics (YMAB) Stock Chart & Stock Price History $8.58 -0.01 (-0.12%) Closing price 09/9/2025 04:00 PM EasternExtended Trading$8.58 0.00 (0.00%) As of 09/9/2025 06:51 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 InterestTrendsBuy This Stock Y-mAbs Therapeutics Stock Price Performance The Y-mAbs Therapeutics (YMAB) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 35.97%, with a year-to-date return of 9.58%. In the past month, the stock has increased 0.82%, reflecting recent market activity. As of the latest close, Y-mAbs Therapeutics traded at $8.58 with a market cap of $389.88 million and volume of 298,459 shares. Five years ago, the stock traded at $39.60, representing a 78.33% decrease over that period. At the time, it had a market cap of $1.63 billion and a volume of 102,363 shares. Receive YMAB Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Y-mAbs Therapeutics 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 Performance0.00%1 Month Performance+0.82%3 Month Performance+67.91%Year-To-Date Performance+9.58%1 Year Performance-35.97%5 Year Performance-78.33% YMAB Stock Chart for Wednesday, September, 10, 2025 YMAB Chart by TradingView Y-mAbs 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 Capitalization09/09/2025$8.59$8.58-0.12%$8.59$8.58298,459 shs$389.88 million09/08/2025$8.58$8.59+0.12%$8.59$8.58460,520 shs$390.33 million09/05/2025$8.57$8.58+0.12%$8.59$8.56454,884 shs$389.88 million09/04/2025$8.58$8.57-0.12%$8.58$8.56522,282 shs$389.42 million09/03/2025$8.56$8.58+0.23%$8.58$8.561.81 million shs$389.88 million09/02/2025$8.55$8.56+0.12%$8.57$8.55548,627 shs$388.97 million09/01/2025$8.55$8.55$8.55$8.54398,287 shs$388.51 million08/29/2025$8.54$8.55+0.12%$8.55$8.54398,287 shs$388.51 million08/28/2025$8.55$8.54-0.12%$8.55$8.541.88 million shs$388.50 million08/27/2025$8.54$8.55+0.12%$8.56$8.531.02 million shs$388.51 million Get the Latest News and Ratings for YMAB and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Y-mAbs Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 08/26/2025$8.52$8.54+0.23%$8.54$8.521.00 million shs$388.06 million08/25/2025$8.53$8.52-0.12%$8.54$8.52799,398 shs$387.13 million08/22/2025$8.53$8.53$8.54$8.53573,836 shs$387.59 million08/21/2025$8.52$8.53+0.12%$8.54$8.52551,972 shs$387.60 million08/20/2025$8.52$8.52$8.53$8.52890,084 shs$387.15 million08/19/2025$8.52$8.52$8.53$8.52943,986 shs$387.13 million08/18/2025$8.52$8.52$8.54$8.513.02 million shs$387.15 million08/15/2025$8.51$8.52+0.12%$8.53$8.511.10 million shs$387.15 million08/14/2025$8.51$8.51$8.53$8.511.31 million shs$386.69 million08/13/2025$8.51$8.51$8.52$8.51653,013 shs$386.68 million08/12/2025$8.52$8.51-0.12%$8.53$8.511.13 million shs$385.33 million08/11/2025$8.51$8.52+0.12%$8.53$8.51998,991 shs$385.79 million Related Companies ARDX Stock Chart WVE Stock Chart TLRY Stock Chart EWTX Stock Chart PAHC Stock Chart HROW Stock Chart SDGR Stock Chart AVDL Stock Chart AMPH Stock Chart SNDX Stock Chart Receive YMAB Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Y-mAbs Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 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