Generation Bio (GBIO) Stock Chart & Stock Price History $6.17 -0.18 (-2.83%) Closing price 04:00 PM EasternExtended Trading$6.17 +0.00 (+0.02%) As of 06:26 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 Generation Bio Stock Price Performance The Generation Bio (GBIO) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 75.80%, with a year-to-date return of -41.79%. In the past month, the stock has increased 31.28%, reflecting recent market activity. As of the latest close, Generation Bio traded at $6.35 with a market cap of $42.80 million and volume of 55,437 shares. Five years ago, the stock traded at a split-adjusted price of $272.90, representing a 97.74% decrease over that period. At the time, it had a market cap of $1.14 billion and a volume of 3,900 shares. Receive GBIO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Generation Bio 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 Performance-4.34%1 Month Performance+31.28%3 Month Performance+68.30%Year-To-Date Performance-41.79%1 Year Performance-75.80%5 Year Performance-97.74% GBIO Stock Chart for Thursday, August, 28, 2025 GBIO Chart by TradingView Generation Bio 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 Capitalization08/27/2025$6.13$6.35+3.59%$6.44$6.0555,437 shs$42.80 million08/26/2025$6.10$6.13+0.49%$6.21$5.91115,897 shs$41.29 million08/25/2025$6.45$6.10-5.43%$6.45$6.1064,640 shs$41.11 million08/22/2025$6.28$6.45+2.71%$6.55$6.2878,248 shs$43.47 million08/21/2025$6.25$6.28+0.48%$6.50$6.2150,533 shs$42.33 million08/20/2025$6.39$6.25-2.19%$6.34$5.94156,243 shs$42.09 million08/19/2025$6.63$6.39-3.62%$6.66$6.31134,162 shs$43.07 million08/18/2025$6.29$6.63+5.41%$6.81$6.19222,021 shs$44.69 million08/15/2025$6.66$6.29-5.56%$6.65$6.28188,256 shs$42.40 million08/14/2025$6.61$6.66+0.76%$6.68$5.75762,770 shs$44.89 million Get the Latest News and Ratings for GBIO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Generation Bio and its competitors with MarketBeat's FREE daily newsletter. 08/13/2025$4.05$6.61+63.21%$6.95$5.1510.00 million shs$44.55 million08/12/2025$4.04$4.05+0.25%$4.27$3.973.24 million shs$27.30 million08/11/2025$4.10$4.04-1.46%$4.34$3.96125,810 shs$27.23 million08/08/2025$4.15$4.10-1.20%$4.55$4.0458,515 shs$27.63 million08/07/2025$4.28$4.15-3.04%$4.29$4.1453,283 shs$27.82 million08/06/2025$4.56$4.28-6.14%$4.57$4.2827,857 shs$28.68 million08/05/2025$4.58$4.56-0.44%$4.83$4.4956,009 shs$30.55 million08/04/2025$4.21$4.58+8.79%$4.63$4.25106,370 shs$30.70 million08/01/2025$4.44$4.21-5.18%$4.40$4.11143,807 shs$28.22 million07/31/2025$4.51$4.44-1.55%$4.52$4.3379,601 shs$29.75 million07/30/2025$4.41$4.51+2.27%$4.64$4.2298,104 shs$30.22 million07/29/2025$4.70$4.41-6.17%$4.90$4.28145,660 shs$29.56 million07/28/2025$4.61$4.70+1.95%$5.10$4.61195,852 shs$31.49 million Related Companies ACTU Stock Price Chart CRBU Stock Price Chart TVGN Stock Price Chart CYBN Stock Price Chart MCRB Stock Price Chart NKTX Stock Price Chart KYTX Stock Price Chart BDTX Stock Price Chart GLSI Stock Price Chart BIOA Stock Price Chart Receive GBIO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Generation Bio and its competitors with MarketBeat's FREE daily newsletter. 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