Generation Bio (GBIO) Stock Chart & Stock Price History $6.45 +0.17 (+2.71%) Closing price 08/22/2025 04:00 PM EasternExtended Trading$6.54 +0.09 (+1.32%) As of 08/22/2025 07:17 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 75.66%, with a year-to-date return of -39.15%. In the past month, the stock has increased 48.96%, reflecting recent market activity. As of the latest close, Generation Bio traded at $6.45 with a market cap of $43.47 million and volume of 78,248 shares. Five years ago, the stock traded at a split-adjusted price of $244.40, representing a 97.36% decrease over that period. At the time, it had a market cap of $1.11 billion and a volume of 8,557 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. Email Address 5 Day Performance-2.71%1 Month Performance+48.96%3 Month Performance+74.28%Year-To-Date Performance-39.15%1 Year Performance-75.66%5 Year Performance-97.36% GBIO Stock Chart for Saturday, August, 23, 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 Capitalization08/22/2025$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 million08/13/2025$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 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. 08/08/2025$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 million07/25/2025$4.20$4.61+9.76%$4.80$4.15179,814 shs$30.89 million07/24/2025$4.33$4.20-3.00%$4.61$4.05359,980 shs$28.14 million07/23/2025$4.27$4.33+1.41%$5.00$4.14273,104 shs$290.26 million07/22/2025$4.21$4.27+1.43%$4.44$3.88282,142 shs$286.26 million Related Companies CYBN Stock Price Chart ACTU Stock Price Chart NKTX Stock Price Chart NVCT Stock Price Chart BIOA Stock Price Chart GLSI Stock Price Chart CRDF Stock Price Chart DERM Stock Price Chart CLLS Stock Price Chart MEIP 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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