Generation Bio (GBIO) Short Interest Ratio & Short Volume $6.11 -0.20 (-3.17%) Closing price 04:00 PM EasternExtended Trading$6.12 +0.00 (+0.08%) As of 04:10 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 Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Generation Bio Short Interest DataGeneration Bio (GBIO) has a short interest of 152,400 shares, representing 3.30% of the float (the number of shares available for trading by the public). This marks a -21.97% decrease in short interest from the previous month. The short interest ratio (days to cover) is 0.4, indicating that it would take 0.4 days of the average trading volume of 151,986 shares to cover all short positions.Current Short Interest152,400 sharesPrevious Short Interest195,300 sharesChange Vs. Previous Month-21.97%Dollar Volume Sold Short$851.92 thousandShort Interest Ratio0.4 Days to CoverLast Record DateSeptember 15, 2025Outstanding Shares6,735,000 sharesFloat Size4,620,000 sharesShort Percent of Float3.30%Today's Trading Volume29,205 sharesAverage Trading Volume151,986 sharesToday's Volume Vs. Average19% Short Selling Generation Bio? Sign up to receive the latest short interest report for Generation Bio and its competitors with MarketBeat's FREE newsletter. Email Address Get Report 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. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartGBIO Short Interest Over TimeGBIO Days to Cover Over TimeGBIO Percentage of Float Shorted Over Time Generation Bio Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 9/15/2025152,400 shares $851.92 thousand -22.0%3.3%0.4 $5.59 8/31/2025195,300 shares $1.17 million -32.8%4.2%0.6 $6.00 8/15/2025290,800 shares $1.83 million +195.5%6.3%0.8 $6.29 7/31/202598,400 shares $436.90 thousand +20.7%2.2%0.8 $4.44 7/15/202581,500 shares $347.19 thousand -89.4%1.8%0.7 $4.26 6/30/2025767,000 shares $245.52 thousand -59.2%1.7%1.1 $0.32 6/15/20251,880,000 shares $693.91 thousand +72.5%4.1%3.6 $0.37 5/31/20251,090,000 shares $407.77 thousand -42.3%2.4%2.1 $0.37 5/15/20251,890,000 shares $709.88 thousand +67.3%4.1%3.9 $0.38 4/30/20251,130,000 shares $489.40 thousand -32.3%2.5%2.3 $0.43 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. 4/15/20251,670,000 shares $614.23 thousand -1.2%3.7%3.5 $0.37 3/31/20251,690,000 shares $684.45 thousand +0.6%3.7%3.2 $0.41 3/15/20251,680,000 shares $806.40 thousand -34.4%3.7%3.1 $0.48 2/28/20252,560,000 shares $1.48 million +2.4%5.6%5 $0.58 2/15/20252,500,000 shares $1.70 million +8.7%5.5%5.2 $0.68 1/31/20252,300,000 shares $1.79 million +6.5%5.0%5.1 $0.78 1/15/20252,160,000 shares $1.92 million +22.7%5.1%5.6 $0.89 12/31/20241,760,000 shares $1.87 million -1.1%4.1%6.1 $1.06 12/15/20241,780,000 shares $2.06 million +16.3%4.2%8 $1.16 11/30/20241,530,000 shares $2.33 million +3.4%3.3%10.3 $1.52 11/15/20241,480,000 shares $2.28 million -10.8%3.2%11.4 $1.54 10/31/20241,660,000 shares $3.62 million -4.6%3.4%15.2 $2.18 10/15/20241,740,000 shares $4.21 million -13.4%3.6%17.1 $2.42 9/30/20242,010,000 shares $4.96 million -6.1%4.1%19.2 $2.47 9/15/20242,140,000 shares $5.56 million +13.8%4.4%18.3 $2.60 8/31/20241,880,000 shares $4.96 million No Change3.9%15.5 $2.64 8/15/20241,880,000 shares $4.96 million +2.7%3.9%15.5 $2.64 7/31/20241,830,000 shares $6.11 million -4.2%3.8%13.3 $3.34 7/15/20241,910,000 shares $5.60 million +13.7%3.9%12 $2.93 6/30/20241,680,000 shares $4.74 million +10.5%3.5%9.7 $2.82 6/15/20241,520,000 shares $4.16 million -1.3%3.1%8.1 $2.74 5/31/20241,540,000 shares $4.90 million -4.9%3.2%7.5 $3.18 5/15/20241,620,000 shares $6.14 million -7.4%3.3%6.9 $3.79 4/30/20241,750,000 shares $4.95 million +10.8%3.6%7.2 $2.83 4/15/20241,580,000 shares $5.85 million +38.6%3.3%6.5 $3.70 3/31/20241,140,000 shares $4.64 million -10.2%2.4%4.2 $4.07 3/15/20241,270,000 shares $3.92 million -11.8%2.6%3.9 $3.09 2/29/20241,440,000 shares $3.61 million +0.7%3.0%3.5 $2.51 2/15/20241,430,000 shares $2.96 million -1.4%3.0%3 $2.07 1/31/20241,450,000 shares $2.73 million +16.0%3.0%2.5 $1.88 1/15/20241,250,000 shares $2.39 million +23.8%2.6%1.5 $1.91 12/31/20231,010,000 shares $1.67 million -25.2%2.1%1.2 $1.65 12/15/20231,350,000 shares $2.70 million -33.2%2.8%1.7 $2.00 11/30/20232,020,000 shares $2.28 million -34.6%4.2%2.9 $1.13 11/15/20233,090,000 shares $3.65 million +76.6%6.3%5.4 $1.18 10/31/20231,750,000 shares $1.64 million -3.3%3.6%3.8 $0.94 10/15/20231,810,000 shares $5.86 million +0.6%3.7%6.4 $3.24 9/30/20231,800,000 shares $6.82 million -12.2%3.7%14.7 $3.79 9/15/20232,050,000 shares $8.41 million +3.0%4.2%15.6 $4.10 8/31/20231,990,000 shares $9.51 million +2.6%4.1%13.2 $4.78 8/15/20231,940,000 shares $8.77 million -2.0%4.0%12 $4.52 7/31/20231,980,000 shares $10.06 million -2.9%4.1%11.7 $5.08 7/15/20232,040,000 shares $10.36 million +2.5%4.2%11.7 $5.08 6/30/20231,990,000 shares $10.95 million -8.3%4.1%10.9 $5.50 6/15/20232,170,000 shares $10.76 million -3.6%4.5%9.2 $4.96 5/31/20232,250,000 shares $7.88 million +6.6%4.8%5.1 $3.50 5/15/20232,110,000 shares $9.90 million -1.9%4.5%4.6 $4.69 4/30/20232,150,000 shares $10.58 million +4.9%4.6%4.6 $4.92 4/15/20232,050,000 shares $9.23 million -8.1%4.8%4.2 $4.50 3/31/20232,230,000 shares $9.59 million +55.9%5.1%4.6 $4.30 3/15/20231,430,000 shares $5.16 million +10.0%3.0%3.1 $3.61 2/28/20231,300,000 shares $5.15 million +0.8%2.7%5.8 $3.96 2/15/20231,290,000 shares $7.19 million -9.2%2.7%6.2 $5.57 1/31/20231,420,000 shares $8.38 million -3.4%3.0%7 $5.90 1/15/20231,470,000 shares $7.50 million -12.0%3.1%8 $5.10 12/30/20221,670,000 shares $6.56 million -19.3%3.5%9.1 $3.93 12/15/20222,070,000 shares $9.40 million -1.9%4.3%12.1 $4.54 11/30/20222,110,000 shares $11.25 million -14.2%4.4%11.8 $5.33 11/15/20222,460,000 shares $15.55 million -0.8%5.1%13.4 $6.32 10/31/20222,480,000 shares $12.70 million -6.4%5.2%11.2 $5.12 10/15/20222,650,000 shares $14.87 million -0.4%5.6%9.8 $5.61 9/30/20222,660,000 shares $14.12 million +5.1%5.6%8.9 $5.31 9/15/20222,530,000 shares $13.79 million -1.6%5.3%7.6 $5.45 8/31/20222,570,000 shares $13.16 million +0.8%5.4%6.8 $5.12 8/15/20222,550,000 shares $20.20 million -5.6%5.4%6.8 $7.92 7/31/20222,700,000 shares $17.23 million -2.5%5.9%7.3 $6.38 7/15/20222,770,000 shares $19.89 million -1.1%6.1%7.6 $7.18 6/30/20222,800,000 shares $18.37 million -11.7%6.1%7.5 $6.56 6/15/20223,170,000 shares $18.51 million -3.9%7.0%7.9 $5.84 5/31/20223,300,000 shares $18.55 million -1.8%7.2%8.1 $5.62 5/15/20223,360,000 shares $20.16 million -24.3%7.4%7.8 $6.00 4/30/20224,440,000 shares $28.11 million +6.0%9.5%9.8 $6.33 4/15/20224,190,000 shares $39.43 million +4.2%9.0%9.3 $9.41 3/31/20224,020,000 shares $29.51 million -13.7%8.6%8.1 $7.34 3/15/20224,660,000 shares $21.20 million +4.7%10.0%9.2 $4.55 2/28/20224,450,000 shares $22.78 million -0.5%9.5%7.5 $5.12 2/15/20224,470,000 shares $22.08 million +2.5%9.6%7.6 $4.94 1/31/20224,360,000 shares $28.34 million +9.0%9.6%8.2 $6.50 1/15/20224,000,000 shares $27.88 million +7.0%8.8%8.1 $6.97 12/31/20213,740,000 shares $26.48 million -33.7%8.2%8.4 $7.08 12/15/20215,640,000 shares $36.66 million -3.6%12.4%14.5 $6.50 11/30/20215,850,000 shares $100.44 million -1.5%12.9%23.9 $17.17 11/15/20215,940,000 shares $121.77 million -1.0%13.1%24.4 $20.50 10/29/20216,000,000 shares $125.76 million -1.2%13.2%22.7 $20.96 10/15/20216,070,000 shares $132.39 million +1.3%13.4%21.6 $21.81 9/30/20215,990,000 shares $150.17 million -6.3%13.2%20.3 $25.07 9/15/20216,390,000 shares $169.97 million -6.2%14.1%20.7 $26.60 8/31/20216,810,000 shares $170.25 million +1.6%15.2%22.2 $25.00 8/13/20216,700,000 shares $151.22 million +1.8%14.9%20.1 $22.57 7/30/20216,580,000 shares $143.05 million +7.5%14.7%19.7 $21.74 7/15/20216,120,000 shares $122.40 million +5.3%13.7%18.1 $20.00 6/30/20215,810,000 shares $156.29 million +5.1%13.0%15.9 $26.90 6/15/20215,530,000 shares $147.93 million +25.7%12.8%13.6 $26.75 5/28/20214,400,000 shares $150.74 million -5.6%10.2%9.4 $34.26 5/14/20214,660,000 shares $144.23 million +2.6%10.8%10.1 $30.95 4/30/20214,540,000 shares $170.98 million +2.7%11.4%9.6 $37.66 4/15/20214,420,000 shares $117.48 million +5.0%11.2%8.7 $26.58 3/31/20214,210,000 shares $111.94 million +159.9%10.7%6.2 $26.59 3/15/20211,620,000 shares $56.30 million +2.5%4.2%2.4 $34.75 2/26/20211,580,000 shares $54.48 million No Change4.3%2.7 $34.48 2/12/20211,580,000 shares $55.63 million -3.1%4.3%2.9 $35.21 1/29/20211,630,000 shares $42.38 million -36.8%4.9%3.1 $26.00 1/15/20212,580,000 shares $89.99 million No Change7.7%5.4 $34.88 GBIO Short Interest - Frequently Asked Questions What is Generation Bio's current short interest? Short interest is the volume of Generation Bio shares that have been sold short but have not yet been closed out or covered. As of September 15th, traders have sold 152,400 shares of GBIO short. 3.30% of Generation Bio's shares are currently sold short. Learn More on Generation Bio's current short interest. What is a good short interest percentage for Generation Bio? Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 3.30% of Generation Bio's floating shares are currently sold short. Is Generation Bio's short interest increasing or decreasing? Generation Bio saw a decrease in short interest in the month of September. As of September 15th, there was short interest totaling 152,400 shares, a decrease of 22.0% from the previous total of 195,300 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment. What is Generation Bio's float size? Generation Bio currently has issued a total of 6,735,000 shares. Some of Generation Bio's outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. Generation Bio currently has a public float of 4,620,000 shares. How does Generation Bio's short interest compare to its competitors? 3.30% of Generation Bio's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Generation Bio: Eledon Pharmaceuticals, Inc. (9.07%), Actuate Therapeutics, Inc. (8.00%), C4 Therapeutics, Inc. (4.97%), Genelux Corporation (6.71%), Theratechnologies Inc. (0.51%), Citius Oncology, Inc. (1.23%), Zura Bio Limited (1.12%), Tevogen Bio Holdings Inc. (4.91%), Molecular Partners AG Sponsored ADR (0.08%), Nuvectis Pharma, Inc. (6.17%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: AppLovin Corporation ($8.81 billion), Canadian Natural Resources Limited ($5.82 billion), Reddit Inc. ($5.19 billion), Coinbase Global, Inc. ($4.52 billion), Robinhood Markets, Inc. ($4.30 billion), Charter Communications, Inc. ($3.75 billion), CoreWeave Inc. ($3.66 billion), Seagate Technology Holdings PLC ($3.57 billion), Live Nation Entertainment, Inc. ($3.33 billion), and Rocket Lab Corporation ($3.26 billion). View all of the most shorted stocks. What does it mean to sell short Generation Bio stock? Short selling GBIO is an investing strategy that aims to generate trading profit from Generation Bio as its price is falling. GBIO shares are trading down $0.18 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit. How does a short squeeze work against Generation Bio? A short squeeze for Generation Bio occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of GBIO, which in turn drives the price of the stock up even further. How often is Generation Bio's short interest reported? Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including GBIO, twice per month. The most recent reporting period available is September, 15 2025. More Short Interest Resources from MarketBeat Related Companies ELDN Short Interest Data ACTU Short Interest Data CCCC Short Interest Data GNLX Short Interest Data THTX Short Interest Data CTOR Short Interest Data ZURA Short Interest Data TVGN Short Interest Data MOLN Short Interest Data NVCT Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:GBIO) was last updated on 10/10/2025 by MarketBeat.com Staff From Our PartnersURGENT: The Market's 3 Red Flags Are FlashingHere’s the uncomfortable truth: The smartest investors in the world are already preparing for a crash befor...StockEarnings | SponsoredU.S. Government Sparking Crypto RallyAltcoin ETFs could surge prices (do this now) My "Crypto Bull Run Millionaire Blueprint" breaks down exactl...Crypto 101 Media | Sponsored$15 Fund: Turn Gold Boom into Real IncomeIf you've been watching gold's historic run and wondering if it's too late… I've got good news. 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