Generation Bio (GBIO) Short Interest Ratio & Short Volume $0.38 -0.01 (-3.38%) Closing price 04:00 PM EasternExtended Trading$0.40 +0.02 (+5.29%) As of 06:00 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 ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Generation Bio Short Interest DataGeneration Bio (GBIO) has a short interest of 1.13 million shares, representing 2.47% of the float (the number of shares available for trading by the public). This marks a -32.34% decrease in short interest from the previous month. The short interest ratio (days to cover) is 2.3, indicating that it would take 2.3 days of the average trading volume of 304,224 shares to cover all short positions.Current Short Interest1,130,000 sharesPrevious Short Interest1,670,000 sharesChange Vs. Previous Month-32.34%Dollar Volume Sold Short$489,403.00Short Interest Ratio2.3 Days to CoverLast Record DateApril 30, 2025Outstanding Shares67,035,000 sharesFloat Size45,800,000 sharesShort Percent of Float2.47%Today's Trading Volume176,401 sharesAverage Trading Volume304,224 sharesToday's Volume Vs. Average58% 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 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 4/30/20251,130,000 shares $489,403.00 -32.3%2.5%2.3 $0.43 4/15/20251,670,000 shares $614,226.00 -1.2%3.7%3.5 $0.37 3/31/20251,690,000 shares $684,450.00 +0.6%3.7%3.2 $0.41 3/15/20251,680,000 shares $806,400.00 -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 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. 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 $4.10I was wrong. Dead wrong. (Ad)I thought what happened 25 years ago was a once- in-a-lifetime event… but how wrong I was. Because here we are, a quarter of a century later, almost to the exact day, and it’s happening again. Here’s the full story for you. 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 $22.57I was wrong. Dead wrong. (Ad)I thought what happened 25 years ago was a once- in-a-lifetime event… but how wrong I was. Because here we are, a quarter of a century later, almost to the exact day, and it’s happening again. Here’s the full story for you. 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 April 30th, investors have sold 1,130,000 shares of GBIO short. 2.47% of Generation Bio's shares are currently sold short. Learn More on Generation Bio's current short interest. What is a good short interest ratio for Generation Bio? The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. GBIO shares currently have a short interest ratio of 2.0. Learn More on Generation Bio's short interest ratio. 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. 2.47% of Generation Bio's floating shares are currently sold short. Is Generation Bio's short interest increasing or decreasing? Generation Bio saw a decline in short interest in the month of April. As of April 30th, there was short interest totaling 1,130,000 shares, a decline of 32.3% from the previous total of 1,670,000 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 67,035,000 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 45,800,000 shares. How does Generation Bio's short interest compare to its competitors? 2.47% 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: Coya Therapeutics, Inc. (1.90%), Sagimet Biosciences Inc. (16.72%), Invivyd, Inc. (9.93%), MacroGenics, Inc. (9.79%), Black Diamond Therapeutics, Inc. (16.60%), Contineum Therapeutics, Inc. (4.28%), Entera Bio Ltd. (0.31%), Kyverna Therapeutics, Inc. (10.90%), OptiNose, Inc. (1.68%), HilleVax, Inc. (8.13%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Spotify Technology S.A. ($4.67 billion), Charter Communications, Inc. ($4.58 billion), Capital One Financial Co. ($4.47 billion), The Kroger Co. ($2.56 billion), Reddit, Inc. ($2.23 billion), Rivian Automotive, Inc. ($2.16 billion), Live Nation Entertainment, Inc. ($1.90 billion), SoFi Technologies, Inc. ($1.85 billion), Zscaler, Inc. ($1.75 billion), and Omnicom Group Inc. ($1.75 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 up $0.00 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 April, 30 2025. More Short Interest Resources from MarketBeat Related Companies COYA Short Interest Data SGMT Short Interest Data IVVD Short Interest Data MGNX Short Interest Data BDTX Short Interest Data CTNM Short Interest Data ENTX Short Interest Data KYTX Short Interest Data OPTN Short Interest Data HLVX 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 5/22/2025 by MarketBeat.com Staff From Our PartnersWatch This Robotics Demo Before July 23rdJeff Brown, the tech legend who picked shares of Nvidia in 2016 before they jumped by more than 22,000%... ...Brownstone Research | SponsoredWhite House to reset Social Security?Elon Musk's parting DOGE gift looks set to shock America... 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