Generation Bio (GBIO) Short Interest Ratio & Short Volume $4.21 -0.23 (-5.18%) Closing price 08/1/2025 04:00 PM EasternExtended Trading$4.22 +0.00 (+0.12%) As of 08/1/2025 06:28 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 81,500 shares, representing 1.78% of the float (the number of shares available for trading by the public). This marks a -89.37% decrease in short interest from the previous month. The short interest ratio (days to cover) is 0.7, indicating that it would take 0.7 days of the average trading volume of 207,966 shares to cover all short positions.Current Short Interest81,500 sharesPrevious Short Interest767,000 sharesChange Vs. Previous Month-89.37%Dollar Volume Sold Short$347.19 thousandShort Interest Ratio0.7 Days to CoverLast Record DateJuly 15, 2025Outstanding Shares6,700,000 sharesFloat Size4,580,000 sharesShort Percent of Float1.78%Today's Trading Volume143,807 sharesAverage Trading Volume207,966 sharesToday's Volume Vs. Average69% 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 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 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 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. 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 $1.13Market Panic: Trump Just Dropped a Bomb on Your Stocks (Ad)tock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tariffs just lit the fuse. Millions of investors are blindsided as stocks plunge… but this is only Phase 1. If you're still holding the wrong assets, you could lose 30% or more in the coming weeks.Don't wait for the next drop to wipe you out. Get the FREE Guide Before Markets Open Tomorrow 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 $20.96Market Panic: Trump Just Dropped a Bomb on Your Stocks (Ad)tock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tariffs just lit the fuse. Millions of investors are blindsided as stocks plunge… but this is only Phase 1. If you're still holding the wrong assets, you could lose 30% or more in the coming weeks.Don't wait for the next drop to wipe you out. Get the FREE Guide Before Markets Open Tomorrow 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 covered or closed out. As of July 15th, traders have sold 81,500 shares of GBIO short. 1.78% 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 1.0. 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. 1.78% 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 July. As of July 15th, there was short interest totaling 81,500 shares, a decline of 89.4% from the previous total of 767,000 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 6,700,000 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 4,580,000 shares. How does Generation Bio's short interest compare to its competitors? 1.78% 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: ALT5 Sigma Corporation (6.62%), Connect Biopharma Holdings Limited Sponsored ADR (0.11%), FitLife Brands Inc. (1.18%), Skye Bioscience, Inc. (15.01%), Coherus Oncology, Inc. (26.94%), Protalix BioTherapeutics, Inc. (4.18%), Cardiol Therapeutics Inc. (2.19%), Cassava Sciences, Inc. (13.00%), Corbus Pharmaceuticals Holdings, Inc. (12.80%), Zura Bio Limited (1.52%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Coinbase Global, Inc. ($5.11 billion), Charter Communications, Inc. ($4.76 billion), Reddit Inc. ($2.84 billion), SoFi Technologies, Inc. ($2.79 billion), Seagate Technology Holdings PLC ($2.79 billion), Live Nation Entertainment, Inc. ($2.67 billion), Rocket Lab Corporation ($2.49 billion), AST SpaceMobile, Inc. ($2.12 billion), Moderna, Inc. ($2.09 billion), and Omnicom Group Inc. ($2.04 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 $0.23 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 increases 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 July, 15 2025. More Short Interest Resources from MarketBeat Related Companies ALTS Short Interest Data CNTB Short Interest Data FTLF Short Interest Data SKYE Short Interest Data CHRS Short Interest Data PLX Short Interest Data CRDL Short Interest Data SAVA Short Interest Data CRBP Short Interest Data ZURA 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 8/2/2025 by MarketBeat.com Staff From Our PartnersMicrosoft's Next Big Bet?Microsoft just broke ground on a revolutionary power system that could deliver virtually limitless, carbon-fre...Stansberry Research | SponsoredI warned you about Nvidia… now look what’s happeningNvidia just got Trump’s greenlight to sell high-powered AI chips to China — and their stock surged 5% before t...Timothy Sykes | SponsoredTrump set to Boost Social Security Checks by 400%?If you're collecting or planning to collect social security... You should see this presentation about Presi...InvestorPlace | Sponsored$100 Trillion “AI Metal” Found in American Ghost TownJeff Brown recently traveled to a ghost town in the middle of an American desert… To investigate what could...Brownstone Research | SponsoredHIDDEN IN THE BOOK OF GENESIS…“This land I will give to you…” — a 4,000-year-old line from Genesis may hold the key to unlocking a $150 tril...Paradigm Press | SponsoredHe Called Nvidia at $1.10. Now, He Says THIS Stock Will…The original Magnificent Seven returned 16,894%—turning $7K into $1.18 million. Now, the man who called Nvi...The Oxford Club | SponsoredDigital Dollar Alert: Protect Your Wealth Before It’s Too Late134 countries are developing Central Bank Digital Currencies — and the U.S. is quietly testing one. Experts...American Alternative | SponsoredAlien rocks potentially worth trillions…It might look like just a weird rock—but it’s tied to a discovery 60 Minutes says could be worth up to $16 tri...Porter & Company | Sponsored Adding Choose a watchlist: Watchlist Adding You have already added ten stocks to your watchlist. Upgrade to MarketBeat All Access to add more stocks to your watchlist. Adding Generation Bio Co. Please log in to your account or sign up in order to add this asset to your watchlist. Share Generation Bio With A Colleague Link copied to clipboard. Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. Real-time analyst ratings, insider transactions, earnings data, and more. Our daily ratings and market update email newsletter. Sign in to your free account to enjoy all that MarketBeat has to offer. Sign In Create Account Your Email Address: Email Address Required Your Password: Password Required Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Please enter your email address. Please enter a valid email address Choose a Password: Please enter your password. Your password must be at least 8 characters long and contain at least 1 number, 1 letter, and 1 special character. Create My Account (Free) or Sign in with Facebook Sign in with Google By creating a free account, you agree to our terms of service. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.