bluebird bio (BLUE) Short Interest Ratio & Short Volume $4.97 0.00 (0.00%) As of 06/2/2025 Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock bluebird bio Short Interest Databluebird bio (BLUE) has a short interest of 281,500 shares, representing 2.91% of the float (the number of shares available for trading by the public). This marks a -34.26% decrease in short interest from the previous month. The short interest ratio (days to cover) is 0.5, indicating that it would take 0.5 days of the average trading volume of 437,173 shares to cover all short positions.Current Short Interest281,500 sharesPrevious Short Interest428,200 sharesChange Vs. Previous Month-34.26%Dollar Volume Sold Short$1.40 millionShort Interest Ratio0.5 Days to CoverLast Record DateMay 15, 2025Outstanding Shares9,792,000 sharesFloat Size9,690,000 sharesShort Percent of Float2.91%Today's Trading Volume0 sharesAverage Trading Volume437,173 sharesToday's Volume Vs. Average0% Short Selling bluebird bio? Sign up to receive the latest short interest report for bluebird 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 ChartBLUE Short Interest Over TimeBLUE Days to Cover Over TimeBLUE Percentage of Float Shorted Over Time bluebird 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 5/15/2025281,500 shares $1.40 million -34.3%2.9%0.5 $4.97 4/30/2025428,200 shares $1.75 million -15.6%4.4%1.1 $4.08 4/15/2025507,400 shares $2.27 million -71.5%5.2%1.2 $4.47 3/31/20251,780,000 shares $8.69 million -3.8%18.4%4.3 $4.88 3/15/20251,850,000 shares $6.94 million -7.0%19.2%5.2 $3.75 2/28/20251,990,000 shares $8.12 million -26.8%20.6%4.2 $4.08 2/15/20252,720,000 shares $19.77 million +7.5%28.3%5.6 $7.27 1/31/20252,530,000 shares $19.61 million +4.6%26.3%6.3 $7.75 1/15/20252,420,000 shares $20.06 million +0.4%25.1%6.1 $8.29 12/31/20242,410,000 shares $20.10 million -6.6%25.0%5.9 $8.34 Get the Latest News and Ratings for BLUE and Related StocksEnter your email address below to receive the latest news and analysts' ratings for bluebird bio and its competitors with MarketBeat's FREE daily newsletter. 12/15/20242,580,000 shares $16.36 million -94.8%26.8%6.2 $6.34 11/30/202449,570,000 shares $20.08 million +13.6%N/A6.5 $0.41 11/15/202443,640,000 shares $14.00 million -8.5%N/A6.7 $0.32 10/31/202447,710,000 shares $22.14 million -3.5%N/A6.3 $0.46 10/15/202449,420,000 shares $23.78 million +0.9%N/A6.8 $0.48 9/30/202448,990,000 shares $25.45 million +1.2%N/A6.4 $0.52 9/15/202448,400,000 shares $29.32 million -2.0%N/A6.5 $0.61 8/31/202449,370,000 shares $27.72 million +20.0%N/A6.8 $0.56 8/15/202441,140,000 shares $29.02 million +32.2%N/A6.1 $0.71 7/31/202431,130,000 shares $36.11 million +1.2%N/A5.6 $1.16 7/15/202430,770,000 shares $40.62 million +0.2%N/A5 $1.32 6/30/202430,710,000 shares $30.22 million +4.2%N/A4.9 $0.98 6/15/202429,480,000 shares $28.29 million +1.2%N/A4.7 $0.96 5/31/202429,120,000 shares $26.31 million -7.9%N/A4.5 $0.90 5/15/202431,600,000 shares $33.81 million -0.8%N/A4 $1.07 4/30/202431,860,000 shares $28.26 million -2.3%N/A3.8 $0.89 4/15/202432,620,000 shares $33.60 million +9.7%N/A3.8 $1.03 3/31/202429,750,000 shares $38.08 million -12.6%N/A3.3 $1.28 3/15/202434,040,000 shares $48.34 million -0.3%N/A3.2 $1.42 2/29/202434,130,000 shares $47.44 million +19.4%N/A2.4 $1.39 2/15/202428,590,000 shares $30.88 million +4.0%N/A2.2 $1.08 1/31/202427,500,000 shares $28.05 million +3.5%N/A2.3 $1.02 1/15/202426,570,000 shares $39.86 million +10.3%N/A2.4 $1.50 12/31/202324,090,000 shares $33.24 million -5.4%N/A2.4 $1.38 12/15/202325,470,000 shares $83.29 million +16.6%N/A2.8 $3.27 11/30/202321,850,000 shares $83.47 million -2.9%N/A4.7 $3.82 11/15/202322,490,000 shares $73.99 million -8.5%N/A6.4 $3.29 10/31/202324,570,000 shares $72.48 million -0.4%N/A7 $2.95 10/15/202324,670,000 shares $65.62 million +2.3%N/A7 $2.66 9/30/202324,110,000 shares $73.29 million -17.0%N/A5.8 $3.04Utah’s New Oil Find (Ad)The Real Reason 218,000 Acres Just Vanished The government just quietly leased 218,000 acres in the middle of the Utah's Black Desert. Why? Not for oil discovery. Or uranium or solar. Instead, what’s happening beneath this patch of sand is the discovery of a new kind of energy. Google, Buffett, and a even tech billionaires like Gates, Bezos, and Zuckerberg are grabbing a stake.Find out why this could be the most lucrative "underground" energy story in America 9/15/202329,040,000 shares $97.28 million +11.5%N/A7 $3.35 8/31/202326,040,000 shares $98.17 million -1.6%N/A6.3 $3.77 8/15/202326,450,000 shares $95.75 million -8.3%N/A6.2 $3.62 7/31/202328,840,000 shares $113.34 million +13.7%N/A6.6 $3.93 7/15/202325,360,000 shares $76.84 million -21.5%N/A5.8 $3.03 6/30/202332,300,000 shares $106.27 million +6.1%N/A8.1 $3.29 6/15/202330,440,000 shares $121.46 million +23.0%N/A6.8 $3.99 5/31/202324,740,000 shares $82.88 million +5.3%N/A5.2 $3.35 5/15/202323,490,000 shares $96.78 million -0.3%N/A5 $4.12 4/30/202323,550,000 shares $102.44 million -0.8%N/A5.3 $4.35 4/15/202323,740,000 shares $74.07 million -10.3%N/A5.5 $3.12 3/31/202326,450,000 shares $84.11 million +29.0%N/A6.1 $3.18 3/15/202320,510,000 shares $95.37 million +12.2%N/A5.4 $4.65 2/28/202318,280,000 shares $95.06 million +5.5%N/A5.4 $5.20 2/15/202317,320,000 shares $102.88 million +0.2%N/A5.1 $5.94 1/31/202317,290,000 shares $109.79 million -6.3%N/A4.7 $6.35 1/15/202318,450,000 shares $145.57 million +1.2%N/A4.9 $7.89 12/30/202218,240,000 shares $126.22 million -1.1%N/A5.3 $6.92 12/15/202218,450,000 shares $143.54 million +1.0%N/A4.6 $7.78 11/30/202218,270,000 shares $142.32 million -5.2%N/A3.3 $7.79 11/15/202219,270,000 shares $148.38 million -14.5%N/A3.2 $7.70 10/31/202222,540,000 shares $141.33 million +0.5%N/A3.1 $6.27 10/15/202222,440,000 shares $143.39 million -1.2%N/A2.9 $6.39 9/30/202222,710,000 shares $143.75 million +13.0%N/A2.9 $6.33 9/15/202220,100,000 shares $142.51 million +1.8%N/A2.4 $7.09 8/31/202219,740,000 shares $115.28 million +19.9%N/A2 $5.84 8/15/202216,460,000 shares $112.42 million +8.4%N/A1.8 $6.83 7/31/202215,190,000 shares $61.52 million +13.3%N/A2 $4.05 7/15/202213,410,000 shares $64.50 million -11.1%N/A2 $4.81 6/30/202215,090,000 shares $62.47 million -13.8%N/A2.3 $4.14 6/15/202217,510,000 shares $60.93 million +39.0%32.1%3.2 $3.48 5/31/202212,600,000 shares $40.32 million +1.9%N/A5.2 $3.20 5/15/202212,370,000 shares $44.16 million +1.8%N/A5.3 $3.57 4/30/202212,150,000 shares $44.10 million +6.6%N/A5.4 $3.63 4/15/202211,400,000 shares $51.76 million -0.7%N/A4.8 $4.54 3/31/202211,480,000 shares $55.68 million +43.7%N/A4.8 $4.85 3/15/20227,990,000 shares $35.72 million +9.2%N/A3.1 $4.47 2/28/20227,320,000 shares $44.21 million +2.0%N/A3.1 $6.04 2/15/20227,180,000 shares $48.68 million +3.2%N/A3.1 $6.78 1/31/20226,960,000 shares $54.91 million +1.0%N/A2.8 $7.89 1/15/20226,890,000 shares $60.15 million +19.0%N/A2.9 $8.73 12/31/20215,790,000 shares $57.84 million +4.3%N/A2.8 $9.99 12/15/20215,550,000 shares $52.78 million -3.3%N/A2.8 $9.51 11/30/20215,740,000 shares $58.03 million +6.3%N/A3.9 $10.11 11/15/20215,400,000 shares $61.99 million +5.9%N/A3.8 $11.48 10/29/20215,100,000 shares $119.39 million -11.5%7.8%3.9 $23.41 10/15/20215,760,000 shares $120.38 million -0.2%8.8%4.9 $20.90 9/30/20215,770,000 shares $110.26 million +10.5%8.8%5.1 $19.11 9/15/20215,220,000 shares $92.92 million -8.6%7.9%3.8 $17.80 8/31/20215,710,000 shares $104.49 million -9.7%8.7%4 $18.30Utah’s New Oil Find (Ad)The Real Reason 218,000 Acres Just Vanished The government just quietly leased 218,000 acres in the middle of the Utah's Black Desert. Why? Not for oil discovery. Or uranium or solar. Instead, what’s happening beneath this patch of sand is the discovery of a new kind of energy. Google, Buffett, and a even tech billionaires like Gates, Bezos, and Zuckerberg are grabbing a stake.Find out why this could be the most lucrative "underground" energy story in America 8/13/20216,320,000 shares $116.73 million +1.1%9.6%4.5 $18.47 7/30/20216,250,000 shares $158.81 million +6.5%9.5%4.4 $25.41 7/15/20215,870,000 shares $161.60 million -7.3%8.9%4.7 $27.53 6/30/20216,330,000 shares $202.43 million +18.3%9.6%4.8 $31.98 6/15/20215,350,000 shares $175.64 million +4.7%8.1%4.1 $32.83 5/28/20215,110,000 shares $159.02 million -13.4%7.7%3.8 $31.12 5/14/20215,900,000 shares $172.93 million -7.1%N/A3.3 $29.31 4/30/20216,350,000 shares $191.96 million -4.4%N/A2.8 $30.23 4/15/20216,640,000 shares $196.15 million -2.1%N/A2.9 $29.54 3/31/20216,780,000 shares $194.04 million +25.3%N/A2.9 $28.62 3/15/20215,410,000 shares $175.45 million -14.7%N/A2.5 $32.43 2/26/20216,340,000 shares $178.28 million +4.1%N/A3.2 $28.12 2/12/20216,090,000 shares $278.74 million +2.4%N/A3.6 $45.77 1/29/20215,950,000 shares $267.75 million -3.1%N/A4.8 $45.00 1/15/20216,140,000 shares $318.36 million -15.0%N/A5.1 $51.85 12/31/20207,220,000 shares $318.47 million +3.9%N/A6.6 $44.11 12/15/20206,950,000 shares $309.62 million +1.6%N/A7 $44.55 11/30/20206,840,000 shares $301.37 million +0.2%N/A7.4 $44.06 11/15/20206,830,000 shares $314.25 million +7.7%N/A7.9 $46.01 10/30/20206,340,000 shares $335.32 million +3.1%N/A7.8 $52.89 10/15/20206,150,000 shares $343.11 million +0.5%N/A9.1 $55.79 9/30/20206,120,000 shares $330.17 million -0.7%N/A8.9 $53.95 9/15/20206,160,000 shares $327.77 million -10.1%N/A7.9 $53.21 8/31/20206,850,000 shares $406.21 million -0.3%N/A8 $59.30 8/14/20206,870,000 shares $409.93 million -2.1%N/A7.3 $59.67 7/31/20207,020,000 shares $426.11 million +0.7%N/A5.8 $60.70 7/15/20206,970,000 shares $459.39 million -5.2%N/A5.2 $65.91 6/30/20207,350,000 shares $448.64 million -2.7%N/A4.9 $61.04 6/15/20207,550,000 shares $479.73 million -0.5%N/A5.1 $63.54 BLUE Short Interest - Frequently Asked Questions What is bluebird bio's current short interest? Short interest is the volume of bluebird bio shares that have been sold short but have not yet been covered or closed out. As of May 15th, investors have sold 281,500 shares of BLUE short. 2.91% of bluebird bio's shares are currently sold short. Learn More on bluebird bio's current short interest. Which institutional investors are shorting bluebird bio? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of bluebird bio: Jane Street Group LLC, Equitec Proprietary Markets LLC, Simplex Trading LLC, National Bank of Canada FI, and FNY Investment Advisers LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for bluebird 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. 2.91% of bluebird bio's floating shares are currently sold short. Is bluebird bio's short interest increasing or decreasing? bluebird bio saw a drop in short interest during the month of May. As of May 15th, there was short interest totaling 281,500 shares, a drop of 34.3% from the previous total of 428,200 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 bluebird bio's float size? bluebird bio currently has issued a total of 9,792,000 shares. Some of bluebird 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. bluebird bio currently has a public float of 9,690,000 shares. How does bluebird bio's short interest compare to its competitors? 2.91% of bluebird bio's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to bluebird bio: SOPHiA GENETICS SA (0.06%), biote Corp. (3.08%), Kodiak Sciences Inc. (4.69%), Nuvectis Pharma, Inc. (19.61%), Inhibrx, Inc. (7.16%), ProQR Therapeutics (0.78%), Monopar Therapeutics Inc. (0.86%), Eledon Pharmaceuticals, Inc. (2.77%), Esperion Therapeutics, Inc. (13.54%), Voyager Therapeutics, Inc. (6.14%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Invesco QQQ ($29.20 billion), Strategy Incorporated ($10.88 billion), iShares 20+ Year Treasury Bond ETF ($10.04 billion), Capital One Financial Co. ($5.51 billion), Charter Communications, Inc. ($5.00 billion), Super Micro Computer, Inc. ($4.43 billion), Apollo Global Management, Inc. ($4.02 billion), Hims & Hers Health, Inc. ($3.65 billion), VanEck Semiconductor ETF ($3.27 billion), and Coinbase Global, Inc. ($3.10 billion). View all of the most shorted stocks. What does it mean to sell short bluebird bio stock? Short selling BLUE is an investing strategy that aims to generate trading profit from bluebird bio as its price is falling. 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 bluebird bio? A short squeeze for bluebird 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 BLUE, which in turn drives the price of the stock up even further. How often is bluebird 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 BLUE, twice per month. The most recent reporting period available is May, 15 2025. More Short Interest Resources from MarketBeat Related Companies SOPHiA GENETICS Short Interest Data biote Short Interest Data Kodiak Sciences Short Interest Data Nuvectis Pharma Short Interest Data Inhibrx Short Interest Data ProQR Therapeutics Short Interest Data Monopar Therapeutics Short Interest Data Eledon Pharmaceuticals Short Interest Data Esperion Therapeutics Short Interest Data Voyager Therapeutics 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:BLUE) was last updated on 6/13/2025 by MarketBeat.com Staff From Our PartnersUtah’s New Oil FindThe Real Reason 218,000 Acres Just Vanished The government just quietly leased 218,000 acres in the middle ...Stansberry Research | SponsoredWhy July 22nd Could Mean Big Changes for Social SecurityIn a stunning move, President Trump has authorized an AI-led transformation of federal agencies, including Soc...Altimetry | SponsoredTrump’s treachery Trump’s Final Reset Inside the shocking plot to re-engineer America’s financial system…and why you need to ...Porter & Company | SponsoredElon’s NEXT Big IPO?Cancel your internet TODAY!? 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