iShares Biotechnology ETF (IBB) Short Interest Ratio & Short Volume $127.63 +1.12 (+0.89%) Closing price 04:00 PM EasternExtended Trading$128.74 +1.12 (+0.87%) As of 06:49 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 AnalysisChartDividendHeadlinesHoldingsOptions ChainOwnershipRatingsSEC FilingsShort InterestTrendsBuy This Stock iShares Biotechnology ETF Short Interest DataiShares Biotechnology ETF (IBB) has a short interest of 12.86 million shares, representing 29.39% of the float (the number of shares available for trading by the public). This marks a 15.65% increase in short interest from the previous month. The short interest ratio (days to cover) is 7.7, indicating that it would take 7.7 days of the average trading volume of 1.47 million shares to cover all short positions.Current Short Interest12,860,000 sharesPrevious Short Interest11,120,000 sharesChange Vs. Previous Month+15.65%Dollar Volume Sold Short$1.53 billionShort Interest Ratio7.7 Days to CoverLast Record DateMay 15, 2025Outstanding Shares42,200,000 sharesShort Percent of Float29.39%Today's Trading Volume1,766,678 sharesAverage Trading Volume1,466,316 sharesToday's Volume Vs. Average120% Short Selling iShares Biotechnology ETF? Sign up to receive the latest short interest report for iShares Biotechnology ETF and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartIBB Short Interest Over TimeIBB Days to Cover Over TimeIBB Percentage of Float Shorted Over Time iShares Biotechnology ETF Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/15/202512,860,000 shares $1.53 billion +15.7%29.4%7.7 $119.24 4/30/202511,120,000 shares $1.41 billion +6.8%N/A6.9 $126.58 4/15/202510,410,000 shares $1.25 billion +7.1%23.6%7.1 $119.85 3/31/20259,720,000 shares $1.24 billion -1.0%21.2%6.7 $127.90 3/15/20259,820,000 shares $1.32 billion +4.8%20.8%7.4 $134.19 2/28/20259,370,000 shares $1.28 billion +2.5%19.8%6.7 $137.03 2/15/20259,140,000 shares $1.25 billion -9.4%19.3%6.4 $136.55 1/31/202510,090,000 shares $1.40 billion -9.2%N/A6.7 $138.66 1/15/202511,110,000 shares $1.48 billion -1.1%N/A7.7 $133.42 12/31/202411,230,000 shares $1.48 billion -3.8%N/A8.4 $132.21 Get the Latest News and Ratings for IBB and Related StocksEnter your email address below to receive the latest news and analysts' ratings for iShares Biotechnology ETF and its competitors with MarketBeat's FREE daily newsletter. 12/15/202411,670,000 shares $1.59 billion +3.6%N/A9 $136.61 11/30/202411,260,000 shares $1.59 billion +9.5%N/A9.1 $141.55 11/15/202410,280,000 shares $1.37 billion +1.4%N/A8.6 $133.38 10/31/202410,140,000 shares $1.42 billion +3.3%N/A9.8 $140.29 10/15/20249,820,000 shares $1.43 billion +1.5%N/A8.8 $145.82 9/30/20249,680,000 shares $1.41 billion +4.1%N/A8 $145.60 9/15/20249,300,000 shares $1.37 billion -8.6%N/A7.4 $147.81 8/31/202410,180,000 shares $1.51 billion +0.4%N/A8.3 $148.17 8/15/202410,140,000 shares $1.47 billion -7.2%N/A7.7 $144.95 7/31/202410,930,000 shares $1.62 billion -10.5%N/A8 $147.97 7/15/202412,210,000 shares $1.77 billion No ChangeN/A8.7 $145.15 1/15/20248,740,000 shares $1.20 billion +4.3%N/A4.6 $137.13 12/31/20238,380,000 shares $1.14 billion -14.1%N/A4.2 $135.85 12/15/20239,760,000 shares $1.29 billion -8.9%N/A4.7 $131.78 11/30/202310,710,000 shares $1.30 billion +5.6%N/A5.5 $120.93 11/15/202310,140,000 shares $1.20 billion -3.9%N/A5.2 $118.03 10/31/202310,550,000 shares $1.20 billion +6.5%N/A5.7 $113.68 10/15/20239,910,000 shares $1.21 billion -2.5%N/A6 $121.63 9/30/202310,160,000 shares $1.24 billion +7.7%N/A6.7 $122.29 9/15/20239,430,000 shares $1.19 billion -7.0%N/A6.6 $126.61 8/31/202310,140,000 shares $1.31 billion -0.4%N/A6.6 $128.71 8/15/202310,180,000 shares $1.30 billion +1.9%N/A6.6 $128.01 7/31/20239,990,000 shares $1.29 billion +2.7%N/A6.3 $129.31 7/15/20239,730,000 shares $1.25 billion -7.3%N/A6 $128.24 6/30/202310,500,000 shares $1.33 billion +0.4%N/A6.5 $126.96 6/15/202310,460,000 shares $1.38 billion +10.2%N/A6.7 $131.81 5/31/20239,490,000 shares $1.20 billion +1.3%N/A6 $126.28 5/15/20239,370,000 shares $1.23 billion -6.4%N/A6 $131.74 4/30/202310,010,000 shares $1.31 billion +2.5%N/A6.4 $130.51 4/15/20239,770,000 shares $1.29 billion -0.8%N/A6.3 $132.43The #1 AI Energy Stock (Ad)Nearly $600 billion is projected to be spent on AI data centers this year. 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Thanks to AI's ravenous hunger for power … They are beginning to morph into sprawling behemoths.Click here to learn more about the #1 AI Energy Stock of 2025 3/31/20239,850,000 shares $1.27 billion -6.5%N/A6.4 $129.16 3/15/202310,530,000 shares $1.33 billion +12.4%N/A6.7 $126.06 2/28/20239,370,000 shares $1.19 billion -7.0%N/A6.2 $127.18 2/15/202310,070,000 shares $1.35 billion +6.7%N/A6.4 $133.77 1/31/20239,440,000 shares $1.29 billion -4.4%N/A5.6 $136.55 1/15/20239,870,000 shares $1.34 billion -5.5%N/A5.6 $136.23 12/30/202210,440,000 shares $1.37 billion +4.7%N/A5.7 $131.29 12/15/20229,970,000 shares $1.34 billion -8.8%N/A5.2 $134.24 11/30/202210,930,000 shares $1.49 billion +5.0%N/A5.5 $136.53 11/15/202210,410,000 shares $1.41 billion +6.9%N/A5.3 $135.11 10/31/20229,740,000 shares $1.25 billion -15.4%N/A5.1 $128.59 10/15/202211,510,000 shares $1.38 billion No ChangeN/A6.2 $119.58 9/30/20229,180,000 shares $1.07 billion +16.8%N/A4.9 $116.96 9/15/20227,860,000 shares $975.03 million +12.8%N/A4.1 $124.05 8/31/20226,970,000 shares $846.58 million -19.6%N/A3.5 $121.46 8/15/20228,670,000 shares $1.17 billion +14.4%N/A4.3 $134.82 7/31/20227,580,000 shares $940.53 million -2.3%N/A3.2 $124.08 7/15/20227,760,000 shares $956.42 million -12.7%N/A3 $123.25 6/30/20228,890,000 shares $1.05 billion +1.1%N/A3.3 $117.63 6/15/20228,790,000 shares $955.12 million +12.7%N/A3.2 $108.66 5/31/20227,800,000 shares $910.03 million -6.0%N/A2.9 $116.67 5/15/20228,300,000 shares $939.06 million +3.2%N/A3 $113.14 4/30/20228,040,000 shares $937.87 million -6.9%N/A3 $116.65 4/15/20228,640,000 shares $1.13 billion -9.5%N/A3.2 $130.86 3/31/20229,550,000 shares $1.24 billion -20.2%N/A3.5 $130.30 3/15/202211,970,000 shares $1.45 billion +6.2%N/A4.4 $121.13 2/28/202211,270,000 shares $1.42 billion +10.5%N/A4.1 $126.07 2/15/202210,200,000 shares $1.33 billion -4.5%N/A3.6 $129.98 1/31/202210,680,000 shares $1.41 billion +4.3%N/A4 $131.86 1/15/202210,240,000 shares $1.42 billion +9.6%N/A4.1 $138.95 12/31/20219,340,000 shares $1.43 billion -9.3%N/A4.3 $152.62 12/15/202110,300,000 shares $1.56 billion -1.4%N/A4.7 $151.90 11/30/202110,450,000 shares $1.61 billion -11.3%N/A5 $154.22 11/15/202111,780,000 shares $1.80 billion +6.9%N/A6 $153.18 10/29/202111,020,000 shares $1.76 billion -0.1%N/A5.2 $159.60 10/15/202111,030,000 shares $1.73 billion -14.6%N/A4.9 $157.06 9/30/202112,920,000 shares $2.09 billion +10.6%N/A5.1 $161.68 9/15/202111,680,000 shares $2.01 billion +1.9%N/A4.6 $171.80 8/31/202111,460,000 shares $1.97 billion +0.5%N/A4.3 $172.28 8/13/202111,400,000 shares $1.93 billion -12.6%N/A3.7 $169.40 7/30/202113,050,000 shares $2.16 billion -5.8%N/A4 $165.78 7/15/202113,860,000 shares $2.21 billion -4.6%N/A4.1 $159.25 6/30/202114,520,000 shares $2.38 billion -1.9%N/A4.3 $163.65 6/15/202114,800,000 shares $2.36 billion -0.9%N/A4.1 $159.44 5/28/202114,930,000 shares $2.27 billion -6.0%N/A4.1 $151.95 5/14/202115,880,000 shares $2.32 billion -16.8%N/A4.3 $146.13 4/30/202119,080,000 shares $2.96 billion -0.6%N/A5.3 $154.91 4/15/202119,190,000 shares $2.90 billion +10.8%N/A5.6 $151.34 3/31/202117,320,000 shares $2.54 billion -2.8%N/A5.1 $146.68 3/15/202117,810,000 shares $2.76 billion -10.0%N/A5.6 $154.75The #1 AI Energy Stock (Ad)Nearly $600 billion is projected to be spent on AI data centers this year. 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Thanks to AI's ravenous hunger for power … They are beginning to morph into sprawling behemoths.Click here to learn more about the #1 AI Energy Stock of 2025 2/26/202119,780,000 shares $3.11 billion -10.3%N/A6.6 $157.15 2/12/202122,060,000 shares $3.74 billion +5.4%N/A8.2 $169.73 1/29/202120,940,000 shares $3.36 billion -3.4%N/A7.4 $160.41 1/15/202121,680,000 shares $3.51 billion -11.2%N/A7.2 $161.87 12/31/202024,400,000 shares $3.72 billion -10.3%N/A8.1 $152.48 12/15/202027,190,000 shares $4.18 billion -4.1%N/A9.4 $153.63 11/30/202028,360,000 shares $4.06 billion +22.6%N/A9.5 $143.22 11/15/202023,140,000 shares $3.26 billion -3.1%N/A7.5 $141.06 10/30/202023,870,000 shares $3.18 billion +9.6%N/A7.9 $133.06 10/15/202021,790,000 shares $3.10 billion +3.3%N/A0 $142.45 9/30/202021,090,000 shares $2.86 billion -8.0%N/A7.1 $135.41 9/15/202020,780,000 shares $2.83 billion -9.3%N/A6.7 $136.07 8/31/202022,920,000 shares $3.11 billion +1.7%N/A7 $135.60 8/14/202022,530,000 shares $3.00 billion +2.5%N/A6.5 $133.36 7/31/202021,990,000 shares $2.95 billion +7.0%N/A6 $134.37 7/15/202020,550,000 shares $2.93 billion +0.9%N/A5.7 $142.62 IBB Short Interest - Frequently Asked Questions What is iShares Biotechnology ETF's current short interest? Short interest is the volume of iShares Biotechnology ETF shares that have been sold short but have not yet been closed out or covered. As of May 15th, investors have sold 12,860,000 shares of IBB short. 29.39% of iShares Biotechnology ETF's shares are currently sold short. Learn More on iShares Biotechnology ETF's current short interest. What is a good short interest ratio for iShares Biotechnology ETF? 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. IBB shares currently have a short interest ratio of 8.0. Learn More on iShares Biotechnology ETF's short interest ratio. Which institutional investors are shorting iShares Biotechnology ETF? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of iShares Biotechnology ETF: Quaker Wealth Management LLC, Jane Street Group LLC, Paloma Partners Management Co, Cubist Systematic Strategies LLC, PEAK6 LLC, Jane Street Group LLC, Capital Fund Management S.A., Jefferies Financial Group Inc., Dauntless Investment Group LLC, and Allianz Asset Management GmbH. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for iShares Biotechnology ETF? 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. 29.39% of iShares Biotechnology ETF's floating shares are currently sold short. Is iShares Biotechnology ETF's short interest increasing or decreasing? iShares Biotechnology ETF saw a increase in short interest in May. As of May 15th, there was short interest totaling 12,860,000 shares, an increase of 15.6% from the previous total of 11,120,000 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. How does iShares Biotechnology ETF's short interest compare to its competitors? 29.39% of iShares Biotechnology ETF's shares are currently sold short. Here is how the short interest of companies compare to iShares Biotechnology ETF: VanEck Pharmaceutical ETF (41.19%), VanEck Biotech ETF (0.26%), Invesco Dorsey Wright Healthcare Momentum ETF (0.23%), ProShares Ultra Nasdaq Biotechnology (1.96%), Invesco Nasdaq Biotechnology ETF (0.37%), First Trust Nasdaq Pharmaceuticals ETF (2.13%), JPMorgan Healthcare Leaders ETF (0.13%), and ProShares UltraShort Nasdaq Biotechnology (8.65%). 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), MicroStrategy Incorporated ($10.88 billion), iShares 20+ Year Treasury Bond ETF ($10.04 billion), Capital One Financial Corporation ($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 iShares Biotechnology ETF stock? Short selling IBB is an investing strategy that aims to generate trading profit from iShares Biotechnology ETF as its price is falling. IBB shares are trading up $1.12 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 iShares Biotechnology ETF? A short squeeze for iShares Biotechnology ETF 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 IBB, which in turn drives the price of the stock up even further. How often is iShares Biotechnology ETF'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 IBB, twice per month. The most recent reporting period available is May, 15 2025. 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