Altimmune (ALT) Short Interest Ratio & Short Volume $5.68 -0.10 (-1.65%) As of 10:45 AM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Altimmune Short Interest DataAltimmune (ALT) has a short interest of 22.58 million shares. This marks a 0.62% increase in short interest from the previous month. The short interest ratio (days to cover) is 8.9, indicating that it would take 8.9 days of the average trading volume of 2.81 million shares to cover all short positions.Current Short Interest22,580,000 sharesPrevious Short Interest22,440,000 sharesChange Vs. Previous Month+0.62%Dollar Volume Sold Short$118.55 millionShort Interest Ratio8.9 Days to CoverLast Record DateApril 30, 2025Outstanding Shares81,107,000 sharesPercentage of Shares Shorted27.84%Today's Trading Volume553,434 sharesAverage Trading Volume2,812,026 sharesToday's Volume Vs. Average20% Short Selling Altimmune? Sign up to receive the latest short interest report for Altimmune and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartALT Short Interest Over TimeALT Days to Cover Over TimeALT Percentage of Float Shorted Over Time Altimmune Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 4/30/202522,580,000 shares $118.55 million +0.6%N/A8.9 $5.25 4/15/202522,440,000 shares $101.65 million +2.8%32.9%9.2 $4.53 3/31/202521,820,000 shares $109.10 million -2.8%32.0%8.5 $5.00 3/15/202522,450,000 shares $132.90 million +3.6%32.9%8.6 $5.92 2/28/202521,670,000 shares $144.11 million -3.6%31.8%8.2 $6.65 2/15/202522,470,000 shares $143.13 million -3.6%32.9%8.6 $6.37 1/31/202523,320,000 shares $154.84 million -5.2%N/A7.3 $6.64 1/15/202524,590,000 shares $161.80 million +3.8%N/A7.7 $6.58 12/31/202423,690,000 shares $170.80 million -0.7%N/A7.5 $7.21 12/15/202423,850,000 shares $215.37 million +1.8%N/A7.8 $9.03 Get the Latest News and Ratings for ALT and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Altimmune and its competitors with MarketBeat's FREE daily newsletter. 11/30/202423,430,000 shares $200.80 million +2.6%N/A7.7 $8.57 11/15/202422,840,000 shares $173.81 million -0.4%N/A8.4 $7.61 10/31/202422,940,000 shares $154.62 million +3.2%N/A10.6 $6.74 10/15/202422,230,000 shares $156.50 million -0.8%N/A10.1 $7.04 9/30/202422,400,000 shares $137.54 million +2.4%N/A9.3 $6.14 9/15/202421,870,000 shares $172.34 million -0.6%N/A6.9 $7.88 8/31/202422,000,000 shares $147.40 million +1.4%N/A6.7 $6.70 8/15/202421,700,000 shares $135.41 million -2.4%N/A6.5 $6.24 7/31/202422,240,000 shares $141.45 million -1.6%N/A6.3 $6.36 7/15/202422,610,000 shares $178.62 million +1.7%N/A6.4 $7.90 6/30/202422,240,000 shares $147.90 million -3.9%N/A6.2 $6.65 6/15/202423,140,000 shares $141.39 million -1.4%N/A6.5 $6.11 5/31/202423,470,000 shares $176.26 million +1.8%N/A7 $7.51 5/15/202423,060,000 shares $204.54 million +3.4%N/A5.5 $8.87 4/30/202422,310,000 shares $146.13 million +9.5%N/A4.9 $6.55 4/15/202420,370,000 shares $153.79 million +14.9%N/A4.3 $7.55 3/31/202417,730,000 shares $180.49 million +41.7%N/A3.2 $10.18 3/15/202412,510,000 shares $123.35 million +15.7%N/A1.9 $9.86 2/29/202410,810,000 shares $130.80 million -6.4%N/A1.1 $12.10 2/15/202411,550,000 shares $103.37 million +15.4%N/A1 $8.95 1/31/202410,010,000 shares $94.49 million -6.1%N/A0.9 $9.44 1/15/202410,660,000 shares $127.92 million +12.9%N/A1 $12.00 12/31/20239,440,000 shares $106.20 million -14.9%N/A1 $11.25 12/15/202311,090,000 shares $85.06 million +71.9%N/A1.3 $7.67 11/30/20236,450,000 shares $20.38 million -4.2%N/A1 $3.16 11/15/20236,730,000 shares $16.42 million -1.9%N/A5.8 $2.44 10/31/20236,860,000 shares $16.53 million -7.3%N/A5.9 $2.41 10/15/20237,400,000 shares $19.68 million +3.5%N/A6.9 $2.66 9/30/20237,150,000 shares $18.59 million +9.3%N/A6.5 $2.60 9/15/20236,540,000 shares $19.10 million +8.5%N/A5.3 $2.92Volatility Is Rising—But These 2 AI Stocks Could Thrive (Ad)2025 is off to a turbulent start—markets are swinging wildly, inflation pressures remain high, and recession fears are creeping back into headlines. But even in uncertain times, innovation doesn’t slow down. In fact, artificial intelligence (AI) is accelerating faster than ever—creating new profit opportunities while the broader market struggles. Our latest research reveals two AI stocks trading under $15 that could thrive even as volatility grows. These under-the-radar companies are positioned to ride the next wave of AI-driven demand—and they’re still flying below most investors’ radar.👉[Click here to access your FREE AI stocks report now.] 8/31/20236,030,000 shares $15.26 million +4.3%N/A3.7 $2.53 8/15/20235,780,000 shares $16.24 million -6.2%N/A3.3 $2.81 7/31/20236,160,000 shares $20.39 million -16.2%N/A3.4 $3.31 7/15/20237,350,000 shares $24.11 million +5.6%N/A4.1 $3.28 6/30/20236,960,000 shares $24.57 million -23.8%N/A3.6 $3.53 6/15/20239,130,000 shares $37.34 million +0.6%N/A4.3 $4.09 5/31/20239,080,000 shares $36.68 million +2.6%N/A4.2 $4.04 5/15/20238,850,000 shares $42.92 million -2.1%N/A4.3 $4.85 4/30/20239,040,000 shares $45.65 million -8.3%N/A4.5 $5.05 4/15/20239,860,000 shares $47.13 million +3.8%N/A4.8 $4.78 3/31/20239,500,000 shares $40.09 million +28.4%N/A4.9 $4.22 3/15/20237,400,000 shares $80.88 million +16.0%N/A3.9 $10.93 2/28/20236,380,000 shares $80.32 million +1.9%N/A4.6 $12.59 2/15/20236,260,000 shares $75.06 million +1.5%N/A4.5 $11.99 1/31/20236,170,000 shares $84.16 million -15.7%N/A4.3 $13.64 1/15/20237,320,000 shares $119.24 million -3.4%N/A5.3 $16.29 12/30/20227,580,000 shares $124.69 million +19.6%N/A5.6 $16.45 12/15/20226,340,000 shares $66.38 million -3.4%N/A4.5 $10.47 11/30/20226,560,000 shares $65.27 million -10.0%N/A2.9 $9.95 11/15/20227,290,000 shares $79.61 million +1.8%N/A3.2 $10.92 10/31/20227,160,000 shares $89.79 million +1.6%N/A2.9 $12.54 10/15/20227,050,000 shares $73.32 million -8.4%N/A2.9 $10.40 9/30/20227,700,000 shares $98.33 million +13.9%N/A3.1 $12.77 9/15/20226,760,000 shares $97.28 million +9.7%N/A2.6 $14.39 8/31/20226,160,000 shares $136.01 million +26.8%N/A3.3 $22.08 8/15/20224,860,000 shares $85.24 million No ChangeN/A2.9 $17.54 7/31/20224,860,000 shares $58.37 million +10.5%N/A3.2 $12.01 7/15/20224,400,000 shares $49.85 million -26.3%N/A3.1 $11.33 6/30/20225,970,000 shares $69.85 million -3.1%N/A4.5 $11.70 6/15/20226,160,000 shares $51.25 million +56.4%N/A5.4 $8.32 5/31/20223,940,000 shares $19.94 million +2.3%N/A4.7 $5.06 5/15/20223,850,000 shares $19.87 million +27.5%N/A4.5 $5.16 4/30/20223,020,000 shares $13.65 million +6.3%N/A3.6 $4.52 4/15/20222,840,000 shares $14.85 million +7.6%N/A3.3 $5.23 3/31/20222,640,000 shares $16.08 million -36.2%N/A3.2 $6.09 3/15/20224,140,000 shares $24.43 million +5.1%N/A4.8 $5.90 2/28/20223,940,000 shares $29.20 million +9.4%10.5%5.4 $7.41 2/15/20223,600,000 shares $28.58 million +6.8%9.6%5 $7.94 1/31/20223,370,000 shares $27.20 million -26.4%10.0%4.4 $8.07 1/15/20224,580,000 shares $35.91 million +2.0%13.6%6.2 $7.84 12/31/20214,490,000 shares $41.13 million +4.7%13.4%6 $9.16 12/15/20214,290,000 shares $38.95 million -0.5%12.8%4 $9.08 11/30/20214,310,000 shares $45.21 million -9.5%12.8%3.8 $10.49 11/15/20214,760,000 shares $53.12 million -15.2%14.2%3.8 $11.16 10/29/20215,610,000 shares $60.59 million -1.9%16.6%4.2 $10.80 10/15/20215,720,000 shares $68.70 million -6.7%16.9%4.3 $12.01 9/30/20216,130,000 shares $69.33 million -7.8%18.1%4.5 $11.31 9/15/20216,650,000 shares $109.92 million +4.2%19.7%4.1 $16.53 8/31/20216,380,000 shares $95.64 million +21.5%18.9%3.2 $14.99 8/13/20215,250,000 shares $63.11 million +5.0%15.5%2.7 $12.02Volatility Is Rising—But These 2 AI Stocks Could Thrive (Ad)2025 is off to a turbulent start—markets are swinging wildly, inflation pressures remain high, and recession fears are creeping back into headlines. But even in uncertain times, innovation doesn’t slow down. In fact, artificial intelligence (AI) is accelerating faster than ever—creating new profit opportunities while the broader market struggles. Our latest research reveals two AI stocks trading under $15 that could thrive even as volatility grows. These under-the-radar companies are positioned to ride the next wave of AI-driven demand—and they’re still flying below most investors’ radar.👉[Click here to access your FREE AI stocks report now.] 7/30/20215,000,000 shares $45.35 million -4.9%15.4%2.7 $9.07 7/15/20215,260,000 shares $45.34 million +13.4%16.2%2.8 $8.62 6/30/20214,640,000 shares $45.70 million +10.2%14.3%2.4 $9.85 6/15/20214,210,000 shares $59.49 million -0.5%13.0%3.2 $14.13 5/28/20214,230,000 shares $53.51 million -19.6%13.0%3.8 $12.65 5/14/20215,260,000 shares $67.01 million +4.2%N/A4.4 $12.74 4/30/20215,050,000 shares $71.81 million +4.3%N/A3.8 $14.22 4/15/20214,840,000 shares $62.68 million -10.7%N/A3.1 $12.95 3/31/20215,420,000 shares $73.44 million +82.5%N/A3.4 $13.55 3/15/20212,970,000 shares $49.78 million +23.2%N/A1.7 $16.76 2/26/20212,410,000 shares $41.45 million -4.4%N/A1.4 $17.20 2/12/20212,520,000 shares $55.64 million -3.5%N/A1.3 $22.08 1/29/20212,610,000 shares $35.10 million +0.4%N/A1.3 $13.45 1/15/20212,600,000 shares $35.28 million -11.3%N/A1.5 $13.57 12/31/20202,930,000 shares $33.11 million +17.7%N/A1.5 $11.30 12/15/20202,490,000 shares $33.22 million +14.2%N/A1.4 $13.34 11/30/20202,180,000 shares $22.93 million -9.9%N/A1.2 $10.52 11/15/20202,420,000 shares $24.51 million -16.8%N/A1.5 $10.13 10/30/20202,910,000 shares $33.26 million +25.4%N/A1.8 $11.43 10/15/20202,320,000 shares $29.70 million +11.5%N/A1.3 $12.80 9/30/20202,080,000 shares $27.46 million +41.5%N/A0.8 $13.20 9/15/20201,470,000 shares $18.30 million +44.1%N/A0.4 $12.45 ALT Short Interest - Frequently Asked Questions What is Altimmune's current short interest? Short interest is the volume of Altimmune shares that have been sold short but have not yet been closed out or covered. As of April 30th, investors have sold 22,580,000 shares of ALT short. Learn More on Altimmune's current short interest. What is a good short interest ratio for Altimmune? 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. ALT shares currently have a short interest ratio of 9.0. Learn More on Altimmune's short interest ratio. Which institutional investors are shorting Altimmune? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Altimmune: Jane Street Group LLC, Millennium Management LLC, Caption Management LLC, Sculptor Capital LP, PEAK6 LLC, Walleye Trading LLC, Walleye Capital LLC, Simplex Trading LLC, IMC Chicago LLC, and Jefferies Financial Group Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. Is Altimmune's short interest increasing or decreasing? Altimmune saw a increase in short interest in April. As of April 30th, there was short interest totaling 22,580,000 shares, an increase of 0.6% from the previous total of 22,440,000 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 Altimmune's short interest compare to its competitors? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Altimmune: Beam Therapeutics Inc. (19.15%), Arcutis Biotherapeutics, Inc. (12.70%), Agios Pharmaceuticals, Inc. (7.05%), Schrödinger, Inc. (13.62%), Disc Medicine, Inc. (14.68%), Bausch Health Companies Inc. (3.38%), Centessa Pharmaceuticals plc (6.32%), Indivior PLC (2.20%), Biohaven Ltd. (7.65%), IDEAYA Biosciences, Inc. (13.45%), 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 Altimmune stock? Short selling ALT is an investing strategy that aims to generate trading profit from Altimmune as its price is falling. ALT shares are trading up $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 Altimmune? A short squeeze for Altimmune 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 ALT, which in turn drives the price of the stock up even further. How often is Altimmune'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 ALT, twice per month. The most recent reporting period available is April, 30 2025. More Short Interest Resources from MarketBeat Related Companies BEAM Short Squeeze ARQT Short Squeeze AGIO Short Squeeze SDGR Short Squeeze IRON Short Squeeze BHC Short Squeeze CNTA Short Squeeze INDV Short Squeeze BHVN Short Squeeze IDYA Short Squeeze Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:ALT) was last updated on 5/23/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredWhite House to reset Social Security?Elon Musk's parting DOGE gift looks set to shock America... 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