Altimmune (ALT) Short Interest Ratio & Short Volume $3.87 +0.37 (+10.57%) As of 04:00 PM Eastern 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 24.40 million shares, representing 31.37% of the float (the number of shares available for trading by the public). This marks a 11.01% increase in short interest from the previous month. The short interest ratio (days to cover) is 8.6, indicating that it would take 8.6 days of the average trading volume of 3.24 million shares to cover all short positions.Current Short Interest24,400,000 sharesPrevious Short Interest21,980,000 sharesChange Vs. Previous Month+11.01%Dollar Volume Sold Short$168.85 millionShort Interest Ratio8.6 Days to CoverLast Record DateJune 15, 2025Outstanding Shares81,110,000 sharesShort Percent of Float31.37%Today's Trading Volume19,031,463 sharesAverage Trading Volume3,238,842 sharesToday's Volume Vs. Average588% 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 6/15/202524,400,000 shares $168.85 million +11.0%31.4%8.6 $6.92 5/31/202521,980,000 shares $119.35 million -3.0%32.2%8.4 $5.43 5/15/202522,670,000 shares $131.03 million +0.4%33.2%8.8 $5.78 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 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. 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 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 $2.41New Rule Hits in July — The Smart Money Already Moved (Ad)A little-known regulation quietly goes into effect this July. 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We're talking about something they don't want you to notice — because the fewer people who act on this, the better it is for them.To help you get started, we're giving away a FREE Wealth Protection Guide that shows you exactly how 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 $2.92 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 $11.31Banks aren’t ready for this altcoin—are you? 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Discover the protocol that crypto whales are secretly accumulating... 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 $12.02 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 covered or closed out. As of June 15th, investors have sold 24,400,000 shares of ALT short. 31.37% of Altimmune's shares are currently sold 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, and IMC Chicago LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Altimmune? 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. 31.37% of Altimmune's floating shares are currently sold short. Is Altimmune's short interest increasing or decreasing? Altimmune saw a increase in short interest in the month of June. As of June 15th, there was short interest totaling 24,400,000 shares, an increase of 11.0% from the previous total of 21,980,000 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? 31.37% of Altimmune's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Altimmune: Bausch Health Cos Inc. (2.99%), Apellis Pharmaceuticals, Inc. (21.39%), Arrowhead Pharmaceuticals, Inc. (9.59%), Twist Bioscience Corporation (17.74%), Vericel Corporation (9.72%), Kiniksa Pharmaceuticals International, plc (6.95%), NewAmsterdam Pharma Company N.V. (11.20%), Denali Therapeutics Inc. (9.50%), Recursion Pharmaceuticals, Inc. (38.64%), Belite Bio, Inc. Sponsored ADR (0.57%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($69.26 billion), Invesco QQQ ($25.22 billion), iShares Russell 2000 ETF ($20.33 billion), iShares 20+ Year Treasury Bond ETF ($9.99 billion), MicroStrategy Incorporated ($9.12 billion), Canadian Natural Resources Limited ($6.73 billion), SPDR S&P Biotech ETF ($6.52 billion), Invesco S&P 500 Equal Weight ETF ($5.60 billion), Financial Select Sector SPDR Fund ($4.64 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.59 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 $0.51 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 increases 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 June, 15 2025. More Short Interest Resources from MarketBeat Related Companies BHC Short Squeeze APLS Short Squeeze ARWR Short Squeeze TWST Short Squeeze VCEL Short Squeeze KNSA Short Squeeze NAMS Short Squeeze DNLI Short Squeeze RXRX Short Squeeze BLTE 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 6/30/2025 by MarketBeat.com Staff From Our PartnersAI Meltdown Imminent: Dump These Stocks Now!If you have any money in the markets, especially in AI stocks… Please click here to see Elon Musk’s new inv...Paradigm Press | SponsoredI was wrong about TrumpI made a mistake. A mistake I feel very foolish about. 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