Prima BioMed (IMMP) Short Interest Ratio & Short Volume $1.67 -0.02 (-1.18%) Closing price 09/17/2025 04:00 PM EasternExtended Trading$1.66 -0.01 (-0.90%) As of 07:00 AM 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 ForecastsChartCompetitorsFDA EventsHeadlinesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Prima BioMed Short Interest DataPrima BioMed (IMMP) has a short interest of 4.29 million shares, representing 3.02% of the float (the number of shares available for trading by the public). This marks a 1.42% increase in short interest from the previous month. The short interest ratio (days to cover) is 50.2, indicating that it would take 50.2 days of the average trading volume of 87,287 shares to cover all short positions.Current Short Interest4,290,000 sharesPrevious Short Interest4,230,000 sharesChange Vs. Previous Month+1.42%Dollar Volume Sold Short$6.91 millionShort Interest Ratio50.2 Days to CoverLast Record DateAugust 31, 2025Outstanding Shares146,790,000 sharesShort Percent of Float3.02%Today's Trading Volume32,214 sharesAverage Trading Volume87,287 sharesToday's Volume Vs. Average37% Short Selling Prima BioMed? Sign up to receive the latest short interest report for Prima BioMed and its competitors with MarketBeat's FREE newsletter. Email Address Get Report View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartIMMP Short Interest Over TimeIMMP Days to Cover Over TimeIMMP Percentage of Float Shorted Over Time Prima BioMed Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 8/31/20254,290,000 shares $6.91 million +1.4%3.0%50.2 $1.61 8/15/20254,230,000 shares $7.32 million +1.7%N/A49.2 $1.73 7/31/20254,160,000 shares $7.24 million +0.2%2.9%38.7 $1.74 7/15/20254,150,000 shares $6.76 million -1.0%N/A14.8 $1.63 6/30/20254,190,000 shares $6.87 million No Change3.0%14.9 $1.64 6/15/20254,190,000 shares $7.29 million +1.2%3.0%14.8 $1.74 5/31/20254,140,000 shares $7.91 million +1.0%2.9%15.1 $1.91 5/15/20254,100,000 shares $8.12 million +1.0%2.9%15 $1.98 4/30/20254,060,000 shares $6.94 million -1.7%N/A15.9 $1.71 4/15/20254,130,000 shares $6.24 million -8.8%2.9%54.2 $1.51 Get the Latest News and Ratings for IMMP and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Prima BioMed and its competitors with MarketBeat's FREE daily newsletter. 3/31/20254,530,000 shares $7.97 million -4.6%3.2%58.5 $1.76 3/15/20254,750,000 shares $8.46 million -5.6%3.4%57.7 $1.78 2/28/20255,030,000 shares $9.71 million -1.2%3.6%47.6 $1.93 2/15/20255,090,000 shares $9.98 million -0.4%3.6%48.9 $1.96 1/31/20255,110,000 shares $10.68 million +1.0%N/A43.1 $2.09 1/15/20255,060,000 shares $9.72 million -1.2%N/A43 $1.92 12/31/20245,120,000 shares $11.11 million No ChangeN/A43.4 $2.17 12/15/20245,120,000 shares $11.16 million +0.8%N/A43.5 $2.18 11/30/20245,080,000 shares $10.31 million -1.0%N/A44.7 $2.03 11/15/20245,130,000 shares $10.52 million +2.4%N/A44.9 $2.05 10/31/20245,010,000 shares $9.09 million +0.8%N/A45.2 $1.82 10/15/20244,970,000 shares $10.24 million +4.2%N/A38.2 $2.06 9/30/20244,770,000 shares $10.54 million -0.6%N/A17.5 $2.21 9/15/20244,800,000 shares $12.67 million -0.6%N/A14.4 $2.64 8/31/20244,830,000 shares $12.70 million -2.2%N/A14.2 $2.63 8/15/20244,940,000 shares $10.72 million +4.4%N/A13.6 $2.17 7/31/20244,730,000 shares $10.22 million -10.1%N/A12.7 $2.16 7/15/20245,260,000 shares $10.73 million +18.5%N/A12.4 $2.04 6/30/20244,440,000 shares $8.92 million +6.2%N/A15 $2.01 6/15/20244,180,000 shares $11.33 million +6.6%N/A16.9 $2.71 5/31/20243,920,000 shares $11.68 million +5.1%N/A16.7 $2.98 5/15/20243,730,000 shares $10.52 million +38.7%N/A16.4 $2.82 4/30/20242,690,000 shares $7.24 million +84.3%N/A13.1 $2.69 4/15/20241,460,000 shares $3.37 million +15.9%N/A9.2 $2.31 3/31/20241,260,000 shares $2.94 million +10.5%N/A8.9 $2.33 3/15/20241,140,000 shares $2.72 million +5.6%N/A8.7 $2.39 2/29/20241,080,000 shares $2.53 million -0.9%N/A6.8 $2.34 2/15/20241,090,000 shares $2.51 million +25.3%N/A8 $2.30 1/31/2024869,600 shares $1.89 million +53.4%N/A6.1 $2.17 1/15/2024566,800 shares $1.46 million +4.9%N/A3.2 $2.58 12/31/2023540,200 shares $1.30 million +51.4%N/A3 $2.40 12/15/2023356,700 shares $888.18 thousand +3.5%N/A2.1 $2.49 11/30/2023344,700 shares $685.95 thousand -8.1%N/A2.4 $1.99 11/15/2023375,200 shares $690.37 thousand -7.1%N/A2.5 $1.84 10/31/2023403,900 shares $763.37 thousand -11.9%N/A2.8 $1.89 10/15/2023458,300 shares $843.27 thousand -3.5%N/A3 $1.84 9/30/2023474,800 shares $902.12 thousand -2.1%N/A3.5 $1.90 9/15/2023485,200 shares $980.10 thousand +2.0%N/A3 $2.02 8/31/2023475,600 shares $903.64 thousand +10.9%N/A2.6 $1.90 8/15/2023428,800 shares $861.89 thousand +12.5%N/A1.4 $2.01 7/31/2023381,100 shares $823.18 thousand +29.6%N/A0.2 $2.16 7/15/2023294,000 shares $640.92 thousand -40.0%N/A0.2 $2.18 6/30/2023490,300 shares $1.03 million -26.4%N/A0.3 $2.11 6/15/2023666,200 shares $1.42 million +1.9%N/A0.4 $2.13 5/31/2023653,800 shares $1.31 million -16.1%N/A0.4 $2.01 5/15/2023779,500 shares $1.20 million -0.4%N/A0.5 $1.54 4/30/2023782,600 shares $1.28 million -15.3%N/A9 $1.64 4/15/2023923,400 shares $1.47 million +16.4%N/A10.6 $1.59 3/31/2023793,500 shares $1.33 million -3.0%N/A10 $1.68 3/15/2023818,000 shares $1.42 million -0.6%N/A6 $1.73 2/28/2023822,900 shares $1.34 million +1.3%N/A5.6 $1.63 2/15/2023812,600 shares $1.44 million +5.0%N/A5 $1.77 1/31/2023773,800 shares $1.51 million +65.0%N/A4.4 $1.95 1/15/2023469,100 shares $942.89 thousand +8.1%N/A2.7 $2.01 12/30/2022434,000 shares $759.50 thousand +112.2%N/A2.6 $1.75 12/15/2022204,500 shares $384.46 thousand +9.1%N/A1.3 $1.88 11/30/2022187,400 shares $449.76 thousand -4.8%N/A2.1 $2.40 11/15/2022196,800 shares $429.02 thousand +4.7%N/A2.7 $2.18 10/31/2022188,000 shares $336.52 thousand -18.9%N/A2.8 $1.79 10/15/2022231,700 shares $443.71 thousand +32.5%N/A4 $1.92 9/30/2022174,900 shares $272.84 thousand +34.4%N/A3 $1.56 9/15/2022130,100 shares $243.29 thousand -12.3%N/A2.3 $1.87 8/31/2022148,400 shares $299.77 thousand +2.5%N/A2.1 $2.02 8/15/2022144,800 shares $327.25 thousand -6.9%N/A1.4 $2.26 7/31/2022155,500 shares $351.43 thousand -15.5%N/A1.5 $2.26 7/15/2022184,100 shares $386.61 thousand -13.1%N/A1.6 $2.10 6/30/2022211,800 shares $429.95 thousand -17.0%N/A1.8 $2.03 6/15/2022255,200 shares $548.68 thousand +12.9%N/A2 $2.15 5/31/2022226,100 shares $671.52 thousand +9.5%N/A1.6 $2.97 5/15/2022206,400 shares $497.42 thousand -10.6%N/A1.6 $2.41 4/30/2022230,800 shares $528.53 thousand +16.6%N/A1.7 $2.29 4/15/2022198,000 shares $504.90 thousand -6.7%N/A1.2 $2.55 3/31/2022212,100 shares $581.15 thousand -2.7%N/A1.2 $2.74 3/15/2022217,900 shares $542.57 thousand +20.5%N/A1.2 $2.49 2/28/2022180,900 shares $437.78 thousand +0.7%N/A0.9 $2.42 2/15/2022179,600 shares $470.55 thousand +18.8%N/A0.9 $2.62 1/31/2022151,200 shares $415.80 thousand +0.6%N/A0.5 $2.75 1/15/2022150,300 shares $486.97 thousand +13.4%N/A0 $3.24 12/31/2021132,600 shares $434.93 thousand +140.2%N/A0.4 $3.28 12/15/202155,200 shares $185.47 thousand -53.6%N/A0.2 $3.36 11/30/2021118,900 shares $407.83 thousand -44.3%N/A0.3 $3.43 11/15/2021213,300 shares $908.66 thousand +110.4%N/A0.6 $4.26 10/29/2021101,400 shares $433.99 thousand +83.0%N/A0.3 $4.28 10/15/202155,400 shares $218.83 thousand -97.9%N/A0.2 $3.95 9/30/20212,640,000 shares $10.22 million +3.9%N/A9.1 $3.87 9/15/20212,540,000 shares $9.75 million -3.1%N/A7.8 $3.84 8/31/20212,620,000 shares $11.11 million +13.4%N/A7.7 $4.24 8/13/20212,310,000 shares $8.22 million +17.9%N/A5.3 $3.56 7/30/20211,960,000 shares $6.70 million +44.1%N/A3.1 $3.42 7/15/20211,360,000 shares $4.80 million +155.9%N/A2 $3.53 6/30/2021531,400 shares $2.06 million +573.5%N/A0.8 $3.87 6/15/202178,900 shares $362.94 thousand -83.8%N/A0 $4.60 5/28/2021485,800 shares $2.45 million +89.4%N/A0.2 $5.04 5/14/2021256,500 shares $884.93 thousand +11.5%N/A0.1 $3.45 4/30/2021230,100 shares $796.15 thousand +93.7%N/A0.1 $3.46 4/15/2021118,800 shares $413.42 thousand -64.7%N/A0 $3.48 3/31/2021336,200 shares $968.26 thousand +122.4%N/A0.1 $2.88 3/15/2021151,200 shares $408.24 thousand +132.6%N/A0.2 $2.70 2/26/202165,000 shares $174.85 thousand +3.2%N/A0 $2.69 2/12/202163,000 shares $212.31 thousand +12.1%N/A0 $3.37 1/29/202156,200 shares $174.22 thousand -72.6%N/A0 $3.10 1/15/2021204,800 shares $716.80 thousand +558.5%N/A0 $3.50 12/31/202031,100 shares $96.10 thousand -96.9%N/A0 $3.09 12/15/2020996,400 shares $2.98 million +301.5%N/A0.2 $2.99 11/30/2020248,200 shares $471.58 thousand -20.7%N/A0.9 $1.90 11/15/2020313,100 shares $670.03 thousand +3.2%N/A1 $2.14 10/30/2020303,500 shares $543.27 thousand -14.1%N/A1 $1.79 10/15/2020353,100 shares $607.33 thousand -11.6%N/A0.9 $1.72 9/30/2020399,300 shares $690.79 thousand -5.8%N/A0.3 $1.73 IMMP Short Interest - Frequently Asked Questions What is Prima BioMed's current short interest? Short interest is the volume of Prima BioMed shares that have been sold short but have not yet been closed out or covered. As of August 31st, investors have sold 4,290,000 shares of IMMP short. 3.02% of Prima BioMed's shares are currently sold short. Learn More on Prima BioMed's current short interest. What is a good short interest ratio for Prima BioMed? 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. IMMP shares currently have a short interest ratio of 50.0. Learn More on Prima BioMed's short interest ratio. Which institutional investors are shorting Prima BioMed? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Prima BioMed: Group One Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Prima BioMed? 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. 3.02% of Prima BioMed's floating shares are currently sold short. Is Prima BioMed's short interest increasing or decreasing? Prima BioMed saw a increase in short interest in the month of August. As of August 31st, there was short interest totaling 4,290,000 shares, an increase of 1.4% from the previous total of 4,230,000 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 Prima BioMed's short interest compare to its competitors? 3.02% of Prima BioMed's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Prima BioMed: Upstream Bio, Inc. (15.43%), Spyre Therapeutics, Inc. (27.61%), uniQure N.V. (17.34%), Urogen Pharma (15.92%), Rapport Therapeutics, Inc. (18.04%), Arbutus Biopharma Corporation (6.91%), Phathom Pharmaceuticals, Inc. (24.11%), Taysha Gene Therapies, Inc. (15.54%), Iovance Biotherapeutics, Inc. (24.37%), Anavex Life Sciences Corp. (33.52%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($73.23 billion), Invesco QQQ ($29.52 billion), iShares Russell 2000 ETF ($20.82 billion), iShares 20+ Year Treasury Bond ETF ($10.76 billion), Palo Alto Networks, Inc. ($9.37 billion), Strategy Inc ($7.58 billion), Invesco S&P 500 Equal Weight ETF ($6.78 billion), SPDR S&P Biotech ETF ($6.72 billion), AppLovin Corporation ($6.37 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($6.29 billion). View all of the most shorted stocks. What does it mean to sell short Prima BioMed stock? Short selling IMMP is an investing strategy that aims to generate trading profit from Prima BioMed as its price is falling. IMMP shares are trading down $0.02 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 Prima BioMed? A short squeeze for Prima BioMed 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 IMMP, which in turn drives the price of the stock up even further. How often is Prima BioMed'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 IMMP, twice per month. The most recent reporting period available is August, 31 2025. More Short Interest Resources from MarketBeat Related Companies Upstream Bio Short Interest Spyre Therapeutics Short Interest uniQure Short Interest Urogen Pharma Short Interest Rapport Therapeutics Short Interest Arbutus Biopharma Short Interest Phathom Pharmaceuticals Short Interest Taysha Gene Therapies Short Interest Iovance Biotherapeutics Short Interest Anavex Life Sciences Short Interest Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:IMMP) was last updated on 9/18/2025 by MarketBeat.com Staff From Our PartnersREVEALED: Something Big Happening Behind White House Doorswhat I just learned about what’s unfolding in the White House is truly stunning… And you need to see it for...Paradigm Press | SponsoredGenerate up to $5,000/month with 10X less money?The secret to retiring without a million-dollar nest egg. 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