Amarin (AMRN) Short Interest Ratio & Short Volume $19.28 +0.01 (+0.05%) Closing price 10/8/2025 04:00 PM EasternExtended Trading$19.70 +0.42 (+2.18%) As of 08:00 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 ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Amarin Short Interest DataAmarin (AMRN) has a short interest of 405,700 shares, representing 1.96% of the float (the number of shares available for trading by the public). This marks a -4.59% decrease in short interest from the previous month. The short interest ratio (days to cover) is 4.3, indicating that it would take 4.3 days of the average trading volume of 92,272 shares to cover all short positions.Current Short Interest405,700 sharesPrevious Short Interest425,200 sharesChange Vs. Previous Month-4.59%Dollar Volume Sold Short$6.06 millionShort Interest Ratio4.3 Days to CoverLast Record DateSeptember 15, 2025Outstanding Shares20,680,000 sharesFloat Size20,680,000 sharesShort Percent of Float1.96%Today's Trading Volume93,970 sharesAverage Trading Volume92,272 sharesToday's Volume Vs. Average102% Short Selling Amarin? Sign up to receive the latest short interest report for Amarin 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 ChartAMRN Short Interest Over TimeAMRN Days to Cover Over TimeAMRN Percentage of Float Shorted Over Time Amarin Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 9/15/2025405,700 shares $6.06 million -4.6%2.0%4.3 $14.93 8/31/2025425,200 shares $6.40 million -0.1%2.1%4 $15.04 8/15/2025425,400 shares $6.66 million -10.8%2.1%3.9 $15.65 7/31/2025476,700 shares $6.92 million +15.2%2.3%4.3 $14.52 7/15/2025413,800 shares $6.53 million -7.7%2.0%3.6 $15.78 6/30/2025448,300 shares $7.27 million +4.2%2.2%3.5 $16.22 6/15/2025430,100 shares $5.70 million -13.8%2.1%3.7 $13.25 5/31/2025499,000 shares $5.79 million -10.6%2.4%4.8 $11.60 5/15/2025558,400 shares $5.87 million +18.3%2.7%5.8 $10.52 4/30/2025472,000 shares $5.08 million -25.0%2.3%5 $10.76 Get the Latest News and Ratings for AMRN and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amarin and its competitors with MarketBeat's FREE daily newsletter. 4/15/2025629,400 shares $6.17 million -94.7%3.1%7.1 $9.81 3/31/202511,970,000 shares $107.28 million +10.4%3.0%8 $8.96 3/15/202510,840,000 shares $4.49 million -35.4%2.7%6.9 $0.41 2/28/202516,790,000 shares $9.10 million -1.5%4.2%12 $0.54 2/15/202517,050,000 shares $10.44 million +1.2%4.2%12.2 $0.61 1/31/202516,850,000 shares $9.71 million -2.0%N/A11.2 $0.58 1/15/202517,190,000 shares $9.70 million -8.2%N/A11.2 $0.56 12/31/202418,720,000 shares $9.08 million +2.9%N/A13 $0.49 12/15/202418,190,000 shares $8.28 million +1.3%N/A14.2 $0.46 11/30/202417,950,000 shares $9.15 million +0.1%N/A16.8 $0.51 11/15/202417,930,000 shares $8.97 million -0.1%N/A18.6 $0.50 10/31/202417,950,000 shares $10.41 million -0.7%N/A21.4 $0.58 10/15/202418,080,000 shares $10.41 million +1.2%N/A16.6 $0.58 9/30/202417,870,000 shares $11.20 million -2.0%N/A15.3 $0.63 9/15/202418,230,000 shares $10.94 million +1.4%N/A14.6 $0.60 8/31/202417,980,000 shares $11.25 million -3.4%N/A12.1 $0.63 8/15/202418,610,000 shares $11.52 million +0.8%N/A10.7 $0.62 7/31/202418,470,000 shares $12.60 million -2.4%N/A10.8 $0.68 7/15/202418,930,000 shares $14.22 million -7.3%N/A13.1 $0.75 6/30/202420,430,000 shares $14.06 million +7.4%N/A14.4 $0.69 6/15/202419,020,000 shares $14.80 million +20.3%N/A12.8 $0.78 5/31/202415,810,000 shares $13.68 million -1.6%N/A10.8 $0.87 5/15/202416,060,000 shares $15.03 million -0.7%N/A11 $0.94 4/30/202416,180,000 shares $14.90 million +2.2%N/A10.6 $0.92 4/15/202415,840,000 shares $14.55 million -12.1%N/A9.4 $0.92 3/31/202418,020,000 shares $16.05 million -0.9%N/A8.2 $0.89 3/15/202418,190,000 shares $15.62 million +7.1%N/A7.9 $0.86 2/29/202416,990,000 shares $18.18 million +1.4%N/A6.7 $1.07 2/15/202416,750,000 shares $20.44 million +16.3%N/A7.3 $1.22 1/31/202414,400,000 shares $16.27 million +12.5%N/A6.3 $1.13 1/15/202412,800,000 shares $15.10 million -6.0%N/A5.6 $1.18 12/31/202313,620,000 shares $11.85 million -8.3%N/A6.2 $0.87 12/15/202314,860,000 shares $12.33 million +0.6%N/A8 $0.83 11/30/202314,770,000 shares $11.55 million -3.6%N/A8.8 $0.78 11/15/202315,320,000 shares $11.49 million -3.6%N/A9.8 $0.75 10/31/202315,890,000 shares $11.06 million -1.7%N/A8.5 $0.70 10/15/202316,160,000 shares $12.27 million +1.8%N/A8.5 $0.76 9/30/202315,870,000 shares $14.60 million -5.4%N/A6.7 $0.92 9/15/202316,780,000 shares $16.95 million +1.7%N/A7 $1.01 8/31/202316,500,000 shares $17.33 million -9.5%N/A6.7 $1.05 8/15/202318,240,000 shares $19.15 million -9.4%N/A7.2 $1.05 7/31/202320,130,000 shares $24.16 million -0.5%N/A8.3 $1.20 7/15/202320,240,000 shares $25.10 million -2.5%N/A8 $1.24 6/30/202320,760,000 shares $24.70 million +4.4%N/A10 $1.19 6/15/202319,880,000 shares $23.66 million -3.0%N/A8.6 $1.19 5/31/202320,500,000 shares $23.99 million -2.3%N/A7.7 $1.17 5/15/202320,980,000 shares $27.27 million -12.8%N/A6.6 $1.30 4/30/202324,070,000 shares $32.49 million +0.9%N/A6.9 $1.35 4/15/202323,860,000 shares $32.21 million +7.4%N/A5.9 $1.35 3/31/202322,220,000 shares $33.33 million +17.6%N/A4.9 $1.50 3/15/202318,890,000 shares $28.71 million +30.1%N/A4.1 $1.52 2/28/202314,520,000 shares $29.48 million +20.3%N/A3.1 $2.03 2/15/202312,070,000 shares $22.93 million -4.4%N/A2.8 $1.90 1/31/202312,620,000 shares $23.47 million -14.4%N/A2.8 $1.86 1/15/202314,740,000 shares $30.81 million +11.4%N/A3.9 $2.09 12/30/202213,230,000 shares $16.01 million +37.1%N/A4.2 $1.21 12/15/20229,650,000 shares $11.87 million -0.3%N/A3.3 $1.23 11/30/20229,680,000 shares $11.13 million +1.3%N/A3.4 $1.15 11/15/20229,560,000 shares $12.24 million -5.6%N/A3.2 $1.28 10/31/202210,130,000 shares $12.46 million +5.6%N/A3.3 $1.23 10/15/20229,590,000 shares $11.03 million +8.6%N/A3.1 $1.15 9/30/20228,830,000 shares $9.62 million -7.6%N/A2.7 $1.09 9/15/20229,560,000 shares $11.85 million -24.8%N/A2.7 $1.24 8/31/202212,720,000 shares $15.01 million -9.0%N/A3.4 $1.18 8/15/202213,980,000 shares $23.35 million -41.1%N/A3.8 $1.67 7/31/202223,740,000 shares $31.57 million -10.0%N/A5.7 $1.33 7/15/202226,390,000 shares $35.63 million +12.5%N/A5.3 $1.35 6/30/202223,460,000 shares $34.96 million +4.0%N/A5 $1.49 6/15/202222,550,000 shares $40.82 million +17.1%N/A5.1 $1.81 5/31/202219,250,000 shares $27.91 million +7.9%N/A4.5 $1.45 5/15/202217,840,000 shares $26.58 million -1.4%N/A4.6 $1.49 4/30/202218,090,000 shares $48.66 million +8.3%N/A5.1 $2.69 4/15/202216,700,000 shares $54.61 million +1.3%N/A5.1 $3.27 3/31/202216,490,000 shares $54.25 million -8.0%N/A4.7 $3.29 3/15/202217,920,000 shares $51.43 million +3.8%N/A4.9 $2.87 2/28/202217,260,000 shares $57.13 million +2.6%N/A4.5 $3.31 2/15/202216,830,000 shares $60.25 million +10.6%4.3%4.2 $3.58 1/31/202215,220,000 shares $55.10 million +1.5%3.9%3.4 $3.62 1/15/202215,000,000 shares $52.80 million +5.0%3.8%3.6 $3.52 12/31/202114,290,000 shares $48.16 million -19.3%3.6%3.9 $3.37 12/15/202117,710,000 shares $57.38 million +13.3%4.5%5 $3.24 11/30/202115,630,000 shares $56.27 million -2.2%4.0%4.7 $3.60 11/15/202115,980,000 shares $63.60 million -9.7%4.1%5 $3.98 10/29/202117,700,000 shares $84.43 million -3.2%4.5%5.4 $4.77 10/15/202118,280,000 shares $94.32 million +5.8%4.7%5.5 $5.16 9/30/202117,280,000 shares $88.13 million +1.4%4.4%5.1 $5.10 9/15/202117,050,000 shares $87.98 million +3.7%4.4%4.8 $5.16 8/31/202116,450,000 shares $89.49 million +27.1%4.2%4.4 $5.44 8/13/202112,940,000 shares $70.13 million -5.4%3.3%3.5 $5.42 7/30/202113,680,000 shares $56.64 million -31.7%3.5%4 $4.14 7/15/202120,040,000 shares $82.16 million -14.9%5.1%5.6 $4.10 6/30/202123,540,000 shares $103.11 million -6.1%6.0%5.6 $4.38 6/15/202125,080,000 shares $123.39 million +5.0%6.4%5.8 $4.92 5/28/202123,890,000 shares $108.46 million -2.5%6.1%5.5 $4.54 5/14/202124,490,000 shares $104.33 million -6.0%N/A4.6 $4.26 4/30/202126,040,000 shares $136.45 million +0.2%N/A4.6 $5.24 4/15/202126,000,000 shares $132.86 million +16.6%N/A3.9 $5.11 3/31/202122,290,000 shares $141.99 million +1.4%N/A3.4 $6.37 3/15/202121,980,000 shares $142.87 million +10.3%N/A3 $6.50 2/26/202119,930,000 shares $138.51 million -1.0%N/A2.5 $6.95 2/12/202120,140,000 shares $154.88 million -0.4%N/A2.5 $7.69 1/29/202120,210,000 shares $147.53 million -8.1%N/A2.4 $7.30 1/15/202121,990,000 shares $134.80 million -0.3%N/A2.9 $6.13 12/31/202022,060,000 shares $115.37 million -9.7%N/A3.1 $5.23 12/15/202024,420,000 shares $124.30 million +3.0%N/A3.4 $5.09 11/30/202023,710,000 shares $109.07 million -6.3%N/A3.2 $4.60 11/15/202025,310,000 shares $108.33 million +6.4%N/A2.7 $4.28 10/30/202023,780,000 shares $117.00 million -3.4%N/A2.9 $4.92 10/15/202024,610,000 shares $121.82 million -1.0%N/A2.8 $4.95 AMRN Short Interest - Frequently Asked Questions What is Amarin's current short interest? Short interest is the volume of Amarin shares that have been sold short but have not yet been closed out or covered. As of September 15th, traders have sold 405,700 shares of AMRN short. 1.96% of Amarin's shares are currently sold short. Learn More on Amarin's current short interest. What is a good short interest ratio for Amarin? 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. AMRN shares currently have a short interest ratio of 4.0. Learn More on Amarin's short interest ratio. Which institutional investors are shorting Amarin? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Amarin: Group One Trading LLC, and Jane Street Group LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Amarin? 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. 1.96% of Amarin's floating shares are currently sold short. Is Amarin's short interest increasing or decreasing? Amarin saw a decline in short interest during the month of September. As of September 15th, there was short interest totaling 405,700 shares, a decline of 4.6% from the previous total of 425,200 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 Amarin's float size? Amarin currently has issued a total of 20,680,000 shares. Some of Amarin'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. Amarin currently has a public float of 20,680,000 shares. How does Amarin's short interest compare to its competitors? 1.96% of Amarin's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Amarin: Stoke Therapeutics, Inc. (20.78%), Xeris Biopharma Holdings, Inc. (10.06%), Zymeworks Inc. (3.24%), Amylyx Pharmaceuticals, Inc. (11.02%), Sionna Therapeutics, Inc. (16.11%), Tilray Brands, Inc. (14.04%), Pharvaris N.V. (1.80%), Amphastar Pharmaceuticals, Inc. (12.07%), Evotec AG (0.19%), atai Life Sciences N.V. (13.01%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: AppLovin Corporation ($8.81 billion), Canadian Natural Resources Limited ($5.82 billion), Reddit Inc. ($5.19 billion), Coinbase Global, Inc. ($4.52 billion), Robinhood Markets, Inc. ($4.30 billion), Charter Communications, Inc. ($3.75 billion), CoreWeave Inc. ($3.66 billion), Seagate Technology Holdings PLC ($3.57 billion), Live Nation Entertainment, Inc. ($3.33 billion), and Rocket Lab Corporation ($3.26 billion). View all of the most shorted stocks. What does it mean to sell short Amarin stock? Short selling AMRN is an investing strategy that aims to generate trading profit from Amarin as its price is falling. AMRN shares are trading up $0.01 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 Amarin? A short squeeze for Amarin 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 AMRN, which in turn drives the price of the stock up even further. How often is Amarin'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 AMRN, twice per month. The most recent reporting period available is September, 15 2025. 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