Insmed (INSM) Short Interest Ratio & Short Volume $142.53 -0.97 (-0.68%) Closing price 09/4/2025 04:00 PM EasternExtended Trading$143.18 +0.65 (+0.46%) As of 09/4/2025 07:43 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 AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Insmed Short Interest DataInsmed (INSM) has a short interest of 10.50 million shares. This marks a 10.06% increase in short interest from the previous month. The short interest ratio (days to cover) is 2.7, indicating that it would take 2.7 days of the average trading volume of 2.98 million shares to cover all short positions.Current Short Interest10,500,000 sharesPrevious Short Interest9,540,000 sharesChange Vs. Previous Month+10.06%Dollar Volume Sold Short$1.34 billionShort Interest Ratio2.7 Days to CoverLast Record DateAugust 15, 2025Outstanding Shares211,380,000 sharesPercentage of Shares Shorted4.97%Today's Trading Volume2,012,737 sharesAverage Trading Volume2,980,265 sharesToday's Volume Vs. Average68% Short Selling Insmed? Sign up to receive the latest short interest report for Insmed 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 ChartINSM Short Interest Over TimeINSM Days to Cover Over TimeINSM Percentage of Float Shorted Over Time Insmed Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 8/15/202510,500,000 shares $1.34 billion +10.1%N/A2.7 $127.80 7/31/20259,540,000 shares $1.02 billion -1.6%4.7%2.6 $107.28 7/15/20259,690,000 shares $996.81 million -1.1%N/A2.6 $102.87 6/30/20259,800,000 shares $986.27 million -15.9%5.3%2.7 $100.64 6/15/202511,650,000 shares $1.15 billion -33.3%6.3%3.8 $98.73 5/31/202517,460,000 shares $1.22 billion +6.0%10.2%7 $69.97 5/15/202516,470,000 shares $1.11 billion +4.4%9.7%7.4 $67.22 4/30/202515,780,000 shares $1.14 billion +4.4%N/A7.2 $72.00 4/15/202515,120,000 shares $1.07 billion +4.3%8.9%7.1 $71.07 3/31/202514,500,000 shares $1.11 billion +0.2%8.5%7.3 $76.29 Get the Latest News and Ratings for INSM and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Insmed and its competitors with MarketBeat's FREE daily newsletter. 3/15/202514,470,000 shares $1.11 billion -1.0%8.5%7.8 $76.55 2/28/202514,620,000 shares $1.19 billion +1.1%8.6%7.6 $81.55 2/15/202514,460,000 shares $1.15 billion -0.6%8.5%7.9 $79.31 1/31/202514,540,000 shares $1.11 billion -3.6%N/A8.1 $76.58 1/15/202515,090,000 shares $1.06 billion -2.3%N/A8.8 $70.20 12/31/202415,440,000 shares $1.07 billion +18.7%N/A10 $69.04 12/15/202413,010,000 shares $931.91 million +3.1%N/A8.5 $71.63 11/30/202412,620,000 shares $948.52 million +4.3%N/A8.3 $75.16 11/15/202412,100,000 shares $802.11 million -12.6%N/A7.8 $66.29 10/31/202413,850,000 shares $931.83 million +1.1%N/A8.1 $67.28 10/15/202413,700,000 shares $1.02 billion +3.8%N/A7.8 $74.66 9/30/202413,200,000 shares $963.60 million +8.0%N/A6.7 $73.00 9/15/202412,220,000 shares $912.35 million -0.1%N/A5.4 $74.66 8/31/202412,230,000 shares $935.23 million -9.4%N/A4.9 $76.47 8/15/202413,500,000 shares $1.00 billion -1.4%N/A3.7 $74.14 7/31/202413,690,000 shares $995.95 million -7.9%N/A3.9 $72.75 7/15/202414,870,000 shares $1.15 billion +15.9%N/A4.2 $77.47 6/30/202412,830,000 shares $859.61 million +10.9%N/A3.7 $67.00 6/15/202411,570,000 shares $739.55 million +6.5%N/A3.5 $63.92 5/31/202410,860,000 shares $597.84 million +9.4%N/A3.6 $55.05 5/15/20249,930,000 shares $247.55 million +16.4%N/A5.6 $24.93 4/30/20248,530,000 shares $210.86 million -9.3%N/A4.8 $24.72 4/15/20249,400,000 shares $252.11 million +4.0%N/A5.5 $26.82 3/31/20249,040,000 shares $245.26 million +2.3%N/A5.4 $27.13 3/15/20248,840,000 shares $227.36 million +3.2%N/A5.5 $25.72 2/29/20248,570,000 shares $237.56 million -7.2%N/A5 $27.72 2/15/20249,230,000 shares $265.36 million -11.2%N/A5.4 $28.75 1/31/202410,390,000 shares $288.84 million +9.1%N/A6.6 $27.80 1/15/20249,520,000 shares $270.94 million -7.8%N/A6 $28.46 12/31/202310,320,000 shares $319.82 million -14.9%N/A7 $30.99 12/15/202312,130,000 shares $344.73 million No ChangeN/A8.5 $28.42 11/30/202312,130,000 shares $303.49 million -14.4%N/A9 $25.02 11/15/202314,170,000 shares $352.83 million -8.2%N/A10.1 $24.90 10/31/202315,440,000 shares $386.93 million +13.4%N/A11.1 $25.06 10/15/202313,620,000 shares $337.23 million +6.4%N/A9.7 $24.76 9/30/202312,800,000 shares $323.20 million -6.4%N/A9.5 $25.25 9/15/202313,680,000 shares $364.02 million +10.0%N/A10.6 $26.61 8/31/202312,440,000 shares $272.31 million +11.9%N/A10.1 $21.89 8/15/202311,120,000 shares $250.31 million +9.1%N/A10.4 $22.51 7/31/202310,190,000 shares $225.10 million +5.6%N/A9.8 $22.09 7/15/20239,650,000 shares $198.79 million +7.7%N/A9.8 $20.60 6/30/20238,960,000 shares $189.06 million -4.6%N/A9 $21.10 6/15/20239,390,000 shares $187.89 million +4.2%N/A8.9 $20.01 5/31/20239,010,000 shares $171.46 million -2.7%N/A8.1 $19.03 5/15/20239,260,000 shares $178.44 million +1.7%N/A7.8 $19.27 4/30/20239,110,000 shares $177.65 million -8.2%N/A7.5 $19.50 4/15/20239,920,000 shares $166.16 million -6.7%N/A8.3 $16.75 3/31/202310,630,000 shares $181.24 million -3.7%N/A8.6 $17.05 3/15/202311,040,000 shares $197.28 million +6.0%N/A8.6 $17.87 2/28/202310,420,000 shares $212.36 million -2.5%N/A8 $20.38 2/15/202310,690,000 shares $218.18 million -6.4%N/A8.2 $20.41 1/31/202311,420,000 shares $245.87 million +6.0%N/A8.6 $21.53 1/15/202310,770,000 shares $209.48 million +0.8%N/A6.9 $19.45 12/30/202210,690,000 shares $213.59 million +16.1%N/A6.9 $19.98 12/15/20229,210,000 shares $179.23 million +16.9%N/A6.4 $19.46 11/30/20227,880,000 shares $145.70 million +6.1%N/A5.7 $18.49 11/15/20227,430,000 shares $140.35 million -4.3%N/A5.4 $18.89 10/31/20227,760,000 shares $134.40 million -10.3%N/A5.7 $17.32 10/15/20228,650,000 shares $179.06 million +0.5%N/A6.5 $20.70 9/30/20228,610,000 shares $185.46 million +7.2%N/A7.7 $21.54 9/15/20228,030,000 shares $194.17 million +22.6%N/A6.9 $24.18 8/31/20226,550,000 shares $161.26 million -3.3%N/A5.6 $24.62 8/15/20226,770,000 shares $185.50 million -5.8%N/A5.9 $27.40 7/31/20227,190,000 shares $159.04 million -20.6%N/A5.9 $22.12 7/15/20229,060,000 shares $209.56 million -17.4%N/A7.8 $23.13 6/30/202210,970,000 shares $216.33 million -4.1%N/A9.6 $19.72 6/15/202211,440,000 shares $203.63 million +4.9%15.6%10.1 $17.80 5/31/202210,910,000 shares $205.33 million -0.9%N/A10.2 $18.82 5/15/202211,010,000 shares $200.27 million -2.6%N/A10.3 $18.19 4/30/202211,300,000 shares $248.26 million +0.9%N/A11.4 $21.97 4/15/202211,200,000 shares $287.28 million +10.0%N/A11.7 $25.65 3/31/202210,180,000 shares $239.23 million +1.4%N/A10.8 $23.50 3/15/202210,040,000 shares $218.77 million -2.1%N/A11.5 $21.79 2/28/202210,260,000 shares $245.21 million +2.9%N/A11.7 $23.90 2/15/20229,970,000 shares $242.17 million +9.0%N/A11.7 $24.29 1/31/20229,150,000 shares $207.52 million +29.8%N/A11.5 $22.68 1/15/20227,050,000 shares $167.30 million -0.3%N/A9.2 $23.73 12/31/20217,070,000 shares $192.59 million -4.6%N/A9.4 $27.24 12/15/20217,410,000 shares $207.70 million +3.6%N/A9.2 $28.03 11/30/20217,150,000 shares $196.77 million -0.4%N/A8.6 $27.52 11/15/20217,180,000 shares $218.99 million -3.8%N/A8.8 $30.50 10/29/20217,460,000 shares $224.92 million -18.7%N/A9.2 $30.15 10/15/20219,180,000 shares $243.18 million +4.1%8.2%11.8 $26.49 9/30/20218,820,000 shares $242.90 million +1.5%7.9%11.4 $27.54 9/15/20218,690,000 shares $240.19 million -15.8%7.8%12.2 $27.64 8/31/202110,320,000 shares $289.37 million +7.1%9.3%13.4 $28.04 8/13/20219,640,000 shares $227.12 million +5.5%8.7%11.9 $23.56 7/30/20219,140,000 shares $224.84 million +12.7%8.2%7.7 $24.60 7/15/20218,110,000 shares $222.94 million -1.5%7.4%6.9 $27.49 6/30/20218,230,000 shares $234.23 million +0.9%7.5%7.2 $28.46 6/15/20218,160,000 shares $239.17 million +5.4%7.4%6.9 $29.31 5/28/20217,740,000 shares $190.40 million -5.8%7.1%6.1 $24.60 5/14/20218,220,000 shares $209.45 million +7.0%N/A6.4 $25.48 4/30/20217,680,000 shares $268.03 million -12.1%N/A6.7 $34.90 4/15/20218,740,000 shares $288.59 million -0.6%N/A9.3 $33.02 3/31/20218,790,000 shares $283.74 million +2.5%N/A9 $32.28 3/15/20218,580,000 shares $335.56 million +6.7%N/A8.8 $39.11 2/26/20218,040,000 shares $298.77 million +0.3%N/A9.2 $37.16 2/12/20218,020,000 shares $323.53 million -5.1%N/A9.7 $40.34 1/29/20218,450,000 shares $316.62 million -6.9%N/A10 $37.47 1/15/20219,080,000 shares $339.32 million -1.0%N/A10.3 $37.37 12/31/20209,170,000 shares $311.60 million -4.3%N/A10.9 $33.98 12/15/20209,580,000 shares $382.29 million -7.7%N/A11.4 $39.91 11/30/202010,380,000 shares $413.12 million -9.7%N/A12 $39.80 11/15/202011,500,000 shares $415.61 million +5.8%N/A13.5 $36.14 10/30/202010,870,000 shares $344.25 million -7.3%N/A13 $31.67 10/15/202011,730,000 shares $415.24 million +4.0%N/A14.9 $35.40 9/30/202011,280,000 shares $362.54 million -2.8%N/A14.3 $32.14 9/15/202011,600,000 shares $378.97 million -0.2%N/A13.9 $32.67 INSM Short Interest - Frequently Asked Questions What is Insmed's current short interest? Short interest is the volume of Insmed shares that have been sold short but have not yet been covered or closed out. As of August 15th, traders have sold 10,500,000 shares of INSM short. Learn More on Insmed's current short interest. What is a good short interest ratio for Insmed? 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. INSM shares currently have a short interest ratio of 3.0. Learn More on Insmed's short interest ratio. Which institutional investors are shorting Insmed? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Insmed: Nomura Holdings Inc., Group One Trading LLC, Boothbay Fund Management LLC, Bank of America Corp DE, 683 Capital Management LLC, Jane Street Group LLC, Caption Management LLC, Volterra Technologies LP, Squarepoint Ops LLC, OCONNOR A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS LLC , Walleye Capital LLC, Walleye Trading LLC, Jefferies Financial Group Inc., JPMorgan Chase & Co., Garda Capital Partners LP, and Quaker Wealth Management LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. Is Insmed's short interest increasing or decreasing? Insmed saw a increase in short interest during the month of August. As of August 15th, there was short interest totaling 10,500,000 shares, an increase of 10.1% from the previous total of 9,540,000 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 Insmed's short interest compare to its competitors? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Insmed: GSK PLC Sponsored ADR (0.56%), Takeda Pharmaceutical Co. (0.26%), argenex SE (2.96%), BioNTech SE Sponsored ADR (2.67%), Teva Pharmaceutical Industries Ltd. (4.03%), Summit Therapeutics PLC (4.01%), Genmab A/S Sponsored ADR (0.55%), Viatris Inc. (3.26%), Dr. Reddy's Laboratories Ltd (1.13%), Ascendis Pharma A/S (4.07%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Lucid Group, Inc. ($8.00 billion), Spotify Technology ($5.48 billion), AppLovin Corporation ($5.11 billion), Reddit Inc. ($5.02 billion), Coinbase Global, Inc. ($3.99 billion), Charter Communications, Inc. ($3.89 billion), Live Nation Entertainment, Inc. ($3.18 billion), Seagate Technology Holdings PLC ($2.59 billion), ResMed Inc. ($2.55 billion), and Rocket Lab Corporation ($2.52 billion). View all of the most shorted stocks. What does it mean to sell short Insmed stock? Short selling INSM is an investing strategy that aims to generate trading profit from Insmed as its price is falling. INSM shares are trading down $0.97 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 Insmed? A short squeeze for Insmed 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 INSM, which in turn drives the price of the stock up even further. How often is Insmed'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 INSM, twice per month. The most recent reporting period available is August, 15 2025. 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