Inspire Medical Systems (INSP) Short Interest Ratio & Short Volume $146.59 -3.11 (-2.08%) Closing price 03:59 PM EasternExtended Trading$146.36 -0.23 (-0.15%) As of 04:34 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Inspire Medical Systems Short Interest DataInspire Medical Systems (INSP) has a short interest of 2.92 million shares, representing 10.26% of the float (the number of shares available for trading by the public). This marks a 0.69% increase in short interest from the previous month. The short interest ratio (days to cover) is 5.2, indicating that it would take 5.2 days of the average trading volume of 591,130 shares to cover all short positions.Current Short Interest2,920,000 sharesPrevious Short Interest2,900,000 sharesChange Vs. Previous Month+0.69%Dollar Volume Sold Short$466.04 millionShort Interest Ratio5.2 Days to CoverLast Record DateMarch 31, 2025Outstanding Shares29,760,000 sharesShort Percent of Float10.26%Today's Trading Volume273,216 sharesAverage Trading Volume591,130 sharesToday's Volume Vs. Average46% Short Selling Inspire Medical Systems? Sign up to receive the latest short interest report for Inspire Medical Systems and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartINSP Short Interest Over TimeINSP Days to Cover Over TimeINSP Percentage of Float Shorted Over Time Remove Ads Inspire Medical Systems Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 3/31/20252,920,000 shares $466.04 million +0.7%10.3%5.2 $159.60 3/15/20252,900,000 shares $470.57 million -7.6%10.2%5.2 $162.26 2/28/20253,140,000 shares $582.66 million +8.3%11.0%5.8 $185.56 2/15/20252,900,000 shares $535.73 million +15.1%10.2%5.4 $184.73 1/31/20252,520,000 shares $488.63 million +10.5%N/A4.6 $193.90 1/15/20252,280,000 shares $401.90 million -3.8%N/A4.2 $176.27 12/31/20242,370,000 shares $439.35 million +2.2%N/A4.9 $185.38 12/15/20242,320,000 shares $435.77 million +16.0%N/A4.8 $187.83 11/30/20242,000,000 shares $385.52 million -10.7%N/A3.5 $192.76 11/15/20242,240,000 shares $387.18 million +14.9%N/A3.7 $172.85 Get the Latest News and Ratings for INSP and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Inspire Medical Systems and its competitors with MarketBeat's FREE daily newsletter. 10/31/20241,950,000 shares $380.39 million +2.1%N/A3.4 $195.07 10/15/20241,910,000 shares $379.92 million -4.5%N/A3 $198.91 9/30/20242,000,000 shares $422.10 million +65.3%N/A3.1 $211.05 9/15/20241,210,000 shares $246.83 million -6.9%N/A1.7 $203.99 8/31/20241,300,000 shares $233.77 million +2.4%N/A2.1 $179.82 8/15/20241,270,000 shares $241.07 million +5.8%N/A2.1 $189.82 7/31/20241,200,000 shares $169.26 million -16.7%N/A1.6 $141.05 7/15/20241,440,000 shares $199.74 million -11.1%N/A2.3 $138.71 6/30/20241,620,000 shares $216.80 million -9.5%N/A2.4 $133.83 6/15/20241,790,000 shares $298.43 million -8.7%N/A2.7 $166.72 5/31/20241,960,000 shares $311.40 million +6.0%N/A3.3 $158.88 5/15/20241,850,000 shares $295.50 million -19.6%N/A3.2 $159.73 4/30/20242,300,000 shares $555.82 million -0.4%N/A3.9 $241.66 4/15/20242,310,000 shares $515.45 million +11.1%N/A4.6 $223.14 3/31/20242,080,000 shares $446.76 million +11.2%N/A4.3 $214.79 3/15/20241,870,000 shares $360.44 million +6.9%N/A3.7 $192.75 2/29/20241,750,000 shares $313.02 million -1.1%N/A3 $178.87 2/15/20241,770,000 shares $340.94 million +12.7%N/A2.9 $192.62 1/31/20241,570,000 shares $331.07 million +14.6%N/A2.2 $210.87 1/15/20241,370,000 shares $254.63 million +8.7%N/A1.9 $185.86 12/31/20231,260,000 shares $256.32 million +12.5%N/A1.6 $203.43 12/15/20231,120,000 shares $210.41 million +9.8%N/A1.5 $187.87 11/30/20231,020,000 shares $148.24 million -22.7%N/A1.4 $145.33 11/15/20231,320,000 shares $192.40 million +10.0%N/A1.8 $145.76 10/31/20231,200,000 shares $176.59 million +2.6%N/A1.7 $147.16 10/15/20231,170,000 shares $176.05 million -7.1%N/A1.8 $150.47 9/30/20231,260,000 shares $250.03 million +6.8%N/A2.3 $198.44 9/15/20231,180,000 shares $248.94 million +14.6%N/A2.3 $210.97 8/31/20231,030,000 shares $233.75 million -2.8%N/A1.9 $226.94 8/15/20231,060,000 shares $261.25 million +41.2%N/A2.2 $246.46Altucher: Turn $900 into $108,000 in just 12 months? (Ad)We are entering the final Trump Bump of our lives. But the biggest returns will not be in the stock market.If I’m right about this (like I was before) a modest $900 investment… 7/31/2023750,900 shares $216.07 million -12.1%N/A1.7 $287.75 7/15/2023854,400 shares $278.60 million -4.9%N/A2 $326.08 6/30/2023898,100 shares $291.41 million -32.0%N/A2.2 $324.47 6/15/20231,320,000 shares $402.47 million No ChangeN/A3.1 $304.90 5/31/20231,320,000 shares $385.88 million +11.9%N/A3.6 $292.33 5/15/20231,180,000 shares $349.34 million -5.6%N/A3.3 $296.05 4/30/20231,250,000 shares $334.54 million -10.1%N/A3.4 $267.63 4/15/20231,390,000 shares $363.15 million +10.3%N/A4.2 $261.26 3/31/20231,260,000 shares $294.93 million +26.0%N/A3.9 $234.07 3/15/20231,000,000 shares $242.06 million -2.9%N/A3.3 $242.06 2/28/20231,030,000 shares $267.73 million -15.6%N/A3.5 $259.93 2/15/20231,220,000 shares $339.17 million +11.9%N/A4.1 $278.01 1/31/20231,090,000 shares $275.84 million +5.8%N/A3.8 $253.06 1/15/20231,030,000 shares $264.64 million +11.2%N/A3.4 $256.93 12/30/2022926,200 shares $233.29 million +4.3%N/A2.9 $251.88 12/15/2022888,300 shares $227.11 million -21.4%N/A2.8 $255.67 11/30/20221,130,000 shares $272.97 million -7.4%N/A3.5 $241.57 11/15/20221,220,000 shares $260.47 million +0.8%N/A3.9 $213.50 10/31/20221,210,000 shares $235.89 million -11.0%N/A3.9 $194.95 10/15/20221,360,000 shares $223.07 million +8.8%N/A4.7 $164.02 9/30/20221,250,000 shares $221.71 million +9.7%N/A4.7 $177.37 9/15/20221,140,000 shares $226.23 million -14.9%N/A4.3 $198.45 8/31/20221,340,000 shares $256.60 million -6.9%N/A5 $191.49 8/15/20221,440,000 shares $322.46 million +2.1%N/A5.6 $223.93 7/31/20221,410,000 shares $294.68 million +1.4%5.2%4.8 $208.99 7/15/20221,390,000 shares $277.83 million +0.7%5.1%4.6 $199.88 6/30/20221,380,000 shares $252.08 million -3.5%5.1%4.4 $182.67 6/15/20221,430,000 shares $239.57 million -2.7%5.3%4.5 $167.53 5/31/20221,470,000 shares $259.94 million +7.3%5.4%5 $176.83 5/15/20221,370,000 shares $226.19 million +6.2%5.1%4.6 $165.10 4/30/20221,290,000 shares $265.43 million -3.7%4.8%4.5 $205.76 4/15/20221,340,000 shares $329.69 million +6.4%5.0%5.1 $246.04 3/31/20221,260,000 shares $323.43 million +9.6%4.7%4.8 $256.69 3/15/20221,150,000 shares $238.52 million +0.9%4.3%4.5 $207.41 2/28/20221,140,000 shares $278.23 million -1.7%4.2%4.2 $244.06 2/15/20221,160,000 shares $271.17 million +1.8%4.3%4.2 $233.77 1/31/20221,140,000 shares $252.27 million +20.9%4.3%4.5 $221.29 1/15/2022943,200 shares $224.05 million +11.9%3.5%4 $237.54 12/31/2021842,900 shares $193.92 million +10.9%3.2%3.9 $230.06 12/15/2021759,800 shares $164.42 million +38.2%2.8%3.7 $216.40 11/30/2021549,800 shares $122.75 million -12.5%2.1%2.7 $223.27 11/15/2021628,100 shares $174.39 million -20.2%2.4%3.3 $277.65 10/29/2021786,800 shares $212.11 million +1.8%2.9%3.8 $269.58 10/15/2021772,800 shares $189.48 million -5.1%2.9%3.6 $245.18 9/30/2021814,200 shares $189.61 million -9.3%3.1%3.2 $232.88 9/15/2021898,100 shares $211.79 million -14.5%3.4%3.4 $235.82 8/31/20211,050,000 shares $234.74 million +18.3%3.9%4.1 $223.56 8/13/2021887,300 shares $167.46 million -20.1%3.3%3.3 $188.73 7/30/20211,110,000 shares $203.31 million +28.8%4.2%4 $183.16 7/15/2021861,600 shares $150.11 million +5.7%3.2%3.2 $174.22Altucher: Turn $900 into $108,000 in just 12 months? (Ad)We are entering the final Trump Bump of our lives. But the biggest returns will not be in the stock market.If I’m right about this (like I was before) a modest $900 investment… 6/30/2021815,400 shares $157.58 million -0.5%3.1%3.5 $193.26 6/15/2021819,500 shares $153.59 million +14.6%3.1%3.6 $187.42 5/28/2021715,100 shares $138.94 million +6.7%2.7%3.2 $194.30 5/14/2021670,100 shares $111.66 million -2.3%N/A2.8 $166.63 4/30/2021686,100 shares $165.13 million -3.8%N/A3 $240.68 4/15/2021713,200 shares $160.23 million -0.5%N/A3.3 $224.67 3/31/2021717,100 shares $140.70 million -10.9%N/A3 $196.20 3/15/2021805,200 shares $175.57 million -1.7%N/A3.2 $218.05 2/26/2021819,300 shares $185.36 million -0.8%N/A3.1 $226.24 2/12/2021826,100 shares $191.80 million +5.9%N/A3.2 $232.18 1/29/2021780,400 shares $159.59 million +4.4%N/A2.8 $204.50 1/15/2021747,800 shares $158.14 million -4.5%N/A2.5 $211.47 12/31/2020782,900 shares $148.30 million +3.8%N/A2.7 $189.43 12/15/2020754,500 shares $146.99 million -5.8%N/A2.6 $194.82 11/30/2020801,000 shares $148.18 million -29.1%N/A2.5 $184.99 11/15/20201,130,000 shares $197.37 million -18.1%N/A3.6 $174.66 10/30/20201,380,000 shares $170.97 million -10.4%N/A4.3 $123.89 10/15/20201,540,000 shares $192.28 million -11.5%N/A5.2 $124.86 9/30/20201,740,000 shares $224.55 million +17.6%N/A5.6 $129.05 9/15/20201,480,000 shares $185.37 million -3.3%N/A4.2 $125.25 8/31/20201,530,000 shares $182.76 million -13.6%N/A4.7 $119.45 8/14/20201,770,000 shares $191.27 million -6.8%N/A5.4 $108.06 7/31/20201,900,000 shares $188.78 million -7.3%N/A5.5 $99.36 7/15/20202,050,000 shares $184.44 million -12.0%N/A5.8 $89.97 6/30/20202,330,000 shares $197.19 million +24.6%N/A5.8 $84.63 6/15/20201,870,000 shares $155.90 million -4.6%N/A4.5 $83.37 5/29/20201,960,000 shares $156.80 million -11.3%N/A4.4 $80.00 5/15/20202,210,000 shares $159.72 million +10.5%N/A4.5 $72.27 4/30/20202,000,000 shares $150.52 million -21.6%N/A4.3 $75.26 4/15/20202,550,000 shares $176.74 million +25.6%N/A5.3 $69.31 INSP Short Interest - Frequently Asked Questions What is Inspire Medical Systems' current short interest? Short interest is the volume of Inspire Medical Systems shares that have been sold short but have not yet been closed out or covered. As of March 31st, investors have sold 2,920,000 shares of INSP short. 10.26% of Inspire Medical Systems' shares are currently sold short. Learn More on Inspire Medical Systems' current short interest. What is a good short interest ratio for Inspire Medical Systems? 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. INSP shares currently have a short interest ratio of 5.0. Learn More on Inspire Medical Systems's short interest ratio. Which institutional investors are shorting Inspire Medical Systems? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Inspire Medical Systems: Wolverine Trading LLC, Summit Partners Public Asset Management LLC, Millennium Management LLC, Group One Trading LLC, D. E. Shaw & Co. Inc., Cubist Systematic Strategies LLC, Caption Management LLC, Citadel Advisors LLC, Jane Street Group LLC, Tudor Investment Corp ET AL, Berger Financial Group Inc, Two Sigma Securities LLC, Concourse Financial Group Securities Inc., PEAK6 LLC, Walleye Trading LLC, Walleye Capital LLC, JPMorgan Chase & Co., and Twin Tree Management LP. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Inspire Medical Systems? 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. 10.26% of Inspire Medical Systems' floating shares are currently sold short. Is Inspire Medical Systems' short interest increasing or decreasing? Inspire Medical Systems saw a increase in short interest during the month of March. As of March 31st, there was short interest totaling 2,920,000 shares, an increase of 0.7% from the previous total of 2,900,000 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 Inspire Medical Systems' short interest compare to its competitors? 10.26% of Inspire Medical Systems' shares are currently sold short. Here is how the short interest of companies in the industry of "medical equipment" compare to Inspire Medical Systems: Solventum Co. (3.05%), Smith & Nephew plc (0.26%), Penumbra, Inc. (4.07%), Stevanato Group S.p.A. (6.05%), Glaukos Co. (6.70%), Inari Medical, Inc. (4.24%), Bausch + Lomb Co. (5.46%), Soleno Therapeutics, Inc. (13.02%), iRhythm Technologies, Inc. (9.43%), PROCEPT BioRobotics Co. (12.22%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Invesco QQQ ($21.93 billion), iShares 20+ Year Treasury Bond ETF ($9.31 billion), Strategy Incorporated ($8.42 billion), Charter Communications, Inc. ($4.52 billion), Apollo Global Management, Inc. ($4.26 billion), Super Micro Computer, Inc. ($3.98 billion), Capital One Financial Co. ($3.79 billion), TC Energy Co. ($3.43 billion), AppLovin Co. ($2.91 billion), and Schlumberger Limited ($2.89 billion). View all of the most shorted stocks. What does it mean to sell short Inspire Medical Systems stock? Short selling INSP is an investing strategy that aims to generate trading profit from Inspire Medical Systems as its price is falling. INSP shares are trading down $3.11 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 Inspire Medical Systems? A short squeeze for Inspire Medical Systems 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 INSP, which in turn drives the price of the stock up even further. How often is Inspire Medical Systems' 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 INSP, twice per month. The most recent reporting period available is March, 31 2025. More Short Interest Resources from MarketBeat Related Companies Solventum Short Interest Smith & Nephew Short Interest Penumbra Short Interest Stevanato Group Short Interest Glaukos Short Interest Inari Medical Short Interest Bausch + Lomb Short Interest Soleno Therapeutics Short Interest iRhythm Technologies Short Interest PROCEPT BioRobotics Short Interest Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NYSE:INSP) was last updated on 4/15/2025 by MarketBeat.com Staff From Our PartnersGet Your Bank Account “Fed Invasion” Ready with THESE 4 Simple StepsStarting as soon as a few months from now, the United States government will make a sweeping change to bank ac...Weiss Ratings | SponsoredElon Musk Confirms: Tesla’s Optimus is Replacing Workers… and Heading to MarsElon Musk just confirmed Tesla’s robot will go to Mars. 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