Inspire Medical Systems (INSP) Short Interest Ratio & Short Volume $95.80 +4.18 (+4.56%) Closing price 08/22/2025 03:59 PM EasternExtended Trading$96.01 +0.21 (+0.22%) As of 08/22/2025 07:41 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 2.51 million shares, representing 8.85% of the float (the number of shares available for trading by the public). This marks a -23.71% decrease in short interest from the previous month. The short interest ratio (days to cover) is 3.0, indicating that it would take 3.0 days of the average trading volume of 1.66 million shares to cover all short positions.Current Short Interest2,510,000 sharesPrevious Short Interest3,290,000 sharesChange Vs. Previous Month-23.71%Dollar Volume Sold Short$312.60 millionShort Interest Ratio3.0 Days to CoverLast Record DateJuly 31, 2025Outstanding Shares29,570,000 sharesShort Percent of Float8.85%Today's Trading Volume559,798 sharesAverage Trading Volume1,655,434 sharesToday's Volume Vs. Average34% 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 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 7/31/20252,510,000 shares $312.60 million -23.7%8.9%3 $124.54 7/15/20253,290,000 shares $420.54 million No ChangeN/A6 $127.82 6/30/20253,290,000 shares $425.33 million -3.2%11.6%6.1 $129.28 6/15/20253,400,000 shares $431.32 million +6.3%12.0%6.7 $126.86 5/31/20253,200,000 shares $441.73 million No Change11.2%6.5 $138.04 5/15/20253,200,000 shares $478.43 million +11.5%11.2%6.6 $149.51 4/30/20252,870,000 shares $454.69 million +8.3%N/A5.6 $158.43 4/15/20252,650,000 shares $388.46 million -9.3%9.3%5.5 $146.59 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 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. 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 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 $187.87What Steve Bannon revealed about Trump’s gold play (Ad)A Trump advisor just said 3 words that could reset the dollar. It’s a gold move nobody saw coming—and your IRA could be at risk. Here’s how to prepare.Download the Free Gold Protection Guide to get started now 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 $246.46 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 $277.65What Steve Bannon revealed about Trump’s gold play (Ad)A Trump advisor just said 3 words that could reset the dollar. It’s a gold move nobody saw coming—and your IRA could be at risk. Here’s how to prepare.Download the Free Gold Protection Guide to get started now 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 $174.22 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 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 covered or closed out. As of July 31st, traders have sold 2,510,000 shares of INSP short. 8.85% 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 3.0. 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: Group One Trading LLC, Jane Street Group LLC, OCONNOR A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS LLC , Walleye Capital LLC, Walleye Trading LLC, JPMorgan Chase & Co., and Simplex Trading LLC. 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. 8.85% of Inspire Medical Systems' floating shares are currently sold short. Is Inspire Medical Systems' short interest increasing or decreasing? Inspire Medical Systems saw a decrease in short interest in July. As of July 31st, there was short interest totaling 2,510,000 shares, a decrease of 23.7% from the previous total of 3,290,000 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? 8.85% 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: Penumbra, Inc. (4.07%), Stevanato Group S.p.A. (4.09%), iRhythm Technologies (7.93%), Glaukos Corporation (7.07%), Bausch + Lomb Corporation (11.11%), Soleno Therapeutics, Inc. (13.56%), TransMedics Group, Inc. (24.19%), Envista Holdings Corporation (5.69%), LivaNova PLC (4.19%), Warby Parker Inc. (9.29%), 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 ($70.87 billion), Invesco QQQ ($30.12 billion), iShares Russell 2000 ETF ($19.85 billion), iShares 20+ Year Treasury Bond ETF ($10.34 billion), Strategy Inc ($8.98 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.61 billion), SPDR S&P Biotech ETF ($6.81 billion), Invesco S&P 500 Equal Weight ETF ($6.14 billion), Palo Alto Networks, Inc. ($5.97 billion), and Super Micro Computer, Inc. ($5.28 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 up $4.18 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 increases 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 July, 31 2025. More Short Interest Resources from MarketBeat Related Companies Penumbra Short Interest Stevanato Group Short Interest iRhythm Technologies Short Interest Glaukos Short Interest Bausch + Lomb Short Interest Soleno Therapeutics Short Interest TransMedics Group Short Interest Envista Short Interest LivaNova Short Interest Warby Parker 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 8/23/2025 by MarketBeat.com Staff From Our PartnersBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. 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