Inspire Medical Systems (INSP) Short Interest Ratio & Short Volume $130.16 -0.10 (-0.07%) Closing price 03:59 PM EasternExtended Trading$130.08 -0.08 (-0.06%) As of 04:20 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 3.29 million shares, representing 11.63% of the float (the number of shares available for trading by the public). This marks a -3.24% decrease in short interest from the previous month. The short interest ratio (days to cover) is 6.1, indicating that it would take 6.1 days of the average trading volume of 544,919 shares to cover all short positions.Current Short Interest3,290,000 sharesPrevious Short Interest3,400,000 sharesChange Vs. Previous Month-3.24%Dollar Volume Sold Short$425.33 millionShort Interest Ratio6.1 Days to CoverLast Record DateJune 30, 2025Outstanding Shares29,490,000 sharesShort Percent of Float11.63%Today's Trading Volume767,421 sharesAverage Trading Volume544,919 sharesToday's Volume Vs. Average141% 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 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 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 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. 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 $187.87 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 $145.76A new rule goes live in July — and the banks are quietly cashing in (Ad)A major change is quietly going into effect this July — and Wall Street is already positioning for it. Big Banks have found a way to use a new asset as if it were cash. Not stocks. Not bonds. Not even the U.S. dollar. They now trust this asset more than the traditional financial system itself.To help you get started, we're giving away a FREE Wealth Protection Guide that shows you exactly how 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 $277.65 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 $245.18A new rule goes live in July — and the banks are quietly cashing in (Ad)A major change is quietly going into effect this July — and Wall Street is already positioning for it. Big Banks have found a way to use a new asset as if it were cash. Not stocks. Not bonds. Not even the U.S. dollar. They now trust this asset more than the traditional financial system itself.To help you get started, we're giving away a FREE Wealth Protection Guide that shows you exactly how 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 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 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 June 30th, investors have sold 3,290,000 shares of INSP short. 11.63% 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 6.0. 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: Jane Street Group LLC, Millennium Management LLC, Cubist Systematic Strategies LLC, Caption Management LLC, Twin Tree Management LP, PEAK6 LLC, Walleye Trading LLC, Walleye Capital LLC, Arrowpoint Investment Partners Singapore Pte. Ltd., and Berger Financial Group Inc. 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. 11.63% of Inspire Medical Systems' floating shares are currently sold short. Is Inspire Medical Systems' short interest increasing or decreasing? Inspire Medical Systems saw a decline in short interest in the month of June. As of June 30th, there was short interest totaling 3,290,000 shares, a decline of 3.2% from the previous total of 3,400,000 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? 11.63% 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 Corporation (3.18%), Smith & Nephew SNATS, Inc. (0.59%), Penumbra, Inc. (5.12%), Stevanato Group S.p.A. (4.64%), Glaukos Corporation (9.23%), Bausch + Lomb Corporation (9.21%), Inari Medical, Inc. (4.24%), iRhythm Technologies (8.36%), Soleno Therapeutics, Inc. (12.81%), TransMedics Group, Inc. (25.56%), 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 ($72.10 billion), Invesco QQQ ($26.89 billion), iShares Russell 2000 ETF ($19.61 billion), MicroStrategy Incorporated ($9.52 billion), iShares 20+ Year Treasury Bond ETF ($8.70 billion), WD-40 Company ($7.66 billion), Technology Select Sector SPDR Fund ($6.10 billion), Invesco S&P 500 Equal Weight ETF ($5.80 billion), Invesco S&P 500 Top 50 ETF ($5.53 billion), and Vanguard Large-Cap ETF ($5.35 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 $0.10 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 June, 30 2025. More Short Interest Resources from MarketBeat Related Companies Solventum Short Interest Smith & Nephew SNATS Short Interest Penumbra Short Interest Stevanato Group Short Interest Glaukos Short Interest Bausch + Lomb Short Interest Inari Medical Short Interest iRhythm Technologies Short Interest Soleno Therapeutics Short Interest TransMedics Group 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 7/14/2025 by MarketBeat.com Staff From Our PartnersINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | SponsoredHedge fund legend humiliates Bitcoin tradersLarry Benedict made $274 million trading on Wall Street… Barron’s ranked his hedge fund in the top 1% world...Brownstone Research | SponsoredCrypto Is Pumping Again – Now Comes the Real OpportunityThis same signal has appeared twice before in the past 8 years — both times, it kicked off major moves in cryp...Crypto Swap Profits | SponsoredAn extra $1,000 per month?A little-known Title 15 provision could let you collect instant payouts — $100 to $1,000 — directly from your ...TradeSmith | SponsoredWhich Gold Miner Trades at 30% of NAV? 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