Penumbra (PEN) Short Interest Ratio & Short Volume $250.54 +0.80 (+0.32%) Closing price 07/3/2025 03:53 PM EasternExtended Trading$250.54 0.00 (0.00%) As of 07/3/2025 04:08 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 Penumbra Short Interest DataPenumbra (PEN) has a short interest of 1.52 million shares, representing 4.10% of the float (the number of shares available for trading by the public). This marks a 17.83% increase in short interest from the previous month. The short interest ratio (days to cover) is 2.9, indicating that it would take 2.9 days of the average trading volume of 453,066 shares to cover all short positions.Current Short Interest1,520,000 sharesPrevious Short Interest1,290,000 sharesChange Vs. Previous Month+17.83%Dollar Volume Sold Short$389.58 millionShort Interest Ratio2.9 Days to CoverLast Record DateJune 15, 2025Outstanding Shares38,730,000 sharesShort Percent of Float4.10%Today's Trading Volume233,847 sharesAverage Trading Volume453,066 sharesToday's Volume Vs. Average52% Short Selling Penumbra? Sign up to receive the latest short interest report for Penumbra and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartPEN Short Interest Over TimePEN Days to Cover Over TimePEN Percentage of Float Shorted Over Time Penumbra Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 6/15/20251,520,000 shares $389.58 million +17.8%4.1%2.9 $256.30 5/31/20251,290,000 shares $344.82 million -14.6%3.5%2.5 $267.30 5/15/20251,510,000 shares $416.68 million -2.0%4.1%3 $275.95 4/30/20251,540,000 shares $450.23 million -1.9%N/A3.1 $292.36 4/15/20251,570,000 shares $427.20 million +5.4%4.3%3.2 $272.10 3/31/20251,490,000 shares $399.08 million +22.1%4.1%3 $267.84 3/15/20251,220,000 shares $333.69 million -10.3%3.3%2.6 $273.51 2/28/20251,360,000 shares $388.09 million -19.1%3.7%3 $285.36 2/15/20251,680,000 shares $449.95 million +17.5%4.6%3.9 $267.83 1/31/20251,430,000 shares $382.06 million -23.5%N/A3.7 $267.17 Get the Latest News and Ratings for PEN and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Penumbra and its competitors with MarketBeat's FREE daily newsletter. 1/15/20251,870,000 shares $490.44 million +1.6%N/A4.8 $262.27 12/31/20241,840,000 shares $436.96 million +3.4%N/A5.1 $237.48 12/15/20241,780,000 shares $437.08 million -3.8%N/A5.2 $245.55 11/30/20241,850,000 shares $451.62 million -3.7%N/A5.3 $244.12 11/15/20241,920,000 shares $456.29 million -15.0%N/A5.2 $237.65 10/31/20242,260,000 shares $517.54 million -14.7%N/A5.5 $229.00 10/15/20242,650,000 shares $547.68 million +17.3%N/A5.9 $206.67 9/30/20242,260,000 shares $439.07 million -14.1%N/A4.9 $194.28 9/15/20242,630,000 shares $491.65 million +8.7%N/A5.6 $186.94 8/31/20242,420,000 shares $489.61 million -12.3%N/A5.2 $202.32 8/15/20242,760,000 shares $522.36 million +20.5%N/A6.1 $189.26 7/31/20242,290,000 shares $382.64 million -8.8%N/A5.5 $167.09 7/15/20242,510,000 shares $481.12 million No ChangeN/A7.2 $191.68 6/30/20242,510,000 shares $451.72 million +5.9%N/A7.6 $179.97 6/15/20242,370,000 shares $445.04 million +7.2%N/A6.8 $187.78 5/31/20242,210,000 shares $418.75 million +14.5%N/A6.4 $189.48 5/15/20241,930,000 shares $395.15 million -9.4%N/A5.3 $204.74 4/30/20242,130,000 shares $418.20 million +9.8%N/A5.7 $196.34 4/15/20241,940,000 shares $407.73 million +0.5%N/A5.7 $210.17 3/31/20241,930,000 shares $430.74 million -2.0%N/A5.6 $223.18 3/15/20241,970,000 shares $437.38 million No ChangeN/A5.8 $222.02 2/29/20241,970,000 shares $462.47 million -9.6%N/A6.1 $234.76 2/15/20242,180,000 shares $595.72 million +0.5%N/A6.8 $273.27 1/31/20242,170,000 shares $547.25 million +3.8%N/A6 $252.19 1/15/20242,090,000 shares $540.04 million -1.9%N/A5.3 $258.39 12/31/20232,130,000 shares $535.78 million -5.8%N/A5.1 $251.54 12/15/20232,260,000 shares $554.78 million -2.2%N/A5.5 $245.48 11/30/20232,310,000 shares $513.00 million -7.6%N/A5.4 $222.08 11/15/20232,500,000 shares $569.69 million +4.6%N/A5.9 $227.88 10/31/20232,390,000 shares $457.21 million +0.8%N/A6.3 $191.30379 passengers walked away from this (Ad)Why Elon Musk Just Invested $51 Million Into Brand New “Miracle Metal” Developed by MIT Scientists[See The Details Here] 10/15/20232,370,000 shares $465.52 million +5.3%N/A6.1 $196.42 9/30/20232,250,000 shares $544.30 million +0.5%N/A5.8 $241.91 9/15/20232,240,000 shares $599.42 million +1.8%N/A5.8 $267.60 8/31/20232,200,000 shares $582.18 million +2.8%N/A5.6 $264.63 8/15/20232,140,000 shares $556.40 million -18.9%N/A5.7 $260.00 7/31/20232,640,000 shares $800.69 million -17.8%N/A7 $303.29 7/15/20233,210,000 shares $1.01 billion -8.6%N/A8.6 $314.93 6/30/20233,510,000 shares $1.21 billion -2.0%N/A9.9 $344.16 6/15/20233,580,000 shares $1.21 billion +5.3%N/A10.2 $338.28 5/31/20233,400,000 shares $1.04 billion -0.6%N/A9.9 $307.34 5/15/20233,420,000 shares $1.08 billion -11.9%N/A9.2 $314.92 4/30/20233,880,000 shares $1.10 billion -0.5%N/A10.8 $284.12 4/15/20233,900,000 shares $1.08 billion -3.9%10.8%12.1 $277.62 3/31/20234,060,000 shares $1.13 billion +1.0%11.3%12.3 $278.69 3/15/20234,020,000 shares $1.03 billion -3.8%11.1%12.5 $257.00 2/28/20234,180,000 shares $1.09 billion +4.0%11.7%12.3 $259.99 2/15/20234,020,000 shares $1.06 billion +5.0%11.2%11.8 $264.19 1/31/20233,830,000 shares $959.07 million +2.1%10.7%11.3 $250.41 1/15/20233,750,000 shares $891.68 million -0.5%10.5%10 $237.78 12/30/20223,770,000 shares $838.67 million +5.3%10.5%10.3 $222.46 12/15/20223,580,000 shares $801.24 million +9.2%10.0%9.9 $223.81 11/30/20223,280,000 shares $687.19 million +5.8%9.0%8.6 $209.51 11/15/20223,100,000 shares $607.57 million +10.7%8.5%8.6 $195.99 10/31/20222,800,000 shares $480.12 million +18.1%7.7%7.9 $171.47 10/15/20222,370,000 shares $426.46 million +2.2%6.6%7 $179.94 9/30/20222,320,000 shares $439.87 million +6.4%6.5%6 $189.60 9/15/20222,180,000 shares $441.76 million +4.3%6.1%5.5 $202.64 8/31/20222,090,000 shares $343.12 million +2.0%5.8%5.2 $164.17 8/15/20222,050,000 shares $358.11 million +0.5%5.7%5.4 $174.69 7/31/20222,040,000 shares $284.34 million -8.5%5.7%4.9 $139.38 7/15/20222,230,000 shares $273.18 million -0.5%6.3%5.8 $122.50 6/30/20222,240,000 shares $278.92 million +22.4%6.3%6.8 $124.52 6/15/20221,830,000 shares $223.46 million +18.8%5.1%5.5 $122.11 5/31/20221,540,000 shares $226.26 million +3.4%4.3%5.2 $146.92 5/15/20221,490,000 shares $213.44 million -10.2%4.2%5.4 $143.25 4/30/20221,660,000 shares $286.45 million -4.6%4.7%7 $172.56 4/15/20221,740,000 shares $344.07 million +1.2%4.9%8.2 $197.74 3/31/20221,720,000 shares $382.06 million +0.6%4.8%8.2 $222.13 3/15/20221,710,000 shares $326.70 million +2.4%4.8%9.3 $191.05 2/28/20221,670,000 shares $370.31 million +1.2%4.7%8.6 $221.74 2/15/20221,650,000 shares $382.09 million +2.5%4.6%8.8 $231.57 1/31/20221,610,000 shares $363.88 million -4.7%4.6%9.3 $226.01 1/15/20221,690,000 shares $401.51 million -2.9%4.8%9.9 $237.58 12/31/20211,740,000 shares $499.94 million -7.0%4.9%11.7 $287.32 12/15/20211,870,000 shares $474.87 million +21.4%5.3%13.1 $253.94 11/30/20211,540,000 shares $378.30 million +1.3%4.4%11 $245.65 11/15/20211,520,000 shares $391.35 million -13.6%4.3%10.6 $257.47 10/29/20211,760,000 shares $486.73 million -3.8%5.1%11.1 $276.55 10/15/20211,830,000 shares $489.98 million +5.8%5.3%11.3 $267.75 9/30/20211,730,000 shares $461.05 million +6.8%5.0%10.3 $266.50379 passengers walked away from this (Ad)Why Elon Musk Just Invested $51 Million Into Brand New “Miracle Metal” Developed by MIT Scientists[See The Details Here] 9/15/20211,620,000 shares $467.99 million -1.8%4.7%9.6 $288.88 8/31/20211,650,000 shares $453.67 million -1.2%4.8%9.4 $274.95 8/13/20211,670,000 shares $430.29 million -3.5%4.9%8.1 $257.66 7/30/20211,730,000 shares $460.58 million +2.4%5.1%7.5 $266.23 7/15/20211,690,000 shares $423.72 million -2.3%4.9%7.1 $250.72 6/30/20211,730,000 shares $474.12 million -9.9%5.1%7.2 $274.06 6/15/20211,920,000 shares $530.44 million -6.8%5.6%7.4 $276.27 5/28/20212,060,000 shares $513.17 million -9.3%6.0%7.7 $249.11 5/14/20212,270,000 shares $546.62 million -13.0%6.6%8.2 $240.80 4/30/20212,610,000 shares $808.55 million -4.0%7.6%9.2 $309.79 4/15/20212,720,000 shares $756.81 million -2.2%8.0%7 $278.24 3/31/20212,780,000 shares $721.05 million -3.1%8.2%6.2 $259.37 3/15/20212,870,000 shares $799.98 million -5.9%8.4%5.4 $278.74 2/26/20213,050,000 shares $868.34 million -8.1%8.9%3.9 $284.70 2/12/20213,320,000 shares $908.48 million -9.3%9.8%4.1 $273.64 1/29/20213,660,000 shares $965.29 million -39.6%10.8%4.4 $263.74 1/15/20216,060,000 shares $1.41 billion +2.2%17.8%7.2 $233.04 12/31/20205,930,000 shares $1.05 billion +6.3%17.5%7.8 $176.91 12/15/20205,580,000 shares $1.06 billion +23.2%16.4%7.7 $189.64 11/30/20204,530,000 shares $1.03 billion -1.3%13.3%7.2 $226.59 11/15/20204,590,000 shares $1.21 billion -0.4%13.5%10.1 $262.81 10/30/20204,610,000 shares $1.22 billion -3.0%13.6%10.9 $264.18 10/15/20204,750,000 shares $977.55 million +25.0%14.1%13.1 $205.80 9/30/20203,800,000 shares $738.64 million +21.4%11.3%11.3 $194.38 9/15/20203,130,000 shares $619.36 million +11.0%9.3%10.1 $197.88 8/31/20202,820,000 shares $589.80 million +19.0%8.4%10.5 $209.15 8/14/20202,370,000 shares $553.66 million -8.9%7.0%9.8 $233.61 7/31/20202,600,000 shares $614.41 million -6.5%7.8%10.5 $236.31 7/15/20202,780,000 shares $519.64 million -6.1%8.3%11.8 $186.92 PEN Short Interest - Frequently Asked Questions What is Penumbra's current short interest? Short interest is the volume of Penumbra shares that have been sold short but have not yet been closed out or covered. As of June 15th, investors have sold 1,520,000 shares of PEN short. 4.10% of Penumbra's shares are currently sold short. Learn More on Penumbra's current short interest. What is a good short interest ratio for Penumbra? 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. PEN shares currently have a short interest ratio of 3.0. Learn More on Penumbra's short interest ratio. Which institutional investors are shorting Penumbra? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Penumbra: PEAK6 LLC, Walleye Trading LLC, Walleye Capital LLC, and Arrowpoint Investment Partners Singapore Pte. Ltd.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Penumbra? 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. 4.10% of Penumbra's floating shares are currently sold short. Is Penumbra's short interest increasing or decreasing? Penumbra saw a increase in short interest during the month of June. As of June 15th, there was short interest totaling 1,520,000 shares, an increase of 17.8% from the previous total of 1,290,000 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 Penumbra's short interest compare to its competitors? 4.10% of Penumbra's shares are currently sold short. Here is how the short interest of companies compare to Penumbra: Lantheus Holdings, Inc. (13.60%), Integer Holdings Corporation (6.39%), GE HealthCare Technologies Inc. (1.40%), Koninklijke Philips N.V. (0.32%), Zimmer Biomet Holdings, Inc. (3.25%), Smith & Nephew SNATS, Inc. (0.57%), Solventum Corporation (3.03%), Stevanato Group S.p.A. (4.74%), Glaukos Corporation (7.39%), iRhythm Technologies (8.17%), 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 ($69.26 billion), Invesco QQQ ($25.22 billion), iShares Russell 2000 ETF ($20.33 billion), iShares 20+ Year Treasury Bond ETF ($9.99 billion), MicroStrategy Incorporated ($9.12 billion), Canadian Natural Resources Limited ($6.73 billion), SPDR S&P Biotech ETF ($6.52 billion), Invesco S&P 500 Equal Weight ETF ($5.60 billion), Financial Select Sector SPDR Fund ($4.64 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.59 billion). View all of the most shorted stocks. What does it mean to sell short Penumbra stock? Short selling PEN is an investing strategy that aims to generate trading profit from Penumbra as its price is falling. PEN shares are trading up $0.80 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 Penumbra? A short squeeze for Penumbra 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 PEN, which in turn drives the price of the stock up even further. How often is Penumbra'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 PEN, twice per month. The most recent reporting period available is June, 15 2025. 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