Pulmatrix (PULM) Short Interest Ratio & Short Volume $8.32 -0.13 (-1.54%) Closing price 03:58 PM EasternExtended Trading$8.35 +0.03 (+0.30%) As of 07:06 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 AnalysisChartCompetitorsEarningsHeadlinesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Pulmatrix Short Interest DataPulmatrix (PULM) has a short interest of 21,900 shares, representing 0.60% of the float (the number of shares available for trading by the public). This marks a 20.33% increase in short interest from the previous month. The short interest ratio (days to cover) is 1.2, indicating that it would take 1.2 days of the average trading volume of 133,563 shares to cover all short positions.Current Short Interest21,900 sharesPrevious Short Interest18,200 sharesChange Vs. Previous Month+20.33%Dollar Volume Sold Short$187.46 thousandShort Interest Ratio1.2 Days to CoverLast Record DateMay 31, 2025Outstanding Shares3,650,000 sharesFloat Size3,650,000 sharesShort Percent of Float0.60%Today's Trading Volume21,189 sharesAverage Trading Volume133,563 sharesToday's Volume Vs. Average16% Short Selling Pulmatrix? Sign up to receive the latest short interest report for Pulmatrix and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartPULM Short Interest Over TimePULM Days to Cover Over TimePULM Percentage of Float Shorted Over Time Pulmatrix Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/31/202521,900 shares $187.46 thousand +20.3%0.6%1.2 $8.56 5/15/202518,200 shares $118.66 thousand -23.5%0.5%0.9 $6.52 4/30/202523,800 shares $157.32 thousand -5.6%0.7%1 $6.61 4/15/202525,200 shares $136.08 thousand -31.7%0.7%0.9 $5.40 3/31/202536,900 shares $245.75 thousand -2.6%1.0%1.2 $6.66 3/15/202537,900 shares $320.63 thousand +9.5%1.0%1.1 $8.46 2/28/202534,600 shares $279.57 thousand -10.4%1.0%0.7 $8.08 2/15/202538,600 shares $298.38 thousand -27.0%1.1%0.5 $7.73 1/31/202552,900 shares $407.33 thousand +10.9%1.5%0.1 $7.70 1/15/202547,700 shares $283.34 thousand +20.8%1.3%0.1 $5.94 Get the Latest News and Ratings for PULM and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Pulmatrix and its competitors with MarketBeat's FREE daily newsletter. 12/31/202439,500 shares $275.71 thousand -47.3%1.1%0.1 $6.98 12/15/202474,900 shares $430.68 thousand +27.8%2.1%0.2 $5.75 11/30/202458,600 shares $389.10 thousand -85.8%1.6%0.1 $6.64 11/15/2024411,600 shares $2.70 million +5,697.2%11.3%1 $6.56 10/31/20247,100 shares $15.62 thousand +9.2%0.2%0.6 $2.20 10/15/20246,500 shares $13.59 thousand +27.5%0.2%0.6 $2.09 9/30/20245,100 shares $10.91 thousand -20.3%0.1%0.5 $2.14 9/15/20246,400 shares $12.86 thousand +25.5%0.2%0.5 $2.01 8/31/20245,100 shares $10.56 thousand -37.0%0.1%0.5 $2.07 8/15/20248,100 shares $17.24 thousand -31.4%0.2%0.7 $2.13 7/31/202411,800 shares $25.61 thousand +126.9%0.3%1.1 $2.17 7/15/20245,200 shares $10.68 thousand +372.7%0.1%0.5 $2.05 6/30/20241,100 shares $2.12 thousand +120.0%0.0%0.1 $1.93 6/15/2024500 shares $958.85 -77.3%0.0%0 $1.92 5/31/20242,200 shares $4.11 thousand +450.0%0.1%0.2 $1.87 5/15/2024400 shares $732.00 -86.2%0.0%0 $1.83 4/30/20242,900 shares $5.51 thousand -74.8%0.1%0.2 $1.90 4/15/202411,500 shares $24.04 thousand +325.9%0.3%0.7 $2.09 3/31/20242,700 shares $4.73 thousand +575.0%0.1%0.2 $1.75 3/15/2024400 shares $672.00 -97.4%0.0%0 $1.68 2/29/202415,300 shares $30.45 thousand +91.3%0.4%0.9 $1.99 2/15/20248,000 shares $14.72 thousand +27.0%0.2%0.4 $1.84 1/31/20246,300 shares $10.90 thousand +350.0%0.2%0.4 $1.73 1/15/20241,400 shares $2.74 thousand -68.2%0.0%0.1 $1.96 12/31/20234,400 shares $8.18 thousand -44.3%0.1%0.3 $1.86 12/15/20237,900 shares $14.93 thousand +27.4%0.2%0.6 $1.89 11/30/20236,200 shares $12.77 thousand +195.2%0.2%0.6 $2.06 11/15/20232,100 shares $3.78 thousand -38.2%0.1%0.2 $1.80 10/31/20233,400 shares $6.43 thousand -12.8%0.1%0.3 $1.89 10/15/20233,900 shares $7.93 thousand -20.4%0.1%0.3 $2.03Utah’s New Oil Find (Ad)The Real Reason 218,000 Acres Just Vanished The government just quietly leased 218,000 acres in the middle of the Utah's Black Desert. 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Google, Buffett, and a even tech billionaires like Gates, Bezos, and Zuckerberg are grabbing a stake.Find out why this could be the most lucrative "underground" energy story in America 9/30/20234,900 shares $9.95 thousand +14.0%0.1%0.4 $2.03 9/15/20234,300 shares $9.85 thousand +59.3%0.1%0.3 $2.29 8/31/20232,700 shares $6.35 thousand -20.6%0.1%0.2 $2.35 8/15/20233,400 shares $8.55 thousand +88.9%0.1%0.2 $2.52 7/31/20231,800 shares $4.77 thousand -45.5%0.1%0.1 $2.65 7/15/20233,300 shares $8.94 thousand -41.1%0.1%0.2 $2.71 6/30/20235,600 shares $15.01 thousand -47.2%0.2%0.4 $2.68 6/15/202310,600 shares $29.36 thousand +120.8%0.3%0.7 $2.77 5/31/20234,800 shares $13.10 thousand +29.7%0.1%0.3 $2.73 5/15/20233,700 shares $9.95 thousand +184.6%0.1%0.2 $2.69 4/30/20231,300 shares $3.82 thousand -55.2%0.0%0.1 $2.94 4/15/20232,900 shares $8.61 thousand No Change0.1%0.1 $2.97 3/31/20232,900 shares $8.47 thousand -64.2%0.1%0.1 $2.92 3/15/20238,100 shares $25.27 thousand -13.8%0.2%0.2 $3.12 2/28/20239,400 shares $32.43 thousand -36.5%0.3%0.2 $3.45 2/15/202314,800 shares $55.50 thousand -56.7%0.4%0.4 $3.75 1/31/202334,200 shares $137.83 thousand -24.7%0.9%0.9 $4.03 1/15/202345,400 shares $196.58 thousand +17.0%1.3%1.2 $4.33 12/30/202238,800 shares $150.54 thousand -7.2%1.1%1 $3.88 12/15/202241,800 shares $156.33 thousand +3.0%1.2%2 $3.74 11/30/202240,600 shares $151.84 thousand -21.2%1.1%1.7 $3.74 11/15/202251,500 shares $201.88 thousand -1.9%1.4%0.6 $3.92 10/31/202252,500 shares $180.60 thousand -19.9%1.6%0.6 $3.44 10/15/202265,500 shares $235.15 thousand -24.2%1.9%0.5 $3.59 9/30/202286,400 shares $308.45 thousand -17.2%2.6%0.7 $3.57 9/15/2022104,400 shares $463.54 thousand -28.4%3.1%0.8 $4.44 8/31/2022145,700 shares $643.99 thousand +840.0%4.3%1.2 $4.42 8/15/202215,500 shares $73.63 thousand -1.3%0.5%0.2 $4.75 7/31/202215,700 shares $69.08 thousand +36.5%0.5%0.3 $4.40 7/15/202211,500 shares $52.44 thousand +6.5%0.3%0.7 $4.56 6/30/202210,800 shares $49.57 thousand -44.0%0.3%0.7 $4.59 6/15/202219,300 shares $85.69 thousand +10.3%0.6%1 $4.44 5/31/202217,500 shares $94.50 thousand -23.3%0.5%0.6 $5.40 5/15/202222,800 shares $117.19 thousand -17.7%0.7%0.5 $5.14 4/30/202227,700 shares $141.55 thousand -74.4%0.8%0.6 $5.11 4/15/2022108,000 shares $640.44 thousand -20.0%3.3%2.1 $5.93 3/31/2022135,000 shares $922.05 thousand +40.5%4.1%2.5 $6.83 3/15/202296,100 shares $580.44 thousand +359.8%3.0%1.4 $6.04 2/28/202220,900 shares $129.16 thousand -92.1%0.6%0.3 $6.18 2/15/2022265,900 shares $96.79 thousand -20.7%N/A0.2 $0.36 1/31/2022335,400 shares $132.48 thousand -23.1%N/A0.3 $0.40 1/15/2022436,400 shares $174.12 thousand -80.6%0.8%0.4 $0.40 12/31/20212,250,000 shares $985.50 thousand +162.2%4.1%2 $0.44 12/15/2021858,100 shares $416.18 thousand -16.7%1.6%0.9 $0.49 11/30/20211,030,000 shares $687.01 thousand -20.2%1.9%1.9 $0.67 11/15/20211,290,000 shares $1.05 million +1.6%2.3%2.5 $0.81 10/29/20211,270,000 shares $1.10 million +9.5%2.3%2.7 $0.87 10/15/20211,160,000 shares $842.16 thousand -4.9%2.1%4.3 $0.73 9/30/20211,220,000 shares $976 thousand +6.1%2.2%4 $0.80 9/15/20211,150,000 shares $888.95 thousand +9.5%2.1%3.5 $0.77Market Panic: Trump Just Dropped a Bomb on Your Stocks (Ad)tock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tariffs just lit the fuse. 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Get the FREE Guide Before Markets Open Tomorrow 8/31/20211,050,000 shares $860.90 thousand +13.8%1.9%2.8 $0.82 8/13/2021922,900 shares $719.86 thousand +13.7%1.7%2 $0.78 7/30/2021811,900 shares $685.89 thousand +28.4%1.5%1.5 $0.84 7/15/2021632,500 shares $548.57 thousand -14.3%1.1%1 $0.87 6/30/2021737,600 shares $767.10 thousand -2.1%1.3%0.9 $1.04 6/15/2021753,400 shares $768.47 thousand -9.3%1.4%0.9 $1.02 5/28/2021830,600 shares $772.87 thousand -17.8%1.5%0.8 $0.93 5/14/20211,010,000 shares $839.11 thousand -8.2%N/A0.7 $0.83 4/30/20211,100,000 shares $1.11 million +39.4%N/A0.4 $1.01 4/15/2021788,900 shares $812.57 thousand -37.9%N/A0.3 $1.03 3/31/20211,270,000 shares $1.65 million -8.6%N/A0.5 $1.30 3/15/20211,390,000 shares $2.10 million +3.7%N/A0.5 $1.51 2/26/20211,340,000 shares $2.18 million +28.9%N/A0.6 $1.63 2/12/20211,040,000 shares $2.09 million +1,014.7%N/A0.5 $2.01 1/29/202193,300 shares $137.15 thousand +148.1%N/A0.1 $1.47 1/15/202137,600 shares $47.75 thousand -83.7%N/A0.1 $1.27 12/31/2020230,900 shares $277.08 thousand +162.4%N/A0.4 $1.20 12/15/202088,000 shares $116.16 thousand -66.3%N/A0.2 $1.32 11/30/2020261,400 shares $334.59 thousand +187.9%N/A0.6 $1.28 11/15/202090,800 shares $103.51 thousand -73.9%N/A0.2 $1.14 10/30/2020348,100 shares $362.02 thousand +56.7%N/A0.8 $1.04 10/15/2020222,100 shares $257.64 thousand +87.7%N/A0.4 $1.16 9/30/2020118,300 shares $140.78 thousand +20.8%N/A0.2 $1.19 9/15/202097,900 shares $116.50 thousand -6.1%N/A0.1 $1.19 8/31/2020104,300 shares $111.60 thousand -53.7%N/A0.1 $1.07 8/14/2020225,100 shares $263.37 thousand -59.7%N/A0.3 $1.17 7/31/2020558,800 shares $737.62 thousand +61.7%N/A0.6 $1.32 7/15/2020345,600 shares $463.10 thousand -79.4%N/A0.3 $1.34 6/30/20201,680,000 shares $2.89 million +22.6%N/A1.4 $1.72 6/15/20201,370,000 shares $2.11 million -8.7%N/A1.2 $1.54 PULM Short Interest - Frequently Asked Questions What is Pulmatrix's current short interest? Short interest is the volume of Pulmatrix shares that have been sold short but have not yet been closed out or covered. As of May 31st, traders have sold 21,900 shares of PULM short. 0.60% of Pulmatrix's shares are currently sold short. Learn More on Pulmatrix's current short interest. What is a good short interest ratio for Pulmatrix? 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. PULM shares currently have a short interest ratio of 1.0. Learn More on Pulmatrix's short interest ratio. What is a good short interest percentage for Pulmatrix? 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. 0.60% of Pulmatrix's floating shares are currently sold short. Is Pulmatrix's short interest increasing or decreasing? Pulmatrix saw a increase in short interest in May. As of May 31st, there was short interest totaling 21,900 shares, an increase of 20.3% from the previous total of 18,200 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. What is Pulmatrix's float size? Pulmatrix currently has issued a total of 3,650,000 shares. Some of Pulmatrix's outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. Pulmatrix currently has a public float of 3,650,000 shares. How does Pulmatrix's short interest compare to its competitors? 0.60% of Pulmatrix's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Pulmatrix: RAPT Therapeutics, Inc. (18.41%), Nkarta, Inc. (10.91%), Neumora Therapeutics, Inc. (23.03%), Theratechnologies Inc. (1.28%), Contineum Therapeutics, Inc. (4.45%), Kyverna Therapeutics, Inc. (10.74%), Atossa Therapeutics, Inc. (6.56%), Invivyd, Inc. (8.50%), Procaps Group S.A. (0.12%), Sagimet Biosciences Inc. (15.50%), 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 ($64.96 billion), Invesco QQQ ($27.88 billion), iShares Russell 2000 ETF ($19.94 billion), iShares 20+ Year Treasury Bond ETF ($9.69 billion), Strategy Incorporated ($8.58 billion), SPDR S&P Biotech ETF ($5.72 billion), Invesco S&P 500 Equal Weight ETF ($5.45 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.70 billion), Charter Communications, Inc. ($4.54 billion), and Industrial Select Sector SPDR Fund ($4.49 billion). View all of the most shorted stocks. What does it mean to sell short Pulmatrix stock? Short selling PULM is an investing strategy that aims to generate trading profit from Pulmatrix as its price is falling. PULM shares are trading down $0.13 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 Pulmatrix? A short squeeze for Pulmatrix 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 PULM, which in turn drives the price of the stock up even further. How often is Pulmatrix'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 PULM, twice per month. The most recent reporting period available is May, 31 2025. More Short Interest Resources from MarketBeat Related Companies RAPT Short Interest Data NKTX Short Interest Data NMRA Short Interest Data THTX Short Interest Data CTNM Short Interest Data KYTX Short Interest Data ATOS Short Interest Data IVVD Short Interest Data PROC Short Interest Data SGMT Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:PULM) was last updated on 6/11/2025 by MarketBeat.com Staff From Our PartnersUtah’s New Oil FindThe Real Reason 218,000 Acres Just Vanished The government just quietly leased 218,000 acres in the middle ...Stansberry Research | SponsoredTrump wipes out trillions overnight…Is there anybody more powerful than Donald Trump right now? In a single tariff announcement, he wiped out n...Porter & Company | SponsoredElon’s NEXT Big IPO?Cancel your internet TODAY!? 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