Pulmonx (LUNG) Short Interest Ratio & Short Volume $1.69 +0.09 (+5.63%) Closing price 09/19/2025 04:00 PM EasternExtended Trading$1.68 -0.01 (-0.59%) As of 04:05 AM 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 InterestTrendsBuy This Stock Pulmonx Short Interest DataPulmonx (LUNG) has a short interest of 1.65 million shares, representing 4.34% of the float (the number of shares available for trading by the public). This marks a 7.14% increase in short interest from the previous month. The short interest ratio (days to cover) is 2.7, indicating that it would take 2.7 days of the average trading volume of 443,003 shares to cover all short positions.Current Short Interest1,650,000 sharesPrevious Short Interest1,540,000 sharesChange Vs. Previous Month+7.14%Dollar Volume Sold Short$2.82 millionShort Interest Ratio2.7 Days to CoverLast Record DateAugust 31, 2025Outstanding Shares40,750,000 sharesShort Percent of Float4.34%Today's Trading Volume913,296 sharesAverage Trading Volume443,003 sharesToday's Volume Vs. Average206% Short Selling Pulmonx? Sign up to receive the latest short interest report for Pulmonx and its competitors with MarketBeat's FREE newsletter. Email Address Get Report View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy. Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartLUNG Short Interest Over TimeLUNG Days to Cover Over TimeLUNG Percentage of Float Shorted Over Time Pulmonx Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 8/31/20251,650,000 shares $2.82 million +7.1%4.3%2.7 $1.71 8/15/20251,540,000 shares $2.40 million +12.4%N/A2.5 $1.56 7/31/20251,370,000 shares $2.52 million -4.9%3.6%2.6 $1.84 7/15/20251,440,000 shares $3.89 million +9.1%4.1%3.7 $2.70 6/30/20251,320,000 shares $3.42 million -7.0%3.8%3.6 $2.59 6/15/20251,420,000 shares $4.30 million +6.0%4.0%3.8 $3.03 5/31/20251,340,000 shares $4.49 million -14.1%3.8%3.6 $3.35 5/15/20251,560,000 shares $5.34 million +31.1%4.4%4.3 $3.42 4/30/20251,190,000 shares $5.75 million +1.7%3.3%3 $4.83 4/15/20251,170,000 shares $5.76 million -4.9%3.4%3.3 $4.92 Get the Latest News and Ratings for LUNG and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Pulmonx and its competitors with MarketBeat's FREE daily newsletter. 3/31/20251,230,000 shares $8.28 million +5.1%3.6%3.6 $6.73 3/15/20251,170,000 shares $8.80 million -6.4%3.4%3.8 $7.52 2/28/20251,250,000 shares $10.78 million +8.7%3.7%4 $8.62 2/15/20251,150,000 shares $8.02 million -5.7%3.4%3.9 $6.97 1/31/20251,220,000 shares $6.93 million -2.4%N/A5.5 $5.68 1/15/20251,250,000 shares $8.40 million +42.2%N/A5.4 $6.72 12/31/2024878,900 shares $5.97 million +5.7%N/A3.8 $6.79 12/15/2024831,800 shares $5.07 million +2.0%N/A3.9 $6.10 11/30/2024815,600 shares $5.26 million -3.2%N/A3.7 $6.45 11/15/2024842,700 shares $5.34 million -14.5%N/A3.6 $6.34 10/31/2024986,100 shares $6.16 million -44.6%N/A3.9 $6.25 10/15/20241,780,000 shares $12.39 million +6.0%5.0%6.2 $6.96 9/30/20241,680,000 shares $13.93 million -6.7%4.8%5.6 $8.29 9/15/20241,800,000 shares $14.96 million +13.9%5.1%5.6 $8.31 8/31/20241,580,000 shares $11.57 million +9.0%4.5%4.5 $7.32 8/15/20241,450,000 shares $8.77 million -8.2%4.1%3.9 $6.05 7/31/20241,580,000 shares $10.92 million +22.5%4.5%4.3 $6.91 7/15/20241,290,000 shares $10.01 million +7.5%3.7%3.3 $7.76 6/30/20241,200,000 shares $7.61 million -14.3%3.4%2.7 $6.34 6/15/20241,400,000 shares $8.08 million -11.4%4.0%2.8 $5.77 5/31/20241,580,000 shares $11.46 million +1.3%4.5%3.1 $7.25 5/15/20241,560,000 shares $14.54 million +10.6%4.5%2.8 $9.32 4/30/20241,410,000 shares $10.73 million -18.5%4.0%2.3 $7.61 4/15/20241,730,000 shares $12.92 million +53.1%5.0%3.1 $7.47 3/31/20241,130,000 shares $10.48 million +8.7%3.2%2.2 $9.27 3/15/20241,040,000 shares $9.31 million -17.5%3.0%2.3 $8.95 2/29/20241,260,000 shares $11.62 million No Change3.6%3.2 $9.22 2/15/20241,260,000 shares $18.37 million -18.7%3.6%3.6 $14.58 1/31/20241,550,000 shares $20.58 million -0.6%4.6%5.6 $13.28 1/15/20241,560,000 shares $19.86 million +7.6%4.6%6 $12.73 12/31/20231,450,000 shares $18.49 million +2.8%4.5%5.7 $12.75 12/15/20231,410,000 shares $17.34 million -1.4%4.4%5.8 $12.30 11/30/20231,430,000 shares $15.59 million +6.7%4.5%6 $10.90 11/15/20231,340,000 shares $14.49 million +3.1%4.2%5.9 $10.81 10/31/20231,300,000 shares $11.43 million +5.7%4.1%6.6 $8.79 10/15/20231,230,000 shares $9.83 million -3.2%3.9%5.9 $7.99 9/30/20231,270,000 shares $13.12 million +3.3%4.0%6.3 $10.33 9/15/20231,230,000 shares $12.76 million -2.4%3.9%5.8 $10.37 8/31/20231,260,000 shares $13.18 million -25.9%3.8%5.5 $10.46 8/15/20231,700,000 shares $18.97 million -16.3%5.2%7.2 $11.16 7/31/20232,030,000 shares $28.42 million +23.8%6.3%8.5 $14.00 7/15/20231,640,000 shares $22.11 million -5.2%5.1%6.5 $13.48 6/30/20231,730,000 shares $22.68 million -39.5%5.4%6.1 $13.11 6/15/20232,860,000 shares $36.64 million +19.2%8.9%9 $12.81 5/31/20232,400,000 shares $28.82 million -7.0%7.5%7 $12.01 5/15/20232,580,000 shares $33.88 million -3.0%8.0%5.5 $13.13 4/30/20232,660,000 shares $31.26 million -6.3%8.3%5.4 $11.75 4/15/20232,840,000 shares $30.96 million -7.8%8.9%5.5 $10.90 3/31/20233,080,000 shares $34.43 million +18.5%10.1%6.1 $11.18 3/15/20232,600,000 shares $29.07 million +10.2%8.5%4.8 $11.18 2/28/20232,360,000 shares $26.50 million -16.6%7.7%4.5 $11.23 2/15/20232,830,000 shares $26.43 million -7.5%9.2%5.9 $9.34 1/31/20233,060,000 shares $27.20 million +3.7%9.4%5.1 $8.89 1/15/20232,950,000 shares $26.31 million +4.6%9.1%4.3 $8.92 12/30/20222,820,000 shares $23.77 million -4.1%8.7%4.2 $8.43 12/15/20222,940,000 shares $20.99 million +2.8%9.1%4.6 $7.14 11/30/20222,860,000 shares $17.22 million +17.7%8.8%5 $6.02 11/15/20222,430,000 shares $14.68 million -25.2%7.5%4.4 $6.04 10/31/20223,250,000 shares $43.42 million -12.9%10.1%6.8 $13.36 10/15/20223,730,000 shares $51.51 million +6.9%11.5%12.1 $13.81 9/30/20223,490,000 shares $58.14 million +4.8%10.8%11.3 $16.66 9/15/20223,330,000 shares $65.77 million +5.4%10.7%9.7 $19.75 8/31/20223,160,000 shares $58.05 million +7.9%10.1%7.5 $18.37 8/15/20222,930,000 shares $65.81 million -13.1%9.4%6.3 $22.46 7/31/20223,370,000 shares $57.42 million +23.9%10.8%6.7 $17.04 7/15/20222,720,000 shares $43.41 million -6.9%8.8%5.2 $15.96 6/30/20222,920,000 shares $42.98 million +11.9%9.4%5.2 $14.72 6/15/20222,610,000 shares $39.10 million -3.3%8.4%4.8 $14.98 5/31/20222,700,000 shares $49.30 million -20.1%8.7%5.8 $18.26 5/15/20223,380,000 shares $63.24 million +9.7%10.8%6.9 $18.71 4/30/20223,080,000 shares $74.23 million +15.4%11.0%6.6 $24.10 4/15/20222,670,000 shares $72.78 million No Change9.5%6.3 $27.26 3/31/20222,670,000 shares $66.24 million -4.3%9.6%6.4 $24.81 3/15/20222,790,000 shares $59.85 million -5.1%10.0%6.6 $21.45 2/28/20222,940,000 shares $77.20 million +13.1%10.5%7.1 $26.26 2/15/20222,600,000 shares $73.68 million +6.6%9.3%6.2 $28.34 1/31/20222,440,000 shares $59.41 million +40.2%8.8%6.2 $24.35 1/15/20221,740,000 shares $48.35 million +8.8%6.6%4.5 $27.79 12/31/20211,600,000 shares $51.31 million -18.8%6.1%4.7 $32.07 12/15/20211,970,000 shares $63.41 million +16.6%7.5%5.8 $32.19 11/30/20211,690,000 shares $54.59 million +15.0%6.4%4.6 $32.30 11/15/20211,470,000 shares $56.02 million -5.2%5.6%4.3 $38.11 10/29/20211,550,000 shares $60.34 million +9.9%5.9%4.6 $38.93 10/15/20211,410,000 shares $56.13 million -2.1%5.3%4.4 $39.81 9/30/20211,440,000 shares $51.81 million +21.0%5.4%4.1 $35.98 9/15/20211,190,000 shares $46.40 million -9.9%4.5%3.1 $38.99 8/31/20211,320,000 shares $53.05 million +10.0%5.0%3.6 $40.19 8/13/20211,200,000 shares $44.09 million +7.1%4.6%3.1 $36.74 7/30/20211,120,000 shares $44.42 million +2.8%4.7%2.7 $39.66 7/15/20211,090,000 shares $41.83 million -10.7%4.5%2.4 $38.38 6/30/20211,220,000 shares $53.83 million +26.0%5.7%2.6 $44.12 6/15/2021968,000 shares $42.47 million +1.1%4.5%2 $43.87 5/28/2021957,900 shares $41.11 million -7.9%4.4%2.1 $42.92 5/14/20211,040,000 shares $39.54 million +30.2%4.9%2.4 $38.02 4/30/2021798,600 shares $37.58 million -6.3%3.8%2.1 $47.06 4/15/2021851,900 shares $37.17 million -57.0%4.1%2.9 $43.63 3/31/20211,980,000 shares $87.12 million +72.2%10.3%7.8 $44.00 3/15/20211,150,000 shares $69.51 million +18.7%6.4%5.3 $60.44 2/26/2021969,000 shares $52.33 million +5.1%5.4%4.3 $54.00 2/12/2021921,700 shares $54.80 million -32.2%5.1%4.3 $59.45 1/29/20211,360,000 shares $81.84 million -0.7%7.6%6.1 $60.18 1/15/20211,370,000 shares $81.88 million No Change7.7%6 $59.77 LUNG Short Interest - Frequently Asked Questions What is Pulmonx's current short interest? Short interest is the volume of Pulmonx shares that have been sold short but have not yet been covered or closed out. As of August 31st, investors have sold 1,650,000 shares of LUNG short. 4.34% of Pulmonx's shares are currently sold short. Learn More on Pulmonx's current short interest. What is a good short interest ratio for Pulmonx? 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. LUNG shares currently have a short interest ratio of 3.0. Learn More on Pulmonx's short interest ratio. Which institutional investors are shorting Pulmonx? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Pulmonx: Group One Trading LLC, 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 Pulmonx? 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. 4.34% of Pulmonx's floating shares are currently sold short. Is Pulmonx's short interest increasing or decreasing? Pulmonx saw a increase in short interest during the month of August. As of August 31st, there was short interest totaling 1,650,000 shares, an increase of 7.1% from the previous total of 1,540,000 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 Pulmonx's short interest compare to its competitors? 4.34% of Pulmonx's shares are currently sold short. Here is how the short interest of companies in the industry of "medical equipment" compare to Pulmonx: Perspective Therapeutics, Inc. (10.49%), Outset Medical, Inc. (11.48%), Shoulder Innovations, Inc. (4.02%), Sharps Technology, Inc. (71.65%), Monogram Orthopaedics Inc. (0.84%), Inogen, Inc (3.35%), Nano-X Imaging Ltd. (12.74%), TriSalus Life Sciences, Inc. (2.83%), InfuSystem Holdings, Inc. (0.89%), Neuronetics, Inc. (9.72%), 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 ($73.23 billion), Invesco QQQ ($29.52 billion), iShares Russell 2000 ETF ($20.82 billion), iShares 20+ Year Treasury Bond ETF ($10.76 billion), Palo Alto Networks, Inc. ($9.37 billion), Strategy Inc ($7.58 billion), Invesco S&P 500 Equal Weight ETF ($6.78 billion), SPDR S&P Biotech ETF ($6.72 billion), AppLovin Corporation ($6.37 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($6.29 billion). View all of the most shorted stocks. What does it mean to sell short Pulmonx stock? Short selling LUNG is an investing strategy that aims to generate trading profit from Pulmonx as its price is falling. LUNG shares are trading up $0.09 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 Pulmonx? A short squeeze for Pulmonx 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 LUNG, which in turn drives the price of the stock up even further. How often is Pulmonx'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 LUNG, twice per month. The most recent reporting period available is August, 31 2025. More Short Interest Resources from MarketBeat Related Companies CATX Short Interest OM Short Interest SI Short Interest STSS Short Interest MGRM Short Interest INGN Short Interest NNOX Short Interest TLSI Short Interest INFU Short Interest STIM Short Interest Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:LUNG) was last updated on 9/22/2025 by MarketBeat.com Staff From Our PartnersA New Way to Double Your Retirement Income?Bloomberg reports that a new class of investments is “entering a golden era,” with yields fueling a retail boo...Investors Alley | SponsoredPrepare for the “Mar-a-Lago Accord” Money ShockWhy Are Wall Street Insiders Moving Their Money to This ONE Asset? Something far more consequential for you...Stansberry Research | SponsoredClaim Your Share of $5.39 BILLION in AI Equity ChecksThe U.S. government just took advantage of Public Law 81-774 to crack down on AI companies... In turn, enfo...Angel Publishing | SponsoredStunning new initiative unfolding in the White House?what I just learned about what’s unfolding in the White House is truly stunning… And you need to see it for...Paradigm Press | SponsoredForget Tesla — This Tiny AI Stock Is Musk’s Real PlayWhile Wall Street focused on Tesla’s earnings, Elon Musk was quietly building a supercomputer so powerful it c...Behind the Markets | SponsoredHe Called Nvidia at $1.10. Now, He Says THIS Stock Will…The original Magnificent Seven returned 16,894%—turning $7K into $1.18 million. Now, the man who called Nvi...The Oxford Club | SponsoredWashington prepares for warWhile the headlines obsess over overseas conflicts, Washington has been quietly preparing for something much b...Porter & Company | SponsoredThis soon could be the most precious company in AmericaAI is devouring power at an unprecedented rate. Google alone expects its annual electricity bill to jump by $2...True Market Insiders | Sponsored Adding Choose a watchlist: Watchlist Adding You have already added ten stocks to your watchlist. Upgrade to MarketBeat All Access to add more stocks to your watchlist. Adding Pulmonx Corporation Please log in to your account or sign up in order to add this asset to your watchlist. Share Pulmonx With A Colleague Link copied to clipboard. Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. Real-time analyst ratings, insider transactions, earnings data, and more. Our daily ratings and market update email newsletter. Sign in to your free account to enjoy all that MarketBeat has to offer. Sign In Create Account Your Email Address: Email Address Required Your Password: Password Required Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Please enter your email address. Please enter a valid email address Choose a Password: Please enter your password. Your password must be at least 8 characters long and contain at least 1 number, 1 letter, and 1 special character. Create My Account (Free) or Sign in with Facebook Sign in with Google By creating a free account, you agree to our terms of service. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Free LUNG Stock Alerts