X4 Pharmaceuticals (XFOR) Short Interest Ratio & Short Volume $3.50 -0.14 (-3.85%) Closing price 04:00 PM EasternExtended Trading$3.49 -0.01 (-0.29%) As of 05:23 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 ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock X4 Pharmaceuticals Short Interest DataX4 Pharmaceuticals (XFOR) has a short interest of 2.47 million shares, representing 17.28% of the float (the number of shares available for trading by the public). This marks a 142.16% increase in short interest from the previous month. The short interest ratio (days to cover) is 0.6, indicating that it would take 0.6 days of the average trading volume of 1.64 million shares to cover all short positions.Current Short Interest2,470,000 sharesPrevious Short Interest1,020,000 sharesChange Vs. Previous Month+142.16%Dollar Volume Sold Short$7.04 millionShort Interest Ratio0.6 Days to CoverLast Record DateAugust 15, 2025Outstanding Shares11,410,000 sharesFloat Size14,290,000 sharesShort Percent of Float17.28%Today's Trading Volume540,169 sharesAverage Trading Volume1,635,431 sharesToday's Volume Vs. Average33% Short Selling X4 Pharmaceuticals? Sign up to receive the latest short interest report for X4 Pharmaceuticals and its competitors with MarketBeat's FREE newsletter. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartXFOR Short Interest Over TimeXFOR Days to Cover Over TimeXFOR Percentage of Float Shorted Over Time X4 Pharmaceuticals Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 8/15/20252,470,000 shares $7.04 million +142.2%17.3%0.6 $2.85 7/31/20251,020,000 shares $1.71 million +161.3%26.2%1.2 $1.68 7/15/2025390,400 shares $573.89 thousand +34.3%10.2%0.6 $1.47 6/30/2025290,800 shares $552.52 thousand -40.0%5.1%0.7 $1.90 6/15/2025484,800 shares $1.37 million +22.2%12.6%2.3 $2.82 5/31/2025396,900 shares $1.34 million +27.1%10.3%2.5 $3.37 5/15/2025312,300 shares $943.15 thousand +7.4%8.1%2.9 $3.02 4/30/2025290,700 shares $1.25 million -96.7%7.6%3.4 $4.31 4/15/20258,800,000 shares $54.91 million +8.9%5.2%2.7 $6.24 3/31/20258,080,000 shares $1.91 million -6.5%4.8%2.3 $0.24 Get the Latest News and Ratings for XFOR and Related StocksEnter your email address below to receive the latest news and analysts' ratings for X4 Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 3/15/20258,640,000 shares $2.94 million -8.9%5.1%2.4 $0.34 2/28/20259,480,000 shares $3.75 million -14.3%5.7%2.3 $0.40 2/15/202511,060,000 shares $5.62 million -33.4%6.6%2.7 $0.51 1/31/202516,610,000 shares $11.63 million +22.6%N/A3.1 $0.70 1/15/202513,550,000 shares $6.25 million +1.4%N/A3.7 $0.46 12/31/202413,360,000 shares $9.80 million +1.2%N/A3.9 $0.73 12/15/202413,200,000 shares $8.85 million +5.6%N/A4.2 $0.67 11/30/202412,500,000 shares $4.91 million -3.4%N/A4.6 $0.39 11/15/202412,940,000 shares $5.22 million +13.3%N/A5.5 $0.40 10/31/202411,420,000 shares $5.71 million -9.8%N/A10.6 $0.50 10/15/202412,660,000 shares $7.05 million -6.6%N/A11.6 $0.56 9/30/202413,560,000 shares $9.08 million -0.4%N/A11.4 $0.67 9/30/2024370,900 shares $537.81 thousand -1.5%7.2%0.2 $1.45 9/15/202413,620,000 shares $9.67 million -10.6%N/A7.4 $0.71 9/15/2024376,600 shares $636.45 thousand +19.4%7.3%0.1 $1.69 8/31/202415,230,000 shares $10.66 million -0.9%N/A8 $0.70 8/31/2024315,500 shares $542.66 thousand -36.9%6.1%0.1 $1.72 8/15/202415,370,000 shares $9.72 million +4.4%N/A7.7 $0.63 8/15/2024499,900 shares $689.86 thousand +7.5%9.6%0.1 $1.38 7/31/202414,720,000 shares $11.78 million -10.8%N/A6.7 $0.80 7/31/2024464,900 shares $702.00 thousand -37.7%9.2%0.1 $1.51 7/15/202416,510,000 shares $11.71 million +19.0%N/A5.5 $0.71 7/15/2024745,900 shares $1.52 million +78.3%14.8%0.2 $2.04 6/30/202413,880,000 shares $8.05 million +16.4%N/A4.4 $0.58 6/30/2024418,300 shares $966.27 thousand +10.1%7.3%0.1 $2.31 6/15/202411,920,400 shares $12.16 million +0.3%N/A4.3 $1.02 6/15/2024380,100 shares $513.14 thousand +164.0%8.2%0.1 $1.35 5/31/202411,880,000 shares $12.00 million -2.7%N/A3.6 $1.01 5/31/2024144,000 shares $62.78 thousand +211.7%3.6%0.1 $0.44 5/15/202412,210,000 shares $11.92 million -7.4%N/A3.7 $0.98 5/15/202446,200 shares $24.22 thousand +974.4%1.5%0.2 $0.52 4/30/202413,190,000 shares $14.77 million +7.6%N/A4.2 $1.12 4/30/20244,300 shares $3.35 thousand -59.4%0.2%0.1 $0.78 4/15/202412,260,000 shares $15.33 million -0.6%N/A5.1 $1.25 4/15/202410,600 shares $7.69 thousand -47.5%0.4%0.6 $0.73 3/31/202412,330,000 shares $17.14 million -13.3%N/A5.8 $1.39 3/31/202420,200 shares $20.81 thousand -14.4%0.8%0.6 $1.03 3/15/202414,220,000 shares $13.19 million -1.3%N/A7.4 $0.93 3/15/202423,600 shares $24.31 thousand -37.4%1.0%0.4 $1.03 2/29/202414,400,000 shares $13.98 million +8.8%N/A8.1 $0.97 2/29/202437,700 shares $41.47 thousand -29.8%1.6%0.5 $1.10 2/15/202413,230,000 shares $12.52 million +3.4%N/A6.6 $0.95 2/15/202453,700 shares $62.83 thousand -33.3%2.3%0.6 $1.17 1/31/202412,800,000 shares $10.00 million +6.8%N/A6.1 $0.78 1/31/202480,500 shares $90.97 thousand +27.6%3.4%1 $1.13 1/15/202411,990,000 shares $9.83 million +3.2%N/A5.2 $0.82 1/15/202463,100 shares $78.88 thousand +102.2%2.7%0.7 $1.25 12/31/202311,620,000 shares $9.74 million -1.0%N/A5.1 $0.84 12/31/202331,200 shares $34.94 thousand -12.1%1.3%0.4 $1.12 12/15/202311,740,000 shares $8.38 million +2.8%N/A5.2 $0.71 12/15/202335,500 shares $42.96 thousand -33.2%1.5%0.4 $1.21 11/30/202311,420,000 shares $8.91 million -0.3%N/A6.2 $0.78 11/30/202353,100 shares $66.38 thousand -7.8%2.3%0.5 $1.25 11/15/202311,450,000 shares $9.00 million -0.5%N/A7.5 $0.79 11/15/202357,600 shares $65.09 thousand -26.7%2.5%0.5 $1.13 10/31/202311,510,000 shares $9.21 million +5.8%N/A5.5 $0.80 10/31/202378,600 shares $92.75 thousand +35.1%4.8%0.4 $1.18 10/15/202310,880,000 shares $9.70 million +2.5%N/A5.7 $0.89 10/15/202358,200 shares $68.68 thousand -61.1%3.6%0.2 $1.18 9/30/202310,620,000 shares $11.58 million -2.4%N/A5.2 $1.09 9/30/2023149,700 shares $164.67 thousand +156.8%9.2%0.5 $1.10 9/15/202310,880,000 shares $12.08 million +5.7%N/A4.9 $1.11 9/15/202358,300 shares $72.58 thousand +80.5%3.6%0.2 $1.25 8/31/202310,290,000 shares $13.17 million -6.8%N/A3.6 $1.28 8/31/202332,300 shares $40.38 thousand -34.9%2.1%0.1 $1.25 8/15/202311,040,000 shares $13.25 million -8.4%N/A3.3 $1.20 8/15/202349,600 shares $68.94 thousand +2,056.5%3.6%0.3 $1.39 7/31/202312,050,000 shares $21.57 million -11.2%N/A3.5 $1.79 7/31/20232,300 shares $5.59 thousand -70.9%0.2%0 $2.43 7/15/202313,570,000 shares $25.51 million -5.7%N/A3.7 $1.88 7/15/20237,900 shares $25.68 thousand -65.4%0.6%0 $3.25 6/30/202314,390,000 shares $27.92 million +57.4%N/A3.7 $1.94 6/30/202322,800 shares $71.59 thousand -26.9%1.7%0.1 $3.14 6/15/20239,140,000 shares $20.75 million +7.0%N/A2.3 $2.27 6/15/202331,200 shares $93.91 thousand -22.4%2.3%0.1 $3.01 5/31/20238,540,000 shares $17.34 million +189.5%N/A2.6 $2.03 5/31/202340,200 shares $103.31 thousand -23.9%3.1%0.2 $2.57 5/15/20232,950,000 shares $4.48 million -2.6%N/A1.1 $1.52 5/15/202352,800 shares $182.16 thousand +214.3%4.0%0.2 $3.45 4/30/20233,030,000 shares $4.45 million -14.2%N/A1.7 $1.47 4/30/202316,800 shares $57.79 thousand +1,427.3%1.3%0.1 $3.44 4/15/20233,530,000 shares $4.06 million +86.8%N/A2.6 $1.15 4/15/20231,100 shares $3.30 thousand -96.1%0.0%0.1 $3.00 3/31/20231,890,000 shares $1.64 million +10.5%N/A1.7 $0.87 3/31/202328,400 shares $9.09 thousand -15.5%0.2%0.6 $0.32 3/15/20231,710,000 shares $1.55 million +34.7%N/A2.1 $0.91 3/15/202333,600 shares $15.79 thousand +232.7%0.3%0.7 $0.47 2/28/20231,270,000 shares $1.19 million +22.1%N/A1.1 $0.94 2/28/202310,100 shares $4.85 thousand +87.0%0.1%0.2 $0.48 2/15/20231,040,000 shares $1.04 million -3.7%N/A0.8 $1.00 2/15/20235,400 shares $2.65 thousand -64.0%0.0%0.1 $0.49 1/31/20231,080,000 shares $1.11 million -13.6%N/A0.8 $1.03 1/31/202315,000 shares $8.40 thousand +552.2%0.1%0.4 $0.56 1/15/20231,250,000 shares $1.51 million -20.9%N/A1 $1.21 1/15/20232,300 shares $1.12 thousand -85.4%0.0%0.1 $0.49 12/30/20221,580,000 shares $1.57 million +17.9%N/A1.3 $0.99 12/30/202215,800 shares $7.54 thousand +30.6%0.1%0.6 $0.48 12/15/20221,340,000 shares $1.08 million -12.4%N/A0.9 $0.81 12/15/202212,100 shares $5.81 thousand -55.0%0.1%0.4 $0.48 11/30/20221,530,000 shares $2.30 million -0.7%N/A1.3 $1.50 11/30/202226,900 shares $15.55 thousand +23.4%0.2%0.9 $0.58 11/15/20221,540,000 shares $2.93 million -4.9%N/A1.9 $1.90 11/15/202221,800 shares $13.56 thousand +46.3%0.2%0.4 $0.62 10/31/20221,620,000 shares $3.08 million -1.8%N/A1.9 $1.90 10/31/202214,900 shares $9.89 thousand -23.6%0.1%0.2 $0.66 10/15/20221,650,000 shares $3.33 million -8.8%N/A2.1 $2.02 10/15/202219,500 shares $16.38 thousand +2.6%0.2%0.2 $0.84 9/30/20221,810,000 shares $3.10 million +272.0%N/A2.4 $1.71 9/30/202219,000 shares $16.63 thousand +8.0%0.1%0.2 $0.88 9/15/2022486,600 shares $583.92 thousand -11.3%N/A1.1 $1.20 9/15/202217,600 shares $22 thousand -78.4%0.1%0.2 $1.25 8/31/2022548,700 shares $543.27 thousand -57.5%N/A1.7 $0.99 8/31/202281,500 shares $105.95 thousand +1,634.0%0.6%0.6 $1.30 8/15/20221,290,000 shares $1.88 million +92.2%N/A4.7 $1.46 8/15/20224,700 shares $6.25 thousand -35.6%0.0%0 $1.33 7/31/2022671,200 shares $859.14 thousand +13.8%4.3%3 $1.28 7/31/20227,300 shares $11.10 thousand -16.1%0.1%0 $1.52 7/15/2022590,000 shares $631.30 thousand -1.2%3.8%2.9 $1.07 7/15/20228,700 shares $11.48 thousand No Change0.1%0 $1.32 6/30/2022597,000 shares $576.11 thousand -9.4%2.7%2.9 $0.97 6/15/2022658,700 shares $744.33 thousand +0.8%3.0%3.7 $1.13 5/31/2022653,300 shares $790.49 thousand +6.3%2.9%2.7 $1.21 5/15/2022614,600 shares $737.52 thousand -0.6%2.8%1.5 $1.20 4/30/2022618,000 shares $797.22 thousand -15.9%2.9%1.5 $1.29 4/15/2022734,900 shares $1.04 million +15.7%3.4%1.8 $1.42 3/31/2022635,200 shares $1.11 million +12.9%3.0%1.6 $1.75 3/15/2022562,800 shares $1.11 million +22.1%2.9%1.2 $1.97 2/28/2022461,000 shares $691.50 thousand +29.7%2.4%0.5 $1.50 2/15/2022355,500 shares $579.47 thousand -34.5%1.8%0.4 $1.63 1/31/2022543,100 shares $1.12 million +26.0%2.6%0.6 $2.06 1/15/2022430,900 shares $900.58 thousand -38.1%2.1%0.5 $2.09 12/31/2021695,800 shares $1.59 million +68.2%N/A0 $2.29 12/15/2021413,600 shares $835.47 thousand +49.5%2.1%0.5 $2.02 11/30/2021276,600 shares $1.23 million +15.8%1.4%1.4 $4.45 11/15/2021238,800 shares $1.15 million -0.7%1.2%1.4 $4.83 10/29/2021240,400 shares $1.16 million -7.7%1.2%1.4 $4.84 10/15/2021260,400 shares $1.36 million +39.4%1.4%2.3 $5.23 9/30/2021186,800 shares $988.17 thousand -51.6%1.0%1.8 $5.29 9/15/2021385,800 shares $1.85 million +2.0%2.0%2.2 $4.80 8/31/2021378,300 shares $1.94 million -7.8%2.0%1.8 $5.13 8/13/2021410,300 shares $2.32 million -22.3%2.1%1.8 $5.66 7/30/2021527,800 shares $3.03 million -10.6%2.7%2.3 $5.75 7/15/2021590,400 shares $3.50 million +61.7%2.9%2.6 $5.92 6/30/2021365,100 shares $2.37 million -68.3%1.8%1.6 $6.50 6/15/20211,150,000 shares $9.32 million +25.3%5.8%7.4 $8.10 5/28/2021917,800 shares $8.72 million -3.3%4.6%7.2 $9.50 5/14/2021949,300 shares $7.07 million +19.7%N/A8.3 $7.45 4/30/2021793,300 shares $6.73 million +16.7%N/A7.2 $8.48 4/15/2021679,700 shares $6.08 million +10.7%N/A6.1 $8.95 3/31/2021614,300 shares $5.20 million +12.6%N/A5.4 $8.47 3/15/2021545,700 shares $5.21 million +16.3%N/A5 $9.55 2/26/2021469,200 shares $4.49 million +9.8%N/A4.7 $9.57 2/12/2021427,200 shares $3.81 million +14.6%N/A4.3 $8.91 1/29/2021372,700 shares $2.78 million -0.9%N/A4.2 $7.45 1/15/2021376,200 shares $3.07 million +0.6%N/A4.4 $8.15 12/31/2020374,100 shares $2.53 million +8.7%N/A4.6 $6.75 12/15/2020344,200 shares $2.09 million -3.5%N/A4.3 $6.09 11/30/2020356,600 shares $2.42 million +8.7%N/A3.8 $6.80 10/30/2020312,700 shares $1.82 million -4.9%N/A3.5 $5.83 10/15/2020328,900 shares $2.22 million +6.9%N/A3.6 $6.76 9/30/2020307,600 shares $2.08 million +6.2%N/A3.1 $6.77 9/15/2020289,700 shares $2.05 million +12.1%N/A2.9 $7.06 XFOR Short Interest - Frequently Asked Questions What is X4 Pharmaceuticals' current short interest? Short interest is the volume of X4 Pharmaceuticals shares that have been sold short but have not yet been closed out or covered. As of August 15th, investors have sold 2,470,000 shares of XFOR short. 17.28% of X4 Pharmaceuticals' shares are currently sold short. Learn More on X4 Pharmaceuticals' current short interest. What is a good short interest ratio for X4 Pharmaceuticals? 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. XFOR shares currently have a short interest ratio of 1.0. Learn More on X4 Pharmaceuticals's short interest ratio. Which institutional investors are shorting X4 Pharmaceuticals? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of X4 Pharmaceuticals: Group One Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for X4 Pharmaceuticals? 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. 17.28% of X4 Pharmaceuticals' floating shares are currently sold short. Is X4 Pharmaceuticals' short interest increasing or decreasing? X4 Pharmaceuticals saw a increase in short interest in the month of August. As of August 15th, there was short interest totaling 2,470,000 shares, an increase of 142.2% from the previous total of 1,020,000 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. What is X4 Pharmaceuticals' float size? X4 Pharmaceuticals currently has issued a total of 11,410,000 shares. Some of X4 Pharmaceuticals' 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. X4 Pharmaceuticals currently has a public float of 14,290,000 shares. How does X4 Pharmaceuticals' short interest compare to its competitors? 17.28% of X4 Pharmaceuticals' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to X4 Pharmaceuticals: Ventyx Biosciences, Inc. (7.44%), ALT5 Sigma Corporation (1.77%), biote Corp. (2.69%), China SXT Pharmaceuticals, Inc. (0.06%), Nuvectis Pharma, Inc. (7.37%), Seres Therapeutics, Inc. (15.97%), Lifevantage Corporation (23.10%), Kyverna Therapeutics, Inc. (6.43%), MEI Pharma, Inc. (40.00%), Black Diamond Therapeutics, Inc. (12.12%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Lucid Group, Inc. ($8.00 billion), Spotify Technology ($5.48 billion), AppLovin Corporation ($5.11 billion), Reddit Inc. ($5.02 billion), Coinbase Global, Inc. ($3.99 billion), Charter Communications, Inc. ($3.89 billion), Live Nation Entertainment, Inc. ($3.18 billion), Seagate Technology Holdings PLC ($2.59 billion), ResMed Inc. ($2.55 billion), and Rocket Lab Corporation ($2.52 billion). View all of the most shorted stocks. What does it mean to sell short X4 Pharmaceuticals stock? Short selling XFOR is an investing strategy that aims to generate trading profit from X4 Pharmaceuticals as its price is falling. XFOR shares are trading down $0.23 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 X4 Pharmaceuticals? A short squeeze for X4 Pharmaceuticals 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 XFOR, which in turn drives the price of the stock up even further. How often is X4 Pharmaceuticals' 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 XFOR, twice per month. The most recent reporting period available is August, 15 2025. More Short Interest Resources from MarketBeat Related Companies Ventyx Biosciences Short Squeeze ALT5 Sigma Short Squeeze biote Short Squeeze China SXT Pharmaceuticals Short Squeeze Nuvectis Pharma Short Squeeze Seres Therapeutics Short Squeeze Lifevantage Short Squeeze Kyverna Therapeutics Short Squeeze MEI Pharma Short Squeeze Black Diamond Therapeutics Short Squeeze Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:XFOR) was last updated on 9/5/2025 by MarketBeat.com Staff From Our PartnersWhy Trump’s “Smart Dollar” could rewrite the rulesMUST SEE: Donald Trump's Radical Overhaul of the U.S. Dollar Congress just approved President Trump's lates...Stansberry Research | Sponsored“Sell Nvidia before earnings”Eric Fry just went live with one of his most controversial calls yet: “Sell Nvidia.” While Wall Street has bee...InvestorPlace | SponsoredHow “Trump’s New Dollar” Could Impact Your WealthPresident Trump just signed a game-changing law… That could soon upgrade the U.S. dollar in your checking a...Brownstone Research | 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 | SponsoredRetire Comfortably with These New Monthly Income ETFs?Too many retirees lie awake at night, worried their savings won’t last. 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