Phathom Pharmaceuticals (PHAT) Short Interest Ratio & Short Volume $11.76 +0.37 (+3.24%) As of 01:58 PM Eastern This is a fair market value price provided by Massive. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Phathom Pharmaceuticals Short Interest OverviewAs of April 30, 2026, Phathom Pharmaceuticals (PHAT) had a short interest of 9.74 million shares sold short, representing 13.46% of the public float. This marks a 2.46% increase in short interest since the prior report. The short interest ratio (days to cover) is 5.9, meaning it would take 5.9 days of the average trading volume of 1.21 million shares to cover all short positions.Current Short Interest9,736,465 sharesPrevious Short Interest9,502,963 sharesChange Vs. Previous Month2.46%Dollar Volume Sold Short$109.05 millionShort Interest Ratio5.9 Days to CoverLast Record DateApril 30, 2026Outstanding Shares79,760,000 sharesShort Percent of Float13.46%Today's Trading Volume387,687 sharesAverage Trading Volume1,205,336 sharesToday's Volume Vs. Average32% Short Selling Phathom Pharmaceuticals? Sign up to receive the latest short interest report for Phathom Pharmaceuticals and its competitors with MarketBeat's FREE newsletter. Email Address Get Report View SMS TermsSMS is currently available in Australia, Belgium, Canada, France, Germany, Ireland, Italy, New Zealand, the Netherlands, Singapore, South Africa, Spain, Switzerland, the United Kingdom, and the United States. By 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. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartPHAT Short Interest Over TimePHAT Days to Cover Over TimePHAT Percentage of Float Shorted Over Time Phathom Pharmaceuticals Tesla Short Interest History & Recent Changes ExportReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 4/30/20269,736,465 shares $109.05 million +2.5%13.5%5.88 $11.20 4/15/20269,502,963 shares $121.54 million -10.7%13.2%9.92 $12.79 3/31/202610,637,936 shares $118.19 million -8.8%17.5%9.23 $11.11 3/13/202611,657,728 shares $120.89 million +4.4%19.5%10.93 $10.37 2/27/202611,169,289 shares $140.29 million -4.7%18.7%9.81 $12.56 2/13/202611,718,291 shares $140.85 million +2.8%21.6%14.85 $12.02 1/30/202611,396,304 shares $155.79 million +8.3%21.0%10.88 $13.67 1/15/202610,523,193 shares $157.64 million -2.4%19.4%6.48 $14.98 12/31/202510,780,383 shares $178.85 million -15.0%19.9%10.51 $16.59 12/15/202512,677,843 shares $186.24 million -0.5%23.5%15.98 $14.69 Get the Latest News and Ratings for PHAT and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Phathom Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 11/28/202512,739,028 shares $198.67 million -2.6%23.6%16.13 $15.60 11/14/202513,078,808 shares $190.43 million -3.6%24.2%14.33 $14.56 10/31/202513,566,849 shares $183.83 million -4.0%25.1%13.59 $13.55 10/15/202514,130,000 shares $190.05 million +7.1%26.2%12.1 $13.45 9/30/202513,200,000 shares $155.36 million -5.7%N/A11.5 $11.77 9/15/202514,000,000 shares $160.72 million +6.3%N/A12.7 $11.48 8/31/202513,170,000 shares $160.41 million +8.9%24.1%8.9 $12.18 8/15/202512,090,000 shares $123.80 million +19.8%N/A5.4 $10.24 7/31/202510,090,000 shares $86.17 million +4.1%18.5%4 $8.54 7/15/20259,690,000 shares $82.75 million +13.7%N/A3.6 $8.54 6/30/20258,520,000 shares $81.71 million -22.8%15.8%3.2 $9.59 6/15/202511,040,000 shares $117.47 million +0.6%20.5%4.1 $10.64 5/31/202510,980,000 shares $46.56 million -1.8%21.2%4.3 $4.24 5/15/202511,180,000 shares $38.91 million +2.4%21.5%6.8 $3.48 4/30/202510,920,000 shares $46.85 million -4.0%N/A7 $4.29 4/15/202511,380,000 shares $54.28 million -11.9%21.9%9.5 $4.77 3/31/202512,910,000 shares $80.95 million -10.1%24.9%10.9 $6.27 3/15/202514,360,000 shares $63.33 million +3.2%27.7%12.7 $4.41 2/28/202513,920,000 shares $76.84 million -6.3%26.8%13.3 $5.52 2/15/202514,860,000 shares $85.74 million +1.6%28.6%14.7 $5.77 1/31/202514,630,000 shares $87.63 million +3.0%N/A11.3 $5.99 1/15/202514,200,000 shares $101.25 million -5.0%N/A11.1 $7.13 12/31/202414,950,000 shares $121.39 million +5.8%N/A11.8 $8.12 12/15/202414,130,000 shares $111.49 million +0.6%N/A11 $7.89 11/30/202414,050,000 shares $124.62 million -4.2%N/A10.7 $8.87 11/15/202414,660,000 shares $128.71 million -16.0%N/A10.9 $8.78 10/31/202417,450,000 shares $299.27 million -0.6%N/A16.3 $17.15 10/15/202417,560,000 shares $274.99 million +2.0%N/A18.5 $15.66 9/30/202417,220,000 shares $311.34 million +11.0%N/A18 $18.08 9/15/202415,520,000 shares $284.02 million +1.2%N/A17.4 $18.30The REAL Reason Trump is Invading Iran (Ad)For a moment… Forget about Trump’s ties to Israel. 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Because my research has led me to believe we’re risking World War 3 with Iran for a completely different reason.Click here to find out what it is. 8/31/202415,340,000 shares $253.42 million +7.7%N/A19.8 $16.52 8/15/202414,250,000 shares $186.75 million +3.8%N/A20.4 $13.11 7/31/202413,730,000 shares $162.29 million +5.0%49.5%21 $11.82 7/15/202413,080,000 shares $165.72 million -2.4%47.1%20.5 $12.67 6/30/202413,400,000 shares $138.02 million +2.3%47.9%22.9 $10.30 6/15/202413,100,000 shares $148.69 million +6.2%46.8%20.7 $11.35 5/31/202412,330,000 shares $116.15 million +1.2%44.1%18.8 $9.42 5/15/202412,180,000 shares $126.79 million +3.2%43.2%16.3 $10.41 4/30/202411,800,000 shares $106.55 million -1.9%41.9%13.4 $9.03 4/15/202412,030,000 shares $120.54 million +13.0%43.5%13.7 $10.02 3/31/202410,650,000 shares $113.10 million +2.0%40.0%12 $10.62 3/15/202410,440,000 shares $88.64 million +20.4%40.1%13 $8.49 2/29/20248,670,000 shares $92.77 million -6.3%34.0%11.4 $10.70 2/15/20249,250,000 shares $63.83 million +7.2%36.3%13.2 $6.90 1/31/20248,630,000 shares $57.82 million +5.4%32.4%14.9 $6.70 1/15/20248,190,000 shares $61.92 million +15.7%30.8%14.3 $7.56 12/31/20237,080,000 shares $64.64 million +12.9%26.6%13.9 $9.13 12/15/20236,270,000 shares $54.67 million +14.0%23.6%12.9 $8.72 11/30/20235,500,000 shares $38.45 million +12.9%20.9%10.5 $6.99 11/15/20234,870,000 shares $35.75 million +18.2%18.5%10.4 $7.34 10/31/20234,120,000 shares $38.32 million +4.3%16.1%9.6 $9.30 10/15/20233,950,000 shares $39.86 million +0.8%15.4%10.9 $10.09 9/30/20233,920,000 shares $40.65 million +42.0%15.3%11.2 $10.37 9/15/20232,760,000 shares $36.16 million -0.4%10.8%8 $13.10 8/31/20232,770,000 shares $39.86 million +7.0%11.0%9.3 $14.39 8/15/20232,590,000 shares $39.98 million -18.8%10.3%7.4 $15.44 7/31/20233,190,000 shares $48.52 million -25.8%12.2%9.4 $15.21 7/15/20234,300,000 shares $60.46 million +1.7%15.9%12.9 $14.06 6/30/20234,230,000 shares $60.57 million -3.0%14.8%11.4 $14.32 6/15/20234,360,000 shares $55.02 million +4.8%15.2%10.6 $12.62 5/31/20234,160,000 shares $48.92 million -8.0%20.2%10 $11.76 5/15/20234,520,000 shares $56.91 million -7.2%24.7%10.9 $12.59 4/30/20234,870,000 shares $52.11 million +0.4%33.1%11.7 $10.70 4/15/20234,850,000 shares $48.40 million +33.6%27.5%11.5 $9.98 3/31/20233,630,000 shares $25.92 million +18.6%20.8%8.4 $7.14 3/15/20233,060,000 shares $21.42 million +2.7%17.5%7.7 $7.00 2/28/20232,980,000 shares $25.51 million +10.8%15.8%8.4 $8.56 2/15/20232,690,000 shares $25.04 million +18.5%14.3%7.8 $9.31 1/31/20232,270,000 shares $27.08 million +8.6%12.1%8.9 $11.93 1/15/20232,090,000 shares $17.28 million +10.6%11.0%9.1 $8.27 12/30/20221,890,000 shares $21.21 million +18.9%10.0%9.2 $11.22 12/15/20221,590,000 shares $16.15 million -0.6%8.4%11.7 $10.16 11/30/20221,600,000 shares $15.97 million -5.3%8.4%7.7 $9.98 11/15/20221,690,000 shares $17.46 million -8.2%8.9%8 $10.33 10/31/20221,840,000 shares $19.50 million -8.5%11.1%8.1 $10.60 10/15/20222,010,000 shares $19.58 million -54.5%12.1%6.9 $9.74 9/30/20224,420,000 shares $48.97 million -22.5%26.7%15.6 $11.08 9/15/20225,700,000 shares $56.83 million -1.0%29.7%19.3 $9.97 8/31/20225,760,000 shares $49.19 million +4.9%30.1%23 $8.54 8/15/20225,490,000 shares $63.41 million +73.2%28.7%20.6 $11.55SpaceX eyes a 1.75 trillion valuation - here's what to know (Ad)Elon Musk's team has quietly filed confidential paperwork with the SEC for what Bloomberg estimates could be a $1.75 trillion IPO - larger than Saudi Aramco and any tech offering in history. 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Short interest is the volume of Phathom Pharmaceuticals shares that have been sold short but have not yet been closed out or covered. As of April 30th, traders have sold 9,736,465 shares of PHAT short. 13.46% of Phathom Pharmaceuticals' shares are currently sold short. Learn More on Phathom Pharmaceuticals' current short interest. What is a good short interest ratio for Phathom 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. PHAT shares currently have a short interest ratio of 5.9. Learn More on Phathom Pharmaceuticals's short interest ratio. What is a good short interest percentage for Phathom 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. 13.46% of Phathom Pharmaceuticals' floating shares are currently sold short. Is Phathom Pharmaceuticals' short interest increasing or decreasing? Phathom Pharmaceuticals saw a increase in short interest in the month of April. As of April 30th, there was short interest totaling 9,736,465 shares, an increase of 2.5% from the previous total of 9,502,963 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 Phathom Pharmaceuticals' short interest compare to its competitors? 13.46% of Phathom Pharmaceuticals' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Phathom Pharmaceuticals: ACADIA Pharmaceuticals Inc. (8.83%), Catalyst Pharmaceuticals, Inc. (7.15%), Edgewise Therapeutics, Inc. (12.26%), Anbio Biotechnology (0.03%), Viking Therapeutics, Inc. (20.60%), Telix Pharmaceuticals Limited (0.08%), Twist Bioscience Corporation (23.06%), Organon & Co. (7.55%), Beam Therapeutics Inc. (21.15%), Tango Therapeutics, Inc. (28.36%), 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 ($86.09 billion), Invesco QQQ ($39.89 billion), iShares Russell 2000 ETF ($26.13 billion), Western Digital Corporation ($12.66 billion), Salesforce Inc. ($12.29 billion), Sandisk Corporation ($11.87 billion), SPDR S&P Biotech ETF ($9.82 billion), Lumentum Holdings Inc. ($8.51 billion), iShares 20+ Year Treasury Bond ETF ($7.76 billion), and Bloom Energy Corporation ($7.40 billion). View all of the most shorted stocks. What does it mean to sell short Phathom Pharmaceuticals stock? Short selling PHAT is an investing strategy that aims to generate trading profit from Phathom Pharmaceuticals as its price is falling. PHAT shares are trading up $0.40 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 Phathom Pharmaceuticals? A short squeeze for Phathom 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 PHAT, which in turn drives the price of the stock up even further. How often is Phathom 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 PHAT, twice per month. The most recent reporting period available is April, 30 2026. What do PHAT's short interest metrics mean? Understanding short interest metrics can help you assess how traders are positioning around a stock like PHAT:Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity. More Short Interest Resources from MarketBeat Related Companies ACAD Short Squeeze CPRX Short Squeeze EWTX Short Squeeze NNNN Short Squeeze VKTX Short Squeeze TLX Short Squeeze TWST Short Squeeze OGN Short Squeeze BEAM Short Squeeze TNGX 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:PHAT) was last updated on 5/19/2026 by MarketBeat.com Staff. 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