Ultragenyx Pharmaceutical (RARE) Short Interest Ratio & Short Volume $38.78 -0.20 (-0.50%) As of 03:17 PM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Ultragenyx Pharmaceutical Short Interest DataUltragenyx Pharmaceutical (RARE) has a short interest of 5.46 million shares, representing 6.28% of the float (the number of shares available for trading by the public). This marks a 20.53% increase in short interest from the previous month. The short interest ratio (days to cover) is 6.6, indicating that it would take 6.6 days of the average trading volume of 816,330 shares to cover all short positions.Current Short Interest5,460,000 sharesPrevious Short Interest4,530,000 sharesChange Vs. Previous Month+20.53%Dollar Volume Sold Short$192.96 millionShort Interest Ratio6.6 Days to CoverLast Record DateApril 15, 2025Outstanding Shares93,893,000 sharesShort Percent of Float6.28%Today's Trading Volume373,409 sharesAverage Trading Volume816,330 sharesToday's Volume Vs. Average46% Short Selling Ultragenyx Pharmaceutical? Sign up to receive the latest short interest report for Ultragenyx Pharmaceutical and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartRARE Short Interest Over TimeRARE Days to Cover Over TimeRARE Percentage of Float Shorted Over Time Ultragenyx Pharmaceutical Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 4/15/20255,460,000 shares $192.96 million +20.5%6.3%6.6 $35.34 3/31/20254,530,000 shares $164.03 million -5.8%5.2%5.4 $36.21 3/15/20254,810,000 shares $189.23 million +4.8%5.5%5.7 $39.34 2/28/20254,590,000 shares $197.00 million +7.2%5.3%5.4 $42.92 2/15/20254,280,000 shares $181.86 million +2.9%4.9%5.4 $42.49 1/31/20254,160,000 shares $179.00 million -2.1%N/A5 $43.03 1/15/20254,250,000 shares $174.17 million +5.7%N/A4.8 $40.98 12/31/20244,020,000 shares $169.12 million +8.4%N/A5 $42.07 12/15/20243,710,000 shares $169.84 million +9.8%N/A5 $45.78 11/30/20243,380,000 shares $160.99 million +0.9%N/A4.8 $47.63 Get the Latest News and Ratings for RARE and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Ultragenyx Pharmaceutical and its competitors with MarketBeat's FREE daily newsletter. 11/15/20243,350,000 shares $149.91 million +5.4%N/A4.7 $44.75 10/31/20243,180,000 shares $162.15 million +0.6%N/A4.5 $50.99 10/15/20243,160,000 shares $180.50 million +9.3%N/A4.7 $57.12 9/30/20242,890,000 shares $160.54 million -19.9%N/A4.1 $55.55 9/15/20243,610,000 shares $212.05 million +2.9%N/A4.7 $58.74 8/31/20243,510,000 shares $199.30 million -8.8%N/A4.1 $56.78 8/15/20243,850,000 shares $199.16 million -9.0%N/A4.3 $51.73 7/31/20244,230,000 shares $190.43 million -3.0%N/A4.8 $45.02 7/15/20244,360,000 shares $193.85 million +2.8%N/A5.1 $44.46 6/30/20244,240,000 shares $174.26 million -15.9%N/A4.8 $41.10 6/15/20245,040,000 shares $196.81 million +12.8%N/A6.2 $39.05 5/31/20244,470,000 shares $179.43 million +3.0%N/A6.1 $40.14 5/15/20244,340,000 shares $178.46 million -6.7%N/A5.9 $41.12 4/30/20244,650,000 shares $197.81 million +6.2%N/A6.3 $42.54 4/15/20244,380,000 shares $187.77 million +11.7%N/A6.3 $42.87 3/31/20243,920,000 shares $183.02 million +3.7%N/A5.3 $46.69 3/15/20243,780,000 shares $179.06 million -2.3%N/A5 $47.37 2/29/20243,870,000 shares $200.16 million +8.7%N/A4.9 $51.72 2/15/20243,560,000 shares $164.69 million +4.4%N/A4.6 $46.26 1/31/20243,410,000 shares $150.42 million -17.2%N/A4.3 $44.11 1/15/20244,120,000 shares $188.28 million +1.5%N/A4.4 $45.70 12/31/20234,060,000 shares $194.15 million +21.6%N/A4.1 $47.82 12/15/20233,340,000 shares $153.54 million +3.1%N/A3.4 $45.97 11/30/20233,240,000 shares $125.87 million -7.4%N/A3.4 $38.85 11/15/20233,500,000 shares $136.78 million -15.9%N/A3.8 $39.08 10/31/20234,160,000 shares $147.26 million +24.6%N/A4.6 $35.40 10/15/20233,340,000 shares $112.12 million -15.0%5.0%4 $33.57 9/30/20233,930,000 shares $140.10 million +15.6%5.9%6.3 $35.65 9/15/20233,400,000 shares $128.11 million -1.5%5.1%6 $37.68 8/31/20233,450,000 shares $126.93 million -1.7%5.2%6.2 $36.79Here’s How to Claim Your Stake in Elon’s Private Company, xAI (Ad)I predict this single breakthrough could make Elon the world’s first trillionaire — and mint more new millionaires than any tech advance in history. And for a limited time, you have the chance to claim a stake in this project, even though it’s housed inside Elon’s private company, xAI.All the details are waiting for you now — but you need to act before the May 1st funding window clos 8/15/20233,510,000 shares $134.75 million -1.1%5.3%6.2 $38.39 7/31/20233,550,000 shares $153.08 million -10.4%5.4%5.9 $43.12 7/15/20233,960,000 shares $174.95 million +6.5%6.0%6.4 $44.18 6/30/20233,720,000 shares $171.60 million +22.0%5.7%5.7 $46.13 6/15/20233,050,000 shares $149.02 million -4.1%4.7%4.5 $48.86 5/31/20233,180,000 shares $156.96 million -8.9%4.9%4.8 $49.36 5/15/20233,490,000 shares $171.08 million +17.1%5.3%5.5 $49.02 4/30/20232,980,000 shares $130.14 million +4.2%4.6%4.9 $43.67 4/15/20232,860,000 shares $109.25 million -8.0%4.4%4.8 $38.20 3/31/20233,110,000 shares $124.71 million +4.4%4.8%5.2 $40.10 3/15/20232,980,000 shares $121.38 million -3.3%4.6%5 $40.73 2/28/20233,080,000 shares $137.03 million -6.4%4.7%4.8 $44.49 2/15/20233,290,000 shares $145.45 million -3.2%5.1%4.8 $44.21 1/31/20233,400,000 shares $154.12 million -4.8%5.2%4.6 $45.33 1/15/20233,570,000 shares $155.47 million +6.3%5.5%4.7 $43.55 12/30/20223,360,000 shares $155.67 million -1.2%5.2%4.3 $46.33 12/15/20223,400,000 shares $154.94 million +14.1%5.2%4.2 $45.57 11/30/20222,980,000 shares $108.17 million -1.3%4.6%3.8 $36.30 11/15/20223,020,000 shares $107.09 million +2.0%4.7%4.1 $35.46 10/31/20222,960,000 shares $119.76 million -8.6%4.6%4.1 $40.46 10/15/20223,240,000 shares $120.07 million +5.9%5.0%4.5 $37.06 9/30/20223,060,000 shares $126.71 million -1.9%4.7%4.1 $41.41 9/15/20223,120,000 shares $147.51 million +6.5%4.8%4.5 $47.28 8/31/20222,930,000 shares $139.73 million -3.9%4.5%4.2 $47.69 8/15/20223,050,000 shares $156.16 million +7.4%4.7%4.4 $51.20 7/31/20222,840,000 shares $151.32 million -5.0%4.4%4.1 $53.28 7/15/20222,990,000 shares $193.60 million +3.5%4.6%4.6 $64.75 6/30/20222,890,000 shares $172.42 million +7.0%4.5%5.1 $59.66 6/15/20222,700,000 shares $136.92 million +0.4%4.2%4.9 $50.71 5/31/20222,690,000 shares $126.16 million -10.9%4.2%5.2 $46.90 5/15/20223,020,000 shares $155.44 million -1.3%4.7%6.2 $51.47 4/30/20223,060,000 shares $216.31 million +5.9%4.8%6.9 $70.69 4/15/20222,890,000 shares $246.81 million +2.5%4.5%6.7 $85.40 3/31/20222,820,000 shares $204.79 million -3.8%4.4%6.6 $72.62 3/15/20222,930,000 shares $186.61 million -3.3%4.6%7.1 $63.69 2/28/20223,030,000 shares $203.98 million -8.5%4.7%7.3 $67.32 2/15/20223,310,000 shares $243.45 million -4.9%5.2%7.6 $73.55 1/31/20223,480,000 shares $243.36 million -0.3%5.5%8.5 $69.93 1/15/20223,490,000 shares $251.45 million +0.6%5.5%8.5 $72.05 12/31/20213,470,000 shares $291.79 million -11.5%5.5%8.2 $84.09 12/15/20213,920,000 shares $325.56 million -1.3%6.2%9.2 $83.05 11/30/20213,970,000 shares $298.66 million -2.7%6.3%9.5 $75.23 11/15/20214,080,000 shares $328.60 million +10.3%6.5%10.6 $80.54 10/29/20213,700,000 shares $310.50 million -3.9%5.9%9.1 $83.92 10/15/20213,850,000 shares $308 million -4.0%6.1%9.3 $80.00 9/30/20214,010,000 shares $361.66 million +3.9%6.4%9.7 $90.19 9/15/20213,860,000 shares $374.42 million -4.0%6.1%7 $97.00 8/31/20214,020,000 shares $387.09 million -0.7%6.4%6.7 $96.29 8/13/20214,050,000 shares $375.60 million -0.5%6.4%6.6 $92.74 7/30/20214,070,000 shares $324.91 million +3.0%6.5%6.6 $79.83Here’s How to Claim Your Stake in Elon’s Private Company, xAI (Ad)I predict this single breakthrough could make Elon the world’s first trillionaire — and mint more new millionaires than any tech advance in history. And for a limited time, you have the chance to claim a stake in this project, even though it’s housed inside Elon’s private company, xAI.All the details are waiting for you now — but you need to act before the May 1st funding window clos 7/15/20213,950,000 shares $334.76 million +4.5%6.3%6.5 $84.75 6/30/20213,780,000 shares $360.42 million -23.6%6.0%6.3 $95.35 6/15/20214,950,000 shares $495.20 million -2.6%7.8%10.4 $100.04 5/28/20215,080,000 shares $516.69 million -1.0%8.0%11.6 $101.71 5/14/20215,130,000 shares $547.42 million -6.0%N/A12.1 $106.71 4/30/20215,460,000 shares $619.76 million +1.1%N/A12.4 $113.51 4/15/20215,400,000 shares $583.04 million -2.0%N/A13.1 $107.97 3/31/20215,510,000 shares $617.45 million -0.5%N/A12.1 $112.06 3/15/20215,540,000 shares $703.30 million -5.5%N/A11.2 $126.95 2/26/20215,860,000 shares $798.43 million +10.4%N/A11.6 $136.25 2/12/20215,310,000 shares $864.36 million -0.4%N/A10.9 $162.78 1/29/20215,330,000 shares $749.40 million -3.3%N/A11.3 $140.60 1/15/20215,510,000 shares $770.68 million -5.3%N/A10.1 $139.87 12/31/20205,820,000 shares $840.23 million -7.6%N/A11.3 $144.37 12/15/20206,300,000 shares $965.29 million -4.1%N/A14.2 $153.22 11/30/20206,570,000 shares $804.30 million -4.0%N/A15.4 $122.42 11/15/20206,840,000 shares $801.78 million -3.3%N/A16.4 $117.22 10/30/20207,070,000 shares $671.65 million -4.3%N/A17.4 $95.00 10/15/20207,390,000 shares $684.98 million +5.4%13.2%22.3 $92.69 9/30/20207,010,000 shares $576.15 million +1.7%12.5%20.3 $82.19 9/15/20206,890,000 shares $559.67 million +1.6%12.3%16.9 $81.23 8/31/20206,780,000 shares $576.71 million -0.9%12.1%15.7 $85.06 8/14/20206,840,000 shares $582.15 million -14.7%12.2%15.2 $85.11 7/31/20208,020,000 shares $626.84 million No Change14.3%16.1 $78.16 7/15/20208,020,000 shares $684.99 million +4.6%14.5%15.2 $85.41 6/30/20207,670,000 shares $564.97 million +3.4%13.7%13.7 $73.66 6/15/20207,420,000 shares $513.54 million -2.2%13.3%13.5 $69.21 5/29/20207,590,000 shares $520.60 million +0.8%13.6%13 $68.59 5/15/20207,530,000 shares $536.81 million +1.4%13.5%12.7 $71.29 RARE Short Interest - Frequently Asked Questions What is Ultragenyx Pharmaceutical's current short interest? Short interest is the volume of Ultragenyx Pharmaceutical shares that have been sold short but have not yet been covered or closed out. As of April 15th, traders have sold 5,460,000 shares of RARE short. 6.28% of Ultragenyx Pharmaceutical's shares are currently sold short. Learn More on Ultragenyx Pharmaceutical's current short interest. What is a good short interest ratio for Ultragenyx Pharmaceutical? 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. RARE shares currently have a short interest ratio of 7.0. Learn More on Ultragenyx Pharmaceutical's short interest ratio. Which institutional investors are shorting Ultragenyx Pharmaceutical? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Ultragenyx Pharmaceutical: Torno Capital LLC, Group One Trading LLC, Caption Management LLC, Citadel Advisors LLC, Jane Street Group LLC, Diadema Partners LP, Concourse Financial Group Securities Inc., Walleye Capital LLC, and JPMorgan Chase & Co.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Ultragenyx Pharmaceutical? 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. 6.28% of Ultragenyx Pharmaceutical's floating shares are currently sold short. Is Ultragenyx Pharmaceutical's short interest increasing or decreasing? Ultragenyx Pharmaceutical saw a increase in short interest in April. As of April 15th, there was short interest totaling 5,460,000 shares, an increase of 20.5% from the previous total of 4,530,000 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 Ultragenyx Pharmaceutical's short interest compare to its competitors? 6.28% of Ultragenyx Pharmaceutical's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Ultragenyx Pharmaceutical: Intra-Cellular Therapies, Inc. (2.58%), Genmab A/S (0.33%), Dr. Reddy's Laboratories Limited (1.91%), Moderna, Inc. (16.48%), Ascendis Pharma A/S (11.37%), Viatris Inc. (3.96%), Qiagen (2.11%), Roivant Sciences Ltd. (11.68%), Revolution Medicines, Inc. (10.62%), Lantheus Holdings, Inc. (10.23%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Invesco QQQ ($21.71 billion), iShares 20+ Year Treasury Bond ETF ($9.48 billion), Strategy Incorporated ($8.92 billion), Charter Communications, Inc. ($3.86 billion), Apollo Global Management, Inc. ($3.86 billion), Capital One Financial Co. ($3.72 billion), Super Micro Computer, Inc. ($3.47 billion), AppLovin Co. ($2.64 billion), VanEck Semiconductor ETF ($2.46 billion), and The Kroger Co. ($2.33 billion). View all of the most shorted stocks. What does it mean to sell short Ultragenyx Pharmaceutical stock? Short selling RARE is an investing strategy that aims to generate trading profit from Ultragenyx Pharmaceutical as its price is falling. RARE shares are trading down $0.20 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 Ultragenyx Pharmaceutical? A short squeeze for Ultragenyx Pharmaceutical 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 RARE, which in turn drives the price of the stock up even further. How often is Ultragenyx Pharmaceutical'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 RARE, twice per month. The most recent reporting period available is April, 15 2025. More Short Interest Resources from MarketBeat Related Companies ITCI Short Interest Data GMAB Short Interest Data RDY Short Interest Data MRNA Short Interest Data ASND Short Interest Data VTRS Short Interest Data QGEN Short Interest Data ROIV Short Interest Data RVMD Short Interest Data LNTH 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:RARE) was last updated on 5/1/2025 by MarketBeat.com Staff From Our PartnersHow to invest in Elon Musk’s Optimus before its launchElon Musk is set to completely take over the AI industry with Optimus… A breakthrough AI-powered robot that El...InvestorPlace | SponsoredBlackrock’s Sending THIS Crypto Higher on PurposeWhile everyone's distracted by Bitcoin's moves, a stealth revolution is underway. 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