PTC Therapeutics (PTCT) Short Interest Ratio & Short Volume $50.43 -0.42 (-0.83%) Closing price 06/18/2025 04:00 PM EasternExtended Trading$50.44 +0.01 (+0.02%) As of 06/18/2025 07:11 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock PTC Therapeutics Short Interest DataPTC Therapeutics (PTCT) has a short interest of 4.75 million shares, representing 6.52% of the float (the number of shares available for trading by the public). This marks a -8.12% decrease in short interest from the previous month. The short interest ratio (days to cover) is 3.9, indicating that it would take 3.9 days of the average trading volume of 870,454 shares to cover all short positions.Current Short Interest4,750,000 sharesPrevious Short Interest5,170,000 sharesChange Vs. Previous Month-8.12%Dollar Volume Sold Short$231.90 millionShort Interest Ratio3.9 Days to CoverLast Record DateMay 31, 2025Outstanding Shares79,260,000 sharesShort Percent of Float6.52%Today's Trading Volume657,545 sharesAverage Trading Volume870,454 sharesToday's Volume Vs. Average76% Short Selling PTC Therapeutics? Sign up to receive the latest short interest report for PTC Therapeutics and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartPTCT Short Interest Over TimePTCT Days to Cover Over TimePTCT Percentage of Float Shorted Over Time PTC Therapeutics Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/31/20254,750,000 shares $231.90 million -8.1%6.5%3.9 $48.82 5/15/20255,170,000 shares $234.25 million +3.2%7.1%4.3 $45.31 4/30/20255,010,000 shares $249.70 million -8.6%N/A4.4 $49.84 4/15/20255,480,000 shares $257.23 million +1.1%7.5%5.9 $46.94 3/31/20255,420,000 shares $276.20 million +26.1%7.4%6.2 $50.96 3/15/20254,300,000 shares $234.35 million +13.5%5.9%5.9 $54.50 2/28/20253,790,000 shares $209.44 million +2.4%5.2%5.3 $55.26 2/15/20253,700,000 shares $191.73 million -11.1%5.1%5.1 $51.82 1/31/20254,160,000 shares $190.86 million -1.9%N/A5.5 $45.88 1/15/20254,240,000 shares $179.22 million +1.0%N/A5.8 $42.27 Get the Latest News and Ratings for PTCT and Related StocksEnter your email address below to receive the latest news and analysts' ratings for PTC Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 12/31/20244,200,000 shares $189.59 million -8.5%N/A5.4 $45.14 12/15/20244,590,000 shares $212.84 million -0.2%N/A5.6 $46.37 11/30/20244,600,000 shares $201.85 million -1.5%N/A5.6 $43.88 11/15/20244,670,000 shares $183.20 million -4.5%N/A6.3 $39.23 10/31/20244,890,000 shares $195.21 million +4.9%N/A7.2 $39.92 10/15/20244,660,000 shares $175.03 million +9.1%N/A7 $37.56 9/30/20244,270,000 shares $158.42 million -18.2%N/A6.8 $37.10 9/15/20245,220,000 shares $177.43 million -7.3%N/A8.5 $33.99 8/31/20245,630,000 shares $198.85 million -5.4%N/A7.9 $35.32 8/15/20245,950,000 shares $196.59 million +3.7%N/A7.9 $33.04 7/31/20245,740,000 shares $194.30 million -3.7%N/A6.8 $33.85 7/15/20245,960,000 shares $197.45 million +6.4%N/A6.5 $33.13 6/30/20245,600,000 shares $171.25 million -23.8%N/A5.8 $30.58 6/15/20247,350,000 shares $263.20 million -1.9%N/A7.9 $35.81 5/31/20247,490,000 shares $272.34 million -16.0%N/A8.5 $36.36 5/15/20248,920,000 shares $300.25 million -10.2%N/A9.8 $33.66 4/30/20249,930,000 shares $319.25 million -2.7%N/A11.1 $32.15 4/15/202410,200,000 shares $261.94 million -0.6%N/A11.4 $25.68 3/31/202410,260,000 shares $298.46 million -5.8%N/A10.8 $29.09 3/15/202410,890,000 shares $321.80 million -4.5%N/A10.9 $29.55 2/29/202411,400,000 shares $321.37 million +9.8%N/A10.5 $28.19 2/15/202410,380,000 shares $266.66 million -6.0%N/A9.7 $25.69 1/31/202411,040,000 shares $288.03 million +10.7%N/A10.2 $26.09 1/15/20249,970,000 shares $272.48 million +1.9%N/A7.6 $27.33 12/31/20239,780,000 shares $269.54 million +6.1%N/A7.3 $27.56 12/15/20239,220,000 shares $261.76 million +3.7%N/A6.7 $28.39 11/30/20238,890,000 shares $204.65 million +10.0%N/A5.9 $23.02 11/15/20238,080,000 shares $167.82 million +9.5%N/A5.7 $20.77 10/31/20237,380,000 shares $138.38 million +5.1%N/A5.5 $18.75 10/15/20237,020,000 shares $143.14 million -12.4%N/A6 $20.39An AI run of epic proportions is only getting started (Ad)I just put together an urgent new presentation that you need to see right away. 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Click to find out what Nvidia’s CEO might reveal… and how Sykes is preparing to ride the wave. 9/30/20238,010,000 shares $179.50 million +8.5%N/A7.9 $22.41 9/15/20237,380,000 shares $193.80 million -0.3%N/A8.5 $26.26 8/31/20237,400,000 shares $292.30 million +2.6%N/A11.9 $39.50 8/15/20237,210,000 shares $297.48 million +2.3%N/A9.2 $41.26 7/31/20237,050,000 shares $284.40 million -5.5%N/A8.6 $40.34 7/15/20237,460,000 shares $292.28 million -3.2%N/A8.6 $39.18 6/30/20237,710,000 shares $313.57 million +2.7%N/A8.9 $40.67 6/15/20237,510,000 shares $326.61 million +18.5%N/A8.5 $43.49 5/31/20236,340,000 shares $266.09 million +16.8%N/A7.3 $41.97 5/15/20235,430,000 shares $300.28 million +4.0%N/A7 $55.30 4/30/20235,220,000 shares $287.83 million -0.4%N/A7.1 $55.14 4/15/20235,240,000 shares $258.17 million -2.4%N/A7.5 $49.27 3/31/20235,370,000 shares $260.12 million -1.5%N/A7.3 $48.44 3/15/20235,450,000 shares $254.73 million +9.0%N/A7.5 $46.74 2/28/20235,000,000 shares $218.35 million +0.4%N/A7.4 $43.67 2/15/20234,980,000 shares $229.78 million -14.1%N/A7.8 $46.14 1/31/20235,800,000 shares $266.16 million +22.6%N/A9.1 $45.89 1/15/20234,730,000 shares $226.00 million -8.7%N/A6.9 $47.78 12/30/20225,180,000 shares $197.72 million +11.4%N/A7.9 $38.17 12/15/20224,650,000 shares $179.03 million +3.3%N/A7.7 $38.50 11/30/20224,500,000 shares $186.71 million -5.1%N/A7.1 $41.49 11/15/20224,740,000 shares $180.36 million -1.5%N/A7.3 $38.05 10/31/20224,810,000 shares $181.91 million +1.9%6.9%7.5 $37.82 10/15/20224,720,000 shares $243.74 million -6.2%6.8%7.6 $51.64 9/30/20225,030,000 shares $252.51 million -7.7%7.2%8.8 $50.20 9/15/20225,450,000 shares $292.39 million +8.1%7.8%8.7 $53.65 8/31/20225,040,000 shares $251.70 million -1.8%7.3%6.7 $49.94 8/15/20225,130,000 shares $271.48 million -1.0%7.4%6.6 $52.92 7/31/20225,180,000 shares $225.59 million -8.2%9.3%6.5 $43.55 7/15/20225,640,000 shares $247.14 million +11.9%10.2%7.3 $43.82 6/30/20225,040,000 shares $201.90 million -10.3%9.1%6.5 $40.06 6/15/20225,620,000 shares $147.19 million +3.3%10.1%7.3 $26.19 5/31/20225,440,000 shares $159.77 million +1.9%7.9%9 $29.37 5/15/20225,340,000 shares $168.96 million -11.7%7.7%9.2 $31.64 4/30/20226,050,000 shares $213.75 million +7.8%8.8%10.6 $35.33 4/15/20225,610,000 shares $249.65 million +4.5%8.1%9.9 $44.50 3/31/20225,370,000 shares $200.35 million -0.2%7.8%8 $37.31 3/15/20225,380,000 shares $184.10 million No Change7.8%7.7 $34.22 2/28/20225,380,000 shares $188.95 million +3.1%7.8%7.7 $35.12 2/15/20225,220,000 shares $215.12 million +5.7%7.6%6.9 $41.21 1/31/20224,940,000 shares $198.69 million -21.8%7.2%7 $40.22 1/15/20226,320,000 shares $276.50 million -7.9%9.2%9.3 $43.75 12/31/20216,860,000 shares $273.23 million -0.7%10.0%11.4 $39.83 12/15/20216,910,000 shares $262.65 million +16.7%10.1%13.6 $38.01 11/30/20215,920,000 shares $219.99 million -0.7%8.6%11.6 $37.16 11/15/20215,960,000 shares $231.49 million +10.8%8.7%12.7 $38.84 10/29/20215,380,000 shares $204.06 million +6.3%7.9%12 $37.93 10/15/20215,060,000 shares $192.74 million +7.7%7.4%11.3 $38.09 9/30/20214,700,000 shares $174.89 million +5.4%6.9%11.2 $37.21 9/15/20214,460,000 shares $180.90 million -0.9%6.5%10.7 $40.56An AI run of epic proportions is only getting started (Ad)I just put together an urgent new presentation that you need to see right away. 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Click to find out what Nvidia’s CEO might reveal… and how Sykes is preparing to ride the wave. 8/31/20214,500,000 shares $196.43 million -14.0%6.6%11.3 $43.65 8/13/20215,230,000 shares $209.25 million -1.9%7.7%12.9 $40.01 7/30/20215,330,000 shares $204.30 million +5.3%7.8%12.9 $38.33 7/15/20215,060,000 shares $217.48 million +4.8%7.4%10.2 $42.98 6/30/20214,830,000 shares $204.16 million +0.4%7.1%9.1 $42.27 6/15/20214,810,000 shares $210.73 million +1.1%7.1%8.8 $43.81 5/28/20214,760,000 shares $186.93 million -6.3%7.0%8.4 $39.27 5/14/20215,080,000 shares $195.02 million -2.7%N/A8.4 $38.39 4/30/20215,220,000 shares $221.85 million -0.8%N/A8.6 $42.50 4/15/20215,260,000 shares $251.95 million +0.8%N/A9.4 $47.90 3/31/20215,220,000 shares $244.30 million +2.2%N/A9.6 $46.80 3/15/20215,110,000 shares $298.68 million +7.1%N/A9.3 $58.45 2/26/20214,770,000 shares $263.26 million +19.0%N/A9 $55.19 2/12/20214,010,000 shares $253.73 million -2.0%N/A7.9 $63.28 1/29/20214,090,000 shares $230.55 million -2.6%N/A8.5 $56.37 1/15/20214,200,000 shares $288.62 million -11.0%N/A8.7 $68.72 12/31/20204,720,000 shares $288.30 million -3.9%N/A10.2 $61.08 12/15/20204,910,000 shares $324.11 million +5.4%N/A10.7 $66.01 11/30/20204,660,000 shares $298.19 million -0.6%N/A10 $63.99 11/15/20204,690,000 shares $281.87 million +4.0%N/A10.1 $60.10 10/30/20204,510,000 shares $243.04 million -9.6%N/A9.4 $53.89 10/15/20204,990,000 shares $261.23 million -3.5%N/A8.1 $52.35 9/30/20205,170,000 shares $241.70 million +4.2%N/A7.5 $46.75 9/15/20204,960,000 shares $236.05 million -13.0%N/A6.7 $47.59 8/31/20205,700,000 shares $281.69 million -9.4%N/A7.4 $49.42 8/14/20206,290,000 shares $308.34 million +22.4%N/A7.9 $49.02 7/31/20205,140,000 shares $238.14 million -6.0%N/A6.5 $46.33 7/15/20205,470,000 shares $297.90 million +4.2%N/A7.7 $54.46 6/30/20205,250,000 shares $265.86 million +7.4%N/A7.6 $50.64 PTCT Short Interest - Frequently Asked Questions What is PTC Therapeutics' current short interest? Short interest is the volume of PTC Therapeutics shares that have been sold short but have not yet been covered or closed out. As of May 31st, investors have sold 4,750,000 shares of PTCT short. 6.52% of PTC Therapeutics' shares are currently sold short. Learn More on PTC Therapeutics' current short interest. What is a good short interest ratio for PTC Therapeutics? 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. PTCT shares currently have a short interest ratio of 4.0. Learn More on PTC Therapeutics's short interest ratio. Which institutional investors are shorting PTC Therapeutics? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of PTC Therapeutics: Jane Street Group LLC, Caption Management LLC, and Citigroup Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for PTC Therapeutics? 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. 6.52% of PTC Therapeutics' floating shares are currently sold short. Is PTC Therapeutics' short interest increasing or decreasing? PTC Therapeutics saw a drop in short interest in the month of May. As of May 31st, there was short interest totaling 4,750,000 shares, a drop of 8.1% from the previous total of 5,170,000 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 PTC Therapeutics' short interest compare to its competitors? 6.52% of PTC Therapeutics' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to PTC Therapeutics: Summit Therapeutics Inc. (28.33%), Genmab A/S (0.40%), Intra-Cellular Therapies, Inc. (2.58%), Dr. Reddy's Laboratories Limited (1.74%), Ascendis Pharma A/S (9.28%), Viatris Inc. (4.33%), Qiagen (2.96%), Moderna, Inc. (19.23%), Blueprint Medicines Co. (9.93%), BridgeBio Pharma, Inc. (15.35%), 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), MicroStrategy 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 PTC Therapeutics stock? Short selling PTCT is an investing strategy that aims to generate trading profit from PTC Therapeutics as its price is falling. PTCT shares are trading down $0.42 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 PTC Therapeutics? A short squeeze for PTC Therapeutics 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 PTCT, which in turn drives the price of the stock up even further. How often is PTC Therapeutics' 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 PTCT, twice per month. The most recent reporting period available is May, 31 2025. More Short Interest Resources from MarketBeat Related Companies SMMT Short Squeeze GMAB Short Squeeze ITCI Short Squeeze RDY Short Squeeze ASND Short Squeeze VTRS Short Squeeze QGEN Short Squeeze MRNA Short Squeeze BPMC Short Squeeze BBIO 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:PTCT) was last updated on 6/19/2025 by MarketBeat.com Staff From Our PartnersTrump’s Exec Order #14154 could be a “Millionaire-Maker”Former Presidential Advisor, Jim Rickards, says Trump could “rewire our economy and hand millions of Americans...Paradigm Press | SponsoredMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredAn AI run of epic proportions is only getting startedI just put together an urgent new presentation that you need to see right away. 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