Catalyst Pharmaceuticals (CPRX) Short Interest Ratio & Short Volume $21.12 -0.21 (-0.98%) Closing price 08/1/2025 04:00 PM EasternExtended Trading$21.06 -0.05 (-0.26%) As of 08/1/2025 07:59 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 EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Catalyst Pharmaceuticals Short Interest DataCatalyst Pharmaceuticals (CPRX) has a short interest of 8.92 million shares. This marks a 9.18% increase in short interest from the previous month. The short interest ratio (days to cover) is 7.4, indicating that it would take 7.4 days of the average trading volume of 1.21 million shares to cover all short positions.Current Short Interest8,920,000 sharesPrevious Short Interest8,170,000 sharesChange Vs. Previous Month+9.18%Dollar Volume Sold Short$186.87 millionShort Interest Ratio7.4 Days to CoverLast Record DateJuly 15, 2025Outstanding Shares121,970,000 sharesPercentage of Shares Shorted7.31%Today's Trading Volume999,536 sharesAverage Trading Volume1,210,948 sharesToday's Volume Vs. Average83% Short Selling Catalyst Pharmaceuticals? Sign up to receive the latest short interest report for Catalyst Pharmaceuticals and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartCPRX Short Interest Over TimeCPRX Days to Cover Over TimeCPRX Percentage of Float Shorted Over Time Catalyst 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 7/15/20258,920,000 shares $186.87 million +9.2%N/A7.4 $20.95 6/30/20258,170,000 shares $177.29 million +5.7%7.5%6.6 $21.70 6/15/20257,730,000 shares $181.89 million +5.2%7.1%6.2 $23.53 5/31/20257,350,000 shares $182.94 million -1.1%6.9%5.8 $24.89 5/15/20257,430,000 shares $176.69 million -7.2%7.0%5.8 $23.78 4/30/20258,010,000 shares $194.56 million +2.8%N/A6.3 $24.29 4/15/20257,790,000 shares $180.96 million -1.8%7.3%6.3 $23.23 3/31/20257,930,000 shares $192.30 million +9.7%7.5%5.6 $24.25 3/15/20257,230,000 shares $151.97 million +16.1%6.8%5.6 $21.02 2/28/20256,230,000 shares $142.60 million +8.9%5.9%5.5 $22.89 Get the Latest News and Ratings for CPRX and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Catalyst Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 2/15/20255,720,000 shares $133.10 million +6.9%5.4%5.3 $23.27 1/31/20255,350,000 shares $120.70 million -19.3%N/A4.7 $22.56 1/15/20256,630,000 shares $152.89 million -0.8%N/A6.1 $23.06 12/31/20246,680,000 shares $139.41 million +12.5%N/A6.9 $20.87 12/15/20245,940,000 shares $127.00 million -2.5%N/A6.6 $21.38 11/30/20246,090,000 shares $134.41 million +7.2%N/A6.4 $22.07 11/15/20245,680,000 shares $117.01 million -5.5%N/A6 $20.60 10/31/20246,010,000 shares $131.02 million +0.8%5.8%6.2 $21.80 10/15/20245,960,000 shares $126.23 million +3.7%5.8%6.1 $21.18 9/30/20245,750,000 shares $114.31 million -2.9%5.6%5.8 $19.88 9/15/20245,920,000 shares $119.70 million +2.6%5.8%5.9 $20.22 8/31/20245,770,000 shares $116.84 million +14.3%5.6%5.3 $20.25 8/15/20245,050,000 shares $100.55 million +4.8%4.9%4.5 $19.91 7/31/20244,820,000 shares $83.10 million -9.9%4.7%4.4 $17.24 7/15/20245,350,000 shares $89.61 million +0.9%5.3%4.6 $16.75 6/30/20245,300,000 shares $82.10 million -22.2%5.2%4.4 $15.49 6/15/20246,810,000 shares $102.56 million -6.3%6.7%5.5 $15.06 5/31/20247,270,000 shares $117.56 million -9.0%7.2%6.2 $16.17 5/15/20247,990,000 shares $133.11 million +3.6%7.9%6.1 $16.66 4/30/20247,710,000 shares $116.04 million +23.0%7.6%5.9 $15.05 4/15/20246,270,000 shares $96.50 million +3.6%6.2%4.7 $15.39 3/31/20246,050,000 shares $96.44 million +3.8%6.1%4.1 $15.94 3/15/20245,830,000 shares $93.69 million -9.9%5.8%3.9 $16.07 2/29/20246,470,000 shares $103.71 million +14.1%6.5%4.3 $16.03 2/15/20245,670,000 shares $78.76 million +20.9%6.2%4.1 $13.89 1/31/20244,690,000 shares $67.54 million -21.3%5.1%3.3 $14.40 1/15/20245,960,000 shares $86.36 million +5.9%6.5%4 $14.49 12/31/20235,630,000 shares $94.64 million -21.6%6.1%4 $16.81 12/15/20237,180,000 shares $103.25 million +4.7%7.9%5.8 $14.38 11/30/20236,860,000 shares $98.99 million +3.0%7.5%5.7 $14.43China just unlocked Nvidia’s AI chips—what that means for you (Ad)Tired of Missing Big AI Moves Like Nvidia? 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Results proven.Watch the system in action. 11/15/20236,660,000 shares $90.91 million +3.7%7.3%5.5 $13.65 10/31/20236,420,000 shares $79.67 million +2.4%7.0%5.2 $12.41 10/15/20236,270,000 shares $80.13 million -1.3%6.8%5.2 $12.78 9/30/20236,350,000 shares $74.23 million -20.0%6.9%5.2 $11.69 9/15/20237,940,000 shares $98.93 million +10.9%8.7%6.2 $12.46 8/31/20237,160,000 shares $100.53 million +6.1%7.2%4.7 $14.04 8/15/20236,750,000 shares $101.12 million +2.4%6.8%4.2 $14.98 7/31/20236,590,000 shares $91.14 million -8.3%6.6%3.5 $13.83 7/15/20237,190,000 shares $92.46 million -9.1%7.2%3.7 $12.86 6/30/20237,910,000 shares $106.31 million -6.2%8.0%4 $13.44 6/15/20238,430,000 shares $104.28 million -8.0%8.5%4.3 $12.37 5/31/20239,160,000 shares $105.80 million -3.5%9.2%4.7 $11.55 5/15/20239,490,000 shares $124.70 million -15.2%9.6%4.9 $13.14 4/30/202311,190,000 shares $178.14 million +2.2%11.2%6.5 $15.92 4/15/202310,950,000 shares $193.71 million -3.4%11.0%5 $17.69 3/31/202311,330,000 shares $187.85 million +15.9%11.4%5 $16.58 3/15/20239,780,000 shares $140.25 million -5.7%9.9%4.1 $14.34 2/28/202310,370,000 shares $158.25 million +6.5%10.6%4.4 $15.26 2/15/20239,740,000 shares $149.61 million +12.9%10.0%3.8 $15.36 1/31/20238,630,000 shares $133.68 million -15.3%8.8%3.1 $15.49 1/15/202310,190,000 shares $214.50 million -3.0%10.4%3.9 $21.05 12/30/202210,510,000 shares $195.49 million +38.8%10.8%4.7 $18.60 12/15/20227,570,000 shares $127.48 million -4.2%7.7%3.2 $16.84 11/30/20227,900,000 shares $132.48 million +18.4%8.1%2.5 $16.77 11/15/20226,670,000 shares $105.99 million -17.3%6.8%2 $15.89 10/31/20228,060,000 shares $111.79 million -7.6%8.4%2.5 $13.87 10/15/20228,720,000 shares $109.44 million -3.8%9.0%2.7 $12.55 9/30/20229,060,000 shares $116.24 million +82.3%9.4%2.7 $12.83 9/15/20224,970,000 shares $67.69 million -20.1%5.2%1.5 $13.62 8/31/20226,220,000 shares $84.22 million -8.4%6.6%2.9 $13.54 8/15/20226,790,000 shares $96.62 million -3.7%7.2%3.7 $14.23 7/31/20227,050,000 shares $72.19 million -20.3%7.4%4.5 $10.24 7/15/20228,840,000 shares $75.76 million -13.3%9.3%6.2 $8.57 6/30/202210,190,000 shares $71.43 million +4.3%10.7%8.8 $7.01 6/15/20229,770,000 shares $63.60 million +11.0%10.3%8.4 $6.51 5/31/20228,800,000 shares $63.36 million +18.1%9.3%7.8 $7.20 5/15/20227,450,000 shares $51.48 million +45.8%7.8%6.4 $6.91 4/30/20225,110,000 shares $38.94 million +10.6%5.4%4.3 $7.62 4/15/20224,620,000 shares $38.85 million +1.1%4.9%4 $8.41 3/31/20224,570,000 shares $37.89 million -3.8%4.8%3.9 $8.29 3/15/20224,750,000 shares $35.82 million -9.7%5.0%4.2 $7.54 2/28/20225,260,000 shares $41.03 million +2.7%5.5%4.6 $7.80 2/15/20225,120,000 shares $39.53 million +18.2%5.4%4.6 $7.72 1/31/20224,330,000 shares $24.94 million +13.7%4.5%4 $5.76 1/15/20223,810,000 shares $23.77 million +6.1%N/A3.9 $6.24 12/31/20213,590,000 shares $24.30 million -15.1%3.8%3.9 $6.77 12/15/20214,230,000 shares $29.27 million +3.9%4.4%4.1 $6.92 11/30/20214,070,000 shares $28.49 million -2.4%4.3%4.6 $7.00 11/15/20214,170,000 shares $30.44 million -2.1%4.4%4.7 $7.30 10/29/20214,260,000 shares $25.13 million -3.4%4.5%5.1 $5.90China just unlocked Nvidia’s AI chips—what that means for you (Ad)Tired of Missing Big AI Moves Like Nvidia? 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Results proven.Watch the system in action. 10/15/20214,410,000 shares $26.59 million -7.0%4.6%5.3 $6.03 9/30/20214,740,000 shares $25.12 million -9.2%5.0%5.5 $5.30 9/15/20215,220,000 shares $26.10 million -0.8%5.5%6.1 $5.00 8/31/20215,260,000 shares $28.98 million -7.4%5.5%5.5 $5.51 8/13/20215,680,000 shares $34.31 million -2.1%5.9%5.7 $6.04 7/30/20215,800,000 shares $33.87 million +1.9%6.0%5.2 $5.84 7/15/20215,690,000 shares $31.41 million -11.8%5.9%4.8 $5.52 6/30/20216,450,000 shares $37.09 million -30.2%6.7%5.2 $5.75 6/15/20219,240,000 shares $52.48 million -3.8%9.6%7.5 $5.68 5/28/20219,600,000 shares $53.09 million -9.9%10.0%7.1 $5.53 5/14/202110,660,000 shares $53.09 million -2.0%11.1%7.3 $4.98 4/30/202110,880,000 shares $51.68 million -7.1%11.3%7.2 $4.75 4/15/202111,710,000 shares $52.23 million -5.3%12.1%7 $4.46 3/31/202112,370,000 shares $53.69 million +29.5%12.8%7 $4.34 3/15/20219,550,000 shares $37.15 million +13.7%9.9%4.9 $3.89 2/26/20218,400,000 shares $32.76 million -8.8%8.7%4.5 $3.90 2/12/20219,210,000 shares $39.83 million -6.6%9.6%4.9 $4.33 1/29/20219,860,000 shares $35.50 million -2.7%10.2%5.3 $3.60 1/15/202110,130,000 shares $35.76 million -0.3%10.5%6 $3.53 12/31/202010,160,000 shares $34.75 million -17.3%10.5%6.3 $3.42 12/15/202012,280,000 shares $47.03 million -4.2%12.7%7.4 $3.83 11/30/202012,820,000 shares $47.43 million -4.6%13.3%8.4 $3.70 11/15/202013,440,000 shares $45.70 million +0.1%13.9%8.8 $3.40 10/30/202013,430,000 shares $41.77 million +4.9%13.9%7.9 $3.11 10/15/202012,800,000 shares $40.83 million -6.2%13.3%6.6 $3.19 9/30/202013,640,000 shares $40.51 million +17.2%14.2%6.9 $2.97 9/15/202011,640,000 shares $39.11 million -7.4%12.1%6.2 $3.36 8/31/202012,570,000 shares $41.23 million +2.0%13.1%6.3 $3.28 8/14/202012,330,000 shares $42.79 million +7.0%12.8%6.1 $3.47 CPRX Short Interest - Frequently Asked Questions What is Catalyst Pharmaceuticals' current short interest? Short interest is the volume of Catalyst Pharmaceuticals shares that have been sold short but have not yet been covered or closed out. As of July 15th, traders have sold 8,920,000 shares of CPRX short. Learn More on Catalyst Pharmaceuticals' current short interest. What is a good short interest ratio for Catalyst 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. CPRX shares currently have a short interest ratio of 7.0. Learn More on Catalyst Pharmaceuticals's short interest ratio. Which institutional investors are shorting Catalyst Pharmaceuticals? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Catalyst Pharmaceuticals: Simplex Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. Is Catalyst Pharmaceuticals' short interest increasing or decreasing? Catalyst Pharmaceuticals saw a increase in short interest in July. As of July 15th, there was short interest totaling 8,920,000 shares, an increase of 9.2% from the previous total of 8,170,000 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 Catalyst Pharmaceuticals' short interest compare to its competitors? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Catalyst Pharmaceuticals: Verona Pharma PLC American Depositary Share (4.77%), BridgeBio Pharma, Inc. (10.26%), Blueprint Medicines Corporation (5.95%), Roivant Sciences Ltd. (10.56%), Legend Biotech Corporation Sponsored ADR (4.57%), Elanco Animal Health Incorporated (4.75%), Regencell Bioscience Holdings Limited (9.57%), Revolution Medicines, Inc. (7.33%), Grifols, S.A. (0.96%), TG Therapeutics, Inc. (15.22%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Coinbase Global, Inc. ($5.11 billion), Charter Communications, Inc. ($4.76 billion), Reddit Inc. ($2.84 billion), SoFi Technologies, Inc. ($2.79 billion), Seagate Technology Holdings PLC ($2.79 billion), Live Nation Entertainment, Inc. ($2.67 billion), Rocket Lab Corporation ($2.49 billion), AST SpaceMobile, Inc. ($2.12 billion), Moderna, Inc. ($2.09 billion), and Omnicom Group Inc. ($2.04 billion). View all of the most shorted stocks. What does it mean to sell short Catalyst Pharmaceuticals stock? Short selling CPRX is an investing strategy that aims to generate trading profit from Catalyst Pharmaceuticals as its price is falling. CPRX shares are trading down $0.21 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 Catalyst Pharmaceuticals? A short squeeze for Catalyst 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 CPRX, which in turn drives the price of the stock up even further. How often is Catalyst 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 CPRX, twice per month. The most recent reporting period available is July, 15 2025. More Short Interest Resources from MarketBeat Related Companies VRNA Short Interest Data BBIO Short Interest Data BPMC Short Interest Data ROIV Short Interest Data LEGN Short Interest Data ELAN Short Interest Data RGC Short Interest Data RVMD Short Interest Data GRFS Short Interest Data TGTX 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:CPRX) was last updated on 8/2/2025 by MarketBeat.com Staff From Our PartnersElon’s Secret Social Security BombshellTo All Americans Born Before April 16th, 1963: Did Trump Just Give The Green Light To Radically RE-DO Social S...Banyan Hill Publishing | SponsoredElon’s BIGGEST warning yet?Tesla's About to Prove Everyone Wrong... 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