Castle Biosciences (CSTL) Short Interest Ratio & Short Volume $25.75 -0.40 (-1.53%) Closing price 02/21/2025 04:00 PM EasternExtended Trading$25.74 0.00 (-0.02%) As of 02/21/2025 05:30 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 InterestTrends Castle Biosciences Short Interest DataCastle Biosciences (CSTL) has a short interest of 1.71 million shares. This marks a 2.40% increase in short interest from the previous month. The short interest ratio (days to cover) is 4.5, indicating that it would take 4.5 days of the average trading volume of 344,013 shares to cover all short positions.Current Short Interest1,710,000 sharesPrevious Short Interest1,670,000 sharesChange Vs. Previous Month+2.40%Dollar Volume Sold Short$48.34 millionShort Interest Ratio4.5 Days to CoverLast Record DateJanuary 31, 2025Outstanding Shares28,010,000 sharesPercentage of Shares Shorted6.10%Today's Trading Volume294,905 sharesAverage Trading Volume344,013 sharesToday's Volume Vs. Average86% Short Selling Castle Biosciences? Sign up to receive the latest short interest report for Castle Biosciences and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartCSTL Short Interest Over TimeCSTL Days to Cover Over TimeCSTL Percentage of Float Shorted Over Time Castle Biosciences Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 1/31/20251,710,000 shares $48.34 million +2.4%N/A4.5 $28.27 1/15/20251,670,000 shares $41.78 million +1.2%N/A4.1 $25.02 12/31/20241,650,000 shares $43.97 million -1.8%N/A4.2 $26.65 12/15/20241,680,000 shares $48.50 million -8.7%N/A4.5 $28.87 11/30/20241,840,000 shares $55.72 million +7.6%N/A4.7 $30.28 11/15/20241,710,000 shares $48.05 million +6.2%N/A4.4 $28.10 10/31/20241,610,000 shares $55.82 million -8.0%N/A4.1 $34.67 10/15/20241,750,000 shares $58.59 million +8.7%N/A4.2 $33.48 9/30/20241,610,000 shares $45.92 million -6.4%N/A4.1 $28.52 9/15/20241,720,000 shares $53.63 million -2.8%N/A4.1 $31.18 Get the Latest News and Ratings for CSTL and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Castle Biosciences and its competitors with MarketBeat's FREE daily newsletter. 8/31/20241,770,000 shares $52.52 million +4.1%N/A4.4 $29.67 8/15/20241,700,000 shares $46.14 million +21.4%N/A4.3 $27.14 7/31/20241,400,000 shares $33.78 million -22.7%N/A3.8 $24.13 7/15/20241,810,000 shares $34.12 million +54.7%N/A5.9 $18.85 6/30/20241,170,000 shares $25.47 million +2.6%N/A4.3 $21.77 6/15/20241,140,000 shares $26.13 million -0.9%N/A4.9 $22.92 5/31/20241,150,000 shares $26.75 million -10.9%N/A5.1 $23.26 5/15/20241,290,000 shares $31.42 million -10.4%N/A5 $24.36 4/30/20241,440,000 shares $30.37 million -1.4%N/A5.8 $21.09 4/15/20241,460,000 shares $28.08 million +2.1%N/A6.3 $19.23 3/31/20241,430,000 shares $31.67 million +0.7%N/A5.7 $22.15 3/15/20241,420,000 shares $26.77 million +17.4%N/A5.6 $18.85 2/29/20241,210,000 shares $21.85 million -3.2%N/A4.6 $18.06 2/15/20241,250,000 shares $31.10 million +0.8%5.0%5.5 $24.88 1/31/20241,240,000 shares $28.62 million +29.3%5.0%5.4 $23.08 1/15/2024958,800 shares $19.20 million +19.8%3.8%3.7 $20.03 12/31/2023800,300 shares $17.27 million -18.1%3.2%2.9 $21.58 12/15/2023977,300 shares $19.61 million -17.2%3.9%3.6 $20.07 11/30/20231,180,000 shares $23.59 million -9.2%4.7%4.7 $19.99 11/15/20231,300,000 shares $24.99 million -9.1%5.2%5.2 $19.22 10/31/20231,430,000 shares $22.34 million +28.8%N/A5.6 $15.62 10/15/20231,110,000 shares $13.74 million +11.6%N/A4 $12.38 9/30/2023994,800 shares $16.80 million +19.4%N/A3 $16.89 9/15/2023833,200 shares $14.41 million +16.2%N/A1.5 $17.30 8/31/2023716,800 shares $14.29 million -3.6%N/A1.1 $19.93 8/15/2023743,500 shares $13.97 million -14.1%N/A0.9 $18.79 7/31/2023865,500 shares $14.58 million +1.3%N/A1 $16.85 7/15/2023854,500 shares $13.63 million +32.2%N/A1.1 $15.95 6/30/2023646,400 shares $8.87 million -26.8%N/A0.9 $13.72 6/15/2023883,200 shares $11.83 million +16.4%N/A2 $13.40Ex-CIA Advisor: Trump 2.0 Could “Send Gold to $10,000” (Ad)Experts forecast gold's price racing to $4,000… and an ex-CIA advisor predicts we'll see gold hit $10,000. Should you sit on the sideline while this is happening?That's why we put together a 100% FREE 2025 Gold Guide to show you exactly how to protect and grow y 5/31/2023758,600 shares $18.53 million -13.6%N/A2 $24.43 5/15/2023878,100 shares $20.69 million -11.0%N/A6 $23.56 4/30/2023986,400 shares $22.32 million +0.7%N/A6.9 $22.63 4/15/2023979,400 shares $22.11 million -4.9%N/A6.8 $22.58 3/31/20231,030,000 shares $23.40 million -2.8%N/A7.1 $22.72 3/15/20231,060,000 shares $24.01 million +23.0%N/A6.8 $22.65 2/28/2023862,000 shares $21.71 million -25.0%N/A5.6 $25.18 2/15/20231,150,000 shares $30.94 million +4.6%N/A7.8 $26.90 1/31/20231,100,000 shares $29.79 million -2.7%N/A6.4 $27.08 1/15/20231,130,000 shares $30.75 million -5.0%N/A6 $27.21 12/30/20221,190,000 shares $28.01 million +5.3%4.9%5.9 $23.54 12/15/20221,130,000 shares $27.90 million +5.6%4.6%5.6 $24.69 11/30/20221,070,000 shares $25.24 million +0.9%4.4%5.3 $23.59 11/15/20221,060,000 shares $24.41 million -9.4%4.3%5.3 $23.03 10/31/20221,170,000 shares $29.86 million -10.0%4.8%5.9 $25.52 10/15/20221,300,000 shares $28.63 million +4.0%5.3%6.6 $22.02 9/30/20221,250,000 shares $32.60 million +7.8%5.3%6.3 $26.08 9/15/20221,160,000 shares $32.97 million -1.7%4.9%4.9 $28.42 8/31/20221,180,000 shares $34.22 million -1.7%5.0%4.5 $29.00 8/15/20221,200,000 shares $40.19 million -17.2%5.1%4.1 $33.49 7/31/20221,450,000 shares $40.54 million +10.7%6.1%4.5 $27.96 7/15/20221,310,000 shares $32.40 million -1.5%5.4%3.6 $24.73 6/30/20221,330,000 shares $29.19 million +1.5%5.5%3.1 $21.95 6/15/20221,310,000 shares $22.22 million +3.2%5.4%3.2 $16.96 5/31/20221,270,000 shares $28.28 million -1.6%5.4%3.6 $22.27 5/15/20221,290,000 shares $25.43 million -2.3%5.5%3.9 $19.71 4/30/20221,320,000 shares $29.49 million +8.2%5.8%4.3 $22.34 4/15/20221,220,000 shares $31.65 million -9.6%5.3%4.1 $25.94 3/31/20221,350,000 shares $60.56 million -6.9%5.9%6.2 $44.86 3/15/20221,450,000 shares $52.87 million -4.6%6.3%6.8 $36.46 2/28/20221,520,000 shares $65.80 million +4.1%6.7%6.6 $43.29 2/15/20221,460,000 shares $62.78 million +3.6%6.4%5.8 $43.00 1/31/20221,410,000 shares $60.98 million +19.5%6.2%5.3 $43.25 1/15/20221,180,000 shares $43.29 million +22.6%6.5%4.9 $36.69 12/31/2021962,800 shares $41.28 million -12.5%5.4%4.3 $42.87 12/15/20211,100,000 shares $45.44 million +5.8%6.2%5 $41.31 11/30/20211,040,000 shares $42.98 million +24.5%5.8%4.9 $41.33 11/15/2021835,200 shares $43.76 million -1.3%4.7%4.5 $52.40 10/29/2021846,200 shares $52.76 million -14.8%4.8%5 $62.35 10/15/2021992,900 shares $63.13 million -16.6%5.6%6.3 $63.58 9/30/20211,190,000 shares $79.14 million -4.0%6.7%7.5 $66.50 9/15/20211,240,000 shares $92.65 million -12.1%7.0%7 $74.72 8/31/20211,410,000 shares $108.19 million No Change8.0%7.5 $76.73 8/13/20211,410,000 shares $90.86 million +1.4%8.0%6.9 $64.44 7/30/20211,390,000 shares $97.09 million -6.7%7.9%6 $69.85 7/15/20211,490,000 shares $96.76 million -3.3%8.5%6.1 $64.94 6/30/20211,540,000 shares $112.93 million +14.9%8.8%6.1 $73.33 6/15/20211,340,000 shares $97.27 million -1.5%7.7%5.2 $72.59 5/28/20211,360,000 shares $81.50 million +8.8%7.8%4.8 $59.93 5/14/20211,250,000 shares $62.59 million -44.2%N/A4 $50.07Ex-CIA Advisor: Trump 2.0 Could “Send Gold to $10,000” (Ad)Experts forecast gold's price racing to $4,000… and an ex-CIA advisor predicts we'll see gold hit $10,000. Should you sit on the sideline while this is happening?That's why we put together a 100% FREE 2025 Gold Guide to show you exactly how to protect and grow y 4/30/20212,240,000 shares $152.48 million +1.8%14.6%7.3 $68.07 4/15/20212,200,000 shares $150.79 million -7.2%14.3%7.1 $68.54 3/31/20212,370,000 shares $147.37 million +0.9%15.5%7.4 $62.18 3/15/20212,350,000 shares $150.85 million +54.6%N/A7.2 $64.19 2/26/20211,520,000 shares $113.22 million +7.0%N/A4.3 $74.49 2/12/20211,420,000 shares $133.76 million -4.1%N/A4.4 $94.20 1/29/20211,480,000 shares $101.39 million -2.6%9.3%4.6 $68.51 1/15/20211,520,000 shares $114.94 million -9.0%9.6%5.2 $75.62 12/31/20201,670,000 shares $114.91 million +44.0%11.3%6.1 $68.81 12/15/20201,160,000 shares $71.83 million -2.5%7.9%4.5 $61.92 11/30/20201,190,000 shares $52.92 million -4.0%8.4%6.2 $44.47 11/15/20201,240,000 shares $62.45 million -1.6%8.9%6.8 $50.36 10/30/20201,260,000 shares $59.36 million +22.3%9.1%7 $47.11 10/15/20201,030,000 shares $54.37 million +40.4%7.5%5.9 $52.79 9/30/2020733,800 shares $37.75 million +40.3%5.4%4.2 $51.45 9/15/2020522,900 shares $25.35 million -23.5%3.9%2.5 $48.48 8/31/2020683,200 shares $31.24 million -18.1%5.1%3.1 $45.73 8/14/2020834,000 shares $34.46 million -5.1%6.5%4 $41.32 7/31/2020879,200 shares $34.04 million -6.5%7.0%3.9 $38.72 7/15/2020939,800 shares $40.38 million -15.3%7.6%4.1 $42.97 6/30/20201,110,000 shares $41.84 million -12.6%9.6%4.9 $37.69 6/15/20201,270,000 shares $47.02 million -1.6%13.0%6.7 $37.02 5/29/20201,290,000 shares $49.57 million +13.2%13.3%7 $38.43 5/15/20201,140,000 shares $40.36 million +17.0%12.0%6.1 $35.40 4/30/2020974,800 shares $29.73 million +12.2%10.3%6 $30.50 4/15/2020868,800 shares $25.79 million +1.9%9.2%5.5 $29.69 3/31/2020852,300 shares $25.10 million +35.8%9.0%5.4 $29.45 3/13/2020627,700 shares $17.61 million +38.9%6.7%3.5 $28.05 2/28/2020451,800 shares $11.65 million -0.8%4.8%3.7 $25.79 CSTL Short Interest - Frequently Asked Questions What is Castle Biosciences' current short interest? Short interest is the volume of Castle Biosciences shares that have been sold short but have not yet been covered or closed out. As of January 31st, investors have sold 1,710,000 shares of CSTL short. Learn More on Castle Biosciences' current short interest. What is a good short interest ratio for Castle Biosciences? 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. CSTL shares currently have a short interest ratio of 4.0. Learn More on Castle Biosciences's short interest ratio. Which institutional investors are shorting Castle Biosciences? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Castle Biosciences: Wolverine Trading LLC, Torno Capital LLC, Group One Trading LLC, Citadel Advisors LLC, and Concourse Financial Group Securities Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. Is Castle Biosciences' short interest increasing or decreasing? Castle Biosciences saw a increase in short interest during the month of January. As of January 31st, there was short interest totaling 1,710,000 shares, an increase of 2.4% from the previous total of 1,670,000 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 Castle Biosciences' short interest compare to its competitors? Here is how the short interest of companies in the industry of "healthcare" compare to Castle Biosciences: LifeStance Health Group, Inc. (8.09%), Privia Health Group, Inc. (4.63%), Teladoc Health, Inc. (13.32%), PACS Group, Inc. (9.17%), Addus HomeCare Co. (2.77%), Progyny, Inc. (16.12%), GeneDx Holdings Corp. (9.82%), Viridian Therapeutics, Inc. (13.74%), agilon health, inc. (6.67%), Fortrea Holdings Inc. (6.84%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: AppLovin Co. ($5.21 billion), Charter Communications, Inc. ($4.07 billion), Reddit, Inc. ($3.33 billion), The Kroger Co. ($2.67 billion), Cencora, Inc. ($2.29 billion), Hims & Hers Health, Inc. ($2.17 billion), SoFi Technologies, Inc. ($1.99 billion), Live Nation Entertainment, Inc. ($1.87 billion), Rivian Automotive, Inc. ($1.76 billion), and Moderna, Inc. ($1.60 billion). View all of the most shorted stocks. What does it mean to sell short Castle Biosciences stock? Short selling CSTL is an investing strategy that aims to generate trading profit from Castle Biosciences as its price is falling. CSTL shares are trading down $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 Castle Biosciences? A short squeeze for Castle Biosciences 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 CSTL, which in turn drives the price of the stock up even further. How often is Castle Biosciences' 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 CSTL, twice per month. The most recent reporting period available is January, 31 2025. More Short Interest Resources from MarketBeat Related Companies LFST Short Interest Data PRVA Short Interest Data TDOC Short Interest Data PACS Short Interest Data ADUS Short Interest Data PGNY Short Interest Data WGS Short Interest Data VRDN Short Interest Data AGL Short Interest Data FTRE 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:CSTL) was last updated on 2/22/2025 by MarketBeat.com Staff From Our PartnersSecret financial plot unfolding in Washington DC… [DEVELOPING]What stocks are next up to soar in 2025? I believe I’ve found the answer - and it might surprise you. 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