NASDAQ:CSTL Castle Biosciences (CSTL) Stock Price, News & Analysis $34.42 +0.71 (+2.11%) Closing price 10/9/2026 04:00 PM EasternExtended Trading$34.42 +0.00 (+0.01%) As of 10/9/2026 07:44 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 Massive. Learn more. Add Compare Share Share Stock Analysis Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsInsider TradesNews and TrendsOptions ChainOwnershipSEC FilingsShort Interest About Castle Biosciences Stock (NASDAQ:CSTL) View Price History Chart DataSkip Price History Chart 1 Day 5 Days 30 Days 90 Days 1 Year Advanced 1 Day 1 Day 5 Days 30 Days 90 Days 1 Year Advanced Show volume Show extended hours Get Castle Biosciences alerts:Sign Up Key Stats Today's Range$33.39▼$34.5250-Day Range$29.03▼$36.7852-Week Range$17.72▼$44.28Volume249,077 shsAverage Volume399,993 shsMarket Capitalization$1.05 billionP/E RatioN/ADividend YieldN/APrice Target$42.00Consensus RatingModerate Buy Company Overview Castle Biosciences, Inc. is a molecular diagnostics company that develops and commercializes tests designed to provide personalized information for patients with cancer and other serious diseases. Its products analyze biological characteristics in tissue samples to help physicians assess disease risk, guide treatment decisions and support patient management. The company’s portfolio includes diagnostic tests for skin cancers, such as DecisionDx-Melanoma for assessing metastatic risk in patients with cutaneous melanoma and DecisionDx-SCC for evaluating metastatic risk in certain cases of cutaneous squamous cell carcinoma. Castle also offers MyPath Melanoma, which is intended to help distinguish benign from malignant melanocytic lesions, and tests for uveal melanoma and other ophthalmic cancers. Castle Biosciences has expanded beyond dermatologic oncology through products such as TissueCypher, a test designed to help predict progression risk in patients with Barrett’s esophagus. The company primarily serves physicians, hospitals and other healthcare providers in the United States. Castle Biosciences was founded in 2008 and is headquartered in Friendswood, Texas. Derek Maetzold is the company’s president and chief executive officer.AI Generated. May Contain Errors. Read More Castle Biosciences Stock Analysis - MarketRank™See Top-Rated MarketRank™ Stocks45th Percentile Overall ScoreCSTL MarketRank™: Castle Biosciences scored higher than 45% of companies evaluated by MarketBeat, and ranked 633rd out of 882 stocks in the healthcare sector. Scores are calculated by averaging available category scores, with extra weight given to analysis and valuation. Analyst's Opinion3.6 / 5Analyst RatingModerate Buy Consensus RatingCastle Biosciences has received a consensus rating of Moderate Buy. The company's average rating score is 2.80, and is based on 1 strong buy rating, 7 buy ratings, 1 hold rating, and 1 sell rating.Upside PotentialCastle Biosciences has a consensus price target of $42.00, representing about 22.0% upside from its current price of $34.42.Amount of Analyst CoverageCastle Biosciences has only been the subject of 2 research reports in the past 90 days.Read more about Castle Biosciences' stock forecast and price target. Earnings and Valuation0.6 / 5Proj. Earnings GrowthGrowing Earnings GrowthEarnings for Castle Biosciences are expected to grow in the coming year, from ($1.29) to ($0.93) per share.Price to Earnings Ratio vs. the MarketThe P/E ratio of Castle Biosciences is -52.15, which means that its earnings are negative and its P/E ratio cannot be compared to companies with positive earnings.Price to Earnings Ratio vs. SectorThe P/E ratio of Castle Biosciences is -52.15, which means that its earnings are negative and its P/E ratio cannot be compared to companies with positive earnings.Price to Book Value per Share RatioCastle Biosciences has a P/B Ratio of 2.13. P/B Ratios below 3 indicates that a company is reasonably valued with respect to its assets and liabilities.Read more about Castle Biosciences' valuation and earnings. Short Interest1.0 / 5Short Interest LevelBearish Percentage of Shares Shorted6.97% of the float of Castle Biosciences has been sold short.Short Interest Ratio / Days to CoverCastle Biosciences has a short interest ratio ("days to cover") of 4.77.Change versus previous monthShort interest in Castle Biosciences has recently increased by 5.28%, indicating that investor sentiment is decreasing significantly. Dividend0.0 / 5Dividend StrengthN/A Dividend YieldCastle Biosciences does not currently pay a dividend.Dividend GrowthCastle Biosciences does not have a long track record of dividend growth. News and Social Media2.6 / 5News Sentiment0.18 News SentimentCastle Biosciences has a news sentiment score of 0.18. This score is calculated as an average of sentiment of articles about the company over the last seven days and ranges from 2 (good news) to -2 (bad news). This is a lower news sentiment than the 0.66 average news sentiment score of Healthcare companies.News Coverage This WeekMarketBeat has tracked 11 news articles for Castle Biosciences this week, compared to 5 articles on an average week.Search InterestOnly 1 people have searched for CSTL on MarketBeat in the last 30 days. This is a decrease of -50% compared to the previous 30 days.MarketBeat Follows2 people have added Castle Biosciences to their MarketBeat watchlist in the last 30 days. This is an increase of 100% compared to the previous 30 days. Company Ownership1.6 / 5Insider TradingSelling Shares Insider Buying vs. Insider SellingIn the past three months, Castle Biosciences insiders have sold more of their company's stock than they have bought. Specifically, they have bought $0.00 in company stock and sold $6,532,090.00 in company stock.Percentage Held by Insiders6.10% of the stock of Castle Biosciences is held by insiders.Percentage Held by Institutions92.60% of the stock of Castle Biosciences is held by institutions. High institutional ownership can be a signal of strong market trust in this company.Read more about Castle Biosciences' insider trading history. Receive CSTL Stock News and Ratings via Email Sign-up to receive the latest news and ratings for Castle Biosciences and its competitors with MarketBeat's FREE daily newsletter. Submit 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. 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(NASDAQ:CSTL) Stock Has Average Price Target of $42.00October 9 at 2:15 AM | americanbankingnews.comReady to give options a try? Your first trade (Ticker included) -INSIDETired of trying tactic after tactic when it comes to options trades... only to be met with market noise and stinging losses? Dave Aquino is giving away the exact 11-hour options strategy he uses in volatile markets. You get the plain English blueprint behind the strategy and the very same "rinse and repeat" ticker he's traded nearly 900 times with a 95.3% success rate. It's so simple to understand, you could trade it tomorrow.October 11 at 1:00 AM | Base Camp Trading (Ad)Castle Biosciences (NASDAQ:CSTL) Stock: Insider Kristen Oelschlager Sells 4,153 SharesOctober 7, 2026 | americanbankingnews.comAnalysts Offer Insights on Healthcare Companies: MiMedx Group (MDXG) and Castle Biosciences (CSTL)October 3, 2026 | theglobeandmail.comCastle Biosciences (NASDAQ:CSTL) Stock: Insider Tobin Juvenal Sells 5,543 SharesOctober 3, 2026 | americanbankingnews.comCastle Biosciences (NASDAQ:CSTL) Insider Sells $35,362.80 in StockOctober 2, 2026 | insidertrades.comTobin Juvenal Sells 3,306 Shares of Castle Biosciences (NASDAQ:CSTL) StockSeptember 17, 2026 | insidertrades.comSee More Headlines CSTL Stock Analysis - Frequently Asked Questions How have CSTL shares performed this year? Castle Biosciences' stock was trading at $38.90 at the beginning of 2026. Since then, CSTL shares have decreased by 11.5% and is now trading at $34.42. How were Castle Biosciences' earnings last quarter? Castle Biosciences, Inc. (NASDAQ:CSTL) posted its quarterly earnings results on Thursday, July, 30th. The company reported ($0.07) EPS for the quarter, beating analysts' consensus estimates of ($0.41) by $0.34. The company had revenue of $99.86 million for the quarter, compared to the consensus estimate of $86.23 million. Castle Biosciences had a negative net margin of 5.43% and a negative trailing twelve-month return on equity of 4.15%. Read the conference call transcript. When did Castle Biosciences IPO? Castle Biosciences (CSTL) raised $60 million in an initial public offering on Wednesday, July 24th 2019. The company issued 4,000,000 shares at $14.00-$16.00 per share. SVB Leerink and Baird served as the underwriters for the IPO and Canaccord Genuity and BTIG were co-managers. Who are Castle Biosciences' major shareholders? Top institutional shareholders of Castle Biosciences include Green Alpha Advisors LLC (0.05%). Insiders that own company stock include Frank Stokes, Tobin W Juvenal, Derek J Maetzold, G Bradley Cole, Kristen M Oelschlager and Daniel Bradbury. View institutional ownership trends. How do I buy shares of Castle Biosciences? Shares of CSTL stock can be purchased through any online brokerage account. Popular online brokerages with access to the U.S. stock market include Charles Schwab, E*TRADE, Fidelity, and Vanguard Brokerage Services. What other stocks do shareholders of Castle Biosciences own? Based on aggregate information from My MarketBeat watchlists, some other companies that Castle Biosciences investors own include NVIDIA (NVDA), Meta Platforms (META), CrowdStrike (CRWD), PayPal (PYPL), Adobe (ADBE), Advanced Micro Devices (AMD) and Broadcom (AVGO). Company Calendar Last Earnings7/30/2026Today10/11/2026Next Earnings (Estimated)11/02/2026Fiscal Year End12/31/2026Get Stock Alerts Health Indicator TradeSmith's Health IndicatorA long-term volatility-based measure designed for securities held 12 months or longer.Green: Strong and healthy uptrend with normal pullbacks.Yellow: Significant pullback but still within expected volatility.Red: Dropped beyond expected volatility; considered unhealthy. Green Zone (2m+) 1-Year History Oct 25 Jan 26 Apr 26 Jul 26 Oct 26 CSTL's financial health is in the Green zone, according to TradeSmith. CSTL has been in this zone for over 2 months. Industry, Sector and Symbol Stock ExchangeNASDAQ SectorHealthcare Industry Healthcare Providers & Services Sub-IndustryHealthcare Services Current SymbolNASDAQ:CSTL CIK1447362 Webcastlebiosciences.com Phone(866) 788-9007FaxN/AEmployees1,002Year Founded2008Price Target and Rating Average Price Target for Castle Biosciences$42.00 High Price Target$52.00 Low Price Target$35.00 Potential Upside/Downside+22.0%Consensus RatingModerate Buy Rating Score (0-4)2.80 Research Coverage10 Analysts Profitability EPS (Trailing Twelve Months)($0.66) Trailing P/E RatioN/A Forward P/E RatioN/A P/E GrowthN/ANet Income-$24.16 million Net Margins-5.43% Pretax Margin-5.37% Return on Equity-4.15% Return on Assets-3.45% Debt Debt-to-Equity Ratio0.02 Current Ratio6.04 Quick Ratio5.85 Sales & Book Value Annual Sales$344.23 million Price / Sales3.05 Cash Flow$1.11 per share Price / Cash Flow30.92 Book Value$16.13 per share Price / Book2.13Miscellaneous Outstanding Shares30,550,000Free Float28,686,000Market Cap$1.05 billion OptionableOptionable Beta0.94 Social Links 7 Best Space Stocks to Own in 2026The space race is growing fast, and you don’t have to have gotten in early on SpaceX to profit. 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