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CSTL · Castle Biosciences Inc

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$32.93 +0.61 (+1.89%) At close · Aug 20
Market Cap
$945.81M
Shares
30.55M

Price & Indicators

Indicators
Price
Panels
Event markers
20d MA 50d MA 200d MA Earnings Filing Insider Congress Investor day
Close$32.93 Open$32.41 Day$32.41–34.01 52W close$18.15–43.04 Avg vol 30d444K Short int1.6M · 5.1% float · 3.2d Short vol55% Last earningsJul 30, 2026 DataJan 2020–Aug 2026 Filing10-Q · Jul 30

Up next

Next earnings call
Oct 26, 2026 Est · unconfirmed · in 9 wks
FQ3-26 quarter ends
~Sep 30, 2026 Est
Latest filing: 10-Q
filed Jul 30, 2026

AI Brief

TL;DR.

Bullish
    Bearish

      AI-generated from the earnings call and 8-K · may contain errors · not investment advice

      Ask ALVIS about this →

      Equibles Rating

      blended score · not investment advice
      Overall
      Neutral
      SellHoldBuy
      Technical Neutral Momentum Strong Sentiment Bearish Fundamentals Strong Quant / Vol Very High
      Market backdrop VIX 14.9 · calm Equity put/call 0.52
      Technical
      price trend
      Neutral
      50 / 200-day cross No cross
      Price vs 200-day avg +12%
      above
      Price vs 50-day avg +29%
      above
      RSI (14) 68
      neutral
      MACD trend Negative
      52-week position 59%
      mid-range
      Volume (OBV) Confirms
      volume backs price
      Momentum
      relative strength
      Strong
      1-month return +29%
      trailing
      6-month return +11%
      trailing
      YTD return −15%
      this year
      Relative strength 0%
      vs S&P · 6-mo
      Sentiment
      smart money
      Bearish
      Trend (MA cross) No cross
      50d $26 › 200d $29 — 200d above 50d
      Institutional flow Distributing
      -6% holders QoQ · +24 funds added
      Insider flow Distributing
      Net -$741.5K over 90 days · 100% sells
      Short interest Rising
      5.11% of float · ▲ +9.9% MoM · 3.2 days cover
      Volume signal Normal
      Volume near normal
      Institution breadth Steady
      176 holders — mid 3-yr range
      Squeeze score 67
      elevated · 0–100
      Fundamentals
      Strong
      Revenue growth +4%
      Y/Y
      Gross margin 15%
      expanding
      EPS growth −234%
      Y/Y
      Free cash flow $28.3M
      Balance sheet $106.7M
      net cash
      Quant / Vol
      risk profile
      Very High
      Volatility 57%
      annualized · 1-yr
      Max drawdown −58%
      past year
      ATR 5.0%
      of price · 14-day

      Blended from price, momentum, positioning, fundamentals & volatility · daily-close · not investment advice. Market backdrop is context, not part of the score.

      Guidance & track record

      Beat or met 3 of last 3
      Latest guidance · from the 8-K filed Jul 30, 2026
      Total revenue · full year 2026 Initiated $365M – $375M
      prior FY $344.23M midpoint +7.5% Y/Y
      Prior guidance period ended · from the 8-K filed Nov 3, 2025
      Total revenue · full-year 2025 $327M – $335M
      Guided vs delivered · last 3 settled
      Total revenue full-year 2025
      guided $327M – $335M
      $344.23M Beat +4.0%
      Total revenue 2024
      guided $235M – $240M
      $332.07M Beat +39.8%
      Total revenue full year 2023
      guided at least $200M
      $219.79M In line

      Guidance from company 8-Ks · delivered figures from as-reported statements · no analyst estimates involved.

      Technicals

      trend & momentum for long-term holders Neutral
      1 · 4 · 2
      50 / 200-day cross
      No cross Neutral
      Price vs 200-day avg
      +12% Bullish
      Price vs 50-day avg
      +29% Bullish
      RSI (14)
      68 Neutral
      MACD trend
      Negative Bearish
      52-week position
      59% Neutral
      Volume (OBV)
      Confirms Neutral
      Market signals — smart money & positioning
      Bearish · 3 of 6
      Trend (MA cross) No cross
      50d $26 › 200d $29 — 200d above 50d
      Institutional flow Distributing
      -6% holders QoQ · +24 funds added
      Insider flow Distributing
      Net -$741.5K over 90 days · 100% sells
      Short interest Rising
      5.11% of float · ▲ +9.9% MoM · 3.2 days cover
      Volume signal Normal
      Volume near normal
      Institution breadth Steady
      176 holders — mid 3-yr range
      Price context
      position in its 52-week range
      Range low $18 Now $33 · 59% Range high $43
      vs 200-day avg +12% vs 50-day avg +29%

      Illustrative technical + ownership context — a signal mix, not investment advice.

      Key metrics

      the company's own KPIs, from written earnings releases and filings
      Metric Latest Period YoY
      Cash Position $266.8M As of June 30, 2026 —
      DecisionDx-Melanoma test reports delivered in 2026 20,301 Six Months Ended June 30, 2026 —
      DecisionDx-SCC test reports delivered in 2026 7,713 Six Months Ended June 30, 2026 —
      DecisionDx-UM test reports delivered in 2026 974 Six Months Ended June 30, 2026 —
      MyPath Melanoma test reports delivered in 2026 2,034 Six Months Ended June 30, 2026 —
      TissueCypher Barrett's Esophagus test reports delivered in 2026 26,733 Six Months Ended June 30, 2026 —
      DecisionDx-Melanoma test reports delivered in 2025 39,083 Twelve Months Ended Dec. 31, 2025 —
      DecisionDx-SCC test reports delivered in 2025 17,294 Twelve Months Ended Dec. 31, 2025 —
      DecisionDx-UM test reports delivered in 2025 1,769 Twelve Months Ended Dec. 31, 2025 —
      IDgenetix test reports delivered in 2025 3,605 Twelve Months Ended Dec. 31, 2025 —
      MyPath Melanoma test reports delivered in 2025 4,288 Twelve Months Ended Dec. 31, 2025 —
      TissueCypher Barrett's Esophagus test reports delivered in 2025 39,014 Twelve Months Ended Dec. 31, 2025 —

      Figures exactly as the company stated them in writing · click a metric with a to chart its history · period links open the stating document · "filing" marks figures stated in the 10-K/10-Q · YoY needs an exactly comparable prior-year period

      Versus peers

      Diagnostics & Research — same industry group
      Open screener →
      Company Mkt cap YTD Rev growth Y/Y P/E Short % shares
      CSTL
      Castle Biosciences Inc
      this stock
      		$945.81M -15.3% +3.7% — 5.1%
      TMO
      Thermo Fisher Scientific Inc.
      		 $231.21B +8.3% +14.5% 33.6 1.3%
      DHR
      Danaher Corp /De/
      		 $147.41B -5.7% +8.5% 37.2 1.7%
      NTRA
      Natera, Inc.
      		 $46.86B +41.8% -2.8% — 3.0%
      IDXX
      Idexx Laboratories Inc /De
      		 $44.29B -19.3% +10.4% 39.5 2.4%

      Peers by industry group · P/E from as-reported trailing EPS · short % is of shares outstanding

      At a glance

      key data from every section
      Ownership
      Institutional Holders Reducing
      Holders
      176
      % held
      89.4%
      Net QoQ
      -382.9K sh
      Top holder
      BlackRock, Inc.
      Held Float
      View
      Held by Funds
      Fund positions
      244
      View
      Short & Settlement
      Short Interest Rising
      Shares short
      1.6M
      Days to cover
      3.2d
      Change
      +140.2K sh
      View
      Short Volume
      Short vol %
      55%
      As of
      Aug 20, 2026
      Short Total
      View
      Fails to Deliver
      FTD shares
      172
      Value
      $4.2K
      As of
      Jul 22, 2026
      View
      Off-Exchange
      Off-exchange %
      37.1%
      Week of
      Jul 13, 2026
      Off-exch Lit
      View
      Smart Money
      Insider Trades Net selling
      Net (90d)
      -$741.5K
      Buyers / Sellers
      0 / 1
      Buyers Sellers
      View
      Congressional Trades Sell
      Member
      Josh Gottheimer
      Amount
      $1.0K–$15.0K
      Traded
      Mar 15, 2022
      View
      Financials
      Financials
      Revenue (FY)
      $344.2M
      Net income (FY)
      $-24.2M
      EPS diluted
      $-0.83
      View
      Filings
      SEC Filings
      Latest
      Investor Event Transcript
      Filed
      Aug 12, 2026
      This year
      11
      View
      Proposed Sales
      Value
      $741.5K
      Shares
      24.9K
      Filed
      Aug 14, 2026
      View
      Earnings & Events
      Earnings Calls Upcoming
      Next call
      Sep 15, 2026
      Last call
      Aug 12, 2026
      View
      Investor Relations
      Upcoming events
      1
      View

      Performance

      5D 20D 120D MTD YTD
      CSTL +7.8% +29.2% +11.4% +17.6% -15.4%
      SPY -2.0% +3.3% +11.2% +2.1% +11.8%
      vs SPY +9.8% +25.9% +0.2% +15.5% -27.2%
      Key facts CIK 1447362 CUSIP 14843C105 13F (30d) 161 filings 161 filers Visit website Investor relations

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