QualityDipStocks / Health Care · Medical Specialities
Castle Biosciences CSTL
Outside our quality screen, so we don’t track its dips. It’s 19% below its 52-week high.
Outside our quality screen, 5% over its Market Value. No fair value estimate for now: its free cash flow is negative.
Worth knowing
- Net cash = 23% of its market cap
From the data on this page, as of the last close. How we pick these
- Fair value est.
- n/a
- Market Value
- $33.21price +5%
- Off 52-wk high
- −19%
- Risk vs market
- Market-likebeta 0.99
52-week range 67% of the way from its 52-week low to its high
Price $34.94Market Value $33.21
4 bullish · 5 bearish See why
Repriced or dip?
Mixed signals
The price is 19% below its 52-week high (Jan 26), but the business held up: operating margin +1.2 pts, revenue +4.0%, net cash (cash minus debt) −1.9% of market cap since the high.
Some numbers held up (operating margin +1.2 pts, revenue +4.0%, net cash (cash minus debt) −1.9% of market cap since the high), others slipped (revenue growth rate −7.0 pts, free cash flow $25M → −$0M, turned negative, shares outstanding more shares, each owns less). The price is 19% below its 52-week high.
The price is 19% below its 52-week high, and the business changed too: revenue growth rate −7.0 pts, free cash flow $25M → −$0M, turned negative, shares outstanding more shares, each owns less.
Within 10% of its 52-week high, so there is no dip to judge yet.
The evidence 8 numbers, high vs now
- Revenue, last 12 months$344M → $357M (+4.0%)held up
- Revenue growth rate+10.1% → +3.2% a year (−7.0 pts)changed
- Free cash flow, 12 months$25M → −$0M, turned negativechanged
- Operating margin−10.2% → −9.0% (+1.2 pts)held up
- Shares outstanding+8.3% (more shares, each owns less)changed
- Net cash (cash minus debt)−1.9% of market cap since the highheld up
- Stock vs its sector (Health Care)stock −19%, sector median +12% since Jan 26changed
- Price fall vs business numbersprice −19%, revenue/EPS/FCF median +4% (shown, not scored)
Business numbers as reported at the high (12 months to Sep 30, 2025) vs the latest filing (12 months to Jun 30, 2026). Each measure is scored from −1 (business changed) to +1 (business intact) and weighted: revenue, earnings per share, free cash flow, operating margin, revenue growth rate, share count, net cash and the move vs its sector. 60 or more reads as a dip, 40 or less as a repricing. Analyst estimates are not in our data, so they are not used. How to read it
Data-based read, not advice.
Priced in
How much growth the market assumed at the 52-week high, the low and today (a reverse DCF).
At the high ($43.04, Jan 26) the price assumed about 24%/yr free-cash-flow growth; at the low ($18.15, May 13) about 42%. The last 3 years delivered 36%/yr (revenue).
Dashed line: what the last 3 years delivered, 36%/yr (revenue)
| High | Low | Now | |
|---|---|---|---|
| Price | $43.04Jan 26 | $18.15May 13 | $34.94 |
| Implied growth | +24% | +42% | n/a |
| P/FCF | 49.3× | 120.1× | — |
| EV/Sales | 2.8× | 0.9× | 2.4× |
What this means: the higher the implied growth, the more the price already counts on. If today's number sits well below what the business has delivered, the market expects less than its track record.
How it’s computed
Reverse DCF: the same 10-year free-cash-flow model as our fair value estimate (9.5% discount rate, growth for years 1–5 fading to 3% by year 10, 3% after), solved for the growth that makes it equal the market value at each price. For the high and the low we use only the filings that were public on that day, so nothing from a later report leaks back. Market value = that close × diluted shares. P/E = market value / 12-month net income; Price / FCF = market value / 12-month free cash flow; EV / Sales = (market value + debt − cash) / 12-month revenue. Hidden when the share count moved over 20% (split, merger), free cash flow is negative, or the company reports in another currency.
Valuation
What we estimate it's worth, and how it ranks on value vs every stock we cover.
Fair value estimate
No estimate for CSTL: negative free cash flow. We’d rather show nothing than a made-up number.
Risk vs market
How risk vs market is measured
One year of daily returns (Oct 31 to Nov 2, 252 sessions). Beta = how much CSTL moved for each 1% move in the S&P 500 (SPY); 1.0 moves with the market. Volatility is the yearly standard deviation of daily returns. Past behavior, not a forecast.
Moves about in line with the market, and its own price swings are 4.5× the S&P 500’s.
- Beta vs S&P 500
- 0.99
- Volatility
- 58% vs 13% SPY
- Correlation SPY
- 0.22
- Correlation QQQ
- 0.19
How it ranks
Where CSTL stands vs every one of the 2,467 stocks we cover that has the number. Longer bar = better.
Not in the top quarter on any of these 5 measures
- Free cash flow yield−0% · free cash flow vs market capLowest 20%of 1,690
- Dividends + buybacks yield0% · cash paid out or used to retire shares, vs market capLowest 1%of 2,227
- Revenue growth, last 12 months+3.2% · vs the 12 months beforeLowest 24%of 2,184
- Operating margin−9% · of sales kept as operating profitLowest 8%of 1,549
- Return on invested capital−12% · profit per dollar of capitalLowest 4%of 1,001
From SEC filings and our fair value estimate model. A ranking, not advice.
Valuation details
MV $33.21
Fundamentals
The business itself: sales, profits, cash and debt, from SEC filings.
Bull vs bear
Rule-based from the data on this page, strongest first. Not advice.
Top bullish points 4 of 5
ProfitabilityOperating margin widened to −12.4% in FY2025 from −30.9% in FY2023 (SEC filings).
GrowthSales compounded 36% a year from FY2022 to FY2025.
Balance sheetNet cash of $257M: cash and short-term investments exceed debt (Jun 30, 2026).
Balance sheetDebt / equity of 0.0×, below the 0.5× median for the 161 Health Care companies we cover.
Top bearish points 5 of 5
ValuationFree cash flow is negative (−$0M over the last 12 months), so there’s no cash-flow value under the price.
Balance sheetOperating income covers interest only -81.1× over the last 12 months.
GrowthSales growth slowed to 3% over the last 12 months, from 36% a year over the prior three fiscal years.
ProfitabilityLost $19M over the last 12 months (net income, SEC filings).
QualityDoesn’t pass our quality screen: no positive free cash flow; ROE under 12% and ROIC under 10%.
All fundamentals
FCF yield -0.0% · ROE -4% · Sales +3%
Valuation
- P/E
- n/aloss over the last 12 months
- Price / FCF
- n/anegative free cash flow
- FCF yield
- −0.0%
- EV / EBITDA
- n/anegative EBITDA
- Price / sales
- 3.08×
- Price / book
- 2.34×
- Market cap
- $1.1Blisted
- Enterprise value
- $843M
Growth
- Revenue, 12 months
- $357M
- Sales growth, 12 months
- +3.2%vs the 12 months before
- Sales growth, 3 yrs
- +35.9%/yrfrom FY2022
- Diluted EPS, 12 months
- −$0.64
- EPS growth, last FY
- n/afewer than two years of diluted EPS
- Net income, 12 months
- −$19M
- Net income growth
- n/anot reported in its SEC filings
Profitability
- Gross margin
- 77.3%
- Operating margin
- −9.0%
- Net margin
- −5.4%
- FCF margin
- −0.1%
- Return on equity
- −4%
- Return on invested capital
- −12%
Balance sheet
- Cash & short-term inv.
- $267M
- Total debt
- $10M
- Net cash
- $257M
- Debt / equity
- 0.02×
- Interest coverage
- -81.1×operating income / interest
Cash flow & returns
- Free cash flow, 12 months
- −$489,000
- FCF growth, 12 months
- n/anot reported in its SEC filings
- Dividend yield
- 0%
- Payout ratio
- n/anot reported in its SEC filings
- Buybacks, 12 months
- n/anot reported in its SEC filings
- Share count, 1 year
- +2.9%diluted shares vs a year ago
- Stock-based comp
- $45M
Trailing 12 months to Jun 30, 2026; balance sheet at Jun 30, 2026. From Castle Biosciences’s SEC filings. Sparklines show up to six fiscal years. n/a means we don’t hold that number, with the reason. How each is computed.
The business
FCF $-0.0B · Sales +20%
- Free cash flow, 12 months−$0.0B
- Free-cash-flow yield-0.0%
- Free-cash-flow margin−2%
- Gross margin77%
- Operating margin−3%
- Return on invested capital−4%
- Return on equity−4%
- Sales growth (latest quarter vs year-ago quarter)+20%
Chart & levels
Where the price is vs its key levels and trends.
Key levels
Every level vs today’s $34.94
- 52-wk lowlowest close, 1 year$18.15−48.1%
- Market Valueavg paid since Jul 30$33.21−5.0%
- PriceMon Nov 2 close$34.94you are here
- 52-wk highhighest close, 1 year$43.04+23.2%
Momentum & 52-week range
RSI 52 · 5 days +4.9%
Signals
Reversal signal setups, the public ledger and the next earnings date.
Setup & signals
No setup armed
No setup armed, so there’s no trigger or stop to track yet. Reversal signal rules only run on companies that pass our quality screen.
Next report
Nov 5
- DateThu Nov 5, after the close
- Consensus EPS($0.38)
- Year-ago EPS($0.02)
- QuarterSep/2026
From Nasdaq’s earnings calendar. A report resets Market Value.
CSTL is outside our quality screen
One text when a published rule fires on one of the 332 quality companies we track: the ticker, the price, the stop and a link to the numbers. Nothing else.
Voices & buzz
Who is talking about it, and how it compares with peers.
Who’s talking about it
Notable investors, executives, analysts and public figures on Castle Biosciences in the last 48 hours. Headlines as published, each linked. Their words, not ours.
No notable mentions in the last 48 hours. Checked Nov 3, 5:14 PM ET.
Compare with peers
Closest in size in Medical Specialities
Information only, not investment advice. Fair value estimates and talking points are rule-based model output from public data and can be wrong; stop levels are reference points, not orders. How every number is computed.