CSTL
Castle Biosciences Inc
NASDAQ: CSTL · HEALTHCARE · DIAGNOSTICS & RESEARCH
$35.81
+1.76% today
Updated 2026-09-25
Market cap
$1.06B
P/E ratio
—
P/S ratio
2.98x
EPS (TTM)
$-0.64
Dividend yield
—
52W range
$18 – $44
Volume
0.4M
WallStSmart proprietary scores
34
out of 100
Grade: F
Strong Sell
Investment rating
6.7
Growth
B8.5
Quality
A2.0
Profitability
F6.7
Valuation
B3/9
Piotroski F-Score
Weak
3.1
Altman Z-Score
Safe zone
—
Industry rank
—
View all highly rated stocks (75+) →261 stocks currently score above 75
Price targets
Analyst target
$44.00
+22.87%
12-Month target
—
—
Intrinsic (DCF)
$77.31
Margin of safety
+58.17%
0 Strong Buy9 Buy0 Hold0 Sell0 Strong Sell
Price chart
Stock snapshot
Strengths
+ Altman Z 3.11 — safe zone
+ Free cash flow $6.55M — positive
+ Revenue growth 20.10% QoQ
+ 58.17% below intrinsic value
+ Debt/equity 0.08x — low leverage
Risks
- Piotroski 3/9 — weak financial health
- Thin margins at -5.43%
Key financials
Revenue Net Income Free Cash Flow
| Metric | 2022 | 2023 | 2024 | 2025 | TTM |
|---|---|---|---|---|---|
| Revenue | $137.04M | $219.79M | $332.07M | $344.23M | $357.28M |
| Net income | $-67.14M | $-57.47M | $18.25M | $-24.16M | $-2.06M |
| EPS | — | — | — | — | $-0.64 |
| Free cash flow | $-47.29M | $-19.25M | $36.54M | $28.33M | $6.55M |
| Profit margin | -48.99% | -26.15% | 5.49% | -7.02% | -5.43% |
Recent insider activity
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| 2026-09-01 | OELSCHLAGER, KRISTEN M | Sale | 4,152 | — |
| 2026-09-01 | OELSCHLAGER, KRISTEN M | Buy | 4,152 | $3.38 |
| 2026-09-01 | OELSCHLAGER, KRISTEN M | Sale | 3,952 | $33.36 |
Peer comparison
Smart narrative
Castle Biosciences Inc trades at $35.81. Our Smart Value Score of 34/100 indicates the stock is weak. The company scores 3/9 on the Piotroski F-Score. With an Altman Z-Score of 3.11, it sits in the safe zone. TTM revenue stands at $357.28M. with profit margins at -5.43%. Our DCF model estimates intrinsic value at $77.31.
Frequently asked questions
What is Castle Biosciences Inc's stock price?
Castle Biosciences Inc (CSTL) trades at $35.81, on a P/S of 3.0x. Those multiples show what the market is paying for each dollar of earnings and sales, which is the real starting point for judging whether the price is reasonable.
Is Castle Biosciences Inc overvalued?
Castle Biosciences Inc carries a Smart Value Score of 34/100 (Grade F), which we rate Strong Sell. That score blends growth, quality, and valuation into one read. Our DCF puts intrinsic value at $77.31 versus the $35.81 price, a 58.2% margin of safety on a cash flow basis.
What is the price target of Castle Biosciences Inc (CSTL)?
The 12-month analyst consensus target is $44.00, about 22.9% above the current $35.81. A consensus target is the average of Wall Street's 12-month forecasts, so it works as a sentiment gauge rather than a guarantee, and it resets with every earnings cycle.
What is the intrinsic value of Castle Biosciences Inc (CSTL)?
Our DCF model estimates intrinsic value at $77.31, a +58.2% margin of safety versus today's $35.81. Intrinsic value is what the projected cash flows are worth today. A positive reading means the price sits below that estimate, leaving a cushion if growth holds.
What is Castle Biosciences Inc's revenue?
Castle Biosciences Inc's trailing twelve-month revenue is $357.28M. Revenue scale anchors the valuation multiples and shows whether growth is reaching the top line, so it is best read alongside margin and growth trends to see if that revenue is getting more profitable over time.
Altman Z-Score?
Castle Biosciences Inc's Altman Z-Score is 3.11, which places it in the safe zone. The Altman Z-Score gauges bankruptcy risk from profitability, leverage, and asset efficiency, and a higher reading points to lower financial distress risk.
Company info
SectorHEALTHCARE
IndustryDIAGNOSTICS & RESEARCH
CountryUSA
ExchangeNASDAQ
CurrencyUSD
Quick metrics
P/S ratio2.98x
ROE-4.13%
Beta1.00
50D MA$30.31
200D MA$29.23
Shares out0.03B
Float0.03B
Short ratio—
Avg volume0.4M
Performance
1 week-1.78%
1 month+4.12%
3 months+57.55%
YTD-10.41%
1 year+47.92%
3 years—
5 years—