Value
9.0/10data confidence 33%| Component | Sub-score |
|---|---|
| P/S | 8.9 |
| Analyst target | 9.0 |
- ▸Attractively valued
CSTL · Why this verdict
Why Castle Biosciences (CSTL) is rated SELL
Updated
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VerdictSELL
Overall score5.1/10
ConfidenceMEDIUM
MacroNEUTRAL
Thesis pillars
| Pillar | Expectation | Trend |
|---|---|---|
Castle Biosciences carries an 81% analyst-implied upside per light coverage, and the engine's own risk/reward framework shows 57.2% upside versus 15.0% downside. Sentiment breakdown | Price appreciates toward the analyst target, narrowing the upside gap to under 40% within 12 months. | →Stable |
| CounterLight analyst coverage, described as a dampened signal, means the 81% upside estimate rests on a thin sample of price targets and could be unreliable. | ||
Castle Biosciences has beaten consensus EPS estimates in 3 of its last reported quarters, averaging a 73.7% surprise. Earnings | The company beats consensus again at its next print, extending the beat streak. | →Stable |
| CounterThe company's quality score of 3.1 sits below the engine's 4.0 floor, and a Rule of 40 score of -1 signals the beats are not yet translating into a durable growth-plus-margin profile. | ||
Although the stock sits below its 200-day moving average, the MA itself is still rising (+0.1%/30d), which the engine classifies as a pullback within an uptrend rather than confirmed technical weakness. Momentum breakdown | Price reclaims the 200-day moving average within 2 quarters, confirming the uptrend read was correct. | →Stable |
| CounterAn RSI of 73 flags an overbought bear-rally condition, suggesting the recent bounce could fail rather than confirm a genuine uptrend resumption. | ||
Insiders have sold $1.12 million in shares (0.153% of market cap), a notable-materiality signal the engine flags as a moderate insider-selling risk. Insider breakdown | Insider selling activity moderates to negligible levels ($0 net) over the next 90-day window. | →Stable |
| CounterSustained insider selling around this materiality threshold, paired with a sub-floor quality score, could reflect informed skepticism about the durability of recent earnings beats. | ||
Castle Biosciences' quality score of 3.1 sits below the engine's 4.0 minimum floor, triggering the exit recommendation despite a strong upside case and beat streak. Bear case | Quality score rises above 4.0 within 2 quarters if fundamentals genuinely strengthen enough to reverse the exit signal. | →Stable |
| CounterA Rule of 40 score of -1 and 'no competitive moat' both point to structural quality weakness rather than a temporary shortfall likely to reverse quickly. | ||
Castle Biosciences carries an 81% analyst-implied upside per light coverage, and the engine's own risk/reward framework shows 57.2% upside versus 15.0% downside.
→StableSentiment breakdown
- Expectation
- Price appreciates toward the analyst target, narrowing the upside gap to under 40% within 12 months.
CounterLight analyst coverage, described as a dampened signal, means the 81% upside estimate rests on a thin sample of price targets and could be unreliable.
Castle Biosciences has beaten consensus EPS estimates in 3 of its last reported quarters, averaging a 73.7% surprise.
→StableEarnings
- Expectation
- The company beats consensus again at its next print, extending the beat streak.
CounterThe company's quality score of 3.1 sits below the engine's 4.0 floor, and a Rule of 40 score of -1 signals the beats are not yet translating into a durable growth-plus-margin profile.
Although the stock sits below its 200-day moving average, the MA itself is still rising (+0.1%/30d), which the engine classifies as a pullback within an uptrend rather than confirmed technical weakness.
→StableMomentum breakdown
- Expectation
- Price reclaims the 200-day moving average within 2 quarters, confirming the uptrend read was correct.
CounterAn RSI of 73 flags an overbought bear-rally condition, suggesting the recent bounce could fail rather than confirm a genuine uptrend resumption.
Insiders have sold $1.12 million in shares (0.153% of market cap), a notable-materiality signal the engine flags as a moderate insider-selling risk.
→StableInsider breakdown
- Expectation
- Insider selling activity moderates to negligible levels ($0 net) over the next 90-day window.
CounterSustained insider selling around this materiality threshold, paired with a sub-floor quality score, could reflect informed skepticism about the durability of recent earnings beats.
Castle Biosciences' quality score of 3.1 sits below the engine's 4.0 minimum floor, triggering the exit recommendation despite a strong upside case and beat streak.
→StableBear case
- Expectation
- Quality score rises above 4.0 within 2 quarters if fundamentals genuinely strengthen enough to reverse the exit signal.
CounterA Rule of 40 score of -1 and 'no competitive moat' both point to structural quality weakness rather than a temporary shortfall likely to reverse quickly.
TrendMatrix Research · core thesis
Engine thesis — one sentence
Castle Biosciences shows a perfect recent earnings-beat streak and steep analyst-implied upside, with technicals reading as a pullback rather than a breakdown, but a sub-floor quality score, a failing Rule of 40 metric, and notable insider selling keep the engine's stance at exit.
Falsifiable statement — pillar-level invalidators below. Engine-derived; not personalized advice.
Per-dimension breakdown
Quality
3.5/10data confidence 100%| Component | Sub-score |
|---|---|
| ROE | 0.0 |
| ROA | 0.0 |
| Gross margin | 10.0 |
| Op margin | 0.0 |
| Net margin | 0.0 |
| Current ratio | 6.3 |
| FCF quality | 3.8 |
| Moat | 5.5 |
| Rule of 40 | 3.0 |
| Piotroski F | 6.7 |
- ▸FCF-positive despite GAAP loss (FCF margin 4%, FCF yield 1.8%)
- ▸Rule of 40: -1 (fail)
Growth
1.3/10data confidence 33%| Component | Sub-score |
|---|---|
| Rev growth | 1.3 |
- ▸Declining revenue: -5%
Momentum
5.1/10data confidence 100%| Component | Sub-score |
|---|---|
| RSI | 2.8 |
| MACD | 10.0 |
| OBV | 1.0 |
| MA position | 7.2 |
| Volume | 4.3 |
- ▸Overbought bear rally (RSI 73)
- ▸Volume distribution (falling OBV)
- ▸Below 200-MA but MA still rising (+0.1%/30d) — pullback in uptrend, not confirmed weakness
Sentiment
7.7/10data confidence 100%| Component | Sub-score |
|---|---|
| Analyst rating | 8.0 |
| Price target | 9.9 |
| erm sentiment | 4.7 |
- ▸Light analyst coverage (9.0) — signal dampened
- ▸Analyst upside: 84%
Insider
5.0/10data confidence 50%Peer rank
5.1/10data confidence 80%| Component | Sub-score |
|---|---|
| value rank | 7.5 |
| quality rank | 3.5 |
| growth rank | 0.9 |
- ▸Conservative debt levels
Technical
3.1/10data confidence 100%| Component | Sub-score |
|---|---|
| bollinger | 3.0 |
| support resistance | 2.6 |
| 52w position | 0.7 |
| gap | 6.0 |
Risk (lower is worse)
5.1/10data confidence 100%| Component | Sub-score |
|---|---|
| short interest | 7.5 |
| days to cover | 6.4 |
| volatility | 2.7 |
| put call | 0.0 |
| implied vol | 0.5 |
| max pain risk | 7.0 |
| beta | 7.0 |
| debt equity | 9.7 |
- ▸Elevated put/call: 2.20
- ▸High IV: 77%
Catalyst
7.5/10data confidence 100%| Component | Sub-score |
|---|---|
| erm | 5.0 |
| earnings history | 10.0 |
| earnings timing | 5.0 |
| surprise avg | 10.0 |
- ▸Strong earnings: 3B/0M
How the verdict was assembled
Engine trigger
Quality below minimum threshold.
Engine technical detail
verdict_path:
L1:HARD_BLOCKPassed (8)
- MOMENTUM:5.1>=4.5
- ASYMMETRY:4.0>=1.5
- INSIDER:OK
- 8K:CLEAN
- NEWS_EVENTS:NONE_RECENT
- EARNINGS_PROXIMITY:27d clear
- SEMI_CYCLE_PEAK:CLEAR
- MATERIALS_CYCLE_PEAK:CLEAR
Failed (0)
none
Warning (1)
- MOMENTUM:5.1<5.5 (soft — BUY_NOW allowed but watch)
Reward-to-Risk
4.02
Upside
+60.3%
Downside
15.0%
Sizing output
AVOID
Setup— — No clear chart pattern; technical signals are mixed
EdgeCatalyst-Driven — Earnings in 27d with 3/4 beat streak
SuitabilitySpeculative — Drawdown -47% (>40% off 52w high)
Investment implication
The L1 gate blocked the positive-verdict path: a hard-floor threshold was breached, so dimensional pillars — including Value at 9.0 could not lift the engine output above the verdict floor.
The strongest dimensions are Value at 9.0, Sentiment at 7.7, and Catalyst at 7.5; the weakest are Growth at 1.3, Technical at 3.1, and Quality at 3.5. The V9 engine cleared all gates with 1 warning, producing an asymmetric reward-to-risk of 4.02 and an engine sizing output of AVOID.
What would invalidate the thesis
Falsifying conditions — when triggered, the corresponding pillar's thesis is invalidated.
- P1Analyst Upside Valuation
Trip ifAnalyst-implied upside stays above 70% for 2 more quarterly refreshes without price appreciation.
- P2Earnings Beat Streak
Trip ifCastle Biosciences misses consensus EPS estimates by more than 10% at its next earnings report, breaking the current beat streak.
- P3Momentum Pullback Not Breakdown
Trip ifThe 200-day moving average slope falls below 0% over the next 30 days, or price fails to reclaim the 200-day moving average within 2 quarters.
- P4Insider Selling Risk
Trip ifNet insider selling value exceeds $2 million (0.3% of market cap) in the next 90-day window.
- P5Quality Floor Exit Signal
Trip ifThe quality score stays below 3.5 at the next quarterly refresh, confirming the exit signal remains valid.