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CSTL

Castle Biosciences, Inc.Close $20.03EOD only
Max Pain
$20.00
Next expiry Jun 18, 2026
Expected Move
±$2.88
14.3% from close
Price Gap
-0.03
Distance to max pain
IV Rank
5
Low premium
P/C OI
0.24
Slightly call-heavy
Consensus
—
No reports available
Published snapshot: May 20, 2026 close
End-of-day snapshot

This page reflects CSTL options positioning from the latest published market-close snapshot. Intraday price and contract changes are not displayed.

Published Snapshot
May 20, 2026 close
Historical Volatility — CSTL
Data as of market close May 20, 2026

Volatility regime context for premium pricing decisions. CTA pressure stays medium unless IV percentile, IV-vs-HV spread, regime label, and rich/cheap verdict are all available above the fold.

CSTL Volatility
Regime framing first, then historical context
IV Current
100.4%
Current implied level
IV Percentile
26%
Position in selected lookback window
IV vs HV20
-0.5 pts
Near parity
Regime
Mid-range
IV is sitting in the middle of its recent range.
HV 20d
100.9%
Realized baseline
IV vs HV history
Keep the chart dominant and use period toggles for context windows
248/250 points passed volatility sanity checks
Signals
Near ParityRegime Mid-range
Quick Stats
IV Percentile26%
IV vs HV20-0.5 pts
RegimeMid-range
HV 20d100.9%
Consensus

Reports are not available for this symbol yet. Use signals and levels while coverage is pending.

View Report Status→
Latest ratios
P/C Volume0.45
P/C OI0.24
Excluded 2 points with implausible volatility units.
How to Read Volatility Context
This page compares realized movement with options pricing so you can judge whether premium looks rich or cheap.
What the comparison means

Historical volatility shows what the stock has actually done, while implied volatility shows what options are currently charging for future movement.

How traders use it

When IV sits above realized movement, premium sellers often pay attention. When realized movement catches up or exceeds IV, buyers get a stronger case.

What can trap you

Expensive options can still get more expensive into catalysts, and cheap-looking options can stay cheap when realized movement dries up.

Rich or cheap is a pricing read, not a directional signal by itself.