Castle Biosciences (CSTL) Options Chain
NASDAQ: CSTLHealth CareMedical SpecialitiesUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Apr 16, 2027
- Days to expiration
- 187
- Share price
- $34.42
- Put/call ratio (OI)
- 12.00
- Put/call ratio (volume)
- 5.00
- Expected move
- ±$13.87
- Open interest (C / P)
- 2 / 24
CSTL options summary
The CSTL options chain for the April 16, 2027 expiration lists 1 call and 5 put contracts, with 187 days until expiration. Open interest stands at 2 calls and 24 puts, a put/call ratio of 12.00, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $35.00 strike is 56.3%, which implies the market expects a move of about ±$13.87 (40.3%) in Castle Biosciences stock by expiration.
The most open interest sits at the $25.00 call (2 contracts) and the $25.00 put (8 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
CSTL options chain · April 16, 2027
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| — | — | — | 20.00 | 0.00 | 2.70 | 0.75 | |||||
| — | — | — | 22.50 | 0.00 | 3.10 | 1.05 | |||||
| 10.18 | 9.40 | 13.30 | 25.00 | 0.00 | 3.80 | 1.25 | |||||
| — | — | — | 30.00 | 1.60 | 5.00 | 2.80 | |||||
| — | — | — | 35.00 | 4.20 | 7.50 | 4.80 | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the CSTL put/call ratio?
For the April 16, 2027 expiration, the CSTL put/call ratio based on open interest is 12.00 (24 puts vs 2 calls), and 5.00 based on today's volume. A ratio above 1 means more puts than calls.
What is CSTL's implied volatility?
At-the-money implied volatility for CSTL options expiring April 16, 2027 is about 56.3%, an annualized estimate of how much the market expects Castle Biosciences stock to move.
How many CSTL option expiration dates are there?
CSTL has 4 listed expiration dates, from Oct 16, 2026 to Apr 16, 2027.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.