Castle Biosciences (CSTL) Options Chain
NASDAQ: CSTLHealth CareMedical SpecialitiesUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Jan 15, 2027
- Days to expiration
- 96
- Share price
- $34.42
- Put/call ratio (OI)
- 0.29
- Put/call ratio (volume)
- 0.65
- Expected move
- ±$10.89
- Open interest (C / P)
- 59 / 17
CSTL options summary
The CSTL options chain for the January 15, 2027 expiration lists 8 call and 6 put contracts, with 96 days until expiration. Open interest stands at 59 calls and 17 puts, a put/call ratio of 0.29, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $35.00 strike is 61.7%, which implies the market expects a move of about ±$10.89 (31.6%) in Castle Biosciences stock by expiration.
The most open interest sits at the $35.00 call (29 contracts) and the $15.00 put (4 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
CSTL options chain · January 15, 2027
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 21.80 | 29.00 | 33.20 | 2.50 | — | — | — | |||||
| 26.50 | 0.00 | 0.00 | 5.00 | — | — | — | |||||
| — | — | — | 12.50 | 0.00 | 0.95 | 0.45 | |||||
| — | — | — | 15.00 | 0.00 | 0.75 | 0.25 | |||||
| — | — | — | 17.50 | 0.00 | 2.40 | 1.20 | |||||
| — | — | — | 20.00 | 0.00 | 1.75 | 0.40 | |||||
| 5.90 | 11.30 | 13.80 | 22.50 | — | — | — | |||||
| 9.08 | 8.10 | 12.10 | 25.00 | 0.00 | 2.75 | 1.05 | |||||
| 5.70 | 0.00 | 0.00 | 30.00 | 0.20 | 4.40 | 1.55 | |||||
| 4.11 | 2.20 | 6.00 | 35.00 | — | — | — | |||||
| 1.80 | 0.15 | 4.20 | 40.00 | — | — | — | |||||
| 1.40 | 0.00 | 2.85 | 45.00 | — | — | — | |||||
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 January 15, 2027 expiration, the CSTL put/call ratio based on open interest is 0.29 (17 puts vs 59 calls), and 0.65 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 January 15, 2027 is about 61.7%, 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.