Castle Biosciences Inc. (CSTL)
NASDAQ: CSTL
· Real-Time Price · USD
20.55
0.46 (2.29%)
At close: Aug 18, 2025, 3:59 PM
20.56
0.05%
After-hours: Aug 18, 2025, 05:31 PM EDT
CSTL Gamma Exposure By Expiry
The total Gamma Exposure (GEX) for CSTL across all expirations is 549.32 shares per 1% move, with 794.97 from calls and 245.65 from puts. The put-call GEX ratio of 0.31 shows call-heavy positioning, potentially creating volatility as market makers hedge by selling into strength and buying weakness. The highest gamma concentration is at the Oct 17, 25 expiration with 569.3 net GEX, which may act as a magnet point for price action. Near-term exposure for Sep 19, 25 suggests possible volatility from negative gamma effects.
CSTL GEX Table
| Expiry Date | Call GEX | Put GEX | Net GEX | P/C GEX |
|---|---|---|---|---|
| Sep 19, 25 | 16.62 | -73.16 | -56.54 | 4.40 |
| Oct 17, 25 | 726.44 | -157.14 | 569.3 | 0.22 |
| Dec 19, 25 | 0 | 0 | 0 | n/a |
| Jan 16, 26 | 51.91 | -15.35 | 36.56 | 0.30 |
| Apr 17, 26 | 0 | 0 | 0 | n/a |