Castle Biosciences Inc. (CSTL)
NASDAQ: CSTL
· Real-Time Price · USD
21.42
-1.33 (-5.85%)
At close: Sep 12, 2025, 3:59 PM
21.75
1.54%
After-hours: Sep 12, 2025, 05:17 PM EDT
CSTL Gamma Exposure By Expiry
The total Gamma Exposure (GEX) for CSTL across all expirations is 2,485.72 shares per 1% move, with 2,731.93 from calls and 246.21 from puts. The put-call GEX ratio of 0.09 shows call-heavy positioning, potentially creating volatility as market makers hedge by selling into strength and buying weakness.
CSTL GEX Table
| Expiry Date | Call GEX | Put GEX | Net GEX | P/C GEX |
|---|---|---|---|---|
| Sep 19, 25 | 908.4 | -78.25 | 830.15 | 0.09 |
| Oct 17, 25 | 1,302.34 | -145.67 | 1,156.67 | 0.11 |
| Dec 19, 25 | 0 | 0 | 0 | n/a |
| Jan 16, 26 | 101.56 | -16.49 | 85.07 | 0.16 |
| Apr 17, 26 | 419.63 | -5.8 | 413.83 | 0.01 |