Delayed CBOE data, snapshot 2026-08-18. Spot $271.
Put/Call (OI)
0.77
29k P / 38k C
Put/Call (Volume)
0.56
363 P / 646 C today
30d ATM IV
34%
annualized implied move
Call wall
$280
3k contracts
Put wall
$240
2k contracts
Tail hedging
3.7×
deep-OTM puts vs calls
All expiries combined. Amber lines mark the call and put walls; the dashed line is spot.
At-the-money implied volatility per expiry.
IV by strike — expiry 2026-09-18. A steep left side = expensive downside protection.
Daily ATM IV (~30 DTE bucket) collected since March 2026. Rising IV into an event = the market bracing; collapsing IV after = the crush.
| Expiry | Call OI | Put OI | P/C | Volume today |
|---|---|---|---|---|
| 2026-08-21 | 4k | 2k | 0.59 | 296 |
| 2026-09-18 | 8k | 7k | 0.88 | 357 |
| 2026-10-16 | 3k | 2k | 0.71 | 158 |
| 2026-12-18 | 3k | 3k | 0.80 | 32 |
| 2027-01-15 | 11k | 9k | 0.75 | 71 |
| 2027-03-19 | 2k | 769 | 0.39 | 32 |
| 2027-06-17 | 3k | 3k | 1.15 | 39 |
| 2028-01-21 | 5k | 3k | 0.69 | 24 |
Source: CBOE delayed quotes, refreshed daily after US market close. Open interest is exchange-reported and lags one session. Research, not investment advice.