IWMCOCT 26Open interest change
Open interest in IWM calls expiring Oct 26 rose 16,300 at the Oct 22 settlement
26,846 to 43,146 contracts between the Oct 21 and Oct 22 settlements, 61% of the prior figure.
IWM · PUTS · OCT 29Settled
Open interest in IWM puts expiring Oct 29 (1 week out) rose 4,855 at the Oct 22 settlement
As of . Source: Cboe settlement open interest archive.
On the page at squawkflow.com/options-flow/2026-10-22/iwm-puts-oct-29-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other IWM snapshots from Oct 22, 2026.
6,517 to 11,372 contracts between the Oct 21 and Oct 22 settlements, 74% of the prior figure.
Evidence
| Measure | Value |
|---|---|
| Open interest, earlier settlement | 6,517 |
| Open interest, later settlement | 11,372 |
| Change (contracts) | +4,855 |
| Change as a share of the earlier figure | 75% |
| Earlier settlement | Oct 21, 2026 |
| Later settlement | Oct 22, 2026 |
| Days to expiry | 7 |
Why it fired
- Rule
- |change| >= 10000 or (>= 2000 and >= 50% of prior), and |change share| >= 2.0 x bucket median; prior OI >= 1000
- Values that cleared it
- Change: 4,855; Change as a share of the earlier figure: 0.745
- Contracts traded behind each figure
- Open interest changed: 31
- Baseline
- median absolute open interest change share, contracts 1 to 3 weeks out: 0.1579
- Baseline window
- last 20 sessions
- Baseline n
- 20
- Claim level
- 0, a reported fact
What happened next
This snapshot is itself a settlement figure, so it has no follow-up of its own.
More IWM snapshots, Oct 22, 2026
All IWM snapshots on the hub- IWMCNOV 6Put/call by expiry
IWM calls outnumbered puts 1.6 to 1 expiring Nov 6 (2 weeks out), vs a 0.6 median
The median is IWM's call/put volume ratio for contracts 1 to 3 weeks out over the last 10 sessions. 14,088 call and 8,919 put contracts by 13:36 ET on Oct 22, 2026. Tracked: up to 40 strikes around the money across 34 expirations.
- IWMPOCT 26Put/call by expiry
IWM puts expiring Oct 26 traded 1.5x the calls, vs a 0.8x median
The median is IWM's put/call volume ratio for contracts within a week over the last 10 sessions. 28,007 put and 18,179 call contracts by 13:17 ET on Oct 22, 2026. Tracked: up to 40 strikes around the money across 34 expirations.
- IWMPOCT 28Put/call by expiry
IWM puts expiring Oct 28 traded 2.4x the calls, vs a 0.8x median
The median is IWM's put/call volume ratio for contracts within a week over the last 10 sessions. 6,968 put and 2,855 call contracts by 11:56 ET on Oct 22, 2026. Tracked: up to 40 strikes around the money across 34 expirations.
- IWMPDEC 18Put/call by expiry
IWM puts expiring Dec 18 traded 5.5x the calls, vs a 2.6x median
The median is IWM's put/call volume ratio for contracts 1 to 3 months out over the last 10 sessions. 4,309 put and 779 call contracts by 10:11 ET on Oct 22, 2026. Tracked: up to 40 strikes around the money across 34 expirations.
- IWMOCT 22Same-day share
Same-day contracts accounted for 60% of tracked IWM option volume by 10:00 ET
192,357 of 318,574 tracked contracts on Oct 22, 2026, puts 79,802 and calls 112,555. Tracked: up to 40 strikes around the money across 34 expirations.