SPX · PUTS · OCT 22Settled
Open interest in SPX puts expiring Oct 22 rose 126,840 at the Oct 21 settlement
As of . Source: Cboe settlement open interest archive.
On the page at squawkflow.com/options-flow/2026-10-21/spx-puts-oct-22-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other SPX snapshots from Oct 21, 2026.
106,128 to 232,968 contracts between the Oct 20 and Oct 21 settlements, 120% of the prior figure.
Before106,128
After232,968
Evidence
The numbers behind this snapshot, Oct 21, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.| Measure | Value |
|---|
| Open interest, earlier settlement | 106,128 |
|---|
| Open interest, later settlement | 232,968 |
|---|
| Change (contracts) | +126,840 |
|---|
| Change as a share of the earlier figure | 120% |
|---|
| Earlier settlement | Oct 20, 2026 |
|---|
| Later settlement | Oct 21, 2026 |
|---|
| Days to expiry | 1 |
|---|
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: 126,840; Change as a share of the earlier figure: 1.1952
- Contracts traded behind each figure
- Open interest changed: 180
- Baseline
- median absolute open interest change share, contracts within a week: 0.1865
- 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.
SPXCOCT 22Open interest change
55,889 to 142,963 contracts between the Oct 20 and Oct 21 settlements, 156% of the prior figure.