SPX · PUTS · OCT 26Settled
Open interest in SPX puts expiring Oct 26 rose 158,746 at the Oct 23 settlement
As of . Source: settlement open interest archive.
On the page at squawkflow.com/options-flow/2026-10-23/spx-puts-oct-26-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other SPX snapshots from Oct 23, 2026.
128,041 to 286,787 contracts between the Oct 22 and Oct 23 settlements, 124% of the prior figure.
Before128,041
After286,787
Evidence
The numbers behind this snapshot, Oct 23, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.| Measure | Value |
|---|
| Open interest, earlier settlement | 128,041 |
|---|
| Open interest, later settlement | 286,787 |
|---|
| Change (contracts) | +158,746 |
|---|
| Change as a share of the earlier figure | 124% |
|---|
| Earlier settlement | Oct 22, 2026 |
|---|
| Later settlement | Oct 23, 2026 |
|---|
| Days to expiry | 3 |
|---|
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: 158,746; Change as a share of the earlier figure: 1.2398
- Contracts traded behind each figure
- Open interest changed: 185
- Baseline
- median absolute open interest change share, contracts within a week: 0.1861
- 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 26Open interest change
53,563 to 110,150 contracts between the Oct 22 and Oct 23 settlements, 106% of the prior figure.