SPX · PUTS · OCT 13Settled
Open interest in SPX puts expiring Oct 13 rose 75,387 at the Oct 12 settlement
As of . Source: Cboe settlement open interest archive.
125,037 to 200,424 contracts between the Oct 9 and Oct 12 settlements, 60% of the prior figure.
Before125,037
After200,424
Evidence
The numbers behind this snapshot, Oct 12, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.| Measure | Value |
|---|
| Open interest, earlier settlement | 125,037 |
|---|
| Open interest, later settlement | 200,424 |
|---|
| Change (contracts) | +75,387 |
|---|
| Change as a share of the earlier figure | 60% |
|---|
| Earlier settlement | Oct 9, 2026 |
|---|
| Later settlement | Oct 12, 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: 75,387; Change as a share of the earlier figure: 0.6029
- Contracts traded behind each figure
- Open interest changed: 172
- Baseline
- median absolute open interest change share, contracts within a week: 0.2262
- 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 13Open interest change
60,098 to 107,126 contracts between the Oct 9 and Oct 12 settlements, 78% of the prior figure.