SPYCOCT 26Open interest change
Open interest in SPY calls expiring Oct 26 (2 weeks out) rose 3,865 at the Oct 13 settlement
2,176 to 6,041 contracts between the Oct 12 and Oct 13 settlements, 178% of the prior figure.
SPY · PUTS · OCT 14Settled
Open interest in SPY puts expiring Oct 14 rose 212,127 at the Oct 13 settlement
As of . Source: Cboe settlement open interest archive.
178,470 to 390,597 contracts between the Oct 12 and Oct 13 settlements, 119% of the prior figure.
Evidence
| Measure | Value |
|---|---|
| Open interest, earlier settlement | 178,470 |
| Open interest, later settlement | 390,597 |
| Change (contracts) | +212,127 |
| Change as a share of the earlier figure | 119% |
| Earlier settlement | Oct 12, 2026 |
| Later settlement | Oct 13, 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: 212,127; Change as a share of the earlier figure: 1.1886
- Contracts traded behind each figure
- Open interest changed: 72
- Baseline
- median absolute open interest change share, contracts within a week: 0.3893
- 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 SPY snapshots, Oct 13, 2026
All SPY snapshots on the hub- SPYC778OCT 13Volume vs open interest
SPY 778 calls expiring Oct 13 (same day) traded 11.9x their open interest
SPY calls expiring that date in the strikes we track traded 3.9x their open interest, by 10:12 ET on Oct 13, 2026. Tracked: up to 40 strikes around the money across 34 expirations.
- SPYPOCT 30Put/call by expiry
SPY puts expiring Oct 30 (2 weeks out) traded 4.1x the calls on that date
5,332 put and 1,285 call contracts by 09:42 ET on Oct 13, 2026. Est. premium $2.2M puts, $791K calls. Tracked: up to 40 strikes around the money across 34 expirations.
- SPYPOCT 16Put/call by expiry
SPY puts expiring Oct 16 traded 3.0x the calls on that date
5,675 put and 1,880 call contracts by 09:32 ET on Oct 13, 2026. Est. premium $1.1M puts, $413K calls. Tracked: up to 40 strikes around the money across 34 expirations.
- SPYOCT 13Same-day share
Same-day contracts accounted for 70% of tracked SPY option volume by 09:32 ET
64,688 of 92,332 tracked contracts on Oct 13, 2026, puts 36,583 and calls 28,105. Tracked: up to 40 strikes around the money across 34 expirations.