SPYPOCT 12Open interest change
Open interest in SPY puts expiring Oct 12 rose 239,444 at the Oct 9 settlement
148,297 to 387,741 contracts between the Oct 8 and Oct 9 settlements, 161% of the prior figure.
SPY · PUTS · NOV 27Settled
Open interest in SPY puts expiring Nov 27 rose 2,937 at the Oct 9 settlement
As of . Source: Cboe settlement open interest archive.
1,061 to 3,998 contracts between the Oct 8 and Oct 9 settlements, 277% of the prior figure.
Evidence
| Measure | Value |
|---|---|
| Open interest, earlier settlement | 1,061 |
| Open interest, later settlement | 3,998 |
| Change (contracts) | +2,937 |
| Change as a share of the earlier figure | 277% |
| Earlier settlement | Oct 8, 2026 |
| Later settlement | Oct 9, 2026 |
| Days to expiry | 49 |
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: 2,937; Change as a share of the earlier figure: 2.7681
- Contracts traded behind each figure
- Open interest changed: 80
- Baseline
- median absolute open interest change share, contracts 1 to 3 months out: 0.0231
- 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 9, 2026
All SPY snapshots on the hub- SPYCOCT 23Put/call by expiry
SPY calls outnumbered puts 2.8 to 1 in contracts expiring Oct 23 (2 weeks out)
20,635 call and 7,246 put contracts by 10:22 ET on Oct 9, 2026. Est. premium $6.1M calls, $3.9M puts. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYP776OCT 9Volume vs open interest
SPY 776 puts expiring Oct 9 (same day) traded 7.6x their open interest
SPY puts expiring that date in the strikes we track traded 0.9x their open interest, by 09:47 ET on Oct 9, 2026. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYOCT 9Same-day share
Same-day contracts accounted for 67% of tracked SPY option volume by 09:32 ET
89,841 of 134,671 tracked contracts on Oct 9, 2026, puts 41,972 and calls 47,869. Tracked: up to 40 strikes around the money across 33 expirations.