SPYCOCT 21Open interest change
Open interest in SPY calls expiring Oct 21 (2 weeks out) rose 5,673 at the Oct 8 settlement
1,859 to 7,532 contracts between the Oct 7 and Oct 8 settlements, 305% of the prior figure.
SPY · PUTS · OCT 21Settled
Open interest in SPY puts expiring Oct 21 (2 weeks out) rose 8,132 at the Oct 8 settlement
As of . Source: Cboe settlement open interest archive.
1,742 to 9,874 contracts between the Oct 7 and Oct 8 settlements, 467% of the prior figure.
Evidence
| Measure | Value |
|---|---|
| Open interest, earlier settlement | 1,742 |
| Open interest, later settlement | 9,874 |
| Change (contracts) | +8,132 |
| Change as a share of the earlier figure | 467% |
| Earlier settlement | Oct 7, 2026 |
| Later settlement | Oct 8, 2026 |
| Days to expiry | 13 |
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: 8,132; Change as a share of the earlier figure: 4.6682
- Contracts traded behind each figure
- Open interest changed: 65
- Baseline
- median absolute open interest change share, contracts 1 to 3 weeks out: 0.344
- Baseline window
- last 20 sessions
- Baseline n
- 19
- 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 8, 2026
All SPY snapshots on the hub- SPYC776OCT 9Volume vs open interest
SPY 776 calls expiring Oct 9 traded 27.6x their open interest
SPY calls expiring that date in the strikes we track traded 2.6x their open interest, by 15:57 ET on Oct 8, 2026. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYCOCT 14Put/call by expiry
SPY calls outnumbered puts 3.4 to 1 in contracts expiring Oct 14
134,667 call and 39,330 put contracts by 15:57 ET on Oct 8, 2026. Est. premium $14.7M calls, $12.9M puts. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYPJAN 15 '27Put/call by expiry
SPY puts expiring Jan 15, 2027 traded 2.7x the calls on that date
26,908 put and 10,129 call contracts by 15:57 ET on Oct 8, 2026. Est. premium $33.9M puts, $15.0M calls. Tracked: up to 40 strikes around the money across 33 expirations.