SPYCOCT 29Open interest change
Open interest in SPY calls expiring Oct 29 (1 week out) rose 8,347 at the Oct 19 settlement
10,136 to 18,483 contracts between the Oct 16 and Oct 19 settlements, 82% of the prior figure.
SPY · CALLS · NOV 20Settled
Open interest in SPY calls expiring Nov 20 rose 28,053 at the Oct 19 settlement
As of . Source: Cboe settlement open interest archive.
On the page at squawkflow.com/options-flow/2026-10-19/spy-calls-nov-20-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other SPY snapshots from Oct 19, 2026.
462,816 to 490,869 contracts between the Oct 16 and Oct 19 settlements, 6% of the prior figure.
Evidence
| Measure | Value |
|---|---|
| Open interest, earlier settlement | 462,816 |
| Open interest, later settlement | 490,869 |
| Change (contracts) | +28,053 |
| Change as a share of the earlier figure | 6% |
| Earlier settlement | Oct 16, 2026 |
| Later settlement | Oct 19, 2026 |
| Days to expiry | 32 |
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: 28,053; Change as a share of the earlier figure: 0.0606
- Contracts traded behind each figure
- Open interest changed: 114
- Baseline
- median absolute open interest change share, contracts 1 to 3 months out: 0.0233
- 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 19, 2026
All SPY snapshots on the hub- SPYPOCT 30Put/call by expiry
SPY puts expiring Oct 30 (2 weeks out) traded 7.0x the calls, vs a 1.1x median
The median is SPY's put/call volume ratio for contracts 1 to 3 weeks out over the last 7 sessions. 159,948 put and 22,769 call contracts by 11:32 ET on Oct 19, 2026. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYC771OCT 20Volume vs open interest
SPY 771 calls expiring Oct 20 traded 5.8x their open interest
SPY calls expiring that date in the strikes we track traded 0.4x their open interest, by 09:37 ET on Oct 19, 2026. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYCOCT 20Put/call by expiry
SPY calls outnumbered puts 1.9 to 1 expiring Oct 20, vs a 0.8 median
The median is SPY's call/put volume ratio for contracts within a week over the last 7 sessions. 27,632 call and 14,860 put contracts by 09:37 ET on Oct 19, 2026. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYCOCT 22Put/call by expiry
SPY calls outnumbered puts 2.3 to 1 expiring Oct 22, vs a 0.8 median
The median is SPY's call/put volume ratio for contracts within a week over the last 7 sessions. 3,868 call and 1,681 put contracts by 09:37 ET on Oct 19, 2026. Tracked: up to 40 strikes around the money across 33 expirations.
- SPYCOCT 30Put/call by expiry
SPY calls outnumbered puts 3.9 to 1 expiring Oct 30 (2 weeks out), vs a 0.9 median
The median is SPY's call/put volume ratio for contracts 1 to 3 weeks out over the last 7 sessions. 3,366 call and 870 put contracts by 09:32 ET on Oct 19, 2026. Tracked: up to 40 strikes around the money across 33 expirations.