Unusual options activity / Oct 8, 2026 SPX · CALLS · DEC 4
Open interest in SPX calls expiring Dec 4 rose 4,867 at the Oct 8 settlement As of Oct 8, 2026 settlement . Source: Cboe settlement open interest archive.
4,547 to 9,414 contracts between the Oct 7 and Oct 8 settlements, 107% of the prior figure.
Evidence The numbers behind this snapshot, Oct 8, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed. Measure Value Open interest, earlier settlement 4,547 Open interest, later settlement 9,414 Change (contracts) +4,867 Change as a share of the earlier figure 107% Earlier settlement Oct 7, 2026 Later settlement Oct 8, 2026 Days to expiry 57
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: 4,867; Change as a share of the earlier figure: 1.0704
Contracts traded behind each figure Open interest changed: 35
Baseline median absolute open interest change share, contracts 1 to 3 months out: 0.0525
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.
Share this snapshot
Embed as an image Embed code Open interest change, not trades; it does not say which side opened or closed.
Open interest change, 1 to 3 months, calls. Templated sentence, grammar g4.
Send feedback
SPX C OCT 9 Open interest change
Settled 169,043 to 256,248 contracts between the Oct 7 and Oct 8 settlements, 52% of the prior figure.
Before 169,043
After 256,248
SPX P JUN 17 '27 Put/call by expiry
15:57 ET 5,167 put and 1,931 call contracts by 15:57 ET on Oct 8, 2026. Est. premium $161.6M puts, $99.3M calls. Tracked: up to 40 strikes around the money across 55 expirations.
C Calls1,931
P Puts5,167
contracts SPX P 7,760 OCT 9 Volume vs open interest
15:57 ET SPX puts expiring that date in the strikes we track traded 2.5x their open interest, by 15:57 ET on Oct 8, 2026. Tracked: up to 40 strikes around the money across 55 expirations.
Every snapshot, Oct 8, 2026 Open interest changes Latest session