SPX · CALLS · OCT 9Settled

Open interest in SPX calls expiring Oct 9 rose 87,205 at the Oct 8 settlement

As of Oct 8, 2026 settlement. Source: Cboe settlement open interest archive.

169,043 to 256,248 contracts between the Oct 7 and Oct 8 settlements, 52% 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	169,043
Open interest, later settlement	256,248
Change (contracts)	+87,205
Change as a share of the earlier figure	52%
Earlier settlement	Oct 7, 2026
Later settlement	Oct 8, 2026
Days to expiry	1

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: 87,205; Change as a share of the earlier figure: 0.5159
Contracts traded behind each figure: Open interest changed: 155
Baseline: median absolute open interest change share, contracts within a week: 0.2169
Baseline window: last 20 sessions
Baseline n: 19
Claim level: 0, a reported fact

This snapshot is itself a settlement figure, so it has no follow-up of its own.

SPXCDEC 4Open interest change
Settled
Open interest in SPX calls expiring Dec 4 rose 4,867 at the Oct 8 settlement
4,547 to 9,414 contracts between the Oct 7 and Oct 8 settlements, 107% of the prior figure.
Source: Cboe settlement open interest archiveDetails
SPXPJUN 17 '27Put/call by expiry
15:57 ET
SPX puts expiring Jun 17, 2027 traded 2.7x the calls on that date
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.
Source: Schwab options chainDetails
SPXP7,760OCT 9Volume vs open interest
15:57 ET
SPX 7760 puts expiring Oct 9 traded 7.6x their open interest
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.
Source: Schwab options chainDetails