SPX · CALLS · OCT 13Settled

Open interest in SPX calls expiring Oct 13 rose 47,028 at the Oct 12 settlement

As of Oct 12, 2026 settlement. Source: Cboe settlement open interest archive.

60,098 to 107,126 contracts between the Oct 9 and Oct 12 settlements, 78% of the prior figure.

Evidence

The numbers behind this snapshot, Oct 12, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.
Measure	Value
Open interest, earlier settlement	60,098
Open interest, later settlement	107,126
Change (contracts)	+47,028
Change as a share of the earlier figure	78%
Earlier settlement	Oct 9, 2026
Later settlement	Oct 12, 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: 47,028; Change as a share of the earlier figure: 0.7825
Contracts traded behind each figure: Open interest changed: 136
Baseline: median absolute open interest change share, contracts within a week: 0.2262
Baseline window: last 20 sessions
Baseline n: 20
Claim level: 0, a reported fact

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

SPXPOCT 13Open interest change
Settled
Open interest in SPX puts expiring Oct 13 rose 75,387 at the Oct 12 settlement
125,037 to 200,424 contracts between the Oct 9 and Oct 12 settlements, 60% of the prior figure.
Source: Cboe settlement open interest archiveDetails