SPX · CALLS · OCT 12Settled

Open interest in SPX calls expiring Oct 12 rose 66,832 at the Oct 9 settlement

As of Oct 9, 2026 settlement. Source: Cboe settlement open interest archive.

86,744 to 153,576 contracts between the Oct 8 and Oct 9 settlements, 77% of the prior figure.

Evidence

The numbers behind this snapshot, Oct 9, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.
Measure	Value
Open interest, earlier settlement	86,744
Open interest, later settlement	153,576
Change (contracts)	+66,832
Change as a share of the earlier figure	77%
Earlier settlement	Oct 8, 2026
Later settlement	Oct 9, 2026
Days to expiry	3

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: 66,832; Change as a share of the earlier figure: 0.7705
Contracts traded behind each figure: Open interest changed: 137
Baseline: median absolute open interest change share, contracts within a week: 0.2211
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 12Open interest change
Settled
Open interest in SPX puts expiring Oct 12 rose 123,332 at the Oct 9 settlement
115,138 to 238,470 contracts between the Oct 8 and Oct 9 settlements, 107% of the prior figure.
Source: Cboe settlement open interest archiveDetails