SPX · CALLS · OCT 20Settled

Open interest in SPX calls expiring Oct 20 rose 88,901 at the Oct 19 settlement

As of Oct 19, 2026 settlement. Source: Cboe settlement open interest archive.

On the page at squawkflow.com/options-flow/2026-10-19/spx-calls-oct-20-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other SPX snapshots from Oct 19, 2026.

57,574 to 146,475 contracts between the Oct 16 and Oct 19 settlements, 154% of the prior figure.

Evidence

The numbers behind this snapshot, Oct 19, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.
Measure	Value
Open interest, earlier settlement	57,574
Open interest, later settlement	146,475
Change (contracts)	+88,901
Change as a share of the earlier figure	154%
Earlier settlement	Oct 16, 2026
Later settlement	Oct 19, 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: 88,901; Change as a share of the earlier figure: 1.5441
Contracts traded behind each figure: Open interest changed: 133
Baseline: median absolute open interest change share, contracts within a week: 0.2097
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.

SPXCNOV 2Open interest change
Settled
Open interest in SPX calls expiring Nov 2 (2 weeks out) rose 16,754 at the Oct 19 settlement
14,767 to 31,521 contracts between the Oct 16 and Oct 19 settlements, 113% of the prior figure.
Source: Cboe settlement open interest archiveDetails