SPX · CALLS · OCT 19Settled

Open interest in SPX calls expiring Oct 19 rose 82,511 at the Oct 16 settlement

As of Oct 16, 2026 settlement. Source: Cboe settlement open interest archive.

On the page at squawkflow.com/options-flow/2026-10-16/spx-calls-oct-19-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other SPX snapshots from Oct 16, 2026.

57,810 to 140,321 contracts between the Oct 15 and Oct 16 settlements, 143% of the prior figure.

Evidence

The numbers behind this snapshot, Oct 16, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.
Measure	Value
Open interest, earlier settlement	57,810
Open interest, later settlement	140,321
Change (contracts)	+82,511
Change as a share of the earlier figure	143%
Earlier settlement	Oct 15, 2026
Later settlement	Oct 16, 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: 82,511; Change as a share of the earlier figure: 1.4273
Contracts traded behind each figure: Open interest changed: 142
Baseline: median absolute open interest change share, contracts within a week: 0.1969
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 19Open interest change
Settled
Open interest in SPX puts expiring Oct 19 rose 227,184 at the Oct 16 settlement
102,163 to 329,347 contracts between the Oct 15 and Oct 16 settlements, 222% of the prior figure.
Source: Cboe settlement open interest archiveDetails