SPX · CALLS · OCT 22Settled

Open interest in SPX calls expiring Oct 22 rose 87,074 at the Oct 21 settlement

As of Oct 21, 2026 settlement. Source: Cboe settlement open interest archive.

On the page at squawkflow.com/options-flow/2026-10-21/spx-calls-oct-22-2026-open-interest-change: the evidence table and the rule this settlement figure passed; and up to six other SPX snapshots from Oct 21, 2026.

55,889 to 142,963 contracts between the Oct 20 and Oct 21 settlements, 156% of the prior figure.

Evidence

The numbers behind this snapshot, Oct 21, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.
Measure	Value
Open interest, earlier settlement	55,889
Open interest, later settlement	142,963
Change (contracts)	+87,074
Change as a share of the earlier figure	156%
Earlier settlement	Oct 20, 2026
Later settlement	Oct 21, 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: 87,074; Change as a share of the earlier figure: 1.558
Contracts traded behind each figure: Open interest changed: 113
Baseline: median absolute open interest change share, contracts within a week: 0.1865
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 22Open interest change
Settled
Open interest in SPX puts expiring Oct 22 rose 126,840 at the Oct 21 settlement
106,128 to 232,968 contracts between the Oct 20 and Oct 21 settlements, 120% of the prior figure.
Source: Cboe settlement open interest archiveDetails