SPX · PUTS · NOV 27Settled

Open interest in SPX puts expiring Nov 27 rose 123,502 at the Oct 13 settlement

As of Oct 13, 2026 settlement. Source: Cboe settlement open interest archive.

23,277 to 146,779 contracts between the Oct 12 and Oct 13 settlements, 531% of the prior figure.

Evidence

The numbers behind this snapshot, Oct 13, 2026 settlement. Open interest change, not trades; it does not say which side opened or closed.
Measure	Value
Open interest, earlier settlement	23,277
Open interest, later settlement	146,779
Change (contracts)	+123,502
Change as a share of the earlier figure	531%
Earlier settlement	Oct 12, 2026
Later settlement	Oct 13, 2026
Days to expiry	45

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: 123,502; Change as a share of the earlier figure: 5.3058
Contracts traded behind each figure: Open interest changed: 104
Baseline: median absolute open interest change share, contracts 1 to 3 months out: 0.0542
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 14Open interest change
Settled
Open interest in SPX puts expiring Oct 14 rose 116,872 at the Oct 13 settlement
111,457 to 228,329 contracts between the Oct 12 and Oct 13 settlements, 105% of the prior figure.
Source: Cboe settlement open interest archiveDetails