OITracker Cboe delayed data

Contract OI history

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Nov 20, 2026 EXPIRATION

S $21.50 Put

S261120P00021500

Latest saved OI15Oct 23, 2026
Last change+1vs previous saved observation
Saved market days2Oct 21, 2026 onwards
Daily open interest Hover a point for its date and OI
S $21.50 put open interest history 2 saved observations from 2026-10-21 to 2026-10-23. Exact values and changes are listed in the table below. 1570 2026-10-21: 14 OI2026-10-23: 15 OI Oct 21, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

S contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing15+1
Oct 21, 202614No prior observation