OITracker Cboe delayed data

Contract OI history

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May 21, 2027 EXPIRATION

CAT $400.00 Put

CAT270521P00400000

Latest saved OI51Oct 23, 2026
Last change+51vs previous saved observation
Saved market days2Oct 21, 2026 onwards
Daily open interest Hover a point for its date and OI
CAT $400.00 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. 51250 2026-10-21: 0 OI2026-10-23: 51 OI Oct 21, 2026Oct 23, 2026

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

CAT contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing51+51
Oct 21, 20260No prior observation