OITracker Cboe delayed data

Contract OI history

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Nov 20, 2026 EXPIRATION

B $39.50 Put

B261120P00039500

Latest saved OI25Oct 23, 2026
Last change+20vs previous saved observation
Saved market days2Oct 21, 2026 onwards
Daily open interest Hover a point for its date and OI
B $39.50 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. 25120 2026-10-21: 5 OI2026-10-23: 25 OI Oct 21, 2026Oct 23, 2026

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

B contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing25+20
Oct 21, 20265No prior observation