OITracker Cboe delayed data

Contract OI history

Back to B

Nov 20, 2026 EXPIRATION

B $40.50 Put

B261120P00040500

Latest saved OI127Oct 23, 2026
Last change+36vs previous saved observation
Saved market days2Oct 21, 2026 onwards
Daily open interest Hover a point for its date and OI
B $40.50 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. 127630 2026-10-21: 91 OI2026-10-23: 127 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, 2026Viewing127+36
Oct 21, 202691No prior observation