OITracker Cboe delayed data

Contract OI history

Back to B

Oct 23, 2026 EXPIRATION

B $39.50 Put

B261023P00039500

Latest saved OI353Oct 23, 2026
Last change-6vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
B $39.50 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 3591790 2026-10-02: 0 OI2026-10-05: 1 OI2026-10-06: 1 OI2026-10-07: 3 OI2026-10-08: 5 OI2026-10-09: 6 OI2026-10-13: 14 OI2026-10-14: 16 OI2026-10-15: 28 OI2026-10-16: 59 OI2026-10-21: 359 OI2026-10-23: 353 OI Oct 02, 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, 2026Viewing353-6
Oct 21, 2026359+300
Oct 16, 202659+31
Oct 15, 202628+12
Oct 14, 202616+2
Oct 13, 202614+8
Oct 09, 20266+1
Oct 08, 20265+2
Oct 07, 20263+2
Oct 06, 202610
Oct 05, 20261+1
Oct 02, 20260No prior observation